Sentences with phrase «change in concentration»

To me the very fact that we have been inducing major changes in the concentration of greenhouse gases is alarming.
Various mouse lines have been developed to express proteins that can be used to visualize changes in concentrations of calcium, which increase when neurons become active.
CO2 needs to get mixed into the atmosphere and changes in concentration reach the upper atmosphere.
We can estimate total change in concentration by integrating backwards in time.
Earlier changes in the concentration contributed to both the initial and final values of both concentration and temperature.
As to the specific papers you cited, Miller et al 2006 states,» Recent changes in the magnitude of the annular patterns have been interpreted as the signature of anthropogenic forcing by changes in the concentration of greenhouse gases (GHGs) or else stratospheric ozone [Shindell et al., 1999; Fyfe et al., 1999; Kushner et al., 2001; Kindem and Christiansen, 2001; Sexton, 2001; Gillett and Thompson, 2003; Shindell and Schmidt, 2004; Arblaster and Meehl, 2006].»
Susan Solomon and colleagues at the US National Oceanic and Atmospheric Administration combined satellite measurements and weather balloon data to track changes in the concentration of water vapour 16 kilometres up in the stratosphere, between the 1980s and today.
They rapidly detect and continuously respond to extremely small changes in the concentrations of gases including ammonia, carbon dioxide, and nitrogen oxide.
Because changes in concentrations of reproductive hormones may affect your pet's risk of developing certain diseases and conditions in the future, your veterinarian will advise you on both the benefits and risks of the sterilization procedure.
3 Further complicating the response of the different atmospheric levels to increases in greenhouse gases are other processes such as those associated with changes in the concentration and distribution of atmospheric water vapor and clouds.
That a simple change in the concentration of food could lead to such unusual behavior speaks to how prey density can drive the evolution of new hunting strategies, Cade suggested.
Kirk used these post-Katrina shifts — driven by an outside natural disaster rather than internal forces such as rising poverty or gentrification — to see whether changes in the concentration of people just out of prison affected reincarceration rates.
Changes in these concentrations indicated successful pump activity, and could be used to quantify the pumping efficiency.»
To do so, they studied the relative change in concentration of guidance cues in the neuron's environment, which is referred to as the steepness of the gradient.
Instruments on the platforms will monitor changes in the concentrations of gases such carbon dioxide, which is mainly produced when vegetation is burnt during the dry season.
RADICAL THEORY Changes in the concentration of a highly reactive compound in the atmosphere called hydroxyl may be to blame for a rise in global methane levels since 2007, new research suggests.
Jessell's work has revealed how gradual changes in the concentration of secreted signalling factors induce and steer the molecular switches that turn genes on and off to determine the identity of specific neuronal subtypes, as well as the precise positions in which they are generated.
With swarms of these receptors on their surfaces, cells can sense changes in the concentration of chemicals and tell in which direction gradients point.
Stochastic gene expression Within the confines of individual cells, minute changes in the concentration or spatial arrangement of molecules can produce substantial effects.
The extent to which temperatures will rise due to a given change in the concentration of greenhouse gases is known as the «climate sensitivity,» and you may find it useful to search for this term when doing your own research.
Indeed, methane acts as a small positive feedback during past warm periods (but with very limited magnitude in watts per meter squared when converting changes in concentrations into radiative forcing between different past interglacial periods).
So a difference of 1 unit represents a ten fold change in concentration.
Indeed, strong observational evidence and results from modeling studies indicate that, at least over the last 50 years, human activities are a major contributor to climate change.Direct human impact is through changes in the concentration of certain trace gases such as carbon dioxide, chlorofluorocarbons, methane, nitrous oxide, ozone, and water vapor, known collectively as greenhouse gases.
In terms of how I got the numbers, I integrated the rate of anthropogenic CO2 emission to measure the total CO2 emitted versus time, then compared it to the % change in concentration level.
[38] Radiative forcing quantifies the effect of factors that influence Earth's energy balance, including changes in the concentrations of greenhouse gases.
The transition between the Late Eocene and the Oligocene epochs (between 34 million and 33.5 million years ago) was triggered in part, the authors write in their April 22 paper in Proceedings of the National Academy of Sciences, by changes in the concentration of atmospheric CO2 that enabled ice to build up on the Antarctic continent.
When these feelings of sadness, change in concentration, guilt, decreased energy, hopelessness and appetite changes extend beyond two weeks after birth, doctors worry about postpartum depression.
He divided the communities into two groups — those that experienced no change in the concentration of parolees and those that experienced a change between late 2005 and late 2007.
Then, they examined the change in concentrations of minority discharges at minority - serving hospitals and tracked the movement of «safety - net hospital users,» or patients with at least four hospitalizations within the study period.
Taking factors such as sea surface temperature, greenhouse gases and natural aerosol particles into consideration, the researchers determined that changes in the concentration of black carbon could be the primary driving force behind the observed alterations to the hydrological cycle in the region.
The presence of, or changes in the concentration of, certain proteins in biological fluids can be indicators of disease.
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