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  • 1
    Electronic Resource
    Electronic Resource
    Two Convergence Problems for Monotone Sequences (1997)
    Springer
    Acta applicandae mathematicae 47 (1997), S. 213-220 
    Details
    ISSN: 1572-9036
    Keywords: convergence ; convergence rate ; convergence order ; sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Eight measures of rate of convergence of monotone sequences of real numbers have been proposed and discussed in a paper by Beyer, Ebanks, and Qualls (Acta Appl. Math. 20 (1990), 267–284). These rates arose in discussions of dynamical systems. In the comparisons of these rates, two problems remained. A complete answer is given to one of the problems and a partial answer is given to the other problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017942721082
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of Fe/Si heterostructure grown by MOCVD (1990)
    Springer
    Applied physics 50 (1990), S. 237-239 
    Details
    ISSN: 1432-0630
    Keywords: 68.55.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An Fe film was grown on an Si(100) substrate by metalorganic chemical vapor deposition (MOCVD) using thermal decomposition of iron pentacarbonyl, Fe(CO)5. The X-ray diffraction and cross-sectional high resolution electron microscopy (HREM) show that the Fe deposited film is a single crystal Fe film on Si(100). Single crystal Fe/Si Schottky barrier diodes exhibit good rectification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343424
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  • 3
    Electronic Resource
    Electronic Resource
    Inducible removal of UV-induced pyrimidine dimers from transcriptionally active and inactive genes of Saccharomyces cerevisiae (1993)
    Springer
    Molecular genetics and genomics 239 (1993), S. 28-32 
    Details
    ISSN: 1617-4623
    Keywords: Saccharomyces cerevisiae ; UV damage ; Mating type ; Inducible repair
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The prior UV irradiation of α haploid Saccharomyces cerevisiae with a UV dose of 25 J/m2 substantially increases the repairability of damage subsequently induced by a UV dose of 70 J/m2 given 1 h after the first irradiation. This enhancement of repair is seen at both the MATa and HMLα loci, which are, respectively, transcriptionally active and inactive in α haploid cells. The presence in the medium of the protein synthesis inhibitor, cycloheximide in the period between the two irradiations eliminated this effect. Enhanced repair still occurred if cycloheximide was present only after the final UV irradiation. This indicated that the first result is not due to cycloheximide merely blocking the synthesis of repair enzymes associated with a hypothetical rapid turnover of such molecules. The enhanced repairability is not the result of changes in chromatin accessibility without protein synthesis, merely caused by the repair of the damage induced by the prior irradiation. The data clearly show that a UV-inducible removal of pyrimidine dimers has occurred which involves the synthesis of new proteins. The genes known to possess inducible promoters, and which are involved in excision are RAD2, RAD7, RAD16 and RAD23. Studies with the rad7 and rad16 mutants which are defective in the ability to repair HMLα and proficient in the repair' of MATα showed that in rad7, preirradiation enhanced the repair at MATα, whereas in rad16 this increased repair of MATα was absent. The preirradiation did not modify the inability to repair HMLα in either strain. Thus RAD16 has a role in this inducible repair. Inducible repair is also absent in a rad2 strain which cannot repair MATα or HMLα after a single UV dose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281597
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  • 4
    Electronic Resource
    Electronic Resource
    Dehydrogenation of methanol to methyl formate over CuO−SiO2 gel catalyst (1999)
    Springer
    Reaction kinetics and catalysis letters 67 (1999), S. 95-102 
    Details
    ISSN: 1588-2837
    Keywords: CuO−SiO2gel ; methanol dehydrogenation ; methyl formate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CuO−SiO2 gel catalysts were prepared by sol-gel method and were characterized by UV-Visible diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD) and temperature-programmed reduction (TPR). It was found that the copper loadings have a strong influence on the reduction and catalytic properties of CuO−SiO2 gels. A great part of copper oxide is highly dispersed as confirmed by TPR, XRD and DRS data. The catalysts are shown to be active and selective toward methyl formate formation in methanol dehydrogenation due to the presence of highly dispersed copper over SiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475833
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  • 5
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    Prevalence and risk factors for diabetic retinopathy in a high-risk Chinese population (2013)
    BioMed Central
    Details
    Publication Date: 2013-07-06
