abstract iran is among the country that despite the possession of valuable natural resources does not placed in developed countries. expansion of agricultural exports through the development of rural areas, reducing poverty and exclusion zones, in the process of economic development plays a key role. the export of horticultural products can have a positive impact on agricultural development. in...

The question of whether ocean iron fertilization (OIF) can yield verifiable carbon sequestration is often cast in terms of whether fertilization results in enhanced particle export. However, model studies show that oceanic carbon storage is only weakly related to global particle export — depending instead on an increase in the carbon associated with the pool of remineralized nutrients. The magn...

The polyketide natural product Leptomycin B inhibits nuclear export mediated by the karyopherin protein chromosomal region maintenance 1 (CRM1). Here, we present 1.8- to 2.0-Å-resolution crystal structures of CRM1 bound to Leptomycin B and related inhibitors Anguinomycin A and Ratjadone A. Structural and complementary chemical analyses reveal an unexpected mechanism of inhibition involving cova...