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Mar 21, 2014 · Retinol, the alcohol form of vitamin A is a key dietary component that plays a critical role in vertebrate development, cell differentiation, reproduction, vision and immune system. Natural and synthetic analogs of retinol, called retinoids, have generally been associated with the cell differentiation via retinoic acid which is the most potent metabolite of retinol. However, a direct function

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Feb 22, 2022 · 67. 2.5 million light years 68. 10,000 hairs 69. Emile Berliner 70. Heuristically programmed ALgorithmic computer 71. Nine and a half years 72. Joseph Priestley 73. Refrigerator 74. Chromosome 1 75. 210,000,000,000 litres of water per person 76. None 77. 200 billion years 78. Rutherford Appleton Laboratory 79. 99% 80. 460°C (860°F)

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Ancient Roots of Science - 7 days of the week were names after the 7 planets of ancient times - cultures built structures/special devices to help with timekeeping - Egyptians divided daytime and nighttime into 12 equal parts - Tracking of the seasons led to the advent of written calendars - Today we use a solar calendar which is synchronized

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Mar 26, 2019 · An example of a synchronous inverter, this one for a solar array. Renewable energy sources generate power via inverters that convert dc from, say, a solar array to dc. In the case of wind turbines, the turbine powers an ac generator whose frequency varies in proportion to wind energy.