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https://www.readbyqxmd.com/read/29353429/a-sensitive-method-using-spme-pre-concentration-for-the-quantification-of-aromatic-amines-in-indoor-air
#1
Vincent Lucaire, Jean-Jacques Schwartz, Olivier Delhomme, Ruben Ocampo-Torres, Maurice Millet
Monitoring the levels of aliphatic and aromatic amines (AA) in indoor air is important to protect human health because of exposure to these compounds through diet and inhalation. A sampling and analytical method using XAD-2 cartridges and gas chromatography coupled to mass spectrometry used for assessing 25 AA in different smoking and non-smoking indoor environment was developed. After sampling and delivering 1 m3 of air (6-8 h sampling), an adsorbent was ultrasonically extracted with acetonitrile, concentrated to 1 mL and diluted in 25 mL of water (pH = 9; 5% NaCl), and then extracted for 40 min at 80 °C using a divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber and injected in a GC/MS system...
January 20, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29353147/prediction-of-conserved-sites-and-domains-in-glycoproteins-b-c-and-d-of-herpes-viruses
#2
Muhammad Asif Rasheed, Abdur Rahman Ansari, Awais Ihsan, Muhammad Tariq Navid, Shahid Ur-Rehman, Sohail Raza
Glycoprotein B (gB), C (gC) and D (gD) of herpes simplex virus are implicated in virus adsorption and penetration. The gB, gC and gD are glycoproteins for different processes of virus binding and attachment to the host cells. Moreover, their expression is necessary and sufficient to induce cell fusion in the absence of other glycoproteins. Egress of herpes simplex virus (HSV) and other herpes viruses from cells involves extensive modification of cellular membranes and sequential envelopment, de-envelopment and re-envelopment steps...
January 17, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29352928/thermo-sensitive-injectable-glycol-chitosan-based-hydrogel-for-treatment-of-degenerative-disc-disease
#3
Zhengzheng Li, Hyeeun Shim, Myeong Ok Cho, Ik Sung Cho, Jin Hyun Lee, Sun-Woong Kang, Bosun Kwon, Kang Moo Huh
The use of injectable hydrogel formulations have been suggested as a promising strategy for the treatment of degenerative disc disease to both restore the biomechanical function and reduce low back pain. In this work, a new thermo-sensitive injectable hydrogels with tunable thermo-sensitivity and enhanced stability were developed with N-hexanoylation of glycol chitosan (GC) for treatment of degenerative disc disease, and their physico-chemical and biological properties were evaluated. The sol-gel transition temperature of the hydrogels was controlled in a range of 23-56 °С, depending on the degree of hexanoylation and the polymer concentration...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352737/bronchiolitis-obliterans-syndrome-is-associated-with-increased-p-glycoprotein-expression-and-loss-of-glucocorticoid-receptor-from-steroid-resistant-pro-inflammatory-cd8-t-cells
#4
Greg Hodge, Sandra Hodge, Phan Tien Nguyen, Aeneas Yeo, Parama Sarkar, Arash Badiei, C L Holmes-Liew, Paul N Reynolds, Mark Holmes
Immunosuppressive therapy fails to suppress the production of pro-inflammatory cytokines, particularly by CD8+T cells, in stable lung transplant recipients and those undergoing chronic rejection, suggesting that some patients may become relatively resistant to immunosuppressants such as glucocorticoids (GC). We have shown loss of GC receptor (GCR) from the CD8+ cells, and we hypothesized that the drug membrane efflux pump, p-glycoprotein-1 (Pgp), may also be involved in lymphocyte steroid resistance following lung transplant...
January 20, 2018: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/29352581/facile-gas-chromatography-tandem-mass-spectrometry-stable-isotope-dilution-method-for-the-quantification-of-sesquiterpenes-in-grape
#5
Nina Duhamel, Davide Slaghenaufi, Lisa I Pilkington, Mandy Herbst-Johnstone, Roberto Larcher, David Barker, Bruno Fedrizzi
Sesquiterpenes are a widespread class of compounds of increasing interest found in grapes and wines, amongst many other natural sources. Due to a lack of standards and the complexity of the mass spectra fragmentation, accurate quantification of these low concentration compounds had not previously been accomplished. The current paper presents a new method for the concurrent quantification of several sesquiterpenes. The multivariate method optimisation is presented. Synthesised isotopic standards were utilised in conjunction with solid phase microextraction (SPME) and gas chromatography-tandem mass spectrometry (GC-MS/MS) to perform a standard isotope dilution assay (SIDA)...
