英伦广角 粘性物使骨头结实并且柔软
New news is goo news—when it’s inside our bones, anyway. Because a combination of imaging techniques and modeling has revealed that our bones are filled with a natural chemical goo that’s key to the bones’ function as support structures. The finding is in theProceedings of the National Academy of Sciences. [Erika Davie et al, Citrate bridges between mineral platelets in bone]
And it could inform research into the prevention and treatment of osteoporosis.
Bone actually largely consists of tiny crystals of calcium 1 phosphate, and the goo is in fact a combination of the compound citrate and water. The viscous 2 mixture surrounds the crystals, letting them slide and slip past each other.
The resulting flexibility 3 lets bones bend but not break under normal pressure. Most of that flexibility had been attributed to the presence of the protein collagen, but the citrate goo appears to play a big role too.
Unfortunately, as people age, the goo may begin to seep 4 out. The remaining mineral crystals then can fuse together, according to lead researcher Melinda Duer at the University of Cambridge, and the bones become brittle 5.
Keeping the goo in its proper place between the mineral crystals might thus help ward 6 off osteoporosis. Which would be a bona fide breakthrough.
- We need calcium to make bones.我们需要钙来壮骨。
- Calcium is found most abundantly in milk.奶含钙最丰富。
- Gases are much less viscous than liquids.气体的粘滞性大大小于液体。
- The mud is too viscous.You must have all the agitators run.泥浆太稠，你们得让所有的搅拌机都开着。
- Her great strength lies in her flexibility.她的优势在于她灵活变通。
- The flexibility of a man's muscles will lessen as he becomes old.人老了肌肉的柔韧性将降低。
- My anger began to seep away.我的怒火开始消下去了。
- If meteoric water does not evaporate or run overland,it may seep directly into the ground.如果雨水不从陆地蒸发和流走的话，就可能直接渗入地下。
- The pond was covered in a brittle layer of ice.池塘覆盖了一层易碎的冰。
- She gave a brittle laugh.她冷淡地笑了笑。