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Bazikian S, Pyun AJ, Zheng H, Padula W, Khan T, Ziegler K, Shin L, Magee GA, Rowe VL, Armstrong DG. Evaluating the impact of an interdisciplinary integrated limb preservation service operating concurrently with a single-specialty service. J Foot Ankle Res 2024; 17:e12013. [PMID: 38613833 DOI: 10.1002/jfa2.12013] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 04/02/2024] [Indexed: 04/15/2024] Open
Abstract
BACKGROUND This study examined the efficacy of an interdisciplinary limb preservation service (LPS) in improving surgical outcomes for diabetic foot ulcer (DFU) patients compared to traditional care. METHODS Data from January 1, 2017 to September 30, 2020 were retrospectively reviewed. An interdisciplinary LPS clinic began on August 1, 2018, coexisting with a preexisting single specialty service. Primary outcomes were major/minor amputation rates and ratios and hospital length of stay. Surgical endpoints pre- and post-LPS launch were compared. RESULTS Among 976 procedures for 731 unique DFU patients, most were male (80.4%) and Hispanic (89.3%). Patient demographics were consistent before and after LPS initiation. Major amputation rates decreased by 45.5% (15.4%-8.4%, p = 0.001), with outpatient procedures increasing over 5-fold (3.3% pre-LPS to 18.7% post-LPS, p < 0.001). Hospital stay reduced from 10.1 to 8.5 days post-LPS (p < 0.001). The major to minor amputation ratio declined from 22.4% to 12.7%. CONCLUSIONS The interdisciplinary LPS improved patient outcomes, marked by fewer major amputations and reduced hospital stays, suggesting the model's potential for broader application.
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Affiliation(s)
- Sebouh Bazikian
- Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Alyssa J Pyun
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Hanke Zheng
- Department of Pharmaceutical and Health Economics, Alfred E. Mann School of Pharmacy and Pharmaceutical Sciences, University of Southern California, Los Angeles, California, USA
- Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles, California, USA
| | - William Padula
- Department of Pharmaceutical and Health Economics, Alfred E. Mann School of Pharmacy and Pharmaceutical Sciences, University of Southern California, Los Angeles, California, USA
- Leonard D. Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles, California, USA
| | - Tanzim Khan
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Kenneth Ziegler
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Laura Shin
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Gregory A Magee
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Vincent L Rowe
- Division of Vascular Surgery and Endovascular Therapy, David Geffen School of Medicine, University of California, Los Angeles, California, USA
| | - David G Armstrong
- Division of Vascular Surgery and Endovascular Therapy, Department of Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
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Bultmann C, Wiggins J, Mukhopadhyay S, Flannery D, Conaway M, Dhudasia M, Garber S, Cantey JB, Schelonka R, Weitkamp H, Weimer K, Vyas D, Gilfillan M, Carey A, Wohrley J, Berenz A, Khan S, Favara M, Tuttle D, Ziegler K, Chang E, Gaulton J, Sanchez PJ, Kaufman D. 181. Potential Benefit of Masking and other COVID-19 Infection Prevention Measures on Late-Onset Infections in the NICU. Open Forum Infect Dis 2021. [PMCID: PMC8644148 DOI: 10.1093/ofid/ofab466.181] [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] [Indexed: 11/13/2022] Open
Abstract
Background Incidence of blood stream infections (BSI) among NICU admissions remains high, with associated mortality and morbidity. Due to COVID-19, there are increased infection prevention (IP) measures in NICUs including universal masking for all healthcare workers and families, social distancing, visitation restrictions, and increased attention to hand hygiene. These measures may also affect late-onset infection rates and offer understanding of novel interventions for prevention. Methods We examined infection rates during the 24 months prior to implementation of COVID-19 IP measures (PRE-period) compared to the months after implementation from April 2020 (POST-period). Late-onset infections were defined as culture-confirmed infection of the blood, urine, or identification of respiratory viral pathogens. An interrupted time series analysis of infection per 1000 patient days was performed based on a change-point Poisson regression with a lagged dependent variable and the number of patient days used as offsets. Each month was treated as independent with additional analysis using an observation-driven model to account for serial dependence. Results Multicenter analysis to date included all infants cared for at three centers (Level 3 and 4) from 2018-2020. Monthly BSI rates decreased in the POST-period at the three centers (Figure 1). At all centers actual BSI rate was lower than the expected rate in the POST-period (Figure 2). The combined BSI rate per 1000 patient days was 41% lower compared to the rate prior to implementation (95% CI, 0.42 to 0.84, P=0.004) (Table 1). In subgroup analysis by birthweight, infants< 1000g had a 39% reduction in BSI (P=0.023), for1000-1500g patients there was a 44% reduction (P=0.292) and in those > 1500g there was a 53% reduction (0.083). Figure 1. PRE and POST MASKING and other COVID Infection Prevention Measures and Monthly BSI Rates. ![]()
