It becomes increasingly apparent that carcinogen-induced changes in epigenetic status may play an important role in mechanism of chemical carcinogenesis.

METHODS: Initiation and promotion two-stage chemical carcinogenesis method was used to induce cutaneous tumors in the mouse back skin.

方法：采用启动和促进两阶段化学诱癌方法在小鼠背部诱导皮肤肿瘤；

Chemical carcinogenesis in culture has proved to be a much more difficult field of investigation than viral carcinogenesis.

在培养内化学致癌已证明是一个比致癌困难得多的研究领域。

Chemical carcinogenesis comprises at least three stages: initiation, promotion and progression stages.

化学致癌过程至少包括三个阶段：启动、促进、发展。

The role of IFN-γ in tumor transplantation immunity and inhibition of chemical carcinogenesis

γ-干扰素在肿瘤移植免疫和化学致癌抑制中的作用

Enhancing the study of environmental carcinogenesis, teratogenesis and mutagenesis

加强环境致癌致畸致突变的研究

Studies of multistep process of environmental carcinogenesis using in vitro model for human fibroblast transformation

以人类成纤维细胞体外转化体系为模型研究环境致癌多步骤机制

Abstract In this paper, we expound the gist of the process control in thick-layer carburizing for heavy-duty gears which includes the selection of the suitable carburizing temperature, cycle and ratio of the carburizing to diffusing period, the way and the demand of carbon-potential control.

阐述了大型重载齿轮深层渗碳工艺控制的要点，包括渗碳温度和时间的合理选择，强渗与扩散时间的最佳分配，碳势控制的途径和要求。

Effect of silicon on microstructure and properties of meta-bainitic carburizing steel were studied.

研究了硅对准贝氏体渗碳钢渗碳组织与性能的影响。

Selection of Carburizing Steel for Rolling Mill Bearings and Design of Carburized Layer

轧机轴承渗碳钢的选择和渗碳层的设计

Study on Low Temperature Gas Multielement Co-penetration on Alloy Carburizing Steel Surface

合金渗碳钢表面低温气体多元共渗研究

Standard and Development Trend of Carburizing Steel for Automotive Gear

汽车渗碳齿轮钢标准和发展趋势

Improvement of the Multiple Impact Contact Fatigue Resistance of Carburizing Steel

提高渗碳钢多冲接触疲劳抗力的研究

Study on Rare-earth Deep Carburizing Steel

稀土深层渗碳钢的研究

Developing Status and Future of Carburizing Steel Used for Automotive Gears

汽车齿轮用渗碳钢的发展现状及前景

A new research& development of continuous gas carburizing furnace is described.

介绍了新研制的网带连续式气体渗碳炉。

Research& Development of Mesh Belt Continuous Gas Carburizing Furnace Group

网带连续式气体渗碳炉机组的研制

Study of Microcomputer Control System for Carburizing Furnace

渗碳炉微机控制系统研究

Application of Computer Control System in Gas Carburizing Furnace

计算机控制系统在气体渗碳炉上的应用

Two surface heat-treatment processes, liquid nitriding and sulfurizing, are used to compare with the current production process of liquid carburizing, with other variables remaining constant.

两种表面热处理液体渗氮及渗硫工艺与现行生产上原采用之液体渗炭淬火处理工艺，在尽量保持其他可变数不变的情状下加以比较。

On the other hand, Co binder gradient formed by liquid state carburizing is due to migration of W atoms driven by diffusion of carbon atoms, leading to coarser and closer WC grains in the surface and inward diffusion of Co atoms.

液相渗碳处理时钴相梯度结构形成主要是碳原子扩散驱动下的W原子迁移，导致表层碳化钨晶粒长大并相互靠近，从而使液态钴向合金内部迁移。