+ Visit NASA.gov + Contact NASA   + Home Select Search Field * All Report - Patent Number Abstract *Accession Number *NASA Center *Author NameDocument IDKeywordsPublication Date *Title * Find Results With All of the words At least one of the words Enter Search Term  within returned results    Search Tips: Use only the fields with * to search NIX collection. Enclose terms in double quotation marks (") to search for exact phrases, ie: "space shuttle". NOTE: Commas and dashes are removed from search term by search engine. Select Reset Search button to start a new search. See Help for more tips. + Publication Year – Availability Options  + Order From CASI  + Order From Other Sources + Item/Media Type Selected Navigations: Author > Lewin, R. A. [x] Sort results by: NASA Center | Date Added to NTRS | Publication Year There are a total of 12 record(s) matching your query. Sorted by: Date Added To NTRS in Descending order 1 2 Next  Prochloron--a status report Author(s): Lewin, R. A. Abstract: Prochloron is a genus of prokaryotic algae with photosynthetic pigments like those of chlorophytes. Prochlorophytes are almost invariably found associated as symbionts with marine protochordates (didemnid ascidians), and so ... NASA Center: NASA (non Center Specific) Publication Year: 1984 Added to NTRS: 2006-08-02 Document ID: 20040120369 Diurnal rhythm in the cell-division frequency of prochloron (prochlorophyta) in nature Author(s): Lewin, R. A.; Cheng, L.; Matta, J. Abstract: Frequencies of cell division stages in suspensions of Prochloron cells, expressed at regular intervals throughout a natural day-night cycle from several colonies of four species of host didemnid, are given. The proportion of ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20118; Document ID: 19840012050 Report of prochloron research, IPE-7 (Palau, February 1982) Author(s): Lewin, R. A.; Cheng, L. Abstract: Various aspects of Prochloron research are discussed. At suitable low-tide periods about 5-6 new sites were surveyed as possible convenient sources of symbiotic didemnids. The Kanori Channel site peviously surveyed during ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20122; Document ID: 19840012054 Prochloron-ascidian symbioses: Photosynthetic potential and productivity Author(s): Lewin, R. A.; Cheng, L.; Alberte, R. S. Abstract: The chlorophyll content of didemnid asidians with symbiotic algae (Prochloron) from oligotropic tropical marine waters around Palau, Western Carolin Islands is discussed. Several species contain as much chlorophyll per unit ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20117; Document ID: 19840012049 The problems of Prochloron Author(s): Lewin, R. A. Abstract: Prokaryotic green algae (prochlorophytes), which contain chlorophylls a and b but no bilin pigments, may be phylogenetically related to ancestral chloroplasts if symbiogenesis occurred. They may be otherwise related to ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84A31801; Document ID: 19840049014 The Prochloron symbiosis Author(s): Pardy, R. L.; Lee, K.; Lewin, R. A. Abstract: Colonies of L. patella were collected from inshore water adjacent to small islets near Babelthaup Island, Republic of Palau, for the purpose of studying Prochloron symbionts. Examination of the algal symbionts after fixing, ... NASA Center: NASA (non Center Specific) Publication Year: 1984 Added to NTRS: 2004-11-03 Accession Number: 84A29700; Document ID: 19840046913 The disposition of DNA in Prochloron (Prochlorophyta) Author(s): Coleman, A. W.; Lewin, R. A. Abstract: The discovery of both chlorophyll a and b in the prokaryote Prochloron Lewin, a trait otherwise unique to eukaryotic photosynthetic organisms, has stimulated speculation on the possible endosymbiont origins of the plastids ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84A31612; Document ID: 19840048825 Prochloron on synaptula Author(s): Cheng, L.; Lewin, R. A. Abstract: It is reported that, for the first time, Prochloron cells were found associated with an animal other than a colonial ascidian-namely, a synaptid holothurian, Snaptula lamperti. This occurance brings into question the ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20114; Document ID: 19840012046 Chlorophyll and carotenoid pigments of prochloron (prochlorophyta) Author(s): Paerl, H. W.; Lewin, R. A.; Cheng, L. Abstract: High-performance liquid chromatography (HPLC) with a gradient-elution technique was utilized to separate and quantify chlorophylls a and b as well as major carotenoid pigments present in freeze-dried preprations of ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20119; Document ID: 19840012051 Prochloron Author(s): Lewin, R. A. Abstract: A review is given of the research problems associated with Prochloron. Two questions are discussed in detail. Did prochlorophytes arise in independently off cyanophytes, or did one of these classes arise from the other If ... NASA Center: NASA (non Center Specific) Publication Year: 1983 Added to NTRS: 2004-11-03 Accession Number: 84N20116; Document ID: 19840012048 1 2 Next  + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007