Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 69
Primeira ... 1234 ... Última
Imagem não selecionada

Imprime registro no formato completo
A methodological proposal for the recovery of palynomorphs from snow and ice samples Acta Botanica
Rodrigues,Luiz Antonio da Costa; Agostini,Kamila da Matta; Alencar,Alexandre Santos de; Mendonça,Cláudia Barbieri Ferreira; Carvalho,Marcelo Araújo de; Gonçalves-Esteves,Vania.
ABSTRACT The procedures for a set of techniques to recover grains of pollen 26 and spores from liquid samples are described. Liquefied samples of matrices, such as melting lakes, snow and ice, can provide a record of climatic and environmental events at different geographic and temporal scales. The need for standardization of techniques was demonstrated in research carried out with matrices of snow and water of thawing lakes and snow collected on King George and Joinville islands (Antarctica). The use of the methods described can permit increased rescue of palynomorphs from liquid matrices, thereby adding greater reliability to palynological data and its use as a biotracer of environmental events. Methods of sieving and centrifugation were tested, and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; Ice; Spores; Snow; Technique to recover grains of pollen.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400667
Imagem não selecionada

Imprime registro no formato completo
A new deep-sea isopod from the Weddell Sea, Antarctica: Coperonus pinguis n. sp. (Crustacea, Isopoda, Munnopsidae) Naturalis
Brandt, Angelika.
A new species of Coperonus, C. pinguis, is described from the Antarctic deep sea. It is the first record of an Antarctic deep-sea species in this genus and the southernmost record of Coperonus.
Tipo: Article / Letter to the editor Palavras-chave: Taxonomy; Biogeography; Antarctica; Weddell Sea; Deep sea; Coperonus.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/503974
Imagem não selecionada

Imprime registro no formato completo
A new mini box corer for sampling muddy bottoms in antarctic shallow waters BABT
Echeverría,Carlos Alejandro; Lavrado,Helena Passeri; Campos,Lúcia; Paiva,Paulo Cesar de.
A new Mini Box Corer (MBC-GEAMB) was developed for bottom sampling in Antarctic shallow waters down to 100 m depth from a small vessel. It consists of a detachable stainless steel box with a total sampling area of 0.0625 m², and a closing arm with a detachable blade without an external frame. MBC allowed stratified bottom sampling and good quality samples comparable to those obtained through diving. A comparison between the MBC-GEAMB and a 0.056 m²van Veen grab (VV) was undertaken for the benthic macrofaunal composition in Admiralty Bay, King George Island (Antarctica). MBC and VV samples were taken from three depths (20, 30 and 60m) in two sites. Total densities sampled with the MBC were up to 10 times higher than those obtained with van Veen grab. VV...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mini box-corer; Antarctica; Benthos; Sampling.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300015
Imagem não selecionada

Imprime registro no formato completo
Antarctic icebergs: A significant natural ocean sound source in the Southern Hemisphere ArchiMer
Matsumoto, Haru; Bohnenstiehl, Delwayne R.; Tournadre, Jean; Dziak, Robert P.; Haxel, Joseph H.; Lau, T. -k. A.; Fowler, Matt; Salo, Sigrid A..
In late 2007, two massive icebergs, C19a and B15a, drifted into open water and slowly disintegrated in the southernmost Pacific Ocean. Archived acoustic records show that the high-intensity underwater sounds accompanying this breakup increased ocean noise levels at mid-to-equatorial latitudes over a period of ∼1.5 years. More typically, seasonal variations in ocean noise, which are characterized by austral summer-highs and winter-lows, appear to be modulated by the annual cycle of Antarctic iceberg drift and subsequent disintegration. This seasonal pattern is observed in all three Oceans of the Southern Hemisphere. The life cycle of Antarctic icebergs affects not only marine ecosystem but also the sound environment in far-reaching areas and must be...
Tipo: Text Palavras-chave: Antarctica; Iceberg; Ocean noise; Seasonality; Trend.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00205/31613/30035.pdf
Imagem não selecionada

