African Derived
Mostrando 25-36 de 158 artigos, teses e dissertações.
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25. Parental Analysis of Introgressive Hybridization between African and European Honeybees Using Nuclear DNA Rflps
African honeybees, introduced into Brazil 33 years ago, have spread through most of South and Central America and have largely replaced the extant European bees. Due to a paucity of genetic markers, genetic interactions between European and African bees are not well understood. Three restriction fragment length polymorphisms (RFLPs), detected with random, nu
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26. Human topoisomerase I promotes HIV-1 proviral DNA synthesis: Implications for the species specificity and cellular tropism of HIV-1 infection
Although HIV type 1 (HIV-1) cannot efficiently replicate in simian cells, the mechanism(s) involved in the restriction of virus tropism remain unclear. To investigate this, we have focused on the identification of human cellular factors that can influence the infectivity of HIV-1 derived from African green monkey producer cells. Whereas the infectivity o
National Academy of Sciences.
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27. Induction of AIDS by simian immunodeficiency virus from an African green monkey: species-specific variation in pathogenicity correlates with the extent of in vivo replication.
Previous studies suggested that simian immunodeficiency viruses isolated from African green monkeys (SIVagm) are relatively nonpathogenic. The report describes the isolation and biologic and molecular characterization of a pathogenic SIVagm strain derived from a naturally infected African green monkey. This virus induced an AIDS-like syndrome characterized b
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28. Putative Ancestral Origins of Chromosomal Segments in Individual African Americans: Implications for Admixture Mapping
Theoretically, markers that distinguish European from West African ancestry can be used to examine the origin of chromosomal segments in individual African Americans. In this study, putative ancestral origin was examined by using haplotypes estimated from genotyping 268 African Americans for 29 ancestry informative markers spaced over a 60-cM segment of chro
Cold Spring Harbor Laboratory Press.
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29. Mosaic genome structure of simian immunodeficiency virus from west African green monkeys.
Elucidation of the phylogenetic origins of simian and human immunodeficiency viruses (SIV and HIV) is fundamental to the understanding of HIV pathogenesis and the spread of AIDS worldwide. In this study, we molecularly characterized multiple SIVAGM isolates from four different African green monkey species (vervet, grivet, sabaeus and tantalus monkeys). Phylo
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30. Establishment of a Vero cell line persistently infected with African swine fever virus.
A Vero cell line persistently infected with African swine fever virus was established by infecting the cells in the presence of 10 mM NH4Cl (Vero-P cell line). The virus derived from the Vero-P cultures infected Vero cells, and virus titers were comparable to those obtained in Vero cells acutely infected with African swine fever virus. The structural protein
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31. Genetic characterization of new West African simian immunodeficiency virus SIVsm: geographic clustering of household-derived SIV strains with human immunodeficiency virus type 2 subtypes and genetically diverse viruses from a single feral sooty mangabey troop.
It has been proposed that human immunodeficiency virus type 2 (HIV-2) originated from simian immunodeficiency viruses (SIVs) that are natural infections of sooty mangabeys (Cercocebus torquatus atys). To test this hypothesis, SIVs from eight sooty mangabeys, including six new viruses from West Africa, were genetically characterized. gag and env sequences sho
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32. Expression and characterization of the thymidine kinase gene of African swine fever virus.
The thymidine kinase (TK) gene of African swine fever virus (ASFV) was located within the viral genome by using two degenerate oligonucleotide probes derived from sequences of the vaccinia virus and cellular TK genes. The TK gene was mapped within a 0.72-kbp BglII-XhoI fragment (0.242 to 0.246 map units) derived from a 23.9-kbp SalI-B fragment of the ASFV ge
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33. Continuous Lymphoid Cell Lines with Characteristics of B Cells (Bone-Marrow-Derived), Lacking the Epstein-Barr Virus Genome and Derived from Three Human Lymphomas
Three exceptional cell lines have been tested for the presence of the Epstein-Barr virus genome by nucleic acid hybridization (complementary RNA·DNA) and Epstein-Barr virus-determined nuclear antigen tests. Two lines were derived from Swedish lymphoma cases and one from an African Burkitt-like lymphoma biopsy that was negative for Epstein-Barr virus DNA and
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34. African Swine Fever Virus Is Enveloped by a Two-Membraned Collapsed Cisterna Derived from the Endoplasmic Reticulum
During the cytoplasmic maturation of African swine fever virus (ASFV) within the viral factories, the DNA-containing core becomes wrapped by two shells, an inner lipid envelope and an outer icosahedral capsid. We have previously shown that the inner envelope is derived from precursor membrane-like structures on which the capsid layer is progressively assembl
American Society for Microbiology.
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35. Interconversion of Type C and D Strains of Clostridium botulinum by Specific Bacteriophages
These studies show that Clostridium botulinum types C and D cultures can be cured of their prophages and converted to either type C or D depending on the specific phage used. Strains of types C and D were cured of their prophages and simultaneously ceased to produce their dominant toxins designated as C1 and D, respectively. Cured nontoxigenic cultures deriv
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36. Comparative study of matrix metalloproteinase expression between African American and Caucasian Women
To date there are 26 human matrix metalloproteinases (MMPs) which are classified according to their substrate specificity and structural similarities. The four major subgroups of MMPs are gelatinases, interstitial collagenases, stromelysins, and membrane-type matrix metalloproteinases (MT-MMPs). This study investigates the expression of 26 MMPs, which have b
BioMed Central.