Rf (Noun)
Meaning 1
A substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland.
Classification
Nouns denoting substances.
Examples
- The hypothalamus produces a releasing factor that stimulates the anterior pituitary gland to secrete growth hormone.
- The releasing factor is a peptide hormone that is secreted by the hypothalamus and regulates the release of other hormones.
- The hypothalamus secretes a releasing factor that triggers the release of thyroid-stimulating hormone from the anterior pituitary gland.
- The releasing factor is a crucial component of the hypothalamic-pituitary axis, regulating the secretion of various hormones.
- The hypothalamus produces a releasing factor that stimulates the anterior pituitary gland to secrete adrenocorticotropic hormone.
Synonyms
Hypernyms
Hyponyms
Meaning 2
A radioactive transuranic element which has been synthesized.
Classification
Nouns denoting substances.
Examples
- Radiochemistry research facilities require specialized equipment to handle the highly toxic and radioactive element Rf.
- In the 1960s, scientists discovered the new element Rf by bombarding californium with oxygen ions.
- The atomic number of Rf, also known as rutherfordium, is 104, making it one of the heaviest elements known.
- Because Rf decays quickly into other elements, scientists must work rapidly to characterize its chemical properties.
- Due to the synthetic nature of Rf, there are no natural sources of this element, and all known quantities have been produced in laboratory experiments.
Synonyms
Hypernyms
Meaning 3
A complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone.
Classification
Nouns denoting body parts.