Particle Competition
Mostrando 25-36 de 43 artigos, teses e dissertações.
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25. Ligand-receptor binding measured by laser-scanning imaging
This report describes the integration of laser-scanning fluorometric cytometry and nonseparation ligand-binding techniques to provide new assay methods adaptable to miniaturization and high-throughput screening. Receptor-bound, cyanine dye-labeled ligands, [Cy]ligands, were discriminated from those free in solution by measuring the accumulated fluorescence a
The National Academy of Sciences.
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26. A general mechanism for regulation of access to the translocon: Competition for a membrane attachment site on ribosomes
For proteins to enter the secretory pathway, the membrane attachment site (M-site) on ribosomes must bind cotranslationally to the Sec61 complex present in the endoplasmic reticulum membrane. The signal recognition particle (SRP) and its receptor (SR) are required for targeting, and the nascent polypeptide associated complex (NAC) prevents inappropriate targ
The National Academy of Sciences.
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27. High affinity binding of chylomicron remnants to rat liver plasma membranes.
The binding of chylomicron remnants rat liver plasma membranes was studied. Liver membranes bound up to 8 times more remnants than they bound chylomicrons. The remnant particle appeared to bind to the membrane as a unit. Remnant binding was greatest to liver plasma membrane; only one third as much binding was observed with whole liver homogenate, and virtual
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28. Ribosomal binding region for the antibiotic tiamulin: stoichiometry, subunit location, and affinity for various analogs.
Equilibrium dialysis experiments with a highly purified preparation of labeled tiamulin, a semisynthetic derivative of the antibiotic pleuromutilin, and Escherichia coli ribosomes allowed the determination of two binding sites for the drug. The binding reaction showed a cooperative effect. Of the two subunits, the 50S particle was able to bind the antibiotic
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29. Induction of macrophage antitumor activity by acetylated low density lipoprotein containing lipophilic muramyl tripeptide.
A method has been developed for the selective delivery of lipophilic immunomodulators to macrophages, which results in the induction of antitumor activity. This method utilizes exhaustively acetylated low density lipoprotein (acetyl-LDL) to deliver the lipophilic immunomodulator, muramyl tripeptide phosphatidylethanolamine (MTP-PtdEtn; amide composed of N-ac
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30. Covalent Attachment of Diethylstilbestrol to Glutamate Dehydrogenase: Implications for Allosteric Regulation
An affinity labeling reagent for the estrogenic-binding site of bovine liver L-glutamate dehydrogenase (EC 1.4.1.3) was prepared by conversion of diethylstilbestrol to its alkylating analogue, bromoacetyldiethylstilbestrol. Under standard assay conditions, the analogue acted as a reversible allosteric ligand with regulatory activity much like that of diethyl
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31. GTP-binding proteins in rat liver nuclear envelopes.
Nuclear transport as well as reassembly of the nuclear envelope (NE) after completion of mitosis are processes that have been shown to require GTP and ATP. To study the presence and localization of GTP-binding proteins in the NE, we have combined complementary techniques of [alpha-32P]GTP binding to Western-blotted proteins and UV crosslinking of [alpha-32P]
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32. Unilateral Synthesis of Reovirus Double-Stranded Ribonucleic Acid by a Cell-Free Replicase System
A large-particle fraction obtained from reovirus-infected L cells contained both replicase and transcriptase activity. The in vitro replicase reaction slowed down soon after initiation, whereas the transcriptase reaction proceeded at an unabated rate. The replicase and transcriptase were both template-bound and could be separated from one another by controll
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33. Protein Targeting to the Bacterial Cytoplasmic Membrane
Proteins that perform their activity within the cytoplasmic membrane or outside this cell boundary must be targeted to the translocation site prior to their insertion and/or translocation. In bacteria, several targeting routes are known; the SecB- and the signal recognition particle-dependent pathways are the best characterized. Recently, evidence for the ex
American Society for Microbiology.
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34. Interaction of Escherichia coli ribosomal protein S1 with ribosomes.
The binding affinity of Escherichia coli ribosomal protein S1 for 30S ribosomal particles has been determined by a sucrose gradient band sedimentation technique; the association constant (K) for the binding of one S1 protein per active 30S ribosomal subunit is approximately 2 X 10(8) M-1. The involvement of the two polynucleotide binding sites of S1 protein
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35. Effects of human serum on bacterial competition with neutrophils for molecular oxygen.
A dialyzable factor(s) in human serum is known to stimulate gonococcal oxygen consumption. Its effect on other human pathogens was investigated. A 10% serum solution increased peak O2 consumption for Escherichia coli and Staphylococcus aureus to 157% (P less than 0.05) and 199% (P less than 0.02), respectively, of their O2 consumption when suspended in Hanks
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36. Role of Microniches in Protecting Introduced Rhizobium leguminosarum biovar trifolii against Competition and Predation in Soil
The importance of microniches for the survival of introduced Rhizobium leguminosarum biovar trifolii cells was studied in sterilized and recolonized sterilized loamy sand and silt loam. The recolonized soils contained several species of soil microorganisms but were free of protozoa. Part of these soil samples was inoculated with the flagellate Bodo saltans,