1樓：在扁擔崗喝咖啡的藍狐
for samples prepared from both 12 and 20 mg phospholipid,
這是一個狀語for...，prepared...是分詞作後置定語修飾修飾samples，也可以理解為是省略了which are ...的定語從句（其實分詞作後置定語都可以這樣理解）;
discrete bands (主語)
consistent with that noted for iscom matrices prepared by dialysis
（consistent with...片語作後置定語，也可以理解為省略了which are consistent...的定語從句修飾主語）（that為代詞，noted...
分詞作後置定語修飾that；關於that代指什麼，不是指discrete bands，可能是指前文的某個名詞，這個名詞是因 免疫刺激複合物母體而得名的；noted for...因...而著名）
were observed upon （謂語）centrifugation（賓語） through a sucrose gradient（狀語）.
個人解讀 供你參考 歡迎交流
2樓：匿名使用者
noted for 所記錄下來的，所觀察到的
for samples prepared from both 12 and 20 mg phospholipid, 介詞短語作狀語
discrete bands 主語
consistent with that noted for iscom matrices 形容詞作主語的後置定語，其中 that 指代 discrete bands；noted for iscom matrices是分詞作 that (discrete bands) 的後置定語
prepared by dialysis 分詞作iscom matrices 的後置定語
were observed 謂語，被動語態
upon centrifugation through a sucrose gradient 狀語
全句：對於取自12毫克和20毫克磷脂的樣本，通過蔗糖梯度離心（技術）觀察到了與通過透析取得iscom母體時所觀察到的分立帶一致的分立帶。