DCMU
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| Dcmu | ||
|---|---|---|
| Image:Diuron.png | ||
| General | ||
| Name | DCMU | |
| Chemical name | Diuron, 3-(3,4-dichlorophenyl)-1,1-dimethylurea | |
| Empirical formula | C9H10Cl2N2O | |
| CAS registry number | 330-54-1 | |
| Properties | ||
| Molecular mass | 233.10 g/mol | |
| Density | 1.48 g/cm³ | |
| Melting point | 158 °C | |
| Boiling point | 180 °C | |
| Vapor pressure | 1.1 mPa (25 °C) | |
| Solubility | water soluble (42 mg/L) | |
| Safety | ||
| Hazard symbol |   | |
| Harmful | Dangerous for the environment | |
| Threshold Limit Value | 5 mg/m³ | |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | ||
DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) is a herbicide that inhibits photosynthesis. It was released by Bayer in 1954 under the name of Diuron.
Mechanism of action
DCMU is a very specific and sensitive inhibitor of photosynthesis. It blocks the plastoquinone binding site of photosystem II, disallowing the electron flow from where it is generated, in photosystem II, to plastoquinone. This interrupts the photosynthetic electron transport chain in photosynthesis and thus blocks the ability of the plant to turn light energy into chemical energy (ATP and reductant potential).
DCMU only blocks electron flow from photosystem II, it has no effect on photosystem I or other reactions in photosynthesis, such as light absorption or carbon fixation in the Calvin cycle.
Because it absorbs electrons oxidized from water in PS II, the electron "hole" of PS I cannot be satisfied, effectively shutting down photosynthesis by blocking the reduction of NADP+ to NADPH, and the cyclic photosynthetic pathway since electron shuttling is associated with proton pumping across the membrane into the lumen.
Applications
Besides its use a herbicide, DCMU is often used to research energy flow in photosynthesis.de:DCMUfr:Diuron nl:Diuron
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
