Amino Acid의 Titration과 pH buffer 작용
Amino Acid를 NaOH와 같은 염기로 Titration을 하여 얻어지는 Titration Curve는 적정하는 Amino Acid의 pH buffer 작용을 잘 설명해 준다.
즉 Amino Acid의 Carboxyl기는 Weak Acid이므로 NaOH-와 같은 Strong Base와 반응하면 일정한 pH 범위 내에서 큰 pH 변화를 일으키지 않는 pH Buffer 작용을 한다는
다. Amino Acid의 Titration과 pH buffer 작용
Amino Acid를 NaOH와 같은 염기로 Titration을 하여 얻어지는 Titration Curve는 적정하는 Amino Acid의 pH buffer 작용을 잘 설명해 준다.
즉 Amino Acid의 Carboxyl기는 Weak Acid이므로 NaOH-와 같은 Strong Base와 반응하면 일정한 pH 범위 내에서 큰 pH 변화를 일으키지 않는 pH Buffer 작용을 한
inhibiting the growth of food-spoilage micro-organisms, which covers most of the food 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 catego
top layer
A. use to thermal pressing machine for coating
Reliability of the methods
Our product processing techniques are based on exiting patent:
Fig2. ‘Anti - insect wall paper’
4. Processing
1. Functional substance(Adhesive) manufacturing
Fig3. Anti-insect adhesive manufacturing process
1) Copolymerization of vinyl acetate and Butyl acrylate
Inhibition of spoilage lactic acid bacteria(LAB) by lysozyme during wine alcoholic fermentation
LAB culture; Lactobacillus kunkeei, Lactobacillus brevis,
Pediococcus parvulus, and Pediococcus damnosus.
Lysozyme did not have any negative impact on yeast growth and sugar reduction
Very effective in inhibiting the growth of all four LAB cultures investigated
The acetic acid product
bacteria and rodents after harvesting. The use of irradiation alone as a preservation technique will not solve all the problems of post-harvest food losses, but it can play an important role in cutting losses and reducing the dependence on chemical pesticides. Many countries lose vast amounts of grain because of insect infestation and moulds. For roots and tubers, sprouting is the major cause of
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
Bacteria : somewhat smaller DNA,
takes more irradiation to kill
with D-values in the range of 0.3 to 0.7 kiloGray.
- E. coli O157 and other Shiga toxin-producing E.coli , Campylobacter jejuni, Salmonella, Listeria monocytogenes, Toxoplasma gondii, Etc.
spores : Some bacteria can form dense hardy spores,
compact and inert
◇ 생·지·화학적 순환(biogeochemical cycle)
- 물질을 이루는 원소들의 자연계 → 생물계 → 자연계에로의 이동
- 순환과정에서 원소들이 산화되거나 환원됨 → 산화-환원 순환
- 원소들이 한 곳에서 다른 곳으로 옮겨지기기도 함 →운반순환(transport cycle)
- 산화-환원 순환은 미생물의 매개로
A. 탄소의
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