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https://www.readbyqxmd.com/read/28239706/structure-and-dynamic-nmr-behavior-of-rhodium-complexes-supported-by-lewis-acidic-group-13-metallatranes
#1
James T Moore, Nicholas E Smith, Connie C Lu
Monovalent Rh was installed into the group 13 metallatranes, M[N(o-(NCH2P((i)Pr)2)C6H4)3] (where M = Al and Ga, abbreviated as ML) to generate Rh → M bonds in the parent complexes, Cl-RhAlL (1-Cl) and Cl-RhGaL (2-Cl). The electron-withdrawing nature of the group 13 metalloids was probed by cyclic voltammetry, and Rh-Ga was found to be more electron-deficient than Rh-Al (Epc = -2.07 and -1.95 V vs. Fc(+)/Fc for 1-Cl and 2-Cl, respectively). Both 1-Cl and 2-Cl were further functionalized through metathesis reactions using MeLi to generate 1-CH3 and 2-CH3, respectively, or using LiHBEt3 to form 1-H and 2-H, respectively...
February 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28239226/temperature-and-moisture-dependent-studies-on-alunogen-and-the-crystal-structure-of-meta-alunogen-determined-from-laboratory-powder-diffraction-data
#2
Volker Kahlenberg, Doris E Braun, Hannes Krüger, Daniela Schmidmair, Maria Orlova
Starting from a synthetic sample with composition Al2(SO4)3·16.6H2O, the high-temperature- and moisture-dependent behavior of alunogen has been unraveled by TGA measurements, in situ powder X-ray diffraction as well as by gravimetric moisture sorption/desorption studies. Heating experiments using the different techniques show that alunogen undergoes a first dehydration process already starting at temperatures slightly above 40 °C. The crystalline product of the temperature-induced dehydration corresponds to the synthetic equivalent of meta-alunogen and has the following chemical composition: Al2(SO4)3·13...
2017: Physics and Chemistry of Minerals
https://www.readbyqxmd.com/read/28238685/immunization-with-toxoplasma-gondii-aspartic-protease-3-increases-survival-time-of-infected-mice
#3
Guanghui Zhao, Xiaojie Song, Xiangnan Kong, Ning Zhang, Shaoling Qu, Wei Zhu, Yanyan Yang, Qian Wang
Aspartic proteases in the Toxoplasma gondii, called TgASP1, 2, 3, and 5, play essential roles in the life cycle. In a previous study, we have demonstrated that TgASP1 is an antigen that prolongs survival time of infected mice. As an in-depth study, we have investigated the protective immunity of TgSAP3. A bioinformatic analysis was used to predict the linear B-cell epitopes and potential Th-cell epitopes on TgASP3, the results suggested that it has a large number of excellent epitopes. Mice were inoculated with a recombinant eukaryotic expression vector to evaluate the immune protection against an infection with the virulent RH strain of T...
February 23, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28238376/carbon-budget-of-a-rainfed-spring-maize-cropland-with-straw-returning-on-the-loess-plateau-china
#4
Xiang Gao, Fengxue Gu, Weiping Hao, Xurong Mei, Haoru Li, Daozhi Gong, Lili Mao, Zuguang Zhang
Assessing the carbon budget of rainfed agricultural ecosystems is a vital component in the process of estimating the global carbon balance. We used eddy covariance techniques combined with soil respiration measurements to estimate the carbon budget of a rainfed spring maize field where straw returning was practiced, on the Loess Plateau, China, during 2012-2014. Carbon fluxes and their components (except heterotrophic respiration, Rh) exhibited single-peak seasonal patterns, and linear relationships were found between daily gross primary productivity (GPP) and net ecosystem exchange (NEE), and between daily GPP and ecosystem respiration (Re), with goodness of fit value of 0...
February 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28237466/observation-of-nitrous-acid-hono-in-beijing-china-seasonal-variation-nocturnal-formation-and-daytime-budget
#5
Jiaqi Wang, Xiaoshan Zhang, Jia Guo, Zhangwei Wang, Meigen Zhang
Seasonal characteristics of atmospheric nitrous acid (HONO) were investigated with high time-resolution field measurements at an urban site of Beijing in four select months (representing four different seasons) from September 2015 to July 2016. The HONO concentrations displayed a pronounced seasonal profile with a maximum in autumn (2.27±1.82ppb) and a minimum in winter (1.05±0.89ppb). Significant diurnal cycles were also observed during the whole campaign. We found that the nighttime build-up of HONO was attributed to the heterogeneous conversion of NO2 on wet surface...
