Objective To investigate physical activities of preschool children by gender and to explore the effects of activity type on bone indexes.Methods During 2009 and 2010,397 preschool children of 3-5 years old were randomly selected from 4 kindergartens in Chengdu Province of China.Ultrasound bone analyzer was used to assess children's bone mass.A physical activity questionnaire was completed by parents to evaluate physical activities at leisure time.Student's t test and least square regression were used for data analysis.Results Concerning activity types,boys spent more leisure time on running and Wushu than girls did (t values were 1.94 and 2.84,respectively ; both P ＜ 0.05).However,girls spent more time on dancing (0.78 h),jumping rope (0.08 h) and manual labour (0.22 h) each day (t values were-9.50,-3.43 and-1.92,respectively; all P ＜ 0.05).The weekly total exercise time and energy consumption per unit of body weight of girls vs.boys were 7.29 vs.6.51 h and 127.57 vs.113.85 kJ (t values were 2.63 and 2.04,respectively ; both P ＜ 0.05).About per day time on sleeping and per week time on watching television,there were no significant difference between boys and girls (t =0.180,0.520;P ＞0.05).But boys spent more time on electronic game and computer than girls (t =0.760,2.510;P ＜ 0.05).The normalized correlation coefficient for bone mass and moderate physical activities or jumping was 0.184 and 0.275,respectively (both P ＜ 0.05).Conclusions Our data suggest that preschool children's bone volume may be positively correlated with moderate physical activities and jumping activities.Introducing some moderate physical activities or activity appliance,toys and playing fields as well as increasing professional training might be helpful.

Objective:To determinate the substances with high molecular weight in porcine anterior pituitary and adrenal cortex extracts injection. Methods:The HPLC analysis was performed on a TSK-GEL G2000SWXL(7. 8 mm × 300 mm,5 μm) column with the mobile phase of trifluoroacetic acid-acetonitrile-water(0. 05:35:65). The flow rate was 0. 5 ml·min-1, and the detection wave-length was 214 nm. Results:The substances with high molecular weight in porcine anterior pituitary and adrenal cortex extracts injec-tion was below 1%. Conclusion:The method is simple and repeatable, which can be used for the control of the substances with high molecular weight in porcine anterior pituitary and adrenal cortex extracts injection.

Objective To analyze and investigate the diagnosis method and treatment measures of insulinoma.Methods The clinical data in 16 cases of insulinoma in the hepatobiliary surgery of our institute from Dec.2008 to Dec.2015 were retrospectively analyzed.Results All cases had typical Whipple′s triad,the biochemical examination suggested that all cases had plasma glucose decrease and plasma insulin increase during the onset period.The imaging examinations included preoperative ultrasonography,enhanced CT,MRI,EUS and intraoperative ultrasound (IOUS).Their diagnosis positive rates were 56.3% (9/16),77.8% (7/9),80.0% (8/10),100.0%(2/2) and 100.0%(5/5) respectively.Sixteen cases all received surgical treatment,including local tumor excision in 6 cases,simple distal pancreatectomy in 3 cases,distal pancreatectomy plus splenectomy in 5 cases and pancreaticoduodenectomy(PD) in 2 cases.Plasma glucose level in all cases was significantly increased after tumor removal.Postoperative follow-up lasted for 1-5 years without recurrence and metastasis.Conclusion The first choice of insulinoma localization diagnosis is CT and MRI,intraoperative palpation combined with IOUS is the main method of intraoperative localization,and the surgical resection is the only effective method for treating this disease.

