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Wystrach A, Schwarz S. Ants use a predictive mechanism to compensate for passive displacements by wind. Curr Biol 2014; 23:R1083-5. [PMID: 24355779 DOI: 10.1016/j.cub.2013.10.072] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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102
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Schwarz S, Suppan M, Höbling W, Grünberger A, Nömeyer R, Hubner D, Knoflach P. [Non-cirrhotic portal hypertension presented by acute upper gastrointestinal bleeding 7 years after oxaliplatin-chemotherapy]. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2014; 52:654-656. [PMID: 25026007 DOI: 10.1055/s-0034-1366415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
After having received adjuvant FOLFOX treatment consisting of oxaliplatin, folinic acid and fluoruracil following hemicolectomy in colon cancer 7 years ago, the findings of non-cirrhotic portal hypertension presented by acute upper gastrointestinal bleeding in a 49-year old woman were interpreted as oxaliplatin-associated. Imaging techniques, hepatic venous pressure measurement and liver biopsy supported pre-sinusoidal damage due to NRH (nodular regenerative hyperplasia) as the underlying cause, even though histological findings were moderate. Following primary endoscopic treatment, a stable condition has thus far been achievable with standard drug therapy.
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Sauter D, Schwarz S, Wang K, Zhang R, Sun B, Schwarz W. Genistein as antiviral drug against HIV ion channel. PLANTA MEDICA 2014; 80:682-687. [PMID: 24963618 DOI: 10.1055/s-0034-1368583] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Various drugs found in Chinese herbs are well known for their antiviral potency. We have tested several flavonoids with respect to their potency to block the viral protein U of the human immunodeficiency type 1 virus, which is believed to form a cation-permeable ion channel in the infected cell. We used Xenopus oocytes with heterologously expressed viral protein U as model system to test the efficacy of the drugs in voltage-clamp experiments. This method had been demonstrated in the past as a useful tool to screen drugs for their potency in inhibition of ion channel activity. The viral protein U-mediated current could be inhibited by Ba(2+) with a K1/2 value of 1.6 mM. Therefore, we determined viral protein U-mediated current as current component blocked by 10 mM Ba(2+). We screened several flavonoids with respect to their effects on this current. The flavonols quercetin and kaempferol, and the flavanols (-)epigallochatechin and (-)epichatechin were ineffective. The flavanone naringenin showed at 20 µM slight (about 10%) inhibition. The most potent drug was the isoflavon genistein which exhibited at 20 µM significant inhibition of about 40% with a K1/2 value of 81 ± 4 µM. We suggest that viral ion channels, in general, may be a good target for development of antiviral agents, and that, in particular, isoflavons may be candidates for development of drugs targeting viral protein U.
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Stölzel K, Schulze-Tanzil G, Olze H, Schwarz S, Feldmann EM, Rotter N. Immortalised human mesenchymal stem cells undergo chondrogenic differentiation in alginate and PGA/PLLA scaffolds. Cell Tissue Bank 2014; 16:159-70. [PMID: 24832181 DOI: 10.1007/s10561-014-9457-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 05/07/2014] [Indexed: 01/16/2023]
Abstract
Adult mesenchymal stem cells (MSCs) are a promising cell source in tissue engineering due to their availability, ease of isolation and high proliferative activity. This study was undertaken to investigate whether immortalised human MSC are able to undergo chondrogenic differentiation when cultured in alginate or in resorbable scaffolds. We directly compared chondrogenesis MSCs with that of human nasoseptal chondrocytes. Two previously established human stem cell lines L87/4 and V54-2 immortalised using the SV40 large T-antigen were either cultured in alginate or in polyglycolic acid/poly-L-lactic acid (PGA/PLLA) (90/10) copolymer scaffolds. TGF-β1 was added for induction of chondrogenesis. Human nasoseptal chondrocytes and human fibroblasts were used as controls. Cultures were analysed for sulfated glycosaminoglycans (alcian blue staining) and for the presence of collagen type I, II and X (immunolabelling). SV40 large T-antigen immortalised human MSCs have the potential to undergo chondrogenic differentiation: After 21 days, cartilage-specific type II collagen was present in alginate and PGA/PLLA scaffolds, independent of the addition of TGF-β1. Collagen type X was present in monolayer cultures as well as in alginate and PGA/PLLA scaffolds. Collagen type I was produced in marginal amounts only. Immortalised human MSCs are a suitable tool to study chondrogenesis in vitro and to screen biomaterials for cartilage tissue engineering applications.
