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Tag: "radioactive" at biology news

New Clues Add 40,000 Years to Age of Human Species

...uired volcanic minerals with elements that undergo radioactive decay. Brown and McDougall collected rocks containing volcanic debris, which McDougall dated to approximately 195,000 years old. Forty years ago, radiometric dating methods were less accurate and suggested an age of roughly 130,000 years. No one w...

Poplar trees redirect resources in response to simulated attack

...hen administered carbon dioxide gas "labeled" with radioactive carbon-11 to individual leaves, where it is quickly converted to sugar, and traced the movement of this radiolabeled sugar through the plants using autoradiography and other techniques. Autoradiography allows for taking a snapshot in time showing the...

New Treatment Rivals Chemotherapy For Lymphoma, Study Finds

...herapy, on a cellular scale. Antibodies coupled to radioactive isotopes specifically seek out, bind to and kill c...f treatment with the Bexxar therapeutic regimen, a radioactive antibody injected into the bloodstream that targets and kills cancer cells. Of the 76 patients enrol...

PET/MRI scans may help unravel mechanisms of prenatal drug damage

...ly been "labeled," or "tagged," with a short-lived radioactive form of carbon (carbon-11). This radiotracer emits a signal that is picked up by the PET scanner, which takes snapshots of the tracer's location over time to show how much and how quickly the cocaine (and/or the metabolic byproducts that retain the c...

Brain Scans Reveal How Gene May Boost Schizophrenia Risk

...ing PET (positron emission tomography), which uses radioactive tracers to visualize brain function. The first scan measured subjects' overall brain activity while they performed working memory tasks. The second scan used a dopamine tracer to reveal the synthesis of the neurotransmitter in the midbrain. Frontal ...

Turning viruses into allies against cancer

...d to the virus acts as a kind of homing beacon for radioactive iodine, providing a second line of attack against ...ent with this combination followed by injection of radioactive iodine into the mice bearing the human hepatocellular cancer cells resulted in high uptake of the ra...

Study uncovers bacteria's worst enemy

...worst enemy in a nuclear waste site may not be the radioactive elements, but rather, the other toxic metals that might also be found at the site. The study also shows that contrary to the conventional wisdom, when it comes to these environmental bacteria, plutonium is less toxic than uranium and, in general, ac...

Amazon source of 5-year-old river breath

...pacted." No previous tropical study has used both radioactive carbon-14 and stable carbon-13 isotopes to address these questions. Funding from the Center for Accelerator Mass Spectrometry at Lawrence Livermore National Laboratory made the analysis by Mayorga and Aufdenkampe possible. The samples were collected ...

Researchers Discover That Microbes Can Produce Miniature Electrical Wires

...ter contaminated with pollutants such as toxic and radioactive metals or petroleum. They also have the ability to convert human and animal wastes or renewable biomass into electricity. To carry out these processes, Geobacter must transfer electrons outside the cell onto metals or electrodes. This new research pr...

Thinking the pain away? Study shows the brain's painkillers may cause 'placebo effect'

...lled carfentanil that is attached to a short-lived radioactive form of carbon, which releases subatomic particles known as positrons. These positrons are detected with the PET scanner, which acts like a photographic camera to capture those particles. It then determines exactly which part of the brain they origin...

Did humans cause ecosystem collapse in ancient Australia?

...nal neutron. There is even less 14C, the unstable, radioactive heavyweight of them all. "13C is the key," Fogel explained. "There are two main ways plants metabolize 13C . About 85% of plants belong to what is known as C3 photosynthesis group. This group incorporates less 13C than plants belonging to the second...

New tooth enamel dating technique could help identify disaster victims

...ovide a way to determine age at time of death The radioactive carbon-14 produced by above-ground nuclear testing in the 1950s and 1960s is providing forensic scientists with a more precise way to determine a person's age at the time of death. The method could help in the identification of victims of Hurricane ...

Firefly protein lets researchers monitor molecule linked to cancer

... the drug in the blood or to label the drug with a radioactive tracer. "In the case of NF-KappaB, there were also methods that monitored IKK activity via changes in the levels of gene activation at the end of the pathway," he notes. "But those took hours to days to deliver results, and our approach works contin...

The ecological effects of the Chernobyl disaster

...Marie Curie (France) measured the birds' levels of radioactive strontium and radioactive cesium, comparing migrating populations with those that remain in the area, as well as examining age...

Researchers find Amchitka seafood safe for now

...e Amchitka Island since the presence of long-lived radioactive materials will require long-term attention to a si...re is no currently known technology to address the radioactive shot cavities themselves; hence future surveillance is needed and the study serves to provide baseli...

Chernobyl: The true scale of the accident

...aded, posing a risk of collapse and the release of radioactive dust; * A comprehensive plan to dispose of tons of high-level radioactive waste at and around the Chernobyl NPP site, in accordance with current safety standards, has yet to ...

Magnetic probe successfully tracks implanted cells in cancer patients

...o guide the needle, and dendritic cells carrying a radioactive tag are sometimes used to try to double-check the ... the cells' location much more accurately than the radioactive tracking method and provided anatomic detail simultaneously -- structural detail not possible by tra...

PET imaging reveals the immune system at work

...es of the body by detecting radiation emitted from radioactive substances, such as fluorodeoxyglucose, injected into the body. In the work reported by Witte's group, PET was used to follow immune cells whose DNA included "reporter genes," genes engineered to help concentrate chemical tracers detectable by PET im...

Jefferson biologist coaxing human embryonic stem cells to make dopamine with simpler, faster method

...es of the body by detecting radiation emitted from radioactive substances, such as fluorodeoxyglucose, injected into the body. In the work reported by Witte's group, PET was used to follow immune cells whose DNA included "reporter genes," genes engineered to help concentrate chemical tracers detectable by PET im...

Carbon nanotube absorption measured in worms, cancer cells

...nomaterials developed to date---with the carbon-14 radioactive isotope, which enabled the nanotubes to be tracked and quantified as they were absorbed into living cells. Researchers used cancer cells called HeLa cells, and also measured nanotube uptake in an earthworm and an aquatic type of worm. The findings ...

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