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1419 | https://en.wikipedia.org/wiki/Adiabatic%20process | Adiabatic process | An adiabatic process (adiabatic ) is a type of thermodynamic process that occurs without transferring heat between the thermodynamic system and its environment. Unlike an isothermal process, an adiabatic process transfers energy to the surroundings only as work and/or mass flow. As a key concept in thermodynamics, the ... | Physical sciences | Thermodynamics | Physics |
1422 | https://en.wikipedia.org/wiki/Amide | Amide | In organic chemistry, an amide, also known as an organic amide or a carboxamide, is a compound with the general formula , where R, R', and R″ represent any group, typically organyl groups or hydrogen atoms. The amide group is called a peptide bond when it is part of the main chain of a protein, and an isopeptide bond w... | Physical sciences | Carbon–nitrogen bond | null |
1453 | https://en.wikipedia.org/wiki/ALGOL | ALGOL | ALGOL (; short for "Algorithmic Language") is a family of imperative computer programming languages originally developed in 1958. ALGOL heavily influenced many other languages and was the standard method for algorithm description used by the Association for Computing Machinery (ACM) in textbooks and academic sources fo... | Technology | "Historical" languages | null |
1461 | https://en.wikipedia.org/wiki/Apollo%20program | Apollo program | The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which succeeded in landing the first men on the Moon in 1969, following Project Mercury, which put the first Americans in space. It was conceived in 1960 as a three-person spacecraft during President Dwight D.... | Technology | Programs and launch sites | null |
1525 | https://en.wikipedia.org/wiki/Aspirin | Aspirin | Aspirin is the genericized trademark for acetylsalicylic acid (ASA), a nonsteroidal anti-inflammatory drug (NSAID) used to reduce pain, fever, and inflammation, and as an antithrombotic. Specific inflammatory conditions that aspirin is used to treat include Kawasaki disease, pericarditis, and rheumatic fever.
Aspirin ... | Biology and health sciences | Drugs and pharmacology | null |
1537 | https://en.wikipedia.org/wiki/Acupuncture | Acupuncture | Acupuncture is a form of alternative medicine and a component of traditional Chinese medicine (TCM) in which thin needles are inserted into the body. Acupuncture is a pseudoscience; the theories and practices of TCM are not based on scientific knowledge, and it has been characterized as quackery.
There is a range of a... | Biology and health sciences | Alternative and traditional medicine | null |
1542 | https://en.wikipedia.org/wiki/Amaranth | Amaranth | Amaranthus is a cosmopolitan group of more than 50 species which make up the genus of annual or short-lived perennial plants collectively known as amaranths. Some of the better known names include "prostrate pigweed" and "love lies bleeding". Some amaranth species are cultivated as leaf vegetables, pseudocereals, and o... | Biology and health sciences | Caryophyllales | null |
1634 | https://en.wikipedia.org/wiki/Aquaculture | Aquaculture | Aquaculture (less commonly spelled aquiculture), also known as aquafarming, is the controlled cultivation ("farming") of aquatic organisms such as fish, crustaceans, mollusks, algae and other organisms of value such as aquatic plants (e.g. lotus). Aquaculture involves cultivating freshwater, brackish water, and saltwat... | Technology | Forms | null |
1635 | https://en.wikipedia.org/wiki/Kolmogorov%20complexity | Kolmogorov complexity | In algorithmic information theory (a subfield of computer science and mathematics), the Kolmogorov complexity of an object, such as a piece of text, is the length of a shortest computer program (in a predetermined programming language) that produces the object as output. It is a measure of the computational resources n... | Mathematics | Complexity theory | null |
1650 | https://en.wikipedia.org/wiki/Aloe | Aloe | Aloe (; also written Aloë) is a genus containing over 650 species of flowering succulent plants. The most widely known species is Aloe vera, or "true aloe". It is called this because it is cultivated as the standard source for assorted pharmaceutical purposes. Other species, such as Aloe ferox, are also cultivated or ... | Biology and health sciences | Monocots | null |
1680 | https://en.wikipedia.org/wiki/Amaryllis | Amaryllis | Amaryllis () is the only genus in the subtribe Amaryllidinae (tribe Amaryllideae). It is a small genus of flowering bulbs, with two species. The better known of the two, Amaryllis belladonna, is a native of the Western Cape region of South Africa, particularly the rocky southwest area between the Olifants River Valley ... | Biology and health sciences | Monocots | null |
1776 | https://en.wikipedia.org/wiki/Arthritis | Arthritis | Arthritis is a general medical term used to describe a disorder that affects joints. Symptoms generally include joint pain and stiffness. Other symptoms may include redness, warmth, swelling, and decreased range of motion of the affected joints. In certain types of arthritis, other organs such as the skin are also affe... | Biology and health sciences | Non-infectious disease | null |
1778 | https://en.wikipedia.org/wiki/Acetylene | Acetylene | Acetylene (systematic name: ethyne) is the chemical compound with the formula and structure . It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, bu... | Physical sciences | Aliphatic hydrocarbons | Chemistry |
