Showing 1-30 of 505 results for "

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Saer Samanipour et al.
Journal of chromatography. A, 1375, 123-139 (2014-12-17)
Comprehensive two-dimensional gas chromatography (GC×GC) is used widely to separate and measure organic chemicals in complex mixtures. However, approaches to quantify analytes in real, complex samples have not been critically assessed. We quantified 7 PAHs in a certified diesel fuel...
Chun-Chi Wang et al.
Analytical and bioanalytical chemistry, 405(6), 1969-1976 (2012-12-25)
This study describes an on-line stacking CE approach by sweeping with whole capillary sample filling for analyzing five anabolic androgenic steroids in urine samples. The five anabolic steroids for detection were androstenedione, testosterone, epitestosterone, boldenone, and clostebol. Anabolic androgenic steroids...
María M Milesi et al.
Molecular and cellular endocrinology, 401, 248-259 (2014-12-09)
We investigated whether neonatal exposure to low doses of endosulfan affects fertility and uterine functional differentiation at pre-implantation in rats. Newborn female rats received the vehicle, 0.2 µg/kg/d of diethylstilbestrol (DES), 6 µg/kg/d of endosulfan (Endo6) or 600 µg/kg/d of endosulfan (Endo600) on...
Wan Cao et al.
Journal of chromatography. A, 1390, 13-21 (2015-03-10)
This report describes the use of trace-chitosan-wrapped multi-walled carbon nanotubes (CS-MWCNTs) as a sorbent material in dispersive micro solid-phase extraction (DMSPE), which was combined with ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry to analyze phenolic compounds in...
Masashi Kamikawa et al.
Acta histochemica et cytochemica, 47(2), 35-43 (2014-09-16)
We previously demonstrated that macrophages exhibit endoplasmic reticulum fragmentation under cholesterol-rich conditions, which results in the generation of acyl-coenzyme A: cholesterol acyltransferase 1 (ACAT1)-associated late endosomes/lysosomes (ACAT1-LE). ACAT1-LE efficiently esterify free cholesterol in loco, even with abnormal egress of free...
Katerina Naumoska et al.
Journal of chromatography. A, 1381, 229-238 (2015-01-20)
Three TLC methods were used for an initial screening of some common plant triterpenoids and phytosterols in cuticular wax extracts of different vegetables (zucchini, eggplant, tomato, red pepper, mangold, spinach, lettuce, white-colored radicchio di Castelfranco, raddichio Leonardo, white cabbage, red...
Julen Bustamante et al.
Talanta, 114, 32-37 (2013-08-21)
A new procedure based on ultrasound assisted dialysis (UAD) for the simultaneous and quantitative extraction of a wide number of persistent organic pollutants (POPs) such as polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) or some other organochlorinated pesticides (OCPs) contained...
Frady G Adly et al.
Chirality, 26(11), 764-774 (2014-07-22)
A new series of dirhodium(II) tetracarboxylate was derived from N-1,2-naphthaloyl-(S)-amino acid ligands. In terms of enantioselectivity, Rh2 (S-1,2-NTTL)4 () derived from N-1,2-naphthaloyl-(S)-tert-leucine, was the best-performing catalyst among the new series in the enantioselective synthesis of cyclopropylphosphonate derivatives (up to >99%...
Ryan Sestric et al.
Bioresource technology, 164, 41-46 (2014-05-20)
Growth and TAG production by Yarrowia lipolytica were compared for cells cultured in nitrogen-complete medium containing waste glycerol derived from biodiesel production, as well as pure glycerol, dextrose, or canola oil as the carbon sources. Growth and TAG production were...
Edward C Bell et al.
Journal of chromatographic science, 52(9), 1065-1070 (2013-10-31)
A rapid, selective and sensitive ultra-performance liquid chromatography method has been developed for the detection and quantification of tocopherols and retinol in human plasma. Alpha-tocopherol, gamma-tocopherol and retinol are assayed using fluorescence detection. Excitation/emission wavelengths are 295/330 nm and 325/470...
Kyle R Pomraning et al.
PloS one, 10(4), e0123188-e0123188 (2015-04-24)
Yarrowia lipolytica is an oleaginous ascomycete yeast that accumulates large amounts of lipids and has potential as a biofuel producing organism. Despite a growing scientific literature focused on lipid production by Y. lipolytica, there remain significant knowledge gaps regarding the...
Kailin Deng et al.
Journal of agricultural and food chemistry, 63(12), 3161-3167 (2015-03-13)
Carcinogenic nitropolycyclic aromatic hydrocarbons (nitro-PAHs) are ubiquitous in the ambient environment. They are emitted predominantly from internal combustion engines and by reacting polycyclic aromatic hydrocarbons with nitrogen oxide. The emerging evidence that nitro-PAHs are taken up by plants and bioaccumulatd...
Hilal E Toraman et al.
Journal of chromatography. A, 1359, 237-246 (2014-07-30)
The detailed compositional characterization of plastic waste pyrolysis oil was performed with comprehensive two-dimensional GC (GC×GC) coupled to four different detectors: a flame ionization detector (FID), a sulfur chemiluminescence detector (SCD), a nitrogen chemiluminescence detector (NCD) and a time of...
Abdulreza Mashroofeh et al.
Chemosphere, 120, 575-583 (2014-12-03)
The levels of 16 polycyclic aromatic hydrocarbons (PAHs) were determined in the liver, kidney, gills and muscle tissues of Persian sturgeon (Acipenser persicus; n=16), and Stellate sturgeon (Acipenser stellatus; n=7) collected from coastal waters of the South Caspian Sea from...
