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https://www.readbyqxmd.com/read/28636112/fluorescent-carbon-nanoparticles-obtained-from-charcoal-via-green-methods-and-their-application-for-sensing-fe-3-in-an-aqueous-medium
#1
Rajesh Patidar, Babulal Rebary, Dhruti A Sanghani, Gopala Ram Bhadu, Parimal Paul
Two green methods (microwave and hydrothermal) were employed for the preparation of water dispersible fluorescent carbon nanoparticles (CNPs) from activated charcoal. Microwave and hydrothermally synthesized carbon nanoparticles, (MW-CNPs) and (HT-CNPs), respectively were characterized by microscopic and spectroscopic techniques. A detailed study of their fluorescence characteristics was made. MW-CNPs and HT-CNPs were tested for metal ion selectivity in aqueous medium. MW-CNPs showed selectivity for Fe(3+) among the tested metal ions and important studies such as for interference, linear range and limit of detection were carried out...
June 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28634761/unveiling-the-compositional-variety-of-cardiolipins-in-rhodobacter-sphaeroides-by-liquid-chromatography-with-electrospray-ionization-and-multistage-collision-induced-dissociation-mass-spectrometry
#2
Sara Granafei, Ilario Losito, Massimo Trotta, Angela Agostiano, Francesco Palmisano, Tommaso R I Cataldi
Cardiolipins (CL) contained in the lipid extracts of the photosynthetic bacterium Rhodobacter sphaeroides (strain R26) were systematically characterized by reversed-phase liquid chromatography coupled to electrospray ionization mass spectrometry, performed in single (MS), tandem (MS/MS) and sequential (MS(3)) modes using a linear ion trap mass spectrometer. The total number of carbon atoms and C=C bonds of each CL and, subsequently, those related to each of the constituting phosphatidic acid (PA) units, along with the location of the latter on the central glycerol backbone, were inferred from MS and MS/MS data, respectively...
June 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28633523/the-effect-of-pseudomonas-fluorescens-on-buried-steel-pipeline-corrosion
#3
Amy J Spark, Ivan S Cole, Adam S Best, David W Law, Liam P Ward
Buried steel infrastructure can be a source of iron ions for bacterial species, leading to microbiologically influence corrosion (MIC). Localised corrosion of pipelines due to MIC is one of the key failure mechanisms of buried steel pipelines. In order to better understand the mechanisms of localised corrosion in soil, semi-solid agar has been developed as an analogue for soil. Here, Pseudomonas fluorescens has been introduced to the system to understand how bacteria interact with steel. Through electrochemical testing including open circuit potentials, potentiodynamic scans, anodic potential holds and electrochemical impedance spectroscopy it has been shown that P...
June 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28632432/serum-micrornas-as-early-indicators-for-estimation-of-exposure-degree-in-response-to-ionizing-irradiation
#4
Wenjun Wei, Jinpeng He, Jufang Wang, Nan Ding, Bing Wang, Sulan Lin, Xurui Zhang, Junrui Hua, He Li, Burong Hu
Exposure to ionizing radiation from nuclear devices, spaceflights or terrorist attacks represents a major threat to human health and public security. After a radiological incident, noninvasive biomarkers that can facilitate rapid assessment of exposure risk in the early stages are urgently needed for optimal medical treatment. Serum microRNAs (miRNAs) are ideal biomarkers because they are stable in response to environmental changes, they are common among different species and are easily collected. Here, we performed miRNA PCR arrays to analyze miRNA expression profiles at 24 h postirradiation...
June 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28632270/silicon-anodes-protected-by-a-nitrogen-doped-porous-carbon-shell-for-high-performance-lithium-ion-batteries
#5
Jinhui Zhu, Jun Yang, Zhixin Xu, Jiulin Wang, Yanna Nuli, Xiaodong Zhuang, Xinliang Feng
Silicon (Si) anodes, which are among the most promising candidates for high-energy lithium-ion batteries (LIBs), have attracted considerable attention from both academic and industrial communities. However, Si anodes usually suffer from an inherently low conductivity and extremely large volume change during the lithiation and delithiation processes, and consequently exhibit an inferior rate capability and poor cycle life. In this paper, we report new porous polymer-derived carbon coated Si nanoparticles (NPs) as the next generation anodes for LIBs to overcome these serious problems...
