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Ruan W, Galvan NTN, Dike P, Koci M, Faraone M, Fuller K, Koomaraie S, Cerminara D, Fishman DS, Deray KV, Munoz F, Schackman J, Leung D, Akcan-Arikan A, Virk M, Lam FW, Chau A, Desai MS, Hernandez JA, Goss JA. In Brief. Curr Probl Surg 2023; 60:101384. [PMID: 37993239 DOI: 10.1016/j.cpsurg.2023.101384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Affiliation(s)
- Wenly Ruan
- Department of Pediatrics, Baylor College of Medicine, Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, TX
| | - Nhu Thao N Galvan
- Department of Pediatric Surgery, Texas Children's Hospital, Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX.
| | - Peace Dike
- Department of Pediatrics, Baylor College of Medicine, Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, TX
| | - Melissa Koci
- Department of Pediatric Surgery, Texas Children's Hospital, Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX
| | - Marielle Faraone
- Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Kelby Fuller
- Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | | | - Dana Cerminara
- Department of Pharmacy, Texas Children's Hospital, Houston, TX
| | - Douglas S Fishman
- Department of Pediatrics, Baylor College of Medicine, Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, TX
| | - Kristen Valencia Deray
- Department of Pediatrics, Baylor College of Medicine, Department of Pharmacy, Texas Children's Hospital, Houston, TX
| | - Flor Munoz
- Department of Pediatrics, Baylor College of Medicine, Department of Pharmacy, Texas Children's Hospital, Houston, TX
| | - Julie Schackman
- Department of Anesthesiology, Baylor College of Medicine, Division of Anesthesiology, Perioperative, & Pain Medicine, Texas Children's Hospital, Houston, TX
| | - Daniel Leung
- Department of Pediatrics, Baylor College of Medicine, Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, TX
| | - Ayse Akcan-Arikan
- Department of Pediatrics, Baylor College of Medicine, Division of Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, TX
| | - Manpreet Virk
- Department of Pediatrics, Baylor College of Medicine, Division of Critical Care, Texas Children's Hospital, Houston, TX
| | - Fong W Lam
- Department of Pediatrics, Baylor College of Medicine, Division of Critical Care, Texas Children's Hospital, Houston, TX
| | - Alex Chau
- Department of Radiology, Edward B. Singleton Department of Radiology, Baylor College of Medicine, Division of Interventional Radiology, Texas Children's Hospital, Houston, TX
| | - Moreshwar S Desai
- Department of Pediatrics, Baylor College of Medicine, Division of Critical Care, Texas Children's Hospital, Houston, TX
| | - Jose A Hernandez
- Department of Radiology, Edward B. Singleton Department of Radiology, Baylor College of Medicine, Division of Interventional Radiology, Texas Children's Hospital, Houston, TX
| | - John A Goss
- Department of Pediatric Surgery, Texas Children's Hospital, Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, TX
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Ruan W, Galvan NTN, Dike P, Koci M, Faraone M, Fuller K, Koomaraie S, Cerminara D, Fishman DS, Deray KV, Munoz F, Schackman J, Leung D, Akcan-Arikan A, Virk M, Lam FW, Chau A, Desai MS, Hernandez JA, Goss JA. The Multidisciplinary Pediatric Liver Transplant. Curr Probl Surg 2023; 60:101377. [PMID: 37993242 DOI: 10.1016/j.cpsurg.2023.101377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 08/29/2023] [Indexed: 11/24/2023]
Affiliation(s)
- Wenly Ruan
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Nhu Thao N Galvan
- Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Department of Pediatric Surgery, Texas Children's Hospital, Baylor College of Medicine, Houston, TX.
| | - Peace Dike
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Melissa Koci
- Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Department of Pediatric Surgery, Texas Children's Hospital, Baylor College of Medicine, Houston, TX
| | - Marielle Faraone
- Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Kelby Fuller
- Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | | | - Dana Cerminara
- Department of Pharmacy, Texas Children's Hospital, Houston, TX
| | - Douglas S Fishman
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Kristen Valencia Deray
- Department of Pediatrics, Department of Pharmacy, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Flor Munoz
- Department of Pediatrics, Department of Pharmacy, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Julie Schackman
- Division of Anesthesiology, Perioperative, & Pain Medicine, Department of Anesthesiology, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Daniel Leung
- Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Ayse Akcan-Arikan
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Manpreet Virk
- Division of Critical Care, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Fong W Lam
- Division of Critical Care, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Alex Chau
- Division of Interventional Radiology, Department of Radiology, Edward B. Singleton Department of Radiology, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Moreshwar S Desai
- Division of Critical Care, Department of Pediatrics, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - Jose A Hernandez
- Division of Interventional Radiology, Department of Radiology, Edward B. Singleton Department of Radiology, Baylor College of Medicine, Texas Children's Hospital, Houston, TX
| | - John A Goss
- Division of Abdominal Transplantation, Michael E. DeBakey Department of Surgery, Department of Pediatric Surgery, Texas Children's Hospital, Baylor College of Medicine, Houston, TX
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Cleveland H, Pezeshkmehr A, Hernandez JA. Mechanical Thrombectomy via Common Carotid Artery Access in a Neonate with Aortoiliac Occlusion Syndrome. J Vasc Interv Radiol 2022; 33:1620-1622. [PMID: 36089200 DOI: 10.1016/j.jvir.2022.09.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 08/06/2022] [Accepted: 09/01/2022] [Indexed: 11/26/2022] Open
Affiliation(s)
- Heather Cleveland
- Department of Interventional Radiology, Children's Hospital New Orleans, New Orleans, LA; Department of Radiology, Tulane University School of Medicine, New Orleans, LA
| | - Amir Pezeshkmehr
- Department of Interventional Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX; Department of Radiology, Baylor College of Medicine, Houston, TX
| | - Jose A Hernandez
- Department of Interventional Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX; Department of Radiology, Baylor College of Medicine, Houston, TX.
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4
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Solís-Marcial OJ, Nájera-Bastida A, Talavera-López A, Serrano Rosales B, Hernandez JA, Zarate-Gutiérrez R. Thermodynamic Study of Leaching Conditions of Galena with Citrate Ions and Hydrogen Peroxide as Oxidizing Agent. Materials (Basel) 2022; 15:7704. [PMID: 36363296 PMCID: PMC9658878 DOI: 10.3390/ma15217704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/19/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
Galena is the most important mineral for lead production, as it is the main source of lead in the world. Currently, the concentrates of this mineral are mainly treated using pyrometallurgical methods, creating several environmental problems, such as the generation of toxic and greenhouse gases. In addition, these processes involve high energy consumption, which limits their applicability. Hydrometallurgical routes are proposed as alternative processes for obtaining some metals such as silver, copper, gold, etc. The drawback of these processes is that the minerals tend to be passive in aqueous media. To mitigate this issue, researchers have used extreme conditions of pressure and temperature (6 atm. and 155 °C) or the use of very corrosive conditions. In this sense, the use of complexing agents that dissolve the metals of interest has been proposed. Citrate ion is one of the most promising complexing agents for galena leaching, obtaining high percentages of dissolution in relatively short times. Unfortunately, there has not been enough investigation about the concentration optimization of the complexing in the pH range from 5 to 9. In this sense, thermodynamic diagrams, such as the Pourbaix diagrams, are very useful for this purpose. Therefore, in this work, the effects of pH and temperature on the leaching of galena in citrate ion solutions are studied thermodynamically and experimentally. The experimental work was carried out with pure galena samples with a particle size of +149 - 74 µm (-100 + 200 mesh). The results show that higher recoveries were obtained working at a pH of 8 and at temperatures of 30 and 40 °C. The thermodynamic and experimental data demonstrated that the existence of an optimal concentration of citrate ion, due the extraction of lead from galena, has a greater reaction rate at a relatively low initial concentration of 0.3 M. This is due the formation of the complex lead citrate 1 (Pb(cit)-).
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Affiliation(s)
- O. J. Solís-Marcial
- Instituto Politécnico Nacional-UPIIZ, Ingeniería Metalúrgica, Blvd. del Bote 202, Cerro del Gato, Zacatecas 98160, Mexico
| | - A. Nájera-Bastida
- Instituto Politécnico Nacional-UPIIZ, Ingeniería Metalúrgica, Blvd. del Bote 202, Cerro del Gato, Zacatecas 98160, Mexico
| | - Alfonso Talavera-López
- Unidad Académica de Ciencias Químicas, Universidad de Zacatecas, Campus UAZ Siglo XXI, Zacatecas 98160, Mexico
| | - Benito Serrano Rosales
- Unidad Académica de Ciencias Químicas, Universidad de Zacatecas, Campus UAZ Siglo XXI, Zacatecas 98160, Mexico
| | | | - R. Zarate-Gutiérrez
- Instituto Politécnico Nacional-CeCyT-18, Blvd. del Bote 202, Cerro del Gato, Zacatecas 98160, Mexico
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Wesson DE, Johnson BL, Barclay C, Vogel AM, Chelius DC, Dimachkieh AL, Athanassaki ID, Karaviti LP, Sher AC, Hernandez JA, Mahmood NF, Mahajan P, Quintanilla N, Lopez ME. Thyroid surgery outcomes at a children's hospital: The value of a multidisciplinary team approach. J Pediatr Surg 2022; 57:622-629. [PMID: 34301414 DOI: 10.1016/j.jpedsurg.2021.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/24/2021] [Accepted: 06/29/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND Our purpose is to describe the structure, function and outcomes of our multidisciplinary pediatric thyroid program and to evaluate our experience in comparison to other high-volume centers. METHODS We reviewed all thyroid operations performed 10/2012 through 09/2019, and examined number of cases per year, patient demographics, procedures, final diagnoses and results. Primary outcomes were hypoparathyroidism and recurrent laryngeal nerve (RLN) injury at 12 months. Data were analyzed using descriptive statistics and univariate analyses. RESULTS We performed 294 thyroid operations on 279 patients. Seventy-nine percent were female. Median age was 15 years (IQR: 12-17). Operations included total thyroidectomy (65%), lobectomy (30%) and completion thyroidectomy (5%). Most common diagnoses were Graves' disease (35%), malignancy (29%), and benign nodule (20%). We developed an evidence-based clinical pathway and conducted weekly multidisciplinary meetings. A clinical data specialist reviewed process and outcome measures routinely. Overall, 6 patients (2.0%) had hypoparathyroidism and 2 (0.7%) had unilateral RLN injury at 12 months. Two of the patients with clinical suspicion of permanent hypoparathyroidism were ultimately weaned off calcium. Both patients with RLN injury had extensive locally advanced malignant disease involving the nerve. CONCLUSIONS Our multidisciplinary team achieved excellent long-term outcomes for pediatric thyroid surgery comparable to other high-volume pediatric and adult centers.
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Affiliation(s)
- David E Wesson
- Division of Pediatric Surgery, Department of Surgery, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin Street, Suite 1210, Houston, TX 77030, United States
| | - Brittany L Johnson
- Division of Pediatric Surgery, Department of Surgery, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin Street, Suite 1210, Houston, TX 77030, United States
| | - Charlene Barclay
- Outcomes and Impact Service, Texas Children's Hospital, Houston, TX, United States
| | - Adam M Vogel
- Division of Pediatric Surgery, Department of Surgery, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin Street, Suite 1210, Houston, TX 77030, United States
| | - Daniel C Chelius
- Division of Pediatric Otolaryngology, Department of Surgery, Texas Children's Hospital, Houston, TX, United States
| | - Amy L Dimachkieh
- Division of Pediatric Otolaryngology, Department of Surgery, Texas Children's Hospital, Houston, TX, United States
| | - Ioanna D Athanassaki
- Division of Pediatric Endocrinology, Department of Pediatrics, Texas Children's Hospital, Houston, TX, United States
| | - Lefkothea P Karaviti
- Division of Pediatric Endocrinology, Department of Pediatrics, Texas Children's Hospital, Houston, TX, United States
| | - Andrew C Sher
- Department of Radiology, Texas Children's Hospital, Houston, TX, United States
| | - Jose A Hernandez
- Department of Radiology, Texas Children's Hospital, Houston, TX, United States
| | - Nadia F Mahmood
- Department of Radiology, Texas Children's Hospital, Houston, TX, United States
| | - Priya Mahajan
- Division of Pediatric Oncology, Department of Pediatrics, Texas Children's Hospital, Houston, TX, United States
| | - Norma Quintanilla
- Department of Pathology, Texas Children's Hospital, Houston, TX, United States
| | - Monica E Lopez
- Division of Pediatric Surgery, Department of Surgery, Baylor College of Medicine, Texas Children's Hospital, 6701 Fannin Street, Suite 1210, Houston, TX 77030, United States.
