Expression of streptavidin in tomato resulted in abnormal plant development that could be restored by biotin application.

Biotin is an essential cofactor for a variety of carboxylase and decarboxylase reactions and is involved in diverse metabolic pathways of all organisms. In the present study we tested the hypothesis that controlling biotin availability by the expression of Streptomyces avidinii streptavidin, would impede plant development. Transient expression of streptavidin fused to plant signal peptide, bacterial signal peptide or both, in tomato (Lycopersicon esculentum cv.

Salieri's dilemma: a counterpoint between envy and appreciation.

Taking as its starting point Klein's concepts of 1957, this paper stresses certain characteristics of envy that have not yet been taken into account in psychoanalysis. Klein described the conflict between envy and gratitude as inherent in the human being; she suggested an interesting link between envy and admiration, but never developed this idea in her theory. The hypothesis that we put forward in this paper is the existence of a particular intolerance-related to envy-of one's own capacity to recognise the valuable aspects of the object.

Serological grouping of indigenous Bradyrhizobium sp. (Arachis) isolated from various soils of Thailand.

ELISA and antibody adsorption tests were applied to determine the minimal somatic antigen constitution of 243 strains of Bradyrhizobium sp. (Arachis) using 12 antisera. The 243 indigenous bradyrhizobial isolates were from 15 sites in four regions of Thailand.