tag:blogger.com,1999:blog-27684133679676953492023-11-16T12:53:14.692+00:00Biologia e Geologia Ano IIEscola Secundária Conde de MonsarazUnknownnoreply@blogger.comBlogger54125tag:blogger.com,1999:blog-2768413367967695349.post-22781398438648760252011-03-29T11:59:00.000+01:002011-03-29T12:00:47.426+01:00Viagem ao mundo das trilobites<blockquote></blockquote><iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/zLim5Msq-l4" frameborder="0" allowfullscreen></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-36128180558417289372011-03-14T15:05:00.002+00:002011-03-14T16:13:03.874+00:00Revisões de 10º anoExercícios on-line<br /><br /><a href="http://www.prof2000.pt/users/geologia/testes/quiz.htm">I Fotossíntese e Transporte nas Plantas</a><br /><br /><a href="http://www.prof2000.pt/users/geologia/testes/quiz.htm">II- Fotossínte e Transporte nas Plantas</a><br /><br /><blockquote><iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/wO0O_Mp-Kcg" frameborder="0"></iframe></blockquote>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-57525471612423960972011-01-26T22:28:00.000+00:002011-01-26T22:29:11.862+00:00<div style="width:425px" id="__ss_1198806"><strong style="display:block;margin:12px 0 4px"><a href="http://www.slideshare.net/Loiruh18/sistema-de-classificao-de-whitaker-andrea" title="Sistema de classificação de whitaker (Andrea)">Sistema de classificação de whitaker (Andrea)</a></strong><object id="__sse1198806" width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=andrea1-090325180145-phpapp02&stripped_title=sistema-de-classificao-de-whitaker-andrea&userName=Loiruh18" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed name="__sse1198806" src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=andrea1-090325180145-phpapp02&stripped_title=sistema-de-classificao-de-whitaker-andrea&userName=Loiruh18" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="padding:5px 0 12px">View more <a href="http://www.slideshare.net/">presentations</a> from <a href="http://www.slideshare.net/Loiruh18">Loiruh18</a>.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-84783501723449121172011-01-26T22:25:00.001+00:002011-01-26T22:25:40.901+00:00<div style="width:425px" id="__ss_3012846"><strong style="display:block;margin:12px 0 4px"><a href="http://www.slideshare.net/sandranascimento/iv-reinos" title="IV - REINOS">IV - REINOS</a></strong><object id="__sse3012846" width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=iv-reinos-100128051326-phpapp02&stripped_title=iv-reinos&userName=sandranascimento" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed name="__sse3012846" src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=iv-reinos-100128051326-phpapp02&stripped_title=iv-reinos&userName=sandranascimento" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="padding:5px 0 12px">View more <a href="http://www.slideshare.net/">presentations</a> from <a href="http://www.slideshare.net/sandranascimento">sandranascimento</a>.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-3314648251089173712011-01-26T22:23:00.001+00:002011-01-26T22:23:29.572+00:00<div style="width:425px" id="__ss_3012456"><strong style="display:block;margin:12px 0 4px"><a href="http://www.slideshare.net/sandranascimento/iii-critrios-de-classificao-dos-seres-vivos" title="III - CRITÉRIOS DE CLASSIFICAÇÂO DOS SERES VIVOS">III - CRITÉRIOS DE CLASSIFICAÇÂO DOS SERES VIVOS</a></strong><object id="__sse3012456" width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=iii-critrios-100128042844-phpapp01&stripped_title=iii-critrios-de-classificao-dos-seres-vivos&userName=sandranascimento" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed name="__sse3012456" src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=iii-critrios-100128042844-phpapp01&stripped_title=iii-critrios-de-classificao-dos-seres-vivos&userName=sandranascimento" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="padding:5px 0 12px">View more <a href="http://www.slideshare.net/">presentations</a> from <a href="http://www.slideshare.net/sandranascimento">sandranascimento</a>.