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https://www.readbyqxmd.com/read/29350515/rapid-one-pot-microwave-synthesis-of-mixed-linker-hybrid-zeolitic-imidazolate-framework-membranes-for-tunable-gas-separations
#1
Febrian Hillman, Jordan Brito, Hae-Kwon Jeong
The relatively slow and complex fabrication processes of polycrystalline metal-organic framework (MOF) membranes often times restrict their way to commercialization, despite their potential for molecular separation applications. Herein we report a rapid one-pot microwave synthesis of mixed linker hybrid zeolitic-imidazolate framework (ZIF) membranes consisting of 2-methylimidazolate (ZIF-8 linker) and benzimidazolate (ZIF-7 linker) linkers, termed ZIF-7-8 membranes. The fast-volumetric microwave heating in conjunction with unique counter diffusion of metal and linker solutions enabled unprecedented rapid synthesis of well-intergrown ZIF-7-8 membranes in ~ 90 s, the fastest MOF membrane preparation up to date...
January 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29324251/potential-role-of-plasmodium-falciparum-exported-protein-1-in-the-chloroquine-mode-of-action
#2
Andreas Martin Lisewski, Joel Patrick Quiros, Monica Mittal, Nagireddy Putluri, Arun Sreekumar, Jesper Z Haeggström, Olivier Lichtarge
In the human malaria parasite Plasmodium falciparum, membrane glutathione S-transferases (GST) have recently emerged as potential cellular detoxifying units and as drug target candidates with the artemisinin (ART) class of antimalarials inhibiting their activity at single-digit nanomolar potency when activated by iron sources such as cytotoxic hematin. Here we put forward the hypothesis that the membrane GST Plasmodium falciparum exported protein 1 (PfEXP1, PF3D7_1121600) might be directly involved in the mode of action of the unrelated antimalarial 4-aminoquinoline drug chloroquine (CQ)...
December 27, 2017: International Journal for Parasitology, Drugs and Drug Resistance
https://www.readbyqxmd.com/read/29315857/engineered-transport-in-microporous-materials-and-membranes-for-clean-energy-technologies
#3
REVIEW
Changyi Li, Stephen M Meckler, Zachary P Smith, Jonathan E Bachman, Lorenzo Maserati, Jeffrey R Long, Brett A Helms
Many forward-looking clean-energy technologies hinge on the development of scalable and efficient membrane-based separations. Ongoing investment in the basic research of microporous materials is beginning to pay dividends in membrane technology maturation. Specifically, improvements in membrane selectivity, permeability, and durability are being leveraged for more efficient carbon capture, desalination, and energy storage, and the market adoption of membranes in those areas appears to be on the horizon. Herein, an overview of the microporous materials chemistry driving advanced membrane development, the clean-energy separations employing them, and the theoretical underpinnings tying membrane performance to membrane structure across multiple length scales is provided...
January 8, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29306844/exploration-of-polyelectrolyte-incorporated-with-triton-x-114-surfactant-based-osmotic-agent-for-forward-osmosis-desalination
#4
Saikat Sinha Ray, Shiao Shing Chen, Nguyen Cong Nguyen, Hau Thi Nguyen, Nguyen Phuoc Dan, Bui Xuan Thanh, Le Thuy Trang
Selection of a proper osmotic agent is important to make the forward osmosis (FO) feasible. The objective of this study was to enhance FO by lowering reverse solute flux and maintaining high water flux. Poly(propylene glycol) with molecular weight of 725 Da (PPG-725) was found to possess high osmolality, making it a strong candidate for using as a draw agent. In addition, to reduce the partial leakage of draw solute, a non-ionic surfactant (Triton X-114) has been incorporated. Typically, when the hydrophobic tails of Triton X-114 interacted with the membrane surface, a layer on the surface of membrane is produced to constrict the pores and thus minimize the reverse solute flux...
