asynaptic behavior of x and y chromosomes in the virginia oppossum and the southern pygmy mouse.the meiotic behavior of silver-stained x and y chromosomes of the virginia opossum, didelphis virginiana, and the southern pygmy mouse, baiomys musculus, was studied by light microscopy. while the sex chromosomes of these two species differ in both size and morphology, their meiotic behavior is very similar. in both species a typical sex vesicle is formed during pachytene, but unlike most other mammalian species thus far studied, a synaptonemal complex does not form between the x and y chromosom ...19807389409
genetic characterization and phylogeny of a hantavirus from western mexico.hantaviruses can cause two serious illnesses when transmitted from their rodent reservoirs to humans; hantavirus pulmonary syndrome (hps) in the new world and hemorrhagic fever with renal syndrome in the old world. cases of hps were first recognized in the americas in small, focal outbreaks in rural populations in the southwestern usa in 1993. since that time, outbreaks as well as sporadic cases of hps have been recognized throughout the americas. remarkably, hps cases have not been reported in ...200817963942
experimental infection of potential reservoir hosts with venezuelan equine encephalitis virus, 1993, an outbreak of encephalitis among 125 affected equids in coastal chiapas, mexico, resulted in a 50% case-fatality rate. the outbreak was attributed to venezuelan equine encephalitis virus (veev) subtype ie, not previously associated with equine disease and death. to better understand the ecology of this veev strain in chiapas, we experimentally infected 5 species of wild rodents and evaluated their competence as reservoir and amplifying hosts. rodents from 1 species (baiomys musculus) s ...200919331726
ecological connectivity of trypanosoma cruzi reservoirs and triatoma pallidipennis hosts in an anthropogenic landscape with endemic chagas disease.traditional methods for chagas disease prevention are targeted at domestic vector reduction, as well as control of transfusion and maternal-fetal transmission. population connectivity of trypanosoma cruzi-infected vectors and hosts, among sylvatic, ecotone and domestic habitats could jeopardize targeted efforts to reduce human exposure. this connectivity was evaluated in a mexican community with reports of high vector infestation, human infection, and chagas disease, surrounded by agricultural a ...201223049923
is genetic structure of the southern pygmy mouse baiomys musculus (cricetidae) related to human-induced spatial landscape heterogeneity in a tropical dry forest?tropical dry forests are biologically important biomes sustaining a high rate of endemic species. however, these forests are highly threatened by human activities that negatively impact them on distinct levels, including the genetic diversity. within the framework of landscape genetics (that seeks to evaluate the relation of characteristics of the environmental matrix with population genetics), we used issr markers to evaluate the relationship between the alteration of tropical dry forest by hum ...201222987292
comparison of two wild rodent species as sentinels of environmental contamination by mine tailings.contamination with heavy metals is among the most hazardous environmental concerns caused by mining activity. a valuable tool for monitoring these effects is the use of sentinel organisms. particularly, small mammals living inside mine tailings are an excellent study system because their analysis represents a realistic approach of mixtures and concentrations of metal exposure.201222161299
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