Imprime registro no formato completo
Antarctic Sea Ice Proxies from Marine and Ice Core Archives Suitable for Reconstructing Sea Ice over the past 2000 Years ArchiMer
Thomas, Elizabeh R; Allen, Claire S; Etourneau, Johan; King, Amy Cf; Severi, Mirko; Winton, V. Holly L.; Mueller, Juliane; Crosta, Xavier; Peck, Victoria L..
Dramatic changes in sea ice have been observed in both poles in recent decades. However, the observational period for sea ice is short, and the climate models tasked with predicting future change in sea ice struggle to capture the current Antarctic trends. Paleoclimate archives, from marine sedimentary records and coastal Antarctic ice cores, provide a means of understanding sea ice variability and its drivers over decadal to centennial timescales. In this study, we collate published records of Antarctic sea ice over the past 2000 years (2 ka). We evaluate the current proxies and explore the potential of combining marine and ice core records to produce multi-archive reconstructions. Despite identifying 92 sea ice reconstructions, the spatial and temporal...
Tipo: Text Palavras-chave: Sea ice; Antarctica; Paleoclimate; Ice cores; Marine sediments.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00595/70709/68916.pdf
Imagem não selecionada

Imprime registro no formato completo
Antarctic sponges (Porifera, Demospongiae) of the South Shetland Islands and vicinity: part I. Spirophorida, Astrophorida, Hadromerida, Halichondrida and Haplosclerida Zoologia
Campos,Maurício; Mothes,Beatriz; Veitenheimer Mendes,Inga L..
The aim of this work is to redescribe 11 species of sponges collected through the Brazilian Antarctic Program (PROANTAR), at the South Shetland Islands and vicinity. New information is provided on the Antarctic sponge fauna, in regard to species richness and the geographical and bathymetric distributions of identified species. The following species were identified and are here illustrated and fully described: Cinachyra antarctica (Carter, 1872), Cinachyra barbata Sollas, 1886, Craniella leptoderma (Sollas, 1886), Tethyopsis longispinum (Lendenfeld, 1907), Polymastia invaginata Kirkpatrick, 1907, Homaxinella balfourensis (Ridley & Dendy, 1886), Suberites montiniger Carter, 1880, Halichondria (Eumastia) attenuata (Topsent, 1915), Haliclona...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; PROANTAR; Taxonomy.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000300021
Imagem não selecionada

Imprime registro no formato completo
Antarctic sponges (Porifera, Demospongiae) of the South Shetland Islands and vicinity: part II. Poecilosclerida Zoologia
Campos,Maurício; Mothes,Beatriz; Veitenheimer Mendes,Inga L..
In the present study 16 species are registered for the South Shetland Islands and vicinity: Acanthorhabdus fragilis Burton, 1929, Iophon unicornis Topsent, 1907, Clathria (Axosuberites) flabellata (Topsent, 1916), Clathria (Axosuberites) nidificata (Kirkpatrick, 1907), Kirkpatrickia variolosa (Kirkpatrick, 1907), Myxodoryx hanitschi (Kirkpatrick, 1907), Iotroata somovi (Koltun, 1964), Tedania (Tedaniopsis) charcoti (Topsent, 1907), Tedania (Tedaniopsis) vanhoffeni (Hentschel, 1914), Tedania (Tedaniopsis) oxeata (Topsent, 1916), Isodictya kerguelenensis (Ridley & Dendy, 1886), Isodictya lankesteri (Kirkpatrick, 1907), Isodictya toxophila Burton, 1932, Isodictya bentarti Ríos, Cristobo & Urgorri, 2004, Latrunculia (Latrunculia) brevis Ridley...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antarctica; New occurrences; PROANTAR; Taxonomy.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752007000300027
Imagem não selecionada

Imprime registro no formato completo
Antarctic tourism: Environmental concerns and the importance of Antarctica's natural attractions for tourists AgEcon
Tisdell, Clement A..
This article provides general background on the development of tourism in Antarctica and environmental concerns raised by it. However, the major part of it reports on and interprets the results from a survey of tourists visiting Antarctica on a cruise ship. Particular attention is given to the socioeconomic profiles of these tourists, their stated level of knowledge of Antarctica before and after their visit, the relative importance to these visitors of seeing different species of Antarctic wildlife and whether or not the opportunity of seeing Antarctic wildlife was of critical importance for their decision to visit Antarctica. The relative valuation by the sampled tourist of features of their Antarctic cruise is explored along with changes in their...
Tipo: Working or Discussion Paper Palavras-chave: Antarctica; Antarctica’s natural attractions; Cruise ships in Antarctica; Environmental conservation in Antarctica; Tourism in Antarctica; Wildlife conservation in Antarctica.; Consumer/Household Economics; Environmental Economics and Policy; L83; Q26; Q57.
Ano: 2010 URL: http://purl.umn.edu/97469
Imagem não selecionada

