keyword
MENU ▼
Read by QxMD icon Read
search

distributed, massed

keyword
https://www.readbyqxmd.com/read/29236175/an-assessment-of-metal-humus-complexes-in-river-waters-of-the-upper-amur-basin-russia
#1
Svetlana Levshina
The dissolved metal concentrations have been assessed for Co, Cr, Cu, Fe, Mn, Ni, V, Zn, Ca, Mg, and Cd, and their complex compounds with humic substances (Me-HS complexes) in river waters of the Upper Amur basin using the inductively coupled plasma-mass spectrometry technique. The study shows an increase in the amount of Me-HS complexes from the southwestern steppe and forest-steppe to the northeastern mountainous taiga areas. In alkali waters of the steppe and forest-steppe areas with low concentrations of HS, the amount of Zn-HS complexes increases considerably...
December 13, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29236152/transport-pathway-and-source-area-for-artemisia-pollen-in-beijing-china
#2
Xiaoxin Qin, Yiyin Li, Xu Sun, Ling Meng, Xiaoke Wang
Artemisia pollen is an important allergen responsible for allergic rhinitis in Beijing, China. To explore the transport pathways and source areas of Artemisia pollen, we used Burkard 7-day traps to monitor daily pollen concentrations in 2016 in an urban and suburban locality. Backward trajectories of 24- and 96-h and their cluster analysis were performed to identify transport pathways of Artemisia pollen using the HYSPLIT model on 0.5° × 0.5° GADS meteorological data. The potential source contribution function (PSCF) and concentration weighted trajectory (CWT) were calculated to further identify the major potential source areas at local, regional, and long-range scales...
December 13, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29236134/determination-of-halogenated-flame-retardants-by-gc-api-ms-ms-and-gc-ei-ms-a-multi-compound-multi-matrix-method
#3
Frank Neugebauer, Annekatrin Dreyer, Nina Lohmann, Jan Koschorreck
The extensive application of halogenated flame retardants has led to their widespread distribution in the environment. Recently, concerns emerged regarding their potential persistence, (bio)accumulation, and/or toxicity. Particularly halogenated flame retardants based on norbornene structures, like Dechlorane Plus as well as other brominated PBDE replacements, generically called emerging, novel, or alternative flame retardants, are in the focus of interest. A comprehensive analytical method for the determination of 21 halogenated flame retardants (HFRs) of different substance classes (dechloranes, brominated aromates, brominated ethers, cyclic BFR) in a broad variety of matrices (tree leaves, fish fillet, birds eggs, suspended particles) was developed in order to assess their environmental levels as well as temporal trends, especially for the use within environmental specimen banks (ESBs)...
December 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29235702/in-vitro-evaluation-of-resilient-liner-after-brushing-with-conventional-and-experimental-ricinus-communis-based-dentifrices
#4
Maurício Malheiros Badaró, Talita Pereira Prates, Vanessa Maria Fagundes Leite-Fernandes, Viviane de Cássia Oliveira, Helena de Freitas Oliveira Paranhos, Cláudia Helena Silva-Lovato
PURPOSE: To evaluate the effect of experimental (Ricinus communis) and commercial dentifrices used for denture cleaning on abrasiveness (gravimetric method; roughness), hardness, and color stability of a resilient relining material. MATERIALS AND METHODS: Sixty circular (15 × 3 mm) specimens were distributed into four groups: C (control; brushing with water); CO (brushing with Colgate - for natural teeth); CB (brushing with Corega Brite - for complete dentures); RC (brushing with experimental dentifrice)...
December 13, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29235298/-effect-of-saposhnikoviae-radix-on-pharmacokinetics-and-tissue-distributions-of-active-components-in-tongxie-yaofang-in-rats
#5
Rui-Feng Liang, Wen-Jing Ge, Zheng Wei, Xue-Xia Zhang, Wei-Feng Cui, Xue Liu, Geng-Sheng Li
Tongxie Yaofang (TXYF) is a famous formula that has been used for treating gastrointestinal diseases in traditional Chinese medicine(TCM). Saposhnikoviae Radix is considered as a meridian guiding drug in TXYF and could enhance the effectiveness of prescription. However, the scientific evidence for this effect is still not clear. To reveal the interactions of Saposhnikoviae Radix with other herbs, we conducted this study on the pharmacokinetic profile and tissue distribution of active ingredients of TXYF in rats...
