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Mostrando ítems 16581-16590 de 49503
Edaphic characterization of a forest savanna ecotone in southeastern Brazil
(Fundação Zoobotanica Rio Grande Sul, Museu Ciencias Naturais, 2009-12-31)
Edaphic characterization of a forest savanna ecotone in southeastern Brazil. This study was motivated by the scarcity of studies involving descriptions of edaphic horizons in the transition from savanna to forest. It aims ...
Vertical migration of Haemonchus contortus third stage larvae on Brachiaria decumbens grass
(Elsevier B.V., 2008-11-25)
The present study aimed at evaluating the vertical migration of Haemonchus contortus third stage larvae (1-3) on Brachiaria decumbens grass, as well as at verifying whether larval numbers on pasture varies over the day due ...
V2O5/TiO2 catalyst xerogels: Method of preparation and characterization
(Kluwer Academic Publ, 2002-08-01)
This work describes a modified sol-gel method for the preparation of V2O5/TiO2 catalysts. The samples have been characterized by N-2 adsorption at 77 K, X-ray Diffractometry (XRD), Scanning Electronic Microscopy (SEM/EDX) ...
Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and C-13-solid state NMR data
(Coastal Education & Research Foundation, 2005-03-01)
Elemental composition and spectroscopic properties (FT-IR and CP/MAS C-13-NMR) of sedimentary humic substances (HS) from aquatic subtropical environments (a lake, an estuary and two marine sites) are investigated. Humic ...
Effect of narcosis with CO2 on the ovarian development in queens of Apis mellifera (Hymenoptera, Apini)
(California State University, 2005-01-01)
Exposure of 1, 4, 7 & 10 day-old virgin queens of Apis mellifera Linne 1758 for 1 min to CO2 accelerated their ovarian development, having a similar effect as mating on the initial formation of the ovarian follicles. In 3 ...
Structure of chorismate synthase from Mycobacterium tuberculosis
(Elsevier B.V., 2006-05-01)
In bacteria, fungi, plants, and apicomplexan parasites, the aromatics compounds, such as aromatics amino acids, are synthesized through seven enzymes from the shikimate pathway, which are absent in mammals. The absence of ...
The distribution of agglutinins and lytic activity against Trypanosoma rangeli and erythrocytes in Rhodnius prolixus and Triatoma infestans tissue extracts and haemolymph
(Instituto Oswaldo Cruz, Ministério da Saúde, 1991-06-01)
Haemolymph, heads, salivary glands, crops, midguts, hindguts, and Malpighian tubules from Rhodnius prolixus and Triatoma infestans were extracted in phosphate or Tris buffer saline with calcium, and tested for agglutination ...
Survival of Atta sexdens workers on different food sources
(Elsevier B.V., 2003-04-01)
Leaf-cutting ants belonging to the tribe Attini are major herbivores and important agriculture pests in the neotropics, these ants being thought to feed on the sap which exudes from the plant material which they cut and ...
Distinct localization of T cell Agrin during antigen presentation - evidence for the expression of Agrin receptor(s) in antigen-presenting cells
(Wiley-Blackwell, 2012-07-01)
Agrin is over-expressed by activated and autoimmune T cells, and synergizes with the T cell receptor (TCR) to augment cell activation. In the present study, we show that Agrin accumulates to distinct areas of the plasma ...
Effect of aerobic training status on both maximal lactate steady state and critical power
(Canadian Science Publishing, Nrc Research Press, 2012-08-01)
This study aimed at assessing the sensitivity of both maximal lactate steady state (MLSS) and critical power (CP) in populations of different aerobic training status to ascertain whether CP is as sensitive as MLSS to a ...