January 5, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29352348/metarhizium-anisopliae-s-l-modulation-of-lipid-metabolism-during-tick-infection-is-independent-of-ampk-and-erk-pathways
#6
Fillipe A Sá, Caio Junior B Coutinho-Rodrigues, Isabele C Angelo, Jéssica P Fiorotti, Georgia C Atella, Vânia Rita E P Bittencourt, Mário Alberto C Silva-Neto
Despite the importance of fat body in metabolism of arthropods, studies in ticks are scarce. This study evaluated the lipid composition and activation of extracellular signal-regulated protein kinase (ERK) and AMP-activated protein kinase (AMPK) enzymes in Rhipicephalus microplus fat body after infection with different isolates of the fungus Metarhizium anisopliae sensu lato (Metschnikoff, 1879) Sorokin, 1883. The isolates CG 32, GC 112, GC 148, GC 347, and GC 629 were inoculated as viable or non-viable conidia in the ticks...
January 19, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29351874/phenol-preparation-from-catalytic-pyrolysis-of-palm-kernel-shell-at-low-temperatures
#7
Guozhang Chang, Peng Miao, Ximin Yan, Guijin Wang, Qingjie Guo
In the present study, the characteristics of phenol preparation from palm kernel shell (PKS) pyrolysis at the temperature range of 265-320 °C were investigated using TG-FTIR-MS analyses, based on the analysis about the decomposition characteristics of PKS comparing to other biomass samples. The GC-MS analysis was subsequently employed to qualitatively and quantitatively characterize the phenol in bio-oils from PKS catalytic pyrolysis at 265-320 °C. Two significant weight loss peaks with the closer values were observed in DTG curve of PKS that differentiated with other samples, which was mainly attributed to the content and especially the structural characteristics of lignin in the PKS...
December 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29351245/exposure-to-ambient-air-particles-increases-the-risk-of-mental-disorder-findings-from-a-natural-experiment-in-beijing
#8
Zhen Jia, Yongjie Wei, Xiaoqian Li, Lixin Yang, Huijie Liu, Chen Guo, Lulu Zhang, Nannan Li, Shaojuan Guo, Yan Qian, Zhigang Li
Epidemiology studies indicated that air pollution has been associated with adverse neurological effects in human. Moreover, the secretion of glucocorticoid (GC) affects the mood regulation, and the negative feedback of hippocampal glucocorticoid receptors (GR) inhibits the GC secretion. Meanwhile, the over secretion of GC can interfere the immune system and induce neurotoxicity. In the present study, the human test showed that the secretion of the cortisol in plasma was elevated after exposure in heavy air pollution...
January 19, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29351064/molecular-target-analysis-of-stearoyl-coa-desaturase-genes-of-protozoan-parasites
#9
He Lu, Xin Qin, Jing Zhang, Shuang Zhang, Yu Zhu, Wei Hua Wu
Protozoan parasites can synthesize polyunsaturated fatty acids. They possess stearoyl-CoA desaturase to convert stearate into oleate and linoleate. Stearoyl-CoA desaturase are the key enzymes required for the synthesis of unsaturated fatty acids. It seems attractive to evaluate the possibility of using unsaturated fatty acid biosynthesis pathways as drug targets. In this study, the authors investigate codon usage bias, base composition variations and protein sequence in ten available complete stearoyl-CoA desaturase gene sequences from Toxoplasma gondii, Neospora caninum etc...
March 26, 2018: Acta Parasitologica
https://www.readbyqxmd.com/read/29350879/genetic-and-chemical-diversity-in-perovskia-abrotanoides-karel-lamiaceae-populations-based-on-issrs-markers-and-essential-oils-profile
#10
Seyyed Hossein Pourhosseini, Javad Hadian, Ali Sonboli, Samad Nejad Ebrahimi, Mohammad Hossein Mirjalili
Genetic and the essential oil composition variability among twelve Perovskia abrotanoides populations (PAbPs) growing wild in Iran were assessed by ISSR markers, GC-FID and GC-MS, respectively. Nine selected ISSR primers produced 119 discernible bands, of them 96 (80.7%) being polymorphic. Genetic similarity values among populations ranged between 0.07 and 0.79 which indicated a high level of genetic variation. Polymorphic information content, resolving power and marker index generated by ISSR primers were, 0...
