High input of organic carbon and/or slowly renewing bottom waters frequently create periods with low dissolved oxygen concentrations on continental shelves and in coastal areas; such events can have strong impacts on benthic ecosystems. Among the meiofauna living in these environments, benthic foraminifera are often the most tolerant to low oxygen levels. Indeed, some species are able to survive complete anoxia for weeks to months. One known mechanism for this, observed in several species, is denitrification. For other species, a state of highly reduced metabolism, essentially a state of dormancy, has been proposed but never demonstrated. Here, we combined a 4 weeks feeding experiment, using C-13-enriched diatom biofilm, with correlated TEM and NanoSIMS imaging, plus bulk analysis of concentration and stable carbon isotopic composition of total organic matter and individual fatty acids, to study metabolic differences in the intertidal species Ammonia tepida exposed to oxic and anoxic conditions. ...
Background: Symbiosis is a phenomenon that allows organisms to colonise a wide range of environments and occupy a variety of ecological niches in marine environments. Large benthic foraminifera (LBF) are crucial marine calcifiers that rely on photo-endosymbionts for growth and calcification, yet the influence of environmental conditions in shaping their interactions with prokaryotic and eukaryotic associates is poorly known.. Results: Here, we used next-generation sequencing to identify eukaryotic photosynthesizing and prokaryotic microbes associated with the common LBF Amphistegina lobifera across a physio-chemical gradient on the Great Barrier Reef (GBR). We collected samples from three reef sites located in the inner-, mid-and outer-shelf regions of the northern section of the GBR. Results showed the consistent presence of Bacillaryophyta as the main eukaryotic taxa associated with A. lobifera across all reef sites analysed; however, the abundance and the diversity of prokaryotic organisms ...
Ligia L. Perez-Cruz, Maria Luisa Machain-Castillo; Benthic foraminifera of the oxygen minimum zone, continental shelf of the Gulf of Tehuantepec, Mexico. Journal of Foraminiferal Research ; 20 (4): 312-325. doi: https://doi.org/10.2113/gsjfr.20.4.312. Download citation file:. ...
Large benthic foraminifera are unicellular calcifying reef organisms that can form symbiotic relationships with a range of different microalgae. However, the cellular functions, such as symbiosis and calcification, and other aspects of cellular physiology in large benthic foraminifera are not fully understood. Amphisorus kudakajimensis was used as a model to determine the detailed cellular characteristics of large benthic foraminifera. We used calcein acetoxymethyl ester (calcein AM) as a fluorescent indicator for live confocal imaging. We demonstrated that calcein AM is a useful fluorescent indicator to stain the fine network of reticulopodia and the cytoplasm in living A. kudakajimensis. We showed that at least two types of reticulopodia exist in A. kudakajimensis: the straight bundle of reticulopodia that spreads from the aperture and the fine reticulopodia along the surface of the aperture and chamber walls. The cytoplasm in outer chambers was highly branched and contained a few dinoflagellates. In
Foraminifera are single-celled eukaryotes (protists) of large ecological importance, as well as environmental and paleoenvironmental indicators and biostratigraphic tools. In addition, they are capable of surviving in anoxic marine environments where they represent a major component of the benthic community. However, the cellular adaptations of Foraminifera to the anoxic environment remain poorly constrained. We sampled an oxic-anoxic transition zone in marine sediments from the Namibian shelf, where the genera Bolivina and Stainforthia dominated the Foraminifera community, and use metatranscriptomics to characterize Foraminifera metabolism across the different geochemical conditions. Relative Foraminifera gene expression in anoxic sediment increased an order of magnitude, which was confirmed in a 10-day incubation experiment where the development of anoxia coincided with a 20-40-fold increase in the relative abundance of Foraminifera protein encoding transcripts, attributed primarily to those involved
Temperatures derived from Mg/Ca ratios of the calcite tests of planktonic foraminifera are distorted when samples are partially dissolved, and methods are required to quantify this source of inaccuracy. Here we compare a dissolution index (XDX), based on X-ray computed tomography scans, to Mg/Ca of four species of foraminifera ( G. ruber (white), G. sacculifer (without sac), N. dutertrei, and P. obliquiloculata) from core top sediments from the tropical Pacific, Atlantic, and western Indian Ocean. Deepwater calcite saturation values (Δ[CO 3 2−]) at the sites ranged from 55 to −23 μmol/kg. An estimate of ΔMg/Ca (reduction in Mg/Ca due to dissolution) was made for each sample. ΔMg/Ca decreased linearly from deepwater Δ[CO 3 2−] values of between 10 (±4) and 15 (±5) μmol/kg. These values are minimum estimates of the threshold below which Mg/Ca is affected by dissolution, as they are limited by assumptions made in calculating ΔMg/Ca. Sensitivity of Mg/Ca to Δ[CO 3 2−] was greatest ...
