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{{Getting Started}}


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<center>&mdash;From the [[Panchatantra|Panchatantra]] [http://www.britannica.com/EBchecked/topic/440899/Panchatantra (Indian literature)]</center>
<center>'''"The ink of the learned is equal in merit to the blood of the martyrs."'''</center>
<center>&mdash;Father Kristoforos, [http://www.randomhouse.com/catalog/display.pperl?isbn=9781400079322&view=rg ''Birds Without Wings''], by [http://www.contemporarywriters.com/authors/?p=auth2 Louis de Bernières (b. 1954)]</center> -->
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=== Draft of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
[[Image:Showy lady slipper.jpg|thumb|right|200px]]
There are tens of thousands of [[species]], [[cultivar]]s and varieties in the '''[[orchid]]''' family, the largest family of flowering plants.  The word ''orchid'' may refer to any of the botanical family Orchidaceae, or, more often among lay persons, any of thousands of [[flower]]s called "orchids".


Orchids have been cultivated for centuries.  They include rare and recent discoveries such as the tiny ''[[Tallong Midge Orchid|Genoplesium plumosum]]'', the large, showy orchids which are featured in bouquets and corsages, and 'food' orchids such as ''[[Vanilla]]''.  A few orchids have insignificant flowers but are grown for their [[leaf|foliage]].  Most orchids are [[epiphyte]] plants; they do not root in soil, and must gain all their water and nutrients from the air and rain. Orchids have evolved to make optimal use of these scarce resources. Some keep water in thickened, almost succulent stems, called pseudobulbs, others have highly porous roots covered by a spongy layer, that can absorb humidity from the air; other store water in thick leaves; and other terrestrial orchids in small root tubers. Some species go through long periods of rest when their [[metabolism]] is reduced, followed by a fast [[growth]], blooming when resources are abundant. Many species lose their leaves to avoid [[dehydration ]] during droughts, or while they are resting.
<font size=1>[[Orchid|['''more...''']]]</font>


=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
{{Image|Adipocyte.png|right|250px|}}
A major breakthrough in the study of appetite regulation came in 1994 when the molecular geneticist Jeffrey Friedman discovered the adiposity signal '''[[leptin]]'''.  By studies of an inbred line of obese mice, the ''ob/ob'' mice which were thought to lack a satiety signal, Friedman and colleagues found that 'ob' codes for a gene that coded for a novel peptide hormone, which they called ''leptin'', from the Greek ‘leptos’ meaning thin. Mice deficient in this gene are morbidly obese and this obesity can be reversed by giving the mice leptin.


The leptin receptor was found in 1995 and is a member of the [[cytokine]] receptor family.


Leptin is a signaling molecule secreted from [[adipocyte]] cells into the blood, and the plasma concentration of leptin is thus proportional to the total body fat mass. Leptin is transported into the brain from the blood, where it suppresses apetite by its effects on specific neurones in the brain that express leptin receptors; in particular on neurons of the [[arcuate nucleus]] and [[ventromedial nucleus]] of the [[hypothalamus]]. Leptin receptor mRNA is found primarily in the hypothalamic arcuate nucleus, ventromedial nuclei and dorsomedial hypothalamic nuclei, regions that are known to be involved in appetite control. <font size=1>[[Leptin|['''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>
</p>
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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

New Blog Post
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.

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Article counts

Citable (146)
Developed (1,128)
Developing (7,391)
Stubs (7,672)
(16,467 total)

Good prose is like a windowpane.
— George Orwell (1903–1950) Why I Write
       —add a quotation about knowledge or writing


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.