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Hernandez JA, Miller J, Oleck NC, Porras-Fimbres D, Wainright J, Laurie K, Booker SE, Testa G, Israni AK, Cendales LC. OPTN/SRTR 2020 Annual Data Report: VCA. Am J Transplant 2022; 22 Suppl 2:623-647. [PMID: 35266614 DOI: 10.1111/ajt.16980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The first vascularized composite allograft (VCA) transplant in the United States was performed in 1998 in a 40-year-old man who received a laryn-geal transplant after experiencing severe trauma to the throat 20 years before. The following VCA was a hand transplant in 1999 in a 37-year-old man who lost his left hand 13 years before. Since then, the field of VCA transplantation has made significant strides. On July 3, 2014, the Or gan Procurement and Transplantation Network (OPTN)/United Network for Organ Sharing (UNOS) oversight of VCA procurement and transplant in the United States went into effect. In the last decade, the number of candidates listed for and transplanted with VCA has increased. While patient demographic data, whether listed candidates or patients undergoing VCA transplant, is limited by sample size, the trend is a predominance toward a young/middle-aged, White population. Overall outcomes data have been promising, with the vast majority of VCA transplants resulting in functioning grafts.
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Affiliation(s)
- J A Hernandez
- Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - J Miller
- Scientific Registry of Transplant Recipients, Hennepin Healthcare Resear ch Institute, Minneapolis, MN
| | - N C Oleck
- Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - D Porras-Fimbres
- Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - J Wainright
- Organ Procurement and Transplantation Network, United Network for Organ Sharing, Richmond, VA
| | - K Laurie
- Organ Procurement and Transplantation Network, United Network for Organ Sharing, Richmond, VA
| | - S E Booker
- Organ Procurement and Transplantation Network, United Network for Organ Sharing, Richmond, VA
| | - G Testa
- Baylor University Medical Center, Dallas, TX
| | - A K Israni
- Scientific Registry of Transplant Recipients, Hennepin Healthcare Resear ch Institute, Minneapolis, MN
| | - L C Cendales
- Department of Surgery, Duke University Medical Center, Durham, North Carolina
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St Aubin CR, Fisher AL, Hernandez JA, Broderick TL, Al-Nakkash L. Mitigation of MAFLD in High Fat-High Sucrose-Fructose Fed Mice by a Combination of Genistein Consumption and Exercise Training. Diabetes Metab Syndr Obes 2022; 15:2157-2172. [PMID: 35911503 PMCID: PMC9329575 DOI: 10.2147/dmso.s358256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 07/13/2022] [Indexed: 12/22/2022] Open
Abstract
PURPOSE Metabolic dysfunction-associated fatty liver disease (MAFLD) is fueled by escalations in both sedentary behavior and caloric intake and is noted in obese type 2 diabetic (T2DM) patients. This study aimed to examine the effects of exercise and the phytoestrogen genistein in mice fed a high fat (60% fat) high sugar (55% fructose with 45% sucrose), HFHS diet. METHODS Male C57BL/6J mice were assigned to five groups: HFHS, HFHS with genistein (600 mg/kg diet, HFHS+Gen), HFHS with moderate exercise (HFHS+Ex), and HFHS with combined genistein and moderate exercise (HFHS-Gen+Ex). Control lean mice were fed standard chow and water. Exercise consisted of 30-minute sessions of treadmill running five days/week for the 12-week study duration. Body weight was assessed weekly. Liver, kidney, fecal pellets and serum were extracted at the end of the study and maintained at -80°C. RESULTS After 12 weeks of treatment, mice in the HFHS group had the highest hepatic lipid content. Plasma levels of glucose, insulin, leptin, cholesterol, amylin, and total fat content were significantly elevated in HFHS mice compared to control mice. HFHS feeding increased protein expression of carnitine palmitoyltransferase 1b (CPT-1b isoform) in gastrocnemius, CPT1a, glucose transporter protein 2 (GLUT2), glucocorticoid receptor (GR), and fructose 1,6-bisphosphate 1 (FBP1) expression in liver. Exercise alone had minor effects on these metabolic abnormalities. Genistein alone resulted in improvements in body weight, fat content, amylin, insulin sensitivity, and liver histopathology, GR, FBP1, and acetyl-CoA carboxylase 1 (ACC1). Combination treatment resulted in additional metabolic improvements, including reductions in hepatic lipid content and lipid area, alanine transferase activity, CPT1b, and CPT1a. CONCLUSION Our results indicate that a HFHS diet is obesogenic, inducing metabolic perturbations consistent with T2DM and MAFLD. Genistein alone and genistein combined with moderate intensity exercise were effective in reducing MAFLD and the aberrations induced by chronic HFHS feeding.
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Affiliation(s)
- Chaheyla R St Aubin
- Department of Biomedical Sciences, College of Graduate Studies, Midwestern University, Glendale, AZ, 85308, USA
| | - Amy L Fisher
- Department of Biomedical Sciences, College of Graduate Studies, Midwestern University, Glendale, AZ, 85308, USA
| | - Jose A Hernandez
- Department of Biochemistry and Molecular Genetics, College of Graduate Studies, Midwestern University, Glendale, AZ, 85308, USA
| | - Tom L Broderick
- Department of Physiology, College of Graduate Studies Midwestern University, Glendale, AZ, 85308, USA
- Laboratory of Diabetes and Exercise Metabolism, College of Graduate Studies, Midwestern University, Glendale, AZ, 85308, USA
| | - Layla Al-Nakkash
- Department of Physiology, College of Graduate Studies Midwestern University, Glendale, AZ, 85308, USA
- Correspondence: Layla Al-Nakkash, Department of Physiology, College of Graduate Studies, Midwestern University, 19555 North 59th Avenue, Glendale, AZ, 85308, USA, Tel +1 623 572 3719, Fax +1 623 572 3673, Email
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8
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Phillips AH, Hernandez JA, Payá-Tormo L, Burén S, Cuevas-Zuviría B, Pacios LF, Pelton JG, Wemmer DE, Rubio LM. Environment and coordination of FeMo-co in the nitrogenase metallochaperone NafY. RSC Chem Biol 2021; 2:1462-1465. [PMID: 34704049 PMCID: PMC8496260 DOI: 10.1039/d1cb00086a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 07/27/2021] [Indexed: 11/30/2022] Open
Abstract
In nitrogenase biosynthesis, the iron-molybdenum cofactor (FeMo–co) is externally assembled at scaffold proteins and delivered to the NifDK nitrogenase component by the NafY metallochaperone. Here we have used nuclear magnetic resonance, molecular dynamics, and functional analysis to elucidate the environment and coordination of FeMo–co in NafY. H121 stands as the key FeMo–co ligand. Regions near FeMo–co diverge from H121 and include the η1, α1, α2 helical lobe and a narrow path between H121 and C196. Broadening of NMR resonance spins used to map binding of paramagnetic FeMo–co to the nitrogenase metallocluster escort protein NafY.![]()
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Affiliation(s)
| | - Jose A Hernandez
- Department of Biochemistry and Molecular Genetics, College of Graduate Studies, Midwestern University Glendale AZ 85308 USA.,Arizona College of Osteopathic Medicine, Midwestern University Glendale AZ 85308 USA
| | - Lucía Payá-Tormo
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Pozuelo de Alarcón Madrid 28223 Spain
| | - Stefan Burén
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Pozuelo de Alarcón Madrid 28223 Spain
| | - Bruno Cuevas-Zuviría
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Pozuelo de Alarcón Madrid 28223 Spain
| | - Luis F Pacios
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Pozuelo de Alarcón Madrid 28223 Spain
| | - Jeffrey G Pelton
- QB3 Institute, University of California Berkeley CA 94720 USA .,Division of Physical Biosciences of Lawrence Berkeley National Laboratory, University of California Berkeley CA 94720 USA
| | - David E Wemmer
- QB3 Institute, University of California Berkeley CA 94720 USA .,Division of Physical Biosciences of Lawrence Berkeley National Laboratory, University of California Berkeley CA 94720 USA.,Department of Chemistry, University of California Berkeley CA 94720 USA
| | - Luis M Rubio
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Pozuelo de Alarcón Madrid 28223 Spain
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9
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Petters LM, Vogel TP, Munoz FM, Hernandez JA, Koohmaraie S, Nowicki MJ, Zumbro CE, Mysore KR. Multisystem inflammatory syndrome in children associated with SARS-CoV-2 in a solid organ transplant recipient. Am J Transplant 2021; 21:2596-2599. [PMID: 33754452 PMCID: PMC8250508 DOI: 10.1111/ajt.16572] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 03/10/2021] [Accepted: 03/10/2021] [Indexed: 01/25/2023]
Abstract
We present the case of a 3-year-old female liver transplant recipient with a history of Caroli disease who presented with positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) reverse transcription polymerase chain reaction (RT-PCR) test and was ultimately diagnosed with multisystem inflammatory syndrome in children (MIS-C) complicated by portal vein thrombosis. To the best of our knowledge, this is the first case report of MIS-C in a pediatric solid organ transplant (SOT) recipient. Based on our patient, MIS-C could be a potential complication of Coronavirus disease 2019 (COVID-19) in SOT recipients and may have a negative outcome on transplant graft function.
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Affiliation(s)
- Leanne M. Petters
- Section of Infectious Diseases, Department of Pediatrics, Baylor College of Medicine, Houston, Texas,Texas Children’s Hospital, Houston, Texas,Correspondence Leanne M. Petters, Section of Infectious Diseases, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA.
| | - Tiphanie P. Vogel
- Texas Children’s Hospital, Houston, Texas,Section of Rheumatology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
| | - Flor M. Munoz
- Section of Infectious Diseases, Department of Pediatrics, Baylor College of Medicine, Houston, Texas,Texas Children’s Hospital, Houston, Texas
| | - Jose A. Hernandez
- Texas Children’s Hospital, Houston, Texas,Section of Pediatric Interventional Radiology, Department of Radiology, Baylor College of Medicine, Houston, Texas
| | | | - Michael J. Nowicki
- Department of Pediatrics, The University of Mississippi Medical Center, Jackson, Mississippi
| | - Caleb E. Zumbro
- Department of Pediatrics, The University of Mississippi Medical Center, Jackson, Mississippi,Department of Medicine, The University of Mississippi Medical Center, Jackson, Mississippi
| | - Krupa R. Mysore
- Texas Children’s Hospital, Houston, Texas,Section of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Baylor College of Medicine, Houston, Texas
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10
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Armstrong DG, Kaul I, Hernandez JA, Chumpitazi BP. Gastrojejunal Enteral Tube Serving as a Small Bowel Bezoar Nidus. Cureus 2021; 13:e15266. [PMID: 34221745 PMCID: PMC8237910 DOI: 10.7759/cureus.15266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Gastrojejunal (GJ) tube placement is indicated in the management of gastric feeding-related intolerance. Though uncommon, GJ complications may occur. We present the case of a five-year-old male with congenital heart disease in which image-guided replacement of a GJ tube was unable to be completed due to a mass adhered to the tip of the tube. The subsequent endoscopic evaluation identified the mass as a hair-based bezoar and the tube was successfully removed. The child was subsequently diagnosed with trichotillomania, trichophagia, and pica. This case illustrates the importance of recognizing bezoar formation as a potential complication of GJ enteric tubes, particularly in children with trichophagia and pica.
