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https://www.readbyqxmd.com/read/29454300/gold-copper-bimetallic-nanoparticles-supported-on-nano-p-zeolite-modified-carbon-paste-electrode-as-an-efficient-electrocatalyst-and-sensitive-sensor-for-determination-of-hydrazine
#1
Fatemeh Amiripour, Seyed Naser Azizi, Shahram Ghasemi
In this report, a facile, efficient and low cost electrochemical sensor based on bimetallic Au-Cu nanoparticles supported on P nanozeolite modified carbon paste electrode (Au-Cu/NPZ/CPE) was constructed and its efficiency for determination of hydrazine in trace level was studied. For this purpose, agro waste material, stem sweep ash (SSA) was employed as the starting material (silica source) for the synthesis of nano P zeolite (NPZ). After characterization of the synthesized NPZ by analytical instruments (scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy), construction of Au-Cu/NPZ/CPE was performed by three steps procedure involving preparation of nano P zeolite modified carbon paste electrode (NPZ/CPE), introducing Cu +2 ions into nano zeolite structure by ion exchange and electrochemical reduction of Cu +2 ions upon applying constant potential...
February 5, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29454260/solar-photo-fenton-treatment-of-microcystin-lr-in-aqueous-environment-transformation-products-and-toxicity-in-different-water-matrices
#2
Akin Karci, Elizabeth M Wurtzler, Armah A de la Cruz, David Wendell, Dionysios D Dionysiou
Transformation products and toxicity patterns of microcystin-LR (MC-LR), a common cyanotoxin in freshwaters, during degradation by solar photo-Fenton process were studied in the absence and presence of two major water components, namely fulvic acid and alkalinity. The transformation products m/z 795, 835, 515/1030 and 532 can be formed through attack of OH on the conjugated carbon double bonds of Adda. Transformation products with m/z 1010, 966 and 513 can be generated through the attack of OH on the methoxy group of Adda...
January 2, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29454252/human-papillomavirus-detection-using-pcr-and-atr-ftir-for-cervical-cancer-screening
#3
Taciana Rymsza, Eliane Aline Ribeiro, Luis Felipe das Chagas E Silva de Carvalho, Tanmoy Bhattacharjee, Renata de Azevedo Canevari
The human papillomavirus (HPV) genital infection is considered one of the most common sexually transmitted diseases worldwide, and has been associated with cervical cancer. The objective of this study was to investigate the efficacy of the diagnostic methods: polymerase chain reaction (PCR) and Fourier transform infrared (FTIR) equipped with an ATR (Attenuated Total Reflectance) unit (Pike Tech) spectroscopy, to diagnose HPV infection in women undergoing gynecological examination. Seventeen patients (41.46%) of the 41 patients analyzed were diagnosed with exophytic/condyloma acuminate lesions by clinical analysis, 29 patients (70...
February 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29454238/transformations-of-dissolved-organic-matter-induced-by-uv-photolysis-hydroxyl-radicals-chlorine-radicals-and-sulfate-radicals-in-aqueous-phase-uv-based-advanced-oxidation-processes
#4
Lathika Varanasi, Erica Coscarelli, Maryam Khaksari, Lynn R Mazzoleni, Daisuke Minakata
Considering the increasing identification of trace organic contaminants in natural aquatic environments, the removal of trace organic contaminants from water or wastewater discharge is an urgent task. Ultraviolet (UV) and UV-based advanced oxidation processes (AOPs), such as UV/hydrogen peroxide (UV/H 2 O 2 ), UV/free chlorine and UV/persulfate, are attractive and promising approaches for the removal of these contaminants due to the high reactivity of active radical species produced in these UV-AOPs with a wide variety of organic contaminants...
