Phage display is a widely used gene engineering high technology.Through the display of exogenous peptides or proteins fused specific coat protein on the surface of phages,it is possible to construct proteins or peptides libraries and screen interesting proteins,peptides and antibodies successfully.Most commonly used phage display technology is phagemid/helper phage system,in which helper phages are essential for the replication and assembly of phagemid particles.In this review,in combination with the newest research dynamic status,we summarize phagemid/helper phage double-genome system.We mainly emphasized the features and mutation mechanisms of different helper phages.We also made some prospects for the future directions,in the meanwhile,we also expect that our experience can provide some help for further maturity of the technology.

This article was aimed to study the correlation between iron content inCornus officinalis leaves and its yield as well as quality. The method of microwave digestion atomic absorption spectrophotometer was used to determine the content of iron element inCornus officinalis leaves. HPLC was used to determine the content of loganin and ursolic acid in fruits. Correlation analysis was made among the content of iron element, yield of fruits, loganin and ursolic acid in fruits. The results showed that iron element in leaves of different yield level cornus officinalis was different. It also had some correlation with yield and quality of fruits. It was concluded that the research can improve relations of source-sink inCornus ofifcinalis, adjust source-sink balance, guide farmers to master the period of spraying iron fertilizer, and increase production and quality ofCornus ofifcinalis.

ObjectiveTo investigate the relation of learning and memory with the expression of postsynaptic density 95 (PSD-95) in traumatic brain injury (TBI) rats in Morris water maze.Methods Forty adult male Sprague-Dawley rats were randomly assigned to the TBI group and control group.The TBI group was produced using the impact acceleration injury model.Morris water maze memory paradigm was used to assess the learning and memory function in both groups one week after injury.Protein electro-phoresis was used to observe the expression of PSD-95 1,3,7 d after TBI.ResultsCompared with the control group,the TBI group showed a longer latency in the Morris water maze after one week,significantly longer than the latency in the first three days after TBI.The quantification of PSD-95 in the hippocampus was gradually reduced at one week after TBI ( P ＜ 0.01 ).ConclusionTBI may decrease expression of PSD-95 in the hippocampus of the rats,as may be one of the mechanisms for impairments of learning and memory of rats.

AIM:To make a survey on people suffering trachoma in Gansu province, and to provide evidence for developing trachoma control and prevention therapy.
METHODS: We chose the zone on the basis of relative information. Provincial Office of Blindness Prevention carried out the survey in 3 counties including Tange Township of Wushan, Xiqu Township of Minqin and Hulinjia Township of Jishishan from October 14, 2013 to November 23, 2013. One hundred and fifty primary school students were selected, including 72 boys and 78 girls aging from 5a to 10a with the average age of 7. 5y. The targeted students received the fast trachoma assessment by the adoption of simplified trachoma classification system which was recommended by the World Health Organization.
RESULTS: No case of active trachoma, trachomatous trichiasis and corneal disease were examined among 150 students.
CONCLUSION: The rate of trachoma is low in Gansu province. But we still cannot get the conclusion that there is no epidemic of trachoma in Gansu. And we need to further expand the survey scope to correctly assess the trachoma case and to provide reliable evidence for trachoma prevention and control.

Trachoma, a contagious keratoconjunctivitis ( KC ) , caused by Chlamydia trachomatis infection, is rife in 57 countries in the world at present. The World Health Organization ( WHO) listed the global alliance to eliminate blinding trachoma by 2020 as one of top priorities of its blindness prevention in 1998. A simplified classification system for identifying and naming trachoma, designated by WHO, and the SAFE strategy based on community intervention were extended continuously in the world in 10 years since then. The trachoma prevalence trend has showed a change compared with that in the past. China has launched the blindness prevention action, aimed to eliminate blinding trachoma by 2016. In this paper, we reviews progress in diagnosis, treatment and epidemic of trachoma since the extension of the SAFE strategy.

