A dynamic test on externally prestressed simply supported concrete beams separately with three typical types of tendon distributions was conducted. The results show that the natural frequencies of the beams increase with the increase in the prestressing force at the tensioning stage, and the natural frequencies decrease after the cracks occur in the beams. Following the calculation formula of natural frequency of externally prestressed beam, which was reported in a literature, the natural frequencies of the experimental beams are calculated, and big errors are found between the test results and the calculated ones of natural frequency values. As a result, this paper has tried to adopt two methods to correct the rigidity parameter of the concrete beam in the formula for natural frequency calculation, and to use the corrected formula to calculate the frequencies of the experimental beams. The calculation results indicate a good consistency with the experimental ones, which verifies the feasibility of the corrected formula.

A dynamic test on externally prestressed simply supported concrete beams separately with three typical types of tendon distributions was conducted. The results show that the natural frequencies of the beams increase with the increase in the prestressing force at the tensioning stage, and the natural frequencies decrease after the cracks occur in the beams. Following the calculation formula of natural frequency of externally prestressed beam, which was reported in a literature, the natural frequencies of the experimental beams are calculated, and big errors are found between the test results and the calculated ones of natural frequency values. As a result, this paper has tried to adopt two methods to correct the rigidity parameter of the concrete beam in the formula for natural frequency calculation, and to use the corrected formula to calculate the frequencies of the experimental beams. The calculation results indicate a good consistency with the experimental ones, which verifies the feasibility of the corrected formula.

Objective To provide information support for military medical service drilling with actual arms in field medical clinic. Methods The local netwok was built based on Intranet mode for military medical service. A distributed wartime military medical service information system was developed. The long-range consultation was carried through a consultation vehicle. The field medical clinic information system was integrated with No.1 Military Medical Project. Results The system has been used in drilling with actual arms of field medical clinic for three years. Conclusion The result shows that the system can satisfy the need of information management of field medical clinic and enhanced the efficiency of management greatly.

AlM:To evaluate the expression of transcriptional factor lslet-1 in retina in experimental retinal neovascularization induced by oxygen.
METHODS: The murine retinal neovascularization were induced by hyperoxia exposure. The morphological observation of retinal neovascularization was performed using angiography by fluorescein dextran injection under the fluorescence microscope, and the new blood vessels were quantified after 5d in room air (17-day-old) by counting the vascular epithelial cell nuclei protruding into viteous cavity using HE stain. Realtime PCR and Western blot were used to examine retinal lslet-1 level in postnatal 7,12, 14,17 and 26d respectively.
RESULTS: A lots of new blood vessels were demonstrated in the mouse retina in hyperoxic group by fluorescein angiography and histological method. Moreover, no significant difference was found in retinal lslet-1 level in postnatal 7d between hyperoxic group and control group, but was significantly higher in postnatal 12, 14 and 17d mice compared with control mice. However, mice at postnatal 26d, expression of lslet-1 in retina decreased to normal level.
CONCLUSlON: ln processing mouse model of retinal neovascularization, sustained hypoxia retinal tissue induce retinal neovascularization by increas the expression of transcription factor lslet-1.

Objective To analyze the etiologic factors and clinical manifestation of intraventricular hemorrhage (IVH) in preterm infants.Methods One hundred and seventy-two preterm infants from June 2005 to August 2006 were accrued to investigate their gestational age,birth weight,birth history,and clinical symptoms.Cranial chromatic ultrasound was used to scan the preterm infants and diagnose IVH.Results 1.The incidence of IVH was associated with gestational age (?2=6.40 P=0.011);2.The incidence of IVH was also associated with birth weight(?2=26.49 P=0);3.IVH usually occurred within 72 h with mild clinical manifestations and was diagnosed within 5 days after birth;4.IVH occurred more frequently and more severe in infants with severe asphyxia than those with mild asphyxia.Conclusions Early gestational age,low birth weight, and severe asphyxia are risk factors for IVH.The clinical symptoms of IVH are usually mild in most patients.Cranial chromatic ultrasound is a reliable,sensitive and convenient method of detection for IVH in preterm infants.

