The linker histones (H1 or H5) which play a key role in the folding of chromatin, are general repressors of gene expression. Nuclei of the mature chicken erythrocytes (and in some mammalian cells) contain both of them. Although the interaction of H5 with DNA is stronger than that of H1, it does not prevent the transcription of some erythroid-specific genes. It has been shown that some modificat...

External sulfate attack of concrete is a major problem that can appear in regions where concrete is exposed to soil or water containing sulfates, leading to softening and cracking of the concrete. Therefore, it is important that materials selection and proportioning of concrete in susceptible regions be carefully considered to resist sulfate attack. American Society for Testing Materials (ASTM)...

INTRODUCTION Recently, novel polymers including polyetheretherketone (PEEK) and carbon fiber reinforced polymer (CFRP) have been used for spinal cages because of their advantages such as radiolucency, low incidence of artifacts on magnetic resonance imaging scans, less bone subsidence, and the capacity to tailor its mechanical properties, as well as its safety for patients with metal allergies....