Effects of bituminous emulsions on retention and release of some chemical elements in two soil samples     

N. Salem  M. Verloo  M. De Boodt 《Geoderma》1985,35(3):241-249

The effects of bituminous emulsions on the retention and release of some nutrient elements and heavy metals were investigated in the laboratory for a pair of different soil samples, one from each of Egypt and Belgium. The emulsion was applied at several rates to promote the formation of aggregates, to stabilize them, and to make the soil samples more hydrophobic. The quantities of extractable potassium and trace elements were determined for the untreated and treated samples, as well as for aggregates more than 2 mm in diameter before and after destruction.The results show that addition of bituminous emulsion increases aggregation percentage and aggregate stability, and decreases the extractable amounts of elements. This effect increases with increasing concentration of bituminous emulsion. The extractable amounts of the nutrient elements after destruction of the aggregates were higher than those before destruction. The mechanisms of retention and release of nutrient elements before and after destroying the aggregates are schematically presented and discussed.  相似文献   

Genetic inheritance analysis of four enzymes in date-palm (Phoenix dactylifera L.)     

Ali Ould Mohamed Salem  Mokhtar Trifi  Hela Sakka  Abdelmejid Rhouma  Mohamed Marrakchi 《Genetic Resources and Crop Evolution》2001,48(4):361-368

The genetic inheritance of four date-palm enzymes hasbeen carried out in 29 Tunisian cultivars. Our data provide evidenceof five polymorphic genes involving 12 alleles. It has been assumedthat either Pgm or Shdh are specified by three different alleles,while Got-1, Got-2 and Pgi-2 loci are biallelicgenes. On the other hand, analysis throughout progenies of twocontrolled crosses support significantly these hypothesis. In thewhole, results are in agreement with reports that describeddate-palm isozymes. Nevertheless, we assume that other alleleare involved in Pgm gene. Also, isozymes controlled by Got-2locus are of a dimeric structure. Opportunely, it can be establishedthat the resultant isoenzymes would constitute polymorphic markerssuitable to analyze the genetic diversity in date-palm.  相似文献   

Untersuchungen über die Beziehungen zwischen Mykorrhiza-Pilzen,Meloidogyne javanica (Treub) (Nematoda), Wurzelgallen-Dichte und Wachstum von Bohnenpflanzen     

Dr. F. M. Salem  M. A. Salem  Kareman Fawaz  S. H. Michail 《Journal of pest science》1984,57(4):72-74

The interaction between certain mycorrhizal fungi andMeloidogyne javanica on the growth and formation of knots on Broad Bean roots was studied.Fusarium equiseti andPythium butleri increased the phosphorus content of the seedlings and reduced the pathological stress on the seedlings through decreasing the number of root knots formed. Such results suggest that VA mycorrhizae might limit nematode activity and could be applied as a nematode control measure. The high rates of phosphorus fertilizers applied to broad bean could also be decreased.  相似文献   

Zur Wirkung des Häutungshemmers Dimilin auf eine Population Wurzelnematoden bei Mais     

Dr. F. M. Salem 《Journal of pest science》1979,52(7):107-108

Dimilin 0,5 G at the rate of 0,300 g a. i. per feddan was tested against nematode community,Pratylenchus, Tylenchorhynchus, andCriconemoides in maize field as over-all treatment after harvesting clover crop and preplanting maize. Dimilin reduced the population of the mixed nematode community (40,2% reduction) in comparison with the untreated checks. No phytotoxicity took place on maize plants.  相似文献   

Carol J. Adams. The Sexual Politics of Meat: A Feminist-Vegetarian Critical Theory, Tenth Anniversary Edition; Kathryn Paxton George. Animal, Vegetable, or Woman? A Feminist Critique of Ethical Vegetarianism; Michael Allen Fox. Deep Vegetarianism     

Stewart Lockie  Jen Hayward  Nell Salem 《Agriculture and Human Values》2002,19(4):361-363

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Scandium clusters in fullerene cages     

Yannoni CS  Hoinkis M  de Vries MS  Bethune DS  Salem JR  Crowder MS  Johnson RD 《Science (New York, N.Y.)》1992,256(5060):1191-1192

The production and spectroscopic characterization of fullerene-encapsulated metal-atom clusters is reported. In particular, both solution and solid-state electron paramagnetic resonance (EPR) spectra of Sc(3)C(82) have been obtained. ScC(82) also gives an EPR spectrum, but Sc2Cn species-the most abundant metallofullerenes in the mass spectrum-are EPR-silent even though Sc(2) is EPR-active in a rare-gas matrix at 4.2 K. The results suggest that the three scandium atoms in Sc(3)C(82) form an equilateral triangle-as was previously suggested for Sc(3) molecules isolated in a cryogenic rare-gas matrix. The spectrum of ScC(82) has features similar to those found earlier for LaC(82) and YC(82), suggesting that it can also be described as a +3 metal cation within a -3 fullerene radical anion. An implication of this work is that production of macroscopic quantities of clustercontaining fullerenes may make possible the fabrication of exotic new structures with regular arrays of metal-atom clusters isolated in fullerene molecules, resulting in a new type of host/guest nanostructured material.  相似文献   

