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https://www.readbyqxmd.com/read/28343105/photoluminescence-light-up-detection-of-zinc-ion-and-imaging-in-living-cells-based-on-the-aggregation-induced-emission-enhancement-of-glutathione-capped-copper-nanoclusters
#1
Liyun Lin, Yuefang Hu, Liangliang Zhang, Yong Huang, Shulin Zhao
In this work, we prepared glutathione (GSH)-capped copper nanoclusters (Cu NCs) with red emission by simply adjusting the pH of GSH/Cu(2+) mixture at room temperature. A photoluminescence light-up method for detecting Zn(2+) was then developed based on the aggregation induced emission enhancement of GSH-capped Cu NCs. Zn(2+) could trigger the aggregation of Cu NCs, inducing the enhancement of luminescence and the increase of absolute quantum yield from 1.3% to 6.2%. GSH-capped Cu NCs and the formed aggregates were characterized, and the possible mechanism was also discussed...
March 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28342716/immediate-postpartum-intrauterine-device-and-implant-program-outcomes-a-prospective-analysis
#2
Jennifer L Eggebroten, Jessica N Sanders, David K Turok
BACKGROUND: In-hospital placement of intrauterine devices (IUD) and contraceptive implants following vaginal and cesarean delivery is increasingly popular and responds to maternal motivation for highly effective postpartum contraception. Immediate postpartum IUD insertion is associated with higher expulsion than interval placement, but emerging evidence suggests that the LNG IUD may have a higher expulsion rate than the Cu IUD. OBJECTIVE: This study evaluated in-hospital provision, expulsion and six month continuation of immediate postpartum copper T380 IUDs (Cu IUD), levonorgestrel (LNG) IUDs, and contraceptive implants...
March 22, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28342400/using-gene-expression-database-to-uncover-biology-functions-of-1-4-disubstituted-1-2-3-triazole-analogues-synthesized-via-a-copper-i-catalyzed-reaction
#3
Chun-Li Su, Chia-Ling Tseng, Chintakunta Ramesh, Hsiao-Sheng Liu, Chi-Ying F Huang, Ching-Fa Yao
We have synthesized bioactive 1,4-disubstituted 1,2,3-triazole analogues containing 2H-1,4-benzoxazin-3-(4H)-one derivatives via 1,3-dipolar cycloaddition in the presence of CuI. All the reactions proceeded smoothly and afforded its desired products in excellent yields. Among these analogues, 3y exhibited a better cytotoxic effect on human hepatocellular carcinoma (HCC) Hep 3B cells and displayed less cytotoxicity on normal human umbilical vein endothelial cells, compared with Sorafenib, a targeted therapy for advanced HCC...
March 18, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28340465/dumbbell-dna-templated-cunps-as-a-nano-fluorescent-probe-for-detection-of-enzymes-involved-in-ligase-mediated-dna-repair
#4
Taiping Qing, Xiaoxiao He, Dinggeng He, Xiaosheng Ye, Jingfang Shangguan, Jinquan Liu, Baoyin Yuan, Kemin Wang
DNA repair processes are responsible for maintaining genome stability. Ligase and polynucleotide kinase (PNK) have important roles in ligase-mediated DNA repair. The development of analytical methods to monitor these enzymes involved in DNA repair pathways is of great interest in biochemistry and biotechnology. In this work, we reported a new strategy for label-free monitoring PNK and ligase activity by using dumbbell-shaped DNA templated copper nanoparticles (CuNPs). In the presence of PNK and ligase, the dumbbell-shaped DNA probe (DP) was locked and could resist the digestion of exonucleases and then served as an efficient template for synthesizing fluorescent CuNPs...
March 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28340386/constructed-ils-coated-porous-magnetic-nickel-cobaltate-hexagonal-nanoplates-sensing-materials-for-the-simultaneous-detection-of-cumulative-toxic-metals
#5
Yuanyuan Dong, Lei Zhang
The different morphologies of magnetic nickel cobaltate (NiCo2O4) electrocatalysts, consisting of nanoparticles (NiCo2O4-N), nanoplates (NiCo2O4-P) and microspheres (NiCo2O4-S) were fabricated. It was found that the electrocatalytic properties of the sensing materials were strongly dependent on morphology and specific surface area. The porous NiCo2O4 hexagonal nanoplates coupled with ILs as modified materials (ILs@NiCo2O4-P) for the simultaneous determination of thallium (Tl(+)), lead (Pb(2+)) and copper (Cu(2+)), exhibited high sensitivity, long-time stability and good repeatability...