October 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29232995/tissue-imaging-with-in-situ-solid-phase-extraction-micro-funnel-based-spray-ionization-mass-spectrometry
#6
Wan Li, Xiangfeng Chen, Ze Wang, Yl Elaine Wong, Ri Wu, Y-L Winnie Hung, T-W Dominic Chan
Current imaging mass spectrometry techniques are faced with a major challenge related to ion suppression effect. Data regarding low-abundance components or low-polarity compounds cannot be normally obtained presumably because of the discrimination effect of easily ionized chemical components on desorption/ionization process. In this study, a new method was proposed to obtain images of chemical components in biological tissues or sections through in situ solid-phase extraction in sorbent mounted micro-funnel based spray ionization mass spectrometry...
January 1, 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29232994/tautomerism-of-uracil-and-related-compounds-a-mass-spectrometry-study
#7
Diego D Colasurdo, Matías N Pila, Dacio A Iglesias, Sergio L Laurella, Danila L Ruiz
It has been demonstrated that uracil has a preponderant tautomeric form, but it is also known that different tautomers co-exist in this equilibrium. In this work, mass spectrometry is used as a helpful tool to analyse the equilibria, using derivative compounds to forbid the presence of some tautomers and ion trap mass spectrometry to follow relevant fragmentation pathways. Theoretical calculations were performed to confirm tautomers abundance by energy minimization in gas phase. Analysis of mass spectra of uracil, three methyl-substituted uracils, 2-thiouracil and three benzouracils suggest that uracil exists mainly as three tautomers in gas phase: one major structure that corresponds to the classical structure of uracil (pyrimidine-2,4(1H,3H)-dione) bearing two carbonyls and two NH moieties, and two minor enolic forms (4-hydroxypyrimidin-2(1H)-one and 2-hydroxypyrimidin-4(1H)-one)...
January 1, 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29232975/mass-spectrometric-studies-on-selective-androgen-receptor-modulators-sarms-using-electron-ionization-and-electrospray-ionization-collision-induced-dissociation
#8
Mario Thevis, Dietrich A Volmer
Selective androgen receptor modulators (SARMs) have been identified as a promising class of drug candidates potentially applicable to diverse pathological conditions commonly associated with significantly reduced muscle mass. Due to a suspected and meanwhile repeatedly proven misuse of SARMs in elite and amateur sport, sustaining constantly updated doping control analytical methods is critical for sports drug testing laboratories. These test methods predominantly utilize mass spectrometry-based instrumentations and, consequently, studies on the mass spectrometric behavior of new compounds and, where available, their metabolic products are vital for comprehensive doping controls...
January 1, 2017: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/29232191/salivary-adiponectin-concentration-in-healthy-adult-males-in-relation-to-anthropometric-measures-and-fat-distribution
#9
Mona Mohamed Ibrahim Abdalla, S C Soon
OBJECTIVES: Body fat content, fat distribution, and adiponectin level are important variables in the development of obesity related complications. Anthropometric indices may provide an economic and faster method in measuring the risk for complications through their predictive effect of fat distribution and adiponectin concentration. We aimed to determine, which of the waist circumference (WC), waist-to-hip ratio (WHR), and body mass index (BMI) may be the best predictor for the total fat percentage (WF), visceral fat level (VF), and subcutaneous whole-body fat (SCWBF)...
October 26, 2017: Endocrine Regulations
https://www.readbyqxmd.com/read/29232050/affinity-extraction-of-emerging-contaminants-from-water-based-on-bovine-serum-albumin-as-a-binding-agent
#10
Efthimia Papastavros, Rachael A Remmers, Daniel D Snow, David A Cassada, David S Hage
Affinity sorbents using bovine serum albumin as a binding agent were developed and tested for the extraction of environmental contaminants from water. Computer simulations based on a countercurrent distribution model were also used to study the behavior of these sorbents. Several model drugs, pesticides and hormones of interest as emerging contaminants were considered in this work, with carbamazepine being used as a representative analyte when coupling the albumin column on-line with liquid chromatography and tandem mass spectrometry...
