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Díaz A, Marrero J, Cabrera G, Coto O, Gómez JM. Optimization of nickel and cobalt biosorption by native Serratia marcescens strains isolated from serpentine deposits using response surface methodology. Environ Monit Assess 2022; 194:167. [PMID: 35142917 PMCID: PMC8831376 DOI: 10.1007/s10661-022-09816-w] [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] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 01/22/2022] [Indexed: 05/28/2023]
Abstract
The treatment of metal-polluted wastes is a challenging issue of environmental concern. Metals can be removed using microbial biomass, and this is an interesting approach towards the design of eco-friendly technologies for liquid waste treatment. The study reported here aimed to optimize nickel and cobalt biosorption from aqueous solutions using three native metal-resistant Serratia marcescens strains. Ni(II) and Co(II) biosorption by S. marcescens strains was found to fit better to Langmuir's model, with maximum uptake capacities of 13.5 mg g-1 for Ni(II) ions and 19.9 mg g-1 for Co(II) ions. Different experimental conditions of initial metal concentration, pH, initial biomass, and temperature were optimized using the Plackett-Burman method, and, finally, biomass and metal concentration were studied using the response surface methodology (RSM) to improve biosorption. The optimum uptake capacities for Co(II) ions by the three biosorbents used were obtained for initial metal concentrations of 35-40 mg L-1 and an initial biomass of 6 mg. For Ni(II) ions, the optimum uptake capacity was achieved with 1 mg of initial biomass for S. marcescens C-1 and C-19, and with 7 mg for S. marcescens C-16, with initial concentrations of 20-50 mg L-1. The results obtained demonstrate the viability of native S. marcescens strains as biosorbents for Ni(II) and Co(II) removal. This study also contributes to our understanding of the potential uses of serpentine microbial populations for the design of environmental cleanup technologies.
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Affiliation(s)
- A Díaz
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), Calle 25 #455 Vedado, 10400, La Habana, Cuba
| | - J Marrero
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), Calle 25 #455 Vedado, 10400, La Habana, Cuba
| | - G Cabrera
- Biological and Enzymatic Reactors Group, Department of Chemical Engineering and Food Technology, Faculty of Sciences, 11510, Puerto Real, Cadiz, Spain
| | - O Coto
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), Calle 25 #455 Vedado, 10400, La Habana, Cuba
| | - J M Gómez
- Biological and Enzymatic Reactors Group, Department of Chemical Engineering and Food Technology, Faculty of Sciences, 11510, Puerto Real, Cadiz, Spain.
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Díaz A, Marrero J, Cabrera G, Coto O, Gómez JM. Biosorption of nickel, cobalt, zinc and copper ions by Serratia marcescens strain 16 in mono and multimetallic systems. Biodegradation 2022; 33:33-43. [PMID: 34657229 PMCID: PMC8803796 DOI: 10.1007/s10532-021-09964-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 10/05/2021] [Indexed: 12/18/2022]
Abstract
The metallurgical industry is one of the main sources of heavy metal pollution, which represents a severe threat to life. Metals can be removed from aqueous solutions by using microbial biomasses. This paper analyses the heavy metal biosorption capacity of Serratia marcescens strain 16 in single and multimetallic systems. The results obtained show that Co(II), Ni(II) and Zn(II) biosorption in monometallic systems is two to three times higher than in the presence of bi-metallic and multimetallic solutions. Fourier transform infrared spectroscopy confirmed that carbonyl, carboxyl and hydroxyl were the main functional groups, as well as the amide bands I and II involved in metal uptake, which are present in external structures of the bacterial cell. The results obtained demonstrated the viability of S. marcescens strain 16 as a biosorbent for the design of eco-friendly technologies for the treatment of waste liquor.
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Affiliation(s)
- A Díaz
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), 25th Street #455 Vedado, 10400, La Habana, Cuba
| | - J Marrero
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), 25th Street #455 Vedado, 10400, La Habana, Cuba
| | - G Cabrera
- Biological and Enzymatic Reactors Group, Department of Chemical Engineering and Food Technology, Faculty of Sciences, Puerto Real, 11510, Cádiz, Spain
| | - O Coto
- Metal Biotechnology Laboratory, Faculty of Biology, University of Havana (Cuba), 25th Street #455 Vedado, 10400, La Habana, Cuba
| | - J M Gómez
- Biological and Enzymatic Reactors Group, Department of Chemical Engineering and Food Technology, Faculty of Sciences, Puerto Real, 11510, Cádiz, Spain.
