28 research outputs found
å± å Žã®äœæž©å®€å ã«ãããToxoplasma gondiiã®çåæéã«é¢ããç 究
Examination was made of the survival period of Toxoplasma gondii in the low temperature rooms of a slaughterhouse. Materials for the examination were the mouse bodies themselves and the organs, such as the liver and brain, of mice infected with the RH or Beverley strain. These materials were stored in both of the refrigerating and the cold-storage rooms, then taken out of the rooms one after another at a short interval and examined on the existence of live Toxoplasma in them with the intraperitoneal inoculation into healthy mice. In the first experiment, it was revealed that the survival of the proliferative form of Toxoplasma in an infected mouse body was 8 days in the refrigerating room and 4 days in the cold-storage room, but a putrefactive sign was manifesting slowly in the mice stored more than 13 days in the refrigerating room and 6 days in the other. In the following experiment, the livers excised from RH-infected mice and the brains from Beverley-infected ones were stored only in the refrigerating room. It was recognized as the result that cysts were capable of survival for as long as 67 days and proliferative forms could survive for 11 days in the room. A control experiment was attempted on the resistance of T. gondii to -14â in a freezer and it was shown that both forms of this protozoa in the infected mouse organs could remain alive more than an hour but did not for 3 hours in a freezer of -14â. Temperatures in both rooms were continuously measured by auto-recording thermometers. In the refrigerating room, it was 0.47â in average and the cold-storage room always had 3 to 4â higher temperature than the refrigerating room.Toxoplasma gondiiã®äœæž©ã«å¯Ÿããæµææ§ã«ã€ããŠã®å ±åã¯å°ãªããªãããããããããã®ç 究ã§ã¯ãå®éšå®€å
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ããŠã¹æ¥çš®æ³ããã³è¢å æäœæ³ã«ããå± æ®ºè±ããã®Toxoplasma gondiiã®æ€åºã«ã€ããŠ
Ninety five pigs suspicious of Toxoplasma-infection were selected from 18,867 ones killed at Isahaya City Slaughterhouse and used for the isolation of T. gondii with mouse inoculations of their hilar or hepatic lymph nodes and also for the microscopic detection of the parasite in the lymph nodes with direct fluorescent antibody technic. In the mouse inoculation method, Toxoplasma hemagglutination test was carried out with sera of mice killed 6 weeks after the inoculation of the lymph nodes into the mice. Further, T. gondii strains newly isolated were subinoculated into mice and hamsters to investigate their virulence. The isolation rate of T. gondii was 8/95 or 8.4%, while 33 of 95 (34.7%) were positive in hemagglutination test. Fluorescent antibody technic indicated a positive response in 19 of 95 pig lymph nodes (20.0%). Eight T. gondii strains were isolated and demonstrated a high virulence for mice and hamsters. In this paper, the methods used and the above mentioned results are stated in detail and discussed.é·åŽçè««æ©åžç«å± å Žã«1966幎12æãã1967幎3æãŸã§ã«æ¬å
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Enhanced Nogo-P3 amplitudes of mothers compared with non-mother women during an emotional Go/Nogo task
Background: It is known that emotion regulatory responses of humans are changed by the experiences they have, but in particular, they are changed by becoming a mother. A recent study has found how a woman's emotion regulatory response to a child's crying changes after becoming a mother. However, mothers' emotion regulatory responses other than those to children and the association between emotion regulatory response and parental stress are still unknown. Methods: Eighteen healthy Japanese females (nine mothers and nine non-mothers) participated in the experiment. They performed an emotional Go/Nogo task, with facial expressions of others (angry, happy, and neutral faces) used as emotional stimuli. The percentage of correct responses, response time, and event-related potentials (ERPs) during the task was measured. Results: This comparison revealed that the mother group had a larger P3 (Nogo-P3) amplitude than the non-mother group when Nogo trials were held. This indicates that in mothers, there was greater activation of the behavioral inhibition-related brain areas than in non-mother women when they inhibited inappropriate behavior following recognition of facial expressions of others. In addition, in the mother group, there was a negative correlation between parental stress levels and Nogo-P3 amplitudes evoked by angry faces. This suggests that there is a relation between the level of parental stress of mothers and their emotion regulatory responses to angry faces. Conclusions: Our results demonstrate that mothers' emotion regulatory processes may differ from those of non-mothers in response, not only to a child's crying but also to expressions of emotions by others, and also suggest that the inhibitory recognition activity of mothers can be affected by parental stres
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å± å Žã®äœæž©å®€å ã«ãããToxoplasma gondiiã®çåæéã«é¢ããç 究
Examination was made of the survival period of Toxoplasma gondii in the low temperature rooms of a slaughterhouse. Materials for the examination were the mouse bodies themselves and the organs, such as the liver and brain, of mice infected with the RH or Beverley strain. These materials were stored in both of the refrigerating and the cold-storage rooms, then taken out of the rooms one after another at a short interval and examined on the existence of live Toxoplasma in them with the intraperitoneal inoculation into healthy mice. In the first experiment, it was revealed that the survival of the proliferative form of Toxoplasma in an infected mouse body was 8 days in the refrigerating room and 4 days in the cold-storage room, but a putrefactive sign was manifesting slowly in the mice stored more than 13 days in the refrigerating room and 6 days in the other. In the following experiment, the livers excised from RH-infected mice and the brains from Beverley-infected ones were stored only in the refrigerating room. It was recognized as the result that cysts were capable of survival for as long as 67 days and proliferative forms could survive for 11 days in the room. A control experiment was attempted on the resistance of T. gondii to -14â in a freezer and it was shown that both forms of this protozoa in the infected mouse organs could remain alive more than an hour but did not for 3 hours in a freezer of -14â. Temperatures in both rooms were continuously measured by auto-recording thermometers. In the refrigerating room, it was 0.47â in average and the cold-storage room always had 3 to 4â higher temperature than the refrigerating room.Toxoplasma gondiiã®äœæž©ã«å¯Ÿããæµææ§ã«ã€ããŠã®å ±åã¯å°ãªããªãããããããããã®ç 究ã§ã¯ãå®éšå®€å
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