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-58904567898350356352011-01-26T22:21:00.001+00:002011-01-26T22:21:39.277+00:00<div style="width:425px" id="__ss_6157716"><strong style="display:block;margin:12px 0 4px"><a href="http://www.slideshare.net/nunocorreia/bg-27-sistemtica-dos-seres-vivos" title="Bg 27 sistemática dos seres vivos">Bg 27 sistemática dos seres vivos</a></strong><object id="__sse6157716" width="425" height="355"><param name="movie" value="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=bg27-sistemticadosseresvivos-101214052810-phpapp02&stripped_title=bg-27-sistemtica-dos-seres-vivos&userName=nunocorreia" /><param name="allowFullScreen" value="true"/><param name="allowScriptAccess" value="always"/><embed name="__sse6157716" src="http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=bg27-sistemticadosseresvivos-101214052810-phpapp02&stripped_title=bg-27-sistemtica-dos-seres-vivos&userName=nunocorreia" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="355"></embed></object><div style="padding:5px 0 12px">View more <a href="http://www.slideshare.net/">presentations</a> from <a href="http://www.slideshare.net/nunocorreia">Nuno Correia</a>.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-88502937766663583242011-01-26T22:13:00.003+00:002011-01-26T22:18:50.308+00:00Exercícios Sistemática<a href="http://galileu.esamadora.dyndns.org:81/elearning200809/mod/resource/view.php?id=378">Exercícios Sistemática</a>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-50098579118028308252011-01-04T22:40:00.001+00:002011-01-04T22:40:48.678+00:00Darwin + Mendel<object width="640" height="390"><param name="movie" value="http://www.youtube.com/v/cDCVKpFxUr8&hl=en_US&feature=player_embedded&version=3"></param><param name="allowFullScreen" value="true"></param><param name="allowScriptAccess" value="always"></param><embed src="http://www.youtube.com/v/cDCVKpFxUr8&hl=en_US&feature=player_embedded&version=3" type="application/x-shockwave-flash" allowfullscreen="true" allowscriptaccess="always" width="640" height="390"></embed></object>GrUnknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-25811728169739326722011-01-04T22:33:00.000+00:002011-01-04T22:34:01.863+00:00A Evolução de Darwin<div style="width:425px;text-align:left"><a style="font:14px Helvetica,Arial,Sans-serif;color: #0000CC;display:block;margin:12px 0 3px 0;text-decoration:underline;" href="http://www.slideboom.com/presentations/62026/a-evolu%C3%A7%C3%A3o-de-darwin" title="a evolução de darwin">a evolução de darwin</a><object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="425" height="370" id="onlinePlayer62026"><param name="movie" value="http://www.slideboom.com/player/player.swf?id_resource=62026"><param name="allowScriptAccess" value="always"><param name="quality" value="high"><param name="bgcolor" value="#ffffff"><param name="allowFullScreen" value="true"><param name="flashVars" value=""><embed src="http://www.slideboom.com/player/player.swf?id_resource=62026" width="425" height="370" name="onlinePlayer62026" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" allowscriptaccess="always" quality="high" bgcolor="#ffffff" allowfullscreen="true" flashvars=""></embed></object><div style="font-size:11px;font-family:tahoma,arial;height:26px;padding-top:2px;">View <a href="http://www.slideboom.com" style="color: #0000CC;">more presentations</a> or <a href="http://www.slideboom.com/upload" style="color: #0000CC;">Upload</a> your own.