Species-range expansions are a predicted and realized consequence of global climate change. Climate warming and the poleward widening of the tropical belt have induced range shifts in a variety of marine and terrestrial species. Range expansions may have broad implications on native biota and ecosystem functioning as shifting species may perturb recipient communities. Larger symbiont-bearing foraminifera constitute ubiquitous and prominent components of shallow water ecosystems, and range shifts of these important protists are likely to trigger changes in ecosystem functioning. We have used historical and newly acquired occurrence records to compute current range shifts of Amphistegina spp., a larger symbiont-bearing foraminifera, along the eastern coastline of Africa and compare them to analogous range shifts currently observed in the Mediterranean Sea. The study provides new evidence that amphisteginid foraminifera are rapidly progressing southwestward, closely approaching Port Edward (South Africa)
Hilbrecht, H. , Hubberten, H. W. and Oberhänsli, H. (1992): Biogeography of planktonic foraminifera and regional carbon isotope variations productivity and water masses in Late Cretaceous Europe , Palaeogeography Palaeoclimatology Palaeoecology ...
Hayward, B.W.; Le Coze, F.; Gross, O. (2018). World Foraminifera Database. Virgulina recta var. howei Cushman, 1936 †. Accessed at: http://marinespecies.org/foraminifera/aphia.php?p=taxdetails&id=930648 on 2019-10-20 ...
Foraminifera responded to both heavy and light oiling of marshes relative to unoiled control sites by changes to both standing stock and depth of habitation (DOH) in sediment following the 2010 Macondo well blowout. Push cores were taken from the middle marsh at sites classified as unoiled, lightly oiled, and heavily oiled based on concentrations of total polycyclic aromatic hydrocarbons ([TPAH]). Cores were sliced and stained with rose Bengal to detect live specimens of foraminifera. Short-term, sediment-mixing depths were determined using the penetration depths of excess Th-234, and sedimentary organic carbon and carbonate were measured to distinguish depositional environments. Marsh foraminifera reacted to the highest oil concentration (5,000-18,000 ng/g of TPAH) by reducing standing stock and shortening the DOH compared with the control sites. At a second, less heavily oiled site, foraminifera responded with a shallower DOH, but with a boom in standing stock. Deformed, dead foraminifera occurred in
Jenkins, D Graham; Srinivasan, M S (1986): (Table 10C) Occurrences of planktonic foraminifers in selected samples of DSDP Hole 90-588C. PANGAEA, https://doi.org/10.1594/PANGAEA.250141, In supplement to: Jenkins, DG; Srinivasan, MS (1986): Cenozoic planktonic foraminifers from the Equator to the Sub-Antarctic of the Southwest Pacific. In: Kennett, JP; von der Borch, CC; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 90, 795-834, https://doi.org/10.2973/dsdp.proc.90.113.1986
RICHARDSON, Susan L., Wilkes Honors College, Florida Atlantic University, 5353 Parkside Drive, RF-109, Jupiter, FL 33458, [email protected] Molecular phylogenetics and systematics have revolutionized our current understanding of the evolutionary relationships of Foraminifera; however, molecular studies are constrained by the necessary requirement that only living organisms can be sampled. Molecular phylogenetic trees, therefore, depict only crown groups (clades delimited by extant taxa). Where do fossil foraminiferans fit into these trees? Most microfossils recognized as foraminiferans fall within the crown clade Foraminifera. For example, Platysolenites, the oldest fossil unequivocally recognized as a foraminiferan, shares a suite of morphological characters with modern Ammobaculites and Bathysiphon species, indicating that this taxon is more closely related to multi-chambered foraminiferans than to single-chambered, allogromiid-grade foraminiferans. Reconciling the named subclades depicted in ...
Lagenida are an order of calcareous [[benthic]] [[Foraminifera,foraminifers]] closely related to, and possibly derived from within, the [[Palaeozoic]] [[Fusulinida]]. Lagenides first appeared during the [[Carboniferous]], but did not become a significant part of the fauna until the latter part of the [[Permian]], when the fusulinides underwent a sharp decline before their extinction at the end of the Permian (Groves et al., 2003). Today, the lagenides include about 120 living genera, and are one of the major living groups of calcareous foraminifers after [[Miliolida]] and [[Rotaliida ...
Edgcomb, V.P., M.G. Pachiadaki, P. Mara, K.A. Kormas, E.R. Leadbetter, J.M. Bernhard (2016) Gene expression profiling of microbial activities and interactions in sediments under haloclines of E. Mediterranean deep hypersaline anoxic basins. ISME Journal, doi:10.1038/ismej.2016.58. Wit, J. C., Davis, M. M., McCorkle, D. C., & Bernhard, J. M. (2016). A SHORT-TERM SURVIVAL EXPERIMENT ASSESSING IMPACTS OF OCEAN ACIDIFICATION AND HYPOXIA ON THE BENTHIC FORAMINIFER GLOBOBULIMINA TURGIDA. JOURNAL OF FORAMINIFERAL RESEARCH, 46(1), 25-33.. van Hengstum, P. J., & Bernhard, J. M. (2016). A NEW SPECIES OF BENTHIC FORAMINIFERA FROM AN INLAND BAHAMIAN CARBONATE MARSH. JOURNAL OF FORAMINIFERAL RESEARCH, 46(2), 193-200.. Nomaki, H., Bernhard, J. M., Ishida, A., Tsuchiya, M., Uematsu, K., Tame, A., Kitahashi, T., Takahata, N., Sano, Y., & Toyofuku, T. (2016). Intracellular Isotope Localization in Ammonia sp (Foraminifera) of Oxygen-Depleted Environments: Results of Nitrate and Sulfate Labeling Experiments. ...
