15 research outputs found
Percepção e medidas de gestão de riscos por produtores de arroz irrigado na Fronteira Oeste do Rio Grande do Sul
Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry
Nematodes of Amazonian vertebrates deposited in the Helminthological Collection of the Oswaldo Cruz Institute with new records
Intestinal parasites among Karitiana Indians from Rondônia State, Brazil Parasitas intestinais entre índios Karitiana do Estado de Rondônia, Brasil
Gravity sedimentation parasitological examinations were performed in stool samples from 111 Karitiana Indians from Rondônia State, Brazilian Amazon Basin. Intestinal parasites were found in 43 samples (38.7%). Ascaris lumbricoides was the most prevalent helminth species (18.9%). Egg counts in samples positive for Ascaris suggested an overdispersed distribution of worm burdens in the host population. Age-distribution pattern of intestinal parasites among Karitiana Indians was found to be rather unusual: the highest prevalence (60.0%) was detected in the 12-to 16-year-old age group<br>Exames parasitológicos por meio da técnica de sedimentação por gravidade foram feitos em amostras fecais de 111 índios Karitiana, do Estado de Rondônia, na Amazônia brasileira. Encontraram-se parasitas intestinais em 43 amostras (38,7%). Ascaris lumbricoides foi o parasita mais prevalente (18,9%). As contagens de ovos em amostras positivas para Ascaris sugeriram uma distribuição superdispersa das cargas parasitárias na população hospedeira. Encontrou-se uma distribuição etária incomum de parasitas intestinais entre os índios Karitiana: a maior prevalência (60%) foi detectada na faixa etária entre 12 e 16 ano
Parapiptadenia Brenam (Leguminosae-Mimosoideae) - Estudo taxonômico das espécies brasileiras
Npy and sbgnrh gene expression in juvenile and adult male brazilian flounder paralichthys orbignyanus
The objective of this study was to evaluate
neuropeptide Y (NPY) and sea bream gonadotropin-release
hormone (sbGnRH) gene expression in juvenile and adult males
of Brazilian flounder. Hypothalamuses from fish were sampled
for total RNA extraction. After cDNA synthesis, real-time PCR
was used to measure gene expression. NPY showed
approximately 2-fold increases in their mRNA levels while
sbGnRH showed 3-fold increases in adult fish. These results
suggest that these peptides could be involved on hypothalamic
regulation of Brazilian flounder sexual maturation.O objetivo deste estudo foi avaliar a expressão
gênica do neuropeptídeo Y (NPY) e da variante sea bream do
hormônio liberador de gonadotrofinas (sbGnRH) em linguados
machos juvenis e adultos. O hipotálamo foi isolado para a
extração de RNA total. Após a síntese de cDNA, a PCR em
tempo real foi usada para avaliar a expressão gênica. Foi
observado um aumento de aproximadamente duas vezes nos
níveis de NPY e de aproximadamente três vezes nos níveis de
sbGnRH nos peixes adultos. Esses resultados demonstram que
estes peptídeos podem estar envolvidos na regulação, via
hipotálamo, da maturação sexual no linguado
High prevalence of malnutrition in Internal Medicine wards – a multicentre ANUMEDI study
RECOVERY OF RICHNESS, BIOMASS AND DENSITY IN ATLANTIC RAINFOREST AREAS AFTER CLEARCUTTING
Mineralogical and geochemical influences on sediment color of Amazon wetlands analyzed by visible spectrophotometry
Based on sedimentological and geochemical data, this work relates spectrophotometric measurements with sediment composition and its application in palaeoecological studies of Amazon wetlands. The CIELAB values are directly related to mineralogical and chemical composition, mostly involving quartz, iron oxyhydroxides and sulfides (e.g. pyrite), and total organic carbon. Total organic carbon contents between 0.4-1%, 1-2%, 3-5% and 15-40% were related to L* (lightness) data of 27, 26-15, 7-10 and 7 or less, respectively. The CIELAB values of a deposit in Marabá, Pará, were proportional to variations in quartz and total organic carbon contents, but changes in zones of similar color, mainly in the +a* (red) and +b* (yellow) values of deposits in Calçoene, Amapá and Soure, Pará, indicate a close relationship between total organic carbon content and iron oxyhydroxides and sulfides. Furthermore, the Q7/4 diagram (ratio between the % re?ectance value at 700 nm to that at 400 nm, coupled with L*) indicated iron-rich sediments in the bioturbated mud facies of the Amapá deposit, bioturbated mud and bioturbated sand facies of Soure deposit, and cross-laminated sand and massive sand facies of the Marabá core. Also, organic-rich sediments were found in the bioturbated mud facies of the Amapá deposit, lenticular heterolithic and bioturbated mud facies of the Soure deposit, and laminated mud and peat facies of the Marabá deposit. At the Marabá site, the data suggest an autochthonous influence with peat formation. The coastal wetland sites at Marajó and Amapá represent the development of a typical tidal flat setting with sulfide and iron oxyhydroxides formation during alternated flooding and drying