Navigation Links
Chlorophyll


Chlorophyll

Ancient Greek: chloros = green and phyllon = leaf. It is a green photosynthetic pigment found in plants, algae, and cyanobacteria. The first step in photosynthesis is when incoming light is absorbed by chlorophyll, ionizing it. The resulting chemical energy is then captured in the form of ATP, and ultimately to convert carbon dioxide and water to carbohydrates and oxygen. Chlorophyll absorbs most in the red and blue portions of the electromagnetic spectrum, thus its intense green color.

Chemical structure

Chlorophyll is a chlorin pigment, which is structurally similar to porphyrin pigments such as heme. At the center of the chlorin ring is an magnesium ion. This has various side chains, usually including a long phytyl chain. There are a few different forms that occur naturally:

Chlorophyll a Chlorophyll b Chlorophyll c1 Chlorophyll c2 Chlorophyll d
Molecular formula C55H72O5N4Mg C55H70O6N4Mg C35H30O5N4Mg C35H28O5N4Mg C54H70O6N4Mg
C3 group -CH=CH2 -CH=CH2 -CH=CH2 -CH=CH2 -CHO
C7 group -CH3 -CHO -CH3 -CH3 -CH3
C8 group -CH2CH3 -CH2CH3 -CH2CH3 -CH=CH2 -CH2CH3
C17 group -CH2CH2COO-Phytyl -CH2CH2COO-Phytyl -CH=CHCOOH -CH=CHCOOH -CH2CH2COO-Phytyl
C17-C18 bond Single Single Double Double Single
Occurrence Universal Mostly in land plants Various algae Various algae Some red algae
Common structure of chlorophyll a, b and d

Evidence for chlorophyll

Absorbance spectra of by chlorophyll a (green) and b (red)

Chlorophyll can be shown to be vital for photosynthesis by destarching a leaf from a variegated plant and exposing it to light for several hours. (Variegated leaves have green areas that contain chlorophyll and white areas that have none.) When tested with iodine solution , a color change revealing the presence of starch occurs only in regions of the leaf that were green and therefore contained chlorophyll. This shows that photosynthesis does not occur in areas where chlorophyll is absent and constitutes evidence that the presence of chlorophyll is a requirement for photosynthesis.


'"/>


(Date:2/5/2015)... Jan. 28, 2015 NXT-ID, Inc. (NASDAQ: ... a biometric authentication company focused on the growing mobile ... RedChip Global Online CEO Conference on January 29 th ... Gino Pereira , CEO of NXT-ID will present and ... the Wocket smart wallet and its full suite of ...
(Date:1/22/2015)... , Jan. 9, 2015 Valid S.A. ("Company") (BM&FBOVESPA: VLID3 ... in general the State of Washington,s ... a new enrollment and central issuance system for driver,s licenses ... The project planning and development will start in January ...
(Date:1/22/2015)... WINSTON-SALEM, N.C. , Jan. 16, 2015  A man-made ... working memory and other mental capabilities in adults with ... a pilot study led by researchers at Wake Forest ... 60 adults diagnosed with amnesic mild cognitive impairment (MCI) ...
Breaking Biology News(10 mins):CEO of NXT-ID, Inc. to Discuss Company's Biometric Technologies at RedChip Online Conference January 29th 2CEO of NXT-ID, Inc. to Discuss Company's Biometric Technologies at RedChip Online Conference January 29th 3Valid USA Signs Contract For Washington Driver's License Issuance 2Nasal Spray with Insulin Equivalent Shows Promise as Treatment for Adults with Mild Cognitive Impairment, Alzheimer's Dementia 2Nasal Spray with Insulin Equivalent Shows Promise as Treatment for Adults with Mild Cognitive Impairment, Alzheimer's Dementia 3
... amyloid-beta assemblies may be one of the most important ... can reduce amyloid-beta burden and improved memory performance in ... antibodies from a human Fab phage display library is ... Thus, a recent study published in the Neural ...
... trends are a prerequisite for species, range expansion, according ... of York., The climate in Britain has warmed over ... have shifted their distributions northwards. The extent of distribution ... showing rapid expansion and others showing none at all. ...
... University of Bristol have observed mating for the first time ... tropical disease is caused by trypanosomes, single-celled parasites that are ... Bristol team were able to see what the trypanosomes were ... disease by using fluorescent markers [see image link below]. ...
Cached Biology News:Population stability 'hope' in species' response to climate change 2
Other biology definitionOther Tags