Sentences with phrase «oxygen species at»

Davis and his colleagues are able to shut off cheap oakley reactive oxygen species at the source by targeting the NOX (NADPH oxidase *) enzymes that produce them.

«Muscles maintain proper function by producing reactive oxygen species at the right time: Study results underscore the importance of having a nuanced view of antioxidants.»

Not exact matches

«These data are fully in accord with recent work on the actions of reactive oxygen species in cells, although clearly at odds with the popular concept that dietary antioxidants are inevitably beneficial,» says Malcolm Jackson at the University of Liverpool, UK, who was not involved in the research.

The crew found the three new species of Loricifera (jellyfish - like animals less than a millimeter long) in the sediment of L'Atalante Basin, a zone of salty, oxygen - depleted water at the bottom of the Mediterranean.

Published in the Proceedings of the National Academy of Sciences, the study found that many species from the two plateaus underwent different mutations to produce the same result: hemoglobins more adept at snaring oxygen from the lungs before sharing it with the other organs that depend on it.

Lead author Rich Brill, a fishery biologist with NOAA's National Marine Fisheries Service and adjunct faculty at VIMS, says «The notion that blue crabs are relatively intolerant of oxygen - poor waters was counterintuitive, because this species often occupies estuarine environments that can become hypoxic even in the absence of human activities.»

This oxygen species then chips away at cellulose, allowing the difficult - to - degrade biomass to be broken down.

«Our work highlights the need to take a nuanced view of the role of reactive oxygen species, as they are necessary when they are present at the right place and right time.

«Reactive oxygen species are an essential part of the biochemistry of life,» says senior author Gyorgy Hajnoczky, M.D., Ph.D., Professor at the MitoCare Center of the Department of Pathology, Anatomy and Cell Biology at the Sidney Kimmel Medical College of Thomas Jefferson University.

Not only can they hide from mackerel amongst the jellies» stinger - covered tentacles when they rise from the seafloor to feed and digest at night, they can also survive for hours within the ocean floor's low - or no - oxygen muds, which are pervaded by poisonous hydrogen sulfide gas — an inhospitable place lacking any other vertebrate species.

In addition to some previously described nematodes, which scientists had never before seen living at this extreme depth, the researchers discovered a new species of nematode that subsists on microbes and requires only trace amounts of oxygen.

Although the Cambrian explosion generated a large number of new phyla of Earth - type life, it actually crashed in a mass extinction not long after it began when oxygen levels fell and hydrogen sulphide levels rose again so that biodiversity at the family, genus, and species levels was decreasing around 515 million years ago (Gill et al, 2011; and Michael Marshall, New Scientist, January 5, 2011).

Reactive oxygen species (ROS) induce cellular damages at different levels (proteins, DNA, and lipids) which increase the body susceptibility to noxious injuries with the final result to accelerate aging and decrease lifespan.

Abstract: Gain - of - function mutations in the presenilin - 1 (PS - 1) promote Alzheimer's disease (AD) by increasing reactive oxygen species, at least part of which is derived by an accompanying increase in generation of amyloid - β (Aβ).

Gain - of - function mutations in the presenilin - 1 (PS - 1) promote Alzheimer's disease (AD) by increasing reactive oxygen species, at least part of which is derived by an accompanying increase in generation of amyloid - β (Aβ).

This primary response involves the production of reactive oxygen species (ROS), which are molecules that can act like tiny bombs when released by the plant cell at the offending pathogen.

At the cellular level, p53 can either induce senescence or, of major interest here, inhibit senescence by controlling both reactive oxygen species (ROS) levels and a signaling pathway mediated by protein kinases AMPK and mammalian target of rapamycin (mTOR).

The addition of this pendant catalyst created an MnP - PVPON / TA capsule with the following characteristics: 1) the microcapsules synergistically remove reactive oxygen species, including superoxide and hydrogen peroxide, at dramatically increased rates compared to unmodified TA / PVPON microcapsules; 2) the microcapsule does not degrade with long exposure to reactive oxygen species; and 3) the microcapsules are nontoxic to mouse splenocytes.

Because snow leopards successfully live at such high altitudes (3500m to 6500m) for many years researchers thought the haemoglobin of this species was in some way adapted so it could carry more oxygen than the haemoglobins of other big cats.

