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The results showed that 4-HR combined preventing browning reagent has good controling browning effects on the above four kinds of materials. The best combination to apple-slice is A2B2C1, namely 0.02% 4-HR, 0.03% antiscorbutic acid and 0.5% citric acid; the best combination to banana-slice is A2B2C2, namely 0.02% 4-HR, 0.03% antiscorbutic acid and 0.75% citric acid; the best combina...

实验结果表明4-HR组合防褐试剂对上述四种材料均表现良好的护色效果，其中对苹果切片的最佳组合是A2B2C1，即0.02%4-HR、0.03%抗坏血酸、0.5%柠檬酸；香蕉最佳组合是A2B2C2，即0.02%4-HR、0.03%抗坏血酸、0.75%柠檬酸；马铃薯切片和莲藕汁的最佳组合都是A1B1C2，即0.01%4-HR、0.02%抗坏血酸、0.75%柠檬酸。

To restore the ability of chromium can be dissolved in sulfuric acid, hydrochloric acid and High-FE acid and release hydrogen, but also of pure chromium with aqua regia does not work, when there is the presence of halogen ions in the acid can not be long-term stability, high temperature with alkali, hydrogen sulfide, sulfur steam, phosphorus, ammonia, such as carbon monoxide and water vapor reaction of the corresponding compounds, in the high temperature reaction of silicon into the silicide also chromium, chromium alloys with many metals generate a wide range of industrial applications, such as chromium-manganese stainless steel is used extensively for chemical plants.

铬的还原能力强，能溶于硫酸、盐酸和高FE氯酸而放出氢气，但纯铬连王水也不起作用，当有卤素离子存在时，在酸中不能长期稳定，高温时能与强碱、硫化氢、硫蒸汽、磷、氨、一氧化碳和水蒸汽等反应生成对应的化合物，在高温下还能与硅反应成硅化铬，铬能与许多金属生成合金广泛在工业上应用，如铬锰不锈钢大量用于化工设备。

Glucose,formic acid and levulinic acid were not detected in the liquors of acid hydrolysis and the concentration of xylose and arabinose was high,while the acetic acid was low.

目前，国内外用高效液相色谱法测定糖类化合物已有许多报道[4-10]，但同时分析单糖及脂肪酸的报道仅在Solang等[3]的研究中略有叙述。

Results: The linear ranges for inorganic arsenic, monomethylarsonic acid and dimethylarsonic acid were all from 5.0 to 100.0 μg/L The detection limits of As(superscript 3+), As(superscript 5+), monomethylarsonic acid and dimethylarsonic acid were 0.05 mg/kg. The recoveries of the method were 78%-110%(n=6), and the relative standard deviations were

结果：本方法的三价砷、五价砷、一甲基砷和二甲基砷在5.0~100.0 μg/L范围内有良好的线性，方法的测定低限均为0.05 mg/kg；实验表明方法对不同海产品的回收率在78%~110%之间，相对标准偏差在3.0%~12.2%之间。

We can find from the research that the IR and XRD spectrogram shows the exists of H_3BO_3 on the surface of cellulose;there is H~+ released form the solution and the complexation proportion of the boric acid-glucose in the solution is 1:1, the boric acid-mannitol is 1:2 and the boric acid-N-methylglucamine is 1:2;and the half experienced mathematics model experiment on analyzing PH shows that the cellulose's adsorption of the boracic acid is mainly chemical adsorption with a proportion of 1:1 while physical adsorption with the H~+ released during the reaction plays a role as assistance.

研究结果表明，通过IR和XRD谱图分析，表明纤维素上吸附了H_3BO_3；硼酸和葡萄糖、甘露醇、N-甲基葡萄糖胺在水溶中络合比分别为1：1，1：2，1：2，同时溶液中有H~+释放出来；应用半经验数学模型分析pH值-浓度吸附实验，表明纤维素对硼酸主要以化学吸附为主吸附比为1：1，以物理吸附为辅，反应过程中释放出H~+。

The fact that chloric acid, bromic acid and iodic acid in acid solution are different in oxidizing properties is illustrated through the thermodynamic principles in this paper.

应用热力学原理对氯酸、溴酸和碘酸在酸性溶液中的氧化性强度不同的事实进行了分析说明，其氧化性强度按 HIO3

After 20 days, at the end of fermentation, the cassava residue inoculated has better sensory quality, but the treatments of adding low levels of saccharose have low lactic acid accumulation amounts and high butanoic acid accumulation amounts compared with the treatments of adding high levels of saccharose, the treatment with inoculation and 4% saccharose addition has the highest lactic acid accumulation amount, which is 18.7 g/kg, and the treatment with inoculation and 8% saccharose addition has the lowest butanoic acid accumulation amount, which is 0.141g/kg.

结果显示：在发酵开始时接种处理的乳酸菌数为5×108 cfu/g，而对照处理没有检测到；发酵结束后，接种的3个糖水平处理的外观发酵品质比未接种处理好，但糖浓度低时丁酸积累较多，乳酸积累少，接种并添加4%蔗糖的处理乳酸积累量最高，发酵物中乳酸积累达18.7 g/kg，接种并添加8%蔗糖的处理丁酸积累最少，仅为0.141 g/kg。

Content of butanoic acid, methyl ester; butanoic acid, ethyl ester; hexanoic acid, methyl ester; DMHF; DMMF identified in strawberry cultivated from green house were higher than that cultivated in the open field of the correspongding nitrogen levels , and the hexanoic acid, ethyl ester could only identified in green house strawberries.

不同氮素水平温室草莓果实中丁酸甲酯、丁酸乙酯、己酸甲酯、DMHF、DMMF的相对含量和总量均比相应氮素水平的露地草莓的高，且己酸乙酯只是在温室草莓中检测到。

Both in green house and in the open field ,relative content and total content of characteristic aroma components:of butanoic acid, methyl ester; butanoic acid, ethyl ester; hexanoic acid, methyl ester; hexanoic acid, ethyl ester; DMHF; DMMF trended to increase and then decline with the increment of nitrogen fertilizer, and the highest was the Mid-N fertilizer treatment. So favorable nitrogen application can promote the process of fruit aroma, that is , feasible fertilizer application could enhance fruit flavor.

在温室和露地两种栽培条件下，除成熟草莓果实的特征香气成分丁酸甲酯、丁酸乙酯、己酸甲酯、己酸乙酯、DMHF、DMMF的相对含量和总量均是随施氮量增加先增加后减少，中量氮肥处理最高，合理的施氮量有利于果实香气的形成，即适宜的施肥量有利于增进果实风味。3。

Two haptens of MCPA, 6-[(2-methyl-4-chlor phenoxy aceto amino] hexanoic acid and 4-[(2-methyl-4-chlor phenoxy aceto amino]butanoic acid were synthesized with MCPA and amino-hexanoic acid or amino-butanoic acid.

以除草剂2甲4氯、氯化亚砜、氨基己酸和氨基丁酸等为起始原料，经两步化学反应分别合成了两种MCPA半抗原：6-(2-甲基-4-氯苯氧乙酰基)氨基己酸和4-(2-甲基-4-氯苯氧乙酰基)氨基丁酸。

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。