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https://www.readbyqxmd.com/read/28420528/two-dimensional-gas-chromatography-with-electron-capture-detection-for-the-analysis-of-atmospheric-ozone-depleting-halocarbons
#1
Chang-Feng Ou-Yang, Hsi-Che Hua, Yu-Chieh Chou, Ming-Kai Teng, Wen-Tzu Liu, Jia-Lin Wang
This study is to develop a GC×GC method with electron capture detection (ECD) to analyze atmospheric halocarbons in the concentration range of parts per trillion by volume (pptv). To enrich atmospheric halocarbons a home-built thermal desorption (TD) device was coupled to the GC×GC-ECD. The technique of flow modulation was adopted using a Deans switch for GC×GC. Several column combinations of first and second dimensions were tested and the column set of DB-5×TG-1301 was found to show the best orthogonality for halocarbons...
April 4, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28273818/svm-based-spectral-analysis-for-heart-rate-from-multi-channel-wppg-sensor-signals
#2
Jiping Xiong, Lisang Cai, Fei Wang, Xiaowei He
Although wrist-type photoplethysmographic (hereafter referred to as WPPG) sensor signals can measure heart rate quite conveniently, the subjects' hand movements can cause strong motion artifacts, and then the motion artifacts will heavily contaminate WPPG signals. Hence, it is challenging for us to accurately estimate heart rate from WPPG signals during intense physical activities. The WWPG method has attracted more attention thanks to the popularity of wrist-worn wearable devices. In this paper, a mixed approach called Mix-SVM is proposed, it can use multi-channel WPPG sensor signals and simultaneous acceleration signals to measurement heart rate...
March 3, 2017: Sensors
https://www.readbyqxmd.com/read/28239748/%C3%AE-synuclein-s-uniquely-long-amphipathic-helix-enhances-its-membrane-binding-and-remodeling-capacity
#3
Anthony R Braun, Michael M Lacy, Vanessa C Ducas, Elizabeth Rhoades, Jonathan N Sachs
α-Synuclein is the primary protein found in Lewy bodies, the protein and lipid aggregates associated with Parkinson's disease and Lewy body dementia. The protein folds into a uniquely long amphipathic α-helix (AH) when bound to a membrane, and at high enough concentrations, it induces large-scale remodeling of membranes (tubulation and vesiculation). By engineering a less hydrophobic variant of α-Synuclein, we previously showed that the energy associated with binding of α-Synuclein's AH correlates with the extent of membrane remodeling (Braun et al...
April 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28174080/extraction-and-characterization-of-gelatin-from-the-feet-of-pekin-duck-anas-platyrhynchos-domestica-as-affected-by-acid-alkaline-and-enzyme-pretreatment
#4
Ahmadreza Abedinia, Fazilah Ariffin, Nurul Huda, Abdorreza Mohammadi Nafchi
The effects of different pretreatments on yield and composition of extraction, physicochemical, and rheological properties of duck feet gelatin (DFG) were investigated. Gelatins were extracted from the whole feet of Pekin duck with an average yield of 4.09%, 3.65%, and 5.75% for acidic (Ac-DFG), alkaline (Al-DFG), and enzymatic (En-DFG) pretreatment on a wet weight basis, respectively. Proteins at 81.38%, 79.41%, 82.55%, and 87.38% were the major composition for Ac-DFG, Al-DFG, En-DFG, and bovine, respectively...
May 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28155049/the-relationship-between-sf-6d-utility-scores-and-lifestyle-factors-across-three-life-stages-evidence-from-the-australian-longitudinal-study-on-women-s-health
#5
Jeeva Kanesarajah, Michael Waller, Jennifer A Whitty, Gita D Mishra
PURPOSE: To investigate how SF-6D utility scores change with age between generations of women and to quantify the relationship of SF-6D with lifestyle factors across life stages. METHODS: Up to seven waves of self-reported, longitudinal data were drawn for the 1973-1978 (young, N = 13772), 1946-1951 (mid-age, N = 12792), 1921-1926 (older, N = 9972) cohorts from the Australian Longitudinal Study on Women's Health. Mixed effects models were employed for analysis...
