菠萝蜜种子淀粉制备香草兰微胶囊的工艺研究     

张彦军  朱红梅  田建文  徐飞  初众 《热带作物学报》2017,38(6):1127-1133

以菠萝蜜种子淀粉为壁材,采用饱和水溶液法制备香草兰精油微胶囊,以包埋产率为指标,采用响应面分析法对微胶囊的包埋条件进行优化探讨。结果表明:5个单因素中,影响最显著的因素为壁芯材比例、包埋温度和包埋时间。响应面优化得到香草兰精油微胶囊的最佳工艺条件为壁芯材比例为7.5∶1;包埋时间72 min;包埋温度54℃,此条件下的包埋产率为(95.46±0.2)%,包埋率为(76.35±0.6)%,载油量为(27.73±0.3)%。试验证明,此条件结果与模型预测值相吻合,此工艺条件可为菠萝蜜种子淀粉包埋香草兰精油微胶囊工艺提供理论依据。  相似文献   

Effect of Heat Stress on Grain Growth, Starch Synthesis and Protein Synthesis in Grains of Wheat (Triticum aestivum L.) Varieties Differing in Grain Weight Stability     

C. Viswanathan  & Renu Khanna-Chopra 《Journal of Agronomy and Crop Science》2001,186(1):1-7

The effect of heat stress on the components of grain weight was analysed in wheat ( Triticum aestivum L.) varieties differing in grain weight stability. The wheat varieties PBW154, Sonalika and Hindi62 were raised in the field (New Delhi, India; 77°12' E, 28°40' N, 228.6 m a.s.l.) at three dates of sowing: 19 November 1992 (DOS I), 14 December 1992 (DOS II) and 18 January 1993 (DOS III). The late-sown crop (DOS III) experienced 6–8 °C warmer temperatures during grain development than the crop sown at the normal time (DOS I). The heat susceptibility index (S) revealed that grain weight was less susceptible to heat in Sonalika and PBW154 than in Hindi62. Heat stress reduced both the grain growth duration (GGD) and the grain growth rate (GGR). The grain weight reduction in PBW154 and Sonalika was mainly due to a reduction in GGR, while that of Hindi62 was due to a reduction in GGD. In vivo studies on starch and protein synthesis in excised endosperm at 15, 25 and 35 °C revealed that both processes were more thermotolerant in Hindi62 than in PBW154. The grain starch content was stable in Hindi62 while that in PBW154 was significantly reduced under heat stress. The grain nitrogen content at maturity increased in both varieties under heat stress. It was concluded that the heat susceptibility of grain weight in Hindi62 was mainly due to a reduction in GGD, although GGR, starch and protein synthesis were more thermotolerant in developing grains of Hindi62 than in those of PBW154.  相似文献   

导入AGPase基因的转基因可育水稻及其经济性状的研究   总被引：8，自引：0，他引：8  

宋敏  李援亚  张云孙 《华北农学报》2001,16(4):11-14

以农杆菌介导法将淀粉合成关键酶AGPase(腺嘌呤二磷酸葡萄糖焦磷酸化酶）基因导入云南地方优质水稻合系35，38，39，41，42中，获得了大量的可育转基因植株。PCR扩增检测，外源基因已稳定整合进水稻基因组中。大量的农艺性状及淀粉含量研究表明，转基因水稻种子的千粒重比对照明显提高，但总淀粉含量没有显著变化。  相似文献   

二甲硝咪唑盐的合成研究     

刘永琼  余红霞  邹军  李华枝 《中国兽药杂志》2001,35(4):23-25

本文报道以简便易行的方法合成水溶性二甲硝咪唑盐，收率高达95％以上，具工业化应用价值。  相似文献   

春小麦蛋白质、脂肪、淀粉含量间的相关与回归分析   总被引：2，自引：0，他引：2  

孙继堂  司爱香 《甘肃农业大学学报》1989,(4):44-56

本文通过对20个春小麦品种(或品系)蛋白质、脂肪、淀粉百分含量间的相关、回归、协方差分析,表明蛋白质百分含量与淀粉百分含量间为极显著的负相关;脂肪百分含量与淀粉百分含量间为极显著的负相关;蛋白质百分含量与脂肪百分含量间为极显著的正相关。并建立了淀粉、脂肪、蛋白质百分含量间的回归方程。在同一试验条件下,各品种(或品系)蛋白质、脂肪、淀粉百分含量变异系数的大小,在一定程度上反映出各品种在品质性状上的纯合程度。变异系数愈小,表明纯合程度愈高;变异系数愈大,表明纯合程度愈低。因此,在那些变异系数较大的品种(或品系)中,可选出表型性状与原品种(或品系)基本相似,而在品质性状上却有较大提高的优质新品系。  相似文献   

Changes in Endopeptidase Activity during Photosynthetic Declination in Rice Leaf     

DENG Zhi-rui ZHANG Rong-xian 《水稻科学》2004,11(1)

