keyword
MENU ▼
Read by QxMD icon Read
search

Factores

keyword
https://www.readbyqxmd.com/read/28738670/antidoping-program-an-important-factor-in-the-promotion-and-protection-of-the-integrity-of-sport-and-athlete-s-health
#1
Filomena Mazzeo, Vincenzo Monda, Stefania Santamaria, Ersilia Nigro, Anna Valenzano, Ines Villano, Giuseppe Cibelli, Antonietta Messina, Giovanni Messina
Use of performance-enhancing drugs concern not only elite Olympic and Paralympic Games' athletes but also amateur athletes, who are making increasing use of substances and/or methods. Furthermore, a new frontier reached by the doping is the use of genes. World Anti- Doping Agency (WADA), expressly prohibited the participation in competitive sports by the athlete in case of taking banned substances to treat disease in the event that the above assumption implies an excessive improvement of performance. This study aims to analyze and show the doping control as an essential part of the anti-doping program to promote and protect the integrity of sport and athlete's health...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28738667/toe-grip-strength-in-middle-aged-individuals-as-a-risk-factor-for-falls
#2
Ryota Tsuyuguchi, Satoshi Kurose, Takayuki Seto, Nana Takao, Satoshi Tagashira, Hiromi Tsutsumi, Shingo Otsuki, Yutaka Kimura
BACKGROUND: Toe grip strength is the force of a toe on a surface. The objective of this study was to investigate the relationship between falls in middle-aged individuals and physical strength factors such as toe grip strength and knee extension strength. METHODS: The subjects were 194 middle-aged individuals (388 feet) who were independent in daily life, received no nursing care, and participated in a health sports event organized by a sports club. We evaluated the body composition, blood pressure, vascular age, systemic response, bone density, knee extension strength, and toe grip strength, and examined their relationship using a self-administered questionnaire survey...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28738666/influence-of-kitesurf-equipment-on-injury-rates
#3
Sebastian F Baumbach, Tanja Stawinski, Daniel Schmitz, Carsten Schoeneberg, Marcus Jäger, Christian Wedemeyer, Max D Kauther
BACKGROUND: Various injuries in kitesurfing (KS) have been reported so far. The aim of this study was to validate the effect of different kite designs and safety equipment on the injury rate compared to older studies. METHODS: A retrospective epidemiological study based on an anonymous face-to-face survey was conducted amongst active kitesurfers. The questionnaire consisted of 66 questions focusing on the equipment used, injury rates, overuse injuries and gender differences...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28738647/development-of-an-analytical-methodology-for-obtaining-quantitative-mass-concentrations-from-laap-tof-ms-measurements
#4
Rachel Gemayel, Brice Temime-Roussel, Nathalie Hayeck, Adrien Gandolfo, Stig Hellebust, Sasho Gligorovski, Henri Wortham
Laser ablation aerosol particle-time of flight mass spectrometer (LAAP-ToF-MS) measures the size number of particles, and chemical composition of individual particles in real-time. LAAP-ToF-MS measurements of chemical composition are difficult to quantify, mostly because the instrument sensitivities to various chemical species in the multicomponent atmospheric aerosol particles are unknown. In this study, we investigate a field-based approach for quantitative measurements of ammonium, nitrate, sulfate, OC, and EC, in size-segregated atmospheric aerosols, by LAAP-ToF-MS using concurrent measurements from high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), and multi-angle absorption photometer (MAAP)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738646/synthesis-characterization-and-application-of-a-novel-multifunctional-stationary-phase-for-hydrophilic-interaction-reversed-phase-mixed-mode-chromatography
#5
Hayriye Aral, K Serdar Çelik, Ramazan Altındağ, Tarık Aral
A novel multifunctional stationary phase based on silica gel was synthesised starting from L- isoleucine and 4-phenylbutylamine and evaluated as a hydrophilic interaction/reversed-phase mixed-mode stationary phase for high-performance liquid chromatography (HPLC). The prepared stationary phase was characterized by elemental analysis, infrared spectroscopy (IR), scanning electron microscopy (SEM), Brunauer, Emmett and Teller (BET) and solid-state (13)C nuclear magnetic resonance (NMR). The mechanisms involved in the chromatographic separation are multi-interaction, including hydrophobic, π-π, hydrogen-bonding, dipole-dipole and ion-dipole interactions...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738636/one-step-hydrothermal-synthesis-and-characterization-of-moss-like-mwcnt-bi2s3-nanomaterial-for-solid-phase-extraction-of-copper
