detector)에 의해 수집되어 그 결과 생긴 신호들이 여러 점으로부터 모여들어 음극선관(cathod ray tube)에 상을 형성한다. 주사전자현미경의 특징은 초점이 높은 심도를 이용해서 비교적 큰 표본을 입체적으로 관찰 할 수 있다는 것이다.
두 가지 전자현미경의 차이를 보면, TEM은 얇은 시편을 beam이 투과하여
1. Monolayer of molecules formed by self-assembly ie., the structures are formed
without external intervention.
2. The structure is organized by utilizing weak interactions such as
H-bonding, van der Waals interactions and there are numerous
interactions of this kind in a structure which make it stable.
3. Nature uses the same process of self-assembly to produce comple
5.2 Drug Delivery System
5.2.1 Advantage of Nano-drug delivery system
By diagnosis, and for treatment, we need enhanced drug delivery system. Drug delivery system of these days is just eat and let it flow through the body. It is not good at efficiency. Because the digestive system sometimes digest and remove the drug before it reaches to the target.
For enhancing the efficiency of drug
Nanoparticles present possible dangers
- due to the high surface to volume ratio
pass through cell membranes in organisms
Smaller nanoparticles evinced increased cytotoxicity.
Self-assembly :
process that disordered system of components forms an organized structure or pattern
The device is switched on - >
the pump pushes ions across the lipid membrane,
(4) Double patterning
The double patterning is divided into four parts, leading with wafer requirements and then two sets of lithographic requirements (Generic Pitch Splitting - Double Patterning Requirements Driven by MPU metal Half-Pitch and Generic Spacer Patterning Requirements - Driven by Flash). The lithography requirements are different for each process; the requirements for pitch splitti
Recent Situation
“ internal information security attacks are outgrowing external
attacks at the world’s largest financial institutions”
(The Global Security Survey): Only 20% of the respondents in security survey strongly
believed that Information security should be a CEO-level priority
Ernst and Young(2004)
2) IT liability risk management
: The corporations should install f
Furnace Open
Probe Zero Length
Probe Up → Sample Loading
Measure : Sample 초기길이측정
Test 조건 설정 후Furnace Close
약간의 안정화Time 거친 후 Start
Thermal Expansion
Glass transition, softening
Melting point
Creep/stress relaxation
Young's modulus
→ 고분자 물질의 특성 분석에 적합
양전자(positron) : 전자의 반입자 (질량
Lipopolysaccharides (LPS), also known as lipoglycans,
are large molecules consisting of a lipid and a polysaccharide
joined by a covalent bond; they are found in the outer
membrane of Gram-negative bacteria, act as endotoxins and
elicit strong immune responses in animals.
LPS is the major component of the outer membrane of
Gram-negative bacteria, contributing greatly to the structu
1) 용매(이동상,Eluent)
LC의 원리는 이동상인 전개용매, 고정상인 컬럼의 특성, 시료의 성분들과의 상호작용에 의해 분리가 되기 때문에 단일 또는 혼합용매의 선택은 매우 중요하다. 즉 분석대상 물질에 따라 용매를 선택하고 조성 비율을 결정하게 된다. 보통 사용되는 용매는 메탄올, 아세토니트릴, 물
※Genomics란?
게노믹스(genomics)란 어떤 생물체의 유전자(gene)와 염색체(ch romosome) 집합인 게놈(genome)정보를 다루는 분야다. 구체적으로는 게놈의 서열을 밝히고 이를 지도(map)로 만들어 분석, 응용하는 과정을 말한다. 90년대 이후 바이오산업은 정보기술의 발달에 힘입어 유전자와 단백질 및 그 기능 등