RESUMO
When Ca2+ is released from internal stores in living cells, the resulting wave of increased concentration can travel without deformation (continuous propagation) or with burst-like behavior (saltatory propagation). We analyze the "fire-diffuse-fire" model in order to illuminate the differences between these two modes of propagation. We show that the Ca2+ release wave in immature Xenopus oocytes and cardiac myocytes is saltatory, whereas the fertilization wave in the mature oocyte is continuous.
Assuntos
Cálcio/metabolismo , Modelos Biológicos , Miocárdio/metabolismo , Oócitos/fisiologia , Animais , Feminino , Fertilização , Líquido Intracelular/metabolismo , Cinética , XenopusRESUMO
Serologic tests for bluetongue virus (BTV) were done on 19,758 blood serum samples systematically collected at brucellosis laboratories throughout the United States from Nov 28, 1977 to Feb 20, 1978. Prevalence of BTV antibody varied from 0 to 79% of the samples collected in various states, with a national prevalence of 18.2%. The prevalence was generally low in the northern states and high in the southwestern states. The highest prevalence rates were found in Puerto Rico and the Virgin Islands.
Assuntos
Bluetongue/epidemiologia , Doenças dos Bovinos/epidemiologia , Animais , Bovinos , Porto Rico , Ovinos , Estados Unidos , Ilhas Virgens AmericanasRESUMO
En 1978, se presento en la Republica Dominicana un brote epizootico de EEE de proporciones aparentemente considerables. Este articulo describe las medidas tomadas para investigarlo y combatirlo
Assuntos
Vírus da Encefalite Equina do Leste , Encefalomielite EquinaRESUMO
Sera from male mule deer (Odocoileus hemionus) collected in November 1977 in Otero County, New Mexico were tested fro antibodies to bovine virus diarrhea virus (BVDV), bluetongue virus (BTV), and epizootic hemorrhagic disease virus (EHDV). Neutralizing antibodies were detected in 26 of 76 (34%) sera tested for BVDV (titer greater than or equal to 1:16). Of 46 sera tested for antibodies to BTV and EHDV, 10 (22%) and 3 (7%), respectively, were positive. Three (7%) of 46 sera were suspect (titer < 1:20) for BTV, and 18 (38%) sera were suspect (titer < 1:20) for EHDV.
Assuntos
Anticorpos Antivirais/análise , Vírus Bluetongue/imunologia , Cervos/imunologia , Vírus da Diarreia Viral Bovina/imunologia , Pestivirus/imunologia , Reoviridae/imunologia , Animais , Testes de Neutralização , New MexicoAssuntos
Encefalomielite Equina/epidemiologia , Animais , República Dominicana , Feminino , Cavalos , MasculinoRESUMO
Phesants (Phasianus colchicus) and chukars (Alectoris graeca) were inoculated with Venezuelian equine encephalitis virus. Antibody titers reached a peak 2 weeks postinoculation and the declined. Viremia was of short duration, clinical signs were not detected, and unionculated cage mates did not develop antibody titers.