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Affiliation(s)
| | - Isha Kaul
- Department of Pediatrics, Section of Gastroenterology, Hepatology, and Nutrition, Baylor College of Medicine, Houston, USA.,Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, USA
| | - Jose A Hernandez
- Department of Radiology, Baylor College of Medicine, Houston, USA.,Division of Interventional Radiology, Texas Children's Hospital, Houston, USA
| | - Bruno P Chumpitazi
- Department of Pediatrics, Section of Gastroenterology, Hepatology, and Nutrition, Baylor College of Medicine, Houston, USA.,Division of Pediatric Gastroenterology, Hepatology, and Nutrition, Texas Children's Hospital, Houston, USA.,Department of Agriculture Research Service, Children's Nutrition Research Center, Houston, USA
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11
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Hernandez JA, Fonseca LF, Pettes MT, Jose-Yacaman M. Thermoelectric properties of antimony selenide hexagonal nanotubes. Nanotechnology 2021; 32:095705. [PMID: 33202386 DOI: 10.1088/1361-6528/abcb31] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Antimony selenide (Sb2Se3) is a material widely used in photodetectors and relatively new as a possible material for thermoelectric applications. Taking advantage of the new properties after nanoscale fabrication, this material shows great potential for the development of efficient low temperature thermoelectric devices. Here we study the synthesis, the crystal properties and the thermal and thermoelectric transport response of Sb2Se3 hexagonal nanotubes (HNT) in the temperature range between 120 and 370 K. HNT have a moderate electrical conductivity ∼102 S m-1 while maintaining a reasonable Seebeck coefficient ∼430 μV K-1 at 370 K. The electrical conductivity in Sb2Se3 HNT is about 5 orders of magnitude larger and its thermal conductivity one half of what is found in bulk. Moreover, the calculated figure of merit (ZT) at room temperature is the largest value reported in antimony selenide 1D structures.
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Affiliation(s)
- Jose A Hernandez
- Department of Physics-University of Puerto Rico-Rio Piedras Campus, San Juan PR 00931, United States of America
- Molecular Science Research Center-University of Puerto Rico, San Juan PR 00926, United States of America
| | - Luis F Fonseca
- Department of Physics-University of Puerto Rico-Rio Piedras Campus, San Juan PR 00931, United States of America
| | - Michael T Pettes
- Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, United States of America
| | - Miguel Jose-Yacaman
- Department of Applied Physics and Materials Science, Northern Arizona University, Flagstaff, AZ 86011, United States of America
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12
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Campagna GA, Cunningham ME, Hernandez JA, Chau A, Vogel AM, Naik-Mathuria BJ. The utility and promise of Resuscitative Endovascular Balloon Occlusion of the Aorta (REBOA) in the pediatric population: An evidence-based review. J Pediatr Surg 2020; 55:2128-2133. [PMID: 32061369 DOI: 10.1016/j.jpedsurg.2020.01.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 12/17/2019] [Accepted: 01/24/2020] [Indexed: 11/18/2022]
Abstract
Hemorrhage is the main cause of preventable death in both military and civilian trauma, and many of these patients die from non-compressible torso injuries. Resuscitative endovascular balloon occlusion of the aorta (REBOA) is a minimally invasive method used for hemodynamic control of the hemorrhaging patient and has been compared to resuscitative thoracotomy (RT) with cross clamping of the aorta. REBOA has received a great deal of attention in recent years for its applicability and promise in adult trauma and non-trauma settings, but its utility in children is mostly unknown. The purpose of this review article is to summarize and consolidate what is currently known about the use of REBOA in children. Some of the challenges in implementing REBOA in children include small vascular anatomy and lack of outcomes data. Although the evidence is limited, there are established instances in the literature of children and adolescents who have undergone endovascular occlusion of the aorta for hemorrhage control with positive outcomes and survival rates equivalent to their adult counterparts. There is a need for further formal evaluation of REBOA in pediatric patients with prospective studies to look at the safety, feasibility and efficacy of the technique. STUDY TYPE: Narrative Literature Review LEVEL OF EVIDENCE: IV.
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Affiliation(s)
- Giovanni A Campagna
- Baylor College of Medicine, School of Medicine, 1 Baylor Plaza, Houston, TX, 77030, USA
| | - Megan E Cunningham
- Texas Children's Hospital, Michael E. DeBakey Department of Surgery, Division of Pediatric Surgery, 6701 Fannin St, Houston, TX, 77030, USA
| | - Jose A Hernandez
- Texas Children's Hospital, Department of Radiology, Division of Pediatric Interventional Radiology, 6701 Fannin St, Houston, TX, 77030, USA
| | - Alex Chau
- Texas Children's Hospital, Department of Radiology, Division of Pediatric Interventional Radiology, 6701 Fannin St, Houston, TX, 77030, USA
| | - Adam M Vogel
- Texas Children's Hospital, Michael E. DeBakey Department of Surgery, Division of Pediatric Surgery, 6701 Fannin St, Houston, TX, 77030, USA
| | - Bindi J Naik-Mathuria
- Texas Children's Hospital, Michael E. DeBakey Department of Surgery, Division of Pediatric Surgery, 6701 Fannin St, Houston, TX, 77030, USA.
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13
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Stephanie S, Shum T, Cleveland H, Challa SR, Herring A, Jacobson FL, Hatabu H, Byrne SC, Shashi K, Araki T, Hernandez JA, White CS, Hossain R, Hunsaker AR, Hammer MM. Determinants of Chest X-Ray Sensitivity for COVID- 19: A Multi-Institutional Study in the United States. Radiol Cardiothorac Imaging 2020; 2:e200337. [PMID: 33778628 PMCID: PMC7605075 DOI: 10.1148/ryct.2020200337] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Purpose To evaluate the sensitivity, specificity, and severity of chest x-rays (CXR) and chest CTs over time in confirmed COVID-19+ and COVID-19- patients and to evaluate determinants of false negatives. Methods In a retrospective multi-institutional study, 254 RT-PCR verified COVID-19+ patients with at least one CXR or chest CT were compared with 254 age- and gender-matched COVID-19- controls. CXR severity, sensitivity, and specificity were determined with respect to time after onset of symptoms; sensitivity and specificity for chest CTs without time stratification. Performance of serial CXRs against CTs was determined by comparing area under the receiver operating characteristic curves (AUC). A multivariable logistic regression analysis was performed to assess factors related to false negative CXR. Results COVID-19+ CXR severity and sensitivity increased with time (from sensitivity of 55% at ≤2 days to 79% at >11 days; p<0.001 for trends of both severity and sensitivity) whereas CXR specificity decreased over time (from 83% to 70%, p=0.02). Serial CXR demonstrated increase in AUC (first CXR AUC=0.79, second CXR=0.87, p=0.02), and second CXR approached the accuracy of CT (AUC=0.92, p=0.11). COVID-19 sensitivity of first CXR, second CXR, and CT was 73%, 83%, and 88%, whereas specificity was 80%, 73%, and 77%, respectively. Normal and mild severity CXR findings were the largest factor behind false-negative CXRs (40% normal and 87% combined normal/mild). Young age and African-American ethnicity increased false negative rates. Conclusion CXR sensitivity in COVID-19 detection increases with time, and serial CXRs of COVID-19+ patients has accuracy approaching that of chest CT.
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Affiliation(s)
- Stephanie Stephanie
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Thomas Shum
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Heather Cleveland
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Suryanarayana R Challa
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Allison Herring
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Francine L Jacobson
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Hiroto Hatabu
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Suzanne C Byrne
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Kumar Shashi
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Tetsuro Araki
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Jose A Hernandez
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Charles S White
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Rydhwana Hossain
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Andetta R Hunsaker
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
| | - Mark M Hammer
- Department of Internal Medicine, University of Maryland School of Medicine, Midtown Campus, 827 Linden Avenue, Baltimore, MD 21201 (S.S., T.S., S.R.C.); Department of Physician Assistant Studies, Massachusetts General Hospital Institute of Health Professions, 55 Fruit St, Boston, MA 02114 (H.C.); Department of Radiology, University of Maryland School of Medicine, Downtown Campus, 22 S Greene St, Baltimore, MD 21201 (A.H., C.S.W., R.H.); Department of Pediatric Radiology, Texas Children's Hospital, 6621 Fannin St, Houston, TX 77030 (J.A.H.); and Department of Radiology, The Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02114 (F.L.J., H.H., S.C.B., K.S., T.A., A.R.H., M.M.H.)
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Hernandez JA, Carpena-Nunez J, Fonseca LF, Pettes MT, Yacaman MJ, Benitez A. Thermoelectric properties and thermal tolerance of indium tin oxide nanowires. Nanotechnology 2018; 29:364001. [PMID: 29901451 DOI: 10.1088/1361-6528/aaccd3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Highly crystalline indium tin oxide (ITO) nanowires were grown via a vapor-liquid-solid method, with thermal tolerance up to ∼1300 °C. We report the electric and thermoelectric properties of the ITO nanowires before and after heat treatments and draw conclusions about their applicability as thermoelectric building blocks in nanodevices that can operate in high temperature conditions. The Seebeck coefficient and the thermal and electrical conductivities were measured in each individual nanowire by means of specialized micro-bridge thermometry devices. Measured data was analyzed and explained in terms of changes in charge carrier density, impurities and vacancies due to the thermal treatments.
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Affiliation(s)
- Jose A Hernandez
- Department of Physics-University of Puerto Rico-Rio Piedras Campus, San Juan, PR 00931, United States of America
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15
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Lopez-Sanchez RDC, Lara-Diaz VJ, Aranda-Gutierrez A, Martinez-Cardona JA, Hernandez JA. HPLC Method for Quantification of Caffeine and Its Three Major Metabolites in Human Plasma Using Fetal Bovine Serum Matrix to Evaluate Prenatal Drug Exposure. J Anal Methods Chem 2018; 2018:2085059. [PMID: 30186659 PMCID: PMC6109507 DOI: 10.1155/2018/2085059] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 06/27/2018] [Indexed: 06/08/2023]
Abstract
Caffeine is recognized as the first-line therapeutic agent for apnea of prematurity. The dosage regimen is 10 mg/kg loading dose and 2.5 mg/kg maintenance dose. However, the plasma concentration achieved, not always, is therapeutically useful. It makes necessary to increase the doses to reach plasma concentration up to 30 or 35 μg/mL or even higher to attain therapeutic effect. To study why neonates have these differences, and whether these effects are linked to prenatal caffeine exposure, we had to develop an analytical method for an accurate measurement of caffeine and metabolites concentration. The analysis was carried out using fetal bovine serum (FBS) as biological matrix in a high-performance liquid chromatography with an ultraviolet detector method. This method allows acceptable chromatographic resolution between analytes in 15 minutes. It was validated and proved to be linear in the 0.1-40 µg/mL range for caffeine, paraxanthine, theobromine, and theophylline in the same chromatographic analysis. Accuracy for quality control samples for intra- and interday assays was ranged from 96.5 to 105.2% and 97.1 to 106.2%. Precision had CV no more than 10% in all concentration levels for all analytes. No differences were observed between quantification in human and FBS. This method was applied to quantify plasma drug concentration in mothers and their newborns in a Mexican northeast population. In our study, we confirmed self-reported caffeine maternal intake in 85.2% (n=23); meanwhile, in their newborn's plasma, it was detected only in 78% (n=21). Caffeine plasma concentrations in mother and newborn had a linear relationship, and no differences were observed between groups (mothers versus children). These results suggest that our analytical method and substitution of biological matrix was linear, precise, and accurate for caffeine quantification and could be used for measuring prenatal exposure and let us to study, in the future, concentration differences observed during apnea clinical treatment.
