| 31. | This creates a concentration gradient for carbon dioxide to diffuse from the blood into the alveoli.
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| 32. | Such a concentration gradient across a semipermeable membrane sets up an osmotic flow for the water.
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| 33. | In " S . cerevisiae ", export is also against a concentration gradient.
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| 34. | Morphogens are soluble molecules that can diffuse and carry signals that control cell differentiation via concentration gradients.
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| 35. | Transcellular transport often involves energy expenditure whereas paracellular transport is unmediated and passive down a concentration gradient.
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| 36. | Spermatozoa can sense this chemoattractant and orient their swimming direction up the concentration gradient towards the oocyte.
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| 37. | It proposed an inverse relationship between the flux and the concentration gradient of a diluted chemical species.
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| 38. | Some evidence suggests active transport, because fructose uptake has been shown to occur against a concentration gradient.
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| 39. | Both utilize electric potential and / or chemical gradients to move protons and ions against their concentration gradient.
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| 40. | The concentration gradient generated from this process can then be used to synthesize fixing carbon from carbon dioxide.
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