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A trace radioisotope is a radioisotope that occurs naturally in trace amounts (i.e. extremely small). Generally speaking, trace radioisotopes have half-lives that are short in comparison with the age of the Earth, since primordial nuclides tend to occur in larger than trace amounts. Trace radioisotopes are therefore present only because they ...
A trace element is a chemical element of a minute quantity, a trace amount, especially used in referring to a micronutrient, [1] [2] but is also used to refer to minor elements in the composition of a rock, or other chemical substance. In nutrition, trace elements are classified into two groups: essential trace elements, and non-essential trace ...
Trace gases are gases that are present in small amounts within an environment such as a planet's atmosphere.Trace gases in Earth's atmosphere are gases other than nitrogen (78.1%), oxygen (20.9%), and argon (0.934%) which, in combination, make up 99.934% of its atmosphere (not including water vapor).
Helium-3 is present on Earth only in trace amounts. Most of it has been present since Earth's formation, though some falls to Earth trapped in cosmic dust. [114] Trace amounts are also produced by the beta decay of tritium. [115]
Lactaid, a brand of lactose-free dairy milk, has been recalled in 27 states by Massachusetts-based HP Hood LLC because the product may contain trace amounts of almonds that are not listed on the ...
Trace metals are the metals subset of trace elements; that is, metals normally present in small but measurable amounts in animal and plant cells and tissues. Some of these trace metals are a necessary part of nutrition and physiology. Some biometals are trace metals. Ingestion of, or exposure to, excessive quantities can be toxic.
Albuminuria is a pathological condition wherein the protein albumin is abnormally present in the urine (>30 mg per day). It is a type of proteinuria.Albumin is a major plasma protein (normally circulating in the blood); in healthy people, only trace amounts of it are present in urine, whereas larger amounts occur in the urine of patients with kidney disease.
These values imply, in solutions with neutral pH, no oxalic acid and only trace amounts of hydrogen oxalate exist. [3] The literature is often unclear on the distinction between H 2 C 2 O 4, HC 2 O − 4, and C 2 O 2− 4, and the collection of species is referred to as oxalic acid. [citation needed]