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https://www.readbyqxmd.com/read/29149501/the-weakly-coordinating-tris-trichlorosilyl-silyl-anion
#1
Marian Olaru, Maxie F Hesse, Elena Rychagova, Sergey Ketkov, Stefan Mebs, Jens Beckmann
Closely following the procedure for the preparation of the base-stabilized dichlorosilylene complex NHCDipp∙SiCl2 by Roesky and Stalke et al. (Angew. Chem. Int. Ed. 2009, 48, 5683-5686), besides the reported by-product [NHCDipp-H+∙∙∙Cl-], few crystals of the salt [NHCDipp-H∙∙∙Cl∙∙∙H-NHCDipp]Si(SiCl3)3 were isolated and characterized by X-ray crystallography (NHCDipp = N,N-di(2,6-isopropylphenyl)-imidazo-2-ylidene). They feature the weakly-coordinating anion Si(SiCl3)3-, which was more rationally obtained in high yields upon deprotonation of conjugate Brønsted acid HSi(SiCl3)3 with NHCDipp or PMP (PMP = 1,2,2,6,6-pentamethylpiperidine)...
November 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29149422/interrelationships-among-hydrogen-permeation-physiochemical-properties-and-early-adsorption-abilities-of-titanium
#2
Fang Jia, Lei Zhou, Wangxi Wu
This study aimed to investigate if the titanium samples with low hydrogen permeation which treated with a novel etching combination: phosphoric acid and sodium fluoride could influence the surface physiochemical properties and early adsorption ability. Titanium samples were treated with three different concentrations of the new formula, as groups A, B and C, and treated with the traditional etching formula, as group T. Zeta potential, contact angle, X-ray photoelectron spectroscopy (XPS) and fibronectin (FN)/vitronectin (VN) adsorption of Sprague-Dawley (SD) rat tibial osteotomies in the initial 30min and MG-63 adsorption in the initial 24 h were detected...
November 17, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29149235/isolated-complexes-of-the-amino-acid-arginine-with-polyether-and-polyamine-macrocycles-the-role-of-proton-transfer
#3
Juan Ramón Avilés-Moreno, Giel Berden, Jos Oomens, Bruno Martínez-Haya
The distinct basicity of the guanidinium side-group of arginine (Arg) sustains specific interactions involved in essential biochemical processes. The sensing of arginine is therefore key in modern biotechnology and bioanalysis. In this context, the development of molecular receptors based on crown ether building blocks has demonstrated great potential. We investigate the complexes formed by arginine with two benchmark macrocycles, 12-crown-4 (1,4,7,10-tetraoxacyclododecane) and its N-substituted analog cyclen (1,4,7,10-tetraazacyclododecane)...
November 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29148788/temperature-dependent-empirical-parameters-for-polarity-in-choline-chloride-based-deep-eutectic-solvents
#4
Arun Valvi, Jyoti Dutta, Shraeddha Tiwari
Deep eutectic solvents have emerged as a promising and economically viable alternative to address our need for environmentally benign media. Efficient utilization of deep eutectic solvents in various fields will require adequate knowledge about their physicochemical properties. In this work, independent polarity scales pertaining to solvent polarizability, dipolarity, acidity and basicity have been determined for some commonly used deep eutectic solvents based on choline chloride. The three eutectic mixtures selected for the study include reline (1:2 mixture of choline chloride and urea), ethaline (1:2 mixture of choline chloride and ethylene glycol) and glyceline (1:2 mixture of choline chloride and glycerol)...
November 17, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29148396/multiple-reassorted-viruses-as-cause-of-highly-pathogenic-avian-influenza-a-h5n8-virus-epidemic-the-netherlands-2016
#5
Nancy Beerens, Rene Heutink, Saskia A Bergervoet, Frank Harders, Alex Bossers, Guus Koch
In 2016, an epidemic of highly pathogenic avian influenza A virus subtype H5N8 in the Netherlands caused mass deaths among wild birds, and several commercial poultry farms and captive bird holdings were affected. We performed complete genome sequencing to study the relationship between the wild bird and poultry viruses. Phylogenetic analysis showed that the viruses are related to H5 clade 2.3.4.4 viruses detected in Russia in May 2016 but contained novel polymerase basic 2 and nucleoprotein gene segments and 2 different variants of the polymerase acidic segment...