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105
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Wendlandt S, Li J, Ho J, Porta MA, Fessler AT, Wang Y, Kadlec K, Monecke S, Ehricht R, Boost M, Schwarz S. Enterococcal multiresistance gene cluster in methicillin-resistant Staphylococcus aureus from various origins and geographical locations. J Antimicrob Chemother 2014; 69:2573-5. [DOI: 10.1093/jac/dku137] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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106
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Abstract
Physical exercise has been recognized as a standard therapy in the guidelines for secondary prevention of chronic heart failure. This is mostly due to the overwhelming scientific evidence, including meta-analyses that have illustrated the positive effect of physical exercise on quality of life, hospitalisation and exercise capacity. However, it is crucial that patients undergo thorough clinical screening, including exercise testing, before starting an exercise regimen. Once a patient is eligible to exercise, it is also important that only approved exercise regimens are prescribed and that the exercise itself is monitored appropriately. Both, traditional moderate continuous endurance training and recently developed interval training have been shown to be safe and effective in chronic heart failure. Ideally, moderate intensity training should be started and later combined with interval training that is added by moderate resistance training in order to improve quality of life and prognosis.
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Harvey CM, Gottipati R, Schwarz S, Auer D, O'Donoghue M, Russell NH, Fox CP. Acute disseminated encephalomyelitis following allo-SCT: central nervous system manifestation of GVHD. Bone Marrow Transplant 2014; 49:854-6. [PMID: 24637899 DOI: 10.1038/bmt.2014.29] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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108
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Benz A, Krall M, Schwarz S, Dietze D, Detz H, Andrews AM, Schrenk W, Strasser G, Unterrainer K. Resonant metamaterial detectors based on THz quantum-cascade structures. Sci Rep 2014; 4:4269. [PMID: 24608677 PMCID: PMC3948069 DOI: 10.1038/srep04269] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 02/13/2014] [Indexed: 11/09/2022] Open
Abstract
We present the design, fabrication and characterisation of an intersubband detector employing a resonant metamaterial coupling structure. The semiconductor heterostructure relies on a conventional THz quantum-cascade laser design and is operated at zero bias for the detector operation. The same active region can be used to generate or detect light depending on the bias conditions and the vertical confinement. The metamaterial is processed directly into the top metal contact and is used to couple normal incidence radiation resonantly to the intersubband transitions. The device is capable of detecting light below and above the reststrahlenband of gallium-arsenide corresponding to the mid-infrared and THz spectral region.
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Ma yszko I, Schwarz S, Hauschild T. Detection of a new mecC allotype, mecC2, in methicillin-resistant Staphylococcus saprophyticus. J Antimicrob Chemother 2014; 69:2003-5. [DOI: 10.1093/jac/dku043] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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110
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Schwarz S, Georgiadis D, Schwab S, Aschoff A, Hacke W. Aktuelle Konzepte der Intensivtherapie des raumfordernden Mediainfarkts. DER NERVENARZT 2014; 73:508-18. [PMID: 12242997 DOI: 10.1007/s00115-002-1302-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this paper is to review new developments in the intensive care of patients with space-occupying middle cerebral artery infarctions. Elevated blood pressure should not be treated; however, there is no scientific basis to induce arterial hypertension in these patients. It is not recommended generally to nurse the patients in a position with the head elevated. If therapy is targeted for an optimum cerebral perfusion pressure, the patients should be nursed in a flat position. Decompressive surgery is associated with a marked reduction in an otherwise high mortality. The functional outcome after surgery is similar to the outcome of the survivors after conventional treatment alone. Treatment options for an acutely raised intracranial pressure are mannitol or hypertonic saline solutions, although the long-term effects have not been ascertained yet. There is not enough evidence supporting a prophylactic standard therapy with hypertonic solutions. Patients who require artificial ventilation can be safely ventilated using PEEP or an inverse inspiration/expiration ratio, if the blood pressure is monitored and a possible drop of the arterial blood pressure is treated. Corticoids and hemodilution are obsolete therapies in these patients.
