نتایج جستجو برای ' species '

Evaluation of the effect powder and aqueous extracts of some plant species on yield tomato and reproduction of Meloidogyne incognita Tomato plants (Lycopersicon esculentum), cultivar Shaft were grown in pots. Effect of aqueous extract of different plant species on the activity of root-knot nematode (Meloidogyne incognita) and the vegetative growth indices of the host plant, was investigated. Treatment of the nematode-inoculated tomatoes with plant extracts of Papaver rhoeas, Euphorbia helioscop...

Barberry is widely distributed throughout the world and recognized as a valuable plant. Different parts of barberry including fruits, flowers, leaves, stems and roots. It contains very important compounds such as anthocyanins, alkaloids, flavonoids, phenolic compounds, vitamins and etc., which have been used for many years in traditional medicine. However during all these years, a great part of this plant has wasted at the time of pruning, ornamenting and harvesting especially branches, stems an...

Generation of free radical species is an essential element of all free-radical polymerization reactions. A lot of organic molecules are stable at moderate and elevated temperatures. Therefore, in some reactions the addition of stable free radical which shows very little or almost no tendency in self-combination is of great importance, as free radical species are aimed to initiate reactant molecules in a specific reaction. The radical species differ in a wide range from organic to inorganic chemi...

This paper develops a theory of bio-thermal convection in a suspension that contains two species of microorganisms exhibiting different taxes, gyrotactic and oxytactic microorganisms. The developed theory is applied to investigating the onset of bio-thermal convection in such a suspension occupying a horizontal layer of finite depth. A linear stability analysis is utilized to derive the equations for the amplitudes of disturbances. The obtained eigenvalue problem is solved by the Galerkin method...

The objective of this study is to investigate the biodiversity of Euglenophta species from Tajan River of Mazandaran Province (North of Iran). A total of about 600 samples were collected from 9 stations (from Soleyman Tange Dam to the Caspian Sea) during 2011-2017. Totally 67 taxa (62 species + 5 varieties and forms) distinguished that all belong to Class of Euglenophyceae. 2 orders of Euglenales and Eutreptiales existed that each of them had 6 and 5 genera, respectively. five families identifie...

One of the most important problems in rangelands is saline soils which affects plant life and finally the whole ecosystem. Salinity tolerance in various stages of plant life is different. Using plants refractory to salinity and water scarcity is considered as one the most important effective methods in utilization and improvement of hectare utilization in saline lands of dry and semi dry regions of the world. So regarded to importance of soil salinity, germination and establishment of plants, th...

High concentrations of Cd, Pb, Cu and Cr can cause harmful effects to the environment. These highly toxic pollutants constitute a risk for aquatic and terrestrial life. They are associated with diverse bioavailable geochemical fractions, like the water-soluble fraction and the exchangeable fraction, and non-available fractions like those associated with the crystalline net of clays and silica minerals. Depending upon their chemical and physical properties we can distinguish different mechanisms ...

With the steady technological development enabling reduced device dimensions and new patient populations, detailed data on mechanical in vivo loads become increasingly important to ensure reliability of implantable medical devices. Based on an intra-species correlation of in-line and transverse force of the Pectoralis major established previously for the Chacma baboon ( de Vaal et al., 2010a ), a simplified physiological model and a mechanical equivalent model were developed for a sub-muscular p...

Inter-species differences in regeneration exist in various levels. One aspect is the dynamics of bone regeneration and healing, e.g. small animals show a faster healing response when compared to large animals. Mechanical as well as biological factors are known to play a key role in the process. However, it remains so far unknown whether different animals follow at all comparable mechano-biological rules during tissue regeneration, and in particular during bone healing. In this study, we investig...