LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 3375

Search options

  1. Article ; Online: Disinfectant use by K-12 school staff to combat SARS-CoV-2.

    Hilbert, Timothy J / Brancato, Candace / Carter, Kelsey / Westneat, Susan / Bush, Heather M / Haynes, Erin N

    American journal of infection control

    2021  Volume 49, Issue 11, Page(s) 1432–1434

    Abstract: K-12 school staff from Indiana, Kentucky and Ohio were asked about their use of disinfectants ...

    Abstract K-12 school staff from Indiana, Kentucky and Ohio were asked about their use of disinfectants to mitigate the spread of COVID-19 in schools. Survey participants (n = 1,555) reported frequent use of disinfectants, often using unknown products, and were provided little to no training on safe and effective use. Participant concerns included student involvement in disinfection, inadequate ventilation, surface contact time, and potential health effects.
    MeSH term(s) COVID-19 ; Disinfectants ; Disinfection ; Humans ; SARS-CoV-2 ; Schools
    Chemical Substances Disinfectants
    Language English
    Publishing date 2021-08-27
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 392362-9
    ISSN 1527-3296 ; 0196-6553
    ISSN (online) 1527-3296
    ISSN 0196-6553
    DOI 10.1016/j.ajic.2021.08.023
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Acid-adapted strains of Escherichia coli K-12 obtained by experimental evolution.

    Harden, Mark M / He, Amanda / Creamer, Kaitlin / Clark, Michelle W / Hamdallah, Issam / Martinez, Keith A / Kresslein, Robert L / Bush, Sean P / Slonczewski, Joan L

    Applied and environmental microbiology

    2015  Volume 81, Issue 6, Page(s) 1932–1941

    Abstract: ... experimental evolution of Escherichia coli K-12 to isolate clones with increased fitness during growth under ... acidic conditions (pH 4.5 to 4.8). Twenty-four independent populations of E. coli K-12 W3110 were evolved ...

    Abstract Enteric bacteria encounter a wide range of pHs throughout the human intestinal tract. We conducted experimental evolution of Escherichia coli K-12 to isolate clones with increased fitness during growth under acidic conditions (pH 4.5 to 4.8). Twenty-four independent populations of E. coli K-12 W3110 were evolved in LBK medium (10 g/liter tryptone, 5 g/liter yeast extract, 7.45 g/liter KCl) buffered with homopiperazine-N,N'-bis-2-(ethanosulfonic acid) and malate at pH 4.8. At generation 730, the pH was decreased to 4.6 with HCl. By 2,000 generations, all populations had achieved higher endpoint growth than the ancestor at pH 4.6 but not at pH 7.0. All evolving populations showed a progressive loss of activity of lysine decarboxylase (CadA), a major acid stress enzyme. This finding suggests a surprising association between acid adaptation and moderation of an acid stress response. At generation 2,000, eight clones were isolated from four populations, and their genomes were sequenced. Each clone showed between three and eight missense mutations, including one in a subunit of the RNA polymerase holoenzyme (rpoB, rpoC, or rpoD). Missense mutations were found in adiY, the activator of the acid-inducible arginine decarboxylase (adiA), and in gcvP (glycine decarboxylase), a possible acid stress component. For tests of fitness relative to that of the ancestor, lacZ::kan was transduced into each strain. All acid-evolved clones showed a high fitness advantage at pH 4.6. With the cytoplasmic pH depressed by benzoate (at external pH 6.5), acid-evolved clones showed decreased fitness; thus, there was no adaptation to cytoplasmic pH depression. At pH 9.0, acid-evolved clones showed no fitness advantage. Thus, our acid-evolved clones showed a fitness increase specific to low external pH.
    MeSH term(s) Acids/toxicity ; Adaptation, Biological ; Culture Media/chemistry ; Drug Resistance, Bacterial ; Escherichia coli K12/drug effects ; Escherichia coli Proteins/genetics ; Escherichia coli Proteins/metabolism ; Hydrogen-Ion Concentration ; Mutation, Missense
    Chemical Substances Acids ; Culture Media ; Escherichia coli Proteins
    Language English
    Publishing date 2015-03
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 223011-2
    ISSN 1098-5336 ; 0099-2240
    ISSN (online) 1098-5336
    ISSN 0099-2240
    DOI 10.1128/AEM.03494-14
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Benzoate- and Salicylate-Tolerant Strains of Escherichia coli K-12 Lose Antibiotic Resistance during Laboratory Evolution.

