The hypotheses were then tested empirically in a variety
of different study populations, including U.S. military veterans of the Vietnam war, college fraternity and sorority members who had undergone hazing, English Premier League football fans, martial arts practitioners of Brazilian Jiu Jitsu who sometimes use painful belt - whipping, and twins to examine the level of fusion.
Not exact matches
The IARC acknowledges the difficulty
of determining causality, but their report concludes that, «the consistent associations
of colorectal cancer with consumption
of processed meat across
studies in
different populations, which make chance, bias, and confounding unlikely as explanations.»
In a new
study published on 19 February in the open access journal PLOS Biology, researchers show that similar — or even identical — mutations can occur during diversification in completely separate
populations of E. coli evolving in
different environments over more than 1000 generations.
In a new
study published on 19 February in the open access journal PLOS Biology, researchers show that similar - or even identical - mutations can occur during diversification in completely separate
populations of E. coli evolving in
different environments over more than 1000 generations.
Planned variation
studies, in which program components, content, home visitor training, or dosage
of services is varied, can identify core dimensions
of implementation that are critical for achieving program impacts, as well as dimensions that could be adapted for
different contexts and
populations without threatening the program's effectiveness.
While there was some variation between the
populations that were
studied, such as between men and women, people living in
different regions, or people with
different risk factors, the researchers found that nut consumption was associated with a reduction in disease risk across most
of them.
Eighty percent
of a
population of Burmese long - tailed macaques on an island in southern Thailand use stone and shell tools to crack open seafood, and do so using 17
different action patterns, according to a
study published May 13, 2015 in the open - access journal PLOS ONE by Amanda Tan from Nanyang Technological University, Singapore, and colleagues, under an 8 year field project led by Michael D Gumert, also from NTU.
The authors caution that further
study and replication
of their results in
different populations is needed to verify their model before it will be useful for individual genetic tests — or before longevity «cocktails» are created.
Although the new JNCI
study did not analyze individual cell phone usage — preferring instead to take a broader look at the
population at large — other research has examined subgroups
of cell phone users to try to discern
different trends among more frequent use.
Now, a team
of scientists at the Icahn School
of Medicine at Mount Sinai have developed the Just EGFP Death - Inducing T - cell, or JEDI T - cells, which enable the visualization
of T - cell antigens, allowing researchers to
study T - cell interactions with
different cell types, model disease states, and finally determine the functions
of otherwise poorly characterized cell
populations.
They then compared their predictions with field
studies of more than 1000 lizard
populations on four
different continents.
Human epidermal equivalents representing
different types
of skin could also be grown, depending on the source
of the stem cells used, and could thus be tailored to
study a range
of skin conditions and sensitivities in
different populations.»
According to an extensive genomic
study, the two types
of population result from tens
of thousands
of years
of adaptation to their
different environments.
Next, they used a technique called fluorescence - activated cell sorting to separate out the newly differentiated retinal ganglion cells from a mixture
of different cells into a highly purified cell
population for
study.
That trend is problematic considering that African - Americans — the most at - risk
population for multiple myeloma — have
different genetics that can affect how this type
of cancer progresses and what kind
of targeted therapies are most effective, said Zarko Manojlovic, lead author
of the
study.
Researchers in this
study used budding yeast, creating
populations of cells with more than 10 million
different randomised genomes, to investigate how genetic diversity affected resistance.
Overall, the
study's data from mitochondrial DNA —
different from nuclear DNA in that it helps scientists trace maternal lineages — reveal that
population structure in humpback whales is largely driven by female whales that return annually to the same breeding grounds and by the early experience
of calves that accompany their mothers on their first round - trip migration to the feeding grounds.
This may be due to
different study designs,
population variation in vitamin D levels, or a failure to account for the combined effect
of exposure and underlying genetic variation in the vitamin D pathway.
So researchers may have to duplicate their
studies in
different populations to take account
of important geographical variations.
«Some
of the students in our
study didn't know that what they were experiencing was
different from the rest
of the
population, and it blew their minds,» says Jared Medina, assistant professor in UD's Department
of Psychological and Brain Sciences.
Hardy went to GS6 looking for possible international collaborators to continue her
studies of breast cancer across
different populations.
The
study's researchers use DALYs, or disability - adjusted life years, to compare the health
of different populations and health conditions across time.
The researchers looked at a total
of 142 publications from 95
different population studies that
studied the relationship between consumption
of fruits and vegetables and the subsequent risk
of chronic diseases.
The research teams, led by Nima Sharifi, M.D.,
of the Cleveland Clinic Lerner Research Institute,
studied the role
of the HSD3B1 (1245C) genetic variant in two
different prostate cancer patient
populations, following androgen deprivation therapy (ADT).
In an attempt to answer the question
of whether genes that show high levels
of variability across
different species could also be useful in
population - level evolutionary
studies, scientists in Brazil, Singapore, and the United Kingdom teamed up to test the utility
of numerous genes previously found to be useful in inferring relationships
of cactus species.
With no meat, milk, eggs, fish, or cheese in our diets, the U.S.
population would not receive enough
of several
different essential dietary nutrients from the foods they eat, according to the
study results.
