|
Polar T3 Syndrome
Polar T3 syndrome is a condition found in polar explorers, caused by a decrease in levels of the thyroid hormone T3. Its effects include forgetfulness, cognitive impairment and mood disturbances. It can exhibit itself in a fugue state known as the ''Antarctic stare''. It is regarded as one of the contributory causes of winter-over syndrome The winter-over syndrome is a condition that occurs in individuals who "winter-over" throughout the Antarctic (or Arctic) winter, which can last seven to eight months. It has been observed in inhabitants of research stations in Antarctica, as we .... See also * Antarctica: A Year on Ice References Polar exploration Thyroid disease Syndromes {{endocrine-disease-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Explorer
This list is for recognised pioneering explorers of the polar regions. It does not include subsequent travelers and expeditions. Polar explorers * Jameson Adams * Stian Aker * Valerian Albanov * Roald Amundsen * Salomon August Andrée * Piotr Fyodorovich Anjou * Henryk Arctowski * Josée Auclair * Mikhail Babushkin * Konstantin Badygin * Karl Baer * Georgiy Baidukov * Ann Bancroft * Willem Barents * Michael Barne * Robert Bartlett * Nikifor Begichev * Fabian von Bellingshausen * Robert M. Berry * Edward W. Bingham * Olav Bjaaland * Alfred Björling * Carsten Borchgrevink * Jon Bowermaster * Henry Robertson Bowers * Louise Arner Boyd * Edward Bransfield * Philip Brocklehurst * William Speirs Bruce * Georgy Brusilov * Daniel Byles * Richard Evelyn Byrd * Todd Carmichael * Umberto Cagni * Jacques Cartier * Jean-Baptiste Charcot * Semion Chelyuskin * Apsley Cherry-Garrard * Vasili Chichagov * Valery Chkalov * Jeremy Clarkson * George Comer * Sebastian Copeland * Frede ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thyroid Hormone
File:Thyroid_system.svg, upright=1.5, The thyroid system of the thyroid hormones T3 and T4 rect 376 268 820 433 Thyroid-stimulating hormone rect 411 200 849 266 Thyrotropin-releasing hormone rect 297 168 502 200 Hypothalamus rect 66 216 386 256 Anterior pituitary gland rect 66 332 342 374 Negative feedback rect 308 436 510 475 Thyroid gland rect 256 539 563 635 Thyroid hormones rect 357 827 569 856 Catecholamine rect 399 716 591 750 Metabolism desc bottom-left Thyroid hormones are any hormones produced and released by the thyroid gland, namely triiodothyronine (T3) and thyroxine (T4). They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. T3 and T4 are partially composed of iodine. A deficiency of iodine leads to decreased production of T3 and T4, enlarges the thyroid tissue and will cause the disease known as simple goitre. The major form of thyroid hormone in the blood is thyroxine (T4), whose half-life of around one week ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triiodothyronine
Triiodothyronine, also known as T3, is a thyroid hormone. It affects almost every physiological process in the body, including growth and development, metabolism, body temperature, and heart rate. Production of T3 and its prohormone thyroxine (T4) is activated by thyroid-stimulating hormone (TSH), which is released from the anterior pituitary gland. This pathway is part of a closed-loop feedback process: Elevated concentrations of T3, and T4 in the blood plasma inhibit the production of TSH in the anterior pituitary gland. As concentrations of these hormones decrease, the anterior pituitary gland increases production of TSH, and by these processes, a feedback control system stabilizes the level of thyroid hormones in the bloodstream. T3 is the true hormone. Its effects on target tissues are roughly four times more potent than those of T4. Of the thyroid hormone that is produced, just about 20% is T3, whereas 80% is produced as T4. Roughly 85% of the circulating T3 is l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forgetfulness
Forgetting or disremembering is the apparent loss or modification of information already encoded and stored in an individual's short or long-term memory. It is a spontaneous or gradual process in which old memory, memories are unable to be recalled from memory storage. Problems with remembering, learning and retaining new information are a few of the most common complaints of older adults. Studies show that retention improves with increased rehearsal. This improvement occurs because rehearsal helps to transfer information into long-term memory. Forgetting curves (amount remembered as a function of time since an event was first experienced) have been extensively analyzed. The most recent evidence suggests that a power function provides the closest mathematical fit to the forgetting function. Overview Failing to retrieve an event does not mean that this specific event has been forever forgotten. Research has shown that there are a few health behaviors that to some extent can preve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cognitive Impairment
Cognitive deficit is an inclusive term to describe any characteristic that acts as a barrier to the cognition process. The term may describe * deficits in overall intelligence (as with intellectual disabilities), * specific and restricted deficits in cognitive abilities (such as in learning disorders like dyslexia), * neuropsychological deficits (such as in attention, working memory or executive function), * or it may describe drug-induced impairment in cognition and memory (such as that seen with alcohol, glucocorticoids, and the benzodiazepines.) Cause It usually refers to a durable characteristic, as opposed to altered level of consciousness, which may be acute and reversible. Cognitive deficits may be inborn or caused by environmental factors such as brain injuries, neurological disorders, or mental illness. Screening Screening for cognitive impairment in those over the age of 65 without symptoms is of unclear benefit versus harm as of 2020. In a large population-b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mood Disturbance
