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Bài viết của Lê Thị Khánh Huyền

Mechanisms of Evolution

The Hardy-Weinberg equilibrium principle says that allele frequencies in a population will remain constant in the absence of the four factors that could change them. Those factors are natural selection, mutation, genetic drift, and migration (gene flow). In ...

Tác giả: Lê Thị Khánh Huyền viết 15:24 ngày 25/05/2018 chỉnh sửa

Complexity and Chaos

Much of what impresses us about physics is related to the underlying connections and basic simplicity of the laws we have discovered. The language of physics is precise and well defined because many basic systems we study are simple enough that we can ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa

Appendicular Muscles of the Pelvic Girdle and Lower Limbs

The appendicular muscles of the lower body position and stabilize the pelvic girdle , which serves as a foundation for the lower limbs. Comparatively, there is much more movement at the pectoral girdle than at the pelvic girdle. There is very little movement ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa

Equipotential Lines

We can represent electric potentials (voltages) pictorially, just as we drew pictures to illustrate electric fields. Of course, the two are related. Consider [link], which shows an isolated positive point charge and its electric field lines. Electric field ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa

Extensions of the Laws of Inheritance

Mendel studied traits with only one mode of inheritance in pea plants. The inheritance of the traits he studied all followed the relatively simple pattern of dominant and recessive alleles for a single characteristic. There are several important modes of ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa

The Soil

Plants obtain inorganic elements from the soil, which serves as a natural medium for land plants. Soil is the outer loose layer that covers the surface of Earth. Soil quality is a major determinant, along with climate, of plant distribution and growth. Soil ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa

Applications of Atomic Excitations and De-Excitations

Many properties of matter and phenomena in nature are directly related to atomic energy levels and their associated excitations and de-excitations. The color of a rose, the output of a laser, and the transparency of air are but a few examples. (See [link].) ...

Tác giả: Lê Thị Khánh Huyền viết 15:23 ngày 25/05/2018 chỉnh sửa