María Alicia Barros

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A comparative study on the coagulant activity of snake venoms was carried out in 26 Bothrops species, using specific clotting systems for the thrombin-like and the factor X-activator activities. With only two exceptions (B. erythromelas and B. castelnaudi) all venoms showed thrombin-like activity, since they were able to clot fibrinogen directly. The(More)
Cytogenetic analysis was performed in six nominal taxa of the genus Ctenomys with a diploid number of 2n=47/48. The studied species were: C. australis (2n=48, FN=76); C. mendocinus (2n=47/48, FN=68/75/76); C. porteousi (2n=47/48, FN=71/72/73); C. azarae (2n=47, FN=71); C. sp. (‘chasiquensis’) (2n=47/48); and C. talarum (2n=48, FN=80). The first three(More)
A series of populations of spiny rats (Proechimys) of NW and N Central Venezuela were found to belong to a circle of species and subspecies which surrounds the Andes of M6rida-CordiUera de la Costa mountain axis. This 'Rassenkreis' consists of 6 successive karyomorphs which exhibit a stepped-dine distribution (2n = 42, 44, 46, 48, 50 and 62). Each of the(More)
The last seven nucleotides of the 3'-end of rotavirus mRNAs, 5'-UGUGACC-3', are highly conserved and form a cis-acting signal that can promote the synthesis of (-) strand RNA to produce the viral dsRNA genome in vitro. Previous studies have shown that the sequence, location, and strandedness (single- versus double-stranded) of the 3'-consensus sequence of(More)
A detailed description of the karyotype of Proechimys trinitatis, (2n = 62, FN = SO), based on specimens from Trinidad, is given. It differs from the karyotype of Proechimys guyannensis (2n = 40) which is interpreted as an indication of the need of giving full species status to P. trinitatis. It also differs from the karyotype of P. urichi, a montane form(More)
Heterochromatin is a dominant component of the genome in the bottae group of the pocket gopher genus Thomomys, having had a major role in the karyotypic evolution of member species. Heterochromatin characteristics of two subspecies of T. bottae and one of T. umbrinus were examined with fluorochrome dyes identifying presumptive GC- and AT-rich regions. In(More)
Heterochromatin is a dominant component of the genome in the bottae group of the pocket gopher genus Thomomys, having had a major role in the karyotypic evolution of member species. Heterochromatin characteristics of two subspecies of T. bottae and one of T. umbrinus were examined with fluorochrome dyes identifying presumptive GC- and AT-rich regions. In(More)
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