    Creamer, Kaitlin E / Ditmars, Frederick S / Basting, Preston J / Kunka, Karina S / Hamdallah, Issam N / Bush, Sean P / Scott, Zachary / He, Amanda / Penix, Stephanie R / Gonzales, Alexandra S / Eder, Elizabeth K / Camperchioli, Dominic W / Berndt, Adama / Clark, Michelle W / Rouhier, Kerry A / Slonczewski, Joan L

    Applied and environmental microbiology

    2016  Volume 83, Issue 2

    Abstract: Escherichia coli K-12 W3110 grows in the presence of membrane-permeant organic acids ...

    Abstract Escherichia coli K-12 W3110 grows in the presence of membrane-permeant organic acids that can depress cytoplasmic pH and accumulate in the cytoplasm. We conducted experimental evolution by daily diluting cultures in increasing concentrations of benzoic acid (up to 20 mM) buffered at external pH 6.5, a pH at which permeant acids concentrate in the cytoplasm. By 2,000 generations, clones isolated from evolving populations showed increasing tolerance to benzoate but were sensitive to chloramphenicol and tetracycline. Sixteen clones grew to stationary phase in 20 mM benzoate, whereas the ancestral strain W3110 peaked and declined. Similar growth occurred in 10 mM salicylate. Benzoate-evolved strains grew like W3110 in the absence of benzoate, in media buffered at pH 4.8, pH 7.0, or pH 9.0, or in 20 mM acetate or sorbate at pH 6.5. Genomes of 16 strains revealed over 100 mutations, including single-nucleotide polymorphisms (SNPs), large deletions, and insertion knockouts. Most strains acquired deletions in the benzoate-induced multiple antibiotic resistance (Mar) regulon or in associated regulators such as rob and cpxA, as well as the multidrug resistance (MDR) efflux pumps emrA, emrY, and mdtA Strains also lost or downregulated the Gad acid fitness regulon. In 5 mM benzoate or in 2 mM salicylate (2-hydroxybenzoate), most strains showed increased sensitivity to the antibiotics chloramphenicol and tetracycline; some strains were more sensitive than a marA knockout strain. Thus, our benzoate-evolved strains may reveal additional unknown drug resistance components. Benzoate or salicylate selection pressure may cause general loss of MDR genes and regulators.
    Importance: Benzoate is a common food preservative, and salicylate is the primary active metabolite of aspirin. In the gut microbiome, genetic adaptation to salicylate may involve loss or downregulation of inducible multidrug resistance systems. This discovery implies that aspirin therapy may modulate the human gut microbiome to favor salicylate tolerance at the expense of drug resistance. Similar aspirin-associated loss of drug resistance might occur in bacterial pathogens found in arterial plaques.
    MeSH term(s) Anti-Bacterial Agents/pharmacology ; Anti-Inflammatory Agents, Non-Steroidal/metabolism ; Benzoates/metabolism ; Biological Evolution ; Dose-Response Relationship, Drug ; Drug Resistance, Microbial/genetics ; Escherichia coli K12/drug effects ; Escherichia coli K12/genetics ; Escherichia coli K12/metabolism ; Food Preservatives/metabolism ; Gene Expression Regulation, Bacterial ; Salicylates/metabolism
    Chemical Substances Anti-Bacterial Agents ; Anti-Inflammatory Agents, Non-Steroidal ; Benzoates ; Food Preservatives ; Salicylates
    Language English
    Publishing date 2016-12-30
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 223011-2
    ISSN 1098-5336 ; 0099-2240
    ISSN (online) 1098-5336
    ISSN 0099-2240
    DOI 10.1128/AEM.02736-16
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Channel-mediated K(+) flux in barley aleurone protoplasts.

