Search on: HYDROGEN 
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Descriptor English:   Hydrogen 
Descriptor Spanish:   Hidrógeno 
Descriptor Portuguese:   Hidrogênio 
Synonyms English:   Hydrogen 1
Hydrogen-1  
Tree Number:   D01.268.406
D01.362.340
SP4.011.097.063.904
Definition English:   The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM. 
Indexing Annotation English:   H or H1; H2 or 2H (superscript) = DEUTERIUM; H2 (subscript) = HYDROGEN; H3 or 3H = TRITIUM; production of H ions = probably PH
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AG agonists AN analysis
BL blood CF cerebrospinal fluid
CH chemistry CL classification
DF deficiency EC economics
HI history IM immunology
IP isolation & purification ME metabolism
PK pharmacokinetics PD pharmacology
PH physiology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   7012 
Unique Identifier:   D006859 

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