Two japonica rice varieties, Wuyujing 3 and 97-7, were used to study the changes in contents of soluble protein, free amino acids and endopeptidase activity during photosynthetic declination. The content of soluble protein in flag leaf of cv.Wuyujing 3 was higher than that of cv. 97-7, but decreased rapidly in Wuyujing 3. Free amino acids in flag leaf and the thirteenth leaf of Wuyujing 3 started to increase 10 days before the turning point of photosynthetic declination (TPPD), while it occurred just 1-2 days before TPPD in the flag leaf and the thirteenth leaf of 97-7. During reversible phase of photosynthetic declination,endopeptidase activity remained at a low level and increased slightly only in the later part of this phase. Then it rose up rapidly at irreversible decline phase and reached a very high level. For Wuyujing 3, the change in endopeptidase activity in the thirteenth leaf was parallel to that in flag leaf. However, for 97-7, the rapid increase of endopeptidase activity in the thirteenth leaf started later than that of flag leaf. The results implied that the rate of protein breakdown and conversion to transportable nitrogen in leaves of 97-7 was slower than that in leaves of Wuyujing 3 during photosynthetic declination and it led to relatively lower seed setting rate and fully filling grains rate in 97-7. This may be one of the important reasons why 97-7 could not bring the high yield potentiality into play and the findings may be taken into consideration while breeding for high potential varieties in future.  相似文献   

Physiological Basis of Irrigation Scheduling for Seed Production in Egyptian Clover Syn. Berseem (Trifolium alexandrinum L.) Crop     

N. C. Sinha  R. P. Singh 《Journal of Agronomy and Crop Science》1986,156(4):246-252

A field experiment was conducted to find out the critical physiological stages of irrigation schedules inducing better growth, physiological efficiency and seed yield potential of berseem ( Trifolium alexandrinum L., Var. S-99-1). For this purpose eight irrigation treatments were made comprised of four treatments of three irrigation (W₁, W₂, W₃ and W₄), three treatments of four irrigation (W₅, W₇ and W₈) and one treatment of five irrigation (W₆) at various physiological stages i. e. regeneration, flower initiation, full bloom, seed initiation and advance seed development stage.
Thus based on the experimental results the physiological role of watering in berseem seed production could be discussed as:
With-holding of irrigation either at regeneration or at full bloom stage developed potential water stress in plants as indicated by high proline content of irrigation treatments — W₄, W₁ and W₇; and further brought out disturbance on the formation of carotene, synthesis of water soluble sugar and translocation of sugar towards reproductive organs during grain development stage. These stresses adversely affected the plant growth and flowering behaviour. The irrigation at seed initiation stage increased the seed yield. Continuous irrigation did not appear to be useful. Thus it can be concluded that irrigation at three critical physiological stages i. e. regeneration, full bloom and seed initiation was found to be essential for obtaining potential seed yield of berseem.  相似文献   

测定石膏性盐渍土水溶性盐的适宜水土比     

戴祥韵  周斐德 《中国农业大学学报》1990,(1):55-58

土壤水溶性盐的含量与组成随制备浸出液的水土比例不同而异,对含石膏的盐渍土测定结果的影响尤为显著。为了正确反映田间水溶性盐的实际状况,作者进行了三种不同水土比例制备浸出液的对比试验。结果表明,适宜水土比为1:1,其测出的盐分含量与饱和泥浆法按近,且操作简便、快速,在我国一般土化分析实验室均可采用。  相似文献   

Dielectric properties of surimi at 915 MHz and 2450 MHz as affected by temperature, salt and starch     

Weijie  MAO  Manabu  WATANABE  Noboru  SAKAI 《Fisheries Science》2003,69(5):1042-1047

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一氧化氮合酶与寄生虫感染   总被引：4，自引：0，他引：4  

杨四军  姚茂忠  姚宝安  郭定宗 《动物医学进展》2003,24(1):26-28

一氧化氮(NO)在体内由L-精氨酸在一氧化氮合成酶(NOS)的催化下生成。它是一种重要的信使分子,参与血管、气道平滑肌的调节,神经递质的传递,细胞杀伤,肿瘤细胞的溶解及内分泌激素的释放过程,与许多疾病的发生、发展密切相关;既在机体多个系统多种细胞中具有广泛的生理功能,又可能参与多种疾病的发生过程。寄生虫感染时,动物机体内由其诱发产生各种细胞因子。细胞因子激发一氧化氮合酶基因,其转录产生iNOS(induciblenitricoxidesynthase)mRNA,由iNOSmRNA指导一氧化氮合酶(iNOS)生成。iNOS以精氨酸为底物合成NO。本文就NOS的结构、生成和NO对寄生虫的作用以及影响NO抗寄生虫感染的因素作了综述。  相似文献