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<center>'''"The ink of the learned is equal in merit to the blood of the martyrs."'''</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.
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<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
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[[:Category:Citable versions of articles|Citable Articles]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
[[:Category:Developed Articles|Developed Articles]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
[[:Category:Developing Articles|Developing Articles]] <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 articles]])</small>
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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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<h3 style="margin-top:0; padding-top:0.6em; border-top:1px dotted #e0e0e0;">
<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>  
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<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Latest revision as of 19:28, 18 February 2024

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. Read more about who we are.


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Article counts

Citable Articles (145)
Developed Articles (1,149)
Developing Articles (8,224)
Stubs (8,058)
(17,697 total articles)

The first principle is that you must not fool yourself and you are the easiest person to fool.
Richard Feynman (1918–1988), American physicist
       —add a quotation about knowledge or writing

Featured Article: Napoleon

Napoleon (Napoleon Bonaparte or, after 1804, Napoleon I, Emperor of the French) was a world historic figure and dictator of France from 1799 to 1814. He was the greatest general of his age--perhaps any age, with a sure command of battlefield tactics and campaign strategies, As a civil leader he played a major role in the French Revolution, then ended it when he became dictator in 1799 and Emperor of France in 1804 He modernized the French military, fiscal, political legal and religious systems. He fought an unending series of wars against Britain with a complex, ever-changing coalition of European nations on both sides. Refusing to compromise after his immense defeat in Russia in 1812, he was overwhelmed by a coalition of enemies and abdicated in 1814. In 1815 he returned from exile, took control of France, built a new army, and in 100 days almost succeeded--but was defeated at Waterloo and exiled to a remote island. His image and memory are central to French national identity, but he is despised by the British and Russians and is a controversial figure in Germany and elsewhere in Europe.

The Trail of Napoleon - J.F. Horrabin - Map.jpg

Rise to Power

Once the Revolution had begun, so many of the aristocratic officers turned against the Revolutionary government, or were exiled or executed, that a vacuum of senior leadership resulted. Promotions came very quickly now, and loyalty to the Revolution was as important as technical skill; Napoleon had both. His demerits were overlooked as he was twice reinstated, promoted, and allowed to collect his back pay. Paris knew him as an intellectual soldier deeply involved in politics. His first test of military genius came at Toulon in 1793, where the British had seized this key port. Napoleon, an acting Lieutenant-Colonel, used his artillery to force the British to abandon the city. He was immediately promoted by the Jacobin radicals under Robespierre to brigadier-general, joining the ranks of several brilliant young generals. He played a major role in defending Paris itself from counter-revolutionaries, and became the operational planner for the Army of Italy and planned two successful attacks in April 1794. He married Josephine (Rose de Beauharnais) in 1796, after falling violently in love with the older aristocratic widow.[1]

Footnotes

  1. Englund pp 63-73, 91-2, 97-8