本次講座將由黃邦欽老師邀請的Edward Laws教授主講，詳情如下，歡迎有興趣的老師同學前來參加：

主題：午餐交流會第六十講：Nutrient-limited growth of marine phytoplankton: Monod or not?

主講人：Prof. Edward Laws,  School of the Coast & Environment, Department of Environmental Sciences, Louisiana State University

時間：2016年7月18日，11:40-13:30 （12:20開始講座）

地點：周隆泉樓A3-206

Abstract

For many years the concentrations of inorganic nitrogen and phosphorus that limit the growth of marine phytoplankton were below the limit of detection by traditional colorimetric methods of analysis. In the case of nitrate, that situation changed dramatically with the development of the chemiluminescent assay for nitrate. Concentrations of nitrate measured with this technique in the surface waters of some parts of the open ocean have been found to be consistently less than 5 nM. Although analysis of phosphate is still based on colorimetric methods, the availability of a convenient radioactive tracer, either ³²P or ³³P, has made it possible to determine the relationship between phosphate concentrations and growth rates of laboratory cultures and to test the accuracy of the presumed hyperbolic relationship (Monod equation) between growth rate and substrate concentration. Similar studies in the case of ammonium-limited growth continue to be problematic because there is no convenient radioactive tracer for nitrogen and there is no assay for ammonium analogous to the chemiluminescent assay for nitrate. All available evidence indicates that limiting inorganic nitrogen and phosphate concentrations in the ocean are on the order of nanomolar to perhaps a few hundred nanomolar.

 

本次午餐會將為報名參加的師生提供午餐，所有午餐會的報名都通過網絡進行。請老師同學們訪問MEL網頁（http://mel.xmu.edu.cn/lecture.asp?id=1），在本次午餐會的“報名”一欄填寫并提交。
本講座將發布當天僅開放給科研人員、技術人員、博士后、訪問學者等教師優先報名，第二天起開放給全體師生報名。學生應在規定時間內報名，如提前以教師的名義報名，將導致報名無效。
本周五下午4點為截止報名時間，總報名人數限制在100名以內。如未及時報上名，可于12:20直接到場聽報告。如已報名但因事不能參加，也請在周五下午4點前告知。
午餐會一如既往地歡迎大家的關注，如有興趣做講座的老師。歡迎與我們聯系。