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Marrero J, Coto O, Goldmann S, Graupner T, Schippers A. Recovery of Nickel and Cobalt from Laterite Tailings by Reductive Dissolution under Aerobic Conditions Using Acidithiobacillus Species. Environ Sci Technol 2015; 49:6674-6682. [PMID: 25923144 DOI: 10.1021/acs.est.5b00944] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Biomining of sulfidic ores has been applied for almost five decades. However, the bioprocessing of oxide ores such as laterites lags commercially behind. Recently, the Ferredox process was proposed to treat limonitic laterite ores by means of anaerobic reductive dissolution (AnRD), which was found to be more effective than aerobic bioleaching by fungi and other bacteria. We show here that the ferric iron reduction mediated by Acidithiobacillus thiooxidans can be applied to an aerobic reductive dissolution (AeRD) of nickel laterite tailings. AeRD using a consortium of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans extracted similar amounts of nickel (53-57%) and cobalt (55-60%) in only 7 days as AnRD using Acidithiobacillus ferrooxidans. The economic and environmental advantages of AeRD for processing of laterite tailings comprise no requirement for an anoxic atmosphere, 1.8-fold less acid consumption than for AnRD, as well as nickel and cobalt recovered in a ferrous-based pregnant leach solution (PLS), facilitating the subsequent metal recovery. In addition, an aerobic acid regeneration stage is proposed. Therefore, AeRD process development can be considered as environmentally friendly for treating laterites with low operational costs and as an attractive alternative to AnRD.
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Affiliation(s)
- J Marrero
- †Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany
| | - O Coto
- ‡Laboratory of Metals, Department of Microbiology, University of Havana, Calle 25 e/J e I, Havana, Cuba
| | - S Goldmann
- †Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany
| | - T Graupner
- †Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany
| | - A Schippers
- †Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, 30655 Hannover, Germany
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Bronowicki J, Ye S, Kudo M, Marrero J, Venook A, Nakajima K, Lencioni R. Gideon (Global Investigation of Therapeutic Decisions in Hepatocellular Carcinoma [HCC] and of Its Treatment with Sorafenib [SOR]) 2nd Interim Analysis (IA): Subgroup Analysis by Disease Etiology. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33283-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: 10/25/2022] Open
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Kanwal F, Befeler A, Chari RS, Marrero J, Kahn J, Afdhal N, Morgan T, Roberts L, Mohanty SR, Schwartz J, VanThiel D, Li J, Zeringue A, Di'Bisceglie A. Potentially curative treatment in patients with hepatocellular cancer--results from the liver cancer research network. Aliment Pharmacol Ther 2012; 36:257-65. [PMID: 22670798 DOI: 10.1111/j.1365-2036.2012.05174.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 10/18/2011] [Accepted: 05/15/2012] [Indexed: 12/17/2022]
Abstract
BACKGROUND The extent to which potentially curative therapies are used in patients with hepatocellular cancer (HCC) and their related outcomes are unknown in the US. AIM To determine the rate and outcomes of potentially curative treatment in patients with HCC. METHODS Eleven US centers followed patients with HCC between 2001 and 2007. We determined rates of liver transplantation, surgical resection, or tumour ablation during follow-up, examined differences in adjusted survival of patients receiving these treatments, and determined the factors associated with receipt of potentially curative treatment. RESULTS Of the 267 patients, 76 (28%) patients had early HCC, defined as Child A or B cirrhosis, with a solitary HCC or ≤ 3 nodules, each ≤ 3 cm. Of these, 53 (69.7%) received curative treatment. Thirty six percent of patients with non-early HCC received curative treatment. Compared to patients with non-early HCC who did not receive curative treatment, patients with early HCC and curative treatment had the best survival [hazard ratio, HR = 0.19 (95% CI, 0.08-0.42)] followed by patients with advanced HCC who received curative treatment [HR = 0.37 (95% CI, 0.22-0.64)]. Baseline performance status was significantly associated with receipt of curative treatment as well as survival after adjusting for demographics, clinical characteristics, and HCC stage. CONCLUSIONS In this multicenter database, most of the patients with early HCC received potentially curative treatment. However, only 28% of patients had early HCC. One-third of patients with non-early HCC also underwent curative therapy. Potentially curative treatment improved survival and this effect was seen in patients with early as well as non-early HCC.
