Methods and Techniques to Enhance the Production of Secondary Metabolites in Hairy Roots     

ZHANG Guang-qiu  WANG Bo-chu  DUAN Chuan-ren  HU Kai 《保鲜与加工》2005,(6):121-124142

Hairy roots culture is a new means to gain the plant secondary metabolites. How to enhance the production of secondary metabolites in hairy roots becomes a new hotspot recently. The authors summarize recent trends and results about the increase of the production of secondary metabolites in medicinal plant hairy roots. The change of culture conditions and the application of biotechnologies can enhance the production of secondary metabolites in hairy roots.  相似文献   

An EOQ Model at Random when Average Demand Is a Linear Increasing Function     

LUO Bing  YANG Xiu Tai  XIONG Zhong Kai 《保鲜与加工》2002,(5):131-135

For certain types of inventory, the ordering cycle and demand may be random variants, which satisfy certain types distribution. The classical EOQ model usually neglects the fact. Based on the constant demand, under the hypothesis that the ordering cycle is a random variant which satisfies exponent distribution, average demand is a linear increasing function, this paper considers the effects of the time-value of capital and inflation on replenishment strategy of inventory system. Loosening the condition of basic economic order quantity model under deterministic state, the total cost function of the model is provided. The optimum order quantity and cycle are obtained. The application range of EOQ model under the constant demand is widened. The theoretical evidence is provided for the inventory system to make management decision.  相似文献   

The Application of Relevant Homology in the Unified Representation of Electromagnetic Potentials and Gauge Transformation     

Yun Zhengqing  Tan Bangding 《保鲜与加工》1995,(1):45-50

Electromagnetic potentials and gauge transformation are derived for non-cloSedexterior differential forms with the help of relevant homology.Since de Rham ccahomology is sure-ly a relavant homology. potentials for both closed and non-closed forms and the gauge transforma-tion ean be unified in terms of relavent homology.  相似文献   

The Unified Representation of Interface Conditionsof Electromagnetic Quantities Using Exterior Differential Forms     

Yun Zhengqing  Tan Bangding 《保鲜与加工》1994,(3):25-31

A continuity condition of p-forms across a p-dimensional submanifold isderived.The,various interface conditions of electromagnetic quantities are obtained through theapplication of the continuity condition to Minkowski manifold of space-time.  相似文献   

Mathematical Model of Methane Transport in Coal Seam     

Zhang Guangyang  Tan Xueshu  Xian Xuefu  Du Yungui 《保鲜与加工》1994,(4):53-57

This paper studies the effects of ground stress and ground electrical field onmethane transpont in coal seam. A gas seepage equation is set up based on the principles of seepagetheory,which takes the ground stress and ground electrical field into considerationz  相似文献   

观赏羽衣甘蓝的离体繁殖   总被引：5，自引：0，他引：5  

王怀名  杜广岑 《华北农学报》1995,10(1):64-69

以花蕾为外植体，离体繁殖羽衣甘蓝８个杂各一代材料。培养基为（ｍｇ／Ｌ）：ＭＳ＋ＢＡ１－２＋ＮＡＡ０．１－０．２＋ＩＡＡ０．５＋（或不加）ＧＡ３０．３＋３％蔗糖。平均１８％－６７％的接咎花蕾产生不定芽；药有３０％的不定芽发育成完整植物。培养物的严重褐化和再生植物的普遍玻璃质化是影响植株成活的主要因素。培养基中加入活性炭和青霉素，并给以强光照射，可提高植株成活率。  相似文献   

有机无机肥料对小麦的肥效及其交互作用   总被引：4，自引：0，他引：4  

黄德明  张廷顺 《华北农学报》1993,8(3):69-75

在京郊大同肥力水平土壤上,有机肥和化肥配合施用小麦增产量最高,其增量在中、高肥力试验点上大于低肥力试验点.有机肥和化肥配合施用时的增产作用是它们各自增产效应之和,它们之间的交互效应不显著.在高肥力土壤上甚至有负的交互效应,即配台施用时的增产量小于分施时各自增产量之和.根据肥料试验,本文提出了京郊不同肥力水平土壤上小麦有机无机肥料配合施用量,并发现在低肥力土壤上随着有机肥的施用,化肥氮的用量增加,化肥磷用量可减少;在高肥力土壤上随有机肥的施用,化肥氮用量减少,化肥磷用量增加;在中等肥力土壤上配合有机肥的施用,氮磷化肥用量均个应减少,应略为增加.  相似文献   

内毒素对肠黏膜微血管内皮细胞内分泌一氧化氮和内皮素的影响   总被引：1，自引：1，他引：1  

王新  谭建华  刘金玲  韦旭斌  穆祥 《中国农学通报》2006,22(1):4-4

目的是研究内毒素（lipopolysaccharide; LPS）导致肠黏膜微血管内皮细胞损伤的作用机制。将所培养的肠黏膜微血管内皮细胞分为空白对照组和LPS组，每组按时间分为4个亚组：3h、6h、9h、12h。空白对照组加维持培养液，LPS组加1μg/ml LPS培养液，在CO2培养箱内静置培养。结果表明，一氧化氮（NO）分泌明显升高，3h后达到高峰，随后逐渐降低，而内皮素（endothelin; ET）分泌急剧升高，9h后达到高峰，随后又开始逐渐降低，但一直保持在较高的水平。所以引起了NO和ET的升高可能是LPS导致肠黏膜微血管内皮细胞的损伤机制。  相似文献   

黎榆A繁殖母本有效穗和结实率与产量的关系   总被引：5，自引：0，他引：5  

黄大军  谭亚玲  李炎渊  顾晓明 《种子》2003,(1):14-15

繁殖田母本有效穗和结实率是影响产量的主要因素。通过对10个不同父母本栽插行比的分析结果表明：黎榆A繁殖产量以父母本栽插行比为2：18最高，达292．09kg/667m^2。增加有效穗对于增产的效应要比增加结实率大；有效穗与产量，结实率与产量的偏相关系数均呈正相关，且有效穗与产量的相关达显著水平，多元回归方程为：y-155.6283 4.8660x 0.2342x2.  相似文献   

水稻田间育秧精密播种机设计与试验     

马旭  邝健霞  齐龙  梁仲维  谭永炘  江立凯 《农业机械学报》2015,46(7):31-37

为提高田间育秧播种机的播种合格率和播种稳定均匀性,设计了一种适用于南方水稻田间育秧的精密播种机。在深入分析螺旋勺轮式播种器的播种原理,以及播种器行走控制系统的基础上,采用正交试验方法,研究了螺旋勺轮的凹槽深度、螺旋升角、播种器行走速度对播种合格率和空穴率的影响规律,得出杂交稻播种合格率和空穴率影响因素的最佳参数组合:凹槽深度h为3 mm、螺旋升角α为81.73°、播种器行走速度v为0.35 m/s。试验表明,采用闭环控制系统后的播种机播种杂交稻2~6粒/格合格率由87.14%提升到93.21%,常规稻3~8粒/格的播种合格率为92.14%,播种性能满足常规稻和杂交稻精密播种育秧的技术要求。  相似文献