    Bush, D S / Hedrich, R / Schroeder, J I / Jones, R L

    Planta

    2013  Volume 176, Issue 3, Page(s) 368–377

    Abstract: Gibberellic acid (GA3) stimulates K(+) efflux from the barley (Hordeum vulgare L. cv. Himalaya ... aleurone. We investigated the mechanism of K(+) flux across the plasma membrane of aleurone protoplasts ... plasma membrane, were induced when the electrochemical gradient for K(+) was inward (into the cytoplasm ...

    Abstract Gibberellic acid (GA3) stimulates K(+) efflux from the barley (Hordeum vulgare L. cv. Himalaya) aleurone. We investigated the mechanism of K(+) flux across the plasma membrane of aleurone protoplasts using patch-clamp techniques. Potassium-ion currents, measured over the entire surface of the protoplast plasma membrane, were induced when the electrochemical gradient for K(+) was inward (into the cytoplasm). The magnitude and voltage-dependence of this inward current were the same in protoplasts treated with GA3 and in control protoplasts (no GA3). Inward currents activated by negative shifts in the membrane potential (EM) from the Nernst potential for K(+) (EK) showed membrane conductance to be a function of the electrochemical gradient (i.e. EM-EK). Single-channel influx currents of K(+) were recorded in small patches of the plasma membrane. These channels had a single-channel conductance of 5-10 pS with 100 mM K(+) on the inside and 10 mM K(+) on the outside of the plasma membrane. Single-channel currents, like whole-cell currents, were the same in protoplasts treated with GA3 and control protoplasts. Voltage-gated efflux currents were found only in protoplasts tha thad been incubated without GA3. We conclude that K(+) influx in the aleurone is mediated by channels and these membrane proteins are not greatly effected by GA3.
    Language English
    Publishing date 2013-11-13
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/BF00395417
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article: Knowledge-constrained K-medoids Clustering of Regulatory Rare Alleles for Burden Tests.

    Sivley, R Michael / Fish, Alexandra E / Bush, William S

    Evolutionary computation, machine learning and data mining in bioinformatics. EvoBIO (Conference)

    2014  Volume 7833, Page(s) 35–42

    Abstract: ... we contrast a simple sliding window approach with a knowledge-guided k-medoids clustering method to group rare ...

    Abstract Rarely occurring genetic variants are hypothesized to influence human diseases, but statistically associating these rare variants to disease is challenging due to a lack of statistical power in most feasibly sized datasets. Several statistical tests have been developed to either collapse multiple rare variants from a genomic region into a single variable (presence/absence) or to tally the number of rare alleles within a region, relating the burden of rare alleles to disease risk. Both these approaches, however, rely on user-specification of a genomic region to generate these collapsed or burden variables, usually an entire gene. Recent studies indicate that most risk variants for common diseases are found within regulatory regions, not genes. To capture the effect of rare alleles within non-genic regulatory regions for burden tests, we contrast a simple sliding window approach with a knowledge-guided k-medoids clustering method to group rare variants into statistically powerful, biologically meaningful windows. We apply these methods to detect genomic regions that alter expression of nearby genes.
    Language English
    Publishing date 2014-08-25
    Publishing country Germany
    Document type Journal Article
    DOI 10.1007/978-3-642-37189-9_4
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Genome-Wide Transcriptional Response to Varying RpoS Levels in Escherichia coli K-12.

    Wong, Garrett T / Bonocora, Richard P / Schep, Alicia N / Beeler, Suzannah M / Lee Fong, Anna J / Shull, Lauren M / Batachari, Lakshmi E / Dillon, Moira / Evans, Ciaran / Becker, Carla J / Bush, Eliot C / Hardin, Johanna / Wade, Joseph T / Stoebel, Daniel M

    Journal of bacteriology

    2017  Volume 199, Issue 7

    Abstract: The alternative sigma factor RpoS is a central regulator of many stress responses ... ...

