In term of innovating in teaching,the text proposes some rectification and improvement measures according to the weak point existing in the chemical experiment in the past.We have improved the teaching quality of the chemical experiment through improving teacher's innovative quality,adjusting the experiment content rationally,changing the teaching mode of the experiment and examining method,and optimizing the experiment means,etc.

OBJECTIVE:To extract and identify the volatile components of the roots of Polyalthia nemoralis,and to evaluate its biological activity in vitro. METHODS:Supercritical CO2 extraction (SFE-CO2) was performed to extract volatile compounds from the roots of P. nemoralis,and the volatile components were separated and determined by GC-MS. Human hepatic cancer Huh-7 cells were cultured with 0(blank control),5,10,20,30,40 and 50 μg(medicinal material)/ml extract for 24 h,and then MTT assay was used to detect the inhibitory effect of the extracts on cells. Relative cell viability and IC50 were calculated. The an-ti-bacterial activities of extract to Staphylococcus aureus,Methicillin-resistant Staphylococcus aureus,Enterococcus faecalis and oth-er strain were determined by Kirby-bauer method and broth dilution method. RESULTS:Forty compounds were identified from the SFE-CO2 extracts from the roots of P. nemoralis. The main constituents were(Z,Z,Z)-9,12,15-octa-decatrien-1-ol,glycerin,cinna-maldehyde,n-hexadecanoic acid and eugenol. Compared with blank control group,SFE-CO2 extracts from the roots of P. nemoralis 5 μg(medicinal material)/ml and above showed significant inhibitory effect on cell growth(P<0.05),and the inhibitory effect was strengthened as the concentration of extracts increased,IC50 values was 5.2 μg(medicinal material)/ml. However,the supercritical extract didn't showed antibacterial activity against three microorganisms in 2 kinds of antibacterial tests. CONCLUSIONS:SFE-CO2 and GC-MS method can effectively extract and identify volatile components of the roots of P. nemoralis,and supercritical extracts can inhibit the viability of cells but have no antibacterial activity.

Myeloid-derived suppressor cells (MDSCs) are a heterogeneous group of immunosuppressive cells derived from bone marrow stem cells.MDSCs can not only strongly inhibit the anti-tumor immune reactions mediated by T cells,but also directly accelerate angiogenesis,tumor progression and metastasis.Nonresolving inflammation (NRI),a major driving factor in the occurrence and development of tumor,and MDSCs are present in tumor microenvironment and become hot topics in recent years.However,the relationships between MDSCs and NRI,especially in the relevant molecular regulatory networks,have not been fully elucidated.The relationships between MDSCs and NRI,the molecular regulatory networks,the key regulatory points and the strategies for targeted treatment are reviewed in this paper based on the current literatures and the work achieved by our research team.

OBJECTIVE:To investigate the distribution and drug resistance of Acinetobacter baumannii in our hospital,and provide reference for rational use of antibiotics. METHODS:Clinical specimen of inpatients in our hospital from Jan. 2012 to Dec. 2015 was collected,the identification of strains and drug sensitivity test were performed by the VITEK-2 microorganism analyzer;use rate of antibiotics and detection of multidrug-resistant and pandrug-resistant A. baumannii for inpatients in our hospital were an-alyzed,and their correlation was detected by Pearson correlation analysis. RESULTS:Totally 2 468 strains of A. baumannii were isolated in our hospital during 2012-2015,mainly derived from sputum samples (88.2%),distributed in respiratory medicine de-partment(47.0%)and ICU(13.1%);A. baumannii showed totally high drug resistance to common antibiotics,and only sensitive to tigecycline. Totally 386(79.3%),434(61.6%),358(53.4%)and 291(48.0%)strains multidrug-resistant A. baumannii were detected every year in our hospital;and pandrug-resistant A. baumannii were 336(69.0%),385(54.7%),331(49.3%)and 256 (42.2%) strains,respectively. There was a positive correlation between the percentage of multidrug-resistant and pandrug-resistant A. baumannii in total strains and use rate of antibiotics (r=0.987、0.981,P<0.05). CONCLUSIONS:A. baumannii has emerged as an important pathogen in hospital acquired infections,which mainly caused respiratory system infection;the drug resistance situ-ation is not optimistic,tigecycline can be used as one of the best choice for treatment of A. baumannii infections;our hospital should continue to control the use of antibiotics to decrease the emerging of drug resistance strains.