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111
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Schwarz S, Wetterling T. Alkohol und Schlaganfall Wirkt gering-mäßiger Konsum protektiv? DER NERVENARZT 2014; 73:719-28. [PMID: 12242958 DOI: 10.1007/s00115-002-1331-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
It is now increasingly recognized that mild to moderate consumption of alcohol is associated with reduced mortality and coronary heart disease. Alcohol consumption and mortality follows a J-shaped association, with increasing mortality in heavy drinkers. There is some evidence from epidemiological studies that mild to moderate alcohol consumption may also reduce the risk of ischemic stroke and overall stroke in persons over 40 years of age. However, these studies have been criticized for not adequately considering possible confounding factors. Moreover, alcohol consumption is associated with an increased risk of intracerebral and sub-arachnoid hemorrhage, and binge drinking is a strong risk factor for both ischemic and hemorrhagic stroke. Alcohol consumption probably has no beneficial effects in young subjects. On the basis of the current evidence, it is not justified to advise an otherwise healthy, mild to moderate consumer of alcoholic beverages to quit drinking. However, it seems premature to advise alcohol consumption generally for prevention of stroke.
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Schwarz S, Sauter D, Wang K, Zhang R, Sun B, Karioti A, Bilia AR, Efferth T, Schwarz W. Kaempferol derivatives as antiviral drugs against the 3a channel protein of coronavirus. PLANTA MEDICA 2014; 80:177-82. [PMID: 24458263 PMCID: PMC7171712 DOI: 10.1055/s-0033-1360277] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The protein coded by the open-reading-frame 3a of SARS coronavirus has been demonstrated to form a cation-selective channel that may become expressed in the infected cell. The activity of the channel is involved in the mechanism of virus release. Drugs that inhibit the ion channel can, therefore, inhibit virus release, and they could be a source for development of novel therapeutic antiviral agents. Various drugs found in Chinese herbs that are well known as anticancer agents also have an antiviral potency. Here we tested the flavonols kaempferol, kaempferol glycosides, and acylated kaempferol glucoside derivatives with respect to their potency to block the 3a channel. We used the Xenopus oocyte with a heterologously expressed 3a protein as a model system to test the efficacy of the flavonols. Some of these drugs turned out to be potent inhibitors of the 3a channel. The most effective one was the glycoside juglanin (carrying an arabinose residue) with an IC50 value of 2.3 µM for inhibition of the 3a-mediated current. Kaempferol derivatives with rhamnose residue also seem to be quite effective. We suggest that viral ion channels, in general, may be a good target for the development of antiviral agents, and that, in particular, kaempferol glycosides are good candidates for 3a channel proteins of coronaviruses.
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113
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Lapierre A, Schwarz S, Baumann TM, Cooper K, Kittimanapun K, Rodriguez AJ, Sumithrarachchi C, Williams SJ, Wittmer W, Leitner D, Bollen G. First charge breeding of a rare-isotope beam with the electron-beam ion trap of the ReA post-accelerator at the National Superconducting Cyclotron Laboratory. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02B701. [PMID: 24593600 DOI: 10.1063/1.4827308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An electron-beam ion trap (EBIT) charge breeder is being brought into operation at the National Superconducting Cyclotron Laboratory at Michigan State University. The EBIT is part of the ReA post-accelerator for reacceleration of rare isotopes, which are thermalized in a gas "stopping" cell after being produced at high energy by projectile fragmentation. The ReA EBIT has a distinctive design; it is characterized by a high-current electron gun and a two-field superconducting magnet to optimize the capture and charge-breeding efficiency of continuously injected singly charged ion beams. Following a brief overview of the reaccelerator system and the ReA EBIT, this paper presents the latest commissioning results, particularly, charge breeding and reacceleration of the highly charged rare isotopes, (76)Ga(24 +, 25 +).
