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https://www.readbyqxmd.com/read/28738652/volatile-composition-of-merlot-red-wine-and-its-contribution-to-the-aroma-optimization-and-validation-of-analytical-method
#1
Stefany Grützmann Arcari, Vinicius Caliari, Marla Sganzerla, Helena Teixeira Godoy
A methodology for the determination of volatile compounds in red wine using headspace solid phase microextraction (HS-SPME) combined with gas chromatography-ion trap/ mass spectrometry (GC-IT/MS) and flame ionization detector (GC -FID) was developed, validated and applied to a sample of Brazilian red wine. The optimization strategy was conducted using the Plackett-Burman design for variable selection and central composite rotational design (CCRD). The response surface methodology showed that the performance of the extraction of the volatile compounds using divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber is improved with no sample dilution, the addition of 30% NaCl, applying an extraction temperature of 56°C and extraction time of 55min...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738604/electrochemical-investigation-and-determination-of-procaterol-hydrochloride-on-poly-glutamic-acid-carboxyl-functionalized-multiwalled-carbon-nanotubes-polyvinyl-alcohol-modified-glassy-carbon-electrode
#2
Dexian Kong, Lili Jiang, Yijun Liu, Zeming Wang, Libin Han, Rixin Lv, Jiandi Lin, Chun-Hua Lu, Yuwu Chi, Guonan Chen
Poly(glutamic acid) (P-GLU)/carboxyl functionalized multiwalled carbon nanotubes (MWCNTs-COOH)/polyvinyl alcohol (PVA) modified glassy carbon electrode (GCE) has been successfully prepared and the electrochemical behavior of procaterol hydrochloride (ProH) was studied. The results show that the as-prepared modified electrode exhibits a good electrocatalytic property towards the oxidation of ProH in 0.2M phosphate buffer solution (PBS) (pH 6.0) due to the enhanced oxidation peak current at ~+0.59V. Under optimal reaction conditions, the oxidation peak current of ProH is proportional to its concentration in the linear dynamic ranges of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738504/prevention-of-melanin-formation-during-aryl-alcohol-oxidase-production-under-growth-limited-conditions-using-an-aspergillus-nidulans-cell-factory
#3
Oscar Pardo-Planas, Rolf A Prade, Michael Müller, Hasan K Atiyeh, Mark R Wilkins
An Aspergillus nidulans cell factory was genetically engineered to produce an aryl alcohol oxidase (AAO). The cell factory initiated production of melanin when growth-limited conditions were established using stationary plates and shaken flasks. This phenomenon was more pronounced when the strain was cultured in a trickle bed reactor (TBR). This study investigated different approaches to reduce melanin formation in fungal mycelia and liquid medium in order to increase the enzyme production yield. Removal of copper from the medium recipe reduced melanin formation in agar cultures and increased enzyme activities by 48% in agitated liquid cultures...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738476/-relationship-between-risk-factors-of-liver-cancer-and-onset-age-in-ningxia-hui-autonomous-region
#4
Q Liu, B Liu, G R Ding
Objective: To investigate the clinical data of patients with hepatocellular carcinoma in Ningxia Hui Autonomous Region through questionnaire survey, explore the association between the risk factors of liver cancer and the onset age of disease in this area and provide evidence for prevention and treatment of liver diseases. Methods: A retrospectively analysis was conducted in 250 patients with primary hepatocellular carcinoma by using their clinical data collected through questionnaire survey to understand the relationship between gender, smoking, alcohol use, hypertension, diabetes mellitus, hyperlipidemia, family history of liver cancer, liver cirrhosis, HBV infection, eating fish history and other factors and the incidence of hepatocellular carcinoma by univariate and logistic multivariate regression models...
July 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28738470/-prevalence-of-hypercholesterolemia-and-influence-factors-in-residents-aged-18-65-years-in-beijing
#5
B Jiang, A J Ma, H Li, K Fang, J Dong, J Xie, K Qi, C Xie, Y Zhou, Y Zhao, Z Dong
Objective: To understand the prevalence of hypercholesterolemia and related risk factors in residents aged 18-65 years in Beijing and provide scientific evidence for the prevention and control of hypercholesterolemia. Methods: The data were collected from Beijing Non-communicable and Chronic Disease Survey and stratified cluster sampling method was used to select study subjects, and questionnaire investigation, physical measurement and laboratory examination were conducted to collect information. Results: The prevalence of hypercholesterolemia and borderline hypercholesterolemia was 6...