    Abstract The alternative sigma factor RpoS is a central regulator of many stress responses in
    MeSH term(s) Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Blotting, Western ; Escherichia coli K12/metabolism ; Gene Expression Regulation, Bacterial/physiology ; Genome-Wide Association Study ; Mutation ; Promoter Regions, Genetic ; Sigma Factor/genetics ; Sigma Factor/metabolism ; Transcriptome
    Chemical Substances Bacterial Proteins ; Sigma Factor ; sigma factor KatF protein, Bacteria
    Language English
    Publishing date 2017-03-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2968-3
    ISSN 1098-5530 ; 0021-9193
    ISSN (online) 1098-5530
    ISSN 0021-9193
    DOI 10.1128/JB.00755-16
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Classification for β-lactamases: historical perspectives.

    Bush, Karen

    Expert review of anti-infective therapy

    2023  Volume 21, Issue 5, Page(s) 513–522

    Abstract: Introduction: β-Lactamases are some of the most prevalent and well-studied families of enzymes, especially in the area of antibiotic resistance. Early attempts to categorize them used either functional names, such as penicillinase or cephalosporinase or ...

    Abstract Introduction: β-Lactamases are some of the most prevalent and well-studied families of enzymes, especially in the area of antibiotic resistance. Early attempts to categorize them used either functional names, such as penicillinase or cephalosporinase or structural designations into classes A and B. Increasing diversity of the properties of these enzymes has required a more expansive approach to nomenclature.
    Areas covered: Historical designations for early β-lactamases relied heavily on functional names based on the biochemical properties of purified enzymes. As amino acid sequences began to be reported for a select group of these enzymes, classes of β-lactamases were defined, with a major lumping of enzymes into those that had active site serine residues (class A, C, and D) and those that were metallo-β-lactamases (MBLs or class B). More recent classification schemes, as determined through a Medline search, have attempted to incorporate both functional and structural features, using functional groups and subgroups to name β-lactamases within the same structural class. Nomenclature of these enzymes is now under the purview of the NCBI (National Center for Biotechnology Information).
    Expert opinion: β-Lactamase nomenclature will continue to evolve with the identification of new enzymes and new functionalities.
    MeSH term(s) Humans ; beta-Lactamases/genetics ; beta-Lactamase Inhibitors ; Anti-Bacterial Agents/pharmacology
    Chemical Substances beta-Lactamases (EC 3.5.2.6) ; beta-Lactamase Inhibitors ; Anti-Bacterial Agents
    Language English
    Publishing date 2023-04-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 2181279-2
    ISSN 1744-8336 ; 1478-7210
    ISSN (online) 1744-8336
    ISSN 1478-7210
    DOI 10.1080/14787210.2023.2194633
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Survey of the use of non-invasive positive pressure ventilation in U.K. and Australasian children with cystic fibrosis.

    Collins, N / Gupta, A / Wright, S / Gauld, L / Urquhart, D / Bush, A

    Thorax

    2011  Volume 66, Issue 6, Page(s) 538–539

    MeSH term(s) Adolescent ; Australasia ; Child ; Cystic Fibrosis/therapy ; Health Care Surveys ; Humans ; Positive-Pressure Respiration/utilization ; United Kingdom
    Language English
    Publishing date 2011-06
    Publishing country England
    Document type Letter ; Multicenter Study
    ZDB-ID 204353-1
    ISSN 1468-3296 ; 0040-6376
    ISSN (online) 1468-3296
    ISSN 0040-6376
    DOI 10.1136/thx.2010.139063
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article: The Genetic Basis for Mucoidy and Radiation Sensitivity in capR (lon) Mutants of E. coli K-12.

