Scientists first posed this question in the mid-1990s, after researchers came upon a chemical agent that in rodents seemed to reproduce many of caloric restriction's benefits.

科学家首次提出这个问题是在20世纪90年代中期。当时，研究人员偶然发现一种化学药剂，这种药剂在啮齿动物身上似乎可以发挥和热量限制相同的正面效果。

Research and Development of Chemical Agent;

产品研究与开发；

A chemical agent that kills eggs, especially the eggs of insects.

一种杀灭螨虫的化学药剂。

This is a chemical agent that destroys plants or inhibits their growth.

这是一种能除草或抑制其生长的化学药剂。

The chemical agent must be delivered in order to threaten someone, and the threat can be countered.

化学毒剂必须通过投放来实现威胁，而且这种威胁可以防范。

A certain injecting temperature is necessary at the beginning of injecting the chemical agent m.

在启动过程中掺入化学剂的温度对油井生产有一定的影响。

Lethal chemical Agent Countermeasures reviews some of the measures taken to defend against chemical attack.

致死性化学毒剂对策，综述了防御化学袭击的措施。

Use of a chemical agent to achieve diversion during matrix stimulation or similar injected treatments.

在基岩增产处理作业或类似的注入处理作业中使用一种化学剂来实现导流。

Each micro machine would be equipped with a sensor, either a video camera or a chemical agent detector.

每个微型机器人将配备一个传感器，可能是视频摄像机或化学剂探测器。

The modified bentonite is made by fixing modified chemical agent and bentonite at a proper ratio after maturity.

改性膨润土由改性剂与膨润土按一定的比例混合熟化后制成。

Tests on core PI value with multifunction device evaluating production chemical agent are described principally in this paper.

主要论述了在多功能采油化学用剂评价仪上进行的岩心PI值试验的步骤、现象及结论。

Surfactant is a kind of chemical agent which can enhance oil recovery greatly and has wide fitness for purpose and development potential.

表面活性剂是提高采收率幅度较大、适用较广、具有发展潜力的一种化学驱油剂。

The chemical agent ethanol, which is used as an oxygenated additive to diesel fuel, improves combustion characteristics of diesel engines.

乙醇作为一种含氧的添加剂可以改善柴油机的燃烧。

Development and effectiveness of CR anti-corrosive chemical agent added to the cooling-water system of bulb-generator are analysed systematically.

本文系统地对灯泡贯流式发电机冷却水系统中添加CR防腐化学药剂的研制与使用效果进行了分析。

The laboratory experiment presents that chemical agent injection with steam is the effective means for improving recovery factor of heavy oil reservoir.

室内实验表明，伴蒸汽注入化学剂是提高稠油油藏采收率的有效手段。

Cellulase can apparently improve the drainage of bleached wheat pulp, the mechanism of this action is different from that of conventional chemical agent.

纤维素酶能够明显改善漂白麦草浆滤水性能，其作用机理和一般化学助剂不同，酶处理后的浆料有较好的抄造性能、纸张有较好的匀度。

A review is made on the new process of pigment exhaust dyeing under normal temperature of chemical agent grafted and modified various fabrics without binder.

论述了各类织物经化学助剂接枝改性，在不使用粘合剂的情况下，用浸染方法对织物在常温下进行涂料染色的新工艺。

This article refers to what PPD can undermine the special structure of thick crude oil, and crude oil viscosity and pour point reduction in the chemical agent.

本文所说降凝剂是指能破坏特稠原油的结构力，使原油粘度和凝点降低的化学剂。

The criteria for tooth selection dictated no pretreatment with a chemical agent such as alcohol, formalin, or hydrogen peroxide, or any other form of bleaching.

牙齿挑选标准规定未做过像酒精、甲醛、过氧化氢和其他漂白剂等化学用品预处理。

The normal disinfection and sterilization was described. There are heat sterilization, sterilization by ultraviolet rays irradiation and chemical agent disinfection.

介绍了常用消毒灭菌方法，有加热消毒法， 紫外线辐射法和化学药剂消毒法。

For laundry room all kinds of items and ensure the laundry chemical agent is properly used, use the right quantity to reduce cost, improve quality and avoid accidents.

申领洗衣房各类物品并确保化学剂等被恰当地使用，使用正确的数量以降低成本、提高质量，避免事故。

After "years of research", said the state news agency KCNA, it devised a chemical agent that could lengthen the blooming period by a week in summer or by 20 days in winter.

朝中社称经过“多年的研究”，他们找到了一种化学试剂，该试剂能延长花期，使其在夏季冬季分别延长一个星期和二十余天。

Menthol is a chemical agent, menthol by the mint leaves and stems in the extract, white crystals, molecular formula C10H20O, mint, and peppermint oil to the main ingredient.

薄荷脑是一种化学药剂，薄荷脑系由薄荷的叶和茎中所提取，白色晶体，分子式c 10h20o，为薄荷和欧薄荷精油中的主要成分。

The present invention relates to a chemical agent for firming epoxy resin, in particular it is applicable to the low-temp. and moisture environment and underwater operation.

本发明涉及一种用于环氧树脂固化的药剂，特别适用于低温、潮湿环境及水下施工作业。

The researched results show that the combined usage of the chemical agent HJ-1 with HJ-3, HJ-4 and HJ-5 can reduce the concentration of magnesium ions in the saline wastewater.

对离子交换树脂再生盐水回用工艺进行了实验研究。实验结果表明：当HJ-1与HJ-3、HJ-4、HJ-5联合使用时，再生盐水中镁离子的浓度可大幅度地降低。

Ferrate is green, non-pollution chemical agent and has powerful oxidization and high selectivity. From the view of protecting environment, the application of ferrate is more remarkable.

高铁酸盐是绿色、无污染化学试剂，具有强氧化性和高选择性，从环保角度出发，其用途更是引人注目。

The chemical agent is sprayed into the smoke through a revolving sprayer, thereby being capable of effectively removing the gaseous mercury and achieving the aim of purifying the smoke.

通过旋转喷雾器喷入烟气中，即可有效去除气态汞，达到净化烟气的目的。

Aimed at Liaohe heavy oil reservoirs, a new type of high temperature fleeing proof chemical agent FPJ was developed by the research of foamability, foam stability and sealing characteristic.

针对辽河油田稠油油藏特点，通过发泡性能、泡沫稳定性以及高温下的封堵性能的研究，研制出一种新型的高温防窜化学剂体系FPJ。

The experimental mud(EM) is prepared by introducing 2% sulfonated asphalt(SA), FT1, as control chemical agent or PSA into 4% bentonite mud and used for evaluating sealing and inhibiting capacities.

在4%膨润土浆中加入2%仿磺化沥青或磺化沥青FT1（对比剂）制成实验浆液，用以测定封堵性和抑制性。