July 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28738462/-risk-factors-of-gout-in-jinchang-cohort-a-cox-regression-analysis
#6
C L He, N Cheng, Y M Rong, H Y Li, J S Li, J Ding, X B Hu, H Q Pu, X W Ren, Y N Bai
Objective: To explore the incidence and risk factors of gout in Jinchang cohort and provide scientific evidence for the prevention and control of gout. Methods: People without gout detected by baseline survey in Jinchang cohort were selected as study subjects. All the subjects were followed up through questionnaire interview, physical examination as well as laboratory test from January 24, 2013 to November 24, 2015. Cox regression model was used to analyze the risk factors for gout in Jinchang cohort. In addition, log-linear model was used to analyze the interaction between risk factors...
July 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28738443/urethral-injection-therapy-for-urinary-incontinence-in-women
#7
REVIEW
Vivienne Kirchin, Tobias Page, Phil E Keegan, Kofi Om Atiemo, June D Cody, Samuel McClinton, Patricia Aluko
BACKGROUND: Urinary incontinence imposes a significant health and economic burden to society. Periurethral or transurethral injection of bulking agents is a minimally invasive surgical procedure used as one the surgical treatments of stress urinary incontinence (SUI) in adult women. OBJECTIVES: To assess the effects of periurethral or transurethral injection therapy on the cure or improvement of urinary incontinence in women. SEARCH METHODS: We searched the Cochrane Incontinence Group Specialised Trials Register (searched 8 November 2010) and the reference lists of relevant articles...
July 25, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28738434/-perception-of-the-liver-allocation-system-by-different-stakeholders
#8
Christine Englschalk, Markus Guba
The German Transplant Law is the legal basis of the liver allocation system in Germany and is specified by the guidelines of the German Medical Association. These guidelines are based on current medical knowledge. The procedure of developing these guidelines was formalised and made transparent.This survey with 502 participants examines how four current aspects of the allocation system are perceived by different stakeholders (medical staff, patients on the liver transplant list or already transplanted, medical students and non-medical university personnel and students)...
July 24, 2017: Zentralblatt Für Chirurgie
https://www.readbyqxmd.com/read/28738364/risk-factors-for-community-acquired-pneumonia-in-adults-a-systematic-review-of-observational-studies
#9
Jordi Almirall, Mateu Serra-Prat, Ignasi Bolíbar, Valentina Balasso
We performed a systematic review of the literature to establish conclusive evidence of risk factors for community-acquired pneumonia (CAP). Observational studies (cross-sectional, case-control, and cohort studies) the primary outcome of which was to assess risk factors for CAP in both hospitalized and ambulatory adult patients with radiologically confirmed pneumonia were selected. The Newcastle-Ottawa Scale specific for cohort and case-control designs was used for quality assessment. Twenty-nine studies (20 case-control, 8 cohort, and 1 cross-sectional) were selected, with 44...
July 25, 2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28738332/neuroprogression-and-immune-activation-in-major-depressive-disorder
#10
Jeffrey H Meyer
Traditionally, the neurobiology of major depressive disorder (MDD) has been largely considered from the perspective of the state of major depressive episodes (MDE) versus being in remission, but the current accumulation of disease markers, largely acquired cross-sectionally, is strongly suggestive of neuroprogressive aspects of MDD. This chapter focuses on the changes in disease markers involved in the reorganization of the nervous system in MDD, including the translocator protein (TSPO; an index of microglial activation), glial fibrillary acidic protein (GFAP; an index of astroglial activation), [11C]harmine (a marker of monoamine oxidase A; MAO-A), and several other indices (metabotropic glutamate receptor 5 [mGluR5], excitatory amino acid transporters, and magnetic resonance imaging spectroscopy measurements) of glutamate dysregulation...
