The abundances of nearly 40 elements, Ir included, have been measured using radio-chemical and instrumental neutron activation analysis (RNAA and INAA) across a Devonian/Carboniferous (D/C) boundary section at Huangma...The abundances of nearly 40 elements, Ir included, have been measured using radio-chemical and instrumental neutron activation analysis (RNAA and INAA) across a Devonian/Carboniferous (D/C) boundary section at Huangmao, Guangxi, China. The Ir anomaly has been found in the D/C boundary bed. Its peak value is 156 ppt, richer by a factor of 12 than that in the underlying strata. Besides, as with Ir, other siderophile and chalcophile elements such as Au. Ni. Co. As and Sb are also enriched. The cause for the abundance anomalies of Ir and other elemets is discussed. Neither volcanic eruption nor extraterrestrial impact can explain it satisfactorily. The real mechanism for the anomalies awaits further study.展开更多
为研究黄茅海常见经济物种的热耐受性,采用动态实验法和静态实验法,研究了褐篮子鱼、褐菖鲉、褐石斑鱼、口虾蛄和日本蟳在不同基础水温(即驯化温度,14.0、18.0、24.0和30.8°C)和温升速率(0.5、1.0、2.0、3.0、4.0、6.0、9.0、12.0...为研究黄茅海常见经济物种的热耐受性,采用动态实验法和静态实验法,研究了褐篮子鱼、褐菖鲉、褐石斑鱼、口虾蛄和日本蟳在不同基础水温(即驯化温度,14.0、18.0、24.0和30.8°C)和温升速率(0.5、1.0、2.0、3.0、4.0、6.0、9.0、12.0和15.0°C/h)条件下的热耐受能力[最大临界温度(CTM)和24 h高起始致死温度(24 h UILT50)]。动态实验结果表明,基础水温和温升速率显著影响实验动物的热耐受能力,即实验动物的耐热性与基础水温呈正相关。温升速率对其热耐受性的影响受基础水温的制约:在4个基础水温条件下,随着温升速率的升高,实验动物的CTM总体呈上升趋势。静态实验结果表明,实验动物的24 h UILT50受物种差异和基础水温的影响显著。随着基础水温从14.0°C升高至30.8°C,褐篮子鱼、褐菖鲉、褐石斑鱼、口虾蛄和日本蟳的24 h UILT50分别从28.1、28.9、30.3、28.4和36.3°C显著上升至34.6、36.1、36.6、35.1和38.2°C。动态实验法和静态实验法分析发现,5种实验动物的热耐受能力依次为日本蟳>褐石斑鱼>褐菖鲉>口虾蛄>褐篮子鱼。展开更多
文摘The abundances of nearly 40 elements, Ir included, have been measured using radio-chemical and instrumental neutron activation analysis (RNAA and INAA) across a Devonian/Carboniferous (D/C) boundary section at Huangmao, Guangxi, China. The Ir anomaly has been found in the D/C boundary bed. Its peak value is 156 ppt, richer by a factor of 12 than that in the underlying strata. Besides, as with Ir, other siderophile and chalcophile elements such as Au. Ni. Co. As and Sb are also enriched. The cause for the abundance anomalies of Ir and other elemets is discussed. Neither volcanic eruption nor extraterrestrial impact can explain it satisfactorily. The real mechanism for the anomalies awaits further study.
文摘为研究黄茅海常见经济物种的热耐受性,采用动态实验法和静态实验法,研究了褐篮子鱼、褐菖鲉、褐石斑鱼、口虾蛄和日本蟳在不同基础水温(即驯化温度,14.0、18.0、24.0和30.8°C)和温升速率(0.5、1.0、2.0、3.0、4.0、6.0、9.0、12.0和15.0°C/h)条件下的热耐受能力[最大临界温度(CTM)和24 h高起始致死温度(24 h UILT50)]。动态实验结果表明,基础水温和温升速率显著影响实验动物的热耐受能力,即实验动物的耐热性与基础水温呈正相关。温升速率对其热耐受性的影响受基础水温的制约:在4个基础水温条件下,随着温升速率的升高,实验动物的CTM总体呈上升趋势。静态实验结果表明,实验动物的24 h UILT50受物种差异和基础水温的影响显著。随着基础水温从14.0°C升高至30.8°C,褐篮子鱼、褐菖鲉、褐石斑鱼、口虾蛄和日本蟳的24 h UILT50分别从28.1、28.9、30.3、28.4和36.3°C显著上升至34.6、36.1、36.6、35.1和38.2°C。动态实验法和静态实验法分析发现,5种实验动物的热耐受能力依次为日本蟳>褐石斑鱼>褐菖鲉>口虾蛄>褐篮子鱼。