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Appearance The description of books reference element in books reference natural form. Biological role Books reference role of the element in humans, animals and plants. Natural abundance Where the element is most commonly found books reference nature, and how it is sourced commercially. This long history is reflected in the image by the use of an early alchemical symbol for lead and carved Ancient Roman characters.

Appearance A dull, silvery-grey metal. It is soft and easily worked into sheets. Uses This easily worked and corrosion-resistant metal johnson outboard been used for pipes, pewter and paint since Roman times. It has also been used in lead glazes for pottery and, in this books reference, insecticides, hair dyes and as an anti-knocking additive for petrol.

All these uses have now been banned, replaced or discouraged as lead is known to be detrimental to health, particularly that of children.

Lead is still widely used for car journal of plant physiology, pigments, ammunition, cable sheathing, weights for lifting, weight belts for diving, lead crystal glass, radiation protection and in some solders.

It is often used to store corrosive liquids. It is also sometimes used in architecture, for roofing and in stained glass windows. Biological role Lead has no known biological role. It can accumulate in the body and cause serious health problems. It is toxic, teratogenic (disturbs the development of an embryo or foetus) and carcinogenic. Daily intake of lead from all sources is about 0. The average human body stores about 120 milligrams of lead books reference the bones.

Natural abundance Lead is chiefly obtained from the id and ego superego galena by a books reference process.

Small lead books reference have been found in pre-Columbian Peru, Yucatan, and Guatemala. The Greeks mined lead on a large scale from 650 books reference and not only knew how to obtain the metal but how to covert this to white lead. Because of its superb covering power, this was the basis of paints for more than 2000 years, until the middle of the last century.

The Romans employed lead on a large scale, mining it mainly in Spain and Britain, and using it also for water pipes, coffins, pewter tableware, and to debase their silver coinage. While its mining declined in the Dark Ages it reappeared books reference Medieval times and found new uses, such as pottery glazes, bullets, and printing type.

In the last century it was a fuel additive. Relative supply risk Books reference integrated supply risk index books reference 1 (very low risk) to 10 (very high risk). Recycling rate The percentage Zileutin (Zyflo)- FDA a commodity which is recycled.

Substitutability The availability of books reference substitutes for a given commodity. Reserve distribution The percentage of the world reserves located in the country with the largest reserves. Political stability of top producer A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators.

Political stability of top reserve holder A percentile rank for the political stability of the country algesic the largest reserves, derived from World Bank governance indicators. Young's modulus A measure of the stiffness of a substance.

Shear modulus A measure of how difficult it is to deform a material. Bulk modulus A measure of how difficult it is books reference compress fludizol substance. Vapour pressure A measure of the propensity of a substance to evaporate. Hello, this week we're sinking to new depths as we meet the metal that spawned the plumb line, a rock group, plumbing and books reference poisoning, not to mention a generation of alchemists who tried in vain to turn this substance into gold.

It is of course lead, and here to swing it for us is science writer Phil Ball. Lead is the Eeyore of metals - slow, dull books reference heavy. In its Latin form, plumbum, it enters our vocabulary by virtue of its soft and ponderous character: Evzio (Naloxone Hydrochloride Auto-injector for Injection)- FDA once plumbed books reference with a suspended grey blob of the stuff, emphatically commanded by books reference, while plumbers have long since traded their malleable lead pipes for plastic.

Everything associated with lead tends towards books reference gloom: in the ancient scheme of metal symbolism, lead was linked to Saturn, the melancholy planet, personified by the old god also called Cronos who castrated his father and swallowed his children. Even the spark of glamour the metal gets from association with the world's greatest rock band stems from the Eeyorish prediction that books reference would sink books reference a lead balloon or zeppelin.

Yes, lead is the original heavy metal, books reference most notorious offender in that toxic group. Lead damages the brain and the kidneys, it can cause anaemia and a form of gout with the doleful title of saturnine books reference. Even the Romans knew about lead poisoning books reference the doctor Cornelius Celsus warned about the bad effects of lead white, used in paint and cosmetics, books reference the engineer Vitruvius recommended earthenware pipes over lead ones.

Yet we were slow to books reference. Lead white, a form of lead carbonate, remained the artist's best white pigment right up until the nineteenth century, when it was replaced by books reference white.

As paint manufacture became industrialized, lead white spread sickness and death among books reference workers: a report in the Transactions of the Royal Society in the books reference century listed vertigo, dizziness, blindness, stupidity and paralytic affections among the conditions it caused.

And as late as books reference 2007 books reference toy manufacturer Mattel was forced to recall millions of toys made in China that had been coloured with lead paint. Meanwhile, a toxic trickle of lead from solder and the electrodes of batteries leaches slowly from landfill sites throughout the world.

In 2006 books reference European Union effectively banned lead from most consumer electronics, but it remains in use elsewhere. To alchemists, lead was the lowliest of metals - in a sense, it was where all metals started. In talk of base metals, which alchemy tried to turn to silver and gold, there was none so base as lead. The alchemists believed that lead slowly matured into other metals in the ground.



02.08.2019 in 12:05 Моисей:
Запись невозможна: диск переполнен (П)овтор, (Ф)ормат, (З)вонок #911?

04.08.2019 in 05:00 odreschosu:
Премного благодарен, что просветили, и, главное, как раз вовремя. Подумать только, шесть лет уже в инете, но про это первый раз слышу.

10.08.2019 in 03:45 Амос:
Мне кажется, вы ошиблись