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Affiliation(s)
- F Kanwal
- John Cochran VA Medical Center, Saint Louis, MO, USA.
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Geschwind J, Lencioni R, Marrero J, Venook A, Ye S, Nakajima K, Kudo M. Abstract No. 196: Worldwide trends in locoregional therapy (LRT) for hepatocellular carcinoma (HCC): 2nd interim analysis (IA; 1500 patients [pts]) of the GIDEON (global investigation of therapeutic decisions in HCC and of its treatment with sorafenib) study. J Vasc Interv Radiol 2012. [DOI: 10.1016/j.jvir.2011.12.244] [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: 11/25/2022] Open
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Rodríguez-Escudero I, Marrero J, Rodríguez AD. Kallolide A acetate pyrazoline. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o41-2. [PMID: 22259545 PMCID: PMC3254402 DOI: 10.1107/s1600536811051890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Accepted: 12/01/2011] [Indexed: 11/10/2022]
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Lencioni R, Marrero J, Venook A, Ye SL, Kudo M. Design and rationale for the non-interventional Global Investigation of Therapeutic DEcisions in Hepatocellular Carcinoma and Of its Treatment with Sorafenib (GIDEON) study. Int J Clin Pract 2010; 64:1034-41. [PMID: 20642705 PMCID: PMC2905618 DOI: 10.1111/j.1742-1241.2010.02414.x] [Citation(s) in RCA: 62] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is a complicated condition influenced by multiple confounding factors, making optimum patient management extremely challenging. Ethnicity, stage at diagnosis, comorbidities and tumour morphology affect outcomes and vary from region to region, and there is no common language to assess patient prognosis and make treatment recommendations. Despite recent efforts to reduce the incidence of HCC, most patients present with unresectable disease. Non-surgical treatments include ablation, transarterial chemoembolisation and the multikinase inhibitor, sorafenib, but their effects in all patient subgroups are not known and further information is needed to optimise the use of these treatments. AIMS The Global Investigation of Therapeutic DEcisions in Hepatocellular Carcinoma and Of its Treatment with SorafeNib (GIDEON) study (ClinicalTrials.gov identifier NCT00812175; http://clinicaltrials.gov/) is an ongoing global, prospective, non-interventional study of patients with unresectable HCC who are eligible for systemic therapy and for whom the decision has been taken to treat with sorafenib under real-life practice conditions. The aim of this study is to evaluate the safety and efficacy of sorafenib in different subgroups, especially Child-Pugh B where data are limited. DISCUSSION This study will recruit 3000 patients from > 40 countries and follow them for approximately 5 years to compile a large and robust database of information that will be used to analyse local, regional and global differences in baseline characteristics, disease aetiology, treatment practice patterns and treatment outcomes, with a view to improve the knowledge base used to guide physician treatment decisions and to improve patient outcomes.
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Affiliation(s)
- R Lencioni
- Division of Diagnostic Imaging and Intervention, Department of Liver Transplantation, Hepatology and Infectious Diseases, Pisa University School of Medicine, Cisanello Hospital, Pisa, Italy.
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Marrero J, Benítez J, Rodríguez AD, Zhao H, Raptis RG. Bipinnatins K-Q, minor cembrane-type diterpenes from the West Indian Gorgonian Pseudopterogorgia kallos: isolation, structure assignment, and evaluation of biological activities. J Nat Prod 2008; 71:381-389. [PMID: 18271559 DOI: 10.1021/np0705561] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
An extensive chemical study of the secondary metabolites found in the crude organic extract of the gorgonian octocoral Pseudopterogorgia kallos has led to the isolation of seven new cembranolides, bipinnatins K-Q ( 2- 8), and one known compound, bipinnatin E ( 9). The molecular structures of compounds 2- 8, many of which contain unusual structural features, were assigned mainly by 2D NMR spectroscopic methods and X-ray crystallographic analysis. The discovery of compounds 2- 8 may lend support to previously proposed mechanisms for the biosynthesis of recently isolated bioactive natural products from the same gorgonian specimen. The in vitro cytotoxicity of bipinnatins 4, 6, and 7 against the NCI tumor cells MCF breast cancer, NCI-H460 non-small cell lung cancer, and SF-268 CNS cancer was evaluated. However, only bipinnatin Q ( 6) displayed significant cytotoxic activity. Some of the compounds isolated proved to be inhibitors of acetylcholine receptors.
