eye

Optical spectrum

...gnetic spectrum that is visible to the human eye . There are no exact bounds to the optical spectrum; a typical human eye will respond to wavelengths from 400 to 700 nm , although some people may be able to perceive wavel...

Vestibular system

...uron-arc (Fig 3). Using these direct connections, eye movements lag the head movements byless than 10 ms...operly any more. As a consequence, no compensatory eye movements are generated, and the patient cannot fixate a point in space during this rapid head movem...

Thomas Hunt Morgan

...ogeny were all red-eyed, suggesting that the white eye trait was recessive. Morgan thus named the gene white , starting the tradition of naming genes after their mutant allele . As Morgan continued to cross-breed the mutants back to one another, he noticed that only males displayed the white-eyed trai...

Signal transduction

... in the plasma membrane of a retina cell in the eye that was activated by a photon can activate up to 2000 effector molecules (in this case, transducin ) per second. The total strength of signal amplification by a receptor is determined by: The lifetime of the hormone-receptor-complex. The ...

Rudolf Steiner

... is a perceptive instrument for ideas, just as the eye is a perceptive instrument for light. He characterized his system of Anthroposophy as follows: "Anthroposophy is a path of knowledge, to guide the spiritual in the human being to the spiritual in the universe... Anthroposophists are those who e...

Protozoa

...protozoans are too small to be seen with the naked eye - most are around 0.01-0.05 mm , although forms up to 0.5 mm are still fairly common - but can easily be found under a microscope. Protozoa are ubiquitous throughout aqueous environments and the soil, and play an important role in their ecology. A...

Phenotype

...specific manifestation of a trait, such as size or eye color, that varies between individuals. Phenotype ... chemistry or sequencing to determine a person's eye color), classical genetics uses phenotypes to deduce the functions of genes. Breeding experiments ...

Olfaction

...lengths of light are encoded by cones of the eye . Currently, only vibration theory can explain why a molecule containing hydrogen atoms (such as decaborane , B 10 H 14 ) and one containing deuterium atoms (such as deuterated decaborane, B 10 D 14 ) smell differently. Both have the same shap...

Muscle

...ith each contraction. The external muscles of the eye are conspicuously large and strong in relation to ...joules) Alaska optometric association (External eye muscles "100 times as strong as they need to be") course notes for a Virginia Commonwealth dance c...

Microscope

... are too small to be seen by the naked or unaided eye . The science of investigating small objects usi... day, but suffers from a small field size, and the eye relief is uncomfortably close compared to modern widefield oculars. Anton van Leeuwenhoek (1632-1...

Homunculus

... place an entire person, or homunculus, behind the eye who gazes at the retinas. A more sophisticated argument might propose that the images on the retinas are transferred to the visual cortex where it is scanned. Again this cannot be a full explanation because all that has been done is to place a littl...

Gene therapy

... in preparation, mainly trying to treat muscle and eye diseases, the two tissues where the virus seems particularly useful. Problems and ethics For the safety of gene therapy, the Weismann barrier is fundamental in the current thinking. Soma-to-germline feedback should therefore be impossible. ...

Gene

...ay give rise to differences in traits, for example eye color. A gene's most common allele is called the wild type allele, and rare alleles are called mutants . Normally, RNA is an intermediate product in the translation of a molecular gene into a protein. However, for some gene sequences, RNA mole...

Eye

... eyes have the same anatomy as a human eye. An eye is an organ that detects light . Different ki... showTocToggle("show","hide") 1 Varieties of eye 2 Focusing 3 Convergence 4 Ocular Anatomy 5 Eye Related Problems 6 See also ...

Warm-blooded

...brains and eyes in cold water, allowing for faster eye movements when hunting. Tuna are able to warm their entire bodies through a heat exchange mechanism called the rete mirable, which helps keep heat inside the body, and prevents the loss of heat through the fish's gills into the cold water. Bees . ...

Diabetes mellitus

...athy , poor wound healing or a foot ulcer, certain eye problems, certain fungal infections , or delivering a baby with macrosomia or hypoglycemia . Criteria for diagnosis Diabetes mellitus is characterized by recurrent or persistent hyperglycemia, and is diagnosed by demonstrating any one of tw...

Cilium

...gment of the rod photoreceptor cell in the human eye is connected to its cell body with a specialized non-motile cilium. The terminal fiber of the olfactory neuron is also a non-motile cilium, where the odorant receptors locate. Almost all types of the mammalian cells have a single non-motile cilium ...

Chromosome

...often have a short stature, low hairline, abnormal eye features and bone development and a "caved-in" appearance to the chest. XYY syndrome Triple-X syndrome You can find a detailed graphical display of all human chromosomes and the diseases annotated at the correct spot at [2] . See also ...

Brain

... consists of a large opitical lobes behind each eye for visual processing and a central brain with th...brum. The optical lobes are positioned behind each eye and process visual stimuli (Butler, 2000). The protocerebrum contains the mushroom bodies , which ...

Biophysics

...xperimental results are observable with an unaided eye or, at most, optical magnification . Using these techniques, biologists attempt to elucidate the complex systems of interactions that give rise to the processes that make life possible. Biophysics typically addresses biological questions simil...

Anton van Leeuwenhoek

...al Society . " No more pleasant sight has met my eye than this of so many thousands of living creatures in one small drop of water... " - Stated after his discovery of the microscopic world over three centuries ago. He is thought by some to have been the model for Vermeer 's painting The Geographe...

Albinism

...ure to the sun as a result. Lack of melanin in the eye often results in problems with vision, as the eye will not develop properly without the pigment. Individuals with full albinism (called albinos) gene...