1786 | https://en.wikipedia.org/wiki/Arabic%20numerals | Arabic numerals | The ten Arabic numerals (0, 1, 2, 3, 4, 5, 6, 7, 8, and 9) are the most commonly used symbols for writing numbers. The term often also implies a positional notation number with a decimal base, in particular when contrasted with Roman numerals. However the symbols are also used to write numbers in other bases, such as o... | Mathematics | Language | null |
1797 | https://en.wikipedia.org/wiki/Acre | Acre | The acre ( ) is a unit of land area used in the British imperial and the United States customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 10 square chains, of a square mile, 4,840 square yards, or 43,560 square feet, and approximately 4,04... | Physical sciences | Area | null |
1800 | https://en.wikipedia.org/wiki/Adenosine%20triphosphate | Adenosine triphosphate | Adenosine triphosphate (ATP) is a nucleoside triphosphate that provides energy to drive and support many processes in living cells, such as muscle contraction, nerve impulse propagation, and chemical synthesis. Found in all known forms of life, it is often referred to as the "molecular unit of currency" for intracellul... | Biology and health sciences | Biochemistry and molecular biology | null |
1805 | https://en.wikipedia.org/wiki/Antibiotic | Antibiotic | An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting bacterial infections, and antibiotic medications are widely used in the treatment and prevention of such infections. They may either kill or inhibit the growth of bacteria. A lim... | Biology and health sciences | Drugs and medication | null |
1839 | https://en.wikipedia.org/wiki/Allotropy | Allotropy | Allotropy or allotropism () is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements. Allotropes are different structural modifications of an element: the atoms of the element are bonded together in different manners.
For example,... | Physical sciences | Basics_4 | null |
1845 | https://en.wikipedia.org/wiki/Alternative%20medicine | Alternative medicine | Alternative medicine is any practice that aims to achieve the healing effects of medicine despite lacking biological plausibility, testability, repeatability or evidence of effectiveness. Unlike modern medicine, which employs the scientific method to test plausible therapies by way of responsible and ethical clinical t... | Biology and health sciences | Alternative and traditional medicine | null |
1911 | https://en.wikipedia.org/wiki/Allele | Allele | An allele (or allelomorph) is a variant of the sequence of nucleotides at a particular location, or locus, on a DNA molecule.
Alleles can differ at a single position through single nucleotide polymorphisms (SNP), but they can also have insertions and deletions of up to several thousand base pairs.
Most alleles observ... | Biology and health sciences | Genetics | Biology |
1912 | https://en.wikipedia.org/wiki/Ampicillin | Ampicillin | Ampicillin is an antibiotic belonging to the aminopenicillin class of the penicillin family. The drug is used to prevent and treat several bacterial infections, such as respiratory tract infections, urinary tract infections, meningitis, salmonellosis, and endocarditis. It may also be used to prevent group B streptococc... | Biology and health sciences | Antibiotics | Health |
1914 | https://en.wikipedia.org/wiki/Antimicrobial%20resistance | Antimicrobial resistance | Antimicrobial resistance (AMR or AR) occurs when microbes evolve mechanisms that protect them from antimicrobials, which are drugs used to treat infections. This resistance affects all classes of microbes, including bacteria (antibiotic resistance), viruses (antiviral resistance), protozoa (antiprotozoal resistance), a... | Biology and health sciences | Anti-infectives | Health |
1915 | https://en.wikipedia.org/wiki/Antigen | Antigen | In immunology, an antigen (Ag) is a molecule, moiety, foreign particulate matter, or an allergen, such as pollen, that can bind to a specific antibody or T-cell receptor. The presence of antigens in the body may trigger an immune response.
Antigens can be proteins, peptides (amino acid chains), polysaccharides (chain... | Biology and health sciences | Immune system | Biology |
1924 | https://en.wikipedia.org/wiki/Argo%20Navis | Argo Navis | Argo Navis (the Ship Argo), or simply Argo, is one of Ptolemy's 48 constellations, now a grouping of three IAU constellations. It is formerly a single large constellation in the southern sky. The genitive is "Argus Navis", abbreviated "Arg". John Flamsteed and other early modern astronomers called it Navis (the Ship), ... | Physical sciences | Asterism | Astronomy |
1926 | https://en.wikipedia.org/wiki/Antlia | Antlia | Antlia (; from Ancient Greek ἀντλία) is a constellation in the Southern Celestial Hemisphere. Its name means "pump" in Latin and Greek; it represents an air pump. Originally Antlia Pneumatica, the constellation was established by Nicolas-Louis de Lacaille in the 18th century. Its non-specific (single-word) name, alread... | Physical sciences | Other | Astronomy |
1927 | https://en.wikipedia.org/wiki/Ara%20%28constellation%29 | Ara (constellation) | Ara (Latin for "the Altar") is a southern constellation between Scorpius, Telescopium, Triangulum Australe, and Norma. It was (as ) one of the Greek bulk (namely 48) described by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations designated by the International Astronomical Union.
