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Fungal endophyte-infected grasses: Alkaloid accumulation and aphid response
The occurrence of the alkaloidsN-formyl andN-acetyl loline, peramine, lolitrem B, and ergovaline and the response of aphids to plants containing these compounds were determined in species andExpand
Chemistry, occurrence and biological effects of saturated pyrrolizidine alkaloids associated with endophyte-grass interactions
Abstract Saturated amino pyrrolizidine alkaloids with an oxygen bridge between C-2 and C-7 have been isolated from grasses and the chemistry and biology of these substances are reviewed in thisExpand
Production of loline alkaloids by the grass endophyte, Neotyphodium uncinatum, in defined media.
Kinetics of loline production and fungal growth were assessed in defined medium with defined medium, and the alkaloid production rate peaked after the onset of stationary phase, as is common for secondary metabolism in other microbes. Expand
Study of nicotine demethylation in Nicotiana otophora
Microsomes from Nicotiana otophora catalyze the demethylation of nicotine to nornicotine in the presence of NADPH and oxygen. Activity was maximal at pH 7.0-7.5 and 30 o C. The enzyme appeared to beExpand
The kinetic advantage for transport into hamster intestine of glucose generated from phlorizin by brush border β-glucosidase
Abstract Phlorizin, labeled with tritium only in the glucose moiety, was used as substrate for the β-glucosidase present in brush border membranes from hamster intestine in order to study,Expand
Contribution of Nicotine and Nornicotine toward the Production of N'-Nitrosonornicotine in Air-Cured Tobacco (Nicotiana tabacum).
The pattern of the enantiomeric composition of 1, 2, and 6 demonstrated that the direct formation of 6 from 1, if it occurs, is negligible in air-cured tobacco. Expand
Evidence for concurrent spread of tobacco mosaic virus from infected epidermal cells to neighboring epidermal and mesophyll cells
It is suggested that only epidermal cells were initially infected and that virus later spread from these cells to bothEpidermal and mesophyll cells in the inoculated leaves. Expand
A hydrolase-related transport system is not required to explain the intestinal uptke of glucose liberated from phlorizin.
The results indicate that the glucose released from phlorizin enters the tissue via the small fraction of the Na+-dependent glucose carriers which escape phlorIZin blockade together with a mannitol-like passive diffusion and enjoys a kinetic advantage for tissue entry over free glucose in the medum by virtue of the position of the site where it is formed. Expand
Isolation of a glucose-binding protein by affinity chromatography on phloretin-agarose.