#6
Zainab Manzoor Memon, Erkan Yilmaz, Mustafa Soylak
The present work was designed with the aim to one step simple hydrothermal synthesis of moss like MWCNT-Bi2S3 nanomaterial as solid phase extraction sorbent for separation, preconcentration and determination of copper in tobacco and food samples. Cu(II) ions was strongly retained on the MWCNT-Bi2S3 nanomaterial at the pH 7.0 and was successfully desorbed by using 1.5mL of 4M HNO3. The copper concentration in eluent was determined by flame atomic absorption spectrometer. The certified reference material (NC SZC 73033 Scallion) was analyzed for the verification and accuracy of the proposed method...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738634/determination-of-synthetic-phosphodiesterase-5-inhibitors-by-lc-ms-2-in-waters-and-human-urine-submitted-to-dispersive-liquid-liquid-microextraction
#7
Natalia Campillo, Javier Marín, José Fenoll, Isabel Garrido, Ignacio López-García, Manuel Hernández-Córdoba, Pilar Viñas
High-performance liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS(2)) with a triple quadrupole is proposed for determining the synthetic phosphodiesterase-5 inhibitors, sildenafil, tadalafil and vardenafil, and the active metabolite N-desmethyl sildenafil. The method was successfully applied to the analysis of waters of different origins and human urine samples. Dispersive liquid-liquid microextraction (DLLME) was applied in the classical way for water analysis, whereas a previous extraction into an organic solvent was necessary for urine samples, the acetonitrile extract being used as dispersant solvent in the DLLME step...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738623/analysis-of-illegal-peptide-drugs-via-hilic-dad-ms
#8
Steven Janvier, Evelien De Sutter, Evelien Wynendaele, Bart De Spiegeleer, Celine Vanhee, Eric Deconinck
Biopharmaceuticals have established themselves as highly efficient medicines, and are still one of the fastest growing parts of the health-product industry. Unfortunately, the introduction of these promising new drugs went hand in hand with the creation of a black market for illegal and counterfeit biotechnology drugs. Particularly popular are the lyophilised peptides with a molecular weight of less than 5kDa. Most of them are meant for subcutaneous injection and are easily accessible via the internet. In recent years, different methods based on reversed phase liquid chromatography have been developed to detect and quantify these peptides...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738621/determining-heterocyclic-aromatic-amines-in-aqueous-samples-a-novel-dispersive-liquid-liquid-micro-extraction-method-based-on-solidification-of-floating-organic-drop-and-ultrasound-assisted-back-extraction-followed-by-uplc-ms-ms
#9
Romina Canales, María Guiñez, Cristian Bazán, Mario Reta, Soledad Cerutti
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet combined with ultrasound assisted back extraction for the determination of four heterocyclic aromatic amines in natural water samples prior ultra high-performance liquid chromatography-tandem mass spectrometry was developed. The analytes were extracted from the water samples by a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop, which was performed by a mixture composed by a less dense than water extraction solvent, 1-undecanol, and a dispersive solvent, methanol...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738603/vortex-assisted-liquid-liquid-liquid-microextraction-followed-by-high-performance-liquid-chromatography-for-the-simultaneous-determination-of-fourteen-phenolic-acids-in-honey-iced-tea-and-canned-coffee-drinks
#10
Marwan Shalash, Ahmad Makahleh, Salizawati Muhamad Salhimi, Bahruddin Saad
A vortex-assisted liquid-liquid-liquid microextraction method followed by high performance liquid chromatography-diode array detection for the determination of fourteen phenolic acids (cinnamic, m-coumaric, chlorogenic, syringic, ferulic, o-coumaric, p-coumaric, vanillic, p-hydroxybenzoic, caffeic, 2, 4-dihydroxybenzoic, sinapic, gentisic and gallic acids) in honey, iced tea and canned coffee drink samples has been developed. The separation was achieved using a Poroshell 120-EC-C18 column under a gradient elution at a flow rate of 0...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738601/biosensor-assisted-selection-of-optimal-parameters-for-designing-molecularly-imprinted-polymers-selective-to-phosmet-insecticide
