Examination, indications

Hexahydrobenzoyloxodedelphonine acetate (VI) was dehydrogenated by selenium at 330° and gave as chief product a hydrocarbon, b.p. 90°/0-02 mm., whose composition, ultra-violet absorption spectrum and chemical properties, so far as examined, indicate that it may be a bicyclopentenobenzene and therefore in a different category from the phenanthrene hydrocarbons yielded by the atisine group of bases. 

Untersuchungs-arbeit, /. research work, -chemiker, m. research chemist, -labora-torium, n. research laboratory, -material, n. material for investigation or under investigation. -methode, /. investigational method, research method, -mittel, n. means of research or examination indicator, -raum, m. laboratory, -richtung, /. line or direction of investigation. 

Little data are available on hot corrosion behaviour. Figure 3.35 indicates maraging steel to have better resistance to air exposure at 535°C than a 5% Cr tool steel . Metallographic examination indicates that exposure to... 

This has received support from work with 0-labelled peroxide under conditions when O2 is evolved , but a stopped-flow examination indicated the immediate product to be at least 99% Fe -t-FeOH in contrast, reduction of HOCl and O3 gave significant quantities of the dimeric (FeOH)2 formed very probably as follows... 

A mixing tee for the hot and cold make-up hydrogen to a hydroprocessing unit leaked near the weld to the downstream piping. SEM examination indicated decarburization and Assuring along the internal surface of the tee. 

In the past year—to give you an example—the US has been flooded with small amphetamine tablets known as minibennies. Ballistics examination indicates that most of these tablets originate from three sets of punches and dies used on multiple punch tableting machines. To date, over 30 million minibennies have been purchased or seized. 

Aluminum scrap was added to a remelt furnace. An immediate explosion resulted. Later examination indicated there was foreign material in the scrap. Water may have been in a bottle whose pieces were recovered... 

In summary, the NMR data on the samples examined indicate that fluorine occupies the surface phase up to the order of 5 wt. % F, and forms a bulk phase of aluminum fluoride at higher concentrations of... 

Thus, following the lowest energy pathway between minima might require C3-03 bond rotation in 8. This cursory examination indicates that, while the location of energy minima may not be affected by non-anomeric hydroxyl conformations, the relative energies of these minima may indeed depend on these conformations. 

TNO has stated that the size, quality, completeness, and consistency of the database should be considered (Hakkert et al. 1996). Major aspects for the evaluation of the quality of the data supporting the NOAEL are (1) deviations from official guidelines, which are not properly substantiated, (2) number of animals used, (3) number of dose levels tested, and (4) adequacy of hematological, biochemical, and pathological examinations. Indications for doubts on the confidence in the database are (1) the absence of certain types of smdies, (2) conflicting results between studies, and (3) doubts on the reliability of the route-to-route extrapolation. However, consistency of results from different studies, consistency of animal and human data, and rehable mechanistic data are indicative for a high-confidence database. The default assessment factor for confidence of the database is 1. 

Histological examination of the liver reveals extensive cen-trilobular necrosis with loss of characteristic architecture of the hepatic cords. TEM examination indicated that both hepatocytes and hepatic endothelial cells were destroyed. The only alterations noted prior to cell rupture were slight mitocondrial swelling and slight cell swelling. Damaged cells had extensive fragmentation and vesiculation of the membrane (34). 

A 9-year-old boy is referred for evaluation of his hearing. A note from his school principal explains that he is inattentive in class. Initial physical examination indicates that he is at the 10th percentile for height, has coarse facial features, and is somewhat macrocephalic however, the remainder of the examination is within normal limits. Audiometry results confirm partial bilateral deafness, which is sensorineural in etiology. An IQ examination shows that he is in the 60th percentile for intelligence. Family history of mucopolysaccharidoses prompts specialty testing, which indicates elevated levels of dermatan sulfate and heparan sulfate in both a skin biopsy and urine sample. 

Fig- 9.16a). Other possible products from the self-cyclization or homodimerization of 19 or 20 were not found. Therefore, the formation of cross-linked 19-20 was not affected to any detectable extent by 23. Based on this result, it can be concluded that the sequence specificity shown in the formation of 19-20 was not due to the intermolecular association of 19 and 20. This conclusion was further verified by investigating the cross-linking of 1 and 2 at different concentrations in water containing 10% THF, from 0.05 mM to 5 mM for each strand. It was found that the sequence specifically cross-linked 19-20 was formed as the only product at the concentrations examined, indicating that intermolecular association played no role in influencing the observed product distribution. 

However, if the molecules of 5 had R alkyl chains longer than Me, the steric hindrance prevented 100% substitution and IR examinations indicated a 50% less derivatization. Moreover, XPS analysis showed that the surface is partly modified by substitution of hydrogen by halogen . In the case of 5 with X = I and to some extent X = Br, the formation of X radicals (besides 12) in a secondary reaction was reported . They participate in reactions analogous to equations 21 and 22b, but with X instead of 12, and attach to the Si surface improving the electronic passivation of the surface at defect sites, sterically inaccessible to 12. A possibility that surface dangling bonds may also appear in the charged states was discussed as well . 

In several instances 0.5-mm. thick sheets of Surlyn A were hung over concentrated aqueous hydrochloric acid in a desiccator for about one week, then dried in vacuum and irradiated. Infrared examination of thin films conditioned in this way for 3 days indicated little or no increase in crystallinity x-ray examination indicated the presence of small amounts of crystalline sodium chloride. 

Some investigators have found the enzyme primarily in the 100,000 X g supernatant fluid of extracts of rabbit brain (37), dog heart (42), rat liver (45), rat brain, and beef pineal gland (48). In contrast, other investigators have reported that the enzyme from beef heart (36) and rat brain (49, 50) is mostly particulate being present in all the primary fractions nuclear, mitochondrial, microsomal, and 100,000 X 9 supernatant. The reasons for these discrepancies are not entirely clear but most likely result from differences in fractionation technique. Evidence from density gradient procedures coupled with electron microscopic examination indicate that the enzyme is preferentially located at nerve... 

This examination includes numerous technical tests and investigations made with the object of determining the physico mechanical properties of the wares. The results obtained, together with those of the microscopic and chemical examinations, indicate if the material possesses the necessary characters for the required purpose and also allow of its value being established. This examination is carried out on a sample so chosen that it represents as far as possible the whole parcel. The tests made are numerous and only a few of the more important are given shortly here further details may be found in special books on the subject.1... 

The second drawback—that acid colors can be produced by processes other than simple proton addition—is more serious. The case of alumina is an example. Several of the indicators listed in Table I give faint acid colors with samples of pure, activated aluminas that have previously been shown to be inactive for an acid-catalyzed reaction such as cumene cracking (22). However, closer visual examination indicates that the acid... 

N-Methylflindersine (mp 83-85°), not previously recognized as a natural product, was isolated by a procedure involving chromatography. Spectral examination indicated its identity although no chemical transformations were reported. This plant had at one time been placed in Simarubaceae but the chemical constituents along with some taxonomic studies indicate the above relegation (162). 

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