Contents
Ion channels ion-selective and fluctuate between open and closed states
The membrane potential in animal cells depends mainly on K⁺ leak channels and the K⁺ gradient across the plasma membrane
The resting potential decays only slowly when the Na⁺- K⁺ pump is stopped
The three-dimensional structure of a bacterial K⁺ channel shows how an ion channel can wo
Channel protein
; hydrophilic pore
Ion channel - highly selective pore
open and close
passive transport-diffuse
Nerve cell - Ion channel 이용
Ion channels ion-selective and fluctuate between open and closed states
Ion channel 의 Property
-ion selectivity
-open and close(gate)
Specific stimulus에 의해 open
The optical microscope, often referred to as the "light microscope", is a type of microscope which uses visible light and a system of lenses to magnify images of small samples. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century. Basic optical microscopes can be very simple, although there are many complex designs w
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
1. 서론
(1)배경
TV 방송 기술은 흑백 TV, 컬러 TV 시대를 거쳐 오늘날에는 아날로그 TV 방송에서 디지털 HDTV(High Definition TV) 방송으로 전환되는 시기를 맞이하고 있다. 미국, 유럽 등 산업선진국에서는 대부분 2012년까지 기존의 아날로그TV 방송을 종료하고 디지털TV 방송으로 완전 전환할 예정에