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Tag: "stress" at biology news

Rising ocean temperatures, pollution have oysters in hot water

...um. That makes sense, because the pollutant places stress on the oyster, which increases metabolism and oxyg...temperature and pollution combine to intensify the stress placed on the oyster's physiological system. In future experiments, the researchers will try to d...

Fast test for low blood flow in dogs detects early heart trouble

...y it took them less than half the time of exercise stress tests and echocardiograms currently used to find ...s technique, in which patients are given a drug to stress their heart during the scan, is undergoing clinical testing. Results among 60 patients are expected...

American scientist's research of life's first cells

... K. O'Shea at Harvard University where she studies stress response in yeast. Bernhard Loll (Europe): For his essay "Photosystem II, a bioenergetic nanomachine." Loll was born in Ravensburg, Germany. He studied chemistry at the Albert-Ludwigs University in Freiburg, Germany, and received his diploma d...

Scientists discover way to block growth of prostate cancer cells

... of the major causes of androgen-induced oxidative stress in prostate cancer cells," said Dr Basu. "The dis...ards increasing, rather than decreasing, oxidative stress in order to destroy established tumours. However, no one that I know has tried to reduce oxidative ...

Anticipation plays a powerful role in human memory, brain study finds

...of psychological conditions such as post-traumatic stress disorder (PTSD) and social anxiety, which are often characterized by flashbacks and intrusive memories of upsetting events. "The main motivation for this study was a clinical one, in terms of understanding and applying knowledge about memory so tha...

New brain-chemistry differences found in depressed women

...women in a brain-chemical system that's crucial to stress and emotions. The study adds further evidence th... "Women who had more pronounced responses in their stress response mechanisms during brain imaging also showed alterations in hormones, like cortisol, that ar...

Heart smart: new drug improves blood flow

...ny and the US have previously shown that oxidative stress - the appearance of free radicals in the walls of arteries - is a key mechanism underlying cardiovascular disease. "Free radicals contribute to the formation of arterial blockages. What's more, as the number of free radicals increases, they also in...

Bones at the nanoscale

...lecular rearrangements in bone while they applied stress using the techniques of X-ray scattering and diffraction in real time. The high brilliance of the X-ray source enabled the tracking of bone deformation in real time. Researchers could look at two length scales: on one side they observed the 100 na...

Underweight women at greater risk of miscarriage

...ch suggest that following a healthy diet, reducing stress and looking after your emotional wellbeing may all...to low pre-pregnancy weight, previous termination, stress and change of partner are noteworthy, and we suggest further work be initiated to confirm these find...

Scientists crack rhino horn riddle

...th surges but the effects of temperature, diet and stress on the growth are still unknown. The results of the horn growth study may be of interest to conservation groups whose goal is to strengthen rhino populations and reduce the poaching of horn for the black market. "Ultimately, we think our findings ...

Why don't all moles progress to melanoma?

...now, no one knew there was a connection between ER stress and the very early stages of tumor initiation." ...ing process, the system gets bogged down. This can stress or even kill the cell. To prevent this, the ER sends out distress signals to activate what scient...

Unique gene regulation gives chilly bugs survival advantage at bottom of the world

...nvironmental stress. Yet when most insects express stress proteins, it temporarily compromises the productio...her proteins, Denlinger said. "The production of stress proteins usually brings development to a halt," he said. "But in this case, the larvae merrily go ab...

Osteoarthritis may be sign of faster 'biological ageing'

... biological factors in common, including oxidative stress and low level chronic inflammation....

Low levels of neurotransmitter serotonin may perpetuate child abuse across generations

...ir lives and affects the offsprings's responses to stress in adulthood. In earlier research on abuse of infant monkeys, Maestripieri and his colleagues studied females that were switched at birth between abusive and non-abusive mothers. That research showed that the offspring of non-abusive mothers were ...

Stress hormones may play new role in speeding up cancer growth

...ggests that hormones produced as during periods of stress may increase the growth rate of a particularly nas...study showed that an increase in norepinephrine, a stress hormone, can stimulate tumor cells to produce two compounds. These compounds can break down of the t...

Fruit flies and global warming -- Some like it hot

...s in temperature. Short-term exposure to high heat stress ("heat hardening") has been known to have negative effects on Drosophila. But Loeschcke and Hoffmann discovered that it can have advantages too. Flies exposed to heat hardening were much more able to find their way to bait on very hot days than were ...

Cryoablation -- A new treatment option for some kidney tumor patients

...tal stay and recovery time very short and surgical stress is minimal." He cautions that this procedure is not ideal for everyone, noting that it is an option for only a relatively small subset of patients. Percutaneous ablation uses needles to penetrate the skin and deliver directly to the tumor either ...

Bacterial response to oxidation studied as toxin barometer

...h an overt reaction to toxins that cause oxidative stress show promise as a biosensor to predict public heal...es, heavy metals, and PCBs, kill through oxidative stress mechanisms, said Bev Rzigalinski, a pharmacologist with VCOM. Oxidative stress is caused by unbalanc...

Plants do not emit methane

...he mitigation potential of plants. The researchers stress that questions still remain and that the gap in the global methane budget needs to be properly addressed. ...

Scientists identify specific enzymes that make meningitis hard to fight

...ia and subject them to oxidative stress. Oxidative stress damages the base chemical compounds of the bacteria's DNA. This should lead to cell death and the defeat of the bacteria. However, the virulent meningitis bacteria are able to repair this harmful damage and are therefore unaffected by the body's defe...

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