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Extinction in Medical News

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. extinction 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 learning. 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 ...

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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

SpectraMax 190

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

Insidious

... 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

... 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 event. 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 ...

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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. Ocean Currents 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 molar extinction 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 ,2, ...

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 ...

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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 ...
Company:Invitrogen
Extinction in Biological Definition

Biodiversity

... 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 . ...

Evolution

... 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 . extinction is the disappearance of species (i.e. gene ...

Extinction

... 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 ...

Human

... 8.1 Psyche 8.2 Self-reflection 9 Human extinction 10 See also 11 References 12 ... more than one of zoology . Human extinction Human extinction refers to the possibility that the human species ...

Metapopulation

... 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 ...

Natural selection

... 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 ...

Adaptive radiation

... 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 ...

Botany

... changes 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 ...

Cold-blooded

... 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 ...

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Extinction in Biological Dictionary

Extinction

... 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 ...

Mesozoic Era

... 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. ... ...

Metapopulation

... 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 ...

Hybridization

... 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 ...

Genetic assimilation

... 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 effect

... 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 ...

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(Date:7/24/2014)... in humans, affect the connections between nerve cells and ... an area of the brain that plays a significant ... The results of the study have been published in ... on the active communication between nerve cells, known as ... a dense network where they constantly relay signals to ...
(Date:7/24/2014)... Forest is a hotspot of biodiversity and one of ... and toads) in the world. However, current levels of ... years has been an increase in the description of ... advance of molecular techniques and availability of samples for ... of samples for molecular and morphological analysis, researchers from ...
(Date:7/24/2014)... 2014) For years, researchers and patients have hoped ... cell type in the bodycould provide insight into numerous ... progress has been hampered by the inability to transfer ... human counterparts, in part because human ESCs are "primed" ... Now Thorold Theunissen, Benjamin Powell, and Haoyi Wang, who ...
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