</div></div>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-68622158072641062922011-01-04T21:03:00.001+00:002011-01-04T21:03:38.654+00:00Darwin- resumo (Espanhol)<span style="font-weight: bold;"><object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/UcXCJkwH8kE?fs=1&hl=pt_PT"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/UcXCJkwH8kE?fs=1&hl=pt_PT" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object><br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-39327031520440490652011-01-04T21:01:00.000+00:002011-01-04T21:02:22.783+00:00Darwin Luta da Evolução da Origem das Espécies I<object width="640" height="385"><param name="movie" value="http://www.youtube.com/v/eD3x2Yj_wdM?fs=1&hl=pt_PT"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/eD3x2Yj_wdM?fs=1&hl=pt_PT" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="640" height="385"></embed></object>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-78132300928550077072011-01-04T21:00:00.001+00:002011-01-04T21:00:31.472+00:00Lamarck<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/DAOh5-tHrFU?fs=1&hl=pt_PT"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/DAOh5-tHrFU?fs=1&hl=pt_PT" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-61215592662915309192011-01-04T20:58:00.001+00:002011-01-04T20:58:54.087+00:00Evolução vs Criação<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/CcrTsfJUIMM?fs=1&hl=pt_PT"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/CcrTsfJUIMM?fs=1&hl=pt_PT" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-16438006576347687852010-12-13T22:04:00.006+00:002010-12-13T22:06:13.716+00:00Olimpíadas do Ambiente 2010-2011 INSCREVE-TE<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoSAiPCDBQCvYkrmR5uH_ORGvX-N6z3twl8Ribl4ccW3_vOrhQCOZB0bgEYFvg-qTQDlPQqtKghLJ71VeFkOUIw5dap1A-OICI2G0dh9ZzsyqkY4He8nmXsycssaFknrZjGLdFSokdqVM/s1600/OA.JPG"><img style="float: left; margin: 0pt 10px 10px 0pt; cursor: pointer; width: 400px; height: 59px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhoSAiPCDBQCvYkrmR5uH_ORGvX-N6z3twl8Ribl4ccW3_vOrhQCOZB0bgEYFvg-qTQDlPQqtKghLJ71VeFkOUIw5dap1A-OICI2G0dh9ZzsyqkY4He8nmXsycssaFknrZjGLdFSokdqVM/s400/OA.JPG" alt="" id="BLOGGER_PHOTO_ID_5550291588967538578" border="0" /></a><br /><span style="font-weight: bold;"><br /><br />Inscreve-te junto do teu professor de Ciências Naturais ou Biologia e Geologia<br /><br />16 de Dezembro 14:30<br />Prova: 30 questões escolha múltipla e uma pergunta de desenvolvimento<br />Duração 45minutos<br /><br /><br />Olimpíadas desaguam em Faro</span><br />As OA constituem uma sólida opção para motivar a integração dos conceitos e práticas ambientais no ensino formal nas escolas portuguesas. Esta iniciativa pretende não só sensibilizar para a temática ambiental, como também despertar a criatividade de cada aluno apresentando vários desafios e três formatos de participação. O projecto tem uma larga abrangência na comunidade escolar, sendo destinado a alunos do 3º ciclo do Ensino Básico, a alunos do Ensino Secundário e a professores de todas as escolas nacionais.<br /><br /><span style="font-weight: bold;">Água é tema central</span><br />Ao longo da edição a Água será o tema central, focando-se igualmente as ameaças globais, conservação da natureza, estilos de vida, política ambiental, poluição realidade nacional e recursos naturais. Tendo constituído uma aposta ganha em edições anteriores, nas XVI OA mantêm-se as modalidades de participação:<br />- Ambiente à Prova - os alunos são desafiados a testar os seus conhecimentos sobre o Ambiente e Sustentabilidade através da realização de provas<br />- Ambiente e Cidadania - os professores são incentivados a apresentar as acções (com reflexo no Ambiente) que venham a conceber e a promover junto da comunidade escolar<br />- Ambiente e Arte - as escolas terão a oportunidade de criar graficamente o cartaz das XVII Olimpíadas do Ambiente (2011/2012).