Direct-fed microbial:Animal nutrition and reproduction responses     

Abdelfattah Z M Salem  Nicolas Di Lorenzo 《中国农业科学(英文版)》2015,(3):494-496

Manipulating the gastrointestinal microbial ecosystem to enhance animal performance and reproductive responses has been one of the main goals of animal science researchers and veterinarians.Recent restrictions to the use of antimicrobials as growth promoters led researchers to seek alternative practices that can show promise both from the standpoint of efficacy as well as from the practical and economic aspects.  相似文献   

Direct-fed microbes:A tool for improving the utilization of low quality roughages in ruminants     

Mona M Y Elghandour  Abdelfattah Z M Salem  Jose S Martínez Castaeda  Luis M Camacho  Ahmed E Kholif  Juan C Vázquez Chagoyán 《中国农业科学(英文版)》2015,(3):526-533

For many years, ruminant nutritionists and microbiologists have been interested in manipulating the microbial ecosystem of the rumen to improve production efficiency of different ruminant species. Removal and restriction of antibiotics subtherapeutic uses from ruminant diets has amplified interest in improving nutrient utilization and animal performance and search for more safe alternatives. Some bacterial and fungal microorganisms as a direct-fed microbial(DFM) can be the most suitable solutions. Microorganisms that are commonly used in DFM for ruminants may be classified mainly as lactic acid producing bacteria(LAB), lactic acid utilizing bacteria(LUB), or other microorganism’s species like Lactobacillus, Bifidobacterium, Enterococcus, Streptococcus, Bacillus, Propionibacterium, Megasphaera elsdenii and Prevotellabryantii, in addition to some fungal species of yeast such as Saccharomyces and Aspergillus. A definitive mode of action for bacterial or fungal DFM has not been established; although a variety of mechanisms have been suggested. Bacterial DFM potentially moderate rumen conditions, and improve weight gain and feed efficiency. Fungal DFM may reduce harmful oxygen from the rumen, prevent excess lactate production, increase feed digestibility, and alter rumen fermentation patterns. DFM may also compete with and inhibit the growth of pathogens, immune system modulation, and modulate microbial balance in the gastrointestinal tract. Improved dry matter intake, milk yield, fat corrected milk yield and milk fat content were obtained with DFM administration. However, the response to DFM is not constant; depending on dosages, feeding times and frequencies, and strains of DFM. Nonetheless, recent studies have supported the positive effects of DFM on ruminant performance.  相似文献   

Effects of organic chromium supplementation to ifnishing lambs diet on growth performance,carcass characteristics and meat quality     

Laura Moreno-Camarena  Ignacio Domnguez-Vara  Jos Brquez-Gastelum  Juan Snchez-Torres  Juan Pinos-Rodrguez  Antonia Mariezcurrena-Berasain  Ernesto Morales-Almarz  Abdelfattah Z M Salem 《中国农业科学(英文版)》2015,(3)

The objective of this study was to evaluate supplemental organic chromium (Cr) to ifnishing lambs on growth performance, carcass characteristics, and meat quality. Eighteen Suffolk lambs (age (4.5±0.2)...  相似文献   

<Emphasis Type="Italic">Limoniastrum monopetalum</Emphasis> stems as a new source of natural colorant for dyeing wool fabrics     

Amel Bouzidi  Noureddine Baaka  Nidhal Salem  Mohamed Farouk Mhenni  Zine Mighri 《Fibers and Polymers》2016,17(8):1256-1261

In the present study, an attempt has been made to dye the wool fabric with Limoniastrum monopetalum stems, as a source of natural dye, which has not been exploited so far. Optimization of extraction parameters was done. Optimum results of extraction process were obtained with a dye concentration of 60 g/l, a temperature of 90 °C during 100 min. The study of different factors effecting dyeability of wool fabrics by aqueous L. monopetalum stems extract showed that the pH of dye bath and dyeing temperature and time affected considerably the color yield. The best results were obtained at the following conditions; pH 2, 100 °C, and 60 min. Metal mordants, when used in conjunction with L. monopetalum dye, allowed to obtain various shades. The determination of phenolic contents of aqueous L. monopetalum stems extract showed a high amount of phenolic components. Based on RP-HPLC, the coloring extract of L. monopetalum stems contains tannins and polyphenols. The major identified phenolic compounds were procatechuic, Trans-cinnamic and gallic acids. Hence, aqueous L. monopetalum stems extract could be successfully exploited for dyeing wool fabrics with high color yield (K/S).  相似文献