| evaluation of antigens from various leishmania species in a western blot for diagnosis of american tegumentary leishmaniasis. | a western blot method that uses antigens from culture promastigote forms of leishmania (viannia) braziliensis, l. (leishmania) amazonensis, l. (leishmania) tropica, and a trypanosomatid (strain 268t) isolated from naturally infected tomatoes was evaluated for laboratory diagnosis of american tegumentary leishmaniasis (atl). serum samples were obtained from 108 patients with atl (group i), 23 chagasic patients (group ii), 32 patients with other diseases (group iii), and 78 healthy individuals (gr ... | 2002 | 12135276 |
| biogeochemistry of mercury in the amazonian environment. | in this paper, the processes that affect mercury (hg) cycling in the amazonian environment were reviewed, criticized and new directions of research are proposed. the discussion of the origin of the mercury contamination, whether natural or anthropogenic is marked by a lack of fundamented arguments from both sides. undoubtedly mercury inputs from gold mining have locally increased environmental concentrations, but in the whole amazon, these loads would be insignificant, considering the high conce ... | 2003 | 14571962 |
| molecular phylogeny, biogeography and insights into the origin of parthenogenesis in the neotropical genus leposoma (squamata: gymnophthalmidae): ancient links between the atlantic forest and amazonia. | leposoma is a conspicuous component of leaf litter herpetofauna of south and central american rainforests. the 15 bisexual and one parthenogenetic species are allocated to the parietale and scincoides groups based on morphology. phylogenetic analyses of 1830 bp (mtdna+nuclear) were performed on 63 specimens of four species from amazonian and panamanian rainforests, and six species and one undescribed form from the atlantic forest. different methods of tree reconstruction were explored, with anot ... | 2011 | 21801842 |