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Ethylene Production by Isolated Chloroplasts E. F. Elstner and J. R. Konze Lehrstuhl für Biochemie der Pflanzen, Ruhr-Universität Bochum (Z. Naturforsch. 29 c, 710 — 716 [1974] ; received September 12, 1974) Ethylene Biosynthesis, Chloroplasts, Superoxide Free Radical Isolated chloroplast lamellae from spinach or sugar-beet leaves produce ethylene from methyl- mercaptopropanal (MMP) or 2-keto-4-methylmercaptobutyrate (KMB) in the light. The pH-opti- mum for ethylene production from MM P is 6.3; ethylene production from KMB has an apparent pH-optimum at about

Protein Transport in Chloroplasts: ATP is Prerequisit Christine Schindler, Ruth Hracky, and Jürgen Soll Botanisches Institut der Universität München, Menzinger Straße 67, D-8000 München 19, Bundesrepublik Deutschland Z. Naturforsch. 42c, 103 — 108 (1987); received August 26, 1986 Protein Transport, ATP-Hydrolysis, Chloroplasts, Envelope, Pisum sativum The energy requirem ent for protein transport into chloroplast was assayed under conditions that perm it to distinguish whether the posttranslational translocation is dependent on ATP or w hether a membrane

108 Notizen H eterogeneity in Chloroplasts of Siphonacious Algae as Compared with Higher Plant Chloroplasts Angela Liittke, U rsula R ahm sdorf, and R ainer Schmid Institut für Pflanzenphysiologie und Zellbiologie der Freien Universität Berlin (Z. Naturforsch. 31c, 108-110 [1976]; received September 29, 1975) Acetabularia Chloroplasts, Buoyant Densities, Isopycnic Gradient Centrifugation The chloroplast population of Acetabulana contains four subpopulations of intact plastids with the buoyant densities at 1.21 g/cm3 —1.18 g/cm3 —1.14 g/cm3 —1.10 g/cm3 on

Evidence for a Rapid Oxygen-Uptake in Tobacco Chloroplasts Georg H. Schmid and Pierre Thibault Centre d’Etudes Nueleaires de Cadarache, Department de Biologie, Service de Radioagronomie, B. P. n° 1, F-13115 Saint-Paul-lez-Durance, France Z. Naturforsch. 34 c, 414 — 418 (1979) ; received February 14, 1979 Chloroplasts, Oxygen uptake, Oscillations, Photosynthesis A fast oxygen uptake, induced by a sequence of short (5 /usee) saturating flashes was observed in chloroplasts of wild type tobacco and two chlorophyll-deficient tobacco mutants. One of the chlorophyll

Effect of Aging on the Fluorescence Lifetime of Chloroplasts S. S. Brody Department of Biology, Biophysics Laboratory, New York University, New York, N.Y., 10003, USA Z. Naturforsch. 37 c, 881-883 (1982); received January 4/May 24, 1982 Photosynthesis, Fluorescence Lifetimes, Aging, Sonicated Chloroplasts The lifetime of fluorescence from pea chloroplasts at room temperature increases with age. The ratio of the fluorescence intensities of the slow to fast decay components, decreases with age of the chloroplasts. This observation can account for the wide range

Enzymatic Synthesis of Quinolizidine Alkaloids in Lupin Chloroplasts M. Wink, T. Hartmann, Institut für Pharmazeutische Biologie der Technischen Universität Braunschweig, Pockelsstraße 4, D-3300 Braunschweig and L. Witte Gesellschaft für Biotechnologische Forschung, D-3300 Braunschweig-Stöckheim Z. Naturforsch. 35 c, 93-97 (1980); received September 26, 1979 Quinolizidine Alkaloids, Enzymatic Synthesis, Isolated Chloroplasts, Lupinus polyphyllus The enzymatic sequence responsible for the biosynthesis of tetracyclic quinolizidine alkaloids could be localized

Species-Specific Differences in Acetyl Coenzyme A Synthesis of Chloroplasts Hans-Jürgen Treede, Burgi Riens, and Klaus-Peter Heise Institut für Biochemie der Pflanze der Universität Göttingen. Untere Karspüle 2. D-3400 Göttingen, Bundesrepublik Deutschland Z. Naturforsch. 41c, 733-740 (1986); received March 21/April 17, 1986 Acetyl-CoA and Fatty Acid Synthesis, Chloroplasts The present investigation indicates that photosynthetically active chloroplasts can synthesize acetyl-CoA either from acetate via acetyl-CoA synthetase (ACS) or from pyruvate via the pyru

The Regulation of Acetyl Coenzyme A Synthesis in Chloroplasts Hans-Jürgen Treede and Klaus-Peter Heise Institut für Biochemie der Pflanze der Universität Göttingen, Untere Karspüle 2, D-3400 Göttin­ gen, Bundesrepublik Deutschland Z. Naturforsch. 40c, 496—502 (1985); received May 13, 1985 Pyruvate Dehydrogenase-Complex, Acetyl-CoA Synthetase, Chloroplasts The enzymatic activities of the pyruvate dehydrogenase complex (PDC) and acetyl-CoA synthe­ tase (ACS) have been compared in extracts of plastids isolated from spinach leaves and from both green and etiolated

Are Spinach Chloroplasts Involved in Flavonoid O-Methylation? Kim Thresh and Ragai K. Ibrahim Department of Biology, Concordia University, 1455 de Maisonneuve Blvd., West, Montreal, Quebec, Canada H3G 1M8 Z. Naturforsch. 40c, 331—335 (1985); received December 11, 1984/February 26, 1985 Spinacea oleracea, Chenopodiaceae, Chloroplasts, O-Methyltransferase, Caffeic Acid, Quercetin Intact spinach chloroplasts, which were isolated on a cushion of Percoll and purified on discon­ tinuous sucrose gradients, were found to adsorb appreciable amounts of high specific

ANTIBODIES TO CHLOROPHYLL 4 3 5 Antibodies to Chlorophyll and their Reactions with Chloroplast Preparations ALFONS R A D U N Z , GEORG H . SCHMID , and WILHELM MENKE Max-Planck-Institut für Züchtungsforschung (Erwin-Baur-Institut), Köln-Vogelsang (Z. Naturforsch. 26 b , 435--146 [1971] ; received March 4, 1971) Dedicated, to Prof. Dr. JOSEF STRAUB on the occasion of his 60th birthday Antibodies, Chlorophyll, Chloroplasts, Photosynthesis, Circular Dichroism. Antibodies to chlorophyll are specifically adsorbed onto the membrane surface of thylakoids. The