February 8, 2018: Water Research
https://www.readbyqxmd.com/read/29454218/atmospheric-pattern-of-volatile-organochlorine-compounds-and-hexachlorobenzene-in-the-surroundings-of-a-chlor-alkali-plant
#5
Barend L van Drooge, Esther Marco, Joan O Grimalt
The outdoor atmospheric distributions of chlorinated volatile organic compounds (VOCs) from locations receiving the emissions of a chlor-alkali plant have been studied. Trichloroethylene and tetrachloroethylene (medians 2.4 μg/m 3 and 1.7 μg/m 3 , respectively) were the most abundant compounds, which was in accordance with the production processes from these installations. The concentrations of trichlorofluoromethane, median 1.6 μg/m 3 , are rather similar to the average levels described in general in the troposphere and cannot be attributed to this specific source...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454201/nitrous-oxide-emissions-from-near-zero-water-exchange-brackish-recirculating-aquaculture-systems
#6
Uri Yogev, Adiel Atari, Amit Gross
The development of intensive recirculating aquaculture systems (RAS) with low water exchange has accelerated in recent years as a result of environmental, economic and other concerns. In these systems, fish are commonly grown at high density, 50 to 150kg/m 3 , using high-protein (30%-60%) feeds. Typically, the RAS consists of a solid treatment and a nitrification unit; in more advanced RAS, there is an additional denitrification step. Nitrous oxide (N 2 O), a byproduct during nitrification and denitrification processes, is a potent greenhouse gas that destroys the ozone layer...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454056/biophysical-and-immunological-characterization-of-2-drib-modified-hsa-and-its-implications-in-diabetes-mellitus
#7
Ishrat Jahan Saifi, Km Neelofar, M R Ajmal, Sheelu Shafiq Siddiqi
Glycoxidation of protein may lead to develop diabetes. In the present study, different concentrations of 2-deoxy d-ribose (2-dRib) were used to modify human serum albumin (HSA). Nitro Blue Tetrazolium (NBT) assay results showed that yield of the fructosamine content was directly proportional to the concentration of 2-dRib. UV and fluorescence spectroscopy results showed an increment in hyperchromicity and decrease in fluorescence intensity of 2-dRib modified HSA as compared to native HSA. Further secondary structural changes were confirmed by UV-circular dichroism (UV-CD) and Fourier transform infrared spectroscopy (FT-IR)...
February 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29454054/genomic-perspectives-of-spider-silk-genes-through-target-capture-sequencing-conservation-of-stabilization-mechanisms-and-homology-based-structural-models-of-spidroin-terminal-regions
#8
Matthew A Collin, Thomas H Clarke, Nadia A Ayoub, Cheryl Y Hayashi
A powerful system for studying protein aggregation, particularly rapid self-assembly, is spider silk. Spider silks are proteinaceous and silk proteins are synthesized and stored within silk glands as liquid dope. As needed, liquid dope is near-instantaneously transformed into solid fibers or viscous adhesives. The dominant constituents of silks are spidroins (spider fibroins) and their terminal domains are vital for the tight control of silk self-assembly. To better understand spidroin termini, we used target capture and deep sequencing to identify spidroin gene sequences from six species representing the araneoid families of Araneidae, Nephilidae, and Theridiidae...
February 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29453974/genetically-modified-bone-mesenchymal-stem-cells-with-tgf-%C3%AE-3-improve-wound-healing-and-reduce-scar-tissue-formation-in-a-rabbit-model
#9
Mingyong Li, Lin Qiu, Wei Hu, Xiang Deng, Hanfeng Xu, Youhan Cao, Zijian Xiao, Liangyu Peng, Shawn Johnson, Lyundup Alexey, Paul A Kingston, Qing Li, Yuanyuan Zhang
Extensive scar tissue formation often occurs after severe burn injury, trauma, or as one of complications after surgical intervention. Despite significant therapeutic advances, it is still a significant challenge to manage massive scar tissue formation while also promoting normal wound healing. The goal of this study was to investigate the therapeutic effect of bone mesenchymal stem cells (BMSCs) that were genetically modified to overexpress transforming growth factor-beta 3 (TGF-β 3 ), an inhibitor of myofibroblast proliferation and collagen type I deposition, on full-thickness cutaneous wound healing in a rabbit model...
February 14, 2018: Experimental Cell Research
https://www.readbyqxmd.com/read/29453964/conidiogenesis-related-dna-photolyase-gene-in-beauveria-bassiana
#10
Se Jin Lee, Mi Rong Lee, Sihyeon Kim, Jong Cheol Kim, So Eun Park, Tae Young Shin, Jae Su Kim
Beauveria bassiana is an entomopathogenic fungi used in environmentally mindful pest management. Its main active ingredient, conidia, is commercially available as a fungal biopesticide. Many studies of conidia production have focused on how to optimize culture conditions for maximum productivity and stability against unfavorable abiotic factors. However, understanding of how conidiogenesis-related genes provide improved conidial production remains unclear. In this study, we focus on identifying conidiogenesis-related genes in B...