Figure 2. PRE and POST MASKING and other COVID infection prevention measures and BSI Trends. ![]()
At all centers actual BSI rate was lower than the expected rate for that center in the POST period. UVA and Duke showed a baseline decrease and Pennsylvania Hospital showed a downward trend in infection rates. There was an approximate decrease in expected bloodstream infection events at Pennsylvania Hospital by 7 events, at UVA by 22 events and at Duke by 23 events. Overall, all three centers saw a decrease in their expected infections after COVID-19 infection prevention measures were implemented. Table 1. Percent reduction in Bloodstream Infection at each center. ![]()
Conclusion In this preliminary analysis, we found a reduction of BSI after the implementation of COVID-19 infection prevention measures. Additionally, there were fewer viral infections, though there were a limited number of episodes. Further analyses of multicenter data and a larger number of patients will elucidate the significance of these findings and the role some of these IP measures such as universal masking may have in infection prevention in the NICU. Disclosures All Authors: No reported disclosures
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Sarah Khan
- McMaster University, Hamilton, Ontario, Canada, Hamilton, Ontario, Canada
| | - M Favara
- Christiana, Wilmington, Delaware
| | - D Tuttle
- Christiana, Wilmington, Delaware
| | | | - E Chang
- Abington, Abington, Pennsylvania
| | | | - Pablo J Sanchez
- Nationwide Children’s Hospital - The Ohio State University, Columbus, Ohio
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Magee GA, Potter HA, Ganapathy A, Fleischman F, Ziegler K, Weaver FA, Han SM. Transposition of Anomalous Left Vertebral to Carotid Artery During the Management of Aortic Disease. J Vasc Surg 2021. [DOI: 10.1016/j.jvs.2021.06.226] [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: 12/01/2022]
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Pyun AJ, Magee GA, Ding L, Potter H, Weaver FA, Rowe V, Ziegler K, Han SM. Incidence of Type III Endoleaks and Major Adverse Events When Using Multiple Aortic Endografts from Single Versus Multiple Manufacturers During Endovascular Aortic Repair. J Vasc Surg 2021. [DOI: 10.1016/j.jvs.2021.06.206] [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: 10/20/2022]
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Pyun AJ, Zhang L, Magee GA, Ziegler K, Weaver FA, Rowe V, O'Donnell K, Han SM. Performance of Viabahn VBX and iCast as Bridging Stents Across Physician-created Fenestrations During Endovascular Repair of Complex Abdominal and Thoracoabdominal Aortic Aneurysms. J Vasc Surg 2021. [DOI: 10.1016/j.jvs.2021.06.337] [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: 10/20/2022]
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Abdoli S, Sui J, Ziegler K, Katz S, Burnham W, Ochoa C. The periumbilical incision for anterior lumbar interbody fusions. J Vasc Surg Cases Innov Tech 2020; 6:384-387. [PMID: 32715175 PMCID: PMC7371723 DOI: 10.1016/j.jvscit.2020.06.011] [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] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/09/2020] [Indexed: 10/28/2022]
Abstract
The traditional retroperitoneal approach for the anterior lumbar interbody fusion (ALIF) uses a longitudinal paramedian incision. In this study, we use a discrete periumbilical incision. A 270-degree semicircular incision is made around the umbilicus and the subcutaneous tissue is dissected radially at a 45-degree angle, creating a mound around the umbilical stalk. Once the anterior sheath is encountered, the steps of the operation converge with those of the traditional approach. In this study, 30 patients underwent a periumbilical ALIF with an average of 2.1 levels fused. Perioperative outcomes were comparable to those described in the ALIF literature. No patients experienced complications attributable to the periumbilical incision.
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Affiliation(s)
- Sherwin Abdoli
- Department of Surgery, Huntington Memorial Hospital, Pasadena, Calif
| | - Jin Sui
- Department of Surgery, Huntington Memorial Hospital, Pasadena, Calif
| | - Kenneth Ziegler
- Division of Vascular Surgery and Endovascular Therapy, University of Southern California, Los Angeles, Calif
| | - Steven Katz
- Department of Surgery, Huntington Memorial Hospital, Pasadena, Calif.,Division of Vascular Surgery and Endovascular Therapy, University of Southern California, Los Angeles, Calif
| | - Walter Burnham
- Department of Surgery, Huntington Memorial Hospital, Pasadena, Calif
| | - Christian Ochoa
- Division of Vascular Surgery and Endovascular Therapy, University of Southern California, Los Angeles, Calif
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Abstract
The average density of states in a disordered three-dimensional Weyl system is discussed in the case of a continuous distribution of random scattering. Our results clearly indicate that the average density of states does not vanish, reflecting the absence of a critical point for a metal-insulator transition. This calculation supports recent suggestions of an avoided quantum critical point in the disordered three-dimensional Weyl semimetal. However, the effective density of states can be very small such that the saddle-approximation with a vanishing density of states might be valid for practical cases.
