Microclimate – The actual climatic conditions that organisms live in vary considerably within one climate.

Example of Microclimate is Shade

where temperatures under vegetation in deserts can be 10–20°C lower than sun temperatures.

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#Id: 7431

#Unit 5. Developmental Biology

CMF stimulates gene expression in parallel with PSF, and both signals potentiate cAMP signalling by inducing genes involved in cAMP synthesis and detection

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#Id: 7432

#Unit 5. Developmental Biology

Newly activated genes are:

Adenylate cyclase A (ACA)

PKA

cAMP receptors (cARs)

Extracellular cAMP phosphodiesterase PdsA

An intracellular cAMP phosphodiesterase RegA

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#Id: 7433

#Unit 5. Developmental Biology

Once all proteins are functioning, a few starving cells start to emit cAMP pulses.

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#Id: 7434

#Unit 5. Developmental Biology

Chemotaxis of Dictyostelium myxamoebae is a result of spiral waves of cAMP.

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#Id: 7435

#Unit 5. Developmental Biology

Neighboring cells respond to cAMP in two ways:

Initiate a movement toward the cAMP pulse for about a minute

Release cAMP of their own

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#Id: 7436

#Unit 5. Developmental Biology

The top of the mound continues to emit cAMP pulses and is pushed upwards by the movement of cells underneath