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One is at low growth temperature, the origin of mound formation can be attributed to an intrinsic growth instability of a singular surface in the presence of so-called Ehrlich-Schwoebel step-edge barrier, which inhibit the downward movement of adatoms at surface step-edges. The other is at high temperature, or at low Ⅴ/Ⅲ ratio, the reason of mound formation is related to phosphorus deficiency.

其主要原因有两种,第一种是生长温度较低时,由于吸附原子受到附加的ES台阶边垒的阻碍作用,使扩散运动不能向台阶下面运动,而在台阶上面形成小丘,第二种是生长温度较高或Ⅴ/Ⅲ较低时,因生长中缺磷造成In的堆积而产生。

The results showed that the optimal temperature for the growth of BY-3 was 30~ 40℃. And the optimal pH was 6~6.5. Besides, the optimal cultivated time was 36~52 h. The favorite carbon source included maltase, sucrose, mannitol, glucose, lactose, and so on.

拮抗菌BY-3菌株的研究 2.1 拮抗菌BY-3菌株生长特性的测定本研究确定了不同的温度、pH、营养条件及盐浓度对菌株BY-3生长的影响,并对其生长曲线作了测定。

There is increasing evidence that development of preimplantation embryo is regulated by maternally and embryonically derived growth factors.

大量研究证据表明,许多生长因子和受体存在于早期胚胎和雌性生殖道中,哺乳动物早期胚胎的发育受到母源和胚胎自身生长因子的调节,生长因子以旁分泌、自分泌和内在分泌的方式作用于胚胎,调节胚胎细胞的功能。

This paper gives a mathematical model for the growth phenomena,and discusses its additive property,monotonicity and stability.

本文给出了生长过程的数学模型,讨论了生长过程的可加性、单调性和简单生长过程的稳定性。

The surface morphology of the nacreous layer on different parts of Pteria Penguin and blister pearl from Sanya, Hainan Province, are observed directly by using environmental scanning electron microscope.

研究结果表明,该地区海水成因的珍珠层中有机质薄膜对珍珠层的螺旋生长成核和结晶取向起到了严格的调控作用,它为文石或方解石晶体的生长提供一个有效的定位或成核中心;有机质与文石微晶在时间和空间上的螺旋交互生长具有周期性,从而产生珍珠层表面的这种结构形态。

Administration of NGF may treat the spinal cord and periphery nerve injured and improve the function of damage nerve.

神经生长因子是最先发现和被证实的细胞生长调节因子,NGF在神经细胞的增殖,分裂和轴突的生长、递质的合成及细胞的凋亡等阶段均起着重要作用,NGF对中枢和周围神经的损伤均有保护和促进恢复的作用,尤其是NGF促进神经细胞的再生,给予NGF可减轻和改善对神经元的损害和治疗外伤引起的脊髓和周围神经损伤。

The first order approximation solution of temperature and interface for the spherical crystal growth in the undercooled melt is solved by the asymptotic analysis method.

结果表明在球晶生长过程中依赖于界面温度变化的界面动力学显著地减缓了晶体生长的速度,与忽略界面动力学的情形比较,界面动力学显著地拟制了球晶界面生长

Under some situations, such as the growth hormone, thyroxine, Gonad hormone secrete insufficient cause sluggish growth, will have one phenomenon that growth run into after being supplementary proper, That is also because the grow board hasn't close yet, cartilage cell still may be accepted amazingly and occur the phenomone of Split and ossify.

某些情况下,比如生长激素,甲状腺素,性腺激素分泌不足而致的生长迟滞,给予适当的补充后会有一段生长赶上的现象,那也是因为生长板还没有闭合,软骨细胞仍可以接受刺激,分裂、骨化。

Ransforming growth factor beta TGF-β is a potent growth suppressor of normal epithelial cells. However, many types of invasive cancer cells (e.g. breast cancer frequently overproduce TGF-β to enhance their growth and metastasis. Quite frequently, these cells do not possess a functional type II TGF-β receptor, indicating an aberrant TGF-β signaling is responsible for promoting cell growth.

Transforming growth factor beta 对於正常的上皮细胞是一个很强的生长抑制因子,然而,许多种具有蔓延侵犯性的癌细胞常常是表现大量的 TGF-β来促进细胞生长与转移,这些癌细胞通常不表现具有功能性的第二型 TGF-β receptor,显示有另类的 TGF-β讯息传递可以促进细胞生长

The optimum temperature for paramecium culture was 25 ℃ and optimum propagation temperature was 10-30 ℃. The growth condition of paramecium was better when the pH value was in the range of 5.0-10.0, but the optimum growth environment was neutral or near to alkalescence.

草履虫生长的最适温度是25℃,最适繁殖温度在1030℃。pH值在5.0~10.0的范围内,草履虫的生长状况都较好,但最适合于在中性略偏酸的环境中生长

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力