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nutrition
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     Nutrition and Eyesight
     营养不均危及视力
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     Nutrition of the piglet
     仔猪的营养
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  nutrition
However, in habitats lacking sufficient nutrition and with higher light intensity, survival rates and space-occupying ability of two kinds of seedlings (sexual and asexual produced) were low and the space would be preempted by grown-up plantlets.
      
In terrestrial ecosystems, soil nutrient regimes at a plant's living site generally represent the plant's "nutrition habitat".
      
Plant species frequently well adapt to their original "nutrition habitat" during a long process of evolution, and the apparent preference for ammonium or nitrate nitrogen source (NH4+ or NO3-) might be an important aspect of the adaptation.
      
A large number of studies show that the "nutrition habitats" associated with primary forest soils are typically dominated by NH4+ rather than NO3-, generally with NO3- content much lower than NH4+.
      
Higher soil N had advantage to non-leguminous plants growth on nutrition-poor sand land definitely.
      
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The effect of soybean phosphatide on toad hearts at higher temperatures(22-30℃) depends upon the duration of perfusion. In the first 2-3 hours there is always a strengthening of contraction, while after 5-10 hours, when the heart gives much feebler contraction due to exhaustion, this beneficial effect of phosphatide tends to disappear. The exhausted heart can, however, be made to improve by simply adding glucose to the perfusion fluid. Promptly the contractility of the heart recovers. Glucose thus, plays an...

The effect of soybean phosphatide on toad hearts at higher temperatures(22-30℃) depends upon the duration of perfusion. In the first 2-3 hours there is always a strengthening of contraction, while after 5-10 hours, when the heart gives much feebler contraction due to exhaustion, this beneficial effect of phosphatide tends to disappear. The exhausted heart can, however, be made to improve by simply adding glucose to the perfusion fluid. Promptly the contractility of the heart recovers. Glucose thus, plays an important role in the nutrition of the exhausted tissue. However in the first 2-3 hours after isolation when the heart is still relatively fresh, the added glucose is apparently not utilized. The consumption of glucose of the exhausted heart is in direct proportion to environmental temperature. In this series of experiments, the rate of consumption of glucose per gram heart tissue per hour is 0.84, 1.45 and 4.05 miligrams at 15-16℃, 22-23℃ and 27-30℃ respectively.

(一)磷脂對在較高室温長期灌流而衰弱的心臟或呈較弱而不持久的興奮作用,或竟無顯明的影響。 (二)葡萄糖在灌流液中的作用視室温與離體時間而定。在較高室温長期灌流而衰竭的心臟,葡萄糖是必要的,它可以維持心肌收縮並被心肌所消耗。如心臟離體時間較短,室温較低,則葡萄糖並非必需。 (三)在較高室温,長期灌流而衰竭的心臟,葡萄糖恢復心臟的搏動並為心肌所消耗。其消耗速率,在15—16℃,22—23℃以及27—30℃,每克心肌各為0.84,1.45,及4.05毫克/小時。本文在沈(?)淇教授指導下写作,特此致謝。

1. Firmiana simplex has been cultivated by our Chinese people in both ancient and modein times for medical use, and for the making of furnitures and musical instruments, as well as ornamental tree.2. The distribution of this plant is wide-spread almost through entire China. According to the writer's observation it grows vigorously and reaches its maximum height in the lower part of the Yangtze basin.3. In 1929 Yen states that sex differentiation of Firmiana simplex might be due to the fact of nutrition,...

1. Firmiana simplex has been cultivated by our Chinese people in both ancient and modein times for medical use, and for the making of furnitures and musical instruments, as well as ornamental tree.2. The distribution of this plant is wide-spread almost through entire China. According to the writer's observation it grows vigorously and reaches its maximum height in the lower part of the Yangtze basin.3. In 1929 Yen states that sex differentiation of Firmiana simplex might be due to the fact of nutrition, the writer, after visiting various parts of China, discovered that everywhere this plant has the same phenomenon of sex differentiation. This fact leads to a new conclusion that sex differentiation in this plant is certainly not entirely influenced by nutrition; it may be due to the historical factor of the plant it-self.4. No phcllum is developed in the hypodermis except in the region of Icnticels. Epidermis, therefore, may grow permanently and never break off. These are very rare even among the perennial woody plants.5. Characteristics which are considered peculiar to Firmiana simplex are: (1) closely arranged epidermal cells may become loose during the increase of the diameter of the branches, (2) rupturing of the fissures on the bark while the branch grows, (3) development of secondary epidermis from the hypodermal cells within the fissures and the lenticels, and (4) continuous division of the epidermal cells. All these characteristics are facts which explain the permanence of epidermis.

