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https://www.readbyqxmd.com/read/27922830/ligand-receptor-binding-kinetics-in-surface-plasmon-resonance-cells-a-monte-carlo-analysis
#1
Jacob Carroll, Matthew Raum, Kimberly Forsten-Williams, Uwe C Täuber
Surface plasmon resonance (SPR) chips are widely used to measure association and dissociation rates for the binding kinetics between two species of chemicals, e.g., cell receptors and ligands. It is commonly assumed that ligands are spatially well mixed in the SPR region, and hence a mean-field rate equation description is appropriate. This approximation however ignores the spatial fluctuations as well as temporal correlations induced by multiple local rebinding events, which become prominent for slow diffusion rates and high binding affinities...
December 6, 2016: Physical Biology
https://www.readbyqxmd.com/read/27922825/model-of-turnover-kinetics-in-the-lamellipodium-implications-of-slow-and-fast-diffusing-capping-protein-and-arp2-3-complex
#2
Laura M McMillen, Dimitrios Vavylonis
Cell protrusion through polymerization of actin filaments at the leading edge of motile cells may be influenced by spatial gradients of diffuse actin and regulators. Here we study the distribution of two of the most important regulators, capping protein and Arp2/3 complex, which regulate actin polymerization in the lamellipodium through capping and nucleation of free barbed ends. We modeled their kinetics using data from prior single molecule microscopy experiments on XTC cells. These experiments have provided evidence for a broad distribution of diffusion coefficients of both capping protein and Arp2/3 complex...
December 6, 2016: Physical Biology
https://www.readbyqxmd.com/read/27920532/the-effect-of-magnetic-nanoparticles-on-neuronal-differentiation-of-induced-pluripotent-stem-cell-derived-neural-precursors
#3
Klára Jiráková, Monika Šeneklová, Daniel Jirák, Karolína Turnovcová, Magda Vosmanská, Michal Babič, Daniel Horák, Pavel Veverka, Pavla Jendelová
INTRODUCTION: Magnetic resonance (MR) imaging is suitable for noninvasive long-term tracking. We labeled human induced pluripotent stem cell-derived neural precursors (iPSC-NPs) with two types of iron-based nanoparticles, silica-coated cobalt zinc ferrite nanoparticles (CZF) and poly-l-lysine-coated iron oxide superparamagnetic nanoparticles (PLL-coated γ-Fe2O3) and studied their effect on proliferation and neuronal differentiation. MATERIALS AND METHODS: We investigated the effect of these two contrast agents on neural precursor cell proliferation and differentiation capability...
2016: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/27917826/improved-radiation-dose-efficiency-in-solution-saxs-using-a-sheath-flow-sample-environment
#4
Nigel Kirby, Nathan Cowieson, Adrian M Hawley, Stephen T Mudie, Duncan J McGillivray, Michael Kusel, Vesna Samardzic-Boban, Timothy M Ryan
Radiation damage is a major limitation to synchrotron small-angle X-ray scattering analysis of biomacromolecules. Flowing the sample during exposure helps to reduce the problem, but its effectiveness in the laminar-flow regime is limited by slow flow velocity at the walls of sample cells. To overcome this limitation, the coflow method was developed, where the sample flows through the centre of its cell surrounded by a flow of matched buffer. The method permits an order-of-magnitude increase of X-ray incident flux before sample damage, improves measurement statistics and maintains low sample concentration limits...
December 1, 2016: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/27913801/the-pressure-reduction-coefficient-a-new-parameter-to-assess-aneurysmal-blood-stasis-induced-by-flow-diverters-disruptors
#5
Gregory Gascou, Riccardo Ferrara, Dominique Ambard, Mathieu Sanchez, Kyriakos Lobotesis, Franck Jourdan, Vincent Costalat
BACKGROUND AND PURPOSE: Pore density (PD), surface metal coverage (SMC) and the number of wires are all different parameters which can influence the efficacy of a flow disruptor/diverter. Nevertheless, the relative importance of a parameter to induce intra-aneurysmal blood stasis is still poorly evaluated. Therefore, comparison between devices based on a unique value is not reliable. The aim of this study was to propose a new bench top parameter (the pressure reduction coefficient (PRC; ξ)) in order to assess the global haemodynamic effect of each flow diverter/disruptor to slow flow...
