Encyclopedia of Biology

144 geological time 132 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 X Y Cytogenetic map showing the visual appearance of ...

geosynclines A large, down-warped, generally linear basin or trough found in the Earth’s crust where large amounts of sediment a ...

germination Sprouting of a seed; the first stages in the growth of a seed from a seedling to an adult. After germination the emb ...

into the blood stream, while exocrine use a duct or net- work into the body. Glands important to the human body are the hypothal ...

called the glial growth factor, induces the growth of glial cells. A type of brain tumor that forms in the glial tissue is calle ...

from carbohydrates but from fats and protein as well. Glucose is known as a dextrorotatory sugar (a chiral molecule that rotates ...

glycoprotein (conjugated protein) Glycoproteins are complexes in which carbohydrates are attached cova- lently to asparagine (N- ...

located in the cytoplasm of the cell, for various parts of the cell. Named after the Nobel Prize recipient, Italian neurologist ...

located in the inner membrane of chloroplasts—where photosynthesis takes place. They appear as green gran- ules under a microsco ...

are polypeptides similar to insulin); somatomedins, polypeptides made by the liver and fibroblasts that, when released into the ...

gymnosperm A group of flowerless plants that includes pines, conifers, redwoods, firs, yews, and cycads. Gymnospermmeans “naked ...

Haber-Weiss reaction The Haber-Weiss cycle con- sists of the following two reactions: H 2 O 2 + OH.ÔH 2 O + O 2 – + H+and H 2 O ...

global parameters representing hydrophobic, electron- ic, steric, and other effects using multiple regression correlation method ...

is ahyphal tip that penetrates the host but not the cell membrane. Haversian system(osteon) A structural composition of compact ...

158 hectare Insects and Man—An Exotic Dilemma ByTimothy L. McCabe, Ph.D. Insects have long been recognized for their benefits as ...

helium An inert gas; an element with atomic number 2. Helium is produced in stars and is the second most abundant element in the ...

(e.g., Saccoglossus), which burrow in sand and mud, and pterobranchs (e.g., Rhabdopleura), tiny colonial animals. The hemichorda ...

adrenal gland. He shared with Edward C. Kendall and Tadeus REICHSTEINthe 1950 Nobel Prize in physiolo- gyor medicine for this pi ...

heterochrony An evolutionary change in develop- mental timing in the relative time or rate of appearance ordevelopment of a char ...

genetic variation; condition in which heterozygotes have higher fitness than homozygotes. heterozygous Two different alleles of ...