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Mechanical Properties and Biocompatibility of a Biomaterial Based on Deproteinized Hydroxyapatite and Endodentine Cement

Abstract

Hydroxyapatite is used for bone reconstruction, in order to improve its mechanical properties different substances can be added. In our study new biomaterial is created from deproteinised hydroxyaptite and endodentic cement, its mechanical properties were tested. Material was implanted subcutaneous in rats, then histological and biocompatability tests were performed. Results indicate that stuff has good mechanical properties, short setting time and gradual resorption creating porosity and ability to integrate in bone.

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Properties of the Jurassic Clayey Deposits of Southwestern Latvia and Northern Lithuania / Dienvidrietumu Latvijas un Ziemeļlietuvas juras mālaino nogulumu īpašības

., Zaton, M., Hautevelle, Y. Systematic relationships of the Mesozoic wood genus Xenoxylon: an integrative biomolecular and palaeobotanical approach. 2008, Neues Jahrb. Geol. Palaontol. Abhandlungen, vol. 247, no. 2, pp. 177-189. http://dx.doi.org/10.1127/0077-7749/2008/0247-0177 8. Marynowski, L., Zatoń, M., Karwowski, Ł. Early diagenetic conditions during formation of the Callovian (Middle Jurassic) carbonate concretions from Łukow (eastern Poland): evidence from organic geochemistry, pyrite framboid diameters and petrographic study. 2008, Neues

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The regional approach and regional studies method in the process of geography teaching

Abstract

We define the regional approach as a manner of relations among the global trends of development of the “Society-man-nature” system and the local differentiating level of knowledge. Conditionally, interactions interlace under the influence of the character of Geography as a science, education, approaches, goals and teaching methods.

Global, national and local development differentiates in three concentric circles at the level of knowledge. It is determined as a conception of modern, complex and effective mechanism for young people, through which knowledge develops in regional historical and cultural perspective; self-consciousness for socio-economic and cultural integration is formed as a part of the. historical-geographical image of the native land. This way an attitude to the. native land is formed as a connecting construct between patriotism to the motherland and the same in global aspect.

The possibility for integration and cooperation of the educative geographical content with all the local historical-geographical, regional, profession orientating, artistic, municipal and district institutions, is outlined.

Contemporary geographical education appears to be a powerful and indispensable mechanism for organization of human sciences, while the regional approach and the application of the regional studies method stimulate and motivate the development and realization of optimal capacities for direct connection with the local structures and environments.

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Aerosol and gamma background measurements at Basic Environmental Observatory Moussala

Abstract

Trans boundary and local pollution, global climate changes and cosmic rays are the main areas of research performed at the regional Global Atmospheric Watch (GAW) station Moussala BEO (2925 m a.s.l., 42°10’45’’ N, 23°35’07’’ E). Real time measurements and observations are performed in the field of atmospheric chemistry and physics. Complex information about the aerosol is obtained by using a threewavelength integrating Nephelometer for measuring the scattering and backscattering coefficients, a continuous light absorption photometer and a scanning mobile particle sizer. The system for measuring radioactivity and heavy metals in aerosols allows us to monitor a large scale radioactive aerosol transport. The measurements of the gamma background and the gamma-rays spectrum in the air near Moussala peak are carried out in real time. The HYSPLIT back trajectory model is used to determine the origin of the data registered. DREAM code calculations [2] are used to forecast the air mass trajectory. The information obtained combined with a full set of corresponding meteorological parameters is transmitted via a high frequency radio telecommunication system to the Internet.

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Electronic setup for fluorescence emission measurements and long-time constant-temperature maintenance of Single-Walled Carbon Nano-Tubes in water solutions

., Carbon nanotubes: Synthesis, integration, and properties, Acc Chem Res, 2002, 35: 1035 - 1044. [6] Dresselhaus M., Dai H., Special Issue on Carbon Nanotube, MRS bull., 2004 Vol. 29. 2004. [7] Golberg D., Costa P.M.F.J., Mitome M., Bando Y., Nanotubes in a gradient electric field as revealed by STM-TEM technique, Nano Res, 2008, 1: 166 - 175. [8] Zhou W., Rutherglen C., Burke P., Wafer scale synthesis of dense aligned arrays of single walled carbon nanotubes, Nano Res., 2008, 1: 158 - 165. [9] Reich S

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