Wei-Wei Zhao et al.
Journal of chromatography. A, 1370, 121-128 (2014-12-03)
Metal-organic frameworks (MOFs) have great potential for applications in chromatography due to their highly tailorable porous structures and unique properties. In this work, the stable MOF UiO-66 was evaluated as both a normal-phase (NP-) and a reverse-phase (RP-) stationary phase...
Mechanisms and models of neurotoxicity of n-hexane and related solvents.
H Tähti et al.
Archives of toxicology. Supplement. = Archiv fur Toxikologie. Supplement, 19, 337-345 (1997-01-01)
Ponchami Sharma et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 15(18), 4019-4025 (2014-10-11)
Graphene oxide (GO) is amphiphilic in nature, due to its structure, which consists of hydrophilic oxygen-containing functional groups and a hydrophobic basal plane of polyaromatic benzene rings. Due to this amphiphilicity, GO can create stable bubbles at water-organic solvent interfaces....
Baocheng Xu et al.
Food chemistry, 178, 128-135 (2015-02-24)
A new method based on the cholesterol level was developed to detect the presence of animal fats in virgin coconut oil (VCO). In this study, the sterols in VCO and animal fats was separated using conventional one-dimensional gas chromatography (1D...
Ayşegül Doğan et al.
Materials science & engineering. C, Materials for biological applications, 44, 246-253 (2014-10-05)
Scaffold-based bone defect reconstructions still face many challenges due to their inadequate osteoinductive and osteoconductive properties. Various biocompatible and biodegradable scaffolds, combined with proper cell type and biochemical signal molecules, have attracted significant interest in hard tissue engineering approaches. In...
Dong Wei et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 971, 133-140 (2014-10-08)
Dexpramipexole (DEX) was being investigated in clinical studies for the treatment of amyotrophic lateral sclerosis (ALS). To monitor the potential chiral interconversion of dexpramipexole to pramipexole (PPX) in vivo, a highly sensitive and selective chiral LC-MS/MS assay was developed and...
Leonardo Zanchetti Meneghini et al.
International journal of environmental research and public health, 11(11), 11421-11437 (2014-11-08)
A simple and inexpensive method based on solvent extraction followed by low temperature clean-up was applied for determination of seven pyrethroids residues in bovine raw milk using gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) and gas chromatography with electron-capture...
Zahra Merchant et al.
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, 88(3), 816-829 (2014-10-12)
The potential of amphiphilic chitosan formed by grafting octanoyl chains on the chitosan backbone for pulmonary delivery of levofloxacin has been studied. The success of polymer synthesis was confirmed using FT-IR and NMR, whilst antimicrobial activity was assessed against Pseudomonas...
Elise Ivarsen et al.
Journal of AOAC International, 97(5), 1282-1290 (2015-04-24)
Clostridium perfringens is the causative agent of necrotic enteritis leading to significant losses in the poultry industry. Dichloromethane and n-hexane extracts of aerial parts of Artemisia annua (Asteraceae) exhibited activity against C. perfringens with minimum inhibitory concentrations (MIC) of 185...
Yasuhisa Ano et al.
PloS one, 10(3), e0116598-e0116598 (2015-03-12)
Despite the ever-increasing number of dementia patients worldwide, fundamental therapeutic approaches to treat this disease remain to be established. Preventive approaches such as diet, exercise and learning attract attention. Several epidemiological studies suggest that ingestion of fermented dairy products prevents...
Alexandre S Cristino et al.
Nature communications, 5, 5529-5529 (2014-11-21)
Increasing evidence suggests small non-coding RNAs (ncRNAs) such as microRNAs (miRNAs) control levels of mRNA expression during experience-related remodelling of the brain. Here we use an associative olfactory learning paradigm in the honeybee Apis mellifera to examine gene expression changes...
Ioannis N Tsakiris et al.
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, 75, 156-165 (2014-12-03)
The occurrence of residues of DDT and its metabolites was monitored in 196 cow milk samples of various pasteurized commercial types collected from the Greek market. Residue levels were determined by GC-MS analysis. In 97.4% of the samples at least...
David E Blask et al.
PloS one, 9(8), e102776-e102776 (2014-08-08)
The central circadian clock within the suprachiasmatic nucleus (SCN) plays an important role in temporally organizing and coordinating many of the processes governing cancer cell proliferation and tumor growth in synchrony with the daily light/dark cycle which may contribute to...
Anett Kondor et al.
Journal of chromatography. A, 1362, 250-261 (2014-09-03)
Adsorption isotherm data of some alkyl aromatic hydrocarbons (benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene) measured in the temperature range of 423-523K on a partially dealuminated faujasite type DAY F20 zeolite by inverse gas chromatography are presented in this work....
Xianzhi Peng et al.
Journal of chromatography. A, 1384, 97-106 (2015-02-01)
A sensitive and reliable method was developed for multi-target determination of 13 most widely used organic ultraviolet (UV) absorbents (including UV filters and UV stabilizers) in aquatic organism tissues. The organic UV absorbents were extracted using ultrasonic-assisted extraction, purified via...
D J Lanska
Journal of public health policy, 20(4), 441-458 (2000-01-22)
Available industry guidelines and federal standards have failed to fully protect workers from chemical toxicity: none exist for most chemicals, many are biased toward what can easily be achieved, and many were developed long after health consequences became evident. Limitations...