共查询到20条相似文献，搜索用时 500 毫秒
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栗蚕是节肢动物门、昆虫纲、鳞翅目、大蚕蛾科、柞蚕属完全变态的野生吐丝经济昆虫，俗称灯笼蚕，广泛分布于我国“三北”和中南等地区，辽宁占据主产区的首位。栗蚕丝是价格昂贵的天然纤维，具有独特的荧光闪烁性，被用作多种防伪标志和高档服饰品，其价格是柞蚕丝的10倍。栗蚕蛹不仅是高蛋白、低脂肪的优质保健食品，而且含有若干奇特药物成分，可以医治多种疾病，其价格是柞蚕蛹的6倍。由于国内外市场需求量剧增，售价不断上涨，因此掠夺性过量采收栗蚕茧的现象日趋严重，几乎使其处于濒临灭绝的危险境地。 相似文献
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分别采用TC-100加20％胎牛血清做为细胞原代培养基，在27℃，pH6．2—6．4的条件下，对栗蚕（Dicly-opoeajaponica）蛹卵巢组织进行体外培养，细胞贴壁较好，原代培养细胞能够存活两个月之久。细胞形态不一，培养20d后。细胞产生聚集分化现象，每隔7d换液1次。结果表明：TC-100培养基对栗蚕蛹卵巢原代培养细胞来说是比较理想的培养基。 相似文献
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<正> 蚕业副产品的加工利用,涉及到轻工、医药、外贸等多种学科和部门,在我国南方各省已越来越多地受到人们的重视,而在我省利用的还较少。本文着重介绍在蚕桑副产品综合利用中已投产或适宜蚕农和乡镇企业生产的项目,希能引起各方面的注意。一、番蛹的综合利用蚕蛹是一种高蛋白物质,含有20种氨基酸,包括人体必需的8种氨基酸和人类通常缺乏的色氨酸、赖氨酸、蛋氨酸三种氨基酸。且含量均衡,鲜蛹中蛋白质含量占总量的14—15％,100公斤鲜蛹相当85公斤瘦猪肉;96公斤鸡蛋,109公斤鲫鱼的蛋白质含量。同时蚕蛹中还含有丰富的脂肪,干蛹中脂肪含量占25％,100公斤干蛹相当32公斤猪肉,83公斤花生米,174公斤黄豆的脂肪含量。蚕蛹不仅是家禽、家畜、塘鱼的精饲料和人类的高级营养晶,也是制取医药的理想原料。 相似文献
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栗蚕是柞蚕属完全变态的野生吐丝经济昆虫，俗称灯笼蚕，广泛分布于我国“三北”地区和中南地区，它是我国的重要特产之一，目前尚处于野生状态。栗蚕丝是价格昂贵的天然纤维，具有独特的荧光闪烁性，被用做多种防伪标志和高档服饰品，其价格是柞蚕丝的10倍。栗蚕蛹不仅是高蛋白、低脂肪的优质保健食品，而且含有许多奇特药物成分， 相似文献
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蚕蛹资源的开发和利用 总被引：14，自引：0，他引：14
蚕蛹（silkwormpupa）是家蚕（BombyxmoriL．）生命周期中的一个发育阶段，它含有蛹油、蛹蛋白、蛹核酸和几丁质等成分。公元前１世纪中国的《汜胜之书》记载了用蛹汁做肥料的方法。２０世纪初，日本对蚕蛹做饲料的营养价值进行了较深入的研究，用蚕蛹作原料成功制造了酱油、味精等调味品。中国从５０年代起对蚕蛹综合利用进行了较系统的研究并取得了许多成果，已经取得很好的经济效益和社会效益。１．蚕蛹油的综合利用蚕蛹中的脂肪占蚕蛹鲜物的９％～１０％或占干物２８％～３０％，含有大量不饱和脂肪酸甘油酯。蚕蛹油能水解成各种脂肪酸… 相似文献
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为蚕蛹虫草的规模化生产提供技术支撑,以野生北冬虫夏草菌种为接种材料,以家养的活体桑蚕蛹为寄主,研究了蚕蛹虫草菌种制备、接种、发菌至出草的人工培养条件。结果表明:接种前削去蚕茧后放置2d,可有效去除病蛹及生命体征弱的蚕蛹,能在源头上控制污染;接种的蚕蛹虫草液体菌丝的活度越高,接种后的蚕蛹僵化越快;接种部位选择蚕蛹翼翅正后方与第3环节交叉点,易操作且蚕蛹体液和菌液不易溢出;菌丝完成营养生长后,给予300lx光照和10℃温差刺激(300lx光照22℃培养14h,黑暗13℃培养10h为周期)培养7~10d能有效促进蚕蛹虫草菌丝转色和子座的形成,在此条件下出草率达98.5%,虫草平均鲜重达1.25g。 相似文献
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蚕蛹是蚕茧抽丝后剩下的副产品。过去大部分被用作饲料和肥料,少量被人食用,经济价值很低。其实,蚕蛹是很宝贵的资源。在干的蚕蛹中,含有25%～29%的蚕蛹油,以及51%～59%的蛋白质。蛋白质中则含有人体所必需的18种氨基酸,还含有能延缓人体衰老的维生素 E。蚕蛹综合利用的途径很多,主要有: 相似文献
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引：63，自引：0，他引：63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites. 相似文献
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Mansfield E 《Science (New York, N.Y.)》1980,209(4461):1091-1093
R & D, through its effects on the rate of productivity increase, can significantly restrain the rate of inflation in the medium and long run. High rates of inflation damage the workings of the price system and impair the efficiency of practically all economic activities, including R & D. Findings suggest that the percentage increase between 1969 and 1979, in total real R & D expenditures, has been exaggerated due to the inadequacy of the gross national product deflator as applied to R & D. 相似文献
