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meta-Directing Deactivators: –NO2, –CN, –CHO, –&NoBreak;CO2R, –COR, –CO2H

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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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Copenhagen no more

Nature Materials

|January 23, 2010

Summary

Global climate action is crucial. Nations must seize the chance for a robust agreement on reducing carbon emissions to combat climate change effectively.

Area of Science:

Environmental Science
Climate Policy

Background:

The urgency of addressing global carbon emissions is paramount.
Previous opportunities for significant international agreements on emission reductions have been missed.

Discussion:

Failure to act decisively on carbon emission cuts risks exacerbating climate change impacts.
International cooperation is essential for effective climate change mitigation.

Key Insights:

A strong international consensus on carbon emission reductions is vital.
Missed opportunities for climate agreements have significant environmental consequences.

Outlook:

Future climate negotiations must prioritize achieving substantial emission reduction targets.

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Sustained political will is necessary to secure a global agreement on climate action.