December 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/29147099/changes-in-quality-characteristics-of-pork-patties-containing-antioxidative-fish-skin-peptide-or-fish-skin-peptide-loaded-nanoliposomes-during-refrigerated-storage
#6
Jing-Jing Bai, Jung-Gyu Lee, Sang-Yoon Lee, Soojin Kim, Mi-Jung Choi, Youngjae Cho
Marine fish skin peptides (FSP) have been widely studied due to their antioxidant and antimicrobial properties. We aimed to use a natural antioxidant, FSP, to replacing synthetic preservatives in a pork patty model, which is safer for human body. Moreover, nano-liposome technology can be applied for masking the fishy smell and improving the stability of this peptide. Therefore, in this study, the effects of FSP and FSP-loaded liposomes (FSPL) on pork patty were evaluated through the tests of thiobarbituric acid reactive substances (TBARS), color, cooking loss, texture, volatile basic nitrogen (VBN), and the pH value, during 14 d of refrigerated (4°C) storage...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29147096/meat-quality-and-storage-characteristics-of-pork-loin-marinated-in-grape-pomace
#7
Hyun-Joo Lee, Jae-Joon Lee, Myung-Ok Jung, Jung-Seok Choi, Ji-Taek Jung, Yang-Il Choi, Jin-Kyu Lee
This study investigated the meat quality and storage characteristics of pork loin marinated in grape pomace powder during different storage periods. The experimental design included six treatments : pork loin containing only 100% water (Control, C); pork loin containing a combination of 20% grape pomace and 80% water (T1); pork loin containing a combination of 40% grape pomace and 60% water (T2); pork loin containing a combination of 0.5% grape pomace powder and 95.5% water (T3); pork loin containing a combination of 1...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29147085/a-comparison-of-the-essential-amino-acid-content-and-the-retention-rate-by-chicken-part-according-to-different-cooking-methods
#8
Honggyun Kim, Hyun Wook Do, Heajung Chung
This study set out to identify the changes in the nutrient contents during the chicken cooking process as basic data for the establishment of a national health nutrition policy. Samples were produced using 3 chicken parts (wing, breast, and leg) and 7 cooking methods (boiling, pancooking, pan-frying, deep-frying, steaming, roasting, and microwaving), and the essential amino acid contents, principal components, and retention rates were analyzed. Weight loss was observed in all chicken parts with all cooking methods...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146325/study-of-human-salivary-proline-rich-proteins-interaction-with-food-tannins
#9
Susana Soares, Ignacio García-Estévez, Raúl Ferrer-Galego, Natércia F Brás, Elsa Brandão, Mafalda Silva, Natércia Teixeira, Fátima Fonseca, Sérgio F Sousa, Frederico Ferreira-da-Silva, Nuno Mateus, Victor de Freitas
In this work, saturation transfer difference-NMR, isothermal microcalorimetry and molecular dynamics simulations have been used to study the individual interactions between basic, glycosylated and acidic proline-rich proteins (bPRPS, gPRPs, aPRPs) and P-B peptide with some representative food tannins [procyanidin B2, procyanidin B2 3'-O-gallate (B2g) and procyanidin trimer (catechin-4-8-catechin-4-8-catechin)]. Results showed that P-B peptide was in general the salivary protein (SP) with higher affinity whereas aPRPs showed lower affinity to the studied procyanidins...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29146319/developing-a-machine-vision-system-for-simultaneous-prediction-of-freshness-indicators-based-on-tilapia-oreochromis-niloticus-pupil-and-gill-color-during-storage-at-4%C3%A2-c
#10
Ce Shi, Jianping Qian, Shuai Han, Beilei Fan, Xinting Yang, Xiaoming Wu
The study assessed the feasibility of developing a machine vision system based on pupil and gill color changes in tilapia for simultaneous prediction of total volatile basic nitrogen (TVB-N), thiobarbituric acid (TBA) and total viable counts (TVC) during storage at 4°C. The pupils and gills were chosen and color space conversion among RGB, HSI and L(∗)a(∗)b(∗) color spaces was performed automatically by an image processing algorithm. Multiple regression models were established by correlating pupil and gill color parameters with TVB-N, TVC and TBA (R(2)=0...