January 4, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29306703/trace-organic-contaminant-rejection-by-aquaporin-forward-osmosis-membrane-transport-mechanisms-and-membrane-stability
#5
Ming Xie, Wenhai Luo, Hao Guo, Long D Nghiem, Chuyang Y Tang, Stephen R Gray
We investigated transport mechanisms of trace organic contaminants (TrOCs) through aquaporin thin-film composite forward osmosis (FO) membrane, and membrane stability under extreme conditions with respect to TrOC rejections. Morphology and surface chemistry of the aquaporin membrane were characterised to identify the incorporation of aquaporin vesicles into membrane active layer. Pore hindrance model was used to estimate aquaporin membrane pore size as well as to describe TrOC transport. TrOC transport mechanisms were revealed by varying concentration and type of draw solutions...
December 28, 2017: Water Research
https://www.readbyqxmd.com/read/29295623/superior-antifouling-capability-of-hydrogel-forward-osmosis-membrane-for-treating-wastewaters-with-high-concentration-of-organic-foulants
#6
Detao Qin, Zhaoyang Liu, Zhi Liu, Hongwei Bai, Darren Delai Sun
Wastewaters with high concentrations of organic pollutants pose a great challenge for membrane filtration due to their severe fouling propensity. In this study, a hydrogel forward osmosis (FO) membrane is explored for treating wastewaters of high concentration organic pollutants. This FO membrane has an ultrathin hydrogel selective layer, which is highly hydrophilic (water contact angle: as low as 18°) and smooth (surface roughness: <5 nm). Investigated with typical organic foulants (protein, alginate, humic acid, and oil) of high concentration (2000 ~ 20000 mg/L), this hydrogel FO membrane exhibits remarkably superior antifouling capability, with its water flux decline ratio lower than a quarter of commercial FO membrane's under identical experimental conditions...
January 3, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29290078/is-300-seconds-act-safe-and-efficient-during-miecc-procedures
#7
Adrian Bauer, Harald Hausmann, Jan Schaarschmidt, Michal Szlapka, Martin Scharpenberg, Thomas Eberle, J Michael Hasenkam
INTRODUCTION:  The recommended minimum activated clotting time (ACT) level for cardiopulmonary bypass (CPB) of 480 seconds originated from investigations with bubble oxygenators and uncoated extracorporeal circulation (ECC) systems. Modern minimal invasive ECC (MiECC) systems are completely closed circuits containing a membrane oxygenator and a tip-to-tip surface coating. We hypothesized that surface coating and the "closed-loop" design allow the MiECC to safely run with lower ACT levels and that an ACT level of 300 seconds can be safely applied without thromboembolic complications...
December 31, 2017: Thoracic and Cardiovascular Surgeon
https://www.readbyqxmd.com/read/29283402/real-time-monitoring-and-analysis-of-zebrafish-electrocardiogram-with-anomaly-detection
#8
Michael Lenning, Joseph Fortunato, Tai Le, Isaac Clark, Ang Sherpa, Soyeon Yi, Peter Hofsteen, Geethapriya Thamilarasu, Jingchun Yang, Xiaolei Xu, Huy-Dung Han, Tzung K Hsiai, Hung Cao
Heart disease is the leading cause of mortality in the U.S. with approximately 610,000 people dying every year. Effective therapies for many cardiac diseases are lacking, largely due to an incomplete understanding of their genetic basis and underlying molecular mechanisms. Zebrafish (Danio rerio) are an excellent model system for studying heart disease as they enable a forward genetic approach to tackle this unmet medical need. In recent years, our team has been employing electrocardiogram (ECG) as an efficient tool to study the zebrafish heart along with conventional approaches, such as immunohistochemistry, DNA and protein analyses...
December 28, 2017: Sensors
https://www.readbyqxmd.com/read/29278486/mesh-embedded-polysulfone-psu-sulfonated-polysulfone-spsu-supported-thin-film-composite-membranes-for-forward-osmosis
#9
Yuntao Zhao, Xiao Wang, Yiwei Ren, Desheng Pei
In this work, mesh-embedded polysulfone (PSU)/sulfonated polysulfone (sPSU) supported thin film composite (TFC) membranes were developed for forward osmosis (FO). The robust mesh integrated in PSU/sPSU sublayer imparts impressive mechanical durability. The blending of hydrophilic sPSU in PSU sublayer affects the hydrophilicity, porosity, pore structure and pore size of mesh-embedded PSU/sPSU substrates, and the total thickness, crosslinking degree and roughness of the corresponding TFC-FO membrane active layers...