T... | Physical sciences | Other | Astronomy |
1933 | https://en.wikipedia.org/wiki/Apus | Apus | Apus is a small constellation in the southern sky. It represents a bird-of-paradise, and its name means "without feet" in Greek because the bird-of-paradise was once wrongly believed to lack feet. First depicted on a celestial globe by Petrus Plancius in 1598, it was charted on a star atlas by Johann Bayer in his 1603 ... | Physical sciences | Other | Astronomy |
1941 | https://en.wikipedia.org/wiki/Aeon | Aeon | The word aeon , also spelled eon (in American and Australian English), originally meant "life", "vital force" or "being", "generation" or "a period of time", though it tended to be translated as "age" in the sense of "ages", "forever", "timeless" or "for eternity". It is a Latin transliteration from the ancient Greek ... | Physical sciences | Time | Basics and measurement |
1942 | https://en.wikipedia.org/wiki/Airline | Airline | An airline is a company that provides air transport services for traveling passengers or freight (cargo). Airlines use aircraft to supply these services and may form partnerships or alliances with other airlines for codeshare agreements, in which they both offer and operate the same flight. Generally, airline companies... | Technology | Aviation | null |
1962 | https://en.wikipedia.org/wiki/Apparent%20magnitude | Apparent magnitude | Apparent magnitude () is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer.
Unless st... | Physical sciences | Basics | Astronomy |
1963 | https://en.wikipedia.org/wiki/Absolute%20magnitude | Absolute magnitude | In astronomy, absolute magnitude () is a measure of the luminosity of a celestial object on an inverse logarithmic astronomical magnitude scale; the more luminous (intrinsically bright) an object, the lower its magnitude number. An object's absolute magnitude is defined to be equal to the apparent magnitude that the ob... | Physical sciences | Basics | Astronomy |
1979 | https://en.wikipedia.org/wiki/Alpha%20Centauri | Alpha Centauri | Alpha Centauri (, α Cen, or Alpha Cen) is a triple star system in the southern constellation of Centaurus. It consists of three stars: Rigil Kentaurus (), Toliman (), and Proxima Centauri (). Proxima Centauri is the closest star to the Sun at 4.2465 light-years (1.3020 pc).
and B are Sun-like stars (class G and K, re... | Physical sciences | Notable stars | null |
1980 | https://en.wikipedia.org/wiki/Amiga | Amiga | Amiga is a family of personal computers produced by Commodore from 1985 until the company's bankruptcy in 1994, with production by others afterward. The original model is one of a number of mid-1980s computers with 16-bit or 16/32-bit processors, 256 KB or more of RAM, mouse-based GUIs, and significantly improved graph... | Technology | Specific hardware | null |
1997 | https://en.wikipedia.org/wiki/Algebraic%20geometry | Algebraic geometry | Algebraic geometry is a branch of mathematics which uses abstract algebraic techniques, mainly from commutative algebra, to solve geometrical problems. Classically, it studies zeros of multivariate polynomials; the modern approach generalizes this in a few different aspects.
The fundamental objects of study in algebra... | Mathematics | Algebra | null |
2039 | https://en.wikipedia.org/wiki/Avionics | Avionics | Avionics (a portmanteau of aviation and electronics) are the electronic systems used on aircraft. Avionic systems include communications, navigation, the display and management of multiple systems, and the hundreds of systems that are fitted to aircraft to perform individual functions. These can be as simple as a searc... | Technology | Aircraft components | null |
2052 | https://en.wikipedia.org/wiki/Array%20%28data%20structure%29 | Array (data structure) | In computer science, an array is a data structure consisting of a collection of elements (values or variables), of same memory size, each identified by at least one array index or key. An array is stored such that the position of each element can be computed from its index tuple by a mathematical formula. The simplest ... | Mathematics | Data structures and types | null |
2082 | https://en.wikipedia.org/wiki/Aeronautics | Aeronautics | Aeronautics is the science or art involved with the study, design, and manufacturing of air flight-capable machines, and the techniques of operating aircraft and rockets within the atmosphere.
