Laboratory report preparation tables

Both commercial and laboratory-synthesized polymers were used. Those made in the laboratory were generally prepared by solution polymerization, refluxing commercially available monomers in toluene using benzoyl peroxide as the catalyst. Other preparations were made in which azo-bis-isobutyronitrile (AIBN) was used as initiator, ethanol was employed as the refluxing medium, and monomers were especially synthesized in the laboratory. These variations in preparative procedure did not significantly affect the ranking of the polymers with respect to their tendency to crosslink, as reported in Table I. 

As indicated, a number of laboratories got into the process of purifying the components of nitrogenase, so it is difficult to credit any particular laboratory with first success in the endeavor In 1972,Tsoetol. [22] reported purification of dinitrogenase and dinitrogenase reductase to the highest specific activities reported up to that time. Preparations from different organisms require modification of the techniques. Winter and Burris [23] reported a table of activities of components prepared up to 1976. 

The data in Table 2.2 are for natural samples. It is notoriously difficult to prepare and maintain a clean solid surface, since any freshly created surface quickly becomes contaminated with adsorbed species even with a rather good laboratory vacuum. Any naturally occurring solid material must be considered to have a surface extensively populated by adsorbed atoms and molecules rather than a pristine surface. Such surfaces are what are examined in most laboratory experiments (e.g., those reported in Table 2.2), and, of coruse, just such surfaces are geochemically relevant for noble gas adsorption. It is interesting to note, however, that in other situations, noble gas adsorption can be rather a stronger effect. Thus, for example, Bernatowicz et al. (1983) examined Xe adsorption on a vacuum-crushed lunar rock and concluded that a small part of the freshly created surface had an adsorption potential as high as 14 kcal/mole but that in a few days at 10 8torr this surface was rendered inaccessible to Xe by other chemical species that were better competitors for the sorbent surfaces. 

A table is often the most appropriate way to present numerical data in a concise, accurate and structured form. Laboratory reports and project dissertations should contain tables which have been designed to condense and display results in a meaningful way and to aid numerical comparison. The preparation of tables for recording primary data is discussed on p. 67. 

Values of total metal dispersion of flesh and regenerated catalysts are reported in Table 1. It can be seen that the rejuvenation treatment improved the metal dispersion of the catalysts. The dispersion values of the catalysts subjected to a single buming-off step (no rejuvenation) are about 30-35 % for all the samples studied (results not shown). To further confirm this behavior some additional runs were perfcnmed using cyclohexane dehydrogenation as a test reaction of the activity of the metallic sites (11). A firesh laboratory prepared Pt-Re/AbOs... 

The stereospecific distribution of fatty acids in TAG molecules of DHA, EPA and EPA+DHA-enriched structured lipids synthesized in our laboratory was determined. Tables V and VI report the positional distribution of fatty acids in structured lipids examined. The results of this study showed that DHA was randomly distributed over all three positions (34.6% at snA 33.5% at sn-2 and 35.9% at snA>) of the TAG molecules of DHA-enriched borage oil (Table V). In DHA-enriched evening primrose oil, however, this fatty acid was mainly occupied by the sn 2 position (38.2%), followed by snA (33.1%) and sn- (24.5%) positions (Table VI). It should be noted that these DHA-enriched structured lipids were prepared using Novozym-435 from Candida antarctica as the biocatalyst. The positional specificity of Novozym-435 depends on the type of substrates used in various reactions. In some reaction systems, this enzyme behaves as a nonspecific lipase whereas in other systems it exhibits 5W-1,3 regiospecificity (77). Based on the reaction conditions enq)loyed in this study, Novozym-435 functions as a nonspecific lipase. 

The procedure described here for the preparation of succinimide silver salt is a modification of one reported for the formation of the silver derivative of maleimide. The alkylation step is modeled after the procedure of Comstock and Wheeler/ who prepared 2-ethoxypyrrolin-5-one in unspecified 3deld, and is an improvement over a later procedure developed in the laboratories of the submitters/ The general scheme has been successfully applied to the preparation of a variety of 2-ethoxypyrrolin-5-ones (Table 1) as well as 6-ethoxy- and 6-propoxy-4,5-dihydro-2(3H)-pyridone from the corresponding five- and six-membered cyclic imides/... 

From the table it is clear that the synthesis has not proved useful except in the preparation of substituted quinolizinium compounds having at least one of its substituents at position 2. Beaman (51TH21000), in Woodward s laboratory, did succeed in obtaining some unsubstituted quinolizinium salts but the yields were reported to be very poor. 

The number of position isomers possible for a given formula rapidly increases with the increasing number of carbon atoms, as can be seen from the number of theoretically possible structures of formula CnH2n+2 up to n = 10 given in Table 2-3. In 1946, it was reported that all of the 75 compounds with values of n = 1 to n = 9 had been prepared in the laboratory. Before we can begin to discuss the chemistry of these compounds it is necessary to know how... 

Structural Significance. Where possible, the types of ions causing the empirical formula shown are postulated, and the abundant compound types found are tabulated separately. The justifications for many such structural classifications are due to careful correlations of spectra that have been published by a variety of authors. No attempt has been made to give proper creditor reference to this vital previous work. Such an attempt would seriously complicate the table, and it was also impossible to give proper credit in every case. The author found most helpful a number of unpublished correlations which had been prepared informally by coworkers in the Dow laboratories. In addition, a sizable number of interesting structure-spectral relations were found which are reported for the first time in this table. The theoretical implications of these new correlations will be discussed in separate publications. 

With the exception of stilbene, all organic compounds listed in Table I (samples 14 to 28) were either obtained commercially or prepared by scientists at the USDA Forest Service, Forest Products Laboratory using well-established methods. Purchased chemicals were from both Aldrich Chemical Co., Milwaukee, Wisconsin, and Fluka Chemical Corporation, Ronkonkoma, New York. The Raman data for stilbene were taken from the literature [17]. Whenever the purity of a compound was in doubt, it was checked by gas chromatography-mass spectrometry. The Raman spectra reported here are from compounds that were more than 99% pure. 

The method proposed was checked by analysing some seawater and sediment reference samples prepared by the IAEA Marine Radioactivity Laboratory (Monaco) for intercomparison programmes. The values reported by IAEA and the experimental values obtained here are compared in Table 4.9 the agreement is fairly good. 

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