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Affiliation(s)
- K Ziegler
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
| | - A Sinner
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany
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Abstract
ZusammenfassungMotorische Blockaden während des Gehens sind als eine episodisch auftretende Störung der Ganginitiierung und des Lokomotionserhalts bei Parkinsonsyndromen und zentralen Gangstörungen definiert. Phänomenologisch werden Festination, trembling-in-place und total akinesia als Freezing-Formen unterschieden. Fünf differente Gangsituationen wurden als klassische Provokatoren für Freezing-Episoden benannt. Um eine Testung durch einen Beobachter klinisch einfach und aussagekräftig durchführen zu können, haben wir ein neues Testinstrument, den Freezing-ofgait-Score (FOG-Score) entwickelt, der im klinischen Alltag erprobt wird. Freezing bei Parkinsonpatienten ist meist dopasensitiv, kann aber auch im On-Zustand des Patienten auftreten und ist dann schwer zu therapieren.Wir diskutieren standardisierte Therapieschemata für Patienten mit On-Freezing, die wir an unserem Zentrum entwickelt haben.
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Johnson CE, Ham SW, Ziegler K, Weaver FA, Rowe VL, Han SM. Use of Double Barrel Gore Excluder Bifurcated Endografts for Renal Artery Incorporation in an Urgent Endovascular Repair of A Thoracoabdominal Aortic Aneurysm. Ann Vasc Surg 2017. [DOI: 10.1016/j.avsg.2017.06.011] [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: 10/19/2022]
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Thompson D, Morrice N, Grant L, Le Sommer S, Ziegler K, Whitfield P, Mody N, Wilson HM, Delibegović M. Myeloid protein tyrosine phosphatase 1B (PTP1B) deficiency protects against atherosclerotic plaque formation in the ApoE -/- mouse model of atherosclerosis with alterations in IL10/AMPKα pathway. Mol Metab 2017; 6:845-853. [PMID: 28752048 PMCID: PMC5518727 DOI: 10.1016/j.molmet.2017.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 06/02/2017] [Accepted: 06/06/2017] [Indexed: 12/21/2022] Open
Abstract
Objective Cardiovascular disease (CVD) is the most prevalent cause of mortality among patients with Type 1 or Type 2 diabetes, due to accelerated atherosclerosis. Recent evidence suggests a strong link between atherosclerosis and insulin resistance due to impaired insulin receptor (IR) signaling. Moreover, inflammatory cells, in particular macrophages, play a key role in pathogenesis of atherosclerosis and insulin resistance in humans. We hypothesized that inhibiting the activity of protein tyrosine phosphatase 1B (PTP1B), the major negative regulator of the IR, specifically in macrophages, would have beneficial anti-inflammatory effects and lead to protection against atherosclerosis and CVD. Methods We generated novel macrophage-specific PTP1B knockout mice on atherogenic background (ApoE−/−/LysM-PTP1B). Mice were fed standard or pro-atherogenic diet, and body weight, adiposity (echoMRI), glucose homeostasis, atherosclerotic plaque development, and molecular, biochemical and targeted lipidomic eicosanoid analyses were performed. Results Myeloid-PTP1B knockout mice on atherogenic background (ApoE−/−/LysM-PTP1B) exhibited a striking improvement in glucose homeostasis, decreased circulating lipids and decreased atherosclerotic plaque lesions, in the absence of body weight/adiposity differences. This was associated with enhanced phosphorylation of aortic Akt, AMPKα and increased secretion of circulating anti-inflammatory cytokine interleukin-10 (IL-10) and prostaglandin E2 (PGE2), without measurable alterations in IR phosphorylation, suggesting a direct beneficial effect of myeloid-PTP1B targeting. Conclusions Here we demonstrate that inhibiting the activity of PTP1B specifically in myeloid lineage cells protects against atherosclerotic plaque formation, under atherogenic conditions, in an ApoE−/− mouse model of atherosclerosis. Our findings suggest for the first time that macrophage PTP1B targeting could be a therapeutic target for atherosclerosis treatment and reduction of CVD risk. PTP1B inhibition as therapy for atherosclerosis/cardiovascular disease is proposed. Myeloid-PTP1B mice on ApoE−/− background (ApoE−/−/LysM-PTP1B) were generated. ApoE−/−/LysM-PTP1B had improved glucose homeostasis with no body weight differences. ApoE−/−/LysM-PTP1B had lower lipids and protection against atherosclerotic plaques. Protection was via a PGE2/IL-10/AMPKα mechanism.
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Affiliation(s)
- D Thompson
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK.
| | - N Morrice
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - L Grant
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - S Le Sommer
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - K Ziegler
- Department of Diabetes and Cardiovascular Science, University of the Highlands and Islands, Centre for Health Science, Inverness, UK
| | - P Whitfield
- Department of Diabetes and Cardiovascular Science, University of the Highlands and Islands, Centre for Health Science, Inverness, UK
| | - N Mody
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - H M Wilson
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK
| | - M Delibegović
- Institute of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Aberdeen, UK.