February 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28236308/prmt5-restricts-hepatitis-b-virus-replication-via-epigenetic-repression-of-cccdna-transcription-and-interference-with-pgrna-encapsidation
#6
Wen Zhang, Jieliang Chen, Min Wu, Xiaonan Zhang, Min Zhang, Lei Yue, Yaming Li, Jiangxia Liu, Baocun Li, Fang Shen, Yang Wang, Lu Bai, Ulrike Protzer, Massimo Levrero, Zhenghong Yuan
: Chronic hepatitis B virus (HBV) infection remains a major health problem worldwide. The covalently closed circular DNA (cccDNA) minichromosome, which serves as the template for the transcription of viral RNAs, plays a key role in viral persistence. While accumulating evidence suggests that cccDNA transcription is regulated by epigenetic machinery, particularly the acetylation of cccDNA-bound histone 3 (H3) and H4, the potential contributions of histone methylation and related host factors remain obscured...
February 25, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28236269/the-development-of-self-nanoemulsifying-liquisolid-tablets-to-improve-the-dissolution-of-simvastatin
#7
Shaimaa Elkadi, Samar Elsamaligy, Saleh Al-Suwayeh, Hanaa Mahmoud
The aim of this work was to develop self-nanoemulsifying liquisolid tablets (SNELT) to enhance the dissolution profile of poorly water-soluble simvastatin. SNELT present a unique technique of incorporating self-nanoemulsifying drug delivery systems (SNEDDS) into tablets. Optimized SNEDDS containing different oils, Cremophor(®) RH 40 (surfactant) and Transcutol(®) HP (co-surfactant), at different ratios, were used as liquid vehicles and loaded on carrier material, microcrystalline cellulose (MCC), and coating material, Cab-o-sil(®) H-5 (nanosize colloidal silicon dioxide) powders at different loading factors (L f ) and fixed excipient ratio (R = 20)...
February 24, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28230379/enantioselective-hydroaminomethylation-of-olefins-enabled-by-rh-br%C3%A3-nsted-acid-relay-catalysis
#8
Jing Meng, Xing-Han Li, Zhi-Yong Han
Herein, by employing a rhodium catalyst with a commercial ligand and a phosphoric acid catalyst, highly chemo-, regio-, and enantioselective hydroaminomethylation of olefins is realized through a relay catalytic hydroformylation/dynamic kinetic reductive amination process. The method features mild conditions (1 bar of syngas, room temperature in most cases), high yields (up to 99%), and high enantioselectivities (up to >99.5:0.5 er). Besides styrenes, acrylamides also provided the products with high yields and enantioselectivities...
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230303/unexpectedly-facile-rh-i-catalyzed-polymerization-of-ethynylbenzaldehyde-type-monomers-synthesis-of-polyacetylenes-bearing-reactive-and-easy-transformable-pendant-carbaldehyde-groups
#9
Jan Sedláček, Lucie Havelková, Jiří Zedník, Radek Coufal, Tomáš Faukner, Hynek Balcar, Jiří Brus
The chain coordination polymerization of (ethynylarene)carbaldehydes with unprotected carbaldehyde groups, namely ethynylbenzaldehydes, 1-ethynylbenzene-3,5-dicarboxaldehyde, and 3-[(4-ethynylphenyl)ethynyl]benzaldehyde, is reported for the first time. Polymerization is catalyzed with various Rh(I) catalysts and yields poly(arylacetylene)s with one or two pendant carbaldehyde groups per monomeric unit. Surprisingly, the carbaldehyde groups of the monomers do not inhibit the polymerization unlike the carbaldehyde group of unsubstituted benzaldehyde that acts as a strong inhibitor of Rh(I) catalyzed polymerization of arylacetylenes...
February 23, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28230260/elevation-of-sharpin-protein-levels-in-prostate-adenocarcinomas-promotes-metastasis-and-impairs-patient-survivals
#10
Hai Huang, Tao Du, Yiming Zhang, Yiming Lai, Kaiwen Li, Xinxing Fan, Dingjun Zhu, Tianxin Lin, Kewei Xu, Jian Huang, Leyuan Liu, Zhenghui Guo
BACKGROUND: SHARPIN, SHANK-associated RH domain interacting protein, associates with a linear ubiquitin chain assembly complex (LUBAC) to regulate inflammation and immunity. It has been reported that SHARPIN is highly expressed in several human tumors including ovarian cancer and liver cancer. We found that SHARPIN is also highly expressed in prostate cancer cell lines of DU145, LNCAP, and PC-3. Suppression of SHARPIN caused an inhibition of NF-κB signal and decreases in tumorigenesis of cultured cells in NOD/SCID mouse model...