December 12, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29231883/silver-nanoparticles-in-the-lung-toxic-effects-and-focal-accumulation-of-silver-in-remote-organs
#11
Martin Wiemann, Antje Vennemann, Franziska Blaske, Michael Sperling, Uwe Karst
The distribution of silver (Ag) into remote organs secondary to the application of Ag nanoparticles (Ag-NP) to the lung is still incompletely understood and was investigated in the rat with imaging methods. Dose-finding experiments were carried out with 50 nm- or 200 nm-sized polyvinyl pyrrolidine (PVP)-coated Ag-NP using alveolar macrophages in vitro and female rats, which received Ag-NP via intratracheal instillation. In the main study, we administered 37.5-300 µg per rat lung of the more toxic Ag50-PVP and assessed the broncho-alveolar lavage fluid (BALF) for inflammatory cells, total protein and fibronectin after three and 21 days...
December 12, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29230714/obesity-phenotypes-depot-differences-in-adipose-tissue-and-their-clinical-implications
#12
REVIEW
Valeria Guglielmi, Paolo Sbraccia
Obesity, defined as excess fat mass, increases risks for multiple chronic diseases, such as type 2 diabetes, cardiovascular disease, and several types of cancer. Beyond adiposity per se, the pattern of fat distribution, android or truncal as compared to gynoid or peripheral, has a profound influence on systemic metabolism and hence risk for obesity complications. Not only factors as genetics, environment, gender, and age account for the apparent compartmentalization of white adipose tissue (WAT) in the body...
December 11, 2017: Eating and Weight Disorders: EWD
https://www.readbyqxmd.com/read/29230490/pharmacokinetic-study-of-tianeptine-and-its-active-metabolite-mc5-in-rats-following-different-routes-of-administration-using-a-novel-liquid-chromatography-tandem-mass-spectrometry-analytical-method
#13
Małgorzata Szafarz, Agnieszka Wencel, Krzysztof Pociecha, Filip A Fedak, Piotr Wlaź, Elżbieta Wyska
Tianeptine is an atypical antidepressant with a unique mechanism of action and recently it has been also reported that its major metabolite, compound MC5, possesses pharmacological activity similar to that of the parent drug. The current study aims to investigate the pharmacokinetics (PK) of both tianeptine and MC5 after intravenous or intraperitoneal administration of the parent drug as well as the metabolic ratio of MC5 in rats. To achieve these goals an LC-MS/MS method using the small sample volume for the quantitation of tianeptine and its active metabolite MC5 in rat plasma and liver perfusate has been developed and validated...
December 12, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29230371/mass-marking-of-juvenile-schizothorax-wangchiachii-fang-with-alizarin-red-s-and-evaluation-of-stock-enhancement-in-the-jinping-area-of-the-yalong-river
#14
Kun Yang, Shu Li, Xiaoshuai Liu, Weixiong Gan, Longjun Deng, Yezhong Tang, Zhaobin Song
Schizothorax wangchiachii is a key fish species in the stock enhancement program of the Yalong River hydropower project, China. Alizarin red S (ARS) was used to mark large numbers of juvenile S. wangchiachii in the Jinping Hatchery and later used to evaluate stock enhancement in the Jinping area of the Yalong River. In a small-scale pilot study, 7,000 juveniles of the 2014 cohort were successfully marked by immersion in ARS solution, and no mortality was recorded during the marking process. The ARS mark in the fish otoliths remained visible 20 months later...
2017: PeerJ
https://www.readbyqxmd.com/read/29229139/comparison-of-the-lund-and-browder-table-to-computed-tomography-scan-three-dimensional-surface-area-measurement-for-a-pediatric-cohort
#15
R Wolfgang Rumpf, William C L Stewart, Stephen K Martinez, Chandra Y Gerrard, Natalie L Adolphi, Rajan Thakkar, Alan Coleman, Adrian Rajab, William C Ray, Renata Fabia
BACKGROUND: Treating burns effectively requires accurately assessing the percentage of the total body surface area (%TBSA) affected by burns. Current methods for estimating %TBSA, such as Lund and Browder (L&B) tables, rely on historic body statistics. An increasingly obese population has been blamed for increasing errors in %TBSA estimates. However, this assumption has not been experimentally validated. We hypothesized that errors in %TBSA estimates using L&B were due to differences in the physical proportions of today's children compared with children in the early 1940s when the chart was developed and that these differences would appear as body mass index (BMI)-associated systematic errors in the L&B values versus actual body surface areas...
