Ng\u1ecdc trai do m\u1ed9t lo\u1ea1i s\u00f2 ng\u1ecdc ti\u1ebft ra trong qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng. Khi c\u00f3 c\u00e1c h\u1ea1t c\u00e1t, k\u00fd sinh tr\u00f9ng ho\u1eb7c d\u1ecb v\u1eadt b\u1ea5t k\u1ef3, ng\u1eabu nhi\u00ean l\u1ecdt v\u00e0o trong v\u1ecf s\u00f2, con s\u00f2 l\u1eadp t\u1ee9c s\u1ebd ti\u1ebft ra c\u00e1c h\u1ee3p ch\u1ea5t protein v\u00e0 canxi cacbonat \u0111\u1ec3 bao b\u1ecdc h\u1ea1t c\u00e1t, d\u1ecb v\u1eadt. H\u1ebft ng\u00e0y n\u00e0y qua ng\u00e0y kh\u00e1c, m\u1ed9t vi\u00ean ng\u1ecdc trai s\u00e1ng l\u1ea5p l\u00e1nh \u0111\u01b0\u1ee3c h\u00ecnh th\u00e0nh. Ng\u1ecdc trai \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao do v\u1ebb s\u00e1ng l\u1ea5p l\u00e1nh c\u1ee7a n\u00f3. V\u00ec sao ng\u1ecdc trai l\u1ea1i c\u00f3 th\u1ec3 s\u00e1ng l\u1ea5p l\u00e1nh nh\u01b0 v\u1eady?<\/p>\n\n\n\n
Nguy\u00ean do l\u00e0 \u1edf m\u1eb7t ngo\u00e0i c\u1ee7a ng\u1ecdc trai c\u00f3 b\u1ecdc m\u1ed9t l\u1edbp ch\u1ea5t keo s\u00e1ng b\u00f3ng, ch\u00ednh l\u1edbp keo n\u00e0y l\u00e0m n\u00ean v\u1ebb \u0111\u1eb9p c\u1ee7a ng\u1ecdc trai. H\u01a1n 90% l\u1edbp v\u1ecf b\u00f3ng n\u00e0y l\u00e0 canxi cacbonat, ngo\u00e0i ra c\u00f2n c\u00f3 m\u1ed9t \u00edt h\u1ee3p ch\u1ea5t h\u1eefu c\u01a1, m\u1ed9t \u00edt kim lo\u1ea1i v\u00e0 m\u1ed9t s\u1ed1 c\u00e1c gi\u1ecdt n\u01b0\u1edbc k\u00edch th\u01b0\u1edbc r\u1ea5t b\u00e9. Ch\u00ednh c\u00e1c h\u1ea1t r\u1eafn v\u00e0 c\u00e1c gi\u1ecdt ch\u1ea5t l\u1ecfng nh\u1ecf li ti t\u1ea1o n\u00ean m\u1ed9t l\u1edbp c\u00f3 kh\u1ea3 n\u0103ng chi\u1ebft x\u1ea1 \u00e1nh s\u00e1ng l\u1edbn, ch\u00ednh nh\u1edd \u0111\u00f3 m\u00e0 khi \u0111\u01b0\u1ee3c \u00e1nh s\u00e1ng chi\u1ebfu v\u00e0o, ng\u1ecdc trai s\u1ebd ph\u00e1t s\u00e1ng l\u1ea5p l\u00e1nh r\u1ea5t \u0111\u1eb9p m\u1eaft.<\/p>\n\n\n\n
Do ng\u1ecdc trai v\u1ed1n kh\u00f4ng \u0111\u01b0\u1ee3c \u1ed5n \u0111\u1ecbnh l\u1eafm, n\u00ean ng\u1ecdc trai th\u01b0\u1eddng c\u00f3 tu\u1ed5i th\u1ecd x\u00e1c \u0111\u1ecbnh. M\u1ed9t vi\u00ean ng\u1ecdc trai th\u01b0\u1eddng c\u00f3 “tu\u1ed5i th\u1ecd” kho\u1ea3ng 100 n\u0103m. Sau m\u1ed9t th\u1eddi gian d\u00e0i, l\u1edbp n\u01b0\u1edbc \u1edf ngo\u00e0i m\u1eb7t c\u00f3 th\u1ec3 b\u1ecb bay \u0111i h\u1ebft, v\u00e0 vi\u00ean ng\u1ecdc trai s\u1ebd b\u1ecb m\u1edd, b\u1ecb “l\u00ec” \u0111i, cu\u1ed1i c\u00f9ng s\u1ebd m\u1ea5t m\u00e0u, th\u1eadm ch\u00ed b\u1ecb v\u1ee1 n\u00e1t. V\u00ec v\u1eady c\u00e1c vi\u00ean ng\u1ecdc trai c\u1ed5 kh\u00f4ng th\u1ec3 l\u01b0u gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1ebfn ng\u00e0y nay.<\/p>\n\n\n\n
