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https://www.readbyqxmd.com/read/29053845/substitution-of-yor1p-nbd1-residues-improves-the-thermal-stability-of-human-cystic-fibrosis-transmembrane-conductance-regulator
#1
B M Xavier, E Hildebrandt, F Jiang, H Ding, J C Kappes, I L Urbatsch
The Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) is a plasma membrane chloride channel protein that regulates vertebrate fluid homeostasis. The inefficiency of wild type human CFTR protein folding/trafficking is exacerbated by genetic mutations that can cause protein misfolding in the endoplasmic reticulum (ER) and subsequent degradation. This project investigates small changes in protein sequence that can alter the thermal stability of the large multi-domain CFTR protein. We target a conserved 70-residue α-subdomain located in the first nucleotide-binding domain that hosts the common misfolding mutation ∆F508...
October 19, 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/29053492/significance-of-mini-bronchoalveolar-lavage-fluid-amylase-level-in-ventilator-associated-pneumonia-a-prospective-observational-study
#2
Sukhen Samanta, Banani Poddar, Afzal Azim, Ratender K Singh, Mohan Gurjar, Arvind K Baronia
OBJECTIVES: Aspiration of oropharyngeal or gastric contents in intubated patients can lead to ventilator-associated pneumonia. Amylase in respiratory secretion has been reported as a possible marker of aspiration. We studied whether elevated α-amylase in mini bronchoalveolar lavage specimens can be suggestive of ventilator-associated pneumonia in intubated patients with high clinical suspicion. DESIGN: Prospective single-center observational study. SETTING: Department of Critical Care Medicine, tertiary care academic institute...
October 19, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/29053294/passive-control-of-viscous-flow-via-elastic-snap-through
#3
Michael Gomez, Derek E Moulton, Dominic Vella
We demonstrate the passive control of viscous flow in a channel by using an elastic arch embedded in the flow. Depending on the fluid flux, the arch may "snap" between two states-constricting and unconstricting-that differ in hydraulic conductivity by up to an order of magnitude. We use a combination of experiments at a macroscopic scale and theory to study the constricting and unconstricting states, and determine the critical flux required to transition between them. We show that such a device may be precisely tuned for use in a range of applications, and, in particular, has potential as a passive microfluidic fuse to prevent excessive fluxes in rigid-walled channels...
October 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29051934/forced-intrusion-of-water-and-aqueous-solutions-in-microporous-materials-from-fundamental-thermodynamics-to-energy-storage-devices
#4
REVIEW
Guillaume Fraux, François-Xavier Coudert, Anne Boutin, Alain H Fuchs
We review the high pressure forced intrusion studies of water in hydrophobic microporous materials such as zeolites and MOFs, a field of research that has emerged some 15 years ago and is now very active. Many of these studies are aimed at investigating the possibility of using these systems as energy storage devices. A series of all-silica zeolites (zeosil) frameworks were found suitable for reversible energy storage because of their stability with respect to hydrolysis after several water intrusion-extrusion cycles...
October 20, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/29051758/identification-of-yfih-and-the-catalase-cata-as-polyphenol-oxidases-of-aeromonas-media-and-cata-as-a-regulator-of-pigmentation-by-its-peroxyl-radical-scavenging-capacity
#5
Baozhong Chai, Yunqian Qiao, He Wang, Xiaoming Zhang, Jiao Wang, Choushi Wang, Ping Zhou, Xiangdong Chen
Pyomelanin is the major constituent of pigment in melanogenic Aeromonas strains of bacteria. However, eumelanin, synthesized from tyrosine via L-DOPA and polyphenol oxidases (PPOs), may also be present in this genus since L-DOPA is frequently detected in culture fluids of several species. To address this question, we used a deletion mutant of Aeromonas media strain WS, in which pyomelanin synthesis is completely blocked under normal culture conditions. When tyrosine was supplied to the medium, we observed residual melanin accumulation, which we interpret as evidence for existence of the DOPA-melanin pathway...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29050017/specificities-of-caries-on-root-surface
#6
Nailê Damé-Teixeira, Clarissa Cavalcanti Fatturi Parolo, Marisa Maltz
Variations in organic and inorganic composition and morphology may determine different susceptibilities of root surfaces to caries. Subsequent to gingival recession, root surfaces become exposed and those areas where Sharpey's fibers system was once inserted into the cementum are converted into canals for microbial penetration. In the presence of a cariogenic root biofilm, the fermentable carbohydrate from diet is converted into organic acid, and the root caries lesion is initiated in the exposed root site...
