Dissertation Enhancement: Regulation of N2 Fixation in Trichodesmium

小行星9602462 该奖项为东海大学海洋科学与技术学院的道格拉斯卡彭提供了为期3个月的国家科学基金会论文增强奖。 Capone博士的学生Margaret Mulholland女士将与海洋科学与技术学院教授Kaori Ohki博士合作开展一项名为“Trichodesmium中N2固定的调节”的研究项目。 束毛藻属是N2固定，海洋蓝藻，出现在整个热带和亚热带海洋的地区，否则注意到他们缺乏植物生命。 对于许多陆地系统，海洋植物生产的限制主要归因于可利用的氮化合物的短缺。 束毛藻属，利用氮的最丰富形式二氮气体，从而减轻氮限制并向这些系统提供新的氮输入。束毛藻属可以维持高速率的N2固定在自然界中，然而，很少有人知道的生化和生理条件，支持N2固定在这些物种，因为他们一直难以维持在受控的培养系统。 Ohki教授和她的合作者已经成功地尝试在培养物中培养Trichodesmium，但将这种培养物转移到其他实验室已被证明是不成功的。 本项目将研究在有和没有固定氮化合物的受控条件下生长的束毛藻NIBB1067的氮代谢和N2固定的细胞调节。 这些研究的结果将与实地结果进行比较，以便更好地了解束毛藻的自然种群。 ***

9602462 Capone This award provides support for a 3 month National Science Foundation Dissertation Enhancement Award for Douglas Capone at Tokai University, School of Marine Science and Technology. Dr. Capone's student, Ms. Margaret Mulholland will work with Dr. Kaori Ohki, Professor in the School of Marine Science and Technology, on a research project entitled, "Regulation of N2 fixation in Trichodesmium". Trichodesmium spp. are N2 fixing, marine cyanobacteria that occur throughout the tropical and subtropical oceans in areas otherwise noted for their paucity of plant life. As for many terrestrial systems, limitation of oceanic plant production is attributed primarily to a shortage of utilizable nitrogen compounds. Trichodesmium spp., utilize dinitrogen gas, the most abundant form of nitrogen, thereby alleviating nitrogen limitation and providing new nitrogen input into these systems. Trichodesmium spp. can sustain high rates of N2 fixation in nature; however, little is known about the biochemical and physiological conditions that support N2 fixation in these species since they have been difficult to maintain in controlled culture systems. Professor Ohki and her collaborators have been successful in their attempts to grow Trichodesmium in cultures,but transfer of this culture to other laboratories has proven unsuccessful. This project will examine the cellular regulation of N metabolism and N2 fixation in Trichodesmium NIBB1067 grown under controlled conditions with and without fixed nitrogen compounds. Results from these studies will be compared with results from the field in order to better understand the natural populations of Trichodesmium. ***