<br /><br /><span style="font-weight: bold;">Final </span><br />A Final Nacional decorrerá entre os dias 28 de Abril e 1 de Maio 2011 no Algarve e contará com cerca de 100 participantes de todo o paísUnknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-19056660354397859332010-11-28T21:47:00.001+00:002010-11-28T21:50:05.674+00:00A música também retrata a evolução<blockquote></blockquote> <iframe title="YouTube video player" class="youtube-player" type="text/html" width="480" height="390" src="http://www.youtube.com/embed/5HL1IlmEyFo" frameborder="0"></iframe><br /><br /><br /><blockquote></blockquote><iframe title="YouTube video player" class="youtube-player" type="text/html" width="640" height="390" src="http://www.youtube.com/embed/aDaOgu2CQtI" frameborder="0"></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-57033616552394555562010-11-28T21:38:00.001+00:002010-11-28T21:47:30.970+00:00A Evolução segundo os Simpsons<blockquote></blockquote><iframe title="YouTube video player" class="youtube-player" type="text/html" width="480" height="390" src="http://www.youtube.com/embed/faRlFsYmkeY" frameborder="0"></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-12111213932938633452010-11-21T21:32:00.003+00:002010-11-21T21:36:49.957+00:00Modelo Endossimbiótico<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisep9xLLmWeHDZXZ6lWMEKX1R70FOhyphenhyphenM7t4lILPKhGC705_NyyOvqWcicDrWzxddKRGkOUtKmbzNo3hqaJPOa8FWNT7xA1NtnfwbfusuGDgV7EnkeJzb22cY0dyYfd583Q_7qeULpUZzw/s1600/Endossimbi%25C3%25B3tico.png"><img style="float:left; margin:0 10px 10px 0;cursor:pointer; cursor:hand;width: 320px; height: 146px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEisep9xLLmWeHDZXZ6lWMEKX1R70FOhyphenhyphenM7t4lILPKhGC705_NyyOvqWcicDrWzxddKRGkOUtKmbzNo3hqaJPOa8FWNT7xA1NtnfwbfusuGDgV7EnkeJzb22cY0dyYfd583Q_7qeULpUZzw/s400/Endossimbi%25C3%25B3tico.png" border="0" alt=""id="BLOGGER_PHOTO_ID_5542119655665166978" /></a><br />Este modelo admite que a célula eucariótica surgiu a partir de outras células procarióticas que se associaram em relações de simbiose. Assim as célula procariótica ingeriam outras vivendo as duas numa cooperação mútua que trazia benefícios a ambas as células. Com o passar dos tempos, isto permitiu a especialização e a criação de organelos membranares, levando ao aparecimento das células eucarióticas.<br /><br />Apesar deste modelo não conseguir explicar bem a formação do núcleo tem duas provas que oparecem apoiar:<br /><br />• Os cloroplastos e as mitocôndrias apresentam membranas internas que são capazes de se dividir independentemente do núcleo;<br />• Tanto os cloroplastos como as mitocôndrias possuem DNA.Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-54716043958453190252010-11-21T21:30:00.003+00:002010-11-21T21:32:45.461+00:00Modelo AutogénicoEste modelo admite que a célula eucariótica terá surgido a partir de organismos procariontes.<br />O modelo autogénico defende que as células eucarióticas surgiram a partir de células procarióticas que desenvolveram sistemas endomembranares a partir de invaginações existentes na membrana plasmática.<br /><br />Desta forma foi possível às células fazer uma divisão interna das suas funções, ou seja, os organelos especializaram-se. Os defensores deste modelo sugerem que o primeiro compartimento a surgir dentro da célula foi o invólucro nuclear, o que permitiu a individualização do material genético no interior do núcleo. Em fases seguintes, terão surgido outros organelos membranares especializados.<br /><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikHD-HjCJ8kIOmxTbVmHJV8gSzrYvA7kPIlvKMTcMdzaTvhQrFTxB3na5sZQrVVYAnaefDnrIwnAAa9yJYIEtFjAoRvmY579EOtFKC27n2gsr1ZUlq_UjbMyz-DeNSpTP62quUuo-WX_g/s1600/Autogen%25C3%25A9tico.png"><img style="float:left; margin:0 10px 10px 0;cursor:pointer; cursor:hand;width: 310px; height: 304px;" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEikHD-HjCJ8kIOmxTbVmHJV8gSzrYvA7kPIlvKMTcMdzaTvhQrFTxB3na5sZQrVVYAnaefDnrIwnAAa9yJYIEtFjAoRvmY579EOtFKC27n2gsr1ZUlq_UjbMyz-DeNSpTP62quUuo-WX_g/s400/Autogen%25C3%25A9tico.png" border="0" alt=""id="BLOGGER_PHOTO_ID_5542118615997055362" /></a>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-89797540546095490392010-11-21T20:53:00.000+00:002010-11-21T20:58:02.832+00:00Volvox<blockquote></blockquote><iframe title="YouTube video