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https://www.readbyqxmd.com/read/28340527/synthesis-and-adsorption-properties-of-4-vinylpyridine-and-styrene-copolymer-in-situ-immobilized-on-silica-surface
#1
E S Yanovska, L O Vretik, O A Nikolaeva, Y Polonska, D Sternik, O Yu Kichkiruk
Copolymer of 4-vinylpyridine with styrene was in situ immobilized on silica gel surface via the heterogeneous radical polymerization. Anchorage of the copolymer on the surface layer was confirmed by IR spectroscopy. The quantity of copolymer on the silica gel surface was evaluated as 25.73 wt.% by TG and DSC-MS analysis. "Islet" location of polymer layer on the silica surface was confirmed by the scanning electron microscopy. A high adsorption activity of silica gel with immobilized copolymer towards microquantitatives of Cu(II), Cd(II), Pb(II), Fe(III), and Ni(II) ions in steady state conditions as well as of Ni(II) ions in dynamic regime was found...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340522/tin-oxide-carbon-coated-sepiolite-nanofibers-with-enhanced-lithium-ion-storage-property
#2
Kai Hou, Xin Wen, Peng Yan, Aidong Tang, Huaming Yang
Natural sepiolite (Sep) nanofibers were coated with carbon and nanoscale SnO2 to prepare an emerging nanocomposite (SnO2-C@Sep), which exhibited enhanced electrochemical performance. Sepiolite could act as a steady skeleton, carbon coating principally led sepiolite from an isolated to an electric state, and decoration of nanoscale SnO2 was beneficial to the functionization of sepiolite. Cycling performances indicated that SnO2-C@Sep showed higher discharge capacities than commercial SnO2 after 50 cycles. The nanocomposite SnO2-C@Sep possessed enhanced lithium storage properties with stable capacity retention and low cost, which could open up a new strategy to synthesize a variety of functional hybrid materials based on the cheap and abundant clay and commercialization of lithium-metal oxide batteries...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28340507/understanding-the-contribution-of-disulphide-bridges-to-the-folding-and-misfolding-of-an-anti-a%C3%AE-scfv
#3
Laia Montoliu-Gaya, Jose C Martínez, Sandra Villegas
ScFv-h3D6 is a single chain variable fragment that precludes Aβ peptide-induced cytotoxicity by withdrawing Aβ oligomers from the amyloid pathway to the worm-like pathway. Production of scFv molecules is not a straightforward procedure because of the occurrence of disulphide scrambled conformations generated in the refolding process. Here, we separately removed the disulphide bond of each domain and solved the scrambling problem; and then, we intended to compensate the loss of thermodynamic stability by adding three C-terminal elongation mutations previously described to stabilize the native fold of scFv-h3D6...
March 24, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28340500/advanced-practice-registered-nurses-and-long-acting-reversible-contraception
#4
Patricia J Kelly, An-Lin Cheng, Kimberly Carlson, Jacki Witt
INTRODUCTION: Advanced practice registered nurses (APRNs) are in an excellent position to address the high rates of unintended pregnancy in the United States by providing long-acting reversible contraceptives (LARCs). These methods are significant in their effectiveness in preventing pregnancy in individual women and in having population-level effects on unintended pregnancy. The aim of this study was to learn more about APRN practices around long-acting reversible contraception and influences on those practices...
March 24, 2017: Journal of Midwifery & Women's Health
https://www.readbyqxmd.com/read/28340481/metabolic-profiling-of-tyrosine-tryptophan-and-glutamate-in-human-urine-using-gas-chromatography-tandem-mass-spectrometry-combined-with-single-spe-cleanup
#5
Hyun Ju Shin, Na Hyun Park, Wonwoong Lee, Man Ho Choi, Bong Chul Chung, Jongki Hong
The tyrosine, tryptophan, and glutamate metabolic pathways play key roles on pathological state of neuronal functions and the change of their levels in biological systems reflects the progress degree of neuronal diseases. Comprehensive profiling of these metabolites is important to find new biomarkers for diagnosis or prognosis of various neuronal diseases. However, the overall profiling analysis of various neurochemicals in biological sample is confronted with several limitations due to their low concentration and physicochemical properties and the coexistence of matrices...
