Showing papers by "Ministry of Agriculture published in 1990"

X- and gamma -rays computerized minitomograph scanner for soil science

Abstract: A computerized tomograph scanner system that uses X- and gamma -rays for applications in soil science is described. Use of the apparatus in measuring volumetric water content to an accuracy of +or-3% and soil bulk density to +or-2% (in grams per cubic centimeters) is discussed. The system features translation and rotation scanning modes, a 200-mm effective field of view, signal processing by pulse counting, and 1.0-mm spatial resolution. The system's advantages over classical methods are listed, principles of the tomographic method and physical considerations are presented, and the system's design is described. >

Packaging machine for manufacture, filling and sealing of sachets

Abstract: A packaging machine for manufacturing sachets including a first pair of jaws for the a transversally pressure and heat sealed tube from a strip of pressure and heat sealable material formed by tangentially counter-rotating gripper controlled by an actuator with a continuous movement of the cyclical type, in which the tangentially counter-rotating gripper is constructed in the form of opposite pressure and heat sealing jaws and at least one of these jaws is controllable with an adjustable and the actuator with a continuous movement are designed to adjust, in conjunction with the thrust action, the pressure and heat sealing time as a function of the thickness and constituent structure of the pressure and heat sealable material used.

Avaliação da vacina anti-rábica ERA, frente a variantes antigênicas do vírus da raiva, em diferentes períodos pós-imunização

Abstract: Avaliou-se, em camudongos, os niveis de protecao conferidos por uma vacina anti-rabica atenuada, preparada em cultura de tecido renal a partir da amostra ERA, frente a diferentes variantes antigenicas dos virus da raiva. Utilizaram-se dois esquemas de vacinacao, representados por uma unica dose e por 6 doses aplicadas em dias alternados. Os diferentes camundogos dos grupos experimentais foram desafiados, em diversos periodos pos-imunizacao (15, 30, 60 e 120 dias), com variantes procedentes de caes (Sao Paulo e Nigeria), de morcego (DR-19 e Pernambuco), de raposa (Rio Grande do Norte) e CVS "Challenge Virus Standard". Os resultados obtidos permitiram constatar que a vacina ERA foi eficaz contra todas as variantes de rua e silvaticas do virus rabico, independentemente do esquema vacinal. Contra as cepas adaptadas no laboratorio DR-19 e CVS, quando aplicada em uma unica dose, sua eficacia foi menor do que quando aplicada em 6 doses.