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Brückner U, Tempel M, Ziegler K, Lerzer C, Pfeifer M. Physiotherapeutische Interventionen im prolongierten Weaning (Pro-Wean-Konzept). Pneumologie 2015. [DOI: 10.1055/s-0035-1544877] [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: 10/24/2022]
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Niklasch M, Dreher T, Döderlein L, Wolf SI, Ziegler K, Brunner R, Rutz E. Superior functional outcome after femoral derotation osteotomy according to gait analysis in cerebral palsy. Gait Posture 2015; 41:52-6. [PMID: 25217494 DOI: 10.1016/j.gaitpost.2014.08.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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: 02/13/2014] [Revised: 08/04/2014] [Accepted: 08/18/2014] [Indexed: 02/02/2023]
Abstract
The femoral derotation osteotomy (FDO) is seen as the golden standard treatment in children with cerebral palsy and internal rotation gait. Variable outcomes with cases of over- and undercorrection mainly in the less involved patients have been reported. The determination of the amount of derotation is still inconsistent. 138 patients (age: 11 (± 3.3) years) with cerebral palsy and internal rotation gait were examined pre- and 1 year postoperatively after distal or proximal FDO, using standardized clinical examination and 3D gait analysis. Three groups were defined retrospectively depending on the amount of derotation in relation to the mean hip rotation in stance (MHR) during gait analysis: Group A (derotation angle > MHR + 10°), Group B (derotation angle = MHR ± 10°), Group C (derotation angle <MHR-10°), and compared according to their postoperative mean hip rotation. ANOVA with Bonferroni post hoc test was used for statistics (p < 0.05). Group B had the greatest benefit with the highest rate (86%) of good results (postoperative MHR = ± 15°). In contrast there were 14% cases of overcorrection and 5% cases of deterioration in Group A with only 81% good results and only 79% good results in Group C. It can be concluded, that it is less likely to have unsatisfactory outcomes if the amount of FDO is defined according to the findings of gait analysis compared with clinical examination.
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Affiliation(s)
- M Niklasch
- Pediatric Orthopaedics and Foot Surgery, Clinic for Orthopaedic and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany
| | - T Dreher
- Pediatric Orthopaedics and Foot Surgery, Clinic for Orthopaedic and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany.
| | - L Döderlein
- Orthopaedic Hospital for Children, Behandlungszentrum Aschau GmbH, Bernauerstrasse 18, 83229 Aschau i. Chiemgau, Germany
| | - S I Wolf
- Pediatric Orthopaedics and Foot Surgery, Clinic for Orthopaedic and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany
| | - K Ziegler
- Pediatric Orthopaedics and Foot Surgery, Clinic for Orthopaedic and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany
| | - R Brunner
- Paediatric Orthopaedic Department, University Children's Hospital Basle (UKBB), Spitalstrasse 33, 4056 Basel, Switzerland
| | - E Rutz
- Paediatric Orthopaedic Department, University Children's Hospital Basle (UKBB), Spitalstrasse 33, 4056 Basel, Switzerland
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Ziegler K, Richter K, Schnell B. Über echte Derivate des Diphenyl-styryl-methans. 6. Mitteilung über mehrfach aryl-substituierte Vinylcarbinole und ihre Derivate. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/jlac.19254430107] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Eisenstat DD, Zagozewski J, Ziegler K, Japoni S, Jiang Q, Underhill DA. TRANSCRIPTIONAL REGULATION OF OLIGODENDROGLIAL CELL FATE BY DLX HOMEOBOX GENES: POTENTIAL RELEVANCE TO HISTONE H3.3 MUTATIONS IN PEDIATRIC HIGH GRADE GLIOMA. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou208.10] [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: 11/12/2022] Open
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Agee CB, Wilson NV, McCubbin FM, Ziegler K, Polyak VJ, Sharp ZD, Asmerom Y, Nunn MH, Shaheen R, Thiemens MH, Steele A, Fogel ML, Bowden R, Glamoclija M, Zhang Z, Elardo SM. Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia Northwest Africa 7034. Science 2013; 339:780-5. [DOI: 10.1126/science.1228858] [Citation(s) in RCA: 295] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Kostopoulos P, Walter S, Haass A, Papanagiotou P, Roth C, Yilmaz U, Körner H, Alexandrou M, Viera J, Dabew E, Ziegler K, Schmidt K, Kubulus D, Grunwald I, Schlechtriemen T, Liu Y, Volk T, Reith W, Fassbender K. Mobile stroke unit for diagnosis-based triage of persons with suspected stroke. Neurology 2012; 78:1849-52. [PMID: 22592363 DOI: 10.1212/wnl.0b013e318258f773] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND In this feasibility study, we tested whether prehospital diagnostic stroke workup enables rational decision-making regarding treatment and the target hospital in persons with suspected stroke. METHODS A mobile stroke unit that delivers imaging (including multimodal brain imaging with CT angiography and CT perfusion), point-of-care-laboratory analysis, and neurologic expertise directly at the emergency site was analyzed for its use in prehospital diagnosis-based triage of suspected stroke patients. RESULTS We present 4 complementary cases with suspected stroke who underwent prehospital diagnostic workup that enabled direct diagnosis-based treatment decisions and reliable triage regarding the most appropriate medical facility for that individual, e.g., a primary hospital vs specialized centers of a tertiary hospital. CONCLUSIONS This preliminary report demonstrates the feasibility of prehospital diagnostic stroke workup for immediate etiology-specific decision-making regarding the necessary time-sensitive stroke treatment and the most appropriate target hospital.
