Showing papers in "Phytochemistry in 1968"

TL;DR: In this article, the authors discuss unsaturated isomeric hydrocarbons of Botryococcus brauniis growing in natural environment, discussing unsaturated polygonal polycyclic linear chains.

TL;DR: The effectiveness, usefulness and limitations of thiols and other reducing agents for preventing inactivation of enzymes and subcellular organelles during extraction are reviewed.

TL;DR: In this paper, the phenolic content of oak Quercus robur L. leaves was investigated by paper chromatography throughout the growing season, and the condensed and hydrolysable tannins from crude tannin, prepared by salting-out aqueous acetone extracts of mature leaves were separated by chromatography on Sephadex columns.

TL;DR: The location of the double bonds in the unsaturated compounds was determined by a novel method involving hydroxylation followed by GC-MS of the trimethylsilyl ethers of the resulting vic -dihydroxy compounds.

TL;DR: The maximum bonding of the principal plant phenols ofNicotiana tabacum to insoluble polyvinylpyrrolidone occurred at pH 3·5 in 1−10 per cent methanol as discussed by the authors.

TL;DR: Although linoleic acid was the predominant fatty acid in most acyl lipids, esterified steryl glucoside, phosph atidylinositol and phosphatidylglycerol were relatively richer in palmitic acid.

TL;DR: The results, which suggests a selective degradation of plastid membranes during ripening, are discussed in relation to current theories of fruit ripening.

TL;DR: In this article, an aryl acylamidase (aryl-acylamine amidohydrolase, EC 3.5.1) from rice, which hydrolyzes 3,4-dichloropropionanilide, has been partially purified and characterized.

TL;DR: No HCN could be detected in seeds of one cultivar of Manihot utilissima Pohl whereas seeds of two other cultivars contained 5·2–8·5 μg HCN/g fresh weight, however, 10–14-day-old seedlings of all three cultivars contain 156–260 μg HCNs, indicating a rapid biosynthesis of cyanogenic material occurred during germination.

TL;DR: An improved method for the synthesis of dl -α-acetamino-β-methylaminopropionic acid and the use of this compound for the Synthetic l -isomer failed to produce toxic effects when injected in comparable amounts into chicks and young rats.

TL;DR: Of a group of structurally and metabolically related monoterpenes, the ones most toxic toward radish seeds were those having a ketone functional group, camphor and pulegone, which stimulated germination at low concentrations and inhibited it at increasing concentrations.

TL;DR: The rapid translocation of nitrogen from the reserve proteins in the cotyledons to the growing axis appears to involve the degradation of proteins to amino acids, which is essential for the growth of peas.

TL;DR: Analysis of non-aqueous fractions of leaves indicates that carbonic anhydrase is a cytoplasmic enzyme in plants with C 4 -dicarboxylic acid pathway, whereas in plantsWith only the Calvin cycle the enzyme is located in the chloroplasts.

TL;DR: The composition of the polyphenolic extractives of unattacked, damaged and Sirex-affected sapwood, heartwood, and knotwood of Pinus radiata D Don differ considerably as mentioned in this paper.

TL;DR: It is shown that the richest variation in pigment structures occurs in the genus Primula, and the rare 7- O -methylated anthocyanin hirsutin is confined to this genus and occurs in all subgenera except Auganthus, where it is replaced by malvin or malvidin 3-glucoside as the principal petal pigment.

TL;DR: In genera from two dicotyledonous families, Amaranthaceae and Chenopodiaceae, the occurrence of the C 4 -dicarboxylic acid pathway of photosynthesis correlates with low ribulose diphosphate carboxylase activity, high activities of phosphopyruvate car boxylase and phosphate synthetase, a unique type of leaf anatomy, and high photosynthesis rates.

TL;DR: The major sterol of Enteromorpha intestinalis and Ulva lactuca has been identified as 28-isofucosterol as discussed by the authors, and gas-liquid chromatography has indicated the presence of cycloartenol and 24-methylene cycloartanol in both algae and 24ethylidene lophenol in E. intestinalis.

TL;DR: Only kaurene synthesis was inhibited by the plant growth inhibitor AMO 1618, and a mixed plastid and mitochondrial fraction greatly increased the formation of squalene, farnesol and geranylgeraniol but not theformation of phytoene and Kaurene.

TL;DR: Phenylalanine ammonia-lyase (PAL) activity increased rapidly on exposure of leaf disks to light and was correlated with the rates of synthesis of flavonoids as discussed by the authors.

TL;DR: In this article, cold storage of chicory and dandelion roots caused breakdown of inulin and high-molecular-weight oligosaccharides (degree of polymerization, D.P. > 10) in Jerusalem artichoke tubers.

TL;DR: A study of the substrate specificity of the enzymes suggests that the monophenol hydroxylase activity has no biosynthetic significance and that the main function of the enzyme is to provide a defence against wounding and infection by the oxidation of chlorogenic acid.

TL;DR: Three chemical types of Wittania somnifera (L.) Dun.

TL;DR: A more reliable method than previously available is also described for isolation of cyclopamine, the alkaloid that induces cyclopian teratogenic effects in sheep.

TL;DR: In this paper, different conditions for the extraction of soluble proteins from tobacco leaves were evaluated and the best results were obtained by mixing and homogenizing freshly harvested leaf material with a Tris-HCl buffer containing 0·5 M sucrose, 0·1 per cent ascorbic acid and 0· 1 per cent cysteine HCl at pH 8·0.

TL;DR: Alkaline hydrolysis of the stalk of all mutants and double mutants yielded p-coumaric and ferulic acids as major products and the greatest reduction of syringaldehyde occurred with the bm1/bm1 mutant and its double mutants.

TL;DR: Results of analyses of leaf wax alkanes and ω-hydroxy acids from members of the Cupressaceae and Pinaceae are reported and the possibility of defining a species or species group on a chemical basis is discussed.

TL;DR: The N -ethyl carbon of theanine was significantly incorporated into the phloroglucinol nucleus of catechins in tea shoots, and this incorporation was controlled by light.

TL;DR: The fruits of Psidium guava were examined at three different stages of growth to follow the chemical changes as mentioned in this paper, and an ester of hexahydroxydiphenic acid with l -arabinose has been obtained and its constitution established.

TL;DR: Since coniline and γ-coniceine differ only by two hydrogen atoms, it is suggested that these two alkaloids conhydrine and N-methyl coniine (IV) and the presence of some unknown alkaloid are also presented and commented on.