June 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28631796/isomerization-versus-dissociation-of-phenylalanylglycyltryptophan-radical-cations
#6
Xiaoyan Mu, Justin Kai-Chi Lau, Cheuk-Kuen Lai, K W Michael Siu, Alan C Hopkinson, Ivan K Chu
Four isomers of the radical cation of tripeptide phenylalanylglycyltryptophan, in which the initial location of the radical center is well defined, have been isolated and their collision-induced dissociation (CID) spectra examined. These ions, the π-centered [FGWπ˙](+), α-carbon- [FGα˙W](+), N-centered [FGWN˙](+) and ζ-carbon- [Fζ˙GW](+) radical cations, were generated via collision-induced dissociation (CID) of transition metal-ligand-peptide complexes, side chain fragmentation of a π-centered radical cation, homolytic cleavage of a labile nitrogen-nitrogen single bond, and laser induced dissociation of an iodinated peptide, respectively...
June 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28631625/high-loading-fe2o3-swnt-composite-films-for-lithium-ion-battery-applications
#7
Ying Wang, Jiahui Guo, Li Li, Yali Ge, Baojun Li, Yingjiu Zhang, Yuanyuan Shang, Anyuan Cao
Single-walled carbon nanotube (SWNT) films are a potential candidate as porous conductive electrodes for energy conversion and storage; tailoring the loading and distribution of active materials grafted on SWNTs is critical for achieving maximum performance. Here, we show that as-synthesized SWNT samples containing residual Fe catalyst can be directly converted to Fe2O3/SWNT composite films by thermal annealing in air. The mass loading of Fe2O3 nanoparticles is tunable from 63 wt.% up to 96 wt.%, depending on the annealing temperature (from 450 C to 600 C), while maintaining the porous network structure...
June 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28625047/asymmetric-synthesis-of-the-antiviral-diterpene-wickerol-a
#8
Shu-An Liu, Dirk Trauner
Wickerol A (1) is an unusual diterpene with remarkable activity against H1N1 influenza virus. Its tetracyclic skeleton contains three quaternary carbons and is marked by several syn-pentane interactions which force a six-membered ring into a twist-boat conformation. We present an asymmetric synthesis of wickerol A (1) that is based on a Jung Diels-Alder reaction, an intramolecular alkylation to complete the 6-5-6-6 ring system, and a conjugate addition, all of which overcome considerable steric strain. During the synthesis, we isolated an unusual cyclopropane, which presumably stems from a carbonium ion...
June 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28624636/water-geochemistry-of-shallow-lakes-from-the-southeastern-pampa-plain-argentina-and-their-implications-on-mollusk-shells-preservation
#9
Paula A Cristini, Eleonor Tietze, Claudio G De Francesco, Daniel E Martínez
A seasonal sampling of sediments, column and interstitial water for physico-chemical analysis were performed in littoral and open water areas in three freshwater shallow lakes (Nahuel Rucá, Las Mostazas and Los Carpinchos) from Southeastern Pampa plain, Argentina. The main objective of the present study is to evaluate how the characteristics of the depositional environments could be affecting mollusk shell preservation. These lakes are very shallow (2m) and are characterized by an extensive littoral area, dominated by the emergent macrophyte Schoenoplectus californicus, which forms a complete ring around the lake, and an open water area, in general free of vegetation...
June 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28624591/safe-limit-of-arsenic-in-soil-in-relation-to-dietary-exposure-of-arsenicosis-patients-from-malda-district-west-bengal-a-case-study
#10
Debasis Golui, D N Guha Mazumder, S K Sanyal, S P Datta, P Ray, P K Patra, S Sarkar, K Bhattacharya
Safe limit of arsenic in soil in relation to dietary exposure of arsenicosis patients was established in Malda district of West Bengal. Out of 182 participants examined, 80 (43.9%) participants showed clinical features of arsenicosis, characterized by arsenical skin lesion (pigmentation and keratosis), while 102 participants did not have any such lesion (control). Experimental results of the twenty eight soils (own field) of the participants showed the mean Olsen extractable and total arsenic concentration of 0...
