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Bioreactance

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https://www.readbyqxmd.com/read/28884187/enantioselective-recognition-of-an-isomeric-ligand-by-a-biomolecule-mechanistic-insights-into-static-and-dynamic-enantiomeric-behavior-and-structural-flexibility
#1
Wei Peng, Fei Ding
Chirality is a ubiquitous basic attribute of nature, which inseparably relates to the life activity of living organisms. However, enantiomeric differences have still failed to arouse enough attention during the biological evaluation and practical application of chiral substances, and this poses a large threat to human health. In the current study, we explore the enantioselective biorecognition of a chiral compound by an asymmetric biomolecule, and then decipher the molecular basis of such a biological phenomenon on the static and, in particular, the dynamic scale...
September 8, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28871609/the-origin-of-soil-organic-matter-controls-its-composition-and-bioreactivity-across-a-mesic-boreal-forest-latitudinal-gradient
#2
Lukas Kohl, Michael Philben, Kate A Edwards, Frances A Podrebarac, Jamie Warren, Susan E Ziegler
Warmer climates have been associated with reduced bioreactivity of soil organic matter (SOM) typically attributed to increased diagenesis; the combined biological and physiochemical transformation of SOM. Additionally, cross site studies have indicated that ecosystem regime shifts, associated with long-term climate warming, can affect SOM properties through changes in vegetation and plant litter production thereby altering the composition of soil inputs. The relative importance of these two controls, diagenesis and inputs, on SOM properties as ecosystems experience climate warming, however, remains poorly understood...
September 4, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28866204/a-facile-novel-fluorocarbon-copolymer-solution-coating-process-for-improving-platelet-compatibility-of-titanium
#3
Sophia Chao-Wei Huang, Chi-Hui Cheng, Yun Chiu, Yi-Ching Lin, Jui-Che Lin
Titanium (Ti) and its alloys possess mechanical properties that are desirable in many biomedical applications compared to other metals. Furthermore, the native metal oxide layer that prevents further oxidation is also known to be biocompatible. However, clinical findings have shown that titanium and its alloys are prone to adverse bioreactions such as platelet adhesion and activation which could lead to thrombogenic complications. It has been found that surfaces modified with fluorocarbons could reduce the degree of both platelet adhesion and activation...
November 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28863996/improvement-of-fermentation-performance-of-gluconobacter-oxydans-by-combination-of-enhanced-oxygen-mass-transfer-in-compressed-oxygen-supplied-sealed-system-and-cell-recycle-technique
#4
Xin Zhou, Xuelian Zhou, Yong Xu
Oxygen supply for microbial cultures is often identified as a limiting factor for aerobic fermentation. Through implementation of an integrated oxygen control strategy, the high oxygen mass transfer rate satisfied cellular metabolic demands. Gluconobacter oxydans NL71 fermentation of xylose to xylonic acid was improved remarkably. Finally, the productivity of xylonic acid from xylose by biooxidation was markedly increased to 32.5±3.1g/L/h compared to production levels using conventional laboratory-scale bioreactors...
August 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28805054/a-scalable-field-study-protocol-and-rationale-for-passive-ambient-air-sampling-a-spatial-phytosampling-for-leaf-data-collection
#5
Tonny J Oyana, Slawomir M Lomnicki, Chuqi Guo, Stephania A Cormier
Stable, bioreactive, radicals known as environmentally persistent free radicals (EPFRs) have been found to exist on the surface of airborne PM2.5. These EPFRs have been found to form during many combustion processes, are present in vehicular exhaust, and persist in the environment for weeks and biological systems for up to 12 h. To measure EPFRs in PM samples, high volume samplers are required and measurements are less representative of community exposure; therefore, we developed a novel spatial phytosampling methodology to study the spatial patterns of EPFR concentrations using plants...