March 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340273/genetic-diversity-and-selection-of-common-bean-lines-based-on-technological-quality-and-biofortification
#6
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/28339192/a-novel-exposure-system-termed-navetta-for-in-vitro-laminar-flow-electrodeposition-of-nanoaerosol-and-evaluation-of-immune-effects-in-human-lung-reporter-cells
#7
Evelien Frijns, Sandra Verstraelen, Linda Corinna Stoehr, Jo van Laer, An Jacobs, Jan Peters, Kristof Tirez, Matthew Boyles, Mark Geppert, Pierre Madl, Inge Nelissen, Albert Duschl, Martin Himly
A new prototype air-liquid interface (ALI) exposure system, a flatbed aerosol exposure chamber termed NAVETTA, was developed to investigate deposition of engineered nanoparticles (NPs) on cultured human lung A549 cells directly from the gas phase. This device mimics human lung cell exposure to NPs due to a low horizontal gas flow combined with cells exposed at the ALI. Electrostatic field assistance is applied to improve NP deposition efficiency. As proof-of-principle, cell viability and immune responses after short-term exposure to nano-copper oxide (CuO)-aerosol were determined...
March 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28338329/evidence-for-electron-hole-pair-excitation-in-the-associative-desorption-of-h2-and-d2-from-au-111
#8
Quan Shuai, Sven Kaufmann, Daniel J Auerbach, Dirk Schwarzer, Alec M Wodtke
The dissociative adsorption reaction of hydrogen on noble metals is believed to be well described within the Born-Oppenheimer approximation. In this work, we have experimentally derived translational energy distributions for selected quantum states of H2 and D2 formed in associative desorption reactions at a Au(111) surface. Using the principle of detailed balance, we compare our results to theory carried out at the same level of sophistication as was done for the reaction on copper. The theory predicts much higher translational excitation than is seen in experiment and fails to reproduce the experimentally observed isotope effect...
March 24, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28338061/heteroleptic-copper-i-complexes-of-scorpionate-bis-pyrazolyl-carboxylate-ligand-with-auxiliary-phosphine-as-potential-anticancer-agents-an-insight-into-cytotoxic-mode
#9
Rais Ahmad Khan, Mohammad Usman, Rajakumar Dhivya, Perumalsamy Balaji, Ali Alsalme, Hamad AlLohedan, Farukh Arjmand, Khalid AlFarhan, Mohammad Abdulkader Akbarsha, Fabio Marchetti, Claudio Pettinari, Sartaj Tabassum
New copper(I) complexes [CuCl(PPh3)(L)] (1: L = LA = 4-carboxyphenyl)bis(3,5-dimethylpyrazolyl)methane; (2: L = LB = 3-carboxyphenyl)bis(3,5-dimethylpyrazolyl)methane) were prepared and characterised by elemental analysis and various spectroscopic techniques such as FT-IR, NMR, UV-Vis, and ESI-MS. The molecular structures of complexes 1 and 2 were analyzed by theoretical B3LYP/DFT method. Furthermore, in vitro DNA binding studies were carried out to check the ability of complexes 1 and 2 to interact with native calf thymus DNA (CT-DNA) using absorption titration, fluorescence quenching and circular dichroism, which is indicative of more avid binding of the complex 1...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338044/effect-of-decomposition-and-organic-residues-on-resistivity-of-copper-films-fabricated-via-low-temperature-sintering-of-complex-particle-mixed-dispersions
#10
Yingqiong Yong, Mai Thanh Nguyen, Hiroki Tsukamoto, Masaki Matsubara, Ying-Chih Liao, Tetsu Yonezawa
Mixtures of a copper complex and copper fine particles as copper-based metal-organic decomposition (MOD) dispersions have been demonstrated to be effective for low-temperature sintering of conductive copper film. However, the copper particle size effect on decomposition process of the dispersion during heating and the effect of organic residues on the resistivity have not been studied. In this study, the decomposition process of dispersions containing mixtures of a copper complex and copper particles with various sizes was studied...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28338001/renin-angiotensin-system-acting-on-reactive-oxygen-species-in-paraventricular-nucleus-induces-sympathetic-activation-via-at1r-pkc%C3%AE-rac1-pathway-in-salt-induced-hypertension
