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https://www.readbyqxmd.com/read/29160706/synthesis-and-characterization-of-ultralow-fouling-poly-n-acryloyl-glycinamide-brushes
#1
Fengyu Yang, Yonglan Liu, Yanxian Zhang, Baiping Ren, Jianxiong Xu, Jie Zheng
Rational design of biomaterials with antifouling properties still remains a challenge, but is important for many bench-to-bedside applications for biomedical implants, drug delivery carriers, and marine coatings. Herein we synthesized and characterized poly(N-acryloylglycinamide) (polyNAGA) and then grafted poly(NAGA) onto Au substrate to form polymer brushes with well controlled film stability, wettability and thickness using the surface-initiated atom transfer radical polymerization (SI-ATRP). The NAGA monomer integrates two hydrophilic amides on the side chain to enhance surface hydration, which is thought as a critical contributor to antifouling property...
November 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29152026/particle-separation-by-phase-modulated-surface-acoustic-waves
#2
Gergely Simon, Marco A B Andrade, Julien Reboud, Jose Marques-Hueso, Marc P Y Desmulliez, Jonathan M Cooper, Mathis O Riehle, Anne L Bernassau
High efficiency isolation of cells or particles from a heterogeneous mixture is a critical processing step in lab-on-a-chip devices. Acoustic techniques offer contactless and label-free manipulation, preserve viability of biological cells, and provide versatility as the applied electrical signal can be adapted to various scenarios. Conventional acoustic separation methods use time-of-flight and achieve separation up to distances of quarter wavelength with limited separation power due to slow gradients in the force...
September 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/29150500/dynamics-of-heterotrophic-bacterial-assemblages-within-synechococcus-cultures
#3
Qiang Zheng, Yu Wang, Rui Xie, Andrew S Lang, Yanting Liu, Jiayao Lu, Xiaodong Zhang, Jun Sun, Curtis A Suttle, Nianzhi Jiao
Interactions between photoautotrophic and heterotrophic microorganisms are central to the marine microbial ecosystem. Lab cultures of one of the dominant marine photoautotrophs, Synechococcus, have historically been difficult to render axenic, presumably because these bacteria depend upon other organisms to grow in these conditions. These tight associations between Synechococcus and heterotrophic bacteria represent a good, relevant system to study interspecies interactions. Ten individual Synechococcus strains, isolated from eutrophic and oligotrophic waters, were chosen for investigation...
November 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29149476/clinical-parameters-before-and-after-the-transition-to-dialysis
#4
Dugan W Maddux, Len A Usvyat, Terry Ketchersid, Yue Jiao, Tommy C Blanchard, Peter Kotanko, Frank M van der Sande, Jeroen P Kooman, Franklin W Maddux
INTRODUCTION: The transition from pre-dialysis chronic kidney disease (CKD) to post-dialysis start is a critical period associated with high patient mortality and increased hospital admissions. Little is known about the trends of key clinical and laboratory parameters through this time of transition to start dialysis. METHODS: De-identified data including demographics, vital signs, lab results, and eGFR from the Fresenius Medical Care-CKD Registry were analyzed to determine trends in clinical and laboratory parameters through the time of transition from 12 months pre-dialysis start to 12 months post-dialysis start...
November 17, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/29099724/identifying-compensatory-movement-patterns-in-the-upper-extremity-using-a-wearable-sensor-system
#5
Rajiv Ranganathan, Rui Wang, Bo Dong, Subir Biswas
OBJECTIVE: Movement impairments such as those due to stroke often result in the nervous system adopting atypical movements to compensate for movement deficits. Monitoring these compensatory patterns is critical for improving functional outcomes during rehabilitation. The purpose of this study was to test the feasibility and validity of a wearable sensor system for detecting compensatory trunk kinematics during activities of daily living. APPROACH: Participants with no history of neurological impairments performed reaching and manipulation tasks with their upper extremity, and their movements were recorded by a wearable sensor system and validated using a motion capture system...
