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https://www.readbyqxmd.com/read/29027422/-continual-improvement-of-quantitative-analytical-method-development-of-panax-notogineng-saponins-based-on-quality-by-design
#1
Sheng-Yun Dai, Bing Xu, Xin-Yuan Shi, Xiang Xu, Ying-Qiang Sun, Yan-Jiang Qiao
This study is aimed to propose a continual improvement strategy based on quality by design (QbD). An ultra high performance liquid chromatography (UPLC) method was developed to accomplish the method transformation from HPLC to UPLC of Panax notogineng saponins (PNS) and achieve the continual improvement of PNS based on QbD, for example. Plackett-Burman screening design and Box-Behnken optimization design were employed to further understand the relationship between the critical method parameters (CMPs) and critical method attributes (CMAs)...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28974742/the-relative-contribution-of-metabolic-and-structural-abnormalities-to-diastolic-dysfunction-in-obesity
#2
J J Rayner, R Banerjee, C J Holloway, A J M Lewis, M A Peterzan, J M Francis, S Neubauer, O J Rider
BACKGROUND: Obesity causes diastolic dysfunction, and is one of the leading causes of heart failure with preserved ejection fraction. Myocardial relaxation is determined by both active metabolic processes such as impaired energetic status and steatosis, as well as intrinsic myocardial remodelling. However, the relative contribution of each to diastolic dysfunction in obesity is currently unknown. METHODS: 80 adult subjects (48 male) with no cardiovascular risk factors across a wide range of body mass indices (18...
October 4, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28962776/effect-of-molecular-weight-of-starch-on-the-properties-of-cassava-starch-microspheres-prepared-in-aqueous-two-phase-system
#3
Huiping Xia, Bing-Zheng Li, Qunyu Gao
Starch microspheres (SMs) were fabricated in an aqueous two-phase system (ATPS). A series of starch samples with different molecular weight were prepared by acid hydrolysis, and the effect of molecular weight of starch on the fabrication of SMs were investigated. Scanning electron microscopy (SEM) showed that the morphologies of SMs varied with starch molecular weight, and spherical SMs with sharp contours were obtained while using starch samples with weight-average molecular weight (M¯w)≤1.057×10(5)g/mol...
December 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28959036/general-anesthetics-regulate-autophagy-via-modulating-the-inositol-1-4-5-trisphosphate-receptor-implications-for-dual-effects-of-cytoprotection-and-cytotoxicity
#4
Gongyi Ren, Yachun Zhou, Ge Liang, Bin Yang, Meirong Yang, Alexander King, Huafeng Wei
General anesthetics are both neuroprotective and neurotoxic with unclear mechanisms. General anesthetics may control cell survival via their effects on autophagy by activation of type 1 inositol triphosphate receptor (InsP3R-1). DT40 or SH-SY5Y cells with only or over 99% expression of InsP3R-1 were treated with isoflurane or propofol. Cell viability was determined by MTT reduction or LDH release assays. Apoptosis was determined by measuring Caspase-3 or by TUNEL assay. Autophagy activity was determined by measuring LC3 II and P62...
September 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28949271/pressure-passivity-of-cerebral-mitochondrial-metabolism-is-associated-with-poor-outcome-following-perinatal-hypoxic-ischemic-brain-injury
#5
Subhabrata Mitra, Gemma Bale, David Highton, Roxanna Gunny, Cristina Uria-Avellanal, Alan Bainbridge, Magdalena Sokolska, David Price, Angela Huertas-Ceballos, Giles S Kendall, Judith Meek, Ilias Tachtsidis, Nicola J Robertson
Hypoxic ischemic encephalopathy (HIE) leads to significant morbidity and mortality. Impaired autoregulation after hypoxia-ischaemia has been suggested to contribute further to injury. Thalamic lactate/N-Acetylasperate (Lac/NAA) peak area ratio of > 0.3 on proton ((1)H) magnetic resonance spectroscopy (MRS) is associated with poor neurodevelopment outcome following HIE. Cytochrome-c-oxidase (CCO) plays a central role in mitochondrial oxidative metabolism and ATP synthesis. Using a novel broadband NIRS system, we investigated the impact of pressure passivity of cerebral metabolism (CCO), oxygenation (haemoglobin difference (HbD)) and cerebral blood volume (total haemoglobin (HbT)) in 23 term infants following HIE during therapeutic hypothermia (HT)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28946905/metabolic-adjustment-upon-repetitive-substrate-perturbations-using-dynamic-13-c-tracing-in-yeast
#6
C A Suarez-Mendez, C Ras, S A Wahl
BACKGROUND: Natural and industrial environments are dynamic with respect to substrate availability and other conditions like temperature and pH. Especially, metabolism is strongly affected by changes in the extracellular space. Here we study the dynamic flux of central carbon metabolism and storage carbohydrate metabolism under dynamic feast/famine conditions in Saccharomyces cerevisiae. RESULTS: The metabolic flux reacts fast and sensitive to cyclic perturbations in substrate availability...
