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https://www.readbyqxmd.com/read/28634236/alternative-evolutionary-pathways-for-drug-resistant-small-colony-variant-mutants-in-staphylococcus-aureus
#1
Sha Cao, Douglas L Huseby, Gerrit Brandis, Diarmaid Hughes
Staphylococcus aureus is known to generate small colony variants (SCVs) that are resistant to aminoglycoside antibiotics and can cause persistent and recurrent infections. The SCV phenotype is unstable, and compensatory mutations lead to restored growth, usually with loss of resistance. However, the evolution of improved growth, by mechanisms that avoid loss of antibiotic resistance, is very poorly understood. By selection with serial passaging, we isolated and characterized different classes of extragenic suppressor mutations that compensate for the slow growth of small colony variants...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28631816/cognitive-rehabilitation-for-adults-with-traumatic-brain-injury-to-improve-occupational-outcomes
#2
REVIEW
K Suresh Kumar, Selvaraj Samuelkamaleshkumar, Anand Viswanathan, Ashish S Macaden
BACKGROUND: Cognitive impairment in people with traumatic brain injury (TBI) could affect multiple facets of their daily functioning. Cognitive rehabilitation brings about clinically significant improvement in certain cognitive skills. However, it is uncertain if these improved cognitive skills lead to betterments in other key aspects of daily living. We evaluated whether cognitive rehabilitation for people with TBI improves return to work, independence in daily activities, community integration and quality of life...
June 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28621793/kinetics-and-mechanism-of-oxidation-of-the-anti-tubercular-prodrug-isoniazid-and-its-analog-by-iridium-iv-as-models-for-biological-redox-systems
#3
Jingran Dong, Yanli Ren, Sufang Sun, Jiao Yang, Chunxia Nan, Hongmei Shi, Jianzhong Xu, Jie Duan, Tiesheng Shi, Lars I Elding
A complex reaction mechanism of oxidation of the anti-tubercular prodrug isoniazid (isonicotinic hydrazide, INH) by [IrCl6](2-) as a model for redox processes of such drugs in biological systems has been studied in aqueous solution as a function of pH between 0 and 8.5. Similar experiments have been performed with its isomer nicotinic hydrazide (NH). All reactions are overall second-order, first-order in [IrCl6](2-) and hydrazide, and the observed second-order rate constants k' have been determined as a function of pH...
June 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28554062/an-isotope-dilution-uplc-ms-ms-technique-for-the-human-biomonitoring-of-the-internal-exposure-to-glycidol-via-a-valine-adduct-at-the-n-terminus-of-hemoglobin
#4
Jan Hielscher, Bernhard H Monien, Klaus Abraham, Sönke Jessel, Albrecht Seidel, Alfonso Lampen
Fatty acid esters of glycidol (glycidyl esters) are processing contaminants generated as a byproduct of the industrial deodorization of vegetable oils and fats. Oral intake of glycidyl esters leads to the release of glycidol in the gastrointestinal tract. Glycidol is carcinogenic, genotoxic and teratogenic in rodents. It is rated as probably carcinogenic to humans (IARC group 2A). The determination of internal exposure of glycidol may support the assessment of the possible human health risks related to glycidyl ester intake...
August 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28506326/a-model-to-infer-the-demographic-structure-evolution-of-endangered-donkey-populations
#5
F J Navas, J Jordana, J M León, C Barba, J V Delgado
Stemming from The Worldwide Donkey Breeds Project, an initiative aiming at connecting international researchers and entities working with the donkey species, molecularly tested pedigree analyses were carried out to study the genetic diversity, structure and historical evolution of the Andalusian donkey breed since the 1980s to infer a model to study the situation of international endangered donkey breeds under the remarkably frequent unknown genetical background status behind them. Demographic and genetic variability parameters were evaluated using ENDOG (v4...
May 16, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28502809/challenges-of-informed-consent-for-pragmatic-trials
#6
Shona Kalkman, Ghislaine Jmw van Thiel, Mira Gp Zuidgeest, Iris Goetz, Boris M Pfeiffer, Diederick E Grobbee, Johannes Jm van Delden
The Innovative Medicines Initiative's (IMI) GetReal consortium aims to develop strategies to incorporate real world evidence earlier into the drug life cycle to better inform health care decision-makers on the comparative risks and benefits of new drugs. Pragmatic trials are currently explored as a means to generate such evidence in routine care settings. The traditional informed consent model for randomized clinical trials has been argued to pose substantial hurdles to the practicability of pragmatic trials: it would lead to recruitment difficulties, reduced generalizability of the results and selection bias...
