See pulse.
A type of racemose inflorescence in which stalkless flowers arise from an undivided floral axis, as in plantain and Orchis. In the family Gramineae (Poaceae; sedges and grasses) the flowers are grouped in clusters called spikelets (see illustration), which may be arranged to form a compound spike (as in wheat). See glume; lemma.
Spike: structure of a spikelet
A solution (liquid or gaseous) containing a known concentration of a particular element whose isotopic concentration has been changed by the enrichment of one of its naturally occurring isotopes. The spike is used in isotope dilution analysis, being mixed in known proportions with the sample solution, prior to isotopic determination by means of a mass spectrometer (see mass spectrometry).
- quantum gravitation
- quantum gravity
- quantum group
- quantum Hall effect
- quantum Hall ferromagnet
- quantum heterostructure
- quantum hypothesis((in neurophysiology))
- quantum information theory
- quantum interferometry
- quantum jump
- quantum key distribution
- quantum logic
- quantum mechanics
- quantum metrology
- quantum number
- quantum numbers
- quantum optics
- quantum phase transition
- quantum resistance metrology
- quantum simulation
- quantum spin liquid
- quantum state
- quantum statistics
- quantum teleportation
- quantum theory