March 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29145081/elimination-of-chlorine-refractory-carbamazepine-by-breakpoint-chlorination-reactive-species-and-oxidation-byproducts
#11
Wen-Long Wang, Qian-Yuan Wu, Ye Du, Nan Huang, Hong-Ying Hu
Breakpoint chlorination can be commonly observed in the chlorination of water treatments when ammonia is present. In this study, it was found that breakpoint chlorination can remarkably eliminate a ubiquitous and chlorine-refractory micropollutant, carbamazepine (CBZ), with the removal of 72% at neutral condition. At neutral pH, low CBZ elimination was observed at a chlorine/ammonia molar ratio (Cl/N) of 1.0 and higher CBZ elimination was observed as Cl/N ratio increased from 1.0 to 1.6 (breakpoint), indicating that CBZ elimination was closely related to the generation and decomposition of chloramines...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29145018/nitrogen-phosphorus-dual-doped-molybdenum-carbide-molybdenum-phosphide-carbon-nanospheres-for-efficient-hydrogen-evolution-over-the-whole-ph-range
#12
Jing-Qi Chi, Wen-Kun Gao, Jia-Hui Lin, Bin Dong, Kai-Li Yan, Jun-Feng Qin, Zi-Zhang Liu, Yong-Ming Chai, Chen-Guang Liu
MoO4(2-)@aniline-pyrrole (MoO4(2-)@polymer) spheres as precursors have been used to synthesize unique core-shell nanostructure consisting of molybdenum carbide and molybdenum phosphide composites encapsulated into uniformly dual N, P-doped carbon shells (Mo2C/MoP@NPC) through a facile two-step strategy. Firstly, porous core-shell N-doped Mo2C@C (Mo2C@NC) nanospheres have been synthesized with ultrafine Mo2C nanoparticles as core and ultrathin NC as shell by a annealing route. Secondly, Mo2C/MoP@NPC has been obtained maintaining intact spherical-like morphology through a phosphidation reaction in high temperature...
November 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29144445/critical-review-on-the-significance-of-olive-phytochemicals-in-plant-physiology-and-human-health
#13
REVIEW
Irene Gouvinhas, Nelson Machado, Carla Sobreira, Raúl Domínguez-Perles, Sónia Gomes, Eduardo Rosa, Ana I R N A Barros
Olive oil displays remarkable organoleptic and nutritional features, which turn it into a foodstuff appreciated by consumers, and a basic component of the Mediterranean diet. Indeed, the noticed benefits of including olive oil in the diet have been assigned to the presence of diverse bioactive compounds with different molecular structures. These compounds confer a wide range of biological properties to this food matrix, including the prevention of distinct human diseases as well as the modulation of their severity...
November 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143945/one-evidence-of-cocaine-and-amphetamine-regulated-transcript-cart-has-the-bidirectional-effects-on-appetite-in-siberian-sturgeon-acipenser-baerii
#14
Xin Zhang, Yundi Gao, Ni Tang, Jinwen Qi, Yuanbing Wu, Jin Hao, Shuyao Wang, Defang Chen, Zhiqiong Li
Cocaine- and amphetamine-regulated transcript (CART), discovered in 1995, with various biological functions, has received much attention recently due to its role in the regulation of appetite in mammals. However, the function of CART on the appetite control in fish species is still not very clear. In this study, Siberian sturgeon (Acipenser baerii Brandt) cart gene was cloned for the first time, and the cart mRNA levels in 11 feeding-related tissues was investigated. The Siberian sturgeon cart gene sequence was 1459 base pairs (bp), including a 3'-terminal untranslated region (3'-UTR) of 39 bp, a 5'-terminal untranslated region (5'-UTR) of 52 bp, and an open reading frame (ORF) of 348 bp encoding 115 amino acids...
November 16, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/29143920/distinguishing-the-disease-associated-snps-based-on-composition-frequency-analysis
#15
Wenling Li, Menglong Li, Xuemei Pu, Yanzhi Guo
Single-nucleotide polymorphism (SNP) is a basical variation in genome. When SNPs occur at the binding sites of microRNA, they can influence the binding efficiency, cause a fluctuation of the mRNA in vivo, and thus arouse posttranscriptional level abnormality. Therefore, SNP has a strong correlation with diseases. Although enormous SNPs have been experimentally identified, only a tiny proportion of them are truly disease-associated SNPs (dSNPs) that relate to microRNA modification and then are involved in disease causing process...