December 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29262355/regulation-of-contraction-by-the-thick-filaments-in%C3%A2-skeletal-muscle
#10
REVIEW
Malcolm Irving
Contraction of skeletal muscle cells is initiated by a well-known signaling pathway. An action potential in a motor nerve triggers an action potential in a muscle cell membrane, a transient increase of intracellular calcium concentration, binding of calcium to troponin in the actin-containing thin filaments, and a structural change in the thin filaments that allows myosin motors from the thick filaments to bind to actin and generate force. This calcium/thin filament mediated pathway provides the "START" signal for contraction, but it is argued that the functional response of the muscle cell, including the speed of its contraction and relaxation, adaptation to the external load, and the metabolic cost of contraction is largely determined by additional mechanisms...
December 19, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/29246492/three-steroid-binding-globulins-their-localization-in-the-brain-and-nose-and-what-they-might-be-doing-there
#11
J D Caldwell, K Londe, S D Ochs, Z Hajdu, A Rodewald, V M Gebhart, G F Jirikowski
Steroid-binding globulins (SBGs) such as sex hormone binding globulin, corticosteroid binding globulin, and vitamin-D binding protein are receiving increasing notice as being actively involved in steroid actions. This paper reviews data of all three of these SBGs, focusing on their presence and possible activity in the brain and nose. We have found all three proteins in the brain in limbic areas such as the paraventricular (PVN) and supraoptic nuclei (SON) as well as other areas of the hypothalamus, hippocampus, and medial preoptic area...
December 12, 2017: Steroids
https://www.readbyqxmd.com/read/29243094/hierarchical-design-of-artificial-proteins-and-complexes-toward-synthetic-structural-biology
#12
REVIEW
Ryoichi Arai
In multiscale structural biology, synthetic approaches are important to demonstrate biophysical principles and mechanisms underlying the structure, function, and action of bio-nanomachines. A central goal of "synthetic structural biology" is the design and construction of artificial proteins and protein complexes as desired. In this paper, I review recent remarkable progress of an array of approaches for hierarchical design of artificial proteins and complexes that signpost the path forward toward synthetic structural biology as an emerging interdisciplinary field...
December 14, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/29242368/lessons-from-ckd-related-genetic-association-studies-moving-forward
#13
Sophie Limou, Nicolas Vince, Afshin Parsa
Over the past decade, genetic association studies have uncovered numerous determinants of kidney function in the general, diabetic, hypertensive, CKD, ESRD, and GN-based study populations (e.g., IgA nephropathy, membranous nephropathy, FSGS). These studies have led to numerous novel and unanticipated findings, which are helping improve our understanding of factors and pathways affecting both normal and pathologic kidney function. In this review, we report on major discoveries and advances resulting from this rapidly progressing research domain...
December 14, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29241113/concentrating-molasses-distillery-wastewater-using-biomimetic-forward-osmosis-fo-membranes
#14
N Singh, I Petrinic, C Hélix-Nielsen, S Basu, M Balakrishnan
Treatment of sugarcane molasses distillery wastewater is challenging due to the presence of complex phenolic compounds (melanoidins and polyphenols) having antioxidant properties. Due to zero liquid discharge regulations, Indian distilleries continue to explore effective treatment options. This work examines the concentration of distillery wastewater by forward osmosis (FO) using aquaporin biomimetic membranes and magnesium chloride hexahydrate (MgCl2.6H2O) as draw solution. The operational parameters viz. feed solution and draw solution flow rate and draw solution concentration were optimized using 10% v/v melanoidins model feed solution...
December 8, 2017: Water Research
https://www.readbyqxmd.com/read/29228156/feedback-regulation-of-tgf-%C3%AE-signaling
#15
Xiaohua Yan, Xiangyang Xiong, Ye-Guang Chen
Transforming growth factor beta (TGF-β) is a multi-functional polypeptide that plays a critical role in regulating a broad range of cellular functions and physiological processes. Signaling is initiated when TGF-β ligands bind to two types of cell membrane receptors with intrinsic Ser/Thr kinase activity and transmitted by the intracellular Smad proteins, which act as transcription factors to regulate gene expression in the nucleus. Although it is relatively simple and straight-forward, this TGF-β/Smad pathway is regulated by various feedback loops at different levels, including the ligand, the receptor, Smads and transcription, and is thus fine-tuned in terms of signaling robustness, duration, specificity, and plasticity...