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Affiliation(s)
- Rosa del Carmen Lopez-Sanchez
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, 64710 Monterrey, NL, Mexico
| | - Victor Javier Lara-Diaz
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, 64710 Monterrey, NL, Mexico
| | - Alejandro Aranda-Gutierrez
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, 64710 Monterrey, NL, Mexico
| | - Jorge A. Martinez-Cardona
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, 64710 Monterrey, NL, Mexico
| | - Jose A. Hernandez
- Tecnologico de Monterrey, Escuela de Medicina y Ciencias de la Salud, Ave. Morones Prieto 3000, 64710 Monterrey, NL, Mexico
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Hernandez JA, Ruiz A, Fonseca LF, Pettes MT, Jose-Yacaman M, Benitez A. Thermoelectric properties of SnSe nanowires with different diameters. Sci Rep 2018; 8:11966. [PMID: 30097631 PMCID: PMC6086875 DOI: 10.1038/s41598-018-30450-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 07/26/2018] [Indexed: 11/26/2022] Open
Abstract
Tin selenide (SnSe) has been the subject of great attention in the last years due to its highly efficient thermoelectricity and its possibilities as a green material, free of Pb and Te. Here, we report for the first time a thermoelectricity and transport study of individual SnSe micro- and nano-wires with diameters in the range between 130 nm and 1.15 μm. X-ray diffraction and transmission electron microscopy analyses confirm an orthorhombic SnSe structure with Pnma (62) symmetry group and 1:1 Sn:Se atomic ratio. Electrical and thermal conductivity and the Seebeck coefficient were measured in each individual nanowire using a specialized suspended microdevice in the 150-370 K temperature range, yielding a thermal conductivity of 0.55 Wm-1 K-1 at room temperature and ZT ~ 0.156 at 370 K for the 130 nm diameter nanowire. The measured properties were correlated with electronic information obtained by model simulations and with phonon scattering analysis. The results confirm these structures as promising building blocks to develop efficient temperature sensors, refrigerators and thermoelectric energy converters. The thermoelectric response of the nanowires is compared with recent reports on crystalline, polycrystalline and layered bulk structures.
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Affiliation(s)
- Jose A Hernandez
- Department of Physics, University of Puerto Rico, Rio Piedras Campus, San Juan, PR, 00931, USA
| | - Angel Ruiz
- Department of Physics, University of Puerto Rico, Rio Piedras Campus, San Juan, PR, 00931, USA
| | - Luis F Fonseca
- Department of Physics, University of Puerto Rico, Rio Piedras Campus, San Juan, PR, 00931, USA.
| | - Michael T Pettes
- Department of Mechanical Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT, 06269-3139, USA
- Center for Integrated Nanotechnologies (CINT), Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
| | - Miguel Jose-Yacaman
- Department of Physics, University of Texas, San Antonio Campus, San Antonio, TX, 78249, USA
| | - Alfredo Benitez
- Department of Physics, University of Texas, San Antonio Campus, San Antonio, TX, 78249, USA
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Agrawal H, Moodie D, Qureshi AM, Acosta AA, Hernandez JA, Braun MC, Justino H. Interventions in children with renovascular hypertension: A 27-year retrospective single-center experience. CONGENIT HEART DIS 2018; 13:349-356. [DOI: 10.1111/chd.12608] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 03/16/2018] [Indexed: 12/01/2022]
Affiliation(s)
- Hitesh Agrawal
- Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Lillie Frank Abercrombie Section of Cardiology; Houston Texas
- Texas Children's Hospital and Baylor College of Medicine; C. E. Mullins Cardiac Catheterization Laboratories; Houston Texas
| | - Douglas Moodie
- Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Lillie Frank Abercrombie Section of Cardiology; Houston Texas
| | - Athar M. Qureshi
- Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Lillie Frank Abercrombie Section of Cardiology; Houston Texas
- Texas Children's Hospital and Baylor College of Medicine; C. E. Mullins Cardiac Catheterization Laboratories; Houston Texas
| | - Alisa A. Acosta
- Renal Section, Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Houston Texas
| | - Jose A. Hernandez
- Interventional Radiology Section, Pediatric Radiology, Texas Children's Hospital and Baylor College of Medicine; Houston Texas
| | - Michael C. Braun
- Renal Section, Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Houston Texas
| | - Henri Justino
- Department of Pediatrics, Texas Children's Hospital and Baylor College of Medicine; Lillie Frank Abercrombie Section of Cardiology; Houston Texas
- Texas Children's Hospital and Baylor College of Medicine; C. E. Mullins Cardiac Catheterization Laboratories; Houston Texas
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George SJ, Hernandez JA, Jimenez-Vicente E, Echavarri-Erasun C, Rubio LM. EXAFS reveals two Mo environments in the nitrogenase iron-molybdenum cofactor biosynthetic protein NifQ. Chem Commun (Camb) 2018; 52:11811-11814. [PMID: 27711309 DOI: 10.1039/c6cc06370e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Mo and Fe K-edge EXAFS analysis of NifQ shows the presence of a [MoFe3S4] cluster and a second independent Mo environment that includes Mo-O bonds and Mo-S bonds. Both environments are relevant to FeMo-co biosynthesis and may represent different stages of Mo biochemical transformations catalyzed by NifQ.
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Affiliation(s)
| | - Jose A Hernandez
- Department of Biochemistry, Midwestern University, Glendale, Arizona 85308, USA
| | - Emilio Jimenez-Vicente
- Centro de Biotecnología y Genómica de Plantas, Universidad Politénica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Campus Montegancedo UPM, 28223, Pozuelo de Alarcón, Madrid, Spain.
| | - Carlos Echavarri-Erasun
- Centro de Biotecnología y Genómica de Plantas, Universidad Politénica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Campus Montegancedo UPM, 28223, Pozuelo de Alarcón, Madrid, Spain.
| | - Luis M Rubio
- Centro de Biotecnología y Genómica de Plantas, Universidad Politénica de Madrid (UPM), Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Campus Montegancedo UPM, 28223, Pozuelo de Alarcón, Madrid, Spain.
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Quintana AM, Hernandez JA, Gonzalez CG. Functional analysis of the zebrafish ortholog of HMGCS1 reveals independent functions for cholesterol and isoprenoids in craniofacial development. PLoS One 2017; 12:e0180856. [PMID: 28686747 PMCID: PMC5501617 DOI: 10.1371/journal.pone.0180856] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 06/05/2017] [Indexed: 12/13/2022] Open
Abstract
There are 8 different human syndromes caused by mutations in the cholesterol synthesis pathway. A subset of these disorders such as Smith-Lemli-Opitz disorder, are associated with facial dysmorphia. However, the molecular and cellular mechanisms underlying such facial deficits are not fully understood, primarily because of the diverse functions associated with the cholesterol synthesis pathway. Recent evidence has demonstrated that mutation of the zebrafish ortholog of HMGCR results in orofacial clefts. Here we sought to expand upon these data, by deciphering the cholesterol dependent functions of the cholesterol synthesis pathway from the cholesterol independent functions. Moreover, we utilized loss of function analysis and pharmacological inhibition to determine the extent of sonic hedgehog (Shh) signaling in animals with aberrant cholesterol and/or isoprenoid synthesis. Our analysis confirmed that mutation of hmgcs1, which encodes the first enzyme in the cholesterol synthesis pathway, results in craniofacial abnormalities via defects in cranial neural crest cell differentiation. Furthermore targeted pharmacological inhibition of the cholesterol synthesis pathway revealed a novel function for isoprenoid synthesis during vertebrate craniofacial development. Mutation of hmgcs1 had no effect on Shh signaling at 2 and 3 days post fertilization (dpf), but did result in a decrease in the expression of gli1, a known Shh target gene, at 4 dpf, after morphological deficits in craniofacial development and chondrocyte differentiation were observed in hmgcs1 mutants. These data raise the possibility that deficiencies in cholesterol modulate chondrocyte differentiation by a combination of Shh independent and Shh dependent mechanisms. Moreover, our results describe a novel function for isoprenoids in facial development and collectively suggest that cholesterol regulates craniofacial development through versatile mechanisms.
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Affiliation(s)
- Anita M. Quintana
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
- Border Biomedical Research Center, NeuroModulation Cluster, University of Texas El Paso, El Paso, TX, United States of America
- * E-mail:
| | - Jose A. Hernandez
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
| | - Cesar G. Gonzalez
- Department of Biological Sciences, University of Texas El Paso, El Paso, TX, United States of America
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20
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Yang D, Hernandez JA, Katiyar RS, Fonseca LF. Surface morphology-controlled fabrication of Na2WO4 films with high structural stability. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.04.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Ballester LY, Sarabia SF, Sayeed H, Patel N, Baalwa J, Athanassaki I, Hernandez JA, Fang E, Quintanilla NM, Roy A, López-Terrada DH. Integrating Molecular Testing in the Diagnosis and Management of Children with Thyroid Lesions. Pediatr Dev Pathol 2016; 19:94-100. [PMID: 26366474 DOI: 10.2350/15-05-1638-oa.1] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Thyroid nodules occur in 1-2% of children, and identifying which nodules are malignant is often challenging. Cytologic evaluation facilitates the diagnosis of thyroid lesions (TLs), but in 10-40% of cases the interpretation is indeterminate. Patients with indeterminate diagnoses are often treated with hemithyroidectomy followed by completion thyroidectomy, if cancer is found in the initial specimen. Exposing patients to multiple surgeries increases costs and morbidity. The American Thyroid Association states that a combination of molecular markers is likely to optimize the management of patients with indeterminate cytology. However, few studies have addressed the molecular alterations present in pediatric TL. Twenty-seven thyroid carcinomas from patients 10 to 19 years of age were tested for alterations common in adult TL, including BRAF V600E mutation, RET fusions, and TERT promoter mutations. Mutation-negative cases were subsequently analyzed with a next-generation sequencing (NGS) mutation panel to search for additional targets. Histologic diagnoses included 12 classic papillary thyroid carcinomas (PTCs), 13 follicular variant PTCs, 1 medullary thyroid carcinoma, and 1 follicular carcinoma. Fourteen cases showed lymph node involvement, and 13 cases demonstrated lymphovascular invasion. The BRAF V600E mutation was detected in 10/27 cases, and RET fusions were detected in 6/27 cases. No TERT promoter mutations were identified in any of the cases. The NGS panel revealed additional RET and CTNNB1 pathogenic missense mutations. Our results demonstrate that molecular abnormalities are common in pediatric TLs and suggest that incorporation of molecular testing will be helpful in optimizing patient management.
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Affiliation(s)
- Leomar Y Ballester
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Stephen F Sarabia
- 2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Hadi Sayeed
- 2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Nimesh Patel
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Joshua Baalwa
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA.,3 Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Ioanna Athanassaki
- 4 Department of Pediatric Medicine, Texas Children's Hospital, Houston, TX, USA
| | - Jose A Hernandez
- 5 Department of Pediatric Radiology, Texas Children's Hospital, Houston, TX, USA
| | - Erica Fang
- 2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Norma M Quintanilla
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Angshumoy Roy
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
| | - Dolores H López-Terrada
- 1 Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX, USA.,2 Department of Pathology, Texas Children's Hospital, Houston, TX, USA
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22
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Ekiri AB, Long MT, Hernandez JA. Diagnostic performance and application of a real-time PCR assay for the detection of Salmonella in fecal samples collected from hospitalized horses with or without signs of gastrointestinal tract disease. Vet J 2015; 208:28-32. [PMID: 26797475 DOI: 10.1016/j.tvjl.2015.11.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 09/30/2015] [Accepted: 11/22/2015] [Indexed: 10/22/2022]
Abstract
The main objective of this study was to assess the diagnostic performance of a real-time polymerase chain reaction (PCR) assay for the detection of Salmonella in fecal samples collected from hospitalized horses with or without signs of gastrointestinal (GI) tract disease. The PCR assay used primers and a probe that targeted the invA gene of Salmonella. Assuming a sensitivity of 100% and a specificity of 96.6%, and a disease prevalence of 2%, 5%, and 10-15% in study horses, the PCR assay had a high (100%) negative predictive value, and a positive predictive value that ranged from 37% in horses without signs of GI disease that tested Salmonella culture-negative, to 60% in horses with signs of GI disease that tested Salmonella culture-negative, to 76-83% in horses with signs of GI disease that tested Salmonella culture-positive. This study provides evidence that the real-time PCR that targets the Salmonella invA gene can be used as a screening test for the detection of Salmonella in feces of hospitalized horses with signs of GI disease. Horses that test PCR-positive can be tested in series using bacteriologic culture to reduce false positive results or to provide additional data (e.g., antibiogram and serotyping data) that can be used to identify potential nosocomial Salmonella infections.
