29 research outputs found
Benznidazole
The conformation of the title compound [systematic name: N-benzyl-2-(2-nitroÂimidazol-1-yl)acetamide], C12H12N4O3, can be described in terms of the relative orientation of three planar fragments, the imidazol group (A), benzyl group (B), and the acetamide fragment (C), with corresponding dihedral angles: A/C = 88.17â
(4), B/C = 67.12â
(5) and A/B = 21.11â
(4)°. The crystal packing is enhanced by a network of strong interÂmolecular NâHâŻO hydrogen bonds
PteridĂłfitas da Serra Negra, Minas Gerais, Brasil
Este trabalho apresenta uma lista de espĂ©cies de pteridĂłfitas que ocorrem na Serra Negra, Minas Gerais. A serra estĂĄ inserida no complexo da Serra da Mantiqueira situada entre Rio Preto, Lima Duarte, Santa BĂĄrbara do Monte Verde e Olaria, tendo seus limites nos pontos 21Âș58'11"S 43Âș53'21" W, 22Âș01'46,4" S 43Âș52'31,5" W, 21Âș58'21,4" S 43Âș50'06,5" W e 21Âș58'53" S 43Âș56'08" W. A vegetação da serra Ă© formada por um mosaico de fitofisionomias, sendo encontradas formaçÔes florestais (florestas ombrĂłfilas e semidecĂduas) e campestres (campos rupestres). O inventĂĄrio florĂstico foi realizado entre os anos de 2003 e 2008, em excursĂ”es mensais para coleta de amostras e registro de dados. Na serra foram registradas 209 tĂĄxons infragenĂ©ricos distribuĂdas em 24 famĂlias e 75 gĂȘneros. As famĂlias com maior nĂșmero de espĂ©cies foram Polypodiaceae (40), Dryopteridaceae (33) e Pteridaceae (25). A maioria das espĂ©cies (109) foi encontrada ocorrendo exclusivamente no interior de floresta. Em relação ao hĂĄbito, 69 espĂ©cies foram encontradas exclusivamente como terrestres, 37 como rupĂcolas ou terrestres e 32 exclusivamente epĂfitas. Este trabalho revela uma elevada riqueza de pteridĂłfitas na regiĂŁo e indica a importĂąncia de estudos desta natureza na conservação e manejo das pteridĂłfitas em Minas Gerais.This work presents an inventory of pteridophyte species that occur in the Serra Negra, of Minas Gerais. The area is part of the Mantiqueira Range, and is situated between the coordinates 21Âș58'11"S 43Âș53'21" W, 22Âș01'4.4" S, 43Âș52'31.5" W, 21Âș58'21.4" S, 43Âș50'06.5" W and 21Âș58'53" S, 43Âș56'08" W. The vegetation in the Serra Negra is characterized by a mosaic of different phytophysiognomies, divided into forests (evergreen and seasonal semideciduous forests) and open formations (rocky grasslands). The inventory was carried out from 2003 to 2008, during monthly excursions to collect botanical material and data in the study area. A total of 209 species, distributed in 24 families and 75 genera, were recorded. The families with the highest number of species were Polypodiaceae (40), Dryopteridaceae (33) and Pteridaceae (25). More than the half (110) of the inventoried species were recorded exclusively in the forests formations. Sixty-nine species were terrestrial, 37 were saxicolous or terrestrial and 32 were epiphytes. This work shows that this region is rich in ferns and reveals the importance of this kind of study for conservation and management of pteridophytes in the state of Minas Gerais
Development of a Bacillus sphaericus tablet formulation and its evaluation as a larvicide in the biological control of Culex quinquefasciatus
This study aimed to analyze the final fermentation culture of Bacillus
sphaericus 2362, standardize it and develop an active tablet
formulation for use in urban mosquito breeding sites. It was performed
in three phases: analysis and standardization of a B. sphaericus
fermented culture; physical, chemical, and biological analysis of the
active powder (solubility, residual humidity, particle size, resting
angle, flowing off time, compacted density, and biological activity
against Culex quinquefasciatus larvae); and the development of
fast-disintegrating tablets. Five formulations with differing
compositions were developed and a UV protector was added to the
selected formulation. The formulation products with or without UV
protector, as well as the active powder caused 100% larval mortality
from 1 day to 2 months after a single treatment under simulated field
conditions. These results show that the UV protector does not affect
the initial larvicide activity of B. sphaericus, nor its persistence
over a period of two months