November 3, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29099585/a-sweet-embrace-control-of-protein-protein-interactions-by-o-linked-%C3%AE-n-acetylglucosamine
#6
Heather J Tarbet, Clifford A Toleman, Michael Boyce
O-linked β-N-acetylglucosamine (O-GlcNAc) is a critical post-translational modification (PTM) of thousands of intracellular proteins. Reversible O-GlcNAcylation governs many aspects of cell physiology and is dysregulated in numerous human diseases. Despite this broad pathophysiological significance, major aspects of O-GlcNAc signaling remain poorly understood, including the biochemical mechanisms through which O-GlcNAc transduces information. Recent work from many labs, including our own, has revealed that O-GlcNAc, like other intracellular PTMs, can control its substrates' functions by inhibiting or inducing protein-protein interactions...
November 3, 2017: Biochemistry
https://www.readbyqxmd.com/read/29099324/graf3-serves-as-a-blood-volume-sensitive-rheostat-to-control-smooth-muscle-contractility-and-blood-pressure
#7
Xue Bai, Kevin Mangum, Masao Kakoki, Oliver Smithies, Christopher P Mack, Joan M Taylor
Vascular resistance is a major determinant of BP and is controlled, in large part, by RhoA-dependent smooth muscle cell (SMC) contraction within small peripheral arterioles and previous studies from our lab indicate that GRAF3 is a critical regulator of RhoA in vascular SMC. The elevated contractile responses we observed in GRAF3 deficient vessels coupled with the hypertensive phenotype provided a mechanistic link for the hypertensive locus recently identified within the GRAF3 gene. On the basis of our previous findings that the RhoA signaling axis also controls SMC contractile gene expression and that GRAF3 expression was itself controlled by this pathway, we postulated that GRAF3 serves as an important counter-regulator of SMC phenotype...
November 3, 2017: Small GTPases
https://www.readbyqxmd.com/read/29083113/hydroxyethyl-starch-and-kidney-function-a-retrospective-study-in-patients-undergoing-therapeutic-plasma-exchange
#8
Muthuchellappan Radhakrishnan, Akshay Batra, Sundar Periyavan, Mariamma Philip, Vivek Anand
PURPOSE: Hydroxyethyl starch (HES) and albumin are used as replacement fluids during therapeutic plasma exchange (TPE). HES solutions are no longer recommended in critically ill patients due to its effect on kidneys and coagulation. In this retrospective study, we tried to look at the association between cumulative HES administration and kidney function in patients undergoing TPE. METHODS: Transfusion medicine department register was scrutinized to identify adult patients who had completed at least 5 cycles of TPE during the period June 2014-May 2015...
October 30, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/29080219/perovskite-solar-cells-from-the-lab-to-the-assembly-line
#9
Antonio Abate, Juan-Pablo Correa-Baena, Michael Saliba, Mohd Sukor Su'ait, Federico Bella
Despite the fact that perovskite solar cells (PSC) have a strong potential as a next-generation photovoltaic technology due to continuous efficiency improvements and the tunable properties, some important obstacles remain before industrialisation is feasible. For example, the selection of low-cost or easy-to-prepare materials is essential for back-contacts and hole-transporting layers. Likewise, the choice of conductive substrates, the identification of large-scale manufacturing techniques and the development of appropriate aging protocols are key objectives currently under investigation by the international scientific community...
October 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29077390/lab-on-chip-devices-gaining-ground-losing-size
#10
Veronica C Romao, Sofia A M Martins, Jose Germano, Filipe A Cardoso, Susana Cardoso, Paulo P Freitas
Portable analytical devices are notably gaining relevance in the panorama of urgent testing. Such devices have the potential to play an important role as easy-to-handle tools in critical situations. Epidemic infectious disease agents (e.g., Ebola virus, Coronavirus, Zika virus) could be controlled more easily by testing travelers on-site at the country borders to prevent outbreaks from spreading. The increasing incidence of hospital-acquired infections caused by antibiotic resistant pathogens could be minimized by point-of-care microbial analysis as well as rapid screening tests of bacteria resistance...