December 2, 2016: Interventional Neuroradiology
https://www.readbyqxmd.com/read/27911823/continuous-flow-synthesis-of-zsm-5-zeolite-on-the-order-of-seconds
#6
Zhendong Liu, Kotatsu Okabe, Chokkalingam Anand, Yasuo Yonezawa, Jie Zhu, Hiroki Yamada, Akira Endo, Yutaka Yanaba, Takeshi Yoshikawa, Koji Ohara, Tatsuya Okubo, Toru Wakihara
The hydrothermal synthesis of zeolites carried out in batch reactors takes a time so long (typically, on the order of days) that the crystallization of zeolites has long been believed to be very slow in nature. We herein present a synthetic process for ZSM-5, an industrially important zeolite, on the order of seconds in a continuous flow reactor using pressurized hot water as a heating medium. Direct mixing of a well-tuned precursor (90 °C) with the pressurized water preheated to extremely high temperature (370 °C) in the millimeter-sized continuous flow reactor resulted in immediate heating to high temperatures (240-300 °C); consequently, the crystallization of ZSM-5 in a seed-free system proceeded to completion within tens of or even several seconds...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27911807/enhanced-limonene-production-in-cyanobacteria-reveals-photosynthesis-limitations
#7
Xin Wang, Wei Liu, Changpeng Xin, Yi Zheng, Yanbing Cheng, Su Sun, Runze Li, Xin-Guang Zhu, Susie Y Dai, Peter M Rentzepis, Joshua S Yuan
Terpenes are the major secondary metabolites produced by plants, and have diverse industrial applications as pharmaceuticals, fragrance, solvents, and biofuels. Cyanobacteria are equipped with efficient carbon fixation mechanism, and are ideal cell factories to produce various fuel and chemical products. Past efforts to produce terpenes in photosynthetic organisms have gained only limited success. Here we engineered the cyanobacterium Synechococcus elongatus PCC 7942 to efficiently produce limonene through modeling guided study...
November 23, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27908612/polyvinyl-alcohol-terminal-chemoembolization-for-hepatocellular-carcinoma-with-hepatic-arteriovenous-shunts-safety-efficacy-and-prognostic-factors
#8
Qiu-Song Liu, Que-Lin Mei, Yan-Hao Li
PURPOSE: To evaluate the safety and efficacy of polyvinyl alcohol (PVA) terminal chemoembolization and to identify the prognostic factors associated with survival in hepatocellular carcinoma (HCC) patients with hepatic arteriovenous shunts (HAVS). MATERIALS AND METHODS: Of 133 patients' managements were retrospectively analyzed. HAVS was classified into three types: slow-flow, intermediate-flow and high-flow. The size of the PVA used was determined following the scheme: slow-flow HAVS: 300-500μm PVA; intermediate-flow HAVS: 500-710μm PVA; high-flow HAVS: 710-1000μm PVA...
April 30, 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27904445/endovascular-treatment-of-unruptured-aneurysms-of-cavernous-and-ophthalmic-segment-of-internal-carotid-artery-with-flow-diverter-device-pipeline
#9
Marko Jevsek, Charbel Mounayer, Tomaz Seruga
BACKGROUND: Intra-arterial treatment of aneurysms by redirecting blood flow is a newer method. The redirection is based on a significantly more densely braided wire stent. The stent wall keeps the blood in the lumen of the stent and slows down the turbulent flow in the aneurysms. Stagnation of blood in the aneurysm sac leads to the formation of thrombus and subsequent exclusion of the aneurysm from the circulation. The aim of the study was to evaluate flow diverter device Pipeline for broad neck and giant aneurysm treatment...
December 1, 2016: Radiology and Oncology
https://www.readbyqxmd.com/read/27903394/-correlation-between-epicardial-adipose-tissue-thickness-and-slow-flow-of-non-obstructive-coronary-artery
#10
Q Wu, B Yang
Objective: To investigate the correlation between epicardial adipose thickness and slow flow of non-obstructive coronary artery. Methods: Clinical data of patients with coronary angiography examination evidenced stenosis<50% in our department from May 2014 to May 2015 were retrospectively analyzed.According to the level of TIMI in angiography, patients were divided into slow blood flow group (TIMI Ⅰ-Ⅱ, n=16) and normal blood flow group (TIMI Ⅲ, n=127). All epicardial adipose thickness was determined by echocardiography and data of biochemical data (fibrinogen, whole blood viscosity at high shear rate, erythrocyte aggregation index, platelet count, and platelet aggregation rate) were also analyzed...
