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12 hours ago · Uranium. orthorhombic. Uranium is a chemical element; it has symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactively decays by emitting an alpha particle.
- Uranium Mining
2021 uranium mining by nation Schematic diagram of stages...
- Uranium Glass
Uranium glassware glowing under ultraviolet light Uranium...
- Uranium (Disambiguation)
Chemistry. Isotopes of uranium. Uranium-232; Uranium-233;...
- Uraninite
Uraninite, also known as pitchblende, is a radioactive,...
- Reproductive Toxicant
The international pictogram for chemicals that are...
- Isotopes of Uranium
Uranium (92 U) is a naturally occurring radioactive element...
- Valence Electrons
Four covalent bonds.Carbon has four valence electrons and...
- List of Countries by Uranium Reserves
World uranium reserves in 2010. Uranium reserves are...
- Uranium Mining
12 hours ago · Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs; Cherenkov radiation; and ...
12 hours ago · Bismuth is a chemical element; it has symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs naturally, and its sulfide and oxide forms are important commercial ores.
- lustrous brownish silver
- group 15 (pnictogens)
- 83
- Definition
- Classification
- Measurement
- Causes
- Mechanisms
- Prevalence
- Diagnosis
- Possible Purposes of Fatigue
- Further Reading
Fatigue in a medical context is used to cover experiences of low energy that are not caused by normal life. Distinguishing features of such fatigue include 1. not linking fatigue to an obvious cause, 2. lack of improvement with rest, 3. variability in severity, 4. unpredictability, and 5. fatigue being more profound/overwhelming, and having extensi...
By effect
Fatigue can have significant negative impacts on quality of life.Profound and debilitating fatigue is the most common complaint reported among individuals with autoimmune disease, such as systemic lupus erythematosus, multiple sclerosis, type 1 diabetes, celiac disease, chronic fatigue syndrome, and rheumatoid arthritis. Fatigue that dissociates by quantum with disease activity represents a large health economic burden and unmet need to patients and to society.
Fatigue is currently measured by many different self-measurement surveys. There is no consensus on best practice,and the existing surveys do not capture the intermittent nature of some forms of fatigue. Nintendo announced plans for a device to possibly quantitatively measure fatigue in 2014,but the project was stopped in 2016.
Undiagnosed
The cause of fatigue is often undiagnosed.
Idiopathic chronic fatigue
Idiopathic chronic fatigue is chronic fatigue not caused by a known proximate cause such as a discrete medical condition, drug or alcohol use.
Medications
Fatigue may be a side effect of certain medications (e.g., lithium salts, ciprofloxacin); beta blockers, which can induce exercise intolerance; and many cancer treatments, particularly chemotherapy and radiotherapy.
The mechanisms that cause fatigue are not well understood. Several mechanisms may be in operation within a patient,with the relative contribution of each mechanism differing over time.
2023 guidance stated fatigue prevalence is between 4.3% and 21.9%. Prevalence is higher in women than men. 2021 German study found that fatigue was the main or secondary reason for 10–20% of all consultations with a primary care physician.
The overall goal in diagnosis is to identify and rule out any treatable conditions. This is done by considering 1. the person's medical history, any other symptoms present. 2. evaluation of the qualities of the fatigue itself. Identifiable patterns to the fatigue can include being more tired at certain times of day, whether fatigue increases throug...
Evolutionary purposes
It has been posited that fatigue had evolutionary benefits in making more of the body's resources available for healing processes, such as immune responses, and in limiting disease spread by tending to reduce social interactions.
Body resource management purposes
Fatigue has been posited as a bio-psycho-physiological state reflecting the body's overall strategy in resource (energy) management. Fatigue may occur when the body wants to limit resource utilisation ("rationing") in order to conserve energy for a particular need, including a threat. This need may be a current or future anticipated need.
Byung-Chul Han: Müdigkeitsgesellschaft. Matthes & Seitz, Berlin 2010, ISBN 978-3-88221-616-5. (Philosophical essay about fatigue as a sociological problem and symptom).
- Exhaustion, weariness, tiredness, lethargy, listlessness
- Internal medicine and most other specialities