May 11, 2017: Journal of Clinical Epidemiology
https://www.readbyqxmd.com/read/28185538/synthesis-and-biological-evaluation-of-hybrid-1-5-and-2-5-disubstituted-indoles-as-potentially-new-antitubercular-agents
#7
Ana Soares, Mónica S Estevão, M Manuel B Marques, Vasily Kovalishyn, Diogo A R S Latino, João Aires-de-Sousa, Jorge Ramos, Miguel Viveiros, Filomena Martins
BACKGROUND: Tuberculosis (TB) is the second leading cause of mortality worldwide being a highly contagious and insidious illness caused by Mycobacterium tuberculosis, Mtb. Additionally, the emergence of multidrug-resistant and extensively drug-resistant strains of Mtb, together with significant levels of co-infection with HIV and TB (HIV/TB) makes the search for new antitubercular drugs urgent and challenging. METHODS: This work was based on the hypothesis that an active compound could be obtained if substituents present in some other active compounds were attached on a core of an important structure, in this case the indole scaffold, thus generating a hybrid compound...
February 9, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/28182580/internal-dosimetry-with-the-monte-carlo-code-gate-validation-using-the-icrp-icru-female-reference-computational-model
#8
Daphnée Villoing, Sara Marcatili, Marie-Paule Garcia, Manuel Bardiès
The purpose of this work was to validate GATE-based clinical scale absorbed dose calculations in nuclear medicine dosimetry. GATE (version 6.2) and MCNPX (version 2.7.a) were used to derive dosimetric parameters (absorbed fractions, specific absorbed fractions and S-values) for the reference female computational model proposed by the International Commission on Radiological Protection in ICRP report 110. Monoenergetic photons and electrons (from 50 keV to 2 MeV) and four isotopes currently used in nuclear medicine (fluorine-18, lutetium-177, iodine-131 and yttrium-90) were investigated...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28102616/development-and-psychometric-testing-of-the-attitudes-subjective-norms-perceived-behavioural-control-and-intention-to-pursue-a-career-in-mental-health-nursing-scale
#9
Mark Wilbourn, Yenna Salamonson, Lucie Ramjan, Sungwon Chang
The aim of the present study was to develop and test the psychometric properties of the Attitudes, Subjective Norms, Perceived Behavioural Control, and Intention to Pursue a Career in Mental Health Nursing (ASPIRE) scale, an instrument to assess nursing students' intention to work in mental health nursing. Understanding the factors influencing undergraduate nursing students' career intentions might lead to improved recruitment strategies. However, there are no standardized tools to measure and assess students' intention to pursue a career in mental health nursing...
January 19, 2017: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/28047566/su-f-j-147-magnetic-field-dose-response-considerations-for-a-linac-monitor-chamber
#10
M Reynolds, B Fallone
PURPOSE: The impact of magnetic fields on the readings of a linac monitor chamber have not yet been investigated. Herein we examine the total dose response as well as any deviations in the beam parameters of flatness and symmetry when a Varian monitor chamber is irradiated within an applied magnetic field. This work has direct application to the development of Linac-MR systems worldwide. METHODS: A Varian monitor chamber was modeled in the Monte Carlo code PENELOPE and irradiated in the presence of a magnetic field with a phase space generated from a model of a Linac-MR prototype system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27895572/plastic-changes-in-human-motor-cortical-output-induced-by-random-but-not-closed-loop-peripheral-stimulation-the-curse-of-causality
#11
Kenneth I Brown, Elizabeth R Williams, Felipe de Carvalho, Stuart N Baker
Previous work showed that repetitive peripheral nerve stimulation can induce plastic changes in motor cortical output. Triggering electrical stimulation of central structures from natural activity can also generate plasticity. In this study, we tested whether triggering peripheral nerve stimulation from muscle activity would likewise induce changes in motor output. We developed a wearable electronic device capable of recording electromyogram (EMG) and delivering electrical stimulation under closed-loop control...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27811385/evaluation-of-event-position-reconstruction-in-monolithic-crystals-that-are-optically-coupled
#12
M Morrocchi, W C J Hunter, A Del Guerra, T K Lewellen, P E Kinahan, L R MacDonald, M G Bisogni, R S Miyaoka
A PET detector featuring a pseudo-monolithic crystal is being developed as a more cost-effective alternative to a full monolithic crystal PET detector. This work evaluates different methods to localize the scintillation events in quartered monolithic crystals that are optically coupled. A semi-monolithic crystal assembly was formed using four 26  ×  26  ×  10 mm(3) LYSO crystals optically coupled together using optical adhesive, to mimic a 52  ×  52  ×  10 mm(3) monolithic crystal detector...
December 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27748587/qualitative-investigation-of-the-decomposition-of-organic-solvent-based-lithium-ion-battery-electrolytes-with-lc-it-tof-ms
#13
Carola Schultz, Sven Vedder, Martin Winter, Sascha Nowak
The development of a novel high performance liquid chromatography (HPLC) method hyphenated to an ion-trap time-of-flight mass spectrometer (IT-TOF-MS) for the separation and identification of constituents from common organic carbonate solvent-based electrolyte systems in lithium ion batteries (LIBs) is presented in this work. The method development was conducted for the qualitative structural elucidation of electrolyte main constituents with a special focus on the aging products of these components. The determination of their limits of detection was performed as well...
