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		<title>Por falar em partenogénese</title>
		<link>http://anatoxina.wordpress.com/2012/01/04/por-falar-em-partenogenese/</link>
		<comments>http://anatoxina.wordpress.com/2012/01/04/por-falar-em-partenogenese/#comments</comments>
		<pubDate>Wed, 04 Jan 2012 19:16:38 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[BG 11]]></category>
		<category><![CDATA[Desafios]]></category>
		<category><![CDATA[Ambiente]]></category>
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		<description><![CDATA[É um inglês muito fácil de entender. Daphnia are small, planktonic crustaceans, between 0.2 and 5 mm in length. Daphnia are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=624&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><a href="http://anatoxina.files.wordpress.com/2012/01/525px-daphnia_pulex2.png"><img class="aligncenter size-medium wp-image-663" title="Daphnia" src="http://anatoxina.files.wordpress.com/2012/01/525px-daphnia_pulex2.png?w=262&#038;h=300" alt="" width="262" height="300" /></a></p>
<p>É um inglês muito fácil de entender.</p>
<p><em>Daphnia</em> are small, planktonic crustaceans, between 0.2 and 5 mm in length. <em>Daphnia</em> are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style (although fleas are insects and thus only very distantly related). They live in various aquatic environments ranging from acidic swamps to freshwater lakes, ponds, streams and rivers.</p>
<p><em>Daphnia</em> reproduce <strong>parthenogenetically</strong> usually in the spring until the end of the summer. One or more juvenile animals are nurtured in the brood pouch inside the carapace. The newly hatched Daphnia must molt several times before they are fully grown into an adult usually after about two weeks. The young are small copies of the adult; there are no true nymphal or instar stages. The fully mature females are able to produce a new brood of young about every ten days under ideal conditions. The reproduction process continues while the environmental conditions continue to support their growth.</p>
<p>When winter approaches or in drought conditions or at times of other harsh environmental conditions, production of new female generations cease and parthenogenic males are produced. However, even in harsh environmental conditions males may make up considerably less than half the population, in some species they are unknown entirely. (&#8230;)   The fertilized eggs are termed winter eggs. The extra layer preserves and protects the egg inside from harsh environmental conditions until the more favourable times, such as spring, when the reproductive cycle is able to take place once again.   In addition to the production of eggs capable of overwintering, this switch to sexual reproduction has also been proposed to allow greater offspring variation (through <strong>genetic recombination</strong>) which may be useful in varied or unpredictable conditions, this idea is often proposed under the name of the lottery model.</p>
<p style="text-align:right;">adaptado livremente de en.wikipedia.org</p>
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		<title>Sistema solar, planetas telúricos e um asteróide chamado Lutetia</title>
		<link>http://anatoxina.wordpress.com/2011/11/17/sistema-solar/</link>
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		<pubDate>Thu, 17 Nov 2011 13:38:44 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[BG 10]]></category>
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		<description><![CDATA[Astrónomos do Observatório Europeu do Sul (ESO) descobriram que o asteróide Lutetia é um fragmento que sobrou do material original a partir do qual se formaram a Terra, Vénus e Mercúrio. Com a combinação de dados da sonda Rosetta, da Agência Espacial Europeia, do New Technology Telescope, da ESO, e telescópios da NASA, os cientistas [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=610&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Astrónomos do Observatório Europeu do Sul (ESO) descobriram que o <strong>asteróide</strong> Lutetia é um fragmento que sobrou do material original a partir do qual se formaram a Terra, Vénus e Mercúrio. Com a combinação de dados da sonda Rosetta, da Agência Espacial Europeia, do New Technology Telescope, da ESO, e telescópios da NASA, os cientistas descobriram que as propriedades do asteróide assemelhavam-se às de um tipo raro de meteorito encontrado na Terra, que se pensa ter sido formado nas regiões interiores do Sistema Solar.</p>
