Children with sporadic Burkitt's lymphoma (BL) is a highly aggressive lymphoma.It partly overlaps with diffuse large B cell lymphoma (DLBCL) and unclassified B cell lymphoma (DLBCL/BL) which is between DLBCL and BL in the morphological,immunophenotypic and molecular genetic aspects,but it has its unique.characterization. Enhancing awareness of the disease based on the BL pathology, pathogenesis and prognosis of understanding,at the time of diagnosis and identificate with DLBCL and DLBCL/BL at the tine of diagnosis will be beneficial to clinical correct treatment and prognosis.

Objective To investigate the status of second trimester maternal serum screening for Down's syndrome from 2006 to 2009 to evaluate the screening quality in Beijing.Methods Birth defect data (birth defect register) from 2006 to 2009 and screening data reported by certificated screening hospitals from 2008 to 2009 in Beijing were retrospectively analyzed by descriptive statistic method.Results Three hundred and thirty Down' syndrome babies were delivered from 2006 to 2009 in Beijing,among which 166 mothers accepted Down' syndrome serum screening and 85(51.2％) were diagnosed finally according to the screening results;among the 85 mothers,35 were≥35 years old with the detection rate of 62.5％ (35/56),and 50 cases were ＜35 with the detection rate of 45.5％ (50/110).The prenatal diagnostic rate of Down's syndrome babies increased from 26.8％(11/41) in 2006 to 47.4％(46/97) in 2009.The detection rate of Down's syndrome with serum screening increased from 23.1％(3/13) in 2006 to 62.9％(22/35) in 2009.One hundred and fifty-eight 21-trisomy cases accepted mid-term ultrasound screening,among which 62 cases (39.2％) were found abnormal.Conclusions Quality control for second trimester maternal serum screening for Down's syndrome should be improved in Beijing.Second trimester maternal serum screening for Down's syndrome in elderly primipara is not suggested.More attention should be paid on prenatal ultrasound screening.

Acceleration of social and economic growth in China is raising China's migrant population to 160 million in 2010.Their reproductive health has a close bearing on the overall national quality of the Chinese people.This reveals the significance of studying the health status for continuous improvement of such a population in China.This study is based in communities to review the challenges faced in reproductive health of migrant population,with five recommendations for upgrading quality reproductive health in communities.

Objective　To explore the effect of photon on blood biologic components in blood photochemical treatment. Methods　After the blood sample was adjusted to an appropriate density, it was treated with 0.1 nmol/ml 8-MOP (8-methoxypsoralen), 0.1 nmol/ml TFO (triple helix-forming oligonuletide) and UVA (ultraviolet A radiation) at the intensity of 1 800 μW/cm2 for 3～20 min. The changes of biologic activities of major components in blood were measured with automatic blood gas analyzer, platelet aggregation analyzer, blood coagulation analyzer, micropipette aspiration system and assay of poly-lysine adsorption. Results　The oxygen content in blood was increased gradually. The resilience of erythrocyte was enhanced ，but its adhesiveness was decreased. The parameters related to blood coagulation had some changes but all remained within the normal ranges. Conclusion　Under the definite condition of blood virus being inactivated effectively, the nonspecific effect of photosensitive response may improve blood oxygen content, enhance the transfiguring ability of erythrocyte and decrease the blood viscosity, but having no obvious change on blood coagulation.

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Containing unique medical information and profound humanistic connotation,pas-sages with medical theme tend to be processed in a relatively superficial way in reading courses. This paper discussed the significance of English passages with medical theme and elucidated the de-pressing situation in teaching and learning as well as the reasons. Several approaches were proposed to resolve the present dilema in an attempt to improve the comprehensive humanistic qualities of med-ical students.