While the term originally referred solely to operating the aircraft, it has since been expanded to include technology, busines... | Technology | Concepts of aviation | null |
2088 | https://en.wikipedia.org/wiki/Aphasia | Aphasia | Aphasia, also known as dysphasia, is an impairment in a person’s ability to comprehend or formulate language because of damage to specific brain regions. The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in developed countries. Aphasia ca... | Biology and health sciences | Disabilities | Health |
2089 | https://en.wikipedia.org/wiki/Aorta | Aorta | The aorta ( ; : aortas or aortae) is the main and largest artery in the human body, originating from the left ventricle of the heart, branching upwards immediately after, and extending down to the abdomen, where it splits at the aortic bifurcation into two smaller arteries (the common iliac arteries). The aorta distrib... | Biology and health sciences | Circulatory system | Biology |
2113 | https://en.wikipedia.org/wiki/Axiom%20of%20regularity | Axiom of regularity | In mathematics, the axiom of regularity (also known as the axiom of foundation) is an axiom of Zermelo–Fraenkel set theory that states that every non-empty set A contains an element that is disjoint from A. In first-order logic, the axiom reads:
The axiom of regularity together with the axiom of pairing implies that n... | Mathematics | Axiomatic systems | null |
2116 | https://en.wikipedia.org/wiki/Apple%20II | Apple II | Apple II ("apple two") is a series of microcomputers manufactured by Apple Computer, Inc. from 1977 to 1993. The first Apple II model, that gave the series its name, was designed by Steve Wozniak, and was first sold on June 10, 1977. Its success led to it being followed by the Apple II Plus, Apple IIe, Apple IIc, and A... | Technology | Early computers | null |
2120 | https://en.wikipedia.org/wiki/Aliphatic%20compound | Aliphatic compound | In organic chemistry, hydrocarbons (compounds composed solely of carbon and hydrogen) are divided into two classes: aromatic compounds and aliphatic compounds (; G. aleiphar, fat, oil). Aliphatic compounds can be saturated (in which all the C-C bonds are single requiring the structure to be completed, or 'saturated', b... | Physical sciences | Aliphatic hydrocarbons | Chemistry |
2147 | https://en.wikipedia.org/wiki/Armour | Armour | Armour (Commonwealth English) or armor (American English; see spelling differences) is a covering used to protect an object, individual, or vehicle from physical injury or damage, especially direct contact weapons or projectiles during combat, or from a potentially dangerous environment or activity (e.g. cycling, const... | Technology | Weapons | null |
2186 | https://en.wikipedia.org/wiki/Armadillo | Armadillo | Armadillos () are New World placental mammals in the order Cingulata. They form part of the superorder Xenarthra, along with the anteaters and sloths. 21 extant species of armadillo have been described, some of which are distinguished by the number of bands on their armor. All species are native to the Americas, where ... | Biology and health sciences | Mammals | null |
2202 | https://en.wikipedia.org/wiki/Analytic%20geometry | Analytic geometry | In mathematics, analytic geometry, also known as coordinate geometry or Cartesian geometry, is the study of geometry using a coordinate system. This contrasts with synthetic geometry.
Analytic geometry is used in physics and engineering, and also in aviation, rocketry, space science, and spaceflight. It is the foundat... | Mathematics | Geometry | null |
2208 | https://en.wikipedia.org/wiki/Arctic%20fox | Arctic fox | The Arctic fox (Vulpes lagopus), also known as the white fox, polar fox, or snow fox, is a small species of fox native to the Arctic regions of the Northern Hemisphere and common throughout the Arctic tundra biome. It is well adapted to living in cold environments, and is best known for its thick, warm fur that is also... | Biology and health sciences | Canines | Animals |
2219 | https://en.wikipedia.org/wiki/Aircraft%20carrier | Aircraft carrier | An aircraft carrier is a warship that serves as a seagoing airbase, equipped with a full-length flight deck and hangar facilities for supporting, arming, deploying and recovering shipborne aircraft. Typically it is the capital ship of a fleet (known as a carrier battle group), as it allows a naval force to project seab... | Technology | Naval warfare | null |
2221 | https://en.wikipedia.org/wiki/Apicomplexa | Apicomplexa | The Apicomplexa (also called Apicomplexia; single: apicomplexan) are organisms of a large phylum of mainly parasitic alveolates. Most possess a unique form of organelle structure that comprises a type of non-photosynthetic plastid called an apicoplastwith an apical complex membrane. The organelle's apical shape (e.g., ... | Biology and health sciences | SAR supergroup | Plants |
2230 | https://en.wikipedia.org/wiki/Analysis%20of%20algorithms | Analysis of algorithms | In computer science, the analysis of algorithms is the process of finding the computational complexity of algorithms—the amount of time, storage, or other resources needed to execute them. Usually, this involves determining a function that relates the size of an algorithm's input to the number of steps it takes (its ti... | Mathematics | Algorithms | null |
2246 | https://en.wikipedia.org/wiki/Analgesic | Analgesic | An analgesic drug, also called simply an analgesic, antalgic, pain reliever, or painkiller, is any member of the group of drugs used for pain management. Analgesics are conceptually distinct from anesthetics, which temporarily reduce, and in some instances eliminate, sensation, although analgesia and anesthesia are neu... | Biology and health sciences | Drugs and pharmacology | null |
2296 | https://en.wikipedia.org/wiki/Adrenal%20gland | Adrenal gland | The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. They are found above the kidneys. Each gland has an outer cortex which produces steroid hormones and an inner medulla. The adrenal cortex itself is... | Biology and health sciences | Animal: General | null |
2308 | https://en.wikipedia.org/wiki/Actinide | Actinide | The actinide () or actinoid () series encompasses at least the 14 metallic chemical elements in the 5f series, with atomic numbers from 89 to 102, actinium through nobelium. Number 103, lawrencium, is also generally included despite being part of the 6d transition series. The actinide series derives its name from the f... | Physical sciences | Chemical element groups | null |
2341 | https://en.wikipedia.org/wiki/Alkaloid | Alkaloid | Alkaloids are a broad class of naturally occurring organic compounds that contain at least one nitrogen atom. Some synthetic compounds of similar structure may also be termed alkaloids.
Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals. They can be purified from crud... | Biology and health sciences | Biochemistry and molecular biology | null |
2349 | https://en.wikipedia.org/wiki/Abstract%20data%20type | Abstract data type | In computer science, an abstract data type (ADT) is a mathematical model for data types, defined by its behavior (semantics) from the point of view of a user of the data, specifically in terms of possible values, possible operations on data of this type, and the behavior of these operations. This mathematical model con... | Mathematics | Data structures and types | null |
2362 | https://en.wikipedia.org/wiki/Antibody | Antibody | An antibody (Ab) or immunoglobulin (Ig) is a large, Y-shaped protein belonging to the immunoglobulin superfamily which is used by the immune system to identify and neutralize antigens such as bacteria and viruses, including those that cause disease. Antibodies can recognize virtually any size antigen, able to perceive ... | Biology and health sciences | Animal: General | null |
2388 | https://en.wikipedia.org/wiki/Antidepressant | Antidepressant | Antidepressants are a class of medications used to treat major depressive disorder, anxiety disorders, chronic pain, and addiction.
Common side effects of antidepressants include dry mouth, weight gain, dizziness, headaches, akathisia, sexual dysfunction, and emotional blunting. There is an increased risk of suicidal ... | Biology and health sciences | Psychiatric drugs | Health |
2392 | https://en.wikipedia.org/wiki/Anode | Anode | An anode usually is an electrode of a polarized electrical device through which conventional current enters the device. This contrasts with a cathode, which is usually an electrode of the device through which conventional current leaves the device. A common mnemonic is ACID, for "anode current into device". The directi... | Physical sciences | Electrochemistry | Chemistry |
2393 | https://en.wikipedia.org/wiki/Analog%20television | Analog television | Analog television is the original television technology that uses analog signals to transmit video and audio. In an analog television broadcast, the brightness, colors and sound are represented by amplitude, phase and frequency of an analog signal.
Analog signals vary over a continuous range of possible values which m... | Technology | Broadcasting | null |
2396 | https://en.wikipedia.org/wiki/Adhesive | Adhesive | Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation.
The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanical fastenings, and we... | Technology | Material and chemical | null |
2408 | https://en.wikipedia.org/wiki/Analytical%20chemistry | Analytical chemistry | Analytical chemistry studies and uses instruments and methods to separate, identify, and quantify matter. In practice, separation, identification or quantification may constitute the entire analysis or be combined with another method. Separation isolates analytes. Qualitative analysis identifies analytes, while quantit... | Physical sciences | Analytical chemistry | null |
2428 | https://en.wikipedia.org/wiki/Analog%20computer | Analog computer | An analog computer or analogue computer is a type of computation machine (computer) that uses physical phenomena such as electrical, mechanical, or hydraulic quantities behaving according to the mathematical principles in question (analog signals) to model the problem being solved. In contrast, digital computers repres... | Technology | Computer hardware | null |
2431 | https://en.wikipedia.org/wiki/Minute%20and%20second%20of%20arc | Minute and second of arc | A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn, or complete rotation, one arcminute is of a turn. The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on... | Physical sciences | Angle | Basics and measurement |
2443 | https://en.wikipedia.org/wiki/Acceleration | Acceleration | In mechanics, acceleration is the rate of change of the velocity of an object with respect to time. Acceleration is one of several components of kinematics, the study of motion. Accelerations are vector quantities (in that they have magnitude and direction). The orientation of an object's acceleration is given by the o... | Physical sciences | Classical mechanics | null |
2457 | https://en.wikipedia.org/wiki/Apoptosis | Apoptosis | Apoptosis (from ) is a form of programmed cell death that occurs in multicellular organisms and in some eukaryotic, single-celled microorganisms such as yeast. Biochemical events lead to characteristic cell changes (morphology) and death. These changes include blebbing, cell shrinkage, nuclear fragmentation, chromatin ... | Biology and health sciences | Cell processes | Biology |
2494 | https://en.wikipedia.org/wiki/Aurochs | Aurochs | The aurochs (Bos primigenius) ( or , plural aurochs or aurochsen) is an extinct species of bovine, considered to be the wild ancestor of modern domestic cattle. With a shoulder height of up to in bulls and in cows, it was one of the largest herbivores in the Holocene; it had massive elongated and broad horns that rea... | Biology and health sciences | Artiodactyla | null |
2500 | https://en.wikipedia.org/wiki/Anus | Anus | In mammals, invertebrates and most fish, the anus (: anuses or ani; from Latin, 'ring' or 'circle') is the external body orifice at the exit end of the digestive tract (bowel), i.e. the opposite end from the mouth. Its function is to facilitate the expulsion of wastes that remain after digestion.
