Dental Porcelain ; Dental Prosthesis ; methods ; Tooth Preparation

The aim of the study was to observe osseointegration of dental implants in osteoporotic rats. Rats were randomly divided into groups A(SHAM) and B(OVX), and pure titanium screws were implanted in the distal half of the right femurs. 1 5 and 3 months after implantation, half of the rats in each group were sacrificed and right femurs were observed by X ray photography, scan electron microscopy as well as light microscopy. The results showed that 1.5 and 3 months after implantation, the osseointegration index (OI) of group A was higher than that of group B. But the OI of each group was almost the same at different intervals. 1 5 months after implantation, the amount of new bone formation in group A was more abundant than that in group B, and it increased in group A but decreased in group B 3 months after implantation.The results confirmed that with higher BMD osseointegration was better. Osteoporotic changes could decrease OI and the amount of new bone formation at implant bone interface in rats. Osseointegration would not improve without outside factors.

Objective: To compare the differences between Lonicera Japonica Flos and Lonicera Flos by establishing HPLC fingerprint and calculating the similarity. Methods: The columns was Phenomenex Luna 5 μm C18 (2) 100 A, 250 mm×4.6 mm; The column temperature was 40℃. The mobile phase was acetonitrile-0.5% phosphoric acid, the flow rate was 1 mL/min, and the wavelength was 350 nm. Results: HPLC fingerprint of Lonicera Japonica and similarity evaluation by screening large peak integration were established. The similarity of 12 batches of Lonicera Japonica Flos were all above 0.95, and four batches of Lonicera Flos were less than 0.80. Conclusion: HPLC fingerprint profiles under 350 nm can reflex the differences between Lonicera Japonica Flos and Lonicera Flos effectively; Similarity evaluation by screening large peak integration shows the tiny differences of chemical component.

Objective To study the possible role of bone morphogenetic protein 7(BMP 7) in the TGF ?1 induced tubular epithelial myofibroblast transdifferentiation (TEMT) of cultured renal tubular epithelial cells. Methods The normal rat kidney tubular epithelial cell line (HK 2) was cultured for three days on plastic plates in the presence or absence of recombinant TGF ?1 and BMP 7. The alterations in the phenotype were assessed by phase contrast microscopy. Transdifferentiation of tubular cells into myofibroblasts was assessed by immunofluorescence, with monoantibodies to alpha smooth muscle actin (? SMA), vimentin and cytokeratin respectively. The expression of ? SMA of HK 2 cells was measured by flowcytometry. The expression of ? SMA mRNA of HK 2 cells was assessed with reverse transcriptase polymerase chain reaction (RT PCR). Results Treatment of HK 2 cells with BMP 7(50 and 100 ng/ml) for 24～48 hours increased cellular proliferation. The culture of HK 2 cells in the presence of TGF ?1 induced a clear fibroblast like morphology, a loss of the epithelial marker cytokeratin and de novo expression of ? SMA and vimentin. Immunofluorescence staining showed the addition of various concentrations of BMP 7 to subconfluent cells for 24 and 48 hours, and the expression of ? SMA and vimentin was decreased. There was an increase in the percentage of cells expressing ? SMA with TGF ?1, which was completed inhibited by an addition of BMP 7(P

Small interfering RNA (siRNA) is the initiator of RNA interference and inhibits gene expression by targeted degradation of specific messenger RNA. siRNA-mediated gene regulation has high efficiency and specificity and exhibits great significance in the treatment of diseases. However, the naked or unmodified siRNA has poor stability, easy to degrade by nuclease, short half-life, and low intracellular delivery. As an emerging non-viral nucleic acid delivery system, ionizable lipid nanoparticles play an important role in improving the druggability of siRNA. At present, one siRNA drug based on ionizable lipid nanoparticles has been approved for the treatment of rare disease. This review introduces the research progress in ionizable lipid nanoparticles for siRNA delivery, focusing on the effect of each component of lipid nanoparticles on the efficiency of siRNA-mediated gene silencing, which provides new references for the studies on ionizable lipid nanocarriers for siRNA delivery.

OBJECTIVE: To explore the feasibility of detecting of Y-STR of fetal DNA in maternal plasma using Ion Torrent PGM™ System. METHODS: A total of 16 fetal DNA samples from maternal plasmas (8 cases from 38 weeks gestational age and 8 ones from 12 weeks) were prepared and a multiplex assay with 7 STR loci (DYS390, DYS391, DYS393, DYS438, DYS437, DYS456, DYS635) was designed for multiplex-PCR amplification. Using Ion Torrent PGM™ System, the results of Y-STR sequences and capillary electrophoresis were obtained and compared. RESULTS: Y-STR specific alleles were detected in the maternal plasma of all the pregnant women having male babies of second and third trimester, which were higher than that detected by capillary electrophoresis. Consistent Y-STR genotypes were observed between fetal DNA from maternal plasma and genomic DNA from the newborn babies. CONCLUSION Based on Ion Torrent PGM™ System, the prenatal Y-STR detection method may provide a high-sensitive and high-throughput choice for prenatal STR detection in forensic testing.
Alleles ; Chromosomes, Human, Y/genetics* ; DNA/blood* ; Family ; Female ; Fetal Blood/chemistry* ; Genotype ; Haplotypes ; Humans ; Male ; Polymerase Chain Reaction ; Polymorphism, Genetic ; Pregnancy ; Sensitivity and Specificity ; Sex Determination Analysis ; Tandem Repeat Sequences/genetics*

