| 41. | The average concentration is 0.07 micrograms per liter.
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| 42. | The silver concentration is less than one microgram per liter.
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| 43. | Its concentration was measured to be 8 micrograms per liter.
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| 44. | The zinc concentration was once measured to be 20 micrograms per liter.
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| 45. | The recommended dietary allowance is 55 to 70 micrograms.
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| 46. | The Recommended Daily Allowance for adults is 6 micrograms.
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| 47. | The standard reading is 65 micrograms per cubic meter.
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| 48. | Readings in other Texas cities were as low as 15 to 32 micrograms.
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| 49. | Half a cup of cooked lentils contains 180 micrograms.
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| 50. | The ones on 400 micrograms had a positive response.
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