Wood is a material widely used in various sectors of construction, such as in structures and building components. The volume of wood extracted from tropical forests has reached a considerable amount, and this wood is marketed with popular names without prior characterization. Wood density is an easy property to measure, and its use as an estimator of other properties is very common in this sector. This study investigated the possibility of the estimation of important quantities in dimensional stability of Brazilian tropical woods by using the density at 12% moisture content, anhydrous density, and basic density. Testing the ability to estimate radial, axial, tangential, and volumetric shrinkage, anisotropy coefficient, coefficient of volumetric rate of volumetric shrinkage, as well as the rate of volumetric swelling using the densities above, with linear, exponential, geometric, and logarithmic models, the best determination coefficient was: R 2 = 19.58%. The results were, in summary, that the variable density was not a good estimator of the dimensional stability of the wood.
Endophytes are being considered for use in biological control, and the enzymes
they secrete might facilitate their initial colonization of internal plant
tissues and direct interactions with microbial pathogens. Microbial proteases
are also biotechnologically important products employed in bioremediation
processes, cosmetics, and the pharmaceutical, photographic and food industries.
In the present study, we evaluated antagonism and competitive interactions
between 98 fungal endophytes and Alternaria alternata,
Colletotrichum sp., Phyllosticta
citricarpa and Moniliophthora perniciosa. We also
examined the proteolytic activities of endophytes grown in liquid medium and
conducted cup plate assays. The results showed that certain strains in the
assemblage of P. hispidum endophytes are important sources of
antifungal properties, primarily Lasiodiplodia theobromae
JF766989, which reduced phytopathogen growth by approximately 54 to 65%. We
detected 28 endophytes producing enzymatic halos of up to 16.40 mm in diameter.
The results obtained in the present study highlight the proteolytic activity of
the endophytes Phoma herbarum JF766995 and
Schizophyllum commune JF766994, which presented the highest
enzymatic halo diameters under at least one culture condition tested. The
increased activities of certain isolates in the presence of rice or soy flour as
a substrate (with halos up to 17.67 mm in diameter) suggests that these
endophytes have the potential to produce enzymes using agricultural wastes.
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We present coordinates and available photometric information (either from previous or recent broadband UBV observations, and near-infrared photometry from the 2MASS Point Source Catalog) for 12,056 stars (11,516 of which are unique) identified in the HK Survey of Beers and colleagues as candidate field horizontal-branch or A-type stars. These stars, in the apparent magnitude range 10 B 16:0, were selected using an objective-prism/interferencefilter survey technique. The availability of 2MASS information permits assembly of a cleaned version of this catalog, comprising likely blue horizontal-branch (BHB) stars or blue stragglers in the color interval [À0:2 (B À V ) 0 þ0:2], which are of particular interest for investigation of the structure, kinematics, and dynamics of the thick disk and inner halo of the Milky Way, the total mass and mass profile of the Galaxy, and as potential foreground/background objects in efforts to bracket distances to high-velocity clouds of H i. A comparison of the stars classified as highlikelihood BHB candidates with previous classifications based on UBV photometry and medium-resolution spectroscopy indicates that this class contains 78% correct identifications.
The knowledge about anisotropy of wood possibility more security design of structures and structural members designed. Therefore, there are little quantity of results knowledge about shrinkage and anisotropy coefficients of Wood species, motivating the development of new researches. The aim of research is evaluate the possibility of estimate the full shrinkage (radial; tangential; volumetric), anisotropy coefficient and shrinkage coefficient (radial; tangential; volumetric), using polynomial regression models (linear; quadratic; cubic) and exponential, by density of five Wood species (Cedro Doce [C20]; Canafístula [C30]; Angelim Araroba [C40]; Mandioqueira [C50]; Angelim Vermelho [C60]), properly classifieds in five strength classes for dicotyledonous according Brazilian Standard ABNT NBR 7190:1997. The better results were from tangential and volumetric retractions both using exponentials functions, justified by lower values of variation coefficients, with coefficients values of determination adjusted ranging from 51 and 54%. Even considered significant to the regressions for the tangential and volumetric shrinkage by analysis of variance, but with adjusted coefficients of determination lower than 70%, news researches should realized with other Wood species, enabling find general expressions for estimating such properties using the knowledge of the density.
Estudantes de medicina constituem um grupo muito suscetível ao desenvolvimento de Transtornos Mentais Comuns (TMC). A necessidade de acompanhamento dos estudantes de medicina motivou um levantamento em um curso de Medicina. Utilizou-se o GHQ-12. Dos 631 alunos obteve-se 67,82% (428) de cobertura. A prevalência de TMC atingiu 58,8% dos discentes, com maior ocorrência no terceiro ano e nos últimos dois anos. Os resultados demonstram a necessidade de suporte acadêmico, para evitar desdobramentos graves e danosos à saúde mental, como também para uma melhora no acolhimento exercido aos seus futuros pacientes, ampliando a qualidade e humanizando a medicina.
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