To investigate the effects of metallothionein (MT) on isolated rat heart, 16 Wistar rats were randomly divided into 2 groups. In control group (group C), distilled water was injected intraperitoneally and 24 h later isolated hearts were perfused with Langendorff and stored at 4 degrees C for 3 h with histidine-tryptophan-ketoglutarate (HTK) solutions, and then isolated hearts were perfused for 2 h by Langendorff. In experimental group (group E), 3.6% ZnSO(4) was injected intraperitoneally, 24 h later isolated hearts were perfused by Langendorff and stored at 4 degrees C for 3 h with HTK solutions, and then the isolated hearts were perfused for 2 h with Langendorff. MT content, the recovery of hemodynamics, myocardial water content (MWC), lactate dehydrogenase (LDH) and creatine kinase (CK) leakage, adenosine triphosphate (ATP) and malondialdehyde (MDA) content, superoxide dismutase (SOD) activity, myocardial cell Ca(2+) content, Ca(2+)-ATPase activity of mitochondria ([Ca(2+)-ATPase](m)) and its Ca(2+) content ([Ca(2+)](m)), synthesizing ATP activity of mitochondria ([ATP](m)), and the ultrastructure of cells were examined. There were a significant increase in group E in hemodynamic recovery, ATP content, SOD activity, [Ca(2+)-ATPase](m) activity, [ATP](m) activity, and substantial reduction in MWC, LDH and CK leakage, MDA content, myocardial cell Ca(2+) content, [Ca(2+)](m) content, and the ultrastructural injury were obviously milder than that of group C. This study demonstrated that MT has protective effects on isolated rat heart.
Cardiotonic Agents/*pharmacology ; Creatine Kinase/*metabolism ; L-Lactate Dehydrogenase/metabolism ; Metallothionein/biosynthesis ; Metallothionein/*pharmacology ; Myocardium/*metabolism ; Myocardium/ultrastructure ; Random Allocation ; Rats, Wistar ; Superoxide Dismutase/metabolism ; Zinc Sulfate/pharmacology

Objective To explore the application of event-related potentials (ERP) by positive, negative, and neutral face expression images in the evaluation of mood disorders in brain traumatic patients.Methods ERP was tested by face expression images in 24 patients mainly with anxiety and depression symptoms (depression group) and 19 patients mainly with hostile and suspicion symptoms (hostile group), respectively.The findings were compared with those of the control group.Results There were no significant differences, between the depression group and the hostile group, on latencies and amplitudes of late positive potential (LPP) induced by the three types of face expression images, except the amplitude induced by negative face expression image.Compared with the control group, the latencies were extended and the amplitudes were lower in both depression and hostile groups.Within each group, the difference of latencies induced by the three images was not significant.The amplitudes induced by negative face expression image was higher than those induced by positive and neutral face expression images, with significant differences in the hostile group and the control group (P＜0.05) but not in the depression group.Conclusion Changes in latencies and amplitudes of LPP could be an objective indicator in the evaluation of mood disorders of brain traumatic patients.The LPP induced by negative face expression images could be more meaningful for patients mainly with anxiety and depression symptoms.

To evaluate the protection of proximal colon segment by analyzing blood supply disorder of proximal colon segment during laparoscopic proctosigmoidectomy(11 cases) in the Chaoyang Hospital of Capital Medical University. It is concluded that the disorder of blood supply of proximal colon segment during laparoscopic proctosigmoid surgery has two reasons. One is the anatomic factor of mesenteric vessels; the other is the inappropriate operative procedure. It is recommended that left colonic artery should be retained, and inferior mesenteric artery should be handled at a low level, thus, the risk of proximal intestine blood supply disorder caused by vascular anatomy variation can be reduced.
Colon, Sigmoid ; surgery ; Humans ; Laparoscopy ; methods ; Rectum ; surgery

