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Sinistral And Dextral
Sinistral and dextral, in some scientific fields, are the two types of chirality ("handedness") or relative direction. The terms are derived from the Latin words for "left" (''sinister'') and "right" (''dexter''). Other disciplines use different terms (such as dextro- and laevo-rotary in chemistry, or clockwise and anticlockwise in physics) or simply use left and right (as in anatomy). Relative direction and chirality are distinct concepts. Relative direction is from the point of view of the observer; a completely symmetric object has a left side and a right side, from the observer's point of view, if the top and bottom and direction of observation are defined. Chirality, however, is observer-independent: no matter how one looks at a right-hand screw thread, it remains different from a left-hand screw thread. Therefore, a symmetric object has sinistral and dextral directions arbitrarily defined by the position of the observer, while an asymmetric object that shows chirality may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chirality
Chirality () is a property of asymmetry important in several branches of science. The word ''chirality'' is derived from the Greek (''kheir''), "hand", a familiar chiral object. An object or a system is ''chiral'' if it is distinguishable from its mirror image; that is, it cannot be superposed (not to be confused with superimposed) onto it. Conversely, a mirror image of an ''achiral'' object, such as a sphere, cannot be distinguished from the object. A chiral object and its mirror image are called '' enantiomorphs'' (Greek, "opposite forms") or, when referring to molecules, ''enantiomers''. A non-chiral object is called ''achiral'' (sometimes also ''amphichiral'') and can be superposed on its mirror image. The term was first used by Lord Kelvin in 1893 in the second Robert Boyle Lecture at the Oxford University Junior Scientific Club which was published in 1894: Human hands are perhaps the most recognized example of chirality. The left hand is a non-superposable mirror ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platichthys Flesus - En
''Platichthys'' is a genus of flatfish native to the North Pacific and North Atlantic oceans. Despite being in the family Pleuronectidae (popularly known as righteye flounders), all four species in the genus ''Platichthys'' are often "lefteyed", i.e. they lie on the sea bottom on their right side, with both eyes on the left side. Species There are currently four recognized species in this genus: References Further reading * Momigliano, M.; G.P.J. Denys; H. Jokinen; and J. Merilä (2018). Platichthys solemdali sp. nov. (Actinopterygii, Pleuronectiformes): A New Flounder Species From the Baltic Sea. Front. Mar. Sci. 5(225). Platichthys, Pleuronectidae {{Pleuronectiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Left And Right (other)
Left and right or left–right may refer to: * Left and right directions, body relative directions in terms of an observer * Left and right as designating different chirality, chiralities, independent of an observer (as in left glove, left-eyed flatfish, left-handed screw threads) * Left- and right-handedness * Left- and right-laterality * Left- and right-ocular dominance * Left–right political spectrum Left and right or Left Right may also refer to: Mathematics * Left and right (algebra) * Orientation (geometry) * One-sided limits in calculus and other derived meanings Arts * Left & Right (album), ''Left & Right'' (album), a 1968 album by Rahsaan Roland Kirk * Left & Right (D'Angelo song), "Left & Right" (D'Angelo song), 2000 *Left & Right (Seventeen song), "Left & Right" (Seventeen song), 2020 *Left and Right (Charlie Puth song), "Left and Right" (Charlie Puth song), 2022, featuring Jung Kook * Left, Right, "Left, Right", YG song, 2013 * Left Right (XG song), "Left Right ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laterality
The term laterality refers to the preference most humans show for one side of their Human body, body over the other. Examples include Handedness, left-handedness/right-handedness and left/right-footedness; it may also refer to the primary use of the left or right hemisphere in the brain. It may also apply to animals or plants. The majority of tests have been conducted on humans, specifically to determine the effects on language. Human Most humans are right-handed. Many are also right-sided in general (that is, they prefer to use their right human eye, eye, right foot and right ear if forced to make a choice between the two). The reasons for this are not fully understood, but it is thought that because the left cerebral hemisphere of the brain controls the right side of the body, the right side is generally stronger; it is suggested that the Lateralization of brain function, left cerebral hemisphere is dominant over the right in most humans because in 90–92% of all humans, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeremy (snail)
