This paper presents fundamentally new evidence on the rate of economic assimilation by immigrants in the United States. Previous analyses based on the decennial Census are subject to bias due to nonrandom return migration. Using 40 years of longitudinal data on a nationally representative sample of natives and immigrants, I show that Census-based estimates of assimilation in earnings are biased...

Tobacco is a salt-sensitive glycophyte crop species. In this work effect of silicone (Si) supplementation (1 mM as Na2SiO3) was studied in Nicotiana rustica L. cv. Basmas grown hydroponically in growth chamber under control, low (25 mM) and high (75 mM) NaCl concentration for two weeks. Dry matter production of leaves was depressed by salinity level as low as 25 mM and higher salt concentration...

To assess the variability of net photosynthetic CO(2) exchange per unit leaf area and to construct budgets for stands of field-grown tobacco (Nicotiana tabacum, Connecticut Broadleaf), a number of short-time measurements were made on all available leaf positions on two varieties using a hand-held transparent chamber for conducting gas exchange measurements on leaves. Measurements of net CO(2) e...

Utilization of naturally-occurring dissolved free and combined amino acids (DFAA and DCAA) and dissolved DNA (D-DNA) was studied in batch cultures of bacteria from 2 shallow marine environments, Santa Rosa Sound (SRS), Florida. USA, and Flax Pond (FP), Long Island, New York, USA. In addition to control experiments, cultures were enriched with various sources of C and N. In the SRS cultures, net...

in order to study the effect of intercropping (mix cropping) of three sesame genotypes (sabzevar, kashmar and kalat) a field experiment was conducted based on a complete randomized block design with three replications at research station, college of agriculture ferdowsi university of mashhad, in year 2009. the experimental treatments were: sole cultivation of sabzevar, kalat, kashmar genotypes,...

in order to determine the best traits related to indirect increasing of grain yield, five wheat genotypes (zagros, tajan, durum cul., kohdasht and n-81-18 line) were evaluated by using randomized complete block design (rcbd) with 4 replications in research field of gorgan university of agricultural sciences and natural recourses. the studied traits included leaf area index (lai), crop growth ra...

The expression and activity of glutamine synthetase (GS, EC 6.3.1.2) were examined in relation to the rate of CO2 assimilation in sun ̄ower (Helianthus annuus L.) leaves. Intact plants were kept in the dark for 72 h and subsequently exposed to light under different atmospheric CO2 concentrations (100, 400 and 1200 ml l) for 6 h. The in vivo rates of net CO2 assimilation correlated with atmospher...