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the Calvin cycle???help please

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the Calvin cycle???help please

Postby thecab13 » Fri Oct 02, 2009 2:51 am

i just need a simple not confusing explanantion to what the clavin cyle is and what it does please.
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Postby JackBean » Fri Oct 02, 2009 10:04 am

To wish a simple explanation of something, what is the central part of metabolism, that's not really easy task :-D
Last edited by JackBean on Mon Oct 12, 2009 10:52 pm, edited 1 time in total.
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Postby jwalin » Mon Oct 12, 2009 2:52 pm

i hope am not too late.
in the cycle a co2 is added to 5C compound the RUBPwhich forms a 6C unstable compound which goes on to form a 3 C stable compound called GP.
this further forms another 3C the triose phosphate using ATP and reduced NADP which is a Hydrogen provided made in the light dependant stages. this triose.... goes on to form glucose, aminoacids and lipids or RUBP.
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Postby jwalin » Mon Oct 12, 2009 2:53 pm

do you understand what i mean by reduced NADP
ask if necessary
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Re:

Postby JackBean » Tue Oct 13, 2009 12:43 am

jwalin wrote:i hope am not too late.
in the cycle a co2 is added to 5C compound the RUBPwhich forms a 6C unstable compound which goes on to form a 3 C stable compound called GP.
this further forms another 3C the triose phosphate using ATP and reduced NADP which is a Hydrogen provided made in the light dependant stages. this triose.... goes on to form glucose, aminoacids and lipids or RUBP.

First, quite interesting name name for a compound - GP, isn't it? :lol:
NADPH is actually electron provided and made blablabla, not hydrogen ;)
And last, but not least :) this triose called glyceraldehyde phosphate is primarily recycled, that's why is it called The Calvin CYCLE and why it can work all the time ;) Just a minor part is transformed to hexose (primarily fructose), the rest has nothing to do with the Calvin cycle ;)
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Postby jwalin » Tue Oct 13, 2009 1:29 am

yeah sorrry i meant hydrogen provider or donor and not " provided"

to Jackbean
anotherr thing RUBP is recyced isn't it ?? i thought and so my text also says the same. and hhence it's called the calvin cycle.
about the last part i.e. " just minor.....calvin cycle" i have not studied that yet just in the 12th you kn ow. thank you for telling me only a minor part is used in the ccycle.
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Postby jwalin » Tue Oct 13, 2009 1:30 am

just to add to the information
ribulose bisphosphate caboxylase catalyses the combination of RUBP and CO2
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Postby JackBean » Tue Oct 13, 2009 2:36 am

Heh, sorry, but I think I don't get you.

My point wasn't provided/provider, because you wrote it corectly, that it is provided by the "light" reaction, my point was, that it is electron, not hydrogen, what is provided ;) The hydrogen is there just to keep it electroneutral ;)
Yes, RuBP is recycled, as well as PGAL is recycled (just by another part of the cycle ;) ). I wrote it bad, it was supposed to be "is used for recycling" ;)
About the last part - you got me wrong again :-D I wrote, that most of it is recycled and only minor part is used for formation of hexose and the other stuff ;)
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Re: the Calvin cycle???help please

Postby jwalin » Tue Oct 13, 2009 3:50 am

crystal clear sir :)
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Re: the Calvin cycle???help please

Postby fkfong » Thu Dec 02, 2010 12:33 pm

This reply won't make it simpler for you to understand the Calvin cycle. The Calvin cycle, or the carbon cycle in photosynthesis, actually does not exist in photosynthesis, according to the findings of Melvin Calvin and his co-workers at Berkeley and Francis K. Fong et al at Purdue and NSFfunding dot com, published in the permanent literature. The Calvin cycle dates back to the publication of a single news item, Chem. & Eng. News, 33, 2809 (July 4, 1955), contrary to the entire body of published results in reputable research journals from 1900 to the present. It is the current topic for governmental investigation involving the National Science Foundation and its Office of Inspector General. For the latest development in this investigation, please visit NSFfunding dot com's webpage.
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Postby JackBean » Thu Dec 02, 2010 2:11 pm

and your point is?
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Re: the Calvin cycle???help please

Postby fkfong » Thu Dec 02, 2010 4:11 pm

My point is as follows.
Please visit Wikipedia's article on the Calvin cycle. I believe that it is representative of the commonly accepted view of the Calvin cycle.
The Wikipedia Calvin cycle article's first reference is Bassham and Calvin (1950), in which Bassham and Calvin proposed the photosynthetic carbon cycle, later known as the Calvin cycle. The second reference skips over 56 years of research published in the permanenet literature, to the monograph (not a research paper in a peer-reviewed journal) by Campbell, Williamson and Heyden (2006).
References cited in the Widipedia page on the Calvin cycle:
1.^ Bassham J, Benson A, Calvin M (1950). "The path of carbon in photosynthesis". J Biol Chem 185 (2): 781–7. PMID 14774424. http://www.jbc.org/cgi/reprint/185/2/781.pdf.
2.^ Campbell, Neil A.; Brad Williamson; Robin J. Heyden (2006). Biology: Exploring Life. Boston, Massachusetts: Pearson Prentice Hall. ISBN 0-13-250882-6. http://www.phschool.com/el_marketing.html.
However, omitted from the Wikipedia article on the Calvin cycle are the original papers by the Calvin group and others: Calvin,M. and Massini,P. (1952) Experientia 8, 445-484Refs. 6-10; Wilson,A.T. and Calvin,M. (1955) J. Am. Chem. Soc. 77, 5948-5957; Bassham, J.A., Shibata, K., Steenberg, K., Bourdon, J. and Calvin, M. (1956) J. Am. Chem. Soc., 78, 4120-4124; Vishniac, W., Horecker, B.L., and Ochoa, S. (1957) Adv. Enzymol. 19, 1-77; Bassham, J.A. and Calvin, M. (1957) "The Path of Carbon in Photosynthesis," Prentice-Hall, Inc., Englewood Cliffs, N.J.; Calvin, M. and Pon, N.G. (1959) J. Cellular Comp. Physiol., 54, Suppl. 1, 51-74; and Bassham, J.A. and Kirk, M. (1960) Biochim. Biophys. Acta, 43, 447-464.
These omitted papers, without a single exception, in refuting Bassham and Calvin (1950), reported that photosynthetic carbon fixation occurs in a noncyclic path, directly in the light, via a reductive system as yet unknown.
In 1988, Francis K. Fong and his group at Purdue and NSFfrunding.com provided a molecular mechanism for the reductive carbon metabolic path reported by Calvin et al. See, Fong, Francis K. and Butcher, Karen A. (1988) Biochem. Biophys. Res. Commun., 150, 399-404.
This reductive path of carbon in photosynthesis is schematically represented in Fig. 2 of NSFfunding.com's page entitled "the Calvin Cycle Website,"
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