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Affiliation(s)
- A B Ekiri
- Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida, USA
| | - M T Long
- Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
| | - J A Hernandez
- Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida, USA.
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Ribeiro ELDA, Hernandez JA, Zanella EL, Shimokomaki M, Prudêncio-Ferreira SH, Youssef E, Ribeiro HJSS, Bogden R, Reeves JJ. Growth and carcass characteristics of pasture fed LHRH immunocastrated, castrated and intact Bos indicus bulls. Meat Sci 2012; 68:285-90. [PMID: 22062238 DOI: 10.1016/j.meatsci.2004.03.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Revised: 03/12/2004] [Accepted: 03/12/2004] [Indexed: 12/01/2022]
Abstract
The effectiveness of a luteinizing hormone-releasing hormone (LHRH) fusion protein vaccine or surgical castration, at two years of age, on growth and carcass characteristics of Bos indicus bulls was evaluated. Seventy Nelore-cross bulls were divided into three groups: (1) immunized, (2) castrated and (3) intact control. At slaughter (three years of age), intact bulls had higher body weights, ADG, carcass weights, and muscle percentage compared to immunized and surgically castrated animals. Both castrated and immunized animals had greater marbling and percent carcass fat than the intact bulls. Average tenderness scores were inferior for intact bulls compared to immunized and castrated animals, but these differences were not significant (P>0.05). Juiciness, flavor, thawing, nor cooking losses differed significantly among the three groups. Immunocastration was effective in producing carcass traits similar to that of surgical castration. Therefore, immunization with LHRH fusion proteins appears to have practical utility in the management and castration of grazing bulls.
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Affiliation(s)
- E L de A Ribeiro
- Departamento de Zootecnia/CCA, Londrina, Universidade Estadual de Londrina, Paraná, CEP 86051-990, Brazil
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24
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Faize M, Burgos L, Faize L, Piqueras A, Nicolas E, Barba-Espin G, Clemente-Moreno MJ, Alcobendas R, Artlip T, Hernandez JA. Involvement of cytosolic ascorbate peroxidase and Cu/Zn-superoxide dismutase for improved tolerance against drought stress. J Exp Bot 2011; 62:2599-613. [PMID: 21239380 DOI: 10.1093/jxb/erq432] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In order to understand the role of cytosolic antioxidant enzymes in drought stress protection, transgenic tobacco (Nicotiana tabacum cv. Xanthi) plants overexpressing cytosolic Cu/Zn-superoxide dismutase (cytsod) (EC 1.15.1.1) or ascorbate peroxidase (cytapx) (EC 1.11.1.1) alone, or in combination, were produced and tested for tolerance against mild water stress. The results showed that the simultaneous overexpression of Cu/Znsod and apx or at least apx in the cytosol of transgenic tobacco plants alleviates, to some extent, the damage produced by water stress conditions. This was correlated with higher water use efficiency and better photosynthetic rates. In general, oxidative stress parameters, such as lipid peroxidation, electrolyte leakage, and H(2)O(2) levels, were higher in non-transformed plants than in transgenic lines, suggesting that, at the least, overexpression of cytapx protects tobacco membranes from water stress. In these conditions, the activity of other antioxidant enzymes was induced in transgenic lines at the subcellular level. Moreover, an increase in the activity of some antioxidant enzymes was also observed in the chloroplast of transgenic plants overexpressing cytsod and/or cytapx. These results suggest the positive influence of cytosolic antioxidant metabolism on the chloroplast and underline the complexity of the regulation network of plant antioxidant defences during drought stress.
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Affiliation(s)
- M Faize
- Laboratory of Plant Biotechnology, Ecology and Ecosystem Valorisation, Faculty of Sciences, University Chouaib Doukkali, 24000 El Jadida, Morocco
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25
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Martínez-Noël G, Curatti L, Hernandez JA, Rubio LM. NifB and NifEN protein levels are regulated by ClpX2 under nitrogen fixation conditions in Azotobacter vinelandii. Mol Microbiol 2011; 79:1182-93. [PMID: 21231969 DOI: 10.1111/j.1365-2958.2011.07540.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The major part of biological nitrogen fixation is catalysed by the molybdenum nitrogenase that carries at its active site the iron and molybdenum cofactor (FeMo-co). The nitrogen fixation (nif) genes required for the biosynthesis of FeMo-co are derepressed in the absence of a source of fixed nitrogen. The nifB gene product is remarkable because it assembles NifB-co, a complex cluster proposed to comprise a [6Fe-9S-X] cluster, from simpler [Fe-S] clusters common to other metabolic pathways. NifB-co is a common intermediate of the biosyntheses of the cofactors present in the molybdenum, vanadium and iron nitrogenases. In this work, the expression of the Azotobacter vinelandii nifB gene was uncoupled from its natural nif regulation to show that NifB protein levels are lower in cells growing diazotrophically than in cells growing at the expense of ammonium. A. vinelandii carries a duplicated copy of the ATPase component of the ubiquitous ClpXP protease (ClpX2), which is induced under nitrogen fixing conditions. Inactivation of clpX2 resulted in the accumulation of NifB and NifEN and a defect in diazotrophic growth, especially when iron was in short supply. Mutations in nifE, nifN and nifX or in nifA also affected NifB accumulation, suggesting that NifB susceptibility to degradation might vary during its catalytic cycle.
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Affiliation(s)
- Giselle Martínez-Noël
- Fundación IMDEA Energía, Centro de Biotecnología y Genómica de Plantas, Campus Montegancedo, Pozuelo de Alarcón 28223 Madrid, Spain
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Hernandez JA, Phillips AH, Erbil WK, Zhao D, Demuez M, Zeymer C, Pelton JG, Wemmer DE, Rubio LM. A sterile alpha-motif domain in NafY targets apo-NifDK for iron-molybdenum cofactor delivery via a tethered domain. J Biol Chem 2010; 286:6321-8. [PMID: 21156797 DOI: 10.1074/jbc.m110.168732] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
NafY participates in the final steps of nitrogenase maturation, having a dual role as iron-molybdenum cofactor (FeMo-co) carrier and as chaperone to the FeMo-co-deficient apo-NifDK (apo-dinitrogenase). NafY contains an N-terminal domain of unknown function (n-NafY) and a C-terminal domain (core-NafY) necessary for FeMo-co binding. We show here that n-NafY and core-NafY have very weak interactions in intact NafY. The NMR structure of n-NafY reveals that it belongs to the sterile α-motif (SAM) family of domains, which are frequently involved in protein-protein interactions. The presence of a SAM domain in NafY was unexpected and could not be inferred from its amino acid sequence. Although SAM domains are very commonly found in eukaryotic proteins, they have rarely been identified in prokaryotes. The n-NafY SAM domain binds apo-NifDK. As opposed to full-length NafY, n-NafY impaired FeMo-co insertion when present in molar excess relative to FeMo-co and apo-NifDK. The implications of these observations are discussed to offer a plausible mechanism of FeMo-co insertion. NafY domain structure, molecular tumbling, and interdomain motion, as well as NafY interaction with apo-NifDK are consistent with the function of NafY in FeMo-co delivery to apo-NifDK.
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Affiliation(s)
- Jose A Hernandez
- Department of Biochemistry, Arizona College of Osteopathic Medicine, Midwestern University Arizona, Glendale, Arizona 85308, USA
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Abstract
The molybdenum nitrogenase is responsible for most biological nitrogen fixation, a prokaryotic metabolic process that determines the global biogeochemical cycles of nitrogen and carbon. Here we describe the trafficking of molybdenum for nitrogen fixation in the model diazotrophic bacterium Azotobacter vinelandii. The genes and proteins involved in molybdenum uptake, homeostasis, storage, regulation, and nitrogenase cofactor biosynthesis are reviewed. Molybdenum biochemistry in A. vinelandii reveals unexpected mechanisms and a new role for iron-sulfur clusters in the sequestration and delivery of molybdenum.
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Affiliation(s)
- Jose A Hernandez
- Department of Biochemistry, Midwestern University, Glendale, Arizona 85308, USA
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George SJ, Igarashi RY, Xiao Y, Hernandez JA, Demuez M, Zhao D, Yoda Y, Ludden PW, Rubio LM, Cramer SP. Extended X-ray absorption fine structure and nuclear resonance vibrational spectroscopy reveal that NifB-co, a FeMo-co precursor, comprises a 6Fe core with an interstitial light atom. J Am Chem Soc 2008; 130:5673-80. [PMID: 18386899 DOI: 10.1021/ja0755358] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
NifB-co, an Fe-S cluster produced by the enzyme NifB, is an intermediate on the biosynthetic pathway to the iron molybdenum cofactor (FeMo-co) of nitrogenase. We have used Fe K-edge extended X-ray absorption fine structure (EXAFS) spectroscopy together with (57)Fe nuclear resonance vibrational spectroscopy (NRVS) to probe the structure of NifB-co while bound to the NifX protein from Azotobacter vinelandii. The spectra have been interpreted in part by comparison with data for the completed FeMo-co attached to the NafY carrier protein: the NafY:FeMo-co complex. EXAFS analysis of the NifX:NifB-co complex yields an average Fe-S distance of 2.26 A and average Fe-Fe distances of 2.66 and 3.74 A. Search profile analyses reveal the presence of a single Fe-X (X = C, N, or O) interaction at 2.04 A, compared to a 2.00 A Fe-X interaction found in the NafY:FeMo-co EXAFS. This suggests that the interstitial light atom (X) proposed to be present in FeMo-co has already inserted at the NifB-co stage of biosynthesis. The NRVS exhibits strong bands from Fe-S stretching modes peaking around 270, 315, 385, and 408 cm(-1). Additional intensity at approximately 185-200 cm(-1) is interpreted as a set of cluster "breathing" modes similar to those seen for the FeMo-cofactor. The strength and location of these modes also suggest that the FeMo-co interstitial light atom seen in the crystal structure is already in place in NifB-co. Both the EXAFS and NRVS data for NifX:NifB-co are best simulated using a Fe 6S 9X trigonal prism structure analogous to the 6Fe core of FeMo-co, although a 7Fe structure made by capping one trigonal 3S terminus with Fe cannot be ruled out. The results are consistent with the conclusion that the interstitial light atom is already present at an early stage in FeMo-co biosynthesis prior to the incorporation of Mo and R-homocitrate.
