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Mark   Year Entries
Hydrogels -- analysis.   2016 1
Hydrogels -- chemistry.   3
Hydrogels -- pharmacology.   2
Hydrogels -- therapeutic use.   2
Hydrogen.   9
Hydrogen -- analysis.   3
 

Hydrogen Bombs -- See Nuclear Weapons


A weapon that derives its destructive force from nuclear fission and/or fusion.
  1
Hydrogen Bonding.   3
 

Hydrogen Bonds -- See Hydrogen Bonding


A low-energy attractive force between hydrogen and another element. It plays a major role in determining the properties of water, proteins, and other compounds.
  1
Hydrogen -- chemistry.   10
 

Hydrogen Chloride -- See Hydrochloric Acid


A strong corrosive acid that is commonly used as a laboratory reagent. It is formed by dissolving hydrogen chloride in water. GASTRIC ACID is the hydrochloric acid component of GASTRIC JUICE.
  1
Hydrogen Cyanide -- poisoning.   1976 1
Hydrogen Cyanide -- toxicity.   1990 1
 

Hydrogen Fluoride -- See Hydrofluoric Acid


Hydrofluoric acid. A solution of hydrogen fluoride in water. It is a colorless fuming liquid which can cause painful burns.
  1
Hydrogen-Ion Concentration.   6
Hydrogen-Ion Concentration -- programmed texts.   1964 1
 

Hydrogen Ions -- See Protons


Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.
  1
Hydrogen Peroxide.   2
 

Hydrogen Peroxide analogs & derivatives -- See Peroxides


A group of compounds that contain a bivalent O-O group, i.e., the oxygen atoms are univalent. They can either be inorganic or organic in nature. Such compounds release atomic (nascent) oxygen readily. Thus they are strong oxidizing agents and fire hazards when in contact with combustible materials, especially under high-temperature conditions. The chief industrial uses of peroxides are as oxidizing agents, bleaching agents, and initiators of polymerization. (From Hawley's Condensed Chemical Dictionary, 11th ed)
  1
Hydrogen Peroxide -- analysis.   2
Hydrogen Peroxide -- chemistry.   1994 1
Hydrogen Peroxide -- metabolism.   2
Hydrogen Peroxide -- therapeutic use.   2007 1
Hydrogen Sulfide.   3
Hydrogen Sulfide -- adverse effects.   1975 1
Hydrogen Sulfide -- analysis.   2013 1
Hydrogen Sulfide -- chemistry.   1976 1
Hydrogen Sulfide -- metabolism.   2007 1
Hydrogen Sulfide -- toxicity.   2
Hydrogenase -- analysis.   2003 1
Hydrogenation.   9
 

Hydrolase -- See Hydrolases


Any member of the class of enzymes that catalyze the cleavage of the substrate and the addition of water to the resulting molecules, e.g., ESTERASES, glycosidases (GLYCOSIDE HYDROLASES), lipases, NUCLEOTIDASES, peptidases (PEPTIDE HYDROLASES), and phosphatases (PHOSPHORIC MONOESTER HYDROLASES). EC 3.
  1
Hydrolases.   20
Hydrolases -- analysis.   2001 1
Hydrolases -- chemistry.   1980 1
 

Hydrology -- See Also Limnology


The study of the physical, chemical, hydrological, and biological aspects of fresh water bodies. (EPA Terms of Environment: Glossary, Abbreviations and Acronyms [Internet] US Environmental Protection Agency [cited 2008 Sep 25] available from http://www.epa.gov/OCEPAterms/aterms.html)
  1
Hydrology.   4
Hydrolysis.   19
Hydrolyzable Tannins -- analysis.   2
Hydrolyzable Tannins -- chemistry.   2009 1
 

Hydrophobia -- See Rabies


Acute VIRAL CNS INFECTION affecting mammals, including humans. It is caused by RABIES VIRUS and usually spread by contamination with virus-laden saliva of bites inflicted by rabid animals. Important animal vectors include the dog, cat, bat, fox, raccoon, skunk, and wolf.
  1
Hydrophobic and Hydrophilic Interactions.   4
 

Hydroplanes -- See Also the narrower term Planing hulls


  1
 

Hydrops -- See Edema


Abnormal fluid accumulation in TISSUES or body cavities. Most cases of edema are present under the SKIN in SUBCUTANEOUS TISSUE.
  1
Hydroquinones.   1968 1
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