99久久国产综合毛片_午夜国产密臀日韩av片免费_亚洲a级成人毛片免费高清无码视频_久久香蕉A级毛片_色欲AⅤ精品无码一区二区pro_再深点灬舒服灬受不了了视频_老鸭窝AV在线永久免费观看_少妇影院无码_不卡无码人妻中文字幕

上海安譜實驗科技股份有限...

查看電話 在線咨詢

立即詢價

您提交后，專屬客服將第一時間為您服務(wù)

點擊提交代表您同意《用戶服務(wù)協(xié)議》《隱私政策》

Uptake Pathway, Translocation, and Isomerization of Hexabromocyclododecane Diastereoisomers by Wheat

閱讀：413 發(fā)布時間：2018-03-01

To study the uptake pathways of 3 main hexabromocyclododecane diastereoisomers (α-, β-, and γ- HBCDs) in wheat, four closed chambers were designed to expose wheat to HBCDs via air and/or soil for 4 weeks. The results showed that HBCDs could be absorbed by wheat both via root from soil and via leaf from air. The Rt values (ratio of HBCDs from root-to-leaf translocation to the total accumulation in leaves) ranging from 14.4 to 29.8% suggested that acropetal translocation within wheat was limited. A negative linear relationship was found between log Rt and log Kow of the HBCD diastereoisomers (p < 0.05). The bioconcentration factors (BCFs, (μg/g wheat tissues)/ (μg/g soil)) were in the order α- > β- > γ-HBCD in wheat roots and stems, being negatively related to their Kow values. No such correlation was found in leaves, where the HBCDs came mainly from air distribution. The results of enantiomeric fractions indicated that the (?)-enantiomer of α- and γ-HBCDs and the (+)-β-enantiomer were selectively accumulated. Furthermore, β- and γ-HBCDs were transformed to α-HBCD in the wheat, with 0.309?4.80% and 0.920?8.40% bioisomerization efficiencies at the end of the experiment, respectively, being the highest in leaves. Additionally, no isomerization product from α-HBCD was found.（研究小麥中3種對映體六溴環(huán)十二烷二體異構(gòu)物的吸收途徑,結(jié)果顯示HBCDs能通過根從土壤中和通過葉子從空氣中吸收。Rt值從14.4到29.8%說明小麥的頂葉易位是有限的。在HBCDs的非對映體發(fā)現(xiàn)了logRt和logKow 的負(fù)線性關(guān)系。在葉子中沒有發(fā)現(xiàn)這種相關(guān)性,hbcd主要來自于空氣傳播。對映體的比例說明對映體α-&γ-HBCDs和β-HBCDs是有選擇性積累的,而且小麥中β-and γ-HBCDs可以轉(zhuǎn)換成α-HBCDs）

提供商	上海安譜實驗科技股份有限公司	下載次數(shù)	75次
資料大小	2MB	資料類型	PDF 文件免費下載該資料
資料圖片	--	瀏覽次數(shù)	413次

亚洲精品综合日韩中文字幕网站_精品综合久久久久97_中文在线天堂网www_久久精品免费一区二区三区_91久久国产综合精品女同国语_久久资源总站在线国产成人

Uptake Pathway, Translocation, and Isomerization of Hexabromocyclododecane Diastereoisomers by Wheat

產(chǎn)品展示

會員登錄

收藏該商鋪

提示