Core HLY0503-18TC used for this study was taken during the 2005 Healy-Oden Trans-Arctic Expedition (HOTRAX) on the central Lomonosov Ridge. The coring site is located in a local Intra Basin, a ,1000 m deep depression in the ridge morphology, where sedimentation appears to be focused and accumulation rates, thus, are higher (Björk et al., 2007). The uppermost 70 cm of core HLY0503-18TC contains high abundances of well preserved planktonic and benthic foraminifera and calcareous nannofossils. The planktonic foraminifera assemblage in the ,125 μm size fraction is monospecific and consists of Neogloboquadrina pachyderma, of which ,95% are of the left-coiling variety. Stable isotope measurements of the ,150 μm size fraction on N. pachyderma (s) show a distinct δ13C minimum at 35-40 cm depth. Similar changes in δ13C in previous studies have been associated with a major melt water anomaly at the beginning of Termination I (Nørgaard-Pedersen et al., 1998; Stein et al., 1994). We also see other ...
ABSTRACT. Recent processing of additional samples, re-processing of the M. Makrides samples and re-evaluation of benthic and planktic foraminifera assemblages previously described from Mzamba Cliff, has led to the finding of several rare species that support previous ammonite datings of the succession. These include numbers of the planktic species Dicarinella asymetrica (Sigal) and Sigalia sp., which are limited to the Middle to Late Santonian, and to the Middle Santonian, respectively. Sigalia sp. appears to be a different species from the widely distributed Sigalia deflaensis (Sigal), as it is distinguished by depressed sutures throughout. Alternatively Sigalia sp. maybe avariant limited to shallow or temperate waters; or it may be a juvenile form of Sigalia deflaensis. In addition, rare tests of the Santonian larger benthic foraminifera Pseudosiderolites sp. have been found, the first such larger foraminifera from the Late Cretaceous succession of southern Africa. Comments on the possible ...
TY - JOUR. T1 - Amino acid racemization in mono-specific foraminifera from Quaternary deep-sea sediments. AU - Kaufman, Darrell S. AU - Cooper, Katherine. AU - Behl, Richard. AU - Billups, Katharina. AU - Bright, Jordon. AU - Gardner, Karleen. AU - Hearty, Paul. AU - Jakobsson, Martin. AU - Mendes, Isabel. AU - OLeary, Michael. AU - Polyak, Leonid. AU - Rasmussen, Tine. AU - Rosa, Francisca. AU - Schmidt, Matthew. PY - 2013/4. Y1 - 2013/4. N2 - The deep-sea environment is among the most stable on Earth, making it well suited for amino acid geochronology. Foraminifera with calcareous tests are distributed across the World Ocean and are often recovered in sufficient abundance from sediment cores to derive robust mean amino acid D/L values of multiple replicates from each stratigraphic level. The extent of racemization (D/L) can be compared with independent age control, which in most cases is based on correlation with global marine oxygen-isotope stages and radiocarbon ages from the same ...
ABSTRACT. Four outcrops of Late Cretaceous rocks are known in the East London region of the Eastern Cape Province, discovered at different times during the 20th century. These are at the Needs Camp upper and lower quarries, inland of East London; and at Igoda River mouth and a nearby road cutting close to the estuary, located to the south of East London, designated the Igoda Formation. All four sites contain similar foraminiferal assemblages, and the successions are interpreted as roughly coeval. The published record from the two Igoda Formation outcrops up to now consists of just one foraminifera species (Spiroplectinella sp.), and about 20 Cretaceous species have been reported from the Needs Camp quarries. However, examination of additional samples, as well as repeated reprocessing of previously-studied limestone samples from the four outcrops has led to the discovery of 87 species of foraminifera. Only five of these are planktic species, mainly very rare Heterohelix globulosa (Ehrenberg), ...
basis of record Gross, O. (2001). Foraminifera, ,B,,I,in,/I,,/B,: Costello, M.J. ,i,et al.,/i, (Ed.) (2001). ,i,European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels,,/i, 50: pp. 60-75 (look up in IMIS) [details] ...
We investigated the possibility of bacterial symbiosis in Globigerina bulloides, a palaeoceanographically important, planktonic foraminifer. This marine protist is commonly used in micropalaeontological investigations of climatically sensitive subpolar and temperate water masses as well as wind-driven upwelling regions of the worlds oceans. G. bulloides is unusual because it lacks the protist algal symbionts that are often found in other spinose species. In addition, it has a large offset in its stable carbon and oxygen isotopic compositions compared to other planktonic foraminifer species, and also that predicted from seawater equilibrium. This is suggestive of novel differences in ecology and life history of G. bulloides, making it a good candidate for investigating the potential for bacterial symbiosis as a contributory factor influencing shell calcification. Such information is essential to evaluate fully the potential response of G. bulloides to ocean acidification and climate change. To ...
