临界期

在水分临界期，叶片具有较高的含水量。

The leaves has high containing water during water critical period .

高山杜鹃花芽分化临界期生理生化研究

Physiological and biochemical research on critical period of floral initiation in Rhododendron hybrides

种子休眠与萌发的不同阶段内源乙烯（C2H2）生成量不同，在解除休眠临界期有一个乙烯生成高峰，故可以认为乙烯是打破休眠的启动因子。

Ethylene production changed during the different stages of dormancy and germination . A peak of ethylene production occurred on the 30th day after stratification at 2 ℃ .

200例UA病人在情绪低潮期UA日平均发作人数最高，与情绪高潮期和临界期UA日平均发作人数相比，差异均有显著性（P＜0.01）。

Daily mean attack number of people was highest in emotional low period and there was significant difference with emotional high and critical periods ( P < 0.01 ) .

当植株进入花芽分化临界期时，叶片中GA3含量以及POD和转化酶活性均开始剧增，而IAA含量开始剧减；

GA3 contents , POD activities and invertase activities started to increase significantly while IAA contents started to decrease significantly when plants entered the critical stage of flower-bud differentiation ;

水直播稻田千金子杂草防除临界期是播后7～40d。

The critical control period of the weed was 740 days after seeding .

玉米是需水较多的作物，对水分代谢的临界期在开花前8￣10d开始的约30d之内。

Corn is the crop , which needs much water . The critical stage of moisture metabolism is within 30 days beginning with 8-10 days before blooming .

在枇杷花芽生理分化期对照的内源激素变化中，GAs与ZRs都逐渐增加，在生理分化与形态分化临界期期含量达到了最高值，ZRs／GAs的值同时升高；

During the stage of physiological differentiation of the control , GAs , ZRs and the ratio of GAs / ZRs experienced a gradually increased course , whereas IAA decreased in the beginning and increased at the end of physiological differentiation .

结果表明：敌草快和肾上腺皮质激素对妊娠末期胎鼠动脉管具有收缩作用，且引起收缩的临界期均在胎龄19￣20d。

The result showed that diquat and adrenocortical hormone affect ductus arteriosus of rat fetus and the critical contraction time is between 19 and 20 days .

SOD和CAT活性一直呈下降趋势，但自30d开始CAT活性出现快速下降过程，5℃冷藏30d是蓖麻蚕蛹H2O2代谢的临界期生理时间，这与蚕蛹的30d冷藏阈值时间吻合。

But activities of CAT fall quickly from 30 days . So 30 days is physiologically a critical period of hydrogen peroxide metabolism under 5 ℃ cold storage and is consistent with the threshold value of cold storage of pupae .

秦冠苹果种子的总呼吸强度和EMP途径的呼吸强度在2℃条件下层积之后逐渐增加，解除休眠临界期大体在层积后第30天发生，此后增长速度较快。

The total respiration and EMP-pathway increased gradually and the critical period occur on the 30th day in " Qinguan " apple seeds after stratification at 2 ℃, and then the total respiration and EMP went up rapidly .

与产量损失率呈极显著S型生长曲线正相关，杂草防除经济阈值为株高干重积102.1mgm－2（混合密度为15～20株／m2）；危害临界期为小麦拔节前。

A simulated equation of weeds to wheat yield loss was established in this paper . The economic threshold for weed control was 102.1 m · g · m - 2 of the product of height and dry weight ( 15-20 plants / m 2 weed density ) .

现蕾期是水分的临界期。

Bud stage is the key stage for potato water needs .

甲状腺机能减退大鼠脑发育临界期神经元超微结构变化

Changes of Neuronal Ultrastructure During Brain Developmental Critical Periods of Experimental Hypothyroid Rats

农药一旦超过控制的临界期，就会导致残留问题。

Pesticide persistence beyond the critical period for control leads to residue problems .

黄瓜去顶苗花决定临界期的研究

Studies on the Critical Period of Floral Determinaton in Decapitated Seedlings of Cucumber

叶丛快速生长期是甜菜生长的需水临界期，这一时期缺水将严重影响产量。

Water is crucial for beet yield during the phyllome speed - growth stage .

关于人立体视敏感性临界期的研究

The critical period for susceptibility of human stereopsis

移栽临界期为7月28日。

The critical transplanting date is July 28 .

脑发育临界期的实验研究

The study on critical period of brain development

旱种水稻除草临界期为播种后第25～40天。

The critical period of weed control is at 25 to 40 days after sowing .

细胞分化的临界期就处于死亡程序执行中的某个阶段。

The critical phase of cell differentiation occurs when the death programme is being run .

提示在人体三节律的应用上，要对临界期的到来采取防范措施，特别应将情绪周期的临界期作为敏感指标，予以重视。

So it has been suggested that special preventive measures be taken for that critical tide . Three .

磷元素的临界期较早，而氮、钾元素的临界期相对较晚。

The critical period of nitrogen and phosphorous is early while the critical period of potassium is comparatively late .

造成1年生枝条冻害的主要原因是生长与休眠临界期枝条的大量失水；

The main cause of chilling injury in the annual branches was the losing of water at critical period ;

播娘蒿田间发生规律及其与冬小麦竞争临界期的初步研究

Preliminary research on regularity of occurrence of flixweed and the critical period of competition between flixweed and winter wheat

黄瓜去顶苗花分化临界期的确定及内源激素的动态变化

Studies on the critical period of floral differentiation and changes of endogenous hormone contents in the decapitated seedlings of cucumber

目的研究高碘对甲状腺激素以及甲减、高碘对脑发育临界期大鼠海马组织神经生长相关蛋白表达的影响。

ObjectiveTo study the expression of GAP-43 hippocampal formation during brain developmental critical period of both hypothyroid and excessive iodine rats .

商草生长对油菜和小麦的竟争临界期均在作物种植后30天至80天左右。

The competition threshold of weed to no only rape but also wheat were 30 to 80 days after crop planting .

未成熟大脑的这一奇特可塑性仅见于被称为临界期的一段短暂的时间（时窗）内。

The extraordinary plasticity of the young brain occurs only during a narrow window of time known as the critical period .