Silica analyses

Bulk Samples Bulk samples must be submitted for all silica analyses. They have two purposes (1) For laboratory use only, to confirm the presence of quartz or cristobalite in respirable samples, or to assess the presence of other substances that may interfer in the analysis of respirable samples. (2) To determine the approximate percentage of quartz (or cristobalite) in the bulk sample. A bulk sample submitted "for laboratory use only" must be representative of the airborne free silica content of the work environment sampled otherwise it will be of no value. The order of preference for an evaluation is ... 

The amount of silica present in the silicon carbide depends upon the SiC particle sizes, these being 0.5 pm, 3 pm, and 5 pm. Washing the SiC with HF removed most of the silica, resulting in soluble-silica analyses of 0.89, 0.10, and 0.05 weight percent respectively, shown in Fig. 8. 

Silica analyses were made on an automatic analyzer using a modification of the method of Mullin and Riley (29). Chloride analyses were also made on the automatic analyzer, using the method of O Brien (30). Conductivity measurements usually were made on the pressure-filtered... 

Bulk Samples Bulk samples must be submitted for all silica analyses. 

Silica analysis of water, 26 39 Silica-based glass fibers fabrication of, 77 136-137 transparency of, 77 132 Silica brick, ASTM classifications and specifications for, 27 509 Silica components, production of, 23 56 Silica fibers... 

The stem-loop structure in the noncoding 3 region of selenoprotein mRNAs has also been termed a SECTS element in mammals although it has a different overall structure. ° In silica analysis of the human genome sequence, using this consensus SECTS element along with the presence of the characteristic UGA codon within an exon, has led to the discovery of several new selenoproteins, including a selenium-dependent methionine sulfoxide reductase. It has been shown that a specific complex exists for selenoprotein synthesis that shuttles between the nucleus and the cytosol. This possibly protects the preformed complex for nonsense-mediated decay to allow for more efficient selenoprotein synthesis. The specific tRNA needed for selenocysteine... 

Two additional types of methyltransferase domains have been identified in NRPSs. Yersiniabactin synthetase contains a carbon-MT domain within a Cy-MT-PCP-TE module. This domain methylates at the a-carbon of an intermediate thiazoline ring. The melithiazol synthetase utilizes an MT domain in trans to form a methyl ester at the C-terminus of the natural product. Recent in silica analysis of MT domains from secondary metabolite biosynthetic pathways has revealed the boundaries of these domains and suggests that they are typically approximately 200 amino acids in length, much shorter than previously thought. The results of this study by Mohanty and coworkers allow for the accurate prediction of N-, C-, or 0-MT activity through sequence analysis. " ... 

The second approach necessitates a mechanism to identify compounds or chemical series from a project that enter the screening cascade. These triggers may include target-related information, previous experience and in silica analysis of compounds. 

Table I lists several XRD analytical methods recently developed in the NIOSH laboratories. For each analyte, the analytical range, detection limit and analytical precision are listed. The method numbers refer to the NIOSH Manual of Analytical Methods (2.). As indicated in the table, there are several NIOSH methods available for free silica analysis. Method No, P CAM 109 incorporates the internal standard approach as developed by Bumsted (3.), The other two methods S-315 and P CAM 259 are based on the substrate standard method. The major difference between the two is the direct sampling on silver membrane filters (S-315). This paper will address the various methods of quantitation, sample collection and procedures for matrix absorption corrections that have been used in this laboratory for the analysis of crystalline particulate contaminants in the workplace.

Gleeson, M. P. Plasma protein binding affinity and its relationship to molecular stmcture an in silica analysis. J. Med. Chem. 2007,50,101—112. 

Kosmulski, M., Adsorption of cadmium on alumina and silica Analysis of the values of stability constants of surface complexes calculated for different parameters of triple layer model. Colloids Surf. A, 117, 201, 1996. 

VIII. Further Evidence for Possible Functional hnphcations of Siahdases IX. /n silica Analysis of Siahdase Gene Expression Patterns Amino Acid Sequence Variants in Human Siahdases Siahdases in Teleosts... 

Although in silica analysis of large-scale gene expression data offers some interesting clues about the biological relevance of sialidases in different tissues and cell types, there remains of course the need of more specific and deeper studies, both at the RNA and at the protein level, to better define the role of these enzymes in health and disease. 

T. Hanai, Quantitative in silica analysis of the specificity of graphitized (graphitic) carbons, Adv. Chromatogr., 2011, 49, 251-284. 

T. Hanai and H. Homma, Quantitative in silica analysis of the selectivity of graphitic carbon synthesized by different methods, Anal Bioanal. Chem., 2008, 390, 369-375. 

The coefficients of the individual groups were elose to 1. The order of the MIFS values was alltyl alcohols > alltyl benzenes > PAHs > alkanes. If the relationship between alkane log k values and their MIFS values is considered as the standard for in silica analysis and the retention is based on a hydro-phobic interaction, the retention of other types of eompounds should follow the relationship of the alkanes. The retention strength was as follows alkanes > PAHs > alkyl benzenes > alkanes, based on the MI energy values. The van der Waals energy values support the strength of hydrophobic retention. If their solvation mechanisms are the same, all eompounds should... 

Lee J, Yun H, Feist AM, Palsson BO, Lee SY. (2008). Genome-scale reconstruction and in silica analysis of the Clostridium acetobutylicum ATCC 824 metabolic network. Appl Microbiol Biotechnol, 80, 849-862. 

Fischer, G.N. Gerri, R. Costa, E.P. Bacci Jr., M. (2008). SATEComp a Tool for in Silica Analysis of Transposable Elements, Proceedings of World Academy of Science, Engineering and Technology, Vol. 34, October, pp. 878-882. 

Continue the in silica analysis process until an optimal balance between diversity and drug-likeness is achieved (see Note 4). 

In order to assess the potential toxicological effects of onchidal from a predictive standpoint, the author subjected the two-dimensional molecular structure of onchidal (1) to an in silica QSAR computational analysis. Details regarding the approach of the software, including procedures and model building methods, have been described in recent publications (e.g., Choi et al., 2013 Valencia et al., 2013). The in silica analysis of the molecular structure of onchidal produced predictive information on nonclinical toxicities. The computational QSAR models included bacterial mutagenicity (Salmanella h/pln/murium mutagenicity (Ames) assay), and phospholipidosis (Table 30.3). 

Some LAB species cannot truly convert citrate into pyruvate. Instead, the CitT transporter genraates succinate via malate and fumarate. Furthermore, the complete tricarboxylic acids (TCA) pathway has recently been identified in the Lact. casei genome using in silica analysis (Dfaz-Muniz et al. 2006). In this LAB species, the dominant end-products of citrate metabolism wctb acetic acid and L-lactic acid at both excess and limiting amounts of carbohydrates. Trace amounts of D-lactic acid, acetoin, formic acid, ethanol, and diacetyl confirm OAD activity however, succinic acid, malic acid, and butanendiol were not observed (Dfaz-Muniz et al. 2006 Mortera el al. 2013). 

Koopal and co-workers [186] have extended this thermodynamic analysis to investigate the competitive wetting of a solid by two relatively immiscible liquids. They illustrate the tendency of silica to be preferentially wet by water over octane, a phenomenon of importance in oil reservoirs. 

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