<p>Este facto sugere que a rocha se terá formado numa zona mais interna do Sistema Solar. Em determinado momento, a sua órbita mudou-o para a <strong>Cintura de Asteróides</strong>, entre Marte e Júpiter, onde ainda se encontra.</p>
<p>Astrónomos de universidades francesas e norte-americanas estudaram este invulgar asteróide detalhadamente, num grande intervalo de comprimentos de onda, com o intuito de determinar a sua composição.</p>
<p>O espectro foi comparado com o de <strong>meteoritos</strong> encontrados na Terra e que têm sido estudados extensivamente em laboratório. Apenas um tipo de meteorito – <strong>condritos</strong> do tipo E – apresenta propriedades semelhantes a Lutetia em todos os comprimentos de onda estudados.</p>
<p>Estes meteoritos são conhecidos por conterem material que data dos primórdios do Sistema Solar. Pensa-se que se tenham formado perto do Sol ainda jovem e que tenham constituído o principal material de construção dos <strong>planetas rochosos</strong>.</p>
<p>O autor do estudo, esclarece que dos corpos situados na região onde a Terra se formou, apenas menos de dois por cento chegaram à cintura de asteróides principal. A maioria dos corpos desapareceu depois de alguns milhões de anos, incorporados nos jovens planetas em formação. No entanto, alguns do maiores, com diâmetros de 100 quilómetros ou mais, foram lançados para órbitas mais seguras, mais longe do Sol.</p>
<p>Lutetia, que tem 100 quilómetros, pode ter sido ejetado para fora das regiões interiores do Sistema Solar, devido à proximidade de um dos planetas rochosos, capazes de alterar drasticamente a sua órbita. Um encontro com o jovem Júpiter durante a sua migração para a atual <strong>órbita</strong>, pode justificar igualmente a grande variação de órbita de Lutetia.</p>
<p style="text-align:right;">fonte: cienciahoje.pt</p>
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		<title>A probabilidade de existires</title>
		<link>http://anatoxina.wordpress.com/2011/11/12/a-probabilidade-de-existires/</link>
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		<pubDate>Sat, 12 Nov 2011 20:53:22 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
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		<title>Secreção celular</title>
		<link>http://anatoxina.wordpress.com/2011/11/06/secrecao-celular/</link>
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		<pubDate>Sun, 06 Nov 2011 17:48:04 +0000</pubDate>
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				<category><![CDATA[Biologia]]></category>
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		<title>Boa semana</title>
		<link>http://anatoxina.wordpress.com/2011/10/24/boa-semana/</link>
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		<pubDate>Mon, 24 Oct 2011 12:49:15 +0000</pubDate>
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		<title>Águas aromatizadas contêm antioxidantes benéficos</title>
		<link>http://anatoxina.wordpress.com/2011/10/13/aguas-aromatizadas-contem-antioxidantes-beneficos/</link>
		<comments>http://anatoxina.wordpress.com/2011/10/13/aguas-aromatizadas-contem-antioxidantes-beneficos/#comments</comments>
		<pubDate>Thu, 13 Oct 2011 19:44:43 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[Blog]]></category>
		<category><![CDATA[Saúde e Higiene]]></category>
		<category><![CDATA[Curiosidades]]></category>
		<category><![CDATA[Saúde]]></category>

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		<description><![CDATA[Com este estudo é que eu não contava. &#160; Um estudo desenvolvido no Instituto Superior de Engenharia do Porto (ISEP) conclui que as águas aromatizadas contêm antioxidantes benéficos para a saúde. O trabalho de Maria de Fátima Barroso, investigadora do Grupo de Reacção e Análises Química (GRAQ) do Laboratório Associado REQUIMTE, incidiu na comparação de [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=590&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Com este estudo é que eu não contava.</p>
<p> <img src='http://s1.wp.com/wp-includes/images/smilies/icon_wink.gif' alt=';)' class='wp-smiley' /> </p>
<p>&nbsp;</p>
<p>Um estudo desenvolvido no Instituto Superior de Engenharia do Porto (ISEP) conclui que as águas aromatizadas contêm antioxidantes benéficos para a saúde. O trabalho de Maria de Fátima Barroso, investigadora do Grupo de Reacção e Análises Química (GRAQ) do Laboratório Associado REQUIMTE, incidiu na comparação de 40 amostras de águas com diferentes sabores e de dez marcas distintas, com as respetivas águas minerais sem sabor.</p>
