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https://www.readbyqxmd.com/read/28735456/inferring-foliar-water-uptake-using-stable-isotopes-of-water
#1
Gregory R Goldsmith, Marco M Lehmann, Lucas A Cernusak, Matthias Arend, Rolf T W Siegwolf
A growing number of studies have described the direct absorption of water into leaves, a phenomenon known as foliar water uptake. The resultant increase in the amount of water in the leaf can be important for plant function. Exposing leaves to isotopically enriched or depleted water sources has become a common method for establishing whether or not a plant is capable of carrying out foliar water uptake. However, a careful inspection of our understanding of the fluxes of water isotopes between leaves and the atmosphere under high humidity conditions shows that there can clearly be isotopic exchange between the two pools even in the absence of a change in the mass of water in the leaf...
July 22, 2017: Oecologia
https://www.readbyqxmd.com/read/28735341/the-effect-of-nanosecond-high-voltage-electric-pulses-on-the-shape-and-permeability-of-polymersome-guvs
#2
Tina Batista Napotnik, Gianluca Bello, Eva-Kathrin Sinner, Damijan Miklavčič
Polymersomes, vesicles composed of block copolymers, are promising candidates as membrane alternatives and functional containers, e.g., as potential carriers for functional molecules because of their stability and tunable membrane properties. In the scope of possible use for membrane protein delivery to cells by electrofusion, we investigated the cytotoxicity of such polymersomes as well as the effects of nanosecond electric pulses with variable repetition rate on the shape and permeability of polymersomes in buffers with different conductivities...
July 22, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28735223/isomeric-separation-and-quantitation-of-di-2-ethylhexyl-trimellitates-and-mono-2-ethylhexyl-trimellitates-in-blood-by-lc-ms-ms
#3
Christine Höllerer, Johannes Müller, Thomas Göen, Elisabeth Eckert
A new and fast HPLC-method for the simultaneous determination of tri-(2-ethylhexyl) trimellitate (TOTM or TEHTM), its diesters 2,4-di-(2-ethylhexyl) trimellitate (2,4-DEHTM), 1,4-di-(2-ethylhexyl) trimellitate (1,4-DEHTM), 1,2-di-(2-ethylhexyl) trimellitate (1,2-DEHTM) and monoesters 1-mono-(2-ethylhexyl) trimellitate (1-MEHTM), 2-mono-(2-ethylhexyl) trimellitate (2-MEHTM) and 4-mono-(2-ethylhexyl) trimellitate (4-MEHTM) together with di-(2-ethylhexyl) phthalate (DEHP) and its primary metabolite mono-(2-ethylhexyl) phthalate (MEHP) in blood was developed and validated...
July 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28735215/estimation-of-individual-axon-bundle-properties-by-a-multi-resolution-discrete-search-method
#4
Ricardo Coronado-Leija, Alonso Ramirez-Manzanares, Jose Luis Marroquin
A stable, accurate and robust-to-noise method for the estimation of the intra-voxel bundle-wise diffusion properties for diffusion-weighted magnetic resonance imaging is presented. The proposed method overcomes some of the limitations of most of the multi-fiber algorithms in the literature and extends them to estimate the diffusion profiles, improving the estimation of the intra-voxel geometry at challenging microstructure configurations, that is to say: relatively small crossing angles, different voxel-wise anisotropic diffusion profiles and low SNR...
June 29, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28735206/electrochemical-treatment-of-biologically-pre-treated-dairy-wastewater-using-dimensionally-stable-anodes
#5
Vlasia Markou, Maria-Christina Kontogianni, Zacharias Frontistis, Athanasia G Tekerlekopoulou, Alexandros Katsaounis, Dimitris Vayenas
In this work, electrochemical oxidation of aerobically pre-treated dairy wastewaters using IrO2-Pt coated dimensionally stable anodes was investigated. It was found that IrO2/Ti electrode outperforming Pt/Ti and IrO2-Pt/Ti at lower current densities, while Pt/Ti achieved better efficiency at higher current density. Among the different parameters which were studied, the current density was the most crucial for the efficiency of the process. A current density of 100 mA/cm(2) led to almost complete removal of 3700 mg/L COD after 360 min of treatment using IrO2/Ti electrode and 0...
