Logarithmic Functions
Mostrando 25-33 de 33 artigos, teses e dissertações.
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25. Application of thermal effusivity as a process analytical technology tool for monitoring and control of the roller compaction process
The aim of this study was to examine the relationship between physical characteristics of compacted ribbons and their thermal effusivity in an attempt to evaluate the feasibility of using effusivity for in-process monitoring of roller compaction. In this study, thermal effusivity, solid fraction, tensile strength, and Young's modulus of ribbons of microcryst
Springer-Verlag.
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26. A and alpha supernatant pretreatment of Saccharomyces cerevisiae cells affects both the kinetics and efficiency of mating.
The effects of culture supernatant treatment on subsequent matings between pretreated a and alpha Saccharomyces cerevisiae cells were studied. For each experiment, pairs of a and alpha [rho+] or [rho- rho0] cells in the logarithmic growth phase in defined minimal medium were pretreated for a total of 15 min (by exchanging their cell-free supernatants or by m
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27. NPK1, a tobacco gene that encodes a protein with a domain homologous to yeast BCK1, STE11, and Byr2 protein kinases.
We have isolated a cDNA (cNPK1) that encodes a predicted protein kinase of 690 amino acids from suspension cultures of tobacco cells. The deduced sequence is closely related to those of the protein kinases encoded by the STE11 and BCK1 genes of Saccharomyces cerevisiae and the byr2 gene of Schizosaccharomyces pombe. STE11 and Byr2 function in the yeast matin
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28. Transcription factor sigma B of Bacillus subtilis controls a large stationary-phase regulon.
Transcription factor sigma B of Bacillus subtilis is active during the stationary growth phase, but its physiological role remains unknown. Understanding the function and regulation of genes controlled by sigma B (csb genes) should provide important clues to sigma B function in stationary-phase cells. To this end, we used a genetic approach to identify six n
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29. Expression of Virulence of Mycobacterium tuberculosis within Human Monocytes: Virulence Correlates with Intracellular Growth and Induction of Tumor Necrosis Factor Alpha but Not with Evasion of Lymphocyte-Dependent Monocyte Effector Functions
We assessed the applicability of an in vitro model of low-level infection of human monocytes to the characterization of the virulence of strains of the Mycobacterium tuberculosis family. Peripheral blood monocytes were infected at a 1:1 ratio with the virulent M. tuberculosis strain H37Rv, the avirulent M. tuberculosis strain H37Ra, and the attenuated M. bov
American Society for Microbiology.
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30. Molecular Organization of Intrinsic Restriction and Modification Genes BsuM of Bacillus subtilis Marburg
Transcriptional analysis and disruption of five open reading frames (ORFs), ydiO, ydiP, ydiR, ydiS, and ydjA, in the prophage 3 region of the chromosome of Bacillus subtilis Marburg revealed that they are component genes of the intrinsic BsuM restriction and modification system of this organism. The classical mutant strain RM125, which lacks the restriction
American Society for Microbiology.
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31. Time domain spectroscopy of the membrane capacitance in frog skeletal muscle.
Dielectric spectra representing the frequency dependence of the complex permitivity at a range of depolarizations were obtained from voltage-clamped frog skeletal muscle membranes. This employed an analysis that derived the Fourier coefficients defining the capacitative transients to 10 mV steps as continuous functions of frequency, and so could examine clos
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32. Ferritin Mutants of Escherichia coli Are Iron Deficient and Growth Impaired, and fur Mutants are Iron Deficient
Escherichia coli contains at least two iron storage proteins, a ferritin (FtnA) and a bacterioferritin (Bfr). To investigate their specific functions, the corresponding genes (ftnA and bfr) were inactivated by replacing the chromosomal ftnA and bfr genes with disrupted derivatives containing antibiotic resistance cassettes in place of internal segments of th
American Society for Microbiology.
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33. Identification and Characterization of the scl Gene Encoding a Group A Streptococcus Extracellular Protein Virulence Factor with Similarity to Human Collagen
Group A Streptococcus (GAS) expresses cell surface proteins that mediate important biological functions such as resistance to phagocytosis, adherence to plasma and extracellular matrix proteins, and degradation of host proteins. An open reading frame encoding a protein of 348 amino acid residues was identified by analysis of the genome sequence available for
American Society for Microbiology.