February 3, 2017: Quality of Life Research
https://www.readbyqxmd.com/read/27670785/infrared-emitting-peptidase-resistant-fluorescent-ligands-of-the-bradykinin-b2-receptor-application-to-cytofluorometry-and-imaging
#6
Lajos Gera, Xavier Charest-Morin, Melissa Jean, Hélène Bachelard, François Marceau
BACKGROUND: We have previously reported the design, pharmacological properties and imaging application of bradykinin (BK) B2 receptor (B2R) ligands conjugated with fluorophores such as fluorescein derivatives at their N-terminus. To take advantage of the high penetration of infrared light into living tissues and their low autofluorescence in this region of the spectrum, additional probes conjugated with cyanine dye 7 (Cy7) were synthesized and characterized. RESULTS: The antagonist B-9430 (D-Arg-[Hyp(3),Igl(5),D-Igl(7),Oic(8)]-BK) and the agonist B-9972 (D-Arg-[Hyp(3),Igl(5),Oic(7),Igl(8)]-BK) were N-terminally extended with the infrared fluorophore Cy7, producing the peptides B-10665 and B-10666, respectively...
September 26, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27497338/analysis-of-12-x-chromosomal-markers-in-the-population-of-central-croatia
#7
Josip Crnjac, Petar Ozretić, Siniša Merkaš, Martina Ratko, Mateja Lozančić, Sara Rožić, Daniel Špoljarić, Marina Korolija, Maja Popović, Gordan Mršić
Investigator® Argus X-12 Kit is a commercially available set that allows simultaneous PCR amplification of 12 X-STR markers belonging to four linkage groups (LG). To assess the forensic efficiency of these markers for the population of central Croatia and consequent applicability in routine forensic casework, DNA from 200 blood samples of unrelated donors (100 female and 100 male) was amplified by Investigator® Argus X-12 Kit and analyzed by capillary electrophoresis. Statistical computations based on allele and haplotype frequencies for LG1 - LG4 were performed using Arlequin 3...
July 2016: Legal Medicine
https://www.readbyqxmd.com/read/27452167/sequential-optimization-methods-for-augmentation-of-marine-enzymes-production-in-solid-state-fermentation-l-glutaminase-production-a-case-study
#8
REVIEW
T Sathish, K B Uppuluri, P Veera Bramha Chari, D Kezia
There is an increased l-glutaminase market worldwide due to its relevant industrial applications. Salt tolerance l-glutaminases play a vital role in the increase of flavor of different types of foods like soya sauce and tofu. This chapter is presenting the economically viable l-glutaminases production in solid-state fermentation (SSF) by Aspergillus flavus MTCC 9972 as a case study. The enzyme production was improved following a three step optimization process. Initially mixture design (MD) (augmented simplex lattice design) was employed to optimize the solid substrate mixture...
2016: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/27409710/association-of-loss-of-independence-with-readmission-and-death-after-discharge-in-older-patients-after-surgical-procedures
#9
Julia R Berian, Sanjay Mohanty, Clifford Y Ko, Ronnie A Rosenthal, Thomas N Robinson
IMPORTANCE: Older adults are at increased risk for adverse events after surgical procedures. Loss of independence (LOI), defined as a decline in function or mobility, increased care needs at home, or discharge to a nonhome destination, is an important patient-centered outcome measure. OBJECTIVE: To evaluate LOI among older adult patients after surgical procedures and examine the association of LOI with readmission and death after discharge in this population. DESIGN, SETTING, AND PARTICIPANTS: This retrospective cohort study examined 9972 patients 65 years and older with known baseline function, mobility, and living situation undergoing inpatient operations from January 2014 to December 2014 at 26 hospitals participating in the American College of Surgeons National Surgical Quality Improvement Program Geriatric Surgery Pilot Project...
September 21, 2016: JAMA Surgery
https://www.readbyqxmd.com/read/27355258/survival-of-ovarian-cancer-patients-in-denmark-results-from-the-danish-gynaecological-cancer-group-dgcg-database-1995-2012
#10
Hellen McKinnon Edwards, Mette Calundann Noer, Cecilie Dyg Sperling, Mary Nguyen-Nielsen, Lene Lundvall, Ib Jarle Christensen, Claus Høgdall
BACKGROUND: Ovarian cancer has a high mortality rate, especially in Denmark where mortality rates have been reported higher than in adjacent countries with similar demographics. This study therefore examined recent survival and mortality among Danish ovarian cancer patients over an 18-year study period. METHODS: This nationwide registry-based observational study used data from the Danish Gynecology Cancer Database, Danish Pathology Registry, and Danish National Patient Registry...