#11
Qing Su, Chan-Juan Huo, Hong-Bao Li, Kai-Li Liu, Xiang Li, Qing Yang, Xin-Ai Song, Wen-Sheng Chen, Wei Cui, Guo-Qing Zhu, Xiao-Lian Shi, Jin-Jun Liu, Yu-Ming Kang
Brain renin-angiotensin system (RAS) could regulate oxidative stress in the paraventricular nucleus (PVN) in the development of hypertension. This study was designed to explore the precise mechanisms of RAS acting on reactive oxygen species (ROS) in salt-induced hypertension. Male Wistar rats were administered with a high-salt diet (HS, 8.0% NaCl) for 8 weeks to induced hypertension. Those rats were received PVN infusion of AT1R antagonist losartan (LOS, 10 μg/h) or microinjection of small interfering RNAs for protein kinase C γ (PKCγ siRNA) once a day for 2 weeks...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28337961/biosorption-of-heavy-metals-from-aqueous-solution-by-bacteria-isolated-from-contaminated-soil
#12
Pradeep Dhanwal Anil Kumar Shruti Dudeja Hemlata Badgujar Rohit Chauhan Abhishek Kumar Poonam Dhull Vinod Chhokar Vikas Beniwal
The study was carried out to analyze the heavy metals biosorption potential of bacteria isolated from electroplating industrial effluents contaminated soil. Bacterial isolates were screened for their multi-metal biosorption potential against copper, nickel, lead and chromium. Bacterial isolate CU4A showed maximum uptake of copper, nickel, lead and chromium in aqueous solution with biosorption efficiency as 87.16 %, 79.62%, 84.92% and 68.12%, respectively. The bacterial strain CU4A was identified as Bacillus cereus following 16S rRNA gene sequence analysis...
March 9, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28337748/interaction-of-copper-nanoparticles-and-an-endophytic-growth-promoter-piriformospora-indica-with-cajanus-cajan
#13
Jyoti Rajak, Manisha Bawskar, Dnyaneshwar Rathod, Gauravi Agarkar, Dipali Nagaonkar, Aniket Gade, Mahendra Rai
BACKGROUND: In recent years, the agro-bionanotechnology has paved the way towards revolutionizing the current practices of food and agricultural fields. In the present study, the effect of copper nanoparticles alone and in combination with growth promoting fungus Piriformospora indica on two-week old seedlings of Cajanus cajan was evaluated. Gelatin coated stable copper nanoparticles were synthesized by chemical reduction method using hydrazine hydrate as a reducing agent. RESULTS: Copper nanoparticles were characterized by using UV-Visible spectroscopy, zeta potential measurement and transmission electron microscopy...
March 23, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28336966/an-integrated-h-g-scheme-identifying-areas-for-soil-remediation-and-primary-heavy-metal-contributors-a-risk-perspective
#14
Bin Zou, Xiaolu Jiang, Xiaoli Duan, Xiuge Zhao, Jing Zhang, Jingwen Tang, Guoqing Sun
Traditional sampling for soil pollution evaluation is cost intensive and has limited representativeness. Therefore, developing methods that can accurately and rapidly identify at-risk areas and the contributing pollutants is imperative for soil remediation. In this study, we propose an innovative integrated H-G scheme combining human health risk assessment and geographical detector methods that was based on geographical information system technology and validated its feasibility in a renewable resource industrial park in mainland China...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28336865/synthesis-optical-and-structural-properties-of-copper-sulfide-nanocrystals-from-single-molecule-precursors
#15
Peter A Ajibade, Nandipha L Botha
We report the synthesis and structural studies of copper sulfide nanocrystals from copper (II) dithiocarbamate single molecule precursors. The precursors were thermolysed in hexadecylamine (HDA) to prepare HDA-capped CuS nanocrystals. The optical properties of the nanocrystals studied using UV-visible and photoluminescence spectroscopy showed absorption band edges at 287 nm that are blue shifted, and the photoluminescence spectra show emission curves that are red-shifted with respect to the absorption band edges...
