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Department of Biology, University of Waterloo
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Reed, B. H., McMillan, S. C., Chaudhary, R. The Preparation of Drosophila Embryos for Live-Imaging Using the Hanging Drop Protocol. J. Vis. Exp. (25), e1206, doi:10.3791/1206 (2009).
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我们描述了一种实时成像分析,我们称之为悬滴协议的准备果蝇胚胎的新方法。不幸的是,它是不可能的使用悬滴协议,如果倒置显微镜工作。在这种情况下,夹层技术(抽象以上所述),必须使用压缩的胚胎仍然令人担忧。
在细胞的形状和大小进行测量,以计算力量与形态运动相关的实验,使用一个堂堂正正的显微镜和悬滴协议是可取的,因为胚胎压缩减少。此外,减少胚胎压缩使用悬滴协议而夹层技术提出了一个扁平的表面呈现圆形,胚胎表面不失真的后果。当使用共聚焦显微镜,因此,有必要收集更广泛的Z - Stack(每个堆叠多个切片)时使用的夹心法与悬滴协议。然而,每片的Z - Stack数目增加,增加收购时间,以及任何照片毒性或激光激发的光漂白。显然,减少压缩实验的好处是在Z - Stack的收购时间的增加部分抵消。然而,尽管这在Z - Stack的收购时间的增加,我们观察到的优秀的生存能力使用悬滴协议的胚胎。
悬滴协议也是有限的荧光显微镜,观察胚胎,在该事件发出的光的光路不会通过现场影像室。使用DIC的显微镜或其他非荧光光学实时成像胚胎可以实现通过修改现场影像室,允许从冷凝器通过暂停胚胎一个光路。
使用悬滴技术时关注的一个问题可能是不可取的运动或胚胎timelapse收购期间领域的“漂流”。对倒盖玻片下方浮动时,我们发现,胚胎是非常稳定的,并没有使用时,无论是干式或油浸目标位置转移。多timelapse收购使用电动显微镜阶段,也不会破坏胚胎,准备使用悬滴协议的立场。任何使用悬滴技术制备的胚胎的运动可以消除通过减少卤烃滴油的大小,并确保独立的油滴不活成像室的边缘融合或沿排汗。
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我们非常感谢支持的BHR通过发现格兰特以及来自自然科学和加拿大工程研究理事会(NSERC)的一个研究工具和仪器格兰特。我们也承认H.小田和布卢明顿果蝇中心提供,例如实时成像序列的遗传股股票。
| Name | Company | Catalog Number | Comments |
| Standard equipment and materials required to prepare embryos for live-imaging using the hanging drop protocol include the following items: microscope slides | |||
| coverslips (22 x 40 mm, No. 2) | |||
| double-sided tape | |||
| jeweller’s forceps (Dumont style No. 5) | |||
| halocarbon oil series 56 and series 700 (Halocarbon Products Corp.) | |||
| a utility knife or single edge razor blade | |||
| tissue paper | |||
| scissors | |||
| distilled water | |||
| general purpose tape | |||
| a pipet suitable for delivering 20-40 l. | |||
| The live imaging protocol also requires a custom-made live imaging chamber. This is prepared by cutting a 5 mm think polycarbonate plastic sheet to the dimensions of a standard microscope slide (75 X 25 mm) and using a rotor to create a 3mm deep depression in the slide (20 X 55 mm). Access to a stereomicroscope (dissecting microscope) and a fiber-optic illumination source is also required. | |||