营养细胞

Four different pathways of androgenesis have been observed:Pathway of vege...

在雄核发育的研究中，观察到有营养细胞发育途径，生殖细胞发育途径，营养细胞和生殖细胞混合发育途径，以及均等分裂发育途径等四种类型，并对这四种途径进行了讨论。

The pupae were exposed to 9 krad 60Co-γ rays for two days before emergence.The adults were dissected and many mature sperms could be seen in the male flies.There were no significant difference in the form,number and vigor of sperm between irradiatid and unirradiated male flies,but there were some abnormal ultrastructurail changes in the sperm of irradiated male flies such as the appearence of vacuoles in nutrient cells,disarrangement of sperms,variation of the number of chondriosome derivates,axonemes ction of formation and abnormal cell division of sperm cells.

用9krad辐照羽化前2天的蛹，成虫羽化后解剖观察，雄虫已有大量成熟精子，精子形态、数量和活力与未经辐照处理的雄虫无显著差异，但其超微结构则发生了某些异常变化，如营养细胞出现空泡、精子排列零乱、线粒体衍生体和轴丝增多或减少、构型被破坏、精子细胞分裂异常等。

In general, every 9-11 vegetative cells there was one heterocyst, But to wild-type filaments, every 12 vegetative cells. Mp22 has strong phenotype. Cells grow slowly under BG11 medium, BG11〓 medium, iron-deficiency condition and NaCl stress conditions in contrast with wild-type.

在BG11〓培养条件下，突变株也能诱导异形胞，但异形胞发育却有差异，端生异形胞很多，一般每隔9-11个营养细胞就有一个异形胞，但野生株一般每隔12个以上细胞才有一个异形胞。

The ultrastructure characters of pollen grain in Brassica napus are:1There are vacuoles in cytoplasm but no starch grain in uniceelluar pollengrain.2The veget- ative nucleus of bicellular pollen grain is generally spheroidal;while the generative cell is spinde-shaped,with a big nucleus,thin layer of cytoplasmand few cell orgens,no cell wall.3In three-celled pollen grain the sperm cell is separated from the cytoplasm of vegetative cell by two layers of plasmic membrances.

Brassica napus的花粉粒，在不同发育时期超微结构的特征如下：1单胞花粉粒有一个球形的细胞核和明显的核仁，细胞质内出现液泡，缺少典型的淀粉粒。2双胞花粉粒的营养核多为球形。生殖细胞纺锤形，无细胞壁，细胞核比例大，细胞质呈薄层，细胞器少。3三胞花粉粒有一个裂片状的营养核和两个纺锤形的精细胞，精细胞无壁，以两层质膜与营养细胞的细胞质相隔。

The macronuclear and mitochondria DNA between the resting and the vegetative cell of Euplotes encysticus were comparatively analyzed by using RAPD technique in order to explore the acting feature of two genetic systems in the resting cell of ciliates.

为了探索纤毛虫休眠细胞中两套遗传系统的作用特征，对包囊游仆虫休眠细胞与营养细胞大核DNA和线粒体DNA进行了RAPD比较。

However, in insects with panoistic ovarioles containing no nurse cells, it is uncertain whether or not they contain maternal germ plasm or nuage.

然而，在不具有营养细胞的无营养细胞型微卵管中，母系生殖浆或生殖云是否存在仍属未定。

Mature trinucleate pollen grains showed a vegetative cell and two sperm cells, each sperm cell separated from the vegetative cytoplasm by two continuous membranes that enclosed the cytoplasm and nucleus.

成熟花粉为三细胞型，含有1个营养细胞和2个精细胞。

It is suggested that cyst germination inoculates sufficient vegetative cells into the water column and high cell densities contribute to the formation of cyst, which led to the next onset of algal bloom.

由此可见，大亚湾沉积物中该藻孢囊的萌发给水体提供了丰富的营养细胞，反之水体中高密度营养细胞又促使孢囊的大量形成，从而造成了锥状斯氏藻赤潮在大亚湾海域接连发生。

It is suggested that cyst germination inoculates sufficient vegetative cells into the water column and high cell densities contribute to the formation of cyst, which led to the next onset of algal bloom.

由此可见，大亚湾沉积物中该藻孢囊的萌发给水体提供了丰富的营养细胞，反之水体中高密度营养细胞又促使孢囊的大量形成，从而造成了锥状斯氏藻赤潮在大亚湾接连发生。

In some insects with meriostic ovarioles, maternal germ plasm is assembled during oogenesis and contains germline determinants that originated from the perinuclear nuage in the nurse cells.

在某些具有营养细胞型微卵管的昆虫当中，母系生殖浆在卵发育的过程形成，而且生殖浆内所含生殖细胞决定物质系来自於营养细胞的生殖云。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。