Tuberculosis in cattle slaughtered in the intermediate geographic region of Caicó, State of Rioi Grande do Norte, Brazil.

The bovine farming constitutes an economic and social activity of great importance for the State of Rio Grande do Norte, contributing for the creation of jobs and generation of income. However, factors related to the low technification of the activity on the part of the producers, the occurrence of a wide and intense drought in the last years and the presence of infectious diseases have caused significant damages to the breeders of animals in the State. Infectious diseases include tuberculosis, which is a zoonotic infection caused by Mycobacterium bovis, the primary host of which is cattle, but several domestic and wild mammal species, including humans, are also susceptible. The objective of the study was to determine the occurrence of tuberculosis in bovine slaughtered in two public slaughterhouses of the intermediate geographic region of Caicó, State of Rio Grande do Norte. Between November 2017 and August 2018, a total of 11,616 bovine carcasses underwent routine post-mortem inspection, with lesions suggestive of tuberculosis in one animal (0.009%). Samples of tissues located in the lung, heart and spleen were submitted to bacteriological culture and molecular diagnosis

Produção e qualidade da serrapilheira de três leguminosas arbóreas nativas do Nordeste do Brasil.

O objetivo deste trabalho foi estudar a produção e qualidade da serrapilheira de três leguminosas arbóreas nativas do Nordeste do Brasil, a faveira (Parkia platycephala Benth.), o pau-ferro (Caesalpinea ferrea Mart. ex Tul.) e o bordão-de-velho (Samanea saman (Jack.) Merr.) visando a inserção destas em sistemas silvipastoris..

Detection of Mycobacterium spp. in Coalho cheese commercialized in the city of Caicó-RN, Brazil.

Artisanal Coalho cheese is a popular dairy product, widely consumed in the Northeast region of Brazil, and is produced with raw or pasteurized milk. Microbial contamination of cheeses has very important consequences, both for the dairy industry, given the potential economic losses, and for public health, due to the risk of outbreaks of foodborne diseases. The present study aimed to detect Mycobaterium spp. in Coalho cheese commercialized in the city of Caicó-RN Brazil, using bacterial culture and molecular diagnosis. 50 samples of Coalho cheese obtained from local street market were analyzed, 35 of which were made from raw milk (artesanal cheese) and 15 with pasteurized milk (industrialized cheese)

Distinctive effects of allochthonous and autochthonous organic matter on CDOM spectra in a tropical lake

Despite the increasing understanding about differences in carbon cycling between temperate and tropical freshwater systems, our knowledge on the importance of organic matter (OM) pools on light absorption properties in tropical lakes is very scarce. We performed a factorial mesocosm experiment in a tropical lake (Minas Gerais, Brazil) to evaluate the effects of increased concentrations of al-lochthonous and autochthonous OM, and differences in light availability on the light absorption characteristics of chromophoric dissolved organic matter (CDOM). Autochthonous OM deriving from phytoplankton (similar to Chl a) was stimulated by addition of nutrients, while OM from degradation of terrestrial leaves increased allochthonous OM, and neutral shading was used to manipulate light availability. Effects of the additions and shading on DOC, Chl a, nutrients, total suspended solid concentrations (TSM) and spectral CDOM absorption were monitored every 3 days. CDOM quality was characterized by spectral indices (S250-450, S275-295, S350-450, S-R and SUVA(254)). Effects of carbon sources and shading on the spectral CDOM absorption was investigated through principal component (PCA) and redundancy (RDA) analyses. The two different OM sources affected CDOM quality very differently and shading had minor effects on OM levels, but significant effects on OM quality, especially in combination with nutrient additions. Spectral indices (S250-450 and S-R) were mostly affected by allochthonous OM addition. The PCA showed that enrichment by allochthonous carbon had a strong effect on the CDOM spectra in the range between 300 and 400 nm, while the increase in autochthonous carbon increased absorption at wavelengths below 350 nm. Our study shows that small inputs of allochthonous OM can have large effects on the spectral light absorption compared to large production of autochthonous OM, with important implications for carbon cycling in tropical lakes.Peer reviewe

Análise multidimensional de consórcios cenoura-alface sob diferentes combinações de densidades populacionais.

Este trabalho teve como objetivo avaliar o desempenho biológico de sistemas consorciados de cenoura e alface, sob diferentes combinações de densidades populacionais, com uso das análises bivariada de variância e envoltória de dados (DEA). O delineamento experimental usado foi o de blocos ao acaso completos, com cinco repetições, com os tratamentos arranjados em esquema fatorial 4x4. Os tratamentos resultaram da combinação de quatro populações de plantas de cenoura (40, 60, 80 e 100% da população recomendada no cultivo solteiro - PRCS) com quatro populações de plantas de alface (40, 60, 80 e 100% da PRCS). As populações recomendadas para os cultivos solteiros da cenoura e alface foram 500 mil e 250 mil plantas por hectare, respectivamente. Tanto o método bivariado como o método de análise de envoltória de dados são bastante eficazes na discriminação dos melhores sistemas de cultivo consorciados, por meio dos rendimentos das culturas. Os resultados da eficiência produtiva, medidos por modelos DEA, permitem uma análise estatística simples do ensaio consorciado. A robustez do método de análise bivariada de variância assegura a validade dos resultados.Título em inglês: Multidimensional analysis of carrot-lettuce intercroppings under different combinations of population densities

Crescimento de mudas de açaizeiro (Euterpe oleracea Mart.) submetidas a diferentes doses de fósforo.