September 25, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28924314/comparison-between-standing-broad-jump-test-and-wingate-test-for-assessing-lower-limb-anaerobic-power-in-elite-sportsmen
#7
Anup Krishnan, Deep Sharma, Madhu Bhatt, Apoorv Dixit, P Pradeep
BACKGROUND: Lower limb explosive power is an important motor quality for sporting performance and indicates use of anaerobic energy systems like stored ATP and Creatine phosphate system. Weightlifting, Fencing and Wrestling use it for monitoring and identification of potential sportsmen. The Wingate test and Standing Broad Jump (SBJ) test are reliable and accurate tests for its assessment. This study conducted on elite Indian sportsmen tries to analyse feasibility of use of the SBJ test in sports and military medicine when Wingate test is impractical...
April 2017: Medical Journal, Armed Forces India
https://www.readbyqxmd.com/read/28869546/energy-efficient-optimal-power-allocation-in-integrated-wireless-sensor-and-cognitive-satellite-terrestrial-networks
#8
Shengchao Shi, Guangxia Li, Kang An, Bin Gao, Gan Zheng
This paper proposes novel satellite-based wireless sensor networks (WSNs), which integrate the WSN with the cognitive satellite terrestrial network. Having the ability to provide seamless network access and alleviate the spectrum scarcity, cognitive satellite terrestrial networks are considered as a promising candidate for future wireless networks with emerging requirements of ubiquitous broadband applications and increasing demand for spectral resources. With the emerging environmental and energy cost concerns in communication systems, explicit concerns on energy efficient resource allocation in satellite networks have also recently received considerable attention...
September 4, 2017: Sensors
https://www.readbyqxmd.com/read/28858994/high-plasma-concentrations-of-dolutegravir-in-patients-with-abcg2-genetic-variants
#9
Kiyoto Tsuchiya, Tsunefusa Hayashida, Akinobu Hamada, Sakurako Oki, Shinichi Oka, Hiroyuki Gatanaga
The ATP-binding cassette transporters B1 (ABCB1) and G2 (ABCG2) are both expressed in the intestine and known as efflux transporters of drugs. Dolutegravir was identified recently as a substrate of both ABCB1 and ABCG2. This study aimed to determine the relations between single-nucleotide polymorphisms of ABCB1 and ABCG2 genes and plasma dolutegravir concentrations. Plasma samples were obtained from 42 HIV-1-infected patients treated with dolutegravir-containing regimens 0.5-4 h after dolutegravir dosing...
November 2017: Pharmacogenetics and Genomics
https://www.readbyqxmd.com/read/28843934/ag-4-atp-mwcnt-electrode-modified-with-dsdna-as-label-free-electrochemical-sensor-for-the-detection-of-daunorubicin-anticancer-drug
#10
Asma Saljooqi, Tayebeh Shamspur, Ali Mostafavi
This paper describes the synthesis of Ag-4-ATP-MWCNT nanocomposite and its use as a modifier of working electrode. The surface of the electrochemical Ag-4-ATP-MWCNT electrode was modified with a double-stranded DNA (dsDNA) to detect daunorubicin-DNA interactions. Differential pulse voltammetry was applied to develop an electroanalytical procedure for the determination of daunorubicin and evaluate its interaction with dsDNA immobilized on the electrode surface. After the optimization of operational parameters, the linear dependence of the peak current on the daunorubicin concentration was observed in the range of 0...
