Study on Cultural Technologies and Salt-resistance of Nitraria sibirica in Coastal Areas with Serious Salt-affected Soil

In this research, five Nitraria sibirica provenances such as Dayilu were selected to do experiment of salt-resistance, combining fixed plots test with typical plot investigation, measuring survival rate and growth as main indicators. The experiments of main cultural technology were done on Nitraria sibirica in 4 types of site preparation, 3 types of planting, 3 designs for planting density. The Nitraria sibirica experiments for the effects of curbing salt and improving soil were done by testing soil nutrients, salt content, soil physical properties as focal points in typical site of 3-4 years woods. The experiment results showed that the Nitraria sibirica could survive well with soil salt content of 0.6%, and that survival rate declined distinctively as soil salt content exceeded 0.8%. However, high soil salt content did not influence growth in the year of planting. There were obvious differences in salt-tolerance among Nitraria sibirica provenances; Dayilu was the best on salt-tolerance, the other 4 pro     

银川地区羊肝中阿苯达唑(丙硫苯咪唑)残留情况的调查

阿苯达唑又称丙硫苯咪唑或丙硫咪唑，有时又称抗蠕敏，是目前国内常用的驱虫效果好、范围广、毒性较低的兽用驱虫药。随着家庭舍饲养羊规模的不断扩大，饲养者为了减少因寄生虫导致的死亡并增加育肥效果，常把阿苯达唑作为育肥前预防驱虫或寄生虫病治疗的首选药，出现了滥用或超剂量使用的现     

沙棘在西伯利亚面临的问题与解决办法

针对西伯利亚沙棘繁育发展中的问题，尤其是20世纪30年代从郭尔诺－阿尔泰地区引入的沙棘客体连续出现的品种变化，混杂和应淘汰等问题，指出：这里的沙棘，不但从野生发育形态方面出现诱变，而且目前在西伯利亚仅有20个左右繁育着的品种，在展示着原品种较为完备的特性；能按时结果；树冠低矮；有刺；浆果稳定。总的看，几乎在整个俄罗斯20个区域内传播着，占俄罗斯栽植品种的1／3。当然，每个品种都有有一个生物经济的所有制和栽植前的宣传发布与公认问题，解决这些问题，就能在各种不同地区加强推广和普及。但到目前为止，西伯利亚栽植繁育着的沙棘，还只是不多的原有一些品种，使用的还是过去认为效率高的多样化方法。     

催化性抗体

抗体能否用作酶呢?这二类蛋白功能不同,酶以催化性为特征,能加速化学反应,自身并不耗损,抗体则在识别物质上无与伦此。但是酶和抗体发挥作用的方式是相同的,都结合到别的分子上。酶的表面有一裂隙,在化学转换过程中将反应物结合于其中。抗体有与侵入机体的外来生物分子结合的特异部位。免疫系统可造出能与约一亿个抗原决定簇结合的抗体,每种抗体能与一特定的外来物质相结合,免疫系统实际上抵御     

Development of SSR Markers towards Genetic Mapping in Cotton(Gossypium hirsutum L. )

Availability of informative molecular markers isa prerequisite for genetic mapping and marker-assisted selection projects.Micro-satellites orSimple Sequence Repeat(SSR)markers arePCR-based and currently the most widely usedmarker system in the plant molecular geneticscommunity due to their high degree ofpolymorphism,random distribution throughoutthe genome and their suitability for highthroughput genotyping formats.Despite itsglobal economic importance,cotton has slower     

氰胺对猕猴桃新梢花量及着花部位的影响

氰胺应用在许多植物上,以克服冬季低温不足。新西兰、以色列、南非和智利等国猕猴桃商品栽培中也广泛应用氰胺,其主要作用是提高萌芽率,且萌芽整齐,增加单位花枝上的花量。不过,应用的时间和浓度是相当关键的。     

高湿度引起栽培番茄果实的蒂腐病

蒂腐病(BER脐腐病)是一种与番茄果实内钙失调有关的病害,在田间或温室中引起严重的经济损失。这种失调通过果实顶端部分的坏死很容易鉴别,它与组织中Ca的浓度较低有关。当水移动到果实暂时停止或植株受旱到一定程度其蒸腾量减少时,会发生损伤。Ca基本上是随着蒸腾流而运送到整个植株的。因