Imprime registro no formato completo
Antarctic Tourists: A Case Study of Their Evaluation of Antarctic Wildlife and Environmental Issues AgEcon
Tisdell, Clement A.; Wilson, Clevo; Kriwoken, Lorne.
Reports the results of surveys of Antarctic cruise ship passengers on the ‘Akademik Ioffe’ who undertook their Antarctic journey in January 2003. The prime purposes of the surveys were to determine the socio-economic profile of these travellers, evaluate the importance of Antarctic wildlife for their travel, their attitude to Antarctic wildlife conservation as well as environmental issues involving Antarctica, both prior to their tourist visit to Antarctica and following it. This paper reports on the socio-economic profile of respondents, their willingness to pay for their Antarctic trip, and their knowledge of Antarctica. The comparative importance of Antarctic wildlife as a factor motivating respondents to undertake their journey is assessed and the...
Tipo: Working or Discussion Paper Palavras-chave: Antarctic wildlife conservation; Environmental issues; Willingness to pay; Antarctica; Environmental Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/48980
Imagem não selecionada

Imprime registro no formato completo
Antarctic Tourists, Wildlife and the Environment: Attractions and Reactions to Antarctica AgEcon
Tisdell, Clement A.; Wilson, Clevo.
Provides background on the development and nature of Antarctic tourism and associated environmental issues, as well as agreements and regulations affecting environmental management in Antarctica. Following an outline of the survey methodology and provision of information on the socioeconomic profiles of the respondents, results of a survey of Antarctic tourists on the Russian registered ship the ‘Akademik Ioffe’ are reported. The importance of Antarctic wildlife as an attraction for these Antarctic tourists is then given particular attention. The study considers amongst other things how important Antarctic wildlife was in convincing these tourists to undertake their trip to Antarctica, the importance to the tourists of seeing different species of...
Tipo: Working or Discussion Paper Palavras-chave: Antarctica; Tourism; Wildlife; Antarctic Treaty; Madrid Protocol; Environmental protection.; Environmental Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/51295
Imagem não selecionada

Imprime registro no formato completo
Antibacterial activity of the Antarctic bacterium Janthinobacterium sp: SMN 33.6 against multi-resistant Gram-negative bacteria Electron. J. Biotechnol.
Asencio,Geraldine; Lavin,Paris; Alegría,Karen; Domínguez,Mariana; Bello,Helia; González-Rocha,Gerardo; González-Aravena,Marcelo.
Background The increment of resistant strains to commonly used antibiotics in clinical practices places in evidence the urgent need to search for new compounds with antibacterial activity. The adaptations that Antarctic microorganisms have developed, due to the extreme environment that they inhabit, promote them as a potential new source of active compounds for the control of microorganisms causing infections associated with health care. The aim of this study was to evaluate the antibacterial activity of an ethanol extract of the Antarctic bacterium Janthinobacterium sp., strain SMN 33.6, against nosocomial multi-resistant Gram-negative bacteria. Results Inhibitory activity against human Gram-negative bacterial pathogens, with concentrations that varied...
Tipo: Journal article Palavras-chave: Antarctica; Antimicrobial; Antibiotic resistance; Bacterial pigment.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000100001
Imagem não selecionada

Imprime registro no formato completo
Antropogenic radionuclides in plants, animals and their environments in Antarctica IBSS Repository
Giuliani, S.; Triulz, C.; Vaghi, M..
In the framework of the Italian National Research Program in Antarctica (PNRA), the Laboratory of Radioecology of the University of Parma developed from 1987 several researches on terrestrial and marine samples. At first the prin-cipal aim was the study of 90Sr, 137Cs, 238Pu, 239+240Pu and 241Am concentrations in samples of soil, ice, seawater and biota collected near the Italian Antarctic Base (Ross Sea, Terra Nova Bay).
Tipo: Journal Contribution Palavras-chave: Antarctica; Pollution; 137Cs; 239+240Pu; 238Pu and 241Am; Антарктика; Загрязнение Pollution Pollution http://aims.fao.org/aos/agrovoc/c_6077.
Ano: 2003 URL: http://repository.ibss.org.ua/dspace/handle/99011/39
Imagem não selecionada

