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Chemistry, Analytical (35):
- Ultracentrifugation
- Differential Thermal Analysis
- Deuterium Exchange Measurement
- Crystallization
- Titrimetry
- Microchemistry
- Electrophoresis
- Desiccation
- Surface Plasmon Resonance
- Molecular Imprinting
- Flow Injection Analysis
- Chemical Fractionation
- Microchip Analytical Procedures
- Dialysis
- Crystallography
- Countercurrent Distribution
- Calorimetry
- Polarography
- Photometry
- Mass Spectrometry
- Precipitation
- Thermogravimetry
- Spin Trapping
- Scattering, Radiation
- Peptide Mapping
- Filtration
- Chromatography
- Binding, Competitive
- Activation Analysis
- Spectrum Analysis
- Refractometry
- Nucleotide Mapping
- Electroosmosis
- Glucose Clamp Technique
- Biuret Reaction
Recent article
Chemistry, Analytical
Kidney International (78)10 2010
Abstract
| < More recent | Older article > |
Kidney International (78)10 2010
Abstract
Kidney International (78)10 2010
Abstract
Kidney International (78)10 2010
Abstract
Kidney International (78)10 2010
Abstract
Kidney International (78)10 2010
Abstract
Abstract
Concentrations of Al, Fe, Mn, Ni, Cu, Cd, Pb, and Zn were measured using DGT (diffusive gradients in thin-films) devices deployed in situ in 34 headwater streams in Northern England. Mean values of filtered samples analyzed by ICP-MS (inductively coupled plasma mass spectrometry) were used, along wi...
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PMID: 19848127
PDF is available here.
PDF is available here.
Abstract
We measured the aqueous solubility of rhombic sulfur and used this information to incorporate, in speciation codes, the thermodynamic constants reported in the literature for the formation of polysulfide complexes. Using the values of pH and total concentrations of dissolved zerovalent sulfur, sulfi...
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PMID: 19848130
PDF is available here.
PDF is available here.
Abstract
We determined the complex stability of copper, zinc, cobalt and aluminum with humic acid (HA) and fulvic acid (FA) in pH 8 seawater. The method is based on metal competition against iron, for which the complex stability with humic substances (HS) in seawater had been calibrated previously against ED...
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PMID: 19848121
PDF is available here.
PDF is available here.
Abstract
Recent progress in understanding the formation/dissociation kinetics of aquatic metal complexes with complexants in different size ranges is evaluated and put in perspective, with suggestions for further studies. The elementary steps in the Eigen mechanism, i.e., diffusion and dehydration of the met...
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PMID: 19848119
PDF is available here.
PDF is available here.
Abstract
Data for interactions between arsenate (AsO4(3-) and fulvic acids (FA) or humic acids (HA) at the surface of goethite are presented (pH 3-7, ionic strength 2 mM and 10 mM). Adsorption of FA and HA leads to desorption of arsenate and a correspondingly strong increase of arsenic concentration in solut...
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PMID: 19848122
PDF is available here.
PDF is available here.
Abstract
The hypothesis that humic acids (HA) can act as carriers of polycyclic aromatic hydrocarbon (PAH) compounds and provide bacteria with PAH fluxes beyond those obtained by diffusion of the water-dissolved fraction of these poorly soluble chemicals was tested. Controlled degradation experiments using m...
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PMID: 19848123
PDF is available here.
PDF is available here.
Abstract
One of the key risk drivers at radioactive waste disposal facilities is radioiodine, especially 129I. As iodine mobility varies greatly with iodine speciation, experiments with 129I-contaminated aquifer sediments from the Savannah River Site located in Aiken, SC, were carried out to test iodine inte...
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PMID: 19848131
PDF is available here.
PDF is available here.
Abstract
The stability and aggregation kinetics of two different suspensions of fullerene (C60) nanoparticles and their relation to nanoparticle charge (electrokinetic) properties were investigated. The two synthesis methods employed--a solvent exchange method involving sonication of fullerene initially diss...
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PMID: 19848133
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
As the field of nanofluidics matures, fundamental discoveries are being applied to lab-on-a-chip analyses. The unique behavior of matter at the nanoscale is adding new functionality to devices that integrate nanopores or nanochannels. (To listen to a podcast about this feature, please go to the Anal...
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PMID: 19663470
PDF is available here.
PDF is available here.
Abstract
Disodium cromoglycate (SCG) is an anti-allergic drug, which is applied locally or inhaled. After administration, a very small portion of the drug is absorbed, being the most eliminated part unchanged in the urine and bile; therefore, its determination in urine is indicative of the dose absorbed. Her...
