Heparinized collagen-based hydrogels for tissue engineering: physical, mechanical and biological properties.

As the main protein forming the vascular extracellular matrix, collagen has a weak antigenicity, making it an attractive candidate for coatings of vascular grafts. In order to bring antithrombotic properties to collagen for obtaining suitable blood compatibility of surfaces and further bioactive molecule carrying capacity, heparinization appears as a method of choice. Thus, in this article, pH-driven self-assembly was used to form collagen-based hydrogels with physical incorporation of heparins, especially low molecular weight heparin or unfractionated heparin at 1 IU/mL and 6 IU/mL.

Children and Youth with Special Health Care Needs: Progress Towards More Family-Centered Systems of Care.

Children and youth with special health care needs have increasingly been included in community and society over the past 50 years. Changing definitions and programs in the education, health, and public health/Title V sectors document this greater inclusion. The most profound change was in the education system, with the passage of legislative mandates for inclusion and parental rights.