Thus evolution is a theory that is used to explain biological, genetic, and
chemical changes affecting organisms of all types.
This may explain why identical twins tend to show more differences as they get older and don't spend as much time together — their natural
chemical changes affect their development as individuals.
Not exact matches
Ultrasound machines don't use radiation and cause no known physical or
chemical changes that could
affect your baby.
Scientists also speculate that natural
chemical changes in our genetic material may
affect the way certain genes dominate.
Changes in the brain's
chemicals can also
affect how a person feels.
It's common to have mood swings during pregnancy, partly because of hormonal
changes that
affect neurotransmitters (
chemical messengers in the brain).
During pregnancy, hormone
changes can
affect brain
chemicals and cause depression and anxiety.
Other molecular
changes —
chemical tags added to DNA or to proteins called histones — may
affect health without injuring DNA.
Meanwhile, the new study suggests the effect will intensify in the future with continued climate
change, based on computer models that attempt to project how rising temperatures would
affect the Arctic's
chemical reservoirs.
It notes «[a] ir impacts that could
affect respiratory health,» for example, and «[c] limate
change impacts due to methane and other volatile organic
chemical releases.»
Later in life the genetic material can be
changed by epigenetic modifications, i.e.
chemical alterations of the DNA the
affect the activity of the genes.
A multicenter team of researchers reports that a full genomic analysis of tumor samples from a small number of people who died of pancreatic cancer suggests that
chemical changes to DNA that do not
affect the DNA sequence itself yet control how it operates confer survival advantages on subsets of pancreatic cancer cells.
They found that both bunch rot and powdery mildew caused nuanced
changes in the composition of (
chemical) aroma substances,
changing the odor of the wines to the point where the wines» aroma quality was significantly
affected.
Epigenetic modifications are
chemical changes to DNA that
affect how genes are regulated.
During development, chromosomes are subject to
chemical changes that don't
affect the nucleotide sequence but can turn genes on or off; the best known example is methylation, in which a methyl group is attached to specific DNA regions.
Now plant biologists and immunologists at York have joined forces to examine a very closely related family of these small molecules (flavonoids) to establish how tiny
changes to their
chemical structures
affect their bio-activity.
Wherever they gather, mitochondria
change the local
chemical microenvironment: They cause a lower pH, and that small
change, Van Blerkom believes, can
affect the local activity of certain enzymes.
Professor Sinclair said: «It is well established that prior to conception and in the early stages of pregnancy during natural or assisted reproduction subtle
chemical changes can
affect the human genome leading to development and late - onset chronic diseases.
DNA methylation and other epigenetic alterations —
chemical changes to DNA that can alter a gene's expression without
affecting its protein - coding sequence — may underlie some of the lasting biochemical havoc, Ghanei says.
Researchers showed that the
changes imposed by different pathophysiology specifically
affect the top of the functional hierarchy, at the level of
chemical species.
Curiosity is climbing a layered Martian mountain and finding
chemical evidence of how ancient lakes and wet underground environments
changed, billions of years ago, in ways that
affected their potential favorability for microbial life.
However, small
changes in the
chemical composition of particles can
affect the environment.
The silicate + CO2 - > different silicate + carbonate
chemical weathering rate tends to increase with temperature globally, and so is a negative feedback (but is too slow to damp out short term
changes)-- but
chemical weathering is also
affected by vegetation, land area, and terrain (and minerology, though I'm not sure how much that varies among entire mountain ranges or climate zones)-- ie mountanous regions which are in the vicinity of a warm rainy climate are ideal for enhancing
chemical weathering (see Appalachians in the Paleozoic, more recently the Himalayas).
«We are interested in understanding how sunlight
affects the
chemical composition of organic particles,» said Dr. Adam Bateman, who worked on this and other global
change studies.
A mesocosm experiment by scientists from GEOMAR Helmholtz Centre for Ocean Research Kiel, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Bremerhaven (AWI) and the Institute for Baltic Sea Research Warnemünde (IOW) reveals for the first time how ocean
change might
affect the special physical,
chemical and biological characteristics of the ocean's uppermost boundary.
«The privileged position of industry to craft language in the trade agreement without public input, and the unlimited potential of TTIP to
affect the ability of countries to regulate on toxic
chemicals, energy and climate
change, food and agriculture and other critical issues.»
