In this study, we determined the granite ages in the middle to east Gangdese batholith. Zircon ages from these granites are 57.6-68.7 Ma, indicating that intrusions were formed in the Late Cretaceous to early Paleocen...In this study, we determined the granite ages in the middle to east Gangdese batholith. Zircon ages from these granites are 57.6-68.7 Ma, indicating that intrusions were formed in the Late Cretaceous to early Paleocene. The large-ion lithophile elements are highly enriched, whereas some high-field-strength elements are depleted. The Sr-Nd-Pb isotopic characteristics are similar to those of the Dianzhong volcanics in the Linzhou Basin, indicating the same origin and tectonic environment. The samples show positive εHf(t) values that are slightly lower than the values for the Linzizong volcanics, the Quxu intrusion, and other intrusions in middle Gangdese. We conclude that our samples, the Linzizong volcanics, and most main-collisional intrusions are derived from the same source with different ratios of crust and mantle input. On the basis of geological, geochemical, geochronological, and isotopic information, we conclude that the Late Cretaceous to Paleogene evolution of Gangdese can be divided into three stages. First, the collision began at 70-60 Ma, the same time as rollback of the Tethys Ocean slab. Second, during 60-50 Ma, slab breakoff triggered upwelling of the asthenosphere. Third, after 50 Ma, the Tethys Ocean slab's effect disappeared and the interaction between Indian and Asian crusts began influencing magmatism in Gangdese.展开更多
目的观察腺苷预处理对大鼠脑缺血再灌注后基质金属蛋白酶9(MMP-9)和闭锁连接蛋白1(ZO-1)表达变化的影响。方法108只健康雄性SD大鼠随机分为对照组、模型组、腺苷组(n=36)。造模前腺苷组腹腔注射腺苷注射液,对照组和模型组大鼠在相同时...目的观察腺苷预处理对大鼠脑缺血再灌注后基质金属蛋白酶9(MMP-9)和闭锁连接蛋白1(ZO-1)表达变化的影响。方法108只健康雄性SD大鼠随机分为对照组、模型组、腺苷组(n=36)。造模前腺苷组腹腔注射腺苷注射液,对照组和模型组大鼠在相同时间点腹腔注射2 ml生理盐水。采用改良的线栓法栓塞右侧大脑中动脉阻断血流2 h后,将线拔出形成再灌注。再灌注24 h后,伊文思蓝(EB)渗透法测定血脑屏障通透性,检测MMP-9和ZO-1表达。结果模型组和腺苷组EB,脑含水量,MMP-9明显高于对照组,ZO-1明显低于对照组(P<0.01);模型组和腺苷组MMP-9/β肌动蛋白(β-actin)表达明显高于对照组(0.563±0.054和0.377±0.080 vs 0.242±0.021,P<0.01),ZO-1/β-actin表达明显低于对照组(0.186±0.042和0.393±0.075 vs 0.671±0.065,P<0.01)。腺苷组MMP-9/β-actin表达低于模型组,ZO-1/β-actin表达明显高于模型组(P<0.01)。结论腺苷预处理可以通过抑制MMP-9表达,增加ZO-1表达,改善血脑屏障完整性,减轻脑水肿与脑缺血再灌注后的神经损伤。展开更多
Aphidius gifuensis Ashmead is an economically important aphid parasitoid,particularly for pest Myzus persicae.The aim of the study was to feed M.persicae using a formulated artificial medium instead of tobacco to main...Aphidius gifuensis Ashmead is an economically important aphid parasitoid,particularly for pest Myzus persicae.The aim of the study was to feed M.persicae using a formulated artificial medium instead of tobacco to maintain parasitoid A.gifuensis in winter.The development,survival and reproduction of M.persicae fed with four artificial media(AM1-AM4),as well as the parasitism,emergence and longevity of A.gifuensis when reared on F3 M.persicae fed with AMI,were assessed.Over 15 days of the study,the survival rates of A.gifuensis for the AM1 and AM2 treatments were significantly greater than those for the AM3 and AM4 treatments.The highest fecundity of F,A.gifuensis females was observed on AM1 feeding.No differences were noted in survival rate,development or nymph production between F:and F,M.persicae fed with AM1.No differences were recorded in the number of mummies,parasitism rate,adult Iongevity or proportion of A.gifuensis females between Treatment I(4.gifuensis parasitizing AM1-reared M.persicae)and the control.However,the emergence rate of Treatment I was lower than that of the control.The rearing of.A.gifuensis on M.persicae fed with an artificial medium was found to be a feasible proposition.This could save time,space and cost compared with traditional production methods.展开更多
