A high Streptolydigin-producing strain Streptomyces lydicus AS 4.2501-L8 with genetic stability was obtained from the original strain S. lydicus AS 4.2501-P28 by mutagenesis with UV and acridine orange, followed by resistance selection. Its yield of Streptolydigin was 177.0 ?g/mL, 96.2% higher than the original strain.

Aged ; Female ; Fibroma ; pathology ; Fibroma, Ossifying ; pathology ; Gingival Neoplasms ; pathology ; Humans

The authors explained the process of organizing and implementing of the designed experiments.The designed experi- ments can improve students' creative thinking ability and activate students'initiative and meanwhile,it can improve teachers' level and contribute to making progress in teaching and studying although there are still some problems to solve.

OBJECTIVETo examine the effects of Han's acupoint and nerve stimulator (HANS) electroacupuncture on the expression of NPY in periaqueductal grey (PAG) of heroin addicted rats.

METHODSHeroin was injected subcutaneously according to the principle of daily increasing dose in rats of experimented group. The ability of special learning and memory were tested by Morris water maze; The expression of NPY in PAG of rat were detected by immunohistochemistry.

RESULTS(1) Escape latency and searching distance in heroin-addiction group were significantly increased compared with those of normal group during the place navigation test (P < 0.05). However, in acupuncture group, escape latency and searching distance was obviously shortened compared with those of heroin-addiction group (P < 0.05). The exploring time and distance of original platform area in proportion to the total distance in heroin-addiction group significantly decreased compared with those of normal group during spatial probe test (P < 0.05). The exploring time and distance of original platform area in proportion to the total distance in acupuncture group was increased compared with those in heroin-addiction group (P < 0.01). (2) The expression of NPY of heroin-addiction group was lower than that in normal group in PAG, while those of acupuncture group was higher than that in the heroin-addiction group (P < 0.05).

CONCLUSIONThe learning and memory induced by heroin-addiction could be reversed and the expression of NPY in PAG was increased by HANS in rats.

Animals ; Electroacupuncture ; Heroin Dependence ; metabolism ; Male ; Maze Learning ; Memory ; Neuropeptide Y ; metabolism ; Periaqueductal Gray ; metabolism ; Rats ; Rats, Wistar

Objective To look for the genes of Schistosoma japonicum related to the Schistosoma-resistance of Microtus fortis.Methods The fresh sera of Microtus fortis were used to screen a T7 phage display cDNA library from worms of Schistosoma japonicum established in our lab.The positive clones were sequenced and functionally analysed through bioinformatics.Results The specific phages binding to the sera of Microtus fortis were enriched 857-fold after three rounds of biopanning,and 58 positive clones picked at random were sequenced and 10 ESTs were obtained.BLASTn results showed that 7 ESTs had 99%-100% similarity to the genes of Shistosoma japonicum reported in GenBank and 1 EST had 82% similarity to a zinc finger protein encoden gene from Pan troglodytes.The results of these ESTs function prediction indicated most of them were involved in the regulation of gene expresion of Schistosoma japonicum.Conclusions Several target genes of Schistosoma japonicum related to the Schistosoma-resistance of Microtus fortis are obtained and those would lay foundation to expatiate the native resistance mechnism of Microtus fortis to Schistosoma japonicum.

Objective To investigate whether gastroesophageal reflux can cause asthma-like pathophysiological changes and its mechanism.Methods Sixty BALB/c mice were randomly divided into 4 groups:group A was gastroesophageal reflux control group,group B was asthma control group,group C was gastroesophageal reflux group,and group D was asthmatic group.The asthmatic models were replicated with ovalbumin(OVA) and aluminum hydroxide,and gastroesophageal reflux models were replicated with hydrochloric acid solution pepsin.After the last inhaling ovalbumin and slow perfusion,the airway pressure was detected,and eosinophil (EOS) and neutrophil granulocyte in bronchial lavage fluid were counted.The flow cytometer was used to determinate IL-4,IFN-γ,and Th1/Th2 ratio changes of spleen cells;Lung tissue and esophagus sections were stained with HE,and pathological changes of lung tissue and esophagus were observed.Results In group C and group D,the airway hyper-responsiveness was significantly increased compared with group A and group B,and the differences were statistically significant (all P ＜ 0.05).In group C and group D,IL-4were significantly increased,while IFN-γand Thl/Th2 ratio were significantly decreased than that in the group A and B group,the differences were statistically significant (all P ＜ 0.05).EOS of group C and group D accounted for a high percentage of total cells and they were significantly higher than that in group A and group B,and the differences were statistically significant (all P ＜ 0.05).Through lung tissue biopsy,in group C and group D,bronchial lumen deformation,infiltration of inflammatory cells around the wall,basement membrane thickening,inflammatory cell infiltration around the wall,peripheral vascular edema,enlarging alveolar cavity,alveolar wall thinning,fracture,part of alveolar fusion into bullace of lung,could be observed.The lung pathological section showed that the endothelial cells in group A and group B were integrated and had no denaturation or necrosis,and there was no inflammation cell infiltrate around.EOS biopsy could be observed in group A and group B of lower esophagus markedly submucosal edema,submucosal inflammatory cell infiltration,and keratin hyper function,visible bacteria group A group B and group D were basic ally normal,with no pathological changes.Conclusions Gastroesophageal reflux can induce Th1/Th2 decreasing,airway hyper-responsiveness and pathophysiological changes similar to asthma.

