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Transition
Transition or transitional may refer to: Mathematics, science, and technology Biology * Transition (genetics), a point mutation that changes a purine nucleotide to another purine (A ↔ G) or a pyrimidine nucleotide to another pyrimidine (C ↔ T) * Transitional fossil, any fossilized remains of a lifeform that exhibits the characteristics of two distinct taxonomic groups * A phase during childbirth contractions during which the cervix completes its dilation Gender and sex * Gender transition, the process of changing one's gender presentation to accord with one's internal sense of one's gender – the idea of what it means to be a man or woman * Gender-affirming therapy, the physical aspect of a gender transition ** Gender-affirming surgery, surgical intervention a part of medical gender affirmation Physics * Phase transition, a transformation of the state of matter; for example, the change between a solid and a liquid, between liquid and gas or between gas and plasma * Quantu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition (genetics)
Transition, in genetics and molecular biology, refers to a point mutation that changes a purine nucleotide to another purine ( A ↔ G), or a pyrimidine nucleotide to another pyrimidine ( C ↔ T). Approximately two out of three single nucleotide polymorphisms (SNPs) are transitions. Transitions can be caused by oxidative deamination and tautomerization. Although there are twice as many possible transversions, transitions appear more often in genomes, possibly due to the molecular mechanisms that generate them. 5-Methylcytosine is more prone to transition than unmethylated cytosine, due to spontaneous deamination. This mechanism is important because it dictates the rarity of CpG islands The CpG sites or CG sites are regions of DNA where a cytosine nucleotide is followed by a guanine nucleotide in the linear sequence of bases along its 5' → 3' direction. CpG sites occur with high frequency in genomic regions called CpG .... See also * Transversion Refere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition State
In chemistry, the transition state of a chemical reaction is a particular configuration along the reaction coordinate. It is defined as the state corresponding to the highest potential energy along this reaction coordinate. It is often marked with the double dagger ‡ symbol. As an example, the transition state shown below occurs during the SN2 reaction of bromoethane with a hydroxide anion: The activated complex of a reaction can refer to either the transition state or to other states along the reaction coordinate between reactants and products, especially those close to the transition state. Peter Atkins and Julio de Paula, ''Physical Chemistry'' (8th ed., W.H. Freeman 2006), p.809 According to the transition state theory, once the reactants have passed through the transition state configuration, they always continue to form products. History of concept The concept of a transition state has been important in many theories of the rates at which chemical react ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brexit Withdrawal Agreement
The Brexit withdrawal agreement, officially titled Agreement on the withdrawal of the United Kingdom of Great Britain and Northern Ireland from the European Union and the European Atomic Energy Community, is a treaty between the European Union (EU), Euratom, and the United Kingdom (UK), signed on 24 January 2020, setting the terms of the withdrawal of the UK from the EU and Euratom. The text of the treaty was published on 17 October 2019, and is a renegotiated version of an agreement published half a year earlier. The earlier version of the withdrawal agreement was rejected by the House of Commons on three occasions, leading to the resignation of Theresa May as Prime Minister and the appointment of Boris Johnson as the new prime minister on 24 July 2019. The Parliament of the United Kingdom gave its approval to the agreement on 23 January 2020 and the UK government deposited Britain's instrument of ratification on 29 January 2020. The agreement was ratified by the Council of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Presidential Transition
In the United States, a presidential transition is the process during which the president-elect of the United States prepares to take over the administration of the federal government of the United States from the incumbent president. Though planning for transition by a non-incumbent candidate can start at any time before a presidential election and in the days following, the transition formally starts when the General Services Administration (GSA) declares an “apparent winner” of the election, thereby releasing the funds appropriated by Congress for the transition, and continues until inauguration day, when the president-elect takes the oath of office, at which point the powers, immunities, and responsibilities of the presidency are legally transferred to the new president. The 20th Amendment to the Constitution, adopted in 1933, moved the beginning and ending of the terms of the president and vice president from March 4 to January 20, thereby also shortening the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Peaceful Transition Of Power
A peaceful transition or transfer of power is a concept important to democratic governments in which the leadership of a government peacefully hands over control of government to a newly-elected leadership. This may be after elections or during the transition from a different kind of political regime, such as the postcommunist period after the fall of the Soviet Union. In scholarship examining democratization and emerging democracies, study of the successful transitions of power is used to understand the transition to constitutional democracy and the relative stability of that government. A 2014 study concluded that 68 countries had never had a peaceful transition of power due to an election since 1788. Democratization studies In scholarship examining democratization and emerging democracies, study of the successful transitions of power is used to understand the transition to constitutional democracy and the relative stability of that government ( democratic consolidation).} ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Social Change
