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Antarctic Research nsf10543The polar regions have been called Earth's window to outer space. This term originally applied to study of the aurora and other ... The Antarctic support contractor will provide prospective travelers to the Antarctic with the U.S. Antarctic Program medical ... Antarctic Bibliography. The NSF-funded Antarctic Bibliography is the world's most complete bibliography of Antarctic scientific ... The Antarctic Artists and Writers Program, which is managed by the Division of Antarctic Sciences, enables serious writings and ...
Items where NERC Author is "Hughes, Kevin" - NERC Open Research Archive2015 [Editorial] A new paradigm - Antarctic influence without Antarctic presence? Antarctic Science, 27 (1). 1. 10.1017/ ... 2009 Review of Bioremediation of petroleum hydrocarbons in cold regions, edited by D.M. Filler, I. Snape and D.L. Barnes. ... 2008 Review of Antarctic bioprospecting edited by A.D. Hemmings and M. Rogan-Finnemore. Antarctic Science, 20 (6). 607-608. ... 2004 Long-term survival of human faecal microorganisms on the Antarctic Peninsula. Antarctic Science, 16 (3). 293-297. 10.1017/ ...
Paradigm misplaced? Antarctic marine ecosystems are affected by climate change as well as biological processes and harvesting |...Antarctic marine ecosystems are affected by climate change as well as biological processes and harvesting - Volume 19 Issue 3 ... Integrated ecosystem studies of Western Antarctic Peninsula continental shelf waters and related Southern Ocean regions. Deep- ... Scales of interaction between Antarctic krill and the environment. In D. Sahrhage , ed. Antarctic Ocean and resources ... M.A.J. Curran , T.D. Van Ommen , V.I. Morgan , K.L. Phillips & A.S. Palmer 2003 Ice core evidence for Antarctic sea ice decline ...
Antarctic Research (nsf13527)... and geographic regions that are underrepresented in STEM disciplines, which is essential to the health and vitality of science ... Antarctic Research. Antarctic Astrophysics & Geospace Sciences (AAGS), Antarctic Earth Sciences (AES), Antarctic Glaciology (AG ... Antarctic Earth Science, $8M; Antarctic Glaciology, $6M; Antarctic Instrumentation and Technology Development, $12M; Antarctic ... Antarctic Bibliography. Investigators funded through Antarctic Sciences are requested to send the Antarctic Bibliography one ...
Pew Urges International Leaders to Recommit to Protecting Southern Ocean Food ChainAntarctic krill are by far the most important food in the diet of many marine mammals and seabirds, from the blue whale to the ... polar scientists and non-governmental organizations to redouble their efforts to protect polar regions from the impact of ... destroying key habitat and nursery areas for Antarctic krill. Less sea ice means less Antarctic krill. ... especially as they relate to Antarctic krill, the keystone species of the Antarctic food chain." ...
Glacier, Argentine Research Station, Paradise Bay, Antarctic Peninsula, Antarctica, Polar Regions Photographic Print by...Polar Regions Photographic Print by Thorsten Milse - at AllPosters.com. Choose from over 500,000 Posters & Art Prints. Value ... Glacier, Argentine Research Station, Paradise Bay, Antarctic Peninsula, Antarctica, Polar Regions. By: Thorsten Milse Item #: ... www.allposters.com/-sp/Glacier-Argentine-Research-Station-Paradise-Bay-Antarctic-Peninsula-Antarctica-Polar-Regions-Posters_ ... print/posters/thorsten-milse-glacier-argentine-research-station-paradise-bay-antarctic-peninsula-antarctica-polar-regions_a-G- ...
Frontiers | Microbial Community Responses to Increased Water and Organic Matter in the Arid Soils of the McMurdo Dry Valleys,...2006). Emission of CO2, CH4 and N2O from lakeshore soils in an Antarctic dry valley. Soil Biol. Biochem. 38, 3120-3129. ... Keywords: metatranscriptomics, microbial ecology, Antarctica, soils in hyper-arid regions, amendments. Citation: Buelow HN, ... Only two endemic Diptera species have been reported on the Antarctic continent (Convey and Block, 1996), both from the midge ... Arctic Antarctic Alpine Res. 37, 108-117. doi: 10.1657/1523-0430(2005)037[0108:PSOMTI]2.0.CO;2 ...
