Rui Huang

Sun Yat-Sen University, Shengcheng, Guangdong, China

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Publications (7)18.14 Total impact

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    ABSTRACT: To compare the power of the 4 intraocular pressure (IOP) measures, that is, peak, mean, range, and SD, over a 24-hour period in predicting IOP variations in order to determine which measure of IOP fluctuation correlates best with actual office-hour readings in glaucoma patients and healthy subjects. For this prospective study, 25 subjects with untreated primary open-angle glaucoma and 33 healthy individuals were hospitalized for 24 hours. Measurements of the subjects' IOP for both eyes were recorded with a Goldmann applanation tonometer every 3 hours in the sitting position during the daytime (9 AM to 9 PM) and with a TonoPen in both the sitting and supine positions for 24 hours. Only 1 eye was selected randomly per subject for the final analysis. The strength of association between the estimated values and the actual 24-hour IOP data in habitual body positions was analyzed using the coefficient of determination (R). The differences were calculated. The percentage of subjects with estimated IOP values falling within the cutoff values from the 24-hour data were assessed. The peak IOP was captured outside office hours in 57% of the young subjects, 75% in the elderly control group, and 52% of the glaucoma patients. The estimation of the strength of association for the mean IOP and peak IOP showed strong to moderate correlations (R range from 0.29 to 0.95) compared with the estimation of range and SD of IOP fluctuation, which demonstrated weak to moderate relationships (R range from 0.001 to 0.69). The percentage of significant cases mostly corresponded with the correlation. With the combination of sitting and supine position readings during office hours, the study provides promising results in estimating the mean and peak IOP in glaucoma patients and healthy subjects; however, it showed little advantage in range and SD of IOP fluctuation.
    Journal of glaucoma 04/2014; DOI:10.1097/IJG.0000000000000059 · 2.43 Impact Factor
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    ABSTRACT: Purpose: To evaluate the effect of ginkgo biloba extract on visual field defect and contrast sensitivity in a Chinese cohort with normal tension glaucoma. Methods: In this prospective, randomized, placebo-controlled crossover study, patients newly-diagnosed with normal tension glaucoma, either in a tertiary glaucoma clinic (n=5) or in a cohort undergoing routine general physical examinations in a primary care clinic (n=30), underwent two 4-week phases of treatment, separated by a washout period of 8 weeks. Randomization determined whether ginkgo biloba extract (120 mg per day, Dr. Willmar Schwabe GmbH & Co. KG, Germany) or placebo (identical-appearing tablets) was received first. Primary outcomes were change in contrast sensitivity and mean deviation on 24-2 SITA standard visual field testing, while secondary outcomes included intraocular pressure and self-reported adverse events. Results: Thirty-five patients (mean age 63.7±6.5 years) were randomized; those in the ginkgo biloba extract - placebo sequence group (n=18) did not differ at baseline from placebo - ginkgo biloba extract (n=17) in age, sex, visual field mean deviation, contrast sensitivity, intraocular pressure and blood pressure. Twenty-eight patients (80.0%, 14 in each group) completed testing. Changes in visual field and contrast sensitivity did not differ by treatment received or sequence (P>0.2 for all). Power to have detected a difference in mean defect as large as previously reported (Quaranta et al, 2003) was 80%. Conclusions: In contrast to some previous reports, ginkgo biloba extract treatment had no effect on mean defect or contrast sensitivity in this group of normal tension glaucoma patients.
    Investigative ophthalmology & visual science 11/2013; 55(4). DOI:10.1167/iovs.13-13168 · 3.66 Impact Factor
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    ABSTRACT: Background The result of primary open-angle glaucoma is the loss of retinal ganglion cells. Transient receptor potential cation channel 6 is a pressure-related channel that may function in the survival of retinal ganglion cells. The purpose of this study was to evaluate the expression levels of the transient receptor potential cation channel 6 gene in patients with primary open-angle glaucoma. DesignRandomization study at Zhongshan Ophthalmic Center in China. Participants80 primary open-angle glaucoma patients and 75 cataract patients recruited from Zhongshan Ophthalmic Center. Methods Total RNA was extracted from the leukocytes of the peripheral blood collected. The levels of transient receptor potential cation channel 6–messenger RNA were determined by real-time polymerase chain reaction. Related factors including age, intraocular pressure, optic cup-to-disc ratio and visual field defect were analysed accordingly. Main Outcome MeasuresClinical examination and the messenger RNA level. ResultsThe expression level of the transient receptor potential cation channel 6 gene in the leukocytes of primary open-angle glaucoma patients was two times higher when compared with control cataract patients. The gene expression level was also correlated with intraocular pressure and cup-to-disc ratio. Treatment with different anti-glaucoma drugs did not affect the gene expression. Conclusions Increasing expression levels of the transient receptor potential cation channel 6 gene in the blood accompanies chronic elevation of intraocular pressure in primary open-angle glaucoma and may serve as a genetic biomarker for primary open-angle glaucoma.
