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https://www.readbyqxmd.com/read/28813058/fine-tuning-of-catalytic-and-sorption-properties-of-metal-organic-frameworks-via-in-situ-ligand-exchange
#1
Peng Wang, Kai Chen, Qing Liu, Huai-Wei Wang, Mohammad Azam, Saud I Al-Resayes, Yi Lu, Wei-Yin Sun
Metal-organic frameworks (MOFs) are gaining considerable attention not only because of their diverse structures but also due to their interesting properties and potential applications. However, fabrication of MOFs with desired structures and properties remains a great challenge. In this study, a strategy based on ligand exchange via single-crystal-to-single-crystal (SCSC) transformation has been undertaken, which can be used to achieve MOFs not available by direct synthesis and also to enrich the family of isoreticular MOFs...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28813041/supported-nickel-rhenium-catalysts-for-selective-hydrogenation-of-methyl-esters-to-alcohols
#2
Kaituo Liu, James Pritchard, Li Lu, Robbert van Putten, M W G M Tiny Verhoeven, Mike Schmitkamp, Xiaoming Huang, Laurent Lefort, Christopher J Kiely, Emiel J M Hensen, Evgeny A Pidko
The addition of Re to Ni on TiO2 yields efficient catalysts for the hydrogenation of acids and esters to alcohols under mild conditions. Rhenium promotes the formation of atomically dispersed and sub-nanometre-sized bimetallic species interacting strongly with the oxide support.
August 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28812894/enhanced-production-of-%C3%AE%C2%BA-carrageenase-and-%C3%AE%C2%BA-carrageenan-oligosaccharides-through-immobilization-of-thalassospira-sp-fjfst-332-with-magnetic-fe3o4-chitosan-microspheres
#3
Juanjuan Guo, Zhichang Zheng, Chi Chen, Xu Lu, Yi Zhang, Baodong Zheng
In this study, immobilized bacteria (IMB) microsphere was prepared by embedding κ-carrageenase-producing Thalassospira sp.Fjfst-332 (TF332) onto a magnetic Fe3O4-chitosan carrier. The performance of Fe3O4-chitosan carrier was optimized by comparing their bacteria immobilization capacity at different Fe3O4:chitosan ratios and temperatures, while the functions of IMB microspheres were characterized by examining their κ-carrageenase production at different temperatures, pH, and reuse cycles. At the 1:1 (w:w) Fe3O4:chitosan ratio, the Fe3O4-chitosan carriers possessed sufficient anchoring capacity for bacterial immobilization without significant compromise of their magnetism for magnetic separation of IMB from culture media...
August 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28812888/triply-bonded-gallium%C3%A2-phosphorus-molecules-theoretical-designs-and-characterization
#4
Jia-Syun Lu, Ming-Chung Yang, Ming-Der Su
The effect of substitution on the potential energy surfaces of triple-bonded RGa≡PR (R = F, OH, H, CH3, SiH3, SiMe(SitBu3)2, SiiPrDis2, Tbt (C6H2-2,4,6-{CH(SiMe3)2}3), and Ar* (C6H3-2,6-(C6H2-2,4,6-i-Pr3)2)) compounds was theoretically examined by using the density functional theory (i.e., M06-2X/Def2-TZVP, B3PW91/Def2-TZVP and B3LYP/LANL2DZ+dp). The theoretical evidences strongly suggest all of the triple-bonded RGa≡PR species prefer to select a bent form with an angle (∠Ga-P-R) of about 90°. Moreover, the theoretical observations indicate only the bulkier substituents, in particular for the strong donating groups (e...
August 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28812773/side-by-side-observation-of-the-interfacial-improvement-of-vertical-graphene-coated-silicon-nanocone-anodes-for-lithium-ion-batteries-by-patterning-technology
#5
Chao Wang, Fei Luo, Hao Lu, Bonan Liu, Geng Chu, Baogang Quan, Junjie Li, Changzhi Gu, Hong Li, Liquan Chen
We report that vertical graphene coating can greatly improve the electrochemical performance and the interfacial stability of silicon nanocone (SNC) anodes for lithium-ion batteries. The coating patterning technology is innovatively employed for side-by-side demonstration of the exclusive influences of graphene coating on the solid-electrolyte interphase (SEI) formation and the structural stability of the SNC electrode. The silicon nanocone-graphene (SNC-G) electrode achieves a longer cycle life (1715 cycles), higher Coulombic efficiency (average 98...