Objective To evaluate the impact of ghrelin on depleted uranium ( DU)-induced damage of the osteoblast MC3T3-E1. Methods MC3T3-E1 cells were treated with different doses of ghrelin for 1 h before DU (500 μM) treatment. After 24 hours,the cell via-bility,intracellular tartrate-resistant acid phosphatase (StrACP),alkaline phosphatase (AKP),osteoprotegerin (OPG),solvable receptor acti-vator of nuclear factor-κB ligand ( sRANKL) ,catalase ( CAT) and reactive oxygen species ( ROS) were measured. Results After DU expo-sure,ghrelin pretreatment increased the cell viability and CAT levels,and reduced intracellular StrACP,AKP,sRANKL/OPG and ROS in a dose-dependent manner. Conclusion Through maintaining the balance of OPG/RANKL and reducing the oxidative stress,ghrelin could pro-tect against DU-induced damage of MC3T3-E1 cells.

Objective To harvest pancreatic tissues from rats , prepare decellularized bio-derived pancreatic scaffolds ( DBPS) , and to examine the integrity and biocompatibility of the scaffolds .Methods Normal pancreases were harvested from healthy adult SD rats .DBPS was prepared by perfusing SDS and Triton X-100 through bile duct and the portal vein, respectively.After decellularization, normal pancreatic tissue and DBPS were compared via HE staining , and transmission electron microscopy ( TEM ) . Abdominal wall and subcutaneous implantations were used to compare biocompatibility , and the remain quantity of residual protein and growth factors were determined via enzyme linked immunosorbent assay(ELISA).MTT assay was used to test the scaffolds’ cytotoxicity.The scaffolds were co-cultured with endotheliocyte .Results HE staining and TEM study indicated no residual cells in the DBPS as well as preservation of the complete extracellular matrix .The remain quantity of residual protein and growth factors in ECM was high .The abdominal wall and subcutaneous implantation revealed that DBPS triggered a lower immune response as compared to the control group.MTT assay showed little cytotoxicity .Endotheliocyte assembled and growed with the scaffolds together .Conclusion DBPS are completely decellularized , and exhibit a higher level of biocompatibility in vivo.Using the way of vessels can make the integrity of extracellular matrix to be fully preserves and contain more growth factors .So using vessels way is better than bile duct .

Objective To investigate the effect of acupuncture at Zusanli, Sanyinjiao and Danzhong on mammary estrogen receptor (ER) and progesterone receptor (PR) expressions in rats with dimethylbenzanthracine (DMBA)-induced mammary cancer. Methods One hundred and twenty female SD rats aged 6-8 weeks were randomized into a model group of 60 rats and a blank group of 30 rats. The model group received an oral gavage of DMBA for model making. The blank group received an oral gavage of equal volume of sesame oil. At 15 weeks after model making, the model group of rats was randomized into treatment and control groups. The treatment group received acupuncture at Zusanli, Sanyinjiao and Danzhong, and the control and blank groups, only the same grasp and release. After the completion of acupuncture treatment (twenty-seventh week), abdominal venous blood was taken and serum tumor markers were determined by electrochemiluminescence immunoassay. Tumor masses were counted and their shapes were recorded. The mass was taken and its height, maximum diameter and vertical diameter were measured using a 1 mm precision vernier caliper. Pathological changes in tumor tissues, and ER and PR positive areas and mean optical densities were observed under an Olympus optical microscope.Results There were statistically significant post-treatment differences in the average number and volume of mammary tumors between the treatment group and the control or blank group (P<0.01,P<0.05) and between the control and blank groups (P<0.01). There were statistically significant post-treatment differences in the concentrations of various tumor markers (CA724, CA125, CA199, AEP, CA15-3, CEA and CA50) between the treatment or control group and the blank group (P<0.01,P<0.05) and between the control and blank groups (P<0.01). There was a statistically significant post-treatment difference in CA15-3 concentration between the treatment and control groups (P<0.01). There were statistically significant post-treatment differences in ER and PR positive areas and mean optical densities between the treatment group and the control or blank group (P<0.01) and between the control and blank groups (P<0.01).Conclusions Acupuncture can reduce the occurrence of rat DMBA-induced mammary tumor (including the number and volumes of the tumors). The mechanism of its action may be related to decreasing the concentrations of tumor markers CA724, CA125, CA199, CA15-3, AEP, CEA and CA50 and especially to decreasing CA15-3 concentration, and ER and PR positive areas and mean optical densities.

