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such a thing? Do Indians not feel the do research have same? An ideal person like Swami Vivekananda would say, “ I do not care for liberation (from this world), I would . rather go to a hundred thousand hells, ‘doing good to others(silently) like the spring’, this is ib tok essay submission, my religion. Thus, there is only one religion in the world ideally, and this the drug best way to describe it. I am proud to hear such a soothing thought from an Indian. In the past, during the independence period, India saw a spurt in essay online submission, the economic sector with. A Dream , Culture of India , Democracy 1317 Words | 3 Pages. My dream is to live in a big detached house surrounded by a big garden full of flowers and trees. I wouldn't like to live in an . apartment with blocks of flats and rude neighbour’s making noise in essays on articles, the middle of the night.

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Figure 1(b) shows living HeLa cells in a plastic tissue culture vessel imaged with phase contrast. A fixed culture of Indian Muntjac cells mounted in an aqueous medium are presented in differential interference contrast image in Figure 1(c). A fresh tissue section of mouse heart muscle bathed in aqueous saline solution is ib tok submission displayed in the Figure 1(d) panel, where contrast is generated using Hoffman modulation (or ZEISS VAREL) contrast, an oblique illumination technique. The brilliant bright-on-dark contrast observed with darkfield illumination is shown in Figure 1(e) using an Obelia hydroid specimen. Help Essay! Finally, rabbit skeletal muscle fibers (Figure 1(f)) are among the biological specimens that are birefringent and demonstrate contrast in ib tok submission polarized light.

One of the primary and favorite techniques used in a term all forms of optical microscopy for the past three centuries, brightfield illumination relies upon submission, changes in light absorption, refractive index, or color for generating contrast. As light passes through the specimen, regions that alter the direction, speed, and/or spectrum of the wavefronts generate optical disparities (contrast) when the rays are gathered and focused by the objective. Resolution in a brightfield system depends on reactionh on articles, both the objective and condenser numerical apertures, and an immersion medium is required on both sides of the specimen (for numerical aperture combinations exceeding a value of 2.3). Digital cameras provide the wide dynamic range and essay online submission, spatial resolution required to mexican drug war essays capture the information present in a brightfield image. In addition, background subtraction algorithms, using averaged frames taken with no specimen in the optical path, increases contrast dramatically. Simple brightfield imaging, with the microscope properly adjusted for Kohler illumination, provides a limited degree of information about the cell outline, nuclear position, and the location of larger vesicles in unstained specimens. Contrast in brightfield imaging depends on differences in light absorption, refractive index or color.

Optical disparities (contrast) are developed as light passes through the specimen altering the direction, speed or spectral characteristics of the submission imaging wavefront. The technique is reactionh on articles more useful with specimens stained with visible light absorbing dyes (such as eosin and hematoxylin; see Figure 1(a)). However, the general lack of contrast in brightfield mode when examining unstained specimens renders this technique relatively useless for ib tok online serious investigations of living cell structure. First described by the Dutchman Frits Zernike in 1934, phase contrast earned its discoverer the Nobel Prize for physics in a term 1953 while revolutionizing basic biomedical research on living cells. Ib Tok Online! The technique is ideal for thin unstained specimens (such as culture cells on glass), which are approximately 5 to mexican drug war essays 10 micrometers thick above the nucleus, but less than a micrometer thick at the periphery. Such specimens barely exhibit any light absorption in the visible portion of the spectrum and the human eye cannot detect them in brightfield and ib tok essay submission, darkfield illumination. Phase contrast (as illustrated in global warming arguments essay Figure 1(b)) employs an essay optical mechanism to translate minute variations in phase into global warming arguments, corresponding changes in amplitude, which can be visualized as differences in image contrast. The microscope must be equipped with a specialized condenser containing an annulus or a series of annuli matched to ib tok online submission a set of objectives containing phase rings (designed Ph ) in the rear focal plane (phase contrast objectives can also be used with fluorescence, but with a slight reduction in transmission). Phase contrast is an have abstracts excellent method to increase contrast when viewing or imaging living cells in culture, but typically results in halos surrounding the outlines of edge features. These halos are optical artifacts that often reduce the online submission visibility of boundary details.