January 19, 2018: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/29350665/laparoscopic-gastric-bypass-with-remnant-gastrectomy-in-a-super-super-obese-patient-with-gastric-metaplasia-a-surgical-hazard
#11
Francesco Tartamella, Gabriele Petracca, Andrea Romboli, Federico Marchesi
The endoscopic inaccessibility of the gastric remnant after Roux-en-Y gastric bypass (RYGBP) for morbid obesity represents an important issue for patients with familiar history of gastric cancer (GC) or affected by premalignant lesions, such as intestinal metaplasia. If a different bariatric procedure is contraindicated, RYGBP with remnant gastrectomy represents a reasonable alternative, significantly reducing the risk of GC but potentially increasing postoperative morbidity. For this reason, only few cases have been reported in the recent Literature and none regarding a super-super obese patient...
January 16, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29350497/sensitive-and-rapid-determination-of-pyrethroids-in-human-blood-by-gas-chromatography-tandem-mass-spectrometry-with-ultrasound-assisted-dispersive-liquid-liquid-microextraction
#12
Xue Gao, Hao Guo, Junwei Wang, Qingbiao Zhao
In this study, a sensitive and fast procedure of ultrasonic-assisted dispersive liquid-liquid microextraction (UADLLME) coupled with gas chromatography tandem mass spectrometry (GC-MS/MS) for the determination of major pyrethroid pesticides (permethrin, tetramethrin, bifenthrin, fenvalerate, flucythrinate, fluvalinate, fenpropathrin, deltamethrin and cyhalothrin) in blood samples was developed. Response surface methodology (RSM) combined with Box-Behnken design (BBD) and ANOVA function were used to optimize key factors affecting the extraction efficiency of UADLLME procedure...
January 19, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29350472/the-chemistry-and-pharmacology-of-synthetic-cannabinoid-sdb-006-and-its-regioisomeric-fluorinated-and-methoxylated-analogues
#13
Samuel D Banister, Alexander Olson, Matthew Winchester, Jordyn Stuart, Amelia R Edington, Richard C Kevin, Mitchell Longworth, Marco Herrera, Mark Connor, Iain S McGregor, Roy R Gerona, Michael Kassiou
Synthetic cannabinoids are the largest and most structurally diverse class of new psychoactive substances, with manufacturers often using isomerism to evade detection and circumvent legal restriction. The regioisomeric methoxy- and fluorine-substituted analogues of SDB-006 (N-benzyl-1-pentyl-1H-indole-3-carboxamide) were synthesized and could not be differentiated by gas chromatography-mass spectrometry (GC-MS), but were distinguishable by liquid chromatography-quadrupole time-of-flight-MS (LC-QTOF-MS). In a fluorescence-based plate reader membrane potential assay, SDB-006 acted as a potent agonist at human cannabinoid receptors (CB1 EC50 = 19 nM)...
January 19, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29350312/genesurance-counseling-patient-perspectives
#14
Chelsea Wagner, Lauren Murphy, Jacqueline Harkenrider, Sandra Darilek, Eleazar Soto-Torres, Quinn Stein, Jennifer Hoskovec
Genetic counselors (GCs) have reported an increase in discussion of insurance-related, or "genesurance," topics during genetic counseling sessions. Despite increasing frequency, there have been no studies examining patient expectations of GCs in these discussions. This study aimed to explore patient expectations of GCs in these discussions, as well as examine factors that may impact expectations. A 38-item survey was administered prior to patients receiving prenatal or cancer genetic counseling at 11 clinic sites across UTHealth, Baylor College of Medicine, and Sanford Health, with 360 responses analyzed...
January 19, 2018: Journal of Genetic Counseling
https://www.readbyqxmd.com/read/29349614/treatment-and-outcomes-of-28-patients-with-spinal-metastasis-from-gynecological-cancer
#15
Xin Gao, Chenglong Zhao, Shaohui He, Tianqi Fan, Wei Xu, Cheng Yang, Tielong Liu, Jianru Xiao
The aim of this study was to provide some useful information concerning clinical characteristics, surgical treatment, potential contributing factor and prognostic factors for patients with gynecological cancer (GC) spinal metastasis. We reviewed 28 patients with GC spinal metastasis in our spine tumor center between July 2008 and July 2015. Surgeries were performed on 22 of them. Univariate and multivariate analyses were conducted to identify potential prognostic factors affecting spinal metastasis-free survival (SMFS) and overall survival...
