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=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
'''[[Phosphorus]]''' is a chemical [[element]] with the [[atomic number]] Z = 15. Unlike other elements in group VA of the [[periodic table]], phosphorus is never found as a pure element in nature, but only in combination with other elements.


It is present in all living organisms in the form of [[organophosphate]]s and as calcium phosphates such as [[hydroxyapatite]] (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>) and [[fluoroapatite]] (Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>F<sub>2</sub>), substances found in teeth and bones.  Many cell signaling cascades in living organisms operate by a series of phosphorylation events in which a phosphate group (PO<sub>4</sub>)<sup>2&minus;</sup> is either added to a protein by a [[kinase]] or removed from a protein by a [[phosphorylase]]. 


Both [[red phosphorus]] and [[tetraphosphorus trisulfide]] are used in common matches because they are easily ignited by heat.  However, the [[agriculture|agricultural industry]] is the largest user of phosphorus in the form of [[fertilizer]]s. The radioactive isotope <sup>32</sup>P is used to radiolabel compounds for scientific studies.  Phosphorus and arsenic share many chemical properties.


==== Production of elemental phosphorus ====
Calcium phosphate (phosphate rock), mostly mined in Florida and North Africa, can be heated to 1200-1500 Celsius with sand, which is mostly SiO<sub>2</sub>, and coke (impure carbon) to produce vaporized tetraphosphorus, P<sub>4</sub>, (mp. 44.2 C) which is subsequently condensed into a white power under water to prevent oxidation.  Even under water, [[white phosphorus]] is slowly converted to the more stable red phosphorus [[allotrope]] (mp. 597C).  Both the white and red allotropes of phosphorus are insoluble in water.<font size=1>[[Phosphorus|['''more...''']]]</font>




=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
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'''[[Dazed and Confused (Led Zeppelin song)|Dazed and Confused]]''' is a song rewritten and arranged by [[British Isles|British]] rock group [[Led Zeppelin]], based on an original composition by Jake Holmes, also titled "Dazed and Confused". Led Zeppelin's heavier and electric ''Dazed and Confused'' was considered so significantly different from the Holmes acoustic version that the [[American Society of Composers, Authors and Publishers]] (ASCAP) assigned the unique serial registration of 340128276<ref>[http://www.ascap.com ASCAP website]</ref> to its [[copyright]], lodged by the newly created music publisher Superhype Music in 1968. Led Zeppelin's ''Dazed and Confused'' has since been widely covered and was an early performance highlight for the group.
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<font size=1>[[Dazed and Confused (Led Zeppelin song)|['''more...''']]]</font>
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<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
<p style="line-height:15px; padding-left:20px;">
[[:Category:Citable versions of articles|Citable]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
[[:Category:Developed Articles|Developed]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
[[:Category:Developing Articles|Developing]] <font size=1>('''{{PAGESINCAT:Developing Articles}}''')</font><br />
[[:Category:Stub Articles|Stubs]] <font size=1>('''{{PAGESINCAT:Stub Articles}}''')</font><br />
<small>([[:Category:CZ Live|{{PAGESINCAT:CZ Live}} total]])</small>
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----<h3 style="margin-top:0; padding-top:0.6em; border-top:1px dotted #e0e0e0;">
<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>
</h3>
{{CZ:Featured article/Current}}
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<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Latest revision as of 08:47, 31 October 2024

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Why is Citizendium deleting articles?


Help Write Articles about our World

Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We regard information as a public good and welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive.

Citizendium Getting Started
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Article counts

Citable (146)
Developed (1,129)
Developing (7,398)
Stubs (7,675)
(16,478 total)

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Featured Article: Poverty

The Mathare Valley slum near Nairobi, Kenya, in 2009.

Poverty is deprivation based on lack of material resources. The concept is value-based and political. Hence its definition, causes and remedies (and the possibility of remedies) are highly contentious.[1] The word poverty may also be used figuratively to indicate a lack, instead of material goods or money, of any kind of quality, as in a poverty of imagination.

Definitions

Primary and secondary poverty

The use of the terms primary and secondary poverty dates back to Seebohm Rowntree, who conducted the second British survey to calculate the extent of poverty. This was carried out in York and was published in 1899. He defined primary poverty as having insufficient income to “obtain the minimum necessaries for the maintenance of merely physical efficiency”. In secondary poverty, the income “would be sufficient for the maintenance of merely physical efficiency were it not that some portion of it is absorbed by some other expenditure.” Even with these rigorous criteria he found that 9.9% of the population was in primary poverty and a further 17.9% in secondary.[2]

Absolute and comparative poverty

More recent definitions tend to use the terms absolute and comparative poverty. Absolute is in line with Rowntree's primary poverty, but comparative poverty is usually expressed in terms of ability to play a part in the society in which a person lives. Comparative poverty will thus vary from one country to another.[3] The difficulty of definition is illustrated by the fact that a recession can actually reduce "poverty".

Causes of poverty

The causes of poverty most often considered are:

  • Character defects
  • An established “culture of poverty”, with low expectations handed down from one generation to another
  • Unemployment
  • Irregular employment, and/or low pay
  • Position in the life cycle (see below) and household size
  • Disability
  • Structural inequality, both within countries and between countries. (R H Tawney: “What thoughtful rich people call the problem of poverty, thoughtful poor people call with equal justice a problem of riches”)[4]

As noted above, most of these, or the extent to which they can be, or should be changed, are matters of heated controversy.

Footnotes

  1. Alcock, P. Understanding poverty. Macmillan. 1997. ch 1.
  2. Harris, B. The origins of the British welfare state. Palgrave Macmillan. 2004. Also, Oxford Dictionary of National Biography.
  3. Alcock, Pt II
  4. Alcock, Preface to 1st edition and pt III.