新手在膜片鉗電生理實(shí)驗(yàn)中,往往被封接與破膜這兩道關(guān)卡困擾,如同置身于迷霧重重的森林,不知所措。
封接階段就像是一場(chǎng)微觀的舞蹈,需要微妙的平衡。新手往往在尋找和建立液-液界面時(shí)感到困惑,電極與細(xì)胞膜的接觸,既要接近,又不能過(guò)于猛烈,否則會(huì)損傷細(xì)胞,破壞實(shí)驗(yàn)的完整性。
破膜,是一場(chǎng)對(duì)力與美的精準(zhǔn)把控。在封接的基礎(chǔ)上,實(shí)驗(yàn)者需要用負(fù)壓輕輕擾動(dòng)細(xì)胞膜,使它在電極附近形成一個(gè)直徑約為1微米的小孔。這不僅是對(duì)物理力量的微妙調(diào)節(jié),更是對(duì)時(shí)機(jī)的精準(zhǔn)掌握。過(guò)猶不及,力度過(guò)大,細(xì)胞膜可能被撕裂,導(dǎo)致記錄的混亂;力量過(guò)小,則可能無(wú)法形成有效的通道,讓實(shí)驗(yàn)前功盡棄。這種“拿捏”的藝術(shù),像極了芭蕾舞者在舞臺(tái)上的一次輕盈跳躍,只有在恰當(dāng)?shù)牧Χ群蜁r(shí)機(jī),才能綻放出最美的姿態(tài)。
現(xiàn)在,有一款產(chǎn)品,可以幫助您輕松解決封接、破膜問(wèn)題,讓封接破膜不再成為新手膜片鉗實(shí)驗(yàn)的攔路虎。
它就是
ez-gSEAL 100B破膜儀
與傳統(tǒng)的密封方法相比,使用ez-gSEAL破膜儀有許多優(yōu)點(diǎn):
1、可以在實(shí)驗(yàn)期間設(shè)置非常小的壓力,使封接持續(xù)很長(zhǎng)時(shí)間;
2、量化了壓力大小,使破膜過(guò)程變得精確且可重復(fù);
3、操作簡(jiǎn)單,一鍵封接,一鍵破膜,提高工作效率;
4、任何人都可以短時(shí)間內(nèi)輕松實(shí)現(xiàn)封接破膜;
主要功能
1、ez-gSEAL破膜儀可輕松實(shí)現(xiàn)膜片鉗。復(fù)雜的膜片鉗實(shí)驗(yàn)變得像點(diǎn)擊幾下按鈕一樣簡(jiǎn)單。單擊第一個(gè)按鈕設(shè)置正壓,第二個(gè)按鈕設(shè)置負(fù)壓以設(shè)置封接,第三個(gè)按鈕設(shè)置保壓。通過(guò)單擊一個(gè)按鈕,您可以應(yīng)用脈沖進(jìn)入細(xì)胞。
2、ez-gSEAL 100B破膜儀主要用于膜片鉗自動(dòng)封接,也可用于其他應(yīng)用。使用ez-gSEAL破膜儀,細(xì)胞封接就像點(diǎn)擊一個(gè)按鈕一樣簡(jiǎn)單。
3、 軟件控制的破膜儀配有空氣壓縮泵,無(wú)需氣瓶。
4、升級(jí)型號(hào)ez-gSEAL 100B破膜儀泵功率更大,使用壽命更長(zhǎng),設(shè)備內(nèi)的氣流得到改善,性能更佳,并配有壓力表幫助用戶確定用于正負(fù)壓壓力實(shí)時(shí)監(jiān)測(cè)。
5、ez-gSEAL控制軟件:NBSController控制壓力應(yīng)用并測(cè)量壓力。 常用的壓力可以預(yù)先設(shè)定,因此用戶可以點(diǎn)擊幾個(gè)按鈕進(jìn)行密封和破膜。
ez-gSEAL破膜儀可由iPod Touch,iPhone或iPAD控制。 iPod Touch通過(guò)WiFi連接到服務(wù)器軟件NBSController,因此您可以使用iPod Touch作為遙控器來(lái)控制設(shè)備的設(shè)備。
來(lái)自研究實(shí)驗(yàn)室的數(shù)據(jù)
Figure 1 Recording obtained at the Marine Biological Laboratory using the ez-gSEAL 100A pressure controller. LNV clock neurons in female Drosophila were used for electrophysiological recordings. A 6-7 micrometer diameter pipette filled with protease XIV was first used to digest the tissue above the clock neurons. The pressure setting for applying the protease XIV was 20 - 30 mmHg. When making the seal, 40 mmHg pressure was applied during the time the patch pipette (polished. Resistance ~ 17 MOhms) approached the neuron, and then -20 mmHg suction was applied to make the seal. The breaking-in pressure for this cell was -200 to -250 mmHg for 0.5 s. The holding pressure was 1 mmHg to keep the seal stable during the recording. This recording was obtained 3.5 hours after making the seal, and the cell was still healthy. Faculties: Dr. Guan Cao, University of Texas; Dr. Michael Nitaback, Yale University.
Reference: Guan Cao and Michael N. Nitabach (2008) J. Neurosci., 28(25):6493-6501
Figure 2 Suspension of HEK cells expressing ClC-0/C212S chloride channels. When making the seal, 5 mmHg pressure was applied during the time the patch pipette (Resistance ~ 2 MOhms) approached the cell, and then -40 mmHg suction was applied to make the seal.
Obtained from Dr. Xiaodong Zhang and Dr. Tsung-Yu Chen, University of California, Davis.
技術(shù)指標(biāo)
1、壓力范圍:-250 mmHg至250 mmHg
2、壓力分辨率:+/- 1.5 mmHg
3、最小脈沖持續(xù)時(shí)間7毫秒
4、最小脈沖間隔7毫秒
5、電腦界面USB
6、電壓:110 VAC至240 VAC
7、尺寸17“x14”x3.5“機(jī)架或桌面
8、重量10磅
計(jì)算機(jī)要求
具有2.0 GHz CPU的32位Windows 2000,XP,Vista,Windows8或10系統(tǒng),1個(gè)USB端口。
來(lái)看一看我們實(shí)驗(yàn)室操作情況吧
最后,給大家推薦幾組軟件設(shè)置參數(shù),供大家參考。
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