February 14, 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29453909/a-headspace-gas-chromatography-method-for-isopropanol-determination-in-warfarin-sodium-products-as-a-measure-of-drug-crystallinity
#11
Ziyaur Rahman, Sohail Akhtar, Akhtar Siddiqui, Anthony B Ciavarella, Agnes Nguyenpho, Patrick J Faustino, Mansoor A Khan
Coumadin® a nd s everal generic products of warfarin s odium (WS) contain the crystalline form (clathrate) in which WS and isopropanol (IPA) are associated in a 2:1 molar ratio. IPA is critical in maintaining the WS crystalline structure. Physicochemical properties of the drug and drug product may change when the crystalline drug transforms to amorphous form. A headspace-gas chromatography (HS-GC) method was developed and validated for IPA determination in the WS drug product. n-propanol (NPA) was used as internal standard and the method was validated for specificity, system suitability, linearity, accuracy, precision, range, limits of detection and quantification, and robustness...
March 1, 2018: Acta Pharmaceutica
https://www.readbyqxmd.com/read/29453846/fabrication-of-miniature-elastomer-lenses-with-programmable-liquid-mold-for-smartphone-microscopy-curing-polydimethylsiloxane-with-in-situ-curvature-control
#12
Bhuvaneshwari Karunakaran, Joseph Tharion, Arvind Ramrao Dhawangale, Debjani Paul, Soumyo Mukherji
Miniature lenses can transform commercial imaging systems, e.g., smartphones and webcams, into powerful, low-cost, handheld microscopes. To date, the reproducible fabrication of polymer lenses is still a challenge as they require controlled dispensing of viscous liquid. This paper reports a reproducible lens fabrication technique using liquid mold with programmable curvature and off-the-shelf materials. The lens curvature is controlled during fabrication by tuning the curvature of an interface of two immiscible liquids [polydimethylsiloxane (PDMS) and glycerol]...
February 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29453768/mental-rotation-in-false-belief-understanding
#13
Jiushu Xie, Him Cheung, Manqiong Shen, Ruiming Wang
This study examines the spontaneous use of embodied egocentric transformation (EET) in understanding false beliefs in the minds of others. EET involves the participants mentally transforming or rotating themselves into the orientation of an agent when trying to adopt his or her visuospatial perspective. We argue that psychological perspective taking such as false belief reasoning may also involve EET because of what has been widely reported in the embodied cognition literature, showing that our processing of abstract, propositional information is often grounded in concrete bodily sensations which are not apparently linked to higher cognition...
February 17, 2018: Cognitive Science
https://www.readbyqxmd.com/read/29453733/egfp-transgene-a-useful-tool-to-track-transplanted-bone-marrow-mononuclear-cell-contribution-to-peripheral-remyelination
#14
Gonzalo Piñero, Vanina Usach, Paula A Soto, Paula V Monje, Patricia Setton-Avruj
Bone marrow mononuclear cells (BMMC) constitute a heterogeneous population with potential to promote tissue regeneration. For this reason, this cell fraction has recently become a therapeutic alternative to mesenchymal stem cells, as culture is not required and phenotypic transformations can be hence avoided. In this work, and in order to attain long-lasting cell labeling and study longer survival times, we used BMMC isolated from adult transgenic rats expressing GFP to reproduce our wild type model and evaluate their remyelination ability in a reversible model of Wallerian degeneration...
February 16, 2018: Transgenic Research
https://www.readbyqxmd.com/read/29453732/the-influence-of-postgraduate-qualifications-on-educational-identity-formation-of-healthcare-professionals
#15
Ahsan Sethi, Susie Schofield, Sean McAleer, Rola Ajjawi
Demand for postgraduate qualifications in medical education can be judged by the increase in providers worldwide over the last two decades. However, research into the impact of such courses on identity formation of healthcare professionals is limited. This study investigates the influence of such programmes on graduates' educational identities, practices and career progression. Informed by constructivist grounded theory (CGT), semi-structured interviews were conducted with 27 graduates (2008-2012) from one postgraduate programme, who were at different stages in their careers worldwide...
