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Bài viết của Trần Bảo Ngọc

Organic Compounds Essential to Human Functioning

Organic compounds typically consist of groups of carbon atoms covalently bonded to hydrogen, usually oxygen, and often other elements as well. Created by living things, they are found throughout the world, in soils and seas, commercial products, and every cell ...

Tác giả: Trần Bảo Ngọc viết 14:56 ngày 25/05/2018 chỉnh sửa

Biogeography

Many forces influence the communities of living organisms present in different parts of the biosphere (all of the parts of Earth inhabited by life). The biosphere extends into the atmosphere (several kilometers above Earth) and into the depths of the oceans. ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

The Role of Seed Plants

Without seed plants, life as we know it would not be possible. Plants play a key role in the maintenance of terrestrial ecosystems through stabilization of soils, cycling of carbon, and climate moderation. Large tropical forests release oxygen and act as carbon ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Active Transport

Active transport mechanisms require the use of the cell’s energy, usually in the form of adenosine triphosphate (ATP). If a substance must move into the cell against its concentration gradient—that is, if the concentration of the substance inside the ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Applications of Thermodynamics: Heat Pumps and Refrigerators

Almost every home contains a refrigerator. Most people don’t realize they are also sharing their homes with a heat pump. (credit: Id1337x, Wikimedia Commons) Heat pumps, air conditioners, and refrigerators utilize heat transfer ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Energy in Waves: Intensity

The destructive effect of an earthquake is palpable evidence of the energy carried in these waves. The Richter scale rating of earthquakes is related to both their amplitude and the energy they carry. (credit: Petty ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Biological Molecules

The large molecules necessary for life that are built from smaller organic molecules are called biological macromolecules . There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids), and each is an important ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Challenges Facing the Elderly

Aging comes with many challenges. The loss of independence is one potential part of the process, as are diminished physical ability and age discrimination. The term senescence refers to the aging process, including biological, emotional, ...

Tác giả: Trần Bảo Ngọc viết 14:55 ngày 25/05/2018 chỉnh sửa

Digestive System Processes

Obtaining nutrition and energy from food is a multi-step process. For true animals, the first step is ingestion, the act of taking in food. This is followed by digestion, absorption, and elimination. In the following sections, each of these steps will be ...

Tác giả: Trần Bảo Ngọc viết 14:54 ngày 25/05/2018 chỉnh sửa

Types of Societies

Maasai men are hunting with shepherd’s staves and spears. How does technology influence a society’s daily occupations? (Photo courtesy of Abir Anwar/flickr) Maasai villagers, ...

Tác giả: Trần Bảo Ngọc viết 14:54 ngày 25/05/2018 chỉnh sửa

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Organic Compounds Essential to Human Functioning

Biogeography

The Role of Seed Plants

Active Transport

Applications of Thermodynamics: Heat Pumps and Refrigerators

Energy in Waves: Intensity

Biological Molecules

Challenges Facing the Elderly

Digestive System Processes

Types of Societies

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