Microscope
From Wikipedia, the free encyclopedia
Jump to: navigation, search ...
*Antonie van Leeuwenhoek used these droplets as microscope lenses to view the animalcules he found in water. Despite their crude nature, those early lenses enabled van Leeuwenhoek to describe an amazing world of microscopic life.
New Microscope Offers First Views of Living Cells in Action
In July 2001, researcher Robert Wind (Pacific Northwest National Laboratory, PNNL) accepted the top innovation award in Discover Magazine's health category.
light microscope (LM)
An optical instrument with lenses that refract (bend) visible light to magnify images of specimens.
light reactions ...
Microscopes are important tools for studying cellular structures. In this class we will use light microscopes for our laboratory observations.
light microscope The type of microscope in which the specimen is viewed under ordinary illumination.
prepare microscope slide with cells in metaphase of mitosis, treat slide with a weak base. Thus denaturing the dna. Pour radioactively labelled probe onto the slide. Expose slide to photographic emulsion for a few days or weeks. Develop emulsion.
Electron microscope image of TMV
Several EM images and schematic drawings
Images of the TMV coat protein
'"/ ...
Electron microscope A powerful microscope that uses beams of fast-moving electrons instead of light to magnify samples. Powerful magnets focus the electrons into an image.
Through the microscope, the nucleolus appears like a large dark spot within the nucleus (see Figure 2). Eukaryotic cells often contain a single nucleolus, but several are also possible.
ATOMIC-FORCE MICROSCOPE
A type of scanning-probe microscope, in which a fine needle attached to the tip of a soft cantilever scans the surface of a specimen.
Calling all Microscopes
As with all of science, discovery in biology is a huge thing. While microbes like bacteria, fungi, some algae, and protozoa have always existed, scientists did not always know they were there.
Years later, as microscopes improved, other biologists were able to continue the work of Hooke and Leeuwenhoek, learning more about cells. German Biologist Matthias Schleiden discovered that every part of a plant he looked at was made of cells.
scanning electron microscope (SEM) -- n. A special kind of microscope that scans samples with a high-energy beam of electrons to produce a high-resolution, detailed, three-dimensional image.
History of the Light Microscope
Discovery, Chance and the Scientific Method Read an case study, in a way, of how to apply the scientific method. This page was developed for the Access Excellence site.
In a fluorescence microscope, you see only what you illuminate. Just like at night, you shine your lights at something, and whatever is in that light beam, you see. So with a fluorescence microscope, you illuminate something before you can see it.
If the web of a living frog's foot be spread out and examined under the microscope the blood is seen to flow in a continuous stream through the vessels, and the corpuscles show no tendency to adhere to each other or to the wall of the vessel.
Electron microscope
electron microscopy
electron pair geometry
electron transfer
Electron transfer protein
electron transport chain
Electron-nuclear double resonance
electronegativity
Electronic fetal monitoring
electrophoresis ...
Until the invention of the electron microscope little was known about the cell organelles which are too small to be resolved in the light microscope. The most prominent organelle is the nucleus which contains the unwound chromosomes.
Viruses are submicroscopic, which means that you cannot see them in the microscope. What's interesting about viruses is that they have two or three components.
objects that under the scanning electron microscope look like fossils of tiny microorganisms. However, even the largest of these "nanofossils" have diameters of only 100 nanometers (nm) (0.1 µm, about the size of a ribosome).
During mitosis, the 23 pairs of human chromosomes condense and are visible with a light microscope. A karyotype analysis usually involves blocking cells in mitosis and staining the condensed chromosomes with Giemsa dye.
Microbes are extremely small organisms that cannot be see without a microscope. Microbes are all around us. They can survive under some of the most extreme conditions, they are sometimes harmful to us, and they are essential to our survival.
For example, to a botanist working with angiosperms ordinary means might mean a hand lens; to an entomologist working with beetles it might mean a dissecting microscope; ...
Biology began to quickly develop and grow with Antony van Leeuwenhoek's dramatic improvement of the microscope. It was then that scholars discovered spermatozoa, bacteria, infusoria and the sheer strangeness and diversity of microscopic life.
light source found at the base of the microscope.
imprinting
an aspect of learning in which there is rapid development of a response to a particular stimulus at an early stage of development.
Micro array A large number of objects immobilised in a rectangular array on a microscope slide. The objects may be oligonucleotides, DNA from cDNA clones or fragments of genomic DNA.
- A large set of cloned DNA molecules spotted onto a solid matrix (such as a microscope slide) for use in probing a biological sample to determine gene expression, marker pattern or nucleotide sequence of DNA/RNA. Also known as the DNA Chip.
Thousands of probe DNAs are spotted or synthesized on microscope slides. Sample RNAs are labeled with fluorescent dyes. Gene expression levels in the sample are detected by hybridization of the labeled RNAs to the probes on the slide.
They have about 1000 chromatids; produced by DNA replication without mitosis. When viewed under a microscope, the many chromatids look like a giant chromosome.
T Phages: A phage which infects Escherichia coli. Viral parasites of this type are labeled T1 through T7. T2 was the first phage observed under the electron microscope.
Thymine: A nitrogenous base. Pairs with adenine in DNA molecules.
Chromosomes of amphibian oocytes having loops suggestive of a lampbrush. Large chromosomes found in amphibian eggs, with lateral DNA loops, extending from chromomeres, producing a brushlike appearance under the microscope.
The slides are put into a scanning microscope that can measure the brightness of each fluorescent dot; brightness reveals how much of a specific DNA fragment is present, an indicator of how active it is. [Talking Glossary] ...
 See also: Cells, Cell, Organ, Protein, Trans
|
