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Punctum Vitreum
Punctum, plural puncta, adjective punctate, is an anatomical term for a sharp point or tip. It may also refer to: Medical *Lacrimal punctum, a minute opening on the margins of the eyelids that collect tears produced by the lacrimal glands *Blind spot (vision), or ''punctum cecum'', the blind spot in human vision corresponding to the location of the optic disk * Erb's point (neurology) or ''punctum nervosum'', a nerve point in the human neck *Imperforate lacrimal punctum, a congenital disorder of dogs Unrelated species named punctum *''Allium punctum'', a species of wild onion *''Amyna punctum'', a moth of the family Noctuidae *''Cinguloterebra punctum'', a sea snail of the family Terebridae *''Phylloxiphia punctum'', a moth of the family Sphingidae *''Sepsis punctum'', a fly of the family Sepsidae *''Zygaena punctum'', a moth of the family Zygaenidae Other * ''Punctum'' (gastropod), a genus of land snails *Punctum delens, typographic marks used to indicate deletion * Neume, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lacrimal Punctum
The lacrimal punctum (plural ''puncta'') or lacrimal point, is a minute opening on the summits of the lacrimal papillae, seen on the margins of the eyelids at the lateral extremity of the lacrimal lake. There are two lacrimal puncta in the medial (inside) portion of each eyelid. Normally, the puncta dip into the lacrimal lake. Together, they function to collect tears produced by the lacrimal glands. The fluid is conveyed through the lacrimal canaliculi to the lacrimal sac, and thence via the nasolacrimal duct to the inferior nasal meatus of the nasal passage. Additional images File:Lacrimal punctum.jpg, A close up of a lacrimal punctum. File:Lower lacrimal punctum.jpg, Lower lacrimal punctum through slit lamp biomicroscope See also * Imperforate lacrimal punctum *Lacrimal apparatus The lacrimal apparatus is the physiological system containing the Orbit (anatomy), orbital structures for tears, tear production and drainage.Cassin, B. and Solomon, S. ''Dictionary of Eye Termino ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zygaena Punctum
''Zygaena punctum'' is a species of moth in the family Zygaenidae. It is found in Poland, the Czech Republic, Slovakia, Austria, Slovenia, Italy, the Balkan Peninsula, Moldova, Ukraine, Russia and Turkey. Technical description and variation (Seitz) ''Z. punctum'' O. Represents the preceding African insect ''Zygaena favonia'' Frr.">Zygaena_favonia.html" ;"title="''Zygaena favonia">''Zygaena favonia'' Frr.in the South of Europe. Position of the red spots as in ''Zygaena sarpedon'', but the apical spot enlarged, appearing washed out, being deeper red centrally and pale at the edges. Red abdominal belt always absent. Name-typical ''punctum'' occurs at the north-east coasts of the Mediterranean Sea, as far as Armenia; small, the markings of forewing more or less confluent, the hindmargin remaining broadly black. — In ''dystrepta'' Fisch.-Wald. now ''Zygaena punctum dystrepta'' Fischer de Waldheim, 1832 from S. E. Europe and Asia Minor, the hindmargin is only very narrowly shaded wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quarter-hour
An hour (symbol: h; also abbreviated hr) is a unit of time conventionally reckoned as of a day and scientifically reckoned between 3,599 and 3,601 seconds, depending on the speed of Earth's rotation. There are 60 minutes in an hour, and 24 hours in a day. The hour was initially established in the ancient Near East as a variable measure of of the night or daytime. Such seasonal, temporal, or unequal hours varied by season and latitude. Equal or equinoctial hours were taken as of the day as measured from noon to noon; the minor seasonal variations of this unit were eventually smoothed by making it of the mean solar day. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second. In the modern metric system, hours are an accepted unit of time defined as 3,600 atomic seconds. However, on rare occasions an hour may incorporate a positive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Camera Lucida (book)
''Camera Lucida: Reflections on Photography'' (french: La chambre claire) is a short book published in 1980 by the French literary theorist and philosopher Roland Barthes. It is simultaneously an inquiry into the nature and essence of photography and a eulogy to Barthes' late mother. The book investigates the effects of photography on the spectator (as distinct from the photographer, and also from the object photographed, which Barthes calls the "spectrum"). In a deeply personal discussion of the lasting emotional effect of certain photographs, Barthes considers photography as asymbolic, irreducible to the codes of language or culture, acting on the body as much as on the mind. The book develops the twin concepts of ''studium'' and ''punctum'': ''studium'' denoting the cultural, linguistic, and political interpretation of a photograph, ''punctum'' denoting the wounding, personally touching detail which establishes a direct relationship with the object or person within it. ''C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equant
Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets. The equant is used to explain the observed speed change in different stages of the planetary orbit. This planetary concept allowed Ptolemy to keep the theory of uniform circular motion alive by stating that the path of heavenly bodies was uniform around one point and circular around another point. Placement The equant point (shown in the diagram by the large • ), is placed so that it is directly opposite to Earth from the deferent's center, known as the ''eccentric'' (represented by the × ). A planet or the center of an epicycle (a smaller circle carrying the planet) was conceived to move at a constant angular speed with respect to the equant. In other words, to a hypothetical observer placed at the equant point, the epicycle's center (indicated by the small · ) would appear to move at a st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neume
