维生素

A vitamin precursor that the body converts to its active form through normal metabolic processes.Carotene,for example,is a provitamin of vitamin A.

维生素原一种由身体通过正常新陈代谢过程，将其转化成活跃形式的维生素的前体，比如，胡萝卜素是维生素A的维生素原

In this double-blind trial at the University Hospital in Bern, Switzerland, 553 patients enrolled after successful angioplasty of at least one significant coronary stenosis of at least 50% were randomized to treatment with a combination of folic acid (1 mg/d), vitamin B12 (cyanocobalamin, 400 g/d), and vitamin B6 (pyridoxine hydrochloride, 10 mg/d), or with placebo for six months.

瑞士伯恩市大学医院所进行的双盲试验，共有553名患者，其至少有一条冠状动脉狭窄超过50％，并经过成功的血管重建术，这些患者被随机分配接受叶酸(1 mg/d)、维生素B12 (氰钴维生素， 400 Ig/d)联合治疗和维生素B6 (维生素B6 的氢溴化物， 10 mg/d)治疗，或安慰剂治疗，时间是6个月。

To make clinical go up Zun of use armour saltpetre is more reasonable, safe, the article injects with respect to armour saltpetre Zun the problem of conpatibility of medicines of fluid, make following discussing.

为了使临床上使用甲硝唑更加合理、平安，本文就甲硝唑注射液的配伍新问题，作如下探索。1和维生素的合理配伍使用1.1和维生素C注射液的配伍使用甲硝唑在5%葡萄糖溶液中加入处方量的维生素C放置24h，维生素C含量和pH值均无明显变化。

This product is a natural vitamin E, vitamin C,β-cyclodextrin, mannitol, lactose, povidone K30, citric acid, tartrazine, butyric acid butyl ester, stearic acid, magnesium as the main raw material of health food products , with added vitamin E, vitamin C, health care function.

本品是以天然维生素E，维生素C，β-环糊精，甘露醇，乳糖，聚维酮K30，柠檬酸，柠檬黄，丁酸丁脂，硬脂酸镁为主要原料制成的保健食品，具有补充维生素E ，维生素C 的保健功能。

There are two forms of it : d- tocopherol and dl-tocopherol. d- is the natural form and dl- is the synthetic form.

它有两种形式：d-维生素E 和dl-维生素E.d-维生素E 是自然形式，dl-维生素E 是合成形式。

When vitamin A effect having stout , lubricating skin , is short of, skin becomes dry , rough; Vitamin B has the fleck effect to extend a wrinkle , removes; Vitamin C may prevent the skin blood vessel from ageing , strengthen blood vessel elasticity , increase white skin, effect cutting down skin chromatosis; Decrease acne the and pigment come into being Wei Sheng Su E , have and resisting the effect old and feeble.

维生素A有强健、润滑皮肤的作用，缺乏时，皮肤变得干燥、粗糙；维生素B有舒展皱纹、消除斑点作用；维生素C可防止皮肤血管老化，增强血管弹性，增白皮肤，减少皮肤色素沉着的作用；维生素E可减少痤疮和色素生成，并有抗衰老作用。

In order to investigate the effect of temperature on the vitamin C in jujube juice and decrease the loss of vitamin C in the processing of jujube juice, the thermal degradation kinetics of Ascorbic Acid at 303, 313, 323, 333 and 343 K in the clarified jujube juice were investigated, and a mathematical model to predict Dehydroascorbic Acid concentration was also established.

为了了解加热温度对红枣汁中维生素C含量变化的影响，降低红枣汁在加工过程中维生素C的损失，该文以红枣澄清汁为材料，采用可逆的一级反应模型研究了不同加热温度下还原型维生素C的降解规律并推导出氧化型维生素C含量变化的数学模型。

Results show that ascorbic acid and dehydroascorbic acid of cloudy strawberry juice in the storage process are unstable to the heat treatment; the degradation of ascorbic acid and dehydroascorbic acid accords with first-order dynamic, which indicates that this degeneration dynamic model is logical and effective, and can be used in selection of storing temperature and prediction of storage period at different temperatures.

结果表明：草莓浑浊汁在贮藏过程中还原型维生素C和氧化型维生素C对热不稳定，还原型维生素C和氧化型维生素C降解符合一级反应动力学。经过验证表明该降解动力学模型有效，可用于草莓浑浊汁贮藏温度的选择和预测不同温度下的贮藏期。

The relationiships among storage temperature, storage time and degradation of ascorbic acid and dehyd roascorbic acid in the process of cloudy strawberry juice storage were analyzed, and the degradadion dynamic model of ascorbic acid and dehydroascorbic acid was established.

该文通过研究草莓浑浊汁贮藏过程中还原型维生素C和氧化型维生素C的降解与贮藏温度、贮藏时间的关系，建立了还原型维生素C和氧化型维生素C降解动力学模型。

To investigate Vitamin C and lycopene contents in different parts of watermelons fruit, 7 triploid seedless watermelon cultivars, including 6 red and 1 yellow flesh, were sampled to determine their total ascorbic acid, ascorbic acid, dehydroascorbic acid and lycopene contents. TAA, AA, DHAA and lycopene contents of 3 uncut red flesh seedless watermelon cultivars were measured after storage at room temperature for 2 months.

为了研究西瓜不同部位维生素C、番茄红素含量，对6个红瓤和1个黄瓤无籽西瓜品种果实不同部位总维生素C、还原型维生素C、氧化型维生素C和番茄红素含量进行测定，并检测红瓤无籽西瓜整瓜贮藏2个月后各成分损失率。

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。