Objective To evaluate the effect of early intracoronary injection of tirofiban via aspiration catheter on myocardial no-reflow in elderly patients with acute ST-segment elevation myocardial infarction (STEMI).Methods 120 consecutive patients over 65 years old with AMI undergoing primary percutaneous coronary intervention (PCI) were randomized into two groups.In tirofiban group (n=60),thrombus aspiration and intracoronary tirofiban bolus (10 μg/kg prior to the first balloon inflation) via aspiration catheter were performed.In control group (n=60),thrombus aspiration was followed by primary PCI.The incidence of no-reflow and bleeding were assessed in the two groups.Results The moderate to severe bleeding (TIMI bleeding criteria) did not occur in the two groups,there's no significant difference between two groups in the incidence of minor bleeding [26.7％(16 cases) vs.21.7％ (13 cases),x2 =0.19,P=0.522].The incidence of myocardial noreflow was significantly lower in tirofiban group than in the control group [10.0％ (6/60) vs.25.0％ (15/60),x2 =4.68,P=0.031].Conclusions The intracoronary injection of tirofiban via aspiration catheter may significantly reduce the incidence of myocardial no-reflow in patients with STEMI without increasing bleeding complications.

BACKGROUND:Human embryonic stem cels are able to self-renew indefinitely and have the capacity to differentiate into al three germ layers (ectoderm, endoderm and mesoderm). These properties imply great potential in the basic research and clinical application, including regenerative medicine, drug screening and toxins, early human embryo, cel transplantation, gene therapy,etc. However, it is a substantial chalenge to develop efficient techniques for their large-scale culture under defined conditions, and for controling and directing their differentiation. For therapeutic purposes, many scholars are trying to establish methods for maintaining pluripotency in defined xeno-free conditions and scalable culture systems. OBJECTIVE:To discuss the progress of serum-free culture systems in human embryonic stem cel research reported in recent years and to highlight the chalenges and advances being made towards the development of serum-free and xeno-free culture systems suitable for therapeutic applications. METHODS:A computer-based search of CNKI and PubMed academic database was performed for articles addressing serum-free culture systems of human embryonic stem cels published from 2008 to 2015. Repetitive and old articles were excluded. Finaly, 58 articles were summarized. RESULTS AND CONCLUSION:Several groups have attempted to exclude individual animal components by using feeder-free matrices, feeder cels of human origin, or defined xeno-free media, aiming to select a suitable matrix and medium that can minimize or not use heterologous components, in order to obtain cel lines at clinical level. However, the current cel products are far from clinical application. There are stil many problems to be solved, such as standardization, normalization and individualization of cel products. With the normative development of stem cel research and industry, human embryonic stem cel products are expected to be widely used in clinic.

OBJECTIVE: To review the development and mechanism of platelet-rich plasma (PRP) and the unsolved problems so as to provide reference for the clinical application of PRP.DATA SOURCES: Articles on effects of platelet-rich plasma on bone repair are searched from Medline between January 1995 and June 2005 on computer. The key words were platelet rich plasma, bone, and repair.Meanwhile, the same search was conducted to determine the correlated articles during January 1998 to June 2005 from Wanfang database with key words of platelet-rich plasma, bone and repair in Chinese.STUDY SELECTION: Literatures at home and abroad on the PRP and bone repair were chosen; Non-randomized controlled literatures were included.DATA EXTRACTION: Totally 40 out of 49 reports related to PRP and bone repair met the criteria. 9 reports were excluded due to the repeated same research. The rest 40 reports were sorted out and conducted literature review.DATA SYNTHESIS: Platelet-rich plasma was originally used in clinic to repair mandibular defect in 1998, by adding PRP to grafts with a radiographic maturation rate 1.62 to 2.16 times that of grafts without PRP. Up to now, PRP has been used in many medical areas to accelerate tissue healing due to its advantages of safety, simple, low-cost. But some problems still remain to be studied and solved.CONCLUSION: PRP includes many sorts of growth factors and has been proved to be beneficial to the maturation of both bone tissue and soft tissues. PRP is autologous and can be produced easily and safely from autologous blood, without the concerns of transmissions and immunological rejection of various diseases.

