Science Lab
Science Lab
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Improvement of Metallic Thin Films for HR-SEM by Using DC Magnetron Sputter Coater
Preparation techniques, like several kinds of coating methods play an important role for high resolution scanning electron microscopy (HR-SEM). Nonconductive sample like biological and synthetic…
Immersion Freezing for Cryo-Transmission Electron Microscopy: Applications
A well established usage case for cryo-TEM is three-dimensional reconstruction of isolated macromolecules, virus particles, or filaments. On one hand, these approaches are based on averaging of…
Immersion Freezing for Cryo-Transmission Electron Microscopy: Fundamentals
The high vacuum required in a transmission electron microscope (TEM) greatly impairs the ability to study specimens naturally occurring in an aqueous phase: exposing "wet" specimens to a pressure…
Video Tutorials: Filling and Assembling of Different Carriers for High-Pressure Freezing
High pressure freezing (HPF) is a cryo-fixation method primarily for biological samples, but also for a variety of non-biological materials. It is a technique that yields optimal preservation in many…
Brief Introduction to Freeze Fracture and Etching
Freeze fracture describes the technique of breaking a frozen specimen to reveal internal structures. Freeze etching is the sublimation of surface ice under vacuum to reveal details of the fractured…
Brief Introduction to Specimen Trimming
Before ultrathin sectioning a sample with an ultramicrotome it has to be pre-prepared. For this pre-preparation, special attention must be paid to the sample size (size of the section), location of…
Glycerol Spraying/Platinum Low Angle Rotary Shadowing of DNA with the Leica EM ACE600 e-beam
Glycerol spraying/low angle rotary shadowing (Aebi and Baschong, 2006) is a preparation technique used in biology to visualize structures yielding insufficent contrast with other techniques, due to…
Brief Introduction to Freeze Substitution
Freeze-substitution is a process of dehydration, performed at temperatures low enough to avoid the formation of ice crystals and to circumvent the damaging effects observed after ambient-temperature…
Thermodynamic Considerations Regarding the LN2 in a High Pressure Freezer
Employing liquid nitrogen (LN2) as a coolant in the complex process of high pressure freezing raises certain considerations regarding phase transition not only of the liquid sample to be frozen but…