Social change is the alteration of the social order of a society which may include changes in social institutions, social behaviours or social relations. Definition Social change may not refer to the notion of social progress or sociocultural evolution, the philosophical idea that society moves forward by evolutionary means. It may refer to a paradigmatic change in the socio-economic structure, for instance the transition from feudalism to capitalism, or hypothetical future transition to some form of post-capitalism. Social development refers to how people develop social and emotional skills across the lifespan, with particular attention to childhood and adolescence. Healthy social development allows us to form positive relationships with family, friends, teachers, and other people in our lives. Accordingly, it may also refer to social revolution, such as the Socialist revolution presented in Marxism, or to other social movements, such as women's suffrage or the ci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition Management (governance)
Transition management is a governance approach that aims to facilitate and accelerate sustainability transitions through a participatory process of visioning, learning and experimenting. In its application, transition management seeks to bring together multiple viewpoints and multiple approaches in a 'transition arena'. Participants are invited to structure their shared problems with the current system and develop shared visions and goals which are then tested for practicality through the use of experimentation, learning and reflexivity. The model is often discussed in reference to sustainable development and the possible use of the model as a method for change. Key principles to transition management as a form of governance: * seeks to widen participation by taking a multi-actor approach in order to encompass societal values and beliefs * takes a long-term perspective (between 1-3 generations) creating a basket of visions in which short-term objectives can be identified * focus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Democratic Transition
Democratization, or democratisation, is the transition to a more democratic political regime, including substantive political changes moving in a democratic direction. It may be a hybrid regime in transition from an authoritarian regime to a full democracy, a transition from an authoritarian political system to a semi-democracy or transition from a semi-authoritarian political system to a democratic political system. The outcome may be consolidated (as it was for example in the United Kingdom) or democratization may face frequent reversals (as happened in Chile). Different patterns of democratization are often used to explain other political phenomena, such as whether a country goes to a war or whether its economy grows. Whether and to what extent democratization occurs has been attributed to various factors, including economic development, historical legacies, civil society, and international processes. Some accounts of democratization emphasize how elites drove democratiza ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Locomotive
A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels. Early internal combustion locomotives and railcars used kerosene and gasoline as their fuel. Rudolf Diesel patented his first compression-ignition engine in 1898, and steady improvements to the design of diesel engines reduced their physical size and improved their power-to-weight ratios to a point where one could be mounted in a locomotive. Internal combustion engines only operate efficiently within a limited power band, and while low power gasoline engines could be coupled to mechanical transmissions, the more powerful diesel engines required the development of new forms of transmission. This is because clutches would need to be very large at these power levels and would not fit in a standard -wide locomotive frame, or wear to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition (roadable Aircraft)
The Terrafugia Transition is a light sport, roadable airplane under development by Terrafugia since 2006. The Rotax 912ULS piston engine powered, carbon-fiber vehicle is planned to have a flight range of using either automotive premium grade unleaded gasoline or 100LL avgas and a cruising flight speed of . Equipment includes a Dynon Skyview glass panel avionics system, an airframe parachute, and an optional autopilot. On the road, it can drive up to with normal traffic. The Transition Production Prototype's folded dimensions of high, wide and long are designed to fit within a standard household garage. When operated as a car, the engine power take-off near the propeller engages a variable-diameter pulley CVT automatic transmission to send power to the trailing-suspension mounted rear wheels via half-shafts powering belt drives. In flight, the engine drives a pusher propeller. The Transition has folding wings and a twin tail. Design and development The experimen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photochromic Lens
A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly Ultraviolet, ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken significantly within about a minute of exposure to bright light and take somewhat longer to clear. A range of clear and dark transmittances is available. In one sort of technology, molecules of silver chloride or another silver halide are embedded in photochromic lenses. They are transparent to visible light without significant ultraviolet component, which is normal for artificial lighting. In another sort of technology, organic photochromic molecules, when exposed to ultraviolet (UV) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transition (computer Science)
Transition refers to a computer science paradigm in the context of communication systems which describes the change of communication mechanisms, i.e., functions of a communication system, in particular, service and protocol components. In a transition, communication mechanisms within a system are replaced by functionally comparable mechanisms with the aim to ensure the highest possible quality, e.g., as captured by the quality of service. Transitions enable communication systems to adapt to changing conditions during runtime. This change in conditions can, for example, be a rapid increase in the load on a certain service that may be caused, e.g., by large gatherings of people with mobile devices. A transition often impacts multiple mechanisms at different communication layers of a layered architecture. Mechanisms are given as conceptual elements of a networked communication system and are linked to specific functional units, for example, as a service or protocol component. In some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
