in order to understand the effects of different organic and chemical fertilizer on stigma yield, corm characterstics and leaf dry matter yield (as a forage) of saffron (crocus sativus l.), an experiment was conducted in the research station of faculty of agriculture, ferdowsi university of mashhad, iran, in 2005-2009; as a randomized complete block design with 12 treatments and three replicatio...

We investigate massive star formation in turbulent, magnetized, parsec-scale clumps of molecular clouds including protostellar outflow feedback using three dimensional numerical simulations of effective resolution 2048. The calculations are carried out using a block structured adaptive mesh refinement code that solves the ideal MHD equations including self-gravity and implements accreting sink ...

We looked at the diversity of [NO(2)](-) oxidizers at field scale by examining isolates at clump scale and in microsamples of soil (diameter, 50 microm). The genetic distances (as determined by amplified ribosomal DNA restriction analysis performed with Nitrobacter-specific primers) in a small clump of soil were as large as those between reference strains from large geographical areas. Diversit...

Variations of ∼ 0.4 mag are expected in the I-band absolute magnitude of red clump giants, M I , as a function of both stellar age and metallicity. This regardless of some potential theoretical uncertainties. Due to the quite large differences in mean ages and metallicities of clump stars among galaxies, systematic changes (also amounting up to ∼ 0.4 mag) come out in their M I . These numbers a...

The evolution of the speed of astrophysical jets relative to the ambient medium is investigated using a simple model. We assume that a jet clump is under the influence of the relativistic tidal force of the central source as well as the plasma force due to the electromagnetic field of the ambient medium. The resulting equation of motion predicts that in time the speed of the clump tends to the ...

Context. The role played by protostellar feedback in clustered star formation is still a matter of debate. In particular, protostellar outflows have been proposed as a source of turbulence in cluster-forming clumps, which may provide support against global collapse for several free-fall times. Aims. Here, we seek to test the above hypothesis in the case of the well-documented NGC 2264-C protocl...

Building on the detection of the J = 7−6 SiO maser emission in both the v = 1 and v = 2 vibrational states towards the symbiotic Mira, R Aquarii, we have used the James Clerk Maxwell Telescope to study the changes in the SiO maser features from R Aqr over a stellar pulsational period. The observations, complemented by contemporaneous data taken at 86GHz, represent a test of the popular thermal-...