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Lasers, Excimer
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D054018 |
[Gas lasers with excited dimers (i.e., excimers) as the active medium. The most commonly used are rare gas monohalides (e.g., argon fluoride, xenon chloride). Their principal emission wavelengths are in the ultraviolet range and depend on the monohalide used (e.g., 193 nm for ArF, 308 nm for Xe Cl). These lasers are operated in pulsed and Q-switched modes and used in photoablative decomposition involving actual removal of tissue. (UMDNS, 2005)
] |
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Lasers, Gas
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D054020 |
[Lasers in which a gas lasing medium is stimulated to emit light by an electric current or high-frequency oscillator.
] |
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Lasers, Semiconductor
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D054023 |
[Lasers with a semiconductor diode as the active medium. Diode lasers transform electric energy to light using the same principle as a light-emitting diode (LED), but with internal reflection capability, thus forming a resonator where a stimulated light can reflect back and forth, allowing only a certain wavelength to be emitted. The emission of a given device is determined by the active compound used (e.g., gallium arsenide crystals doped with aluminum or indium). Typical wavelengths are 810, 1,060 and 1,300 nm. (From UMDNS, 2005)
] |
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Lasers, Solid-State
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D053844 |
[Lasers which use a solid, as opposed to a liquid or gas, as the lasing medium. Common materials used are crystals, such as YAG (YTTRIUM aluminum garnet); alexandrite; and CORUNDUM, doped with a rare earth element such as a NEODYMIUM; ERBIUM; or HOLMIUM. The output is sometimes additionally modified by addition of non-linear optical materials such as potassium titanyl phosphate crystal, which for example is used with neodymium YAG lasers to convert the output light to the visible range.
] |
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Lassa Fever
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D007835 |
[An acute febrile human disease caused by the LASSA VIRUS.
] |
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Lassa virus
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D007836 |
[A species of ARENAVIRUS, part of the Old World Arenaviruses (ARENAVIRUSES, OLD WORLD), and the etiologic agent of LASSA FEVER. LASSA VIRUS is a common infective agent in humans in West Africa. Its natural host is the multimammate mouse Mastomys natalensis.
] |
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Latanoprost
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D000077338 |
[A prostaglandin F analog used to treat OCULAR HYPERTENSION in patients with GLAUCOMA.
] |
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Late Onset Disorders
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D000067562 |
[Pathological conditions (Disorder, SYNDROME, or DISEASE) whose SIGNS AND SYMPTOMS manifest late in the life of an individual.
] |
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Latency Period, Psychological
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D007837 |
[The period from about 5 to 7 years to adolescence when there is an apparent cessation of psychosexual development.
] |
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Latent Autoimmune Diabetes in Adults
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D000071698 |
[Autoimmune diabetes in adults with slowly progressive PANCREATIC BETA CELL failure and the presence of circulating autoantibodies to PANCREATIC ISLETS cell antigens.
] |
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Latent Class Analysis
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D000077272 |
[A statistical algorithm used to analyze clusters of observed variables by constructing categorical unobserved or latent segment based on weighted analysis and the average probabilities. Such latent classes are used to infer variables whose relationships are not directly observed. In biomedical research, it is often used to categorize data that allows the determination of symptom clusters.
] |
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Latent Infection
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D000085343 |
[Delayed infection of the host by a dormant or inactive pathogen.
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Latent TGF-beta Binding Proteins
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D053779 |
[A family of secreted multidomain proteins that were originally identified by their association with the latent form of TRANSFORMING GROWTH FACTORS. They interact with a variety of EXTRACELLULAR MATRIX PROTEINS and may play a role in the regulation of TGB-beta bioavailability.
] |
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Latent Tuberculosis
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D055985 |
[The dormant form of TUBERCULOSIS where the person shows no obvious symptoms and no sign of the causative agent (Mycobacterium tuberculosis) in the SPUTUM despite being positive for tuberculosis infection skin test.
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Lateral Internal Sphincterotomy
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D000074722 |
[Surgical incision of the INTERNAL ANAL SPHINCTER typically in the treatment of FISSURE IN ANO; chronic ANAL FISSURE and FECAL INCONTINENCE.
] |
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Lateral Ligament, Ankle
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D017844 |
[LATERAL LIGAMENTS of the ANKLE JOINT. It includes inferior tibiofibular ligaments.
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Lateral Line System
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D053403 |
[Aquatic vertebrate sensory system in fish and amphibians. It is composed of sense organs (canal organs and pit organs) containing neuromasts (MECHANORECEPTORS) that detect water displacement caused by moving objects.
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Lateral Medullary Syndrome
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D014854 |
[INFARCTION of the dorsolateral aspect of MEDULLA OBLONGATA in the BRAIN STEM. It is caused by occlusion of the VERTEBRAL ARTERY and/or the posterior inferior cerebellar artery. Clinical manifestations vary with the size of infarction, but may include loss of pain and temperature sensation in the ipsilateral face and contralateral body below the chin; ipsilateral HORNER SYNDROME; ipsilateral ATAXIA; DYSARTHRIA; VERTIGO; nausea, hiccup; dysphagia; and VOCAL CORD PARALYSIS. (From Adams et al., Principles of Neurology, 6th ed, p801)
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Lateral Sinus Thrombosis
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D020227 |
[Formation or presence of a blood clot (THROMBUS) in the LATERAL SINUSES. This condition is often associated with ear infections (OTITIS MEDIA or MASTOIDITIS) without antibiotic treatment. In developed nations, lateral sinus thrombosis can result from CRANIOCEREBRAL TRAUMA; BRAIN NEOPLASMS; NEUROSURGICAL PROCEDURES; THROMBOPHILIA; and other conditions. Clinical features include HEADACHE; VERTIGO; and increased intracranial pressure.
] |
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Lateral Thalamic Nuclei
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D020647 |
[A narrow strip of cell groups on the dorsomedial surface of the thalamus. It includes the lateral dorsal nucleus, lateral posterior nucleus, and the PULVINAR.
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