August 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28642078/experimental-tests-on-commercial-sweet-product-residue-spr-as-a-suitable-feed-for-anaerobic-bioenergy-h2-ch4-production
#6
Andrea C Luongo Malavè, Debora Fino, Carlos E Gómez Camacho, Bernardo Ruggeri
Food stores can find themselves in the position of having to dispose of different types of products, such as snacks, confectionery, prepackaged food, drinks and others, Sweet Product Residue (SPR), which presents a great opportunity to produce energy through Anaerobic Digestion (AD), due to its high sugar, carbohidrate and fat contents. In order to valorise SPR, this paper takes into consideration the all necessary treatments; owing the fact that the refuses are constitute by an organic part and packaging (plastic, paper and their combinations), a pretreatment able to remove the latter is necessary...
June 19, 2017: Waste Management
https://www.readbyqxmd.com/read/28574213/comparison-of-cardiac-output-estimates-by-bioreactance-and-inert-gas-rebreathing-methods-during-cardiopulmonary-exercise-testing
#7
Nduka C Okwose, Shakir Chowdhury, David Houghton, Michael I Trenell, Christopher Eggett, Matthew Bates, Guy A MacGowan, Djordje G Jakovljevic
PURPOSE: This study assessed the agreement between cardiac output estimated by inert gas rebreathing and bioreactance methods at rest and during exercise. METHODS: Haemodynamic measurements were assessed in 20 healthy individuals (11 females, nine males; aged 32 ± 10 years) using inert gas rebreathing and bioreactance methods. Gas exchange and haemodynamic data were measured simultaneously under rest and different stages (i.e. 30, 60, 90, 120, 150 and 180 W) of progressive graded cardiopulmonary exercise stress testing using a bicycle ergometer...
June 2, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28525778/inferior-vena-cava-collapsibility-detects-fluid-responsiveness-among-spontaneously-breathing-critically-ill-patients
#8
Keith A Corl, Naomi R George, Justin Romanoff, Andrew T Levinson, Darin B Chheng, Roland C Merchant, Mitchell M Levy, Anthony M Napoli
PURPOSE: Measurement of inferior vena cava collapsibility (cIVC) by point-of-care ultrasound (POCUS) has been proposed as a viable, non-invasive means of assessing fluid responsiveness. We aimed to determine the ability of cIVC to identify patients who will respond to additional intravenous fluid (IVF) administration among spontaneously breathing critically-ill patients. METHODS: Prospective observational trial of spontaneously breathing critically-ill patients...
May 12, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28482223/biological-effects-of-%C3%AE-adrenergic-phentolamine-on-erythrocyte-hemeprotein-molecular-insights-from-biorecognition-behavior-protein-dynamics-and-flexibility
#9
Wei Peng, Fei Ding, Yu-Kui Peng, Yong Xie
Phentolamine is one of the most representative nonselective α-adrenoreceptor blocking agents, which have been proved to be owned various pharmacological actions. Unfortunately, whether erythrocytes in the veins intervene in biological behaviors of such drug are largely obscured. With the aid of multiple biophysical techniques, this scenario was to detailed explore the potential biorecognition between phentolamine and the hemeprotein in the cytosol of erythrocytes, and the influences of dynamic characters of protein during the bioreaction...
June 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28441030/measuring-cardiac-output-during-cardiopulmonary-exercise-testing
#10
Carlo Vignati, Gaia Cattadori
Cardiac output is a key parameter in the assessment of cardiac function, and its measurement is fundamental to the diagnosis, treatment, and prognostic evaluation of all heart diseases. Until recently, cardiac output determination during exercise had been only possible through invasive methods, which were not practical in the clinical setting. Because [Formula: see text]o2 is cardiac output times arteriovenous content difference, evaluation of cardiac output is usually included in its measurement. Because of the difficulty of directly measuring peak exercise cardiac output, indirect surrogate parameters have been proposed, but with only modest clinical usefulness...