August 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28812762/a-facile-synthesis-of-cufe2o4-cu9s8-ppy-ternary-nanotubes-as-peroxidase-mimics-for-the-sensitive-colorimetric-detection-of-h2o2-and-dopamine
#6
Zezhou Yang, Fuqiu Ma, Yun Zhu, Sihui Chen, Ce Wang, Xiaofeng Lu
Synergistic effects play an important role in improving the catalytic activity for enzyme-like reactions. Compared to individual nanomaterials, a system consisting of multiple components usually exhibits enhanced catalytic activity as an enzyme mimic. Herein we describe the synthesis of CuFe2O4/Cu9S8/polypyrrole (PPy) ternary nanotubes as an efficient peroxidase mimic via a three-step approach involving an electrospinning process, annealing treatment and hydrothermal reaction. The remarkably enhanced catalytic activity of CuFe2O4/Cu9S8/PPy ternary nanotubes as peroxidase mimics over individual CuFe2O4 nanofibers, CuFe2O4/CuO composite nanofibers, CuFe2O4/CuS composite nanofibers, and PPy materials has been achieved, demonstrating the presence of a synergistic effect among the components...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812748/cyclometalated-iridium-iii-n-heterocyclic-carbene-complexes-as-potential-mitochondrial-anticancer-and-photodynamic-agents
#7
Yi Li, Bing Liu, Xin-Ran Lu, Meng-Feng Li, Liang-Nian Ji, Zong-Wan Mao
Metal N-heterocyclic carbene (NHC) complexes represent a promising class of anticancer therapeutic agents. In this work, four cyclometalated iridium(iii) complexes (Ir1-Ir4) containing N-heterocyclic carbene ligands have been explored as mitochondrial anticancer and photodynamic agents. These complexes are more cytotoxic than cisplatin against the cancer cells screened, can quickly penetrate into A549 cells and are mainly localized in the mitochondria. Mechanism studies show that these complexes exert their anticancer efficacy by increasing the intracellular ROS level, reducing the mitochondrial membrane potential (MMP) and inducing apoptosis...
August 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28812685/scallop-genome-provides-insights-into-evolution-of-bilaterian-karyotype-and-development
#8
Shi Wang, Jinbo Zhang, Wenqian Jiao, Ji Li, Xiaogang Xun, Yan Sun, Ximing Guo, Pin Huan, Bo Dong, Lingling Zhang, Xiaoli Hu, Xiaoqing Sun, Jing Wang, Chengtian Zhao, Yangfan Wang, Dawei Wang, Xiaoting Huang, Ruijia Wang, Jia Lv, Yuli Li, Zhifeng Zhang, Baozhong Liu, Wei Lu, Yuanyuan Hui, Jun Liang, Zunchun Zhou, Rui Hou, Xue Li, Yunchao Liu, Hengde Li, Xianhui Ning, Yu Lin, Liang Zhao, Qiang Xing, Jinzhuang Dou, Yangping Li, Junxia Mao, Haobing Guo, Huaiqian Dou, Tianqi Li, Chuang Mu, Wenkai Jiang, Qiang Fu, Xiaoteng Fu, Yan Miao, Jian Liu, Qian Yu, Ruojiao Li, Huan Liao, Xuan Li, Yifan Kong, Zhi Jiang, Daniel Chourrout, Ruiqiang Li, Zhenmin Bao
Reconstructing the genomes of bilaterian ancestors is central to our understanding of animal evolution, where knowledge from ancient and/or slow-evolving bilaterian lineages is critical. Here we report a high-quality, chromosome-anchored reference genome for the scallop Patinopecten yessoensis, a bivalve mollusc that has a slow-evolving genome with many ancestral features. Chromosome-based macrosynteny analysis reveals a striking correspondence between the 19 scallop chromosomes and the 17 presumed ancestral bilaterian linkage groups at a level of conservation previously unseen, suggesting that the scallop may have a karyotype close to that of the bilaterian ancestor...
April 3, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812352/ca-%C3%AE-sialon-eu-phosphors-oxidation-states-energy-transfer-and-emission-enhancement-by-incorporation-aimed-surface-engineering
#9
Xiangyang Chen, Lin Gan, Zhi-Jun Zhang, Ping Lu, Xionghui Zeng, Linlin Zhang, Heliang Yao, FangFang Xu, Jing-Tai Zhao
Ca-α-SiAlON: Eu is one of the most promising phosphors exhibiting potential applications in high power LEDs owing to its excellent thermal stability and relative high luminescence efficiency comparable to YAG: Ce commercial phosphors. The oxidation states of Eu ions in Ca-α-SiAlON: Eu are still questionable and furthermore it yet exhibits lower luminescence intensity than commercial yellow phosphors. Therefore, in the present work, the valances of Eu ions in Ca-α-SiAlON have been examined which observed a mixture of divalence and trivalence...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812299/conversion-of-the-high-yield-salinomycin-producer-streptomyces-albus-bk3-25-into-a-surrogate-host-for-polyketide-production
#10
Xiaojie Zhang, Chenyang Lu, Linquan Bai
An ideal surrogate host for heterologous production of various natural products is expected to have efficient nutrient utilization, fast growth, abundant precursors and energy supply, and a pronounced gene expression. Streptomyces albus BK3-25 is a high-yield industrial strain producing type-I polyketide salinomycin, with a unique ability of bean oil utilization. Its potential of being a surrogate host for heterologous production of PKS was engineered and evaluated herein. Firstly, introduction of a three-gene cassette for the biosynthesis of ethylmalonyl-CoA resulted in accumulation of ethylmalonyl-CoA precursor and salinomycin, and subsequent deletion of the salinomycin biosynthetic gene cluster resulted in a host with rich supplies of common polyketide precursors, including malonyl-CoA, methylmalonyl-CoA, and ethylmalonyl-CoA...
