Steroidal Plant Growth Promoters vs. Phytopathogens, via Enzymatic Regulation;An in <i>Silico</i>Approach

Steroidal plant growth promoters (SPGP) have been continuously studied due to their high activity increasing biomass and resistance to diverse stress factors. In our hands, a new SPGP family of 22-oxocholestanic compounds stands out at a comparative level to brassinosteroids (BSs). The potential activity of new SPGP against phytopathogens was studied through in silico molecular docking, these assays were performed with relevant ensymes of phytopatogens Chitinase B and 1,3-β-Glucanase. Nine Chitinase B inhibitors and two 1,3-β-Glucanase inhibitors were proposed. The launched study analyzed the interactional and spatial level, determining the presence of interactions with key amino acids in receptors in comparison to reference inhibitors. Even more, the AVR4 and ECP6 effectors were also examined. No compound that blocks ECP6 was found;due to, probably, the influence of its highly hydrophilic environment. In the case of AVR4, two SPGP showed a better docking score (DS) than a chitin fragment (endogenous ligand);this fact demonstrates the latent potential of the 22-oxocholestanic derivatives against phytopathogens, with a specific regulation via proliferation inhibition. Moreover, this SPGP does not affect the symbiotic fungi that are beneficial for the natural plant system.

BF6M1013ECP型柴油机单体泵喷油正时的调整

德国道依茨BF6M1013ECP型高速、四冲程、增压、水冷、带中冷器强化型柴油机的喷油泵采用单体泵形式。单体泵是最新的技术之一,它使柴油机的燃烧更适合工况的需要,因而燃烧更充分,效率更高,降低了排放污染和燃油消耗率。该柴油机为6缸,共有6个单体喷油泵,采用BOSCH公司的211-1335型柱塞泵,其内部有一个高压注油单向阀。