The technique is not useful for thick specimens (such as plant and animal tissue sections) because shifts in global essay phase occur in regions removed from the focal plane that distort image detail. Furthermore, floating debris and other out-of-focus phase objects interfere with imaging adherent cells on coverslips. As presented in ib tok essay Figure 2, very small differences exist between the refractive indices of the cells and their surrounding aqueous solutions and within the cells between the cytoplasm (Figure 2(b)) and the cell nucleus (Figure 2(c)). No significant refractive index difference occurs in the coverslip and surrounding medium (Figure 2(a)). Phase contrast makes these tiny differences visible by the use of help essay, optical manipulation as, for example, it translates them into differences in intensity that can be visually observed and online, recorded. The optical effect employed in this case consists of a shift of phase relationships between light wavefronts traveling through different portions of the specimen. During their journey through cell nuclei, cytoplasm, or water, the light waves are shifted (retarded) by small degrees, since these media have slightly different refractive indices (the higher the mexican war essays refractive index of a medium, the smaller the ib tok online speed or velocity of light in the medium). As a result, a light wave that has passed through a cell nucleus lags behind the light waves that only mexican, had to pass through water (compare Figure 2(a) and Figure 2(c)). The amount of essay, lag is called a phase shift. Before their entry into the specimen, the waves are still in phase (wavefronts beneath the reactionh coverslip), but this is no longer the case when they have passed through the various materials having different refractive indices. The amount of the phase shift depends on essay, what media (refractive index) the waves have passed through on help scholarship, their paths, and how long the paths were through these media.

The human eye cannot see these phase shifts in the microscope image, it is only able to distinguish between different intensities and colors. Therefore, the phase contrast technique uses optical tricks to translate phase shifts into grey values. In phase contrast microscope configuration, the condenser aperture diaphragm is replaced by a phase stop (the size of ib tok essay, which depends upon scholarship essay, objective and condenser numerical aperture) that illuminates the specimen via the condenser optical components in essay online submission a hollow cone of light fashion, as illustrated in Figure 3(a). These wavefronts enter the objective and an image of the phase stop is created in the rear focal plane (the objective pupil). Positioned within the objective rear focal plane is global warming a phase ring or plate that not only attenuates the bright, direct light originating from the phase stop in the condenser, but also adds a constant phase shift to this light. If the specimen contains sub-structures that have mixed refractive indices, these entities guide the light from the essay submission direct waves into middle, new paths (red dotted line in essay online submission Figure 3(a)). Wavefronts diffracted by the specimen (in effect, those containing structural information) will not pass through the phase ring in the objective, meaning that they will not be attenuated or retarded.

All of the wavefronts are ultimately recombined to form the intermediate image by mexican the tube lens. The wavefronts that have all been retarded to varying degrees by details in the specimen are superimposed in ib tok essay the intermediate image over the shifted and attenuated wavefronts where they amplify or attenuate each other (depending on the phase), forming the final phase contrast image observed in the eyepieces. These interference processes in the intermediate image create bright and dark areas of the various structures having refractive index (and/or thickness) variations in warming essay the specimen. Optimum contrast is created by selecting the correct retardation and attenuation values, which is a function of the optical properties of the phase ring in the objective aperture. A major artifact of phase contrast imaging is the bright halos of light that appear on the borders surrounding the ib tok specimen. Halos occur in phase contrast microscopy because the circular phase-retarding (and neutral density) ring located in the objective phase plate also transmits a small degree of diffracted light from the on articles specimen (it is not restricted to passing surround waves alone).

The problem is compounded by the fact that the ib tok essay online width of the non-diffracted light (zeroth-order) surround wavefront projected onto the phase plate by the condenser annulus is smaller than the actual width of the phase plate ring. Thick specimens, often exhibiting highly overlapping structures, produce severe halo artifacts. Therefore, phase contrast is papers have abstracts a method that is only recommended for very thin specimens where several structures are not physically lying on top of each other. In a thick specimen, details may be blended into an image that, in the final analysis, is no longer legible. Phase contrast requires special objectives that are equipped with a phase ring near the pupil or rear aperture. They are easy to recognize by the green inscription that denotes the size of the corresponding condenser phase stop: Ph1 , Ph2 , or Ph3 . If you hold such an objective against the light and look into the pupil from the threaded end, you will be able to see the grey/transparent phase ring. The condenser requires one, two, or three phase stops, depending on the phase contrast objectives that are attached to the microscope nosepiece. The required ring diameter increases with the essay online numerical aperture (high apertures require the maximum diameter ( Ph3 ), for example 0.9 in middle school air or 1.3 with oil immersion). Essay Online! Three sizes are available and are sufficient for all objectives (Figure 3(b)). If you use phase contrast with only one ring size, an easily attachable and functionsof a term paper, removable plug-in stop for the condenser will suffice.

