LINKED ARTICLES

Determination of glycyrrhizin in Chinese prescriptions and biological samples by enzyme-linked immunosorbent assay [An article from: Analytica Chimica Acta]
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This digital document is a journal article from Analytica Chimica Acta, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
In the work described on this paper, a highly specific and sensitive enzyme-linked immunosorbent assay (ELISA) for the determination of glycyrrhizin (GL) was developed. To demonstrate the potential of the ELISA, a preliminary pharmacokinetic study of GL in rats and quantitative analysis of GL in several Chinese prescriptions were performed and compared with high-performance liquid chromatography (HPLC). The experimental data indicated that ELISA method exhibits more advantages over HPLC, such as lower detection limit, high specificity, low background and no requirement of sample pre-treatment, and more suitable for the determination of natural components in Chinese traditional medicines.

Competitive adsorption of dye metanil yellow and RB15 in acid solutions on chemically cross-linked chitosan beads [An article from: Chemosphere]
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This digital document is a journal article from Chemosphere, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
One kind of adsorbent with a high adsorption capacity for anionic dyes was prepared using ionically and chemically cross-linked chitosan beads. A batch system was applied to study the adsorption behavior of one acid dye (MY, metanil yellow) and one reactive dye (RB15, reactive blue 15) in aqueous solutions by the cross-linked chitosan beads. The adsorption capacities was 3.56mmolg^-^1 (1334mgg^-^1) for dye MY and 0.56mmolg^-^1 (722mgg^-^1) for dye RB15 at pH4, 30^oC. The Langmuir model agreed very well with the experimental data (R^2>0.996). The kinetics of adsorption for a single dye and the kinetics of removal of ADMI color value in mixture solutions at different initial dye concentrations were evaluated by the nonlinear first-order and second-order models. The first-order kinetic model fits well with the dynamical adsorption behavior of a single dye for lower initial dye concentrations, while the second-order kinetic model fits well for higher initial dye concentrations. The competitive adsorption favored the dye RB15 in the mixture solution (initial conc. (mM): MY=1.34; RB15=1.36); while it favored the dye MY in the mixture solution (initial conc. (mM): MY=3.00; RB15=1.34) and the adsorption kinetics for dye RB15 has the tendency to shift to a slower first order model.

Effect of vitamin C and folic acid on seed vigour response and phenolic-linked antioxidant activity [An article from: Bioresource Technology]
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This digital document is a journal article from Bioresource Technology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Folic acid and vitamin C were used in the concentration range of 0-500@mM as exogenous growth enhancers to stimulate pea (Pisum sativum) seedling vigour. The results suggest that a concentration of 50@mM folic acid and 500@mM vitamin C were optimum in maximally enhancing seed vigour and potentially seedling performance according to both agronomic and biochemical seed vigour parameters. Results indicated that germination percentage, shoot weight, shoot height, and root length were enhanced in folic acid and vitamin C treated plants compared to control plants. The levels of enhanced phenolic content in response to folic acid and vitamin C treatments were highest on days 8 and 10. Evaluation of critical biochemical parameters indicated that the average glucose-6-phosphate dehydrogenase (G6PDH) activity and proline content in response to treatments were higher than control and correlated to enhanced phenolic content and DPPH-based antioxidant activity. Key enzymes, guaiacol peroxidase (GPX), superoxide dismutase (SOD), and catalase (CAT) were also higher in response to treatments and correlated to enhanced phenolic content and DPPH-based antioxidant activity. Taken together, these studies support the hypothesis that the proline-linked pentose phosphate pathway stimulates phenolic synthesis and related free-radical scavenging antioxidant activity. Further, this proline-linked pentose phosphate pathway stimulation in response to folic acid and vitamin C was also correlated to antioxidant enzyme response indicated by the stimulation of GPX, SOD, and CAT activities. Therefore, this study indicates the enhancement of seed vigour response by folic acid and vitamin C as reflected in both agronomic and biochemical responses, and this occurred through the stimulation of phenolic-linked antioxidant response that is likely positively modulated through the proline-linked pentose phosphate pathway.

Do exporters really pay higher wages? First evidence from German linked employer-employee data [An article from: Journal of International Economics]
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This digital document is a journal article from Journal of International Economics, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Many plant-level studies find that average wages in exporting firms are higher than in non-exporting firms from the same industry and region. This paper uses a large set of linked employer-employee data from Germany to analyze this exporter wage premium. We show that the wage differential becomes smaller but does not completely vanish when observable and unobservable characteristics of the employees and of the workplace are controlled for. For example, blue-collar (white-collar) employees working in a plant with an export-sales ratio of 60% earn about 1.8 (0.9) % more than similar employees in otherwise identical non-exporting plants.