February 16, 2018: Advances in Health Sciences Education: Theory and Practice
https://www.readbyqxmd.com/read/29453715/the-influence-of-heavy-metals-polyaromatic-hydrocarbons-and-polychlorinated-biphenyls-pollution-on-the-development-of-antibiotic-resistance-in-soils
#16
Andrey Vladimirovich Gorovtsov, Ivan Sergeevich Sazykin, Marina Alexandrovna Sazykina
The minireview is devoted to the analysis of the influence of soil pollution with heavy metals, polyaromatic hydrocarbons (PAHs), and the polychlorinated biphenyls (PCBs) on the distribution of antibiotics resistance genes (ARGs) in soil microbiomes. It is shown that the best understanding of ARGs distribution process requires studying the influence of pollutants on this process in natural microbiocenoses. Heavy metals promote co-selection of genes determining resistance to them together with ARGs in the same mobile elements of a bacterial genome, but the majority of studies focus on agricultural soils enriched with ARGs originating from manure...
February 16, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29453663/the-rice-fruit-weight-2-2-like-gene-family-member-osfwl4-is-involved-in-the-translocation-of-cadmium-from-roots-to-shoots
#17
Wentao Xiong, Peng Wang, Tianze Yan, Baobao Cao, Jun Xu, Defang Liu, Meizhong Luo
Heterogeneous expression of the rice genes "fruit-weight 2.2-like" (OsFWL) affects Cd resistance in yeast, and OsFWL4 mediates the translocation of Cd from roots to shoots. Cadmium (Cd) induces chronic and toxic effects in humans. In a previous study (Xu et al. in Planta 238:643-655, 2013), we cloned the rice genes, designated OsFWL1-8, homologous to the tomato fruit-weight 2.2. Here, we show that expression of genes OsFWL3-7 in yeast confers resistance to Cd. The Cd contents of OsFWL3-, -4-, -6- and -7-transformed Cd(II)-sensitive yeast mutant ycf1 cells were strongly decreased compared with those of empty vector, with the strongest resistance to Cd observed in cells expressing OsFWL4...
February 7, 2018: Planta
https://www.readbyqxmd.com/read/29453563/rabbit-sertoli-cells-immunohistochemical-profile-from-neonatal-to-adult-age
#18
Valeria Grieco, Barbara Banco
Immunohistochemistry (IHC) on formalin-fixed paraffin-embedded tissue specimens is a widely used laboratory technique that allows the demonstration and the direct microscopical observation of antigens within tissue sections by means of specific antibodies. IHC is one the best tools to define the immunophenotype of a cell during maturation or neoplastic transformation.To investigate the immunophenotype of postnatal rabbit Sertoli cell, from neonatal to adult age, in this chapter, the immunohistochemical protocol described is one of the most common: the avidin-biotin complex (ABC) method...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29453509/critical-thresholds-for-eventual-extinction-in-randomly-disturbed-population-growth-models
#19
Scott D Peckham, Edward C Waymire, Patrick De Leenheer
This paper considers several single species growth models featuring a carrying capacity, which are subject to random disturbances that lead to instantaneous population reduction at the disturbance times. This is motivated in part by growing concerns about the impacts of climate change. Our main goal is to understand whether or not the species can persist in the long run. We consider the discrete-time stochastic process obtained by sampling the system immediately after the disturbances, and find various thresholds for several modes of convergence of this discrete process, including thresholds for the absence or existence of a positively supported invariant distribution...
February 16, 2018: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/29453507/interprofessional-education-opportunities-and-challenges-for-psychology
#20
Wendy Ward, Alexandra Zagoloff, Cortney Rieck, William Robiner
This manuscript is an outgrowth of an invited panel presentation at the national Association for Psychologists in Academic Health Centers Conference in 2017 on Interprofessional Education (IPE). IPE is a structured and transformative educational strategy designed to provide active learning experiences where trainees from diverse healthcare professions gain shared content knowledge plus collaboration skills as they learn about, from, and with each other. Collaboration skills include understanding professional role distinctions and overlap, effective team-based communication, shared values/ethics and respect for each other's expertise, and teamwork dynamics...
February 16, 2018: Journal of Clinical Psychology in Medical Settings
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