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True or false Scientists who work with human subjects have an ethical responsibility to ensure their subjects are not harmed?
True
How do microscopes help scientists study cells?
Microscopes allow scientists to magnify the image of cells, making them visible to the human eye. This enables scientists to observe cell structures, functions, and interactions in detail, aiding in the study of their biology and behavior.
What must scientists get from human subjects before a research study can be done?
consent
How do microscopes differ from electron microscopes?
The microscopes one would think of in a college or high school biology lab are optical microscopes (ie: compound and stereo microscopes) and use light and glass optics in the eyepieces and objective lenses to obtain higher levels of magnification than the human eye can achieve. An electron microscope uses a beam of, you guessed it, electrons to illuminate and produce a magnified image. Electron microscopes are used when the specimens are too small for optical microscopes as they have wavelengths around 100,000 times shorter than visible light and can achieve magnification levels of up to 10,000,000x.
Can SEM microscopes view living cells?
SEM microscopes cannot view living cells because they require a high vacuum environment to operate, which would cause the cells to dehydrate and die. For viewing living cells, scientists typically use other techniques such as light microscopy or confocal microscopy that can be performed under conditions that keep the cells alive.
How have microscopes aided scientific discovery?
Microscopes allow us to see things that are not visible to the unaided human eye. Early microscopes allowed humans to see characteristics of blood, for instance. They also allowed people to see the structure of cells. As technology advanced, scientists developed electron microscopes, which then allowed us to see thing at an atomic level. It is actually possible for us to see electrons moving through a computer shift register! I saw a demonstration of this many years ago! I believe it was done by Hewlett Packard,Texas Instruments, or IBM.
What instrument helped scientist develop the cell theory?
As microscopes improved, so did the understanding of the human body. But the real breakthrough came from the creation of the electron microscope in 1931. The electron microscope was capable of creating magnifications of up to 2,000,000x.
Which types of microscopes can produce three-dimensional images of cells?
Types of microscopes that can produce three-dimensional images of cells include confocal microscopes, two-photon microscopes, and light sheet microscopes. These microscopes use advanced imaging techniques such as optical sectioning and 3D reconstruction to generate detailed, three-dimensional images of cells.
Why are electron microscopes capable of revealing details much smaller that those seem through light microscope?
The resolving power of a microscope is a linear function of the wavelength - An optical microscope's wavelength is that of light, and the electron microscope's - that of vibrating electrons. As the electron microscope's wavelength is about 100,000 times smaller than that of light, we get a much better resolving power.
Why were microscopes made?
Microscopes were made to allow scientists to see and study objects at a very small scale that are otherwise invisible to the naked eye. This has enabled major advancements in fields such as biology, medicine, chemistry, and materials science.
How can an electron scanning microscope be used to extend human abilities and precision?
An electron scanning microscope can be used to study objects at a nanoscale level, providing detailed information that is not visible with the naked eye. This can help enhance our understanding of biological processes, develop new materials and technologies, and improve precision in fields such as medicine and engineering. By allowing us to see and manipulate matter at a nanometer level, electron scanning microscopes can expand human capabilities in research, innovation, and problem-solving.
What is the magnification of the Transmission electron microscopes?
TEMs have a smallest resolvable separation distance (resolution) of about 0.5 nanometres, which is slightly above the atomic level of matter. By contrast, a light microscope has a resolution of up to 0.2 micrometres, and the human eye can see down to 100 micrometres.
