Milligram quantities

In either case, ion-exchange or solvent extraction techniques are needed to separate the element and, at best, it can be produced in no more than milligram quantities. Large-scale use is therefore impossible even if desired. 

Recently, the separation of some milligram quantities of terbutaline by classical gel electrophoresis has been reported [194]. A sulfated cyclodextrin impregnated on the agarose gel was used as a chiral selector and the complete resolution was achieved in 5 h. Analogously, small amounts of enantiomers can be isolated using thin-layer... 

Interest in this development among organic chemists was minimal. Diborane was a chemical rarity at the time, available only in milligram quantities through complex procedures. 

In this review I have traced the experiences of my research associates and myself as we explored the role of boranes in chemistry. Initially diborane was a very rare substance, made in milligram quantities in only a few laboratories throughout the world and explored purely for its scientific interest. 

All researchers involved in natural and life sciences who wish to isolate or purify microgram or milligram quantities of a given compound but, for whatever reason. 

In order to utilize TLC on preparative scale, microgram amounts of an analyte are separated from milligram quantities of another analyte from their mixtures. The results are summarized in Table 14.1 and Table 14.2. At higher loading of an analyte, separation possibilities are reduced owing to the formation of diffused spots. 

Weigel, F. The Isolation of Americium 241 in 100 Milligram Quantities from... 

An apparatus to fractionate size-selectively small quantities (sub-milligram quantities of nanoparticle material) is presented in Figure 2.4b [19]. This apparatus consists... 

Kigawa, T., Yabuki, T., Yoshida, Y. et al. (1999) Cell-free production and stable-isotope labeling of milligram quantities of proteins. FEBS Letters, 442 (1), 15-19. 

Zhang, D., Hanson, R., Roongta, V. et al. (2006) In vitro and in vivo metabolism of a gamma-secretase inhibitor BMS-299897 and generation of active metabolites in milligram quantities with a microbial bioreactor. Current Drug Metabolism, 7, 883-896. 

To obtain milligram quantities of mRNA the previous in vitro transcription reaction is scaled up to a volume of 6 or 12 ml, depending upon the need. 

Static 75As NMR of the CT in powdered films of Al Ga As has been used to obtain information about possible ordering in this alloy. The milligram quantities used were obtained by an epitaxial lift-off process from the MOVPE growth substrate and subsequent pulverization. Signals from 75As[A14] and 75As[Ga4]... 

Particulate properties are defined as those material characteristics which theoretically could be determined by the analysis of a small number of particles. Since the sample requirements for these assay methods are extremely modest, these properties can be investigated as soon as a drug candidate is available in milligram quantities. 

In contrast, the direct detection technique for 14C can count approximately one percent of the 14C atoms that are present in a 200 pg sample with virtually zero background in times that are of the order of a few hours. Thus, for milligram quantities of carbon, the improvement in sensitivity of direct counting over radioactivity is of the order 7.2 x 10s. 

Selective transfer of material in sub-microgram to milligram quantities between a solid sorbent and a liquid phase separations depend on different relative affinities for the two phases based on adsorption, size or charge selectivity achieved by pH control, solvent composition and surface chemistry of the sorbent. 

Several calculation methods for establishing reaction kinetics from the scanning DSC results are discussed in the literature [91-97]. Kinetic constants can be obtained from scanning DSC tests under favorable circumstances that include (1) the availability of a sample that even in milligram quantities is truly representative of the process material, and (2) kinetics that are uncomplicated by multiple reactions or by the presence of autocatalysis or inhibitor effects. 

Milligram quantity SiNW have been obtained, although no stand-alone materials have been generated for easy handling. In general, nanowires so produced are attached to the substrate, and removal has been difficult or nearly impossible due to the small quantities available. 

TABLE 7 Amount of Cephalosporin Residue on Surfaces Which Were Exposed to Milligram Quantities of Cephalospsorin and Cleaned... 

Most of the radioactive actinium isotopes that are produced in nuclear reactors are in milligram quantities. There are not many common compounds. 

Compound 15 has been synthesized in milligram quantities which is an inadequate amount for azidization and the process 13 —> 14 —> 15 —> 16 —> 17 will be repeated. 

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