Antarctic regions | geographic area | Britannica.comAntarctic regions:
Catalog Record: Expedition to the Antarctic regions. Hearings... | Hathi Trust Digital LibraryExpedition to the Antarctic regions. Hearings before the subcommittee of the Committee on Appropriations, House of ... Catalog Record: Expedition to the Antarctic regions. Hearings before the subcommittee of the Committee on Appropriations, House ... regions , Hathi Trust Digital Library. Navigation. *Home ...
Bonhams : BORCHGREVINK (CARSTEN E.)] Report on the Collection of Natural History Made in the Antarctic Regions during the...Report on the Collection of Natural History Made in the Antarctic Regions during the Voyage of the "Southern Cross", first ... Report on the Collection of Natural History Made in the Antarctic Regions during the Voyage of the "Southern Cross" ... Wilson on antarctic seals. Appearing for the first time in print are extensive extracts from the diary of the zoologist Nicolai ...
Bonhams : BULL (HENRIK J.) The Cruise of the Antarctic to the South Polar Regions, FIRST EDITION, Edward Arnold, 1896The Cruise of the Antarctic to the South Polar Regions, FIRST EDITION, presentation inscription from the author's cousin J.C. ... The Cruise of the Antarctic to the South Polar Regions, FIRST EDITION ...
Detail view of Movies PageIn 1946, the U.S. Navy launches "Operation Highjump" to explore and map the Antarctic region and, in the process, test men, ... The teams must finish their work before the end of the brief Antarctic summer. In addition to scientific equipment and other ... seals and other Antarctic wildlife. When the central group reaches Little America, the explorers unload their equipment and, ... Antarctic regions Expeditions Ships United States. Army United States. Coast Guard United States. Navy ...
Integrative modelling of animal movement: incorporating in situ habitat and behavioural information for a migratory marine...Antarctic Regions. Bayes Theorem. Cold Temperature. Computer Simulation. Diving. Ecology / methods*. Ecosystem. Male. Models, ...
fern | plant | Britannica.comArctic and Antarctic regions possess few species. On the other hand, a small tropical country such as Costa Rica may have more ... rapidly invading abandoned fields and pastures in both temperate and tropical regions. One species of water spangles (Salvinia ... some other species are involved in the case of ferns with remote disjunctions-separated growing regions. There are interisland ...
CANS 407 - The Canadian North: Past and Present | McGill Library - McGill UniversityAAR (Arctic and Antarctic Regions) 1800s to the present. *ASTIS (Arctic Institute of North America) 1978 to the present ...
Gamma-ray observations of SN 1987A from AntarcticaGamma Ray Astronomy, Supernova 1987a, Antarctic Regions, Astronomical Spectroscopy, Spectral Emission. DOI:. 10.1086/185487. ...
HeteroloboseaDe Jonckheere J. F. Isolation and molecular identification of vahlkampfiid amoebae from Arctic and sub-Antarctic regions. Europ ...
Antarctic photo H188 | ArkiveAerial view of Antarctic mountains with cracks in the snow - View amazing Antarctic photos on Arkive ... Owing to this partnership, lichens can thrive in harsh environments such as mountaintops and polar regions. Characteristically ... The Antarctic and sub-Antarctic waters also support vast numbers of seabirds, with the Antarctic and sub-Antarctic islands ... Some parts of the Antarctic receive extra protection in the form of Antarctic Specially Protected Areas (ASPAs), Antarctic ...
Arctic and Antarctic Stock Photography focusing on the indigenous people of the polar regions - ArcticPhoto... wall art and other gifts featuring Arctic or Antarctic scenes, people or phenomena ... Here you can find stock photography of the polar regions and the native peoples that inhabit them such as the Evenki, Innu, ...
Gough Island 500 years after its discovery: a bibliography of scientific and popular literature 1505 to 2005Bernstein R.E. (1984). Dr Harvey Pirie: versatile man of science and pioneer explorer of sub-Antarctic regions eighty years ago ... African Antarctic and sub-Antarctic stations for 1991; Climatological data for South African Antarctic and sub-Antarctic ... Holdgersen H. (1945). Antarctic and sub-Antarctic birds. In: Scientific Results of the Norwegian Antarctic Expeditions, 1927 ... Woehler E.J. (1993). The distribution and abundance of Antarctic and sub-Antarctic penguins. Scientific Committee on Antarctic ...
