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Simple Harmonic Motion: A Special Periodic Motion

The oscillations of a system in which the net force can be described by Hooke’s law are of special importance, because they are very common. They are also the simplest oscillatory systems. Simple Harmonic Motion (SHM) is the name given to ...

Tác giả: Trần Bảo Ngọc viết 15:24 ngày 25/05/2018 chỉnh sửa

Transcription

In both prokaryotes and eukaryotes, the second function of DNA (the first was replication) is to provide the information needed to construct the proteins necessary so that the cell can perform all of its functions. To do this, the DNA is “read” or ...

Tác giả: Trần Bảo Ngọc viết 15:24 ngày 25/05/2018 chỉnh sửa

Development of the Heart

The human heart is the first functional organ to develop. It begins beating and pumping blood around day 21 or 22, a mere three weeks after fertilization. This emphasizes the critical nature of the heart in distributing blood through the vessels and the vital ...

Tác giả: Trần Bảo Ngọc viết 15:24 ngày 25/05/2018 chỉnh sửa

Enzymes

A substance that helps a chemical reaction to occur is a catalyst, and the special molecules that catalyze biochemical reactions are called enzymes. Almost all enzymes are proteins, made up of chains of amino acids, and they perform the critical task of ...

Tác giả: Trần Bảo Ngọc viết 15:24 ngày 25/05/2018 chỉnh sửa

Chemical Reactions

One characteristic of a living organism is metabolism, which is the sum total of all of the chemical reactions that go on to maintain that organism’s health and life. The bonding processes you have learned thus far are anabolic chemical reactions; that ...

Tác giả: Trần Bảo Ngọc viết 15:23 ngày 25/05/2018 chỉnh sửa

Central Control

The pupillary light reflex ([link]) begins when light hits the retina and causes a signal to travel along the optic nerve. This is visual sensation, because the afferent branch of this reflex is simply sharing the special sense pathway. Bright light hitting the ...

Tác giả: Trần Bảo Ngọc viết 15:23 ngày 25/05/2018 chỉnh sửa

Sound Interference and Resonance: Standing Waves in Air Columns

Some types of headphones use the phenomena of constructive and destructive interference to cancel out outside noises. (credit: JVC America, Flickr) Interference is the hallmark of waves, all of which exhibit constructive and ...

Tác giả: Trần Bảo Ngọc viết 15:23 ngày 25/05/2018 chỉnh sửa

Molecular Transport Phenomena: Diffusion, Osmosis, and Related Processes

There is something fishy about the ice cube from your freezer—how did it pick up those food odors? How does soaking a sprained ankle in Epsom salt reduce swelling? The answer to these questions are related to atomic and molecular transport phenomena—another ...

Tác giả: Trần Bảo Ngọc viết 15:22 ngày 25/05/2018 chỉnh sửa

Politics in the United States

Americans’ right to vote in free elections is a fundamental element of the nation’s democratic structure and a privilege envied by citizens of more oppressive societies. (Photo ...

Tác giả: Trần Bảo Ngọc viết 15:22 ngày 25/05/2018 chỉnh sửa

Introduction to Fluid Statics

The fluid essential to all life has a beauty of its own. It also helps support the weight of this swimmer. (credit: Terren, Wikimedia Commons) Much of what we value in life is fluid: a breath of fresh winter air; ...

Tác giả: Trần Bảo Ngọc viết 15:22 ngày 25/05/2018 chỉnh sửa

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Simple Harmonic Motion: A Special Periodic Motion

Transcription

Development of the Heart

Enzymes

Chemical Reactions

Central Control

Sound Interference and Resonance: Standing Waves in Air Columns

Molecular Transport Phenomena: Diffusion, Osmosis, and Related Processes

Politics in the United States

Introduction to Fluid Statics

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