rh
Học thuậtThân thiện
Definition
- Noun (Abbreviation):
- Releasing Hormone: Any of several hormones produced in the hypothalamus and transported to the anterior pituitary gland, where they stimulate the release of specific anterior pituitary hormones.
- Rhodium: A white, hard metallic element (symbol Rh) belonging to the platinum group, found in platinum ores and used in alloys with platinum.
- Rhesus factor: A blood group antigen present on red blood cells. People with this antigen are Rh-positive (Rh+); those without it are Rh-negative (Rh-). Incompatibility between Rh-negative and Rh-positive blood can cause medical complications.
Usage Examples
- As Releasing Hormone:
- Growth hormone-releasing hormone (GHRH) is a type of Rh that stimulates the pituitary.
- The Rh known as GnRH is crucial for regulating reproduction.
- As Rhodium:
- The catalytic converter contains a small amount of Rh.
- Rh is often alloyed with platinum to increase its hardness.
- As Rhesus factor:
- The mother's Rh negative status requires special monitoring during pregnancy.
- A patient received an Rh incompatible blood transfusion.
Advanced Usage
- In Medicine: The term is most commonly used in the context of blood typing and pregnancy. "Rh" is almost always followed by a positive (+) or negative (-) sign in this context.
- The prenatal test checks for Rh antibodies.
- In Chemistry/Industry: When referring to the element, "Rh" is its standard chemical symbol and is often used in technical contexts.
- The price of Rh fluctuates on the commodities market.
Variants and Related Words
- Rh factor (n): Full term for the Rhesus blood group antigen.
- Rh-positive (adj): Describing blood that contains the Rh antigen.
- Rh-negative (adj): Describing blood that lacks the Rh antigen.
- Rh disease (n): A condition in a newborn resulting from Rh incompatibility with the mother.
- Rhodium plating (n): A thin surface layer of rhodium applied to another metal, often for decoration or to prevent tarnishing.
Synonyms
- For Releasing Hormone: Hypophysiotropic hormone, hypothalamic hormone.
- For Rhodium: Element 45 (on the periodic table).
- For Rhesus factor: D antigen (specific name for the primary Rh antigen).
Notes on Usage
- Capitalization: "Rh" is always written with a capital 'R' and a lowercase 'h'.
- Context is Critical: The meaning of "Rh" is entirely dependent on the field (endocrinology, chemistry/industry, or medicine/hematology). It is rarely used in isolation without clarifying context (e.g., "Rh metal," "Rh status," "Rh hormone"). In everyday language, it most frequently refers to the Rhesus factor.
Noun
- any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones; each of these hormones causes the anterior pituitary to secrete a specific hormone
- a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
- a blood group antigen possessed by Rh-positive people; if an Rh-negative person receives a blood transfusion from an Rh-positive person it can result in hemolysis and anemia