Survivin a novel member of the inhibitor of apoptosis protein family, is overexpressed in most types of cancer but not in normal differentiated adult tissues. Its mRNA expression levels among hematogical malignancies are characteristic in each type, subtype and distinctive in different phases of disease, making it a reliable diagnostic marker for clinical stages. Recently, researches indicate that high levels of survivin expression are associated with a poor prognosis and may be involved in tumor resistance to multiple chemotherapeutic drugs. In addition, experiments demonstrate that leukemic vaccination with DC pulsed with survivin antigen in vitro inhibit the proliferation of leukemic cells. Furthermore, when transferred survivin antisense oligodeoxynucleotide or dominant-negative mutant survivin into, malignant cells can be induced apoptosis mediated by downregulation in survivin expression. These findings suggest that survivin may serve as a potential target for biological strategies against hematological neoplasms. This review focuses on expression of survivin in hematological malignancies, effects of survivin on drug-resistance and prognosis of hematological malignancies, and application of survivin in the treatment of hematological malignancies.
Apoptosis ; genetics ; Biomarkers, Tumor ; genetics ; Gene Expression Regulation, Neoplastic ; Hematologic Neoplasms ; genetics ; pathology ; Humans ; Inhibitor of Apoptosis Proteins ; Leukemia ; genetics ; pathology ; Lymphoma ; genetics ; pathology ; Microtubule-Associated Proteins ; genetics ; Myelodysplastic Syndromes ; genetics ; pathology ; Neoplasm Proteins ; genetics

OBJECTIVETo control the quality of the product, quantitative fingerprint was used to evaluate the composition of the amino acids in the Xingnao Tongluo injection.

METHODThe method of the quantitative fingerprint to the amino acids composition was established through AccQ Tag precolumn derivatization. The quality was evaluated by the quantitative test of the amino acids and the similarity in ten batches.

RESULTThe Xingnao Tongluo injection contained 12 amino acids and the contents of these amino acids were stable. All the ten batches of the samples had similarity of more than 0.90.

CONCLUSIONThe method was accurate, feasible and could be a simple and effective way to evaluate the quality of the traditional Chinese medicine.

Amino Acids ; chemistry ; Chromatography, High Pressure Liquid ; methods ; Drugs, Chinese Herbal ; chemistry ; Quality Control

Objective To observe the safety and efficacy of oncolytic adenovirus (H101) implantation under EUS guidance combined with gemcitabine in patients of non-operative pancreatic cancer.Methods From May 2007 to December 2007,6 patients with non-operative pancreatic cancer were enrolled in the study.H101 were implanted into 3 sites of the tumor under EUS guidance.Gemcitabine Was siren systemicly on d2,d9 and d16 after implantation, and repeated 1 month later.Tumor size and perfusion were assessed by computed reconstruction and perfusion imaging.Changes of clinical indices,adverse effects and complications were also recorded.Results All patients completed the two periods of treatment as planned.Tumor size decreased in 5 cases(18.21%-38.65%),but without statistical difference (P=0.078).The area of liver metastasis Was found decreased in 1 ease.Perfusion imaging showed significant increase of mean transit time(P=0.049) and improvement in blood flow,blood volume and permeability surface at 2 weeks after the treatment. KPS increased in 2 patients and pain score decreased in 3 patients.Three patients died 2.5,2.5 and 3 months respectively after the procedure.while 3 other patients are still alive with the survival time of 3,5 and 10 months. Major adverse effects associated with H101 implantation were fever and flu-like symptoms.Mild acute pancreatitis occurred in 1 cage.Conclusion EUS guided oncolytic adenovirus implantation in advanced pancreatic cancer is feasible and safe.With the combination of gemcitabine,it is capable of shrinking the tumor size,destroying the angiogenesis of the tumor and improving the patients'living quality.