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Marrero J, Ospina CA, Rodríguez AD, Baran P, Zhao H, Franzblau SG, Ortega-Barria E. New diterpenes of the pseudopterane class from two closely related Pseudopterogorgia species: isolation, structural elucidation, and biological evaluation. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.04.070] [Citation(s) in RCA: 10] [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: 10/24/2022]
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Marrero J, Rodríguez AD, Barnes CL. Intricarene, an Unprecedented Trispiropentacyclic Diterpene from the Caribbean Sea Plume Pseudopterogorgia kallos. Org Lett 2005; 7:1877-80. [PMID: 15844929 DOI: 10.1021/ol0505961] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [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: 11/30/2022]
Abstract
[structure: see text] A novel trispiropentacyclic diterpene, intricarene (1), was isolated from the hexane extract of the Caribbean gorgonian octocoral Pseudopterogorgia kallos. Its highly entangled structure was established by interpretation of NMR, IR, UV, and HREIMS data and subsequently confirmed by X-ray diffraction analysis. The unprecedented carbon skeleton of 1 constitutes a new addition to the already impressive architectural diversity of the diterpene class of marine secondary metabolites.
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Affiliation(s)
- Jeffrey Marrero
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346
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Marrero J, Rodríguez AD, Baran P, Raptis RG, Sánchez JA, Ortega-Barria E, Capson TL. Bielschowskysin, a gorgonian-derived biologically active diterpene with an unprecedented carbon skeleton. Org Lett 2005; 6:1661-4. [PMID: 15128261 DOI: 10.1021/ol049495d] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [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: 11/28/2022]
Abstract
Bielschowskysin is a naturally occurring diterpene isolated from the Caribbean gorgonian octocoral Pseudopterogorgia kallos. Its highly oxygenated hexacyclic structure is based on a previously undescribed tricyclo[9.3.0.0(2,10)]tetradecane ring system that was established through spectroscopic analysis and X-ray crystallographic analysis. Bielschowskysin was shown to exhibit antimalarial activity against Plasmodium falciparum as well as strong anticancer activity against two human cancer cell lines.
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Affiliation(s)
- Jeffrey Marrero
- Department of Chemistry, University of Puerto Rico, PO Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346
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Marrero J, Rodríguez A, Baran P, Raptis R. Ciereszkolide: Isolation and Structure Characterization of a Novel Rearranged Cembrane from the Caribbean Sea PlumePseudopterogorgia kallos. European J Org Chem 2004. [DOI: 10.1002/ejoc.200400292] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Marrero J, Rodríguez AD, Baran P, Raptis RG. Isolation and structure of providencin: a highly oxygenated diterpene possessing a unique bicyclo[12.2.0]hexadecane ring system from the sea plume Pseudopterogorgia kallos. Org Lett 2003; 5:2551-4. [PMID: 12841778 DOI: 10.1021/ol034833g] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [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: 11/29/2022]
Abstract
[structure: see text] Providencin (1) is a naturally occurring cytotoxin isolated from the Caribbean gorgonian octocoral Pseudopterogorgia kallos. Its highly oxygenated hexacyclic structure is based on a previously undescribed bicyclo[12.2.0]hexadecane ring system and was established through spectroscopic analysis and X-ray crystallographic analysis. Providencin (1) was shown to exhibit modest anticancer activity against human breast (MCF7), lung (NCI-H460), and CNS (SF-268) cancer cell lines.