February 23, 2017: Prostate
https://www.readbyqxmd.com/read/28229596/rh-catalyzed-asymmetric-hydrogenation-of-%C3%AE-substituted-vinyl-sulfones-an-efficient-approach-to-chiral-sulfones
#11
Liyang Shi, Biao Wei, Xuguang Yin, Peng Xue, Hui Lv, Xumu Zhang
Rh/(S)-(+)-DTBM-Segphos complex catalyzed asymmetric hydrogenation of α-substituted vinyl sulfones has been achieved, furnishing the desired products in high yields and excellent enantioselectivities (>90% yield, up to 99% ee). This method provided an efficient approach to α-substituted chiral sulfones under mild conditions and has potential applications in organic synthesis.
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28227474/automated-abo-rh-d-blood-type-detection-using-smartphone-imaging-for-point-of-care-medical-diagnostics
#12
Neha Srivathsa, Dhananjaya Dendukuri, Neha Srivathsa, Dhananjaya Dendukuri, Neha Srivathsa, Dhananjaya Dendukuri
We present a novel methodology for automated ABO Rh-D blood typing using simple morphological image processing algorithms to be used in conjunction with a fabric strip based rapid diagnostic test. Images of the fabric strip post testing are acquired using low cost mobile phones and the proposed algorithm proceeds to automatically identify the blood type by processing the images using steps comprising of noise reduction, range filtering and empirically derived heuristics. The ultimate goal is to provide a simple mobile phone application to enable automated, rapid and accessible blood type detection at the point-of-care...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226991/noninvasive-health-condition-monitoring-device-for-workers-at-high-altitudes-conditions
#13
Pablo Aqueveque, Cristopher Gutierrez, Francisco Saavedra, Esteban J Pino, Pablo Aqueveque, Cristopher Gutierrez, Francisco Saavedra, Esteban J Pino, Cristopher Gutierrez, Francisco Saavedra, Pablo Aqueveque, Esteban J Pino
This work presents the design and implementation of a continuous monitoring device to control the health state of workers, for instance miners, at high altitudes. The extreme ambient conditions are harmful for peoples' health; therefore a continuous control of the workers' vital signs is necessary. The developed system includes physiological variables: electrocardiogram (ECG), respiratory activity and body temperature (BT), and ambient variables: ambient temperature (AT) and relative humidity (RH). The noninvasive sensors are incorporated in a t-shirt to deliver a functional device, and maximum comfort to the users...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226259/synthesis-optimization-of-oil-palm-empty-fruit-bunch-and-rice-husk-biochars-for-removal-of-imazapic-and-imazapyr-herbicides
#14
Saba Yavari, Amirhossein Malakahmad, Nasiman B Sapari, Sara Yavari
Imidazolinones are a family of herbicides that are used to control a broad range of weeds. Their high persistence and leaching potential make them probable risk to the ecosystems. In this study, biochar, the biomass-derived solid material, was produced from oil palm empty fruit bunches (EFB) and rice husk (RH) through pyrolysis process. Feedstock and pyrolysis variables can control biochar sorption capacity. Therefore, the present study attempts to evaluate effects of three pyrolysis variables (temperature, heating rate and retention time) on abilities of biochars for removal of imazapic and imazapyr herbicides from soil...
February 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28225475/stretching-exercises-improve-vascular-endothelial-dysfunction-through-attenuation-of-oxidative-stress-in-chronic-heart-failure-patients-with-an-implantable-cardioverter-defibrillator
#15
Michitaka Kato, Takashi Masuda, Michio Ogano, Kazuki Hotta, Hisato Takagi, Shinya Tanaka, Yumi Kamada, Ayako Akiyama, Daisuke Kamekawa, Ryosuke Shimizu, Minoru Tabata, Jun Tanabe, Takuya Umemoto
PURPOSE: Endurance training improves oxidative stress and vascular endothelial dysfunction in patients with chronic heart failure (CHF). However, patients with CHF and an implantable cardioverter defibrillator (ICD) or cardiac resynchronization therapy-defibrillator (CRT-D) often avoid endurance training for fear of ICD shock. Recent studies have reported that stretching exercises enhance antioxidant activity and improve vascular responses. Therefore, we aimed to assess the effects of 4 weeks of stretching exercises on oxidative stress and vascular endothelial function in patients with CHF with an ICD or CRT-D...
