Aloe, absorption

Table 5.5 Prominent peaks in the mass spectrum of aloe resin (see Figure 5.13), interpretation following the literature. The dyes are not detected as sodium adducts but as radical cations formed by direct absorption and ionisation of the laser energy...

The AFO/OH family form an important catalytic system and numerous recipes have been reported for preparing catalysts of differing reactivity and absorptive power. Additionally, the basic character of the surface diminishes and the acidic nature increases in the following series amorphous A1 oxide hydrate < y-AlO(OH) < q -A1(OH)3 < y-AFOs (pHofisoelectric points 9.45,9.45-9.40,9.20,8.00, respectively). 

AlO. Allan, J. E., The use of organic solvents in atomic absorption spectrophotometry. Spectrochim. Acta 17, 476-483 (1961). 

The anthraquinone group of laxatives includes senna, danthron, cascara, rhubarb and aloes. In the small intestine soluble anthraquinone derivates are liberated and absorbed. These are excreted into the colon and act there, along with those that have escaped absorption, probably after being chemically changed by bacterial action. 

AlO. Ando, A., Fuwa, K., and Vallee, B. L., Physical basis of atomic absorption spectrometry, II. Influence of temperature gradients on spatial distribution of neutral atoms in long path cells. Anal. Chem. 42, 818-825 (1970). 

The primary active ingredients of cascara sagrada include cascarosides A, B, C, and D, but barbaloin, chrysaloin, chryophanol, emodin, and aloe-emodin are also present (Tyler, 1994 Anonymous, 1996). The anthrone glucofrangulin is present in the cortex of the European species Rhamni frangula (De Witte, 1993). As with senna and aloe constituents, these anthrones produce an active secretion of water and electrolytes within the lumen of the small intestine. In addition, the anthrones inhibit absorption of water and electrolytes from the large intestine. This causes an increase in the volume of bowel contents, and strengthens the dilatation pressure in the intestine to stimulate peristalsis (Anonymous, 1996). 

With this technique it was also possible to look for appropriate buffer layers between the metal hydride and Pd to prevent interdiffusion and oxidation [83], In the case of La switchable mirrors it was found that an AlO layer with a very well defined thickness (between 0.9 and 1.2 nm) is able to inhibit Pd/La interdiffusion and oxidation of La without significantly hampering hydrogen absorption. 

Use of stimulant laxatives, such as aloe latex, may reduce the gastrointestinal transit time and thus reduce the absorption of orally administered drugs (Brinker 2001 De Smet 1993). 

The concentration of surface OH groups in y-ALOs was determined from the integral intensities of absorption bands voh in the region of 3650-3800 cirri using the integral absorption coefficient Ao = 5.3 cm/ rmol (Baumgarten et al., 1989). 

Figure 4. (Left panel) Absorption and PL spectra of DHLA-QDs and QDs conjugated with MBP-zb. Only one absorption spectrum is shown because all solutions have identical absorption spectra (same QD concentration in all samples). (Right panel) Variation of the PL total integrate intensity versus pH for DHLA-QDs and QD/MBP-zb conjugates. QD concentration was 150 nmol/L concentration of MBP-zb protein was 900 nmol/L (rath MBP-zb QD 6 1). Samples were excited at 500 nm with alO mm opticalpathlength (5).

Some drug absorption enhancers are capable of loosening tight junctions (zonula occludens) and thereby facilitate paracellular absorption of drug molecules and improve the bioavailability of active pharmaceutical ingredients with low membrane permeability. The penetration enhancers include chelating agents [e.g., ethylenediaminetetraacetic acid), toxins [e.g., zonula occludens toxin), plant-derived materials [e.g., aloe vera gel), and cationic polymers. Polycationic lipophilic-core dendrons, which form lipophilic ion-pairs with heparin, were studied as a system for oral delivery of heparin. ... 

The high-temperature flames, however, did not solve all the problems of atomic absorption spectroscopy for many elements. If excess oxygen is present in a flame, a significant fraction of certain metal elements is converted to oxides. If the oxide is particularly stable, it is not redissociated into atoms. Thus the refractory oxides, such as MgO, CaO, AlO, MoO, and others, resist decomposition even in high temperature flames. To inhibit formation of these oxides, it is possible to use a fuel-rich flame to produce a reducing ... 

AlO. Compare K jE/R to KV/L used in distillation, absorption, and stripping. Do these quantities have the same significance ... 

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