A turret disk with several mounts is essay more convenient, since it contains all three phase stops and enables very fast changeover during imaging. Additional openings are available for the aperture iris necessary in brightfield illumination and for the darkfield diaphragm. The phase stops must be centered after they have been installed in the condenser so that the image of the phase stop in global essay the objective pupil corresponds exactly with the position of the phase ring in the beam path (see Figure 4(c)). Centering is performed using two small wrenches (or screwdrivers, depending upon the microscope model) on the turret disk of the condenser. If you want to be particularly precise, use a centering telescope to observe the objective rear aperture for making these adjustments, as illustrated in Figure 4. This small accessory looks like an eyepiece and is inserted into the observation tube in place of an eyepiece. When the telescope is focused on the pupil (rear aperture) of the objective, the position of the phase stops can be clearly observed. Again, look into ib tok essay submission, the objective pupil and bring the bright image of the condenser phase stop into coincidence with the phase ring of the life objective. This is clearly shown in Figure 4. In Figures 4(a) and 4(b), the phase stop is not aligned with the objective phase plate, while the ib tok online submission stop and phase plate are in functionsof paper perfect congruence in Figure 4(c).

The image of a specimen in phase contrast can be influenced by appropriately selecting the retardation of the ib tok essay direct (non-diffracted) beam through careful selection of the phase ring in the objective. Depending on the retardation value selected, objects with a higher refractive index than their surroundings appear either brighter or darker than their surroundings. This is also called either positive or negative phase contrast. In modern microscopes, positive phase contrast is mexican standard, where the darkness of ib tok essay online, object features increases with their refractive index. The effect simulates absorption to the observer's eye in do research have areas where a higher refractive index produces high contrast features.

This impression is considered the optimum, particularly with cells and tissue in aqueous media because cell nuclei and organelles, for example, appear darker than the essay submission cytoplasm. For some applications, such as examining sperm cells, negative phase contrast may produce more specimen detail than the reactionh essays traditional positive phase contrast. back to ib tok submission top ^ Differential Interference Contrast. Differential interference contrast microscopy ( DIC ; Figure 1(c)) requires plane-polarized light and additional light-shearing (Nomarski) prisms to exaggerate minute differences in specimen thickness gradients and reactionh on articles, refractive index. Submission! Lipid bilayers, for a term paper example, produce excellent contrast in DIC because of the essay online submission difference in refractive index between aqueous and lipid phases of the cell.

In addition, cell boundaries in relatively flat adherent mammalian and papers abstracts, plant cells, including the plasma membrane, nucleus, vacuoles, mitochondria, and stress fibers, which usually generate significant gradients, are readily imaged with DIC. In plant tissues, the birefringent cell wall reduces contrast in DIC to a limited degree, but a properly aligned system should permit visualization of nuclear and vacuolar membranes, some mitochondria, chloroplasts, and ib tok submission, condensed chromosomes in epidermal cells. Differential interference contrast is an important technique for imaging thick plant and animal tissues because, in addition to the increased contrast, DIC exhibits decreased depth of field at wide apertures, creating a thin optical section of the functionsof a term paper thick specimen. This effect is also advantageous for imaging adherent cells to minimize blur arising from floating debris in ib tok essay online submission the culture medium. The differential interference contrast optical system is based on the polarized light contrast technique as far as many of the components utilized are concerned. DIC for warming arguments essay a modern transmitted light microscope is different than that in reflected light because two birefringent prisms are used (see Figure 6), and the specimen's optical path difference is determined by the product of the refractive index difference (between the specimen and its surrounding medium) and ib tok submission, the thickness (geometrical distance) traversed by a light beam between two points on the optical path (Figure 5). Images produced in differential interference contrast microscopy are characterized by global arguments a distinctive shadow-cast appearance, as if they were illuminated from online submission, a highly oblique light source originating from a single azimuth. Unfortunately, this effect, which often will render a specimen in warming arguments a pseudo three-dimensional relief (Figure 6(d)), is frequently assumed by uninformed microscopists to be an indicator of actual topographical structure. Figure 6 illustrates the differential interference contrast beam path that is similar to that of ib tok, polarized transmitted light.

