Login processing...

Trial ends in Request Full Access Tell Your Colleague About Jove
第27章
什么是生态系统?
An ecosystem is the interaction between all abiotic and biotic factors in an environment and can be classified as terrestrial or aquatic.…
营养级别
All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food…
初级生产
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers…
生产效率
Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic…
营养效率
Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss…
什么是生物地球化学循环?
The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in…
水循环
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living…
碳循环
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged…
氮循环
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of…
磷循环
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as…
硫循环
Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found…
生物修复
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful…
从冷冻芯的外层部分外源物质的去除探讨古代生物群落里面窝藏
The cryosphere offers access to preserved organisms that persisted under past environmental conditions. In fact, these frozen materials could reflect…
一个工具包,使水环境中的烃类转化
This work puts forward a toolkit that enables the conversion of alkanes by Escherichia coli and presents a proof of principle of its applicability.…

Get cutting-edge science videos from JoVE sent straight to your inbox every month.

Waiting X
simple hit counter