Relative humidity-and ABA-induced variation in carbon and oxygen isotope ratios of cotton leaves. Plant Cell Environ 23: 473-485 Barbour MM, Farquhar GD (2004) Do pathways of water movement and leaf anatomical dimensions allow development of gradients in (H2O)-O-18 between veins and the sites of evaporation within leaves? Plant Cell Environ 27: 107-121 Barbour MM, Fischer RA, Sayre KD, Farquhar GD (2000a) Oxygen isotope ratio of leaf and grain material correlates with stomatal conductance and grain yield in irrigated wheat.

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Closing schools is effective at reducing transmission between children but has only a moderate effect on average transmission rates in the wider population unless children are disproportionately affected.