Vibrational Spectra of Tetraphosphorus Tetrasulphides The solid-state i.r. and Raman spectra of the crystalline tetraphosphorus tetrasulphides — 0C-P4S4 and ß-V/jß^ — and the Raman spectrum of the 0C-P4S4 melt have been recorded. The observed frequencies of 0C-P4S4 were tentatively assigned to P4S4 molecules of the cradle type, possessing Ü2d symmetry. An assignment of the /9-P4S4 frequencies t...

many characteristics of pear trees such as growth, fruit size and yield, are influenced by the genetic characteristic of the rootstocks. in iran, mainly european pear seedlings (pyrus communis l.) are used as the rootstock in the pear orchards. thus, evaluation of pear seedling rootstocks is an important task. this experiment was conducted in 2009 and 2010 growing seasons in order to explore th...

to determine the effect of seed size of sugar beet cultivars on germination and seedling vigor, a study was conducted as a 4×6 factorial experiment based on completely randomized design with 4 replications at seed and plant certification and registration institute, karaj in 2013. the treatments were toucan, dorotea, rasta, sharif, pars, and torbat cultivars and four seed width sizes including 2...

Relevance. Cold exposure increases sympathetic activity and blood pressure. It can also promote intensification of hypertension symptoms its progress in winter. However, the mechanisms this phenomenon are poorly understood. Intention: To determine dynamics cardiovascular parameters young people with different initial autonomic regulation heart rate during experimental general cold exposure. Met...

The effect of scarification and stratification treatments on germination seedling vigour fresh teak drupes was investigated. were subjected to the following viz., control, acid (500 mL/kg drupe) for 5, 10, 15, 20, 25, 30, 40, 50 60 min. Cold 40 days at 5o C. Warm 40o treated control sown in sand filled earthen pots placed direct sunlight assessing germination. experiment conducted a Completely ...

Here we describe the seed shadow, seedling recruitment, ontogenetic structure and spatial distribution of Buchenavia capitata (an emergent canopy tree) in a 380-ha fragment of the Atlantic forest in northeast Brazil. In particular, we examine seed distribution around 10 parental trees and both seedling recruitment and mortality, during an 18 month period beneath and around parental trees. Moreo...