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Spherical in Medical News

Physicists at CCNY determine density limit for randomly packed spherical materials

NEW YORK, June 2, 2008 The problem of how many identical-sized spheres can be randomly packed into a container has challenged mathematicians for centuries. A team of physicists at The City College of New York (CCNY) has come up with a solution that could have implications for everything from pro...

Tea tree oil and silver together make more effective antiseptics

...ons and abscesses), and the yeast Candida albicans, which causes thrush, were killed. These positive findings led the researchers to use microscopic spherical bodies called liposomes, made of phospholipids, the naturally occurring lipids or fats in the cell wallsmembranes, to deliver the silver and tea tree ...

Hollow gold nanospheres show promise for biomedical and other applications

..., March 22, at the annual meeting of the American Chemical Society in Salt Lake City. "What makes this structure special is the combination of the spherical shape, the small size, and the strong absorption in visible and near infrared light," Zhang said. "The absorption is not only strong, it is also narro...

SynergEyes(R) Launches a New Website for Keratoconus Patients

...d contact lenses. Keratoconus is a highly debilitating eye condition in which the cornea thins and becomes cone-shaped and irregular rather than spherical like a normal cornea. SharingOneVision.com provides patients with a website where they can learn about keratoconus, read detailed information on the S...

Targeted nanospheres find, penetrate, then fuel burning of melanoma

...ates them near the cell's vasculature. The researchers packaged hollow, spherical gold nanospheres with a peptide - a small compound composed of amino acids ...r size - small even for nanoparticles at 40-50 nanometers in diameter - and spherical shape allow for greater uptake and cellular penetration. They have strong, ...

Tiny capsules deliver

...elivery systems are complicated and challenging to implement. The Penn State researchers' approach produces a more universal delivery system, a tiny spherical container averaging less than 5 microns or the diameter of the smallest pollen grains. The spheres are formed around solid microparticles that are e...
Spherical in Medical Products

Arndt Endobronchial Blocker - Spherical Balloon

Description: Used for endobronchial blockade of the left or right lung for procedures which require one-lung ventilation. The set consists of an endobronchial blocker catheter and an Arndt Multiport Airway Adapter. Supplied sterile in peel-open packages. Intended for one-time use....
Company:Cook Critical Care

KR-9000PW Wavefront Analyzer

Description:...ver objective data that is unmatched in accuracy and reliability. The instrument provides sphere, cylinder and axis measurements as well as indicating spherical aberrations, coma and other high order aberrations of the eye. With a measuring range of -25 to +22 diopters of sphere, the new KR-9000PW is a practic...
Company:Topcon America Corporation

Miguel Maldonado LASIK Posterior Ablation Platform

Description:... A Combination Fixation Ring With A Platform Provides A Physiologically spherical And Low-Reflective Smooth Surface To Place A Reflected Flap For Undersurface Laser Ablation Of The Posterior Flap....
Company:Rhein Medical, Inc.

ACRYSOF IQ IOL

Description:... Give patients the best potential for quality vision with ACRYSOF IQ IOL. The ACRYSOF IQ IOL compensates for spherical aberration by addressing the effects of over-refraction at the periphery. This is accomplished without increasing edge thickness. Human corneal chara...
Company:Alcon Laboratories

CFI Achromat Series for Brightfield/Phase Contrast (DL)

Description:... chromatic aberration has been dramatically improved with performance similar to the CFI Plan Achromat Series. These objectives are also corrected for spherical aberration and provide image flatness across the entire 22mm field of view. The DL phase contrast objectives in this series have more contrast than th...
Company:Nikon

TMS-4 Corneal Topographer

Description:...ultiple and you can even customize your own map with favorite scale, map type and so on. Fourier Analysis provides you the refractive information with spherical equivalent, Regular Astigmatism, Asymetry & Higher order irregularity. Fourier Analysis provides the refractive information with 3mm & 6mm diameter ra...
Company:Tomey Corp.
Spherical in Medical Dictionary

Staphylococcus aureus

... Staphylococcus aureus is the most common cause of staph infections. It is a spherical bacterium, frequently found in the nose and skin of a person. About 20% of the population are long-term carriers of S. aureus . S. aureus ... ...

Hydatid

...tid Cysts A hydatid is a cyst that houses an intermediate form of the tapeworm Echinococcus granulosus. ... Hydatid cysts are typically spherical in shape and have the ... Hydatid disease primarily affects the liver and typically demonstrates ... Familiarity with atypical manifestation...

