Absorption absorbers

Absorbierbarkeit, /. absorbability, absorbieren, v.t. absorb.—absorbierend, p.a. absorbent, absorptive. — absorbierendes Mittel, absorbent, absorptive. 

Aufnahme-fahigkeit, /. absorbability, absorptivity, absorbing power capacity. -ge-Bchwindigkeit, /. absorption rate, -kolbeu, m. absorption flask, -pipette,/, a pipet calibrated to take up a definite volume. Cf. Ausflusspipette. -vermogen, n. absorptive power. 

This process selectively removes a certain gas from a gas mixture using a liquid absorbent. In the refining industry, this process is used extensively to free the product gas streams from acid gases (mainly H2S) either by using a physical or a chemical absorbent. Absorption of acid gases from natural gas are discussed in Chapter 1. 

As a generalization, to be orally well absorbed a compound must be soluble in the contents of the gastrointestinal lumen [4]. Solubility in aqueous buffer is commonly used as a simpHfying surrogate for intestinal content solubility. There are rare exceptions to the principle that to be absorbed a compound must be soluble. SoHd particles, e.g. starch, can be absorbed. Absorption of very small quantities of even biologically very large compounds can occur via lymphoid tissue, e.g. orally active vaccines. Very hpophihc basic compounds, e.g. certain antimalarials, can be absorbed via the intestinal lymphatics and dehvered directly to the heart... 

Mass spectrometry detection gained the acceptance of bioanalytical scientists primarily based on its higher selectivity compared to detection that relies on UV/visible absorbance. Absorption spectra of aqueous solutions usually appear as broad absorbance bands. The selectivity provided by UV/visible absorbance for a colorless analyte is usually very low. To detect a colorless analyte, a wavelength setting below 210 nm is usually used. UV absorbance in this region is not specific because most compounds containing hetero-atoms and multiple bonds absorb UV below 200 to 210 nm. 

MOLAR ABSORPTION COEFFICIENT ABSORPTION SPECTROSCOPY ABSORPTION SPECTROSCOPY ABSORPTIVITY ABSORBANCE ABSORPTION COEEEICIENT BEER-LAMBERT LAW ABSORPTION SPECTROSCOPY ABSTRACTION REACTION Abzyme,... 

Oral - Baclofen is rapidly and extensively absorbed. Absorption may be dose-dependent, reduced with increasing doses. Peak serum levels are reached in about 2 hours half-life is 3 to 4 hours. It is excreted primarily by the kidney in unchanged form with intersubject variation in absorption or elimination. 

Sodium valproate is converted to valproic acid in the intestine and the acid is absorbed. Absorption may be delayed by food or by enteric-coated tablets. Valproic acid has a low volume of distribution and high plasma protein binding. In the elderly there is a risk for increased free valproic acid concentrations requiring lower doses and plasma concentrations at the lower therapeutic range. However it should be realized that these plasma concentrations do not correlate very well with the therapeutic or toxic effects and careful observation for symptoms is mandatory. 

Pharmacokinetics Ultramicrosize is almost completely absorbed. Absorption is significantly enhanced after a fatty meal. Extensively metabolized in liver. Minimal excretion in urine. Half-life 24 hr. 

Pharmacokinetics Topical podophyllum is systemically absorbed. Absorption may be increased if applied to bleeding, friable, or recently biopsied warts. 

Hydration of Olefins. The earliest and still the largest production of chemicals from petroleum hydrocarbons was based on the hydration of olefins to produce alcohols by the employment of sulfuric acid. The addition of olefins to sulfuric acid to form alkyl sulfates and dialkyl sulfates takes place on simple contact of the hydrocarbons with the acid. To keep down polymerization and isomerization of the hydrocarbons, the temperature is kept relatively low, usually below 40° C. and commonly considerably lower than that (18). The strength of the sulfuric acid used depends on the olefin to be absorbed. Absorption of ethylene requires an acid concentration higher than 90%, whereas propylene and butylenes are readily absorbed in 85% acid or less. The alkyl and dialkyl sulfate solutions, on dilution and heating, are hydrolyzed to the alcohols plus small amounts of by-product ethers. After distilling off the organic products, the dilute sulfuric acid is reconcentrated and re-used. 

Absorption is described by determining the rate constant of drug passing into the bloodstream at successive time intervals after administration. Residues may be found in tissues after some or all of the drug has been systemically absorbed. Absorption is influenced by the properties of cell membranes, the physicochemical characteristics of the drug, and the route of drug administration (1). 

Absorption(see also Adsorption) is an act or process of taking up (incorporating) gases, liquids or solids inside a liquid or solid substance which may be called the "absorbent" Absorptions may be classed principally as physical, chemical, thermal (radiation), electrical and physiological. Only the first two are treated here... 

Absorption The assimilation of a solute, gas, or liquid into the interior of a solid material, an absorbent. Absorption may include the migration of solutes into internal pores or the migration or exchange of atoms within the crystalline structure of a mineral. Some researchers use the generic term sorption to refer to a natural or artificial process where both absorption and adsorption may be involved or if absorption and adsorption cannot be distinguished (compare with adsorption and sorption). 

In spectroscopic experiments, radiation is absorbed (absorption spectra) or emitted (emission spectra). The frequency of absorption, or emission, is a manifestation of transitions occurring within the molecule, and the frequency of a line in the spectrum is related to the energy change as the molecule moves from one energy state to another. 

Hu, C., Muller-Karger, F. E., and Zepp, R. G. (2002) Absorbance, absorption coefficient and apparent quantum yield A comment on common ambiguity in the use of these optical concepts. Limnol Oceanogr. 47,1261-1267. 

The aim of absorption is to purify gas, recover useful material, remove harmful material, and so on. In absorption, a solute or multiple solutes are dissolved in liquid by contacting gas and liquid (absorbent). Absorption is classified into two groups ... 

Chapter 3 describes the theory of electronic spectra of transition metal ions. The three characteristic features of absorption bands in a spectrum are position or energy, intensity of absorption and width of the band at half peak-height. Positions of bands are commonly expressed as wavelength (micron, nanometre or angstrom) or wavenumber (cm-1) units, while absorption is usually displayed as absorbance, absorption coefficient (cm-1) or molar extinction coefficient [litre (g.ion)-1 cm-1] units. 

Photostabilization with Ultraviolet Absorbers. Absorption of ultraviolet light in the region 2900-3900 A. (290-390 m/x) results in the yellowing and loss in physical-mechanical properties of most polymers containing aliphatic C—H bonds. This degradation is usually a combination of ultraviolet absorption and oxidative attack (21). 

NAME Absorbance Absorption factor Angle of optical rotation Angular frequency Emissivity, emittance Frequency... 

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