June 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28624519/itraq-based-quantitative-proteomics-analysis-of-molecular-mechanisms-associated-with-bombyx-mori-lepidoptera-larval-midgut-response-to-bmnpv-in-susceptible-and-near-isogenic-strains
#11
Haizhong Yu, Xueyang Wang, Jiaping Xu, Yan Ma, Shangzhi Zhang, Dong Yu, Dongqiong Fei, Azharuddin Muhammad
Bombyx mori nucleopolyhedrovirus (BmNPV) has been identified as a major pathogen responsible for severe economic loss. Most silkworm strains are susceptible to BmNPV, with only a few highly resistant strains thus far identified. Here we investigated the molecular basis of silkworm resistance to BmNPV using susceptible (the recurrent parent P50) and resistant (near-isogenic line BC9) strains and a combination of iTRAQ-based quantitative proteomics, reverse-transcription quantitative PCR and Western blotting...
June 14, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28624457/effect-of-calcium-carbonate-particle-shape-on-phagocytosis-and-pro-inflammatory-response-in-differentiated-thp-1-macrophages
#12
Yosuke Tabei, Sakiko Sugino, Kenichiro Eguchi, Masahiko Tajika, Hiroko Abe, Yoshihiro Nakajima, Masanori Horie
Phagocytosis is a physiological process used by immune cells such as macrophages to actively ingest and destroy foreign pathogens and particles. It is the cellular process that leads to the failure of drug delivery carriers because the drug carriers are cleared by immune cells before reaching their target. Therefore, clarifying the mechanism of particle phagocytosis would have a significant implication for both fundamental understanding and biomedical engineering. As far as we know, the effect of particle shape on biological response has not been fully investigated...
June 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28624428/undifferentiated-sarcoma-of-the-sphenoid-sinus
#13
Masaya Nagaishi, Kensuke Suzuki, Yoshiki Sugiura, Issei Takano, Yoshihiro Tanaka, Akio Hyodo
Paranasal sinuses sarcomas are rare and no treatments have been established. We report a young-adult case of sphenoid sinus sarcoma treated by carbon-ion radiotherapy. The patient presented with progressive left-sided visual impairment. A tumor was then identified and partial resection by transnasal approach was performed. The resected mass showed typical morphology of mesenchymal tumor, and morphological and molecular analyses ruled out a predominant-differentiation phenotype. The pathological diagnosis was undifferentiated sarcoma...
June 14, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28623674/cathepsin-k-in-lymphangioleiomyomatosis-lam-cell-fibroblast-interactions-enhance-protease-activity-by-extracellular-acidification
#14
Arundhati Dongre, Debbie Clements, Andrew J Fisher, Simon R Johnson
Lymphangioleiomyomatosis (LAM) is a rare disease in which clonal LAM cells infiltrate the lungs and lymphatics. In association with recruited fibroblasts, LAM cells form nodules adjacent to lung cysts. It is hypothesized that LAM nodule-derived proteases lead to cyst formation. On protease gene-expression profiling in whole-lung tissue, cathepsin K was 40-fold overexpressed in LAM compared with control lungs (P ≤ 0.0001). Immunohistochemistry confirmed cathepsin K protein in LAM nodules but not in control lungs...
June 14, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28622806/graphitic-carbon-nitride-supported-platinum-nanocomposites-for-rapid-and-sensitive-colorimetric-detection-of-mercury-ions
#15
Yi-Wei Wang, Lixing Wang, Fengping An, Hui Xu, Zejin Yin, Shurong Tang, Huang-Hao Yang, Hongbo Song
In this study, graphitic carbon nitride supported platinum nanocomposites (g-C3N4/PtNPs) have been synthesized for the first time by an ultrasonic-assisted chemical reduction method. By using g-C3N4 as the stabilizer, Pt ions could be reduced to PtNPs by NaBH4 and uniformly deposited on the surface of g-C3N4. The resulting g-C3N4/PtNPs exhibited enhanced catalytic activity for the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB) compared to that of g-C3N4 or PtNPs alone. After interaction with Hg(2+), the catalytic activity of g-C3N4/PtNPs was effectively inhibited due to the formation of HgPt amalgam...