July 20, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28735197/synthesis-of-porous-polymer-based-solid-amine-adsorbent-effect-of-pore-size-and-amine-loading-on-co2-adsorption
#6
Fenglei Liu, Shuixia Chen, Yanting Gao
A series of porous polymers was synthesized by a suspension polymerization of divinylbenzene (DVB) and ethylene glycol dimethyl acrylate (EGDMA), which was further functionalized with polyethyleneimine (PEI) for CO2 capture. The results showed that the synthesized DVB and EGDMA (DE) copolymers were an effective support for loading PEI because of its larger pore size and specific surfaces area. It was found that DE (30, 10) loaded with 30wt% PEI exhibited a higher CO2 adsorption amount of 3.28mmol/g at 25°C under dry condition...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735196/molecular-dynamics-simulation-of-sodium-dodecylsulfate-sds-bilayers
#7
Hongshu Zhang, Shiling Yuan, Jichao Sun, Jianqiang Liu, Haiping Li, Na Du, Wanguo Hou
Sodium dodecylsulfate (SDS) - a simple single tailed surfactant (STS) can form stable vesicles from its micellar solution without any additives under the mediation of solid surfaces. To further understand the mechanism of this transition on the molecular level, molecular dynamics simulations are performed to study segments of SDS bilayers (as part of vesicles) in the bulk solution systematically, at the moment that the lower leaflet of bilayers already detached from solid surfaces. The SDS membrane would rather keep their bilayers structure than return to micelles when the initial interdigitated degree (δi) between alkyl chains is more than 8...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735173/detached-mindfulness-reduced-both-depression-and-anxiety-in-elderly-women-with-major-depressive-disorders
#8
Mohammad Ahmadpanah, Tayebe Akbari, Amineh Akhondi, Mohammad Haghighi, Leila Jahangard, Dena Sadeghi Bahmani, Hafez Bajoghli, Edith Holsboer-Trachsler, Serge Brand
We investigated the influence of detached mindfulness (DM) in treating symptoms of depression and anxiety among elderly women. Thirty-four elderly females (mean age: 69.23 years) suffering from moderate major depressive disorders (MDD) and treated with a standard medication (citalopram) at therapeutic doses were randomly assigned either to an intervention condition (DM; group treatment, twice weekly) or to a control condition (with leisure activities, twice weekly). At baseline (BL), four weeks later at study completion (SC), and four weeks after that at follow-up (FU), participants completed ratings for symptoms of depression and anxiety; experts blind to patients' group assignments rated patients' symptoms of depression...
July 15, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28735167/first-observation-of-metal-ion-induced-structural-fluctuations-of-%C3%AE-helical-peptides-by-using-diffracted-x-ray-tracking
#9
Daiki Usui, Satomi Inaba, Hiroshi Sekiguchi, Yuji C Sasaki, Toshiki Tanaka, Masayuki Oda
In order to analyze protein structural dynamics, we designed simple model peptides whose structures changed from random-coil to helix-bundle structures by forming stable hydrophobic core in the presence of metal ions. The strategy involved destabilizing a de novo designed three helix-bundle protein by substituting the residues present in its hydrophobic core with histidine and small amino acids. The conformational changes of peptides induced upon binding of Zn(2+) to histidine were analyzed using circular dichroism spectroscopy, which revealed peptides, HA and HG, to be good candidates for further analyses...
July 14, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28735093/stable-isotope-labeling-by-fatty-acids-in-cell-culture-silfac-coupled-with-isotope-pattern-dependent-mass-spectrometry-for-global-screening-of-lipid-hydroperoxide-mediated-protein-modifications
#10
Ryo Takahashi, Shuhei Fujioka, Tomoyuki Oe, Seon Hwa Lee
Lipid hydroperoxide-mediated modifications of proteins are receiving increasing attention because of their possible involvement in various degenerative diseases. These biological effects are attributed to the ability of lipid peroxidation-derived aldehydes to react with the nucleophilic sites of proteins. Here we describe a methodology involving metabolic labeling coupled with mass spectrometry-based proteomic analysis that enables global screening of lipid hydroperoxide-mediated protein modifications in a cell system...
