Life Sciences Glossary: From Earthshine to Endoplasmic Reticulum

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Earthshine

It is a light which has travelled from the sun to the Earth, then to the Moon and back again to the Earth.

Elasticity

The property of the body which tends to restore its originals dimensions when the deforming forces are withdrawn, is called elasticity.

Exosphere

Is the outermost region of the atmosphere where gas molecules travelling at high speed may escape into outer space?

Electrolysis

The process of splitting up of an electrolyte or an acid solution by the passage of an electric current.

Element

Pure substance consisting of the particular atomic number which cannot be further decomposed by ordinary chemical means. There are 105 elements in the periodic Table.

Environmental Pollution

Rapid industriallsation and consumption of mineral and other natural resources during the past few decades have either increased the levels of harmful substances or introduced a large number of harmful substances into the environment (air, soil, water) which has become so polluted in certain areas that healthy development of life is hindered.

Exophthalmia

A disease with the condition of dry and lustreless cornea and conjunctive areas, usually the result of vitamin A deficiency.

Ecdysis

Melting, the periodic shedding of the cuticle of an arthropod or the outer epidermal layer of a reptile.

Eco Tone

The transition zone between two adjacent communities.

Ectoderm

The outer germ layer giving rise to tissues that include skin and nervous system.

Ectothermic

Having a variable body temperature; derives heat from the environment.

Eczema

A skin rash characterized by itching, swelling, blistering, oozing and scaling of the skin.

Edema

The abnormal accumulation of fluid in interstitial spaces of tissues such as in the pericardial sac, intrapleural space, peritoneal cavity or joint capsules.

Effector

An organ, tissue or cell that becomes active in response to stimulation.

Efferent

Directed away from as center, such as certain arteries, veins, nerves and lymphatic՚s.

Ejaculation

The sudden emission of semen from the male urethra.

Electron Carriers

Intermediates such as flavor- proteins and cytochromes that reversibly gain or lose electrons.

Eleidin

A translucent substance found in the skin.

Embryo

The early developmental stage of an organism produced from a fertilized egg.

Emmetropia

A state of normal vision characterized by the proper relationship between refractive system of eyeball and its axial length.

Emphysema

A swelling or inflation of air passages with resulting stagnation of air in parts of the lungs; loss of elasticity in the alveoli.

Emulsion

A colloidal system in which both phases are liquids.

Enamel

The hard-outer layer of tooth.

Endemic

Peculiar to a certain region or country, native to a restricted area.

Endemic Goiter

An enlargement of the thyroid gland caused by the dietary intake of inadequate amounts of iodine.

Endocrine

Refers to gland that is without a duct and that releases hormones directly into blood.

Endocytosis

Intake by a cell of solutes or particles by enclosing them in an unfolding of the plasma membrane.

Endoderm

The inner germ layer; gives rise to internal organs.

End Lymph

Fluid found in the membranous labyrinth of the vertebrate ear.

Endometrium

The mucous membranous lining of mammalian uterus.

End Mitosis

Duplication of chromosomes without division of the nucleus.

Endonuclease

An enzyme that breaks strands of DNA at internal positions.

Endoplasmic Reticulum

Network of membranes in the cytoplasm to which ribosomes adhere.

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