August 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28622631/equilibria-model-for-ph-variations-and-ion-adsorption-in-capacitive-deionization-electrodes
#16
Ali Hemmatifar, Diego I Oyarzun, James W Palko, Steven A Hawks, Michael Stadermann, Juan G Santiago
Ion adsorption and equilibrium between electrolyte and microstructure of porous electrodes are at the heart of capacitive deionization (CDI) research. Surface functional groups are among the factors which fundamentally affect adsorption characteristics of the material and hence CDI system performance in general. Current CDI-based models for surface charge are mainly based on a fixed (constant) charge density, and do not treat acid-base equilibria of electrode microstructure including so-called micropores. We here expand current models by coupling the modified Donnan (mD) model with weak electrolyte acid-base equilibria theory...
May 20, 2017: Water Research
https://www.readbyqxmd.com/read/28621790/molecular-interactions-and-thermal-transport-in-ionic-liquids-with-carbon-nanomaterials
#17
João M P França, Carlos A Nieto de Castro, Agílio A H Pádua
We used molecular dynamics simulation to study the effect of suspended carbon nanomaterials, nanotubes and graphene sheets, on the thermal conductivity of ionic liquids, an issue related to understanding the properties of nanofluids. One important aspect that we developed is an atomistic model of the interactions between the organic ions and carbon nanomaterials, so we did not rely on existing force fields for small organic molecules or assume simple combining rules to describe the interactions at the liquid/material interface...
June 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28621779/the-effective-determination-of-cd-ii-and-pb-ii-simultaneously-based-on-an-aluminum-silicon-carbide-reduced-graphene-oxide-nanocomposite-electrode
#18
Yale Wu, Tao Yang, Kuo-Chih Chou, Junhong Chen, Lei Su, Xinmei Hou
A platform for the simultaneous determination of Cd(ii) and Pb(ii) in aqueous solution has been applied based on an aluminum silicon carbide-reduced graphene oxide nanocomposite (Al4SiC4-RGO) modified bismuth film glassy carbon electrode (GCE) using square wave anodic stripping voltammetry (SWASV) for the first time. The Al4SiC4-RGO nanocomposite electrode was characterized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Compared with the Al4SiC4 modified GCE and bare GCE, the electrochemical performance of the Al4SiC4-RGO nanocomposite electrode is obviously enhanced resulting from the synergistic effects of Al4SiC4, RGO and bismuth film...
June 16, 2017: Analyst
https://www.readbyqxmd.com/read/28620972/structure-property-relationships-of-organic-electrolytes-and-their-effects-on-li-s-battery-performance
#19
REVIEW
Mohammad Rejaul Kaiser, Shulei Chou, Hua-Kun Liu, Shi-Xue Dou, Chunsheng Wang, Jiazhao Wang
Electrolytes, which are a key component in electrochemical devices, transport ions between the sulfur/carbon composite cathode and the lithium anode in lithium-sulfur batteries (LSBs). The performance of a LSB mostly depends on the electrolyte due to the dissolution of polysulfides into the electrolyte, along with the formation of a solid-electrolyte interphase. The selection of the electrolyte and its functionality during charging and discharging is intricate and involves multiple reactions and processes. The selection of the proper electrolyte, including solvents and salts, for LSBs strongly depends on its physical and chemical properties, which is heavily controlled by its molecular structure...
June 16, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28620911/distortion-of-dna-origami-on-graphene-imaged-with-advanced-tem-techniques
#20
Yoones Kabiri, Adithya N Ananth, Jaco van der Torre, Allard Katan, Jin-Yong Hong, Sairam Malladi, Jing Kong, Henny Zandbergen, Cees Dekker
While graphene may appear to be the ultimate support membrane for transmission electron microscopy (TEM) imaging of DNA nanostructures, very little is known if it poses an advantage over conventional carbon supports in terms of resolution and contrast. Microscopic investigations are carried out on DNA origami nanoplates that are supported onto freestanding graphene, using advanced TEM techniques, including a new dark-field technique that is recently developed in our lab. TEM images of stained and unstained DNA origami are presented with high contrast on both graphene and amorphous carbon membranes...
June 16, 2017: Small
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