Eye

... Eyes are organs that detect light, and send signals ... 3.1 Simple eyes . 3.1.1 Pit eyes . 3.1.2 Pinhole eye . 3.1.3 spherical lensed eye . 3.1.3.1 Weaknesses ... The vertebrate retina is a light sensitive tissue lining the inner surface of the eye . The optics of ...

Emphysema

...wed or Emphysema — Comprehensive overview covers symptoms, causes, treatment and prevention of this ... As it worsens, emphysema turns the spherical air sacs ... Consumer health resource center providing an overview of emphysema and its causes, symptoms, and treatment. The Canadian Lung A...

Alveoli

... during consultations. " Alveolus " redirects here. For other uses, see Alveolus (disambiguation) ... In the lung, the pulmonary alveoli are spherical outcroppings of the respiratory ... Learn about bacterial pneumonia, its causes, symptoms, and treatments. ... When the inflammation occurs ...
Spherical in Biological News

Jet-propelled imaging for an ultrafast light source

...ysics at Cambridge University, discovered that a smooth, cylindrical jet of liquid emerging from an orifice spontaneously breaks up to form a train of spherical droplets. In the late 1990s, physicist Alfonso Gan-Calvo of the University of Seville found a way to surround the streaming liquid with pressurized ga...

Shape matters in the case of cobalt nanoparticles

...at changing the shape of cobalt nanoparticles from spherical to cubic can fundamentally change their behavior. ...oved. In the absence of a magnetic field, both the spherical and cubic nanoparticles spontaneously form chainsl...radually reduced to zero, the magnetization of the spherical nanoparticles in the columns also decreases gradua...

Photoselective film proves effective for controlling height in potted gardenia plants

... plants; the chemicals are used to reduce plants' internode length, and encourage the production of lateral shoots that create aesthetically pleasing, spherical plants with plentiful flower buds. Chemical sprays are effective at reducing gardenia plant height, but need to be applied regularlya practice that in...

Findings uncover new details about mysterious virus

... of the virus's capsid is slightly different than the others, whereas all sides are the same in a regular icosahedron. An icosahegron has a roughly spherical shape containing 20 triangular facets and 60 identical subunits. Like an icosahedron, the mimivirus capsid also has 20 facets. However, unlike an icos...

How Volvox got its groove

...unt of genetic differences between species. One of the earliest traits to evolve is the clear jelly-like substance visible between the cells of the spherical Volvox colonies, Herron said. "We think that stuff is what held the earliest multicellular colonies together." Banding together in a larger mass ...

Nanoparticle toxicity doesn't get wacky at the smallest sizes

...emistry that drives the biological responses doesn't change when you get down to the smallest nanoparticle." Nanoparticles are materials made up of spherical particles that are on average 100 to 1,000 times smaller than the width of a human hair. They are being used in tires, biomedical research, and cosmet...
Spherical in Biological Technology

Scientists discover 'dancing' algae

...view Letters . The researchers studied the multicellular organism Volvox, which consists of approximately 1,000 cells arranged on the surface of a spherical matrix about half a millimetre in diameter. Each of the surface cells has two hair-like appendages known as flagella, whose beating propels the colon...

Life sticks: UC San Diego bioengineer's sticky insights published in journal Science

...t biological structures that nevertheless rely on responsiveness to forces for proper function are leg bones and breast acini. Breast acini are hollow spherical objects at the ends of breast ducts that are made of a layer of cells that secrete milk proteins. Breast acini form hollow spheres, according to Engle...

Latest issue of Science: Nanosonar uses electrons to measure under the surface

... strong," said Dr. Samir Lounis from Forschungszentrum Jlich who turned the theoretical calculations into an experiment, "that they can be measured as spherical patterns on the surface using the scanning tunnelling The somewhat deformed rings on the surface allow us to draw direct conclusions on the shape o...

Latest issue of Science: Nano-sonar uses electrons to measure under the surface

... strong," said Dr. Samir Lounis from Forschungszentrum Jlich who turned the theoretical calculations into an experiment, "that they can be measured as spherical patterns on the surface using the scanning tunnelling The somewhat deformed rings on the surface allow us to draw direct conclusions on the shape o...

U of T physicists squeeze light to quantum limit

...perly studied," says Rob Adamson. "For the first time, we have demonstrated a technique for generating any desired triphoton state and shown that the spherical nature of polarization states of light has unavoidable consequences. Simply put: to properly visualize quantum states of light, one should draw them...

