Contents 1 History 1.1 Rise of modern light microscopes 1.2 Electron microscopes 1.3 Scanning probe microscopes 1.4 Fluorescence microscopes 1.5 Super resolution microscopes 1.6 X-ray microscopes 2 Types 2.1 Optical 2.2 Electron 2.3 Scanning probe 2.4 Other types 3 See also 4 References 5 External links

History 18th-century microscopes from the Musée des Arts et Métiers, Paris. Further information: Timeline of microscope technology and Optical microscope § History Although objects resembling lenses date back 4000 years and there are Greek accounts of the optical properties of water-filled spheres (5th century BC) followed by many centuries of writings on optics, the earliest known use of simple microscopes (magnifying glasses) dates back to the widespread use of lenses in eyeglasses in the 13th century.[2][3][4] The earliest known examples of compound microscopes, which combine an objective lens near the specimen with an eyepiece to view a real image, appeared in Europe around 1620.[5] The inventor is unknown although many claims have been made over the years. Several revolve around the spectacle-making centers in the Netherlands including claims it was invented in 1590 by Zacharias Janssen (claim made by his son) and/or Zacharias' father, Hans Martens,[6][7] claims it was invented by their neighbor and rival spectacle maker, Hans Lippershey (who applied for the first telescope patent in 1608),[8] and claims it was invented by expatriate Cornelis Drebbel who was noted to have a version in London in 1619.[9][10] Galileo Galilei (also sometimes cited as compound microscope inventor) seems to have found after 1610 that he could close focus his telescope to view small objects and, after seeing a compound microscope built by Drebbel exhibited in Rome in 1624, built his own improved version.[11][12][13] Giovanni Faber coined the name microscope for the compound microscope Galileo submitted to the Accademia dei Lincei in 1625[14] (Galileo had called it the "occhiolino" or "little eye"). Rise of modern light microscopes Carl Zeiss binocular compound microscope, 1914 The first detailed account of the microscopic anatomy of organic tissue based on the use of a microscope did not appear until 1644, in Giambattista Odierna's L'occhio della mosca, or The Fly's Eye.[15] The microscope was still largely a novelty until the 1660s and 1670s when naturalists in Italy, the Netherlands and England began using them to study biology, both organisms and their ultrastructure. Italian scientist Marcello Malpighi, called the father of histology by some historians of biology, began his analysis of biological structures with the lungs. Robert Hooke's Micrographia had a huge impact, largely because of its impressive illustrations. A significant contribution came from Antonie van Leeuwenhoek who achieved up to 300 times magnification using a simple single lens microscope. He sandwiched a very small glass ball lens between the holes in two metal plates riveted together, and with an adjustable-by-screws needle attached to mount the specimen.[16] Then, Van Leeuwenhoek re-discovered red blood cells (after Jan Swammerdam) and spermatozoa, and helped popularise the use of microscopes to view biological ultrastructure. On 9 October 1676, van Leeuwenhoek reported the discovery of micro-organisms.[15] The performance of a light microscope depends on the quality and correct use of the condensor lens system to focus light on the specimen and the objective lens to capture the light from the specimen and form an image.[5] Early instruments were limited until this principle was fully appreciated and developed from the late 19th to very early 20th century, and until electric lamps were available as light sources. In 1893 August Köhler developed a key principle of sample illumination, Köhler illumination, which is central to achieving the theoretical limits of resolution for the light microscope. This method of sample illumination produces even lighting and overcomes the limited contrast and resolution imposed by early techniques of sample illumination. Further developments in sample illumination came from the discovery of phase contrast by Frits Zernike in 1953, and differential interference contrast illumination by Georges Nomarski in 1955; both of which allow imaging of unstained, transparent samples. Electron microscopes See also: electron