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https://www.readbyqxmd.com/read/29223904/spatiotemporal-variations-of-hydrogeochemistry-and-its-controlling-factors-in-the-gandaki-river-basin-central-himalaya-nepal
#1
Ramesh Raj Pant, Fan Zhang, Faizan Ur Rehman, Guanxing Wang, Ming Ye, Chen Zeng, Handuo Tang
The characterization and assessment of water quality in the head water region of Himalaya is necessary, given the immense importance of this region in sustaining livelihoods of people and maintaining ecological balance. A total of 165 water samples were collected from 55 sites during pre-monsoon, monsoon and post-monsoon seasons in 2016 from the Gandaki River Basin of the Central Himalaya, Nepal. The pH, EC values and TDS concentrations were measured in-situ and the concentrations of major ions (Ca2+, Mg2+, K+, Na+, Cl-, SO42-, NO3-) and Si were analyzed in laboratory...
December 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29218577/street-foods-exacerbate-effects-of-the-environmental-burden-of-polycyclic-aromatic-hydrocarbons-pahs-in-nigeria
#2
Osazuwa Clinton Ekhator, Nnaemeka Arinze Udowelle, Sorbari Igbiri, Rose Ngozi Asomugha, Chiara Frazzoli, Orish Ebere Orisakwe
Polycyclic aromatic hydrocarbons (PAHs) are a large group of well-known toxicants with carcinogenic potential and other health effects including on the immune system. The high health risks of non-communicable diseases and relevant comorbidities in Africa, particularly in contaminated areas like e-waste and crude oil and gas exploration areas and for high consumers of food commodity groupings which are most critical for PAH exposure, are exacerbated by dietary exposure due to unsafe practices in commonly consumed foods, like those street vended...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29218471/rural-environment-study-for-water-from-different-sources-in-cluster-of-villages-in-mehsana-district-of-gujarat
#3
Nitasha Khatri, Sanjiv Tyagi, Deepak Rawtani
Water pollution and water scarcity are major environmental issues in rural and urban areas. They lead to decline in the quality of water, especially drinking water. Proper qualitative assessment of water is thus necessary to ensure that the water consumed is potable. This study aims to analyze the physicochemical parameters in different sources of water in rural areas and assess the quality of water through a classification system based on BIS and CPCB standards. The classification method has defined water quality in six categories, viz...
December 7, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29216720/testosterone-replacement-therapy-trt-and-its-effect-on-bone-marrow-how-serious-is-it-and-is-there-a-true-polyglobulia
#4
M Levcikova, J Breza, J Luha, J Dubravicky, E Kovacova, J Fillo
INTRODUCTION: TRT in men with testosterone deficiency syndrome (TDS) had multiple positive effects and restore a quality of life of affected men. Polyglobulia is the most common dose-limiting adverse effect of TRT, but the mechanisms of TRT-mediated erythropoesis remain unclear. In this study, we evaluated long term haematological side effects of TRT: polyglobulia, elevated hemoglobin (Hb) and haematocrit (Ht). METHODS: In a cross-sectional descriptive study, the authors treated 69 men with TDS and the average age 59 years and the follow-up period 81...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/29210615/dietary-exposure-to-non-dioxin-like-pcbs-of-the-hong-kong-adult-population-from-a-total-diet-study
#5
S W C Chung, J S Y Lau, J Y K Chu
Dietary exposure of the Hong Kong adults to the sum of the six indicator PCBs (Σ6 PCBs; PCB 28, 52, 101, 138, 153, and 180) was estimated in this study using the Total Diet Study (TDS) approach. Seventy one commonly-consumed food items of animal origin were sampled in four seasons and prepared as consumed in 2010-11. The results showed that the main dietary source of Σ6 PCBs to the adult population was "fish, seafood and their products" which accounted for 84.3% of the total exposure. About 50% of the total exposure was contributed by four fish species: salmon (cooked salmon and salmon sashimi (19...