At Emory, Kathy Griendling's group is well known for studying NADPH oxidases (also known as Nox), enzymes which generate reactive oxygen species.

«Past studies have shown that having low antioxidant levels and increased reactive oxygen species — chemical products that bind to body cells and cause damage — is related to more severe PAD,» said Matthew Muller, postdoctoral fellow in Larry Sinoway's lab at Penn State College of Medicine, and lead author of the study.

Research had shown that increased mitochondrial activity may be at least partly responsible for extending the life span of yeast, roundworms, fruit flies and some mammals — perhaps by reducing the production of disease - causing reactive oxygen species (ROS).

THE PEAK OF OXYGEN CONSUMPTION AT THE TIME OF SPERM PENETRATION IS ASSOCIATED WITH AN INCREASE IN REACTIVE OXYGEN SPECIES PRODUCTION IN BOVINE ZYGOTES.

There are many species, and while they're not known as one of the best houseplants for purifying indoor air, like aloe vera, they cleanse the air at night by producing oxygen and removing carbon dioxide.

At the same time, autophagy helps to remove dysfunctional mitochondria, which would otherwise produce harmful reactive oxygen species.

We also don't want to down regulate an immune response at times with the body is using reactive oxygen species to say fight a pathogen.

For example, KBs were recently reported to act as neuroprotective agents by raising ATP levels and reducing the production of reactive oxygen species in neurological tissues, 80 together with increased mitochondrial biogenesis, which may help to enhance the regulation of synaptic function.80 Moreover, the increased synthesis of polyunsaturated fatty acids stimulated by a KD may have a role in the regulation of neuronal membrane excitability: it has been demonstrated, for example, that polyunsaturated fatty acids modulate the excitability of neurons by blocking voltage-gated sodium channels.81 Another possibility is that by reducing glucose metabolism, ketogenic diets may activate anticonvulsant mechanisms, as has been reported in a rat model.82 In addition, caloric restriction per se has been suggested to exert neuroprotective effects, including improved mitochondrial function, decreased oxidative stress and apoptosis, and inhibition of proinflammatory mediators, such as the cytokines tumour necrosis factor - α and interleukins.83 Although promising data have been collected (see below), at the present time the real clinical benefits of ketogenic diets in most neurological diseases remain largely speculative and uncertain, with the significant exception of its use in the treatment of convulsion diseases.

Oxygen decline in ocean and atmosphere gets so little that only very few species can adapt or survive at all.

Some earth scientists call that atmospheric jolt the great Oxygen Catastrophe, because the buildup of oxygen was toxic to most other species at theOxygen Catastrophe, because the buildup of oxygen was toxic to most other species at theoxygen was toxic to most other species at the time.

However, it's natural for living organisms to trash the planet as they divide and consume — just look at all of the organisms that went extinct over 2 million years ago when selfish photosynthetic bacteria began spewing oxygen into the atmosphere and eradicating countless species of anaerobic bacteria.

Auroral emissions typically occur at altitudes of about 100 km (60 miles) and are often green, white, or reddish in colour depending on what species (atomic oxygen, molecular oxygen, or nitrogen, respectively) is primarily emitting light.

But pollution also covers hundreds of chemicals which are fine or even beneficial at low levels but which if released in large quantities or in problematic circumstances cause «harm» — like phosphorus (grows your veges but also leads to toxic cyanobacterial blooms which kill cattle), nitrogen (grows crops kills many native species of plants and promotes weed growth costing farmers), copper (used as an oxygen carrier by gastropods but in high concentrations kills the life in sediments which feed fish), hormones like oestrogen (essential for regulating bodies but in high concentrations confuse reproductive cycles especially with marine life) or maybe molasses from a sugar mill (good for rum but when dumped into east coast estuaries used to cause oxygen sag in estuaries leading to massive fish kills).

The lower Chesapeake Bay is especially at risk due to high rates of sinking land (known as subsidence).96 Climate change and sea level rise are also likely to cause a number of ecological impacts, including declining water quality and clarity, increases in harmful algae and low oxygen (hypoxia) events, decreases in a number of species including eelgrass and seagrass beds, and changing interactions among trophic levels (positions in the food chain) leading to an increase in subtropical fish and shellfish species in the bay.66

Most aquatic species can not survive at such low oxygen levels.