March 16, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28340463/hypoxia-and-hydrogen-sulfide-differentially-affect-normal-and-tumor-derived-vascular-endothelium
#6
Serena Bianco, Daniele Mancardi, Annalisa Merlino, Benedetta Bussolati, Luca Munaron
BACKGROUND: endothelial cells play a key role in vessels formation both under physiological and pathological conditions. Their behavior is influenced by blood components including gasotransmitters (H2S, NO and CO). Tumor cells are subjected to a cyclic shift between pro-oxidative and hypoxic state and, in this scenario, H2S can be both cytoprotective and detrimental depending on its concentration. H2S effects on tumors onset and development is scarcely studied, particularly concerning tumor angiogenesis...
March 18, 2017: Redox Biology
https://www.readbyqxmd.com/read/28340447/fronto-limbic-disconnection-in-depressed-patients-with-suicidal-ideation-a-resting-state-functional-connectivity-study
#7
Lian Du, Jinkun Zeng, Huan Liu, Dejian Tang, Huaqing Meng, Yongmei Li, Yixiao Fu
BACKGROUND: Suicidal ideation (SI) is highly prevalent and a known symptom of Major Depressive Disorder (MDD), but its underlying biological mechanisms are relatively unknown. Several studies linked suicidal ideation to dysfunctional brain circuits, specifically fronto-limbic connections. The purpose of this work was to investigate fronto-limbic disconnection in MDD patients with or without SI. METHODS: MDD patients with SI (SI, n=28) or without SI (NSI, n=20), identified by the Scale for Suicide Ideation and healthy controls (HCs, n=30) underwent resting-state functional MRI scanning...
February 21, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28340440/bioaugmentation-with-hydrolytic-microbes-to-improve-the-anaerobic-biodegradability-of-lignocellulosic-agricultural-residues
#8
P Tsapekos, P G Kougias, S A Vasileiou, L Treu, S Campanaro, G Lyberatos, I Angelidaki
Bioaugmentation with hydrolytic microbes was applied to improve the methane yield of bioreactors fed with agricultural wastes. The efficiency of Clostridium thermocellum and Melioribacter roseus to degrade lignocellulosic matter was evaluated in batch and continuously stirred tank reactors (CSTRs). Results from batch assays showed that C. thermocellum enhanced the methane yield by 34%. A similar increase was recorded in CSTR during the bioaugmentation period; however, at steady-state the effect was noticeably lower (7...
March 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340432/reorganization-of-anterior-and-posterior-hippocampal-networks-associated-with-memory-performance-in-mesial-temporal-lobe-epilepsy
#9
Hong Li, Caihong Ji, Lujia Zhu, Peiyu Huang, Biao Jiang, Xiaojun Xu, Jianzhong Sun, Zhong Chen, Meiping Ding, Minming Zhang, Shuang Wang
OBJECTIVE: To investigate the pattern of functional demarcation of hippocampal network and its relationship with memory performance in mesial temporal lobe epilepsy (mTLE) with unilateral hippocampal sclerosis. METHODS: Resting state fMRI data were acquired from fifteen left mTLE patients, fourteen right mTLE patients and twenty healthy subjects. We explore the hippocampal-cortical alterations and corresponding inter-hemispheric functional connectivity (FC) across anterior and posterior hippocampal networks...
March 4, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28340424/less-money-more-problems-how-changes-in-disposable-income-affect-child-maltreatment
#10
Michael McLaughlin
A number of research studies have documented an association between child maltreatment and family income. Yet, little is known about the specific types of economic shocks that affect child maltreatment rates. The paucity of information is troubling given that more than six million children are reported for maltreatment annually in the U.S. alone. This study examines whether an exogenous shock to families' disposable income, a change in the price of gasoline, predicts changes in child maltreatment. The findings of a fixed-effects regression show that increases in state-level gas prices are associated with increases in state-level child maltreatment referral rates, even after controlling for demographic and other economic variables...