December 6, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29204594/exploring-the-solid-state-phase-transition-in-dl-norvaline-with-terahertz-spectroscopy
#6
Jens Neu, Coleen T Nemes, Kevin P Regan, Michael R C Williams, Charles A Schmuttenmaer
dl-Norvaline is a molecular crystal at room temperature and it undergoes a phase transition when cooled below 190 K. This phase transition is believed to be Martensitic, thus making it of particular interest for molecular machines. In this paper we investigate this phase transition by measuring its terahertz (THz) spectrum over a range of temperatures. Temperature-dependent THz time-domain spectroscopy (THz-TDS) measurements reveal that the transition temperature (Tβ→α) is 190 K. The influence of nucleation seeds was analyzed by determining the Tβ→α of molecular crystals with varying grain size...
December 5, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29202372/groundwater-chemistry-and-radon-222-distribution-in-jerba-island-tunisia
#7
Faten Telahigue, Belgacem Agoubi, Fayza Souid, Adel Kharroubi
The present study integrates hydrogeological, hydrochemical and radiogenic data of groundwater samples taken from the Plio-Quaternary unconfined aquifer of Jerba Island, southeastern Tunisia, in order to interpret the spatial variations of the groundwater quality and identify the main hydrogeochemical factors responsible for the high ion concentrations and radon-222 content in the groundwater analysed. Thirty-nine groundwater samples were collected from open wells widespread on the island. Physical parameters (EC, pH, TDS and T °) were measured, major ions (Ca2+, Mg2+, Na+, K+, Cl-, SO42-, NO3- and HCO3-) were analysed and 222Rn concentrations were determined using a RAD7-H2O...
December 1, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29196145/effects-of-imipramine-on-cytokines-panel-in-the-rats-serum-during-the-drug-treatment-and-discontinuation
#8
M Kuśmider, A Faron-Górecka, P Pabian, J Solich, M Szlachta, M Kolasa, D Żurawek, J Wójcikowski, W Daniel, M Dziedzicka-Wasylewska
Time dependent sensitization (TDS) - phenomenon described originally by Chiodo and Antelman (1980) in context of dopamine receptors, refers to cascade of events that continue to develop in the organism, after the initiating stimulus is no longer available. Treatment could be recognized as such a initiating stimulus (in case of depression, example of electroconvulsive therapy would be obvious, but some aspects of pharmacotherapy too). The process leads to improvement, but, on the other hand, phenomena of kindling in recurrent depression is well known (more relapses and therapies make heavier and longer lasting subsequent episodes)...
November 28, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/29195957/effect-of-a-commercial-tannin-on-the-sensorial-temporality-of-astringency
#9
M Medel-Marabolí, J L Romero, E Obreque-Slier, A Contreras, A Peña-Neira
Astringency is a tactile sensation that is generated by a reduction in lubrication in the oral cavity and is generally attributed to the interaction of procyanidins or condensed tannins with salivary proteins. Several factors influence tannin-protein interactions, such as pH, alcohol, sweetness, oxygen and polyphenol content. A scarcely studied factor is the effect of the tannin content on the perception of astringency. The objective of this study was to evaluate the effect of different concentrations of commercial oenological tannin (COT) on the timing of the perception of astringency...
December 2017: Food Research International
https://www.readbyqxmd.com/read/29186849/new-possibilities-of-substance-identification-based-on-thz-time-domain-spectroscopy-using-a-cascade-mechanism-of-high-energy-level-excitation
#10
Vyacheslav A Trofimov, Svetlana A Varentsova, Irina G Zakharova, Dmitry Yu Zagursky
Using an experiment with thin paper layers and computer simulation, we demonstrate the principal limitations of standard Time Domain Spectroscopy (TDS) based on using a broadband THz pulse for the detection and identification of a substance placed inside a disordered structure. We demonstrate the spectrum broadening of both transmitted and reflected pulses due to the cascade mechanism of the high energy level excitation considering, for example, a three-energy level medium. The pulse spectrum in the range of high frequencies remains undisturbed in the presence of a disordered structure...
