Mature Minor
Mostrando 25-36 de 132 artigos, teses e dissertações.
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25. Minor histocompatibility antigen H-Y is expressed on human hematopoietic progenitor cells.
Polymorphic minor transplantation antigens probably play an important role in immune mediated graft rejections of bone marrow transplants. Mapping of these antigens on hematopoietic progenitor cells (HPC) is important since these antigenic determinants may serve as target structures in the rejection process, and it ultimately opens the possibility to match f
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26. Carotenogenesis associated with arthrosporulation of Trichophyton mentagrophytes.
Carotenoid pigments were demonstrated in arthrospores of the dermatophyte Trichophyton mentagrophytes but were absent from hyphae and microconidia of this fungus. Incubation at higher temperatures (39 degrees C) allowed arthrosporulation to occur, but essentially no carotenoid was detected in such arthrospores. The carotenoid formation in arthrosporulating T
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27. Antigenicity of Recombinant Proteins Derived from Rhoptry-Associated Protein 1 of Plasmodium falciparum
Rhoptry-associated protein 1 (RAP1) of Plasmodium falciparum is a potential component of a malaria vaccine. We have expressed in Escherichia coli eight recombinant RAP1 proteins representing almost the entire sequence of the mature protein and assessed the antigenicity of the proteins by immunization of mice. Antisera to six of the recombinant proteins react
American Society for Microbiology.
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28. The movement protein of cucumber mosaic virus traffics into sieve elements in minor veins of nicotiana clevelandii
The location of the 3a movement protein (MP) of cucumber mosaic virus (CMV) was studied by quantitative immunogold labeling of the wild-type 3a MP in leaves of Nicotiana clevelandii infected by CMV as well as by using a 3a-green fluorescent protein (GFP) fusion expressed from a potato virus X (PVX) vector. Whether expressed from CMV or PVX, the 3a MP targete
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29. Xenopus laevis U1 snRNA genes: characterisation of transcriptionally active genes reveals major and minor repeated gene families.
Xenopus laevis U1 snRNA genes are found in several different genomic arrangements. The major family of genes is organised in tandem repeats of 1.8 kb. The minor U1-family is much less abundant and is present on 1.2-kb HinfI restriction fragments. In addition there are genomic arrangements present in one or very few copies, which could represent the ends of r
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30. Anatomical and photosynthetic acclimation to the light environment in species with differing mechanisms of phloem loading
Plants load sugars from photosynthesizing leaves into the phloem of exporting veins either “apoplastically” (by using H+/sucrose symporters) or “symplastically” (through plasmodesmata). The ability to regulate photosynthesis in response to the light environment was compared among apoplastic loaders (pea and spinach) and symplastic loaders (pumpkin an
National Academy of Sciences.
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31. Bacillopeptidase F of Bacillus subtilis: purification of the protein and cloning of the gene.
We have purified a minor extracellular serine protease from Bacillus subtilis. Characterization of this enzyme indicated that it was most likely the previously reported enzyme bacillopeptidase F. The amino-terminal sequence of the purified protein was determined, and a "guess-mer" oligonucleotide hybridization probe was constructed on the basis of that seque
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32. A potato mitochondrial isoleucine tRNA is coded for by a mitochondrial gene possessing a methionine anticodon.
The nucleotide sequence of a potato mitochondrial tRNA(Ile) has been determined. This tRNA has a lysidine-like minor nucleotide in the first position of the anticodon (position 34). The corresponding mitochondrial gene has been cloned and sequenced. This gene has a CAT anticodon which corresponds to methionine. The C residue in the anticodon must therefore b
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33. Unusual subcutaneous mixed tumour exhibiting adipose, fibroblastic, and epithelial components.
A subcutaneous mass in the left supraclavicular fossa of a 55-year-old woman proved on histological examination to be composed of islands of squamous cells embedded in bands of spindle cells and associated with mature adipose tissue. Electron microscopy showed that the spindle cells were fibroblastic in nature and not squamous cells showing spindle different
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34. Companion-Cell Specific Localization of Sucrose Synthase in Zones of Phloem Loading and Unloading.
An immunohistochemical approach was used in maize (Zea mays) and citrus (Citrus paradisi) to address the previously noted association between sucrose synthase and vascular bundles and to determine the localization of the low but detectable levels of sucrose synthase that remain in leaves after the import-export transition. Sucrose synthase protein was immuno
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35. Cloning and characterization of the gene for an additional extracellular serine protease of Bacillus subtilis.
We have purified a minor extracellular serine protease from a strain of Bacillus subtilis bearing null mutations in five extracellular protease genes: apr, npr, epr, bpr, and mpr (A. Sloma, C. Rudolph, G. Rufo, Jr., B. Sullivan, K. Theriault, D. Ally, and J. Pero, J. Bacteriol. 172:1024-1029, 1990). During purification, this novel protease (Vpr) was found bo
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36. Effects of base change mutations within an Escherichia coli ribosomal RNA leader region on rRNA maturation and ribosome formation
The effects of base change mutations in a highly conserved sequence (boxC) within the leader of bacterial ribosomal RNAs (rRNAs) was studied. The boxC sequence preceding the 16S rRNA structural gene constitutes part of the RNase III processing site, one of the first cleavage sites on the pathway to mature 16S rRNA. Moreover, rRNA leader sequences facili
Oxford University Press.