Objective To investigate the clinical application value of retroperitoneal laparoscopic nephrectomy for nonfunctioning kidney.Methods Fifty-four cases of retroperitoneal laparoscopic nephrectomy for nonfunctioning kidney were reviewed,including 9 cases with nonfunctioning tuberculosis pyonephrosis,18 cases with infection nonfunctioning pyonephrosis and 27 cases of nonfunctioning hydronephrosis.Fifty-four cases were received retroperitoneal laparoscopic nephrectomy,tuberculous and infection pyonephrosis underwent laparoscopic resection surrounding adipose capsule,nonfunctioning hydronephrosis underwent laparoscopic resection by pumping water to increase the peritoneal space.Results The operation of 54 cases were perfomed successfully.None of the patient required conversion to open surgery.During the surgery,1 case showed mild extravasation of cheese-like pus induced by laceration of the kidney capsule;2 cases had injuried on the peritoneum.The mean operation time was 125 (95-230) min,the mean blood loss was 84 (50-420) ml.All patients showed primary healing of the wound,the patients were discharged from the hospital in 6 to 11 d (mean 7.5 d).After followed up for 5-27 months,none of them had long-term complication.Conclusions Retroperitoneal laparscopic nephrectomy for nonfunctioning kidney has advantages of minimal invasion,less blood loss and quicker recovery,so it is a fairly safe and effective procedure for nonfunctioning kidney.

Objective To explore the characteristics of oxygen uptake efficiency (OUES) in patients with obstructive sleep apnea hypopnea syndrome (OSAHS) and analyze the relationship between OUE and severity of disease.Methods Pulmonary function test,polysomnogram and cardiopulmonary exercise testing were performed in 35 patients with OSAHS and 25 age-matched healthy volunteers.Their successive breathing respiratory exchange parameters were collected and analyzed.And t and x2 tests were used for 2 sample comparison.Correlation analysis was performed by Pearson correlation test.Results Significant differences in peak VO2 and peak VO2 ％ pred existed between OSAHS and normal control groups [(18±4) vs.(28 ±6) L/min,P＜0.01;(68±14) vs.(84±16) ％,P＜0.01].Compared with normal control group [(2.3 ±0.5) L · min-1 · lg-1 ; (36 ±4) ml/L; (36 ±4) ml/L],OUES,OUEP and OUE@AT of OSAHS group [(1.8 ± 0.4) L · min-1 · lg-1 ; (31 ± 5) ml/L; (30 ± 5) ml/L] were significantly lower (t =3.78-4.49,all P ＜0.01).And OUES,OUEP and OUE@AT in OSAHS patients were correlated (r =0.53-0.67,all P ＜0.01) positively with exercise tolerance (peak VO2％ pred) while negatively with apnea hypopnea index (AHI) (r=-0.67--0.54,all P ＜0.01).Conclusion The oxygen uptake efficiency of patients with OSAHS is significantly reduced compared to that of normal subjects.And it is correlated negatively with severity of disease.

AIM:To investigate the effects of seipin gene deficiency on renal injury and the possible mecha-nisms in seipin-/-mice.METHODS:Six-month-old male seipin knockout ( seipin-/-) and wild-type ( WT) mice ( n=8) were used to study 24 h urinary albumin excretion ( UAE) , renal functions, pathological changes, and plasma leptin and adiponectin levels.Seipin mRNA expression in different tissues and each part of the kidney was also measured in WT mice.RESULTS:Real-time PCR analysis showed seipin mRNA expression in WT mice was higher in adipose tissue and testicles, and was also found in the kidney, which was mainly in glomeruli.Compared with control group, seipin-/-group showed increased kidney weight/tibia length (P<0.01), 24 h UAE (P<0.01), creatinine clearance (P<0.01), and glomerular and mesangial surface area (P<0.05).Both plasma leptin (P<0.01) and adiponectin (P<0.05) levels were significantly decreased in seipin-/-mice.CONCLUSION:Seipin gene deficiency in mice leads to renal injury prob-ably by decreasing plasma leptin and adiponectin levels due to lack of adipose tissue.