November 25, 2017: Sensors
https://www.readbyqxmd.com/read/29185435/terahertz-spectral-unmixing-based-method-for-identifying-gastric-cancer
#11
Yuqi Cao, Pingjie Huang, Xian Li, Weiting Ge, Dibo Hou, Guangxin Zhang
At present, many researchers are exploring biological tissue inspection using terahertz time-domain spectroscopy (THz-TDS) techniques. In this study, based on a modified hard modeling factor analysis (HMFA) method, terahertz spectral unmixing was applied to investigate the relationships between the absorption spectra in terahertz time-domain spectroscopy (THz-TDS) and certain biomarkers of gastric cancer in order to systematically identify gastric cancer. A probability distribution and box plot were used to extract the distinctive peaks that indicate carcinogenesis, and the corresponding weight distributions were used to discriminate the tissue types...
November 29, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29183799/is-testicular-dysgenesis-syndrome-a-genetic-endocrine-or-environmental-disease-or-an-unexplained-reproductive-disorder
#12
REVIEW
Jian-Sheng Xing, Zhi-Ming Bai
Progressive increases in the incidence of male reproductive disorders inclusive of hypospadias, cryptorchidism, poor semen quality, and testicular germ cell cancer (TGCC) have been observed in recent times. The central hypothesis of this study asserted that these disorders may all collectively signify testicular dysgenesis syndrome (TDS). This review aimed to provide evidence verifying the reality of TDS based on four key aspects: environmental endocrine-disrupting chemicals (EDCs), genetic factors, intrauterine growth disorders and lifestyle factors...
November 25, 2017: Life Sciences
https://www.readbyqxmd.com/read/29181225/assessment-of-the-efficacy-of-home-remedial-methods-to-improve-drinking-water-quality-in-two-major-aquifer-systems-in-jaffna-peninsula-sri-lanka
#13
W M Dimuthu Nilmini Wijeyaratne, Suvendran Subanky
Chunnakam and Vadamaradchi are two major aquifer systems in Jaffna Peninsula, Sri Lanka. This study was performed to compare water quality in the domestic wells in these aquifers and to assess the efficacy of household water treatments for treating contaminated water. Replicate well water samples were collected from each aquifer and pH, dissolved oxygen (DO), conductivity, total dissolved solids (TDS), salinity, temperature, total solids (TS), total hardness (TH), chemical oxygen demand (COD), oil and grease (OG), nitrate N (N), and total phosphate (TP) were measured...
2017: Scientifica
https://www.readbyqxmd.com/read/29179069/renewable-energy-powered-membrane-technology-impact-of-ph-and-ionic-strength-on-fluoride-and-natural-organic-matter-removal
#14
Isaac Owusu-Agyeman, Junjie Shen, Andrea Iris Schäfer
Real water pH and ionic strength vary greatly, which influences the performance of membrane processes such as nanofiltration (NF) and reverse osmosis (RO). Systematic variation of pH (3-12) and ionic strength (2-10g/L as total dissolved solids (TDS)) was undertaken with a real Tanzanian water to investigate how water quality affects retention mechanisms of fluoride (F) and natural organic matter (NOM). An autonomous solar powered NF/RO system driven by a solar array simulator was supplied with constant power from a generator...
November 23, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29175139/in-vitro-in-vivo-correlations-for-nicotine-transdermal-delivery-systems-evaluated-by-both-in-vitro-skin-permeation-ivpt-and-in-vivo-serum-pharmacokinetics-under-the-influence-of-transient-heat-application
#15
Soo Hyeon Shin, Sherin Thomas, Sam G Raney, Priyanka Ghosh, Dana C Hammell, Samer S El-Kamary, Wilbur H Chen, M Melissa Billington, Hazem E Hassan, Audra L Stinchcomb
The in vitro permeation test (IVPT) has been widely used to characterize the bioavailability (BA) of compounds applied on the skin. In this study, we performed IVPT studies using excised human skin (in vitro) and harmonized in vivo human serum pharmacokinetic (PK) studies to evaluate the potential in vitro-in vivo correlation (IVIVC) of nicotine BA from two, matrix-type, nicotine transdermal delivery systems (TDS). The study designs used for both in vitro and in vivo studies included 1h of transient heat (42±2°C) application during early or late time periods post-dosing...
