Containers, degradability

In rabbits under light amytal anesthesia, chlordan has no direcr effect on the blood pressure, but produces a type of respiration having many characteristics in common with Cheyne-Stokes type. The generalized tremors, opisthotonus, tonic and clonic convulsions, produced by chlordan were decreased or abolished and respiration restored to normal by suitable injections of the sodium salts of amytal, phenobarbital, and pentothal. The LD60 of chlordan, which was about 20 mg. per kg. on intravenous administration to intact rabbits, was increased to about 60 mg. per kg. through the antidotal action of the barbiturates. An unidentified chlorine-containing degradation product with acidic properties was recovered from the urine of rabbits treated with chlordan. Approximately one third of its chlorine content was set free on hydrolysis at 100° C. with sodium hydroxide in either absolute alcohol or in water. 

Residual fuel oils and heavy marine fuels are composed of high-boiling-petroleum fractions, gas oils and cracked components. Residual and clarified oil streams from the FCC process can contain degraded alumina/silica catalyst fines. These 20- to 70-micron-diameter fines are known to contribute to a variety of problems in fuel injection and combustion systems. In marine engines, excessive injector pump wear, piston ring wear, and cylinder wall wear can all be due to the abrasive action of catalyst fines on these fuel system parts. 

Figure 4.3 shows the major parts of a recycle system. In practice, however, depending on municipal wastewater treatment systems to treat normal industrial effluents is impractical. The effluent may contain degradation-resistant chemicals... 

Many biological cells contain degradative enzymes (proteases) that catalyze the hydrolysis of peptide linkages. In the intact cell, functional proteins are protected from these destructive enzymes because the enzymes are stored in cell organelles (lysosomes, etc.) and released only when needed. The proteases are freed upon cell disruption and immediately begin to catalyze the degradation of protein material. This detrimental action can be slowed by the addition of specific protease inhibitors such as phenylmethyl-sulfonyl fluoride or certain bioactive peptides. These inhibitors are to be used with extreme caution because they are potentially toxic. 

J. Wang, J. Zima, N.S. Lawrence and M.P. Chatrathi, Microchip capillary electrophoresis with electrochemical detection of thiol-containing degradation products of V-type nerve agents, Anal. Chem., 76 (2004) 4721-4726. 

Recently, a nonspecific enzyme capable of degrading the precursor was extracted from Navel orange albedo (63). Nicol and Chandler (63) used a proximate assay for the degrading enzyme that is, the substrate was not identified except as a limonin precursor. The crude extracts from albedo contained degradation activity that was concentrated by 40 to 60% saturation with (NH J SO. Instability of the enzyme prevented further purification. 

Fig. 10.—Graphs of Nitrogen Concentration-Time for the Reaction of a Sugar with an Amino Acid.108 (Where x is the amount of Schiff base present at equilibrium y is the amount of Schiff base present at the stationary state z is the amount of nitrogen-containing degradation products formed between time <1 and <2. )...

If R = R (bifunctional polymers), reaction (119) does not affect the functionality but leads to the broadening of the molecular weight distribution, which is occurring anyway, due to the reversibility of propagation. Thus, several bifunctional polymers of 1,3-dioxolane were prepared and used, for example, to form the networks containing degradable and hydrolyzable polyacetal blocks (cf., Section IV.B). Reaction (119), however, may effectively prohibit the preparation of monofunctional polymers, e.g., macromonomers. Indeed, two recent attempts to prepare macromonomers by cationic polymerization of cyclic acetals led to nearly statistical... 

Table VII shows some results of the subfractionation (by particle size) of the amylose obtained from a single fractionation cycle. Increase of the starch concentration increases the average particle-size of the precipitated amylose fraction. Systems containing degraded starch (for example, soluble starch), irrespective of the rate of cooling, always yield amylose precipitates of very fine particle-size (about 0.2 micron).

Typical SEM photographs of fractured surface after bending tests are shown in Fig. 8 and Fig. 9. Shown in Fig. 8 is the surface of autoclave-cured PA3 composite. Fig. 9 shows the surface of water-cured PA3 composite. In the case of water-cured composites, there remained many sound GF compared with autoclave-cured composites that mostly contain degraded GF-like vague materials. 

Diethyl methylphosphonate 0,0 -Diethyl methylphosphonate C5H13O3P 683-08-9 Present in tonne containers, degradation product and impurity... 

EJ. Goethals, et al., Synthesis of polymer networks containing degradable polyacetal segments. Abstr. Pap. Am. Chem. Soc. 1993, 205, 457-POLY. 

Lysosomes contain degradative enzymes that hydrolyze unwanted cellular molecules. Lysosomal enzymes reach the lysosomes via the Golgi. In the case of some lysosomal hydrolases, the Golgi adds a specific sugar residue, mannose-6-phosphate, to the enzymes which acts as a marker for lysosomal transport. Loss of the enzyme that adds mannose-6-phosphate gives rise to I-cell disease, a genetic abnormality that is usually fatal during childhood. 

Alliin, the major compound in Allium sativum and A. ursinum, is unstable in water extract.s. The enzyme alkykulphinate lyase (allinase = allinlyase) splits alliin to allidn, which it,self generates further sulphur-containing degradation or transformation products (e.g. ajoenes). 

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