X - xanthophyll 中文 - EN166

xanthophyll n.【植物；植物學】黃色素，葉黃素。

xanthopsia
The results of changes in photochemical activity parameters and chloroplast pigments in the present study indicated that xanthophylls cycle was induced in leaves of boea hygrometrica when they were dehydrated for 8 days under very weak light condition ( 3u mol . m - 2 . s - 1 ) , xanthophylls cycle may play a photoprotective role in dehydrated boea leaves 為此本研究對牛耳草葉片光系統的光化學活性參數和葉黃素循環色素在脫水復蘇過程中的變化進行了分析，結果表明，在極微弱的光強( 3 mol m ~ ( - 2 ) s ~ ( - 1 )下，脫水8天的牛耳草葉片誘導了葉黃素循環，葉黃素循環可能介導了牛耳草葉片脫水過程中的光保護作用。
Xanthophyli cycle has been widely concerned since the finding that it has the function in heat dissipation . with the trans - thylakoid ph gradient , zeaxanthin ( z ) together with antheraxanthin ( a ) can absorb excess energy from chlorophyll and release it as heat , thus protect the photosynthetic apparatus from photodamage by high light . violaxathin de - epoxidase ( vde ) is the key enzyme in xanthophylls cycle 目前普遍認為葉黃素循環的色素定位于天線色素蛋白復合體上，在跨膜質子梯度( ph )形成后，玉米黃質( z )和環氧玉米黃質( a )能夠從葉綠素中吸收過多的激發能，并以熱能的形式耗散到體外，從而保護光合器官免受強光的破壞。
These results demonstrate that the heat dissipation ability in the transgenic plants decreases , suggesting that xanthophyll cycle has the function in photoprotection . besides , a dna minipreparation method suitable for screening and identification large amounts of transgenic plants was established . using this rapid and efficient method , one person can prepare d 另外，還建立了一種適合于篩選轉基因植株的dna微量提取法，此方法操作快捷方便，一個人在一天內能制備50多個樣品， 100mg的植物鮮樣平均可獲得40卜g的dna ，提取的dna可直接用于pcr反應、酶切分析及southern分析。
The expression quantity increased with the induction time by iptg , and accounted for 25 percent of the total proteins after 4 - hour induction . absorption spectrum together with xanthophyll pigments quantification by hplc demonstrated that the expressed vde has its enzyme activity , which can de - epoxidate v into a and z in vitro 吸收光譜差值a _ ( 502 - 540 )隨反應的進行逐漸增大，反應體系總色素的hplc分析表明， v逐漸降低，而z剛好相反，說明表達的蛋白具有與活體vde酶相同的功能，能在體外將v轉變為a和z 。
It will provide us to further study the function of xanthophyll cycle in photoprotection . the major results are as following : two cdna sequences encoding violaxanthin de - epoxidase were cloned from japonica rice ( jrvde ) and indica rice ( irvde ) with the full - length of 1887bp and 1647bp , respectively . the homology of the open reading frame is 98 % identity between two rvde genes , and more than 60 % identities with those of other species 本論文從水稻和菠菜中克隆了編碼vde酶的基因，并通過轉基因植物進一步研究了葉黃素循環在熱耗散方面的作用，主要獲得了以下結果：首次從兩個水稻亞種(秈稻和粳稻)中克隆了rvde基因(分別命名為irvde和jrvde )的全長cdna序列，分別長1647bp和1887bp ，兩者開放閱讀框的同源性為98 ，與其它已知vde基因的同源性在60以上。
The ps ii native fractions ( 20 % and 30 % ) were loaded onto a deae column . the fraction eluted with 150 mm nacl was presented dcip reduction activity and was highly depleted in chi c and xanthophylls , and as such could be considered a ps ii core complex 對于有dcip光還原活性的20和30層帶的復合物，進一步deae離子交換層析純化。 150mmnacl洗脫純化后的樣品經過熒光激發光譜測定發現，已經去除了葉綠素c和墨角藻黃素，并且仍然具有dcip的光活性，分析是ps核心復合物。
The physiological functions of some natural pigments were reviewed , some natural pigments such as carotenoid , xanthophylls , flavanones and anthocyanin were introduced on antioxidant activities , antibacterial activities and health protection 綜述了中藥色素的藥理作用，對類胡蘿卜素、黃酮類、花色苷類等色素的抗氧化活性、抗菌活性及保健功能作了簡要介紹。
Deng et al . ( 2000 ) found an obvious increase in carotenoids content in detached boea leaves during dehydration , indicating a protective role of xanthophylls cycle in dehydrated boea leaves 鄧馨等( 2000 )的研究結果發現牛耳草離體葉片在脫水過程中類胡蘿卜素的含量顯著增加，推測可能存在葉黃素循環的保護作用。
Lutein ( xanthophyll ) from the marigold flower , is a potent antioxidant that assists in general well - being 由金盞花萃取的葉黃素，是一種具有效益的抗氧化物，能夠幫助身體體的健康。
There are over 600 known carotenoids ; they are split into two classes , xanthophylls and carotenes 有超過600種已知的類胡蘿卜素，可以分為兩類：葉黃素和胡蘿卜素。
Still others have searched the world over for berries, flowers or leaves of high xanthophyll content . 還有其他人在世界各地尋找含有大量葉黃素的漿果、花或葉。