Bowel contents that p... | Biology and health sciences | Gastrointestinal tract | Biology |
2504 | https://en.wikipedia.org/wiki/Amphetamine | Amphetamine | Amphetamine (contracted from alpha-methylphenethylamine) is a central nervous system (CNS) stimulant that is used in the treatment of attention deficit hyperactivity disorder (ADHD), narcolepsy, and obesity; it is also used to treat binge eating disorder in the form of its inactive prodrug lisdexamfetamine. Amphetamine... | Biology and health sciences | Drugs and pharmacology | null |
4083803 | https://en.wikipedia.org/wiki/Fieldnotes | Fieldnotes | Fieldnotes refer to qualitative notes recorded by scientists or researchers in the course of field research, during or after their observation of a specific organism or phenomenon they are studying. The notes are intended to be read as evidence that gives meaning and aids in the understanding of the phenomenon. Fieldno... | Physical sciences | Research methods | Basics and measurement |
566405 | https://en.wikipedia.org/wiki/Saltwater%20crocodile | Saltwater crocodile | The saltwater crocodile (Crocodylus porosus) is a crocodilian native to saltwater habitats, brackish wetlands and freshwater rivers from India's east coast across Southeast Asia and the Sundaland to northern Australia and Micronesia. It has been listed as Least Concern on the IUCN Red List since 1996. It was hunted for... | Biology and health sciences | Crocodilia | Animals |
566692 | https://en.wikipedia.org/wiki/Bait%20%28luring%20substance%29 | Bait (luring substance) | Bait is any appetizing substance (e.g. food) used to attract prey when hunting or fishing, most commonly in the form of trapping (e.g. mousetrap and bird trap), ambushing (e.g. from a hunting blind) and angling.
Baiting is a ubiquitous practice in both recreational (especially angling) and commercial fishing, but the ... | Technology | Hunting and fishing | null |
566959 | https://en.wikipedia.org/wiki/Standard%20electrode%20potential | Standard electrode potential | In electrochemistry, standard electrode potential , or , is a measure of the reducing power of any element or compound. The IUPAC "Gold Book" defines it as; "the value of the standard emf (electromotive force) of a cell in which molecular hydrogen under standard pressure is oxidized to solvated protons at the left-han... | Physical sciences | Electrochemistry | Chemistry |
567471 | https://en.wikipedia.org/wiki/Sea%20otter | Sea otter | The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between , making them the heaviest members of the weasel family, but among the smallest marine mammals. Unlike most marine mammals, the sea otter's primary form of ins... | Biology and health sciences | Carnivora | null |
567489 | https://en.wikipedia.org/wiki/Pliers | Pliers | Pliers are a hand tool used to hold objects firmly, possibly developed from tongs used to handle hot metal in Bronze Age Europe. They are also useful for bending and physically compressing a wide range of materials. Generally, pliers consist of a pair of metal first-class levers joined at a fulcrum positioned closer to... | Technology | Hand tools | null |
568715 | https://en.wikipedia.org/wiki/Packaging | Packaging | Packaging is the science, art and technology of enclosing or protecting products for distribution, storage, sale, and use. Packaging also refers to the process of designing, evaluating, and producing packages. Packaging can be described as a coordinated system of preparing goods for transport, warehousing, logistics, s... | Technology | Containers | null |
568726 | https://en.wikipedia.org/wiki/Giant%20star | Giant star | A giant star has a substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature. They lie above the main sequence (luminosity class V in the Yerkes spectral classification) on the Hertzsprung–Russell diagram and correspond to luminosity classes II and III. The terms gi... | Physical sciences | Stellar astronomy | null |
569005 | https://en.wikipedia.org/wiki/Gmail | Gmail | Gmail is the email service provided by Google. it had 1.5 billion active users worldwide, making it the largest email service in the world. It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party... | Technology | Communication | null |
569180 | https://en.wikipedia.org/wiki/Plant%20propagation | Plant propagation | Plant propagation is the process by which new plants grow from various sources, including seeds, cuttings, and other plant parts. Plant propagation can refer to both man-made and natural processes.