Alphabetical Browse | Britannica.com... of the four geomagnetic and meteorologic stations scheduled for Antarctic regions, only the...... ... and other regions. The war pitted the Central Powers-mainly Germany, Austria-Hungary, and Turkey-against the Al... ...
Antarctic region - Biodiversity Heritage LibrarySubjects: Antarctic region Arctic races Arctic region Arctic regions Regions arctiq Zoology ... The polar world a popular description of man and nature in the Arctic and Antarctic regions of the globe / By: Hartwig, G. ( ...
Highlight on AlumniShe developed a code in Python for an algorithm that measures the thickness of ice in the Arctic and Antarctic regions. Lucia ...
Ross Sea | sea, Pacific Ocean | Britannica.comFlora and fauna are typical of other southerly Antarctic marine regions. The nutrient-rich seawater supports abundant ... All coastal regions have been geologically explored, at least in reconnaissance, and the southern Victoria Land region near ... Body of salt water extending from the Antarctic region in the south to the Arctic in the north and lying between the continents ... British naval officer who carried out important magnetic surveys in the Arctic and Antarctic and discovered the Ross Sea and ...
ADS Bibliographic Codes: Refereed PublicationsAntarctic Meteorite Research AntSc Antarctic Science Anten Antenny Apei Apeiron APLM APL Materials APLP APL Photonics ApMat ... H II regions and related topics 1985LNP 231 Hadrons and Heavy Ions 1999LNP 516 Hadrons in Dense Matter and Hadrosynthesis ... Antarctic and Alpine Research ArA Arkiv for Astronomi ArG Arkiv for Geofysik ArM Arkiv for Matematik ArMAF Arkiv for Matematik ...
No data available that match "Antarctic Regions"
(1/765) Bulbus arteriosus of the antarctic teleosts. I. The white-blooded Chionodraco hamatus.
The bulbus arteriosus of teleost fish is a thick-walled chamber that extends between the single ventricle and the ventral aorta. The functional importance of the bulbus resides in the fact that it maintains a steady blood flow into the gill system through heart contraction. Despite of this, a thorough study of the structure of the bulbus in teleost fish is still lacking. We have undertaken a morphologic study of the bulbus arteriosus in the stenothermal teleosts of the Antarctic sea. The structural organization of the bulbus arteriosus of the icefish Chionodraco hamatus has been studied here by conventional light, scanning, and transmission electron microscopy. The inner surface of the bulbus shows a festooned appearance due to the presence of longitudinal, unbranched ridges that extend between the ventricle and the arterial trunk. The wall of the bulbus is divided into endocardial, subendocardial, middle, and external layers. Endocardial cells show a large number of moderately-dense bodies. The endocardium invaginates into the subendocardium forming solid epithelial cords that contain numerous secretory vacuoles. Cells in the subendocardium group into small domains, have some of the morphological characteristics of smooth muscle cells, and appear enmeshed in a three-dimensional network of matrix filaments. Cells in the middle layer are typical smooth muscle cells. They appear arranged into layers and are surrounded by a filamentous meshwork that excludes collagen fibers. Orientation of this meshwork occurs in the vicinity of the smooth muscle cells. Elastin fibers are never observed. The external layer is formed by wavy collagen bundles and fibroblast-like cells. This layer lacks blood vessels and nerve fibers. The endocardium and the endocardium-derived cords are secretory epithelia that may be involved in the formation ofmucins or glycosaminoglycans. These mucins may have a protecting effect on the endocardium. The subendocardium and the middle layer appear to be formed by the same cell type, smooth muscle, with a gradient of differentiation from the secretory (subendocardium) to the contractile (middle layer) phenotype. Despite the absence of elastin fibers, the filamentous matrix could maintain the elastic properties of the bulbus wall. Smooth muscle cells appear to be actively involved in bulbus wall dynamics. The restriction of collagen to the external layer suggests that it may control wall dilatation and bulbus compliance. When comparison was possible, structural differences between C. hamatus and temperate teleosts seemed to be not species-related, but of phenotypic adaptative significance. This is remarkable since Antarctic fishes have lived isolated in freezing waters for the last two million years. (+info)
(2/765) Prolonged eradication of urogenital mycoplasmas after administration of tetracycline to men in the Antarctic.