<p>Para além de comprovar a presença de antioxidantes, a investigação permitiu concluir, que estas águas são &#8221;excelente alternativa para aqueles que têm resistência em beber água mineral porque são também baixas em calorias e açúcares&#8221;.</p>
<p><strong>Nota</strong>: Os antioxidantes são conhecidos como substâncias benéficas para o organismo. São fundamentais para combater os radicais livres (agentes agressivos provenientes do metabolismo humano e do meio ambiente), que ameaçam o nosso equilíbrio e bem-estar. Apesar de o corpo humano produzir antioxidantes, pode não ser em quantidade suficiente para se defender das agressões externas. Daí a importância de incluirmos produtos antioxidantes na nossa dieta.</p>
<p>&nbsp;</p>
<p style="text-align:right;">fonte: www.cienciahoje.pt</p>
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		<title>Polvo gigante mandou nos mares há 200 milhões de anos</title>
		<link>http://anatoxina.wordpress.com/2011/10/13/polvo-gigante-mandou-nos-mares-ha-200-milhoes-de-anos/</link>
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		<pubDate>Thu, 13 Oct 2011 19:36:39 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[Geologia]]></category>
		<category><![CDATA[Paleontologia]]></category>

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		<description><![CDATA[Através do estudo das marcas encontradas em ossos de nove ictiossauros (Shonisaurus popularis) com 15 metros de comprimento, que viveram durante o Triásico (há mais de 200 milhões de anos), um grupo de investigadores norte-americanos diz ter bases para confirmar a existência de um gigante ser marinho, provavelmente um grande polvo ou uma lula, idêntico [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=586&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Através do estudo das marcas encontradas em ossos de nove ictiossauros (<em>Shonisaurus popularis</em>) com 15 metros de comprimento, que viveram durante o Triásico (há mais de 200 milhões de anos), um grupo de investigadores norte-americanos diz ter bases para confirmar a existência de um gigante ser marinho, provavelmente um grande polvo ou uma lula, idêntico ao mitológico kraken, o monstro da mitologia nórdica.</p>
<p>Este animal, capaz de matar e alimentar-se dos maiores predadores da sua época não deixou evidências directas da sua existência, pois o seu corpo decompunha-se rapidamente após a morte, impedindo o processo de fossilização.</p>
<p>Um grupo de investigadores liderado por Mark McMenamin, do Mount Holyoke College (Massachussets), estudou durante vários anos a morte de nove répteis marinhos encontrados no Parque Estatal Berlin-Ichthyosaur, no Nevada (EUA), onde se encontram preservados os fósseis.</p>
<p>Até agora, a explicação para a morte desses animais seria o aparecimento de um tipo de plâncton tóxico. Mas estes paleontólogos têm uma visão diferente.</p>
<p>Aquando da descoberta dos ossos, McMenamin ficou surpreendido pela sua disposição, que sugeria que nem todos tinham morrido ao mesmo tempo. Tudo indica que os restos tenham sido colocados nessa posição com um propósito concreto, que lembra o que fazem os polvos actuais com as suas presas quando as levam para as “tocas”.</p>
<p>As marcas nos ossos dos ictiossauros sugerem que uma criatura parecida com um polvo ou uma lula gigante sufocou os animais, partindo-lhes o pescoço. Além disso, as vértebras mostram marcas que remetem para a forma das ventosas do tentáculo de um cefalópode. O Berlin-Ichthyosaur State Park será, segundo os investigadores, o covil do <em>kraken</em> que os matou.</p>
<p style="text-align:right;">fonte: www.cienciahoje.pt</p>
<p style="text-align:right;">
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		<title>Erupção vulcânica: Ilha de El Hierro em alerta amarelo</title>
		<link>http://anatoxina.wordpress.com/2011/10/11/erupcao-vulcanica-ilha-de-el-hierro-em-alerta-amarelo/</link>
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		<pubDate>Tue, 11 Oct 2011 11:24:44 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[Blog]]></category>
		<category><![CDATA[Geologia]]></category>
		<category><![CDATA[Vulcanologia]]></category>