December 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28820983/a-sensitive-method-for-the-separation-and-quantification-of-low-level-adenine-nucleotides-using-porous-graphitic-carbon-based-liquid-chromatography-and-tandem-mass-spectrometry
#11
Sonia Bustamante, Robert B Gilchrist, Dulama Richani
A liquid chromatography coupled to heated electrospray ionization/tandem mass spectrometry (LC-HESI-MS/MS) method was developed for the simultaneous quantitative analysis of low nanomolar level adenine nucleotides AMP, ADP, ATP, cyclic AMP (cAMP), and the nucleoside adenosine. For analyte retention and separation, reverse phase chromatography using porous graphitic carbon (PGC) was employed as it provided full resolution. The erratic chromatographic behaviour characteristic of PGC, including deterioration of analyte resolution and increased peak tailing (leading to decreased sensitivity), was mitigated by incorporating acidic equilibration within runs using a quaternary gradient...
September 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28793908/transcriptomic-analysis-comparing-mouse-strains-with-extreme-total-lung-capacities-identifies-novel-candidate-genes-for-pulmonary-function
#12
Leema George, Ankita Mitra, Tania A Thimraj, Martin Irmler, Sangeetha Vishweswaraiah, Lars Lunding, Dorothea Hühn, Alicia Madurga, Johannes Beckers, Heinz Fehrenbach, Swapna Upadhyay, Holger Schulz, George D Leikauf, Koustav Ganguly
BACKGROUND: Failure to attain peak lung function by early adulthood is a risk factor for chronic lung diseases. Previously, we reported that C3H/HeJ mice have about twice total lung capacity (TLC) compared to JF1/MsJ mice. We identified seven lung function quantitative trait loci (QTL: Lfnq1-Lfnq7) in backcross/intercross mice derived from these inbred strains. We further demonstrated, superoxide dismutase 3, extracellular (Sod3), Kit oncogene (Kit) and secreted phosphoprotein 1 (Spp1) located on these Lfnqs as lung function determinants...
August 9, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28780839/-feasibility-and-value-of-index-of-microcirculatory-resistance-in-patients-with-acute-myocardial-infarction-after-primary-percutaneous-coronary-intervention
#13
J L Han, L Y He, M Cui, Y Z Zhang, X B Liu, X Y Xu, Y P Wang, F F Wang, G S Wang, J Niu, F C Zhang, L Mi, L J Guo, W Gao
Objective: To evaluate the feasibility of detecting index of microcirculatory resistance (IMR) and the relationship between IMR and left ventricular (LV) systolic function after acute myocardial infarction (AMI) undergoing primary percutaneous coronary intervention (PCI). Methods: The patients with first AMI received primary PCI in Peking University Third Hospital were enrolled from January 2014 to March 2016. IMR were measured immediately after PCI by using pressure/temperature wire. The relationship between IMR and left ventricular ejection fraction (LVEF) assessed by echocardiography at first day and 6 months after admission was evaluated...
August 1, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28776675/dissociating-external-power-from-intramuscular-exercise-intensity-during-intermittent-bilateral-knee-extension-in-humans
#14
Matthew J Davies, Alan P Benson, Daniel T Cannon, Simon Marwood, Graham J Kemp, Harry B Rossiter, Carrie Ferguson
Compared with work-matched high-intensity continuous exercise, intermittent exercise dissociates pulmonary oxygen uptake (V̇O2 ) from the accumulated work. The extent to which this reflects differences in O2 storage fluctuations and/or contributions from oxidative and substrate-level bioenergetics is unknown. Using pulmonary gas-exchange and intramuscular (31) P magnetic resonance spectroscopy, we tested the hypotheses that at the same power: ATP synthesis rates are similar; but peak V̇O2 amplitude is lower in intermittent vs...
August 4, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28770830/resveratrol-alleviates-diabetic-cardiomyopathy-in-rats-by-improving-mitochondrial-function-through-pgc-1%C3%AE-deacetylation
#15
Wei-Jin Fang, Chun-Jiang Wang, Yang He, Yu-Lu Zhou, Xiang-Dong Peng, Shi-Kun Liu
Recent evidence shows that resveratrol (RSV) may ameliorate high-glucose-induced cardiac oxidative stress, mitochondrial dysfunction and myocardial fibrosis in diabetes. However, the mechanisms by which RSV regu¬lates mitochondrial function in diabetic cardiomyopathy have not been fully elucidated. Mitochondrial dysfunction contributes to cardiac dysfunction in diabetic patients, which is associated with dysregulation of peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α). In this study we examined whether resveratrol alleviated cardiac dysfunction in diabetes by improving mitochondrial function via SIRT1-mediated PGC-1α deacetylation...
