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Tag: "surface" at biology news

Self-assembled nano-sized probes allow Penn researchers to see tumors through flesh and skin

...ze a tumor more than one centimeter below the skin surface using only infrared light. A team of chemists, bio...fluorescent materials called porphyrins within the surface of a polymersome, a cell-like vesicle, to image a tumor within a living rodent. Their findings, whic...

Protein offers way to stop microscopic parasites in their tracks

...are able to clip off sections of proteins near the surface of the cell membrane. Using other rhomboid proteases as guides, Brossier identified genes for five rhomboid proteases in Toxoplasma. Scientists showed that the parasite used at least four of those genes to make active proteases. When they looked at ...

LUCA technologies confirms real-time methane generation

...carbon deposits were less mature and closer to the surface of the earth. Luca scientists, employing the tools of modern biotechnology and genomics, have now shown that living methane generating, microbial consortia are present and actively forming methane within some of these hydrocarbon substrates. In addi...

Researchers devise way to mass-produce embryonic stem cells

...in three dimensions, while cells growing on a flat surface ?the bottom of the flask ?could not. "Cells grown on a flat surface don't act like they would in the body," Yang said. "The growing surface affects how a cell forms, wh...

Substance protects resilient staph bacteria

...joints and heart valves. A substance found on the surface of Staphylococcus epidermidis has, for the first time, been shown to protect the harmful pathogen from natural human defense mechanisms that would otherwise kill the bacteria, according to scientists at the Rocky Mountain Laboratories (RML), part of ...

Pulsating ultrasound enhances gene therapy for tumors

...uch as lasers and electric current, are limited to surface lesions or require needles to be inserted in the body. Pulsed-HIFU is non-invasive and can treat any area of the body accessible by ultrasound, the exceptions being the lungs and bones. Additional advantages of pulsed-HIFU include no scarring, limite...

A frog's life is food for thought

... survive on fat reserves. The frogs return to the surface after heavy rain, sometimes for as little as a wee...ation. "Despite the marked decrease in absorptive surface area of the gut of aestivating frogs, they appear to actually increase their absorptive capacity dur...

Polymers with copper show promise for implanted sensors

...d chemistry. In the bloodstream, clots form on the surface of implanted sensors or blood vessels contract aro...nction and prevents platelets from sticking to the surface of the blood vessels." Over the years, Meyerhoff and collaborators have developed nitric oxide-rele...

Robot-based system developed at Carnegie Mellon detects life in Chile's Atacama desert

...nsect and stopped occasionally to perform detailed surface inspection, effectively creating a "macroscopic quilt" of geologic and biological data in selected 10 by 10 centimeter panels. After the rover departed a region, the ground truth science team collected samples the rover had examined. "Based on the r...

Biodiversity hotspots identify conservation priorities

...n habitat covering just 2.3 percent of the Earth's surface (roughly equivalent to the combined areas of the five largest U.S. states). This habitat originally covered 15.7 percent of the Earth's surface, an area equivalent in size to Russia and Australia combined. The new analysis shows that an estimated 50 ...

50-year-old Mystery Solved: Protein Tags Regulate Key Ion Channel

...only in the nucleus -- also occurs near the cell's surface where it regulates at least one and possibly many ...ylation controls one important process at the cell surface and hints that it may influence others." Additional authors include co-first authors Sindhu Rajan a...

New component of the 'brakes' on nerve regeneration found

...chers knew that CNS neurons had receptors on their surface that accepted the inhibitory molecules--like a key fitting a lock--and switched-on inhibitory signaling within the neuron. They had also shown that a protein called p75 could function as a component of the complex of proteins that make up this recept...

New lab technique identifies high levels of pathogens in therapy pool

...ogenic, were enriched just inches above the pool's surface by as much as 60 percent. The microbes included "...ide hydrogen peroxide bubbles produced at the pool surface and were dispersed as the bubbles became airborne and burst. The hydrogen peroxide also eliminated m...

Survey finds silver contamination in North Pacific waters

...1.2 parts per trillion in samples of North Pacific surface waters taken during the cruise. This is about 50 times higher than baseline levels of silver in uncontaminated waters sampled by UCSC researchers on a previous cruise in the Atlantic Ocean. Because the natural background level is so low, scientists m...

Revolutionary nanotechnology illuminates brain cells at work

... fluorescent proteins, we placed the sensor on the surface of rat hippocampal cells. The hippocampus is the part of the brain that is involved with emotional reactions, and it helps store learned information in memory. When neurons are activated, they secrete glutamate, and we could see this activity under t...

NASA study finds snow melt causes large ocean plant blooms

...and and ocean during summer. As a consequence, sea surface winds over the Arabian Sea have strengthened leading to more intense upwelling and more widespread blooms of phytoplankton along the coasts of Somalia, Yemen and Oman. According to Goes, while large blooms of phytoplankton can enhance fisheries, exc...

Genetically Modified Natural Killer Immune Cells Attack, Kill Leukemia Cells

...fied the growing NK cells so they carried on their surface an artificial receptor that made them particularly...gnize a protein called CD19, which is found on the surface of leukemic cells. When the receptor bound to CD19 on leukemic cells, it set off a reaction that sup...

Nano-bumps could help repair clogged blood vessels

...es attach better to materials that possess smaller surface bumps than are found on conventional materials use...he researchers tested discs of titanium containing surface bumps about as wide as 100 nanometers ?or billionths of a meter. The metals used to make conventiona...

Study reveals new technique for fingerprinting environmental samples

...ht is a major energy source for microbes living in surface water there was an abundance of genes involved in photosynthesis in samples collected from shallow water. These differences in the abundances of genes involved in particular functions provide DNA clues to features of the environments from where the s...

NIH Researchers Discover How Insulin Allows Entry of Glucose Into Cells

...neath, illuminating the area just below the cell’s surface while leaving the inside of the cell dark. “When we started the experiment, we thought that the vesicles would be stationary,?Dr. Zimmerberg said. “The vesicles looked like comets streaking by.?/p> Dr. Zimmerberg added that studying the chemical...

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