In DIC (as compared to polarized light), the two birefringent prisms (Figure 6(b)) are inserted into the optical train, one in the condenser and the second near the objective pupil. Paper! The condenser prism performs a vectorial decomposition of the previously linearly polarized light (Figure 6(c)) into two vibration directions that are perpendicularly polarized to essay each other, and reactionh, laterally shifts these partial beams in such a way that a small lateral displacement of the wavefronts occurs where regions of thickness or refractive index vary. If the two partial beams now pass through exactly the same structures, no further path difference will occur in the specimen (Figure 5(a) and Figure 5(c)). However, if the two partial beams see slightly different conditions, each of them will experience a slightly difference pathlength that accompanies it on the remaining trip to the intermediate image plane (Figure 5(b)). As discussed, the split DIC light beams enter and pass through the ib tok online specimen where their wave paths are altered in drug accordance with the specimen's varying thickness, slopes, and refractive indices.

These variations cause alterations in essay the wave path of both beams passing through areas of global, any specimen details lying close together. When the online parallel beams enter the objective, they are focused above the reactionh rear focal plane where they enter a second DIC prism that combines the two beams at a defined distance outside of the prism itself. This removes the ib tok shear (distance between the waves) and functionsof, the original path difference between the beam pairs. As a result of having traversed the specimen, the paths of the parallel beams are not of the same length (optical path difference) for differing areas of the specimen. In order for ib tok essay online submission the beams to a college essay interfere, the vibrations of the beams of different path length must be brought into online submission, the same plane and axis. This is school life accomplished by placing a second polarizer (analyzer) above the upper DIC beam-combining prism. The light then proceeds toward the eyepiece where it can be observed as differences in intensity and color. The design results in one side of a specimen detail appearing bright (or possibly in color) while the other side appears darker (or another color). This shadow effect bestows the pseudo three-dimensional appearance to the specimen that was described above.

There are numerous advantages in DIC microscopy as compared to ib tok essay online submission phase contrast microscopy. With DIC, it is reactionh essays possible to make fuller use of the numerical aperture of the system and to provide optical staining (color). DIC also allows the microscope to achieve excellent resolution. Use of full objective aperture enables the microscopist to focus on a thin plane section of a thick specimen without confusing images from above or below the plane. Annoying halos, often encountered in submission phase contrast, are absent in global warming essay DIC images, and suitable achromat and fluorite objectives can be used for this work. It is ib tok essay submission important to keep in mind, however, since DIC is based on polarized light principles, highly birefringent specimens or those embedded in birefringent materials should not be observed under DIC. back to top ^ Hoffman Modulation and VAREL Contrast. Often metaphorically referred to as poor man's DIC, Hoffman modulation contrast ( HMC ) is an warming essay oblique illumination technique that enhances contrast in living cells and tissues by ib tok submission detection of optical phase gradients (see Figure 1(d)). Warming Essay! The basic microscope configuration includes an optical amplitude spatial filter, termed a modulator, which is inserted into the rear focal plane of the objective. Light intensity passing through the modulator varies above and below an average value, which by definition, is then said to be modulated. Coupled to the objective modulator is an off-axis slit aperture that is placed in submission the condenser front focal plane to direct oblique illumination towards the specimen.

Unlike the help essay phase plate in phase contrast microscopy, the Hoffman modulator is designed not to alter the phase of light passing through; rather it influences the essay online submission principal zeroth order maxima to produce contrast. Hoffman modulation contrast is not hampered by the use of birefringent materials (such as plastic Petri dishes) in reactionh essays the optical pathway, so the technique is more useful for examining specimens in containers constructed with polymeric materials. Ib Tok Online Submission! On the downside, HMC produces a number of optical artifacts that render the technique somewhat less useful than phase contrast or DIC for live-cell imaging on functionsof, glass coverslips. A newly developed contrasting technique, in which phase contrast is essay submission combined with inclined unilateral illumination (similar to HMC), has been developed for the examination of help writing a college scholarship, living cells in culture vessels. An additional stop shaped like a ring sector is used on the illumination side, permitting unilateral inclined illumination. Three illumination modes, unilateral darkfield, VAREL (variable relief) contrast, and inclined brightfield (similar to ib tok submission oblique illumination or HMC) are set by shifting the stop in the radial direction from the outside to the inside (see Figure 7) and a segment of mexican drug, a matching annulus is moved into position. This slit directs the source illumination to pass through a second ring of high absorption on the objective aperture's periphery, which suppresses its intensity by an amount dependent upon the density of the outer ring. The diffracted orders of light pass through the objective without being suppressed by ib tok essay online submission the VAREL ring. You can also manipulate the position of the slit if you want to vary the extent the source illumination is suppressed.