January 18, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29349441/association-between-sn-2-fatty-acid-profiles-of-breast-milk-and-development-of-the-infant-intestinal-microbiome
#16
Tiemin Jiang, Bin Liu, Jufang Li, Xueyan Dong, Man Lin, Minghui Zhang, Junying Zhao, Yaohua Dai, Lijun Chen
Increasing evidence shows that host diet and gut microbes are related. Previous studies have shown the effects of specific dietary fatty acids (FAs) on intestinal microbiota, but little is known about the effect of the stereospecifically numbered sn-2 position in triglycerides (TG) of human milk on the gut microbiome of infants. This study aimed at examining possible effects of sn-2 FAs of human milk on the gut microbial development of breastfeeding babies. Sn-2 FAs and intestinal microbiota were assessed by GC-MS and high-throughput 16S rRNA sequencing, respectively...
January 19, 2018: Food & Function
https://www.readbyqxmd.com/read/29348723/metabolite-profiling-of-fermented-ginseng-extracts-by-gas-chromatography-mass-spectrometry
#17
Seong-Eun Park, Seung-Ho Seo, Kyoung In Lee, Chang-Su Na, Hong-Seok Son
Background: Ginseng contains many small metabolites such as amino acids, fatty acids, carbohydrates, and ginsenosides. However, little is known about the relationships between microorganisms and metabolites during the entire ginseng fermentation process. We investigated metabolic changes during ginseng fermentation according to the inoculation of food-compatible microorganisms. Methods: Gas chromatography mass spectrometry (GC-MS) datasets coupled with the multivariate statistical method for the purpose of latent-information extraction and sample classification were used for the evaluation of ginseng fermentation...
January 2018: Journal of Ginseng Research
https://www.readbyqxmd.com/read/29348665/pcdhga9-acts-as-a-tumor-suppressor-to-induce-tumor-cell-apoptosis-and-autophagy-and-inhibit-the-emt-process-in-human-gastric-cancer
#18
Junyong Weng, Jingbo Xiao, Yushuai Mi, Xu Fang, Yahuang Sun, Shanbao Li, Zhiwei Qin, Xu Li, Tingting Liu, Senlin Zhao, Lisheng Zhou, Yugang Wen
The results of a cDNA  array revealed that protocadherin gamma subfamily A, 9 (PCDHGA9) was significantly decreased in SGC-7901 gastric cancer (GC) cells compared with GES-1 normal gastric cells and was strongly associated with the Wnt/β-catenin and transforming growth factor-β (TGF-β)/Smad2/3 signaling pathway. As a member of the cadherin family, PCDHGA9 functions in both cell-cell adhesion and nuclear signaling. However, its role in tumorigenicity or metastasis has not been reported. In the present study, we found that PCDHGA9 was decreased in GC tissues compared with corresponding normal mucosae and its expression was correlated with the GC TNM stage, the UICC stage, differentiation, relapse, and metastasis (p < 0...
January 18, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29348496/natriuretic-peptides-promote-glucose-uptake-in-a-cgmp-dependent-manner-in-human-adipocytes
#19
Marine Coué, Valentin Barquissau, Pauline Morigny, Katie Louche, Corinne Lefort, Aline Mairal, Christian Carpéné, Nathalie Viguerie, Peter Arner, Dominique Langin, Mikael Rydén, Cedric Moro
Robust associations between low plasma level of natriuretic peptides (NP) and increased risk of type 2 diabetes (T2D) have been recently reported in humans. Adipose tissue (AT) is a known target of NP. However it is unknown whether NP signalling in human AT relates to insulin sensitivity and modulates glucose metabolism. We here show in two European cohorts that the NP receptor guanylyl cyclase-A (GC-A) expression in subcutaneous AT was down-regulated as a function of obesity grade while adipose NP clearance receptor (NPRC) was up-regulated...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29348358/complete-genome-sequence-of-kyrpidia-sp-strain-ea-1-a-thermophilic-knallgas-bacterium-isolated-from-the-azores
#20
Johannes Eberhard Reiner, Christian Jonas Lapp, Boyke Bunk, Cathrin Spröer, Jörg Overmann, Johannes Gescher
Kyrpidia sp. strain EA-1 is a thermophilic hydrogen-oxidizing bacterium isolated from hydrothermal systems at São Miguel Island, Portugal. Here, we present the complete genome sequence of the strain assembled to a single circular chromosome. The genome spans 3,352,175 bp, with a GC content of 58.7%.
January 18, 2018: Genome Announcements
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