First U.S. Implants of Newly Approved Embozene(TM) Color-Advanced Microspheres Embolization Platform

...isibility. They are also available in a wider range of sizes than any other spherical embolic on the market. They are available in 40, 100, 250, 400, 500, 700, a...tant. Four design features distinguish Embozene(TM) Microspheres from other spherical embolics: biocompatibility, precise calibration, stable suspension, and str...
Spherical in Biological Products

Neural Stem Cell Expansion Kit - Monolayer from R&D Systems

Description:...ult brain (1 - 6). NSCs can be grown in vitro , in the presence of mitogen, as either monolayer cultures on an adhesive substrate or as free floating spherical aggregates termed 'neurospheres. These in vitro propagated NSCs can proliferate in culture while retaining the potency to differentiate into neurons...
Company:R&D Systems

Neural Stem Cell Expansion Kit - Neurosphere from R&D Systems

Description:...ult brain (1 - 6). NSCs can be grown in vitro , in the presence of mitogen, as either monolayer cultures on an adhesive substrate or as free floating spherical aggregates termed 'neurospheres. These in vitro propagated NSCs can proliferate in culture while retaining the potency to differentiate into neurons...
Company:R&D Systems

Neural Stem Cell Expansion Kit - Monolayer Plus from R&D Systems

Description:...ult brain (1 - 6). NSCs can be grown in vitro , in the presence of mitogen, as either monolayer cultures on an adhesive substrate or as free floating spherical aggregates termed 'neurospheres. These in vitro propagated NSCs can proliferate in culture while retaining the potency to differentiate into neurons...
Company:R&D Systems
Spherical in Biological Definition

Blastula

... The blastula is an early stage of embryonic development in animals . It is produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. The blastula follows the morula and precedes the gastrula in the development sequence. A blastu...

Gradient

... ξ f ( p ) will be: See also Jacobian Divergence Curl Partial derivation Vector calculus Nabla in cylindrical and spherical coordinates Ion gradient Gradient descent Level set ...

Lipid

...s form a single layer on the liquid surface and are dispersed in solution. At the first critical micelle concentration (CMC-I), the lipids organise in spherical micelles, at the second critical micelle concentration (CMC-II) into elongated pipes, and at the lamellar point (LM or CMC-III) into stacked lamellae ...

Microscope

...in both objective and eyepiece assemblies. These multi-component lenses are designed to reduce aberrations , particularly chromatic aberration and spherical aberration . In modern microscopes the mirror is replaced by a lamp unit providing stable, controllable illumination. Basic microscope ...

Potential energy

...s two terms: which evaluates to: [We may also want to link to an explanation of that second term (the gravitational forces created by hollow spherical shells)] A frequently adopted convention is that an object infinitely far away from an attracting source has zero potential energy. Relative to thi...

Varicella zoster virus

... The known envelope glycoproteins (gB, gC, gE, gH, gI, gK, gL) correspond with those in HSV, however there is not equivalent of HSV gD. VZV virons are spherical and 150-200 nm in diameter. Its lipid envelope encloses the nucleocapsid of 162 capsomeres arranged in a hexagonal form. Its DNA is a single l...
Spherical in Biological Dictionary

Zona pellucida

...round the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the The zona pellucida is the spherical glycoprotein shell that sur ... caused by direct titration of zona pellucida binding sites is suggested as an ... the structure and functio...

Yolk

...lated words. The noun egg yolk has one meaning: Meaning #1 : the yellow spherical yolk n. The yellow, usually spherical portion of an egg of a bird or reptile, surrounded by the albumen and s...

Spermatids

...Round spermatids were collected from the testicles of rats of both groups, the ... ( t) Newly formed Sa spermatids of stage I have the smallest spherical nuclei of ... ( y) The nucleus of Sc spermatids in stage VI has shortened to the typical length ... Silver grains are localized in elongating ...

Organelles

...iated structure within a cell, such as a mitochondrion, vacuole, or chloroplast, that performs a specific function mitochondrion n. , pl. -dria . A spherical or elongated organelle in the cytoplasm of nearly all eukaryotic cells, containing genetic material and These organelles allow the cell t...

Nucleus

...at serves as the information and administrative center of the cell. ... The spherical nucleus occupies about 10 ... The nucleus is a highly specialized organelle that serves as the information and administrative ... The spherical nucleus typically occupies about 10 percent of ... Explore the structu...

Nostoc

... Nostoc is a genus of fresh water cyanobacteria that forms spherical colonies composed of filaments of moniliform cells in a gelatinous sheath. When on the ground, a Nostoc colony is ordinarily not seen; but after a...
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