Showing papers in "Phytochemistry in 1973"

TL;DR: The literature concerning the physiology and biochemistry of the enzyme phenylalanine ammonia lyase (PAL) (E.C. 4.1.1) from different organisms has been reviewed as mentioned in this paper.

TL;DR: In this article, the relative astringency of tannins is determined by their reaction with the proteins of haemolysed blood and calorimetric determination of residual haemoglobin.

TL;DR: In this paper, a quantitative analysis of the results showed that the sum of starch + sugar + CO 2 expressed in equivalent anhydrohexose units did not change throughout the various changes in temperature.

TL;DR: In this article, the carboxylic group of the acid was bound to carbohydrate by ester bonds and the MW of these esters varied from a few hundred to over 50 000.

TL;DR: The composition and biosynthesis of ergosterol in these organisms and comparison to plant and animal sterol formation are made are made.

TL;DR: In this article, changes in the polysaccharide composition of apple fruits ripening on and off the tree were compared, and DEAE-cellulose chromatography showed that this polyuronide was free from neutral sugar residues.

TL;DR: The diversity of essential oils of Thymus vulgaris L., native in France, arises from the existence of 6 chemotypes, whose specific characters are stable both in natural habitats and in experimental culture, and are hereditically transmissible.

TL;DR: Methods, based on haemanalysis, have been developed for determining the tannic acid equivalent and the relative astringency in leaf tissue finely divided by milling and sieving.

TL;DR: The principal free amino acid present in seed of Trigonella foenum-graecum has been isolated and identified as (2 S, 3 R, 4 R )-4-hydroxyisoleucine, a component of the toxic peptide, γ-amanitin, produced by Amanita phalloides.

TL;DR: In this paper, a method for the routine determination of absolute amounts of free indolyl-3-acetic acid (IAA) in plant material is described and the time required for a determination is in the order of 2 hours.

TL;DR: During Maceration of freshly picked tea leaves, the amounts of trans -2-hexenal quickly increased and were influenced by maceration time, heating, oxygen and the pH, but in unpicked tea leaves the occurrence of trans-2- hexenal is extremely doubtful.

TL;DR: From 66 to 100 days ester content of wax increases, especially in Selkirk wheat, apparently due to formation of wax containing high proportions of esters of trans-α,β-unsaturated C22 and C24 acids.

TL;DR: Three C 18 epoxy acids occur in plant cutins and suberins and can be easily converted into their corresponding alkoxyhydrin alkyl esters on depolymerization of cutin or suberin by alcoholysis.

TL;DR: In this paper, 24 different flavonoid glycosides were isolated from illuminated cell suspension cultures of parsley (Petroselinum hortense) and the chemical structures of fourteen of these compounds were further characterized.

TL;DR: A number of adenine derivatives with cytokinin activity were isolated from immature sweet corn (Zea mays) kernels as discussed by the authors, and the following structures were assigned: 9-β- d -ribofuranosylzeatin, 9- β- d −ribofurananosylizatin 5′-monophosphate, 6-(1-carboxy-2-hydroxypropylamino)-9-ribofurusylpurine.

TL;DR: A new isoflavone was isolated from soya beans and shown to be 7,4′-dihydroxy, 6-methoxyis oflavone, for which the name glycitein is proposed.

TL;DR: Extraction of maturing Phaseolus vulgaris seeds with an ascorbic acid-NaCI medium facilitated the preparation of two globulin fractions which wer as mentioned in this paper, which can be used for protein synthesis.

TL;DR: In this paper, the formation of dihydroisocoumarins (I and II), the chromones (III and IV) and scopoletin (V) is induced in carrot roots by storage in the presence of low concentrations of ethylene and by inoculation with various fungi.

TL;DR: In this article, GLC techniques are used to measure isoprene emission from leaves of leaves of the same species and identify it as a light dependent natural plant emission, which is known as light dependent plant emission.

TL;DR: This phytoalexin, the second to be identified in the Orchidaceae, is less effective than orchinol, and its isomeric co-metabolite, loroglossol, 5-hydroxy-2,4-dimethyoxy-9,10-dihydrophenanthrene, is inactive.

TL;DR: 7-Methyljuglone, isodiospyrin, the 2,2′-binaphthyl-1,1′-quinone, and a new quinone (IV) were isolated from the phytochemical deposits of E. coli.

TL;DR: A numerical analysis of these biochemical data, together with morphological characters, produces a new classification which suggests that the flavonoid data may have more systematic value than is indicated when they are applied to the traditional classification.

TL;DR: Leaf waxes from spring wheat varieties Selkirk and Manitou contain hydrocarbons (6, 10), long chain esters (14, 13), free acids (5, 8), free alcohols (19, 21), β-diketone (16, 20), hydroxy β-Diketones (8, 10%), unidentified gum (29, 16.5%), and minor amounts of diol diesters, glycerides and aldehydes as mentioned in this paper.

TL;DR: Traditional degradative extractants were used to obtain soluble components for further characterization of apple fruit cell walls and the possibility of linkages existing in the cell wall between polyuronide and glycoproteins containing hydroxyproline, arabinose and galactose residues is discussed.

TL;DR: In this paper, putrescine was found to be reduced in phosphorus (× 0·6), sulphur (x 0·5) and nitrogen (x 1·2) deficiencies and on substituting nitrate for ammonium (X 0·2).

TL;DR: The mesophyll is likely to be a major site for sucrose synthesis in maize leaves, and the starch content and activities of ADPglucose (ADPG) starch synthetase and phosphorylase expressed both on a chlorophyll and a protein basis were much lower compared to bundle sheath preparations.

TL;DR: In this paper, a series of oxygenated carotenoids has been isolated from tomatoes by comparison of their chromatographic and spectroscopic properties with those of semisynthetic samples.

TL;DR: A series of sixteen pyrazolo[4,3- d ]pyrimidine derivatives has been synthesized and tested for cytokinin antagonist activity in the tobacco bioassay.