#11
Nadin Aftim, Georges Istamboulié, Elena Piletska, Sergey Piletsky, Carole Calas-Blanchard, Thierry Noguer
Molecularly imprinted polymers (MIPs) for phosmet insecticide were synthesized by batch polymerization. The affinity of functional monomers to phosmet was tested using an original method involving an electrochemical biosensor based on acetylcholinesterase inhibition. It was demonstrated that association of phosmet with appropriate functional monomers resulted in a decrease of enzyme inhibition. Using this method, it was shown that N,N-methylenebis(acrylamide) displayed the highest interactions with phosmet using DMSO as solvent...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738591/procedures-for-precise-measurements-of-135-cs-137-cs-atom-ratios-in-environmental-samples-at-extreme-dynamic-ranges-and-ultra-trace-levels-by-thermal-ionization-mass-spectrometry
#12
James A Dunne, David A Richards, Hsin-Wei Chen
Determination of (135)Cs/(137)Cs atom ratios has the potential to be a powerful tool for nuclear forensics and monitoring environmental processes. We present optimized chemical separation techniques and thermal ionization mass spectrometry (TIMS) protocols to obtain precise (135)Cs/(137)Cs atom ratios for a range of environmental sample types. We use a combination of double AMP-PAN separation and Sr-spec resin column purification to yield excellent separation from the alkali metals (Rb separation factor > 600), which normally suppress ionization of Cs...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738582/metaboqc-a-tool-for-correcting-untargeted-metabolomics-data-with-mass-spectrometry-detection-using-quality-controls
#13
Mónica Calderón-Santiago, María A López-Bascón, Ángela Peralbo-Molina, Feliciano Priego-Capote
Nowadays most metabolomic studies involve the analysis of large sets of samples to find a representative metabolite pattern associated to the factor under study. During a sequence of analyses the instrument signals can be subjected to the influence of experimental variability sources. Implementation of quality control (QC) samples to check the contribution of experimental variability is the most common approach in metabolomics. This practice is based on the filtration of molecular entities experiencing a variation coefficient higher than that measured in the QC data set...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738575/analytical-methodology-for-the-electro-catalytic-determination-of-estradiol-and-progesterone-based-on-graphene-quantum-dots-and-poly-sulfosalicylic-acid-co-modified-electrode
#14
Majid Arvand, Shiva Hemmati
The goal of this study was to develop an electroanalytical method for the simultaneous determination of steroid hormones for the first time. The key factor in the electrochemical methods is the choice of suitable electrode materials. For this purpose, graphene quantum dots (GQDs) doped poly(sulfosalicylic acid) (PSSA) was immobilized on a glassy carbon electrode (GCE). Apart from exhibition strong and stable electrocatalytic response towards estradiol (E2) and progesterone (P4), the proposed sensor was able to distinguish two hormone's oxidation peaks clearly...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738567/application-of-thermoresponsive-hydrogel-gold-nanorods-composites-in-the-detection-of-diquat
#15
Caiyun Jiang, Xiaoyuan Ma, Maoyun Xue, Hong-Zhen Lian
Gallic acid (GA) was employed as a reducing agent for facile in situ preparation of gold nanorods (GNRs) in thermoresponsive P(NIPAM-NVP) hydrogel films. Based on the surface-enhanced Raman scattering (SERS) effect of GNRs and the enrichment effect of thermoresponsive hydrogel film on test molecules through a shrinkage process, the obtained P(NIPAM-NVP)/GNRs composites have been used as SERS substrate for the rapid detection of diquat. The influences of substrate pre-treatment, laser wavelength, and sample treatment method on diquat determination have been investigated comprehensively...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738566/preparation-and-evaluation-of-a-novel-n-benzyl-phenethylamino-%C3%AE-cyclodextrin-bonded-chiral-stationary-phase-for-hplc
#16
Liang Li, Biaoping Cheng, Rendan Zhou, Zhigang Cao, Chun Zeng, Laisheng Li