microscope Electron microscope constructed by Ernst Ruska in 1933 In the early 20th century a significant alternative to the light microscope was developed, an instrument that uses a beam of electrons rather than light to generate an image. The German physicist, Ernst Ruska, working with electrical engineer Max Knoll, developed the first prototype electron microscope in 1931, a transmission electron microscope (TEM). The transmission electron microscope works on similar principles to an optical microscope but uses electrons in the place of light and electromagnets in the place of glass lenses. Use of electrons, instead of light, allows for much higher resolution. Development of the transmission electron microscope was quickly followed in 1935 by the development of the scanning electron microscope by Max Knoll.[17] Although TEMs were being used for research before WWII, and became popular afterwards, the SEM was not commercially available until 1965. Transmission electron microscopes became popular following the Second World War. Ernst Ruska, working at Siemens, developed the first commercial transmission electron microscope and, in the 1950s, major scientific conferences on electron microscopy started being held. In 1965, the first commercial scanning electron microscope was developed by Professor Sir Charles Oatley and his postgraduate student Gary Stewart, and marketed by the Cambridge Instrument Company as the "Stereoscan". One of the latest discoveries made about using an electron microscope, is the ability to identify a virus.[18] Since this microscope reflects a visible, clear image of small organelles, then in an electron microscope there will no need for reagents to see the virus or harmful cells, resulting with more efficient way for pathogen detection. Scanning probe microscopes See also: scanning probe microscope From 1981 to 1983 Gerd Binnig and Heinrich Rohrer worked at IBM in Zurich, Switzerland to study the quantum tunnelling phenomenon and eventually create a practical instrument, a scanning probe microscope from quantum tunnelling theory that read very small forces exchanged between a probe and the surface of a sample. The probe almost meets the surface so closely that the electrons for an experiment are able to have a continuous flow of electrons, making a current from surface to the probe. The microscope was not initially well received due to the complex nature of the underlying theoretical explanations. In 1984 Jerry Tersoff and D.R. Hamann while at AT&T's Bell Laboratories in Murray Hill, New Jersey began publishing articles that tied the theoretical with the experimental results obtained by the instrument. This was closely followed in 1985 with functioning commercial instruments, and in 1986 with Gerd Binnig, Quate, and Gerber's invention of the atomic force microscope, then Binnig's and Rohrer's Nobel Prize in Physics for the SPM.[19] Scanning probe microscope types have continued to be developed as the ability to machine ultra fine probes and tips has advanced. Fluorescence microscopes See also: fluorescence microscope, immunofluorescence, and confocal microscope Fluorescence microscope with the filter cube turret above the objective lenses, coupled with a camera. The most recent developments in light microscope largely centre on the rise of fluorescence microscopy in biology.[citation needed] During the last decades of the 20th century, particularly in the post-genomic era, many techniques for fluorescent staining of cellular structures were developed.[citation needed] The main groups of techniques involve targeted chemical staining of particular cell structures, for example, the chemical compound DAPI to label DNA, use of antibodies conjugated to fluorescent reporters, see immunofluorescence, and fluorescent proteins, such as green fluorescent protein. These techniques use these different fluorophores for analysis of cell structure at a molecular level in both live and fixed samples. The rise of fluorescence microscopy drove the development of a major modern microscope design, the confocal microscope. The principle was patented in 1957 by Marvin Minsky, although laser technology limited practical application of the technique. It was not until 1978 when Thomas and Christoph Cremer developed the first practical confocal laser scanning microscope and the technique rapidly