Rutgers research identifies brain cells related to fear
... studies have demonstrated, however, that extinction
training does not completely abolish the initial ... presented in a context other than the one where extinction
training took place.
For example, suppose a rat is trained for extinction
in a grey box smelling of roses, and later hears ...
MIT's McGovern Institute honors Emory neuroscientist for contributions to psychiatry
... such as fearful memories eventually disappear. extinction
is not merely the gradual decay of memory. Instead, Davis has shown that extinction
involves an active process that, like the ... Understanding the balance between acquisition and extinction
of fearful memories is of great importance for ...
Very young found to process fear memories in unique way
... concluded that the age at which the initial extinction
training occurred was critical to whether or not ... could still exist and be called on again.
in the young brain might forever erase early ... brain develops is where and how fear learning and extinction
are stored and how they can be retrieved.
Corals added to IUCN Red List of Threatened Species for first time
... that marine species are not as vulnerable to extinction
as land-based species, said Roger McManus, CIs ... are likely to be listed as threatened with extinction
when more detailed information becomes available. ... 20,000 marine species to determine their risk of extinction
according to the IUCN Red List Categories and ...
Treating addiction by eliminating drug-associated memories
... environment during subsequent tests."
This is a process called extinction
learning, whereby the compound helps the brain to create new associations ... mGluR5 agonists [like CDPPD] might play a role in the treatment of the extinction
of other forms of maladaptive learning, such as the traumatic memories ...
Ecstasy could help patients with post-traumatic stress disorder
... the appropriate response to the trigger situation, a process known as extinction
But this approach can take some time, and 40% of patients ... for PTSD relies. But, caution the authors, while these compounds enhance extinction
learning they may also temporarily increase anxiety in people with PTSD ...
Cocaine addiction linked to voluntary drug use and cellular memory, UCSF study shows
... of rats in the active group also underwent behavioral extinction. In extinction
training, depression of the lever was no longer accompanied by cocaine ... behavior, LTP remained just as high as in rats that had not received the extinction
training, indicating that the cellular memory produced by cocaine-seeking ...
Cancer Endangers Some Wildlife Species
... , noted that cancer threatens the survival of some species, including the Tasmanian devil. The world's largest marsupial carnivore is at risk of extinction
due to a contagious cancer called Tasmanian devil facial tumor disease. In an effort to save the species, cancer-free Tasmanian devils are being ...
Wildlife faces cancer threat
... In certain situations, cancer threatens the survival of entire species. The Tasmanian devil, the world's largest carnivorous marsupial, is at risk of extinction
due to a cancer known as devil facial tumor disease. This form of contagious cancer spreads between individual Tasmanian devils through direct ...
Inbreeding May Have Doomed Spain's Habsburg Dynasty
... to oblivion via infertility, scientists report in a research paper released last month.
"Inbreeding was a major cause responsible for the extinction
of this dynasty" and also contributed to the deaths of many Habsburg children, said study co-author Francisco C. Ceballos, a researcher at the ...
Extinction in Medical Technology
New Study Shows Cloning from Dried Cells Now Possible
... not always available in developing countries.
Dr. Loi also noted that the new technology also could assist with
conserving animals threatened with extinction
by allowing for easy and
inexpensive transportation and storage of cells of endangered species.
"This could be invaluable, given we have no way of ...
Extinction in Medical Products
SpectraMax M2 multi-detection microplate reader w/ dual-mode cuvette port
Description:... pathlength of 1 cm similar to using 96 or 384 cuvettes simultaneously. PathCheck allows you to eliminate standard curves. For compounds with a known extinction
coefficient, concentration can be calculated directly from ....
Company:Molecular Devices Corporation
Features:... Use the extinction
coefficient of your sample to calculate concentrations directly
Correct for volume differences in the wells
Expand the dynamic range of your ...
Company:Molecular Devices Corporation
Extinction in Medical Dictionary
... changes involving apathy and irritability to manic depressive or schizophreniform illness. The bald eagle is making a comeback following near extinction
from the insidious effects of DDT on the environment. AIDS is the deadly disease caused by HIV ---an insidious virus that attacks the ...
... STD and ecological niches Information: The bald eagle is making a comeback following near extinction
from the insidious effects of DDT on the environment. STD quiz: Are you taking proper preventive steps? Doctors have identified more than 20 ...
Extinction in Biological News
New book suggests Earth perhaps not such a benevolent mother after all
... at conditions that existed during numerous mass extinction
events in Earth's history.
In a new book, he ... to manage their environment or face potential extinction
if the Earth is left to manage itself.
"The ... The evolution of the first true animals caused extinction
of most stromatolites, layers of microbes living ...
Princeton geoscientist offers new evidence that meteorite did not wipe out dinosaurs
... Earth just at the boundary and caused the mass extinction
of dinosaurs and many other animals. They thought ... suggest that the impact crater and the mass extinction
event only appear far apart in the sedimentary ... from the sandstone complex and the overlying mass extinction
were formed by normal processes. There is ...