In PNAS, two companion studies by Levy et al. (1) and Gasson et al. (2) underscore the importance of ice-proximal geologic data for improving computer models of Antarctic ice sheet response to oceanic and atmospheric warming. Current knowledge of Antarctic ice sheet evolution (∼40-0 Ma) is based on deep-sea records of global ice volume, deep ocean temperature, and carbon cycling preserved in the calcium carbonate shells of benthic foraminifera (3, 4). Shackleton and Kennett (5) hypothesized, from moderate-resolution southwest Pacific Ocean benthic foraminifer stable oxygen (δ18O) and carbon (δ13C) isotope compilations, that the deep ocean cooled ∼15 °C through the Cenozoic and that Antarctic ice sheets expanded significantly at the Eocene-Oligocene boundary, varied dynamically until the middle Miocene climate transition (MMCT; 14.2-13.8 Ma), and then rapidly expanded and stabilized. Over the last 41 y, paleoceanographers have used deep-sea sediments recovered by scientific ocean drilling ...
Foraminiferan test from Iriomote Jima, Ryukyu Islands, Japan (Baculogypsina sp.), coloured scanning electron micrograph (SEM). Foraminifera produce (most commonly) a calciferous test (skeleton) which is divided into chambers. Live forams have filopodia that are united in a complex fashion to produce reticulopodia. Known as star sand. Magnification: x8 when shortest axis printed at 25 millimetres. - Stock Image C032/1072
Hess, Silvia; Alve, Elisabeth; Trannum, Hilde Cecilie & Norling, Karl (2013). Benthic foraminiferal responses to water-based drill cuttings and natural sediment burial: Results from a mesocosm experiment. Marine Micropaleontology. ISSN 0377-8398. 101, s 1- 9 . doi: 10.1016/j.marmicro.2013.03.004 Show summary Effects of burial by water-based drill cuttings and natural test sediment on living (stained) benthic foraminifera were investigated in a mesocosm experiment. After 193 days, the foraminiferal response in sediment covered with drill cuttings was compared to the response in sediment covered with defaunated natural test sediment. Increasing thickness of added material, independent of type of material, significantly reduced the benthic foraminiferal abundance and species richness. While most species managed to migrate through added sediments of up to 12 mm thickness, results indicate that a burial depth of 24 mm severely limits the migration capability of the foraminifera. Textularia earlandi ...
Exon, Neville F; Kennett, James P; Malone, Mitchell J; Shipboard Scientific Party (2005): Paleontological investigation on planktonic foraminifers of ODP Hole 189-1172A. PANGAEA, https://doi.org/10.1594/PANGAEA.270718
Orthophragmines from late Lutetian (Alaman), Bartonian (Keçili) and early Priabonian (Sarköy) localities in Turkey are described and illustrated for the first time. Biometry of megalospheric individuals, based on a large number of free specimens sectioned mainly in the equatorial plane, contributes to our knowledge about the orthophragmines in several aspects. They are of western Tethyan affinity and belong to the evolutionary lineages of the genera Discocyclina, Nemkovella, Orbitoclypeus and Asterocyclina, known mainly from the European part of peri-Mediterranean region. Identified foraminifera are categorized into evolutionary lineages, different developmental stages of which are distinguished by biometrically defined subspecies. Two new species of Asterocyclina, A. sireli n. sp. and A. ferrandezi n. sp. from the late Lutetian and early Priabonian respectively, one subspecies of Discocyclina, D. trabayensis elazigensis n. ssp. and one of Orbitoclypeus, O. douvillei malatyaensis n. ssp., ...
Researchers from the University of Bonn found out that tiny foraminifera in the oceans can save islands. The climate is getting warmer, and sea levels are rising - a threat to island nations. As a group of researchers lead by colleagues from the University of Bonn found out, at the same time, tiny single-cell organisms are spreading rapidly through the worlds oceans, where they might be able to mitigate the consequences of climate change. Foraminifera of the variety Amphistegina are stabilizing coastlines and reefs with their calcareous shells. The studys results have now appeared in the international online journal PLOS ONE.. Countless billions of tiny, microscopic shelled creatures known as foraminifera inhabit the oceans of our planet: some of which look like little stars, others like Swiss cheese, and yet others like tiny mussels. They are extremely plentiful and exceptionally diverse in shape. Most of the approximately 10,000 foraminifera species live on the bottom of tropical and ...
