The temporal sequence of events that have occurred.
Techniques used to determine the age of materials, based on the content and half-lives of the RADIOACTIVE ISOTOPES they contain.
The scientific study of past societies through artifacts, fossils, etc.
The distinctly human attributes and attainments of a particular society.
A plant genus of the family CUPRESSACEAE. The species are slow growing coniferous evergreen trees or shrubs.
The period of history before 500 of the common era.
The ash, dust, gases, and lava released by volcanic explosion. The gases are volatile matter composed principally of about 90% water vapor, and carbon dioxide, sulfur dioxide, hydrogen, carbon monoxide, and nitrogen. The ash or dust is pyroclastic ejecta and lava is molten extrusive material consisting mainly of magnesium silicate. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Remains, impressions, or traces of animals or plants of past geological times which have been preserved in the earth's crust.
Family of the suborder HAPLORHINI (Anthropoidea) comprising bipedal primate MAMMALS. It includes modern man (HOMO SAPIENS) and the great apes: gorillas (GORILLA GORILLA), chimpanzees (PAN PANISCUS and PAN TROGLODYTES), and orangutans (PONGO PYGMAEUS).
The longterm manifestations of WEATHER. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
A product of hard secondary xylem composed of CELLULOSE, hemicellulose, and LIGNANS, that is under the bark of trees and shrubs. It is used in construction and as a source of CHARCOAL and many other products.
The study of early forms of life through fossil remains.
Time period from 1801 through 1900 of the common era.
Time period from 1901 through 2000 of the common era.
Woody, usually tall, perennial higher plants (Angiosperms, Gymnosperms, and some Pterophyta) having usually a main stem and numerous branches.
The science dealing with the earth and its life, especially the description of land, sea, and air and the distribution of plant and animal life, including humanity and human industries with reference to the mutual relations of these elements. (From Webster, 3d ed)
Elements of limited time intervals, contributing to particular results or situations.
A theorem in probability theory named for Thomas Bayes (1702-1761). In epidemiology, it is used to obtain the probability of disease in a group of people with some characteristic on the basis of the overall rate of that disease and of the likelihood of that characteristic in healthy and diseased individuals. The most familiar application is in clinical decision analysis where it is used for estimating the probability of a particular diagnosis given the appearance of some symptoms or test result.
The process of cumulative change at the level of DNA; RNA; and PROTEINS, over successive generations.
The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.
The relationships of groups of organisms as reflected by their genetic makeup.
Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.
A publication issued at stated, more or less regular, intervals.
Books used in the study of a subject that contain a systematic presentation of the principles and vocabulary of a subject.
Use of computers or computer systems for doing routine clerical work, e.g., billing, records pertaining to the administration of the office, etc.
A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.
Sensory cells in the ampullary crest of each of the semicircular ducts, with their apical STEREOCILIA embedded in a wedge-shaped gelatinous cupula. These hair cells sense the movement of ENDOLYMPH resulting from angular acceleration of the head, and send signals via the VESTIBULAR NERVE to the brain to maintain balance.
Water particles that fall from the ATMOSPHERE.
The presence of bacteria, viruses, and fungi in the air. This term is not restricted to pathogenic organisms.
Social effort most active in the 19th and early 20th centuries dedicated to promoting moderation or complete abstinence in the use of ALCOHOLIC BEVERAGES.
Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)
Official records of individual deaths including the cause of death certified by a physician, and any other required identifying information.
The act of killing oneself.
A traditional grouping of drugs said to have a soothing or calming effect on mood, thought, or behavior. Included here are the ANTI-ANXIETY AGENTS (minor tranquilizers), ANTIMANIC AGENTS, and the ANTIPSYCHOTIC AGENTS (major tranquilizers). These drugs act by different mechanisms and are used for different therapeutic purposes.
The unsuccessful attempt to kill oneself.
Chemical reactions or functions, enzymatic activities, and metabolic pathways of living things.
Works listing and describing various sources of information, from multiple media or in different formats, on a given subject.
An intermittent fever characterized by intervals of chills, fever, and splenomegaly each of which may last as long as 40 hours. It is caused by BARTONELLA QUINTANA and transmitted by the human louse.
Activities concerned with governmental policies, functions, etc.
A worm-like blind tube extension from the CECUM.
The practice of medicine concerned with conditions affecting the health of individuals associated with the marine environment.
Persons including soldiers involved with the armed forces.
A form of violent crowd behavior which expresses the emotional release of resentments and prejudices, usually relevant to grievances toward the social system.
A country in northern Africa, bordering the Mediterranean Sea, between Libya and the Gaza Strip, and the Red Sea north of Sudan, and includes the Asian Sinai Peninsula Its capital is Cairo.
Innovation and improvement of the health care system by reappraisal, amendment of services, and removal of faults and abuses in providing and distributing health services to patients. It includes a re-alignment of health services and health insurance to maximum demographic elements (the unemployed, indigent, uninsured, elderly, inner cities, rural areas) with reference to coverage, hospitalization, pricing and cost containment, insurers' and employers' costs, pre-existing medical conditions, prescribed drugs, equipment, and services.
A totalitarian system of government in which a single authoritarian party controls state-owned means of production with the professed aim of establishing a classless society.
Control of drug and narcotic use by international agreement, or by institutional systems for handling prescribed drugs. This includes regulations concerned with the manufacturing, dispensing, approval (DRUG APPROVAL), and marketing of drugs.