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An analysis of the medical risks exposure for resident doctors in their standardized training,and insights into the risk management measures proposed for this stage.These measures include:1) Pre-control of risks;2) Full-length supervisor of such training stage;3) Systematic education for medical risk exposure;4) Timely guidance on risk identification and response;5) Development of the evidence awareness.

OBJECTIVEThe effect of light intensities on the endogenous hormones of Bletilla striata during seedling acclimatization was studied in order to explain the mechanism and provide basic data for conservation and cultivation of this wild medicinal species.

METHODThe samples was treated with three photosynthetic photon flux densities: 3 000, 6 000, 12 000 lx during the acclimatization stage to study the hormone dynamic changes of IAA, ABA, GA3.

RESULTEndogenous IAA concentration was declined in all treatments and the lowest level in all treatments was the middle light intensity. A sharp increase of endogenous ABA concentration in a short period, the concentration was increased by 380.2% in middle light (320.8 ng x g(-1)). Endogenous GA3 concentration was declined especially in the high light treatment. At 10 days of acclimatization the GA3 concentration was decreased by 52.2% in the high light (473.6 ng x g(-1)).

RESULTEndogenous hormones concentration could be rapidly changed by the light, and endogenous ABA concentration could be sharply increased when acclimatization in middle light intensities.

Acclimatization ; Light ; Orchidaceae ; chemistry ; physiology ; radiation effects ; Photosynthesis ; radiation effects ; Plant Growth Regulators ; analysis ; metabolism ; Seedlings ; chemistry ; physiology ; radiation effects

AIM:To generate thalassemia-specific integration-free induced pluripotent stem cells ( iPSC) and to detect their ability of differentiation into hematopoietic precursors .METHODS:The plasmids pEB-C5 and pEB-Tg were transfected into the fibroblast cells from hemoglobin Bart ’ s hydrops fetalis ’ s skin by the method of nuclear transfection to reprogramm the cells into iPSC .The ability of the iPSC to differentiate into 3-germ layer cells was determined .The iPSC were cocultured with mouse OP 9 cells to differentiate into hematopoietic precursors and the hematopoietic precursor specific antigens were detected .RESULTS:The integration-free iPSC from hemoglobin Bart ’ s hydrops fetalis ’ s skin fibroblasts were successfully derived, and had the ability to differentiate into 3 germ layers.When cocultured with OP9 cells for 9 d, the positive rate of hematopoietic progenitor cell marker CD 34 was 18.7%, and the CD34 and CD45 double positive rate was 12.2%.CONCLUSION:Hemoglobin Bart ’ s hydrops fetalis ’ s skin fibroblasts can be successfully induced into “in-tegration-free” iPSC.This cell line has the ability to differentiate into 3 germ layers , and can be differentiated into hemato-poietic precursors when cocultured with OP 9 cells.

Lian Qiao Bai Du Wan was used to study the identification of Chinese patent medicine by molecular marker technique. DNA was extracted through modified CTAB method. The psbA-trnH and rbcL sequences were gradient amplified, and PCR products were ligated with the pEASY-T5 vector and then transformed into Trans1-T1 cells, respectively. Clones were selected randomly and sequenced. All sequences were analyzed by BlastN and the neighbor-joining (NJ) phylogenetic tree was constructed by MEGA 4.0. The results showed that nine kinds of medicinal materials can be identified by psbA-trnH sequences, and six kinds of medicinal materials by rbcL sequences from Lian Qiao Bai Du Wan. Molecular marker technique can stably and accurately distinguish multi-origin medicinal materials in Chinese patent medicine.

Alzheimer's disease (AD) is a central neurodegenerative disease with still unclear pathogenesis. Recent studies have shown that axonal transport dysfuction of mitochondria may contribute to AD progression. Normal mitochondrial axonal transport mainly involves microtubules, molecular motors and connexins, while AD early pathological changes can damage mitochondrial axonal transport by interfering with these proteins: accumulated β-amyloid (Aβ) impairs the function of molecular motors; abnormally modified Tau protein reduces microtubule stability; mutant presenilin-1 (PS1) can induce phosphorylation of some related proteins by activating glycogen synthase kinase-3β (GSK-3β); all these processes can damage mitochondrial axonal transport, leading to synaptic dysfunction. This review aims to clarify the possible mechanisms of axonal transport dysfuction of mitochondria in AD and provides new ideas for AD treatment.

Objective To develop anxiety scale suitable for Chinese pregnant women and evaluate its reliability and validity. Methods Based on existing research results and clinical experience,this study compiled pregnancy anxiety scale(PAS). A sample of 509 pregnant women were selected for investigation and 65 of them were randomly retested for test-retest reliability with 2 week interval. Item analysis was con-ducted to screen valid items. Then the construct validity of the scale was tested by exploratory factor analysis ( EFA) and confirmatory factor analysis(CFA). Finally the reliability and criterion validity of the scale were evaluated using Cronbach's α coefficient,retest reliability coefficient and Pearson correlation coefficient. Re-sults The PAS was composed of 27 items in four factors,including worry about delivery,worry about them-selves,worry about fetal health and general anxiety. The four factors were extracted by EFA which could ex-plain 62. 48% of the total variance. Besides,the result of CFA demonstrated that the model fitted the data with well construct validity (χ2/df=1. 89,RMR=0. 04,RMSEA=0. 06,IFI=0. 92,TLI=0. 91,CFI=0. 92, PGFI=0. 70,PNFI=0. 74,PCFI=0. 81). The score of the pregnancy-related anxiety scale and its factors scores were positively correlated with the scores of pregnancy-related anxiety questionnaire(PAQ) and child-birth attitudes questionnaire(CAQ). The correlation coefficients were 0. 60-0. 80 and 0. 50-0. 78 respectively (all P<0. 01). The Cronbach's α coefficient was 0. 93 for the total scale and that of the four factors ranged from 0. 82 to 0. 90. The test-retest reliability was 0. 68 for the total scale and ranged from 0. 54 to 0. 75 for the four factors. Conclusion The PAS has a good reliability and validity,and it can be used as a valid tool to measure the anxiety level of pregnant women.

With the development of molecular biology, biomaterials and tissue engineering, regenerative treatment of pulpal and periradicular diseases is facing new opportunities. At present, a large number of studies on dental pulp regeneration reveal that cytokines are essential for promoting migration, proliferation and osteogenic differentiation of dental pulp stem cells. In this paper, we review several kinds of cytokines related to dental pulp regeneration, and analyze their roles and regulatory mechanisms in dental pulp regeneration.

Microglia (MG) are resident immune cells in the central nervous system (CNS) and the first defense line of CNS damage. The maintenance of MG function requires abundant energy, and lipid can serve as an energy source for the brain when glucose utilization is limited, and lipid can also function as signaling molecule. Alzheimer's disease (AD) is the most common neurodegenerative disease, and MG lipid metabolism plays an important role in the development of this disease. Drugs targeting lipid metabolism provide a new direction for AD treatment. This review starts with the specific mechanism of lipid metabolism in MG, and briefly introduces the effect of lipid metabolism on MG function and its role in AD.