SUMMARY: In 2004, Xiphopenaeus kroyeri, one of major species in commercial fisheries in Brazil was included in the list of brazilian overfished species and, in 2006, two cryptic species were identified in the Atlantic Ocean by molecular approaches: Xiphopenaeus sp. I and II. In 2019, Carvalho-Batista et al. described both Xiphopenaeus sp. I and Xiphopenaeus sp. II and these species were named X. kroyeri and X. dincao, respectively. This study aimed at performing morphometric analysis in order to identify potential fishing stocks of X. kroyeri sensu strictum along Brazilian coast. The results obtained separate Caravelas, Atafona and Balneário Camboriú from all the other populations studied and showed three groups: Ubatuba, Nova Almeida; Ubatuba, Cananéia; Ubatuba, Santos. These results indicate that the maritime limits practiced in closed seasons along Brazil are embracing the detected morphometric stock boundaries observed for Xiphopenaeus kroyeris.s.

RESUMEN: En 2004, Xiphopenaeus kroyeri, una de las principales especies de la pesca comercial en Brasil, fue incluida en la lista de especies brasileñas sobre explotadas y, en 2006, se identificaron dos especies crípticas en el Océano Atlántico mediante enfoques moleculares: Xiphopenaeus sp. I y II. En 2019, Carvalho-Batista et al. describieron tanto Xiphopenaeus sp. I y Xiphopenaeus sp. II y a estas especies denominaron X. kroyeri y X. dincao, respectivamente. Este estudio tuvo como objetivo realizar un análisis morfométrico con el fin de identificar posibles poblaciones de pesca de X. kroyeri sensu strictum a lo largo de la costa brasileña. Los resultados obtenidos en Caravelas, Atafona y Balneário Camboriú se separaron de todas las demás poblaciones estudiadas y mostraron tres grupos: Ubatuba, Nova Almeida; Ubatuba, Cananéia; Ubatuba, Santos. Estos resultados indican que los límites marítimos practicados en temporadas de veda a lo largo de Brasil están abarcando los límites de stock morfométricos observados para Xiphopenaeus kroyeris.s.

Abstract This paper presents an exact solution for the boundary-value problem which describes the linear buckling of axially-compressed cylindrical panels with frames attached to the circular edges. The boundary conditions differ from the classical simply supported ones, often assumed for design purposes, in the sense that the torsion resisted by the frames are also taken into account. The quality of the results reported herein may be valuable benchmark data.

Abstract Small strains are consistently incorporated into a large rotation piezoelectric beam theory, where the displacement is assumed to vary in accordance with the Timoshenko assumption and the electric potential has linear variation through each piezoelectric layer thickness. A finite element for planar frames, based on the total Lagrangian description, is then developed. The displacements and rotation are linearly approximated over the element and the voltage in a piezoelectric sensor layer is taken to be constant. In addition to the well-known membrane and shear lockings, it is disclosed the presence of locking in the application of Gauss law to the piezoelectric sensor layers. All the mechanical and electrical contributions to the internal load vectors are evaluated using a reduced one-point Gaussian quadrature to make this simple element efficient. No spurious modes are introduced in this process. An incremental-iterative approach, based on the Newton-Raphson algorithm, is employed in the solutions of the numerical examples to illustrate the large rotation capability of the developed model.

Em condições controladas de temperatura, umidade e iluminação, 30 genótipos de Panicum maximum foram avaliados para a verificação de tolerância às doses de alumínio de 0, 12 e 24 mg L-1 em solução nutritiva. Os efeitos do alumínio na inibição do alongamento radicular e no índice de tolerância possibilitaram a estratificação dos genótipos em três categorias: tolerantes, intermediários e sensíveis. A maior parte dos genótipos apresentou de média a baixa tolerância ao alumínio, destacando-se, como os mais tolerantes, os genótipos K191, T95, T84, T91 e Centenário e, como os mais sensíveis, os genótipos Centauro, K68, K214 e T46.

Thirty Panicum maximum Jacq. genotypes were screened for aluminum tolerance at aluminum rates 0, 12 e 24 mg L-1 in nutrient solution. The effects of the aluminum in Al-induced inhibition of root elongation and Al-tolerance index allowed classification into three different Al tolerance groups: tolerant, medium and sensitive. Most of the genotypes presented moderate even low tolerance to aluminum toxicity, although K191, T95, T84, T91, Centenário were Al-tolerant and Centauro, K68, K214, T46 were Al-sensitive genotypes.

Em casa de vegetação da Escola Superior de Agricultura "Luiz de Queiroz", em Piracicaba (SP), no período de janeiro a agosto de 1992, foi desenvolvido um experimento com amostra superficial de um latossolo vermelho-amarelo textura argilosa. Utilizou-se um esquema fatorial 4 x 3 x 4, com doses de calcário (0; 380; 760 e 1.140 mg kg-1 de terra), doses de potássio (0; 40 e 120 mg kg-1 de terra) e quatro cultivares de alfafa (Crioula, Moapa, Florida 77 e CUF 101). O delineamento experimental foi o de blocos ao acaso, com quatro repetições. Efetuou-se o primeiro corte 70 dias após a semeadura, enquanto o segundo corte foi realizado entre 34 e 41 dias após o primeiro. Os cultivares de maior rendimento de matéria seca no primeiro corte foram Florida 77 e CUF 101, que se igualaram aos cultivares Crioula e Moapa no segundo corte. As máximas produções de matéria seca e quantidades totais de nitrogênio estimadas corresponderam às doses de calcário dolomítico entre 886 e 1.095 mg kg-1, que elevaram a saturação por bases do solo para 64,8 a 68,6%, enquanto, para o potássio, esses pontos de máximo foram estimados para doses entre 44,7 e 74,2 mg kg-1. Sintomas visuais de deficiência de potássio foram observados na alfafa, nos tratamentos sem adubação potássica.

An experiment was carried out in a greenhouse, with the surface layer of a clayey Red Yellow Latosol placed in plastic pots. A 4x3x4 factorial was used. Lime rates (0; 380; 760 and 1140 mg kg-1 of soil) and potassium rates (0; 40 and 120 mg kg-1 of soil) and alfalfa cultivars (Crioula, Moapa, Florida77 and CUF101) were studied. A randomized complete block design, with four replications, was used. Plants were harvested 70 days after sowing and allowed to regrow. A second harvest was done between 34 to 41 days after the first one. Florida77 and CUF101 cultivars had the highest dry matter yield at the first harvest, but all the cultivars had similar yields at the second harvest. Maximum DM yield and total amount of nitrogen were estimated to occur with dolomitic limestone rate between 886 and 1095 mg kg-1 (soil base saturation between 64.8 and 68.6%), whereas for potassium they were estimated between 44.7 and 74.2 mg kg-1 . Visual symptoms of potassium deficiency were observed in plants grown in the soil that did not receive potassium fertilization.