ABSTRACT
Objective To evaluate and compare the short-term effects of two kinds of plastic mulch on Oncomelania hupensis snail control in irrigation and drainage ditches with snails in Yunnan Province. Methods The irrigation and drainage ditches with high density of Oncomelania hupensis snails were chosen as the investigation sites,and then 4 groups were set,namely a colorless plastic mulch group,black plastic mulch group,colorless plastic mulch with molluscicide group and black plastic mulch with molluscicide group. The snail situation of the 4 groups was surveyed before the experiment and 7,14,21,30 days after covering plastic mulch,and the snail death rates were compared among the 4 groups. Meanwhile,the hourly temperatures of soil surface,soil surface under plastic mulch and soil layer 5,15 cm under the surface as well as the weather situation during the study period were measured and recorded. Results The average snail mortality rate of the colorless plastic mulch group was only 15.29% that was higher than that of the black plastic mulch group(6.56%)(P 0.05). Both kinds of plastic mulches could raise the temperature of the soil surface under plas-tic mulch and the soil layer below it,and the temperature of soil under the mulches increased over the cover time,and the aver-age temperature of the soil surface under the black mulch in 30 days was higher than that under the colorless mulch. Conclu-sion It is not suitable to use plastic mulch only in irrigation and drainage ditches with snails widely in Yunnan Province be-cause of its low effect,and if necessary,the molluscicide should be added.
ABSTRACT
Objective:To study the influence of triptolide on neutrophils asthmatic mice of WBC and EOS in bronchoalveolar lavage fluid.Methods:Using ovalbumin ( OVA) combined with lipopolysaccharide ( LPS) method to establish sensitized asthmatic mice,BALB/c mice were randomly divided into 32 neutrophilic asthma group ( NA group ) , neutrophil triptolide intervention group (TLN group),neutrophil dexamethasone group (DXN group) and normal control group (NC group),n=8,hemocytometer calculated for each group of mice bronchoalveolar lavage fluid ( BALF) of the total number of WBC and EOS;smears stained Switzerland View in-flammatory cell infiltration.Results: In bronchioalveolar lavage fluid, numbers and infiltrations of WBC and EOS were significantly decreased in the DXN,TLN group than those in the NA group(P<0.05);but were significantly higher than the NC group (P<0.05), the DXN group above parameters were significantly higher than the TLN group ( all P<0.05 ) .Conclusion: Triptolide can reduce the total number of BALF WBC and EOS,inhibit lung WBC,EOS infiltration,ease neutrophilic airway inflammation.