Imprime registro no formato completo
Biodiversidad y distribución temporal de zooplancton gelatinoso en bahía Fildes OceanDocs
Mora, G..
El proyecto “Biodiversidad y distribución temporal de zooplancton gelatinoso en bahía Fildes”, perteneciente al Programa de Apoyo a Tesis en Temas Antárticos, organizado por el INACH, aportará información sobre la fluctuación temporal, de corto plazo, de los principales grupos de zooplancton gelatinoso (medusas, sifonóforos, quetognatos, ctenóforos y salpas) y su asociación con las variables ambientales de temperatura y salinidad.
Tipo: Journal Contribution Palavras-chave: Zooplankton; Biodiversity; Antarctica.
Ano: 2011 URL: http://hdl.handle.net/1834/4502
Imagem não selecionada

Imprime registro no formato completo
Cephalopoda as prey of juvenile Southern elephant seals at Isla 25 de Mayo/King George, South Shetland Islands Iheringia, Sér. Zool.
Burdman,Luciana; Daneri,Gustavo A.; Negrete,Javier; Mennucci,Jorge A.; Marquez,Maria E. I..
The aim of the present study was to enhance the knowledge of the feeding habits of the juvenile component of the population of Southern elephant seals [Mirounga leonina (Linnaeus, 1758)] from Isla 25 de Mayo, South Shetland Islands, age class whose diet information is scarce. A total of 60 individuals were stomach lavaged in the spring - summer seasons of three consecutive years (2003, 2004 and 2005) of which 53.3 % (n = 32) presented food remnants. The Antarctic glacial squid Psychroteuthis glacialis Thiele, 1921 was the dominant prey taxon in terms of frequency of occurrence (68.7%), numerical abundance (60.1%) and biomass (51.5%), contributing 84.1% to the total relative importance index. Other squid prey species of importance were Slosarczykovia...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mirounga; Diet; Antarctica.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000100012
Imagem não selecionada

Imprime registro no formato completo
Checklist of the Discomycetes (Fungi) of Patagonia, Tierra del Fuego and adjacent antarctic areas Darwiniana
Gamundí,Irma J.; Minter,David W.; Romero,Andrea I.; Barrera,Viviana A.; Giaiotti,Andreina L.; Messuti,María I.; Stecconi,Marina.
Information about fungi of the orders Cyttariales, Helotiales, Ostropales, Pezizales, Rhytismatales and Thelebolales (Discomycetes) collected in Patagonia, Tierra del Fuego and adjacent antarctic areas (Patagonia), and information about their associated organisms was located, abstracted, keyboarded, edited and validated. The largest single information sources were dried reference collections in Argentina and elsewhere, and published information as listed in this work's bibliography. Other records were derived from fresh collections, other reference collections and field observations. Information is stored in a computerized system of relational databases for taxonomic, nomenclatural, bibliographic and biological observations data. This system allows storage...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Discomycetes; Patagonia; Tierra del Fuego; Antarctica; Checklist.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932004000100006
Imagem não selecionada

Imprime registro no formato completo
Chemical characterization of exopolysaccharides from Antarctic marine bacteria ArchiMer
Nichols, Carol; Lardiere, Sandrine; Bowman, John; Nichols, Peter; Gibson, John; Guezennec, Jean.
Exopolysaccharides (EPS) may have an important role in the Antarctic marine environment, possibly acting as ligands for trace metal nutrients such as iron or providing cryoprotection for growth at low temperature and high salinity. Ten bacterial strains, isolated from Southern Ocean particulate material or from sea ice, were characterized. Whole cell fatty acid profiles and 16S rRNA gene sequences showed that the isolates included representatives of the genera Pseudoalteromonas, Shewanella, Polaribacter, and Flavobacterium as well as one strain, which constituted a new bacterial genus in the family Flavobacteriaceae. The isolates are, therefore, members of the "Gammaproteobacteria" and Cytophaga-Flexibacter-Bacteroides, the taxonomic groups that have been...
Tipo: Text Palavras-chave: Marine particulates; Sea ice; Marine bacteria; Antarctica; Exopolysaccharides.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-623.pdf
Imagem não selecionada