    Description: Background: Lifestyle plays an important role in the development of diabetic retinopathy. The lifestyle in Guangzhou is different from other cities in China as the Cantonese prefer eating rice porridge, but not spicy foods. The objectives of this study were to investigate the prevalence and determinants of diabetic retinopathy in a high-risk population of Guangzhou. Methods: Subjects (619 totals) aged over 45 years old, without known diabetes were recruited from five randomly selected Guangzhou communities in 2009--2010. All participants were invited to complete the Finnish Diabetes Risk Score (FINDRISC) questionnaire. Subjects with FINDRISC score 〉= 9 were included in the study, and underwent an investigation of demographic data, a standardized physical examination, ocular fundus examination, and laboratory analyses. The minimum criterion for diagnosis of diabetic retinopathy was the presence of at least one microaneurysm. Results: Of 619 subjects, 208 eligible subjects (122 women) with FINDRISC score 〉= 9 were included in the study. The mean age was 69.2 +/- 8.5 years. Diabetic retinopathy was detected in 31 subjects, and the prevalence of diabetic retinopathy in subjects with high risk for diabetes was 14.9%. In binary logistic regression analysis, risk factors associated with diabetic retinopathy were history of impaired glucose regulation [odds ratio (OR), 7.194; 95% confidence interval (CI): 1.083, 47.810], higher hemoglobin A1c (HbA1c; OR, 2.912; 95% CI: 1.009, 8.402), higher two-hour postprandial plasma glucose level (OR, 1.014; 95% CI: 1.003, 1.025), and presence of microalbuminuria (OR, 5.387; 95% CI: 1.255, 23.129). Conclusions: Diabetic retinopathy was prevalent in a high-risk Chinese population from Guangzhou. Histories of impaired glucose regulation and microalbuminuria were strong risk factors for diabetic retinopathy.
    Electronic ISSN: 1471-2458
    Topics: Medicine
    Published by BioMed Central
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  • 6
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    Prevalence of obesity and overweight among Chinese children with attention deficit hyperactivity disorder: a survey in Zhejiang Province, China (2013)
    BioMed Central
    Details
    Publication Date: 2013-05-11
    Description: Background: Attention Deficit Hyperactivity Disorder (ADHD) is often comorbid with psychiatric and developmental disorders. This study aimed to investigate the prevalence of obesity and overweight among Chinese children with ADHD, and to explore which subtypes of the disorder may specifically be associated with obesity/overweight. Methods: Children meeting the DSM-IV criteria for ADHD were enrolled in the study. Weight, weight z-score, height, height z-score, BMI, and BMI z-score were used to evaluate growth status. Obesity and overweight were determined using the National Growth Reference for Chinese Children and Adolescents. Relations between the prevalence of obesity/overweight and different ADHD subtypes and pubertal development were analyzed. Results: A total of 158 children with ADHD (mean age: 9.2 years) were recruited for the study. The prevalences of obesity, overweight, and combined obesity/overweight were 12.0%, 17.1%, and 29.1%, respectively, which were significantly higher than in the general Chinese population (2.1%, 4.5%, and 6.6%, respectively). Multivariable analysis showed that the children with the combined subtype of ADHD and the onset of puberty were at a higher risk of becoming obese or overweight. Conclusions: The prevalence of obesity in Chinese children with ADHD is higher than that of the general population. Children with the ADHD combined subtype who were at the onset of puberty were more likely to be overweight or obese.
    Electronic ISSN: 1471-244X
    Topics: Medicine
    Published by BioMed Central
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  • 7
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    The prognostic significance of lymphovascular invasion in patients with resectable gastric cancer: a large retrospective study from Southern China (2015)
    BioMed Central
    Details
    Publication Date: 2015-05-08
    Description: Background: The focus of this study was to assess the impact of lymphovascular invasion (LVI) on both the recurrence of cancer and the long-term survival of Chinese patients with resectable gastric cancer (GC). Methods: A retrospective analysis of the clinicopathological data for 1148 GC patients who had undergone gastrectomy with regional lymphadenectomy was performed. The primary objective was to assess the correlation between LVI and post-surgery outcomes for each patient. This was done by routine H & E staining for LVI on patients’ disease-free survival (DFS) and disease-specific survival (DSS). Results: LVI was detected in 404 (35.2%) of the 1148 GC patients. The presence of LVI was significantly correlated with the level of CA19-9, the tumor size, the Lauren classification, tumor differentiation, gastric wall invasive depth, lymph node involvement, distant metastasis and an advanced TNM stage. There was a lower DFS and DSS in the patients with LVI as compared to the patients without LVI. A multivariate analysis also identified LVI as an independent prognostic factor of both DSS and DFS. Conclusions: The presence of LVI is a risk factor for the recurrence of cancer and an independent indicator of a poor outcome in GC patients following surgery. The LVI status should be taken into consideration when determining the best approach for the treatment of the individual.