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Affiliation(s)
- Jeffrey Marrero
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346
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Marrero J, Rodríguez AD, Baran P, Raptis RG. Isolation and characterization of kallosin A, a novel rearranged pseudopterane diterpenoid from the Caribbean sea plume Pseudopterogorgia kallos (Bielschowsky). J Org Chem 2003; 68:4977-9. [PMID: 12790615 DOI: 10.1021/jo0343329] [Citation(s) in RCA: 15] [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: 11/29/2022]
Abstract
The Caribbean alcyonacean Pseudopterogorgia kallos is shown to contain a novel rearranged pseudopterane diterpene, kallosin A (1), possessing several unusual structural features. In addition to having two distinct 2(3H)- and 2(5H)-furanone moieties, kallosin A is based on a new carbon skeleton. The structural assignment of 1 was based mainly on 1D and 2D NMR spectral data and was further supported by accurate mass measurement and single-crystal X-ray diffraction analysis.
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Affiliation(s)
- Jeffrey Marrero
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, PR 00931-3346, USA
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Abstract
We prepared synthetic hydroxyapatite [HAP; Ca5(PO4)(3-x)(CO3)x(OH)(1+x) (x = 0.3)] and then investigated this material's ability to remove trivalent antimony [Sb(III)] from water. The HAP was characterized by X-ray diffraction analysis, scanning electron microscopy, X-ray energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and infrared spectroscopy. The sorption of Sb(III) to HAP was measured over an Sb(III) concentration range of 0.05-50 mg L(-1), at constant ionic strength (I = 0.01 mol dm(-3)) in equilibrated aqueous suspensions (34 g dm(-3)) for 5 < pH < 8 in vessels that were closed to the atmosphere. Under these conditions, we found that HAP particles were enriched in Ca after incongruent dissolution of the solid. More than 95% of the Sb(III) in solution adsorbed to the solid-phase HAP in <30 min. The equilibrium distribution of Sb(III) (solid vs liquid phase) was characterized by a Langmuir model with gamma(max) = 6.7 +/- 0.1 x 10(-8) mol m(-2) (1.4 +/- 0.2 x 10(-4) mol dm(-3) g(-1)) and K(ads) = 1.5 +/- 0.2 x 10(3) dm3 mol(-1). As Sb adsorption occurred, the pH of the isoelectric point (pH(iep)) of the HAP suspensions declined from 7.7 to 6.9. This finding supports the idea that the negative surface potential of the HAP increased due to the adsorption of Sb as a charged species. The decline in pH(iep) during Sb adsorption plus the thermodynamic description of the Sb(III)-HAP-H2O system suggest likely surface reactions for the interaction of Sb with HAP. We discuss the efficiency of Sb removal from water by HAP in the context of phosphate enrichment.
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Affiliation(s)
- A G Leyva
- Comisión Nacional de Energía Atómica, Unidad de Actividad Fisica, Centro Atómico Constituyentes, San Martin, Argentina
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Magallanes JF, Smichowski P, Marrero J. Optimization and empirical modeling of HG-ICP-AES analytical technique through artificial neural networks. J Chem Inf Comput Sci 2001; 41:824-9. [PMID: 11410064 DOI: 10.1021/ci000337k] [Citation(s) in RCA: 8] [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: 11/30/2022]
Abstract
An artificial neural network technique has been applied to the optimization of a hydride generation-inductively coupled plasma-atomic emission spectrometry (HG-ICP-AES) coupling for the determination of Ge at trace levels. The back propagation of errors net architecture was used. Experimental parameters and their relationship have been studied, obtaining a surface response of the system. The results and optimization aspects achieved with the neural network approach have been compared to the "one variable at time" and SIMPLEX methods.
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Affiliation(s)
- J F Magallanes
- Unidad de Actividad Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. del Libertador 8250, 1429 Buenos Aires, Argentina.
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Matkowskyj KA, Danilkovich A, Marrero J, Savkovic SD, Hecht G, Benya RV. Galanin-1 receptor up-regulation mediates the excess colonic fluid production caused by infection with enteric pathogens. Nat Med 2000; 6:1048-51. [PMID: 10973327 DOI: 10.1038/79563] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [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: 11/08/2022]
Abstract
Galanin is widely distributed in enteric nerve terminals lining the gastrointestinal tract. We previously showed that pathogenic Escherichia coli, but not normal commensal organisms, increase galanin-1 receptor expression by epithelial cells lining the colon (i.e., colonocytes). When present, galanin-1 receptor activation by ligand causes colonocyte Cl- secretion. We herein demonstrate that disparate pathogens including Salmonella typhimurium and Shigella flexerii also increase colonocyte galanin-1 receptor expression, whose activation is responsible for a principal component of the increased colonic fluid secretion observed. Although eliminating the GAL1R gene by homologous recombination does not alter basal colonic fluid secretion, removal of one or both alleles completely attenuates the increase in fluid secretion due to infection with enteric pathogens. Galanin-1 receptor up-regulation therefore represents a novel mechanism accounting for the increased colonic fluid secretion observed in infectious diarrhea due to several different pathogens.