Meatal swabs were obtained at intervals over 1 year from 23 men in the Antarctic. A 5-day course of tetracycline was given to twelve of them. In retrospect it was found that the antibiotic had been received by two men who were harbouring ureaplasmas, one of whom also had M. hominis. After treatment, these organisms were not found in any of the swabs taken over the next year, except in a swab from one of the men following sexual contact after this time. One of the twelve men developed N.S.U. just before arriving in the Antarctic. He responded clinically to a shorter course of tetracycline and ureplasmas were not recovered from a meatal swab immediately thereafter. However, without further sexual contact, ureaplasmas and disease recurred about a month later. This time, after a 5-day course of tetracycline, disease was not seen, and ureaplasmas were not isolated, over the next year. In contrast, ureaplasmas were isolated consistently over a year from two men who were not given the antibiotic. The evidence strongly suggests that, under natural conditions, the most likely cause of mycoplasmas, particularly ureaplasmas, recurring in the genital tract after apparently adequate tetracycline therapy, is re-infection as a result of sexual re-exposure. (+info)
(3/765) A RNA polymerase with transcriptional activity at 0 degrees C from the Antarctic bacterium Pseudomonas syringae.
A DNA-dependent RNA polymerase was purified from the Antarctic psychrotrophic bacterium Pseudomonas syringae. The RNA polymerase showed a typical eubacterial subunit composition with beta, beta', alpha2 and sigma subunits. The subunits cross-reacted with antibodies raised against holoenzyme and the individual subunits of the RNA polymerase of Escherichia coli. However, the enzyme was considered unique, since unlike the RNA polymerase of mesophilic E. coli it exhibited significant and consistent transcriptional activity (10-15%) even at 0 degrees C. But, similar to the enzyme from the mesophilic bacterium, the RNA polymerase from P. syringae exhibited optimum activity at 37 degrees C. The study also demonstrates that the RNA polymerase of P. syringae could preferentially transcribe the cold-inducible gene cspA of E. coli only at lower temperatures (0-22 degrees C). The polymerase was also observed to be relatively more rifampicin-resistant during transcription at lower temperature. (+info)
(4/765) Metallothioneins in antarctic fish: evidence for independent duplication and gene conversion.
In the present paper, we examine eight species of Antarctic fish belonging to the suborder Notothenioidei, using reverse-transcriptase polymerase chain reaction, to investigate the presence of mRNAs encoding metallothionein (MT) isoforms. A total of 168 bp from the coding region and the complete (133-165 bp) 3' untranslated region (UTR) was obtained for all species (for three of them, we also sequenced the full-length cDNA, including the 5' UTR). Phylogenetic analyses carried out on the MT-coding region suggest monophyly for Antarctic fish MTs with respect to other teleost MT genes. Analyses also revealed that notothenioid MTs can be divided into at least two groups of paralogy, MT-1 and MT-2. These results indicate that notothenioid MT isoforms arose from at least one gene duplication event occurring in the ancestral lineage of the Notothenioidei. This duplication occurred independent of the one which gave origin to two metallothionein isoforms in the rainbow trout. In addition, an instance of gene conversion was observed between MT-1 and MT-2 genes in Notothenia coriiceps. Analyses of the 5' UTR, combined with quantitative assay of differential expression of MT-1 and MT-2, indicate that only the 3' UTR underwent a gene conversion event in the mentioned species. These findings, together with the observation of a differential pattern of expression for the two MT isoforms, disclose an unexpected complexity in the evolution and function of notothenioid MTs; as in most teleost species examined (apart from the rainbow trout), a single MT form is present. (+info)
(5/765) Determination of the solution structure of the N-domain plus linker of Antarctic eel pout antifreeze protein RD3.