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Affiliation(s)
- Simon J George
- Advanced Biological and Environmental X-ray Facility, Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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Ruiz MR, Matsushita M, Visentainer JV, Hernandez JA, De A Ribeiro EL, Shimokomaki M, Reeves JJ, De Souza NE. Proximate chemical composition and fatty acid profiles of Longissimus Proximate chemical composition and fatty acid profiles of Longissimus thoracis from pasture fed LHRH immunocastrated, castrated and intact Bos indicus bulls. S AFR J ANIM SCI 2007. [DOI: 10.4314/sajas.v35i1.4044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Gómez Ros LV, Aznar-Asensio GJ, Hernandez JA, Bernal MA, Núñez-Flores MJL, Cuello J, Ros Barceló A. Structural motifs of syringyl peroxidases are conserved during angiosperm evolution. J Agric Food Chem 2007; 55:4131-8. [PMID: 17439232 DOI: 10.1021/jf063164t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The most distinctive variation in the monomer composition of lignins in vascular land plants is that between the two main groups of seed plants. Thus, whereas gymnosperm (softwood) lignins are typically composed of guaiacyl (G) units, angiosperm (hardwood) lignins are largely composed of similar levels of G and syringyl (S) units. However, there are some studies that suggest that certain angiosperm peroxidases are unable to oxidize sinapyl alcohol, and a coniferyl alcohol shuttle has been proposed for oxidizing S units during the biosynthesis of lignins. With this in mind, a screening of the presence of S peroxidases in angiosperms (including woody species and forages) was performed. Contrarily to what might be expected, the intercellular washing fluids from lignifying tissues of 25 woody, herbaceous, and shrub species, belonging to both monocots and dicotyledons, all showed both S peroxidase activities and basic peroxidase isoenzymes analogous, with regard the isoelectric point, to the Zinnia elegans basic peroxidase isoenzyme, the only S peroxidase that has been fully characterized. These results led to the protein database in the search for homologies between angiosperm peroxidases and a true eudicot S peroxidase, the Z. elegans peroxidase. The findings showed that certain structural motifs of S peroxidases are conserved within the first 15 million years of angiosperm history, because they are found in peroxidases from the two major lineages of flowering plants, eumagnoliids and eudicotyledons, of note being the presence of these peroxidases in Amborella and Nymphaeales, which represent the first stages of angiosperm evolution. These phylogenetic studies also suggest that guaiacyl peroxidases apparently constitute the most "evolved state" of the plant peroxidase family evolution.
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Affiliation(s)
- Laura V Gómez Ros
- Department of Plant Biology, University of Murcia, E-30100 Murcia, Spain
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Abstract
Medical information systems are not designed for clinical trials using clinical imaging. This paper presents a conceptual model for clinical trials based on medical imaging from two complementary points of view: a technical model and a business model. A Web information system (WIS) for supporting multicenter clinical trials has been designed to implement the proposed model. We show that our approach overcomes the actual limitations by facilitating medical image management in the context of clinical trials or cooperative research.
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Affiliation(s)
- J A Hernandez
- Rey Juan Carlos University, 28933 Móstoles, Madrid, Spain.
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Hernandez JA, Igarashi RY, Soboh B, Curatti L, Dean DR, Ludden PW, Rubio LM. NifX and NifEN exchange NifB cofactor and the VK-cluster, a newly isolated intermediate of the iron-molybdenum cofactor biosynthetic pathway. Mol Microbiol 2006; 63:177-92. [PMID: 17163967 DOI: 10.1111/j.1365-2958.2006.05514.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The iron-molybdenum cofactor of nitrogenase (FeMo-co) is synthesized in a multistep process catalysed by several Nif proteins and is finally inserted into a pre-synthesized apo-dinitrogenase to generate mature dinitrogenase protein. The NifEN complex serves as scaffold for some steps of this synthesis, while NifX belongs to a family of small proteins that bind either FeMo-co precursors or FeMo-co during cofactor synthesis. In this work, the binding of FeMo-co precursors and their transfer between purified Azotobacter vinelandii NifX and NifEN proteins was studied to shed light on the role of NifX on FeMo-co synthesis. Purified NifX binds NifB cofactor (NifB-co), a precursor to FeMo-co, with high affinity and is able to transfer it to the NifEN complex. In addition, NifEN and NifX exchange another [Fe-S] cluster that serves as a FeMo-co precursor, and we have designated it as the VK-cluster. In contrast to NifB-co, the VK-cluster is electronic paramagnetic resonance (EPR)-active in the reduced and the oxidized states. The NifX/VK-cluster complex is unable to support in vitro FeMo-co synthesis in the absence of NifEN because further processing of the VK-cluster into FeMo-co requires the simultaneous activities of NifEN and NifH. Our in vitro studies suggest that the role of NifX in vivo is to serve as transient reservoir of FeMo-co precursors and thus help control their flux during FeMo-co synthesis.
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Affiliation(s)
- Jose A Hernandez
- Department of Plant and Microbial Biology, University of California-Berkeley, Berkeley, CA 94720, USA
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33
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Soboh B, Igarashi RY, Hernandez JA, Rubio LM. Purification of a NifEN protein complex that contains bound molybdenum and a FeMo-Co precursor from an Azotobacter vinelandii DeltanifHDK strain. J Biol Chem 2006; 281:36701-9. [PMID: 17012743 DOI: 10.1074/jbc.m606820200] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The NifEN protein complex serves as a molecular scaffold where some of the steps for the assembly of the iron-molybdenum cofactor (FeMo-co) of nitrogenase take place. A His-tagged version of the NifEN complex has been previously purified and shown to carry two identical [4Fe-4S] clusters of unknown function and a [Fe-S]-containing FeMo-co precursor. We have improved the purification of the his-NifEN protein from a DeltanifHDK strain of Azotobacter vinelandii and have found that the amounts of iron and molybdenum within NifEN were significantly higher than those reported previously. In an in vitro FeMo-co synthesis system with purified components, the NifEN protein served as a source of both molybdenum and a [Fe-S]-containing FeMo-co precursor, showing significant FeMo-co synthesis activity in the absence of externally added molybdate. Thus, the NifEN scaffold protein, purified from DeltanifHDK background, contained the Nif-Bco-derived Fe-S cluster and molybdenum, although these FeMo-co constituents were present at different levels within the protein complex.
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Affiliation(s)
- Basem Soboh
- Department of Plant and Microbial Biology, University of California at Berkeley, Berkeley, California 94720, USA
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Abstract
Ferric uptake regulator (Fur) proteins are widely recognized as repressors that in many prokaryotes regulate a large number of genes involved in iron homeostasis and oxidative stress response. In our study, we were able to identify the complete sequence of the fur gene from Microcystis aeruginosa using inverse-polymerase chain reaction. DNA sequence analysis confirmed the presence of a 183 amino-acid open reading frame that showed high identity with Fur proteins reported for cyanobacteria. The recombinant Fur protein has been purified and electrophoretical mobility shift assays shown to be active. Mn2+ and dithiothreitol enable Fur to bind to its promoter, with dithiothreitol being more potent. The expression of Fur in Microcystis was induced about twofold in iron-deficient conditions.
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Affiliation(s)
- Beatriz Martin-Luna
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, and Biocomputation and Complex Systems Physics Institute, Universidad de Zaragoza, Zaragoza, Spain
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Hernandez JA, Zanella EL, Bogden R, de Avila DM, Gaskins CT, Reeves JJ. Reproductive characteristics of grass-fed, luteinizing hormone-releasing hormone-immunocastrated Bos indicus bulls1. J Anim Sci 2005; 83:2901-7. [PMID: 16282630 DOI: 10.2527/2005.83122901x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Two field trials were conducted in Brazil to evaluate LHRH immunocastration of Bos indicus bulls (d 0 = 2 yr of age). In Study I, 72 bulls were assigned randomly to one of three treatment groups: LHRH0-immunized, castrated, and intact. Immunized animals (n = 25) received a primary and two booster injections of ovalbumin-LHRH-7 and thioredoxin-LHRH-7 fusion proteins on d 0, 141, and 287. Twenty-three bulls were surgically castrated on d 141, and 24 served as intact controls. All animals were slaughtered on d 385, at approximately 3 yr of age. In Study II, 216 bulls were assigned randomly to the same three treatments as in Study I; however, because of a drought in the area, bulls were kept on pasture an additional year, and a fourth treatment was added, in which one-half the LHRH-immunized bulls received an additional booster on d 639 (fourth immunization). All animals in Study II were slaughtered on d 741 (4 yr of age). Luteinizing hormone-releasing hormone antibodies increased following each immunization for immunized bulls, but they were not detectable in castrate or intact animals in either study. Consequently, scrotal circumference was suppressed in immunized bulls compared with intact controls in both studies. By d 287, serum concentrations of testosterone in LHRH-immunized bulls were decreased compared with intact controls (P < 0.01). In both studies, testes and epididymal weights at slaughter were greater (P < 0.01) for intact (500 +/- 17 and 60 +/- 2 g, respectively) than for immunized bulls (173 +/- 22 and 26 +/- 2 g, respectively) and fourth immunization bulls (78 +/- 23 and 20 +/- 2 g, respectively; Study II). At the end of each study, BW was greater (P < 0.01) for intact bulls than for castrated and LHRH-immunized animals. In these two studies, the efficacy of the LHRH fusion proteins to induce an effect similar to that of surgical castration was considered 92 and 93%, respectively. These data support the concept that immunocastration of bulls at 2 yr of age was successful and that it has practical application as a tool for producing grass-fattened bulls in Brazil.
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Affiliation(s)
- J A Hernandez
- Department of Animal Sciences, Center for Reproductive Biology, Washington State University, Pullman, 99164, USA
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Obeidat BS, Strickland JR, Vogt ML, Taylor JB, Krehbiel CR, Remmenga MD, Clayshulte-Ashley AK, Whittet KM, Hallford DM, Hernandez JA. Effects of locoweed on serum swainsonine and selected serum constituents in sheep during acute and subacute oral/intraruminal exposure1. J Anim Sci 2005; 83:466-77. [PMID: 15644521 DOI: 10.2527/2005.832466x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A study was conducted to evaluate the effects of acute and subacute locoweed exposure on serum swainsonine concentrations and selected serum constituents in sheep. Thirteen mixed-breed wethers (BW = 47.5 +/- 9.3 kg) were assigned randomly to 0.2, 0.4, or 0.8 mg of swainsonine x kg BW(-1) x d(-1) treatments. During acute (24 h) and subacute (19 d) exposure, serum swainsonine was detected in all treatments and was greatest (P < 0.03) in the 0.8 mg treatment. Serum alkaline phosphate (ALK-P) activity was increased (P < 0.01) for the 0.8 mg treatment compared with baseline (0 h) by 7 h and continued to increase throughout the initial 22 h following acute exposure to locoweed. A linear increase (P < 0.01) in serum ALK-P activity was noted, with the rate being 3.00 +/- 0.56 U x L(-1) x h(-1). Serum ALK-P activity was increased (P < 0.05) across treatments on d 7 over d -19, -12, 0, 1, 21, and 26; on d 14 over d -19, -12, 0, and 26; and on d 19 over d -19, -12, 0, 1, 21, and 26. By d 20, approximately 48 h after last exposure to swainsonine, serum ALK-P activities were no longer different (P = 0.13) than baseline (d -19, -12, and 0), and by d 26 values had generally returned to baseline. No linear (P = 0.98), quadratic (P = 0.63), or cubic effects of swainsonine with time from exposure were noted for serum aspartate aminotransferase. Similar to serum ALK-P activities, serum aspartate aminotransferase activities were increased (P < 0.05) across treatment levels on d 7, 14, 19, 20, 21, and 26 over those on d -19, -12, 0, and 1. Total serum Fe was decreased (P < 0.05) within the initial 22 h following the swainsonine exposure. On d 21 (48 h after swainsonine feeding ended), serum Fe increased to 472 mg/L. Concentrations of ceruloplasmin were lower (P < 0.10) on d 14 and 19 following exposure to locoweed. Recovery of ceruloplasmin levels coincided with similar changes in serum Fe. There was a linear (slope = 0.33 mg x dL(-1) x d(-1); P < 0.01) effect with time of exposure to locoweed (i.e., swainsonine) on serum triglyceride concentrations. Rapid changes in serum ALK-P and Fe concentrations without parallel changes in other damage markers indicate that acute exposure to swainsonine induces metabolic changes that may impair animal production and health before events of cytotoxicity thought to induce clinical manifestation of locoism.
