Ministry of Agriculture

About: Ministry of Agriculture is a government organization based out in Rio de Janeiro, Brazil. It is known for research contribution in the topics: Chemistry & Salmonella. The organization has 1153 authors who have published 1189 publications receiving 14442 citations.

Low-level nitrogen and short-term addition increase soil carbon sequestration in Chinese forest ecosystems

Abstract: Soil carbon (C) sequestration plays a vital role in mitigating global climate change. Human activities have vastly increased nitrogen (N) deposition rate in China, which in turn influences belowground C cycle processes. We performed a meta-analysis based on 61 published studies on N addition experiments, including 4072 observations across China, to quantify the responses of belowground soil C dynamics and sequestration to N enrichment in Chinese forest ecosystems. The results showed that, on average, N enrichment significantly enhanced C dynamics in boreal and temperate forests by an average of 24% and 10% while it reduced in subtropical and tropical forests by 11% and 19%. The response of C pools and C input to N addition were more pronounced in boreal forests with +17% and +10% while it was lower in subtropical forests with −0.4% and −19% respectively. The N enrichment enhanced soil C output by in boreal (6%) and temperate (7%) forests and a negative effect in subtropical (−30%) and tropical forests (−10%). This can be explained by the higher reduction levels in C respiration, despite the slightly lower litter and root-derived C inputs. Notably, N addition specifically increased belowground C sequestration, at low N addition rates (<30 kg N ha−1 yr−1) and during a short-term period (<1 year). These C sequestration effects were reversed at higher N deposition levels and /or during a longer time period. This implies that soil C sequestration is currently most likely not enhanced in (large) parts of China, as forests are characterized by long-term elevated N deposition levels.

APLICAÇÃO DA REAÇÃO EM CADEIA DA POLIMERASE PARA DETECÇÃO DE Mycoplasma spp NA ROTINA DE CULTIVOS CELULARES

Abstract: The occurrence of Mycoplasma spp as contaminant of cell cultures in cell culture laboratories of the Escola de Veterinaria da UFMG and of the Laboratorio Nacional Agropecuario de Minas Gerais was obtained by the use of a fast DNA extraction protocol e by the use of PCR. The PCR sensitivity and specificity were evaluated. The search for Mycoplasmas DNA was done in 83 cell lines samples. We found infected cell lines in both laboratories. The quality of extracted DNA was verified using a beta-actin gene PCR. The Mycoplasmas’s PCR showed to be fast, sensitive and specific. KEY WORDS: Beta-actin, cell, culture, Mycoplasma spp, PCR.

Experiences with Rabies Control in Brazil

Abstract: The Brazilian Rabies Control Program is divided in two parts: the herbivore rabies control program which is coordinated by the Ministry of Agriculture and the canine rabies control program by the Ministry of Health. Both work together and with the cooperation of the States.

Injeção epidural preventiva de xilazina ou amitraz, em eqüinos: efeito antinociceptivo

Abstract: Epidural administration of α 2 agonists promotes antinociceptive effect and amitraz acts on α

Atributos físicos, químicos e microbiológicos dos solos sob diferentes usos em topossequências no Noroeste Fluminense - DOI:10.5039/agraria.v13i3a5543

Abstract: The objective of this study was to evaluate the interrelationships between land use, landscape position (position in a toposequence) and its effects on physical, chemical and microbiological attributes in soils under different land use systems in two toposequences in Northwest of Rio de Janeiro State. The toposequence 1 consisted of spontaneous vegetation in the summit and pupunha palm plantation in the backslope and footslope; Toposequence 2 consisted of pasture in the three positions. The following variables were determined: bulk density, total porosity and clay content; P, Ca, Mg, K, Al content and pH; microbial biomass carbon and nitrogen, microbial respiration, organic C and total N. Tocher method and principal component analysis (PCA) were performed for different groups of variables. Initially the physical attributes and some chemical attributes and then the microbiological attributes, organic C and total N were used. The groups formed by the Tocher method for the two sets of variables used were confirmed by the PCA. The set of physical and chemical attributes were more sensitive than COS, Nt and microbiological attributes to explain the similarity and, or, dissimilarity due to both toposequence positions and vegetal cover conversion. The microbiological attributes, COS and Nt showed the influence of vegetal cover conversion and management practices (and, or absence) in the dissimilarity between land use systems. The relevance of physical, chemical and, or, microbiological attributes to distinguish land use systems will depend on the variation sources of the environments in which these systems are being studied.