Orientation is easy to essays achieve and maintain because of the concentric nature of the slit. Furthermore, because of the VAREL ring's location in the objective, VAREL and phase contrast rings can be combined in the same objective. This makes for a very low-price method of imaging cells in culture vessels. Essay! The problems of mexican drug, imaging in both traditional and essay submission, routine tissue culture applications can be resolved with this method, it is a successful option for the examination of living objects (micromanipulation), and a range of structures with varying optical thickness are easily imaged with VAREL. Even culture vessels with a curved bottom allow a useful image to be produced. Phase contrast alone sometimes fails in reactionh such cases because a curved chamber base acts like a lens and impairs the superimposition of phase rings. A slider contains two of the mentioned sectors to allow illumination to be performed from the left or right, as required. This makes it possible to submission contrast cells even near the edges of the holes in microtiter plates. The methodology surrounding darkfield microscopy, although widely used for imaging transparent specimens throughout the 19th and middle, 20th Centuries, is limited in use to physically isolated cells and organisms (as presented in Figure 1(e)). Ib Tok Essay Online! In this technique, the condenser directs a cone of light onto the specimen at high azimuths so that first-order wavefronts do not directly enter the objective front lens element.

Light passing through the specimen is diffracted, reflected, and/or refracted by reactionh optical discontinuities (such as the cell membrane, nucleus, and internal organelles) enabling these faint rays to ib tok enter the objective. The specimen can then be visualized as a bright object on an otherwise black background. Mexican Drug War Essays! Unfortunately, light scattered by objects removed from the focal plane also contribute to ib tok submission the image, thus reducing contrast and obscuring specimen detail. This artifact is compounded by the fact that dust and debris in the imaging chamber also contribute significantly to the resulting image. Furthermore, thin adherent cells often suffer from drug war essays, very faint signal, whereas thick plant and animal tissues redirect too much light into the objective path, reducing the effectiveness of the technique. Recently, a renewed interest in transmitted darkfield microscopy has arisen due to essay online its advantages when used in combination with fluorescence microscopy. Darkfield microscopy is a specialized illumination technique that capitalizes on oblique illumination, as described above, to enhance contrast in global warming arguments essay specimens that are not imaged well under normal brightfield illumination conditions.

An artificial dark background is created in the microscope using an annular stop in the condenser (see Figure 8). Although the condenser optics then illuminate the sample, they do so with a hollow inverted cone of light that passes through the specimen at extremely oblique angles at all azimuths so that only the ib tok online submission light interacting with specimen features is able to scholarship essay enter the microscope objective to form a bright image of the specimen superimposed onto essay submission a dark background. To create the high angles, it is necessary for the objective aperture to help a college be smaller than the ib tok essay online submission inner aperture of the illuminating light cone (see Figure 8(a)). However, objectives with an integrated variable iris diaphragm are also available to shutter out the indirect light even if it falls into the aperture cone of the objective (as illustrated in Figure 8(b)). This permits the use of very high apertures for darkfield illumination. Darkfield microscopy is an excellent tool for biological and functionsof paper, medical investigations. It can be effectively used at ib tok online high magnifications to image living bacteria, or at low magnifications to view and image cells, tissues, and whole mounts. Polarized light microscopy is mexican war essays a contrast-enhancing technique that dramatically improves the quality of an image acquired with birefringent materials when compared to other techniques such as brightfield and ib tok submission, darkfield illumination, phase contrast, differential interference contrast, fluorescence, and Hoffman modulation contrast.

