Síndrome de Ménière: diagnóstico etiológico

The correct identification of the etiology of Ménière’s syndrome is possible in up to 50% of all cases; once the underlying cause is identified, it can be managed, and that usually results in significant improvement in the set of symptoms. The objective of the present paper is to discuss the main diseases associated to the genesis of Ménière’s in terms of prevalence, etiopathogenic mechanisms, and prognostic implications. In addition, the paper presents a flow chart that can serve as a guide for etiologic research in Ménière’s syndrome.A correta identificação da etiologia da síndrome de Ménière, alcançada em até 50% dos casos, permite, via de regra, uma melhora significativa do quadro, através do manejo da doença de base. O presente estudo objetiva discutir as principais doenças possivelmente associadas à gênese da síndrome de Ménière, enfocando prevalência, mecanismo etiopatogênico, implicação prognóstica. Além disso, apresentamos um fluxograma que serve como guia de busca etiológica para a síndrome de Ménièr

Modeling of impact deformation processes of the ceramic container for radioactive waste storage

Results of researches in the field of designing containers for storage of radioactive materials are presented in the work. The purposes of researches include a development of an effective method of modeling static and dynamic deformation processes at shock impact on the ceramic container with radioactive materials at transportation. The next tasks have been solved: on the basis of the mathematical description of physic-mechanical processes of deformation of the complex design container has been chosen method of finite-element's for effective modeling of the stress-strain State of static and dynamic deformation processes in the containers made of ceramic elements; laws of deformation, estimations of durability and rigidity for designed containers have been received after calculations by means of the computer software; recommendations on perfection of a design of the container for maintenance of requirements to safety are given. Analysis Finite Element Method (FEM) has been conducted in the ANSYS system and results is presented

Corn root morphoanatomy at different development stages and yield under water stress.

The objective of this work was to characterize the morphoanatomy of roots and the yield traits of two corn hybrids contrasting for drought tolerance (DKB 390, tolerant; and BRS 1030, sensitive), at different stages of development. Water deficit was imposed for ten days, in a greenhouse, at three growth stages: V5, VT, and R3. These treatments were combined to generate cumulative stress during the plant cycle, as: V5VT, V5R3, VTR3, and V5VTR3. The following were analyzed: root anatomy; proportion of aerenchyma in the cortex; metaxylem number and diameter; phloem thickness; as well as morphological characteristics, such as root length, volume, and surface area, specific root length, length of fine roots, grain yield, and ear length and diameter. Development stage affected the responses to stress: DKB 390 showed the best performance for root morphoanatomy and yield traits, under drought stress, at the reproductive stages, mainly R3, and in the treatments with cumulative stress, especially V5VTR3; whereas BRS 1030 presented higher means for the studied parameters, mainly at the V5 and VT stages, but did not show a higher grain yield under water stress. The greater tolerance of the DKB 390 hybrid to water deficit is probably linked with a memory of pre?exposure to water stress at different growth stages

Caracterização do sistema radicular e dos componentes da produtividade em quatro genótipos de milho cultivados sob déficit hídrico.

Nesse trabalho foram combinadas avaliações de parâmetros agronômicos com morfometria de raízes usando o programa WinRhizo, a fim de detectar características no sistema radicular que permitam a manutenção da produtividade em quatro materiais genéticos de milho (BRS1010, 2B710, DKB390 e BRS1055), cultivados em dois níveis de água no solo (CC- capacidade de campo, e DH- déficit hídrico). Plantas oriundas dos genótipos DKB390 e BRS1055 sob DH mantiveram valores de produção de grão similares aos de seus respectivos controles, sob CC. Por sua vez, plantas oriundas dos genótipos 2B710 e BRS1010 apresentaram perdas substanciais na produção de grãos com a imposição do DH. Cabe ressaltar que plantas oriundas do genótipo BRS 1055 apresentaram estratégia abaixo do solo de evitação à seca, por aumentarem a área superficial de raízes finas e muito finas, sendo esse um ponto de divergência em relação ao também tolerante genótipo DKB 390.bitstream/item/122152/1/bol-111.pd