gained popularity through the 1980s. Super resolution microscopes Main articles: Super-resolution microscopy and Microscopy § Sub-diffraction techniques Much current research (in the early 21st century) on optical microscope techniques is focused on development of superresolution analysis of fluorescently labelled samples. Structured illumination can improve resolution by around two to four times and techniques like stimulated Emission Depletion microscopy are approaching the resolution of electron microscopes. This occurs because the diffraction limit is occurred from light or excitation, which makes the resolution must be doubled to become super saturated. X-ray microscopes Main article: X-ray microscope X-ray microscopes are instruments that use electromagnetic radiation usually in the soft X-ray band to image objects. Technological advances in x-ray lens optics in the early 1970s made the instrument a viable imaging choice.[20] They are often used in tomography (see micro-computed tomography) to produce three dimensional images of objects, including biological materials that have not been chemically fixed. Currently research is being done to improve optics for hard x-rays which have greater penetrating power.[20]

Types Types of microscopes illustrated by the principles of their beam paths Evolution of spatial resolution achieved with optical, transmission (TEM) and aberration-corrected electron microscopes (ACTEM).[21] Microscopes can be separated into several different classes. One grouping is based on what interacts with the sample to generate the image, i.e., light or photons (optical microscopes), electrons (electron microscopes) or a probe (scanning probe microscopes). Alternatively, microscopes can be classed on whether they analyze the sample via a scanning point (confocal optical microscopes, scanning electron microscopes and scanning probe microscopes) or analyze the sample all at once (wide field optical microscope and transmission electron microscopes). Wide field optical microscopes and transmission electron microscopes both use the theory of lenses (optics for light microscopes and electromagnet lenses for electron microscopes) in order to magnify the image generated by the passage of a wave transmitted through the sample, or reflected by the sample. The waves used are electromagnetic (in optical microscopes) or electron beams (in electron microscopes). Resolution in these microscopes is limited by the wavelength of the radiation used to image the sample, where shorter wavelengths allow for a higher resolution. Scanning optical and electron microscopes, like the confocal microscope and scanning electron microscope, use lenses to focus a spot of light or electrons onto the sample then analyze the signals generated by the beam interacting with the sample. The point is then scanned over the sample to analyze a rectangular region. Magnification of the image is achieved by displaying the data from scanning a physically small sample area on a relatively large screen. These microscopes have the same resolution limit as wide field optical, probe, and electron microscopes. Scanning probe microscopes also analyze a single point in the sample and then scan the probe over a rectangular sample region to build up an image. As these microscopes do not use electromagnetic or electron radiation for imaging they are not subject to the same resolution limit as the optical and electron microscopes described above. Optical Main article: Optical microscope The most common type of microscope (and the first invented) is the optical microscope. This is an optical instrument containing one or more lenses producing an enlarged image of a sample placed in the focal plane. Optical microscopes have refractive glass and occasionally of plastic or quartz, to focus light into the eye or another light detector. Mirror-based optical microscopes operate in the same manner. Typical magnification of a light microscope, assuming visible range light, is up to 1250x with a theoretical resolution limit of around 0.250 micrometres or 250 nanometres. This limits the practical magnification limit to ~1500x. Specialized techniques (e.g., scanning confocal microscopy, Vertico SMI) may exceed this magnification but the resolution is diffraction limited. The use of shorter wavelengths of light, such as the ultraviolet, is one