英语摘要生物科学毕业论文

Abstract: Flammulina velutipes polysaccharides have many health benefits for human being, making it a magnificent value for development. Flammulina velutipe offcuts are low-cost and can be extracted with polysaccharide and activated carbon. This experiment in primary studies extracting polysaccharide and a process of preparation of activated carbon from flammulina velutipe cutoffs by using hot water. Through single-factor and SAS optimization design, an optimal condition of having polysaccharide is obtained: an extraction temperature of 100 ℃, a pH of , a solid-liquid ratio of 1:15 and a leaching period of h. The polysaccharide extraction yield acquired is mg/g which has times increase in comparison to the last optimization; With single factor optimization, the optimum condition of using microwave carbonization to prepare activated carbon is achieved: 50% phosphoric in activation for 8 hours, medium baking and carbonization for 5 min. the achieved activated carbon has a capacity of adsorbing methylene in mg/g, with an adsorption rate of . This study provides theoretical basis and technical supports for Flammulina velutipe cutoff resource : Flammulina velutipe cutoffs, Flammulina velutipe polysaccharide, activated carbon, extraction

Liu xx saline-alkali land sustainable utilization and improved technology abstract: saline-alkali land resources development and utilization has an important contribution to food the lack of water resources, climate change, make the development and utilization of saline-alkali work more article system in recent years are summarized the important progress was made in saline-alkali land sustainable utilization land improvement of saline-alkali land management, and promote agricultural efficient use is the guarantee food security, one of the important ways to promote agricultural sustainable agricultural science and technology progress and development of saline-alkali land access to continue to maintain and improve the agricultural saline soil area of about million hectares, million hectares arable land salinization, nearly 1/5 of the cultivated land salinization-alkalization, alkali-saline land use of the development of technology, especially in China, arid agriculture irrigation area of sustained and healthy development of rural economy, land management, ecological environment protection has extremely important practical improvement of saline-alkali water conservancy, agriculture and three aspects of chemical and biological technology, are reviewed in this paper saline-alkali improvement of technology, and put forward "foster strengths and circumvent weaknesses, comprehensive treatment" alkali-saline land.

Grafts the Chinese hawthorn isoflavone extraction process and the oxidation resistance research Biology and food science institute 2003 level of food sciences and project specialty Abstract: This article introduced in the Chinese hawthorn main nutrient content and the Chinese hawthorn the isoflavone function characteristic, respectively and grafts the Chinese hawthorn take the ordinary Chinese hawthorn as a raw material, has analyzed the different extraction method and the isoflavone extraction rate relations, and to grafted the Chinese hawthorn isoflavone the oxidation resistance function effect to carry on the analysis. Uses the mellow formulation, the water formulation and the ethyl acetate law three extraction method, separately and grafts the Chinese hawthorn juice extraction isoflavone to the ordinary Chinese hawthorn juice, through to the respective extraction rate's comparison and analysis knowing, uses the ethyl alcohol law to withdraw the isoflavone content to be high, and grafts in the Chinese hawthorn the isoflavone content slightly to be higher than the ordinary Chinese hawthorn isoflavone. After the single factor experiment analysis, seeks for the material fluid compared to, the ethyl alcohol density, the extraction temperature and the time and so on four extraction condition suitable parameter, thus had determined L9 (34) the orthogonal test each influencing factor's three levels, screen the material fluid compared to are 1:10, ethyl alcohol density are 85%, extraction temperature for 50℃, withdraw 1 hour for the extraction method optimum condition; Obtains the isoflavone density take the Kudzu root element as the standard through the ultraviolet spectrophotometric method, thus calculates obtains grafts the Chinese hawthorn juice isoflavone extraction rate is . Uses the color to respond and the paper chromatographic analysis law separately to withdraws the flavanone class material to carry on the appraisal. Through to joins the Chinese hawthorn juice, the sorbic acid potassium and does not have the antiseptic three kind of yogurt oxidation resistance abilities to carry on the experiment, finally indicated that the Chinese hawthorn juice yogurt's peroxide value is , is three product minimum values. In the Chinese hawthorn fruit includes the rich nutrient content and the pharmacology active constituent, is the depth the health foods which is liked the people, at present has become has the high research value and the development potential resources. Key words: Grafts the Chinese hawthorn; Isoflavone; Orthogonal test; Oxidation resistance

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