«We found that the relatively homogeneous
population seen across western Eurasia today, including Europe and the Near East, used to be a highly substructured collection
of people who were as
different from one another as present - day Europeans are from East Asians,» said David Reich, professor
of genetics at Harvard Medical School and co-senior author
of the
study.
Co-author, Eva Phillip, from the University
of Kiel, says: «The
study shows that it is important to investigate
different ages
of a
population to understand
population wide changes and responses.
If we take as the reference the values relating to men in order to compare both genders, as men are faster and have more stamina, we might be led to believe that women «don't give all they've got,» but «we are in no doubt that women do give the maximum; so if this is relativized to the actual values
of the
population being
studied, the results would be
different with respect to the physical demands involved in women's soccer,» points out Castellano.
In a
study appearing in the journal PLOS ONE, researchers at The Ohio State University and their colleagues have demonstrated how two separate effects
of climate change combine to destabilize
different populations of coral microbes — that is, unbalance the natural coral «microbiome» — opening the door for bad bacteria to overpopulate corals» mucus and their bodies as a whole.
This
study compared 126
different measures
of working poverty using 2013
population data.
Their recent
study, which appears as the cover article in the May issue
of Cancer Research, shows that mathematical models can be used to predict how
different tumor cell
populations interact with each other and respond to a changing environment.
Malin Pinsky, an ecologist at Rutgers University who
studies population dynamics
of coastal marine species and who was not involved in the research, described the
study as significant because
of its unusually large scope, as well as its focus on
different fish life stages.
Now a team
of researchers has confirmed this by
studying female diet and male ornament variation in
different populations of the fish.
«Killer whales have been thought
of by some as something like the poster child» for the process, «because there are multiple genetically distinct
populations [which have not yet been formally described as separate species] with
different prey preferences in the North Pacific and Antarctic,» says Phillip Morin, a cetacean biologist at the Southwest Fisheries Science Center in San Diego, California, who was not involved in the new
study.
Michaela Hau, an evolutionary physiologist at the Max Planck Institute for Ornithology in Germany, says that the new
study is «immensely valuable» because it was carried out with a large number
of baboons who lived in the wild rather than a captive
population, which might be suffering from
different kinds
of stresses due to captivity, social isolation, or variable food quality.
In its
study, the team
of scientists explains that species with low habitat requirements depend on the exchange between
different populations.
«The strengths
of our
study are that we have confirmed these results in a completely
different animal group, and that our data comes from wild
populations,» she concludes.
«This
study addresses one
of the most relevant issues in healthcare and research on aging
populations: how to diagnose and assess frailty, given the availability
of many
different frailty scores and the lack
of a gold standard», says Dr Aguayo.
This provides new opportunities related to the
study of how the heterogeneities that appear at lower levels
of the functional hierarchy, for example at the level
of bacterial
populations, eventually end up in the same chemical pattern that is specific to
different diseases.
The
study's strengths, the authors wrote, include «the large sample size for both early and late postmenopausal women, the examination
of multiple sex hormones in the same
population, and the use
of a comprehensive neuropsychological battery that allowed for the assessment
of different cognitive domains.»
No
studies, however, had looked closely at what happened to
population growth locally in
different regions
of Europe after the first farmers arrived.
Two other
studies, both appearing in this month's issue
of The American Journal
of Human Genetics, examined blue eyes in
different populations and found the same mutation.
The
study, reported online 3 February in Nature Genetics, is the latest in a series
of recent reports to identify genes that are still evolving or have evolved recently in
different human
populations (ScienceNOW, 10 December 2007).
However, «past
studies performed with viruses containing higher
populations of 7U viruses using other MAbs did not protect [non-human primates] against Ebola - Zaire, whereas
studies using
different antibodies containing high
populations of 8U did.
Researchers leading the largest genomic tumor profiling effort
of its kind say such
studies are technically feasible in a broad
population of adult and pediatric patients with many
different types
of cancer, and that some patients can benefit by receiving precision drugs targeted to their tumors» mutations or being enrolled in clinical trials.
As with other genetic
studies linking diseases to DNA markers, her research tends to compare
populations who have one variation
of a genetic marker with those who have a
different variation — a comparison that has limited application to individuals.
But he says Nance needs to repeat the
study in other ethnic
populations, because the frequency
of Cx 26 mutations may have been
different in Mongolians to begin with.
With crowdfunded projects such as American Gut, which already has thousands
of participants who have had their microbiomes sequenced, and
studies of people whose lives are very
different from modern Western civilization, such as the Hadza
of Tanzania, Yanomami
of Venezuela and Matsés
of Peru, we may be able to replenish our ancestral microbes and discover new ones that help to maintain health for individuals or entire
populations.
Led by Thomas Cucchi
of National Center for Scientific Research in Paris, France, and Lior Weissbrod
of the University
of Haifa in Israel, the
study set out to explain large swings in the ratio
of house mice to wild mice
populations found during excavations
of different prehistoric periods at an ancient Natufian hunter - gatherer site in the Jordan Valley
of Israel.