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Affiliation(s)
- P Kostopoulos
- Departments of Neurology, Saarland University Hospital, Saarland, Germany
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Collins MJ, Muto A, Feigel A, Goodwin M, Ziegler K, Protack C, Model L, Dardik A. EphB4 activates endothelial nitric oxide synthase to limit vein graft thickening. J Am Coll Surg 2011. [DOI: 10.1016/j.jamcollsurg.2011.06.393] [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: 11/16/2022]
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Model L, Muto A, Kondo Y, Ziegler K, Egbalieh S, Niklason L, Dardik A. Capturing The Identity Changes Of Vein Graft Adaptation: A Novel Arterial Flow Model. J Surg Res 2011. [DOI: 10.1016/j.jss.2010.11.646] [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: 10/18/2022]
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Haberer D, Vyalikh DV, Taioli S, Dora B, Farjam M, Fink J, Marchenko D, Pichler T, Ziegler K, Simonucci S, Dresselhaus MS, Knupfer M, Büchner B, Grüneis A. Tunable band gap in hydrogenated quasi-free-standing graphene. Nano Lett 2010; 10:3360-6. [PMID: 20695447 DOI: 10.1021/nl101066m] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We show by angle-resolved photoemission spectroscopy that a tunable gap in quasi-free-standing monolayer graphene on Au can be induced by hydrogenation. The size of the gap can be controlled via hydrogen loading and reaches approximately 1.0 eV for a hydrogen coverage of 8%. The local rehybridization from sp(2) to sp(3) in the chemical bonding is observed by X-ray photoelectron spectroscopy and X-ray absorption and allows for a determination of the amount of chemisorbed hydrogen. The hydrogen induced gap formation is completely reversible by annealing without damaging the graphene. Calculations of the hydrogen loading dependent core level binding energies and the spectral function of graphene are in excellent agreement with photoemission experiments. Hydrogenation of graphene gives access to tunable electronic and optical properties and thereby provides a model system to study hydrogen storage in carbon materials.
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Affiliation(s)
- D Haberer
- IFW Dresden, PO Box 270116, D-01171 Dresden,Germany
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Häusler SFM, Keller A, Chandran PA, Ziegler K, Zipp K, Heuer S, Krockenberger M, Engel JB, Hönig A, Scheffler M, Dietl J, Wischhusen J. Whole blood-derived miRNA profiles as potential new tools for ovarian cancer screening. Br J Cancer 2010; 103:693-700. [PMID: 20683447 PMCID: PMC2938264 DOI: 10.1038/sj.bjc.6605833] [Citation(s) in RCA: 156] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 06/28/2010] [Accepted: 07/07/2010] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Screening is an unsolved problem for ovarian cancer (OvCA). As late detection is equivalent to poor prognosis, we analysed whether OvCA patients show diagnostically meaningful microRNA (miRNA) patterns in blood cells. METHODS Blood-borne whole miRNome profiles from 24 patients with OvCA and 15 age- and sex-matched healthy controls were biostatistically evaluated. RESULTS Student's t-test revealed 147 significantly deregulated miRNAs before and 4 after Benjamini-Hochberg adjustment. Although these included miRNAs already linked to OvCA (e.g., miR-16, miR-155), others had never before been connected to specific diseases. A bioinformatically calculated miRNA profile allowed for discrimination between blood samples of OvCA patients and healthy controls with an accuracy of >76%. When only cancers of the serous subtype were considered and compared with an extended control group (n=39), accuracy, specificity and sensitivity all increased to >85%. CONCLUSION Our proof-of-principle study strengthens the hypothesis that neoplastic diseases generate characteristic miRNA fingerprints in blood cells. Still, the obtained OvCA-associated miRNA pattern is not yet sensitive and specific enough to permit the monitoring of disease progression or even preventive screening. Microarray-based miRNA profiling from peripheral blood could thus be combined with other markers to improve the notoriously difficult but important screening for OvCA.
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Affiliation(s)
- S F M Häusler
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - A Keller
- Febit Biomed Gmbh,Im Neuenheimer Feld 519, Heidelberg 69120, Germany
- Biomarker Discovery Center Heidelberg, Heidelberg 69120, Germany
| | - P A Chandran
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
- Graduate School for Life Sciences, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - K Ziegler
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - K Zipp
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - S Heuer
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - M Krockenberger
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - J B Engel
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - A Hönig
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - M Scheffler
- Febit Biomed Gmbh,Im Neuenheimer Feld 519, Heidelberg 69120, Germany
| | - J Dietl
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
| | - J Wischhusen
- Department of Obstetrics and Gynaecology, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
- Interdisciplinary Center for Clinical Research, University of Würzburg, School of Medicine, Josef-Schneider-Strasse 4, Würzburg 97080, Germany
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Muto A, Model L, Ziegler K, Eghbalieh SD, Dardik A. Mechanisms of vein graft adaptation to the arterial circulation: insights into the neointimal algorithm and management strategies. Circ J 2010; 74:1501-1512. [PMID: 20606326 PMCID: PMC3662001 DOI: 10.1253/circj.cj-10-0495] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
For patients with coronary artery disease or limb ischemia, placement of a vein graft as a conduit for a bypass is an important and generally durable strategy among the options for arterial reconstructive surgery. Vein grafts adapt to the arterial environment, and the limited formation of intimal hyperplasia in the vein graft wall is thought to be an important component of successful vein graft adaptation. However, it is also known that abnormal, or uncontrolled, adaptation may lead to abnormal vessel wall remodeling with excessive neointimal hyperplasia, and ultimately vein graft failure and clinical complications. Therefore, understanding the venous-specific pathophysiological and molecular mechanisms of vein graft adaptation are important for clinical vein graft management. Of particular importance, it is currently unknown whether there exist several specific distinct molecular differences in the venous mechanisms of adaptation that are distinct from arterial post-injury responses; in particular, the participation of the venous determinant Eph-B4 and the vascular protective molecule Nogo-B may be involved in mechanisms of vessel remodeling specific to the vein. This review describes (1) venous biology from embryonic development to the mature quiescent state, (2) sequential pathologies of vein graft neointima formation, and (3) novel candidates for strategies of vein graft management. Scientific inquiry into venous-specific adaptation mechanisms will ultimately provide improvements in vein graft clinical outcomes.
