Biological materials science focuses on the structure–function–property–processing paradigm, a common theme in materials science. However, synthesis and growth of natural materials is quite different from that of synthetic materials. Almost all biological systems follow six fundamental design principles.1–3 • Water. Although essential for biological systems, synthetic materials typically avoid ...

this research was carried out to investigate the role of natural resources cooperatives in ecotourism development. this was an analysis-descriptive study conducted through survey method. statically population of study was 123 members of the directors of these cooperatives. a structured questionnaire was designed and distributed among the cooperative directors. census technique was applied in th...