substance of large molecular weight; for example, protein, DNA, etc.

Animal magnetism.

The deliberate manipulation of the species composition of an ecosystem; such as, to try to regenerate a hypereutrophic lake after the organic pollution itself has been ameliorated.

1. A measurable indicator of a disease, or of vulnerability to a disease, that may or may not be causal. The term includes molecular, genetic, immunologic, and physiologic signals of events in biological systems that may appear in any of the various steps along the causation pathway of a disorder.
2. In toxicology, a physiological or pharmacological measure that is used to predict a toxic event in an animal.

1. The total weight of all living things in a given area, biotic community, species population, or habitat; a measure of total biotic productivity.
2. The total weight of the organic substance (as plankton) or organisms in a given area; measured as volume, mass (live, dead, dry or ash-free weight) or energy (calories); standing crop.
3. In ecology, a plant material or vegetation that can be converted to useful fuel and that is considered as a potential energy source.

1. The total weight of all living things in a given area, biotic community, species population, or habitat; a measure of total biotic productivity.
2. The total weight of the organic substance (as plankton) or organisms in a given area; measured as volume, mass (live, dead, dry or ash-free weight) or energy (calories); standing crop.
3. Material that can safely be implanted into the human body and left there without causing an adverse reaction.

1. The total complex of biotic communities occupying and characterizing a particular geographic area or zone.
2. A biotic community of plants and animals; specifically, such a community in a prehistoric period.
3. A biogeographical region or formation; a major regional ecological community characterized by distinctive life forms and principal plant (terrestrial biomes) or animal (marine biomes) species.
4. A climatically controlled group of plants and animals of a characteristic composition and distributed over a wide area, such as tropical rainforest, tundra, temperate grassland, desert, savanna, mountain habitats, taiga (a northern coniferous forest zone, especially in Siberia, adjacent to tundra), and other northern coniferous forests, etc.

1. The science concerned with the action of forces, internal or external, on the living body.
2. The study of the mechanical laws relating to the movement or structure of living organisms.
3. The study of body movements and of the forces acting on the musculoskeletal system.

1. Pertaining to those aspects of the natural sciences, especially the biologic and physiologic sciences, that relate to or underlie medicine.
2. Biological and medical, i.e., encompassing both the science(s) and the art of medicine.
3. A reference to or relating to both biology and medicine.

1. That branch of medicine dealing with functioning and survival of people in abnormal environments, especially in space.
2. Clinical medicine based on the principles of the natural sciences (biology, biochemistry, biophysics, etc.) to solve medical problems.

1. A structure bounding a cell or cell organelle; it contains lipids, proteins, glycolipids, steroids, etc.
2. Any membrane, such as a cell membrane of an organism.

1. Study of the effects of atmospheric conditions (weather) on living ortganisms.
2. That branch of ecology that deals with the effects on living organisms of the extraorganic aspects of the physical environment (such as temperature, humidity, barometric pressure, rate of air flow, and air ionization). It considers not only natural atmosphere but also artificially created atmospheres such as those to be found in buildings and shelters, and in closed ecological systems, such as satellites and submarines.

1. A device for measuring carbon dioxide given off by organisms and, hence, for determining the quantity of living matter present.
2. An instrument by which minute quantities of carbon dioxide can be measured; used in measuring the carbon dioxide given off from functioning tissue.

One who specializes in the science of biometry.