Examples of half-life in the following topics:
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- A hormone's half-life and duration of activity are limited and vary from hormone to hormone.
- Vitamin D is a hormone that has a half-life of one to two months.
- A hormone's half-life and duration of activity are limited and vary from hormone to hormone.
- A biological half-life or elimination half-life is the time it takes for a substance such as a hormone or drug to lose half of its pharmacologic or physiologic activity.
- In a medical context, half-life may also describe the time it takes for the blood plasma concentration of a substance to halve (plasma half-life) its steady-state.
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- Its half-life in the body is about 1.5–2 hours.
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- Many physiologically-active materials are removed from the bloodstream (whether by metabolism or excretion) at a rate proportional to the current concentration so that they exhibit exponential decay with a characteristic half-life.
- Many East Asians (e.g. about half of Japanese) have impaired acetaldehyde dehydrogenase.
- Up to half a million people in the United States develop alcohol related liver cancer.
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- Proteins are composed of 20 different amino acids, about half of which are essential, meaning they must be obtained from the diet.
- This use of protein as a fuel is particularly important under starvation conditions as it allows the body's own proteins to be used to support life, particularly those found in muscle.
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- An excess of UV radiation can be life-threatening in extreme cases.
- Two photographs of a man wearing sunscreen (spf 50) on one half of his face, in visible light (left) and ultraviolet light (UV-A, 340-355nm) (right).
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- Furthermore, they are dangerous for the mother, since internal haemorrhage is a life threatening complication that may result.
- Sometimes the bleeding might be heavy enough to threaten the health or life of the woman.
- If left untreated, about half of ectopic pregnancies will resolve without treatment.
- However, in as many as one third to one half of ectopic pregnancies, no risk factors can be identified.
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- Some research has suggested breastfeeding decreases the risk in later life; various other nutritional risk factors are being studied, but no firm evidence has been found.
- Giving children 2000 IU of Vitamin D during their first year of life is associated with reduced risk of type 1 diabetes, though the causal relationship is obscure.
- Children with antibodies to beta cell proteins (i.e., at early stages of an immune reaction to them) but no overt diabetes, and treated with vitamin B3 (niacin), had less than half the diabetes onset incidence in a seven-year time span than did the general population, and an even lower incidence relative to those with antibodies as above, but who received no vitamin B3.
- This complication is very life-threatening; it makes ketoacidosis the most common cause of death in pediatric diabetes.
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- Primary, which is present from the time a male begins puberty, and secondary, which is acquired later in a man's life .
- Current evidence supports an average intravaginal ejaculation latency time (IELT) of six and a half minutes in 18 to 30 year olds.
- Primary, which is present from the time a male begins puberty, and secondary, which is acquired later in a man's life.
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- The head makes up nearly half of the fetus' size.
- The fetus is considered full-term between weeks 37 and 40, which means that the fetus is considered sufficiently developed for life outside the uterus.
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- All life forms require certain core elements as well as physical and chemical factors from the ecosystem
for biochemical functioning.
- Cells are the basic unit of life that can be found in every living organism.
- Beyond these zones are the "zones of intolerance," where life for that organism is impossible.
- These microorganisms are called extremophiles, and they thrive outside the ranges where life is commonly found.
- All life forms require certain core chemical elements for biochemical functioning.