way to improve the spatial resolution of the optical microscope, as are devices such as the near-field scanning optical microscope. Sarfus, a recent optical technique increases the sensitivity of standard optical microscope to a point it becomes possible to directly visualize nanometric films (down to 0.3 nanometre) and isolated nano-objects (down to 2 nm-diameter). The technique is based on the use of non-reflecting substrates for cross-polarized reflected light microscopy. Ultraviolet light enables the resolution of microscopic features, as well as to image samples that are transparent to the eye. Near infrared light can be used to visualize circuitry embedded in bonded silicon devices, since silicon is transparent in this region of wavelengths. In fluorescence microscopy, many wavelengths of light, ranging from the ultraviolet to the visible can be used to cause samples to fluoresce to allow viewing by eye or with the use of specifically sensitive cameras. Phase contrast microscopy is an optical microscopy illumination technique in which small phase shifts in the light passing through a transparent specimen are converted into amplitude or contrast changes in the image. The use of phase contrast does not require staining to view the slide. This microscope technique made it possible to study the cell cycle in live cells. The traditional optical microscope has more recently evolved into the digital microscope. In addition to, or instead of, directly viewing the object through the eyepieces, a type of sensor similar to those used in a digital camera is used to obtain an image, which is then displayed on a computer monitor. These sensors may use CMOS or charge-coupled device (CCD) technology, depending on the application. Digital microscopy with very low light levels to avoid damage to vulnerable biological samples is available using sensitive photon-counting digital cameras. It has been demonstrated that a light source providing pairs of entangled photons may minimize the risk of damage to the most light-sensitive samples. In this application of ghost imaging to photon-sparse microscopy, the sample is illuminated with infrared photons, each of which is spatially correlated with an entangled partner in the visible band for efficient imaging by a photon-counting camera.[22] Electron This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2017) (Learn how and when to remove this template message) Main article: Electron microscope Modern transmission electron microscope The two major types of electron microscopes are transmission electron microscopes (TEMs) and scanning electron microscopes (SEMs). They both have series of electromagnetic and electrostatic lenses to focus a high energy beam of electrons on a sample. In a TEM the electrons pass through the sample, analogous to basic optical microscopy. This requires careful sample preparation, since electrons are scattered strongly by most materials. The SEM has raster coils to scan the surface of bulk objects with a fine electron beam. Scanning probe Main article: Scanning probe microscopy First atomic force microscope The different types of scanning probe microscopes arise from the many different types of interactions that occur when a small probe of some type is scanned over and interacts with a specimen. These interactions or modes can be recorded or mapped as function of location on the surface to form a characterization map. The three most common types of scanning probe microscopes are atomic force microscopes (AFM), near-field scanning optical microscopes (MSOM or SNOM, scanning near-field optical microscopy), and scanning tunneling microscopes (STM).[23] An atomic force microscope has a fine probe, usually of silicon or silicon nitride, attached to a cantilever; the probe is scanned over the surface of the sample, and the forces that cause an interaction between the probe and the surface of the sample are measured and mapped. A near-field scanning optical microscope is similar to an AFM but its probe consists of a light source in an optical fiber covered with a tip that has usually an aperture for the light to pass through. The microscope can capture either transmitted or reflected light to measure very localized optical properties of the surface, commonly of a biological specimen. Scanning tunneling microscopes have a metal tip with a single apical atom; the tip is attached to a tube through which a current flows.