Plants vary greatly in their ability to survive freezing temperatures. At one extreme are plants from tropical regions that have virtually no capacity to survive even the slightest freeze. In contrast, herbaceous plants from temperate regions generally survive freezing temperatures ranging from 25°C to 230°C, depending on the species, whereas perennials in the boreal forests routinely survive w...

1. Two experiments were conducted to study the digestion of nitrogenous constituents in the rumen, small intestine and caecum and colon of sheep given diets of grass silage or grass silage and barley. Three silages were used. One was made from first-harvest grass in the spring and the other from regrowth grass cut in either early autumn or late autumn. All were of perennial ryegrass (Lolium pe...

The article presents findings on the content of radon isotopes in air buildings maintained Kurchatov t., dependence concentrations residential and administrative a season assessed as well type premises their purpose. Seasonal variations were studied by measuring equivalent equilibrium volumetric activity (EEVA) (VA) radon. For first time, activities industrial have been determined. Data showed ...

The gonadal development of cultured and wild mussels (Mytilus galloprovincialis) was studied in several localities of the Ria de Vigo (NW Spain) from December 1987 to June 1993. In the mussel populations examined, a stable reproductive pattern, with minor variations, was found. Gametogenesis takes place in late autumn and early winter. In late winter, gonad follicles are full of ripe gametes an...

Abstract. As temperatures decrease in autumn, vegetation of temperate and boreal ecosystems increases its tolerance to freezing. This process, known as hardening, results a set physiological changes at the molecular level that initiate modifications cell membrane composition synthesis anti-freeze proteins. Together with freezing extracellular water, proteins reduce plant water potentials xylem ...

OBJECTIVE To report an efficacy of gonadotropin releasing hormone (GnRH) antagonist administration after freezing of all embryos for treatment of early type ovarian hyperstimulation syndrome (OHSS). METHODS In 10 women who developed fulminant early type OHSS after freezing of all embryos, GnRH antagonist (cetrorelix 0.25 mg per day) was started at the time of hospitalization and continued for...