November 21, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29174669/application-of-terahertz-spectroscopy-and-theoretical-calculation-in-dimethylurea-isomers-investigation
#16
Yonghong Zhao, Zhi Li, Jianjun Liu, Tao Chen, Huo Zhang, Binyi Qin, Yifang Wu
The characteristic absorption spectra of two structural isomers of dimethylurea(DMU) in 0.6-1.8 THz region have been measured using terahertz time-domain spectroscopy (THZ-TDS) at room temperature. Significant differences have been found between their terahertz spectra and implied that the THZ-TDS is an effective means of identifying structural isomers. To simulate their spectra, calculations on single molecule and cluster of 1,1-DMU and 1,3-DMU were performed, and we found that the cluster calculations using DFT-D3 method are better to predict the experimental spectra...
November 22, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29169107/mechanistic-insights-into-alginate-fouling-caused-by-calcium-ions-based-on-terahertz-time-domain-spectra-analyses-and-dft-calculations
#17
Meijia Zhang, Huachang Hong, Hongjun Lin, Liguo Shen, Haiying Yu, Guangcai Ma, Jianrong Chen, Bao-Qiang Liao
Fouling mechanisms underlying the filtration behaviors of alginate solution caused by calcium addition were investigated by Terahertz time-domain spectroscopy (THz-TDS) and density functional theory (DFT) techniques. Filtration tests showed that specific filtration resistance (SFR) of alginate solution (0.75 g L(-1)) monotonously increased with calcium addition at a relatively low range of calcium concentration (0-1.0 mM), and SFR (2.61 × 10(15) m kg(-1)) of alginate solution with 1.0 mM calcium addition was extremely high as compared with sludge suspension...
November 14, 2017: Water Research
https://www.readbyqxmd.com/read/29161990/efficient-phenol-removal-from-petrochemical-wastewater-using-biochar-la-ultrasonic-persulphate-system-characteristics-reusability-and-kinetic-study
#18
Rasool Razmi, Bahman Ramavandi, Mehdi Ardjmand, Amir Heydarinasab
The entry of phenol into the environment causes damage to humans and living beings. Hence, it is essential to reduce phenol concentration from wastewaters to below standard level. This research has analysed the physio-chemical properties of a catalyst that has been developed-biochar-La, including BJH, BET, EDX, SEM, FTIR, pHpzc, and iodine number. The catalyst consisted of effective functional groups, including C=S, C-O, C=C, -COOH and O-H, with a specific surface area of 31.2 m(2)/g. The catalyst was used in the biochar-La/ultrasonic/persulphate system to remove phenol from wastewater...
November 22, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29160904/three-dimensional-accuracy-of-digital-static-interocclusal-registration-by-three-intraoral-scanner-systems
#19
Kuan Yee Wong, Roxanna Jean Esguerra, Vanessa Ai Ping Chia, Ying Han Tan, Keson Beng Choon Tan
PURPOSE: Prior studies have defined the accuracy of intraoral scanner (IOS) systems but the accuracy of the digital static interocclusal registration function of these systems has not been reported. This study compared the three-dimensional (3D) accuracy of the digital static interocclusal registration of 3 IOS systems using the buccal bite scan function. MATERIALS AND METHODS: Three IOS systems compared were 3MTM True Definition Scanner (TDS), TRIOS Color (TRC), and CEREC AC with CEREC Omnicam (CER)...
November 21, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29157599/skin-lesions-of-birt-hogg-dub%C3%A3-syndrome-clinical-and-histopathological-findings-in-31-japanese-patients-who-presented-with-pneumothorax-and-or-multiple-lung-cysts
#20
Chikako Iwabuchi, Hiroki Ebana, Akira Ishiko, Azusa Negishi, Teruaki Mizobuchi, Toshio Kumasaka, Masatoshi Kurihara, Kuniaki Seyama
BACKGROUND: Birt-Hogg-Dubé syndrome (BHDS) (OMIM #135150) is an autosomal dominant disease, characterized by fibrofolliculomas (FFs) of the skin, pulmonary cysts with/without pneumothorax, and renal tumors. The prevalence of skin manifestations reported for Japanese BHDS patients is lower (<30%) compared with that of Western countries (75∼90%), which appear to be underestimated. OBJECTIVE: To precisely examine the prevalence of skin lesions with dermoscopy and histopathology with reference to genetic analyses...
November 2, 2017: Journal of Dermatological Science
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