Evidence of the 'Lost World' -- did dinosaurs survive the end Cretaceous extinctions?
... of dinosaurs that survived the catastrophic extinction
event 65 million years ago, has no less appeal ... really did live after the end Cretaceous extinction
The first step must be to demonstrate ... rocks containing the bones are younger than the extinction
event. Fassett has analysed the magnetic polarity ...
April 2009 Geology and GSA Today media highlights
... cycle associated with the Late Ordovician mass extinction
in South China
Tonggang Zhang et al., CRC in ... Pages 299-302.
The Late Ordovician mass extinction
took place in the Hirnantian Stage (445.6-443.7 ... years ago) and is the second largest of all great extinction
events over the past 543 million years. During ...
Study unravels why certain fishes went extinct 65 million years ago
... spelled doom for bony fishes during the last mass extinction
65 million years ago, according to a new study to ... that are currently in decline and at risk of extinction
themselves, said Matt Friedman, author of the ... chains at a rudimentary level, and led to the extinction
of thousands of species of flora and fauna, ...
The law of the weakest
... The extinction
of species is a consequence of their inability to ... lead to fluctuations that ultimately lead to the extinction
of species. We know that up to 50 species become ... the influence of man.
Yet, the phenomenon of extinction
of species itself cannot be avoided altogether ...
Current mass extinction spurs major study of which plants to save
... The Earth is in the midst of the sixth mass extinction
of both plants and animals, with nearly 50 ... National Academy of Sciences .
"The current extinction
event is due to human activity, paving the ... conservation."
He explained that the last mass extinction
near the current level was 65 million years ago, ...
Extinction by asteroid a rarity
... published studies suggesting that the end-Permian extinction
250 million years ago happened in essence because ... group suggests a similar slow dying during the extinction
200 million years ago at the boundary of the ... two specific times that are associated with mass extinction
suggests at the very least that maybe there's ...
Mass extinctions and the evolution of dinosaurs
... years ago and survived the Late Triassic mass extinction
(228 million years ago), when some 35 per cent of ... It was their predecessors dying out during this extinction
that allowed herbivorous dinosaurs to expand into ... did not happen until after the much bigger mass extinction
some 200 million year ago, at the ...
October 2008 GEOLOGY and GSA TODAY media highlights
... the marine organisms that recovered from the extinction
were housed. Trace fossils, which preserve the ... they provide evidence for refuges from ongoing extinction
pressures in the immediate aftermath of latest ... storms. Within the habitable zone, latest Permian extinction
levels are reduced and the recovery time is ...
Extinction in Biological Technology
DNA duplication: A mechanism for 'survival of the fittest'
... 60% of the plant species and numerous animals, including the dinosaurs. Only the most well-adapted plants and animals were able to survive this mass extinction
- but what is 'most well-adapted'?
A role for DNA duplication?
Jeffrey Fawcett, Steven Maere and Yves Van de Peer (VIB-UGent) have been ...
'Museomics' yields new insights into extinct Tasmanian tiger
... died in the London Zoo in 1893. In addition to refining the place of this unusual animal in evolutionary history, genetic clues to the impending extinction
of the thylacine became apparent.
"What I find amazing is that the two specimens are so similar," said Dr. Anders Gtherstrm of Uppsala ...
The sea ice is getting thinner
... ecosystem. According to the newest models, the Arctic could be ice free in less than 50 years in case of further warming. This may cause the extinction
of many organisms that are adapted to this habitat.
The Arctic Ocean currents are an important part of global ocean circulation. ...
PathCheck Applied to Measurement of Protein Solutions in the SpectraMax Plus Microplate Spectrophotometer (MaxLine Application Note #26)
... the absorbance at 280 nm and calculating the concentration using the extinction
coefficient of the protein. The procedure is feasible because extinction
coefficients are typically obtained using standard cuvettes with a fixed 1 ...
Visions: Rimas Buinevicius, CEO of Sonic Foundry
... . And it's all being driven by technology that is changing the process of how we communicate. As a result, the centralized office is on the brink of extinction
with few reasons remaining for why we must be tethered to a fixed location.
Today's savvy working professional is an armed communications expert, ...
Near Infrared Technology and Optical Agents For Molecular Imaging
... several centimeters 3, 7, 8 .
A key to enabling optical imaging has been the development
of suitable NIR fluorochromes with high
coefficients, good quantum yields
and low non-specific tissue binding. There are several
commercially available candidate fluorochromes which can ...
XANTHOCHROMIA IN CEREBROSPINAL FLUID
... account and compensates for the interference of haemoglobin and bilirubin absorption bands.
Figure 1: Molar extinction
Coefficient of Haemoglobin (left) and Bilirubin (right) [cm-1/M vs nm]
The method consists in scanning the region 350-550nm and ...