Jeremy was a left-coiled garden snail studied by researchers from the University of Nottingham. The snail had a rare condition that caused its shell to coil to the left; in most snails the shell coils to the right. It was hoped that the condition would be due to a mutation, and that genes identified from this snail and its offspring would help scientists unlock genetic markers in humans and other animals. At first it was thought to be a rare genetic mutation, although later work revealed that it was likely due to an accident in early development. Jeremy was named after the left-wing British Labour politician Jeremy Corbyn, on account of it being a " lefty" snail, but also due to Corbyn's reported love of gardening. The snail became famous worldwide after a public appeal to find other left-coiled snails for a mate. Jeremy had 56 offspring and died on 11 October 2017, aged "at least two" years. Life A retired scientist found Jeremy in southwest London. He contacted the Univer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicity (other)
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Helicity may refer to: *Helicity (fluid mechanics), the extent to which corkscrew-like motion occurs *Helicity (particle physics), the projection of the spin onto the direction of momentum *Magnetic helicity, the extent to which a magnetic field "wraps around itself" *Circular dichroism, the differential absorption of left and right circularly polarized light * A form of axial chirality * A former name for inherent chirality See also *Helix A helix (; ) is a shape like a cylindrical coil spring or the thread of a machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. Helices are important in biology, as the DNA molecule is for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heraldry
Heraldry is a discipline relating to the design, display and study of armorial bearings (known as armory), as well as related disciplines, such as vexillology, together with the study of ceremony, Imperial, royal and noble ranks, rank and genealogy, pedigree. Armory, the best-known branch of heraldry, concerns the design and transmission of the Achievement (heraldry), heraldic achievement. The achievement, or armorial bearings usually includes a coat of arms on a escutcheon (heraldry), shield, helmet (heraldry), helmet and Crest (heraldry), crest, together with any accompanying devices, such as supporters, Heraldic badge, badges, Heraldic flag, heraldic banners and mottoes. Although the use of various devices to signify individuals and groups goes back to Ancient history, antiquity, both the form and use of such devices varied widely, as the concept of regular, hereditary designs, constituting the distinguishing feature of heraldry, did not develop until the High Middle Ages. It i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dexter And Sinister
''Dexter'' and ''sinister'' are terms used in heraldry to refer to specific locations in an Escutcheon (heraldry), escutcheon bearing a coat of arms, and to the other elements of an Achievement (heraldry), achievement. ''Dexter'' (Latin for 'right') indicates the right-hand side of the shield, as regarded by the bearer, i.e. the bearer's proper right, and to the left as seen by the viewer. ''Sinister'' (Latin for 'left') indicates the left-hand side as regarded by the bearer – the bearer's proper left, and to the right as seen by the viewer. In vexillology, the terms ''Glossary of vexillology, hoist'' and ''Glossary of vexillology, fly'' are preferred, although these are not direct equivalents, as their meaning varies with the direction in which the flag is flying. Significance The dexter side is considered the side of greater honour, for example when Impalement (heraldry), impaling two arms. Thus, by tradition, a husband's arms occupy the dexter half of his shield, his wif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Zone
In geology, a shear zone is a thin zone within the Earth's crust or upper mantle that has been strongly deformed, due to the walls of rock on either side of the zone slipping past each other. In the upper crust, where rock is brittle, the shear zone takes the form of a fracture called a Fault (geology), fault. In the lower crust and mantle, the extreme conditions of pressure and temperature make the rock ductile. That is, the rock is capable of slowly deforming without fracture, like hot metal being worked by a blacksmith. Here the shear zone is a wider zone, in which the ductile rock has slowly flowed to accommodate the relative motion of the rock walls on either side. Because shear zones are found across a wide depth-range, a great variety of different rock types with their characteristic structures are associated with shear zones. General introduction A shear zone is a zone of strong deformation (with a high strain rate) surrounded by rocks with a lower state of Deforma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a Fracture (geology), planar fracture or discontinuity in a volume of Rock (geology), rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust (geology), crust result from the action of Plate tectonics, plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction, subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the Plane (geometry), plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology
Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology. It is integrated with Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages. By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle the geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth. Geology provides evidence for plate tectonics, the ev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike Slip Fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A '' fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