2017: Modern Trends in Pharmacopsychiatry
https://www.readbyqxmd.com/read/28738314/factors-associated-with-cognitive-impairment-in-a-cohort-of-older-homeless-adults-results-from-the-hope-home-study
#11
Emily Hurstak, Julene K Johnson, Lina Tieu, David Guzman, Claudia Ponath, Christopher T Lee, Christina Weyer Jamora, Margot Kushel
BACKGROUND: We evaluated cognitive function and factors associated with cognitive impairment in a cohort of older homeless adults. We hypothesized that substance use and a history of traumatic brain injury would be associated with cognitive impairment. METHODS: We recruited 350 homeless individuals aged ≥50 years using population-based sampling and conducted structured interviews and neuropsychological testing. We evaluated alcohol use with the Alcohol Use Disorder Identification Test, defining high-severity alcohol use as a total score ≥16 or ≥4 on the alcohol dependency sub-scale...
July 4, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/28738291/inflammation-responsive-self-regulated-drug-release-from-ultrathin-hydrogel-coating
#12
Min He, Qian Wang, Zhenqiang Shi, Yi Xie, Weifeng Zhao, Changsheng Zhao
Heterotopic ossification(HO) is a potential severe complication after many biomaterial implanting surgeries, and the inflammation environment caused by the implanting-associated infections is considered as the main nosogenesis. Herein, an inflammation-responsive drug release system was designed by chemically conjugating indometacin (via ester group) onto hydrogel coating to realize local self-regulated drug release to prevent HO. In our strategy, poly(3-mercaptopropyl)trimethoxysilane-co-acrylic acrylate and polyvinyl alcohol (providing anchoring sites for drug molecules) were firstly synthesized and functionalized with ene-groups, then a hydrogel layer was formed and covalently attached onto thiol-modified substrate via thiol-ene click chemistry, followed by grafting indometacin...
July 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28738264/evidence-of-anomalous-behavior-of-intermolecular-interactions-at-low-concentration-of-methanol-in-ethanol-methanol-binary-system
#13
K Nilavarasi, Thejus R Kartha, V Madhurima
At low concentrations of methanol in a binary system of ethanol and methanol, uniquely complex molecular interactions are reported here. Previous studies indicate that ethanol molecules form aggregates held together by hydrogen bonding (O-H-O) and also dispersive forces. Addition of small amount of methanol tends to break the hydrogen bond network of ethanol due to the larger polarity of methanol. This leads to the ethanol molecules becoming somewhat isolated from each other within a scaffolding network of methanol molecules, as seen from the present molecular dynamics simulations...
July 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28738213/determinants-of-the-magnitude-of-socioeconomic-inequalities-in-mortality-a-study-of-17-european-countries
#14
Johan P Mackenbach, Matthias Bopp, Patrick Deboosere, Katalin Kovacs, Mall Leinsalu, Pekka Martikainen, Gwenn Menvielle, Enrique Regidor, Rianne de Gelder
The magnitude of socioeconomic inequalities in mortality differs importantly between countries, but these variations have not been satisfactorily explained. We explored the role of behavioral and structural determinants of these variations, by using a dataset covering 17 European countries in the period 1970-2010, and by conducting multilevel multivariate regression analyses. Our results suggest that between-country variations in inequalities in current mortality can partly be understood from variations in inequalities in smoking, excessive alcohol consumption, and poverty...
July 21, 2017: Health & Place
https://www.readbyqxmd.com/read/28738197/tracking-changes-in-composition-and-amount-of-dissolved-organic-matter-throughout-drinking-water-treatment-plants-by-comprehensive-two-dimensional-gas-chromatography-quadrupole-mass-spectrometry
#15
Chunmei Li, Donghong Wang, Xiong Xu, Meijia Xu, Zijian Wang, Ruiyang Xiao
Dissolved organic matter (DOM) can affect the performance of water treatment processes and produce undesirable disinfection by-products during disinfection. Several studies have been undertaken on the structural characterization of DOM, but its fate during drinking water treatment processes is still not fully understood. In this work, the nontargeted screening method of comprehensive two-dimensional gas chromatography-quadrupole mass spectrometry (GC×GC-qMS) was used to reveal the detailed changes of different chemical classes of compounds in DOM during conventional and advanced drinking water treatment processes at three drinking water treatment plants in China...
