| 11. | There is no net energy flow over one half cycle.
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| 12. | To create and build these structures consumes less net energy than comparable construction methods.
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| 13. | The energy return on energy invested is quite low, so it produces little net energy.
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| 14. | In this model, the currency being optimized is usually net energy gain per unit time.
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| 15. | This enzyme is activated during times of net energy usage and metabolic stress, including hypoxia.
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| 16. | India is net energy importer to meet nearly 45 % of its total primary energy.
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| 17. | Net energy is absorbed by an endothermic reaction.
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| 18. | Thus, the currency in this situation could be defined as net energy gain per unit time.
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| 19. | The high net energy gain of this proposal derives from the Moon's much shallower gravitational well.
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| 20. | Therefore, many organisms convert ammonia to urea, even though this synthesis has a net energy cost.
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