November 15, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27627621/how-computational-models-contribute-to-our-understanding-of-the-germ-line
#14
REVIEW
Kathryn Atwell, Sara-Jane Dunn, James M Osborne, Hillel Kugler, E Jane Albert Hubbard
Computational models are an invaluable tool in modern biology. They provide a framework within which to summarize existing knowledge, enable competing hypotheses to be compared qualitatively and quantitatively, and to facilitate the interpretation of complex data. Moreover, models allow questions to be investigated that are difficult to approach experimentally. Theories can be tested in context, identifying the gaps in our understanding and potentially leading to new hypotheses. Models can be developed on a variety of scales and with different levels of mechanistic detail, depending on the available data, the biological questions of interest, and the available mathematical and computational tools...
November 2016: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/27619396/analysis-of-the-impact-of-different-service-levels-on-the-workload-of-an-ambulance-service-provider
#15
Marco Oberscheider, Patrick Hirsch
BACKGROUND: Efficient transport of non-emergency patients is crucial for ambulance service providers to cope with increased demand resulting from aging Western societies. This paper deals with the optimization of the patient transport operations of the Red Cross of Lower Austria, which is the main provider in this state. Different quality levels of the provided service - expressed by time windows, feasible maximum ride times and exclusive transports - are tested and analyzed on real-life instances to show daily impacts on the provider's resources...
2016: BMC Health Services Research
https://www.readbyqxmd.com/read/27597823/the-reality-of-myoelectric-prostheses-understanding-what-makes-these-devices-difficult-for-some-users-to-control
#16
Alix Chadwell, Laurence Kenney, Sibylle Thies, Adam Galpin, John Head
Users of myoelectric prostheses can often find them difficult to control. This can lead to passive-use of the device or total rejection, which can have detrimental effects on the contralateral limb due to overuse. Current clinically available prostheses are "open loop" systems, and although considerable effort has been focused on developing biofeedback to "close the loop," there is evidence from laboratory-based studies that other factors, notably improving predictability of response, may be as, if not more, important...
2016: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/27402668/myocardial-energetics-is-not-compromised-during-compensated-hypertrophy-in-the-dahl-salt-sensitive-rat-model-of-hypertension
#17
Kenneth Tran, June-Chiew Han, Andrew J Taberner, Carolyn J Barrett, Edmund J Crampin, Denis S Loiselle
Salt-induced hypertension leads to development of left ventricular hypertrophy in the Dahl salt-sensitive (Dahl/SS) rat. Before progression to left ventricular failure, the heart initially undergoes a compensated hypertrophic response. We hypothesized that changes in myocardial energetics may be an early indicator of transition to failure. Dahl/SS rats and their salt-resistant consomic controls (SS-13(BN)) were placed on either a low- or high-salt diet to generate four cohorts: Dahl-SS rats on a low- (Dahl-LS) or high-salt diet (Dahl-HS), and SS-13(BN) rats on a low- (SSBN-LS) or high-salt diet (SSBN-HS)...
September 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27245161/a-rule-based-model-of-insulin-signalling-pathway
#18
Barbara Di Camillo, Azzurra Carlon, Federica Eduati, Gianna Maria Toffolo
BACKGROUND: The insulin signalling pathway (ISP) is an important biochemical pathway, which regulates some fundamental biological functions such as glucose and lipid metabolism, protein synthesis, cell proliferation, cell differentiation and apoptosis. In the last years, different mathematical models based on ordinary differential equations have been proposed in the literature to describe specific features of the ISP, thus providing a description of the behaviour of the system and its emerging properties...
2016: BMC Systems Biology
https://www.readbyqxmd.com/read/27240393/investigation-and-evaluation-of-children-s-blood-lead-levels-around-a-lead-battery-factory-and-influencing-factors
#19
Feng Zhang, Yang Liu, Hengdong Zhang, Yonghong Ban, Jianfeng Wang, Jian Liu, Lixing Zhong, Xianwen Chen, Baoli Zhu
Lead pollution incidents have occurred frequently in mainland China, which has caused many lead poisoning incidents. This paper took a battery recycling factory as the subject, and focused on measuring the blood lead levels of environmental samples and all the children living around the factory, and analyzed the relationship between them. We collected blood samples from the surrounding residential area, as well as soil, water, vegetables. The atomic absorption method was applied to measure the lead content in these samples...
May 28, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27084888/single-point-mutation-mediated-local-amphipathic-adjustment-dramatically-enhances-antibacterial-activity-of-a-fungal-defensin
#20
Jiajia Wu, Bin Gao, Shunyi Zhu
The emergence and rapid spread of multiresistant bacteria has lead to an urgent need for novel antimicrobials. Based on single-point substitutions, we generated a series of mutants of micasin, a dermatophytic defensin, with enhanced activities against multiple clinical isolates of Staphylococcus species, including 4 antibiotic-resistant strains. We first mapped the functional surface of micasin by alanine-scanning mutational analysis of its highly exposed residues, through which we found that substitution of site 8 (acidic Glu) dramatically enhanced bacterial killing of this peptide...
July 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
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