player" class="youtube-player" type="text/html" width="480" height="390" src="http://www.youtube.com/embed/He9FSeGRi3A" frameborder="0"></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-42253581374703692252010-11-21T20:14:00.000+00:002010-11-21T20:15:09.126+00:00Células Eucariontes<blockquote></blockquote><iframe title="YouTube video player" class="youtube-player" type="text/html" width="480" height="390" src="http://www.youtube.com/embed/1H1Ytf9n_SE" frameborder="0"></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-82507897291520544792010-11-21T20:01:00.000+00:002010-11-21T20:10:22.608+00:00Evolução<blockquote></blockquote><iframe title="YouTube video player" class="youtube-player" type="text/html" width="480" height="390" src="http://www.youtube.com/embed/Rs7ZQTBiVYY" frameborder="0"></iframe>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-34411701461803235192010-11-18T20:29:00.002+00:002010-11-18T20:32:32.619+00:00Temas para a Ficha de 10º Ano<!--[if gte mso 9]><xml> <w:worddocument> <w:view>Normal</w:View> <w:zoom>0</w:Zoom> <w:trackmoves/> <w:trackformatting/> <w:hyphenationzone>21</w:HyphenationZone> <w:punctuationkerning/> <w:validateagainstschemas/> <w:saveifxmlinvalid>false</w:SaveIfXMLInvalid> <w:ignoremixedcontent>false</w:IgnoreMixedContent> <w:alwaysshowplaceholdertext>false</w:AlwaysShowPlaceholderText> <w:donotpromoteqf/> <w:lidthemeother>PT</w:LidThemeOther> <w:lidthemeasian>X-NONE</w:LidThemeAsian> <w:lidthemecomplexscript>HE</w:LidThemeComplexScript> <w:compatibility> <w:breakwrappedtables/> <w:snaptogridincell/> <w:wraptextwithpunct/> <w:useasianbreakrules/> <w:dontgrowautofit/> <w:splitpgbreakandparamark/> 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mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} </style> <![endif]--> <p class="MsoListParagraphCxSpFirst" style="margin-left: 42.55pt; text-indent: -7.1pt; color: rgb(204, 0, 0);"><span style="line-height: 115%;font-family:Symbol;font-size:14pt;" ><span style="">·<span style="font: 7pt "Times New Roman";"> </span></span></span><span dir="LTR"></span><span style="line-height: 115%;font-size:14pt;" >Biosfera e diversidade biológica</span></p> <p class="MsoListParagraphCxSpMiddle" style="margin-left: 42.55pt; text-indent: -7.1pt; color: rgb(204, 0, 0);"><span style="line-height: 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mso-fareast-language:EN-US;} </style> <![endif]-->Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-31545314238784832732010-11-12T13:01:00.002+00:002010-11-12T13:02:30.148+00:00Gene do sono finalmente identificado<h2><span style="font-size:85%;">O ABCC9 é o primeiro a ser detectado na população em geral</span></h2><div><span style="font-size:85%;">2010-11-11</span></div><span style="font-size:85%;"><em><div class="image-left" style="width: 320px;"><img src="http://www.cienciahoje.pt/files/46/46025.jpg" title="" alt="" width="320" height="224" /></div>Muitos de nós sentem-se como <em>‘zombies’</em> sem oito horas de sono, enquanto outros ficam perfeitamente bem e recuperados do cansaço com menos. Agora, os geneticistas parecem ter descoberto, na população em geral, o gene que influencia a quantidade de sono de que necessitamos.<br /><br />Em parte, este estudo também interessa aos biólogos por variar segundo diferentes factores, como o peso, que pode fazer com que determinadas pessoas tenham uma maior inclinação para desenvolver diabetes e doenças cardíacas. Além disso, quanto maior for a massa corporal de um indivíduo, menos este precisa de dormir.<br /></em></span><span style="font-size:85%;">Na tentativa de encontrar o gene do sono, uma equipa europeia estudou as populações de sete países, desde a Estónia até Itália, com 4260 voluntários. Cada um dos participantes preencheu um questionário relativo a hábitos de sono e deu uma amostra de DNA – que posteriormente foi varrido por milhares de marcadores genéticos, para conseguir identificar aquele que seria mais comum nas pessoas que dormem mais.