Ocean anoxic events were periods of high carbon burial that led to drawdown of atmospheric carbon dioxide, lowering of bottom-water oxygen concentrations and, in many cases, significant biological extinction (Arthur et al., 1990; Erbacher et al., 1996, doi:10.1130/0091-7613(1996)0242.3.CO;2; Kuypers et al., 1999, doi:10.1038/20659; Jenkyns, 1997; Hochuli et al., 1999, doi:10.1130/0091-7613(1999)0272.3.CO;2). Most ocean anoxic events are thought to be caused by high productivity and export of carbon from surface waters which is then preserved in organic-rich sediments, known as black shales. But the factors that triggered some of these events remain uncertain. Here we present stable isotope data from a mid-Cretaceous ocean anoxic event that occurred 112 Myr ago, and that point to increased thermohaline stratification as the probable cause. Ocean anoxic event 1b is associated with an increase in surface-water temperatures and runoff that led to decreased bottom-water formation and elevated carbon ...
The Deepwater Horizon blowout in 2010 released an estimated 4.9 million barrels of crude oil into the Gulf of Mexico in the 83 days between the initial explosion and the capping of the well. Response included extensive use of Corexit© oil dispersant. Although South Florida was spared exposure by currents, this event highlights the need for effective bioassay organisms for coral reefs. Amphistegina spp. are benthic foraminifers that host diatom symbionts in a relationship similar to that of coral and their zooxanthellae. Amphistegina spp. occur abundantly in reef communities nearly worldwide, are easily collected and maintained in culture, and are a key component of the FoRAM Index, a indicator of water and sediment quality in coastal waters. The major goals of this project were to develop protocols to test the acute and chronic responses of A. gibbosa to potentially toxic organic chemicals. Initial objectives were to determine lethal concentrations and effects ranges, as defined by the US
We collected modern foraminiferal and environmental data from three back-barrier intertidal sites (Currituck Barrier Island, Oregon Inlet, and Pea Island) of the Outer Banks, North Carolina, United States, which have different salinity settings and a wind-driven tidal regime. The foraminiferal assemblages indicate that a vertical zonation of foraminifera occurs, with several significant site-specific variations of assemblages. The intertidal zone can be divided into two elements: first, an agglutinated assemblage that is restricted to the vegetated marsh and is dominated by Ammobaculites crassus, Ammobaculites subcatenulatus, Arenoparrella mexicana, Jadammina macrescens,Miliammina fusca, and Trochammina inflata and, second, a calcareous assemblage that dominates the mudflats and sandflats of the intertidal zone, characterized by Ammonia parkinsoniana, Elphidium excavatum, and Haynesina germanica. We used canonical correspondence analysis and partial canonical correspondence analyses of the ...
A gravity core (GC12) was collected from a depth of 990.5 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). 13-C values were recorded for 5 foraminiferal species through the core, with results varying considerably throughout the last 30kyr. The 13-C values of the benthic Cibicidoides spp. are the lowest, whilst those for the planktonic species are comparable, once correlated for their vital effects (except Globorotalia truncatulinoides because no correction for vital effects is available). It is apparent from the 13-C values that there are 3 main 13-C phases during the glacial/interglacial transition: Glacial, Deglaciation and Holocene phases.. ...
Hemleben, C., Mohlen, D., Olsson, R. K. & Berggren, W. A. (1991). Surface texture and the first occurrence of spines in planktonic foraminfera from the early Tertiary. Geologisch Jarhbuch. 128: 117-146. gs. Koutsoukos, E. (2014). Phenotypic plasticity, speciation, and phylogeny in Early Danian planktic foraminifera. Journal of Foraminiferal Research. 44: 109-142. gs. Morozova, V. G. (1959). Stratigraphy of the Danian-Montian deposits of the Crimea according to the foraminifera. Doklady Akademii Nauk SSSR. 124(5): 1113-1115. gs. Olsson, R. K., Hemleben, C., Berggren, W. A. & Huber, B. T. (1999). Atlas of Paleocene Planktonic Foraminifera. Smithsonian Institution Press, Washington, DC. 1-252. gs. ...
Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 97-123. gs. Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 3-50. gs. Brönnimann, P. & Resig, J. (1971). A Neogene globigerinacean biochronologic time-scale of the southwestern Pacific. Initial Reports of the Deep Sea Drilling Project. 7(2): 1235-1469. gs. Brönnimann, P. (1951a). Globigerinita naparimaensis n. gen., n. sp., from the Miocene of Trinidad, B. W. I. Contributions from the Cushman Foundation for ...
During the early Paleogene, a long-term warming trend of Earths climate was punctuated by a major global warming event, known as the Paleocene-Eocene Thermal Maximum (PETM) and marked by a carbon isotope excursion (CIE) and an acidification episode. The associated worldwide environmental perturbations are best studied in open marine settings, and resulted in a major extinction event in deep-sea benthic foraminifera, followed by migration and diversification. Yet, the evolutionary impact on shelf foraminiferal faunas is still poorly constrained due the inherent stratigraphic complexities in these environments. In order to understand the prelude and aftermath of peak warming during the PETM, we study the South Dover Bridge core (SDB), drilled in the US Atlantic Coastal Plain in Maryland. Here, the Paleocene-Eocene transition is stratigraphically well constrained by calcareous nannoplankton and stable isotope records. Additionally, the PETM is regionally characterized by the appearance of ...
