When the reproduction subject maintains his or her own reproduction rights,meanwhile he or she must respect other's corresponding rights,thus to reach the balance of right among different reproduction subjects.This paper calls for strengthening the promotion and education of reproduction responsibility ethics,and constructing the ethical surroundings of "sharing rights and responsibility".

The abuse and nonstandard use of medical technology lead to various social issues,while the current medical technology assessment is still quite backward.Under these circumstances,it is of urgent need to emphasize the significance of medical technology assessment,strengthen assessment of the social adaptability of medical technology,proceed the whole-range assessment,build an independent review board,and improve the quality of assessment workers.In order to realize the above goals,we should transform government's role-orientation,strengthen the managing function of government,and perfect hospital management system.

Abuse of medical technology is ever more prominent in current medical practice.The rapid development of medical technology brings us a great opportunity to improve the role of moral construction,propel transformation of moral concept,and achieve the harmony between the implemental rationality and value rationality.In order to regulate to the application of medical technology,construction of responsibility ethics as well as ideal education should be strengthened.Both the construction of individual ethics and systemized ethics must be emphasized.The former dynamic mode of management must be changed and construction of medical ethics committee be emphasized so as to systemize and organize the ethical assessment of medical technology.

Systemized ethics is the evitable choice of the history development. The rise of systemized ethics is the important change of emphasis on morality construction. The implement of systemized ethics is not only beneficial to organically integrate universality and advance, but also realize the moral-living theory. The exertion of function of systemized ethics depends on the degree of systemized ethics.

The innovation of social structure propels the advent of systemized ethics,which is a unity of objectivity and rationality.The systemized ethics is the foundation of the morality reconstruction,and the main manifestation of modern ethics.It's not only universal applicable,but acceptable also.

The network teaching reformation is a result of the rapid development of internet technology and the creation of constructivism theory.The Webquest form practice of network teaching depends on the careful analysis of network teaching aim,the reasonable design of network teaching content,and the scientific arrangement of network teaching plate.The application of the Webquest form is a useful attempt.It is helpful to improve the comprehensive qualities of medical students.And it is helpful to re-construct the relationship between the teacher and the student.

Guided by the theory of constructivism,we utilize the internet resource to design the teaching of medical ethics under the condition of information,change the traditional teaching method and utilize the new teaching ideas.When teaching knowledge,we also advocate students'ability,attitude and quality.

Bone marrow stromal stem cells have been used in cartilage tissue engineering for nearly 20 years. This has been a key focus in stem cell research. This article serves to review application, progress and facing problems of bone marrow mesenchymal stem cells (BMSCs) in cartilage tissue engineering by retrieving publications. With the development of molecular biology, biomaterial, computer and nano-biotechnology, tissue-engineered cartilage constructed with BMSCs as seed cells combined with biomaterial stent has a widely application perspective in repairing articular cartilage defect.

BACKGROUND: To understand mechanism, biological property and morphological component of nanometer bone material and discuss present status and applied prospect.DATA SOURCES: A computer-based online search of Medline database was undertaken to identify articles about mechanism, biological property and morphological component of nanometer bone material in English from January 1966 to February 2006, and the key works were novel bioactive materials and bone tissue engineering; meanwhile, Chinese relevant articles were retrieved in Chinese in Tsinghua database from January 2001 toOctober 2004, and the key words were nanometer bone and clinical application.STUDY SELECTION: Articles in disposal group and control group were retrieved firstly. Those obviously non-random and repetitive researches were excluded. Full text of the rest articles was looked up finally.DATA EXTRACTION: Tlere were 124 articles about mechanism, biological property and morphological component of nanometer bone material. Among them, 27 experiments or clinical researches were included.DATA SYNTHESIS: Nanometer bone has favorable conductibility and induction of bone; meanwhile, it is characterized by human-like grading structure and multi-well structure of rangu, favorable biocompatibility and stable biodegradation.Nanometer bone material also can be used in confluence of vertebral body, the buccal surgery fields, the gene therapy of uncompleted osteogenesis, rheumatic arthritis (RA) and malignant tumor. Nanometer bone material is tendency to perfection through improvement of technology.CONCLUSION: Nanometer bone material with many particular properties overcomes many difficulties and achieves a satisfactory effect at clinical pilot phase.

OBJECTIVE: The interrelationship between various growth factors and chondrocytic regeneration has drawn the attentions of scholars and the study on growth factors and repair of articular cartilage defects has been carried on to summarize the latest progression of transforming growth factor-β (TGF-β) in articular cartilage repair so as to provide theoretical evidence for its application in cartilage histoengineering.DATA SOURCES: The relevant papers about studies on mechanism and types of articular cartilage injury, TGF-β and interrelationship between TGF-β and articular cartilage repair were looked up on http:∥www.ncbi.nlm. nih.gov/PubMed from January 1995 to December 2004. The retrieval words were "TGF-β, articular cartilage" limited only in English version.The relevant papers about studies on TGF-β and articular cartilage repair were also looked up on http:∥www.zglckf. com and linked database from January 1999 to December 2004, with the retrieval words of "TGF-β, articular cartilage" limited only in English version.STUDY SELECTION: During the initial evaluation of data and after looking up the quotation of each paper, the inclusive criteria were determined as follows: the paper should be relevant with TGF-β repair of articular cartilage injury; and the exclusive criteria: repeated research and Meta analysis papers. The papers that had not been excluded applied randomized design, control and blind comparison.DATA EXTRACTION: Altogether 95 papers were collected on TGF-βand TGF-β repair of articular cartilage injury, of which, 15 papers were in conformity of inclusive criteria, 56 papers were excluded due to dated research and 24 papers were due to repeated research. Of 15 papers, 3 papers were on the mechanism and types of articular cartilage injury, 6 papers were on biological function of TGF-β and 6 papers were on TGF-βand TGF-β repair of articular cartilage injury.pact, cut, torsion and friction, which is beyond the physiological endurance of articular cartilage. Articular cartilage defects are divided into defects of partial thickness and entire layer of cartilage. The auto-repair growth factor with various functions, which is produced by either autocrine or paracrine. It starts transmitting information by integrating with lagen and stromatin by irritating osteocytes and chondrocytes to form rapidly extracellular matrix so as to promote repair of bone and cartilage injury.CONCLUSION: TGF-β plays the importance in histoengineering repair of articular cartilage injury. By bringing induction of cartilage into play,TGF-β promotes differentiation of stem cells into cartilage or enhances specific matrix synthesis of cartilage, such as collagen Ⅱ and proteoglycan. Due to the limitation of various repair methods of cartilage defects at present, being a cell factor with good cartilage induction, TGF-βwill present extensive prospects in the application of cartilage histoengineering.