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Learn about the definition, measurement, and sources of total dissolved solids (TDS) in water. TDS is a measure of the dissolved content of inorganic and organic substances in water, and affects its quality, taste, and use.
Learn the meaning and usage of various abbreviations in medical prescriptions, including Latin, Greek, and English terms. QD means "quaque die", meaning once daily, and is often used with a number to indicate the frequency of dosage.
Learn the meaning and origin of common medical abbreviations in Latin, such as a.m. (morning), p.o. (by mouth), and q.d. (every day). See the full list of abbreviations and their usage in prescriptions and other contexts.
This web page does not contain any information about naeon, a hypothetical element with the symbol N. It is a comprehensive list of medical abbreviations, acronyms, and initialisms, with definitions and examples.
Clinical chemistry is a medical laboratory science that tests compounds in bodily fluids and tissues using analytical techniques and instruments. It helps diagnose diseases, monitor treatments, and assess organ functions. Learn about common analytes, panel tests, and specimen processing.
Transdermal is a route of administration wherein active ingredients are delivered across the skin for systemic distribution. Learn about the obstacles, pathways, devices and formulations of transdermal delivery, as well as some examples of transdermal patches and gels.
TDS is a pejorative term for criticism or negative reactions to former US president Trump that are perceived to be irrational and biased. The term has been used by Trump supporters and opponents, and has different definitions and meanings depending on the context.
Learn about the definition, types, production and use of certified reference materials (CRMs), which are standards for checking the quality and traceability of products and measurements. Find out the terminology, criteria and examples of CRMs in different fields and applications.