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PMID: 19576422
PDF is available here.
PDF is available here.
Abstract
Promising voltammetric sensors based on the modification of Pt and poly(3-methylthiophene) (PMT) electrodes with Pd nanoparticles were achieved for the determination of catecholamine neurotransmitters, ascorbic acid and acetaminophen. Electrochemistry of the indicated compounds was studied at these...
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PMID: 19576424
PDF is available here.
PDF is available here.
Abstract
Mg(2+) and Na(+) doped rutile TiO2 nanofibers have been prepared through in situ electrospinning technique and calcination with poly(vinyl pyrrolidone) (PVP) nanofibers as sacrificed template. The as-prepared composite nanofibers are spin-coated onto a ceramic substrate with three pairs of carbon in...
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PMID: 19576470
PDF is available here.
PDF is available here.
Abstract
We can deduce that SCC distillation is a dealcoholization technique minimally destructive with the wine phenolic compounds....
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PMID: 19588980
PDF is available here.
PDF is available here.
Abstract
A method of precolumn derivatization HPLC with fluorescence detection has been developed for the measurement of ammonia, primary methylamine, ethylamine, propylamine, and butylamine in the atmosphere. Air samples were collected by two continuously wetted glass frit/coil samplers, one directly from a...
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PMID: 19731687
PDF is available here.
PDF is available here.
Abstract
We sought to improve this situation by developing a new, low-sample manipulation methodology that does not require any oxidative or pyrolytic treatments but rather differentiates BC from other non-BC organic carbon (OC) using its sorbent properties. The procedure, referred to as the pyrene fluoresce...
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PMID: 19673277
PDF is available here.
PDF is available here.
Planta Medica (75)07 2009
Abstract
Abstract
We have sought to address this problem through the preparation and characterization of novel hybrid materials combining a catalytic MIP, capable of oxidizing the template, catechol, with an electrically conducting polymer. In this way a network of "molecular wires" assists in the conduction of elect...
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PMID: 19354259
PDF is available here.
PDF is available here.
Abstract
A series of fluorescent sensor molecules based on a phosphane sulfide derivative were designed and synthesized. The effect of the distance between the complex entities as well as the number and the length of fluorophores was investigated using both steady-state and time-resolved fluorescence methods...
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PMID: 19343255
PDF is available here.
PDF is available here.
Abstract
The work provides a simple method, based on a direct density equilibrium measurement, for the rapid in situ estimation of total lipid, hydrocarbon or biopolymer content in a variety of prokaryotic and eukaryotic samples. The method can be readily applied to live microalgae and photosynthetic bacteri...
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PMID: 19031427
PDF is available here.
PDF is available here.
Abstract
Solvents play an important and critical role in natural product chemistry. They are mainly used during the extraction and purification of metabolites from a biological matrix. To a lesser extent, solvents are also used as reagents or catalysts to perform chemical reactions. This review focuses on th...
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PMID: 19413130
PDF is available here.
PDF is available here.
Abstract
We describe a validation procedure for chemical fractionation analysis of elements (Al, As, Ba, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, S, Sb, Si, Sr, Ti and V) and soluble ions (Cl(-), NO(3)(-), SO(4)(2-), Na(+), NH(4)(+), Mg(2+), Ca(2+)) in suspended particulate matter (PM). The procedure appli...
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PMID: 19159805
PDF is available here.
PDF is available here.
Abstract
Many environments are subject to periodic fluctuations in pollutant concentrations. Passive samplers, which can provide time weighted average concentrations integrated over the period of deployment, are ideally suited as monitoring tools for these environments. However, the potential for fluctuating...
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PMID: 19350917
PDF is available here.
PDF is available here.
Abstract
The collapse of the World Trade Center Towers on September 11, 2001, sent dust and debris across much of Manhattan and in the surrounding areas. Indoor and outdoor dust samples were collected and characterized by U.S. Geological Survey (USGS) scientists using scanning electron microscopy with energy...
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PMID: 19350918
PDF is available here.
PDF is available here.
Abstract
Electrophoretic deposition (EPD) method has been developed for the fabrication of hydroxyapatite (HA)-CaSiO(3) (CS)-chitosan composite coatings for biomedical applications. The use of chitosan enabled the co-deposition of HA and CS particles and offered the advantage of room temperature processing o...
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PMID: 19012892
PDF is available here.
PDF is available here.
Bioscience Reports (29)1 2009
Abstract
Palytoxin is one of the most complex and biggest molecules known to show extreme acute toxicity. The dinoflagellate Ostreopsis spp., the producer organism of palytoxin, has been shown to be distributed worldwide, thus making palytoxin an emerging toxin. Rat-derived hepatocytes (Clone 9) and BE (2)-M...
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PMID: 18684104
PDF is available here.
PDF is available here.
Abstract
We draw attention to the differences between eukaryotic and prokaryotic glycoproteins. We also focus on the main bottlenecks that may be encountered in the search for glycosylation in concrete bacterium and outline a possible work-flow for the exploration of glycoproteins in bacteria....
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PMID: 19210128
PDF is available here.
PDF is available here.
Abstract
A previously proposed partition equilibrium model for quantitative prediction of analyte response in electrospray ionization mass spectrometry is modified to yield an improved linear relationship. Analyte mass spectrometer response is modeled by a competition mechanism between analyte and background...
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PMID: 19003789
PDF is available here.
PDF is available here.
Abstract
The effect of 2,2,2-trifluoroethanol (TFE) on micellar properties of Triton X-100 (TX-100) in aqueous solutions was investigated by cloud point (CP), viscosity, surface tension, and fluorescence techniques. The critical micelle concentration (CMC) values of the corresponding mixtures were obtained b...
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PMID: 19012893
PDF is available here.
PDF is available here.
Analytical Biochemistry (385)1 2009
Abstract
specificity, linearity (r>0.99), precision (intra and interassay relative standard deviations <5%), robustness, and the limits of detection and quantitation (low and similar for both methods). The main advantage of the use of AUC is to evaluate the antioxidant potential of samples that do not presen...
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PMID: 19027710
PDF is available here.
PDF is available here.
Analytical Biochemistry (385)1 2009
Abstract
Glassy carbon electrode modified with boron oxide nanoparticles supported on multiwall carbon nanotubes was obtained via a facile approach. The as-prepared modified electrode exhibits excellent electrocatalytic activity toward the redox of glucose in pH 7.0 phosphate buffer solution. The electrochem...
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PMID: 19032929
PDF is available here.
PDF is available here.
Abstract
We demonstrate the feasibility of a pure coordinate space implementation in the case of intermediate damping strength and temperature, for times long enough to observe thermal equilibration. After a thorough numerical investigation of the analytically solvable harmonic oscillator case, a Morse oscil...
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PMID: 19173508
PDF is available here.
PDF is available here.
Abstract
Langmuir-Blodgett (LB) and layer-by-layer films (LbL) of a PPV (p-phenylenevinylene) derivative, an azo compound and tetrasulfonated phthalocyanines were successfully employed as transducers in an "electronic tongue" system for detecting trace levels of phenolic compounds in water. The choice of the...
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PMID: 18408956
PDF is available here.
PDF is available here.
Abstract
We describe an algorithm for the continuous monitoring of the biomass and ethanol concentrations as well as the growth rate in the Mezcal fermentation process. The algorithm performs its task having available only the online measurements of the redox potential. The procedure combines an artificial n...
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PMID: 18415126
PDF is available here.
PDF is available here.
Abstract
Traditional mycelium aging technology was improved to enhance arachidonic acid (ARA) production by Mortierella alpina ME-1. Filtration step was skipped and additional carbon and nitrogen sources were fed during aging. The levels of the significant factors (time, temperature, ethanol, and KNO(3)) aff...
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PMID: 18481102
PDF is available here.
PDF is available here.
Abstract
Elucidation of the relationship between the structure and biological function of the glycosaminoglycans (GAGs) heparin and heparan sulfate (HS) presents an important analytical challenge mainly due to the difficulty in determining their fine structure. Heparin and HS are responsible for mediation of...
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PMID: 18841350
PDF is available here.
PDF is available here.
Abstract
Identification and quantification of short-lived electrophilic intermediates through appropriate trapping experiments have become relatively straightforward. Minimizing the bioactivation potential of drug candidates during the discovery/lead optimization phase has been adopted as a default strategy....
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PMID: 19236228
PDF is available here.
PDF is available here.
Abstract
We present the results of an investigation performed in order to obtain a better understanding of the FAIMS technology. The influence of eight factors (polarity of dispersion voltage, outer bias voltage, total gas flow rate, composition of the carrier gas (e.g. %He), outer electrode temperature, rat...
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PMID: 19065601
PDF is available here.
PDF is available here.
Phytochemical Analysis (20)1 2009
Abstract
Analytical Sciences (25)1 2009
Abstract
This review describes a comprehensive investigation focusing on syntheses of analytical reagents, followed by their utilization in development of analytical methods, and leading to practical applications for rational use of medicaments centering on abused drugs. Many kinds of analytical reagents for...
