[Design and Consideration on the Revision of China Medical Device Classifcation Directory].

The new version of () has opened to the public comments. This paper briefly introduces the classification of medical device in China and the historical development of the directory, and focuses on the analysis of the main changes in the new version of the directory to help the supervision department, manufactures, and related organizations better understand and use the new directory.

[Research on Standard System of Home Use Electronic Medical Devices].

Medical device going home is an inevitable trend, however, using these devices has potential safety risks. Through introducing the home use electronic medical device products and related medical device standards, this paper provides recommendations on construction of standard system for home use electronic medical devices, to improve the advancement of existing medical device standard system and guide future medical standardization work, to fully utilize standars's guiding and security role in the scientific and technological innovation, industrial development.

[Research on the Management System of Medical Device Recognized Consensus Standards in USA].

This paper gives a brief introduction on the development of recognized consensus standards, the recognition working procedure and the overview of medical devices recognized consensus standards in USA, and analyzes the experience of the recognition management system in USA, aiming at providing a reference for the improvement of the medical device standard management system in China.

The virulence of Streptococcus pneumoniae partially depends on dprA.

Streptococcus pneumoniae is one of the most frequent opportunistic pathogens worldwide. DNA processing protein A (DprA) is an important factor involved in bacterial uptake and DNA integration into bacterial genome, but its role in S. pneumoniae virulence remains unclear.

Arsenic exposure is associated with DNA hypermethylation of the tumor suppressor gene p16.

Background: Occupational and environmental exposure to inorganic arsenic leads to development of cancer and represents a significant health hazard in more than 70 countries. The underlying mechanism for arsenic-induced carcinogenesis remains unclear. Laboratory studies suggest that arsenic is a poor mutagen but may cause epigenetic silencing of key tumor suppressor genes such as p16 through DNA hypermethylation.

[International progress of unique device identification for medical devices].

Unique Device Identification (UDI) is a hot spot research area in the medical device administration. It comes a breakthrough from International Medical Device Regulators Forum (IMDRF) and government implementation recently. The article reviewed the advancement of IMDRF UDI program, discussed the framework for UDI system, analyzed the implementation of UDI in other countries, put forward some suggestions on the development of medical device coding system in our country.

Inhibition of protein phosphatase 2A with a small molecule LB100 radiosensitizes nasopharyngeal carcinoma xenografts by inducing mitotic catastrophe and blocking DNA damage repair.

Nasopharyngeal carcinoma (NPC), while uncommon worldwide, is a major health problem in China. Although local radiation and surgery provide good control of NPC, better treatments that permit reductions in radiation dosing are needed. Inhibition of protein phosphatase 2A (PP2A), a ubiquitous multifunctional enzyme with critical roles in cell cycle regulation and DNA-damage response, reportedly sensitizes cancer cells to radiation and chemotherapy.

[Preliminary discussion on the preparation of medical device standards].

This paper discussed some specific issues in the preparation of medical device standards. On the basis of GB/T 1.1-2009, some preliminary suggestions were accordingly proposed.