a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...

This experiment was performed to investigate the possibility of barley-bitter vetch intercropping under field conditions, based on factorial using randomized complete blocks design with three replications, at the Agricultural Research Station of Bu-Ali Sina University, Hamadan, Iran. Treatments were sole cropping of barley (200, 300 and 400 plants/m2 densities), sole cropping of bitter vetch (2...

abstract the present study was conducted to examine the effect of proficiency on students interaction while carrying out the grammar-based task(s) in collaboration. in particular, the study examines whether the level of proficiency affects the learners’ focus of attention to grammatical and lexical features. the study takes a further step and examines whether there is any difference in the use...

rested on sociocultural theory (sct), this study attempted to examine the effect of written corrective feedback (wcf) followed by producing written languaging on developing writing accuracy over new tasks. to this aim, two intact iranian efl classes at the low-intermediate level were randomly assigned to two experimental groups: direct (n = 25) and indirect (n = 25). both groups wrote on a numb...

abstract venlafaxine, 1–[2–(dimethylamino)–1–(4–methoxyphenyl) ethyl]cyclohexanol hydrochloride is a novel non-tricyclic antidepressant. venlafaxine is a second generation antidepressant drug, has a neuropharmacologic profile distinct from that of existing antidepressants including tricyclic compounds, selective serotonin reuptake inhibitors and monoamine oxidase inhibitors. venlafaxine impart...

The aim of this research was to assessment of drought tolerance in bitter vetch (Vicia ervilia L.) ecotypes. For this purpose, 16 ecotypes collected from four provinces (East Azerbaijan, West Azerbaijan, Ardabil and Zanjan) of Iran, were evaluated using randomized complete block design with four replications in three separate experiments (60, 90 and 120 mm water evaporation from A pan) during 2...