[24] The tip is scanned over the surface of a conductive sample until a tunneling current flows; the current is kept constant by computer movement of the tip and an image is formed by the recorded movements of the tip.[23] Other types Scanning acoustic microscopes use sound waves to measure variations in acoustic impedance. Similar to Sonar in principle, they are used for such jobs as detecting defects in the subsurfaces of materials including those found in integrated circuits. On February 4, 2013, Australian engineers built a "quantum microscope" which provides unparalleled precision.[25]

See also Fluorescence interference contrast microscopy Laser capture microdissection Microscope image processing Microscope slide Multifocal plane microscopy Royal Microscopical Society

References ^ Characterization and Analysis of Polymers. Hoboken, N.J.: Wiley-Interscience. 2008. ISBN 978-0-470-23300-9.  ^ Bardell, David (May 2004). "The Invention of the Microscope". Bios. 75 (2): 78–84. JSTOR 4608700.  ^ The history of the telescope by Henry C. King, Harold Spencer Jones Publisher Courier Dover Publications, 2003 Pgs 25-27 ISBN 0-486-43265-3, ISBN 978-0-486-43265-6 ^ Atti Della Fondazione Giorgio Ronchi E Contributi Dell'Istituto Nazionale Di Ottica, Volume 30, La Fondazione-1975, page 554 ^ a b Murphy, Douglas B.; Davidson, Michael W. (2011). Fundamentals of light microscopy and electronic imaging (2nd ed.). Oxford: Wiley-Blackwell. ISBN 978-0471692140.  ^ Sir Norman Lockyer. Nature Volume 14.  ^ Albert Van Helden; Sven Dupré; Rob van Gent (2010). The Origins of the Telescope. Amsterdam University Press. pp. 32–36, 43. ISBN 978-90-6984-615-6.  ^ "Who Invented the Microscope?". Retrieved 31 March 2017.  ^ Eric Jorink. Reading the Book of Nature in the Dutch Golden Age, 1575-1715.  ^ William Rosenthal, Spectacles and Other Vision Aids: A History and Guide to Collecting, Norman Publishing, 1996, page 391 - 392 ^ Raymond J. Seeger, Men of Physics: Galileo Galilei, His Life and His Works, Elsevier - 2016, page 24 ^ J. William Rosenthal, Spectacles and Other Vision Aids: A History and Guide to Collecting, Norman Publishing, 1996, page 391 ^, Galileo Galilei (Excerpt from the Encyclopedia Britannica) ^ Gould, Stephen Jay (2000). "Chapter 2: The Sharp-Eyed Lynx, Outfoxed by Nature". The Lying Stones of Marrakech: Penultimate Reflections in Natural History. New York, N.Y: Harmony. ISBN 0-224-05044-3.  ^ a b Wootton, David (2006). Bad medicine: doctors doing harm since Hippocrates. Oxford [Oxfordshire]: Oxford University Press. p. 110. ISBN 0-19-280355-7. [page needed] ^ Liz Logan (27 April 2016). "Early Microscopes Revealed a New World of Tiny Living Things". Retrieved 3 June 2016.  ^ Knoll, Max (1935). "Aufladepotentiel und Sekundäremission elektronenbestrahlter Körper". Zeitschrift für technische Physik. 16: 467–475.  ^ Goldsmith, Cynthia S.; Miller, Sara E. (2009-10-01). "Modern Uses of Electron Microscopy for Detection of Viruses". Clinical Microbiology Reviews. 22 (4): 552–563. doi:10.1128/cmr.00027-09. ISSN 0893-8512. PMID 19822888.  ^ Morita, Seizo (2007). Roadmap of Scanning Probe Microscopy. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg. ISBN 978-3540343158.  ^ a b Erko, A. (2008). Modern developments in X-ray and neutron optics. Berlin: Springer. ISBN 978-3-540-74561-7.  ^ Pennycook, S.J.; Varela, M.; Hetherington, C.J.D.; Kirkland, A.I. (2011). "Materials Advances through Aberration-Corrected Electron Microscopy" (PDF). MRS Bulletin. 31: 36. doi:10.1557/mrs2006.4.  ^ Aspden, Reuben S.; Gemmell, Nathan R.; Morris, Peter A.; Tasca, Daniel S.; Mertens, Lena; Tanner, Michael G.; Kirkwood, Robert A.; Ruggeri, Alessandro; Tosi, Alberto; Boyd, Robert W.; Buller, Gerald S.; Hadfield, Robert H.; Padgett, Miles J. (2015). "Photon-sparse microscopy: visible light imaging using infrared illumination". Optica. 2 (12): 1049. doi:10.1364/OPTICA.2.001049. ISSN 2334-2536.  ^ a b Bhushan, Bharat, ed. (2010). Springer handbook of nanotechnology (3rd rev. & extended ed.). Berlin: Springer. p. 620. ISBN 978-3-642-02525-9.  ^ Sakurai, T.; Watanabe, Y., eds. (2000). Advances in scanning probe microscopy. Berlin: Springer. ISBN 978-3-642-56949-4.  ^ "Quantum Microscope for Living Biology". Science Daily. 4 February 2013. Retrieved 5 February 2013. 

