Thursday, December 12, 2002

New Directions in Enology [New Scientist]
Paradoxe blanc, chardonnay vinified as if it were a red wine, restores plasma antioxidant capacity in diabetic rats. American Chemical Society members can read the article, and others, on the fatty acid composition of oils produced from different Sicilian olive cultivars; and the identification of 5 esters, 2 ketones, 5 phenolic derivatives, 2 alcohols, and 2 carboxylic acids that constitute the "aroma skeleton" of Calvados; Roundup treatments "have no effects on phytoestrogen levels in [RR] soybeans"; and finally, a discussion of methods for engineering Bt Cry1Ac proteins reveals:
It is now apparent that B. thuringiensis and B. cereus are often considered to be members of the same species on the basis of the similarity of their phenotypic properties, 16S and 23S rRNA gene sequences, common enterotoxin profiles, and comparable toxicity levels. B. thuringiensis has also been found to be involved in outbreaks of gastrointestinal disease.

On the basis of the above-described facts, it is thus important for the bioinsecticide industry to consider that although B. thuringiensis insecticide has been used for many years, B. thuringiensis may be introduced into the human food chain through the application of this bacteria species to crops. Although the production of enterotoxins by B. thuringiensis may be affected by the culture medium, time, and fermentation conditions, introduction of B. thuringiensis spores into the human food chain followed by spore regermination may cause a risk of food-borne poisoning cases. Accordingly, to reduce such a food-poisoning risk, it is better to isolate a non-enterotoxigenic B. thuringiensis strain for bioinsecticide production or to consider undertaking the simple expedient of deleting those enterotoxin genes from the commercial strains for the production of insecticidal crystal toxins.

[refs. removed for legibility]. This implies that crops genetically engineered to produce only one (or several, in the future) of the insecticidal proteins could be safer for humans than those sprayed with Bt...


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