繁殖

Experiments were conducted to measure the impact of biofouling on the growth and reproduction of pearl oyster Pinctada martensii.

主要研究定期清除污损生物的合浦珠母贝与不清除污损生物的合浦珠母贝在生长及繁殖上的差异，用以说明污损生物对合浦珠母贝的生长及繁殖的影响。

The market benefit is obvious and the demand is increased day by day.In our study, the effects of different plants growth substances on induction of Pelargonium graveolens callus and organ genesis were investigated by tissue culture and rapid-reproducing technology.

本文以驱蚊香草幼嫩叶片为外植体，诱导筛选愈伤组织，讨论了不同光照对愈伤组织增殖的影响，并对其快速繁殖作了初步探讨，为驱蚊香草的快速繁殖积累资料。

D in 1996. Since Penna sexual and asexual propagation model was introduced, the widely applied to explain the reality of the phenomenon and explain the deeper meaning behind the phenomenon immediately, and is widely development and application.

自Penna无性繁殖和有性繁殖模型被提出后，立即被广泛应用到解释现实中的现象和阐释现象背后的深层意义中，得到了广泛的发展和应用。

Utilizing Chinese philter herbs as feed additives, sow reproductive performance was improved. Eighty sows were divided into one comparison-group and three experimentation-groups, and two propagate-cycles were observed.

为进一步探明中草药添加剂对提高母猪繁殖性能的确切效果，将80头经产母猪均分成对照组和各用1个试验药方的3个试验组，进行了2个繁殖周期的试验。

Plateau pika, as a small endemic mammal, lives in Qinghai-Xizang Plateau and shows typical characteristics of sea...

自然种群季节性繁殖神经内分泌调控的研究是繁殖调控研究的活跃领域。

Our results show that active pollination is not essential for the reproduction of the pollinator, but does improve its reproductive success.

研究结果说明传粉榕小蜂的主动传粉对其繁殖不是必需的，但是主动传粉能增加其繁殖成功的几率。

The frequency of genotype AA in prolific group and normal group were lower than low prolificacy group. It can be inferred that gene B made positive effect in prolificacy in Jizhong-goat, and gene A made negative effect in prolificacy.

高产群和普通群体的从基因型频率都比相应的低产群要低，可推测等位基因B对冀中山羊高繁殖性能有正向作用，而A基因对冀中山羊的繁殖性能有负向效应。

The relationship between the proterozoic Era and explosive evolution of the life on the Cambrian period was preliminary explored by an Ecological and Evolutionary approach in this paper.

距今38亿年前地球最早生命诞生以来，至元古代早期第一个真核细胞开始出现；从无性分裂或出芽繁殖的原核生物到有性繁殖的真核单细胞生物以及从单细胞的原生动物到真核多细胞的后生动物的进化，无疑是生命进化过程中非常重要的事件。

The spore germination and gametophyte development of 21 ferns are studied. It indicates that :① the development period of prothallium and young sporophyte of the same species is different due to seeding time of spores;② the optimal temperatures of spores germination and gametophyte development of 21 ferns are about 15 -24 ℃;③ the rate of spore germination of rare ferns is much lower than the ferns which occur large populations in nature;④ the treatment with GA 3 can accelerate the germination of the spores;⑤ the prothallium changes from large to small, green to yellow when young sporophyte comes out. The prothalliums of all 21 ferns die away after the appear of the 3rd leaf of sporophytes;⑥ shapes of the 1st and 2nd leaves of the young sporophyte are different from those emerged later;⑦ spores cultured in dark can not germinate;⑧ a prothallium can develop only one young sporophyte though it has many archegoniums, and the spore propagation with leaf mould substrate is an economical method.

摘 要：以腐叶土为培养基质，对 21 种蕨类植物进行了孢子萌发和原叶体发育的研究，结果表明：①不同时期播种的同种蕨类的孢子，发育出原叶体和幼孢子体所历经的时间长短不同；②孢子萌发和配子体生长发育的适宜温度约为 15 ～ 24 ℃；③稀有蕨类的孢子萌发率低，而在野外能形成较大种群的蕨类的孢子萌发率高；④用 GA 3 处理孢子可以促进萌发；⑤当原叶体上长出幼孢子体时，原叶体由大变小，由绿变黄， 21 种蕨类的原叶体都在幼孢子体上长出第 3 片叶时消失；⑥幼孢子体上长出的第 1 、 2 片叶在形态上与以后长出的叶不同；⑦孢子萌发需要光；⑧ 1 片原叶体尽管有多个颈卵器，但仅发育出 1 株幼孢子体；⑨利用腐叶土进行蕨类孢子繁殖是一种经济实用的繁殖方法。

Porcine parvovirus and pseudorabies virus are the main causes of infectious reproductive failure in swine.

猪细小病毒和伪狂犬病毒均是引起母猪繁殖障碍的主要病原，猪细小病毒的危害主要表现为，导致初产母猪或血清学阴性的经产母猪发生繁殖障碍，其它年。。。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。