DY-1 suspending rescue seat on helicopter is a helicopter-equipped apparatus which is used to rescue flight personnel forced to parachute or landing,or other individual disasters. The thesis briefly introduces the seal s working principle,performances and some experimenting results. It errphasizes on recounting the structure and the condition at operation of the active arm's locking mechanism of the rescue seat's peron fixed ring.

Objective:To prepare and purify siRNA targeting a proliferation-inducing ligand targeted(APRIL-siRNA),so as to provxde a basis for studying the role of APRIL in human pancreatic cancer.Methods:pET-22b-APRIL was constructed to express APRIL dsRNA of human pancreatic cancer cell line CFPAC-1 in E.coli and the product was purified by chromatography using CF-11 column.APRIL dsRNA was digested by RNaseⅢto prepare APRIL siRNA,then the reaction mixture was loaded onto a DEAE ion exchange chromatography to remove RNaseⅢfrom oligonucleotides,and size exclusion chromatography was used to purify 21 bp siRNA.The purified APRIL siRNA was used to transfect Chinese hamster ovary(CHO)cells and the expression of APRIL in CHO cells was observed under fluorescence microscope Results:APRIL dsRNA was successfully expressed in E.coli after IPTG induction and was purified by CF-11 column.dsRNA was hydrolyzed with RNaseⅢand was purified by DEAE ion exchange chromatography and size exclusion chromatography.15% nondenaturing PAGE and 12% SDS- PAGE confirmed that RNaseⅢwas removed from oligonucleotides and 21 bp siRNA was purified with size exclusion chromatography.It was also found that APRIL siRNA obviously depressed APRIL expression in CHO cells.Conclusion:We have successfully constructed APRIL siRNA targeting APRIL gene of CFPAC-1 cells with in vitro transcription,which provides a basis for knock-down of APRIL gene in CFPAC-1 cells.

OBJECTIVE: To investigate the frequency of transfusion transmitted virus (TTV) infection in healthy blood donors in Hangzhou area and the mutation of TTV genomic fragment. METHODS DNA in serum samples of 203 healthy donors was extracted by phenol-chloroform method to detect TTV by semi-nested polymerase chain reaction and nucleotide sequences of partial amplification products were determined after T-A cloning. RESULTS TTV infection rate in 203 cases of blood donors in Hangzhou area was 15.3%. The homology of the amplified products of partial TTV positive samples compared with thereported nucleotide and putative amino acid sequences of TTV TA278 were 63.51% approximate, equals 67.12% and 59.46% approximate, equals 66.22% respectively. CONCLUSIONS TTV infection rate in the blood donors in Hangzhou is relatively high. The TTV infecting blood donors in the area may be a kind of novel genotype.

OBJECTIVETo study the pharmacologic characteristics in synergism and complementation of 999 Ganmaoling (GML), a compound recipe composed of Chinese and Western materia medica (CMM & WMM), as well as its theoretical basis of matching of Chinese and Western materia medica.

METHODSThe torsion response induced by glacial acetic acid in mice, toe swelling induced by carrageenanin rats, delayed hypersensitive response in mice and fever induced by endotoxin in rats and rabbits were used to comparatively study the actions of CMM & WMM in GML. The effect of CMM in antagonizing liver damage caused by WD (acetaminophen) in mice was also studied. RT-PCR method was used to analyze the expression of related cytokines.

RESULTSGML showed a significant antipyretic and analgesic effect, it could inhibit the carrageenan induced inflammation, antagonize the endotoxin induced fever, and promote the amount for expression of cytokines in rats' splenic tissue with pneumococci infection to some extent. The CMM in GML showed certain protective effect on acetaminophen induced liver damage.

CONCLUSIONGML has a potent antipyretic, analgesic and anti-inflammatory effects, CMM & WMM in GML showed markedly synergism and complementation, and CMM in it has liver protective effect.