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		<description><![CDATA[Os serviços de observação sísmica registaram uma erupção vulcânica submarina a mil metros de profundidade debaixo de água, a ocorrer ao largo da ilha canária El Hierro, em Espanha, segundo avançou o diário espanhol «El Mundo». Investigadores espanhóis detectaram uma alteração no tipo de ondas, o que poderia significar que no fundo do mar se [...]<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=581&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p>Os serviços de observação sísmica registaram uma erupção vulcânica submarina a mil metros de profundidade debaixo de água, a ocorrer ao largo da ilha canária El Hierro, em Espanha, segundo avançou o diário espanhol «El Mundo». Investigadores espanhóis detectaram uma alteração no tipo de ondas, o que poderia significar que no fundo do mar se estão a produzir emissões de gases e lava.</p>
<p>&nbsp;</p>
<p>Recorde-se que a erupção tem lugar dois dias após se ter registado um sismo de 4,3 graus na escala de Richter. Os especialistas avançaram ainda que o fenómeno levou a uma alteração súbita no processo sísmico, já que acabou por paralisar a trepidação que se sentia há semanas na ilha canária.</p>
<p>No entanto, Teresa Ferreira, investigadora da Universidade dos Açores, considerou hoje &#8220;pouco provável&#8221; a observação à superfície de fenómenos associados à erupção vulcânica submarina.</p>
<p>&#8220;Tendo em conta informações indicando a possibilidade de a erupção estar a ocorrer a dois mil metros de profundidade, numa zona da Crista Média Atlântica, é pouco provável que cheguem à superfície materiais expelidos pela possível erupção&#8221;, afirmou a investigadora do Centro de Vulcanologia e Avaliação de Riscos Geológicos. Teresa Ferreira salientou que a erupção submarina da Serreta, ocorrida entre 1998 e 2000 ao largo da ilha Terceira, nos Açores, foi uma “situação especial”, tendo chegado à superfície materiais que foram observados por pescadores.</p>
<p>A erupção da Serreta desenvolveu-se a 400 metros de profundidade, frisou, salientando que a pressão exercida pela água muito dificilmente permitirá a chegada à superfície de materiais produzidos por uma erupção a dois mil metros de profundidade.</p>
<p>A confirmação da erupção de um vulcão na ilha canária de El Hierro só poderá, por isso, ser confirmada com recurso a instrumentos, defendeu a investigadora. Desde Julho já se sentiram nesta ilha espanhola mais de nove mil sismos, uma situação idêntica há que se viveu no final do século XVIII, quando também se temeu uma erupção na ilha.</p>
<p style="text-align:right;">fonte: www.cienciahoje.pt</p>
<p style="text-align:right;">
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		<title>Nikon Small World Photomicrography</title>
		<link>http://anatoxina.wordpress.com/2011/10/09/nikon-small-world-photomicrography/</link>
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		<pubDate>Sun, 09 Oct 2011 08:40:35 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
				<category><![CDATA[Blog]]></category>
		<category><![CDATA[Curiosidades]]></category>

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		<description><![CDATA[Imagem de Daphnia sp.  e duas colónias de Volvox sp. Fonte: http://www.boston.com/bigpicture/2011/10/nikon_small_world_photomicrogr.html<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=anatoxina.wordpress.com&amp;blog=6316153&amp;post=578&amp;subd=anatoxina&amp;ref=&amp;feed=1" width="1" height="1" />]]></description>
			<content:encoded><![CDATA[<p><a href="http://anatoxina.files.wordpress.com/2011/10/daphnia-e-volvox.jpg"><img class="aligncenter size-medium wp-image-577" title="Daphnia sp. and Dolvox sp." src="http://anatoxina.files.wordpress.com/2011/10/daphnia-e-volvox.jpg?w=300&#038;h=225" alt="" width="300" height="225" /></a></p>
<p>Imagem de <em>Daphnia sp.</em>  e duas colónias de <em>Volvox sp.</em></p>
<p style="text-align:right;">Fonte: <a href="http://www.boston.com/bigpicture/2011/10/nikon_small_world_photomicrogr.html">http://www.boston.com/bigpicture/2011/10/nikon_small_world_photomicrogr.html</a></p>
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			<media:title type="html">Daphnia sp. and Dolvox sp.</media:title>
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		<title>O maior buraco do mundo</title>
		<link>http://anatoxina.wordpress.com/2011/10/07/o-maior-buraco-do-mundo/</link>
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		<pubDate>Fri, 07 Oct 2011 17:20:35 +0000</pubDate>
		<dc:creator>anatoxina</dc:creator>
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