The usual composition rule of independent systems, as applied to decoherent histories or to linearly positive histories, requires (at least) medium decoherence and, consequently, a second constraint for the linearly positive histories of Goldstein and Page. Other plausible classical features, valid for medium decoherence, seem anyhow to be missed by linear positive histories. ∗ E-mail: diosi@rm...

The composition of an arginine-glycerol-salt medium (AGS), suitable for the selective isolation of aerobic actinomycetes, was given. When soil samples were treated with calcium carbonate and plated on the AGS medium, higher total and relative plate counts of actinomycetes were obtained than when other media and methods were used.

BACKGROUND Nanoparticle-protein corona complex formation involves absorption of protein molecules onto nanoparticle surfaces in a physiological environment. Understanding the corona formation process is crucial in predicting nanoparticle behavior in biological systems, including applications of nanotoxicology and development of nano drug delivery platforms. METHOD This paper extends the model...

Objective: n present study effect of various factors including sucrose, agar, PEG, AgNO3, activated charcoal on somatic embryo induction and its subsequent regeneration was investigated using varieties Dom siah and Nemat. Methods: 330 explant (Mature embryos) of each varieties were cultured, 33/plate (100 x 15 mm), on callus induction Murashige and Skoog (MS) medium (Murashige and Sk...

The Mass Spectrometer Telescope (MAST) on SAMPEX is designed to provide high resolution measurements of the isotopic composition of energetic nuclei from He to Ni (Z = 2 to 28) over the energy range from -10 to several hundred MeV/nuc. During large solar flares MAST will measure the isotopic abundances of solar energetic particles to determine directly the composition of the solar corona, while...

The toxic effects of cations and anions depend (1) on cation imbalance involving the relative concentrations of the ions Na, K, Mg, Ca, Mn, Ba and Li and (2) on toxic effects independent of cation imbalance. Since both are related directly to the composition of the medium, it is necessary to define the medium and to stipulate that duplication of the results depends on duplication of growth cond...

saffron (crocus sativus l.) protoplasts were isolated from the cells of a suspension culture or calli with a solution of cellulase, pectinase and hemicellulase and embedded in ca-alginate beads. they were cultured with or without nurse cells in ms medium supplemented with 2,4-d and 6-benzylaminopurine at 25°c. after several changes of medium, cell-clusters appeared on the surface of the ca-algi...

Drought stress is one of the main non-biological factors limiting the growth and yield of plants in dry and semi-dry regions of the world. Plants are the source of much chemicals derived from secondary metabolism. Carum copticum is a plant from the Apiaceae family with the seeds containing 2-4% the essential oil which are rich in monoterpenes such as thymol and are widely used as an antibacteri...

The production of auxin by yeast ceils resembles the formation observed in other organisms such as Rhizopus and Rkizobiura (Thimann, 1939) I which "release" auxins into their culture medium. Thus, we have found far more auxin in the growth medium of yeast than KSgl and Kostermans 2 extracted from the cells. The amounts of auxin in the growth medium were found to vary considerably with the age o...