enlace covalente

A covalent bond in which atoms share electrons in an unequal fashion. The resulting molecule has regions with positive and negative charges. The presence of polar covalent bonds ...

núcleo del átomo

Biologie; Biologie celulară

An atom's core; contains protons and one or more neutrons (except hydrogen, which has no neutrons).

número atómico

Biologie; Biologie celulară

The number of protons in the nucleus of an atom.

asma

Biologie; Biologie celulară

A respiratory disorder caused by allergies that constrict the bronchioles by inducing spasms in the muscles surrounding the lungs, by causing the bronchioles to swell, or by ...

ascomicetos

Biologie; Biologie celulară

Division of fungi that contains the yeasts and morels; ascomycetes produce an ascus (or sac) in which ascospores are produced.

selección artificial

Biologie; Biologie celulară

The process in which breeders choose the variants to be used to produce succeeding generations.

reproducción asexual

Biologie; Biologie celulară

A method of reproduction in which genetically identical offspring are produced from a single parent; occurs by many mechanisms, including fission, budding, and fragmentation.

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Francisca Bittner

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Industrie/Domeniu: Aerospaţial Categorie: Zbor spaţial

transbordador espacial

Nave espacial reutilizable con alas desarrollado por la Administración Nacional de Aeronáutica y del Espacio de Estados Unidos (NASA) para misiones de ...