The day June 23,2021 bore witness to the inauguration of the Research Center for the History of Science and Technology(RCHST) of Nankai University(NKU) and the signing ceremony of a cooperation agreement between the I...The day June 23,2021 bore witness to the inauguration of the Research Center for the History of Science and Technology(RCHST) of Nankai University(NKU) and the signing ceremony of a cooperation agreement between the Institute for the History of Natural Sciences(IHNS) of the Chinese Academy of Sciences and NKU in Tianjin(Figure 1).展开更多
文摘In this study, we determined the granite ages in the middle to east Gangdese batholith. Zircon ages from these granites are 57.6-68.7 Ma, indicating that intrusions were formed in the Late Cretaceous to early Paleocene. The large-ion lithophile elements are highly enriched, whereas some high-field-strength elements are depleted. The Sr-Nd-Pb isotopic characteristics are similar to those of the Dianzhong volcanics in the Linzhou Basin, indicating the same origin and tectonic environment. The samples show positive εHf(t) values that are slightly lower than the values for the Linzizong volcanics, the Quxu intrusion, and other intrusions in middle Gangdese. We conclude that our samples, the Linzizong volcanics, and most main-collisional intrusions are derived from the same source with different ratios of crust and mantle input. On the basis of geological, geochemical, geochronological, and isotopic information, we conclude that the Late Cretaceous to Paleogene evolution of Gangdese can be divided into three stages. First, the collision began at 70-60 Ma, the same time as rollback of the Tethys Ocean slab. Second, during 60-50 Ma, slab breakoff triggered upwelling of the asthenosphere. Third, after 50 Ma, the Tethys Ocean slab's effect disappeared and the interaction between Indian and Asian crusts began influencing magmatism in Gangdese.
文摘目的观察腺苷预处理对大鼠脑缺血再灌注后基质金属蛋白酶9(MMP-9)和闭锁连接蛋白1(ZO-1)表达变化的影响。方法108只健康雄性SD大鼠随机分为对照组、模型组、腺苷组(n=36)。造模前腺苷组腹腔注射腺苷注射液,对照组和模型组大鼠在相同时间点腹腔注射2 ml生理盐水。采用改良的线栓法栓塞右侧大脑中动脉阻断血流2 h后,将线拔出形成再灌注。再灌注24 h后,伊文思蓝(EB)渗透法测定血脑屏障通透性,检测MMP-9和ZO-1表达。结果模型组和腺苷组EB,脑含水量,MMP-9明显高于对照组,ZO-1明显低于对照组(P<0.01);模型组和腺苷组MMP-9/β肌动蛋白(β-actin)表达明显高于对照组(0.563±0.054和0.377±0.080 vs 0.242±0.021,P<0.01),ZO-1/β-actin表达明显低于对照组(0.186±0.042和0.393±0.075 vs 0.671±0.065,P<0.01)。腺苷组MMP-9/β-actin表达低于模型组,ZO-1/β-actin表达明显高于模型组(P<0.01)。结论腺苷预处理可以通过抑制MMP-9表达,增加ZO-1表达,改善血脑屏障完整性,减轻脑水肿与脑缺血再灌注后的神经损伤。
文摘Aphidius gifuensis Ashmead is an economically important aphid parasitoid,particularly for pest Myzus persicae.The aim of the study was to feed M.persicae using a formulated artificial medium instead of tobacco to maintain parasitoid A.gifuensis in winter.The development,survival and reproduction of M.persicae fed with four artificial media(AM1-AM4),as well as the parasitism,emergence and longevity of A.gifuensis when reared on F3 M.persicae fed with AMI,were assessed.Over 15 days of the study,the survival rates of A.gifuensis for the AM1 and AM2 treatments were significantly greater than those for the AM3 and AM4 treatments.The highest fecundity of F,A.gifuensis females was observed on AM1 feeding.No differences were noted in survival rate,development or nymph production between F:and F,M.persicae fed with AM1.No differences were recorded in the number of mummies,parasitism rate,adult Iongevity or proportion of A.gifuensis females between Treatment I(4.gifuensis parasitizing AM1-reared M.persicae)and the control.However,the emergence rate of Treatment I was lower than that of the control.The rearing of.A.gifuensis on M.persicae fed with an artificial medium was found to be a feasible proposition.This could save time,space and cost compared with traditional production methods.
文摘The day June 23,2021 bore witness to the inauguration of the Research Center for the History of Science and Technology(RCHST) of Nankai University(NKU) and the signing ceremony of a cooperation agreement between the Institute for the History of Natural Sciences(IHNS) of the Chinese Academy of Sciences and NKU in Tianjin(Figure 1).