Microscope

Microscope
1852 microscope
A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye.
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Because resolution (the ability to distinguish adjacent objects as separate) is better and magnification 1,000 times that of an optical light microscope is possible, electron microscopy can help determine the nature of tumors and of kidney disease.
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Microscopes are important tools for studying cellular structures. In this class we will use light microscopes for our laboratory observations.
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A microscope that focuses an electron beam through a specimen, resulting in resolving power a thousandfold greater than that of a light microscope.
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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.
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light microscope The type of microscope in which the specimen is viewed under ordinary illumination.
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Unit 12: Microscope
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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.
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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.
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1590 AD The microscope is invented by Zacharias Janssen.
1675 AD Microorganisms discovered (using first microscope)
1856 AD Gregor Mendel discovered the laws of inheritance ...
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Today this is an arduous process, requiring manual manipulation of molecules using such devices as a scanning tunneling microscope. Eventually it is expected to exploit life-like self-replicating 'helper molecules' that are themselves engineered.
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For most of the life of the cell, chromosomes are too elongated and tenuous to be seen under a microscope.
Before a cell gets ready to divide by mitosis, each chromosome is duplicated (during S phase of the cell cycle).
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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.
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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.
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They have about 1000 chromatids; produced by DNA replication without mitosis. When viewed under a microscope, the many chromatids look like a giant chromosome.
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so small that it is beyond the microscope
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microfossil -- n. A very small fossil, best studied with the aid of a microscope, e.g. foraminifera, radiolarians, and small vertebrate fossils such as teeth. macrofossil- ant.
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The base pairing of a sequence of DNA to metaphase chromosomes on a microscope slide.
explained:
Listen to a detailed explanation.
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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.
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The erroneous wear pattern on the molars, which was obvious when Weiner looked at the casts, was never noticed. Nor were they carefully examined under a microscope -- the abrasion marks would have been seen.
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