Objective To construct the double hairpin siRNA and green fluorescent protein(GFP) expressing vector pU6/double-siRNA/Neo/GFP/1A/2A to interfere 1A and 2A gene of Coxsackie virus B4.Methods 21 bp fragments of the Coxsackie virus B4 2A and 1A gene were chosen as the targets and 65 bp complimentary fragments were synthesized,then the target gene fragments were cloned into pSilencer2.1U6 Neo and pGCsi-U6/Neo/GFP/siNeGative,respectively,then the double siRNA expressing vector pU6/double-siRNA/Neo/GFP/1A /2A was constructed by restrict endonuclease digestion,elctrophoresis isolation and reclaimer,ligatied by T4 DNA ligase;then the double siRNA expressing plasmid was transfected into Hela cells,and the GFP was observed under fluorescent microscope.Results The correct results showed that the recombinant plasmid had the correct special fragments and DNA sequence detected by restrict endonuclease digestion, electrophoresis and DNA sequencing;and GFP was also observed in Hela cells tansfected with pU6/double-siRNA/Neo/GFP/1A /2A under fluorescent microscope more than 15 d after transfection.Conclusion The double siRNA expressing vector pU6/double-siRNA/Neo/GFP/1A/2A is constructed successfully;it has the correct target viral gene sequences and can express GFP gene in Hela cells more than 15 d after transfection.

Objective To supply anatomic foundation for TRAM and DIEP flaps breast reconstruction with both sensory innervation and rectus abdominis muscle function preserved. Methods Dissections of T8～T12 nerves in anterior abdominal wall were performed on 9 embalmed female cadavers (18 sides). By reconstructing DIEP flaps in 15 cases, the natures of the intercostal nerves and the relations with deep inferior epigastric perforators were investigated. Results Most intercostal nerves pierced the rectus abdominis muscle in the lateral one third. There were interconnections between muscular branches of segmental nerves. Sensory branches traveling with vascular perforators were divided into medial branch and lateral branch. The mean length of pure sensory nerve was (27.6?12.2)mm. Conclusion It is possible to preserve sensory innervation by coapting lower intercostal nerves to the 4th thoracic nerve in TRAM and DIEP breast reconstruction. Sparing lateral one third of rectus abdominis muscle does not cause denervated atrophy in the rectus abdominis muscle after TRAM breast reconstruction.

Objective To investigate the effects of HRT on endometrium of postmenopausal women.Methods 53 cases of postmenopausal vaginal bleeding(PMB),from Jan,1995 to Dec.1999 treated by HRT were selected to make a comparison with the other 60 cases of PMB without HRT during the corresponding period.Both groups had integrated ultrasonic and pathological data and getting information from succedent inspection.Results The rates of the endometrial carcinorma incidences that happen in the HRT group were non-HRT group were 5 66% and 8 33% respectively,which had little significant.While the occurring rates of inflammation were 1 89% and 16 67% respectively,a significant difference between the both existed here.Conclusions With HRT,the various symptoms of post menopause women can be efficiently improved.It is safe and effective in short term.But a close monitoring is absolutely necessary for its long term effect(5 years or more).

Objective To assess the effect of sodium nitroprusside (SNP)-induced hypotension on gastric intramucosal pH (pHi), gastric intramucosal PCO2 ( PgCO2 ) and the difference between PgCO2 and PaCO2 (PgCO2-PaCO2) .Methods Fifteen ASA I patients (11 male, 4 female) aged 22-43 yr8, weighing 51-68 kg undergoing laminectomy for decompression of spinal cord in prone position were enrolled in this study. The patients were intubated and mechanically ventilated with 100% O2 after induction of general anesthesia. Anesthesia was maintained with isoflurane (1.2-1.4%) . Radial artery was cannulated for BP monitoring and boood sampling. TRIP tonometry catheter 14 F was inserted into stomach and connected to Tonocap ( Datex-Ohmeda, Finland) . Controlled hypotension was induced with SNP infusion at 1-5 ?g kg-1 min-1 . MAP was reduced to (60 ?5) mm Hg in 5-7 min and maintained for 60 min. Blood samples were taken before induced hypotension (T, ) , at 30 min (T2 ) and 60 min of hypotension (T3) and 30 min after hypotension (T4) for blood gas analysis. pHi, PgCO2 -PaCO2 and PETCO2 were also determined.Results MAP decreased by 35% and 33% at T2 and T3 as compared with the baseline (T, ) . pHi decreased significantly and PgCO2, PgCO2-PaCO2 increased significantly at T, as compared with those at T( ( P 0.05). pH at T2 ,T3 and T4 and BE at T3 and T4 were significantly lower than the baseline value (T1). PaCO2 and PET CO2 were significantly higher at T4 than those at T, (P