<br /><br />A duração do período de descanso nocturno parece estar fortemente relacionado com um dos marcadores no gene ABCC9. Quando lhes é permitido dormir o quanto quiserem, os que têm duas cópias da versão deste marcador dormem seis por cento menos do que os que têm a outra versão, segundo o estudo apresentado esta semana, por investigadores da Universidade de Munique (Alemanha), na reunião anual da Sociedade Americana de Genética Humana, em Washington, D.C.</span> <span style="font-size:85%;"><br /><br />O gene ABCC9 codifica uma proteína chamaram SUR2 que é parte de um canal de potássio, uma estrutura que canaliza iões de potássio para dentro e fora das células. Os investigadores fizeram uma experiência em duas espécies de moscas da fruta e quando modificaram a expressão do gene, estas dormiram significativamente menos, comparando com os grupos de controlo, refere o estudo.</span> <span style="font-size:85%;"><br /><br />Entretanto, um novo gene, Dec2, foi igualmente identificado e relacionado com a duração do sono, mas encontrado apenas nalgumas pessoas. O ABCC9 é o primeiro que estabelece uma forte relação com o tempo de sono e que é detectado na população em geral.<br /><a href="http://www.cienciahoje.pt/index.php?oid=46024&op=all"><br />http://www.cienciahoje.pt/index.php?oid=46024&op=all</a><br /></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-85783821575998888332010-11-12T13:00:00.001+00:002010-11-12T13:00:21.663+00:00Animal com maiores testículos é um gafanhoto<h2><span style="font-size:85%;"> Platycleis affinis ultrapassa outras 20 espécies do mesmo tipo</span></h2><div><span style="font-size:85%;">2010-11-10</span></div><span style="font-size:85%;"><em><div class="image-left" style="width: 227px;"><img src="http://www.cienciahoje.pt/files/45/45979.jpg" title="" alt="Testículos representam 14 por cento da massa corporal." width="227" height="300" /><div class="image-caption">Testículos representam 14 por cento da massa corporal.</div></div>A criatura que tem os maiores testículos em relação ao seu tamanho é um insecto, uma espécie comum do gafanhoto, revela um estudo hoje publicado no jornal«<a href="http://rsbl.royalsocietypublishing.org/content/early/2010/10/21/rsbl.2010.0840.full?sid=9a4552fd-38c7-46d8-99be-f3cd6768e288">Biology of Letters</a>», da Royal Society.<br /><br />O<em> Platycleis affinis </em>tem uns testículos que representam quase 14 por cento da sua massa corporal. Comparativamente, para um homem adulto, isto significaria pelo menos dez quilos.<br /><br /><strong>“Não queríamos acreditar no tamanho dos seus órgãos. Davam a impressão de ocupar todo o abdómen”</strong>, disse Karim Vahed, especialista em ecologia comportamental da Universidade de Derby.<br /></em></span><span style="font-size:85%;">O <em>Platycleis affinis</em> ultrapassa, de longe, as outras 20 espécies de gafanhotos estudadas pelos investigadores britânicos.<br /><br />Outra conclusão curiosa é que as dimensões fora do normal não permitem ao insecto produzir mais esperma quando fecunda uma fêmea, ao contrário do que geralmente se assume na evolução das espécies.</span> <span style="font-size:85%;"><br /><br />De facto, os testículos tendem a ser mais volumosos entre as espécies cujas fêmeas têm mais parceiros, o que permite ao macho que produz mais esperma ter uma vantagem em relação aos seus rivais, uma vez que têm mais possibilidades de fecundar a fêmea e reproduzir-se.<br /><br /><a href="http://www.cienciahoje.pt/index.php?oid=45978&op=all">http://www.cienciahoje.pt/index.php?oid=45978&op=all</a></span>Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-2768413367967695349.post-54786609933931130972010-11-09T00:09:00.000+00:002010-11-09T00:10:28.238+00:00Verifica o que sabes!!!!! (todas as matérias)<a href="http://www.netxplica.com/manual.virtual/biologia11.html">http://www.netxplica.com/manual.virtual/biologia11.html</a>Unknownnoreply@blogger.com0