英文字典,中文字典,查询,解释,review.php


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       


安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!










  • Sunlight and Vitamin D: A global perspective for health - PMC
    Because vitamin D is fat soluble upon its ingestion or production in the skin vitamin D 3 gets incorporated into the body fat and is also transported to the liver to be converted to 25(OH)D 22, 73, 171-174 As a result to treat vitamin D deficiency and prevent recurrence, vitamin D can be given daily, weekly and even monthly with the same
  • Vitamin D from Sunlight: How To Know If Your Sun Exposure Is . . .
    You can find some useful information about ultraviolet radiation here: How Sunlight And Ultraviolet Radiation Affect Us The Angle Of The Sun And Vitamin D Production In order for the sun to stimulate your Vitamin D production, the sun needs to be at a minimum of about 50 degrees, or greater, above the horizon (90% would be directly overhead)
  • How The Sun Helps Your Skin Create Vitamin D - lifenotlabs. com
    For the sun to effectively stimulate vitamin D production in human skin, it must reach a sufficient angle in the sky so that ultraviolet B (UVB) radiation can penetrate the Earth’s atmosphere This capability largely depends on the solar elevation angle, which is influenced by several key factors including the time of day, geographic location
  • Your Shadow Can Tell You if it’s the Right Time to Make Vitamin D
    Time in the sun – under the right conditions, the body can produce 10,000 to 25,000 IU of vitamin D with full body exposure in just under the time it takes for your skin to turn pink, but not on your first day out in the sun after a long winter You should increase your exposure time gradually as this allows your skin to adapt to the sun’s
  • Ask the Doctors - How much sunshine do I need for enough . . .
    Disabled people and infants are often less likely to go outdoors, and people over the age of 70 don't produce vitamin D3 from their skin as effectively As for people with darker skin, they have more melanin, so less UV light gets absorbed to create vitamin D3 They need more sun exposure to produce vitamin D3 than those with lighter skin
  • Does the Skin Produce Vitamin D? Understanding the Connection . . .
    The skin synthesizes vitamin D upon exposure to UVB rays The process involves converting 7-dehydrocholesterol into previtamin D3 and then vitamin D3 Factors like time of day, geographical location, and skin type affect vitamin D synthesis The Role of Dietary Sources of Vitamin D
  • Calculate the sunlight you need for vitamin D | Overcoming MS
    If you want to use a sun-bed to increase your vitamin D production on cloudy days, be aware that most sun-beds do provide a mix of UVA and UVB rays, but check to be sure before you use or buy one If you do use a sun-bed, limit your time and UVB intensity to about a third of what you would spend in the sun to avoid the risk of unnecessary skin


















中文字典-英文字典  2005-2009