Objective To provide anatomical evidence for the repair of wounds of finger distal phalanx,espe-cially for the recovery of feeling. Methods 10 samples of fresh adult hand were dissected under microscope. The course,branches,distribution and external diameter of nerves and blood vessels in finger distal phalanx and morpho-logical relationship between nerves and vessels were measured. Results Proper palmar digital nerves mostly step over digital arteries at section starts of distal finger arterial arcades and go to finger pulps and latero-backs. Their thinks di-vide into 2 branches. Transverse diameters of interior and exterior branches are 0.8 ～ 1.2 mm and 0.9 ～ 1.4 mm re-spectively at liner semilunaris levels. Distributionsof left and right branches are reciprocal chiasmas. Conclusion Finger nerve mostly ramifies to finger pulp,finger tip and finger back at the level of phalangette bottom. Its branches are lower and thinner than concomitant arteries. The suitable anatomy region for anastomosis of nerves and blood ves-sels is the middle1/3 section from the distal interphalangeal joint to the nail during replanation of amputated finger pa-ratelum.

Objective To investigate the effects of different chromatogram fingerprints analysis methods on the quality evaluation of Chinese herbal medicine. Methods With the chromatogram fingerprints of a Chinese patent medicine in different batches as the analytic object, the quality evaluation of three methods such as peak area ratio,peak area quantification and similarity coefficient were investigated. Results The method of peak area ratio has the highest accuracy rate and the precise rate for quality evaluation, and similarity coefficient and peak area quantification came next. The result of peak area quantification was similar to that by current evaluation method. Conclusion Different chromatogram fingerprints analysis methods would result in a great difference in the quality evaluation of Chinese herbal medicine.

The database design of multi-focal visual electric-physiological examining system is introduced in this paper.Microsoft Access 97 is used to design the database.VC++ can append,query or delete records of the database through DAO interface.It reflects such advantages that the database is easy to be managed and convenient to be queried.The design pattern can be transplanted to other medical devices' design.

Background Artisan phakic intraocular lens (pIOL) implantation was demonstrated to be safe and effective for the correction of high myopia in short-term.However,long-term corneal endothelium status after operation should be concerned.Objective This study was to investigate the long-term changes of corneal endothelial cell density (ECD) and morphology following Artisan pIOL implantation for the correction of high myopia.Methods Fifty-one eyes of 27 patients who received Artisan PIOL implantation for high myopia from January 2005 to December 2008 were retrospectively analyzed.The central corneal ECDs were detected by corneal endothelial cell counter before surgery and 6 months and 1 year,2,3,4,5,6 years after surgery,and the coefficient of variation (CV) and standard deviation (SD) of cellular area were evaluated.ECD loss rate with time lapse was calculated ([preoperative ECD-postoperative ECD]/preoperative ECD× 100％).Results Six years after surgery,there were 34 eyes with BCVA ≥ 1.0,14 eyes with BCVA higher than preoperative and 8 eyes with BCVA lower than preoperative.The mean intraocular pressure was (14.23±2.14)mmHg 6 years postoperative.The preoperative mean ECD was (3 184.05±233.55)/mm2,and the ECD was gradually reduced over time with the cell loss 2.34％ in 6 months,5.32％ in 1 year,6.32％ in 2 years,8.06％ in 3 years,12.59％ in 4 years,15.63％ in 5 years and 19.49％ in 6 years after operation.Before surgery,The mean CV of cellular area was 37.17±7.12,and the SD of cellular area was 118.77±21.39,and those 6 years after surgery were 32.24 ±4.62 and 125.60± 18.49,respectively.The mean CV and SD of cellular area were significantly different among different time points (P =0.000,0.036).Eight eyes with localized iris depigmentation,6 eyes with IOL dyssymmetry,3 eyes with transient high intraocular pressure and 2 eyes with Macular hemorrhage were obtained after surgery.Conclusions Corneal endothelial cells appear obvious changes in both number and morphology after Artisan pIOL implantation in high myopia.ECD is gradually reduced with time lapse,and the shape of the cells occur remodeling during 6-year fellow-up duration.Overall,endothelial specular microscopy is mandatory before and after surgery for a long term.