Zuotai (gTso thal) is a typical representative of Tibetan medicines containing heavy metals, but there is still lack of modem safety evaluation data so far. In this study, acute toxicity test, sub-acute toxicity test, one-time administration mercury distribution experiment, long-term mercury accumulative toxicity experiment and preliminary study on clinical safety of Compound Dangzuo were conducted in the hope of obtain the medicinal safety data of Zuotai. In the acute toxicity test, half of KM mice given the lethal dose of Zuotai were not died or poisoned, and LD50 was not found. The maximum tolerated dose of Zuotai was 80 g x kg(-1). In the subacute toxicity test, Zuotai could reduce ALT, AST, Crea levels in serums under low dose (13.34 mg x kg(-1) x d(-1)) and medium dose (53.36 mg x kg(-1) x d(-1)), with significant difference under low dose, and increase the levels of ALT, AST, MDA, Crea in serums under high dose (2 000 mg x kg(-1) x d(-1)); besides, the levels of BUN and GSH in serums reduced with the increase in dose of Zuotai, indicating a significant dose-effect relationship. In the one-time administration distribution experiment, the content of mercury in rat kidney, liver and lung increased after the one-time administration with Zuotai, with a significant dose-dependent relationship in kidney. In the long-term mercury accumulative toxicity experiment, KM mice were administered with equivalent doses of Zuotai for 4.5 months and then stopped drug administration for 1.5 months. Since the 2.5th month, they showed significant mercury accumulation in kidney, which gradually reduced after drug withdrawal, without significant change in mercury content in liver, spleen and brain and ALT, AST, TBIL, BUN and Crea in serum. At the 4.5th month after drug administration, KM mice showed slight structural changes in kidney, liver and spleen tissues, and gradually recovered to normal after drug withdrawal. Besides, no significant difference in weight gain was found between the Zuotai group and the control group. According to the findings of the clinical safety study of Dangzuo, after subjects administered Dangzuo under clinical dose for one month, their serum biochemical indicators, blood routine indicators and urine routine indicators showed no significant adverse change. This study proved that traditional Tibetan medicine Zuotai was slightly toxic, with a better safety in clinical combined administration and no adverse effects on bodies under the clinical dose and clinical medication cycle. However, long-term high-dose administration of Zuotai may have a certain effect on kidney.
Adult ; Animals ; Clinical Trials as Topic ; Drugs, Chinese Herbal ; analysis ; pharmacokinetics ; toxicity ; Female ; Humans ; Kidney ; drug effects ; Liver ; drug effects ; Male ; Medicine, Tibetan Traditional ; Mice ; Middle Aged ; Rats ; Rats, Wistar ; Young Adult

OBJECTIVETo investigate the influencing factors for psychological and behavioral problems in school-age twins and to provide a basis for reducing the incidence of these problems.

METHODSThe psychological and behavioral problems were assessed in 147 pairs of twins aged 6-12 years in Huhhot, China, using the Achenbach Child Behavior Checklist (CBCL). The Family Adaptability and Cohesion Evaluation Scales and Family General Condition Questionnaire were used to collect data.

RESULTSThe overall detection rate of psychological and behavioral problems in these children was 24.1%; the detection rate of thought problems (15.3%) was the highest, and the detection rate of physical discomforts (3.4%) was the lowest. According to the multiple logistic regression analysis, full-term birth or not was significantly associated with withdrawn behavior and total score on the CBCL (P<0.05); temperament type was significantly associated with thought problems and overall detection rate of psychological and behavioral problems (P<0.05); father's child-bearing age was significantly associated with thought problems (P<0.05); family cohesion was significantly associated with discipline violation (P<0.05); family adaptability was significantly associated with thought problems (P<0.05); family rearing patterns were significantly associated with socialization problems (P<0.05).

CONCLUSIONSChildren's temperament type, full-term birth or not, father's child-bearing age, family cohesion, family adaptability, and family rearing patterns are the main influencing factors for the psychological and behavioral problems in school-age twins.

Child ; Child Behavior Disorders ; etiology ; Female ; Humans ; Logistic Models ; Male ; Problem Behavior ; psychology ; Twins ; psychology