AIM: To observe the anticonvulsant action of L-histidine in mice. METHODS: The anticonvulsant effect of L-histidine, and the antagonism of dl-chlorpheniramine to L-histidine were observed in convulsion mice induced by pentylenetetrazole (PTZ) and electric stimulation. RESULTS: L-histidine exerted remarkable anticonvulsant action with dose-response relationship in convulsion mice induced by pentylenetetrazole and electric stimulation, and the action was partly antagonized by dl-chlorpheniramine. CONCLUSION: L-histidine has anticonvulsant effect, and the action was partly antagonized by dl-chlorpheniramine, suggesting that L-histidine can pass the BBS and enter the central nervous system.

AIM: To compare the effects of histamine and its antagonists on tension of isolated rabbit basilar and mesenteric artery in vitro, and to observe the role of Ca 2+ in histamine induced response. METHODS: The dose response curves induced by histamine were recorded on the isolated rabbit central and peripheral arteries in different doses of diphenhydramine, cimitidine, and nifidipine. RESULTS: Histamine could cause contraction of basilar and mesenteric isolated arteries. Diphenhydramine and nifidipine antagonized these effects, while cimitidine enhanced this effect. CONCLUSION: There may be different receptors densities in different rabbit arteries; histamine shows the vasoconstrictive effect on both brain and mesenteric arteries; and the vasoconstrictive effect mainly produces via Ca 2+ inflax.

Objectives To evaluate the effect of the positive psychology intervention on SWB in elderly patients with chronic obstructive pulmonary disease(COPD).Methods A total of 108 patients with COPD were divided into control group and intervention group according to the principle of control matches,with 54 patients in each group.Patients in intervention group received a period of three months of positive psychology oriented psychological journal ,patients in control group were blank.Before and after the intervention,both groups of patients were assessed by Memorial University of Newfoundland Scale of Happiness (MNusH) and 12 General Health Questionnaire (GHQ-12),and used t tests andx2 test to compare two groups of patients,as well as the intervention group itself differences.Results After the intervention,the score of MNusH in the intervention group was (35.8 ± 8.3),which was significant higher than that of in the control group,t=7.110,P ＜0.05.The scores of positive emotion and positive experience of MNusH Scale of patients in intervention group were higher than control group,the scores of negative emotions and negative experience of patients in intervention group were lower than control group,the difference was statistically significant,t value was 3.269,6.878,8.156 and 7.801respectively,P ＜0.05.The intervention significantly reduced the incidence of psychological disorder of patients,x2=42.335,P＜0.05.Conclusion Positive psychology interventions can effectively improve negative emotions of the elderly hospitalized COPD patients,improve SWB of the elderly patients with COPD.