659 research outputs found
Nonlinear Schrodinger equation with chaotic, random, and nonperiodic nonlinearity
In this paper we deal with a nonlinear Schr\"{o}dinger equation with chaotic,
random, and nonperiodic cubic nonlinearity. Our goal is to study the soliton
evolution, with the strength of the nonlinearity perturbed in the space and
time coordinates and to check its robustness under these conditions. Comparing
with a real system, the perturbation can be related to, e.g., impurities in
crystalline structures, or coupling to a thermal reservoir which, on the
average, enhances the nonlinearity. We also discuss the relevance of such
random perturbations to the dynamics of Bose-Einstein Condensates and their
collective excitations and transport.Comment: 4 pages, 6 figure
Avaliação sensorial de uvas de mesa produzidas na região do Vale do São Francisco.
Com o objetivo de apoiar as pesquisas da Embrapa, que visam a seleção e adaptação de novas cultivares de videira para consumo in natura no Submédio do Vale do São Francisco, este trabalho avaliou a aceitação junto híbridos potenciais e de variedades de uvas com semente que não são comumente comercializadas na região
Oral Complications of HIV Disease
Oral lesions are among the early signs of HIV infection and can predict its progression to acquired immunodeficiency syndrome (AIDS). A better understanding of the oral manifestations of AIDS in both adults and children has implications for all health care professionals. The knowledge of such alterations would allow for early recognition of HIV-infected patients. The present paper reviews epidemiology, relevant aspects of HIV infection related to the mouth in both adults and children, as well as current trends in antiretroviral therapy and its connection with orofacial manifestations related to AIDS
Distinct fos-expressing neuronal ensembles in the ventromedial prefrontal cortex mediate food reward and extinction memories
In operant learning, initial reward-associated memories are thought to be distinct from subsequent extinction-associated memories.
Memories formed during operant learning are thought to be stored in “neuronal ensembles.” Thus, we hypothesize that different
neuronal ensembles encode reward- and extinction-associated memories. Here, we examined prefrontal cortex neuronal ensembles
involved in the recall of reward and extinction memories of food self-administration.Wefirst trained rats to lever press for palatable food
pellets for 7 d (1 h/d) and then exposed them to 0, 2, or 7 daily extinction sessions in which lever presses were not reinforced. Twenty-four
hours after the last training or extinction session, we exposed the rats to either a short 15 min extinction test session or left them in their
homecage (a control condition). We found maximal Fos (a neuronal activity marker) immunoreactivity in the ventral medial prefrontal
cortex of rats that previously received 2 extinction sessions, suggesting that neuronal ensembles in this area encode extinction memories.
We then used the Daun02 inactivation procedure to selectively disrupt ventral medial prefrontal cortex neuronal ensembles that were
activated during the 15 min extinction session following 0 (no extinction) or 2 prior extinction sessions to determine the effects of
inactivating the putative food reward and extinction ensembles, respectively, on subsequent nonreinforced food seeking 2 d later.
Inactivation of the food reward ensembles decreased food seeking, whereas inactivation of the extinction ensembles increased food
seeking. Our results indicate that distinct neuronal ensembles encoding operant reward and extinction memories intermingle within the
same cortical area
Efeitos da desfolha e desponte de ramos sobre a composição físico química de Syrah elaborados em dois ciclos de produção no Vale do São Francisco.
O objetivo deste estudo foi avaliar a influência de diferentes tratamentos de despontes de ramos e desfolha sobre a composição físico-química do vinho da variedade Syrah produzidos no Submédio do Vale do São Francisco com uvas colhidas em diferentes épocas do ano
Trocas gasosas em videira Syrah sobre dois sistemas de condução.
O objetivo deste trabalho foi avaliar as trocas gasosas em videira Syrah (Vitis vinifera L.) cultivada em dois sistemas de condução no Submédio do São Francisco
Revisiting an Unfinished Business: the Genome Content of Elaeis guineensis, E. oleifera and its Inter-specific Hybrid.
Caracterização do índice de pigmentos em videira Syrah cultivada em dois sistemas de condução no Submédio São Francisco, PE.
O objetivo deste trabalho foi avaliar e o índice relativo de clorofila em plantas de videira cultivadas em dois sistemas de conduçã
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