Imprime registro no formato completo
Chemical, physical and mineralogical analysis of soil and marine sediments from King George Island, South Shetland Archipelago, Antarctica. Repositório Alice
SCHUCH, L. A.; ZAGO, A.; AZEVEDO, A. C. de; REINERT, D. J.; BARRETO, W. de O.; SANTOS, H. G. dos; NORDEMANN, D. J. R..
During the summer months 1988/89 and 1991/92, soil and marine sediments samples were collected around the Brazilian Antarctic Station "Comandante Ferraz" (62§S,58§W) located on King George Island, South Shetland Archipelago. X Ray Diffractions (XRD) of clay fractions and another pedological analysis were carried out. Great differences were observed between soil layer 1 (0-5 cm) and soil layer 2(5-10 cm) regarding to particle size and chemical characteristics. The XRD patterns did not show differences among layers. The marine sediments present a finer particle size distribution. In these sediments there is a dominance of both regular and irregular interestratified minerals as well as mica-biotite. The physical, chemical and mineralogical soil...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Baia almirantado; Admiralty Bay; Solo; Sedimento; Antarctica; Sediments; Soil.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/335100
Imagem não selecionada

Imprime registro no formato completo
Circulation and water mass transports on the East Antarctic shelf in the Mertz Glacier region ArchiMer
Martin, Antoine; Houssais, Marie-noelle; Le Goff, Herve; Marec, Claudie; Dausse, Denis.
The East Antarctic shelf off Adélie-George V Land is known to be an important region for Dense Shelf Water (DSW) formation as a result of intense sea ice production in the Mertz Glacier Polynya during the winter season. It is also a region where the warm modified Circumpolar Deep Water (mCDW) penetrates onto the shelf during the summer. Using hydrographic observations from a summer survey in 2008 we implement a box inverse model to propose a comprehensive view of the steady state circulation on this shelf in summer. Additional information from mooring observations collected on the depression slope is used to provide context to the retrieved circulation scheme. Over the depression slope, the summer baroclinic structure of the currents is found to contrast...
Tipo: Text Palavras-chave: Antarctica; Continental shelf; Modified Circumpolar Deep Water; Heat transport; Freshwater transport; Adelie Georges V Land.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00386/49766/50302.pdf
Imagem não selecionada

Imprime registro no formato completo
Clio piatkowskii, a mesopelagic pteropod new to science (Gastropoda, Opisthobranchia) Naturalis
Spoel, S. van der; Schalk, P.H.; Bleeker, J..
A pteropod species new to science: Clio piatkowskii is described from benthopelagic samples taken in high Antarctic waters of the Weddell Sea. Comparisons with related species are made and its taxonomic place in the genus Clio is discussed.
Tipo: Article / Letter to the editor Palavras-chave: Gastropoda; Pteropoda; Clio; Taxonomy; Plankton; Antarctica.
Ano: 1992 URL: http://www.repository.naturalis.nl/record/504812
Imagem não selecionada

Imprime registro no formato completo
Cloning and expression analysis of allograft inflammatory factor type 1 in coelomocytes of antarctic sea urchin (Sterechinus neumayeri) ArchiMer
Ovando, Fernanda; Gimpel, Carla; Cardenas, Constanza; Machado Cunha Da Silva, Jose Roberto; De Lorgeril, Julien; Gonzalez, Marcelo.
We have cloned and characterized for the first time an allograft inflammatory factor 1 (Sn-AIF-1) from the Antarctic sea urchin. We report the cloning of Sn-AIF-1 cDNA and the characterization of its expression in coelomocytes after a bacterial challenge. The cDNA Sn-AIF-1 has a size of 608 bp and encodes a polypeptide of 151 aa. The deduced amino acid sequence has a putative size of 17.430 Da, an isoelectric point of 4.92, and shows 2 elongation factor handlike motifs that normally bind calcium ions. BLAST analysis revealed close matches with other known AIF-1. The deduced amino acid sequence of Sn-AIF-1 showed high homology with AIF-1 in vertebrates such as fish, mice, and humans; and in the case of invertebrates, the major degree of identity (55%) was...
Tipo: Text Palavras-chave: Antarctica; Sea urchin; Sterechinus neumayeri; Coelomocytes; Gene expression; AIF-1.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20955/18572.pdf
Registros recuperados: 69
Primeira ... 1234 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional