Conductometry
Chromatography, High Pressure Liquid
Chromatography, Gas
Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.
Chromatography, Affinity
Chromatography, Gel
Chromatography, Ion Exchange
Chromatography
Techniques used to separate mixtures of substances based on differences in the relative affinities of the substances for mobile and stationary phases. A mobile phase (fluid or gas) passes through a column containing a stationary phase of porous solid or liquid coated on a solid support. Usage is both analytical for small amounts and preparative for bulk amounts.
Candy
Sweet food products combining cane or beet sugars with other carbohydrates and chocolate, milk, eggs, and various flavorings. In the United States, candy refers to both sugar- and cocoa-based confections and is differentiated from sweetened baked goods; elsewhere the terms sugar confectionary, chocolate confectionary, and flour confectionary (meaning goods such as cakes and pastries) are used.
Crystallization
Encyclopedias as Topic
Lindera
Maple Syrup Urine Disease
An autosomal recessive inherited disorder with multiple forms of phenotypic expression, caused by a defect in the oxidative decarboxylation of branched-chain amino acids (AMINO ACIDS, BRANCHED-CHAIN). These metabolites accumulate in body fluids and render a "maple syrup" odor. The disease is divided into classic, intermediate, intermittent, and thiamine responsive subtypes. The classic form presents in the first week of life with ketoacidosis, hypoglycemia, emesis, neonatal seizures, and hypertonia. The intermediate and intermittent forms present in childhood or later with acute episodes of ataxia and vomiting. (From Adams et al., Principles of Neurology, 6th ed, p936)
Carbon Dioxide
Commerce
The interchange of goods or commodities, especially on a large scale, between different countries or between populations within the same country. It includes trade (the buying, selling, or exchanging of commodities, whether wholesale or retail) and business (the purchase and sale of goods to make a profit). (From Random House Unabridged Dictionary, 2d ed, p411, p2005 & p283)
Prescription Fees
Philately
Chemistry, Analytic
Polarography
An electrochemical technique for measuring the current that flows in solution as a function of an applied voltage. The observed polarographic wave, resulting from the electrochemical response, depends on the way voltage is applied (linear sweep or differential pulse) and the type of electrode used. Usually a mercury drop electrode is used.
Chemistry Techniques, Analytical
Refractometry
Nephelometry and Turbidimetry
Chemical analysis based on the phenomenon whereby light, passing through a medium with dispersed particles of a different refractive index from that of the medium, is attenuated in intensity by scattering. In turbidimetry, the intensity of light transmitted through the medium, the unscattered light, is measured. In nephelometry, the intensity of the scattered light is measured, usually, but not necessarily, at right angles to the incident light beam.
Electromagnetic Radiation
Oxyquinoline
An antiseptic with mild fungistatic, bacteriostatic, anthelmintic, and amebicidal action. It is also used as a reagent and metal chelator, as a carrier for radio-indium for diagnostic purposes, and its halogenated derivatives are used in addition as topical anti-infective agents and oral antiamebics.
Biological Science Disciplines
All of the divisions of the natural sciences dealing with the various aspects of the phenomena of life and vital processes. The concept includes anatomy and physiology, biochemistry and biophysics, and the biology of animals, plants, and microorganisms. It should be differentiated from BIOLOGY, one of its subdivisions, concerned specifically with the origin and life processes of living organisms.
Electrochemistry
Computer-Assisted Instruction
Software
Electrochemical Techniques
Arsenic
A shiny gray element with atomic symbol As, atomic number 33, and atomic weight 75. It occurs throughout the universe, mostly in the form of metallic arsenides. Most forms are toxic. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), arsenic and certain arsenic compounds have been listed as known carcinogens. (From Merck Index, 11th ed)
Aquaglyceroporins
Arsenate Reductases
Oxidoreductases that specifically reduce arsenate ion to arsenite ion. Reduction of arsenate is a critical step for its biotransformation into a form that can be transported by ARSENITE TRANSPORTING ATPASES or complexed by specific sulfhydryl-containing proteins for the purpose of detoxification (METABOLIC DETOXIFICATION, DRUG). Arsenate reductases require reducing equivalents such as GLUTAREDOXIN or AZURIN.
Arsenic Poisoning
Disorders associated with acute or chronic exposure to compounds containing ARSENIC (ARSENICALS) which may be fatal. Acute oral ingestion is associated with gastrointestinal symptoms and an encephalopathy which may manifest as SEIZURES, mental status changes, and COMA. Chronic exposure is associated with mucosal irritation, desquamating rash, myalgias, peripheral neuropathy, and white transverse (Mees) lines in the fingernails. (Adams et al., Principles of Neurology, 6th ed, p1212)
Ion Pumps
Centrifugation
Process of using a rotating machine to generate centrifugal force to separate substances of different densities, remove moisture, or simulate gravitational effects. It employs a large motor-driven apparatus with a long arm, at the end of which human and animal subjects, biological specimens, or equipment can be revolved and rotated at various speeds to study gravitational effects. (From Websters, 10th ed; McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Sanitary Engineering
Ion-Selective Electrodes
Fluorides
Bodily Secretions
Geologic Sediments
A mass of organic or inorganic solid fragmented material, or the solid fragment itself, that comes from the weathering of rock and is carried by, suspended in, or dropped by air, water, or ice. It refers also to a mass that is accumulated by any other natural agent and that forms in layers on the earth's surface, such as sand, gravel, silt, mud, fill, or loess. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1689)
Fossils
Hydrology
Water Pollutants, Chemical
Modulation of distal colonic epithelial barrier function by dietary fibre in normal rats. (1/121)
BACKGROUND: Dietary fibre influences the turnover and differentiation of the colonic epithelium, but its effects on barrier function are unknown. AIMS: To determine whether altering the type and amount of fibre in the diet affects paracellular permeability of intestinal epithelium, and to identify the mechanisms of action. METHODS: Rats were fed isoenergetic low fibre diets with or without supplements of wheat bran (10%) or methylcellulose (10%), for four weeks. Paracellular permeability was determined by measurement of conductance and 51Cr-EDTA flux across tissue mounted in Ussing chambers. Faecal short chain fatty acid (SCFA) concentrations were assessed by gas chromatography, epithelial kinetics stathmokinetically, and mucosal brush border hydrolase activities spectrophotometrically. RESULTS: Body weight was similar across the dietary groups. Conductance and 51Cr-EDTA flux were approximately 25% higher in animals fed no fibre, compared with those fed wheat bran or methylcellulose in the distal colon, but not in the caecum or jejunum. Histologically, there was no evidence of epithelial injury or erosion associated with any diet. The fibres exerted different spectra of effects on luminal SCFA concentrations and pH, and on mucosal indexes, but both bulked the faeces, were trophic to the epithelium, and stimulated expression of a marker of epithelial differentiation. CONCLUSIONS: Both a fermentable and a non-fermentable fibre reduce paracellular permeability specifically in the distal colon, possibly by promoting epithelial cell differentiation. The mechanisms by which the two fibres exert their effects are likely to be different. (+info)Axon voltage-clamp simulations. I. Methods and tests. (2/121)
This is the first in a series of four papers in which we present the numerical simulation of the application of the voltage clamp technique to excitable cells. In this paper we describe the application of the Crank-Nicolson (1947) method for the solution of the parabolic partial differential equations that describe a cylindrical cell in which the ionic conductances are functions of voltage and time (Hodgkin and Huxley, 1952). This method is compared with other methods in terms of accuracy and speed of solution for a propagated action potential. In addition, differential equations representing a simple voltage-clamp electronic circuit are presented. Using the voltage clamp circuit equations, we simulate the voltage clamp of a single isopotential membrane patch and show how the parameters of the circuit affect the transient response of the patch to a step change in the control potential. The stimulation methods presented in this series of papers allow the evaluation of voltage clamp control of an excitable cell or a syncytium of excitable cells. To the extent that membrane parameters and geometrical factors can be determined, the methods presented here provide solutions for the voltage profile as a function of time. (+info)Axon voltage-clamp simulations. II. Double sucrose-gap method. (3/121)
This is the second in a series of four papers on the simulation of the voltage clamp of cylindrical excitable cells. In this paper we evaluate the double sucrose-gap voltage-clamp technique for the squid and lobster giant axons. Using the Crank-Nicolson method of solution of the cable equations and differential equations representing the voltage clamp circuit we studied the effect of length of the sucrose gap "node" on the voltage profile along an excitable cell during a simulated voltage clamp. The voltage gradients along the region of the cell within the node produce "notches" in the current recording as well as changes in the magnitude of the sodium and potassium current for a given voltage step. Our results show that good voltage clamp control requires node lengths less than one-half the axon diameter. (+info)Axon voltage-clamp simulations. A multicellular preparation. (4/121)
In this paper we extend the simulation of the voltage clamp of a single nerve fiber to a bundle of axons. These simulations included not only the description of the voltage clamp circuit and a single unidimensional cable to represent the preparation in the "node" region of a double sucrose gap used previously but also a series resistance and a shunt pathway. The output of the voltage control amplifier is applied across the membrane plus the series resistance, producing a voltage drop across the series resistance due to the current generated by the membrane in response to a depolarizing voltage step. Since the membrane current has an inward and an outward phase, voltage drops of opposite sign are produced across the series resistance. During the transient current and at all points along an axon, the potential deviation produced by the series resistance is opposite to the deviation produced by the longitudinal gradient. Only at a command potential equal to the sodium equilibrium potential, the membrane potential transiently matches the command potential. For the attempted voltage clamp of an axon, values of series resistance larger than 50 omega-cm2 allowed propagated action potentials in the membrane. In spite of the presence of propagated action potentials at the calbe membrane, the recorded current does not show "notches" and it has a phase of inward current and a phase of outward current. It is concluded that, in a multicellular preparation with series resistance, the recording of a square voltage pulse does not indicate voltage control of the transmembrane potential. The presence of a shunt pathway produces inaccurate values of current density. Neither series or shunt resistance produce "notches" in the current records. (+info)The interaction of DNA with dopamine by spectroscopic and electrochemical methods. (5/121)
It has recently been reported that dopamine may show some biological activities in antitumor and cell apoptosis. We have thoroughly investigated the interaction between dopamine and DNA by CD, UV, fluorescence and electrochemical methods. The results of spectroscopic measurements have indicated that a binding event occurs in a dopamine-DNA system. Besides the electronstatic interaction between a negatively charged DNA molecule and a positively charged dopamine molecule, other binding modes, such as hydrogen-bond and intercalation may also exist in this system. The interaction parameters, including the equilibrium constant and binding numbers, were estimated by an electrochemical method based on the redox current and formal potentials. Both of the two calculation methods showed that the 1:1 type of complex was formed in the dopamine-DNA system and that its equilibrium constant was about 5.85 x 10(6) M(-1). Based on the results of UV, fluorescence and electrochemical experiments in the present study, dopamine may be employed as an effective probe for a DNA assay. (+info)Spectroscopic and voltammetric study on the binding of aluminium(III) to DNA. (6/121)
Cyclic voltammetry (CV) and ultraviolet (UV) spectroscopy were used, for the first time, to study the interaction between aluminium(III) and calf thymus DNA under neutral pH conditions. Thus obtained data confirmed the existence of a relatively strong interaction between Al(III) and DNA. The binding site for aluminium(III) on DNA chains is not the bases, but the phosphate groups on the DNA backbones, the same as that for [Co(phen)3](3+/2+) that binds non-specifically and electrostatically to the deoxyribose phosphate backbone of DNA. When coexisting, Al(III) binds more favorably to DNA than [Co(phen)3](3+/2+), which implies the relatively strong binding of Al(III) to the phosphate backbone of DNA under neutral pH conditions. The nature of the binding of Al(III) to DNA is also discussed. (+info)Effect of polylysine on transformations and permeability of negative vesicular membranes. (7/121)
Small (40-60 nm in diameter) and large (300-350 nm) negative vesicles were complexed with a cationic polypeptide, poly-L-lysine (PL). Laser microelectrophoresis experiments showed that in small vesicles rendered anionic with the addition of cardiolipin (CL(2-)), only the CL(2-) in the outer leaflet is involved in the complexation with PL. Calorimetric and other data demonstrate that the binding of PL to the membrane surface causes domains ("rafts") of CL(2-) to form in the outer leaflet, and it is these domains that electrostatically bind the polymer. The kinetics of transmembrane permeation of doxorubicin (Dox, a fluorescent anti-tumor drug) was monitored with and without PL binding to the outer surface of the vesicles. It was found that PL mediates the permeation of Dox into the vesicle interior. In the absence of PL, the Dox molecule (possessing an amino group of pK(a)=8.6) binds to the anionic vesicles in the protonated form and, consequently, suffers an impaired mobility through the membrane. On the other hand, when the PL covers the vesicle surface, Dox passes though the membrane with greater ease. The effects of salt and polyanion on the stability of PL-vesicle complexes and the PL-mediated Dox permeation are also discussed. (+info)A disposable voltammetric cell for determining the titratable acidity in vinegar. (8/121)
A disposable voltammetric cell using three pencil leads as working, reference, and counter electrodes was developed for determining the titratable acidity, i.e. the acid content in vinegar. The materials of the pencil leads were graphite-reinforcement carbons (GRCs). A voltammetric determination of acid was made by measuring the reduction prepeak current of 3,5-di-t-butyl-1,2-benzoquinone (DBBQ) due to the presence of acids in unbuffered solution. The potential stability of the pseudo-reference electrode of GRC was examined. The prepeak current was found to be proportional to the acetic acid concentration from 0.05 to 2.7 mM with a correlation coefficient of 0.999. The cell-to-cell reproducibility for 1 mM acetic acid was evaluated with ten individual disposable cells. The RSD of the prepeak current and the SD of the prepeak potential were 2.56% and 0.008, respectively. The titratable acidity in five vinegar samples was determined by voltammetry using disposable cells and compared with that of the titratable acidity determined by the conventional potentiometric titration method. We then observed the results by both methods, and found a correlation coefficient of 0.972. As such, the voltammetry using disposable-cell required only one thousandth the volume of a vinegar sample for the titration method. The disposable cell was superior to the conventional electrochemical cell, in terms of facility, environment-friendly, and economy, and thus a sensor using the present cell would be useful for routine work in the quality control of vinegar. (+info)
Unease-gelatin interdigitated microelectrodes for the conductometric determination of protease activity
ALKALINE PHOSPHATASE RESEARCH: Alkaline phosphatase conductometric biosensor for heavy-metal ions determination
Conductometric Titration for Determination of Lomefloxacin Hydrochloride and Solubility Products of its Ion-associated Complex...
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Preparation of copper oxide nanowire-based conductometric chemical sensors - IREC
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Supersaturation
Conductometry Kohlrausch-cell, inductive measurements Electrolytic conductivity Gravimetry Densimeter Density Optics ...
Cryopreservation
Mazur P (July 1963). "Studies on rapidly frozen suspensions of yeast cells by differential thermal analysis and conductometry ...
Izaak Kolthoff
They included acid-base titrimetry, electrometric analysis and conductometry, potentiometry, electron transfer, gravimetric ... Konduktometrische Titrationen (1924) and Potentiometric Titrations (1926):Kolthoff began to use conductometry and poteniometry ...
Cetrimonium bromide
400 M-1. This value is calculated from Br− and CTA+ ion selective electrode measurements and conductometry data by using ...
List of MeSH codes (E05)
... conductometry MeSH E05.196.922.625 - neutralization tests MeSH E05.196.922.750 - potentiometry MeSH E05.196.922.875 - skin test ...
Conductometry
... is a measurement of electrolytic conductivity to monitor a progress of chemical reaction. Conductometry has ... Conductometry is often applied to determine the total conductance of a solution or to analyze the end point of titrations that ... As such, using conductometry to determine water purity, which is often used today to test the effectiveness of water ... Conductometry was further improved with the development of the glass electrode, which began in 1909. Conductometric titration ...
Conductometry | chemistry | Britannica
Conductometry: This is the method in which the capability of the analyte to conduct an electrical current is monitored. From ... Other articles where Conductometry is discussed: chemical analysis: ... In chemical analysis: Conductometry. This is the method in which the capability of the analyte to conduct an electrical current ...
Conductometry - Wikipedia
Conductometry is a measurement of electrolytic conductivity to monitor a progress of chemical reaction. Conductometry has ... Conductometry is often applied to determine the total conductance of a solution or to analyze the end point of titrations that ... As such, using conductometry to determine water purity, which is often used today to test the effectiveness of water ... Conductometry was further improved with the development of the glass electrode, which began in 1909. Conductometric titration ...
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Chromatography and conductometry, Biology tutorial
Chromatography and conductometry tutorial all along with the key concepts of Types of chromatography, How Gas Chromatography ... Works, High Performance Liquid Chromatography, Applications of chromatography, Applications of conductometry ... Chromatography and conductometry, Biology tutorial. Introduction:. Chromatography and Conductometry are separation and ... Conductometry:. One of the most significant features of electrolyte solution is their ability to carry electric current. ...
Supersaturation - Wikipedia
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Zeitschrift für Naturforschung C
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... binary non-aqueous solvents at different temperatures using a conductometry method. The conductance data show that the ... Keywords: conductometry; dimethylsulfoxide-acetonitrile binary media; p-isopropylcalix-[6]arene; Cs+ cation conductometry; ... binary non-aqueous solvents at different temperatures using a conductometry method. The conductance data show that the ...
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Předměty
8. Conductometry and diectrimetry. Two- and four-electrode conductometric cell, low- and high frequency conductometry. Direct ... conductometry, conductometric titrations. Contactless conductometry. Dielectrimetry, determination of components in binar ... conductometry and impedance measurements. Typical examples of applications. ...
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Applied Chemistry</span>
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Search | Britannica
Goldhammer, T (2014): Pore water chemistry of sediment core GeoB17314-1
Potentiometry1
- Instrumental Methods of Analysis: Basic principles, instrumentations and simple applications of conductometry, potentiometry, UV-vis spectro-photometry, analysis of water, air and soil samples. (indiaeducation.net)
Coulometry1
- Electrogravimetry, Coulometry, Conductometry. (vutbr.cz)
Amperometry1
- MultiBioPlat is a prototype biosensor platform which combines three types of transduction systems into miniaturized measurement cells: Fluorescence, Amperometry and Conductometry. (environmental-expert.com)
Conductivity2
- Conductometry is a measurement of electrolytic conductivity to monitor a progress of chemical reaction. (wikipedia.org)
- Conductometry encompasses methods in which the electrical conductivity of electrolytes (aqueous and nonaqueous solutions, colloid systems, melts, and solids) is measured ( see ELECTRICAL CONDUCTIVITY OF ELECTROLYTES ). (thefreedictionary.com)
Titrations2
- Conductometry is often applied to determine the total conductance of a solution or to analyze the end point of titrations that include ions. (wikipedia.org)
- KF titrations, and conductometry. (cecon.com)
Mixtures1
- The complexation reactions between Mg2+, Ca2+ and Sr2+ cations and dicyclohexyl-18-crown-6 (DCH 18C6) have been studied in acetonitrile-water binary mixtures at different temperatures by conductometry. (scienceq.org)
Term conductometry1
- In usual analytical chemistry practice, the term conductometry is used as a synonym of conductometric titration, while the term conductimetry is used to describe non-titrative applications. (wikipedia.org)
Spectroscopy2
- The obtained organosols were characterized by phase analysis light scattering, dynamic light scattering, transmission electron microscopy, diffusion-ordered spectroscopy of nuclear magnetic resonance, spectrophotometry and conductometry. (rsc.org)
- In the course of the research the scientists used such methods as nuclear magnetic resonance (NMR) spectroscopy and infrared spectroscopy, dynamic light scattering, conductometry (measuring of the solutions' electroconductivity), and viscometry (measuring of the fluid viscosity). (labmanager.com)
Measurements2
- Because conductometric measurements require the presence of ions, conductometry is not useful for the analysis of undissociated molecules. (britannica.com)
- The characterizations of the nanopores are performed by field emission scanning electron microscopy, replica technique and conductometry measurements. (tu-darmstadt.de)
Chemistry4
- Conductometry has notable application in analytical chemistry, where conductometric titration is a standard technique. (wikipedia.org)
- Chromatography and Conductometry are separation and analytical methods extensively utilized in chemistry and biological sciences. (tutorsglobe.com)
- Engberts, J.B.F.N., Hafner, K. & Hopf, H. En route to European journals of inorganic and organic chemistry. (rug.nl)
- Some applications of conductometry are discussed here, conductometry in analytical chemistry is used to measure the progress of chemical r. (pharmastuff4u.com)
Volumetry1
- Zinc and cadmium interaction with sodium 2,3-dimercaptopropane sulfonate in aqueous solution is studied by means of physicochemical analysis techniques (pH-metry, conductometry, viscosimetry, volumetry). (osti.gov)
Analytical methods1
- Conductometry includes both direct analytical methods (used, for example, in salinometers) and indirect analytical methods (for example, in gas analysis) using either direct or alternating current (low-or high-frequency current). (thefreedictionary.com)
Titration1
- It also includes chrono-conductometry and low-frequency and high-frequency titration. (thefreedictionary.com)
Different temperatures1
- The complexation reactions between the macrocyclic ionophore, p -isopropylcalix[6]arene and Cs + cation were studied in dimethylsulfoxide-acetonitrile (DMSO-AN) binary non-aqueous solvents at different temperatures using a conductometry method. (mdpi.com)
Electrolytes1
- Such transients can be measured non-invasively using DC conductometry, but the accuracy of this method requires precise characterization of the bulk RFB electrolytes. (aps.org)
Indirect1
- We used a combination of fluorescence microscopy (4′,6′-diamidino-2-phenylindole staining and in situ hybridization, for mixed-culture studies), ultrasonic removal of bacteria from surfaces, and indirect conductometry and found this combination sufficient to quantify bacteria on surfaces. (asm.org)
Systems1
- As such, using conductometry to determine water purity, which is often used today to test the effectiveness of water purification systems, began in 1776. (wikipedia.org)
Alternating current1
- Friedrich Kohlrausch further developed conductometry in the 1860s when he applied alternating current to water, acids, and other solutions. (wikipedia.org)
Potentiometry1
- What is the difference between Conductometry and potentiometry? (rehabilitationrobotics.net)
Conductance1
- The determination of the lead conductance value of hops, hop powders and hop pellets by conductometry. (brewup.eu)
Cell1
- Which cell is used in Conductometry? (rehabilitationrobotics.net)