臍帶是哺乳類的連接胎兒和胎盤的管狀結構,由兩條動脈和一條靜脈構成。臍帶呈圓柱狀結構,內(nèi)有兩條臍動脈及一條臍靜脈。臍帶內(nèi)有一條臍靜脈,接受從母體來的新鮮血液并流經(jīng)胎兒全身回到胎兒的動脈系統(tǒng),最后進入兩條臍動脈流入胎盤至母體,這是胎兒血循環(huán)的特點之一。胎兒藉以生存的營養(yǎng)物質(zhì)如電解質(zhì)、無機鹽、激素、微量元素、免疫抗體等,均需經(jīng)過臍帶傳送。
臍帶也一直是科研人員競相研究的一塊領域,例如臍帶間充質(zhì)干細胞,它聯(lián)合造血干細胞移植可發(fā)揮強大的造血支持能力。科學家發(fā)現(xiàn)間充質(zhì)干細胞具有調(diào)節(jié)免疫的作用,有著廣泛的臨床應用前景。它可以改善骨髓造血微環(huán)境,促進造血干細胞的植入,顯著加快移植后的造血重建,安全且并發(fā)癥少。同時,適量的間充質(zhì)干細胞在造血干細胞移植中,可以降低移植物抗宿主病的發(fā)生率和嚴重程度。
山東銀豐生物集團就利用上海凈信浸入式液氮冷凍研磨儀研磨臍帶,提取RNA。凈信便攜式液氮冷凍研磨儀功能強大,是世界上技術領先的液氮冷凍研磨設備,全過程超低溫運行,是市場上公認的高效的研磨設備:其冷凍研磨方法是一種先進的、高效的、方便的樣品處理方法,可以處理常規(guī)方法難以處理的樣品,如:塑料、橡膠、樹脂、皮革、毛發(fā)、骨骼、木材、紡織原料等等,被稱為研磨的終極手段。液氮冷凍研磨儀應用領域廣泛,如生物化學中的RNA/DNA檢測、聚合物結構分析、痕跡元素的判斷、食品分析、礦物質(zhì)研究、醫(yī)療外科手術的輔助、藥品性能的檢測、紡織品組成成分的鑒定等等。
冷凍組織研磨儀
實驗目的:通過研磨臍帶組織,提取RNA
實驗材料和器具:
樣品:臍帶組織
工具:凈信全自動樣品快速研磨儀
耗材:專用研磨罐,液氮、剪刀、鑷子等
實驗步驟:
1、準備研磨罐和樣品;
2、取組織剪成小塊放入研磨罐中,將蓋子蓋緊;
3、將研磨罐置于裝有液氮的容器內(nèi),液氮容量沒過研磨罐冷凍幾分鐘,取出時戴手套或使用鑷子夾取避免液氮凍傷;
4、首先將適配器放入研磨儀中固定,然后在將研磨罐放置適合器內(nèi),以保證研磨時的受力平衡,旋緊垂直定位螺旋,將安全鎖扣緊。
5、設置參數(shù)啟動程序結束后即可得到破碎粉末;
6、研磨完畢后請關閉電源,將安全鎖歸位;
7、完成后續(xù)RNA提取步驟。
實驗解決的問題:
1、儀器研磨相對手工研磨速度更快,縮短整體實驗時間;
2、儀器研磨出料顆粒均勻、細膩,無需過篩,可直接進行下一步提取工作;
3、避免樣品污染與浪費
實驗過程、結果圖示:
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