In a previous study by the authors,positive results from both a case-control study and a cohort study were reported.In the present study a short-term test for the induction of mouse lung tumor by chloroprene was condu...In a previous study by the authors,positive results from both a case-control study and a cohort study were reported.In the present study a short-term test for the induction of mouse lung tumor by chloroprene was conducted to confirm whether chloroprene monomer itself can induce tumors.Kunming albino mice weaned at 2 weeks were subjected to inhaling 0,2.9±0.3, 19.2±1.9,and 189.0±13.3 mg/m^3 chloroprene(GC purity,99.8%)4 h daily(except Sunday) for 7 months.All survivors were killed at the end of the 8th month or when moribund.No lung tumors were found before the 6th month.Thus,survivors at the 6th month were counted as effective animals.Most lung tumors observed were papilloadenomas(50/57),and a few were adenomas(7/57).The tumor incidence in the 2.9 mg/m^3 group was 8.1% in comparison to 1.3% in the control group,with the significance level at P<0.05.The higher the concentration,the higher the incidence.Examination of the multiplicity of tumor induction also demonstrated a dose-response relationship,and the number of tumors per mouse in the 189 mg/m^3 group was significant at P<0.01.1989 Academic Press,Inc.展开更多
An introduction and observation test was carried out to 8 tomato varieties in cement arch plastic greenhouse. The results showed that the tested variety 10-2 exhibited the highest average yield of 61 520.9 kg/hm2, whi...An introduction and observation test was carried out to 8 tomato varieties in cement arch plastic greenhouse. The results showed that the tested variety 10-2 exhibited the highest average yield of 61 520.9 kg/hm2, which was higher than Mantian 2180 as control by 33.7%. Varieties 10-2 and 10-3 showed the advantages of good fruit type, uniform size, thick pericarp, good hardness, high fruit setting rate, strong disease resistance, good low temperature resistance, good tolerance to stor-age and transportation and good quality. They could be planted for demonstration as export varieties in open field and greenhouse in mountainous area in Ningxia.展开更多
文摘In a previous study by the authors,positive results from both a case-control study and a cohort study were reported.In the present study a short-term test for the induction of mouse lung tumor by chloroprene was conducted to confirm whether chloroprene monomer itself can induce tumors.Kunming albino mice weaned at 2 weeks were subjected to inhaling 0,2.9±0.3, 19.2±1.9,and 189.0±13.3 mg/m^3 chloroprene(GC purity,99.8%)4 h daily(except Sunday) for 7 months.All survivors were killed at the end of the 8th month or when moribund.No lung tumors were found before the 6th month.Thus,survivors at the 6th month were counted as effective animals.Most lung tumors observed were papilloadenomas(50/57),and a few were adenomas(7/57).The tumor incidence in the 2.9 mg/m^3 group was 8.1% in comparison to 1.3% in the control group,with the significance level at P<0.05.The higher the concentration,the higher the incidence.Examination of the multiplicity of tumor induction also demonstrated a dose-response relationship,and the number of tumors per mouse in the 189 mg/m^3 group was significant at P<0.01.1989 Academic Press,Inc.
文摘An introduction and observation test was carried out to 8 tomato varieties in cement arch plastic greenhouse. The results showed that the tested variety 10-2 exhibited the highest average yield of 61 520.9 kg/hm2, which was higher than Mantian 2180 as control by 33.7%. Varieties 10-2 and 10-3 showed the advantages of good fruit type, uniform size, thick pericarp, good hardness, high fruit setting rate, strong disease resistance, good low temperature resistance, good tolerance to stor-age and transportation and good quality. They could be planted for demonstration as export varieties in open field and greenhouse in mountainous area in Ningxia.