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Affiliation(s)
- Akihito Muto
- Interdepartmental Program in Vascular Biology and Therapeutics
- the Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT
| | - Lynn Model
- Interdepartmental Program in Vascular Biology and Therapeutics
- the Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT
| | - Kenneth Ziegler
- Interdepartmental Program in Vascular Biology and Therapeutics
- the Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT
| | - Sammy D.D. Eghbalieh
- Interdepartmental Program in Vascular Biology and Therapeutics
- St. Mary's Hospital, Waterbury, CT
| | - Alan Dardik
- Interdepartmental Program in Vascular Biology and Therapeutics
- the Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT
- the VA Connecticut Healthcare System, West Haven, CT
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Coton M, Romano A, Spano G, Ziegler K, Vetrana C, Desmarais C, Lonvaud-Funel A, Lucas P, Coton E. Occurrence of biogenic amine-forming lactic acid bacteria in wine and cider. Food Microbiol 2010; 27:1078-85. [PMID: 20832688 DOI: 10.1016/j.fm.2010.07.012] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 06/08/2010] [Accepted: 07/09/2010] [Indexed: 10/19/2022]
Abstract
A collection of 810 lactic acid bacteria (LAB) strains isolated from wine and cider was screened for potential biogenic amine (BA) producers by combining molecular and phenotypic approaches. A newly developed multiplex PCR method allowed for the simultaneous detection of four genes involved in the production of histamine (histidine decarboxylase, hdc), tyramine (tyrosine decarboxylase, tyrdc) and putrescine (via either ornithine decarboxylase, odc, or agmatine deiminase, agdi) while TLC and HPLC analysis allowed for BA-production determination. One hundred and fifty-eight LAB strains were monitored by the molecular/phenotypic double approach and revealed a good correlation between genotypic and phenotypic data. Eighteen per cent of the tested strains were positive for at least one BA target gene with up to three detected simultaneously, in particular amongst Lactobacillus brevis and Lactobacillus hilgardii isolates for the tyrdc and agdi genes. The most frequent gene corresponded to the agdi gene detected in 112 strains (14% of all LAB strains) of 10 different LAB species. The tyrdc gene was detected in 67 strains represented by 7 different LAB species (8% overall), especially those isolated from wine. Lower levels of hdc(+) (2% of strains) and especially odc(+) (0.5% of strains) strains were observed. Interestingly, species that have never been described to carry BA-producing pathway genes were identified in this study. Furthermore, only one cadaverine-producer was detected and corresponded to Lactobacillus 30a, a collection strain not found in fermented beverages, although cadaverine is commonly detected in wines.
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Affiliation(s)
- M Coton
- ADRIA Normandie, Villers-Bocage, France.
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24
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Wieczorek B, Ziegler K. On optimal estimation of a non-smooth mode in a nonparametric regression model with -mixing errors. J Stat Plan Inference 2010. [DOI: 10.1016/j.jspi.2009.07.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Brügmann E, Sänger R, Ziegler K. Fall 1920. Dtsch Med Wochenschr 2009. [DOI: 10.1055/s-0029-1235281] [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: 10/19/2022]
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26
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Fries P, Ziegler K, Bücker A, Seidel R, Schneider G. Differenzialdiagnose renaler Raumforderungen in der MRT. ROFO-FORTSCHR RONTG 2009. [DOI: 10.1055/s-0029-1221793] [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: 10/20/2022]
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Abstract
The effect of a randomly fluctuating gap, created by a random staggered potential, is studied in a monolayer and a bilayer of graphene. The density of states, the one-particle scattering rate, and the transport properties (diffusion coefficient and conductivity) are calculated at the neutrality point. All of these quantities vanish at a critical value of the average staggered potential, signaling a continuous transition to an insulating behavior. Transport quantities are directly linked to the one-particle scattering rate. Although the behavior is qualitatively the same in mono- and bilayers, the effect of disorder is much stronger in the latter.