March 21, 2017: Child Abuse & Neglect
https://www.readbyqxmd.com/read/28340421/cannabis-use-patterns-and-motives-a-comparison-of-younger-middle-aged-and-older-medical-cannabis-dispensary-patients
#11
Nancy A Haug, Claudia B Padula, James E Sottile, Ryan Vandrey, Adrienne J Heinz, Marcel O Bonn-Miller
INTRODUCTION: Medical cannabis is increasingly being used for a variety of health conditions as more states implement legislation permitting medical use of cannabis. Little is known about medical cannabis use patterns and motives among adults across the lifespan. METHODS: The present study examined data collected at a medical cannabis dispensary in San Francisco, California. Participants included 217 medical cannabis patients who were grouped into age-defined cohorts (younger: 18-30, middle-aged: 31-50, and older: 51-72)...
March 9, 2017: Addictive Behaviors
https://www.readbyqxmd.com/read/28340416/nonradical-oxidation-from-electrochemical-activation-of-peroxydisulfate-at-ti-pt-anode-efficiency-mechanism-and-influencing-factors
#12
Haoran Song, Linxia Yan, Jun Ma, Jin Jiang, Guangqiang Cai, Wenjuan Zhang, Zhongxiang Zhang, Jiaming Zhang, Tao Yang
Electrochemical activation of peroxydisulfate (PDS) at Ti/Pt anode was systematically investigated for the first time in this work. The synergistic effect produced from the combination of electrolysis and the addition of PDS demonstrates that PDS can be activated at Ti/Pt anode. The selective oxidation towards carbamazepine (CBZ), sulfamethoxazole (SMX), propranolol (PPL), benzoic acid (BA) rather than atrazine (ATZ) and nitrobenzene (NB) was observed in electrochemical activation of PDS process. Moreover, addition of excess methanol or tert-butanol had negligible impact on CBZ (model compound) degradation, demonstrating that neither sulfate radical (SO4(-)) nor hydroxyl radical (HO) was produced in electrochemical activation of PDS process...
March 21, 2017: Water Research
https://www.readbyqxmd.com/read/28340354/mechanism-of-substrate-translocation-in-an-alternating-access-transporter
#13
Naomi R Latorraca, Nathan M Fastman, A J Venkatakrishnan, Wolf B Frommer, Ron O Dror, Liang Feng
Transporters shuttle molecules across cell membranes by alternating among distinct conformational states. Fundamental questions remain about how transporters transition between states and how such structural rearrangements regulate substrate translocation. Here, we capture the translocation process by crystallography and unguided molecular dynamics simulations, providing an atomic-level description of alternating access transport. Simulations of a SWEET-family transporter initiated from an outward-open, glucose-bound structure reported here spontaneously adopt occluded and inward-open conformations...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28340309/analytical-techniques-in-lipidomics-state-of-the-art
#14
Kamil Jurowski, Kamila Kochan, Justyna Walczak, Małgorzata Barańska, Wojciech Piekoszewski, Bogusław Buszewski
Current studies related to lipid identification and determination, or lipidomics in biological samples, are one of the most important issues in modern bioanalytical chemistry. There are many articles dedicated to specific analytical strategies used in lipidomics in various kinds of biological samples. However, in such literature, there is lack of articles dedicated to a comprehensive review of the actual analytical methodologies used in lipidomics. The aim of this article is to characterize the lipidomics methods used in modern bioanalysis according to the methodological point of view: 1) chromatography/separation methods, 2) spectroscopic methods and 3) mass spectrometry and also hyphenated methods...