November 16, 2017: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/29143298/a-single-nucleotide-mutation-of-ispf-gene-involved-in-the-mep-pathway-for-isoprenoid-biosynthesis-causes-yellow-green-leaf-phenotype-in-rice
#16
Rui Huang, Yang Wang, Pingrong Wang, Chunmei Li, Fuliang Xiao, Nenggang Chen, Na Li, Caixia Li, Changhui Sun, Lihua Li, Rongjun Chen, Zhengjun Xu, Jianqing Zhu, Xiaojian Deng
We identified IspF gene through yellow-green leaf mutant 505ys in rice. OsIspF was expressed in all tissues detected, and its encoded protein was targeted to the chloroplast. On expression levels of genes in this mutant, OsIspF itself and the genes encoding other enzymes of the MEP pathway and chlorophyll synthase were all up-regulated, however, among eight genes associated with photosynthesis, only psaA, psaN and psbA genes for three reaction center subunits of photosystem obviously changed. Isoprenoids are the most abundant natural compounds in all organisms, which originate from the basic five-carbon units isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP)...
November 15, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/29143215/combining-cationic-and-anionic-mixed-mode-sorbents-in-a-single-cartridge-to-extract-basic-and-acidic-pharmaceuticals-simultaneously-from-environmental-waters
#17
Daniela Salas, Francesc Borrull, Núria Fontanals, Rosa Maria Marcé
The aim of the present study is to broaden the applications of mixed-mode ion-exchange solid-phase extraction sorbents to extract both basic and acidic compounds simultaneously by combining the sorbents in a single cartridge and developing a simplified extraction procedure. Four different cartridges containing negative and positive charges in the same configuration were evaluated and compared to extract a group of basic, neutral, and acidic pharmaceuticals selected as model compounds. After a thorough optimization of the extraction conditions, the four different cartridges showed to be capable of retaining basic and acidic pharmaceuticals simultaneously through ionic interactions, allowing the introduction of a washing step with 15 mL methanol to eliminate interferences retained by hydrophobic interactions...
November 15, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29143196/effect-of-low-dose-aspirin-on-chronic-acid-reflux-esophagitis-in-rats
#18
Takahiro Masuda, Fumiaki Yano, Nobuo Omura, Kazuto Tsuboi, Masato Hoshino, Se Ryung Yamamoto, Shunsuke Akimoto, Hideyuki Kashiwagi, Katsuhiko Yanaga
BACKGROUND: Clinical role of low-dose aspirin (LDA) in pathogenesis of gastroesophageal reflux disease is by far controversial. This can be attributed to the paucity of basic research detailing the mechanism of LDA-induced esophageal mucosal injury (EI) on underlying chronic acid reflux esophagitis (RE). AIM: The aim of this study was to clarify the effect of LDA on chronic RE in rats. METHODS: Esophagitis was induced in 8-week-old male Wistar rats by ligating the border between forestomach and glandular portion with a 2-0 silk tie and covering the duodenum with a small piece of 18-Fr Nélaton catheter...
November 15, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29143031/acid-base-machines-electrical-work-from-neutralization-reactions
#19
Gilberto Lima, William G Morais, Wellington J A S Gomes, Fritz Huguenin
We have developed an electrochemical system that performs electrical work due to changes in alkaline ion and proton activities associated with acidic solution neutralization. This system can be used to treat wastewater, contributing to sustainable growth. The system includes an electrochemical machine that operates between an acidic and a basic reservoir to produce work in cycles comprising four stages: two isothermal ionic insertion/de-insertion steps and two steps involving acid and base injection. On the basis of the mixing free energy associated with the reaction free energy, we have developed the thermodynamic formalism by considering reversible electrochemical processes to determine the maximum work performed by this acid-base machine and the efficiency...
November 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29142828/metabolic-engineering-of-ustilago-trichophora-tz1-for-improved-malic-acid-production
#20
Thiemo Zambanini, Hamed Hosseinpour Tehrani, Elena Geiser, Christiane K Sonntag, Joerg M Buescher, Guido Meurer, Nick Wierckx, Lars M Blank
Ustilago trichophora RK089 has been found recently as a good natural malic acid producer from glycerol. This strain has previously undergone adaptive laboratory evolution for enhanced substrate uptake rate resulting in the strain U. trichophora TZ1. Medium optimization and investigation of process parameters enabled titers and rates that are able to compete with those of organisms overexpressing major parts of the underlying metabolic pathways. Metabolic engineering can likely further increase the efficiency of malate production by this organism, provided that basic genetic tools and methods can be established for this rarely used and relatively obscure species...
June 2017: Metabolic Engineering Communications
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