June 2016: Acta Oncologica
https://www.readbyqxmd.com/read/27150752/sonochemical-assisted-hydrothermal-synthesis-of-zno-cr-nanoparticles-loaded-activated-carbon-for-simultaneous-ultrasound-assisted-adsorption-of-ternary-toxic-organic-dye-derivative-spectrophotometric-optimization-kinetic-and-isotherm-study
#11
M Jamshidi, M Ghaedi, K Dashtian, S Hajati, A A Bazrafshan
Chromium doped zinc oxide nanoparticles (ZnO: Cr-NPs) was synthesized by ultrasonically assisted hydrothermal method and characterized by FE-SEM, XRD and TEM analysis. Subsequently, this composite ultrasonically assisted was deposited on activated carbon (ZnO: Cr-NPs-AC) and used for simultaneous ultrasound-assisted removal of three toxic organic dye namely of malachite green (MG), eosin yellow (EY) and Auramine O (AO). Dyes spectra overlap in mixture (major problem for simultaneous investigation) of this systems was extensively resolved by derivative spectrophotometric method...
September 2016: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27109197/preparation-of-size-controlled-magnetite-nanoparticles-with-a-graphene-and-polymeric-ionic-liquid-coating-for-the-quick-easy-cheap-effective-rugged-and-safe-extraction-of-preservatives-from-vegetables
#12
Yaling Chen, Shurui Cao, Lei Zhang, Cunxian Xi, Xianliang Li, Zhiqiong Chen, Guoming Wang
Size-controlled magnetite nanoparticles (Fe3O4) with 200-1000nm were synthesized by co-precipitation method. Then Fe3O4@SiO2@G@PIL was synthesized and used as modified QuEChERS adsorbent for the determination of preservatives in vegetables. The size of about 200nm of Fe3O4 in Fe3O4@SiO2@G@PIL was selected as optimum size to clean-up. It not only exerted the nanometer features of magnetic nanoparticles, but also displayed the large specific surface area of graphene (G) and the solvent effects of polymeric ionic liquids (PILs)...
May 27, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27086999/self-assembled-templates-of-aromatic-pentapeptides-for-synthesis-of-cds-quantum-dots-to-detect-the-trace-amounts-of-hg-2-in-aqueous-solutions
#13
Min Meng, Yingying Dou, Wenlong Xu, Jingcheng Hao
Molecular self-assembly has become a popular tool to prepare nanomaterials with potential applications, such as ion-responsive detection of Hg(2+) in aqueous solutions. In this study, FFACD aromatic pentapeptides, whose N-terminuses were protected by carboxyl (Ac-FFACD) or a 9-fluorenylmethoxycarbonyl group (Fmoc-FFACD), were chosen as building blocks to produce nanostructures in solutions. Based on the preliminary determination of the critical aggregation concentration (CAC) of Ac-FFACD and Fmoc-FFACD aromatic pentapeptides in water, the order of magnitude of which is 10(-5) mol·L(-1), self-assembled spiral and networked nanowires can be easily obtained over a range of concentrations...
May 1, 2016: Journal of Oleo Science
https://www.readbyqxmd.com/read/26672283/-comparison-of-three-spectroscopies-for-the-determination-of-composition-of-ldpe-pp-blend-with-partial-least-squares
#14
Ru-huang Chen, Gang Jin
This paper presented an application of mid-infrared (MIR), near-infrared (NIR) and Raman spectroscopies for collecting the spectra of 31 kinds of low density polyethylene/polyprolene (LDPE/PP) samples with different proportions. The different pre-processing methods (multiplicative scatter correction, mean centering and Savitzky-Golay first derivative) and spectral region were explored to develop partial least-squares (PLS) model for LDPE, their influence on the accuracy of PLS model also being discussed. Three spectroscopies were compared about the accuracy of quantitative measurement...
August 2015: Guang Pu Xue Yu Guang Pu Fen Xi, Guang Pu
https://www.readbyqxmd.com/read/26553711/a-novel-method-to-quantify-the-emission-and-conversion-of-vocs-in-the-smoking-of-electronic-cigarettes
#15
Yong-Hyun Kim, Ki-Hyun Kim
An analytical technique was developed for the quantitation of volatile organic compounds (VOC) in three different forms of electronic cigarette (EC): solution, vapor, and aerosol. Through the application of the mass change tracking (MCT) approach, the consumed amount of the solution was measured to track the conversion of targets between the different phases. The concentration of aerosol plus vapor (A&V) decreased exponentially (559 to 129 g m(-3)) with increasing puff velocity (0.05 to 1 L min(-1)). A strong correlation existed between sampling volume and consumed solution mass (R(2) = 0...