1、梧桐具有观赏,药用,制造器物等价值,我国民众自古就加栽培利用。 2、梧桐上分布几遍及全国,据我所见到的是长江中、下游地区所生长的比较繁茂高大,北京的最为矮小,厦门比北京的高大些,昆明虽然不及长江流域的但比厦门的似乎又茂盛高大些。 3、关于梧桐花两性分异,以前以为是养料的关系,但是现在观察了各地的梧桐花,发现它们对于性的分异都是一样之后,我认为造成性的分异可能下仅是单纯养料的问题。也许和有机体自身的历史发展因素有关。 4、苹婆和大多数多年生木本植物相同,它们茎部表皮的寿命不过1年。新枝条的下皮层在当年夏秋之际分化木栓组织。以后,表皮细胞就会枯死脱落。 5、梧桐,除皮孔而外,枝干表皮层之下一概不发生木栓组织,表皮层与枝干同寿,这是多年生树木中少有的微状。 6、梧桐表皮细胞,随枝干之加粗而疏离,又可分裂增多,同时条状裂纹也可以随枝杆直经之增加而开裂加宽,这些都是表皮长生不老的因素。 7、梧桐树皮裂纹中的下皮细胞向外分裂成为次生表皮组织,这是很特别的。

Four 14 to 19, year old boys are used as subjects in this study. The first part of this study attempts to investigate the vitamin C status of these subjects when they are consuming the ordinary diet served in the college staff dining room. The vitamin C content of the whole meal is determined by the dye titration method for ten days. During the first 2 days, blood samples are taken from finger tips and the plasma analyed for vitamin C by the Farmer and Abt method. 24-hour urine samples are also collected and...

Four 14 to 19, year old boys are used as subjects in this study. The first part of this study attempts to investigate the vitamin C status of these subjects when they are consuming the ordinary diet served in the college staff dining room. The vitamin C content of the whole meal is determined by the dye titration method for ten days. During the first 2 days, blood samples are taken from finger tips and the plasma analyed for vitamin C by the Farmer and Abt method. 24-hour urine samples are also collected and the vitamin C content determined.After the first 3 days, in addition to the vitamin C in the diet, the subjects are subjected to vitamin C saturation by taking orally 400 mg of vitamin C form orange juice for two days followed by 5 days of 100 mg supplementation of crystalline vitamin C. Plasma vitamin C and 24-hour urinary vitamin C are ag(?) studied. Following this procedure, the subjects are considered ready for experimentation. They are put on an experimental diet similar to their ordinary d(?) but devoid of vitamin C. The vitamin C intake level is controlled. Three lev(?) are tried: 70 mg, 50 mg, and 30 mg daily. Each level is fed for 14 days. The vitamin C of the first seven days is provided by vegetables frequently used (?) Canton and crystalline vitamin C is used during the latter 7 days for comparison. Cantonese cabbage(Brassica chinensis L.), Kan Lan Tsai(Brassica alboclabia, R.) and Chinese celery cabbage(Brassica pekinensis, R.)are used for supplying vitamin C during the 70, 50 and 30 mg levels respectively. Plasma vitamin C and 24-hour urinary excretion are determined for the last 5 days of each period.The vitamin C content of the medical college diet averages 43.7 mg per day for the 10 days analyzed. Plasma vitamin C of the subjects ranges from 0.25 to 0.61 mg percent, averaging 0.37 mg percent. 24-hour urinary excretion varies between 3.3 and 74.8 mg daily.During saturation, plasma vitamin C of one subject increases after the first dose, while its content in the plasma of the other three subjects also shows gradual rise. Urinary excretions show immediate and considerable increases on the first day with each of the subjects.During the 70 mg vitamin C daily intake level, plasma vitamin C average 0.45 mg percent and 0.48 mg percent for Brassica chinensis, L. and for crystalline vitamin C respectively. Daily urinary excretions average 19.4 and 18.4 mg. for the two periods. When the vitamin C intake is reduced to 50 mg daily, an average of 0.40 mg percent of plasma ascorbic acid is found for Brassica alboclabia, L. and 0.32 mg percent for crystalline vitamin C. Urinary excretion decreases to 15.2 and 11.9 mg daily. At the 30 mg daily intake level, plasma vitamin C falls to 0.32 mg percent for Chinese celery cabbage and 0.31 mg percent for crystalline vitamin C. Total urinary vitamin C falls to 9.9 and 9.0 mg.The vitamin C from these 3 vegetables are at least as efficiently utilized as crystalline vitamin C.While it is not quite possible to draw definite conclusions in regard to vitamin C requirement of these subjects from the results of this study, there are suggestions however that a daily intake of about 50 mg of vitamin C may be able to maintain a fairly satisfactory state of vitamin C nutrition.

本研究的目的在于初步探讨广州市一般维生素C的营养水平,测定广州所产的三种蔬菜所含维生素C在人体内的利用率,并观察在每日维生素C进食量为70、50、30毫克时,血浆维生素C与尿液维生素C排量的变化,从而商讨广州地区人民的维生素C需要量问题。

 
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