Angebote zu "Studies" (5 Treffer)

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Anti-tumour Properties of Iraqi Propolis: in vi...
79,00 € *
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Healing properties of propolis are known in folk medicine from antiquity, however, recently, the interest in propolis as a potential natural product is increasing because of its broad spectrum of biological properties. It is an anti-flammatory agent, an immunostimulant, anti-oxidant, anti-microbial, and it is also an anti-tumour and a carcinostatic agent. This study was undertaken to characterize the chemical compounds, and antioxidant and anti-tumour potentials of propolis samples collected from five different geographical locations in Iraq using in vitro and in vivo studies. Thirty-eight different compounds were identified, and clerodane diterpenoids were identified for first time in temperate zone. All propolis samples exhibited strong free radical scavenging activity. The in vitro evaluations by growth inhibition, clonogenicity and flow cytometric assays showed that propolis has cytotoxic effects on two human cell lines. The in vivo potentials were also recorded on the growth of HCT-116 xenografts in a nude mouse model. This study provides the rationale to investigate the potential beneficial effect of propolis in the diet of patients receiving anti-cancer therapies.

Anbieter: Dodax
Stand: 17.02.2020
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Effectiveness of Using Teaching Strategies for ...
63,90 € *
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The main purpose of this study was to investigate the effectiveness of teaching strategies that engage college students who experienced childhood difficulties in learning mathematics in the United Arab Emirates (UAE) in terms of the nature of the classroom learning environment and students satisfaction. In addition, I investigated how the use of personally-relevant and concrete activities changed the learning environment in ways that were perceived to be beneficial by adults who had experienced failure.A sample of 84 students from eight classes in the Higher Colleges of Technology (HCT) were involved. The learning environment was assessed as a pretest and posttest with a modified Arabic version of four scales (Involvement, Task Orientation, Personalisation and Individualisation) from the College and University Classroom Environment Inventory (CUCEI). Satisfaction was measured with a modified Arabic version of this scale from the CUCEI. Moreover, five case studies of students were conducted to assess the learning environment through observations, semi-structured interviews and focus-group interviews and to link qualitative information with the constructs assessed by the CUCEI.

Anbieter: Dodax
Stand: 17.02.2020
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Modern Methods for Microdetermination of Some D...
59,00 € *
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ABSTRACT The studies presented in this work include novel analytical methods based on spectrofluorimetric techniques for determination of some organic compounds used in pharmaceutical preparations. The work is divided to three chapters. The first chapter includes general introduction of spectrofluorimetric activity of lanthanide elements and the parameters affects on these phenomena. Also, the chapter involved the review of literature for previous methods of metoclopramide and hydrochlorothiazide drugs determination. The second chapter deals with the materials and apparatus used during this work including the types, grades, sources and preparations of these materials. Also, include the methods for measurements of different factors as absorbance, excitation and emission, effect of pH, effect of reagents and the validity tests of the metoclopramide and hydrochlorothiazide proposed methods as selectivity, recovery, precision and stability. The third chapter includes the results and discussion of the proposed methods for determination of metoclopramide hydrochloride (MCP) and hydrochlorothiazide (HCT).

Anbieter: Dodax
Stand: 17.02.2020
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Synthesis, spectroscopy, biological activity of...
69,90 € *
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A new Schiff base ligand (HL) derived from the condensation of quinoline-2-carboxaldehyde with 2-aminophenol and its mixed ligand complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) vis 2,2'-bipyridine/1,10-phenanthroline as secondary ligand have been synthesized and characterized by elemental analyses, spectroscopic studies (IR, mass spectra, 1H NMR, UV-vis, magnetic susceptibility and solid reflectance), molar conductance, x-ray diffraction, ESR and thermal studies. The kinetic and thermodynamic parameters were calculated using the Coats-Redfern and HorowitzMetzger methods. Also, Schiff base ligand and its mixed ligand complexes were screened against Gram positive bacteria (Streptococcus pneumoniae and Bacillis subtilis) and Gram negative bacteria (Pseudomonas aeruginosa and Escherichia coli). Antifungal activity was carried out against (Aspergillus fumigatus and Candida albicans). In addition, anti-cancer activity of Schiff base ligand and its mixed ligand complexes were also tested against breast cancer cell line (MCF-7) and colon cancer cell line (HCT-116).

Anbieter: Dodax
Stand: 17.02.2020
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