Based on the lethal rate, positive and negative mutation rate, the optimal doses of UV, HNO2, UV + AO treating S. hygroscopicus NND-52-29 were determined. The mutant strain A19 that was obtained showed the derepres-sive property to glucose and the nigericin yield of A19 could be increased by 128%. When it was subcultured combined with natural screening, its stability was rather satisfied.

Objective To construct a suppression subtractive hybridization (SSH) library of human renal cell carcinoma. Methods Poly A + RNA was isolated from human renal cell carcinoma (RCC) tissues and matched normal kidney tissues, respectively. Then double strand cDNA were synthesized and restricted by Rsa I.RCC cDNA were divided into two groups and ligated with either adaptor 1 or adaptor 2.After RCC cDNA hybridized with normal kidney cDNA twice and underwent nested PCR,the PCR products were cloned into pT Adv vector and transformed E.coli TOP10F′.Some positive clones randomly picked up were digested and sequenced. Results The SSH library contained 414 positive clones. Random analysis of 265 clones with enzyme restriction showed that 246 clones contained cDNA fragments which were distributed mainly between 300～900 bp. Among 40 arbitrary clones derived from the above 246 clones, No.170 clone is a previously unknown sequence and the other 39 clones were derived from 35 known genes. Conclusions The quality of the SSH library of human RCC is reliable and its construction would lay the foundation for further screening differentially expressed genes in RCC.

pcDNA3.1/Hygro(-)+pCMV?. Conclusions Transactivation competence of genotype B HBx was higher than that of genotype C HBx, while the antiproliferative and apoptosis effects of genotype B HBx was lower than of genotype C HBx. B and C genotype-specific functional differences of HBx may closely co-related with the pathogenicity of HBV.

Child ; Humans ; Pneumonia ; diagnosis ; etiology ; Recurrence

BACKGROUND: Embryonic stem cells (ESCs), the seed cells of all mature cells in vivo, are useful tools for nerve transplantation and developmental gene function research. Notch1 signaling pathway is the key pathway to control the ordered neural development and differentiation of many kinds of neural cells, however, there is no report on the dynamic expression of Notch1 signal during the ESC differentiation to date. OBJECTIVE: To investigate the expression of Notch1 protein, transmembrane signal transduction molecule, during directional differentiation of embryonic stem cells into neural cells. DESIGN, TIME AND SETTING: Cell research was carried out between October 2003 and October 2004 at Zhongshan Ophthalmic Center, SUN Yat-sen University, Guangzhou, Guangdong Province, China. MATERIALS: BALB/C mouse embryonic stem cell line Ⅵ (passage 11)was obtained from experimental animal center of SUN Yat-sen University, provided by professor Huang Bing. ESC culture medium was high-glucose DMEM medium with 20% bovine serum and 106 IU/L mouse leukemia inhibitory factor. Induced differentiation medium was high-glucose DMEM medium with 20% fetal bovine.serum and 5×107 mol/L retinoid acid(RA). METHODS: Passage 11 ESCs were resuscitated and incubated by ESC culture medium in incubator at 37℃ with 5% CO2. Passage 11 ESCs were subcultured after 2 or 3 days and RA was added into medium to induce differentiation. Three time points for observation were established: induced for 1, 5 and 9 days. MAIN OUTCOME MEASURES: Morphological changes were observed under inverted phase contrast microscope, MAP-2 antigen expressed in differentiated cells was detected by immunofluorescence method. Immunocytochemistry, Western Blot, flow cytometry assay were used to investigate the Notch1 protein expression. RESULTS: ESCs presented clone-like growth. After induced by RA for 9 days, single neural network was achieved around most of the cell clusters. With the prolongation of induction, MAP-2 positive neural cells increased gradually. Almost all ESC clones expressed Notch1 protein strongly or positively, but Notehl protein expression decreased gradually after induced differentiation (P < 0.01). CONCLUSION: Notch1 signal shuts off progressively during induction of ESCs into neural cells, which suggests Notch1 may play an important role in the differentiation of ESCs into neural cells.