Propagation typically occurs as a step in the overall cycle of plant growth. For seeds, it happens after ripening and dis... | Technology | Horticulture | null |
569213 | https://en.wikipedia.org/wiki/Dimethyl%20sulfoxide | Dimethyl sulfoxide | Dimethyl sulfoxide (DMSO) is an organosulfur compound with the formula (CH3)2. This colorless liquid is the sulfoxide most widely used commercially. It is an important polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It has a ... | Physical sciences | Concepts: General | Chemistry |
569315 | https://en.wikipedia.org/wiki/Dimethyl%20ether | Dimethyl ether | Dimethyl ether (DME; also known as methoxymethane) is the organic compound with the formula CH3OCH3,
(sometimes ambiguously simplified to C2H6O as it is an isomer of ethanol). The simplest ether, it is a colorless gas that is a useful precursor to other organic compounds and an aerosol propellant that is currently bei... | Physical sciences | Esters and ethers | Chemistry |
569459 | https://en.wikipedia.org/wiki/White-tailed%20deer | White-tailed deer | The white-tailed deer (Odocoileus virginianus), also known commonly as the whitetail and the Virginia deer, is a medium-sized species of deer native to North America, Central America, and South America as far south as Peru and Bolivia, where it predominately inhabits high mountain terrains of the Andes. It has also bee... | Biology and health sciences | Deer | Animals |
569480 | https://en.wikipedia.org/wiki/Receptor%20%28biochemistry%29 | Receptor (biochemistry) | In biochemistry and pharmacology, receptors are chemical structures, composed of protein, that receive and transduce signals that may be integrated into biological systems. These signals are typically chemical messengers which bind to a receptor and produce physiological responses such as change in the electrical activ... | Biology and health sciences | Cell processes | Biology |
2151693 | https://en.wikipedia.org/wiki/Cassegrain%20reflector | Cassegrain reflector | The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. This design puts the fo... | Technology | Telescope | null |
2152225 | https://en.wikipedia.org/wiki/Thin-layer%20chromatography | Thin-layer chromatography | Thin-layer chromatography (TLC) is a chromatography technique that separates components in non-volatile mixtures.
It is performed on a TLC plate made up of a non-reactive solid coated with a thin layer of adsorbent material. This is called the stationary phase. The sample is deposited on the plate, which is eluted wit... | Physical sciences | Chromatography | Chemistry |
2152928 | https://en.wikipedia.org/wiki/Archaeognatha | Archaeognatha | The Archaeognatha are an order of apterygotes, known by various common names such as jumping bristletails. Among extant insect taxa they are some of the most evolutionarily primitive; they appeared in the Middle Devonian period at about the same time as the arachnids. Specimens that closely resemble extant species have... | Biology and health sciences | Insects: General | Animals |
2154225 | https://en.wikipedia.org/wiki/Psocoptera | Psocoptera | Psocoptera () are a paraphyletic group of insects that are commonly known as booklice, barklice or barkflies. The name Psocoptera has been replaced with Psocodea in recent literature, with the inclusion of the former order Phthiraptera into Psocodea (as part of the suborder Troctomorpha).
These insects first appeared ... | Biology and health sciences | Insects: General | Animals |
2154325 | https://en.wikipedia.org/wiki/Cannabis%20indica | Cannabis indica | Cannabis indica is an annual plant species in the family Cannabaceae indigenous to the Hindu Kush mountains of Southern Asia. The plant produces large amounts of tetrahydrocannabinol (THC) and tetrahydrocannabivarin (THCV), with total cannabinoid levels being as high as 53.7%. It is now widely grown in China, India, Ne... | Biology and health sciences | Rosales | Plants |
2154347 | https://en.wikipedia.org/wiki/Cannabis%20ruderalis | Cannabis ruderalis | Cannabis ruderalis is a variety, subspecies, or species of Cannabis native to Central and Eastern Europe and Russia. It contains a relatively low quantity of psychoactive compound tetrahydrocannabinol (THC) and does not require photoperiod to blossom (unlike C. indica and C. sativa). Some scholars accept C. ruderalis a... | Biology and health sciences | Rosales | Plants |
13224331 | https://en.wikipedia.org/wiki/Ecological%20resilience | Ecological resilience | In ecology, resilience is the capacity of an ecosystem to respond to a perturbation or disturbance by resisting damage and subsequently recovering. Such perturbations and disturbances can include stochastic events such as fires, flooding, windstorms, insect population explosions, and human activities such as deforestat... | Biology and health sciences | Ecology | Biology |
13233321 | https://en.wikipedia.org/wiki/Clostridium%20tetani | Clostridium tetani | Clostridium tetani is a common soil bacterium and the causative agent of tetanus. Vegetative cells of Clostridium tetani are usually rod-shaped and up to 2.5 μm long, but they become enlarged and tennis racket- or drumstick-shaped when forming spores. C. tetani spores are extremely hardy and can be found globally in so... | Biology and health sciences | Gram-positive bacteria | Plants |
7115718 | https://en.wikipedia.org/wiki/Ball-and-stick%20model | Ball-and-stick model | In chemistry, the ball-and-stick model is a molecular model of a chemical substance which displays both the three-dimensional position of the atoms and the bonds between them. The atoms are typically represented by spheres, connected by rods which represent the bonds. Double and triple bonds are usually represented by ... | Physical sciences | Substance | Chemistry |
14383139 | https://en.wikipedia.org/wiki/Allotropes%20of%20sulfur | Allotropes of sulfur | The element sulfur exists as many allotropes. In number of allotropes, sulfur is second only to carbon. In addition to the allotropes, each allotrope often exists in polymorphs (different crystal structures of the same covalently bonded Sn molecules) delineated by Greek prefixes (α, β, etc.).