Nos últimos anos tem se evidenciado uma crescente demanda por derivados do açaí, o que despertou o interesse de produtores no cultivo do açaizeiro em escala comercial e fez crescer a necessidade por mudas de qualidade. Assim, este trabalho objetivou avaliar o crescimento de mudas de açaizeiro submetidas a doses de fósforo. O experimento foi instalado no viveiro da Embrapa Acre, em delineamento experimental inteiramente casualizado, com 5 tratamentos (0, 150, 300, 450 e 600 g.m-³ de P2O5) e 3 repetições de 3 plantas. Utilizou-se o superfosfato simples como fonte de P. As avaliações foram realizadas aos 280 dias após a repicagem, para as seguintes variáveis: altura; diâmetro do colo; número de folha; comprimento da raiz; massa seca das folhas, estipe, raiz e total; Índice de Qualidade de Dickson (IQD). Os dados foram submetidos à análise de variância e analise de regressão. A altura, diâmetro do colo, comprimento da raiz e a massa seca das folhas, estipe, raiz e total foram ajustados por equações lineares, sofrendo efeito ascendente conforme as doses foram aumentadas. O número de folhas e o IQD foram ajustados por equações cubicas, com máxima eficiência nas doses 542,52 g.m-³ com 5,2 folhas e 535.68 g.m-³ com índice de 3,90. Conclui-se que o fósforo é realmente um elemento fundamental para o desenvolvimento inicial de plantas de açaizeiro, promovendo maior incremento da parte aérea e biomassa quando em alta disponibilidade. A growing demand for assai derivatives has become evident in recent years, which has aroused the interest of producers in the cultivation of assai palm on a commercial scale and has increased the need for quality seedlings. Thus, this work aimed to evaluate the growth of assai palm seedlings subjected to increasing doses of phosphorus. The experiment was installed in the plant nursery of Embrapa Acre, in completely randomized experimental design with 5 treatments (0, 150, 300, 450 and 600 g.m-³ of P2O5) and 3 repetitions of 3 plants. Single Superphosphate was used as source of P. The evaluations were performed at 280 days after the seedlings pricking out, for the following variables: plant height; neck diameter; number of leaf; root length; dry mass of leaves, stem, root and total; Dickson Quality Index (DQI). The dada were submitted to the analysis of variance and analysis of regression. The plant height, neck diameter, root length and dry mass of leaves, stem, root and total were set by linear equations, suffering upward effect as the doses were increased. The number of leaves and the DQI were adjusted for cubic equations with maximum efficiency in doses 542.52 g.m-³ with 5.2 leaves and 535.68 g.m-³ with 3.90 index. It is concluded that the phosphorus is really a fundamental element for the initial development of assai palm, promoting a greater increase of aerial part and biomass when in high availability

Linking shifts in bacterial community with changes in dissolved organic matter pool in a tropical lake

Bacterioplankton communities have a pivotal role in the global carbon cycle. Still the interaction between microbial community and dissolved organic matter (DOM) in freshwater ecosystems remains poorly understood. Here, we report results from a 12-day mesocosm study performed in the epilimnion of a tropical lake, in which inorganic nutrients and allochthonous DOM were supplemented under full light and shading. Although the production of autochthonous DOM triggered by nutrient addition was the dominant driver of changes in bacterial community structure, temporal covariations between DOM optical proxies and bacterial community structure revealed a strong influence of community shifts on DOM fate. Community shifts were coupled to a successional stepwise alteration of the DOM pool, with different fractions being selectively consumed by specific taxa Typical freshwater clades as Limnohabitans and Sporichthyaceae were associated with consumption of low molecular weight carbon, whereas Gammaproteobacteria and Flavobacteria utilized higher molecular weight carbon, indicating differences in DOM preference among Glades. Importantly. Verrucomicrobiaceae were important in the turnover of freshly produced autochthonous DOM, ultimately affecting light availability and dissolved organic carbon concentrations. Our findings suggest that taxonomically defined bacterial assemblages play definite roles when influencing DOM fate, either by changing specific fractions of the DOM pool or by regulating light availability and DOC levels. (C) 2019 Elsevier B.V. All rights reserved.Peer reviewe

Avaliação de gramíneas na microrregião do Médio-Mearim, MA.

Em Bacabal, MA, Foram avaliados o rendimento forrageiro, a percentagem de folhas e de FDN e FDA de Brachiaria brizantha cv. Marandu. Brachiaria decumbens cv. Basilisk, Panicum maximum cvs. Massai, Mombaça, Tanzânia e Tobiatã. O plantio foi realizado no inicio das chuvas (janeiro) de 1999 e os cortes para avaliação, em número de oito, realizaram-se de abril de 1999 até julho de 2000. Foi usado o delineamento inteiramente casualizado com parcelas de 3 x 5 m e três repetições.Editores: Ângela Maria Vieira Batista; Severino Benone Paes Barbosa; Mércia Virginia Ferreira dos Santos; Lúcia Maia Cavalcanti Ferreira