The Paleogene (/ˈpæliədʒiːn, ˈpeɪliə-/; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 million years ago (Mya) to the beginning of the Neogene Period 23.03 Mya. It is the beginning of the Cenozoic Era of the present Phanerozoic Eon.[7] The Paleogene is most notable for being the time during which mammals diversified from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous-Paleogene extinction event that ended the preceding Cretaceous Period.[8]. This period consists of the Paleocene, Eocene, and Oligocene epochs. The end of the Paleocene (55.5/54.8 Mya) was marked by the Paleocene-Eocene Thermal Maximum, one of the most significant periods of global change during the Cenozoic, which upset oceanic and atmospheric circulation and led to the extinction of numerous deep-sea benthic foraminifera and on land, a ...
The Mid-Pleistocene Transition, which lasted from approximately 1.25 million to 700 thousand years ago, was a period during which the dominant periodicity of Earths climate cycles inexplicably changed from 41 thousand to 100 thousand years. This change is clearly apparent in the oxygen isotopic composition of many calcifying marine organisms, but changes in both ice volume and temperature affect the signal, and so exactly what the signal means has remained unclear. Elderfield et al. (p. 704; see the Perspective by Clark) separated these two effects by measuring both the oxygen isotopic makeup and the Mg/Ca (a proxy that reflects changes in temperature only) of certain benthic foraminifera. The findings reveal the contributions of ice volume and temperature to glacial cycles, suggest when and why the Mid-Pleistocene Climate Transition occurred, and clarify how carbon is lost from the ocean-atmosphere during deglaciations but also changes because of ocean circulation. ...
This NERC-funded research investigates changes to the ocean-climate system from the warm mid-Pliocene to present day (~4 million years ago to the present) in the southwest Pacific Ocean (Figure A). This time period is particularly interesting as it encompasses large climatic transitions of the Pliocene-Pleistocene boundary (~2.6 million years ago), the mid-Pleistocene Transition (~1.2 million years ago), and glacial-interglacial scale climatic variability (encompassing both 100,000- and 41,000- year cyclicity). Additionally, this research aims to examine causes for the unexplained benthic foraminifera Stilostomella Extinction across the mid-Pleistocene Transition.. Specifically, we aim to answer the following three key questions:. (i) did intermediate waters cool from the Pliocene to the Pleistocene ...
A suite of salt-marsh peat samples from four sites along the coast of Maine (Wells, Phippsburg, Gouldsboro, and Machiasport) has been analyzed using high-precision techniques to determine local relative sea-level trends and to evaluate proposed along-coast warping. A spatially variable set of relative sea-level records in Maine would have important implications for geophysical models that predict the response of the lithosphere during deglaciation and postglacial isostatic relaxation. These models are often at odds with observed relative sea-level indicators near the margins of former glaciation, including those from Maine. Assemblages of agglutinated benthic foraminifera occur in vertical zones on the surface of modern salt marshes in Maine and can be used to accurately locate former mean high water levels in cores. Additional tools in this study include accelerator mass spectrometer 14C dating of individual plant fragments and precise leveling of elevations. The amplification of M2 tidal range in the
Bacterial biofilms as a trophic resource for certain benthic foraminifera. Marine Ecology Progress Series Marine Ecology Progress Series. 83:263-272. 1992 ...
Basak, C, Rathburn, T, Pérez, E et al 2009, Carbon and oxygen isotope geochemistry of live (stained) benthic foraminifera from the Aleutian Margin and the Southern Australian Margin, Marine Micropaleontology, vol. 70, pp. 89-101. ...
TY - JOUR. T1 - Perspective on the response of marine calcifiers to global warming and ocean acidification-Behavior of corals and foraminifera in a high CO2 world hot house. AU - Kawahata, Hodaka. AU - Fujita, Kazuhiko. AU - Iguchi, Akira. AU - Inoue, Mayuri. AU - Iwasaki, Shinya. AU - Kuroyanagi, Azumi. AU - Maeda, Ayumi. AU - Manaka, Takuya. AU - Moriya, Kazuyoshi. AU - Takagi, Haruka. AU - Toyofuku, Takashi. AU - Yoshimura, Toshihiro. AU - Suzuki, Atsushi. PY - 2019/12/1. Y1 - 2019/12/1. N2 - The CO2 concentration of air has increased over the last two centuries and recently surpassed 400 ppm. Carbon cycle models project CO2 concentrations of 720 to 1000 ppm for the IPCC intermediate scenario (RCP 6.0), resulting in an increase in global mean temperature of ~ 2.6 °C and a decrease in seawater pH of ~ 0.3. Together, global warming and ocean acidification are often referred to as the evil twins of climate change, potentially inducing severe threats in the near future. In this paper, our ...
François Fourel, Francois Martineau, Emoke Toth, Agnes Görög, Gilles Escarguel, et al.. Carbon and oxygen isotope variability among foraminifera and ostracod carbonated shells. Physica, 2015, 70, pp.133-156. ⟨10.17951/aaa.2015.70.133⟩. ⟨hal-02334191⟩ ...
