Objective To analyze sampling frequency and grid density frequency on the computed radiography(CR)system and to develop an effective method to suppress or eliminate grid artifacts.Methods To test grids with different grid-density in combination with IP boards of different specifications. Radiographic images with various qualities were obtained by simulating two kinds of signaling frequencies (namely two kind of grids with different grid densities),and utilizing three kinds of sampling frequencies (6,8,10 pixels/mm).A variety of different simulation images were obtained.Results By comparing simulation images with actual images,it was discovered that correct signaling frequency could be achieved if the sampling frequency were equal to twice the signaling frequency.The obtained image was clear and free of grid artifact.A grid density of

Objective To obtain recombinant vaccinia viruses of gag gene,and hIL 2 gene of HIV 1CN subtype B,evaluate the immune effects after immunization together with nucleic acid vaccine for AIDS vaccine development.Methods gag gene,and hIL 2 gene were inserted downstream of the combined promotor of pJ38 vector.Recombinant vaccinia viruses were selected by using plaque assay.Expression products were examined by SDS PAGE and Western blot.Immune response of BALB/c mice immunized was evaluated by lymphocyte transformation test and OD value of serum IgG antibody.Results Recombinant vaccinia viruses vJ38gag IL 2 were obtained with reactinogenicity.Effect of recombinant vaccinia viruses immunized three times was better than that immunized two times.The best result was obtained in the rVV primed and nucleic acid vaccine boosted group.Conclusion Gag protein and IL 2 protein can be expressed in vJ38gag IL 2

Adult ; Benzene ; toxicity ; Bone Marrow ; drug effects ; pathology ; Bone Marrow Cells ; Humans ; Leukemia, Monocytic, Acute ; chemically induced ; pathology ; Male

To try to find out the possible use of histochemistry in the prenatal diagnosis in first trimester of pregnancy, 20 kinds of enzymes in chorionic villi from 6th to 9th week of gestation which are related to inborn errors of metabolism were investigated and graded according to their histochemical reactive intensity; the enzymes listed below: (1). ?-glucuronidase, (2). ?-galactosidase, (3). arylsulfatase, (4). ?-N-acetylglucosaminidase, (5). 3?-hydroxysteroid dehydrogenase, (6). NADH dehydrogenase, (7). adenosine triphosphatase, (8). alkaline phosphatase,(9). acid phosphatase, (10). creatine phosphokinase, (11). glutamic dehydrogenase, (12). aldolase, (13). xylitol dehydrogenase, (14). alcohol dehydrogenase, (15). xanthine oxidase, (16). catalase, (17). ornithine carbamoyl transferase, (18). lipase, (19). cholinesterase, (20). ?-glutamyl transpeptidase. The experimental results show that the last 6 kinds of enzymes present negative reactions. Since the his- tochemical reactions of the first 14 kinds of enzymes are positive, it is possible that they can be used for the prenatal diagnosis of inborn errors of metabolism caused by dificiency of corresponding enzymes. The results also show that compared with biochemical method, histochemical method has the advantages of requiring smaller amount of chorionic villi, being without contamination by maternal cells, simplicity and rapidity.

Objective: To determine puerarin content in Cuochanglin Granules by HPLC. Methods: The determination was performed on C 18 column with MeOH H 2O(25∶75) as a mobile phase by means of external standard method. Results: There was a linear relationship between puerarin and chromatographical peak area when puerarin concentration was at a range of 0.099?g～0.495?g. Conclusion: The method is simple, accurate and sensible, and can be used for quality control of this preparation.

The nonstructural protein 5A (NS5A) of the hepatitis C virus (HCV) has been shown to interact with a variety of cellular proteins and implicated in the regulation of cell growth, interferon resistance, and other cellular signaling pathways. Using the yeast-two hybrid method, we have isolated a clone that encodes a novel NS5A--associated binding protein: NS5ABP37. Reverse transcription polymerase chain reaction (RT-PCR) method was employed to amplify the full fragment,and the plasmid pGADT7-NS5ABP37 with the Saccharomyces cerevisiae vector pGADT7 was constructed. To prove the interaction, yeast cell Y187 transformed with pGADT7-NS5ABP37 was mated with yeast cell AH109 containing pGBKT7-NS5A to verify the interaction between the novel protein coded by the new gene NS5ABP37 and NS5A.

