introduction : osteon® is an alloplastic material containing 70% hydroxyapatite and 30% β-tcp. calcitonin, a hormone produced by the thyroid gland, not only prevents bone resorption by reducing both the number and the activity of osteoclasts, but also stimulates bone formation. considering the favorable effects of calcitonin on bone formation, we hypothesized that the addition of calcitonin to ...

epoxy powder coatings containing zinc aluminum phosphate (zap) and zinc phosphate (zp), which are the 2nd and 1st generation of phosphate-based pigments respectively, were applied to the surface of mild steel sheets. the anticorrosive performances of the coated samples were studied using electrochemical impedance spectroscopy (eis). cathodic disbonding resistance and the adhesion performance of...

BACKGROUND Pyrimidine nucleoside phosphorylase (PYNP) catalyzes the reversible phosphorolysis of pyrimidines in the nucleotide synthesis salvage pathway. In lower organisms (e.g. Bacillus stearothermophilus) PYNP accepts both thymidine and uridine, whereas in mammalian and other higher organisms it is specific for thymidine (designated thymidine phosphorylase, TP). PYNP shares 40% sequence simi...

background and objectives: azotobacter is a diazotroph bacterium reported to possess various plant growth-promoting characteristics.the aim of this study was to isolate azotobacter strains capable of fixing nitrogen and effectively hydrolyzing both organic and inorganic pi compounds. materials and methods: in this study, soil samples collected from a diverse range of slightly alkaline soil type...

objective:   intractable epilepsy is a serious neurologic problem with different etiologies. decreased levels of pyridoxal phosphate in central spinal fluid level of patients with intractable epilepsy due to pyridoxine dependency epilepsy were reported. the aim of this study was to compare plasma pyridoxal 5´-phosphate level in patients with intractable and controlled epilepsy. materials   &   ...

objectives: the aim of this study was to evaluate and compare the retentive strength of orthodontic bands cemented with amorphous calcium phosphate (acp)-containing and conventional glass ionomer cements (gics). materials and methods: one-hundred-and-twenty mandibular third molars were embedded in acrylic resin blocks with the buccal surface of crowns perpendicular to the base of the mold. the ...

partial least squares modeling as a powerful multivariate statistical tool was applied tothe simultaneous spectrophotometric determination of silicate and phosphate in aqueoussolutions. the concentration range for silicate and phosphate were 0.02-0.6 and 0.4-3 μg ml-1,respectively. the experimental calibration set was composed with 30 sample solutions using amixture design for two component mix...

the variations of glucose 6-phosphate dehydrogenase (g6pd) activity in different brain regions of normal, hypo- and hyperthyroid rats were investigated. hypo- and hyperthyrodism were experimentaly induced by administration of methimazol and liothyronine, respectively. in normal rats, midbrain had the minimum (70 mu/mg) and cerebral cortex the maximum (349 mu/mg) g6pd activity. hyperthyrodism in...