Now showing items 1-15 of 15
| Description: | National Centre for Aquatic Animal Health, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/2485 |
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| Dyuthi-T0668.pdf | (12.76Mb) |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/2182 |
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| Dyuthi-T0531.pdf | (3.004Mb) |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2057 |
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| Dyuthi-T0414.pdf | (4.384Mb) |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/2174 |
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| Dyuthi-T0525.pdf | (4.378Mb) |
| Abstract: | Instead of developing easily degradable, and low-priced insecticides, we are going after highly sophisticated chemicals. Here, an attempt is being made to develop safer formulations of insecticides of botanical origin. Different parts of the plants were chosen based on their use in countryside and villages The dried plant materials were extracted with petroleum ether, and were applied on Tribolium castaneum. The results were statistically analysed. The active principles from Croton tigilium and Leea sambucina, the most potential plants, were isolated using Column Chromatography, TLC, and Hydrolysis. The isolated principles were analysed spectroscopically ( UV-Vis., IR, NMR, and MS ) to identify their chemical nature. The active principles from Leea and Croton were identified as a cholisterate derivative and a phorbol derivative respectively. In order to ascertain the environmental combatibility of the principles, degradation by soil bacteria was studied. The isolated principles were made into three type of formulations using stabilizers .The formulations were applied on Snake gourd semilooper, Pulse beetle, and mosquito larvae. Also the biocidal activity of the formulations was studied. Both Leea derivative and Croton derivative could be formulated effectively and were effective against a variety of pests. They are eco-friendly, as there is no artificial chemicals involved. |
| Description: | School of Environmental Studies, Cochin University of Science And Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/2168 |
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| Dyuthi-T0521.pdf | (3.466Mb) |
| Abstract: | S. album L. is the source of highly priced and fragrant heartwood which on steam distillation yields on an average 57 per cent oil of high perfumery value. Global demand for sandalwood is about 5000-6000 tons/year and that of oil is 100 tons/year. Heartwood of sandal is estimated to fetch up to Rs. 3.7 million/ton and wood oil Rs.70,000-100,000/ kg in the international market. Sandal heartwood prices have increased from Rs. 365/ton in 1900 to Rs. 6.5 lakhs/ton in 1999-2000 and to Rs. 37 lakhs/ton in 2007. Substantial decline in sandalwood production has occurred from 3176 tons/year during 1960-‘ 65 to 1500 tons/year in 1997-98, and to 500 tons/year in 2007.Depletion of sandal resources is attributed to several factors, both natural and anthropogenic. Low seed setting, poor seed germination, seedling mortality, lack of haustorial connection with host plant roots, recurrent annual fires in natural sandal forests, lopping of trees for fodder, excessive grazing, hacking, encroachments, seedling diseases and spread of sandal spike disease are the major problems facing sandal. While these factors hinder sandal regeneration in forest areas, the situation is accelerated by human activities of chronic overexploitation and illicit felling.Deterioration of natural sandal populations due to illicit felling, encroachments and diseases has an adverse effect on genetic diversity of the species. The loss of genetic diversity has aggravated during recent years due to extensive logging, changing landuse patterns and poor natural regeneration. The consequent genetic erosion is of serious concern affecting tree improvement programme in sandal. Conservation as well as mass propagation are the two strategies to be given due importance. To initiate any conservation programme, precise knowledge of the factors influencing regeneration and survival of the species is essential. Hence, the present study was undertaken with the objective of investigating the autotrophic and parasitic phase of sandal seedlings growth, the effects of shade on morphology, chlorophyll concentration and chlorophyll fluorescence of sandal seedlings, genetic diversity in sandal seed stands using ISSR markers, and the diversity of fungal isolates causing sandal seedling wilt using RAPD markers. All these factors directly influence regeneration and survival of sandal seedlings in natural forests and plantations. |
| URI: | http://dyuthi.cusat.ac.in/purl/2344 |
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| Dyuthi-T0619.pdf | (3.814Mb) |
| Description: | School of environmental studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/purl/2172 |
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| Dyuthi-T0524.pdf | (3.318Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/2205 |
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| Dyuthi-T0563.pdf | (5.297Mb) |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2086 |
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| Dyuthi-T0452.pdf | (3.850Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/2660 |
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| Dyuthi-T0712.pdf | (10.27Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/2173 |
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| Dyuthi-T0522.pdf | (4.362Mb) |
| Abstract: | The problem investigated is on the haematological aspects of two freshwater pulmonate snails, Indoplanorbis exustus (Deshayes),and Lymnaea acuminata f.rufescens (Gray). An important aspect of the present investigation is to emphasize the utilization of freshwater organisms as models for research directed at understanding the basic biomedical problems that remain unresolved. Another aspect is to demonstrate how haemolymph can be treated as a tissue because of late, it has been shown that several parameters of blood can be taken as reliable indicators for diagnostic purposes, and also to monitor environmental pollution. The various haematological parameters studied are total haemocyte number,packed cell volume, haemoglobin, and inorganic as well organic constituents in three size groups of both the snail species. The effect of copper toxicity was measured in terms of total haemocyte count, and the activity pattern of selected phosphatases and transaminases.The study concluded that enzyme activity levels can be taken as reliable indicators to monitor pollution. Age is a factor that determines several of the physiological, biochemical and metabolic activities. This study also indicates that haemolymph can be taken as an organ system to study the various changes taking place at organ systems levels. |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2055 |
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| Dyuthi-T0461.pdf | (3.956Mb) |
| Abstract: | The present study is an attempt to understand the physiological responses of a freshwater gastropod, in terms of haematological parameters, in normal conditions as well as in various natural and man made altered conditions of the environment.Pila virens, a freshwater prosobranch,commonly found in paddy fields, ponds, and streams of Kerala is selected as the test animal for the present investigation. Various haemolymph constituents such as total carbohydrate, glycogen, total protein, total lipid, urea,ammonia,sodium,potasium, calcium, and chloride which are directly involved in the control and maintenance of different physiological systems, were analysed in the present study. Selected haematological parameters like total haemocyte number, and packed cell volume were also determined. Besides , the activity pattern of selected haemolymph enzymes such as acid phosphatase (ACP), alkaline phosphatase (ALP),Glutamate-oxaloacetate transaminase (GOT), and glutamate-pyruvate transaminase (GPT), all having diagnostic value in terms of internal defence system and metabolism of the organism, were also studied. |
| Description: | School of Environmental Studies,Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/2059 |
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| Dyuthi-T0462.pdf | (4.851Mb) |
| URI: | http://dyuthi.cusat.ac.in/purl/2300 |
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| Dyuthi-T0592.pdf | (6.497Mb) |
| Description: | School of Environmental Studies, Cochin University of Science and Technology |
| URI: | http://dyuthi.cusat.ac.in/xmlui/purl/1958 |
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| Dyuthi-T0487.pdf | (2.820Mb) |
Now showing items 1-15 of 15
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