    Bush, J W / Markovitz, A

    Genetics

    2007  Volume 74, Issue 2, Page(s) 215–225

    Abstract: CapR mutants of E. coli K-12 overproduce capsular polysaccharide (mucoid phenotype) and enzymes ...

    Abstract CapR mutants of E. coli K-12 overproduce capsular polysaccharide (mucoid phenotype) and enzymes involved in capsular polysaccharide synthesis, and they are sensitive to radiation. It has been uncertain whether both properties are mediated by damage to a single cistron or by a polar effect on a second cistron in the same operon. Introduction of a polarity suppressor caused no change in the overproduction of polysaccharide, in the enzymes of polysaccharide synthesis or in radiation sensitivity of the capR mutant. Thus mucoidy and radiation sensitivity resulting from capR (lon) mutations are both the consequences of impairment of the same cistron. The experiments demonstrate the advantage of the use of polarity suppressors (over conventional nonsense suppressors) in determining whether pleiotropic effects of a mutation are the result of polarity.
    Language English
    Publishing date 2007-01-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2167-2
    ISSN 1943-2631 ; 0016-6731
    ISSN (online) 1943-2631
    ISSN 0016-6731
    DOI 10.1093/genetics/74.2.215
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Book ; Online ; E-Book: Psychology and neuropsychology in criminal forensic contexts

    Kaufman, Noah K. / Bush, Shane S. / Schneider, Nicole R. / Hicks, Scotia J.

    a guide for mental health and legal professionals

    2022  

    Abstract: This valuable compendium advances the understanding of mental health case law, making it highly accessible to practicing forensic professionals. Divided into two parts, the first section focuses on explaining important topics related to forensic ... ...

    Author's details Noah K. Kaufman, Shane S. Bush, Nicole R. Schneider and Scotia J. Hicks
    Abstract "This valuable compendium advances the understanding of mental health case law, making it highly accessible to practicing forensic professionals. Divided into two parts, the first section focuses on explaining important topics related to forensic psychological and forensic neuropsychological assessment, whilst the second section stands on its own as a collection of fascinating legal cases with high relevance to mental health and legal professionals interested in how mental health disorders impact criminal behavior among juveniles and adults. The book begins with an accessible primer on abnormal behavior, exploring the links between criminal behavior and mental health disorders. It goes on to thoroughly describe what goes into forensic psychological and forensic neuropsychological evaluations, including discussion about the Federal Rules of Evidence, as they pertain to evidence-generation during the mental health evaluation process. The book also focuses on psychometric concepts, including reliability, validity, sensitivity and specificity, as well as an exploration of 'science' and 'the law' which includes a discussion about the difference between science and pseudoscience, the different sources of law (constitutions, statutes, and case law), and how the intellectually competitive practice of law is similar to the enterprise of science. Ethical issues faced by the forensic mental health worker are also addressed. The second section of the book, Legal Cases for the Forensic Mental Health Professional, is an alphabetical summary of important and interesting legal cases with relevance for mental health professionals. These cases offer real-world significance whilst summarising complex legal decisions through a neuropsychological sieve, to allow both legal and psychological communities to better understand each other's professions. This book will be an invaluable resource for forensic psychologists, forensic neuropsychologists, forensic psychiatrists, and other mental health professionals whose work brings them into contact with the juvenile justice and adult criminal justice system. It will also be of interest to legal professionals, criminal justice departments and law schools"--
    Keywords Forensic neuropsychology
    Subject code 614.15
    Language English
    Size 1 online resource (383 pages)
    Publisher Routledge
    Publishing place Milton Park, Abingdon, Oxon ; New York, NY
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    ISBN 1-000-53944-X ; 1-000-53937-7 ; 0-367-64509-2 ; 0-367-64499-1 ; 0-367-64508-4 ; 978-1-000-53944-8 ; 978-1-000-53937-0 ; 978-0-367-64509-0 ; 978-0-367-64499-4 ; 978-0-367-64508-3
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

    Kategorien

To top