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Affiliation(s)
- K A Matkowskyj
- Department of Medicine, University of Illinois at Chicago and Chicago Veterans Administration Medical Center (West Side Division), Chicago, Illinois 60612, USA
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Abstract
The Vibrio cholerae SXT element encodes resistance to multiple antibiotics and is a conjugative, self-transmissible, and chromosomally integrating element (a constin). Excision and self-transfer of the SXT element require an element-encoded integrase. We now report that the SXT element can also mobilize the plasmids RSF1010 and CloDF13 in trans as well as chromosomal DNA in an Hfr-like manner. SXT element-mediated mobilization of plasmids and chromosomal DNA, unlike its self-transfer, is not dependent upon excision of the element from the chromosome. These results raise the possibility that the SXT element and other constins play a general role in horizontal gene transfer among gram-negative bacteria.
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Affiliation(s)
- B Hochhut
- Division of Geographic Medicine/Infectious Diseases, New England Medical Center and Tufts University School of Medicine, Boston, Massachusetts 02111, USA
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Pan M, Medina A, Suárez de Lezo J, Romero M, Melián F, Pavlovic D, Hernández E, Segura J, Marrero J, Torres F. Follow-up patency of side branches covered by intracoronary Palmaz-Schatz stent. Am Heart J 1995; 129:436-440. [PMID: 7872167 DOI: 10.1016/0002-8703(95)90264-3] [Citation(s) in RCA: 43] [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: 05/22/2023]
Abstract
To assess the risk of late side branch occlusion after Palmaz-Schatz stent deployment, we analyzed the angiographic evolution of 62 patients treated by successful stent implantation who had a total of 85 side branches starting from the stented segment. Side branches were considered minor (n = 39) when the diameter was < 1 mm and intermediate (n = 46) when the vessel had > or = 1 mm diameter. One angiographic follow-up study was available in all patients at 8 +/- 5 months. Eight minor branches presented some degree of stenosis at origin before stent deployment (4 totally occluded). After stent deployment, 32 (82%) of 39 remained unchanged and 3 became occluded. Late progression at origin occurred in 4 of 34 (3 occluded). Before stent deployment, 48% of the intermediate branches had some compromise degree at their starting point (1 totally occluded). Eight of 45 intermediate branches became occluded after stent implantation. Late progression at origin happened in 5 of 32 branches (2 occluded). Some degree of follow-up stenosis regression at the origin was observed in 22 (26%) of 85 arteries. Neither clinical nor angiographic factors could be identified as predictors of late side branch occlusion or stenosis progression at its origin. Later occlusion or progression at origin of a side branch covered by a Palmaz-Schatz stent seems to be an uncommon occurrence (7% and 12% respectively) that cannot be predicted by angiographic or clinical factors. On the contrary, regression at follow-up of a side branch-origin stenosis can also come about.