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Schwarz S, Baumann TM, Kittimanapun K, Lapierre A, Snyder A. A high-current electron gun for the electron beam ion trap at the National Superconducting Cyclotron Laboratory. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02B705. [PMID: 24593604 DOI: 10.1063/1.4827109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The Electron Beam Ion Trap (EBIT) in NSCL's reaccelerator ReA uses continuous ion injection and accumulation. In order to maximize capture efficiency and minimize breeding time into high charge states, the EBIT requires a high-current/high current-density electron beam. A new electron gun insert based on a concave Ba-dispenser cathode has been designed and built to increase the current transmitted through the EBIT's superconducting magnet. With the new insert, stable EBIT operating conditions with 0.8 A of electron beam have been established. The design of the electron gun is presented together with calculated and measured perveance data. In order to assess the experimental compression of the electron beam, a pinhole CCD camera has been set up to measure the electron beam radius. The camera observes X-rays emitted from highly charged ions, excited by the electron beam. Initial tests with this camera setup will be presented. They indicate that a current density of 640 A/cm(2) has been reached when the EBIT magnet was operated at 4 T.
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Schwarz S, Csuk R, Rauter AP. Microwave-assisted synthesis of novel purine nucleosides as selective cholinesterase inhibitors. Org Biomol Chem 2014; 12:2446-56. [DOI: 10.1039/c4ob00142g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A series of new purine nucleosides bearingd-glucosyl,d-mannosyl andd-galactosyl groups was synthesized. Selective inhibition of butyryl- or acetylcholinesterase could be tuned by purine substitution and glycosyl moiety. The 2-acetamidopurine nucleoside exhibiting ad-mannosyl group, α-configuration and N7-ligation was the most active and selective competitive inhibitor of butyrylcholinesterase.
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Sercombe D, Schwarz S, Del Pozo-Zamudio O, Liu F, Robinson BJ, Chekhovich EA, Tartakovskii II, Kolosov O, Tartakovskii AI. Optical investigation of the natural electron doping in thin MoS2 films deposited on dielectric substrates. Sci Rep 2013; 3:3489. [PMID: 24336152 PMCID: PMC3860010 DOI: 10.1038/srep03489] [Citation(s) in RCA: 132] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 11/27/2013] [Indexed: 12/23/2022] Open
Abstract
Two-dimensional (2D) compounds provide unique building blocks for novel layered devices and hybrid photonic structures. However, large surface-to-volume ratio in thin films enhances the significance of surface interactions and charging effects requiring new understanding. Here we use micro-photoluminescence (PL) and ultrasonic force microscopy to explore the influence of the dielectric environment on optical properties of a few monolayer MoS2 films. PL spectra for MoS2 films deposited on SiO2 substrates are found to vary widely. This film-to-film variation is suppressed by additional capping of MoS2 with SiO2 and Si(x)N(y), improving mechanical coupling of MoS2 with surrounding dielectrics. We show that the observed PL non-uniformities are related to strong variation in the local electron charging of MoS2 films. In completely encapsulated films, negative charging is enhanced leading to uniform optical properties. Observed great sensitivity of optical characteristics of 2D films to surface interactions has important implications for optoelectronics applications of layered materials.
