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Sella Turcica
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D012658 |
[A bony prominence situated on the upper surface of the body of the sphenoid bone. It houses the PITUITARY GLAND.
] |
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Semantic Differential
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D012659 |
[Analysis of word concepts by the association of polar adjectives, e.g., good-bad, with the concept, father. The adjectives are usually scaled in 7 steps. The subject's placement of the concept on the adjectival scale indicates the connotative meaning of the concept.
] |
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Semantic Web
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D000075403 |
[A framework for development and promotion of common data formats and exchange protocols linked in a way that can be read directly by computers. Semantic Web is a platform for sharing and reusing data across application, enterprise, and community boundaries, by linking concepts rather than just documents.
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Semantics
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D012660 |
[The relationships between symbols and their meanings.
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Semaphorin-3A
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D040121 |
[The prototypical and most well-studied member of the semaphorin family. Semaphorin-3A is an axon-repulsive guidance cue for migrating neurons in the developing nervous system. It has so far been found only in vertebrates, and binds to NEUROPILIN-1/plexin complex receptors on growth cones. Like other class 3 semaphorins, it is a secreted protein.
] |
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Semaphorins
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D039961 |
[Transmembrane proteins involved in axonal guidance of peripheral neurons in the developing CNS of invertebrates. Semaphorin-1 refers to the class of SEMAPHORINS with an extracellular sema domain and a short cytoplasmic domain. Sema-1 was first identified in grasshopper as fasciclin IV, and has since been described in Drosophila and C. elegans. Two distinct members of this class of semaphorins exist: SEMA-1a (the original sema-1) and SEMA-1b, a homologous protein isolated from Drosophila which may be more important for neuronal differentiation than migration.
, A family of proteins that mediate AXONAL GUIDANCE. Semaphorins act as repulsive cues for neuronal GROWTH CONES and bind to receptors on their filopodia. At least 20 different molecules have been described and divided into eight classes based on domain organization and species of origin. Classes 1 and 2 are invertebrate, classes 3-7 are vertebrate, and class V are viral. Semaphorins may be secreted (classes 2, 3, and V), transmembrane (classes 1, 4, 5, and 6), or membrane-anchored (class 7). All semaphorins possess a common 500-amino acid extracellular domain which is critical for receptor binding and specificity, and is also found in plexins and scatter factor receptors. Their C termini are class-specific and may contain additional sequence motifs.
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Semecarpus
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D031023 |
[A plant genus of the family ANACARDIACEAE that is the source of anacarcin forte. The nut milk extract is cytotoxic.
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Semen
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D012661 |
[The thick, yellowish-white, viscid fluid secretion of male reproductive organs discharged upon ejaculation. In addition to reproductive organ secretions, it contains SPERMATOZOA and their nutrient plasma.
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Semen Analysis
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D055101 |
[Measurable parameters of semen related to male fertility (e.g., SPERM COUNT; SPERM MOTILITY, volume, concentration, morphology, and viability).
, The quality of SEMEN, an indicator of male fertility, can be determined by semen volume, pH, sperm concentration (SPERM COUNT), total sperm number, sperm viability, sperm vigor (SPERM MOTILITY), normal sperm morphology, ACROSOME integrity, and the concentration of WHITE BLOOD CELLS.
] |
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Semen Preservation
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D012662 |
[The process by which semen is kept viable outside of the organism from which it was derived (i.e., kept from decay by means of a chemical agent, cooling, or a fluid substitute that mimics the natural state within the organism).
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Semiaquilegia
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D031948 |
[A plant genus of the family RANUNCULACEAE that contains griffonilide, lithospermoside, and magnoflorine.
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Semicarbazides
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D012663 |
[Derivatives of UREA where one of the amino groups is replaced with hydrazine.
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Semicarbazones
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D012664 |
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Semicircular Canal Dehiscence
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D000084322 |
[A vestibular disorder caused by a pathologic third window into the BONY LABYRINTH (in contrast to the normal ROUND WINDOW OF EAR and the OVAL WINDOW OF EAR). It can present with autophony, sound- or pressure-induced VERTIGO, and chronic disequilibrium among other vestibulocochlear symptoms.(From: Semin Neurol. 2020 Jan 27; 48: 58-65.)
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Semicircular Canals
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D012665 |
[Three long canals (anterior, posterior, and lateral) of the bony labyrinth. They are set at right angles to each other and are situated posterosuperior to the vestibule of the bony labyrinth (VESTIBULAR LABYRINTH). The semicircular canals have five openings into the vestibule with one shared by the anterior and the posterior canals. Within the canals are the SEMICIRCULAR DUCTS.
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Semicircular Ducts
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D054776 |
[The three membranous semicircular ducts within the bony semicircular canals. They open into the UTRICLE through five openings. Each duct has at one end a sensory area called the ampullary crest. AMPULLARY HAIR CELLS of the crests sense the movement of ENDOLYMPH resulting from rotation of the head.
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Semiconductors
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D012666 |
[Materials that have a limited and usually variable electrical conductivity. They are particularly useful for the production of solid-state electronic devices.
] |
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Seminal Plasma Proteins
|
D029589 |
[Proteins found in SEMEN. Major seminal plasma proteins are secretory proteins from the male sex accessory glands, such as the SEMINAL VESICLES and the PROSTATE. They include the seminal vesicle-specific antigen, an ejaculate clotting protein; and the PROSTATE-SPECIFIC ANTIGEN, a protease and an esterase.
] |
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Seminal Vesicle Secretory Proteins
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D029607 |
[The secretory proteins of the seminal vesicles are proteins and enzymes that are important in the rapid clotting of the ejaculate. The major clotting protein is seminal vesicle-specific antigen. Many of these seminal vesicle proteins are under androgen regulation, and are substrates for the prostatic enzymes, such as the PROSTATE-SPECIFIC ANTIGEN, a protease and an esterase.
] |
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Seminal Vesicles
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D012669 |
[A saclike, glandular diverticulum on each ductus deferens in male vertebrates. It is united with the excretory duct and serves for temporary storage of semen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
] |
