Search on: HELIUM 
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Descriptor English:   Helium 
Descriptor Spanish:   Helio 
Descriptor Portuguese:   Hélio 
Synonyms English:   Helium 4
Helium-4  
Tree Number:   D01.268.613.350
D01.362.641.352
Definition English:   A noble gas with the atomic symbol He, atomic number 2, and atomic weight 4.003. It is a colorless, odorless, tasteless gas that is not combustible and does not support combustion. It was first detected in the sun and is now obtained from natural gas. Medically it is used as a diluent for other gases, being especially useful with oxygen in the treatment of certain cases of respiratory obstruction, and as a vehicle for general anesthetics. 
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:   6520 
Unique Identifier:   D006371 

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