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Periodontal regeneration has been challenged with chemical reagents and/or biological approaches, however, there is still no sufficient technique that can regenerate complete periodontium, including alveolar bone, cementum, and well-oriented collagen fibers.

长期以来人们一直尝试用化学及或生物学方法来再生牙周组织。

At first, the color stability of different vat dyestuffs as dyed-reagents for viscose was studied. According to the results of experiments, we get to know that the conditions all will influence the color stability of vat dyes, such as the alkali with high concentration, oxidizing with alkali, and soap-washing.

本文首先研究了不同还原染料应用于粘胶纺液着色纺丝加工时的色光稳定性，讨论分析了高浓度碱剂、带碱氧化以及皂洗等工艺条件对还原染料色光稳定性的影响。

And we also get the fact that many vat dyestuffs can not be suitable for spun-dyed for viscose as dyed-reagents with the way of "reducing-oxidizing", such as C.I. Vat Blue 6, C.I. Vat Red 29, C.I. Vat Black 29, C.I. Vat Orange 1, C.I. Vat Brown 3 and so on. But some vat dyestuffs have a stable color, such as C.I. Vat Green 3, C.I. Vat Black 8 and so on.

通过实验可知，还原蓝BC、还原大红R、还原灰BG、还原金黄RK、还原棕R等还原染料，在高浓度碱剂、带碱氧化等加工条件下会产生不可逆的色光变化，而且变化程度较大，使得这些染料均不能以&还原－氧化&方式应用于粘胶的纺液着色加工，而还原橄榄绿B、还原灰M等染料受高浓度碱剂、带碱氧化等因素的影响较小，色光较为稳定。

This eliminates the waste of expensive reagents and fluids that might collect in a larger valve body.

这消除了昂贵的试剂和液体废物的收集可能在一个更大的阀体。

We want to buy Bio-Technology Products, Reagents and Supplies, Tooth Paste and Tooth Brush

我们要采购生化技术产品，试药和用品，牙膏和牙刷

Both reactions were integrated into a fluorometric flow-injection system with the same excitation and emission wavelength (340/425 nm). A three-way valve was introduced to switch between the reagents for sequential determination of tannin and amino acids.

由於两者均有相同之激发波长(340 nm)和接收波长(425 nm)，故可在同一台侦测仪器、同一套系统流路之检测环境下依序检测茶品中之单宁及胺基酸含量，开发一套简便之线上茶品检测系统。

This paper introduces several methods with some simple equipments and commom reagents to distinguish adulterated spearmint crude oil which mixed with animal oils , vegetable oils mineral oils , water soluble substances and other materials .

本文介绍了几种方法，利用简单设备，常用试剂对掺有动物油，植物油，矿物油，水溶性物质和其它掺假物的留兰香原油进行鉴别。

The company was established in 2001, covers an area of 16,000 square meters, are set production, sale and service of professional manufacturers, professional production·, chemical pure, pure electronics, industrial pure content specifications such as sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide, hydrogen peroxide, ammonia and other chemical raw materials and chemical reagents, as well as multi-layer circuit boards, flexible circuits board, semiconductor, electronic plating, chemical plating, wastewater treatment and a variety of electronic device manufacturers to provide supporting services.

公司成立于2001年，占地面积16000平方米，是集生产、销售、服务于一体的专业型厂商，专业生产分析纯、化学纯、电子纯、工业纯等各种规格含量的硫酸、硝酸、盐酸、氢氧化钠、双氧水、氨水等各种化工原料及化学试剂，并为多层电路板、软性电路板、半导体、电子电镀、化学电镀、废水处理及各种电子器件生产厂商提供配套服务。

Tetraallylsilane was synthesized by one-step approach through the reaction of silicon tetrachloride with the partially solvated Grignard reagents formed in situ from allyl bromide and magnesium in the mixed solvents of toluene and ether.

采用一步合成方式，将3-溴丙烯与金属镁在以甲苯和供电子溶剂构成的混合溶剂中进行反应，继而与四氯化硅反应，成功合成了四烯丙基硅烷，其产率在乙醚与3-溴丙烯的摩尔比为4(V甲苯/V乙醚=1·1)时达到极值，超过了91%。

Mainly for crude salt insoluble impurities through the filter to remove impurities soluble chemicals, Selection of the appropriate reagents transform it into filter to remove sediment.

主要是对粗食盐中不溶性杂质通过过滤法除去，可溶性杂质用化学法，选用合适的试剂使它转化为沉淀过滤除去。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。