A large monothalamous foraminiferan, Toxisarcon taimyr sp. nov., has been isolated from the benthic samples from the Kara Sea inner shelf near the mouth of
ABSTRACT. Xenophyophorea are giant deep-sea rhizopodial protists of enigmatic origins. Although species were described as Foraminifera or sponges in the early literature, the xenophyophoreans are currently classified either as a class of Rhizopoda or an independent phylum. To establish the phylogenetic position of Xenophyophorea, we analysed the small subunit (SSU) rRNA gene sequence of Syringammina corbicula Richardson, a newly described xenophyophorean species from the Cape Verde Plateau. The SSUrDNA analyses showed that S. corbicula is closely related to Rhizammina algaeformis, a tubular deep-sea foraminiferan. Both species branch within a group of monothalamous (single-chambered) Foraminifera, which include also such agglutinated genera as Toxisarcon, Rhabdammina, and Saccammina, and the organic-walled genera Gloiogullmia and Cylindrogullmia. Our results are congruent with observations of similar cytoplasmic organisation in Rhizammina and Syringammina. Thus, the Xenophyophorea appear to be a ...
Figure 2. Carbon dioxide concentrations in the Vostok ice core from Antarctica (Barnola et al., 1987; Jouzel et al., 1993; solid triangles), compared with a productivity-related carbon isotope signal from the eastern tropical Pacific (difference between the delta13C values of planktonic and benthic foraminifera; Shackleton et al., 1983; heavy line), show that ocean productivity and atmospheric CO2 tend to vary together. Time scale of Barnola et al. is adjusted to the one of Shackleton et al. by correlation of the deuterium signal in the ice with the oxygen isotope signal in the sediment (from Berger et al., 1996).. ...
Two morphologically distinct species of free-swimming dinoflagellates belonging to the genus Gyrodinium utilize the spine and rhizopodial environments of planktonic foraminifera and colonial radiolaria as microhabitats. Up to 84% of the sarcodines examined in a given population were associated with these dinoflagellates at densities up to 20,000 cells per sarcodine in some radiolarian colonies. Both dinoflagellate species possess chloroplasts, indicating they are capable of autotrophy. C-14-labelling experiments with the radiolarian-associated dinoflagellate demonstrate that it can take up inorganic carbon under both light and dark conditions. Ultrastructural evidence suggests the foraminiferal dinoflagellate may be capable of phagotrophy. Hence, these algae should be considered mixotrophs. An unusual cytoplasmic extension used for attachment and possibly feeding occurs in the foraminiferal-associated Gyrodinium and is documented with electron microscopy. Ultrastructural examination suggests ...
The work presented in this dissertation focuses on the paleoceanography of the Indonesian Seas over the past 25,000 years; a region that plays a critical role in the global atmospheric and oceanic circulation. The modern oceanography of the Indonesian Seas is very complex due to the combined impact of the East Asian Monsoon, the Australian Monsoon, the migration of the Inter-Tropical Convergence Zone (ITCZ) and the El Niño Southern Oscillation, which is reflected in sea surface temperature (SST) and salinity (SSS) changes in this region on both intra- and interannual timescales. ❧ Therefore, in order to explore the impacts of these various climate systems on the paleoceanography of the Indonesian Seas, unbiased estimates of past SST/SSS are needed. One of the most common technique to infer past changes in SST is the measurement of Mg/Ca in the planktonic foraminifer Globigeriniodes ruber (white). When combined with the stable oxygen isotope (δ¹⁸O) measurements on the same foraminiferal ...
The paper concerns a microfauna of well-preserved radiolarians, foraminifers, and conodonts discovered in unusually large concretions occurring in black shale. The microfossils are recovered by dissolving pieces of the concretions in a diluted solution of formic acid. The assemblage is unusual because radiolarians of this age are very scarce and also because the microfossils occur in strata deposited on the near shore margin of the epicontinental interior sea present in Pennsylvanian time. Present day radiolarians are floating organisms that are found mostly in the upper part of the open ocean far from shore. Their tiny siliceous remains are very abundant in ocean bottom deposits at great depths. ...
The skeletal plates and teeth of the echinoid Paracentrotus lividus contain a heterogeneous assemblage of macromolecules that are not part of the connective tissue, but are presumably intimately associated with the mineral phase. Upon dissolution of the Mg-calcite mineral phase, some of these molecules are insoluble. The insoluble fractions of the teeth and skeletal plates are quite different, the former being predominantly protein and the latter, primarily some unknown nonproteinaceous material. The soluble constituents are similar in both tissues. These hydrophilic macromolecules have been partially separated and characterized. In both hard parts, two distinct classes of macromolecules are present, as indicated by the amino acid compositions of their protein constituents. These two classes of macromolecules are also present in the shells of a foraminifer and in various mollusks, both of which are formed by the organic matrix-mediated biomineralization process. The locations of these ...
