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Bài viết của Trần Bảo Ngọc

Behavioral Biology: Proximate and Ultimate Causes of Behavior

Behavior is the change in activity of an organism in response to a stimulus. Behavioral biology is the study of the biological and evolutionary bases for such changes. The idea that behaviors evolved as a result of the pressures of natural selection is not ...

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

Introduction to Marriage and Family

With so many unmarried couples living together and having children, is marriage becoming obsolete? (Photo courtesy of Nina Matthews/flickr) Christina and James met in college and have been dating for more than five years. For the past ...

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

The Simple Pendulum

A simple pendulum has a small-diameter bob and a string that has a very small mass but is strong enough not to stretch appreciably. The linear displacement from equilibrium is s size 12{s} {}, the length of the arc. Also shown ...

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

Eukaryotic Cells

At this point, it should be clear that eukaryotic cells have a more complex structure than do prokaryotic cells. Organelles allow for various functions to occur in the cell at the same time. Before discussing the functions of organelles within a eukaryotic ...

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

X Rays: Atomic Origins and Applications

Each type of atom (or element) has its own characteristic electromagnetic spectrum. X rays lie at the high-frequency end of an atom’s spectrum and are characteristic of the atom as well. In this section, we explore characteristic x rays and some of ...

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

Forces and Torques in Muscles and Joints

Muscles, bones, and joints are some of the most interesting applications of statics. There are some surprises. Muscles, for example, exert far greater forces than we might think. [link] shows a forearm holding a book and a schematic diagram of an analogous ...

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

Layers of the Skin

Although you may not typically think of the skin as an organ, it is in fact made of tissues that work together as a single structure to perform unique and critical functions. The skin and its accessory structures make up the integumentary system , which ...

Tác giả: Trần Bảo Ngọc viết 15:14 ngày 25/05/2018 chỉnh sửa

Angiosperms

From their humble and still obscure beginning during the early Jurassic period, the angiosperms—or flowering plants—have evolved to dominate most terrestrial ecosystems ([link]). With more than 250,000 species, the angiosperm phylum (Anthophyta) is second only ...

Tác giả: Trần Bảo Ngọc viết 15:14 ngày 25/05/2018 chỉnh sửa

Protein Metabolism

Much of the body is made of protein, and these proteins take on a myriad of forms. They represent cell signaling receptors, signaling molecules, structural members, enzymes, intracellular trafficking components, extracellular matrix scaffolds, ion pumps, ion ...

Tác giả: Trần Bảo Ngọc viết 15:14 ngày 25/05/2018 chỉnh sửa

Relativistic Addition of Velocities

The total velocity of a kayak, like this one on the Deerfield River in Massachusetts, is its velocity relative to the water as well as the water’s velocity relative to the riverbank. (credit: abkfenris, Flickr) If you’ve ever ...

Tác giả: Trần Bảo Ngọc viết 15:14 ngày 25/05/2018 chỉnh sửa

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Behavioral Biology: Proximate and Ultimate Causes of Behavior

Introduction to Marriage and Family

The Simple Pendulum

Eukaryotic Cells

X Rays: Atomic Origins and Applications

Forces and Torques in Muscles and Joints

Layers of the Skin

Angiosperms

Protein Metabolism

Relativistic Addition of Velocities

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