2015: Scientific Reports
https://www.readbyqxmd.com/read/26470107/gamma-irradiation-as-a-phytosanitary-treatment-of-bactrocera-tau-diptera-tephritidae-in-pumpkin-fruits
#16
Zhan Guoping, Ren Lili, Shao Ying, Wang Qiaoling, Yu Daojian, Wang Yuejin, Li Tianxiu
The fruit fly Bactrocera tau (Walker) is an important quarantine pest that damages fruits and vegetables throughout Asian regions. Host commodities shipped from infested areas should undergo phytosanitary measures to reduce the risk of shipping viable flies. The dose-response tests with 1-d-old eggs and 3-, 5-, 7-, 8-d-old larvae were initiated to determine the most resistant stages in fruits, and the minimum dose for 99.9968% prevention of adult eclosion at 95% confidence level was validated in the confirmatory tests...
February 2015: Journal of Economic Entomology
https://www.readbyqxmd.com/read/26370108/htert-promotes-the-invasion-of-gastric-cancer-cells-by-enhancing-foxo3a-ubiquitination-and-subsequent-itgb1-upregulation
#17
Changjiang Hu, Zhenghong Ni, Bo-Sheng Li, Xin Yong, Xin Yang, Jian-Wei Zhang, Dan Zhang, Yong Qin, Meng-Meng Jie, Hui Dong, Song Li, Fengtian He, Shi-Ming Yang
BACKGROUND AND AIMS: Human telomerase reverse transcriptase (hTERT) plays an important role in cancer invasion, but the relevant mechanism is not well known. This study aims to investigate the role and mechanism of hTERT in gastric cancer metastasis. DESIGN: Proteomics analysis, qPCR and western blotting were used to screen for hTERT-regulated candidate molecules in gastric cancer invasion. Chromatin immunoprecipitation (ChIP) qPCR was performed to identify the binding sites of hTERT at the regulatory region of the integrin β1 (ITGB1) gene...
January 2017: Gut
https://www.readbyqxmd.com/read/26314790/radiotherapy-after-mastectomy-for-screen-detected-ductal-carcinoma-in-situ
#18
K Clements, D Dodwell, G Lawrence, G Ball, A Francis, S Pinder, E Sawyer, M Wallis, A M Thompson
BACKGROUND: A role for radiotherapy after mastectomy for ductal carcinoma in situ (DCIS) is unclear. Using a prospective audit of DCIS detected through the NHS Breast Screening Programme we sought to determine a rationale for the use of post mastectomy radiotherapy for DCIS. METHODS: Over a nine year period, from 9972 patients with screen-detected DCIS and complete surgical, pathology, radiotherapy and follow up data, 2944 women underwent mastectomy for DCIS of whom 33 (1...
October 2015: European Journal of Surgical Oncology
https://www.readbyqxmd.com/read/26193833/characterization-and-assessment-of-contaminated-soil-and-groundwater-at-an-organic-chemical-plant-site-in-chongqing-southwest-china
#19
Geng Liu, Junjie Niu, Chao Zhang, Guanlin Guo
Contamination from organic chemical plants can cause serious pollution of soil and groundwater ecosystems. To characterize soil contamination and to evaluate the health risk posed by groundwater at a typical organic chemical plant site in Chongqing, China, 91 soil samples and seven groundwater samples were collected. The concentrations of different contaminants and their three-dimensional distribution were determined based on the 3D-krige method. Groundwater chemistry risk index (Chem RI) and cancer risk were calculated based on TRIAD and RBCA models...
April 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/26178177/multidetector-computed-tomography-for-detecting-left-atrial-left-atrial-appendage-thrombus-a-meta-analysis
#20
REVIEW
H Zou, Y Zhang, J Tong, Z Liu
BACKGROUND: The diagnostic accuracy of multidetector computed tomography (MDCT) in the detection of left atrial/left atrial appendage (LA/LAA) thrombus had been tested in many studies; however, the results are controversial. AIM: The aim of the present study was to evaluate synthetically the diagnostic accuracy of MDCT in LA/LAA thrombus. METHODS: PubMed and Embase were searched for published prospective studies which compared computed tomography with transoesophageal echocardiography (TEE) in detecting LA/LAA thrombus prior to March 2014...
October 2015: Internal Medicine Journal
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