Country of Origin: United States. Country of Publication: United States Document Type: REP0RT Most documents avai1ab1e from AIAA Technica1 Library Other Avai1abi1ity: NTIS MC A02/MFA 01 Journa1 Announcement: STAR8515 The composition, structure and properties of reaction centers from Rhodcpseudomonas viridis were examined. Four distinct polypeptides were found, one of which contains heme groups. Linear dichroism showed the 2 hemes have different orientations in the reaction center. In this bacterium containing BCh 1 b, not a, circular dichroism indicated the absence of strong excitonic coupling between the 2 BCh1 b's in the antenna complex. Isolated chr omatophor es ar e unusua 1 i n not havi ng any detec t ab 1 e ATPase. The intrinsic portion, F/sub □/, is also missing. Equipment improvements inc1uded insta11ation of a computer, interfacing with data acquisition systems, and development of programs for rapid analysis of data on absorpt i on, linear or circu1ar diehroism, and fluorescence. The dichroism spectromet er w a s rebui11 to measure absdrbance, 1inear or circu1ar dichroism in modu1ated light; and the dual wavelengths spectrometer was updated to greater sensitivity and resolution. A system to combine f1uorescence measurements with absorbsancy of quinone redox changes was developed, and used to estimate the proportion of alpha and beta, centers in a given PS I I popu1ation. (D 0 E) Source of Abstract (Subfile): DOE Keywords: *ALGAE; *BACTERIA; *CHEMICAL COMPOSITION; *ENER8Y CONVERSION ; *MOLECULAR STRUCTURE; *PHOTOSYNTHESIS; CHLOROPHYLLS; DICHROISM; FLUORESCENCE; OXI DAT ION-REDUCT I ON REACT IONS; PIGMENTS; POLYPEPT I DES Subject Classification: 7544 Energy Production & Conversion (1975 -) The radiation situation in space and its modification by geomagnetic field and shielding. HEINRICH, W. ; BEER, J. (Siegen, UniversitaetG esamt hochsch u1e, Siegen, West German y) (C0SPAR, Top ical Meet ing on Li f e Sc iences and Space Research XXI(l) , Graz, Austria, June 25-July 7, 1984) Advances in Space Research (ISSN 0273-1177), vol. 4, no. 10, 1984, p. 133-142. Sponsorship: Bundesministerium fuer Forschung und techno1ogie. 22 Refs. Contract No.: BMFT-01-QV-3127; BMFT-01-QV-2032; BMFT.01-QV-3029; BMFT-01-QV-2130 Lan guage: Eng1ish. Cou n t ry of Ori gin: German y, Federa1 Republie of. Country of Pub1i cat i on: United Kingdom Document. Type: JOURNAL ARTICLE Most documents available from AIAA Technical Library Journa1 Announeement: IAA 8515 The fluxes of the nuclear component of the galactic cosmic radiation are discussed in terms of energy spectra for the different elements. Influences of shielding by the earth's magnetic fie1d on these spectra are described. Energy spectra behind the absorbing ma11er are calculated
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