Sentences with phrase «oxygen levels remain»

Our technicians will closely monitor your companion's vital signs to make sure their heart rate, blood pressure, respiratory rate and oxygen levels remain consistent.

Along with my colleagues Dave Johnston and Ann Pearson at Harvard and NASA's Felisa Wolfe - Simon, I hypothesize that biological feedback cycles, including one involving sulfide - based photosynthesis, would tend to maintain this world in which oxygen levels remain low and sulfide high [for the next «boring» billion years].

Not exact matches

«Evidence suggests that breastfeeding is less stressful to preterm babies than bottle - feeding, and that temperature and oxygen levels also remain more stable throughout breastfeeding.

In places where sea - floor oxygen levels are a bit higher — about 0.5 — 3 % of concentrations at the sea surface — animals are more abundant but their food webs remain limited: the animals still feed on microbes rather than on each other.

The oxygen level did not change for the familiar voice, which remained the same as baseline.

«Urban organics» thus remain at higher levels longer, says Canuel, «delivering more organic material to the river mouth and increasing the likelihood that low - oxygen conditions will develop in downstream locations such as estuaries and the coastal ocean.»

Indeed, the fetus remains for the most part sedated by low oxygen levels and anaesthetic chemicals that are produced by the placenta, says Lagercrantz.

Then, for reasons not well understood, the bottom fell out, oxygen plummeted to a tiny fraction of today's level, and the ocean remained mostly oxygen free for more than a billion years.

The oxygen and carbon isotopes present in the remains provided them with records of temperature and humidity levels during the period.

However, noise that remains in the rs - fMRI data after preprocessing has limited the reliability of individual - subject results, wherein scanner artifacts, subject movements, and other noise sources induce non-neural temporal correlations in the blood oxygen level - dependent (BOLD) timeseries.

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.

Coho fry remain in the creek for their first year, where they depend on slow - moving water, high oxygen levels in the water with adequate stream cover and abundant shelter to survive and develop the strength they will need for their migration into the ocean.

Then, for reasons not well understood, the bottom fell out, oxygen plummeted to a tiny fraction of today's level, and the ocean remained mostly oxygen free for more than a billion years.

After the organisms living in these waters died, their remains sank into a bottom layer of water characterized by low levels of dissolved oxygen.