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117
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Liu Y, Wang Y, Schwarz S, Wang S, Chen L, Wu C, Shen J. Investigation of a multiresistance gene cfr that fails to mediate resistance to phenicols and oxazolidinones in Enterococcus faecalis. J Antimicrob Chemother 2013; 69:892-8. [DOI: 10.1093/jac/dkt459] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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118
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Gómez-Sanz E, Zarazaga M, Kadlec K, Schwarz S, Torres C. Chromosomal integration of the novel plasmid pUR3912 from methicillin-susceptible Staphylococcus aureus ST398 of human origin. Clin Microbiol Infect 2013; 19:E519-22. [DOI: 10.1111/1469-0691.12279] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Revised: 05/22/2013] [Accepted: 05/22/2013] [Indexed: 11/30/2022]
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119
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Weiss S, Kadlec K, Fessler AT, Schwarz S. Complete sequence of a multiresistance plasmid from a methicillin-resistant Staphylococcus epidermidis ST5 isolated in a small animal clinic. J Antimicrob Chemother 2013; 69:847-59. [DOI: 10.1093/jac/dkt399] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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120
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Fessler AT, Calvo N, Gutierrez N, Munoz Bellido JL, Fajardo M, Garduno E, Monecke S, Ehricht R, Kadlec K, Schwarz S. Cfr-mediated linezolid resistance in methicillin-resistant Staphylococcus aureus and Staphylococcus haemolyticus associated with clinical infections in humans: two case reports. J Antimicrob Chemother 2013; 69:268-70. [DOI: 10.1093/jac/dkt331] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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121
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Khan C, Schwarz S, Conrad S, Koltermann K, Dippmann A, Ollenschlaeger G. P210 Changes In Performance Of The Adaptation Methodology Used For Guideline Development From 2002 To 2012. BMJ Qual Saf 2013. [DOI: 10.1136/bmjqs-2013-002293.208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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122
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Wendlandt S, Kadlec K, Fessler AT, Monecke S, Ehricht R, van de Giessen AW, Hengeveld PD, Huijsdens X, Schwarz S, van Duijkeren E. Resistance phenotypes and genotypes of methicillin-resistant Staphylococcus aureus isolates from broiler chickens at slaughter and abattoir workers. J Antimicrob Chemother 2013; 68:2458-63. [DOI: 10.1093/jac/dkt239] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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123
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Schink AK, Kadlec K, Kaspar H, Mankertz J, Schwarz S. Analysis of extended-spectrum- -lactamase-producing Escherichia coli isolates collected in the GERM-Vet monitoring programme. J Antimicrob Chemother 2013; 68:1741-9. [DOI: 10.1093/jac/dkt123] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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124
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Rensch U, Klein G, Schwarz S, Kaspar H, de Jong A, Kehrenberg C. Comparative analysis of the susceptibility to triclosan and three other biocides of avian Salmonella enterica isolates collected 1979 through 1994 and 2004 through 2010. J Food Prot 2013; 76:653-6. [PMID: 23575128 DOI: 10.4315/0362-028x.jfp-12-420] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Few studies have been conducted on changes in the susceptibility of bacteria due to long-term use of biocides. A total of 375 avian Salmonella isolates collected in Germany from healthy or diseased animals during two time periods, 1979 through 1994 and 2004 through 2010, were included in the present study. The isolates were tested for their MICs of triclosan, acriflavine, benzalkonium chloride, and chlorhexidine by broth macrodilution. MIC50, MIC90, and the distribution of MICs were compared. The MIC ranges were 0.0625 to 0.5 μg/ml for triclosan, 16 to 256 μg/ml for acriflavine, 8 to 128 μg/ml for benzalkonium chloride, and 0.5 to 32 μg/ml for chlorhexidine. MIC50s and MIC90s were equal or differed by not more than one dilution step. For isolates from healthy poultry collected during the two time periods, statistical analysis revealed a significant increase only in MICs for chlorhexidine. Salmonellae from diseased birds were more susceptible to triclosan and benzalkonium chloride but less susceptible to acriflavine and chlorhexidine. Overall, only 25 strains had the highest detected MIC of 0.5 μg/ml triclosan, but an association with multidrug resistance could not be confirmed.
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125
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Shen J, Wang Y, Schwarz S. Presence and dissemination of the multiresistance gene cfr in Gram-positive and Gram-negative bacteria. J Antimicrob Chemother 2013; 68:1697-706. [DOI: 10.1093/jac/dkt092] [Citation(s) in RCA: 199] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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