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Affiliation(s)
- B S Obeidat
- New Mexico State University, Las Cruces 88003, USA
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Abstract
A longitudinal study was conducted to examine the relationship between lameness and delayed ovarian cyclicity during the first 60 d postpartum and days to first luteal activity during the first 300 d postpartum in Holstein cows. Two hundred thirty-eight cows from a 600-cow dairy that calved during a 12-mo period were used. Cows were classified into 1 of 6 categories of lameness during the first 35 d postpartum using a locomotion scoring system. Cows were blood-sampled weekly for detection of plasma progesterone concentrations during the first 300 d postpartum. Cows with delayed resumption of ovarian cyclicity were defined as those with progesterone concentrations consistently <1 ng/mL during the first 60 d postpartum. The null hypothesis that risk of delayed cyclicity is the same in cows classified as nonlame, moderately lame, or lame (after adjusting for potential modifying or confounding effects of loss of body condition and other variables related with delayed cyclicity) was tested using logistic regression. Analysis of results of the study reported here support the hypothesis that lameness is associated with delayed ovarian activity in Holstein cows during the early postpartum period. Cows classified as lame had 3.5 times greater odds of delayed cyclicity, compared with cows classified as nonlame. Attributable proportion analysis indicated that delayed ovarian cyclicity in lame cows would be reduced by 71%, if lameness had been prevented.
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Affiliation(s)
- E J Garbarino
- College of Veterinary Medicine, Department of Large Animal Clinical Sciences, University of Florida, Gainesville, 32610-0136, USA
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Shah RK, Oto A, Ozkan OS, Ernst RD, Hernandez JA, Chaudhary HB, Koroglu M. Adrenal oncocytoma: US and CT findings. JBR-BTR 2004; 87:180-2. [PMID: 15487257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
We describe a case of an oncocytoma occurring in the adrenal gland, a rare location, and describe US and CT findings of this tumor in our patient. The mass was well marginated but heterogeneous on both CT and US and unfortunately the imaging findings of the tumor are non-specific.
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Affiliation(s)
- R K Shah
- The University of Texas Medical Branch, Department of Radiology, 301 University Blvd., Galveston,Texas 77555-0709, USA
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Brown MP, Plaas AHK, Sandy JD, Hernandez JA, Merritt KA. 4 THE EFFECTS OF EXERCISE AND INJURY ON CHONDROITIN SULFATE AND KERATAN SULFATE CONTENT IN EQUINE SYNOVIAL FLUID. Vet Surg 2003. [DOI: 10.1111/j.1532-950x.2003.599_4.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shah RK, Shaw SA, Marroquin S, Tatum J, Ernst RE, Swischuk LE, Hernandez JA. Adult intussuception as a cause of abdominal symptoms: a case report and review of literature. Emerg Radiol 2003; 10:53-6. [PMID: 15290534 DOI: 10.1007/s10140-002-0266-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2002] [Accepted: 11/12/2002] [Indexed: 11/30/2022]
Abstract
Intussusceptions are frequently encountered in children. In adults, they are uncommon and have a different etiology. Our case is one such example of a rare, pathologically proven, recto-rectal intussusception due to an adenocarcinoma with characteristic CT findings.
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Affiliation(s)
- Rajeev K Shah
- The University of Texas Medical Branch at Galveston, Department of Radiology, 301 University Blvd., Galveston, TX 77555-0709, USA.
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Wells NH, Hallford DM, Hernandez JA. Serum thyroid hormones and reproductive characteristics of Rambouillet ewe lambs treated with propylthiouracil before puberty. Theriogenology 2003; 59:1403-13. [PMID: 12527086 DOI: 10.1016/s0093-691x(02)01184-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Twenty-four Rambouillet ewe lambs (average weight=43.7+/-1.2 kg, approximately 6 months of age) were used to examine the effect of thyroid suppression before the onset of puberty on serum thyroid hormones, body weights (BW), and reproductive performance. Beginning in early September, ewe lambs were randomly assigned to three treatments (n=8 lambs/treatment). All animals remained in a single pen (4 x 12 m) with access to salt, water, shade and alfalfa hay (2.5 kg per animal per day) throughout the experiment. Beginning on Day 0 (first day of treatment), all ewe lambs received daily treatments (gavage) for 15 days consisting of 0, 20, or 40 mg 6-N-propyl-2-thiouracil(PTU)/kg BW per day. Beginning on Day 15, the 20 and 40 mg treatments were lowered to 10 and 20 mg PTU/kg BW, respectively. All animals were treated for 28 days. Ovarian cyclicity was determined by twice weekly progesterone (P(4)) analysis. Thyroxine (T(4)) concentrations were similar on Day 0 (61.6, 54.8 and 56.9+/-2.5 ng/ml, P=0.17) in ewe lambs receiving 0, 20 and 40 mg PTU/kg BW, respectively. By Day 7, both PTU-treated groups had T(4) values less than 20 ng/ml (9.0 and 15.4+/-2.5 ng/ml) compared with 78.5 ng/ml in controls (P<0.01). By 7 days after termination of PTU treatment, serum T(4) had risen to 29.1 and 26.9 (+/-2.9)ng/ml in the 20/10 and 40/20 PTU groups, respectively. On Day 66, control ewes had 55.0 ng T(4)/ml compared with 43.1 and 39.0 (+/-2.6 ng/ml) for ewes in the 20/10 and 40/20 groups, respectively (linear, P<0.01). Serum triiodothyronine (T(3)) followed a similar pattern to that observed for T(4). Ewe lamb BW were similar (P>0.50) among groups throughout the treatment period. However, following the treatment, PTU-treated ewes tended (P<0.10) to weigh less than controls. Average Julian day of puberty was also similar (P>0.50) among treatments (286, 288 and 288+/-5 days; control, 20/10 and 40/20, respectively). Control ewes had a pregnancy rate of 75%, while both PTU-treated groups had pregnancy rates of 88% (P>0.20). The administration of PTU resulted in a rapid decline in serum T(4) and T(3) but neither time of puberty nor pregnancy rates were affected by lowered thyroid hormones.
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Affiliation(s)
- N H Wells
- Department of Animal and Range Sciences, New Mexico State University, Box 30003, MSC 3I, Las Cruces, NM 88003, USA
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Hernandez JA, Hallford DM, Wells NH. Ovarian cyclicity in thyroid-suppressed ewes treated with propylthiouracil immediately before onset of seasonal anestrus. J Anim Sci 2003; 81:29-34. [PMID: 12597369 DOI: 10.2527/2003.81129x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Two experiments were conducted to determine if propylthiouracil (PTU)-induced thyroid suppression immediately before onset of anestrus would extend the breeding season in mature ewes. In Exp. 1, twice-weekly serum concentrations of progesterone indicated that all ewes were cyclic before initiation of treatment. Beginning on d 0 (January 17), ewes received 0 (n = 4), 20 (n = 5), or 40 (n = 5) mg of PTU x kg(-1) of body weight (BW) x (-1) for 35 d. Blood samples were collected regularly throughout the trial and serum thyroxine and progesterone were quantified. Ewe BW were similar (P > 0.90) among treatments before the experiment began (mean = 78.2 +/- 4.5 kg). Likewise, serum concentrations of thyroxine averaged 86.5 +/- 8.0 ng/mL on d 0. After 11 d of PTU treatment, serum thyroxine was 90.2,75.2, and 44.2 +/- 14.0 ng/mL in ewes receiving 0, 20, and 40 mg of PTU/kg BW, respectively (linear effect, P = 0.04). On d 20, thyroxine values in the three respective groups were 73.0, 51.1, and 16.1 +/- 12.9 ng/mL (linear effect, P < 0.01). Fourteen days after PTU treatment ended, serum thyroxine did not differ (P = 0.53) among the three respective groups (71.4,73.3, and 57.5 +/- 11.8 ng/mL). Ewes receiving PTU tended to weigh less on d 42 (84.2, 78.2, and 71.8 +/- 5.1 kg for ewes treated with 0, 20, and 40 mg PTU/kg, respectively; linear effect, P = 0.10). Day of onset of anestrus was designated as the day on which serum progesterone decreased and remained below 1 ng/mL. Ewes treated with 0, 20, or 40 mg of PTU/kg BW became anestrous on d 16,40, and 81 (+/- 12) of the experiment, respectively (linear effect, P < 0.01). At the time the 35-d treatment period ended, 25, 60, and 100% of ewes receiving 0, 20, or 40 mg of PTU/kg exhibited normal estrous cycles. In Exp. 2, ewes received 0, 20, or 40 mg of PTU/kg BW for 14 d. The dose was then decreased to 0, 10, and 20 mg of PTU/kg BW for the remaining 21 d. Serum thyroxine decreased to concentrations below 20 ng/mL by d 9 after initiation of PTU treatment. Ewe weights did not differ throughout the trial and no BW loss was observed. The average day that each group entered anestrus was similar to those in Exp 1. Large doses of PTU dramatically lower serum thyroxine and this effect appears to inhibit onset of anestrus in ewes.
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Affiliation(s)
- J A Hernandez
- Department of Animal and Range Sciences, New Mexico State University, Las Cruces 88003, USA
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Thomas MG, Enns RM, Hallford DM, Keisler DH, Obeidat BS, Morrison CD, Hernandez JA, Bryant WD, Flores R, Lopez R, Narro L. Relationships of metabolic hormones and serum glucose to growth and reproductive development in performance-tested Angus, Brangus, and Brahman bulls. J Anim Sci 2002; 80:757-67. [PMID: 11890413 DOI: 10.2527/2002.803757x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Understanding mechanisms that regulate growth and reproduction are important for improving selection strategies in cattle. In this study, Angus, Brangus, and Brahman bulls (n = 7 per breed) of similar age were selected from a group of 65 weanlings. Bulls were evaluated after weaning (i.e., approximately 6 mo of age) for 112 d for serum concentrations of metabolic hormones and glucose, growth, and reproductive traits. Performance data and blood sera were collected on d 0, 28, 56, 84, and 112. Sera were also collected in periods from d 50 to 59 (56D) and 103 to 112 (112D). Angus bulls were heavier (P < 0.05) throughout the study than Brahman bulls and were heavier than Brangus bulls on d 56, 84, and 112. Initial and final BW for Angus, Brangus, and Brahman bulls were 292.7, 260.6, and 230.4 and 468.3, 435.6, and 350.7 +/- 12 kg, respectively. Conversely, Brahman bulls had greater hip height (P < 0.05) than Brangus, and Brangus were taller (P < 0.05) than Angus. Angus bulls had the greatest (P < 0.05) scrotal circumference (SC) and Brahman bulls the least. Mean SC across days was 31.5, 29.7, and 25.0 +/- 0.6 cm for the three respective breeds. Serum testosterone was greater (P < 0.01) in Angus and Brangus bulls (10.0 and 8.9 +/- 1.4 ng/mL) than in Brahman bulls (4.0 +/- 1.4 ng/mL) throughout the study. After d 112, 100, 86, and 57% of the Angus, Brangus, and Brahman bulls passed a breeding soundness exam (P = 0.51). Serum concentrations of IGF-I and leptin were greater (P < or = 0.06) in Angus bulls on d 56, 84, and 112 than in Brangus and Brahman bulls. Serum concentrations of GH (P < 0.08) and glucose (P < 0.03) were greater in Brangus bulls than in Angus or Brahman bulls throughout the study. Prediction analyses suggested that serum concentrations of leptin could be used to predict (P < or = 0.08) BW and SC (R2 > 0.82) in the 56D and 112D periods among these breeds. Leptin was also useful in predicting (P < or = 0.09) serum concentrations of GH and testosterone in the 112D period (R2 > 0.32). Residual correlation analyses with the effect of breed removed suggested that leptin was correlated (r > or => 0.53, P < 0.05) with both SC and serum testosterone. Angus and Brahman cattle differ in phenotype, level of adiposity, and rate of sexual development. Data herein suggest that these characteristics could be due to varying mechanisms by which metabolic hormones such as leptin, GH, and(or) IGF-I are regulated.