February 4, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336840/spectroscopic-characterization-of-copper-chitosan-nanoantimicrobials-prepared-by-laser-ablation-synthesis-in-aqueous-solutions
#16
Maria Chiara Sportelli, Annalisa Volpe, Rosaria Anna Picca, Adriana Trapani, Claudio Palazzo, Antonio Ancona, Pietro Mario Lugarà, Giuseppe Trapani, Nicola Cioffi
Copper-chitosan (Cu-CS) nanoantimicrobials are a novel class of bioactive agents, providing enhanced and synergistic efficiency in the prevention of biocontamination in several application fields, from food packaging to biomedical. Femtosecond laser pulses were here exploited to disrupt a Cu solid target immersed into aqueous acidic solutions containing different CS concentrations. After preparation, Cu-CS colloids were obtained by tuning both Cu/CS molar ratios and laser operating conditions. As prepared Cu-CS colloids were characterized by Fourier transform infrared spectroscopy (FTIR), to study copper complexation with the biopolymer...
December 30, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28336665/active-sites-for-co2-hydrogenation-to-methanol-on-cu-zno-catalysts
#17
Shyam Kattel, Pedro J Ramírez, Jingguang G Chen, José A Rodriguez, Ping Liu
The active sites over commercial copper/zinc oxide/aluminum oxide (Cu/ZnO/Al2O3) catalysts for carbon dioxide (CO2) hydrogenation to methanol, the Zn-Cu bimetallic sites or ZnO-Cu interfacial sites, have recently been the subject of intense debate. We report a direct comparison between the activity of ZnCu and ZnO/Cu model catalysts for methanol synthesis. By combining x-ray photoemission spectroscopy, density functional theory, and kinetic Monte Carlo simulations, we can identify and characterize the reactivity of each catalyst...
March 24, 2017: Science
https://www.readbyqxmd.com/read/28336584/complete-genome-sequences-of-six-copper-resistant-xanthomonas-citri-pv-%C3%A2-citri-strains-causing-asiatic-citrus-canker-obtained-using-long-read-technology
#18
Damien Richard, Claudine Boyer, Christian Vernière, Blanca I Canteros, Pierre Lefeuvre, Olivier Pruvost
The gammaproteobacterium Xanthomonas citri pv. citri causes Asiatic citrus canker. Pathotype A strains have a broad host range, which includes most commercial citrus species, and they cause important economic losses worldwide. Control often relies on frequent copper sprays. We present here the complete genomes of six X. citri pv. citri copper-resistant strains.
March 23, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28336092/physiological-and-biochemical-responses-of-salix-integra-thunb-under-copper-stress-as-affected-by-soil-flooding
#19
Yini Cao, Chuanxin Ma, Guangcai Chen, Jianfeng Zhang, Baoshan Xing
To explore the joint effect of copper (Cu) and flooding on Salix integra Thunb. (S. integra), the physiological and biochemical parameters of the seedlings grown in Cu amended soil (50, 150, 450 mg kg(-1)) with or without the flooding for 60 days were evaluated. The results suggested that the flooding significantly inhibited the root growth in terms of root length and root tips. The Cu exposures of 50 and 150 mg kg(-1) notably enhanced the root growth as compared to the control. Majority of Cu was accumulated in S...
March 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28335980/paper-polymer-composite-devices-with-minimal-fluorescence-background
#20
Chang-Ming Wang, Chong-You Chen, Wei-Ssu Liao
Polymer film incorporated paper-based devices show advantages in simplicity and rugged backing. However, their applications are restricted by the high fluorescence background interference of conventional laminating pouches. Herein, we report a straightforward approach for minimal fluorescence background device fabrication, in which filter paper was shaped and laminated in between two biaxially oriented polypropylene (OPP) and polyvinyl butyral (PVB) composite films. This composite film provides mechanical strength for enhanced device durability, protection from environmental contamination, and prevents reagent degradation...
April 22, 2017: Analytica Chimica Acta
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