| use of an argentinean wildlife tissue collection for epidemiological studies of histoplasmosis. | histoplasmosis is a worldwide systemic endemic mycosis caused by several cryptic species included within the histoplasma capsulatum complex. domestic and wild mammals are susceptible to infection by this fungus and could be used as indicators of its presence in the environment. the aim of the study was to identify the natural reservoirs of h. capsulatum in the argentinean humid pampas eco-region analyzing a wildlife frozen-tissue collection and trace its distribution patterns over time and space ... | 2020 | 31993951 |
| habitat associations of small mammals in southern brazil and use of regurgitated pellets of birds of prey for inventorying a local fauna. | we inventoried terrestrial small mammals in an agricultural area in southern brazil by using trapping and prey consumed by barn owls (tyto alba) and white-tailed kites (elanus leucurus). small mammals were trapped in three habitat types: corn fields, uncultivated fields ("capoeiras"), and native forest fragments. a total of 1,975 small mammal specimens were trapped, another 2,062 identified from the diet of barn owls, and 2,066 from the diet of white-tailed kites. both trapping and prey in the p ... | 2007 | 18278312 |
| amblyomma triste koch, 1844 (acari: ixodidae): hosts and seasonality of the vector of rickettsia parkeri in uruguay. | amblyomma triste koch, 1844, the tick species most frequently involved in human bites in uruguay, has been implicated as a vector of human rickettsiosis. seasonal abundance of adult a. triste was examined by standard flagging at three sites where human tick bites and cases of the disease have been reported. adult tick activity occurred from august to february (end of winter to mid summer in the southern hemisphere) with a peak in spring. activity declined in step with decreasing temperatures and ... | 2008 | 18565680 |
| the synaptic behaviour of the x and y chromosomes in the marsupial monodelphis dimidiata. | the pairing behaviour of the x and y chromosomes of monodelphis dimidiata was studied with light and electron microscopy. pairing of the sex chromosomes is delayed with respect to autosome synapsis. both the x and the minute y chromosome show an axis attached by its two ends to the nuclear envelope. synapsis of the sex chromosomes occurs by the joining of the chromatin sheaths that surround the axes and by a small, three-layered structure close to the nuclear envelope. the x and y chromosomes re ... | 1975 | 1175455 |
| protein immunolocalization supports the presence of identical mechanisms of xy body formation in eutherians and marsupials. | the meiotic sex chromosomes of the american marsupials monodelphis dimidiata and didelphis albiventris were studied with electron microscopy (em) and with immunofluorescence localization of meiotic proteins sycp1 and sycp3, and proteins essential for meiotic sex chromosome inactivation (msci), gamma-h2ax and brca1. the chromatin of the non-synaptic x and y chromosomes contains gamma-h2ax, first as foci and then as homogeneous staining at late stages. the thick and split x and y axes are labelled ... | 2007 | 17846907 |