Acetaminophen ; pharmacology ; Animals ; Anti-Inflammatory Agents, Non-Steroidal ; pharmacology ; Caffeine ; pharmacology ; Chlorpheniramine ; pharmacology ; Common Cold ; drug therapy ; Drug Combinations ; Drug Synergism ; Drugs, Chinese Herbal ; pharmacology ; Female ; Male ; Mice ; Mice, Inbred BALB C ; Mice, Inbred ICR ; Rabbits ; Rats ; Rats, Sprague-Dawley

Objective To analyze the relationship between influenza epidemic and genetic characteristic on the whole genome of influenza virus subtype A/H3N2 strains isolated in Zhejiang province during 1998 to 2009. Methods All of the eight genes from the 19 Zhejiang influenza virus isolates, circulated during 1998 to 2009, were amplified by RT-PCR and sequenced. The obtained sequences were aligned and analyzed with the vaccine strains being used in the last 10 years.Results The highest mutation happened within HA and NA genes and the amino acid divergent ratios were 13.98% and 10.00%. Amongst the six internal proteins, the amino acid divergent ratios of NP, M2 and NS1 were 6.43%, 6.19% and 3.48% respectively, and the others were lower than 3%.Other than the HA and NA genes, mutations were also observed on six internal genes of the strains isolated in those years when the influenza virus subtype A/H3N2 was widely circulating.Additionally, there had been an obvious genetic lag between vaccine strains recommended by WHO and the contemporary Zhejiang epidemic strains for many years. Conclusion Besides on HA and NA genes, surveillance programs should also be covered mutations regarding the internal genes of influenza virus subtype A/H3N2 strains, in order to provide important information for forecasting and warning of a new round of influenza epidemic.

BACKGROUND AND OBJECTIVEThe level-Ib lymph node metastasis is rare in nasopharyngeal carcinoma (NPC). When and how this level should be irradiated with precise radiotherapy remains controversial. This study evaluated the prevalence and prognostic significance of level-Ib lymphadenopathy on the prognosis of NPC patients.

METHODSFrom January 1990 and December 1999, 933 newly diagnosed patients with NPC treated at Sun Yat-sen University Cancer Center were randomly selected, examined with computed tomography (CT) imagining for evidence of level-Ib lymphadenopathy before treatment. All patients received radical radiotherapy with or without chemotherapy. The relationship between level-Ib lymphadenopathy and post-treatment outcomes including overall survival (OS), locoregional recurrence-free survival (LRFS), and distant metastasis-free survival (DMFS) were analyzed using Kaplan-Meier methods. The Cox proportional hazards regression model was used to adjust for other prognostic factors.

RESULTSOf the 933 patients, 55 (5.9%) were found to have level-Ib lymphadenopathy, which was associated with carotid sheath involvement, oropharynx involvement and levels, and lateral cervical lymph node involvement. In the subgroup with carotid sheath involvement, with multivariate analysis accounting for all previously known prognostic factors, level-Ib lymphadenopathy was still associated with a risk of decreased OS (RR, 2.124; P<0.001), DMFS (RR, 2.168; P<0.001), and LRFS (RR, 1.989; P=0.001).

CONCLUSIONLevel-Ib lymphadenopathy in the patients with carotid sheath involvement is an independent prognostic factor.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Carcinoma, Squamous Cell ; diagnostic imaging ; drug therapy ; pathology ; radiotherapy ; Chemotherapy, Adjuvant ; Child ; Cobalt Radioisotopes ; therapeutic use ; Female ; Humans ; Lymph Nodes ; pathology ; Lymphatic Metastasis ; Male ; Middle Aged ; Nasopharyngeal Neoplasms ; diagnostic imaging ; drug therapy ; pathology ; radiotherapy ; Neck ; pathology ; Neoplasm Metastasis ; Neoplasm Recurrence, Local ; Particle Accelerators ; Pharynx ; pathology ; Prognosis ; Proportional Hazards Models ; Radiography ; Radioisotope Teletherapy ; Retrospective Studies ; Survival Rate ; Young Adult

OBJECTIVETo explore changes of Clara cell protein (CC16) and surfactant protein-D (SP-D) in the serum of patients with silicosis.

METHODThe concentrations of CC16 and SP-D were measured in the serum by sandwich enzyme-linked immunosorbent assays. The subjects consisted of 30 healthy volunteers and 90 silica-exposed workers including silica-exposed group, the silicosis of suspects group (0(+)) and the silicosis phase I group, 30 subjects each groups.

