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1. Drosophila Aberrations
- flybase.net
2. Aberrations géométriques
- www.univ-lemans.fr
- Aberrations géométriques Rappels :.
- Les principales aberrations géométriques sont l'astigmatisme (image non ponctuelle d'un point) et l'aberration de sphéricité des faisceaux pour un point situé hors de l'axe (coma).
- Les aberrations d'inclinaison correspondent à la déformation d'un objet plan (distorsion et courbure de champ) et ne sont pas envisagées ici.
- Pour la mise en évidence des aberrations géométriques, il faut travailler en lumière monochromatique pour éliminer les aberrations chromatiques.
- Correction des aberrations.
- Le calcul ou l'expérience (types de lentilles) montrent qu'il faut, pour minimiser les aberrations géométriques, orienter une lentille convergente avec sa face la plus bombée dirigée vers le point source ou image le plus éloigné de la lentille.
- En utilisant des verres de natures différentes, ces associations permettent également de corriger les aberrations chromatiques.
3. Chromatic Aberrations: Optical: Glossary: Learn: Digital Photography Review
- www.dpreview.com
- Learn : Glossary : Optical : Chromatic Aberrations.
- Chromatic Aberrations.
- Chromatic aberrations occur more in consumer and prosumer digital compact cameras, but SLRs can suffer from it too. ...
- Chromatic Aberrations in a Single Lens.
- From an optical point of view, chromatic aberrations are caused by the camera lens not focusing different wavelengths of light onto the exact same focal plane (the focal length for different wavelengths is different) and/or by the lens magnifying different wavelenghts differently. ...
- In digital cameras, microlenses can also be a source of chromatic aberration and the visibility of chromatic aberrations is sometimes amplified by blooming.
- However, not even these lens systems are completely perfect and still can lead to visible chromatic aberrations, especially at wide angles.
- Learn : Glossary : Optical : Chromatic Aberrations.
4. Lens Aberration Concepts
- hyperphysics.phy-astr.gsu.edu
- Aberrations.
- The influences which cause different rays to converge to different points are called aberrations. ...
- Summary of aberrations and corrections.
- Summary of Aberrations .
- The influences which cause different rays to converge to different points are called aberrations. ...
5. Olympus Microscopy Resource Center: Anatomy of the Microscope - Optical Aberrations
- www.olympusmicro.com
- Optical Aberrations.
- Microscope objectives offered by the leading manufacturers have remarkably low degrees of aberrations and other imperfections, provided the appropriate objective is selected for the task and the objective is utilized properly in accordance with the manufacturer's recommendations. ...
- Objectives are made with differing degrees of optical correction for both monochromatic (spherical, astigmatism, coma, distortion) and polychromatic aberrations, field size and flatness, transmission wavelengths, freedom from fluorescence, birefringence and other factors contributing to background noise. ... This section addresses some of the more common optical aberrations that are commonly found (and often corrected) in microscope objectives.
- Overview of Optical Aberrations - Departures in lens action from the idealized conditions of Gaussian optics are known as optical aberrations. Microscope optical trains typically suffered from as many as five common aberrations: spherical, chromatic, curvature of field, comatic, and astigmatic. ...
- Astigmatism - Astigmatism aberrations are similar to comatic aberrations, however these artifacts are not as sensitive to aperture size and depend more strongly on the oblique angle of the light beam. ...
- Chromatic Aberration - Chromatic aberrations are wavelength-dependent artifacts that occur because the refractive index of every optical glass formulation varies with wavelength. ...
- Comatic Aberration - Comatic aberrations are similar to spherical aberrations, but they are mainly encountered with off-axis light fluxes and are most severe when the microscope is out of alignment. When these aberrations occur, the image of a point is focused at sequentially differing heights producing a series of asymmetrical spot shapes of increasing size that result in a comet-like (hence, the term coma) shape to the Airy pattern.
- The two most prevalent types of distortion, positive and negative (often termed pincushion and barrel, respectively), can often be present in very sharp images that are otherwise corrected for spherical, chromatic, comatic, and astigmatic aberrations. ...
- Selected Literature References - Aberrations are divided into two main categories: errors that occur when polychromatic light (white light) is passed through a lens, and errors that are present when only a single wavelength (monochromatic) of light is utilized. The selected references listed in this section contain information about the cause and correction of the most common optical aberrations encountered with microscope and other lens systems. Bear in mind that the optical designer must correct for both polychromatic and monochromatic aberrations simultaneously in the production of well-corrected microscope objectives.
6. 2122: Tuberous sclerosis type 2: RNA based detection of complex splicing aberrations in the TSC2 gene by the protein truncation test (PTT).
- www.faseb.org
- Tuberous sclerosis type 2: RNA based detection of complex splicing aberrations in the TSC2 gene by the protein truncation test (PTT). ...
- Mutation analyses in tuberous sclerosis (TSC) have reported a wide variety of disease causing aberrations in the two known predisposing genes, TSC1 and TSC2 on chromosomes 9q34 and 16p13, comprising mainly small truncating mutations distributed over the entire genes. ...
7. ABERRATIONS - THE PARANORMAL MINUTE!
- www.aberrations.net
- WELCOME TO ABERRATIONS - "THE PARANORMAL MINUTE" - RADIO FREE PARANORMAL!.
- Welcome to Aberrations - "The Paranormal Minute". ...
8. Les aberrations chromosomiques
- www.med.univ-rennes1.fr
- Les Aberrations chromosomiques.
- 2 Mécanisme des aberrations chromosomiques.
- 3 Autres principales aberrations chromosomiques.
- Par cette découverte s'ouvrait un nouveau chapitre de pathologie, celui des aberrations chromosomiques dont la trisomie 21 reste le type le plus fréquent.
- - les dermatoglyphes sont très particuliers : dans un grand nombre de cas les les deux plis de la paume sont remplacés par un pli palmaire unique transverse (mais ce caractère n'est pas constant ; il se retrouve dans d'autres aberrations chromosomiques et aussi chez 1 % des sujets normaux).
- 2 Mécanisme des aberrations chromosomiques.
- Les aberrations chromosomiques résultent donc d'accidents mécaniques subis par le chromosome lors de la division cellulaire.
- 3 Autres principales aberrations chromosomiques.
- (1 cas sur 5000 naissances, c'est-à-dire qu'elle constitue la moins rares des aberrations chromosomiques après la trisomie 21).
- L'association à une trisomie 21 : n'est pas exceptionnelle, réalisant alors le caryotype 48,XXY,+21, c'est-à-dire une double trisome ; dans ce tableau seuls se verront les signes cliniques de la trisomie 21 ; c'est seulement l'étude du caryotype qui fera la preuve des deux aberrations chromosomiques concomitantes. ...
9. Aberrations in Black
- www.upress.umn.edu
- Aberrations in Black.
- Aberrations in Black tells the story of canonical sociology’s regulation of sexual difference as part of its general regulation of African American culture. ...
10. Sky-Watcher Telescope. Correcting Optical aberrations
- www.skywatchertelescope.com
- This results in a higher focal ratio and the aberrations become less pronounced. ...
11. Cyber-Psychos AOD: The Magazine of Mental Aberrations
- cyberpsychos.netonecom.net
12. Correcting Coma/Field-Curvature Type Aberrations With Deconvolution
- www.princeton.edu
- Correcting Coma/Field-Curvature Type Aberrations With Deconvolution.
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