Crossword clues for precursor
precursor
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Precursor \Pre*cur"sor\, n. [L. praecursor, fr. praecurrere to run before; prae before + currere to run. See Course.] One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger.
Evil thoughts are the invisible, airy precursors of all
the storms and tempests of the soul.
--Buckminster.
Syn: Predecessor; forerunner; harbinger; messenger; omen; sign.
Douglas Harper's Etymology Dictionary
Wiktionary
n. That which precurse, a forerunner, a predecessor, an indicator of approaching events.
WordNet
n. a substance from which another substance is formed (especially by a metabolic reaction)
a person who goes before or announces the coming of another [syn: forerunner]
an indication of the approach of something or someone [syn: harbinger, forerunner, herald]
Wikipedia
Precursor or Precursors may refer to:
-
Precursor (religion), a forerunner, predecessor
- The Precursor, John the Baptist
In chemistry, a precursor is a compound that participates in a chemical reaction that produces another compound.
In biochemistry, the term "precursor" often refers more specifically to a chemical compound preceding another in a metabolic pathway, such as a protein precursor.
"Precursor" is a controversial prehistoric bird genus from the Early Eocene . It was established based on fossils found in England, e.g. in the famous London Clay deposits. Three species have been named, but the supposed "genus" seems to be a chimera composed from remains of different and quite unrelated Neornithes.
At least some of the remains seem to belong to a sort of psittaciform, of which today various parrots and cockatoos exist. Initially, it was even supposed that the fossils belonged to some family that is still extant. By now, it seems more likely however that the psittaciform material of the "Precursor" paratype belongs into the Pseudasturidae (of which Halcyornithidae may be the correct name). These were either basal in or immediately outside the Psittaciformes, and looked more like puffbirds in habitus though they were almost certainly not at all closely related to the latter. True parrots probably originated in the approximate region of Australia or perhaps neighboring Antarctica and did not reach Europe until less than 30 million years ago.
Unfortunately, it is unknown what the affiliations of the holotype material are. The fact that it was originally perceived to be something similar to a pratincole or courser suggests that the revised taxon Precursor may belong into the Charadriiformes. Certainly the Glareolidae are an ancient lineage, possibly originating more than 60 million years ago. If the "charadriimorph" remains are indeed Glareolidae, they should already be rather autapomorphic.
In religion, a precursor, also known as forerunner, predecessor, harbinger or herald, is a holy person who announced the approaching appearance of a prophet or who identified a prophet during the latter’s childhood.
Precursors are characteristic wave patterns caused by dispersion of an impulse's frequency components as it propagates through a medium. Classically, precursors precede the main signal, although in certain situations they may also follow it. Precursor phenomena exist for all types of waves, as their appearance is only predicated on the prominence of dispersion effects in a given mode of wave propagation. This non-specificity has been confirmed by the observation of precursor patterns in different types of electromagnetic radiation ( microwaves, visible light, and terahertz radiation) as well as in fluid surface waves and seismic waves.
Usage examples of "precursor".
Precursors of these future mind improvers are already being experimented with.
At that point they fly it into Colombia, where they refine it with ether and acetone, and some other precursor chemicals turn it into cocaine hydrochloride, the powder.
There are lots of neurotransmitter precursors in this shit, phenylalanine and glutamate.
Maybe the thoughts we generate today and flick around from mind to mind, like the jokes that turn up simultaneously at dinner parties in Hong Kong and Boston, or the sudden changes in the way we wear our hair, or all the popular love songs, are the primitive precursors of more complicated, polymerized structures that will come later, analogous to the prokaryotic cells that drifted through shallow pools in the early days of biological evolution.
With waves and tides and hot rocks and solar evaporation to concentrate the amino acids and proteinoids found in the seas and to turn them into the precursors of life, with lightning and heat and radiation and ultraviolet light to turn simple molecules into more complex ones, with the physics and chemistry of the universe itself to produce the necessary elements and simple compounds in appropriate amounts, it may even be said that life on Earth was inevitable, that it had to appear as soon as a microsphere was formed with just the right bit of nucleic acid within itself.
I was walking through the gate when Sweetie Pie stopped in front of me, her body rigid and a growl issuing from her throat that sounded like the precursor to a visit from Linda Blair in her younger days.
Even more perplexing were the facts that the Llano and Nenana complexes were contemporaneous and both seem to have appeared without precursors in very different parts of North America at almost exactly the same time.
Heirs of the Liberal Republicans and precursors of the Greenbackers and Populists, these independent parties were as voices crying in the wilderness, preparing the way for national parties of reform.
It would be an exaggeration to say that they were philo- rather than anti-Semites, and an anachronism to conceive of them as precursors of the modern interreligious spirit.
With waves and tides and hot rocks and solar evaporation to concentrate the amino acids and proteinoids found in the seas and to turn them into the precursors of life, with lightning and heat and radiation and ultraviolet light to turn simple molecules into more complex ones, with the physics and chemistry of the universe itself to produce the necessary elements and simple compounds in appropriate amounts, it may even be said that life on Earth was inevitable, that it had to appear as soon as a microsphere was formed with just the right bit of nucleic acid within itself.
They contain monounsaturated fats to keep your arteries clear, as well as levels years of precursors of serotonin to boost mood.
Angina pectoris could be the precursor to a full blown myocardial infarction.
At one point in the history of paleoanthropology, several scientists who believed in evolution actually accepted the Thenay Miocene tools, but attributed them to a precursor of the human type.
He has even imagined primitive carpenter shops and ovens and huts on these paths where the voyageurs must stop for repairs, food, and rest--the precursors of garage, road-house, and hotel.
The efficient cause thus referred to existed in the person of Samuel Hartlib, philanthropist and polypragmatist, precursor of the Franklins and Rumfords of the succeeding century.