October 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/29073566/enhancement-of-operating-flux-in-a-membrane-bio-reactor-coupled-with-a-mechanical-sieve-unit
#11
Seongjun Park, Kyung-Min Yeon, Seheum Moon, Jong-Oh Kim
Filtration flux is one of the key factors in regulating the performance of membrane bio-reactors (MBRs) for wastewater treatment. In this study, we explore the effectiveness of a mechanical sieve unit for effective flux enhancement through retardation of the fouling effect in a modified MBR system (SiMBR). In brief, the coarse sieve unit having 100 μm and 50 μm permits small size microorganism flocs to adjust the biomass concentration from the suspended basin to the membrane basin. As a result, the reduced biofouling effect due to the lowered biomass concentration from 7800 mg/L to 2400 mg/L, enables higher flux through the membrane...
October 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/29063115/-trpv1-an-important-molecule-involved-in-the-peripheral-sensitization-during-chronic-pain-and-central-pain-modulation
#12
Ying Zhang, Yun Wang
As chronic pain is a severe problem in clinics, study of the mechanisms of chronic pain and development of novel analgesic agents is of significance. In the past decade, our lab completed a series of studies on the regulatory mechanisms of functional sensitization and membrane trafficking of transient receptor potential vanilloid type 1 (TRPV1), a key molecule involved in the development of peripheral sensitization. Our studies elucidated the important regulatory roles of several protein kinases, including PKD1 (protein kinase D1), Cdk5 (cyclin-dependent kinase 5) and LIMK (LIM-motif containing kinase), in inflammatory thermal hyperalgesia...
October 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/29055898/night-time-communication-at-stanford-university-hospital-perceptions-reality-and-solutions
#13
Andrew Jordan Sun, Libo Wang, Minjoung Go, Zac Eggers, Raymond Deng, Paul Maggio, Lisa Shieh
BACKGROUND: Resident work hour restrictions have led to the creation of the 'night float' to care for the patients of multiple primary teams after hours. These residents are often inundated with acute issues in the numerous patients they cover and are less able to address non-urgent issues that arise at night. Further, non-urgent pages may contribute to physician alarm fatigue and negatively impact patient outcomes. OBJECTIVE: To delineate the burden of non-urgent paging at night and propose solutions...
October 21, 2017: BMJ Quality & Safety
https://www.readbyqxmd.com/read/29042571/a-novel-technique-for-accelerated-culture-of-murine-mesenchymal-stem-cells-that-allows-for-sustained-multipotency
#14
Courtney M Caroti, Hyunhee Ahn, Hector F Salazar, Giji Joseph, Sitara B Sankar, Nick J Willett, Levi B Wood, W Robert Taylor, Alicia N Lyle
Bone marrow derived mesenchymal stem cells (MSCs) are regularly utilized for translational therapeutic strategies including cell therapy, tissue engineering, and regenerative medicine and are frequently used in preclinical mouse models for both mechanistic studies and screening of new cell based therapies. Current methods to culture murine MSCs (mMSCs) select for rapidly dividing colonies and require long-term expansion. These methods thus require months of culture to generate sufficient cell numbers for feasibility studies in a lab setting and the cell populations often have reduced proliferation and differentiation potential, or have become immortalized cells...
October 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29040201/don-t-call-me-crazy-delirium-occurs-outside-of-the-icu
#15
Anthony Cahill, Christopher Pearcy, Khalid Almahmoud, Vaidehi Agrawal, Usha Mani, Phillip Sladek, Michael S Truitt
INTRODUCTION: Delirium has been well studied among patients in the Intensive Care Unit (ICU); however, data beyond the ICU is limited. The purpose of this study is to prospectively evaluate the incidence and associated risk factors for delirium in non-critical care areas (NCCA). METHODS: After IRB approval, a prospective cohort study was conducted at our urban Level I Trauma Center from December 2015 to February 2016. All patients admitted to the designated study area by a trauma surgeon were included...