    Clinical and Experimental Ophthalmology 11/2013; 41(8). DOI:10.1111/ceo.12111 · 1.95 Impact Factor
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    ABSTRACT: Microorganisms contain a large number of biocatalysts, which are of great potential in industrial applications. However, the traditional cultural approaches can obtain only less than 1% of microorganisms. As a culture-independent method, metagenomics is an advanced solution by means of extracting all microbial genomic DNAs in certain environmental habitat, constructing and screening metagenomic libraries to seek novel functional genes. It serves as an effective tool for studying these uncultured microorganisms. Therefore, mining novel biocatalysts from metagenome has drawn the attention of researchers in the world. In this paper, environment sample category, genomic DNA extraction, library construction and screening strategies were reviewed. Recent examples of isolated biocatalysts from metagenomic libraries were presented. Future research directions of metagenomics were also discussed.
    Sheng wu gong cheng xue bao = Chinese journal of biotechnology 04/2012; 28(4):420-31.
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    ABSTRACT: Prebiotic galacto-oligosaccharides (GOS) were effectively synthesized from lactose in organic-aqueous biphasic media by a novel metagenome-derived β-galactosidase BgaP412. A maximum GOS yield of 46.6% (w/w) was achieved with 75.4% lactose conversion rate in the cyclohexane/buffer system [95:5 (v/v) cyclohexane/buffer] under the optimum reaction conditions (initial lactose concentration = 30% (w/v), T = 50 °C, pH 7.0, and t = 8 h). The corresponding productivity of GOS was approximately 17.5 g L(-1) h(-1). The GOS mixture consisted of tri-, tetra-, and pentasaccharides. Trisaccharides were the chief component of reaction products. These experimental results showed that a low water content, a high initial lactose concentration, and an elevated reaction temperature could significantly promote the transgalactosylation activity of β-galactosidase BgaP412; at the same time, the enhanced GOS yield in an organic-aqueous biphasic system is because of the fact that thermodynamic equilibrium can be shifted to the synthetic direction by reversing the normal hydrolysis.
    Journal of Agricultural and Food Chemistry 03/2012; 60(15):3940-6. DOI:10.1021/jf300890d · 3.11 Impact Factor
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    ABSTRACT: Pyrethroid pesticides are broad-spectrum pest control agents in agricultural production. Both agricultural and residential usage is continuing to grow, leading to the development of insecticide resistance in the pest and toxic effects on a number of nontarget organisms. Thus, it is necessary to hunt suitable enzymes including hydrolases for degrading pesticide residues, which is an efficient "green" solution to biodegrade polluting chemicals. Although many pyrethroid esterases have consistently been purified and characterized from various resources including metagenomes and organisms, the thermostable pyrethroid esterases have not been reported up to the present. In this study, we identified a novel pyrethroid-hydrolyzing enzyme Sys410 belonging to familyV esterases/lipases with activity-based functional screening from Turban Basin metagenomic library. Sys410 contained 280 amino acids with a predicted molecular mass (Mr) of 30.8 kDa and was overexpressed in Escherichia coli BL21 (DE3) in soluble form. The optimum pH and temperature of the recombinant Sys410 were 6.5 and 55°C, respectively. The enzyme was stable in the pH range of 4.5-8.5 and at temperatures below 50°C. The activity of Sys410 decreased a little when stored at 4°C for 10 weeks, and the residual activity reached 94.1%. Even after incubation at 25°C for 10 weeks, it kept 68.3% of its activity. The recombinant Sys410 could hydrolyze a wide range of ρ-nitrophenyl esters, but its best substrate is ρ-nitrophenyl acetate with the highest activity (772.9 U/mg). The enzyme efficiently degraded cyhalothrin, cypermethrin, sumicidin, and deltamethrin under assay conditions of 37°C for 15 min, with exceeding 95% hydrolysis rate. This is the first report to construct metagenomic libraries from Turban Basin to obtain the thermostable pyrethroid-hydrolyzing enzyme. The recombinant Sys410 with broad substrate specificities and high activity was the most thermostable one of the pyrethroid-hydrolyzing esterases studied before, which made it an ideal candidate for the detoxification of pyrethroids.
    Microbial Cell Factories 03/2012; 11:33. DOI:10.1186/1475-2859-11-33 · 4.25 Impact Factor
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    ABSTRACT: A novel organic solvent-stable and thermotolerant lipase gene (designated ostl28) was cloned from a metagenomic library and overexpressed in Escherichia coli BL21 (DE3) in soluble form. OSTL28 contained 262 amino acids with relative molecular mass 30.1kDa and isoelectric point 9.7. The optimum pH and temperature of the OSTL28 were 7.5 and 60°C, respectively. OSTL28 was stable in the pH range of 4.5–9.5 and at temperatures below 65°C. The enzyme could hydrolyze a wide range of ρ-nitrophenyl esters, but its best substrate is ρ-nitrophenyl laurate with the highest activity of 236U/mg (54,000U/L). The recombinant OSTL28 was highly resisted to organic solvents, especially glycerol and methanol. The metal ions, with the exception of Hg2+ and Ag+, did not have any influence on enzyme activity, whereas non-ionic surfactants and Al3+ slightly activated the enzyme. These features indicate that it is a potential biocatalyst for biodiesel production.
    Journal of Molecular Catalysis B Enzymatic 11/2011; 72(3):319-326. DOI:10.1016/j.molcatb.2011.07.009 · 2.75 Impact Factor