A neume (; sometimes spelled neum) is the basic element of Western and Eastern systems of musical notation prior to the invention of five-line staff notation. The earliest neumes were inflective marks that indicated the general shape but not necessarily the exact notes or rhythms to be sung. Later developments included the use of heightened neumes that showed the relative pitches between neumes, and the creation of a four-line musical staff that identified particular pitches. Neumes do not generally indicate rhythm, but additional symbols were sometimes juxtaposed with neumes to indicate changes in articulation, duration, or tempo. Neumatic notation was later used in medieval music to indicate certain patterns of rhythm called rhythmic modes, and eventually evolved into modern musical notation. Neumatic notation remains standard in modern editions of plainchant. Etymology The word "neume" entered the English language in the Middle English forms "newme", "nevme", "neme" in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctum Delens
When used as a diacritic mark, the term dot is usually reserved for the ''interpunct'' ( · ), or to the glyphs "combining dot above" ( ◌̇ ) and "combining dot below" ( ◌̣ ) which may be combined with some letters of the extended Latin alphabets in use in Central European languages and Vietnamese. Dots Overdot Language scripts or transcription schemes that use the dot above a letter as a diacritical mark: * In some forms of Arabic romanization, stands for ''ghayin'' (غ); stands for qāf (ق). * The Latin orthography for Chechen includes ċ, ç̇, ġ, q̇, and ẋ. * In Emilian-Romagnol, ''ṅ ṡ ż'' are used to represent . * Traditional Irish typography, where the dot denotes lenition, and is called a or "dot of lenition": ''ḃ ċ ḋ ḟ ġ ṁ ṗ ṡ ṫ''. Alternatively, lenition may be represented by a following letter ''h'', thus: ''bh ch dh fh gh mh ph sh th''. In Old Irish orthography, the dot was used only for ''ḟ ṡ'', while t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Punctum (gastropod)
''Punctum'' is a genus of very small air-breathing land snails, terrestrial pulmonate gastropod mollusks or micromollusks in the subfamily Punctinae of the family Punctidae, the dot snails. MolluscaBase eds. (2022). MolluscaBase. Punctum Morse, 1864. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=866756 on 2022-03-03 Distribution This genus is found throughout the Holarctic ecozone, and also in South Africa and Mexico. Species The genus ''Punctum'' includes the following species: The type species is ''Helix minutissima'' Lea, 1841 * '' Punctum abbadianum'' (Bourguignat, 1883) * '' Punctum adami'' Bruggen & Goethem, 2001 * † '' Punctum alveus'' Pierce, 1992 * '' Punctum amblygonum'' (Reinhardt, 1877) * '' Punctum apertum'' Pilsbry & Y. Hirase, 1904 * '' Punctum atomus'' Pilsbry & Hirase, 1904 * '' Punctum azoricum'' De Winter, 1988 [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sepsis Punctum
''Sepsis punctum'' is a European species of fly Flies are insects of the Order (biology), order Diptera, the name being derived from the Ancient Greek, Greek δι- ''di-'' "two", and πτερόν ''pteron'' "wing". Insects of this order use only a single pair of wings to fly, the hindwing ... and member of the family Sepsidae. References Sepsidae Diptera of Europe Taxa named by Johan Christian Fabricius Insects described in 1794 {{Sciomyzoidea-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blind Spot (vision)
A blind spot, scotoma, is an obscuration of the visual field. A particular blind spot known as the ''physiological blind spot'', "blind point", or ''punctum caecum'' in medical literature, is the place in the visual field that corresponds to the lack of light-detecting photoreceptor cells on the optic disc of the retina where the optic nerve passes through the optic disc.Gregory, R., & Cavanagh, P. (2011)"The Blind Spot" Scholarpedia. Retrieved on 2011-05-21. Because there are no cells to detect light on the optic disc, the corresponding part of the field of vision is invisible. Processes in the brain interpolate the blind spot based on surrounding detail and information from the other eye, so it is not normally perceived. Although all vertebrates have this blind spot, cephalopod eyes, which are only superficially similar, do not. In them, the optic nerve approaches the receptors from behind, so it does not create a break in the retina. The first documented observation of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phylloxiphia Punctum
''Phylloxiphia punctum'' is a moth of the family Sphingidae. It is known from savanna from north-eastern South Africa to Zimbabwe, Zambia, the Democratic Republic of the Congo and Tanzania. The length of the forewings is about 35 mm. Females are somewhat larger and have more rounded wings. The head and thorax are bright pinkish brown, but the abdomen is paler. The forewings are long and narrow, pinkish brown with a blackish dot near the apex and a reddish inner marginal basal streak. The hindwings are pinkish orange. References Punctum Punctum, plural puncta, adjective punctate, is an anatomical term for a sharp point or tip. It may also refer to: Medical *Lacrimal punctum, a minute opening on the margins of the eyelids that collect tears produced by the lacrimal glands *Blin ... Lepidoptera of the Democratic Republic of the Congo Lepidoptera of Namibia Lepidoptera of South Africa Lepidoptera of Tanzania Lepidoptera of Zambia Lepidoptera of Zimbabwe Moths of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cinguloterebra Punctum
''Terebra punctum'' is a species of sea snail, a marine gastropod mollusc in the family Terebridae The Terebridae, commonly referred to as auger shells or auger snails, is a group or family of small to large predatory marine gastropods in the superfamily Conoidea.Gofas, S. (2012). Terebridae. World Register of Marine Specie2012-10-12 These ga ..., the auger snails.MolluscaBase eds. (2020). MolluscaBase. Terebra punctum (Poppe, Tagaro & Terryn, 2009). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=1416754 on 2020-01-30 Description Distribution References * Poppe G.T., Tagaro S.P. & Terryn Y. (2009) ''New Terebridae from the Philippines''. Visaya 2(4): 57-62 External links Fedosov, A. E.; Malcolm, G.; Terryn, Y.; Gorson, J.; Modica, M. V.; Holford, M.; Puillandre, N. (2020). Phylogenetic classification of the family Terebridae (Neogastropoda: Conoidea). Journal of Molluscan Studies Terebridae Gastropods de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