November 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27890764/spontaneous-spinal-epidural-hematoma-a-study-of-55-cases-focused-on-the-etiology-and-treatment-strategy
#11
Jiaxing Yu, Jiang Liu, Chuan He, Liyong Sun, Sishi Xiang, Yongjie Ma, Lisong Bian, Tao Hong, Jian Ren, Pengyu Tao, Jingwei Li, Guilin Li, Feng Ling, Hongqi Zhang
BACKGROUND: Spontaneous spinal epidural hematoma (SSEH) is a rare neurological emergency of the spinal cord. Its etiology and treatment strategy remain controversial. This study aimed to evaluate a significant cause of SSEH and to discuss the treatment strategy according to the clinical outcomes of patients in two institutions. METHODS: Fifty-five cases of SSEH treated at our institutions between February 2002 and February 2016 were retrospectively analyzed. RESULT: The mean age of the first SSEH onset was 31...
November 24, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27882440/hemodynamic-changes-in-a-middle-cerebral-artery-aneurysm-at-follow-up-times-before-and-after-its-rupture-a-case-report-and-a-review-of-the-literature
#12
A Sejkorová, K D Dennis, H Švihlová, O Petr, G Lanzino, A Hejčl, D Dragomir-Daescu
Hemodynamic parameters play a significant role in the development of cerebral aneurysms. Parameters such as wall shear stress (WSS) or velocity could change in time and may contribute to aneurysm growth and rupture. However, the hemodynamic changes at the rupture location remain unclear because it is difficult to obtain data prior to rupture. We analyzed a case of a ruptured middle cerebral artery (MCA) aneurysm for which we acquired imaging data at three time points, including at rupture. A patient with an observed MCA aneurysm was admitted to the emergency department with clinical symptoms of a subarachnoid hemorrhage...
November 24, 2016: Neurosurgical Review
https://www.readbyqxmd.com/read/27882184/phosphorylation-of-osteopontin-has-proapoptotic-and-proinflammatory-effects-on-human-knee-osteoarthritis-chondrocytes
#13
Shu-Guang Gao, Yang Yu, Chao Zeng, Shi-Tao Lu, Jian Tian, Chao Cheng, Liang-Jun Li, Guang-Hua Lei
The aim of the present study was to investigate the effects of phosphorylated osteopontin (p-OPN) on apoptosis and pro-inflammatory cytokine expression in human knee osteoarthritis (OA) chondrocytes. Human knee OA chondrocytes obtained from patients who underwent total knee arthroplasty were treated with p-OPN, OPN or buffer. Reverse transcription quantitative-polymerase chain reaction (RT-qPCR) and western blot analysis were used to assess the expression levels of proinflammatory factors, including interleukin (IL)-1β, tumor necrosis factor (TNF)-α, IL-6 and nuclear factor (NF)-κB...
November 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/27878810/improvement-of-phytoplankton-culture-isolation-using-single-cell-sorting-by-flow-cytometry
#14
Dominique Marie, Florence Le Gall, Roseline Edern, Priscillia Gourvil, Daniel Vaulot
Flow cytometry provides a tool to physically sort single algal cells in order to obtain clonal cultures. During sorting, cells are submitted to physical stress factors such as high fluidic pressure, exposure to the laser beam, electrostatic charges, deflection through high voltage fields and collisions with container surfaces. All of these can damage the cells of interest and success rates for initiation of cultures from flow-sorted cells are generally very low. We found that the addition of Bovine Serum Albumin (BSA) in the culture medium into which cells are sorted drastically improved the success of initiation of pico- and nano-eukaryotic phytoplankton strains...
November 22, 2016: Journal of Phycology
https://www.readbyqxmd.com/read/27878143/membrane-less-organic-inorganic-aqueous-flow-batteries-with-improved-cell-potential
#15
P K Leung, T Martin, A A Shah, M A Anderson, J Palma
A membrane-less organic-inorganic flow battery based on zinc and quinone species is proposed. By virtue of the slow dissolution rate of the deposited anode (<11.5 mg h(-1) cm(-2)), the battery has a cell voltage of ca. 1.52 V with an average energy efficiency of ca. 73% at 30 mA cm(-2) over 12 cycles.
