Objective To investigate the effects of passaging on the proliferation,differentiation and apoptosis of neural stem cells.Methods Neural stem cells both from prime culture(P0) and twice-passaged culture(P2) were tested by enzyme immunoassay for proliferation and fluorescent activated cell sorting for apoptosis by Annexin V-FITC and propidium iodide.After being enduced to differentiation for 7 days,they were detected by the neuronal marker MAP2 and the astrocyte marker GFAP with nuclei staining by Hoechst 33342 additionally.The ratios of MAP2+/Hoechst+ and GFAP+/Hoechst+ were calculated.Results The absorbance of NSCs from P0 and P2 is 1.1899?0.0485(n=13)and 0.3526?0.1053(n=11)(P=0.000).Analyses of apoptosis using cytoflurometry are 40.91%?12.74% for P0(n=8)and 24.31%?13.01% for P2(n=9,P=0.018).The ratios of MAP2+/Hoechst+ and GFAP+/Hoechst+ of NSCs from P0 were 58.81%?9.69%(n=10)和22.85%?4.36%(n=10) while the ones for P2 were 27.84%?5.70%(n=10)and 49.32%?6.95%(n=10,P=0.000).Conclusions By passaging the proliferation and apoptosis of NSCs decreases and they differentiate into less neurons and more astrocytes.

Objective With the comparison of the proliferation,differentiation and apoptosis of neural stem cells from different embryonic stages,to obtain the biology of NSCs and the development mechanism of embryonic cortex underlining.Methods After the prime culture of NSCs from forebrain cortice of different embryonic stages(E14,E18 and E20),enzyme immunoassay for NSCs proliferation was carried out.After 7 days of differentiation induced by fetal bovine serum,they were detected by the neuronal marker MAP2 and the astrocyte marker GFAP with nuclei staining by Hoechst 33342 additionally.The ratios of MAP2+/Hoechst+ and GFAP+/Hoechst+ were calculated.Fluorescent activated cell sorting for apoptosis were used to detect the apoptosis of NSCs by Annexin V-FITC and propidium iodide.Results The absorbance of NSCs is 1.1771?0.0422(n=22) for E14,0.4127?0.0328(n=23) for E18,and 0.4127?0.0456(n=16) for E20(P

0.05). Course of type A was 7.61?5.80 months,and much longer than average course of all patients (7.56?5.95 months),P

Myocardial Infarction ; physiopathology ; Myocardium ; Myocytes, Cardiac ; physiology ; Regeneration ; Tissue Engineering

Objective To establish a model to predict the cell-cycle process in response to ionizing radiation.Methods Human choroidal malignant melanoma 92-1 cells were used and the cell cycle distribution of cells was analyzed in 0-96 h after exposure to X-rays.A phenomenological model was constructed based on biological knowledge to describe the cell cycle dynamics in experiments.Results In the present study,a phenomenological model was constructed to describe the cellcycle dynamics of synchronized 92-1 cells in responding to various doses of ionizing radiation.The simulation results obtained with the model were consistent with the experimental data,demonstrating that the model had a good expansibility and could be used to predict the dynamics of cell cycle in responding to ionizing radiation.Further theoretical modeling of the cellcycle dynamics was made and the results were consistent with the simulation.Conclusions A phenomenological model was constructed which could be used to describe the dynamics of cell cycle of cells exposed to ionizing radiation and was supported by the experimental data.Because this model is easy to run by the written code,it has a good expansibility for studying the behaviors of cell populations under various conditions.

Objective Speckle is the inherent problem exists in B-Mode ultrasound image,and effective speckle noise reduction will improve the image quality and contribute greatly to clinical doctors to diagnose,especially in fine ophthalmic examination with high frequency ultrasound.Methods This paper proposed a new speckle reduction method based on the Laplacian pyramid and multiscale analysis.In the Laplacian pyramid,true clinical features were separated from noise,according to the different bandpass ultrasound image characteristics in each layer,and the advanced eight directions speckle reduction anisotropic diffusion (SRAD)was adapted to suppressed the speckle noise,and the identified noise and the extracted features were selectively emphasized by suitable edge,coherence and contrast enhancement filtering from fine to coarse scales.The performance of the proposed method was compared to the traditional SRAD method and coherence-enhancing diffusion method by measuring the equivalent number of looks (ENL) and Time cost.Results The ENL and Time cost value of the proposed method were higher compared to the SRAD and the cedif method,i.e 1.172 3 vs 1.122 3,0.929 3 and 0.864 0 vs 1.396 0,1.468 3.Conclusions In summary,the proposed method can more effectively remove the speckle noise while preserving the edge and details of the images.

Objective　To investigate the diagnose and therapy of patients with smooth muscle tumors (SMTs) of gstrointestinal tract (GI). Methods　A retrospective analysis was made on the clinical and pathological data of 92 patients with SMTs of GI admitted from 1982 to 1999 in Nanfang Hospital. Results　Location of the lesion: 41 cases in stomach, 44 in small intestine, and 7 in large bowel. Adjuvant examinations: BUS was performed on 63 cases with positive findings in 31; CT on 27 cases with positive findings in 20; DSA on 29 cases with positive findings in 27; barium series on 45 with positive findings in 28; and small intestinoscopy on 11 cases with pasitive findings in 2. Conclusions　DSA is the most effective method in diagnoses of SMTs of GI, especially for small intestinal leiomyoma. The primary treatment of GI-SMTs is surgical resection.

Through comparing of the cultivation models for master and doctoral postgraduate of two schools of nursing in Hong Kong,the viewpoint that the relatively perfect cultivation models for nursing postgraduate in Hong Kong had been formed was pointed out.Reformation of exam-oriented admission requirements,rationalization of cultivation types,enrichment of cultivation directions as well as making cultivation objectives explicitly,curriculum optimized and evaluation system improved should be suggested and referenced by domestic nursing educational innovators.

Objective To explore the relationships between serum adiponectin,IL-6 and hypoxic-ischemic encephalopathy(HIE) degree in newborn infant.Methods Enzyme-linked immunoabsorbent assay was used to detect the serum adiponectin and IL-6 in 58 neonatal HIE and 26 neonates without HIE.And all the data were processed by SPSS 10.0 software.Results The level of serum adiponectin in moderate and severe HIE at acute stage were significantly lower than that of mild and control groups(Pa0.05).The level of serum IL-6 in moderate and severe HIE at acute stage were significantly higher than that of the mild and control groups(Pa0.05).The level of adiponectin were significant negative correlation with IL-6(r=-0.852 P

Objective To investigate the met ho ds of isolation,culturing and passaging of neural stem cells originated from ra t embryonic brains.Methods The neural stem cells were obtained from the brain tissue of rat embryos.They were cultured and passaged with serum-free medium.T hey were identified with Nestin and stained with NF68,GFAP,and GalC after diff erentiation.Results We cultured the neural stem cells through several passages .With the help of serum,they differentiated to neurons,astrocytes and oligode ndrocytes.Conclusion The neural stem cells derived from rat embryonic brains a re able to proliferate and multiplepotent for differentiation.