Protein-protein binding is the basis of virus and host cell interactions. With the application of technology of studying protein interactions, more knowledge of replication and pathogenesis of hepatitis C virus (HCV) was acquired. Non-structure protein 5B(NS5B) of HCV is a kind of viral protein, which plays an important role in replication of HCV. However, the effect of NS5B is not clear. To investigate the biological function of NS5B, we performed yeast two hybrid to look for proteins in hepatocytes interacting with NS5B. We constructed NS5B bait plasmid by cloning the gene of NS5B into pGBKT7, then transformed it into yeast AH109(a type). The transformed yeast was mated with yeast Y187(? type)containing liver cDNA library plasmid in 2?YPDA medium. Diploid yeast was plated on synthetic dropout nutrient medium (SD/-Trp-Leu-His-Ade) containing x-?-gal for screening. Thirty-three colonies were selected and sequenced. Among them, two colonies were new genes with unknown function. The preliminary successful cloning of gene of protein interacting with NS5B paved the way for the study of the physiological function of NS5B and its associated protein.

Objective HCV NS3 protein plays an important role in disease caused by HCV. We investigate the gene expression of HCV NS3 in yeast for future study of the function of the protein. Methods PCR was performed to amplify the gene of HCV NS3 from the plasmid pBRTM/HCV containing the whole fragment of HCV and the gene was cloned into pGEM T vector. Thereafter, HCV NS3 gene was cut from pGEM T vector and cloned into yeast expression plasmid pGBKT7, and recombinant pGBKT7∶NS3 was transformed into yeast AH109. The yeast protein was isolated and analyzed with sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS PAGE) and Western blotting. Results HCV NS3 gene was successfully cloned into pGBKT7. The results of SDS PAGE and Western blotting assay showed that the molecular weight of the expressed product was about 22000 Da and HCV NS3 protein was existed within yeast cells.Conclusions HCV NS3 was successfully expressed in yeast expression system.

Objective To evaluate the efficacy of video-assisted thoracoscopic surgery(VATS)for spontaneous pneumothorax.Methods From January 2003 to June 2006,VATS was carried out in 61 cases of spontaneous pneumothorax in our hospital.Resection or ligatation of pulmonary bullae,and pleurodesis were performed by using Endo-GIA.Results Among the cases,unilateral VATS was performed on 58 patients(an axillary small incision was made in one case),and bilateral VATS was done in 3.No conversion to open surgery or severe postoperative complications occurred in this series.Pulmonary bullae was detected in 56 of all the patients.The operation time was 35-55 min(mean,46 min)for unilateral VATS,and was 85,175,and 190 min respectively for the 3 cases of bilateral VATS.The mean blood loss for unilateral operation was 40 ml(range,30-45 ml),and the blood loss in the 3 cases of bilateral VATS was 55,60,and 200 ml.The thoracic-drainage volume was 230-500 ml(mean,390 ml)in the unilateral cases,and was 350,1030,and 1200 respectively in the 3 bilateral cases.The drainage tube was withdrawn 3-6 d(mean 4 d)later in the unilateral cases,and 3,4,and 5 d later in the 3 bilateral cases.The 61 patients were followed up for 4-24 mon(mean,8 mon),during which one patient experienced recurrent pneumothorax in 2 months and was cured by closed thoracic drainage.Conclusions VATS is safe and effective for patients with spontaneous pneumothorax.

Objective To investigate the related risk factors and neonatal outcomes in early preterm birth by analysis of 198 cases of early-to-moderate preterm birth. Methods Retrospective analysis was conducted on 198 pregnant women hospitalized during January 2004 to September 2006 with early-to-moderate preterm birth who delivered at 28 to 33+6 weeks of gestational age and their preterm infants.All of them were divided into two groups: early preterm birth group,28 to 3l+6 weeks of gestational age,n=90 for the pregnant women and n= 99 for the preterm infants;moderate preterm birth group,32 to 33+6 weeks of gestational age,n=108 for the pregnant women and n=122 for the preterm infants(fatal birth defects were excepted).The risk factors for preterm birth and neonatal outcomes were compared between the two groups. Results Various factors contributed to the occurrence of preterm birth.Systemic antenatal care and weight gain during pregnancy were significantly less found in the early preterm birth group than the moderate preterm birth group(P