The effects of reaction temperature, pH, substrate and enzyme concentration, deacetylation degree of chitosan on the hydrolytic velocity of chitosan by Lysozyme were investigated. The results showed that the specificity of catalyst obey the dynamics of michae-lis-Menten. The optimum temperature and pH were 50℃ and 6. 0 respectively, the reaction velocity was reduced while the deacetylation degree of chitosan was raised. The mean molecular weight of low molecular chitosan has been determined by high performance liquid chro-matography method, the mean molecular weight was 8328.

Aged, 80 and over ; Humans ; Male ; Maxillary Sinus Neoplasms ; pathology ; Neoplasms, Muscle Tissue ; pathology

Antineoplastic Agents, Phytogenic ; administration & dosage ; pharmacology ; Apoptosis ; drug effects ; Cell Line, Tumor ; Dose-Response Relationship, Drug ; Glioma ; pathology ; Humans ; Sesquiterpenes ; administration & dosage ; pharmacology ; Time Factors

Anal Canal ; surgery ; Child ; Child, Preschool ; Colon, Sigmoid ; surgery ; Digestive System Surgical Procedures ; methods ; Female ; Hirschsprung Disease ; surgery ; Humans ; Infant ; Laparoscopy ; Male ; Rectum ; surgery ; Treatment Outcome

Objective To confirm the protective effect of berberine (BBR) on cold ischemia reperfusion (I/R)-induced liver injury and to show whether the hepatic protection conferred by BBR involves the activation of phosphatidylinositol 3 kinase (PI3K) / protein kinase B (Akt)/mammalian target of rapamycin(mTOR) signal pathway.Method Adult male Sprague-Dawley rats were assigned randomly to four groups:BBR group (BBR was intragastrically administered at a dose of 100 mg·kg-1 · d-1 2 weeks before hepatic cold I/R treatment),dimethyl sulfoxide (DMSO) group (BBR was replaced by DMSO,and others were the same as BBR group),I/R group (BBR was replaced by normal saline,and others were the same as BBR group) and sham group (normal saline was administered 2 weeks before opening and closing abdomen treatment).Then the rats were sacrificed at 3,6,and 24 h after reperfusion.The liver function,oxidative stress level,apoptosis rate,and the expression of PI3K/Akt/mTOR related pathway proteins were assayed.Result As compared with sham group,the I/R-induced liver tissue displayed severe lobular distortion with widespread necrosis,high level of oxidative stress and apoptosis rate.As compared with I/R group,BBR dramatically attenuated the histopathologic damage,restored the liver function and decreased the oxidative stress level.Simultaneously,BBR significantly ameliorated the apoptosis by decreasing the apoptosis rate,increasing the Bcl-2/Bax ratio and inhibiting caspase-3 activity in rats subjected to hepatic I/R.The expression of p-Akt was effectively upregulated with the inhibited expression of p-mTOR.Conclusion Our result provides robust in vivo evidence that BBR can prevent I/R-induced oxidative stress and apoptosis.The mechanisms involved can be attributed to the activation of P]3K/Akt/mTOR signal pathway.

Objective To establish a nerve stem cell model possessing the potentiality of differentiating intoγ-aminobutyric acid neuron-like cells(GABAergic-like cells),and provide eligible investigative vector for study on GABAergic neurons degenerative diseases. Methods Dibutyryl cyclic adenosine monophosphate (dbcAMP)was applied to induce human neuroblastoma SH-SY5Y cells,and the SH-SY5Y cells were divided into control group (0 mmol·L-1 dbcAMP),0.3 mmol·L-1 dbcAMP group,0.6 mmol·L-1 dbcAMP group,1.0 mmol·L-1 dbcAMP group and 2.0 mmol·L-1 dbcAMP group;the morphological changes of SH-SY5Y cells were observed.The Image-Pro Plus 5.0 software was used to measure the length of neurites of the neuron-like cells, and the percentage of the SH-SY5Y cells with neurites longer than 30 μm was calculated. The immunofluorescence cytochemistry technique was utilized to test GAD65 positive cells,and the positive rate of immune response was calculated.Results The results of light microscope observation showed that the cells in control group were polygonal,circular or shuttle type with smooth membrane and clear boundaries. With the increasing of the concentrations of dbcAMP and the prolongation of time,the morphology of SH-SY5Y cells’bodies became smaller with longer processes in dbcAMP groups.The cells interwined each other and showed mature neuron phenotype in 1.0 mmol·L-1 dbcAMP group.Compared with control group(31.4%±4.2%),the percentages of the cell with neurites longer than 30 μm in 0.3, 0.6, 1.0, and 2.0 dbcAMP groups (40.1%± 5.7%, 47.5%± 6.2%, 73.1%±3.2%,and 74.3%± 6.1%)72 h after induction were significantly increased(P<0.05 or P<0.01). Compared with control group (10.2%± 2.1%), the GAD65 positive expression rates in 0.3, 0.6, 1.0,and 2.0 mmol·L-1,dbcAMP groups(22.1%±2.4%,46.9%±3.2%,70.7%±3.4%,and 72.3%±3.7%)72 h after induction were significantly increased(P<0.05 or P<0.01).Conclusion The SH-SY5Y cells have the potentiality of differentiating into GABAergic-like cells, and 1.0 mmol · L-1 is the optimal concentration of dbcAMP.

Objective:Chemical constituents of Sophora flavescems Ait. were studied by different extraction. Methods: Online HPLC/ESI/MS was used to study the different extraction. Results: numbers of alkaloids and flavone from Sophora flavescens Ait. were 9,8 and 12, respectively by means of chloroform strong aqua , water , and water methanol extraction. Conclusions: For the first time, we studied extraction of Sophora flavescems Ait by HPLC MS. This provided basic for study on fingerprints of Sophora flavescems Ait..

Objective To analyze the concentrations and sources of heavy metals in the soils in city parks,so as to improve the city ecological environment quality and protect the health of people.Methods In December 2007,the distribution characteristics and concentrations of heavy metals(Hg,Cd,Pb,Cu,Zn,Ni,Cr,As)were investigated by ICP-AES and mercury analyzer after the soil samples were collected from six urban parks in Pudong,Shanghai.Results The results showed that the ranges of concentration were 21.08-69.31 mg/kg for Cu,41.87-91.71 mg/kg for Pb,104.65-213.83 mg/kg for Zn,84.63-894.28 mg/kg for Cr,0.15-0.26 mg/kg for Cd,19.14-25.32 mg/kg for As,0.02-0.55 mg/kg for Hg,39.30-454.36 mg/kg for Ni,which indicated that all heavy metals,but Cd had been accumulated in varying degree compared with the soil background contents of metal elements in Shanghai. Conclusion Based on the assessment with the single contamination index,Ni and Cr is relatively in a high level of the pollution in Park 1,while the other heavy metals are in a lower risk.According to the comprehensive contamination indexes,the heavy metals pollution in Park 1 belongs to a high grade,while the other parks are in little pollution level.

Objective To establish a gene diagnosis assay for spinal muscular atrophy(SMA) in children. Method Analysis of the survival motor neuron (SMN) gene in 19 SMA patients and in 21 normal controls were performed by using polymerase chain reaction - fragment length polymorphism (PCR - RFLP) method. Result Deletion of exon 7and 8 in SMNt gene were found in all 19 SMA patients, while no such changes were found in normal controls. Conclusion The SMNt gene exon 7 and 8 examine can be applied to SMA gene diagnosis, and the PCR- RFLP method have higher sensitivity and particularity to the SMA diagnosis.

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