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PMID: 19139569
PDF is available here.
PDF is available here.
Malaria Journal (8)1 2009
Abstract
Of 180 outlets sampled, 25 (13.9%) sold oral artesunate. Outlets selling artesunate were more commonly found in the more malarious southern Laos. Of the 25 outlets, 22 (88%; 95%CI 68-97%) sold counterfeit artesunate, as defined by packaging and chemistry. No artesunate was detected in the counterfei...
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PMID: 19638225
PDF is available here.
PDF is available here.
Abstract
Coniferyl ferulate, which is noted for its multiple pharmacological activities and chemical instability, is abundant in Angelica sinensis. In this paper, five methods, namely sonication extraction (SE), pressurized liquid extraction (PLE), supercritical fluid extraction (SFE), hydrodistillation (HD)...
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PMID: 19169202
PDF is available here.
PDF is available here.
Abstract
An analytical procedure for the determination of 10 drugs belonging to three different therapeutic groups was analysed. Several compounds were investigated which comprise of beta-blockers: sotalol (SOT), metoprolol (MET), propranolol (PRO), carvedilol (CAR); corticosteroids: prednisolone (PRE), dexa...
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PMID: 19633387
PDF is available here.
PDF is available here.
Abstract
The surface of zeolite was modified by cationic beta-cyclodextrin (CCD), which was synthesized with 2, 3-epoxypropyltrimethylammonium chloride (ETMAC) and beta-cyclodextrin (beta-CD), to prepare a novel and effective sorbent for removal of p-nitrophenol (p-NP) from aqueous solution. FTIR, SEM and ED...
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PMID: 19633374
PDF is available here.
PDF is available here.
Abstract
An electricigenic permeable reactive barrier (EPRB) technology was brought forward for remediation of organic-contaminated groundwater, with a benefit that it overcame the limitations of electron acceptor addition in other groundwater remediation methods. To investigate performances of constructions...
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PMID: 19273897
PDF is available here.
PDF is available here.
Abstract
Flocculation of kaolin suspension with aluminium fractal polycations was investigated as a function of aluminium concentration and pH. Aluminium flocculants included Al(13) and Al(13) aggregates with OH/Al ratio of 2.6 and 2.8, respectively. The flocculation kinetics and floc size distribution were...
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PMID: 19237777
PDF is available here.
PDF is available here.
Evaluation of the Compact Dry VP method for screening raw seafood for total Vibrio parahaemolyticus.
Abstract
These results suggest that the CDVP method is useful for screening raw seafood for V. parahaemolyticus....
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PMID: 19205480
PDF is available here.
PDF is available here.
Abstract
La Medicina del lavoro (100)3 2009
Abstract
A simple algorithm was proposed on the basis of field data (n=32) and 5 hazard classes were defined as a function of weight concentrations and asbestos type. The passive sampler is low in cost and is intended for use in large-scale surveys to identifY removal priorities....
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PMID: 19601403
PDF is available here.
PDF is available here.
Abstract
We therefore investigated the structure-activity relationship of phytyl quinols to apply a chemical biosynthesis design for an antiatherosclerosis drug based on isoprenomics. We have achieved the biosynthesis-oriented design and synthesis of alpha- (TX-2254) and beta-(TX-2247) phytyl quinol as an un...
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PMID: 19227458
PDF is available here.
PDF is available here.
ChemPhysChem (9)18 2008
Abstract
We focus on recent studies of the limits of freezing and melting of water in the cylindrical pores of ordered mesoporous silicas with pore diameters in the range of 2-10 nm, based on vapor sorption measurements, calorimetric studies, NMR spectroscopy and cryoporometry, and neutron diffraction studie...
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PMID: 19035394
PDF is available here.
PDF is available here.
Abstract
Bt-maize MON88017, its near-isogenic line DKC5143, and the two conventional varieties DK315 and Benicia were subjected to tetramethylammonium hydroxide (TMAH)-induced thermochemolysis to reveal molecular level lignin patterns. MON88017 is genetically modified to express the Cry3Bb1 protein aimed at...
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PMID: 19053395
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)49 2008
Abstract
The first in-situ and real-time observation of the molecular transport from inside to outside of a liposome was shown by using the second harmonic generation (SHG) technique. The transport of an organic cationic molecule across the liposome bilayer could be switched on and off using the structural c...
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PMID: 19367900
PDF is available here.
PDF is available here.