지질학자들 영구에 의하면 지구가 탄생을 약 50-60억년 전으로 추정하고 있다. 지구 탄생이후 약 38억년에 원시적 식물과 동물이 지구에 나타났으며 그 후 수많은 식물과 동물이 탄생했다가 영원히 사라졌다. 적자생존의 원칙은 동물의 세계뿐만 아니라 식물의 세계에도 적용되며 곤충과 질병으로부터
Abstract
Bioethanol is one of the alternative sources of oil resources which received attention with biodiesel. Many countries produce bioethanol from food sources such as corn and sugarcane, but it causes food-energy conflicts and farmland problem. So it needs to focus on new biomass which is sustainable, renewable, cost-effective and do not occurred any conflicts. Algae are one of the bioma
Experiment Condition
95% N2: 5% H2 gas mix 99.995% using pure gases
Equipped with a Pd catalyst at 20~25oC
Solutions were purged with O2-free N2
and stored in the chamber for least 5 days.
0.25M Fe(Ⅱ) and other samples were prepared inside the chamber and using material for at least 5 days .
Stock Fe(Ⅱ) solutions were stored at pH<1.0 in amber containers wrapped with aluminum foil
1. Uptake Hydrogenase
1) Definition of Uptake Hydrogenase and Mechanism of Hydrogen Production
Uptake hydrogenases are Ni-Fe enzymes that catalyze the conversion of hydrogen gas to hydrogen ions and electrons. They are found in the heterocysts and not in the vegetative cells of nitrogen-fixing strains of cyanobacteria. They remove the hydrogen gas produced by nitrogenase when they carry o
1. Introduction
1) Definition of preservation and food-spoilage micro-organisms
Food preservation is the process of treating and handling food to stop or greatly slow down spoilage (loss of quality, edibility or nutritive value) caused or accelerated by micro-organisms. Some methods, however, use benign bacteria, yeasts or fungi to add specific qualities and to preserve food (e.g., cheese, wine