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Affiliation(s)
- K Ziegler
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
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28
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Mikhailov SA, Ziegler K. Nonlinear electromagnetic response of graphene: frequency multiplication and the self-consistent-field effects. J Phys Condens Matter 2008; 20:384204. [PMID: 21693812 DOI: 10.1088/0953-8984/20/38/384204] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Graphene is a recently discovered carbon-based material with unique physical properties. This is a monolayer of graphite, and the two-dimensional electrons and holes in it are described by the effective Dirac equation with a vanishing effective mass. As a consequence, the electromagnetic response of graphene is predicted to be strongly nonlinear. We develop a quasi-classical kinetic theory of the nonlinear electromagnetic response of graphene, taking into account the self-consistent-field effects. The response of the system to both harmonic and pulse excitation is considered. The frequency multiplication effect, resulting from the nonlinearity of the electromagnetic response, is studied under realistic experimental conditions. The frequency upconversion efficiency is analyzed as a function of the applied electric field and parameters of the samples. Possible applications of graphene in terahertz electronics are discussed.
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Affiliation(s)
- S A Mikhailov
- Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany
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29
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Ziegler K, Fietzek U, Schroeteler F, Ceballos-Baumann A. Der FOG-Score – Pilotstudie zur Entwicklung eines neuen Instrumentes zur Evaluation von Freezing während des Gehens beim Parkinsonsyndrom. Akt Neurol 2008. [DOI: 10.1055/s-0028-1086998] [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: 10/21/2022]
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30
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Warm M, Kates R, Overkamp F, Zaun S, Ziegler K, Harbeck N. Ergebnisse der Faslodex IPEP zum Einsatz von Fulvestrant unter Alltagsbedingungen –Überprüfung der Sicherheit, Effektivität, Verträglichkeit und Akzeptanz von Fulvestrant beim postmenopausalen Mammakarzinom. Geburtshilfe Frauenheilkd 2008. [DOI: 10.1055/s-0028-1089137] [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: 10/19/2022] Open
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31
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Warm M, Thomas A, Ziegler K, Moers C, Kates R, Harbeck N. Results of the German IPEP study evaluating tolerability, efficacy and acceptance of fulvestrant under routine clinical conditions in advanced breast cancer. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.1092] [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: 11/20/2022] Open
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32
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Ziegler K. Suppression of magnetotransport in strongly disordered graphene. Phys Rev Lett 2008; 100:166801. [PMID: 18518231 DOI: 10.1103/physrevlett.100.166801] [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] [Subscribe] [Scholar Register] [Received: 04/09/2007] [Indexed: 05/26/2023]
Abstract
A tight-binding model with randomly fluctuating atomic positions is studied to discuss the effect of strong disorder in graphene. We employ a strong-disorder expansion for the transport quantities and find a diffusive behavior, where the conductivity is decreasing with increasing disorder. For sufficiently strong disorder the magnetic field drops out of the diffusion coefficient and the conductivity. This signals a strong suppression of magnetotransport effects, a result which is consistent with recent experimental observations by Morozov et al.
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Affiliation(s)
- K Ziegler
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
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33
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Warm M, Thomas A, Ziegler K, Moers C, Kates R, Harbeck N. Results of the German IPEP study evaluating the tolerability, efficacy, and acceptance of fulvestrant (Faslodex(r)) under routine clinical conditions in advanced breast cancer. EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)70582-2] [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: 10/22/2022] Open
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34
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Warm M, Oberhoff C, Ziegler K, Reimer T, Mohrmann S, Schumacher C, Gluz O, Werner F, Zuna I, Nitz U. Second interims analysis of the ARA Plus study – Breast Cancer (BC) adjuvant chemotherapy (CT) with and without darbepoetin alfa (Aranesp®) – Analysis serious adverse events. Geburtshilfe Frauenheilkd 2008. [DOI: 10.1055/s-2008-1075796] [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: 10/21/2022] Open
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35
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Abstract
A new, weakly damped, transverse electromagnetic mode is predicted in graphene. The mode frequency omega lies in the window 1.667<[see text]omega/micro < 2, where micro is the chemical potential, and can be tuned from radio waves to the infrared by changing the density of charge carriers through a gate voltage.
