共查询到20条相似文献,搜索用时 93 毫秒
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按照食品安全性毒理学评价程序,研究了"金花"菌对大小鼠的毒副作用。结果表明,"金花"菌对小鼠的经口LD50>10 000 mg/(kg.bw),属于实际无毒物;骨髓细胞微核试验和精子畸形试验结果均为阴性;30 d喂养大鼠生长发育良好,血液学指标和血液学生化指标均在正常范围内,而且解剖未见异常症状。 相似文献
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高顺 《农产品加工.学刊》2012,(6):64-68
以蜜蜂蜂蛹为原料,研究蜂蛹蛋白质酶解工艺,并对所得结果进行分析。结果表明,胰蛋白酶水解蜂蛹蛋白质最适条件为:酶解温度为60℃,酶用量为1.5%,酶解时间1.5 h,pH值为8.0,料水比为1∶8,最适水解条件下,水解液中的氨基氮质量浓度为1.526 mg/mL;中性蛋白酶水解蜂蛹蛋白质最适条件为:酶解温度为45℃,酶用量为2.0%,酶解时间为1 h,pH值为7.5,料水比为1∶6,最适水解条件下,水解液中的氨基氮质量浓度为2.068 mg/mL;最优水解酶是中性蛋白酶;双酶水解蜂蛹蛋白质的最适条件为:总酶量为2.0%,酶量比为1∶2,酶解温度50℃,酶解时间为2 h,最适水解条件下,水解液中的氨基氮质量浓度为1.889 mg/mL。双酶同时水解的效果不及中性蛋白酶。 相似文献
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高顺 《农产品加工.学刊》2012,(4)
以蜜蜂蜂蛹为原料, 研究蜂蛹蛋白质酶解工艺, 并对所得结果进行分析。 试验结果表明, 胰蛋白酶水解蜂蛹蛋白质最适条件为: 酶解温度为 60 ℃, 酶用量为 1.5%, 酶解时间 1.5 h, pH 值为 8.0, 料水比为 1∶8, 最适水解条件下, 水解液中的氨基氮含量为 1.526 mg/mL; 中性蛋白酶水解蜂蛹蛋白质最适条件为: 酶解温度为 45 ℃, 酶用量为 2.0%, 酶解时间为 1 h, pH 值为 7.5, 料水比为 1∶6, 最适水解条件下, 水解液中的氨基氮含量为 2.068 mg/mL;最优水解酶是中性蛋白酶; 双酶水解蜂蛹蛋白质的最适条件为: 总酶量为 2.0%, 酶量比为 1∶2, 酶解温度 50 ℃,酶解时间为 2 h, 最适水解条件下, 水解液中的氨基氮含量为 1.889 mg/mL。 双酶同时水解的效果不及中性蛋白酶。 相似文献
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超声波辅助浸提木枣多糖优化工艺的研究 总被引:2,自引:0,他引:2
通过正交试验,研究了超声波功率、提取温度、提取时间、料液比和提取液pH值对木枣多糖得率的影响。结果表明,各因素影响程度依次为:提取液pH值>料液比>提取时间>提取温度>超声波功率;得到最佳工艺参数为:超声波功率为200W,料液pH值为9,料液比为1∶12,温度为50℃,提取时间为15min。在此参数条件下,木枣多糖提取得率为1.81%。 相似文献
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银水苏种子发芽特性的研究 总被引:4,自引:3,他引:1
研究不同温度对不同年度采收的银水苏种子发芽特性的影响.对种子发芽率、种子发芽强度及胚根长度进行了测定分析.结果表明:不同年度采收的银水苏种子的发芽率存在极显著差异,其中2006年的种子比2005年的种子发芽率高且发芽速度快;2006年采收的种子胚根平均长度极显著高于2005年的,发芽质量好,且以25℃下长势最好;贮藏时间不同,种子萌发最适宜的温度不同,2006年采收的银水苏种子发芽最适温度为25℃,而2005年则最适温度为30℃.综合分析认为,在自然阴凉干燥贮藏条件下,银水苏种子不宜采后隔年播种;种子发芽适宜温度为20-30℃,最适温为25℃. 相似文献
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产油酵母菌的筛选及其摇瓶发酵条件的优化 总被引:2,自引:0,他引:2
从云杉树枝中筛选出1株高产油脂酵母菌Y-3,通过单因素试验对该菌发酵培养基的碳源、氮源、无机盐和培养条件(接种量、摇床转速、pH值、温度、时间等)进行了研究。结果表明,用酵母菌Y-3生产油脂的最适碳源和氮源分别为葡萄糖和硫酸铵,最适培养条件为:接种量为20%,初始pH值为6,培养温度为28℃,转速为160r/min,培养时间为6d。 相似文献
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介绍了运用冷冻干燥技术进行速溶蛋花汤的加工,研究了生产工艺、特点以及影响产品质量的主要因素。试验表明,采用冷冻干燥技术加工的速溶蛋花汤,具有营养丰富、风味独特、方便快捷等特点。 相似文献
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DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
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香蕉是热带亚热带发展中国家重要的粮食作物和碳水化合物来源。但近年来,香蕉生产受到严重的病虫危害。大多数香蕉栽培品种是三倍体,生长周期长,而且不孕。由于没有种子,给繁殖和育种带来一定的困难。遗传转化技术的发展为香蕉品种的改良提供了一种有效的手段。香蕉的遗传转化方法有电激法、基因枪法、农杆菌介导法等。农杆菌介导法的应用是香蕉品种改良的一个重大突破。香蕉遗传转化的外植体也发展到多种,有原生质体,胚性细胞悬浮系,分生组织,以及横切薄片等。近几年,随着分子生物学的发展,出现了转化效率更高,重复性更好的香蕉遗传转化技术。如农杆菌和基因枪结合法,离心辅助农杆菌介导法、真空渗透技术等。这些新技术新方法的出现,必将推动香蕉产业高速发展。 相似文献
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基于RS与GIS技术,利用景观生态学理论及景观格局指数对布尔津县土地利用现状进行定量分析。结果显示为:(1)布尔津县以草地、林地为主要景观类型,镶嵌着耕地、水域等景观类型。(2)四个分区(即高山区、丘陵区、平原区、荒漠区)的林地资源组成差异明显,耕地、居民、交通及工矿用地集中分布在丘陵区和平原区(3)从各项指数来看,高山区的多样性指数较低;平原区是受人文因素最多的区域,景观优势度低,各种土地利用类型比例差异不大,有利于生态可持续发展,但要合理的开发利用;荒漠区生态环境相对脆弱,要加强生态环境的保护与改善。通过该研究对布尔津县的土地利用现状作一个了解,为该县乃至整个地区的景观规划和可持续发展战略提供科学依据。 相似文献
