The algal excretion product geranylacetone was proved to be an effective and novel inhibitor of carotene synthesis in Synechoccus 6911. The application of geranylacetone resulted in an ac­ cumulation of phytofluene, indicating an inhibition of the conversion of this compound into fcarotene. The cts-isomer of geranylacetone was as effective as the natural irans-isomer. The chloro­ phyll synthesi...

Nowadays, agricultural R&D provides new and developed technologies to create modern agricultural producing methods. During recent years, improving agricultural productivity is affected by not only domestic R&D investments but also foreign countries R&D investments. Nowadays, according to new growth models, R&D is the base of productivity. Recent economic theories consider agricultural research ...

R-trees can be used to store and query sets of point data in two or more dimensions. An easy way to construct and maintain R-trees for two-dimensional points, due to Kamel and Faloutsos, is to keep the points in the order in which they appear along the Hilbert curve. The R-tree will then store bounding boxes of points along contiguous sections of the curve, and the efficiency of the R-tree depe...

Studies on models synthesized by stereochemically controlled routes show that the central triene chromophore in the common cis isomer of phytoene has the irans,cis,trans configuration, and that the phytoene from Flavobacterium dehydrogenans consists mainly of the all-trans isomer. Capsorubin, with the natural configuration at all four chiral centres, has been synthesized from (+)-camphor. Sever...

the optimal cropping pattern for sistan water resources management was determined through a goal programming technique within the gams programming environment. results showed that the optimum cultivation area and net profit of the agricultural sector in the sistan region could increase up to 18.1 and 39.8%, respectively, compared to the current status. an increase in the farm irrigation efficie...