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Affiliation(s)
- M G Thomas
- Department of Animal and Range Sciences, New Mexico State University, Las Cruces 88003, USA.
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Shirley KL, Hernandez JA, Hallford DM, Thomas MG. Serum luteinizing hormone, growth hormone and insulin-like growth factor-I after releasing hormone challenge in prepubertal ewe lambs selected for twinning. Theriogenology 2001; 56:867-77. [PMID: 11665888 DOI: 10.1016/s0093-691x(01)00614-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two studies evaluated hormonal markers as indicators of the onset of puberty in Debouillet sheep selected for twinning. In Trial 1, 29 ewe lambs (50 +/- 0.5 kg, 159 to 187 d of age) were given 10 microg GnRH (i.v.) on September 15 and blood was collected at 30 min intervals after the injection for 2 h. Additional samples were taken twice weekly and progesterone (P4) was measured. The day that serum P4 was greater than 1 ng/mL for 2 consecutive sampling days was classified as the day of puberty. Average day of puberty was October 12 (average age at puberty was 199 d) and ewes with values less or greater than the average were classified as early or late, respectively. Average weight at GnRH challenge was 50 kg and ewes weighing less or more were classified as light or heavy, respectively. Early ewes weighed more (P = 0.01) and reached puberty sooner (P = 0.01) than late ewes. Heavy lambs reached puberty earlier, weighed more at GnRH challenge, and had more LH area under the curve (AUC, P < 0.05) than light ewes. In Trial 2, we gave 27 ewe lambs (54 +/- 0.9 kg, 173 to 189 d of age) a single i.v. injection of 10 microg GnRH and 10 microg GHRH on September 17. Average day of puberty was October 13, average weight was 54 kg, and average age at puberty was 208 d. Categories were designated as described for Trial 1. Early lambs reached puberty sooner (P = 0.01) and weighed more (P = 0.01) than late lambs, but the puberty groups had similar LH AUC (P = 0.64) and GH AUC (P = 0.75), whereas IGF-I was greater (P = 0.01) in early puberty ewes than in late puberty ewes. Heavy lambs reached puberty earlier (P = 0.06), weighed more (P = 0.01), and tended (P = 0.11) to have more GH AUC than light ewes. No difference was observed in LH AUC or IGF-I between weight groups (P > 0.15). Results suggest that serum LH after GnRH is not a reliable indicator of the onset of puberty in ewe lambs selected for twinning, but heavier ewes tended to produce more GH after a GHRH challenge and reach puberty earlier than lighter ewe lambs.
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Affiliation(s)
- K L Shirley
- Department of Animal and Range Sciences, New Mexico State University, Las Cruces 88003, USA
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Desco M, Hernandez JA, Santos A, Brammer M. Multiresolution analysis in fMRI: sensitivity and specificity in the detection of brain activation. Hum Brain Mapp 2001; 14:16-27. [PMID: 11500987 PMCID: PMC6872021 DOI: 10.1002/hbm.1038] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Multiresolution analysis of fMRI studies using wavelets is a new approach, previously reported to yield higher sensitivity in the detection of activation areas. No data are available, however, in the literature on the analytic approach and wavelet bases that produce optimum results. The present study was undertaken to assess the performance of different wavelet decomposition schemes by making use of a "gold standard," a realistic computer-simulated phantom. As activation areas are then known "a priori," accurate assessments of sensitivity, specificity, ROC curve area and spatial resolution can be obtained. This approach has allowed us to study the effect of different factors: the size of the activation area, activity level, signal-to-noise ratio (SNR), use of pre-smoothing, wavelet base function and order and resolution level depth. Activations were detected by performing t-tests in the wavelet domain and constructing the final image from those coefficients that passed the significance test at a given P-value threshold. In contrast to previously reported data, our simulation study shows that lower wavelet orders and resolution depths should be used to obtain optimum results (in terms of ROC curve area). The Gabor decomposition offers the maximum fidelity in preserving activation area shapes. No major differences were found between other wavelet bases functions. Data pre-smoothing increases ROC area for all but very small activation region sizes.
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Affiliation(s)
- M Desco
- Medicina Experimental, Hospital General Universitario Gregorio Marañón, Dr. Esquerdo 46, E-28007 Madrid, Spain.
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Lelièvre J, Amor M, Flores B, Gomez M, El-Yahyaoui F, Chatenet C, Périn C, Hernandez JA, Romojaro F, Latché A, Bouzayen M, Pitrat M, Dogimont C, Pech J. ETHYLENE-REGULATED GENES AND CLARIFICATION OF THE ROLE OF ETHYLENE IN THE REGULATION OF RIPENING AND QUALITY IN CANTALOUPE MELON FRUIT. ACTA ACUST UNITED AC 2000. [DOI: 10.17660/actahortic.2000.510.77] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Crook TW, Rogers BB, McFarland RD, Kroft SH, Muretto P, Hernandez JA, Latimer MJ, McKenna RW. Unusual bone marrow manifestations of parvovirus B19 infection in immunocompromised patients. Hum Pathol 2000; 31:161-8. [PMID: 10685629 DOI: 10.1016/s0046-8177(00)80215-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Parvovirus B19 is responsible for a spectrum of disease in humans. The usual bone marrow findings in acute parvovirus infections are marked erythroid hypoplasia and occasional giant erythroblasts. Intranuclear inclusions in developing erythroid precursors are rarely described in children or adults with parvovirus infection, although abundant intranuclear inclusions are commonly observed in the placenta and other tissues in infected fetuses. In this study, 8 patients are reported in whom the first evidence of parvovirus infection was the recognition of numerous intranuclear inclusions in erythroid precursors on bone marrow biopsy sections. Six of the 8 patients had documented immunodeficiencies; 4 had acquired immune deficiency syndrome (AIDS), and 2 were on chemotherapy. Five of 7 patients were negative for immunoglobulin G (IgG) antiparvovirus antibodies, including all 4 with AIDS. Unlike the typical pattern in parvovirus infection, the bone marrow was hypercellular in most of the patients, and erythroid precursors were usually increased with the entire spectrum of normoblast maturation represented; abundant intranuclear inclusions were observed similar to the finding in fetuses. The inclusions were variably eosinophilic and compressed the chromatin against the nuclear membrane. In situ hybridization showed parvovirus B19 DNA in numerous erythroid precursors in all cases. The findings of erythroid maturation and abundant viral inclusions in these immunocompromised patients is consistent with the hypothesis that failure to produce effective IgG parvovirus neutralizing antibodies may lead to persistent infection through viral tolerance that allows erythroid development of infected cells past the pronormoblast stage. Identification of parvovirus inclusions in marrow biopsies and subsequent confirmation of infection by in situ hybridization can be important in the assessment of anemia in immunodeficient patients because serological studies for parvovirus B19 are frequently negative.
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Affiliation(s)
- T W Crook
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas 75235-9072, USA
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Monreal M, Roncales FJ, Ruiz J, Muchart J, Fraile M, Costa J, Hernandez JA. Secondary prevention of venous thromboembolism: A role for low-molecular-weight heparin. Haemostasis 1998; 28:236-43. [PMID: 10420072 DOI: 10.1159/000022437] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND After a short initial course of heparin therapy, patients with venous thrombo-embolism (VTE) require continuing anticoagulant therapy for several months after hospital discharge. At present, two small-scale studies have compared the efficacy and safety of low-molecular-weight heparin (LMWH) with warfarin in the secondary prevention of VTE. PATIENTS AND METHODS We studied 654 consecutive patients, 202 with pulmonary embolism (PE) and 452 patients with deep vein thrombosis (DVT) of the lower limbs. 220/654 patients (34%) were considered to have some contraindications to coumarin, and were discharged on LMWH (dalteparin, Fragmin((R)), 10, 000 IU s.c. once daily). The remaining 434/654 patients were asked to choose between either coumarin or LMWH: 190 patients preferred LMWH and 244 coumarin. Patients were followed up for a 3-month (DVT patients) or 6-month (PE patients) period. RESULTS 14/654 patients (2%) developed recurrent VTE while on anticoagulant therapy. One in every three recurrent episodes was PE (which was fatal in 2/5 patients), and half of the recurrent DVT were located in the contralateral leg. We failed to find any differences between patients receiving LMWH and those on coumarin therapy, but recurrences were more common in patients with cancer (hazard ratio: 17.15; 95% CI: 4.0-73.5; p < 0.001). 21 patients (3.3%) bled (major bleeding 5 patients; minor bleeding 16). Bleeding was more common in patients on coumarin therapy (hazard ratio: 3.14; 95% CI: 1.20-8.22; p = 0.02). CONCLUSIONS Long-term LMWH therapy proved to be both effective and safe in the long-term treatment of VTE. Thus, we suggest long-term LMWH therapy should be considered for patients with contraindications to coumarin, or those with difficulties in coming to laboratory control.
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Affiliation(s)
- M Monreal
- Servicio de Medicina Interna, Hospital Universitari Germans Trias i Pujol, Badalona, España, Spain.
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Pastori GM, Palma JM, Sandalio LM, Sevilla F, Corpas FJ, Jimenez A, Lopez-Huertas E, Hernandez JA. The activated oxygen role of peroxisomes in senescence. Plant Physiol 1998; 116:1195-200. [PMID: 9536035 PMCID: PMC1539175 DOI: 10.1104/pp.116.4.1195] [Citation(s) in RCA: 187] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
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Lasserre E, Godard F, Bouquin T, Hernandez JA, Pech JC, Roby D, Balagué C. Differential activation of two ACC oxidase gene promoters from melon during plant development and in response to pathogen attack. Mol Gen Genet 1997; 256:211-22. [PMID: 9393445 DOI: 10.1007/s004380050563] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
ACC (1-aminocyclopropane-1-carboxylate) oxidase genes are differentially expressed in melon during development and in response to various stresses. We investigated the molecular basis of their transcription by analyzing the 5' untranslated regions of the ACC oxidase genes CM-ACO1 and CM-ACO3. In order to determine how their temporal and spatial expression patterns were established, we fused the promoter regions of CM-ACO1 (726 bp) and CM-ACO3 (2260 bp) to the beta-glucuronidase (GUS) reporter gene and examined their regulation in transgenic tobacco plants. The CM-ACO1 promoter was able to drive GUS expression in response to wounding, and to treatment with ethylene or copper sulfate. It was also rapidly induced (8-12 h postinoculation) in tobacco leaves inoculated with the hypersensitive response (HR)-inducing bacterium Ralstonia solanacearum. Expression was also observed during compatible interactions but was delayed. In contrast, the CM-ACO3 promoter was not expressed in response to infection, but was up-regulated during flower development. Both promoters were regulated during leaf senescence but in different patterns. The CM-ACO1-driven GUS activity increased sharply concomitantly with the onset of chlorophyll breakdown, while the CM-ACO3 promoter drove strong GUS expression in green, fully expanded leaves and this declined at the onset of senescence. This result is consistent with the expression patterns of these two genes in senescent melon leaves. These data suggest that the regulation of expression of CM-ACO1 is related preferentially to stress responses, whereas CM-ACO3 seems to be associated with developmental processes. The possible role of ethylene is discussed, particularly in the regulation of the CM-ACO1 gene in response to stress and during senescence.
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Affiliation(s)
- E Lasserre
- Laboratoire Ethylène et Mécanismes Moléculaires de la Maturation des Fruits UA-INRA, Ecole Nationale Supérieure Agronomique de Toulouse, France
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