July 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28419043/confirmation-of-sexual-dimorphisms-in-metal-hypersensitivity-and-joint-pain-following-total-joint-arthroplasty-commentary-on-an-article-by-marco-s-caicedo-phd-et-al-females-with-unexplained-joint-pain-following-total-joint-arthroplasty-exhibit-a-higher-rate
#11
https://www.readbyqxmd.com/read/28419029/females-with-unexplained-joint-pain-following-total-joint-arthroplasty-exhibit-a-higher-rate-and-severity-of-hypersensitivity-to-implant-metals-compared-with-males-implications-of-sex-based-bioreactivity-differences
#12
Marco S Caicedo, Edward Solver, Latasha Coleman, Joshua J Jacobs, Nadim J Hallab
BACKGROUND: Recent studies indicate that females demonstrate an increased risk of experiencing adverse local tissue reactions, aseptic loosening, and revision after primary metal-on-metal hip resurfacing arthroplasty compared with males; the underlying biological mechanisms responsible for sex discrepancies in implant failure remain unclear. In addition to anatomical and biomechanical sex differences, there may be inherent immunological disparities that predispose females to more aggressive adaptive immune reactivity to implant debris, i...
April 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28403411/comparison-of-bioreactance-and-echocardiographic-non-invasive-cardiac-output-monitoring-and-myocardial-function-assessment-in-primagravida-women
#13
A Doherty, A El-Khuffash, C Monteith, L McSweeney, C Breatnach, E Kent, E Tully, F Malone, P Thornton
Background.: Non-invasive cardiac output monitoring (NICOM) using bioreactance (BRT) in pregnancy is gaining interest but lacks validation. We compared simultaneous cardiac output (CO) measurements obtained using the NICOM ® (BRT-CO) and echocardiography (echo-CO), and assessed the relationship between maternal characteristics and myocardial performance. Methods.: Paired stroke volume (SV) and CO readings were obtained using NICOM ® and echocardiography, in a group of healthy nulliparous women throughout a 15 min period...
April 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28398907/cardiopulmonary-monitoring-of-shock
#14
James Simmons, Corey E Ventetuolo
PURPOSE OF REVIEW: We will briefly review the classification of shock and the hallmark features of each subtype. Available modalities for monitoring shock patients will be discussed, along with evidence supporting the use, common pitfalls, and practical considerations of each method. RECENT FINDINGS: As older, invasive monitoring methods such as the pulmonary artery catheter have fallen out of favor, newer technologies for cardiac output estimation, echocardiography, and noninvasive tests such as passive leg raising have gained popularity...
June 2017: Current Opinion in Critical Care
https://www.readbyqxmd.com/read/28391426/comparison-of-stroke-volume-measurement-between-non-invasive-bioreactance-and-esophageal-doppler-in-patients-undergoing-major-abdominal-pelvic-surgery
#15
Gennaro De Pascale, Mervyn Singer, David Brealey
PURPOSE: Bioreactance is a non-invasive technology for measuring stroke volume (SV) in the operating room and critical care setting. We evaluated how the NICOM(®) bioreactance device performed against the CardioQ(®) esophageal Doppler monitor in patients undergoing major abdominal-pelvic surgery, focusing on the effect of different hemodynamic interventions. METHODS: SVNICOM and SVODM were simultaneously measured intraoperatively, including before and after interventions including fluid challenge, vasopressor boluses, peritoneal gas insufflation/removal, and Trendelenburg/reverse Trendelenburg patient positioning...