August 14, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28812297/neomycin-biosynthesis-is-regulated-positively-by-afsa-g-and-neor-in-streptomyces-fradiae-cgmcc-4-7387
#11
Xiangxi Meng, Wenzhao Wang, Zhoujie Xie, Pengwei Li, Yue Li, Zhengyan Guo, Yingjian Lu, Jie Yang, Kaile Guan, Zhaoxin Lu, Huarong Tan, Yihua Chen
Neomycins are a group of aminoglycoside antibiotics with both clinical and agricultural applications. To elucidate the regulatory mechanism of neomycin biosynthesis, we completed draft genome sequencing of a neomycin producer Streptomyces fradiae CGMCC 4.7387 from marine sediments, and the neomycin biosynthesis gene cluster was identified. Inactivation of the afsA-g gene encoding a γ-butyrolactone (GBL) synthase in S. fradiae CGMCC 4.7387 resulted in a significant decrease of neomycin production. Quantitative RT-PCR analysis revealed that the transcriptional level of neoR and the aphA-neoGH operon were reduced in the afsA-g::aac(3)IV mutant...
August 14, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28812125/recombinant-expression-and-biochemical-characterization-of-mycobacterium-tuberculosis-3fe-4s-ferredoxin-rv1786
#12
Yun Lu, Feng Qiao, Yue Li, Xiao-Hong Sang, Cong-Ran Li, Jian-Dong Jiang, Xin-Yi Yang, Xue-Fu You
Ferredoxins are iron-sulfur protein that mediate electron transfer in cytochrome P450 mono-oxygenase (CYP)-related catalytic reactions in a wide variety of organisms. Rv1786 is a putative ferredoxin, encoded by a gene located downstream of the gene encoding CYP143A1 in the Mycobacterium tuberculosis genome. However, the structure and function of Rv1786 have remained unclear. Here, the recombinant Mtb Rv1786 was expressed, purified as a His-tagged form and characterized with [3Fe-4S] clusters as its cofactors using a series of measurements including SDS-PAGE, western blot, UV/Visible, MALDI-TOF/TOF-MS, and electron paramagnetic resonance spectroscopic analysis...
August 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28811993/posterolateral-fusion-versus-interbody-fusion-for-degenerative-spondylolisthesis-systematic-review-and-meta-analysis
#13
REVIEW
Ryan C Campbell, Ralph J Mobbs, Victor M Lu, Joshua Xu, Prashanth J Rao, Kevin Phan
STUDY DESIGN: Systematic review and meta-analysis. OBJECTIVE: Current surgical management of degenerative spondylolisthesis (DS) involves decompression of the spinal canal followed by fusion with or without interbody. The additional functional and operative benefits derived from interbody inclusion has yet to be thoroughly established with a number of recent studies producing conflicting results. Thus, we aim to compare the functional and operative outcomes after fusion against interbody fusion in the treatment of DS...
August 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28811902/a-case-control-study-of-the-association-between-psychosocial-factors-and-the-occurrence-of-laryngeal-cancer
#14
Chao Wang, Guoliang Fan, Rui Xu, Jingting Wang, Lina Wang, Lu Zhang, Qiuying Li
The aim of the present study was to investigate the association between social psychological factors and the occurrence of laryngeal cancer. A 1:1 matched case-control study was conducted. The participants completed questionnaires that included general information, such as the Life Event Scale, the Social Support Rating Scale, and the Eysenck Personality Questionnaire (EPQ). Scores were compared between the groups using paired t-tests and Wilcoxon's signed-rank tests. No significant difference in the psychoticism scale of the EPQ was observed between the two groups (P>0...
