首页 | 本学科首页   官方微博 | 高级检索  
     检索      


On the red coloration of saltern crystallizer ponds. II. Additional evidence for the contribution of halobacterial pigments
Authors:Aharon Oren  Zvy Dubinsky
Institution:(1) Division of Microbial and Molecular Ecology, The Alexander Silberman Institute of Life Sciences, and The Moshe Shilo Center for Marine Biogeochemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel;(2) Life Sciences Department, Bar-Ilan University, 52900 Ramat Gan, Israel
Abstract:In a previous paper we attempted to assess the contribution of red bacteria of theHalobacterium — Haloferax — Haloarcula group and of the beta-carotene-rich green algaDunaliella salina to the red colour of saltern crystallizer ponds. By means of light absorption measurements, we showed that bacterioruberin contained in the bacteria was mainly responsible for the colour of the brines, in spite of the fact that beta-carotene derived fromDunaliella was the pigment present in the greatest amount. This apparent discrepancy was explained by the very smallin vivo optical cross-section of beta-carotene, which is densely packed in globules inside theD. salina cells. We recently observed that the centrifugation technique used in the previous study to collect biomass from the ponds was unsuitable for this type of measurements, as a substantial part of theDunaliella cells present did not sediment upon centrifugation due to the low specific gravity caused by the high beta-carotene content. Therefore similar measurements were performed with biomass collected by filtration. Again,in vivo absorption spectra were dominated by the absorption peaks of bacterioruberin. The results reported here show that, in spite of the methodological problem associated with the earlier study, all views and conclusions expressed in our earlier paper retain their validity.
Keywords:solar salterns  Halobacterium  Dunaliella  bacterioruberin  beta-carotene" target="_blank">gif" alt="beta" align="MIDDLE" BORDER="0">-carotene
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号