This type of cooperative
chemical communication, in which a molecule binding at one site influences
chemical activity at another site on the enzyme, is driven by structural and bonding
changes and
affects the function of the biocatalysts.
Long - term use also causes
changes in other brain
chemical systems and circuits as well,
affecting functions that include:
Studies link the latter to mood
changes and memory issues; an uptick in inflammatory
chemicals can
affect your nervous system.
We believethat these microbiome - induced
chemical changes may in turn
affect behavior, by, for example, alleviating anxiety.
Environmental
chemicals, lack of dietary fiber, excess dietary fat, estrogens in cow's milk, lack of plant - derived phytoestrogens, and resulting obesity are some of the means by which diet adversely
affects hormones.6 - 10 Most importantly, when a woman
changes to a low - fat, plant - food based diet her reproductive hormones correct and most troublesome female problems, like heavy menstrual bleeding, fibrocystic breast disease, and PMS are alleviated.
Many people have no clue that
changes in hormone production are
affecting them in multiple ways, and that balancing these delicate
chemical levels can improve a wide array of problems, including libido and sexual performance.
Genetic
changes that
affect the body's ability to process food preservatives (and other environmental
chemicals) have also shown to play a role.
To avoid these negative epigenetic
changes that may
affect not only your health but also that of your children and grandchildren, it is important to make lifestyle
changes to reduce your
chemical exposure.
If the trachea is
affected by cigarette smoke,
chemical irritants or dust, the owner will be asked to
change the dog's living environment.
CDS is believed to be caused by physiological and
chemical changes in the brain of aging dogs that
affect brain function.
Just as the miner's canary alerted mine workers to poison gases in a shaft, natural areas can alert us to biological,
chemical, and environmental
changes that will
affect our quality of life and the survival of species.
When
changing the players, the users can flick the Right Stick to the right so as to view how the swapping will
affect the
chemical composition of the other stakeholders.
The temporal effect of
chemical, biological and physical forces applied to his work
affect the original materials and
change their form to produce a feeling of atmosphere and endlessness, while beauty and sensual value take on significantly different properties.
Chemical processes that may
affect CO2 uptake include
changes to the CO2 buffering capacity (Sarmiento et al 1995) and the effects of temperature on CO2 solubility.
The upper atmosphere is generally cooling and contracting, and related
changes in
chemical composition are
affecting the ionosphere.
One theory of many behind the solar / volcanic connection is that MUONS, a by product of galactic cosmic rays can
affect the calderas of certain volcanoes by
changing the
chemical composition of the matter within the silica rich magma creating aerosols which increase pressure in the magma chamber and hence lead to an explosive eruption.
So Monckton and Salby have discovered that real, long - term, natural, climate
changes will
affect our atmosphere's
chemical composition.
These include solar - related
chemical - based UV irradiance - related variations in stratospheric temperatures and galactic cosmic ray - related
changes in cloud cover and surface temperatures, as well as ocean oscillations, such as the Pacific Decadal Oscillation and the North Atlantic Oscillation that significant
affect the climate.
Changes in ozone depletion may also
affect climate
change, and many of the
chemicals involved in ozone depletion and their substitutes also can influence climate.
Jim, the bottom line for me is that for the earth to be in radiative thermal equiibrium with the sun, it has not been demonstrated that any
change in
chemical composition of the earth or atmosphere is able to
affect the equilibrium temperature, providing this does not
change albedo.
Here we examine the hypothesis4 that CO2 variations arose from
changes in ocean circulation that
affected the distribution of
chemical properties and thus of P CO 2 in the surface waters of the world ocean.
Changes in global weather patterns (e.g. El Nino events or global warming) can alter breeding behavior,
affect reproductive success, decrease immune functions and increase amphibian sensitivity to
chemical contaminants.
The collaborative international project began in 1993 as an effort to address how Amazonia functions as a regional entity within the larger Earth system, and how
changes in land use there might
affect the region's biological,
chemical, and physical functions and influence global climate.
As a smaller fraction of the excess CO2 goes into the oceans, a larger fraction may remain in the atmosphere, and the
chemical changes in seawater that can
affect organisms will continue to grow in lockstep with the relentless increases in the excess CO2 in the overlying atmosphere caused by human activities.