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Affiliation(s)
- M Pan
- Hospital Reina Sofía, University of Córdoba, Spain
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Medina A, Melián F, Suárez de Lezo J, Pan M, Romero M, Hernández E, Marrero J, Ortega JR, Pavlovic D. Effectiveness of coronary stenting for the treatment of chronic total occlusion in angina pectoris. Am J Cardiol 1994; 73:1222-4. [PMID: 8203345 DOI: 10.1016/0002-9149(94)90188-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- A Medina
- Unidad de Cardiología, Hospital del Pino, University of Las Palmas, Gran Canaria
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Medina A, Suárez de Lezo J, Hernández E, Pan M, Ortega JR, Romero M, Melián F, Pavlovic D, Morales J, Marrero J. Serial angiographic observations after successful directional coronary atherectomy. Am Heart J 1993; 125:1217-21. [PMID: 8480571 DOI: 10.1016/0002-8703(93)90987-k] [Citation(s) in RCA: 7] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This study focuses on the early and late angiographic evolution observed in 82 patients with coronary artery disease who were successfully treated by directional coronary atherectomy (DCA) without adjunctive balloon angioplasty. Qualitative inspections and quantitative measurements were obtained from a selected angled-view projection in the following conditions: (1) before treatment; (2) immediately after treatment; (3) the day after atherectomy; (4) 1 month after; and (5) 6 months after. The appearance of the treated segment 24 hours after the procedure did not differ in 79 patients from that observed immediately after DCA; silent total occlusion occurred in two patients, and one had an aneurysm at the site of resection (all three patients were excluded from the analysis). At the 1-month study restenosis developed in 3 (3.6%) patients; the remaining 76 had identical appearances, with no evidence of renarrowing of the lumen. However, from 1 to 6 months after the procedure restenosis developed in 35 of the remaining 76 (46%) patients, and 41 patients were free of restenosis and symptoms. These findings, which show that early elastic recoil does not occur after successful DCA, are different from the changes observed after balloon angioplasty. At the 1-month observation restenosis is an infrequent but possible phenomenon (3.8%). From this point the healing of the arterial wall leads to no or mild renarrowing (late success); an exaggerated proliferative response produces restenosis.
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Affiliation(s)
- A Medina
- Hospital del Pino, University of Las Palmas, Las Palmas de Gran Canaria, Spain
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Suárez de Lezo J, Romero M, Medina A, Pan M, Pavlovic D, Vaamonde R, Hernández E, Melián F, López Rubio F, Marrero J. Intracoronary ultrasound assessment of directional coronary atherectomy: immediate and follow-up findings. J Am Coll Cardiol 1993; 21:298-307. [PMID: 8425990 DOI: 10.1016/0735-1097(93)90667-p] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.9] [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: 01/30/2023]
Abstract
OBJECTIVES This study was conducted to assess the relations among intracoronary ultrasound, angiographic and histologic data obtained from patients with coronary artery disease successfully treated by directional coronary atherectomy. In addition, it was designed to elucidate whether some aspects of intravascular ultrasound or pathologic findings could predict a propensity to restenosis. BACKGROUND Intracoronary ultrasound is a useful technique in guiding and assessing atherectomy. However, there is little information about the characterization of the different types of coronary plaques and the changes observed in them after resection. Furthermore, the follow-up ultrasound appearance of previously treated lesions remains undepicted. METHODS Fifty-two patients (54 +/- 10 years old) were studied. All were successfully treated by atherectomy with the aid of intracoronary ultrasound guidance. Qualitative and quantitative ultrasound and angiographic variables were derived before and after resection. Quantitative histologic morphometric information was also obtained from the specimens. In 22 patients, a follow-up echoangiographic reevaluation was performed 6 +/- 4 months later. RESULTS Echogenic plaques had a higher collagen and calcium content, whereas echolucent plaques had an increased level of fibrin, nuclei and lipids. Ultrasound plaque reduction after atherectomy was greater in echolucent (76 +/- 21%) than in echogenic plaques (60 +/- 18%; p < 0.05). That reduction correlated with the weight of the resected material (r = 0.62; p < 0.01). At follow-up study, 13 of 22 patients had angiographic and ultrasound evidence of restenosis. Most recurrent lesions had a stenotic three-layer appearance. The incidence of restenosis of primary lesions treated with atherectomy was higher in echolucent (100%) than in echogenic (33%) plaques. Similarly, a higher proportion of nuclear content in the resected material was observed in patients who developed restenosis (2.1 +/- 0.7%) than in patients who had late success after atherectomy (1.2 +/- 0.6%). CONCLUSIONS Our findings suggest that echolucent plaques are easier to resect than are echogenic plaques but frequently develop restenosis. In contrast, the resection of echogenic plaques, although often incomplete, is associated with better long-term results.