July 19, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28735086/a-series-of-population-models-for-hyphantria-cunea-with-delay-and-seasonality
#11
Haixia Lu, Haitao Song, Huaiping Zhu
In this paper, we establish and study a basic stage-structured model for the population of Hyphantria cunea, a delay differentialequation model and a model incorporating the resource and seasonality. By introducing the population reproduction number R0, we show that R0 acts as a threshold parameter for the existence and stability of equilibria. The trivial equilibria of the above models are all globally asymptotically stable when R0<1; the basic model and the delay-differential model have a unique positive equilibrium respectively, and they are both locally asymptotically stable when R0>1; the model with periodic season is uniformly persistent and admits a positive periodic solution if R0>1...
July 19, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28735081/anti-inflammatory-activity-of-cecropin-a2-from-musca-domestica
#12
Rui-Yang Wei, Jie Bai, Meng-Fei Zhao, Bin Xu, Wen-Jia Li, Feng-Xian Wei, Yan-Yan Xi, Shao-Yu Li
This study aimed to investigate the anti-inflammatory activity of Musca domestica cecropin-A2 (Mdc-A2) toward Staphylococcus aureus (S. aureus) to learn more about their immunological functions. RAW264.7 cells were transfected with recombinant lentiviruses introduce pLEX-Mdc-A2into the RAW264.7 cell line (RAW-Mdc-A2). The RAW264.7 cell line with empty pLEX (RAW-pLEX) was produced in the same manner as a negative control. Real-time quantitative reverse transcription PCR (RT-PCR) was performed to analyze the mRNA expression of TNF-a, IL-1β, NFκB-1 and NFκB-2 in S...
July 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28735060/individual-roles-of-brain-and-serum-alcohol-dehydrogenase-isoforms-in-regulation-of-alcohol-consumption-in-spf-wistar-rats
#13
Vsevolod V Pavshintsev, Nikita A Mitkin, Olga Y Frolova, Ekaterina A Kushnir, Olga A Averina, Maxim L Lovat
Alcohol dehydrogenases (ADH) are key enzymes of ethanol metabolism that mediate its oxidation to acetaldehyde. ADHs are also able to oxidize some types of neurotransmitters such as dopamine, serotonin and norepinephrine. Increased level of ADHs activity, induced by chronic alcohol consumption, is presumably associated with disturbed neurotransmitters metabolism that leads to stable alcohol craving. As earlier reported, intraperitoneal administration of 4-methilpirasole (non-specific inhibitor of ADHs) has shown to provide a short-term anti-alcoholic effect, but individual roles of ADH isoforms in this process were still unclear...
July 19, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28735041/self-assembled-polypeptide-nanoparticles-for-intracellular-irinotecan-delivery
#14
N N Zashikhina, M V Volokitina, V A Korzhikov-Vlakh, I I Tarasenko, A Lavrentieva, T Scheper, E Rhuel, R V Orlova, T B Tennikova, E G Korzhikova-Vlakh
In this research poly(l-lysine)-b-poly(l-leucine) (PLys-b-PLeu) polymersomes were developed. It was shown that the size of nanoparticles depended on pH of self-assembly process and varied from 180 to 650nm. The biodegradation of PLys-b-PLeu nanoparticles was evaluated using in vitro polypeptide hydrolysis in two model enzymatic systems, as well as in human blood plasma. The experiments of the visualization of cellular uptake of rhodamine 6g-loaded and fluorescein-labeled nanoparticles were carried out, which approved the possibility of their penetration into the cells...
July 19, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28735029/peptide-modification-of-polyimide-insulated-microwires-towards-improved-biocompatibility-through-reduced-glial-scarring
#15
Sangita Sridar, Matthew A Churchward, Vivian K Mushahwar, Kathryn G Todd, Anastasia L Elias
The goal of this study is to improve the integration of implanted microdevices with tissue in the central nervous system (CNS). The long-term utility of neuroprosthetic devices implanted in the CNS is affected by the formation of a scar by resident glial cells (astrocytes and microglia), limiting the viability and functional stability of the devices. Reduction in the proliferation of glial cells is expected to enhance the biocompatibility of devices. We demonstrate the modification of polyimide-insulated microelectrodes with a bioactive peptide KHIFSDDSSE...