2017: Monographs in Oral Science
https://www.readbyqxmd.com/read/29049339/reliability-of-transcardiopulmonary-thermodilution-cardiac-output-measurement-in-experimental-aortic-valve-insufficiency
#7
Martin Petzoldt, Constantin J Trepte, Jan Ridder, Stefan Maisch, Philipp Klapsing, Jan F Kersten, Hans Peter Richter, Jens C Kubitz, Daniel A Reuter, Matthias S Goepfert
BACKGROUND: Monitoring cardiac output (CO) is important to optimize hemodynamic function in critically ill patients. The prevalence of aortic valve insufficiency (AI) is rising in the aging population. However, reliability of CO monitoring techniques in AI is unknown. The aim of this study was to investigate the impact of AI on accuracy, precision, and trending ability of transcardiopulmonary thermodilution-derived COTCPTD in comparison with pulmonary artery catheter thermodilution COPAC...
2017: PloS One
https://www.readbyqxmd.com/read/29048452/development-of-the-laboratory-prototype-cavypool-for-assessing-treatments-and-materials-for-swimming-pools
#8
F Valeriani, G Gianfranceschi, M Vitali, C Protano, V Romano Spica
BACKGROUND: Hygiene and surveillance in swimming pools are established by WHO Guidelines and national laws. Progress in water management and pool construction is revolutionizing the field, introducing new materials, systems, disinfection procedures or monitoring markers. Innovation advances challenge the upgrading of safety and quality in pools and the appropriate implementation of guidelines. STUDY DESIGN: In order to provide a device for laboratory test, a prototype was realized and applied to study and compare swimming pool materials and treatments...
November 2017: Annali di Igiene: Medicina Preventiva e di Comunità
https://www.readbyqxmd.com/read/29047195/hepatic-transudation-barrier-properties
#9
R M Dongaonkar, R H Stewart, C M Quick, K L Uray, C S Cox, G A Laine
OBJECTIVE: Fluid and protein continuously transudes from the surface of the liver. Despite a common understanding that transudation plays a critical role in hepatic interstitial and peritoneal fluid balance, transudation from the entire liver has not been studied. Therefore, the goal of the present work was to provide the first direct measurement of the hepatic transudation rate and transudation barrier properties. METHODS: Transudation rates were determined by collecting transudate from the entire liver...
October 19, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/29046875/asymmetric-rna-distribution-among-cells-and-their-secreted-exosomes-biomedical-meaning-and-considerations-on-diagnostic-applications
#10
REVIEW
Marco Ragusa, Cristina Barbagallo, Matilde Cirnigliaro, Rosalia Battaglia, Duilia Brex, Angela Caponnetto, Davide Barbagallo, Cinzia Di Pietro, Michele Purrello
Over the past few years, exosomes and their RNA cargo have been extensively studied because of the fascinating biological roles they play in cell-to-cell communication, including the signal exchange among cancer, stromal, and immune cells, leading to modifications of tumor microenvironment. RNAs, especially miRNAs, stored within exosomes, seem to be among the main determinants of such signaling: their sorting into exosomes appears to be cell-specific and related to cellular physiopathology. Accordingly, the identification of exosomal miRNAs in body fluids from pathological patients has become one of the most promising activity in the field of biomarker discovery...
