Talk:Life/Draft

Formating decisions

Citation style as per Help:Citation style David Tribe 01:25, 5 February 2007 (CST)

Other style standards?

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General copy discussion

In response to Larry Sanger's request, let's go about rewriting this article. For the purposes of the article, I suggest that we take the meaning of life to be equivalent to living things, and the opposite of death, and also of inanimate things or objects. Some points to cover: (1) features of living things v. inanimate things,(2) definition of death - when is something alive no longer alive? (3) which organic molecule collections have life? which don't? why? Nancy Sculerati MD 17:38, 30 December 2006 (CST)

• I note David Tribe working on this article. I added a subsection "Linguistic Considerations Relating to the Definition of Life". I may presume too much in this case, but it does speak to Nancy Sculerati's suggestion to "...take the meaning of life to be equivalent to living things...". Happy to delete or put somewhere else in article or elsewhere. --Anthony.Sebastian (Talk) 16:49, 3 February 2007 (CST)

• I also re-wrote the first paragraph of the Introduction, to provide a generalization that could set the stage for describing what we know about the common characteristics of living things. --Anthony.Sebastian (Talk) 19:11, 3 February 2007 (CST)

Thermodynamics

The intro is massive and should probably be much smaller. I usually consider them more like an abstact than an intro commmonly seen in academic papers. One way around this is to move most of the thermodynamic perspectives into a new section. Chris Day (Talk) 02:01, 5 February 2007 (CST)

• Chris: Will take your suggestion and try additional tacks to shorten Intro. Thanks. --Anthony.Sebastian (Talk) 19:25, 5 February 2007 (CST)

• Chris: Shortened Intro, moved thermodynamic perspective to separate section. --Anthony.Sebastian (Talk) 14:34, 13 February 2007 (CST)

Re-writing per Larry's Request

I have undertaken to re-write this article from the beginning, responding to suggestions along the way. I have re-written the following sections/subsections:

• Introduction
• Shared Characteristics of Living Things: Systems and Thermodynamic Perspectives
• Some Definitions of Life Resonating with the Preceding Exposition
• Other Shared Characteristics of Living Things
• Life Further Characterized (partial)

I will try to come to an intermediate closure soon, so the workgroup can consider the article for approval--with the idea that, like Biology, refinements and amplifications will find their way in.

--Anthony.Sebastian (Talk) 17:43, 12 February 2007 (CST)

Seeking opinions on what to change or further develop in this article

Taking this article in its current draft, what would others, in particular the Biology Group, like to see further developed or modified. I have much more in mind for this article, but would like to consider the practicality of getting out a draft that qualifies for consideration of approval. --Anthony.Sebastian (Talk) 14:31, 13 February 2007 (CST)

I struggled a bit with this article. I had several reservations, but I think my biggest problem was that this article has this exciting theme and somehow seems to reduce the grand question to almost pedantic considerations of definition.I really only saw the point at all when I came to Mayr's words.

• Gareth: I agree about the impact of Mayr's words. I will move that section up front. Anthony.Sebastian (Talk) 22:33, 14 February 2007 (CST)

I think the point is that the simplest living biological system is incredibly complicated, and explaining why they have to be so complicated (machinery for all the processes of living; sensing the environment, feeding, reproduction etc) and what that entails (simplest cell needs ? can't remember, is it 8000 genes?). I guess the question that that begs is how did life originate? It seems to me that is one possible direction for this article.

• Genes can't serve, because genes don't code for interactions, much less co-ordinated dynamical and hierarchical interactions. Hence need a systems science. Anthony.Sebastian (Talk) 22:33, 14 February 2007 (CST)

Another possible direction would be to talk of the diversity of life, and to explain those elements that were so important for diversification. I think you need to carefully check the text, not all cells have the machinery to reproduce themselves for example (think red blood cells).

• Yes. I had not got that far in editing the article. Anthony.Sebastian (Talk) 22:33, 14 February 2007 (CST)

I have the flu now, I guess I was expecting some discussion of viruses and life, and a discussion that persuaded me that the question of what counts as living is an interesting question, not a dictionary question. Gareth Leng 05:17, 14 February 2007 (CST)

OK, I think each of these statements is false:

• all cells have an inherited "blueprint" for constructing its components, and mechanisms for carrying out the construction;

No. Red blood cells dont have a nucleus or DNA. Sperm and ova don't have a full blueprint. Many differentiated cells are not able to reproduce themselves.

• all cells have the capability to assemble and organize themselves from more rudimentary states;

No, just not true, animal cells need a multicellular environment in order to express their developmental fate

• all cells and multicellular systems exist interdependently with other cells and multicellular systems;

does this mean anything?

• all cells and multicellular systems eventually die. I'm not sure that there is any (non trivial) reason why many organisms (fungal organisms) must dieGareth Leng 10:02, 14 February 2007 (CST)

• • Yes. Needs work. Anthony.Sebastian (Talk) 22:33, 14 February 2007 (CST)

• • Re flu: get well soon. Anthony.Sebastian (Talk) 22:33, 14 February 2007 (CST)

Fascinating work so far, but don't you think there are rather too many lists to be maximally readable? --Larry Sanger 16:13, 15 February 2007 (CST)