August 2017: Journal of Anesthesia
https://www.readbyqxmd.com/read/28366285/a-review-of-hemodynamic-monitoring-techniques-methods-and-devices-for-the-emergency-physician
#16
REVIEW
Abdullah E Laher, Matthew J Watermeyer, Sean K Buchanan, Nicole Dippenaar, Nelly Clotilde Tchouambou Simo, Feroza Motara, Muhammed Moolla
The emergency department (ED) is frequently the doorway to the intensive care unit (ICU) for a significant number of critically ill patients presenting to the hospital. Hemodynamic monitoring (HDM) which is a key component in the effective management of the critically ill patient presenting to the ED, is primarily concerned with assessing the performance of the cardiovascular system and determining the correct therapeutic intervention to optimise end-organ oxygen delivery. The spectrum of hemodynamic monitoring ranges from simple clinical assessment and routine bedside monitoring to point of care ultrasonography and various invasive monitoring devices...
September 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28251989/silver-nanoparticles-reduce-brain-inflammation-and-related-neurotoxicity-through-induction-of-h2s-synthesizing-enzymes
#17
Daniel A Gonzalez-Carter, Bey Fen Leo, Pakatip Ruenraroengsak, Shu Chen, Angela E Goode, Ioannis G Theodorou, Kian Fan Chung, Raffaella Carzaniga, Milo S P Shaffer, David T Dexter, Mary P Ryan, Alexandra E Porter
Silver nanoparticles (AgNP) are known to penetrate into the brain and cause neuronal death. However, there is a paucity in studies examining the effect of AgNP on the resident immune cells of the brain, microglia. Given microglia are implicated in neurodegenerative disorders such as Parkinson's disease (PD), it is important to examine how AgNPs affect microglial inflammation to fully assess AgNP neurotoxicity. In addition, understanding AgNP processing by microglia will allow better prediction of their long term bioreactivity...
March 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28188408/cross-comparisons-of-trending-accuracies-of-continuous-cardiac-output-measurements-pulse-contour-analysis-bioreactance-and-pulmonary-artery-catheter
#18
Bouchra Lamia, Hyung Kook Kim, Donald A Severyn, Michael R Pinsky
We compared the similarity of cardiac-output (CO) estimates between available bolus thermodilution pulmonary-artery catheters (PAC), arterial pulse-contour analysis (LiDCOplus(™), FloTrac(™) and PiCCOplus(™)), and bioreactance (NICOM(™)). Repetitive simultaneous estimates of CO obtained from the above devices were compared in 21 cardiac-surgery patients during the first 2 h post-surgery. Mean and absolute values for CO across the devices were compared by ANOVA, Bland-Altman, Pearson moment, and linear-regression analyses...
February 10, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28183565/minimum-effective-fluid-volume-of-colloid-to-prevent-hypotension-during-caesarean-section-under-spinal-anesthesia-using-a-prophylactic-phenylephrine-infusion-an-up-down-sequential-allocation-study
#19
Christian Loubert, Pierre-Olivier Gagnon, Roshan Fernando
STUDY OBJECTIVE: The aim of this study was to de termine the minimum effective fluid volume (MEFV) of hydroxyethyl starch 130/0.4 (HES) infused in a preload fashion which would prevent hypotension in 50% of parturients undergoing caesarean section. A secondary objective was to measure the hemodynamic effect of fluid loading on the subjects. DESIGN: This is a prospective, double-blinded, dose-finding study using an up-down sequential allocation design. SETTING: In the operating room...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28181062/progress-in-biocatalysis-with-immobilized-viable-whole-cells-systems-development-reaction-engineering-and-applications
#20
REVIEW
Milan Polakovič, Juraj Švitel, Marek Bučko, Jaroslav Filip, Vilém Neděla, Marion B Ansorge-Schumacher, Peter Gemeiner
Viable microbial cells are important biocatalysts in the production of fine chemicals and biofuels, in environmental applications and also in emerging applications such as biosensors or medicine. Their increasing significance is driven mainly by the intensive development of high performance recombinant strains supplying multienzyme cascade reaction pathways, and by advances in preservation of the native state and stability of whole-cell biocatalysts throughout their application. In many cases, the stability and performance of whole-cell biocatalysts can be highly improved by controlled immobilization techniques...
February 8, 2017: Biotechnology Letters
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