Numerical Differentiation
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Numerical simulation of a rocket motor with chemical reaction flow / Simulação numérica do escoamento em um motor foguete com reação química
This work presents a numerical simulation of the flow field in a propellant rocket engine chamber and exit nozzle using techniques to allow the results to be taken as starting points for designing those propulsive systems. This was done using a finite volume method simulating the different flow regimes which usually take place in those systems. As the flow f
Publicado em: 2000
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14. Stereological studies of differentiation in hamster cheek pouch epithelium: variations in the volume and frequency of mitochondria.
The present report describes quantitative studies of mitochondria from stratified squamous epithelial cells from hamster cheek pouch mucosa in differentiating compartments. Mucosa was processed for electron microscopy and, using strict sampling procedures, electron micrographs of epithelium from defined basal, spinous and granular strata were acquired. Using
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15. Inference from Inadequate and Inaccurate Data, II*
Having measured D numerical properties of a physical object E which requires many more than D parameters for its complete specification, an observer seeks to estimate P other numerical properties of E. A previous paper discussed how he can proceed when E is adequately described by one member mE of a Hilbert space [unk] of possible models of E and when all th
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16. Alternate-1 and Alternate-2 Orientations in Interchange (Reciprocal Translocation) Quadrivalents
The dynamic properties of the spindle, and published numerical data, argue that the differentiation of alternate-1 and alternate-2 orientations of an interchange quadrivalent is real and meaningful, contra Boussy (1982).
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17. Cellular fatty acid analysis as a potential tool for predicting mosquitocidal activity of Bacillus sphaericus strains.
Gas-liquid chromatography of fatty acid methyl esters and numerical analysis were carried out with 114 Bacillus sphaericus strains. Since only two clusters harbored mosquitocidal strains, this technique could be developed in screening programs to limit bioassays on mosquito larvae. It also allows differentiation of highly homologous strains.
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18. Numerical Diagnostic Key for the Identification of Enterobacteriaceae
A numerical diagnostic key for enteric organisms is described which permits the identification of typical strains and of biochemical variants with high accuracy. Unknown strains are inoculated into a basic set of five media which permit the testing of eight biochemical reactions. The positive reactions are assigned points, and the score of a strain is added
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19. Multicentric epidemiological study of Aspergillus fumigatus isolates by multilocus enzyme electrophoresis.
The genotypes of 63 isolates of Aspergillus fumigatus obtained from three hospitals in different geographical areas and of eight culture collection strains were determined by multilocus enzyme electrophoresis. Twelve of the 17 enzymatic loci studied were polymorphic, giving rise to 48 different electrophoretic types. The existence of fixed multilocus genotyp
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20. Use of PCR-Based Methods for Rapid Differentiation of Lactobacillus delbrueckii subsp. bulgaricus and L. delbrueckii subsp. lactis
Two PCR-based methods, specific PCR and randomly amplified polymorphic DNA PCR (RAPD-PCR), were used for rapid and reliable differentiation of Lactobacillus delbrueckii subsp. bulgaricus and L. delbrueckii subsp. lactis. PCR with a single combination of primers which targeted the proline iminopeptidase (pepIP) gene of L. delbrueckii subsp. bulgaricus allowed
American Society for Microbiology.
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21. Application of a numerical index of discriminatory power to a comparison of four physiochemical typing methods for Candida albicans.
Four typing methods for the strain differentiation of Candida albicans (morphotyping, resistotyping, extracellular enzyme production, and carbon source assimilation reactions) were compared on a single population of 100 strains. An index of discriminatory power was used to facilitate this comparison. Extracellular enzyme production had poor discriminatory po
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22. Selection of Characters for an Adansonian Analysis of Mycobacterial Taxonomy1
Tests which are most frequently employed to provide characters for numerical analysis of bacterial taxonomy provide little differentiation among the slow-growing members of the genus Mycobacterium. A special scheme was proposed to deal with this problem. Characters were based, to some extent, on quantitative reactions to tests, and were defined, for each tes
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23. Natural killer (HNK-1+) cells in Chediak-Higashi patients are present in normal numbers but are abnormal in function and morphology.
Children with the Chediak-Higashi (CH) syndrome are known to have abnormalities of natural killer (NK) cell function. We used the HNK-1 monoclonal antibody that reacts specifically with human NK and K cells to distinguish whether this abnormality was due either to a numerical deficiency of NK cells or a defect in their ability to function. In eight CH patien
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24. Polyacrylamide gel electrophoresis of isoenzymes from Entamoeba species.
In this preliminary report, we describe a polyacrylamide gel electrophoresis technique for the resolution of isoenzyme patterns of four isolates of Entamoeba histolytica and one isolate of Entamoeba coli. Our findings were similar to previous findings for three enzyme systems: maleic enzyme (malate dehydrogenase [EC 1.1.1.40]), hexokinase (EC 2.7.1.1), and p