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:12/11/2014)... 09, 2014 Research and Markets ... ( http://www.researchandmarkets.com/research/9ql3kr/biometrics_market ) has announced the addition ... report to their offering. ... the adoption of multimodal biometric systems. Multimodal biometric ... individual for verification and identification purposes. This helps ...
(Date:12/10/2014)... , Dec. 8, 2014 You,ve been here ... account but can,t remember your password, site key or the ... was your first grade teacher? Today, ... the app that will finally put an end to ... 1U TM . 1U leverages a user,s smartphone ...
(Date:12/10/2014)... DIEGO , Dec. 9, 2014 CIE ... collaboration catalyst that provides the connective tissue that enhances ... enabling them to easily share client-level information; earned a ... to expand to organizations serving seniors aging in community ... Diego" partner on December 11 th 4-6p. ...
Breaking Biology News(10 mins):Biometrics Market in India 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4
... stinging jellyfish and jellyfish-like animals are transforming many ... that are intermittently jammed with pulsating, gelatinous creatures. ... squishy animals include Hawaii, the Gulf of Mexico, ... Sea, the Mediterranean Sea, Australia, the Black Sea ...
... at Albert Einstein College of Medicine of Yeshiva University ... play a role in preventing weight gain and obesity. ... . To understand what drives hunger and causes ... an almond-sized structure located deep within the brain that ...
... medical technologies are repairing the human body in ways ... are leaving an increasing population of patients who are ... infections have become a formidable clinical opponent, and foremost ... of a new text from ASM Press. ...
Cached Biology News:Brain enzyme may play key role in controlling appetite and weight gain 2New text focuses on formidable opportunistic fungus 2
Other biology definitionOther Tags