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Tag: "calcium" at biology news

Soils offer new hope as carbon sink

...oil pH at about one-third the rate of lime, lifted calcium levels and reduced aluminium toxicity on the red ferrosol soils of the trial. "Soil biology improved, the need for added fertiliser reduced and water holding capacity was raised," he said. The trials also measured gases given off from the soils a...

Healthy coral reefs hit hard by warmer temperatures

...f live atop a limestone scaffolding built from the calcium carbonate secretions of each tiny coral, or polyp. While polyps provide the framework, coral's vivid hues come from symbiotic single-celled algae that live in the polyps. The algae supply much of the food coral need to survive. When disease or str...

Slowing the racing heart

... down the heart rate. "The enzyme works through calcium and potassium channels that we know to be key players in the generation and regulation of the pacemaker activity," said Ke. "Although adrenaline and other mechanisms that accelerate the heart rate have been well studied, mechanisms that might act ...

Fast and slow -- How the spinal cord controls the speed of movement

...rds with a fluorescent dye, which then lit up when calcium ions flooded in as the nerve cells activated. A confocal microscope with lasers allowed the researchers to image the cells at very high resolutions. Using this set up, they watched nerve cells light up as the animals moved at different speeds. Whi...

Protein overexpression at heart of heart failure

... primary trigger for cardiac [Ca2+]i transients is calcium entry through the pore subunit of the voltage-dependent L-type channels (L-VDCC), but their role in heart failure is still controversial. Electrophysiological studies on individual L-VDCCs from failing human heart have revealed an increased single-ch...

Bioluminescence at the service of a novel cerebral imaging technique

...oring of neuronal activity (and more specifically, calcium activity), real-time and in-vivo, in either a smal...mit light (a photon) when there is a change to the calcium concentration in a cell; for example, following neuronal activation. This makes it possible to foll...

Researchers urge monitoring of bone health during chemotherapy

...ss when needed. And patients should consume enough calcium and vitamin D and get sufficient exercise to maintain strong bones." Weilbaecher and her colleagues found that when they gave mice an eight-day course of the growth factor, called granulocyte colony-stimulating factor (G-CSF), the mice lost bone m...

Biologists prove critical step in membrane fusion

..." Wessel said. "So all that is needed is a puff of calcium from within the cell and fusion is complete. The process is quick because of hemifusion ?the vesicles are right there and ready to go." Wong and Wessel said that their findings might help scientists find new ways to deliver drugs to cells. If memb...

Researchers hot on the trail of brain cell degeneration

...lls be over-stimulation depends on excess entry of calcium into the cells. Researchers have long been trying ...s to reduce the cell destruction signals caused by calcium entry. Finding new targets for medicine development is also significant in terms of the economy, owi...

Lead with a poisonous electron shield

... important role in regulating and transporting the calcium cation in the human body. A calcium ion binds to seven ligands at the active centers of the enzyme. If one of the four possible calcium ...

DNA layer reduces risk of reserve parts being rejected

...layer was also found to speed up the deposition of calcium phosphate and could, for example, be adapted to promote bone and blood vessel formation. The good research results led to the patenting of DNA coatings for implants. A biomedical company is currently investigating whether they can take over the paten...

New dopamine brain target discovered

...of a Gq/11-coupled signalling unit that triggers a calcium signal, which is turned on by stimulating D1 and D...ith dopamine or specific drugs triggered a rise in calcium in the brain. As calcium has a profound effect on almost all brain function, this rise in calcium c...

A sweet step toward new cancer therapies

...group has been exploring the use of metals such as calcium and iron to carry the necessary positive charges. In a series of recently published papers, they first showed that their method can be used to selectively cleave different bonds and then demonstrated that it can be used to identify sulfate-laden prot...

Decoy pill saves brain cells

... a chain reaction that raises the concentration of calcium and activates calpain, among other toxic enzymes. ... feedback loop that leads to ever-higher levels of calcium and continuous calpain activation. In addition, by cutting mGluR1?, calpain eliminates its neurop...

Scientists crack rhino horn riddle

...in Athens and found dense mineral deposits made of calcium and melanin in the middle. The calcium deposits make the horn core harder and stronger, and the melanin protects the core from breakdown by...

Researchers seek to design first treatment for neuroAIDS

...man trials. These include antioxidant medications, calcium channel antagonists, NMDA antagonists like the Alzheimer's drug Memantine, platelet activating factor (PAF) inhibitors, and in the case of the new grant, drugs that inhibit glycogen synthase kinase 3 beta (GSK-3b) and mixed lineage kinase (MLK). "Th...

Tarantula venom and chili peppers target same pain sensor

...nel opens, allowing a stream of charged sodium and calcium molecules to rush into the nerve cell. This genera...ron cell cultures, measuring the tell-tale rush of calcium ions when the venom peptides contacted the TRPV1 capsaicin receptor. They also showed that synthetic...

Tracing the formation of long-term memory

...n fruit flies can be demonstrated by the influx of calcium into cells called mushroom body neurons that occur...y’s brain. "Before training, we could see some calcium flowing into the mushroom body neurons when the flies were exposed to odor," said Davis. When they e...

A new approach to growing heart muscle

...were bathed in a solution that included additional calcium and a drug that acts on beta-adrenergic receptors. Both are important to the signaling required to produce cohesive action by cells in tissue. The U-M team also assessed the BEHM's structure and function at different stages in its development. Fir...

A green way to slag off bunnies

...grazing damage fell by more than half. Slag ?or calcium silicate ?a plentiful byproduct of blast furnaces, is dirt-cheap and environmentally friendly. What’s more, it’s already known to act as an effective fertilizer in rice paddies and sugar cane fields. And as it’s not an active chemical, it could circu...

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