    Electronic ISSN: 1471-2407
    Topics: Medicine
    Published by BioMed Central
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  • 8
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    Prevalence and risk factors of primary open-angle glaucoma in a city of Eastern China: a population-based study in Pudong New District, Shanghai (2015)
    BioMed Central
    Details
    Publication Date: 2015-10-15
    Description: Background: The aim of the present study was to investigate the prevalence and characteristics of primary open-angle glaucoma among the urban population of Pudong New District, Shanghai. Methods: Three residents’ committees were randomly selected from Pudong New District, and residents aged 50 and older were screened for primary open-angle glaucoma (POAG) from March to April 2011. In remote screening, the tests on visual acuity, refraction, intraocular pressure (IOP), and the photographs of anterior segment and fundus were used to identify POAG suspect. The suspected subjects were then reexamined with the tests on IOP, gonioscopy, Humphrey visual field test, and retinal nerve fiber layer (RNFL) thickness by optical coherence tomography (OCT). POAG was diagnosed according to the criteria defined by International Society for Geographic and Epidemiological Ophthalmology (ISGEO). Finally, POAG risk factors were evaluated using logistic regression analysis. Results: A total of 2528 citizens out of 3,146 eligible residents (80.36 %) participated in this study. Among the citizens, 72 were diagnosed to have POAG, giving the crude prevalence rate of 2.85 % (95 % CI:2.20 %–3.50 %) in general and age- and gender-adjusted prevalence rate of 2.8 % (95 % CI: 2.78 %–2.83 %). Among the 72 POAG patients, only 22 cases had IOP exceeding 21 mmHg while other 50 cases had IOP of 21 mmHg or less; nine cases had one eye blind (12.5 %). Intriguingly, only eight cases (11.11 %) had been diagnosed with POAG before this screening. Conclusions: More efforts are required for early screening and education on POAG in communities, especially in a POAG high-risk population.
    Electronic ISSN: 1471-2415
    Topics: Medicine
    Published by BioMed Central
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  • 9
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    Genome-wide variations in a natural isolate of the nematode Caenorhabditis elegans (2014)
    BioMed Central
    Details
    Publication Date: 2014-04-03
    Description: Background: Increasing genetic and phenotypic differences found among natural isolates of C. elegans have encouraged researchers to explore the natural variation of this nematode species. Results: Here we report on the identification of genomic differences between the reference strain N2 and the Hawaiian strain CB4856, one of the most genetically distant strains from N2. To identify both small- and large-scale genomic variations (GVs), we have sequenced the CB4856 genome using both Roche 454 (~400 bps single reads) and Illumina GA DNA sequencing methods (101 bps paired-end reads). Compared to previously described variants (available in WormBase), our effort uncovered twice as many single nucleotide variants (SNVs) and increased the number of small InDels almost 20-fold. Moreover, we identified and validated large insertions, most of which range from 150 bps to 1.2 kb in length in the CB4856 strain. Identified GVs had a widespread impact on protein-coding sequences, including 585 single-copy genes that have associated severe phenotypes of reduced viability in RNAi and genetics studies. Sixty of these genes are homologs of human genes associated with diseases. Furthermore, our work confirms previously identified GVs associated with differences in behavioural and biological traits between the N2 and CB4856 strains. Conclusions: The identified GVs provide a rich resource for future studies that aim to explain the genetic basis for other trait differences between the N2 and CB4856 strains.
    Electronic ISSN: 1471-2164
    Topics: Biology
    Published by BioMed Central
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  • 10
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    Increased enzymatic hydrolysis of sugarcane bagasse by a novel glucose- and xylose-stimulated β-glucosidase from Anoxybacillus flavithermus subsp. yunnanensis E13T (2017)
    BioMed Central
    Details
    Publication Date: 2017-03-18
    Description: β-Glucosidase is claimed as a key enzyme in cellulose hydrolysis. The cellulosic fibers are usually entrapped with hemicelluloses containing xylose. So there is ongoing interest in searching for glucose- and x...
    Electronic ISSN: 1471-2091
    Topics: Chemistry and Pharmacology
    Published by BioMed Central
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