TRANSMISSION ELECTRON MICROSCOPY (TEM)
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Transmission electron microscopy (TEM) uses an electron beam to observe very small specimens. It was developed in 1931 and is commonly used globally in science and engineering. TEM has three main parts: an electron gun, condenser system, and image producing and recording systems. It can magnify up to 2 million times and is used for applications ranging from biology to nanotechnology. While powerful, TEMs are also expensive, large, require significant maintenance, and have a tedious specimen preparation process.
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The document discusses the principles and workings of transmission electron microscopes (TEM). Key points:
- TEMs use electron beams instead of light to achieve much higher magnifications, allowing observation of objects as small as 0.2 nm.
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- TEMs use electron beams instead of light to achieve much higher magnifications, allowing observation of objects as small as 0.2 nm.
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1. The document discusses the use of nanotechnology in various medical applications including drug discovery, delivery, and tissue engineering.
2. Nanoparticles, nanotubes, and other nanostructures are being used to develop more targeted drug therapies and more effective medical implants and devices.
3. Nanotechnology is also discussed as having applications in surgery, diagnostics, and cancer treatment by enabling earlier detection and more precise interventions.
Tem ppt
Transmission electron microscopy allows the study of inner structures at a very fine scale. It has powerful magnification and resolution, providing high-quality, detailed images. However, TEMs are large, expensive machines that require specialized training to operate and maintain. They also require laborious sample preparation and can only image electron-transparent samples. In medicine, TEM is used as a diagnostic tool in renal biopsies and cancer research to study tumor cell ultrastructure. It also helps toxicology research on the impacts of pollution.
1.1 Enrichment
The document discusses recent advances in microscopy techniques. A new transmission positron microscope uses positrons instead of electrons to image specimens, avoiding the damage caused by electron beams. An acoustic microscope uses sound waves rather than atomic particles, allowing it to image living cells without harming them. These new microscopes allow scientists to directly observe living biological specimens and cells, improving understanding of cellular structure and function.
Laporan Praktikum Biologi Dasar - How to use the microscope
The document provides instructions for using a microscope correctly and safely. It was a report from a biology practicum conducted by Nur Pratiwi. The practicum taught students how to use microscopes to observe the smallest structures of organisms. It covered preparing the microscope, controlling the light, adjusting the lens distance, making simple microscope slides, and changing magnifications. The goal was for students to learn proper microscope procedures.
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4.1.1 microscopy - Class 9 - Textbook of Biology - FBISE Islamabad
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Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
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Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
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https://ashpc.eu/
Deep Software Variability and Frictionless Reproducibility
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Exposé invité Journées Nationales du GDR GPL 2024
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3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
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Equivariant neural networks and representation theory
Or: Beyond linear.
Abstract: Equivariant neural networks are neural networks that incorporate symmetries. The nonlinear activation functions in these networks result in interesting nonlinear equivariant maps between simple representations, and motivate the key player of this talk: piecewise linear representation theory.
Disclaimer: No one is perfect, so please mind that there might be mistakes and typos.
dtubbenhauer@gmail.com
Corrected slides: dtubbenhauer.com/talks.html
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TRANSMISSION ELECTRON MICROSCOPY (TEM)
- 3. Jens Martensson 3 INTRODUCTION: It is a one type of electron microscopy. Transmission electron microscopy (TEM) is a technique used to observe the features of very small specimens. The technology uses an accelerated beam of electrons, which passes through a very thin specimen to enable a scientist the observe features such as structure and morphology. The technology was first developed by German scientists Max Knoll and Ernst Ruska in 1931 and has evolved over the years to become a common technique that is used globally in science and engineering to look at micro and nanoparticles.
- 4. Jens Martensson 4 It has three main parts. They are, 1. An Electron gun 2.The condenser system 3.Image producing system 4.Image recording system PARTS OF TEM Transmission Electron Microscope Electron gun
- 5. Jens Martensson 5 1. Electron gun- To produce the electrons. 2. Image producing system- Its made up of the objective lens, a movable stage or holding the specimen, intermediate and projector lenses. They function by focusing the passing electrons through the specimen forming a highly magnified image. 3. Image recording system-Its made up of the fluorescent screen used to view and to focus on the image. They also have a digital camera that permanently records the images captured after viewing.
- 6. Jens Martensson 6 APPLICATION: 1.It can be used in various industries from medical research where it is employed to investigate viruses and bacteria, for example, to forensic science, gemology and materials science. 2.To visualize and study cell structures of bacteria, viruses, and fungi 3.To view bacteria flagella and plasmids 4.To view the shapes and sizes of microbial cell organelles 5.To study and differentiate between plant and animal cells. 6.Its also used in nanotechnology to study nanoparticles such as ZnO nanoparticles 7.It is used to detect and identify fractures, damaged micro particles which further enable repair mechanisms of the particles.
- 7. Jens Martensson 7 ADVANTAGES: 1.It has a very powerful magnification of about 2 million times that of the Light microscope. 2.It can be used for a variety of applications ranging from basic Biology to Nanotechnology, to education and industrial uses. 3.It can be used to acquire vast information on compounds and their structures. 4.It produces very efficient, high-quality images with high clarity. 5.It can produce permanent images. 6.It is easy to train and use the Transmission Electron Microscope.
- 8. Jens Martensson 8 DISADVANTAGES: 1.Very expensive to purchase. 2. They are very big to handle. 3.They are laborious to maintain. 4.It requires a constant inflow of voltage to operate. 5.The preparation of specimens to be viewed under the TEM is very tedious. 6.It requires a constant inflow of voltage to operate.