2017: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/29045570/optogenetic-activation-of-the-infralimbic-cortex-suppresses-the-return-of-appetitive-pavlovian-conditioned-responding-following-extinction
#11
Franz R Villaruel, Franca Lacroix, Christian Sanio, Daniel W Sparks, C Andrew Chapman, Nadia Chaudhri
The infralimbic medial prefrontal cortex (IL) is important for suppressing learned behavior after extinction, but whether this function extends to responses acquired through appetitive Pavlovian conditioning is unclear. We trained male, Long-Evans rats to associate a white-noise conditional stimulus (CS; 10 s; 14 presentations per session) with 10% liquid sucrose (0.2 mL per CS presentation), and recorded entries into the fluid port during the CS. The CS was presented without sucrose in subsequent extinction and test sessions...
October 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29038802/viscous-forces-and-bulk-viscoelasticity-near-jamming
#12
Karsten Baumgarten, Brian P Tighe
When weakly jammed packings of soft, viscous, non-Brownian spheres are probed mechanically, they respond with a complex admixture of elastic and viscous effects. While many of these effects are understood for specific, approximate models of the particles' interactions, there are a number of proposed force laws in the literature, especially for viscous interactions. We numerically measure the complex shear modulus G* of jammed packings for various viscous force laws that damp relative velocities between pairs of contacting particles or between a particle and the continuous fluid phase...
October 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29037894/indentation-mapping-reveals-poroelastic-but-not-viscoelastic-properties-spanning-native-zonal-articular-cartilage
#13
Joseph A Wahlquist, Frank W DelRio, Mark A Randolph, Aaron H Aziz, Chelsea M Heveran, Stephanie J Bryant, Corey P Neu, Virginia L Ferguson
Osteoarthrosis is a debilitating disease affecting millions, yet engineering materials for cartilage regeneration has proven difficult because of the complex microstructure of this tissue. Articular cartilage, like many biological tissues, produces a time-dependent response to mechanical load that is critical to cell's physiological function in part due to solid and fluid phase interactions and property variations across multiple length scales. Recreating the time-dependent strain and fluid flow may be critical for successfully engineering replacement tissues but thus far has largely been neglected...
October 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29037843/spatio-temporal-flow-and-wall-shear-stress-mapping-based-on-incoherent-ensemble-correlation-of-ultrafast-contrast-enhanced-ultrasound-images
#14
Chee Hau Leow, Meng-Xing Tang
In this study, a technique for high-frame-rate ultrasound imaging velocimetry (UIV) is extended first to provide more robust quantitative flow velocity mapping using ensemble correlation of images without coherent compounding, and second to generate spatio-temporal wall shear stress (WSS) distribution. A simulation model, which couples the ultrasound simulator with analytical flow solution, was implemented to evaluate its accuracy. It is shown that the proposed approach can reduce errors in velocity estimation by up to 10-fold in comparison with the coherent correlation approach...
October 13, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29036852/rehabilitation-modality-and-onset-differentially-influence-whisker-sensory-hypersensitivity-after-diffuse-traumatic-brain-injury-in-the-rat
#15
Theresa Currier Thomas, Ellen Magee Stockhausen, L Matthew Law, Aida Khodadad, Jonathan Lifshitz
BACKGROUND: As rehabilitation strategies advance as therapeutic interventions, the modality and onset of rehabilitation after traumatic brain injury (TBI) are critical to optimize treatment. Our laboratory has detected and characterized a late-onset, long-lasting sensory hypersensitivity to whisker stimulation in diffuse brain-injured rats; a deficit that is comparable to visual or auditory sensory hypersensitivity in humans with an acquired brain injury. OBJECTIVE: We hypothesize that the modality and onset of rehabilitation therapies will differentially influence sensory hypersensitivity in response to the Whisker Nuisance Task (WNT) as well as WNT-induced corticosterone (CORT) stress response in diffuse brain-injured rats and shams...
