ZfN: Search Results

1	Author	Gabriele Knörzer, Herm Ann Seyffer, W. Alter, Siebert	Requires cookie*
	Title	Synthese von Diboraheterocyclen mit einer BC3B-Gruppierung Synthesis of Diboraheterocycles with a BC3B Unit
	Reference	Z. Naturforsch. 45b, 1136—1138 (1990); eingegangen am 31. Januar 1990
	Published	1990
	Keywords	1, 3-Diborylpropanes, 1, 2-Diborolane, 1, 2, 6-Thiadiborinane, 1, 2, 6-Azadiborinane
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	TEI-XML for	default:Reihe_B/45/ZNB-1990-45b-1136.pdf
	Identifier	ZNB-1990-45b-1136
	Volume	45

2	Author	M. Arianne Bäudler, JosefH. Ahn	Requires cookie*
	Title	Zur Existenz eines Triphosphacyclobutenid-Ions P3CH20 Contributions to the Chemistry of Phosphorus, 204 [1] On the Existence of a Triphosphacyclobutenide Ion P3C H 2e
	Abstract	The structure o f the reaction product o f white phosphorus and sodium in diglyme which exhibits a low field AB2 system in the 31P {'H } N M R spectrum [4] has been reexamined. A c cording to the results o f a complete analysis o f its proton coupled 31P N M R spectrum (ABB'XX' system), the compound is the hitherto unknown 1,2,3-triphosphacyclopentadienide
	Reference	Z. Naturforsch. 45b, 1139—1142 (1990); eingegangen am 9. Februar 1990
	Published	1990
	Keywords	Triphosphacyclobutenide Ion, 1, 2, 3-Triphosphacyclopentadienide Ion, Tetraphosphacyclopentadienide Ion, Phosphorus Heterocycles
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	TEI-XML for	default:Reihe_B/45/ZNB-1990-45b-1139.pdf
	Identifier	ZNB-1990-45b-1139
	Volume	45

3	Author	Z. Naturforsch	Requires cookie*
	Title	Filippo Imperato
	Abstract	A new pentaoxigenated xanthone has been iso lated from aerial parts o f the fern Cystopteris fra gilis. By spectroscopic and chemical methods this compound has been shown to be 1,6-dihydroxy-3,5,7-trimethoxyxanthone which is o f biosynthetic interest in ferns.
	Reference	Z. Naturforsch. 45b, 1603—1604 (1990); received June 1 1990
	Published	1990
	Keywords	Cystopteris fragilis, Pteridophyta, Aspleniaceae, 1, 6-Dihydroxy-3, 5, 7-trimethoxyxanthone
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	TEI-XML for	default:Reihe_B/45/ZNB-1990-45b-1603_n.pdf
	Identifier	ZNB-1990-45b-1603_n
	Volume	45

4	Author	Virginia Massheimer, LuisM. Fernandez, AnaR. De Boland	Requires cookie*
	Title	Stimulation of Calmodulin Binding to Skeletal Muscle Membrane Proteins by 1,25-Dihydroxy-Vitamin D 3
	Abstract	Previous work has shown that 1,25-dihydroxy-vitamin D 3 rapidly increases calmodulin lev els of skeletal muscle membranes without altering the muscle cell calmodulin content. There fore, the effects of the sterol on the binding of calmodulin to specific muscle membrane pro teins were investigated. Soleus muscles from vitamin D-deficient chicks were treated in vitro for short intervals (5-15 min) with physiological concentrations of 1,25-dihydroxy-vitamin D 3. Proteins of mitochondria and microsomes isolated by differential centrifugation were sep arated on sodium dodecyl sulfate polyacrylamide gels. Calmodulin-binding proteins were identified by a [125I]calmodulin gel overlay procedure followed by autoradiography. 1,25-Di-hydroxy-vitamin D 3 increased the binding of labelled calmodulin to a major, calcium-inde pendent, calmodulin-binding protein of 28 Kda localized in microsomes, and to minor calmo dulin-binding proteins of 78 and 130 Kda proteins localized in mitochondria. The binding of [125I]calmodulin to these proteins was abolished by flufenazine or excess non-radioactive cal modulin. 1,25-Dihydroxy-vitamin D 3 rapidly increased muscle tissue Ca uptake and cyclic AM P levels and stimulated the phosphorylation of several membrane proteins including those whose calmodulin-binding capacity potentiates. Analogously to the sterol, forskolin increased membrane calmodulin content, calmodulin binding to the 28 Kda microsomal protein and 45Ca uptake by soleus muscle preparations. Forskolin also induced a similar profile of changes in muscle membrane protein phosphorylation as the hormone. These results suggest that 1,25-dihydroxy-vitamin D 3 affects calmodulin distribution in muscle cells through cyclic AMP-de-pendent phosphorylation of membrane calmodulin-binding proteins. These changes may play a role in the stimulation of muscle Ca uptake by the sterol.
	Reference	Z. Naturforsch. 45c, 663—670 (1990); received October 2/November 3 1989
	Published	1990
	Keywords	1, 25-Dihydroxy-Vitamin D 3, Skeletal Muscle, Muscle Membranes, Calmodulin Binding, Protein Phosphorylation
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	TEI-XML for	default:Reihe_C/45/ZNC-1990-45c-0663.pdf
	Identifier	ZNC-1990-45c-0663
	Volume	45