September 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28811829/metabolomics-analysis-for-defining-serum-biochemical-markers-in-colorectal-cancer-patients-with-qi-deficiency-syndrome-or-yin-deficiency-syndrome
#15
Fangfang Tao, Ping Lü, Chunbo Xu, Mengmeng Zheng, Wenhong Liu, Minhe Shen, Shanming Ruan
Colorectal cancer is one of the leading causes of tumor-associated death, and traditional Chinese medicine (TCM) classifies colorectal cancer into various subtypes mainly according to the symptomatic pattern identification (ZHENG). Here, we investigated the difference in metabolic profiles of serum by comparing colorectal cancer subjects with Nondeficiency (ND), Qi deficiency (QD), and Yin deficiency (YD). The ratio of subjects with carcinoembryonic antigen (CEA) was higher in YD pattern, and the ratio of subjects with carbohydrate antigen 19-9 (CA19-9) was higher both in YD and in QD, compared with ND...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28811808/prevention-of-anesthesia-induced-injection-pain-of-propofol-in-pediatric-anesthesia
#16
Dabin Cheng, Lu Liu, Zheng Hu
OBJECTIVE: Propofol is a new anesthetic agent in clinical practice, but randomized double-blinded prospective studies on its role in pediatric anesthesia remain limited. We aimed to compare the preventive effects of pre-injected lidocaine or ketamine and its pre-mixture on the anesthesia-induced injection pain of propofol using a randomized double-blinded prospective method, and to compare the outcomes with those of medium-/long-chain propofol (M/LCT). METHODS: A total of 360 pediatric patients (aged 5-12 years old) who received elective surgery were randomly divided into six groups (n= 60) as follows...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28811661/myst2-kat7-histone-acetyltransferase-interaction-proteomics-reveals-tumour-suppressor-niam-as-a-novel-binding-partner-in-embryonic-stem-cells
#17
Mercedes Pardo, Lu Yu, Shihpei Shen, Peri Tate, Daniel Bode, Blake L Letney, Dawn E Quelle, William Skarnes, Jyoti S Choudhary
MYST histone acetyltransferases have crucial functions in transcription, replication and DNA repair and are hence implicated in development and cancer. Here we characterise Myst2/Kat7/Hbo1 protein interactions in mouse embryonic stem cells by affinity purification coupled to mass spectrometry. This study confirms that in embryonic stem cells Myst2 is part of H3 and H4 histone acetylation complexes similar to those described in somatic cells. We identify a novel Myst2-associated protein, the tumour suppressor protein Niam (Nuclear Interactor of ARF and Mdm2)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811620/a-new-anthracycline-type-metabolite-from-streptomyces-sp-neau-l3
#18
Chang Lu, Yue Zhao, Wei-Qi Jia, Hui Zhang, Huan Qi, Wen-Sheng Xiang, Ji-Dong Wang, Xiang-Jing Wang
A new anthracycline-type metabolite, designated as tetracenoquinocin A (1), was isolated from the fermentation broth of Streptomyces sp. NEAU-L3. Its structure was determined on the basis of spectroscopic analysis, including 1D and 2D NMR techniques as well as ESI-MS and comparison with data from the literature. Compound 1 showed potent cytotoxic activity against three cancer cell lines (HepG2, A549, HCT-116) with IC50 values of 5.57, 24.30 and 20.82 μM, respectively.The Journal of Antibiotics advance online publication, 16 August 2017; doi:10...
August 16, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28811619/comparative-mitogenomic-analysis-of-aposthonia-borneensis-and-aposthonia-japonica-embioptera-oligotomidae-reveals-divergent-evolution-of-webspinners
#19
Zhi-Teng Chen, Liang Lü, Ming-Xing Lu, Yu-Zhou Du
In this study, we report the complete mitochondrial genome (mitogenome, mtDNA) of Aposthonia borneensis and compare it with another sequenced webspinner, Aposthonia japonica. The A. borneensis mitogenome is smaller than A. japonica, but the size of each gene and the A + T content of protein-coding genes (PCGs) are almost identical in the two mitogenomes. Among the PCGs, atp6 shows the highest evolutionary rate and cox1 the lowest. The mtDNA map in A. borneensis is similar to Drosophila yakuba, but distinctly different from A...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811616/synthesis-free-pet-imaging-of-brown-adipose-tissue-and-tspo-via-combination-of-disulfiram-and-64-cucl2
#20
Jing Yang, Jian Yang, Lu Wang, Anna Moore, Steven H Liang, Chongzhao Ran
PET imaging is a widely applicable but a very expensive technology. On-site synthesis is one important contributor to the high cost. In this report, we demonstrated the feasibility of a synthesis-free method for PET imaging of brown adipose tissue (BAT) and translocator protein 18 kDa (TSPO) via a combination of disulfiram, an FDA approved drug for alcoholism, and (64)CuCl2 (termed (64)Cu-Dis). In this method, a step-wise injection protocol of (64)CuCl2 and disulfiram was used to accomplish the purpose of synthesis-free...
August 15, 2017: Scientific Reports
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