Female ; Humans ; Liver Neoplasms ; Middle Aged ; Paraganglioma

To study the chemical constituents from the bark of Myrica rubra, fourteen compounds were isolated from the methanolic extract using various chromatographic techniques, including silica gel, Sephadex LH-20 and preparative HPLC. Their structures were identified on the basis of chemical properties and spectroscopic data, as 3, 5-dimethoxy-4-hydroxymyricanol (1), myricanol (2), myricanone (3), myricanol 11-sulfate (4), myricitrin (5), quercetin (6), quercetin-3-rhamnoside (7), tamarixol (8), uvaol (9), ursolic acid (10), taraxerol (11), myricadiol (12), β-sitosterol (13) and β-daucosterol (14). Among them, compound 1 is a new compound, named as 3, 5-dimethoxy-4-hydroxymyricanol, compounds 8, 9 were isolated from the genus Myrica for the first time.
Diarylheptanoids ; chemistry ; isolation & purification ; Myrica ; chemistry ; Phytochemicals ; chemistry ; isolation & purification ; Plant Bark ; chemistry

The paper is aimed to establish a method of residue analysis for thiamethoxam and to study its degradation dynamic and final residue and its standard of safe application of thiamethoxam on Lonicera japonica. Samples extracted with methanol by ultrasonication were purified with dichloromethane by liquid-liquid extraction and SPE column and analysed by HPLC-UV. The results showed that average rate was 84.91%-94.44% and RSD 1.74%-4.96% with addition of thiamethoxam in respectively diverse concentration, which meets inspection requirement of pesticide residue. Two kinds of dosages of thiamethoxam were treated- varying from recommended dosage (90 g x hm(-2)) to high dosage (135 g x hm(-2)), Results of two years test showed that thiamethoxam was degraded more than 90% seven days after application and the half - life period of thiamethoxam was 1.54-1.66 d. The digestion rate of thiamethoxam was fast in the L. japonica. The recommended MRL of thiamethoxam in the L. japonica is 0.1 mg x kg(-1), the dosage of 25% thiamethoxam WDG from 90-135 g x hm(-2) is sprayed less than three times a year on L. japonica and 14 days is proposed for the safety interval of the last pesticide application's and harvest's date.
Agriculture ; methods ; standards ; Chromatography, High Pressure Liquid ; Flowers ; chemistry ; growth & development ; parasitology ; Half-Life ; Insect Control ; methods ; standards ; Insecticides ; adverse effects ; chemistry ; Lonicera ; chemistry ; growth & development ; parasitology ; Neonicotinoids ; Nitro Compounds ; adverse effects ; chemistry ; Oxazines ; adverse effects ; chemistry ; Pesticide Residues ; adverse effects ; chemistry ; Plant Diseases ; parasitology ; prevention & control ; Thiazoles ; adverse effects ; chemistry

The aim of this study is to prepare hyaluronic acid (HA) modified core-shell liponanoparticles (pHA-LCS-NPs) as gene delivery system and investigate its gene transfection efficiency in human retinal pigment epithelium (ARPE-19) cells in vitro. The pHA-LCS-NPs was prepared by firstly hydrating dry lipid film with CS-NPs suspension to get LCS-NPs, then modifying the lipid bilayer with HA by amidation reaction between HA and dioleoyl phosphatidylethanolamine (DOPE). Its morphology, particle size and zeta potential were investigated. XTT assay was used to evaluate the cell safety of different vectors in vitro. The gene transfection efficiency of pHA-LCS-NPs modified with different contents of HA was investigated in ARPE-19 cells with green fluorescent protein (pEGFP) as the reporter gene. The results showed that the obtained pHA-LCS-NPs exhibited a clear core-shell structure with the average particles size of (214.9 +/- 7.2) nm and zeta potential of (-35 +/- 3.7) mV. The 24 h cumulative release of gene from pHA-LCS-NPs was less than 30%. After 48 h incubation, gene transfection efficiency of pHA-LCS-NPs/pEGFP was 1.81 times and 3.75 times higher than that of CS-NPs/pEGFP and naked pEGFP, respectively. Also no obvious cytotoxicity was observed on pHA-LCS-NPs. It suggested that the pHA-LCS-NPs might be promising non-viral gene delivery systems with high efficiency and low cytotoxicity.
Cell Survival ; Gene Transfer Techniques ; Genes, Reporter ; Genetic Vectors ; Green Fluorescent Proteins ; metabolism ; Humans ; Hyaluronic Acid ; chemistry ; pharmacology ; Lipids ; Nanoparticles ; Particle Size ; Phosphatidylethanolamines ; chemistry ; pharmacology ; Retinal Pigment Epithelium ; drug effects ; Transfection