亚洲综合无码久久精品综合_国产SUV精品一区二区6_成人精品玖玖资源在线播放

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

點擊提交代表您同意《用戶服務協議》《隱私政策》

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

閱讀：428 發布時間：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種對映體六溴環十二烷二體異構物的吸收途徑,結果顯示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的非對映體發現了logRt和logKow 的負線性關系。在葉子中沒有發現這種相關性,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	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	428次

性做久久久久久坡多野结衣-性做久久久久久久久浪潮-性欲影院-性影院-国产精品线路一线路二-国产精品兄妹在线观看麻豆

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

產品展示

會員登錄

收藏該商鋪

提示