Objective To study image findings of nonossifying fibroma.Methods The pathological and image findings fo 22 cases of nonossifying fibromas proved by operation were analysed.There were 12 cases of male and 10 cases female,with age ranging from 10 to 35 years(mean age 17 years).X-ray plain films were obtained in all 22 cases,CT images in 7 cases,and MRI in 2 cases.Results The tumors were located in long bone in 19 cases,in which 14 cases were located in metaphyses,2 cases in diaphyses and 2 cases in bone end,and 4 cases in irregular bone,which was seen in clavicle,rib,illum and maxilla respectively.The tumor maximum diamneter ranged from 2 to 6.5 cm,with mean diameter of 3.2 cm,and the ratio of longitudinal to transverse diameter was 2.51.The tumors were round,oral or mild lobular in 17 cases.The tumors were showed sclerotic borders in 20 cases,and no sclerotic border in 2 cases(clavicle and rib).Septum was demonstrated in 19 cases.Bone expasion was showed in one case.Conclusion If a tumor is located in cortex or marrow of long or irregular bone which is showed a welldefined lytic lesion with sclerotic rim,the diagnosis of nonossifying fibroma will be considered.

OBJECTIVE To give an overview of our hospital′s actual infection situation and provide scientific data for nosocomial infection management.METHODS With a cross-sectional study,the infection rate was investigated.RESULTS The infection rate was 2.39%,and the most common infection site was lower respiratory tract(50.00%);the department of neurosurgory was with the highest infection rate;the risk factors for NI included: respiratory ventilator,tracheotomy,blood vessel catheter and indwelling catheter.CONCLUSIONS The departments with the higher infection rate should be given enhancing surveillance.Cleaning and antisepsis of environment,procedures of aseptico skills,compliance of washing hands and antibiotics management should be strengthened.

Objective To investigate the clinical significance of BiPAP mechanical ventilation in the treatment of chronic obstructive pulmonary disease(COPD)with type Ⅱ respiratory failure.Methods A total 56 patients suffering from respiratory failure due to exacerbation of COPD were randomly divided into treatment group (BiPAP plus routine therapy)and control group(routine comprehensive therapy).Blood gases,respiratory rates,heart rates,scores of the activity of accessory respiratory muscles,incubation rate,fatality rate were observed.Results In the treatment group,PO2 greatly increased,PCO2 greatly decreased,pH improved significantly,and respiratory rate,heart rate and scores of the activity of accessory respiratory muscles greatly decreased.The incubation rate and the fatality rate were significantly lower in the treatment group than those in the control group(P＜0.05).Conclusion BiPAP mechanical ventilation plus routine therapy on COPD with type Ⅱ respiratory failure can improve the curative effects,lessen respiratory muscle fatigue,and decrease the need for incubation and fatality rate.

Objective To explore the factors relating to serum lutein level in elderly patients with early age-related macular degeneration (AMD).Methods 102 early AMD patients diagnosed by international diagnostic criteria were selected.The level of serum lutein was measured by HPLC,and dietary intake was estimated by food-frequency questionnaire (FFQ).The factors relating to serum lutein level were analyzed by Pearson correlation and multiple regression analysis models.Results Serum lutein level was higher in female AMD patients than in male AMD patients [(0.33±0.31) μmol/L vs.(0.21 ±0.19) μmol/L,t=2.21,P＜0.05].Serum lutein level was positively correlated with dietary lutein (r=0.49,P＜ 0.001),but not correlated with age,BMI,and other nutrient intake after adjustment for caloric intake.Dietary lutein was mainly from corn,spinach,leeks,eggs,chrysanthemum,pumpkin,broccoli,lettuce,asparagus and peas.Intakes of spinach,pumpkin,asparagus were significantly associated with serum lutein level.Conclusions Elderly patients with AMD should increase the intakes of lutein-rich vegetables to increase the serum lutein level.

Objective To observe the effect of ephedrine combined propofol and fentanyl in painless induced abortion.Methods Eighty cases of patients (ASA Ⅰ) who apply painless induced abortion were randomly divided into two groups:observation group and control group,each group with 40 cases.Both of the groups were given fentanyl 1 μ g/kg and propofol 2 mg/kg with 2 mg/ml lidocaine; then observation group was given 0.08-0.15 mg/kg ephedrine according to the blood pressure.The heart rate,blood pressure and pulse oximetry (SpO2) of preinduction,3 min and 5 min after induction and 3 min after surgery and the recovery time was observed.Results There was no significant difference about heart rate,blood pressure and SpO2 preinduction,but there was significant difference on 3 min and 5 min after induction in control group in contrast to preinduction [(69.80 ± 7.08),(65.18 ± 5.16) times/min vs.(83.65 ± 8.12)times/min and (86.65 ± 8.60),(90.73 ± 8.35) mmHg (1 mmHg =0.133 kPa) vs.(128.45 ± 11.83) mmHg] (P ＜ 0.05),while observation group kept stable; there was no significant difference about SpO2 and recovery time in both groups.Conclusion It is safe and effective to use ephedrine combined propofol and fentanyl in painless induced abortion.