The myxocoumarins A and B from Stigmatella aurantiaca strain MYX-030.

The myxobacterial strain Stigmatella aurantiaca MYX-030 was selected as promising source for the discovery of new biologically active natural products by our screening methodology. The isolation, structure elucidation and initial biological evaluation of the myxocoumarins derived from this strain are described in this work. These compounds comprise an unusual structural framework and exhibit remarkable antifungal properties.

Pathogenesis-related PR-1 proteins are antifungal. Isolation and characterization of three 14-kilodalton proteins of tomato and of a basic PR-1 of tobacco with inhibitory activity against Phytophthora infestans.

Three distinct basic 14-kD proteins, P14a, P14b, and P14c, were isolated from tomato (Lycopersicon esculentum Mill. cv Baby) leaves infected with Phytophthora infestans. They exhibited antifungal activity against P.

Effect of Jasmonic Acid on the Interaction of Barley (Hordeum vulgare L.) with the Powdery Mildew Erysiphe graminis f.sp. hordei.

Jasmonic acid or its methyl ester induce de novo synthesis of a number of proteins of mostly unknown function in barley (Hordeum vulgare L.). In a topical spray application, 30 [mu]g of jasmonic acid per plant effectively protected barley against subsequent infection by Erysiphe graminis f.

Quartz: synthesis at Earth-surface conditions.

Quartz has been crystallized directly from seawater at room temperature. This is the first time that identifiable quartz has been synthesized in aqueous solution at earth-surface conditions without the aging of an original amorphous precipitate. The concentration of dissolved silica in equilibrium with quartz at 20 degrees C and 1 atmosphere is 4.