OBJECTIVETo observe the protective effect and mechanism of intermittent hypobaric hypoxia (IHH) on cardiomyocytes induced by hydrogen dioxide.

METHODSMale guinea pigs were divided randomly into two groups (n = 10): intermittent hypoxia group (IHH), and control group (non-IHH). The IHH guinea pigs were exposed to a simulated 5,000 m high altitude and hypoxia in hypobaric chamber for 28 d, 6 h/d. The control guinea pigs were kept in the same environment as IHH except hypoxia exposure. Cardiomyocytes were enzymatically isolated from left ventricle of non-CIHH or CIHH guinea pigs. The contractile was assessed in guinea pigs by a video-based motion edge-detection system. The contents and activities of malondialdehyde(MDA), lactate hydrogenase(LDH) and antioxidant enzymes were evaluated by using biochemical methods.

RESULTS1. Hydrogen peroxide could induce contractile and diastole dysfunction, the latent period was longer in IHH cardiac myocytes. 2. After hydrogen peroxide(300 micromol/L, 10 min) perfusion, LDH and MDA contents in supernatant increased significantly in non-IHH and CIHH cardiomyocytes (P < 0.01), Whereas the contents of MDA and LDH in IHH cardiomyocytes were lower than those in non-IHH cardiomyocytes (P < 0.01). 3. The activities of superoxide dismutase (SOD) and catalase (CAT) were significantly increased in the myocardium of IHH guinea pigs, after hydrogen peroxide (300 micromol/L, 10 min) perfusion, SOD and CAT activities decreased significantly in non-IHH and CIHH cardiomyocytes (P < 0.01), whereas the activities of SOD and CAT in CIHH cardiomyocytes were still higher than those in non-IHH cardiomyocytes.

CONCLUSIONIHH had a protective effect on cardiomyocytes injury induced by hydrogen peroxide, which might relate with its antioxidation effects.

Altitude ; Animals ; Catalase ; metabolism ; Cells, Cultured ; Guinea Pigs ; Hydrogen Peroxide ; pharmacology ; Hypoxia ; metabolism ; L-Lactate Dehydrogenase ; metabolism ; Male ; Malondialdehyde ; metabolism ; Myocytes, Cardiac ; drug effects ; metabolism ; Superoxide Dismutase ; metabolism

OBJECTIVETo investigate the efficacy of hemoperfusion treatment in children with acute tetramine poisoning.

METHODSThirty-two children aged from 1 to 8 years ( mean 4.6+/-2.4 years) with acute tetramine poisoning received hemoperfusion treatment. Serum tetramine concentrations were measured by gas chromatography before hemoperfusion, 1 and 2 hrs after hemoperfusion initiation and 12 and 24 hrs by the end of hemoperfusion. The median time for full recovery of consciousness and the time to seizure control were observed.

RESULTSSeventeen children received hemoperfusion treatment for one time, 12 for twice, 2 for 4 times and 1 for 3 times. Twenty- seven (84%) cases recovered, 2 (7%) cases improved and 3 (9%) cases died of multi-organ failure. The serum tetramine concentrations 1 and 2 hrs after hrmoperfusion initiation were significantly lower than those before hemoperfusion (P<0.01). The serum tetramine concentrations 12 and 24 hrs by the end of hemoperfusion were also significantly lower than those before hemoperfusion (P<0.01). The median time for full recovery of consciousness and the time to seizure control were 5.4+/-4.2 and 10.1+/-7.3 hrs, respectively.

CONCLUSIONSHemoperfusion treatment is effective for acute tetramine poisoning in children.

Acute Disease ; Bridged-Ring Compounds ; blood ; poisoning ; Child ; Child, Preschool ; Female ; Hemoperfusion ; Humans ; Infant ; Male ; Time Factors