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Efficiency of water use of early plantings of sunflower 总被引:4,自引:0,他引:4
M. Auxiliadora Soriano Francisco Orgaz Francisco J. Villalobos Elías Fereres 《European Journal of Agronomy》2004,21(4):465-476
Rain fed crop production in Mediterranean environments depends to a large extent on strategies that avoid the intense summer drought. Early plantings of sunflower have given consistently higher yields in such environments, but the basis for such yield increases has not been explored. We conducted two field experiments at Cordoba (Spain) to investigate the effects of an early and a late planting date on the components of water-limited crop productivity; namely, water use (T), water use efficiency (TE) and harvest index (HI) of sunflower. The results were generalized by simulating rain fed sunflower yields, under early (1 January) and late (15 March) plantings, for a 25-year period with the aid of a simulation model of the Ceres type (OILCROP-SUN) which has been validated in Cordoba. Experimental seed yields of early plantings in 1989 and 1996 were 2.0 and 3.0 t ha−1, while late plantings yields were 1.3 and 2.4 t ha−1, for the 2 years. Average simulated yields were 2.7 ± 1.1 and 1.9 ± 0.7 t ha−1 for early and late plantings, respectively. For the 2 years, T of early plantings was higher than that of late plantings, but the response of TE and HI to planting date was not the same in the two experiments. In the simulation exercise, T and TE of early plantings were consistently higher than those of late plantings, while there were no differences in the HI for the two planting dates. We conclude that early plantings of sunflower increase rain fed yields by increasing both T and TE, while the impact of planting date on HI very much depends on the crop water stress pattern, which is quite variable from year to year even in the predictable Mediterranean environment. 相似文献
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The cotyledon and hypocotyl of eight varieties of alfalfa( Medicago sativa L. )are used to study the effect of different cultivation procedures and genotypes on embryogenic callus and embryoid induction,plant development and transplant of alfalfa.The varieties of alfalfa with high embryoid induction rate and high differentiation rate are screened. A high frequency regeneration system for alfalfa tissue culture is established:which is benifical to the gene transformation of alfalfa. 相似文献
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Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method. The incipient yield pressure of the cylinder is gained by analyzing the experimental data, and then the limit of yielding is gained. The laboratorial method has a good reliability as the experimental value has a little error to the theory value. It has a definite engineering signification and theory value to research the mechanical capability of material and the disabled rule of high pressure vessel. 相似文献