December 6, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27876012/phase-i-study-of-low-dose-metronomic-temozolomide-for-recurrent-malignant-gliomas
#16
Eric T Wong, Joshua Timmons, Amy Callahan, Lauren O'Loughlin, Bridget Giarusso, David C Alsop
BACKGROUND: The treatment goal for recurrent malignant gliomas centers on disease stabilization while minimizing therapy-related side effects. Metronomic dosing of cytotoxic chemotherapy has emerged as a promising option to achieve this objective. METHODS: This phase I study was performed using metronomic temozolomide (mTMZ) at 25 or 50 mg/m(2)/day continuously in 42-day cycles. Correlative studies were incorporated using arterial spin labeling MRI to assess tumor blood flow, analysis of matrix metalloproteinase-2 (MMP-2) and MMP-9 activities in the cerebrospinal fluid (CSF) as surrogates for tumor angiogenesis and invasion, as well as determination of CSF soluble interleukin-2 receptor alpha (sIL-2Rα) levels as a marker of immune modulation...
November 22, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27874865/direct-observation-of-subpicosecond-vibrational-dynamics-in-photoexcited-myoglobin
#17
C Ferrante, E Pontecorvo, G Cerullo, M H Vos, T Scopigno
Determining the initial pathway for ultrafast energy redistribution within biomolecules is a challenge, and haem proteins, for which energy can be deposited locally in the haem moiety using short light pulses, are suitable model systems to address this issue. However, data acquired using existing experimental techniques that fail to combine sufficient structural sensitivity with adequate time resolution have resulted in alternative hypotheses concerning the interplay between energy flow among highly excited vibrational levels and potential concomitant electronic processes...
December 2016: Nature Chemistry
https://www.readbyqxmd.com/read/27873169/evaluation-for-the-efficacy-and-safety-of-the-crosser-catheter-as-a-cto-crossing-device-and-a-flossing-device
#18
Michinao Tan, Kazushi Urasawa, Ryoji Koshida, Takuya Haraguchi, Shunsuke Kitani, Yuya Nakagawa, Yasumi Igarashi, Katsuhiko Sato
The Crosser catheter is a unique device that facilitates antegrade intraluminal recanalization by high-frequency vibration energy and cavitation. We used this device not only as a chronic total occlusion (CTO) crossing device, but also as a flossing device in stenotic lesions and we also evaluated the efficacy of this device when used with both the "Crosser preceding" and the "Guidewire preceding" in CTOs. Complications related to this device were investigated, too. We retrospectively analyzed a total of 90 consecutive patients with peripheral artery disease in the femoropopliteal artery and below-the-knee artery (BTA)...
November 21, 2016: Cardiovascular Intervention and Therapeutics
https://www.readbyqxmd.com/read/27873108/flushing-in-neuro-endocrinology
#19
REVIEW
Fady Hannah-Shmouni, Constantine A Stratakis, Christian A Koch
Cutaneous flushing is a common presenting complaint in endocrine disorders. The pathophysiology of flushing involves changes in cutaneous blood flow triggered by multiple intrinsic factors that are either related to physiology or disease. Flushing can be divided into episodic or persistent causes. Episodic flushing is mediated by the release of endogenous vasoactive mediators or medications, while persistent flushing results in a fixed facial erythema with telangiectasia and cyanosis due to slow-flowing deoxygenated blood in large cutaneous blood vessels...
November 21, 2016: Reviews in Endocrine & Metabolic Disorders
https://www.readbyqxmd.com/read/27871789/effect-of-dry-heating-and-ionic-gum-on-the-physicochemical-and-release-properties-of-starch-from-dioscorea
#20
Deepika Vashisht, Anima Pandey, Anca Hermenean, Maria Josefa Yáñez-Gascón, Horacio Pérez-Sánchez, K Jayaram Kumar
To meet the ever increasing industrial demand for excipients with desirable properties, modified starch is regarded as an alternative to it. With this in mind, the present study focuses on the modification of starches of Dioscorea from Jharkhand (India) using dry heat treatment with and without ionic gum. Modified starches were prepared using sodium alginate (1% w/w). Native and modified starches were subjected to heat treatment at 130°C for 2h and 4h. The effect of heating and ionic gum on the properties of Dioscorea starch was investigated...
November 18, 2016: International Journal of Biological Macromolecules
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