排序方式: 共有24条查询结果,搜索用时 15 毫秒
21.
Marília Caixeta Franco Sérvio Tulio Cassini Valter Rodrigues Oliveira Clibas Vieira Siu Mui Tsai Cosme Damiao Cruz 《Euphytica》2001,118(3):265-270
Ten F1's obtained from crosses among five common bean genotypes of Andean (WAF 15, Mineiro Precoce and Batatinha) and Middle American
(BAT 304 and Ouro) gene pools were assessed for their combining abilities for root nodulation with Rhizobium tropici strain CIAT 899. The plants were grown under controlled conditions and evaluated for number of nodules per plant (NN), nodule
dry weight (NDW), mean nodule weight (MNW) and plant fresh weight (PFW). The subdivision of the treatment effects on the general
(GCA) and specific combining effects (SCA) were performed according to Griffing's diallel analysis method 2, model 1. The
analyses of variance and estimates of quadratic components showed that non-additive gene effects were more important in the
expression of NN and PFW, whereas additive gene effect was predominant for NDW and MNW. A close association was observed between
high number of nodules and GCA. Generally, crosses involving parents of different gene pools yielded hybrids with high positive
estimates of SCA for all assessed traits. The genotypes of Andean origin WAF 15 and Mineiro Precoce are the most promising
parents for breeding programs to increase NN and NDW in common beans.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
22.
Becegato Valter A. Becegato Vitor R. Baum Camila A. Lavnitcki Laís Paulino Alexandre T. 《Journal of Soils and Sediments》2019,19(4):1901-1910
Journal of Soils and Sediments - Multivariate statistical analysis was used for the correlation of 238U, 232Th, and 40K equivalent activities to geochemical data from soil samples collected at... 相似文献
23.
Volpe Angela D’Arpa Stefania Del Moro Guido Rossetti Simona Tandoi Valter Uricchio Vito Felice 《Water, air, and soil pollution》2012,223(4):1773-1782
An environmentally friendly procedure suitable to restore a protected area was evaluated at laboratory scale. Soil contaminated
by high molecular weight (C > 10) aliphatic hydrocarbons and by chromium was withdrawn from the study site and a qualitative
study of soil hydrocarbon components was first performed in order to assess the potential source of contamination. To this
aim, a number of characteristic diagnostic ratios of hydrocarbon components were derived by processing chromatographic data,
and were used as indicators for distinguishing anthropogenic from natural hydrocarbons. Then, the efficiency of landfarming
for soil remediation was tested by comparing the effect of a few selected amendments and by monitoring the fate of chromium.
Soil microbial abundance and activity were also evaluated. Results showed that soil hydrocarbons were mainly of anthropogenic
origin and land treatment allowed effective degradation by native microbial populations even in the absence of amendments.
The investigated procedures had no effect on the mobilisation of chromium that remained in its stable form of Cr(III). Conventional
land treatment may therefore be an effective and safe procedure for the removal of hydrocarbons even in the presence of chromium,
and may be applied to areas where low-impact procedures are strictly required. 相似文献
24.
Iraklis Panagiotakis Daniel Mamais Marina Pantazidou Simona Rossetti Federico Aulenta Valter Tandoi 《Water, air, and soil pollution》2014,225(1):1-14
Urban stormwater runoff is contaminated by nutrients that wash off of roadways, parking lots and lawns during storms. In-ground permeable filter systems that consist of carefully selected filter material have the potential to remove these nutrients from the run-off. In this paper, four filter materials, calcite, zeolite, sand and iron filings, were investigated using laboratory batch tests to evaluate their efficiency in the removal of nitrate and phosphate from the simulated stormwater at different initial concentrations under the same 24-h exposure time period. The range of removal for nitrate was from 39 % to 65 % for calcite, from 42 % to 77 % for zeolite, from 40 % to 70 % for sand, and from 74 % to 100 % for iron filings. The removal of phosphate ranged from 35 % to 41 % for calcite, 59 % to 100 % for zeolite, 49 % to 100 % for sand, and 73 % to 100 % for iron filings. The removal of nitrate is mainly attributed to electrostatic adsorption, except when iron filings were used as a filter material where additional processes such as electrochemical reduction, ligand complexation and precipitation may have contributed to the higher nitrate removal. Phosphate removal is also attributed to electrostatic adsorption in all filter materials; however, at higher phosphate concentrations, the precipitation process may be the dominant process for all of the filter materials except calcite. The Langmuir and Freundlich isotherms fitted the observed nonlinear adsorption results, but the mechanism of removal of phosphate changed from adsorption to precipitation at concentrations higher than 1 mg/l in zeolite, sand, and iron filings; therefore, the adsorption models are valid below this concentration limit. A typical application of these batch adsorption test results is presented in the design of a field in-ground permeable filter system. 相似文献