October 16, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29036895/low-cost-lab-on-chip-for-the-colorimetric-detection-of-nitrate-in-mineral-water-products
#16
Mohammad F Khanfar, Wisam Al-Faqheri, Ala'aldeen Al-Halhouli
The diagnostics of health status and the quality of drinking water are among the most important United Nations sustainable development goals. However, in certain areas, wars and instability have left millions of people setting in refugee camps and dangerous regions where infrastructures are lacking and rapid diagnostics of water quality and medical status are critical. In this work, microfluidic testing chips and photometric setups are developed in cheap and portable way to detect nitrate concentrations in water...
October 14, 2017: Sensors
https://www.readbyqxmd.com/read/29020802/recent-advances-in-the-systems-biology-of-aging
#17
Daniel Edward Lee Promislow, Mark A McCormick
<b><i>Significance</i></b>: Reductionist studies have contributed greatly to our understanding of the basic biology of aging in recent years but we still do not understand fundamental mechanisms for many identified drugs and pathways. Use of systems approaches will help us move forward in our understanding of aging. <b><i>Recent Advances</i></b>: Recent work described here has illustrated the power of systems biology to inform our understanding of aging through the study of 1) diet restriction; 2) neurodegenerative disease; and 3) biomarkers of aging...
October 12, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/29019959/recent-advances-in-nanoparticle-concentration-and-their-application-in-viral-detection-using-integrated-sensors
#18
REVIEW
Brian M Dincau, Yongkuk Lee, Jong-Hoon Kim, Woon-Hong Yeo
Early disease diagnostics require rapid, sensitive, and selective detection methods for target analytes. Specifically, early viral detection in a point-of-care setting is critical in preventing epidemics and the spread of disease. However, conventional methods such as enzyme-linked immunosorbent assays or cell cultures are cumbersome and difficult for field use due to the requirements of extensive lab equipment and highly trained personnel, as well as limited sensitivity. Recent advances in nanoparticle concentration have given rise to many novel detection methodologies, which address the shortcomings in modern clinical assays...
October 11, 2017: Sensors
https://www.readbyqxmd.com/read/29019110/long-term-laboratory-culture-causes-contrasting-shifts-in-tolerance-to-two-marine-pollutants-in-copepods-of-the-genus-tigriopus
#19
Patrick Y Sun, Helen B Foley, Leslie Wu, Charlene Nguyen, Shiven Chaudhry, Vivien W W Bao, Kenneth M Y Leung, Suzanne Edmands
Organismal chemical tolerance is often used to assess ecological risk and monitor water quality, yet tolerance can differ between field- and lab-raised organisms. In this study, we examined how tolerance to copper (Cu) and tributyltin oxide (TBTO) in two species of marine copepods, Tigriopus japonicus and T. californicus, changed across generations under benign laboratory culture (in the absence of pre-exposure to chemicals). Both copepod species exhibited similar chemical-specific changes in tolerance, with laboratory maintenance resulting in increased Cu tolerance and decreased TBTO tolerance...
October 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29018383/study-protocol-for-the-preschooler-regulation-of-emotional-stress-pres-procedure
#20
Livio Provenzi, Rafaela G M Cassiano, Giunia Scotto di Minico, Maria B M Linhares, Rosario Montirosso
Background: Emotional stress regulation (ESR) rapidly develops during the first months of age and includes different behavioral strategies which largely contribute to children's behavioral and emotional adjustment later in life. The assessment of ESR during the first years of life is critical to identify preschool children who are at developmental risk. Although ESR is generally included in larger temperament batteries [e.g., the Laboratory Temperament Assessment Battery (Lab-TAB)], there is no standardized observational procedure to specifically assess and measure ESR in preschool aged children...
2017: Frontiers in Psychology
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