Logarithms
Mostrando 25-36 de 47 artigos, teses e dissertações.
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25. Enzyme-linked immunosorbent assay for measurement of antibody against cytomegalovirus and rubella virus in a single serum dilution.
Enzyme-linked immunosorbent assays (ELISA) were developed for quantifying cytomegalovirus (CMV) and rubella antibodies using a single serum dilution (1/800) in conjunction with a standard curve. A near linear relation was found between the logarithms of absorbance values of sera at a dilution of 1/800 and the titres as determined by an end point dilution ELI
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26. Manipulation of the N-alkyl substituent in amodiaquine to overcome the verapamil-sensitive chloroquine resistance component.
Aminoquinoline resistance correlates with lipid solubility at pH 7.2. Consequently, the in vivo dealkylation of amodiaquine, to the less lipid-soluble desethylamodiaquine, is a likely contributor to therapeutic failure in vivo. Therefore, 4-aminoquinoline drugs with lipid solubilities similar to that of amodiaquine, but which are not subject to side chain mo
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27. Reduction of nitroaromatic compounds mediated by Streptomyces sp. exudates.
Exudates from Streptomyces griseoflavus Tü 2484 effectively mediated electron transfer between hydrogen sulfide and various nitrobenzenes. In general, pseudo-first-order kinetics were observed, except for the initial phase of the reaction at higher pH values. Under fixed pH and Dh conditions, linear free energy relationships were found between the logarithm
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28. Partitioning of a polymer into a nanoscopic protein pore obeys a simple scaling law
The dependence of the rate on polymer mass was examined for the reaction of four sulfhydryl-directed poly(ethylene glycol) reagents with cysteine residues located in the lumen of the staphylococcal α-hemolysin pore. The logarithms of the apparent rate constants for a particular site in the lumen were proportional to N, the number of repeat units in a polyme
The National Academy of Sciences.
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29. Breath sounds in the clinical assessment of airflow obstruction.
In a group of 34 inpatients showing varying degrees of airflow obstruction we studied the relationship between breath sound intensity (BSI) and abnormalities of lung function. The BSI was evaluated by chest auscultation to provide a score, in a manner similar to that described by Pardee et al. (1976), and was found to correlate closely with indices of airflo
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30. Molecular mobility in the cytoplasm: An approach to describe and predict lifespan of dry germplasm
Molecular mobility is increasingly considered a key factor influencing storage stability of biomolecular substances, because it is thought to control the rate of detrimental reactions responsible for reducing the shelf life of, for instance, pharmaceuticals, food, and germplasm. We investigated the relationship between aging rates of germplasm and the rotati
The National Academy of Sciences.
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31. Inhibition of influenza virus replication by phosphorothioate oligodeoxynucleotides.
Oligodeoxynucleotides (ODNs) were synthesized and tested for their antiviral activity against influenza viruses. ODNs corresponded to the polymerase PB1 gene of either influenza A/WSN/33 virus or influenza C/JJ/50 virus. All compounds were 20 nucleotides long, including control ODNs containing mismatches. The phosphodiester ODNs (O-ODNs) failed to inhibit re
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32. A segmental nearest neighbor normalization and gene identification method gives superior results for DNA-array analysis
An intuitive normalization and gene identification method is proposed. After segmentation of the entire expression range into intensity intervals, the mean and standard deviation of the logarithm of expression ratios are calculated for each interval using the nearest neighbor genes. Genes with high differential expression are excluded from these calculations
The National Academy of Sciences.
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33. Lung function reference values in Singaporean children aged 6-18 years.
BACKGROUND--A study was undertaken to produce reference values of lung function in Chinese children and a means of calculating adjusted standard deviation scores of lung function for Malay and Indian ethnic groups. METHODS--A cross sectional study of lung function (forced expiratory volume in one second and forced vital capacity) measured with a Jaeger spiro
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34. Energetics of the initial phase of adhesion of Streptococcus sanguis to hydroxylapatite.
The initial adhesion of Streptococcus sanguis 10556 to artificial salivary pellicle and to bare hydroxylapatite was studied at several temperatures between 18 and 37 degrees C. When the natural logarithms of rate constants for adsorption and desorption were plotted against reciprocal temperatures in Arrhenius plots, curved lines were obtained, indicating tha
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35. Transfer activity coefficients between water and methanol of complexes of some univalent and barium ions with dibenzocryptand 2.2.2, cryptand 2.2.2, and 18-crown-6
Stability constants, KfLMn+ (in which L = ligand and Mn+ = metal ion), of complexes of sodium, potassium, silver, thallium(I), and barium with dibenzocryptand 2.2.2 were determined at 25°C in water and methanol. Also determined were transfer activity coefficients between methanol and water of two ligands, dibenzocryptand 2.2.2 and 18-crown-6. From these dat
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36. Development and Evaluation of a Model Predicting the Survival of Escherichia coli O157:H7 NCTC 12900 in Homemade Eggplant Salad at Various Temperatures, pHs, and Oregano Essential Oil Concentrations
Homemade eggplant salad, a traditional Greek appetizer, was inoculated with Escherichia coli O157:H7 NCTC 12900 supplemented with different concentrations of oregano essential oil (0.0, 0.7, 1.4, and 2.1% [vol/wt]) and stored at different temperatures (0, 5, 10, and 15°C). The product's pH was adjusted to 4.0, 4.5, or 5.0 with lemon juice. For each combinat
American Society for Microbiology.