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Fiber, food, fuel, and fungal symbionts 总被引：2，自引：0，他引：2
Virtually all plants of economic importance form mycorrhizae. These absorbing organs of higher plants result from a symbiotic union of beneficial soil fungi and feeder roots. In forestry, the manipulation of fungal symbionts ecologically adapted to the planting site can increase survival and growth of forest trees, particularly on adverse sites. Vesicular-arbuscular mycorrhizae, which occur not only on many trees but also on most cultivated crops, are undoubtedly more important to world food crops. Imperatives for mycorrhizal research in forestry and agriculture are (i) the development of mass inoculum of mycorrhizal fungi, (ii) the interdisciplinary coordination with soil management, plant breeding, cultivation practices, and pest control to ensure maximum survival and development of fungal symbionts in the soil, and (iii) the institution of nursery and field tests to determine the circumstances in which mycorrhizae benefit plant growth in forestry and agri-ecosystems. 相似文献
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The global distribution of fluorocarbon-12 and fluorocarbon-11 is used to establish a relatively fast interhemispheric exchange rate of 1 to 1.2 years. Atmospheric residence times of 65 to 70 years for fluorocarbon-12 and 40 to 45 years for fluorocarbon-l1 best fit the observational data. These residence times rule out the possibility of any significant missing sinks that may prevent these fluorocarbons from entering the stratosphere. Atmospheric measurements of methyl chloroform support an 8-to 10-year residence time and suggest global average hydroxyl radical (HO) concentrations of 3 x 10(5) to 4 x 10(5) molecules per cubic centimeter. These are a factor of 5 lower than predicted by models. Additionally, methyl chloroform global distribution supports Southern Hemispheric HO levels that are a factor of 1.5 or more larger than the Northern Hemispheric values. The long residence time and the rapid growth of methyl chloroform cause it to be a potentially significant depleter of stratospheric ozone. The oceanic sink for atmospheric carbon tetrachloride is about half as important as the stratospheric sink. A major source of methyl chloride (3 x 10(12)grams per year), sufficient to account for nearly all the atmospheric methyl chloride, has been identified in the ocean. 相似文献
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