Lead is a chemical element in the carbon group with symbol Pb (from Latin: plumbum) and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed to air. Lead has a shiny chrome-silver luster when it is melted into a liquid.
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Some articles on lead:
... In the human body, lead inhibits porphobilinogen synthase and ferrochelatase, preventing both porphobilinogen formation and the incorporation of iron into protoporphyrin IX, the final step in heme ... Acute lead poisoning is treated using disodium calcium edetate the calcium chelate of the disodium salt of ethylene-diamine-tetracetic acid (EDTA) ... This chelating agent has a greater affinity for lead than for calcium and so the lead chelate is formed by exchange ...
... The Lead has to communicate the direction of the movement to the Follow ... Traditionally, the Lead's right hand on the follow's back, near the lowest part of the shoulder-blade ... This is the strongest part of the back and the lead can easily pull the Follow's body inwards ...
... a non-toxic lightfast substitute for lemon yellow pigments such as the cadmium sulfides and the lead/strontium/barium chromates ... Unlike lead chromate+lead sulfate lemon, bismuth vanadate does not readily blacken with UV exposure ...
... By 1795 the former Templar mills were being used for preparing lead ... Sheets of lead were placed in clay pots and submerged in urine, then heated by decaying cow dung ... The process converted the lead to lead oxide, and it was then finely ground to form a pigment for white, yellow and red lead paint ...
... The Beatles John Lennon – lead, harmony and backing vocals, rhythm and acoustic guitars, piano, harmonica, tambourine, handclaps 12-string lead ...
More definitions of "lead":
- (noun): (baseball) the position taken by a base runner preparing to advance to the next base.
Example: "He took a long lead off first"
- (noun): The introductory section of a story.
Example: "It was an amusing lead-in to a very serious matter"
- (noun): Restraint consisting of a rope (or light chain) used to restrain an animal.
Synonyms: leash, tether
- (verb): Be in charge of.
- (noun): A soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull gray.
Example: "The children were playing with lead soldiers"
Synonyms: Pb, atomic number 82
- (noun): Evidence pointing to a possible solution.
Example: "The police are following a promising lead"
Synonyms: track, trail
- (noun): The angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile).
- (verb): Travel in front of; go in advance of others.
- (verb): Take somebody somewhere.
Example: "We lead him to our chief"
Synonyms: take, direct, conduct, guide
- (noun): The playing of a card to start a trick in bridge.
Example: "The lead was in the dummy"
- (noun): The timing of ignition relative to the position of the piston in an internal-combustion engine.
Synonyms: spark advance
- (noun): An advantage held by a competitor in a race.
Example: "He took the lead at the last turn"
- (verb): Move ahead (of others) in time or space.
- (noun): An indication of potential opportunity.
Example: "A good lead for a job"
Synonyms: tip, steer, confidential information, wind, hint
- (verb): Stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point.
Synonyms: run, go, pass, extend
- (verb): Cause something to pass or lead somewhere.
- (verb): Lead, extend, or afford access.
- (verb): Be ahead of others; be the first.
- (verb): Be conducive to.
Example: "The use of computers in the classroom lead to better writing"
Synonyms: contribute, conduce
- (noun): Thin strip of metal used to separate lines of type in printing.
- (noun): A position of leadership (especially in the phrase 'take the lead').
Example: "He takes the lead in any group"; "we were just waiting for someone to take the lead"; "they didn't follow our lead"
- (verb): Tend to or result in.
Example: "This remark lead to further arguments among the guests"
- (noun): Mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil.
Synonyms: pencil lead
- (verb): Pass or spend.
Example: "Lead a good life"
- (noun): A news story of major importance.
Synonyms: lead story
- (verb): Cause to undertake a certain action.
Example: "Her greed led her to forge the checks"
Famous quotes containing the word lead:
“Once lead this people into war and they will forget there ever was such a thing as tolerance.”
—Woodrow Wilson (18561924)
“None can lead this life who are not almost amphibious.”
—Henry David Thoreau (18171862)
“Methods of thought which claim to give the lead to our world in the name of revolution have become, in reality, ideologies of consent and not of rebellion.”
—Albert Camus (19131960)