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A wide interest has been directed during the last two decades to environmental pollution. Chemical pesticides are main sources of this pollution, causing numerous hazards to non-target organisms, including human beings. Biological control of pests is one of the most promising alternatives; among the elements of this method of control are botanical insecticides. Insecticidal activities of methanol, acetone, hexane extracts of eleven plants against the stored grain pest Corcyra cephalonica (serious pest of some important stored food such as rice, wheat, maize, sorghum, groundnut, cotton seeds, and cocoa beans) were investigated. Methanol extracts of Penstemon hirsutus and Plantago sinica exhibited the highest insecticidal activity against C. cephalonica. Ten compounds were isolated and identified, from plant extracts of Penstemon hirsutus and Plantago sinica,also, the isolated compounds had pesticidal effects against C. cephalonica. The aim of this work, phytochemical screening and investigation of insecticidal activities of the examined different plant extracts and isolated compounds against C. cephalonica to development of new biological control of pests based on natural products.
Come face-to-face with flying snakes, shape-shifting octopuses, colour-changing chameleons, exploding fungi, and carnivorous plants in this spectacular guide to animals and every other living thing on Earth. Packed with over 1,500 incredible images and fascinating facts, The Animal Book captures all the wonders of the natural world in one amazing volume.
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Nature is an inexhaustible source of organic molecules many of which possess important biological activities. Plants are considered to be a repository of a large number of these molecules. The study of plants for their secondary metabolites will continue to be an important and relevant area of research activity globally for the discovery of novel compounds that may have therapeutic and biological properties that are beneficial to man existence. The book describes the isolation, purification, characterization and biological activities of secondary metabolites from a medicinal plant.
Create a thriving garden with the most comprehensive gardening encyclopedia available - now in its 4th edition. With exhaustive information on gardening techniques, horticultural developments, design principles, and recommended plants, it is the essential one-stop guide.
This research work was conducted jointly in the Pharmacy & Microbiology laboratory at BRAC University and Drug test laboratory of Center for Advance Research in Science, Dhaka University, Bangladesh. The objective of this research work to identify active compound which have antioxidant, antimicrobial, insecticidal activity.I do 12 month laboratory work regularly to successfully finish this research project. I also need extra 2 month at beginning of this research project to collect my targeted medicinal plants from various remote area of Bangladesh and for processing this plant materials.At last it was possible to complete this work because of some people they cordially help from first to last of this project.
Plants have always been an exemplary source of botanicals and many of the currently available products have been derived directly or indirectly from them. The ethnobotanical information reports about 800 plants that may possess insecticidal, antimicrobial and other biological properties. The present study has examined Aegle marmelos (Bael) tissues, chosen for their insect control uses, for insecticidal and insect antifeedant properties. One of the traditional medicinal plants, A. marmelos due to alkaloid, marmeline, lignan-glucosides and anthraquinone in the bark, heartwood and unripe fruits. The test insects are defoliators, Hyblaea puera and Spodoptera litura causing several damages to seedlings and younger plantations of teak. Using innovative methods, as well as classical bioassays, the researchers have studied feeding deterrency, larval growth inhibition, antifeedancy and larval mortality. Tissue especially A. marmelos seed oil has proven to be interesting source of bioactive compounds, there also exists a large scope for exploiting the species through the evaluation of the secondary metabolites for their biopesticidal properties.
Spatio-temporal expression of insecticidal gene (Cry1Ac& Cry2A) in pre existing lines of transgenic cotton was studied. Seasonal decline in expression of genes differed significantly among different cotton lines tested in the field conditions. The leaves of the Bt cotton plants were found to have the highest levels of toxin expression followed by squares, bolls, anthers and petals. Expression of the genes decreased consistently with the age of plants. Toxin expression in fruiting parts was not enough to confer full resistance against bollworms. The reduction in efficacy of transgenic cotton plants late in the season was attributed to reduction in promoter activity. For this purpose, Rubisco small subunit promoter was isolated from Gossypium arboreum that was further cloned upstream of Cry1Ac in expression vector pCAMBIA 1301. A local cotton cultivar was transformed with Cry1Ac driven by rbcS promoter. The same cotton cultivar was also transformed with Cry1Ac gene driven by 35SCaMV promoter to compare the expression pattern of insecticidal gene under two different promoters. The results showed that rbcS is an efficient promoter to drive Bt gene expression in cotton.
Full horticultural information for both familiar and rarely seen herbs from around the globe with details of their culinary, cosmetic and medicinal uses. Describes the extraordinary history of herbs and the plants that are revolutionising medicine. Safe and easy to use, with symbols highlighting potentially toxic or harmful plants. Endorsed by the RHS, the world's leading gardening charity.