March 24, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28340296/ultra-low-surface-recombination-velocity-in-passivated-ingaas-inp-nanopillars
#15
Aura Higuera-Rodriguez, Bruno Romeira, Simone Birindelli, Lachlan E Black, Barry Smalbrugge, Peter J van Veldhoven, Wilhelmus Erwin M M Kessels, Meint K Smit, Andrea Fiore
The III-V semiconductor InGaAs is a key material for photonics since it provides optical emission and absorption in the 1.55 μm telecommunication wavelength window. However, InGaAs suffers from pronounced non-radiative effects associated with its surface states, which affect the performance of nanophotonic devices for optical interconnects, namely nanolasers and nanodetectors. This work reports the strong suppression of surface recombination of undoped InGaAs/InP nanostructured semiconductor pillars using a combination of ammonium sulfide, (NH4)2S, passivation and silicon oxide, SiOx, coating...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28340273/genetic-diversity-and-selection-of-common-bean-lines-based-on-technological-quality-and-biofortification
#16
S de M Steckling, N D Ribeiro, F D Arns, H C Mezzomo, M T D F Possobom
The development of common bean cultivars with high technological quality that are biofortified with minerals, is required to meet the demand for food with health benefits. The objectives of this study were to evaluate whether common bean genotypes differ in terms of technological and mineral biofortification traits, to study the correlations between these characters, to analyze the genetic dissimilarity of common bean genotypes, and to select superior lines for these traits. For this, 14 common bean genotypes were evaluated in experiments conducted in three growing seasons in the Rio Grande do Sul State, Brazil...
March 22, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28340249/orthodontic-strain-affects-the-hippo-pathway-effector-yap-concomitant-with-proliferation-in-human-periodontal-ligament-fibroblasts
#17
Diana Huelter-Hassler, Pascal Tomakidi, Thorsten Steinberg, Britta A Jung
Objectives: During orthodontic tooth movement (OTM), human periodontal ligament fibroblasts (hPDLFs) sense, and respond to mechanical forces. Since the molecular constituents involved in these processes are not fully elucidated, the objective of the present study was to identify further key molecules of the cellular strain response. Materials and Methods: Primary hPDLFs were strained with a static equiaxial strain of 2.5 per cent for 15 minutes, 1 hour, 6 hours, and 24 hours...
March 17, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28340244/bupropion-administration-increases-resting-state-functional-connectivity-in-dorso-medial-prefrontal-cortex
#18
Ewelina Rzepa, Zola Dean, Ciara McCabe
Background: Patients on the selective serotonergic re-uptake inhibitors (SSRI) like citalopram report emotional blunting. We have shown previously that citalopram reduces resting-state functional connectivity (RSFC) in healthy volunteers in a number of brain regions including the dorso-medial prefrontal cortex, which may be related to its clinical effects. Bupropion is a dopaminergic and noradrenergic re-uptake inhibitor (DNRI) and is not reported to cause emotional blunting. However how bupropion affects RSFC in healthy controls remains unknown...
March 11, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28340237/pain-and-cognition-in-multiple-sclerosis
#19
R Scherder, N Kant, E Wolf, A C M Pijnenburg, E Scherder
Objective. : The goal of the present study was to examine the relationship between pain and cognition in patients with multiple sclerosis. Design. : Cross-sectional. Setting. : Nursing home and personal environment of the investigators. Subjects. : Two groups of participants were included: 91 patients with multiple sclerosis and 80 matched control participants. Methods. : The level of pain was measured by the following pain scales: Number of Words Chosen-Affective, Colored Analogue Scale for pain intensity and suffering from pain, and the Faces Pain Scale...
March 15, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28340233/increase-in-drug-overdose-deaths-involving-fentanyl-rhode-island-january-2012-march-2014
#20
Melissa C Mercado, Steven A Sumner, M Bridget Spelke, Michele K Bohm, David E Sugerman, Christina Stanley
Objective.:  This study identified sociodemographic, substance use, and multiple opioid prescriber and dispenser risk factors among drug overdose decedents in Rhode Island, in response to an increase in overdose deaths (ODs) involving fentanyl. Methods.:  This cross-sectional investigation comprised all ODs reviewed by Rhode Island's Office of the State Medical Examiners (OSME) during January 2012 to March 2014. Data for 536 decedents were abstracted from OSME's charts, death certificates, toxicology reports, and Prescription Monitoring Program (PMP) databases...
March 6, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
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