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Carbon

Cells are made of many complex molecules called macromolecules, such as proteins, nucleic acids (RNA and DNA), carbohydrates, and lipids. The macromolecules are a subset of organic molecules (any carbon-containing liquid, solid, or gas) that are especially ...

Tác giả: Trần Bảo Ngọc viết 15:00 ngày 25/05/2018 chỉnh sửa

Huygens's Principle: Diffraction

[link] shows how a transverse wave looks as viewed from above and from the side. A light wave can be imagined to propagate like this, although we do not actually see it wiggling through space. From above, we view the wavefronts (or wave crests) as we ...

Tác giả: Trần Bảo Ngọc viết 14:59 ngày 25/05/2018 chỉnh sửa

Nutrition and Energy Production

Given the diversity of animal life on our planet, it is not surprising that the animal diet would also vary substantially. The animal diet is the source of materials needed for building DNA and other complex molecules needed for growth, maintenance, and ...

Tác giả: Trần Bảo Ngọc viết 14:59 ngày 25/05/2018 chỉnh sửa

Flow Rate and Its Relation to Velocity

Flow rate Q size 12{Q} {} is defined to be the volume of fluid passing by some location through an area during a period of time, as seen in [link]. In symbols, this can be written as Q=Vt, size 12{Q= { {V} over {t} } } {} ...

Tác giả: Trần Bảo Ngọc viết 14:59 ngày 25/05/2018 chỉnh sửa

Introduction to the Second Law of Thermodynamics: Heat Engines and Their Efficiency

These ice floes melt during the Arctic summer. Some of them refreeze in the winter, but the second law of thermodynamics predicts that it would be extremely unlikely for the water molecules contained in these particular floes to ...

Tác giả: Trần Bảo Ngọc viết 14:59 ngày 25/05/2018 chỉnh sửa

Production of the Formed Elements

The lifespan of the formed elements is very brief. Although one type of leukocyte called memory cells can survive for years, most erythrocytes, leukocytes, and platelets normally live only a few hours to a few weeks. Thus, the body must form new blood cells and ...

Tác giả: Trần Bảo Ngọc viết 14:58 ngày 25/05/2018 chỉnh sửa

Bones of the Lower Limb

Like the upper limb, the lower limb is divided into three regions. The thigh is that portion of the lower limb located between the hip joint and knee joint. The leg is specifically the region between the knee joint and the ankle joint. Distal to the ankle ...

Tác giả: Trần Bảo Ngọc viết 14:58 ngày 25/05/2018 chỉnh sửa

Lipid Metabolism

Fats (or triglycerides) within the body are ingested as food or synthesized by adipocytes or hepatocytes from carbohydrate precursors ([link]). Lipid metabolism entails the oxidation of fatty acids to either generate energy or synthesize new lipids from smaller ...

Tác giả: Trần Bảo Ngọc viết 14:58 ngày 25/05/2018 chỉnh sửa

Control of the Cell Cycle

The length of the cell cycle is highly variable, even within the cells of a single organism. In humans, the frequency of cell turnover ranges from a few hours in early embryonic development, to an average of two to five days for epithelial cells, and to an ...

Tác giả: Trần Bảo Ngọc viết 14:58 ngày 25/05/2018 chỉnh sửa

Superphylum Ecdysozoa

The superphylum Ecdysozoa contains an incredibly large number of species. This is because it contains two of the most diverse animal groups: phylum Nematoda (the roundworms) and Phylum Arthropoda (the arthropods). The most prominant distinguising feature of ...

Tác giả: Trần Bảo Ngọc viết 14:58 ngày 25/05/2018 chỉnh sửa

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Carbon

Huygens's Principle: Diffraction

Nutrition and Energy Production

Flow Rate and Its Relation to Velocity

Introduction to the Second Law of Thermodynamics: Heat Engines and Their Efficiency

Production of the Formed Elements

Bones of the Lower Limb

Lipid Metabolism

Control of the Cell Cycle

Superphylum Ecdysozoa

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