Polarized light microscopes possess a high degree of sensitivity and can be used for both qualitative and quantitative studies targeted at reactionh essays on articles a wide range of anisotropic specimens. Ib Tok Online Submission! Qualitative polarizing microscopy is a college scholarship quite popular in practice, however, the quantitative aspects of polarized light microscopy, which are principally applied in crystallography, represent a much more difficult subject that is primarily used by mineralogists, geologists, and chemists. The steady advances achieved over the past few years in highly sensitive polarized light microscopy have allowed biologists to examine the birefringent character of several anisotropic sub-cellular assemblies. Polarized light microscopy (Figure 1(f)) is conducted by viewing the specimen between crossed polarizing elements inserted into the optical train before the online condenser and after the middle life objective. Assemblies within the cell having birefringent properties, such as the plant cell wall, starch granules, and the mitotic spindle, as well as muscle tissue, rotate the plane of light polarization, appearing bright on a dark background. Ib Tok! The rabbit muscle tissue illustrated in Figure 1(f) is an example of reactionh essays, polarized light microscopy applied to living tissue observation. Note that this technique is limited by the occurrence of birefringence in living cells and tissues, and has yet to be fully explored. As mentioned above, differential interference contrast operates by placing a matched pair of opposing Nomarski prisms between crossed polarizers, so that any microscope equipped for DIC observation can also be employed to examine specimens in plane-polarized light simply by removing the prisms from the optical pathway. There are two polarizing elements in a polarizing microscope (see Figure 9).

The first polarizer is placed beneath the specimen stage with its vibration azimuth fixed in the East-West direction. Note most of these elements in commercial microscopes can be rotated through 360 degrees. Another polarized (the analyzer), which is usually aligned with a vibration direction oriented North-South (but again rotatable on some microscopes), is placed above the objective and can be moved into and out of the light path as needed. When both the online polarizer and analyzer are inserted into the optical path, their vibration azimuths are positioned at right angles to each other. In this configuration, the polarizer and analyzer are crossed, with no light passing through the optical system and a dark background present in the eyepieces (Figure 9(a)). Help Scholarship Essay! Linearly polarized light waves are generated by polarizers that filter out a privileged plane from the statistical confusion of vibrational directions prevailing in essay online natural light. The two orthogonal components of light (ordinary and extraordinary waves) travel at different speeds through the specimen and, as a result, observe different refractive indices, a phenomenon known as birefringence (derived from the terms double or bi refraction ). Functionsof A Term! A quantitative measurement of birefringence equals the numerical difference between the wavefront refractive indices.

The faster wavefront emerges first from the specimen to generate an optical path difference with the online slower wavefront. The analyzer recombines components of the two wavefronts traveling in the same direction and vibrating in the same plane. This polarizing element ensures that the two wavefronts have the same amplitude at the time of recombination for maximum contrast. The appropriate arrangement for papers have polarized light imaging is relatively easy to implement on virtually any microscope. Online Submission! The polarizer beneath the reactionh essays on articles condenser (near the aperture diaphragm) ensures that the specimen is illuminated with linearly polarized wavefronts that pass through the condenser (refer to Figure 9(a)). The analyzer (a second polarizer), which is oriented with the submission azimuth arranged at an angle of 90 degrees to that of the polarizer, is warming located behind the objective. Essay Submission! The tube lens forms the intermediate image, which is projected through the eyepieces or onto a camera imaging plane.

If no specimen is placed on the microscope stage, the scene observed through the eyepieces will remain completely dark. When illuminated, many specimens turn the vibration direction of the polarized light out of the plane produced by the polarizer. Such specimens consist mainly of birefringent materials, in which the essays refractive index depends on ib tok essay online submission, the vibration direction of the essay school incident light. Ib Tok Online Submission! This is mainly the case with crystals, such as starch or minerals (Figure 9(c)), but also occurs with fibers (Figure 9(d)) and polymers. If such materials are viewed under the polarization microscope between the crossed polarizer and papers have abstracts, the analyzer, bright areas can be seen in the image because light is partially transmitted by the analyzer. The polarized light microscope optical train can also include an auxiliary element known as a lambda or retardation plate (Figure 9(a) and 9(b)) that is used in quantitative analysis. In polarized light, this lambda plate converts contrast into colors. As in phase contrast, optical path differences give rise to colors, although this time with polarized light and birefringent material in the specimen. The path differences generated leads to an extinction of certain wavelengths in the light through interference (only certain colors remain from the white light and create beautiful, colored pictures). Ib Tok! Polarizing microscopy offers an immense amount of information about the composition and three-dimensional structure of a range of help a college essay, samples.

Practically unlimited in its scope, the technique can reveal information about thermal history and the strains to which a specimen was subjected during formation. Valuable in essay submission manufacturing and arguments, research, polarizing microscopy is relatively inexpensive and an accessible research and quality control tool that can provide information unavailable with any other technique. Rudi Rottenfusser - Zeiss Microscopy Consultant, 46 Landfall, Falmouth, Massachusetts, 02540. Erin E. Wilson and online submission, Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.