January 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29228958/sero-prevalence-risk-factors-and-distribution-of-sheep-and-goat-pox-in-amhara-region-ethiopia
#16
Tsegaw Fentie, Nigusie Fenta, Samson Leta, Wassie Molla, Birhanu Ayele, Yechale Teshome, Seleshe Nigatu, Ashenafi Assefa
BACKGROUND: Sheep pox and goat pox are contagious viral diseases of sheep and goats, respectively. The diseases result in substantial economic losses due to decreased milk and meat production, damage to hides and wool, and possible trade restriction. A study was undertaken in Amhara region of Ethiopia. A cross-sectional study design was used to estimate the sero-prevalence and identify associated risk factors, while retrospective study design was used to assess the temporal and spatial distribution of the disease...
December 11, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/29228872/the-in-vivo-pharmacokinetics-tissue-distribution-and-excretion-investigation-of-mesaconine-in-rats-and-its-in-vitro-intestinal-absorption-study-using-uplc-ms-ms
#17
Xiuxiu Liu, Minghai Tang, Taohong Liu, Chunyan Wang, Qiaoxin Tang, Yaxin Xiao, Ruixin Yang, Ruobing Chao
Mesaconine, an ingredient from Aconitum carmichaelii Debx., has been proven to have cardiac effect. For further development and better pharmacological elucidation, the in vivo process and intestinal absorptive behavior of mesaconine should be investigated comprehensively. An ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed and validated for quantitation of mesaconine in rat plasma, tissue homogenates, urine and feces to investigate the in vivo pharmacokinetic profiles, tissue distribution and excretion...
December 12, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/29228687/interactions-between-rasa2-cadm1-hif1an-gene-polymorphisms-and-body-fatness-with-breast-cancer-a-population-based-case-control-study-in-china
#18
Zheng Zhu, Zhimei Teng, Fränzel J B van Duijnhoven, Meihua Dong, Yun Qian, Hao Yu, Jie Yang, Renqiang Han, Jian Su, Wencong Du, Xingyu Huang, Jinyi Zhou, Xiaojin Yu, Ellen Kampman, Ming Wu
Genome-wide association studies (GWAS) have indicated that gene polymorphisms in alleles of RAS p21 protein activator 2 (RASA2), cell adhesion molecule 1 (CADM1) and hypoxia inducible factor 1 alpha subunit inhibitor (HIF1AN) are associated with the risk of obesity. In this study, we explored the interactions between candidate SNPs of RASA2 (rs16851483), CADM1 (rs12286929) and HIF1AN (rs17094222) and body fatness for breast cancer risk. Unconditional logistic regression models were applied to measure the associations of related factors with breast cancer by odds ratios (ORs) and 95% confidence intervals (CIs)...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29228006/sea-star-wasting-disease-in-asterias-forbesi-along-the-atlantic-coast-of-north-america
#19
Caitlin Bucci, Madison Francoeur, Jillon McGreal, Roxanna Smolowitz, Vanesa Zazueta-Novoa, Gary M Wessel, Marta Gomez-Chiarri
As keystone species, sea stars serve to maintain biodiversity and species distribution through trophic level interactions in marine ecosystems. Recently, Sea Star Wasting Disease (SSWD) has caused widespread mass mortality in several sea star species from the Pacific Coast of the United States of America (USA) and Asterias forbesi on the Atlantic Coast. A densovirus, named Sea Star associated Densovirus (SSaDV), has been associated with the wasting disease in Pacific Coast sea stars, and limited samples of A...
2017: PloS One
https://www.readbyqxmd.com/read/29227479/multiscale-virtual-particle-based-elastic-network-model-mvp-enm-for-normal-mode-analysis-of-large-sized-biomolecules
#20
Kelin Xia
In this paper, a multiscale virtual particle based elastic network model (MVP-ENM) is proposed for the normal mode analysis of large-sized biomolecules. The multiscale virtual particle (MVP) model is proposed for the discretization of biomolecular density data. With this model, large-sized biomolecular structures can be coarse-grained into virtual particles such that a balance between model accuracy and computational cost can be achieved. An elastic network is constructed by assuming "connections" between virtual particles...
December 11, 2017: Physical Chemistry Chemical Physics: PCCP
keyword
keyword
106015
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"