Published in Zeitschrift für Naturforschung C
The switch from embryonic to adult hemoglobin (Hb) has been studied in vivo by a correlated cytological and electrophoretic analysis of circulating red blood cells from early, purely embryonic-Hb stages to purely adult-Hb stages including the adult chicken. It has been discovered, by using an acid buffer treatment that selectively elutes adult but ...
Published in Zeitschrift für Naturforschung C
Phytotron grown plants of Glycine max var. Caloria infected with Rhizobium japonicum 61-A-101 under controlled conditions as 14 d old seedlings develop a sharp maximum of nitrogenase activity of 13 ± 3 nmol C2H4 · h-1 · mg nodule fresh weight-1 19 d after infection, followed by a long period of reduced activity (3 -5 nmol) between 30 and 45 days af...
Published in Zeitschrift für Naturforschung C
From the alcohol fraction of the epicuticular leaf wax of Hoya australis R. Br. ex Traill, a new triterpenol was isolated which, according to mass spectral and NMR data, is assumed to be A-seco-A-nor-⊿12-oleanenol.
Published in Zeitschrift für Naturforschung C
Infection of tobacco protoplasts with RNA of tobacco mosaic virus and the bromoviruses has been studied. The quality of the RNA was very important. Ribonuclease activity was controlled by incorporating 5 mᴍ ZnCl2 in the inoculum. Up to 60% infection has been observed with bromovirus RNA but infection with TMV RNA was much less efficient. A procedur...
Published in Zeitschrift für Naturforschung C
We describe the possibilities of formation and preparation of the “natural” 1,3-benzodioxolecarboxylic acids 1, 2, 4, 6 b, and 7, already mentioned in literature. Myristic acid (3e) was prepared in good yield from 3-methoxy-4,5-dihydroxy-benzoic acid ester (3c) , which could be easily made from 3-methoxy-2,3-carbonyldioxy-benzoic acid methylester (...
Published in Zeitschrift für Naturforschung C
The essential oil of chamomil roots has been investigated. Three sesquiterpenoids could be isolated and characterized by their retention time in reference to authentic substances and by their mass spectre. These are α-farnesene, β-farnesene and bisabololoxid A. Other sesquiterpenoids and polyentype substances are present and will be identified late...
Published in Zeitschrift für Naturforschung C
Nittrogen-fixing cells of Nostoc muscorum grown under nitrogen or in the presence of nitrate exhibit substantial light-induced hydrogen production for over 15 hours in the presence of electron transport inhibitors. Rates attain levels of 12 μmol H2 evolved/ml packed cell volume and hour. The ATP-dependent nitrogenase, not a hydrogenase, is responsi...
Published in Zeitschrift für Naturforschung C
When various cations, including Ca2+, are in the fixative, both sarcoplasmic reticulum (SR) of whole skeletal muscle and isolated SR vesicles collapse to form pentalaminate “compound membranes” that result from the apparent fusion of the lumenal lamellae of the membranous envelope of the SR. The process may be reversed by subsequently soaking the t...
Published in Zeitschrift für Naturforschung C
In chromatic adapted barnacle median and lateral photoreceptors the two stable states of the photopigment (rhodopsin R and metarhodopsin M) were interconverted with intense, colored light flashes of 1 ms duration. Only after conversion of the red adapted photoreceptor in K+-Ringer solution with an intense flash the negative early receptor potentia...
Published in Zeitschrift für Naturforschung C
1,2,5-Trihydroxy-3-methylanthraquinone (4), 2-hydroxy-3-(hydroxymethyl)-anthraquinone (2) and three dihydroxymonomethyl-anthraquinones (5, 6, 7) have been synthesized. 2 and 4 are new synthetic compounds.