A mood disorder, also known as an affective disorder, is any of a group of conditions of mental and behavioral disorder where a disturbance in the person's mood is the main underlying feature. The classification is in the ''Diagnostic and Statistical Manual of Mental Disorders'' (DSM) and International Classification of Diseases (ICD). Mood disorders fall into seven groups, including; abnormally elevated mood, such as mania or hypomania; depressed mood, of which the best-known and most researched is major depressive disorder (MDD) (alternatively known as clinical depression, unipolar depression, or major depression); and moods which cycle between mania and depression, known as bipolar disorder (BD) (formerly known as manic depression). There are several sub-types of depressive disorders or psychiatric syndromes featuring less severe symptoms such as dysthymic disorder (similar to MDD, but longer lasting and more persistent, though often milder) and cyclothymic disorder (simil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fugue State
Dissociative fugue (), formerly called a fugue state or psychogenic fugue, is a mental and behavioral disorderDrs; that is classified variously as a dissociative disorder,Dissociative Fugue (formerly Psychogenic Fugue) 'DSM-IV 300.13, Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition'' a conversion disorder, and a somatic symptom disorder. The disorder is a rare psychiatric phenomenon characterized by reversible amnesia for one's identity, including the memories, personality, and other identifying characteristics of individuality. The state can last for days, months or longer. Dissociative fugue usually involves unplanned travel or wandering and is sometimes accompanied by the establishment of a new identity. It is a facet of dissociative amnesia, according to the fifth edition of the '' Diagnostic and Statistical Manual of Mental Disorders'' (DSM-5). After recovery from a fugue state, previous memories usually return intact, and further treatment is unn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter-over Syndrome
The winter-over syndrome is a condition that occurs in individuals who "winter-over" throughout the Antarctic (or Arctic) winter, which can last seven to eight months. It has been observed in inhabitants of research stations in Antarctica, as well as in polar bases such as Thule, Alert and Eureka. It consists of a variety of behavioral and medical disturbances, including irritability, depression, insomnia, absentmindedness, aggressive behavior, and irritable bowel syndrome. Contributing factors The Antarctic winter is a period of no physical contact with other continents or Antarctic stations, including no airplanes, ships, or mail. The area has the driest desert climate on Earth, and a low air pressure and oxygen-poor atmosphere. It is completely cut off during winter, the mean temperature is , and the lowest recorded temperature is . For these reasons, the immobility, monotony, harsh physical environment, sexual deprivation, and the general isolation, are believed to contr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A Year On Ice
A, or a, is the first letter and the first vowel letter of the Latin alphabet, used in the modern English alphabet, and others worldwide. Its name in English is '' a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version is often written in one of two forms: the double-storey and single-storey . The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English, '' a'' is the indefinite article, with the alternative form ''an''. Name In English, the name of the letter is the ''long A'' sound, pronounced . Its name in most other languages matches the letter's pronunciation in open syllables. History The earliest known ancestor of A is ''aleph''—the first letter of the Phoenician ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polar Exploration
Polar exploration is the process of exploration of the polar regions of Earth – the Arctic region and Antarctica – particularly with the goal of reaching the North Pole and South Pole, respectively. Historically, this was accomplished by explorers making often arduous travels on foot or by sled in these regions, known as a polar expedition. More recently, exploration has been accomplished with technology, particularly with satellite imagery. From 600 BC to 300 BC, Greek philosophers theorized that the planet was a Spherical Earth with North and South polar regions. By 150 AD, Ptolemy published ''Geographia'', which notes a hypothetical Terra Australis Incognita. However, due to harsh weather conditions, the poles themselves would not be reached for centuries after that. When they finally were reached, the achievement was realized only a few years apart. There are two claims, both disputed, about who was the first persons to reach the geographic North Pole. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thyroid Disease
Thyroid disease is a medical condition that affects the function of the thyroid gland. The thyroid gland is located at the front of the neck and produces thyroid hormones that travel through the blood to help regulate many other organs, meaning that it is an endocrine organ. These hormones normally act in the body to regulate energy use, infant development, and childhood development. There are five general types of thyroid disease, each with their own symptoms. A person may have one or several different types at the same time. The five groups are: # Hypothyroidism (low function) caused by not having enough free thyroid hormones # Hyperthyroidism (high function) caused by having too many free thyroid hormones # Structural abnormalities, most commonly a goiter (enlargement of the thyroid gland) # Tumors which can be benign (not cancerous) or cancerous # Abnormal thyroid function tests without any clinical symptoms (subclinical hypothyroidism or subclinical hyperthyroidism). In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