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Affiliation(s)
- S A Mikhailov
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
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36
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Ziegler K, Warm M, Oberhoff C, Reimer T, Mohrmann S, Schumacher C, Gluz O, Nitz U, Zuna I, Werner F. Second interims analysis of the ARA Plus study: Breast Cancer (BC) adjuvant chemotherapy (CT) with and without darbepoetin- alpha, analysis of serious adverse events. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.564] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
564 Background: TAC is one of the most effective regimens. It‘s associated with higher frequency of anemia and chemotherapy-induced neutropenia (CIN). The erythropoiesis stimulating factor (ESF) support of chemotherapy, its complications and survival effect remain unclear. Erythropoetins do prevent chemotherapy-associated anemia (CAA) and subsequent fatigue syndrome but their potential influence on survival is still unclear. One aim of this analysis is to investigate the correlation between CT, growth factor support and toxicity (SAE‘s). Methods: This ARA Plus phase III trial compare chemotherapy ±ARA in breast cancer patients >18 years old, with positive lymph nodes and with M0 disease. Pts get six cycles of of 5-fluoro-uracile 500mg/m2, epirubicine 100mg/m2 and cyclophosphamide 500mg/m2, (FEC, Bonneterre), 3-weekly or six cycles of docetaxcel 75mg/m2, adriamycin 50mg/m2 and cyclophosphamide 500mg/m2, (TAC, BCIRG) and are randomized to ARA 500μg q3w if Hb<13 g/dl or standard support care. Here arte the results. of SAE‘S. Results: A total of 756 pts (373 + ARA/383 -ARA) from 53 sites were enrolled since January 2004, there are 1234 pts. planned up to January 2008. 185 serious adverse events (SAE) are reported. Of these 185 SAE’s 100 (54%) had an ARA-therapy. Most frequent SAE’s were: leucopenia, febrile neutropenia, thrombosis and infections. In 9 (31%) out of the 29 febrile neuropenia SAE’s, ARA was given. 30 thromboses were reported (23+ARA/7-ARA s.) but only 10 at the verty time ARA was given. In 31 severe infections 16 (51,6%; n.s.) were reported in patients receiving ARA Therapy. From 43 patients with intestinal SAE‘s like Diarrhea/Mucositis/Nausea to 30 pts. (69,8 %) ARA eas given. Conclusions: The combination of CT and ARA is safe concerning febrile neutropenia and furthermore appears to be protective factor of this SAE when combined with TAC. There seem to be more SAE‘s concerning thrombosis and intestinal difficulties.These results allow to hypothesize that ARA therapy is associated with higher toxicity concerning thrombosis which could make the use of heparin necessary but on the other side it shows significant reduced neutropenia. No significant financial relationships to disclose.
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Affiliation(s)
- K. Ziegler
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - M. Warm
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - C. Oberhoff
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - T. Reimer
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - S. Mohrmann
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - C. Schumacher
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - O. Gluz
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - U. Nitz
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - I. Zuna
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
| | - F. Werner
- University of Cologne, Cologne, Germany; University of Essen, Essen, Germany; University, Rostock, Germany; University, Duesseldorf, Germany; St. Elisabeth-Krankenhaus Hohenlind, Cologne, Germany
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Abstract
Two-dimensional Dirac fermions are used to discuss quasiparticles in graphene in the presence of impurity scattering. Transport properties are completely dominated by diffusion. This may explain why recent experiments did not find weak localization in graphene. The diffusion coefficient of the quasiparticles decreases strongly with increasing strength of disorder. Using the Kubo formalism, however, we find a robust minimal conductivity that is independent of disorder. This is a consequence of the fact that the change of the diffusion coefficient is fully compensated by a change of the number of delocalized quasiparticle states.
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Affiliation(s)
- K Ziegler
- Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany.
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Ziegler K, Zeiser H. Untersuchungen über alkaliorganische Verbindungen, VII. Mitteil.: Alkalimetallalkyle und Pyridin (Vorläufige Mitteilung). ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19300630736] [Citation(s) in RCA: 107] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Hühns M, Pistorius E, Stephan D, Ziegler K, Lockau W, Broer I. Produktion von biologisch abbaubaren Polymeren in transgenen Pflanzen. CHEM-ING-TECH 2006. [DOI: 10.1002/cite.200650112] [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: 11/11/2022]
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Ziegler K, Görl R, Effing J, Ellermann J, Mappes M, Otten S, Kapp H, Zoellner P, Spaeth D, Smola H. Reduced Cellular Toxicity of a New Silver-Containing Antimicrobial Dressing and Clinical Performance in Non-Healing Wounds. Skin Pharmacol Physiol 2006; 19:140-6. [PMID: 16612141 DOI: 10.1159/000092594] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2005] [Accepted: 07/21/2005] [Indexed: 11/19/2022]
Abstract
Bacterial colonisation of wounds may delay wound healing. Modern silver-containing dressings are antimicrobial, yet cellular toxicity is a serious side-effect. We provide data for a newly formulated silver-containing ointment dressing, Atrauman Ag, for antimicrobial activity and cytotoxicity. Atrauman Ag effectively killed a panel of commensal skin as well as pathogenic bacterial strains while cytotoxicity for HaCaT keratinocytes was only around 10%. With these favourable in vitro tests, Atrauman Ag was analysed in 86 patients with traumatic and non-healing wounds of different aetiologies. The wound state was evaluated for 3 subsequent dressing changes. The slough score was reduced from 59.2 to 35.8%, granulation tissue increased from 27 to 40% and epithelialisation went up from 12.1 to 24%. We conclude that Atrauman Ag has a superior profile of antimicrobial activity over cellular toxicity and the low silver ion release rate may prevent interference with wound-healing mechanisms.
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Affiliation(s)
- K Ziegler
- Paul Hartmann AG, Heidenheim, Germany
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Ziegler K, Dersch F. Untersuchungen über alkali-organische Verbindungen, X. Die präparative bequeme Herstellung des Lithium-benzyls. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.19310640240] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Affiliation(s)
- K. Ziegler
- Chem. Institut d. Universität Heidelberg
| | - K. Bähr
- Chem. Institut d. Universität Heidelberg
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