Verifying Multichannel Pipettor Performance with Standard Dispense Solutions in the SpectraMax Plus (MaxLine Application Note #28)
... into a known volume of diluent and the absorbance measured. The actual dispensed volume is then calculated from the absorbance, the light path, the extinction
coefficient and the diluent volume. Various chromogens have been used, including Ponceau S dye, methyl red, Evans Blue dye and nicotinamide. 1
UV Absorbance Measurements in SpectraMax Microplate Spectrophotometers MaxLine Application Note #32)
... its concentration, and the optical pathlength (Figure 3). For a given solute under defined solution conditions, absorptivity (sometimes called extinction
Coefficient) is a constant. In traditional cuvettes, the pathlength is also a constant (typically 1 cm), so the only variable is concentration. In ...
Performance of fluorescent dyes with LEADseeker Multimodality Imaging System
... c = concentration
O.D. = absorption value determined
ε = extinction
coefficient of the relevant fluorescent dye
Following determination of concentration, each dye was diluted further in buffer to a ...
Extinction in Biological Products
Avidin, FITC conjugated/tagged from Invitrogen
Description:... Avidin is chromatographically purified from egg white. The extinction
coefficient , E(1%) at 280nm is 15.5.The product is in 10 mM phosphate-buffered saline, pH 7.4, containing 1% bovine serum albumin, 0.05% sodium ...
Extinction in Biological Definition
... has coincided with the expansion of concern over extinction
observed in the last decades of the 20th ... with one species after another suffering extinction
Estimates of global species diversity vary ... See also : biogeography , Amazonian forest , extinction
, Unified neutral theory of biodiversity .
... and macroevolution
1.5 Speciation and extinction
2 Evolutionary biology
3 History of ... can be said to have occurred.
Speciation and extinction
Speciation is the creation of two or more ... of the theory of punctuated equilibrium .
is the disappearance of species (i.e. gene ...
... In biology and ecology , extinction
is the ceasing of existence of a species or group of species. The moment of extinction
is generally considered to be the death of the last individual of that species. extinction
is a natural phenomenon; it is estimated that ...
... 8.1 Psyche
9 Human extinction
10 See also
12 ... more than one of zoology .
refers to the possibility that the human species ...
... habitat which has been left open by the extinction
of another population. They may also immigrate into another small population and so rescue it from extinction
(called the rescue effect ).
The development ... each occupied patch can become unoccupied with an extinction
probability e . Additionally, 1- N of the ...
... be more varied and therefore more resistant to extinction
due to environmental catastrophes and extinction
events . This has been proposed as one reason for ... how species change, and can account for both the extinction
of one species and the creation of a new one.
Competitive exclusion principle
... will always have an ever so slight advantage over the other that leads to extinction
of the second competitor in the long run.
The competitive exclusion ... trade-offs , and lag prevent exclusion (ignoring stochastic extinction
over longer time-frames). However, such systems tend to be analytically ...
... An example of adaptive radiation as the result of an environmental change is the rapid spread and development of mammalian species after the extinction
of the dinosaurs.
Archipelagoes . Isolated ecosystems , such as islands and mountain areas, can be colonized by a new species which upon ...
Plants can also help us understand changes in on our environment in many ways.
Understanding habitat destruction and species extinction
is dependent on an accurate and complete catalogue of plants provided systematics and taxonomy .
Plant responses to ultraviolet radiation can ...
... times the number of poikilothermic animals as homeothermic animals. However, in a given niche, homeotherms often drive poikilothermic competitors to extinction
because homeotherms can gather food for a greater fraction of each day.
Poikilotherms succeed in some niches, such as islands, or distinct ...
Extinction in Biological Dictionary
... In biology and ecology, extinction
is the end of a species or group of taxa. The moment of extinction
is generally considered to be the death of the ... a species' potential range may ... extinction
in psychology refers to the lowering of the ...
... of ... The Mesozoic era came to an end with the great terminal extinction
event known ... A really long time ago.(By the Numbers)(dinosaurs)( ... period, which opens the Mesozoic era , follows a near-complete extinction
of life. Recovery from the brink is predictably slow. ... ...
... at the library for BIOL 6301, Sect. ... We consider a discrete size-structured metapopulation mo ... tion and absence of emigration lead to extinction
of the metapopulation . ... The metapopulation is not the entire population, just the population within a set area. ... The metapopulation ...
... orbitals to form new ... Hybridization between the endemic Cuban Crocodile (Crocodilus rhombifer) and the ... JM and Simberloff, D. (1996) extinction
by Hybridization and Introgression. ... in situ hybridization protocols ... In situ hybridization , as the name suggests, is a method of ...
... Note: Genetic assimilation is sometimes used to describe "eventual extinction
of a natural species as massive pollen flow occurs from another related species and the older crop becomes more like the new crop." This ...
... Founder's Effect . From RationalWiki. Jump to: navigation, search ... a species affected by the Founder's Effect , having come close to extinction
... Zoology information, history, articles and research from Academic Journals, Newspapers, and magazines at HighBeam.com. Free Trial, Credit ...