RESULTSThe concentrations of CC16 in the serum was significantly decreased in silica-exposed workers compared to controls (P < 0.01); The concentrations of CC16 in the serum were higher in lifelong nonsmokers than the current smokers in control subjects (P < 0.05), but they were no differences between lifelong nonsmokers and current smokers of 90 silica-exposed workers. Compared with control subjects, the levels of SP-D in the serum of silicosis suspects (0(+)) and silicosis phase I groups were significantly elevated (P < 0.01, respectively), which were also higher than silica-exposed group (P < 0.05 and P < 0.01, respectively), Discriminant equations set by CC16 and SP-D were used in diagnosis of silicosis, and the rate of accuracy in healthy volunteers, the silica-exposed group and the silicosis phase I group were 86.7%, 86.7% and 76.7%, respectively, The total rate of correct classification hit 84.2%.

CONCLUSIONThe serum CC16 of long-term silica-exposed workers is decreased, and SP-D is increased gradually.

Adult ; Case-Control Studies ; Epithelial Cells ; metabolism ; Humans ; Male ; Middle Aged ; Pulmonary Surfactant-Associated Protein D ; blood ; Silicosis ; blood ; Uteroglobin ; blood

OBJECTIVETo construct lipL32/1-lipL41/1 fusion gene and its prokaryotic expression system and to determine frequencies of carrying and expression of lipL32 and lipL41 genes in L.interrogans wild strains and specific antibody levels in sera from leptospirosis patients.

METHODSlipL32/1-lipL41/1 fusion gene was constructed using linking primer PCR method and the prokaryotic expression system of the fusion gene done with routine techniques. SDS-PAGE was used to examine expression of the target recombinant protein rLipL32/1-rLipL41/1. Immunogenicity of rLipL32/1-rLipL41/1 was identified by Western blot. PCR and MAT were performed to detect carrying and expression of lipL32 and lipL41 genes in 97 wild L.interrogans strains. Antibodies against products of lipL32 and lipL41 genes in serum samples from 228 leptospirosis patients were detected by ELISA method.

RESULTSThe homogeneity of nucleotide and putative amino acid sequence of lipL32/1-lipL41/1 fusion gene were 99.9 % and 99.8 % in comparison with the reported sequences. Expression output of the target recombinant protein rLipL32/1-rLipL41/1, mainly present in inclusion body, accounted for 10 % of the total bacterial proteins. Both the rabbit antisera against rLipL32/1 and rLipL41/1 could combine to rLipL32/1-rLipL41/1. 97.9 % and 87.6 % of the L.interrogans wild strains had lipL32 and lipL41 genes, respectively. 95.9 % and 84.5 % of the wild strains were positive for MAT with titers of 1:4 - 1:128 using rabbit anti-rLipL32s or anti-rLipL41s sera, respectively. 94.7 % - 97.4 % of the patients'serum samples were positive for rLipL32s antibodies, while 78.5 % - 84.6 % of them were rLipL41s antibodies detectable.

CONCLUSIONlipL32/1-jlipL41/1 fusion gene and its prokaryotic expression system were successfully constructed. The expressed fusion protein had qualified immunogenicity. Both the lipL32 and lipL41 genes are extensively carried and frequently expressed by different serogroups of L.interrogans, and their expression products exhibit cross-antigenicity.

Antibodies, Bacterial ; blood ; Antigens, Bacterial ; genetics ; immunology ; Bacterial Outer Membrane Proteins ; genetics ; Cloning, Molecular ; Enzyme-Linked Immunosorbent Assay ; Gene Expression Regulation, Bacterial ; Genes, Bacterial ; genetics ; Humans ; Leptospira interrogans ; genetics ; Leptospirosis ; immunology ; microbiology ; Lipoproteins ; genetics ; Prokaryotic Cells ; metabolism ; Recombinant Fusion Proteins ; biosynthesis ; genetics ; immunology

OBJECTIVETo construct prokaryotic expression systems of ltB/ctB-ompL1/1 fusion genes and to determine the L.interrogans carrying status in leptospirosis patients with the expression products.

METHODSThe fusion genes ltB-ompL1/1 and ctB-ompL1/1 were constructed using linking primer PCR method. SDS-PAGE was used to examine expression of the target recombinant proteins rLTB-rOmpL1/1 and rCTB-rOmpL1/1. Western blot and GM1-ELISA were used to measure the immunogenic and GM(1)-binding activities of rLTB-rOmpL1/1 and rCTB-rOmpL1/1, respectively. PCR and MAT were performed to detect the expression of ompL1 gene in 97 wild L.interrogans strains. Antibodies against ompL1 gene products in serum samples of 228 leptospirosis patients were detected with ELISA method.