RD3, a new antifreeze protein (AFP) extracted from antarctic eel pout is a single polypeptide divided into homologous N-terminal (residues Asn(1)-Glu(64)) and C-terminal (residues Ser(74)-Glu(134)) domains, each of which has a high sequence identity with Type III AFP. A 9-residue linker (-D(65)GTTSPGLK(73)-) connects these two domains in tandem and is thought to play a significant role in defining the nature of the intact molecule. The present paper shows for the first time the solution structure and preliminary (15)N-NMR backbone dynamics data of the N-domain plus the linker of recombinant RD3 protein (RD3-Nl: residues 1-73) by employing homo- and heteronuclear multidimensional NMR spectroscopy. Forty converged structures of RD3-Nl were successfully calculated by using a total of 958 NMR-derived structural restraints. It was found that the N-domain of RD3-Nl has a globular form comprising six beta-strands, three type III turns, and several loops, which stabilize a flat, ice-binding site formed on one side of this domain. Further, the linker portion appears to have a definitive structure, which is independent of the globular N-domain. This definitive linker is roughly divided into two short strands, -D(65)GTTSP(70)- and -G(71)LK(73)-, which are bent around -T(67)TSPG(71)- at an angle of approximately 60 degrees. This bending motif of the linker may function to orient the two ice-binding sites of the N- and C-domains of RD3 in the same direction, leading to their simultaneous interactions with the ice crystal surface. (+info)
(6/765) Physicochemical parameters for growth of the sea ice bacteria Glaciecola punicea ACAM 611(T) and Gelidibacter sp. strain IC158.
The water activity and pH ranges for growth of Glaciecola punicea (a psychrophile) were extended when this organism was grown at suboptimal rather than optimal temperatures. No such extension was observed for Gelidibacter sp. strain IC158 (a psychrotolerant bacterium) at analogous temperatures. Salinity and pH may be primary physicochemical parameters controlling bacterial community development in sea ice. (+info)
(7/765) Temperature-dependent expression of cytochrome-c oxidase in Antarctic and temperate fish.
Seasonal acclimation versus permanent adaptation to low temperatures leads to a differential response in the expression of cytochrome-c oxidase (CCO) in temperate and Antarctic eelpouts. Although eurythermal eelpout from the North Sea (Zoarces viviparus) displayed a cold-induced rise of CCO activity in white muscle, enzyme activity in the cold stenothermal Antarctic eelpout Pachycara brachycephalum failed to reflect such a compensatory increase. In Antarctic eelpout, CCO activity correlates with transcript levels of mitochondrial encoded subunits of CCO (CCO I and CCO II), whereas cold-acclimated eelpout from the North Sea show lower enzyme activities than expected on the basis of mitochondrial mRNA levels. In these animals, CCO expression at low temperatures may be limited either by nuclear CCO transcripts or by posttranscriptional processes. These may comprise translation of the subunits or assembly of the CCO holoenzyme. mRNA levels of CCO IV, one of the nuclear encoded subunits, increased strongly during cold acclimation, indicating that the expression of CCO is likely not message limited in cold-acclimated Z. viviparus. Our data suggest that seasonal cold acclimation of Z. viviparus results in a modification of the relationship between transcription and translation or posttranslational processes. In permanently cold-adapted P. brachycephalum, on the other hand, CCO expression shows similar characteristics as in the warm-acclimated confamilial species, e.g., low levels of enzyme activity correlated with low levels of mitochondrial message. (+info)
(8/765) Cold-adapted alanine dehydrogenases from two antarctic bacterial strains: gene cloning, protein characterization, and comparison with mesophilic and thermophilic counterparts.
