نتایج جستجو برای: organic matrix
تعداد نتایج: 559815 فیلتر نتایج به سال:
thin films of polymer doped with nonlinear optical organic dye, disperse red 1, at thickness of 1 to 2 micrometers, were prepared and studied. in order to induce an axial and orientational alignment of dye molecules within polymer matrix, a contact electric field poling was used. by this process the inherent inversion symmetry in the polymer matrix was eliminated to achieve the desired macrosco...
In this study, a polymer-silica nanocomposite using the sol-gel method was synthesized in three steps at room temperature. The nanocomposite material was formed with an organic compound (polyethylene glycol) and inorganic silica nanoparticles. Furthermore, the size and the distribution of nanoparticles in the polymer matrix were characterized by a transmission electron microscope (TEM). In add...
Correspondence to: Sérgio Roberto Peres Line Faculdade de Odontologia de Piracicaba UNICAMP Avenida Limeira, 901, Areião CEP: 13.414-903 Caixa Postal: 52 Piracicaba-SP, Brasil Phone:+55-19-3412-5333 E-mail: [email protected] Abstract Dental enamel is the most mineralized tissue in the vertebrate body and contains the largest known biologically formed hydroxyapatite crystals. Its formation ...
تشکیل پیریت اتوژنیک به روش ژئومیکروبیولوژی در آزمایشگاه و کاربرد آن در رسوبهای دریایی جنوب شرق ژاپن
Bacterial and Archeae colonies in marine sediment play important role in methane production and precipitation of authigenic minerals such as pyrite in the Nankai sedimentary basin in south east of Japan. Authigenic pyrite precipitates in anerobic condition, whithout light and in suitablet medium by sulfate-reducing bacteria (SRB). These bacteria are mezophile and heterotroph. pH and Eh of mediu...
Unusually for invertebrates, linguliform brachiopods employ calcium phosphate mineral in hard tissue formation, in common with the evolutionarily distant vertebrates. Using solid-state nuclear magnetic resonance spectroscopy (SSNMR) and X-ray powder diffraction, we compare the organic constitution, crystallinity and organic matrix-mineral interface of phosphatic brachiopod shells with those of ...
In recent years, the important role of the organic matrix for the mechanical properties of bone has become increasingly apparent. It is therefore of great interest to understand the interactions between the organic and inorganic constituents of bone and learn the mechanisms by which the organic matrix contributes to the remarkable properties of this complex biomaterial. In this paper, we presen...
Decreased E2 levels after menopause cause bone loss through increased penetrative resorption. The reversal effect of E2 substitution therapy is well documented in vivo, although the detailed mechanism of action is not fully understood. To study the effects of E2 on bone resorption, we developed a novel in vitro bone resorption assay in which degradation of inorganic and organic matrix could be ...
An organic matrix consisting of a protein-polysaccharide complex is generally accepted as an important medium for the calcification process. While the role this "calcified organic matrix" plays in the calcification process has long been appreciated, the complex mixture of proteins that is induced and assembled during the mineral phase of calcification remains uncharacterized in many organisms. ...
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