March 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
https://www.readbyqxmd.com/read/28224393/coamorphous-loratadine-citric-acid-system-with-enhanced-physical-stability-and-bioavailability
#16
Jin Wang, Ruimiao Chang, Yanan Zhao, Jiye Zhang, Ting Zhang, Qiang Fu, Chun Chang, Aiguo Zeng
Coamorphous systems using citric acid as a small molecular excipient were studied for improving physical stability and bioavailability of loratadine, a BCS class II drug with low water solubility and high permeability. Coamorphous loratadine-citric acid systems were prepared by solvent evaporation technique and characterized by differential scanning calorimetry, X-ray powder diffraction, and Fourier transform infrared spectroscopy. Solid-state analysis proofed that coamorphous loratadine-citric acid system (1:1) was amorphous and homogeneous, had a higher T g over amorphous loratadine, and the intermolecular hydrogen bond interactions between loratadine and citric acid exist...
February 21, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28224146/cooperativity-of-axial-and-centre-chirality-in-the-biaryl-disulfoxide-rh-i-catalysed-asymmetric-1-4-addition-of-arylboronic-aids-to-2-cyclohexenone-a-dft-study
#17
Gao-Feng Zha, Hua-Li Qin, Eric Assen B Kantchev
Atropisomeric biaryl disulfoxides contain two independent chiral elements. Previously, the (M,S,S)-diastereomer showed very high catalytic activity and selectivity in the Rh-catalyzed asymmetric 1,4-addition of arylboronic acids to α,β-enones whereas the (M,R,R) counterpart - none. Herein, DFT computations on the key transmetallation (turnover-determining) and carborhodation (enantioselectivity-determining) steps of the catalytic cycle show that the (M,S,S)-ligand gives rise to lower reaction barriers for these elementary steps...
February 22, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28222978/toxicity-of-platinum-palladium-and-rhodium-to-daphnia-magna-in-single-and-binary-metal-exposure-experiments
#18
Sonja Zimmermann, Carolina Wolff, Bernd Sures
Mainly due to automobile traffic, but also due to other sources, the platinum group elements (PGE) platinum (Pt), palladium (Pd) and rhodium (Rh) are introduced into aquatic biotopes where they accumulate in sediments of lakes and rivers. However, the toxicity of these noble metals to aquatic organisms is not well understood and especially toxicity studies under standardized condition are lacking. Thus, the toxicity of Pt, Pd and Rh to Daphnia magna was tested in single metal exposure experiments according to OECD guideline 202...
February 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28222922/biomass-production-and-carbon-sequestration-of-a-short-rotation-forest-with-different-poplar-clones-in-northwest-china
#19
Yan Meifang, Wang Lu, Ren Honghui, Zhang Xinshi
Short Rotation Forestry (SRF) is of interest as producers of biomass for bio-energy, but also as carbon (C) sinks to mitigate CO2 emission. To investigate biomass production and C sequestration of SRF, ecosystem C stock (including C stored in tree biomass, litter and soil), NPP (net primary productivity), heterotrophic respiration (Rh) and NEP (net ecosystem productivity) of three poplar clone plantations were estimated by repeated field sampling in northwest China. Ecosystem C stock (105.62MgCha(-1)) was significantly lower in PB (P...
February 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28222370/increased-postural-sway-in-persons-with-multiple-sclerosis-during-short-term-exposure-to-warm-ambient-temperatures
#20
Paula Y S Poh, Amy N Adams, Mu Huang, Dustin R Allen, Scott L Davis, Anna S Tseng, Craig G Crandall
BACKGROUND: Multiple sclerosis (MS) is a neurological disease marked by demyelination and axonal loss. Individuals with MS experience increases in clinical signs and symptoms during heat exposure. OBJECTIVE: To test the hypothesis that moderate heat exposure adversely affects postural sway in individuals with MS. METHODS: Ten individuals with relapsing-remitting MS (50±8y) and nine controls (47±10y) were examined under a Thermal and a Time Control trial...
February 8, 2017: Gait & Posture
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