up to 60% of the dry mass of feces
If bacterium has 1㎛ diameter, the length of 100 trillion bacteria is about 100 thousand kilometer.
It means we can turn around the earth twice and half with these bacteria.
Functions of gut flora in human body
Carbohydrate fermentation and absorption
Trophic effects
Repression of pathogenic microbial growth
Metabolic function
Preventing allergy
preservation technologies. Various modern technologies are applied to inhibit the growth of micro-organisms in food product as various food-spoilage micro-organisms are exit. Consequently, the techniques are so complicated and diverse to state in one paragraph. This report divides the methods into several categories, physical, biological, and chemical, and introduces each technology briefly.
현대농업은 안전한 먹거리 생산과 환경보전의 목표를 달성할 수 있는 지속가능한 친환경농업으로 전개되고 있다. 농업환경과 관련되어 지속가능성에 영향을 미칠 수 있는 토양오염, 수질오염 및 대기오염의 각각의 특성과 주요 원인들에 대하여 설명하시오.
1. 토양오염
환경오염에는 토양오염,
Stem cell calssification
1. Based upon location
Embryonic stem cells
Somatic/ adult stem cells
2. Based upon function
Totipotent
Pluripotent
Multipotent
Unipotent
Reject Response
Traditional Immuno-repressents
Constant administration
Little engraftment after 3~4 weeks
Host immune system impaired
Vulnerable to Infection
↓Need brief immuno-re
PFCs(Perfluorinated Chemicals)
Manmade chemicals, synthetic
Resistant to heat, water, oil, grease & stains
Stable, extremely resistant to breakdown
Widely used in diverse applications
Economically useful
Electronegativity of Fluorine
Partial charges in the polarized C-F bond
C-F bond
: strongest bond in
organic chemistry
: high energy bond
Two most studied compounds