Objective To explore the content of the psychological contract of pregnant nurses and analyze the main reasons resulting in the recessive loss of pregnant nurses, in an attempt to put forward a management strategy about pregnancy nurses. Methods Totals of 30 pregnant nurses and 15 nurse managers were randomly selected and interviewed to formulate the content of the psychological contract of pregnant nurses. Thereafter, the content was perfected by Delphi method to ensure the main psychological contract factors influencing the recessive loss of the pregnancy nurses. Results The content of the psychological contract of pregnant nurses included 12 factors of management responsibility ( posts of duty, workload, working atmosphere, bonus distribution, social welfare, education and training, opportunity to display the ability, promotion opportunity, respect for dignity, caring about the daily life of pregnant nurses, psychological comfort, pregnancy health care) and 11 factors of pregnant nurses responsibility ( fulfillment of duties, abidance by rules, rigorous thinking, enthusiasm for work, professional knowledge and skills, insist on the job, acceptance to the assignment, report for sick leave, interests of the hospitals, hospital image and development with the hospital) . Conclusions This index models a useful and reliable method to assess the psychological contract of pregnant nurses and can provide a guidance to reduce the recessive loss rate of pregnant nurses.

Multi-central randomized controlled method was used to scientifically verify indications of 33 acupoints and provide definite clinical basis for the indications of single acupoint. Of the 52 studies, 40 studies showed that the therapeutic effect in acupuncture observation groups were better than the control group; 11 studies showed similar therapeutic effect of the two groups, and 1 study showed the acupuncture observation group was worse than the control group. Therefore, results indicate that in a certain observation cycle, acupuncture at single acupoint have different effects on diseases.
Acupuncture Points ; Humans ; Randomized Controlled Trials as Topic

Aim To explore the mechanism of the effect of rosiglitazone(Rsg)on the pancreatic cancer in diabetic mice based on the impact of PPARγ on glu-cose transport and metabolism.Methods A high-fat and high sugar diet combined with STZ was used to construct T2DM model;T2DM mice and normal mice were subcutaneously injected with PANC02 cells to construct a transplanted tumor model.T2DM trans-planted tumor mice and normal transplanted tumor mice were divided into the following groups:Rsg,PPARy inhibitor(PIN-2),rosiglitazone+PPARγ in-hibitor(Rsg+PIN-2),and normal transplanted tumor mice(NDM)and T2DM transplanted tumor mice(DM)were used as control groups,respectively.Tis-sue samples were collected after intervention.Tissue pathological changes were observed by HE staining.The expressions of Ki67 and PCNA proteins were de-tected by immunohistochemistry.Cell apoptosis was detected by TUNEL assay.The expression of PPARγwas detected by immunofluorescence.The expressions of Glucokinase,GLUT2,Nkx6.1,PDX-1RT-PCR were determined by Western blot.Results Rsg could significantly reduce the tumor mass,pathological chan-ges,Ki67 and PCNA expression of transplanted tumors(P＜0.05),increase cell apoptosis and the expression of PPARγ,Glucokinase,GLUT2,Nkx6.1,PDX-1 proteins in NDM and DM mice(P＜0.05).PIN-2 could reverse the indicator changes caused by Rsg in NDM and DM mice.However,compared with NDM mice,the above related indicators of the DM group mice were more sensitive to Rsg and PIN-2.Conclu-sions Compared to non-diabetic pancreatic cancer,rosiglitazone can more sensitively inhibit the prolifera-tion of pancreatic cancer with T2DM,induce apopto-sis,and reprogram the metabolism of pancreatic cancer with T2DM by activating PPA Rγ and altering the ex-pression of glucose and lipid metabolism genes,there-by exerting an anti-cancer effect.

Objective To evaluate the efficacy of one-stop hybrid coronary revascularization [simultaneous minimally invasive direct coronary artery bypass surgery (MIDCAB) and percutaneous coronary intervention (PCI) procedures performed in an enhanced (or called "hybrid") operative unit] for the treatment of unprotected left main coronary artery (ULMCA) disease. Methods From June 2007 to April 2009, 14 patients [13 male, mean age: (60.4±15.4) years] underwent the one-stop hybrid approach in the "hybrid" operating room. Proximal lesions were evidenced in 5 patients and distal or bifurcation lesions in 11 patients. MIDCAB procedure for grafting of the left intramammary artery (LIMA) with the left anterior descending (LAD) artery was first performed via lower partial ministernotomy on the beating heart, followed by PCI on the LMCA disease and non-LAD coronary lesions. Results Operation was successful in all patients underwent the one-stop hybrid procedure. LIMA grafts were used in all 14 patients and confirmed to be patent by angiography. A total of 25 non-LAD coronary lesions were treated by PCI and 29 stents (27drug-elutiag stents and 2 bare-mental stents) were implanted to 23 lesions and coronary angioplasty was performed in the remaining lesions. There was no death, perioperative myocardial infarction, stroke or repeat revascularization during the procedure and the follow-up period. All the patients remained free from angina during the 7.9 months (range 1-15 months) follow-up period. LIMA grafts and stents were patent in 5 patients at 1-year follow-up. Conclusions Our initial experience demonstrates that one-stop hybrid coronary revascularization provides a reasonable, feasible and safe alternative for selected patients with LMCA diseases.