From owner-biophys@hgmp.mrc.ac.uk Wed Mar 10 14:39:44 2004 Return-Path: X-Original-To: biophys-outgoing Received: from localhost (localhost [127.0.0.1]) by mercury.hgmp.mrc.ac.uk (Postfix) with SMTP id 4B0BA7D19B for ; Wed, 10 Mar 2004 14:39:44 +0000 (GMT) X-Original-To: biophys-list@hgmp.mrc.ac.uk Received: from localhost (localhost [127.0.0.1]) by mercury.hgmp.mrc.ac.uk (Postfix) with ESMTP id C5F787D1D2 for ; Wed, 10 Mar 2004 14:39:43 +0000 (GMT) Received: from helium.hgmp.mrc.ac.uk (helium [193.62.192.2]) by mercury.hgmp.mrc.ac.uk (Postfix) with ESMTP id CA4CE7D19B for ; Wed, 10 Mar 2004 14:39:40 +0000 (GMT) Received: (from news@localhost) by helium.hgmp.mrc.ac.uk (8.12.10+Sun/8.12.1/Submit) id i2AEdeqY012773 for biophys-list@hgmp.mrc.ac.uk; Wed, 10 Mar 2004 14:39:40 GMT From: "Ronald Maldonado Rodriguez" X-Newsgroups: bionet.biophysics References: <6d5b021.0403090851.4f871536@posting.google.com> Subject: Re: bonds in organic molecules (please help me with this) Date: Wed, 10 Mar 2004 15:39:31 +0100 Lines: 48 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Message-ID: <404f28a8$1@nntp.unige.ch> To: biophys@hgmp.mrc.ac.uk Sender: owner-biophys@hgmp.mrc.ac.uk Precedence: bulk Prof Isaac Asimov wrote a lot about such alternative life forms based in different types of atoms, like Si, Mg, etc... and H2S oceans instead of H2O ones... yeah, about the biological significance of the sigma and Pi bonds for sure... Maybe you could check for these titles in your local library: "Building Blocks of the Universe" Editor/publisher: Abelard-Schuman, 1957 "Extraterrestrial Civilizations" Editor/publisher: Crown, 1979 "Is There Life On Other Planets?" Gareth Stevens, Inc, 1989 Isaac Asimov's Guide to Earth and Space, Random House, 1991 "How Did We Find Out About the Beginning of Life?" Walker, 1982 And Prof. Carl Sagan has also written some excellent reviews on these topics. Hope this help Ronald ---------------------------------------------------------------------------- ------- Ronald Maldonado-Rodriguez (M.Sc. Chem. Eng.) Bioenergetics Laboratory Station de Botanique. University of Geneva 10, Chemin des Embrouchis Tel 0041 22 759 9940 CH-1254 Lullier JUSSY Fax 0041 22 759 9945 Geneva, Switzerland http://www.unige.ch/sciences/biologie/bioen ---------------------------------------------------------------------------- ------- "Try not. Do. Or do not. There is no try." - Yoda ---------------------------------------------------------------------------- ------- The beauty of a friendship lies not in enjoying the similarities, but respecting the differences. "Amirsaman" a écrit dans le message de news:6d5b021.0403090851.4f871536@posting.google.com... > could you explain the biological significances of the SIGMA and PI > bonds within ORGANIC MOLECULES? > It is known that Silicon-based life is not really an alternative for > Carbon-based life because it hardly forms sigma and pi bonds within > the molecules that are formed. On the other hand, Carbon, can very > much use the sigma and pi bonds. can you tell me why Sima and Pi bonds > are required in complexifying chemical reactions and the organic > molecules? .