December 8, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/29210702/effects-of-tannic-acid-on-membrane-fouling-and-membrane-cleaning-in-forward-osmosis
#16
Wanzhu Zhang, Lin Wang, Bingzhi Dong
The fouling behavior during forward osmosis (FO) was investigated. Tannic acid was used as a model organic foulant for natural organic matter analysis since the main characteristics are similar, and calcium ions were added at different concentrations to explore the anti-pollution capability of FO membranes. The initial permeate flux and calcium ions strength were varied in different operating conditions to describe membrane fouling with membrane cleaning methods. The observed flux decline in FO changed dramatically with the type of foulant and the type of draw solution used to provide the osmotic driving force...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29210126/crosslink-of-calcium-and-sodium-signalling-in-health-and-disease
#17
Alexei Verkhratsky, Mohamed Trebak, Fabiana Perocchi, Daniel Khananishvili, Israel Sekler
Transmembrane ionic gradients, that are indispensable feature of life, are utilised for generation of cytosolic ionic signals that regulate a host of cellular functions. Intracellular signalling mediated by Ca2+ and Na+ is tightly linked through several molecular pathways that generate Ca2+ and Na+ fluxes and are in turn regulated by both ions. Transient receptor potential (TRP) channels bridge endoplasmic reticulum Ca2+ release with generation of Na+ and Ca2+ currents. Plasmalemmal Na+ /Ca2+ exchanger by flickering between forward and reverse mode coordinates influx and efflux of both ions with membrane polarisation and cytosolic ion concentration...
December 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29209647/targeting-ras-will-gpr31-deliver-us-a-new-path-forward
#18
Nicole Fehrenbacher, Mark R Philips
Effective anti-rat sarcoma viral oncogene (RAS) therapies have remained the holy grail of cancer treatment. Mutant Kirsten rat sarcoma viral oncogene homolog (KRAS) sustains tumorigenesis when linked to the plasma membrane (PM). The G protein-coupled receptor 31 (GPR31) is now identified to mediate KRAS membrane association and is crucial for proliferation, survival and macropinocytosis of KRAS-dependent cancer cells, suggesting that GPR31 is a druggable target for anti-RAS therapy.
2017: Molecular & Cellular Oncology
https://www.readbyqxmd.com/read/29197818/application-of-volume-retarded-osmosis-and-low-pressure-membrane-hybrid-process-for-water-reclamation
#19
Sung-Ju Im, Jungwon Choi, Jung-Gil Lee, Sanghyun Jeong, Am Jang
A new concept of volume-retarded osmosis and low-pressure membrane (VRO-LPM) hybrid process was developed and evaluated for the first time in this study. Commercially available forward osmosis (FO) and ultrafiltration (UF) membranes were employed in a VRO-LPM hybrid process to overcome energy limitations of draw solution (DS) regeneration and production of permeate in the FO process. To evaluate its feasibility as a water reclamation process, and to optimize the operational conditions, cross-flow FO and dead-end mode UF processes were individually evaluated...
November 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29187555/complementary-metrics-of-human-auditory-nerve-function-derived-from-compound-action-potentials
#20
Kelly C Harris, Kenneth I Vaden, Carolyn M McClaskey, James W Dias, Judy R Dubno
Declines in auditory nerve (AN) function contribute to suprathreshold auditory processing and communication deficits in individuals with normal hearing, hearing loss, hyperacusis, and tinnitus. Procedures to characterize AN loss or dysfunction in humans are limited. We report several novel complementary metrics using the compound action potential (CAP), a direct measure of summated AN activity. Together, these metrics may be used to characterize AN function noninvasively in humans. We examined how these metrics change with stimulus intensity, and interpreted these changes within a framework of known physiological properties of the basilar membrane and AN...
November 29, 2017: Journal of Neurophysiology
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