July 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28735002/immobilization-of-%C3%AE-galactosidase-on-surface-modified-cobalt-multiwalled-carbon-nanotube-nanocomposite-improves-enzyme-stability-and-resistance-to-inhibitor
#16
Maryam Khan, Qayyum Husain, Rani Bushra
The present study aimed to work out a high yield procedure for immobilization of Aspergillus oryzae β-galactosidase on polyaniline cobalt multiwalled carbon nanotubes nanocomposite (PANI/Co/MWCNTNC) by physical adsorption and covalent attachment via glutaraldehyde. The binding was confirmed by scanning and transmission electron microscopy along with Fourier transform-infrared spectroscopy. The immobilization yields obtained for adsorbed and cross-linked enzymes were 93% and 97%, respectively. The covalently immobilized enzyme was remarkably more stable at extremes of pH and temperature compared to native and adsorbed enzymes...
July 19, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28734976/structural-basis-of-the-substrate-specificity-and-instability-in-solution-of-a-glycosidase-from-lactobacillus-plantarum
#17
Iván Acebrón, Laura Plaza-Vinuesa, Blanca de Las Rivas, Rosario Muñoz, J Cumella, F Sánchez-Sancho, José Miguel Mancheño
Statistics from structural genomics initiatives reveal that around 50-55% of the expressed, non-membrane proteins cannot be purified and therefore structurally characterized due to solubility problems, which emphasized protein solubility as one of the most serious concerns in structural biology projects. Lactobacillus plantarum CECT 748(T) produces an aggregation-prone glycosidase (LpBgl) that we crystallized previously. However, this result could not be reproduced due to protein instability and therefore further high-resolution structural analyses of LpBgl were impeded...
July 19, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28734940/role-of-orbitofrontal-sulcogyral-pattern-on-lifetime-cannabis-use-and-depressive-symptoms
#18
Yann Chye, Nadia Solowij, Eleni P Ganella, Chao Suo, Murat Yücel, Albert Batalla, Janna Cousijn, Anna E Goudriaan, Rocio Martin-Santos, Sarah Whittle, Cali F Bartholomeusz, Valentina Lorenzetti
Orbitofrontal cortex (OFC) sulcogyral patterns are stable morphological variations established early in life. They consist of three distinct pattern types, with Type III in particular being associated with poor regulatory control (e.g., high sensation seeking and negative emotionality, low constraint), which may confer risk for earlier onset of cannabis (CB) use and greater use in later life. The OFC sulcogyral pattern may therefore be a stable trait marker in understanding individual differences in substance-use vulnerability and associated affective disturbances in users...
July 19, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28734937/longitudinal-examination-of-resilience-after-traumatic-brain-injury-a-traumatic-brain-injury-model-systems-study
#19
Jennifer H Marwitz, Adam P Sima, Jeffrey S Kreutzer, Laura E Dreer, Thomas F Bergquist, Ross Zafonte, Douglas Johnson-Greene, Elizabeth R Felix
OBJECTIVE: To evaluate the trajectory of resilience during the first year following a moderate-severe TBI, factors associated with resilience at 3, 6 and 12-months post-injury, and changing relationships over time between resilience and other factors. DESIGN: Longitudinal analysis of an observational cohort. SETTING: Five inpatient rehabilitation centers. PARTICIPANTS: Patients with TBI (N = 195) enrolled in the resilience module of the TBI Model Systems study with data collected at 3, 6, and 12-month follow-up...
July 19, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28734911/plaque-rupture-in-coronary-atherosclerosis-is-associated-with-increased-plaque-structural-stress
#20
Charis Costopoulos, Yuan Huang, Adam J Brown, Patrick A Calvert, Stephen P Hoole, Nick E J West, Jonathan H Gillard, Zhongzhao Teng, Martin R Bennett
OBJECTIVES: The aim of this study was to identify the determinants of plaque structural stress (PSS) and the relationship between PSS and plaques with rupture. BACKGROUND: Plaque rupture is the most common cause of myocardial infarction, occurring particularly in higher risk lesions such as fibroatheromas. However, prospective intravascular ultrasound-virtual histology studies indicate that <10% higher risk plaques cause clinical events over 3 years, indicating that other factors also determine plaque rupture...
July 13, 2017: JACC. Cardiovascular Imaging
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