A novel N-benzyl-phenethylamino-β-cyclodextrin-bonded ordered mesoporous SBA-15 chiral stationary phase (BZCDP) for high-performance liquid chromatography (HPLC) was prepared. The structure and morphology of the ligand and the stationary phase were characterized by mass spectrometry, elemental analysis, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis. The enantiomers of chiral compounds including nine common β-adrenergic blocker drugs (β-blockers), eight dansyl amino acids (DNS-AA) and six flavanones were successfully separated by polar organic solvent and reversed-phase chromatography, respectively...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738559/a-novel-dianionic-amino-acid-ionic-liquid-coated-peg-4000-modified-fe3o4-nanocomposite-for-the-magnetic-solid-phase-extraction-of-trypsin
#17
Qin Yang, Yuzhi Wang, Hongmei Zhang, Kaijia Xu, Xiaoxiao Wei, Panli Xu, Yigang Zhou
A novel magnetic extractant, PEG 4000 modified Fe3O4nanomaterial that coated with dianionic amino acid ionic liquid (Fe3O4@PEG@DAAAIL), was successfully synthesized and characterized. X-ray diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM), fourier transform infrared spectrometry (FT-IR), thermal gravimetric analysis (TGA) and zeta potentials were used to confirm that the novel nanocomposite was successfully synthesized. Subsequently, the prepared Fe3O4@PEG@DAAAIL nanocomposite was used as the extractant for trypsin coupled with magnetic solid-phase extraction (MSPE)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738557/multielemental-analysis-of-18-essential-and-toxic-elements-in-amniotic-fluid-samples-by-icp-ms-full-procedure-validation-and-estimation-of-measurement-uncertainty
#18
B Markiewicz, A Sajnóg, W Lorenc, A Hanć, I Komorowicz, J Suliburska, R Kocyłowski, D Barałkiewicz
Amniotic fluid is the substantial factor in the development of an embryo and fetus due to the fact that water and solutes contained in it penetrate the fetal membranes in an hydrostatic and osmotic way as well as being swallowed by the fetus. Elemental composition of amniotic fluid influences the growth and health of the fetus, therefore, an analysis of amniotic fluid is important because the results would indicate abnormal levels of minerals or toxic elements. Inductively coupled plasma mass spectroscopy (ICP-MS) is often used for determination of trace and ultra-trace level elements in a wide range of matrices including biological samples because of its unique analytical capabilities...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738556/development-of-a-new-sample-preparation-method-based-on-liquid-liquid-liquid-extraction-combined-with-dispersive-liquid-liquid-microextraction-and-its-application-on-unfiltered-samples-containing-high-content-of-solids
#19
Mir Ali Farajzadeh, Maryam Abbaspour
A new sample preparation method based on liquid-liquid-liquid extraction combined with dispersive liquid-liquid microextraction followed by gas chromatography-flame ionization detection has been reported for the extraction/preconcentration and determination of trace levels of twelve pesticide residues from different samples with high content of solids without filtration. This method consists of a three-phase system including an aqueous phase (sample solution), acetonitrile, and hexane. The extraction mechanism is based on different affinities of the substances from the sample matrices towards each of the involved phase, which provides a high selectivity to the process...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738551/biomass-saccharification-is-largely-enhanced-by-altering-wall-polymer-features-and-reducing-silicon-accumulation-in-rice-cultivars-harvested-from-nitrogen-fertilizer-supply
#20
Zahoor, Dan Sun, Ying Li, Jing Wang, Yuanyuan Tu, Yanting Wang, Zhen Hu, Shiguang Zhou, Lingqiang Wang, Guosheng Xie, Jianliang Huang, Aftab Alam, Liangcai Peng
In this study, two rice cultivars were collected from experimental fields with seven nitrogen fertilizer treatments. All biomass samples contained significantly increased cellulose contents and reduced silica levels, with variable amounts of hemicellulose and lignin from different nitrogen treatments. Under chemical (NaOH, CaO, H2SO4) and physical (hot water) pretreatments, biomass samples exhibited much enhanced hexoses yields from enzymatic hydrolysis, with high bioethanol production from yeast fermentation...
July 12, 2017: Bioresource Technology
keyword
keyword
116875
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"