The genes encoding NAD(+)-dependent alanine dehydrogenases (AlaDHs) (EC 184.108.40.206) from the Antarctic bacterial organisms Shewanella sp. strain Ac10 (SheAlaDH) and Carnobacterium sp. strain St2 (CarAlaDH) were cloned and expressed in Escherichia coli. Of all of the AlaDHs that have been sequenced, SheAlaDH exhibited the highest level of sequence similarity to the AlaDH from the gram-negative bacterium Vibrio proteolyticus (VprAlaDH). CarAlaDH was most similar to AlaDHs from mesophilic and thermophilic Bacillus strains. SheAlaDH and CarAlaDH had features typical of cold-adapted enzymes; both the optimal temperature for catalytic activity and the temperature limit for retaining thermostability were lower than the values obtained for the mesophilic counterparts. The k(cat)/K(m) value for the SheAlaDH reaction was about three times higher than the k(cat)/K(m) value for VprAlaDH, but it was much lower than the k(cat)/K(m) value for the AlaDH from Bacillus subtilis. Homology-based structural models of various AlaDHs, including the two psychotropic AlaDHs, were constructed. The thermal instability of SheAlaDH and CarAlaDH may result from relatively low numbers of salt bridges in these proteins. (+info)
- The U.S. Antarctic Program provides support for field work only when a compelling justification exists for doing the work in Antarctica (i.e., the work can only be done, or is best done, in Antarctica). (nsf.gov)
- Scientific research, along with operational support of that research, is the principal activity of the U.S. Antarctic Program in Antarctica. (nsf.gov)
- Antarctic fieldwork will only be supported for research that can only be performed or is best performed in Antarctica. (nsf.gov)
- The Antarctic Treaty Consultative Meeting (ATCM) is the major annual diplomatic event related to Antarctica. (pewtrusts.org)
- Scientists warn of the potential for localized depletion of Antarctic krill at levels which could seriously harm both the land and ocean-based Antarctic krill predators that call Antarctica home. (pewtrusts.org)
Organisms and Ecosystems
- and Antarctic Organisms and Ecosystems, $8M. (nsf.gov)
- The level of collaboration and communication between the Arctic Council and the Antarctic Treaty Parties must increase if we are going to address the impacts of climate change and ensure protection for these highly fragile environments and the ecosystems they support," said Leape. (pewtrusts.org)
- Spatially integrated assessment reveals widespread changes in penguin populations on the Antarctic Peninsula. (cambridge.org)
- On the eve of a historic 11-day meeting celebrating the 50th anniversary of the Antarctic Treaty, the Pew Environment Group encouraged diplomats, polar scientists and non-governmental organizations to redouble their efforts to protect polar regions from the impact of climate change. (pewtrusts.org)
- The Antarctic Treaty governs environmental stewardship of the land and waters of the Southern Ocean, which are under increasing stress due to global warming," said Gerald Leape, who directs the Pew Environment Group's Antarctic Krill Conservation Project. (pewtrusts.org)
- The signatories to the Treaty must rise to the occasion and fully reengage on the critical issues impacting the region -- especially as they relate to Antarctic krill, the keystone species of the Antarctic food chain. (pewtrusts.org)
- The first-ever joint Arctic Council/Antarctic Treaty Ministerial Meeting begins today at the U.S. State Department in Washington, DC. (pewtrusts.org)
- The Antarctic Treaty Consultative Meeting runs from April 7-17 at the Baltimore Convention Center in Baltimore, Maryland. (pewtrusts.org)
- In response to recommendations by the recent Antarctic Science Committee of Visitors regarding the need to assess field support requirements in an accurate and timely way, and with the goal of streamlining decisions for award or decline, changes have been made to the way that field support information is gathered and the way that some items are budgeted. (nsf.gov)
- Immediately preceding the official start of the ATCM, the Antarctic Treaty's Committee on Environmental Protection and the Science Committee of the Commission for the Conservation of Antarctic Marine Living Resources met for the first time, on April 3 and 4. (pewtrusts.org)
- The two groups discussed ways to achieve closer coordination and collaboration in their efforts to address the serious impact of climate change on marine resources in the Southern Ocean, including Antarctic krill and Patagonian toothfish (widely known as Chilean sea bass), and promote progress on marine protected areas. (pewtrusts.org)
- Decrease in stomach contents in the Antarctic minke whale (Balaenoptera bonaerensis) in the Southern Ocean. (cambridge.org)
- Antarctic krill are by far the most important food in the diet of many marine mammals and seabirds, from the blue whale to the albatross. (pewtrusts.org)
- The program also supports Antarctic-related analytical research performed at home organizations. (nsf.gov)
- The National Science Foundation's Antarctic Sciences Section fosters research on globally and regionally important scientific problems. (nsf.gov)
- In particular, the Antarctic Sciences Section supports research that expands fundamental knowledge of the region as well as research that relies on the unique characteristics of the Antarctic continent as a platform from which to support research. (nsf.gov)
- The Antarctic Sciences Section strongly encourages research using existing samples, models, and data as well as research at the intersection between disciplines. (nsf.gov)