Furthermore, because elem... | Physical sciences | Group 16 | Chemistry |
5444531 | https://en.wikipedia.org/wiki/Oriental%20rat%20flea | Oriental rat flea | The Oriental rat flea (Xenopsylla cheopis), also known as the tropical rat flea or the rat flea, is a parasite of rodents, primarily of the genus Rattus, and is a primary vector for bubonic plague and murine typhus. This occurs when a flea that has fed on an infected rodent bites a human, although this flea can live on... | Biology and health sciences | Insects: General | Animals |
5446107 | https://en.wikipedia.org/wiki/Plain%20weave | Plain weave | Plain weave (also called tabby weave, linen weave or taffeta weave) is the most basic of three fundamental types of textile weaves (along with satin weave and twill). It is strong and hard-wearing, and is used for fashion and furnishing fabrics. Fabrics with a plain weave are generally strong, durable, and have a smoot... | Technology | Weaving | null |
5449464 | https://en.wikipedia.org/wiki/Vizing%27s%20theorem | Vizing's theorem | In graph theory, Vizing's theorem states that every simple undirected graph may be edge colored using a number of colors that is at most one larger than the maximum degree of the graph. At least colors are always necessary, so the undirected graphs may be partitioned into two classes: "class one" graphs for which co... | Mathematics | Graph theory | null |
971658 | https://en.wikipedia.org/wiki/Helminthiasis | Helminthiasis | Helminthiasis, also known as worm infection, is any macroparasitic disease of humans and other animals in which a part of the body is infected with parasitic worms, known as helminths. There are numerous species of these parasites, which are broadly classified into tapeworms, flukes, and roundworms. They often live in ... | Biology and health sciences | Concepts | Health |
971961 | https://en.wikipedia.org/wiki/Plant%20reproductive%20morphology | Plant reproductive morphology | Plant reproductive morphology is the study of the physical form and structure (the morphology) of those parts of plants directly or indirectly concerned with sexual reproduction.
Among all living organisms, flowers, which are the reproductive structures of angiosperms, are the most varied physically and show a corresp... | Biology and health sciences | Plant reproduction | null |
972457 | https://en.wikipedia.org/wiki/Mass%20wasting | Mass wasting | Mass wasting, also known as mass movement, is a general term for the movement of rock or soil down slopes under the force of gravity. It differs from other processes of erosion in that the debris transported by mass wasting is not entrained in a moving medium, such as water, wind, or ice. Types of mass wasting include ... | Physical sciences | Geomorphology: General | Earth science |
972601 | https://en.wikipedia.org/wiki/Elementary%20equivalence | Elementary equivalence | In model theory, a branch of mathematical logic, two structures M and N of the same signature σ are called elementarily equivalent if they satisfy the same first-order σ-sentences.
If N is a substructure of M, one often needs a stronger condition. In this case N is called an elementary substructure of M if every first... | Mathematics | Model theory | null |
972784 | https://en.wikipedia.org/wiki/Military%20aviation | Military aviation | Military aviation comprises military aircraft and other flying machines for the purposes of conducting or enabling aerial warfare, including national airlift (air cargo) capacity to provide logistical supply to forces stationed in a war theater or along a front. Airpower includes the national means of conducting such w... | Technology | Military aviation | null |
972800 | https://en.wikipedia.org/wiki/Abyssal%20plain | Abyssal plain | An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between . Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth's surface. They are among the flattest, smoothest, and least explored regions on Earth. Abyssal... | Physical sciences | Oceanic and coastal landforms | null |
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