Enamel
√ Hard and white substance covering the teeth
√ The hardest and most highly mineralized
√ Protects the fragile underlying parts of the teeth
√ Covers the crown and supported by dentin
Component of enamel
√ 96% of enamel : mineral, water, organic material
√ contain two unique classes of proteins amelogenins and enamelins
√ The basic unit of enamel is called
Protect underlying tissues from injury: mechanical, heat, cold, biological
Prevent excess water loss
Act as a temperature regulator
Serve as a reservoir for food and water: adipose tissue
Serve as a sense organ for cutaneous senses: pain, heat, cold, pressure, touch
Prevent entrance of foreign bodies: microorganisms.
Epidermis
Keratinocytes, melanocytes
About 0.2mm thickness
Provide v
and multifunctionality, nanoparticles have emerged as potential drug delivery carriers to tissues throughout the body. Yet passing the BBB is particularly difficult. The proper design of such engineered ‘nanocarriers’ becomes very important in transversing the impermeable membranes to facilitate drug delivery. At the same time, it is also required to retain the drug stability and ensure that
and south korea. south korea adminstration based on a presidential system run all politics with responsibility. There is checks and balances by dividing the adminstration and the legislative branch. On the other side coin, Germany is a parliamentary government. a cabinet is organized based on trust of assembly and a prime minister have a politcal power. So, there is cooperation of parliamentary
organization.
Stafford Beer and Ross Ashby (1964) said that “Variety absorbs Variety.” The concepts mean the minimum number of choices that is necessary to avoid uncertainty. It can be used to allocate management resources necessary to maintain process viability. The company has to try increasing their own variety in order to better control the variety of the environment.
Variety attenu