Biology

Double circulation To Ehrlich, Paul (Biology)

Double circulation A transportation system for the blood that has separate pulmonary and systemic systems. The heart pumps blood to the lungs and back, then to the body and back via a network of blood vessels. In humans (but not all animals) the blood travels through the heart twice on each complete journey around the […]

Eijkman, Christiaan To Endergonic reaction (Biology)

Eijkman, Christiaan (1858-1930) Dutch Physician Christiaan Eijkman was born on August 11, 1858, at Nijkerk in Gelderland (The Netherlands) to Christiaan Eijkman, the headmaster of a local school, and Johanna Alida Pool. He received his education at his father’s school in Zaandam. In 1875 he entered the Military Medical School of the University of Amsterdam […]

Enders, John Franklin To Epoch (Biology)

Enders, John Franklin (1897-1985) American Virologist John Franklin Enders was born on February 10, 1897, at West Hartford, Connecticut, to John Ostrom Enders, a banker in Hartford, and Harriet Goulden Enders (nee Whitmore). He was educated at the Noah Webster School at Hartford and St. Paul’s School in Concord, New Hampshire. In 1915 he went […]

Equator To Fahrenheit, Daniel Gabriel (Biology)

Equator The area around the earth with a latitude of 0° that divides the Northern and Southern Hemispheres. It lies equidistant from the poles. Era A period or date of time used in geological time tables to locate historical events. Usually refers to longer periods of time and marks a new or distinctive period. See […]

Family To Flagellum (Biology)

Family The taxonomic category between order and tribe, but if no tribe exists, then it is the category between order and genus. Also a social unit related by marriage, descent, or kinship. Farsightedness A condition in eyesight where distant objects can be seen better than objects that are closer. It is the inability of images […]

Flanking region To Galton, Sir Francis (Biology)

Flanking region The DNA sequences extending on either side of a specific gene or locus; a region preceding or following the transcribed region. The 3′ flanking region (downstream flanking region) is found immediately distal (distant) to the part of a gene that specifies the mRNA and where a variety of regulatory sequences are located. The […]

Gametangium To Geographic range (Biology)

Gametangium A reproductive organ that produces gametes (reproductive cells); nuclei that fuse and produce sexual spores in algae, fungi, mosses, and ferns. Gamete A haploid (half the number of chromosomes) sex cell, either male (sperm) or female (egg), that fuses with another sex cell during the process of fertilization. Gametophyte For plants with alternation of […]

Geological time To Gland (Biology)

Geological time The span of time that has passed since the creation of the Earth and its components; a scale used to measure geological events millions of years ago. Measured in chronostratic or relative terms, where subdivisions of the Earth’s geology are set in an order based on (a) relative age relationships based on fossil […]

Glaucoma To Ground meristem (Biology)

Glaucoma A disease of the eye characterized by loss of vision due to an increase in the pressure of fluid within the eye (intraocular pressure) that leads to damage to the optic nerve and loss of vision in both eyes. Can eventually lead to blindness. The disease affects about 6 million people worldwide. In the […]

Ground tissue system To Helium (Biology)

Ground tissue system The plant tissue system that forms most of the photosynthetic tissue in leaves, composed mostly of parenchyma cells and some collenchy-ma (elongate and thick walled in strands) and sclerenchyma (thick, rigid, secondary walls with lignin to provide support) cells. It is found between the epidermis and surrounding the vascular tissue system. Acts […]

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