August 3, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28732888/separation-of-polysaccharides-from-spirulina-platensis-by-hsccc-with-ethanol-ammonium-sulfate-atps-and-their-antioxidant-activities
#16
Xueyan Wu, Ruichang Li, Yongjie Zhao, Yang Liu
Three separation methods for water-soluble polysaccharides from Spirulina platensis (PSP) were compared, including sevage deproteinization and column chromatography, ethanol-ammonium sulfate aqueous two-phase system (ATPS) and column chromatography, and one-step high speed counter-current chromatography (HSCCC) with ethanol-ammonium sulfate ATPS. ATPS was confirmed as an efficient alternative method of protein removal for PSP purification. For the HSCCC with ethanol-ammonium sulfate ATPS, the stationary retention reached to 50...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28715120/characterization-of-a-multiple-particle-delivery-complex-and-determination-of-cellular-photodamage-in-skin-fibroblast-and-breast-cancer-cell-lines
#17
Ivan Mfouo-Tynga, Nicolette N Houreld, Heidi Abrahamse
Zinc metallized Phthalocyanine (ZnPcSmix ), a potent photosensitizer, is conjugated to gold dendrimer encapsulated nanoparticles (AuDENPs) in order to improve the efficacy of photodynamic therapy (PDT) using MCF-7 breast cancer cells and WS1 fibroblast cells as a control. Both ZnPcSmix and AuDENPs are mixed in a nitrogen atmosphere for 48 hours and characterization analysis conducted using ultraviolet-visible (UV-vis) spectrometry for spectral properties, transmission electron microscopy (TEM) for morphological features and zeta potential measurement for surface stability and size distribution of the compound obtained or of the multiple particles delivery complex (MPDC)...
July 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28705382/impact-of-cardiorespiratory-fitness-and-risk-of-systemic-hypertension-in-nonobese-versus-obese-men-who-are-metabolically-healthy-or-unhealthy
#18
Sae Young Jae, Abraham Samuel Babu, Eun Sun Yoon, Sudhir Kurl, Jari A Laukkanen, Yoon-Ho Choi, Barry A Franklin
Few data are available regarding the influence of body phenotype on systemic hypertension (SH) and whether cardiorespiratory fitness (CRF) attenuates this relation. We tested the hypothesis that obesity phenotypes and CRF would predict incident hypertension, evaluating 3,800 Korean men who participated in 2 health examinations in1998 to 2009. All participants were normotensive at baseline and were divided into 4 groups based on body mass index using the Asia-Pacific descriptors for obesity and metabolic health status and the National Cholesterol Education Program's adult treatment panel III (ATP-III) criteria...
September 1, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28653216/nmr-characterization-of-htpg-the-e-coli-hsp90-using-sparse-labeling-with-13-c-methyl-alanine
#19
Kari Pederson, Gordon R Chalmers, Qi Gao, Daniel Elnatan, Theresa A Ramelot, Li-Chung Ma, Gaetano T Montelione, Michael A Kennedy, David A Agard, James H Prestegard
A strategy for acquiring structural information from sparsely isotopically labeled large proteins is illustrated with an application to the E. coli heat-shock protein, HtpG (high temperature protein G), a 145 kDa dimer. It uses (13)C-alanine methyl labeling in a perdeuterated background to take advantage of the sensitivity and resolution of Methyl-TROSY spectra, as well as the backbone-centered structural information from (1)H-(13)C residual dipolar couplings (RDCs) of alanine methyl groups. In all, 40 of the 47 expected crosspeaks were resolved and 36 gave RDC data...
July 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28647120/drrc-protein-of-streptomyces-peucetius-removes-daunorubicin-from-intercalated-dnri-promoter
#20
Francis Prija, Ranjan Prasad
DrrC is a DNA-binding protein of Streptomyces peucetius that provides self-resistance against daunorubicin, the antibiotic produced by the organism. DrrC was expressed in E.coli and purified by using N-terminal MBP-tag which retained DNA-binding property in spite of the tag. Mobility shift assay confirmed the interaction of 313bp DNA that has the dnrI promoter, daunorubicin and MBP-DrrC in the presence of ATP. Biotinylated and immobilized 313bp DNA was intercalated with daunorubicin to observe the release of the drug when MBP-DrrC is allowed to act on the DNA...
September 2017: Microbiological Research
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