AC

Pronunciation (US):

(GB):

IPA (US):

 Dictionary entry overview: What does AC mean? 

• AC (noun)
  The noun AC has 2 senses:

1. a radioactive element of the actinide series; found in uranium ores

2. an electric current that reverses direction sinusoidally

  Familiarity information: AC used as a noun is rare.

 Dictionary entry details 

• AC (noun)

Sense 1

Meaning:

A radioactive element of the actinide series; found in uranium ores

Classified under:

Nouns denoting substances

Synonyms:

Ac; actinium; atomic number 89

Hypernyms ("Ac" is a kind of...):

chemical element; element (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

Holonyms ("Ac" is a substance of...):

uranium ore (any ore from which uranium can be extracted)

Sense 2

Meaning:

An electric current that reverses direction sinusoidally

Classified under:

Nouns denoting natural phenomena

Synonyms:

AC; alternating current; alternating electric current

Context example:

In the US most household current is AC at 60 cycles per second

Hypernyms ("AC" is a kind of...):

electrical energy; electricity; power (energy made available by the flow of electric charge through a conductor)

 Context examples 

In contrast Gai-coupled receptors inhibit AC and so reduce cAMP formation.

(G-Protein Signaling Pathway, NCI Thesaurus/BIOCARTA)

A consensus protein secondary structure prediction server; http://barton.ebi.ac.uk/servers/jpred.html.

(JPred, NCI Thesaurus)

Non-small-cell lung cancer (NSCLC) accounts for approximately 80% of lung cancer and represents a heterogeneous group of cancers, consisting mainly of squamous cell (SCC), adeno (AC) and large-cell carcinoma.

(Non-Small Cell Lung Cancer Pathway, NCI Thesaurus/KEGG)

Receptors coupling to Gs stimulate AC, resulting in elevated cAMP levels and activation of Epac1.

(Phospholipase C-Epsilon Signaling Pathway, NCI Thesaurus/BIOCARTA)

In contrast, binding of Pg to mPR leads to inhibition of adenylyl cyclase (AC) through activation of Gai or inhibition of Gas.

(Oocyte Maturation Pathway, NCI Thesaurus/BIOCARTA)

CDK2/TRKA inhibitor PHA-848125 AC potently inhibits cyclin-dependent kinase 2 (CDK2) and exhibits activity against other CDKs including CDK1 and CDK4, in addition to TRKA.

(CDK2/TRKA Inhibitor PHA-848125 AC, NCI Thesaurus)

A device that experienced problems due to insufficient or excessive resistance to AC current flow either by the device or circuit.

(Device Impedance Problem Evaluation Result, Food and Drug Administration)

In particular, going without AC during a heat wave hurt their reaction time when they had to make quick judgments.

(Hot Dorm Rooms Could Affect Students' Memory, Sadie Witkowski/VOA)

Odorant molecules bind to a receptor protein (R) coupled to an olfactory specific Gs-protein (G) and activate a type III adenylyl cyclase (AC), increasing intracellular cAMP levels. cAMP targets an olfactory-specific cyclic-nucleotide gated ion channel (CNG), allowing cations, particularly Na and Ca, to flow down their electrochemical gradients into the cell, depolarizing the ORN.

(Olfactory Transduction Pathway, NCI Thesaurus/KEGG)

Also called AC regimen.

(AC, NCI Dictionary)