July 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738057/the-fatty-liver-index-as-a-predictor-of-incident-chronic-kidney-disease-in-a-10-year-prospective-cohort-study
#16
Ji Hye Huh, Jang Young Kim, Eunhee Choi, Jae Seok Kim, Yoosoo Chang, Ki-Chul Sung
BACKGROUND: Although non-alcoholic fatty liver disease (NAFLD) is considered to be associated with chronic kidney disease (CKD), long-term follow up data is lacking. We investigated whether NAFLD, as determined by the fatty liver index (FLI), could predict incident CKD in 10-year prospective cohort study. We also assessed the clinical utility of FLI to predict the development of CKD. METHODS: 6,238 adults aged 40 to 69 years without baseline CKD from the Ansan-Ansung cohort were examined...
2017: PloS One
https://www.readbyqxmd.com/read/28737916/the-conjugated-double-bond-of-coniferyl-aldehyde-is-essential-for-heat-shock-factor-1-mediated-cytotoprotection
#17
Seul-Ki Choi, Gil-Im Mun, Eun Choi, Seo-Young Kim, Youngjoo Kwon, Younghwa Na, Yun-Sil Lee
Coniferyl aldehyde (1) is previously reported as a potent inducer of heat shock factor 1 (HSF1). Here, we further examined the active pharmacophore of 1 for activation of HSF1 using the derivatives coniferyl alcohol (2), 4-hydroxy-3-methoxyphenylpropanal (3), and 4-hydroxy-3-methoxyphenylpropanol (4). Both 1 and 2 resulted in increased survival days after a lethal radiation (IR) dose. The decrease in bone marrow (BM) cellularity and Ki67-positive BM cells by IR was also significantly restored by 1 or 2 in mice...
July 24, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28737815/isofraxidin-a-coumarin-component-improves-high-fat-diet-induced-hepatic-lipid-homeostasis-disorder-and-macrophage-inflammation-in-mice
#18
Jian Li, Xiaofei Li, Zhike Li, Lu Zhang, Yonggang Liu, Hong Ding, Shanye Yin
Isofraxidin (IF) is a coumarin compound produced in the functional foods Siberian ginseng and Apium graveolens. The first objective of this study was to investigate the protective effects and putative methods of IF in combating lipotoxicity in vitro and in vivo. Oleic acid was used to induce lipid turbulence in human hepatoma cells (HepG2). Alterations in triglyceride metabolism, inflammation and oxidative status were monitored. Results show that IF mainly reduced triglyceride accumulation, TNF-α release and ROS activation in metabolic disordered cells...
July 24, 2017: Food & Function
https://www.readbyqxmd.com/read/28737792/ferromagnetic-resonance-of-nicofe2o4-nanoparticles-and-microwave-absorption-properties-of-flexible-nicofe2o4-carbon-black-poly-vinyl-alcohol-composites
#19
Gopal Datt, Chetan Kotabage, A C Abhyankar
The effect of cationic disorder and particle morphology on the ferromagnetic resonance (FMR) of NiCoFe2O4 nanoparticles (NPs) and the electromagnetic shielding effectiveness of flexible composites (wherein the nanoparticles are used as fillers) has been presented. Upon annealing at 1000 °C, spherical, ∼25 nm, single crystalline (as-prepared) NPs are transformed into octahedral, ∼200 nm, polycrystalline (annealed) NPs and change the cationic distribution significantly. The effect of shape, size and cationic distribution on the resonance properties has been discussed using the randomly-oriented anisotropic-axis model...
July 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28737591/hiv-incidence-and-predictors-of-hiv-acquisition-from-an-outside-partner-in-serodiscordant-couples-in-lusaka-zambia-1995-2012
#20
Dvora L Joseph Davey, Kristin M Wall, William Kilembe, Htee Khu Naw, Ilene Brill, Bellington Vwalika, Elwyn Chomba, Joseph Mulenga, Amanda Tichacek, Marjan Javanbakt, Pamina Gorbach, Susan Allen
OBJECTIVE: Evaluate the incidence and predictors of HIV acquisition from outside partners in serodiscordant couples. METHODS: Demographic, behavioral, and clinical exposures were measured quarterly in a cohort of serodiscordant cohabiting couples in Zambia from 1995-2012 (n=3049). Genetic analysis classified incident infections as those acquired from the study partner (linked) or acquired from an outside partner (unlinked). Factors associated with time to unlinked HIV infection were evaluated using multivariable Cox proportional hazards regression stratified by gender...
July 4, 2017: Journal of Acquired Immune Deficiency Syndromes: JAIDS
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