External links Wikimedia Commons has media related to Microscopes. Microscopy laboratory in: A Study Guide to the Science of Botany at Wikibooks Milestones in Light Microscopy, Nature Publishing FAQ on Optical Microscopes Nikon MicroscopyU, tutorials from Nikon Molecular Expressions : Exploring the World of Optics and Microscopy, Florida State University. Microscopes made from bamboo at Audio microscope glossary Billings Microscope Collection Catalogue, National Museum of Health and Medicine. Study and Read at the Royal Microscopical Society v t e Optical microscopy Microscope Optical microscopy Illumination and contrast methods Bright-field microscopy Köhler illumination Dark-field microscopy Phase contrast Quantitative phase-contrast microscopy Differential interference contrast (DIC) Dispersion staining Second harmonic imaging (SHIM) 4Pi microscope Structured illumination Sarfus Fluorescence methods Fluorescence microscopy Confocal microscopy Two-photon excitation microscopy Multiphoton microscopy Image deconvolution Total internal reflection fluorescence microscopy (TIRF) Lightsheet microscopy (LSFM/SPIM) Sub-diffraction limit techniques Diffraction limit Stimulated emission depletion (STED) Photo-activated localization microscopy (PALM/STORM) Near-field (NSOM/SNOM) v t e Laboratory equipment General Heaters Dryers Alcohol burner Bunsen burner Desiccator Heating mantle Hot plate Lab oven Kiln Meker-Fisher burner Striker Teclu burner Water bath Vacuum dry box Mixers Shakers Chemostat Homogenizer Liquid whistle Magnetic stirrer Mortar and pestle Shaker Sonicator Static mixer Stirring rod Vortex mixer Wash bottle Stands Clamps Holders Beaker clamp Clamp holder Tripod Burette clamp Extension clamp Flask clamp Funnel support Iron ring Pinch clamp Retort stand Screw clamp Test tube holder Test tube rack Wire gauze Lab drying rack Containers Storage Agar plate Cryogenic storage dewar Incubator Laminar flow cabinet Microtiter plate Petri dish Picotiter plate Refrigerator Weighing boat Weighing dish Other items Aspirator Autoclave Balance brush Cork borer Crucible Filter paper File Forceps Centrifuge Microscope Pipeclay triangle Spectrophotometer Splint Stopper Scoopula Spatula Test tube brush Wire brush Inoculation needle Inoculation loop Glassware Apparatus Dean-Stark Soxhlet extractor Kipp's Bottles Boston round Pycnometer Condensers Cold finger Liebig Dishes Evaporating Petri Watch glass Flasks Büchner Vacuum (Dewar) Erlenmeyer Fernbach Fleaker Florence Retort Round-bottom Schlenk Volumetric Funnels Büchner Hirsch Dropping Separatory Measuring devices Burette Conical measure Cuvette Eudiometer Graduated cylinder Ostwald viscometer Pipette Pipette (dropper) Tubes Boiling Cragie Ignition Nuclear magnetic resonance (NMR) Test Thiele Thistle Other items Beaker Gas syringe Vial Analytical chemistry Compositional AutoAnalyzer CHN analyzer Colorimeter Inductively coupled plasma (ICP) device Gas chromatograph (GC) Liquid Chromatograph (LC) Mass spectrometer (MS) pH indicator pH meter Microscopy Scanning electron microscope (SEM) Transmission electron microscope (TEM) Thermochemistry Calorimeter differential scanning Melting point apparatus Thermometer Thermogravimetric analyzer (TGA) Other items Analytical balance Colony counter Spiral plater Nuclear magnetic resonance (NMR) instrument Plate reader Electronics Ammeter Current source Function generator Galvanostat Multimeter Network analyzer Oscilloscope Pulse generator Potentiostat Spectrum analyzer Time-domain reflectometer Voltage source Voltmeter Safety Personal protective equipment (PPE) Lab coat Face shield Respirator Rubber apron Safety shower Eye and hand Acid-resistant gloves Eyewash station Glove box Medical gloves Nitrile gloves Safety glasses Safety goggles Other items Acid (solvent) cabinet Biosafety cabinet Fire blanket Fire extinguisher Fume hood Instruments used in medical laboratories Authority control GND: 4039237-5 NDL: 00565496 Retrieved from "" Categories: Microbiology equipmentMicroscopesMicroscopyScientific instrumentsScience and technology in the Dutch RepublicDutch inventions17th-century introductionsHidden categories: Wikipedia articles needing page number citations from November 2013Wikipedia indefinitely semi-protected pagesWikipedia indefinitely move-protected pagesArticles lacking reliable references from April 2017All articles lacking reliable referencesUse Canadian English from September 2016All Wikipedia articles written in Canadian EnglishArticles containing Ancient Greek-language textAll articles with unsourced statementsArticles with unsourced statements from April 2017Articles needing additional references from April 2017All articles needing additional referencesWikipedia articles with GND identifiers

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