Ng\u1ecdc trai th\u01b0\u1eddng c\u00f3 b\u1ed1n lo\u1ea1i ch\u00ednh: m\u00e0u tr\u1eafng, m\u00e0u v\u00e0ng, m\u00e0u xanh nh\u1ea1t v\u00e0 m\u00e0u ph\u1ea5n h\u1ed3ng, trong \u0111\u00f3 lo\u1ea1i ng\u1ecdc trai m\u00e0u ph\u1ea5n h\u1ed3ng l\u00e0 qu\u00fd nh\u1ea5t. L\u1edbp v\u1ecf c\u1ee7a ng\u1ecdc trai do m\u1ed9t lo\u1ea1i protein m\u00e0u tr\u1eafng l\u00e0 pocphirin k\u1ebft h\u1ee3p v\u1edbi m\u1ed9t s\u1ed1 kim lo\u1ea1i th\u00e0nh th\u1ec3 pocphirin. Khi pocphirin k\u1ebft h\u1ee3p v\u1edbi nguy\u00ean t\u1ed1 kim lo\u1ea1i kh\u00e1c nhau s\u1ebd cho c\u00e1c th\u1ec3 pocphirin kh\u00e1c nhau, t\u1ea1o n\u00ean m\u00e0u s\u1eafc kh\u00e1c nhau c\u1ee7a ng\u1ecdc trai. V\u00ed d\u1ee5 ng\u1ecdc trai c\u00f3 m\u00e0u ph\u1ea5n h\u1ed3ng l\u00e0 c\u00f3 ch\u1ee9a kim lo\u1ea1i natri v\u00e0 k\u1ebdm, ng\u1ecdc trai c\u00f3 m\u00e0u v\u00e0ng l\u00e0 c\u00f3 ch\u1ee9a \u0111\u1ed3ng v\u00e0 kh\u00e1 nhi\u1ec1u kim lo\u1ea1i b\u1ea1c. Ngo\u00e0i ra ph\u1ee5 thu\u1ed9c th\u1ec3 pocphirin nhi\u1ec1u ho\u1eb7c \u00edt m\u00e0 c\u00f3 th\u1ec3 c\u00f3 m\u00e0u \u0111\u1eadm nh\u1ea1t kh\u00e1c nhau.<\/p>\n\n\n\n
Ngo\u00e0i t\u00e1c d\u1ee5ng l\u00e0m \u0111\u1ed3 trang s\u1ee9c, ng\u1ecdc trai c\u00f2n l\u00e0 m\u1ed9t d\u01b0\u1ee3c ph\u1ea9m qu\u00fd trong \u0111\u00f4ng y. Ng\u1ecdc trai c\u00f3 t\u00e1c d\u1ee5ng an th\u1ea7n, gi\u1ea3i \u0111\u1ed9c, m\u1ea1nh c\u01a1, thanh nhi\u1ec7t, l\u00e0m s\u00e1ng m\u1eaft. V\u00ec v\u1eady trong c\u00e1c lo\u1ea1i thu\u1ed1c ho\u00e0n t\u00e1n nh\u01b0: Tr\u00e2n ch\u00e2u ho\u00e0n, l\u1ee5c th\u1ea7n ho\u00e0n, an cung ng\u01b0u ho\u00e0ng h\u00e0n, thu\u1ed1c b\u1ed5 m\u1eaft b\u00e1t b\u1eedu \u0111\u00e3 d\u00f9ng ng\u1ecdc trai l\u00e0m th\u00e0nh ph\u1ea7n ch\u00ednh.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: Ng\u1ecdc trai; B\u1ea3n ch\u1ea5t ng\u1ecdc trai.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Ng\u1ecdc trai do m\u1ed9t lo\u1ea1i s\u00f2 ng\u1ecdc ti\u1ebft ra trong qu\u00e1 tr\u00ecnh sinh tr\u01b0\u1edfng. Khi c\u00f3 c\u00e1c h\u1ea1t c\u00e1t, k\u00fd sinh tr\u00f9ng ho\u1eb7c d\u1ecb v\u1eadt b\u1ea5t k\u1ef3, ng\u1eabu nhi\u00ean l\u1ecdt v\u00e0o trong v\u1ecf s\u00f2, con s\u00f2 l\u1eadp t\u1ee9c s\u1ebd ti\u1ebft ra c\u00e1c h\u1ee3p ch\u1ea5t protein v\u00e0 canxi cacbonat \u0111\u1ec3 bao b\u1ecdc h\u1ea1t c\u00e1t, d\u1ecb v\u1eadt. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[8,15],"tags":[],"class_list":["post-7783","post","type-post","status-publish","format-standard","hentry","category-hoa-hoc","category-hoi-dap-khoa-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7783"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7783\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}