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您當(dāng)前的位置：首頁 > 公司動(dòng)態(tài) > 圖像流式細(xì)胞儀主要由四個(gè)部分組成圖像流式細(xì)胞儀主要由四個(gè)部分組成
發(fā)布時(shí)間： 2021-06-26 點(diǎn)擊次數(shù)： 1055次圖像流式細(xì)胞儀是對(duì)細(xì)胞進(jìn)行自動(dòng)分析和分選的裝置。它可以快速測量、存貯、顯示懸浮在液體中的分散細(xì)胞的一系列重要的生物物理、生物化學(xué)方面的特征參量，并可以根據(jù)預(yù)選的參量范圍把細(xì)胞亞群從中分選出來。多數(shù)流式細(xì)胞計(jì)是一種零分辨率的儀器，它只能測量一個(gè)細(xì)胞的諸如總核酸量，總蛋白量等指標(biāo)，而不能鑒別和測出某一特定部位的核酸或蛋白的多少。也就是說，它的細(xì)節(jié) 分辨率為零。本儀器主要由四部分組成。分別是流動(dòng)室和液流系統(tǒng)；激光源和光學(xué)系統(tǒng)；光電管和檢測系統(tǒng)；計(jì)算機(jī)和分析系統(tǒng)。1、流動(dòng)室和液流系統(tǒng)：流動(dòng)室由樣品管、鞘液管和噴嘴等組成，常用光學(xué)玻璃、石英等透明、穩(wěn)定的材料制作。設(shè)計(jì)和制作均很精細(xì)，是液流系統(tǒng)的心臟。樣品管貯放樣品，單個(gè)細(xì)胞懸液在液流壓力作用下從樣品管射出；鞘液由鞘液管從四周流向噴孔，包圍在樣品外周后從噴嘴射出。2、激光源和光學(xué)系統(tǒng)：經(jīng)特異熒光染色的細(xì)胞需要合適的光源照射激發(fā)才能發(fā)出熒光供收集檢測。常用的光源有弧光燈和激光；激光器又以氬離子激光器為普遍，也有配和氪離子激光器或染料激光器。光源的選擇主要根據(jù)被激發(fā)物質(zhì)的激發(fā)光譜而定。3、光電管和檢測系統(tǒng)：經(jīng)熒光染色的細(xì)胞受合適的光激發(fā)后所產(chǎn)生的熒光是通過光電轉(zhuǎn)換器轉(zhuǎn)變成電信號(hào)而進(jìn)行測量的。光電倍增管（PMT）最為常用。PMT的響應(yīng)時(shí)間短，僅為ns數(shù)量級(jí)；光譜響應(yīng)特性好，在200～900nm的光譜區(qū)，光量子產(chǎn)額都比較高。光電倍增管的增益從10到10可連續(xù)調(diào)節(jié)，因此對(duì)弱光測量十分有利。光電管運(yùn)行時(shí)特別要注意穩(wěn)定性問題，工作電壓要十分穩(wěn)定，工作電流及功率不能太大。4、計(jì)算機(jī)和分析系統(tǒng)：經(jīng)放大后的電信號(hào)被送往計(jì)算機(jī)分析器。多道的道數(shù)是和電信號(hào)的脈沖高度相對(duì)應(yīng)的，也是和光信號(hào)的強(qiáng)弱相關(guān)的。對(duì)應(yīng)道數(shù)年縱坐標(biāo)通常代表發(fā)出該信號(hào)的細(xì)胞相對(duì)數(shù)目。多道分析器出來的信號(hào)再經(jīng)模-數(shù)轉(zhuǎn)換器輸往微機(jī)處理器編成數(shù)據(jù)文件，或存貯于計(jì)算機(jī)的硬盤和軟盤上，或存于儀器內(nèi)以備調(diào)用。計(jì)算機(jī)的存貯容量較大，可存貯同一細(xì)胞的6～8個(gè)參數(shù)。
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