October 9, 2017: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/29029643/an-integrated-methodology-for-assessing-the-impact-of-food-matrix-and-gastrointestinal-effects-on-the-biokinetics-and-cellular-toxicity-of-ingested-engineered-nanomaterials
#16
Glen M DeLoid, Yanli Wang, Klara Kapronezai, Laura Rubio Lorente, Roujie Zhang, Georgios Pyrgiotakis, Nagarjun V Konduru, Maria Ericsson, Jason C White, Roberto De La Torre-Roche, Hang Xiao, David Julian McClements, Philip Demokritou
BACKGROUND: Engineered nanomaterials (ENMs) are increasingly added to foods to improve their quality, sensory appeal, safety and shelf-life. Human exposure to these ingested ENMs (iENMS) is inevitable, yet little is known of their hazards. To assess potential hazards, efficient in vitro methodologies are needed to evaluate particle biokinetics and toxicity. These methodologies must account for interactions and transformations of iENMs in foods (food matrix effect) and in the gastrointestinal tract (GIT) that are likely to determine nano-biointeractions...
October 13, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/29029510/adenovirus-mediated-delivery-of-sema3a-alleviates-rheumatoid-arthritis-in-a-serum-transfer-induced-mouse-model
#17
Yue Teng, Zhanhai Yin, Jing Li, Kun Li, Xu Li, Yan Zhang
Rheumatoid arthritis is a chronic autoimmune disease characterized by infiltration of inflammatory cells into the synovium and destruction of cartilage and bone. Macrophages, fibroblast-like synoviocytes (FLS), and osteoclasts are critical cells driving the pathogenesis of RA. Semaphorin 3A (Sema3A) is recently identified as an essential player in the bone homeostasis, however its role in RA progression especially in the macrophage polarization are poorly understood. In the present study, we found that Sems3A levels were significantly decreased in RA serum and synovial fluid compared to OA controls...
September 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29028072/vitamin-d-in-human-reproduction-the-more-the-better-an-evidence-based-critical-appraisal
#18
A S Laganà, S G Vitale, H Ban Frangež, E Vrtačnik-Bokal, R D'Anna
OBJECTIVE: Vitamin D is a fat-soluble secosteroid hormone that regulates calcium, magnesium, and phosphate homeostasis and plays a pivotal role as antiproliferative and immunomodulatory mediator. Considering the different sources of synthesis and dietary intake as well as the pleiotropic actions in extremely diverse (micro)environments of the body, the supplementation of this Vitamin should be carefully evaluated taking into account the several pathways that it regulates. In the current brief review, we aimed to summarize the available evidence about the topic, in order to suggest the best evidence-based supplementation strategy for human reproduction, avoiding the unuseful (and sometimes hazardous) empiric supplementation...
September 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29027687/filter-adsorption-of-anidulafungin-to-a-polysulfone-based-hemofilter-during-cvvhd-in-vitro
#19
Peter Kolbinger, Michael Gruber, Gabriel Roth, Bernhard M Graf, Karl-Peter Ittner
Candidemia is frequent in critically ill patients, especially in combination with an acute kidney injury (AKI). Echinocandins generally are recommended for therapy of such infections. Recent studies found no need for dosage adjustment in patients with end-stage renal disease receiving hemodialysis, or patients with AKI receiving continuous venovenous hemofiltration. The aim of this in vitro study was to examine the adsorption of anidulafungin to the surface of the hemofilter during continuous venovenous hemodialysis (CVVHD) and its effect on anidulafungin concentrations...
October 13, 2017: Artificial Organs
https://www.readbyqxmd.com/read/29027657/practical-issues-of-nutrition-during-continuous-renal-replacement-therapy
#20
Dariusz Onichimowski, Radosław Goraj, Rakesh Jalali, Jolanta Grabala, Ewa Mayzner-Zawadzka, Mirosław Czuczwar
Continuous renal replacement therapy (CRRT) in critically ill patients has significant impact on one's ability to provide efficient nutritional therapy. CRRT may help in the prevention of intestinal oedema and the maintenance of the proper function of the gastrointestinal tract by enabling strict control of the fluid balance. It facilitates early introduction of nutrition via the enteral route, as well as allowing for the composition of high-volume feeding mixtures. It is necessary to take into consideration that during CRRT, together with blood purification of toxic substances, nutritive elements are also eliminated to some extent (micro- and macronutrients)...
October 13, 2017: Anaesthesiology Intensive Therapy
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