RESULTSThe homogeneity of nucleotide and putative amino acid sequence of ltB-jompL1/1 and ctB-ompL1/1 fusion genes were 99.7 % - 99.9 % and 99.5 % - 100 %, in comparison with the reported corresponding sequences. Expression outputs of both rLTB-rOmpL1/1 and rCTB-rOmpL1/1, mainly present in inclusion body, accounted for 10% of the total bacterial protein. Both rLTB-rOmpL1/1 and rCTB-rOmpL1/1 could combine to rabbit anti-rOmpL1/1 serum and bovine GM(1). 89.7 % of L.interrogans wild strains had ompL1 gene. 87.6% of the wild L.interrogans strains presented positive results for MAT (titers :1:4-1:256) with the rabbit anti-rOmpL1/1 or anti-rOmpL1/2 sera. 86.8% and 88.6% of the patients' serum samples were positive for rOmpL1/1 and rOmpL1/2 antibodies, respectively.

CONCLUSIONThe fusion proteins, rLTB-rOmpL1/1 and rCTB-rOmpL1/1, showed high immunogenic and GM(1)-binding activities. ompL1 gene is extensively distributed and frequently expressed in different serogroups of L.interrogans and its products expressed by different genotypes exhibit extensive cross-antigenicity.

Bacterial Outer Membrane Proteins ; genetics ; immunology ; Bacterial Toxins ; genetics ; Bacterial Vaccines ; genetics ; Cloning, Molecular ; Enterotoxins ; genetics ; Escherichia coli Proteins ; genetics ; Genes, Bacterial ; genetics ; Humans ; Leptospira interrogans ; genetics ; immunology ; Prokaryotic Cells ; metabolism ; Recombinant Fusion Proteins ; genetics ; immunology ; Vaccines, Synthetic ; genetics

OBJECTIVETo determine the effects of leptospiral strains with different virulence on intracellular free Ca(2+)level and its relation with phospholipase C (PLC) activity of L.interrogans.

METHODSL.interrogans-j infection cell modals were established with Vero and J774A.1 cell lines. Vero and J774A.1 cells were co-incubated with L.interrogans serogroup Icterohaemorrhagiae serovar lai strain 56601 (strong virulence) and serogroup Pomona serovar pomona strain 56608 (weak virulence) and L.biflexa serogroup Samaranga serovar patoc strain Patoc I (non-virulence). Intracellular free Ca(2+)levels were detected by laser scanning confocal microscopy with specific fluorescence labeling of fluoj3/AM. Using [(3)H] PIP2 as the substrate, the PLC activities in the culture supernatant, and cytoplasma and cytomembrane of the three strains of Leptospira were measured by isotope assay.

RESULTSThe baseline intracellular free Ca(2+)levels in the normal Vero and J774A.1 cells were (102.3+/-8.2)% and (105.9+/-7.3)%,respectively. The fluorescence intensity in the two cell lines incubated with L.biflexa strain Patoc I were fluctuated in range of (102.3+/-8.2)%approximate, equals(102.2+/-8.3)% during the observation period. The intracellular free Ca(2+)levels in the two cell lines infected with L.interrogans strain 56601 showed elevation with double peak patterns, with first peaks of (430.5+/-35.7)%, (747.5+/-18.5)% and the second peak of (380.6+/-17.4)%, (804.6+/-22.4)%, respectively. When the cells were infected with L.interrogans strain 56608, the intracellular free Ca(2+)levels were rising slowly with a single slope-like pattern, with the maximal of (235.0+/-19.3)% in Vero cells and (402.4+/-17.4)% in J774A.1 cells, which were significantly lower than those in the cells infected with L.interrogans strain 56601 (P<0.01). The culture supernatants, and cytoplasma and cytomembrane proteins of all three strains displayed PLC activities (P<0.05).

CONCLUSIONThe cells infected with L.interrogans of different virulence show distinct intracellular free Ca(2+)levels and peak patterns. The different host cell lines can affect the intracellular free Ca(2+)levels, which is not related to the PLC activity in the leptospiral strains.

Animals ; Calcium ; metabolism ; Cells, Cultured ; Cercopithecus aethiops ; Endocytosis ; Humans ; Leptospira interrogans ; enzymology ; pathogenicity ; Macrophages ; metabolism ; microbiology ; Type C Phospholipases ; metabolism ; Vero Cells ; Virulence