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Pan M, Medina A, Romero M, Suárez de Lezo J, Hernández E, Pavlovic D, Melián F, Marrero J, Cabrera JA. Peripheral stent recovery after failed intracoronary delivery. Cathet Cardiovasc Diagn 1992; 27:230-3. [PMID: 1423581 DOI: 10.1002/ccd.1810270316] [Citation(s) in RCA: 22] [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] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The Palmaz-Schatz stent can be successfully deployed in most patients. However, in a small percentage of instances a systemic embolism of the stent has been reported. In the present article we describe an easy and fast method of stent capture when detachment from the balloon has happened (pulling back the stent-loaded balloon into the guiding catheter or femoral sheath). In this situation we propose the use of the coronary guide-wire "as a guide" to capture coaxially the lost stent. This method allows for continuing the procedure without removal of the femoral sheath.
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Affiliation(s)
- M Pan
- Hospital Reina Sofía, University of Córdoba, Spain
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Medina A, Hernácuteandez E, Suácutearez de Lezo J, Pan M, Meliácutean F, Romero M, Marrero J, Irurita M, Pavlovic D. Divided Palmaz-Schatz stent for discrete coronary stenosis. J Invasive Cardiol 1992; 4:389-92. [PMID: 10147841] [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: 02/11/2023]
Abstract
This article shows the findings observed in a group of 7 patients with short coronary lesions who were treated by a divided (7 mm length) coronary Palmaz-Schatz stent, in trying to match the length of the stent to that of the treated segment. All of the patients were male and had a mean age of 59 +/- 5 years; 6 had unstable and 1 stable angina. The angiographic length of the lesion was 4.3 +/- 1 mm. The divided stent was successfully deployed in all cases and remained in place without complications. The clinical condition stabilized and all 7 patients were symptom-free 6 months post-hospital discharge. At angiographic follow-up studies, performed before discharge and at 2 and 6 months later, there were no significant changes in the resultant minimal lumen diameter. The stented segment and surrounding areas remained smooth and without intraluminal defects. These observations suggest that a 7 mm length stent is effective in avoiding elastic recoil of discrete coronary lesions. This reduced length could be helpful in: 1) decreasing exposed metallic surface, 2) increasing deliverability and 3) preventing the origin of nearby side-branches to be covered by a standard 15 mm length stent.
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Affiliation(s)
- A Medina
- Hospital del Pino, University of Las Palmas, Las Palmas de Gran Canaria, Spain
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26
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Hernández E, Suárez de Lezo J, Medina A, Pan M, Melián F, Romero M, Marrero J, Ortega JR, Pavlovic D, Morales J. [Follow-up study after percutaneous mitral valvuloplasty. The COR-PAL experience]. Rev Esp Cardiol 1992; 45:498-505. [PMID: 1470738] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mitral balloon valvulotomy has proven to be an effective method for the treatment of patients with mitral stenosis. Although several factors determining an optimal immediate result have been described, there is few information regarding the longterm follow-up as well as factors influencing late success after the procedure. In this article, we analyzed our series of 311 patients treated by mitral balloon valvulotomy who were clinically followed between 3 months and 5 years (mean 23 +/- 11 months). At least, one echo-Doppler follow-up study was obtained in 260 patients, 20 +/- 10 months after. Hemodynamic re-evaluations were performed in 63 patients after 20 +/- 11 months. Late success was defined as the patient being in functional class I-II and free of major events (death, restenosis or valve surgery). Restenosis was defined as the loss of 50% of initial gain in terms of valve area, confirmed always hemodynamically. Major events during follow-up period occurred in 19 patients (10 deaths, 8 restenosis and 11 mitral valve surgery). We performed a multivariate study using the Cox-regression model. In the analysis, all variables with or near statistic significance in the univariate analysis (Mantel-Haezel) were included. The only significant independent predictors of late success were the presence of sinus rhythm (p < 0.04) and the absence of calcium at the valve (p < 0.001). In conclusion, the best results 5 years after mitral balloon valvulotomy are observed in patients with non calcified valve and sinus rhythm.
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Affiliation(s)
- E Hernández
- Unidad de Cardiología, Hospital Nuestra Señora del Pino, Las Palmas
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Marrero J. [Nursing education and service]. Bol Col Prof Enferm P R 1976; 2:26. [PMID: 1066135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Marrero J. [Inservice education for nursing faculty]. P R Enferm 1969; 44:10-5. [PMID: 5256400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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