The Rhizaria are a species-rich supergroup of mostly unicellular[1] eukaryotes.[2] Except from the Chlorarachniophyte and three species in the genus Paulinella in the phylum Cercozoa, they are all non-photosyntethic, but many foraminifers have a symbiotic relationship with unicellular algae. A multicellular form, Guttulinopsis vulgaris, a cellular slime mold, has also been described.[3] This supergroup was proposed by Cavalier-Smith in 2002. Being described mainly from rDNA sequences, they vary considerably in form, having no clear morphological distinctive characters (synapomorphies), but for the most part they are amoeboids with filose, reticulose, or microtubule-supported pseudopods. Many produce shells or skeletons, which may be quite complex in structure, and these make up the vast majority of protozoan fossils. Nearly all have mitochondria with tubular cristae. ...
Ramakrishnan, S; Asady, S; Docampo, R. Acidocalcisome-Mitochondrion Membrane Contact Sites in Trypanosoma brucei. Pathogens (2018), 7(2), 33; doi:3390/pathogens7020033. Goldstein, ST; Richardson, EA. Fine structure of the foraminifer Hyanesina germanica (Ehrenberg) and its sequestered chloroplasts. Marine Micropaleontology (2018) 138: 63-71.. Cordeiro, CD; Saiardi, A; Docampo, R The inositol pyrophosphate synthesis pathway in Trypanosoma brucei is linked to polyphosphate synthesis in acidocalcisomes. Molecular Microbiology (2017) doi: 10.1111/mmi.13766. Taylor-Mulneix DL, Bendor L, Linz B, Rivera I, Ryman VE, Dewan KK, Wagner, SM; Wilson, EF; Hilburger, LJ; Cuff, LE; West, CM; Harvill, ET. Bordetella bronchisepticaexploits the complex life cycle of Dictyostelium discoideum as an amplifying transmission vector. PLoS Biol (2017) 15(4): e2000420.. Malmberg, JL; Howerth, EW; Powers, BE; Schaffer, PA Acanthomatous Ameloblastoma with Atypical Foci in Five Dogs. Vet. Diagnostic Investigation. ...
At the end of the last Ice Age, as the world began to warm, a swath of the North Pacific Ocean came to life. During a brief pulse of biological productivity 14,000 years ago, this stretch of the sea teemed with phytoplankton, amoeba-like foraminifera and other tiny creatures, who thrived in large numbers until the productivity ended -- as mysteriously as it began -- just a few hundred years later.
Understanding the changes in, and drivers of, isotopic variability of sulfur in seawater sulfate (δ34SSO4-sw) over geological time remains a long-standing goal, particularly because of the coupling between the biogeochemical sulfur and carbon cycles. The early Cenozoic has remained enigmatic in this regard, as the existing seawater sulfate isotopic records appear to be decoupled from the well-defined carbon isotope composition of the ocean. Here, we present a new Cenozoic record of sulfur isotopes, using carbonate-associated sulfate hosted in the calcite lattice of single-species foraminifera. The vastly improved stratigraphy afforded by this record demonstrates that carbon and sulfur cycles, as recorded by their isotopes, are not fully decoupled in the early Cenozoic. With a model driven by partial coupling of the carbon and sulfur cycles, we demonstrate that a change in sulfur isotopic fractionation of the pyrite burial flux best explains the large increase in δ34SSO4-sw ~53 million years ago (Ma)
Despite being the objects of numerous macroevolutionary studies, many of the best represented constituents of the fossil record-including diverse examples such as foraminifera, brachiopods, and mollusks-have mineralized skeletons with limited discrete characteristics, making morphological phylogenies difficult to construct. In contrast to their paucity of phylogenetic characters, the mineralized structures (tests and shells) of these fossil groups frequently have distinctive shapes that have long proved useful for their classification. The recent introduction of methodologies for including continuous data directly in a phylogenetic analysis has increased the number of available characters, making it possible to produce phylogenies based, in whole or part, on continuous character data collected from such taxa. Geometric morphometric methods provide tools for accurately characterizing shape variation and can produce quantitative data that can therefore now be included in a phylogenetic matrix in a ...
The closest relatives of Cercozoa are the Retaria (Foraminifera and Radiozoa; Cavalier-Smith 1999). Radiozoa are all marine unicellular organisms with microtubule-supported axopodia; they comprise the classical polycystine Radiolaria (with silica skeletons), the Acantharea (with strontium sulphate skeletons), which both also possess axopodia, and the curious floating and axopodially swimming Sticholonche which is not mineralized. Radiozoa now excludes the Phaeodarea, which despite their silica skeleton and axopodia, clearly belong in Cercozoa. Phaeodarea appear to be related to the filosan group known as Thecofilosea, which includes filose testate amoebae without silica scales and also the exclusively marine ebriid flagellates, which like the Phaeodarea have a hollow silica endoskeleton, which might therefore have been a common ancestral character for both groups. A hollow silica endoskeleton is unknown in any other eukaryotes. Two groups of Cercozoa (the euglyphid testate amoebae and the ...
Kleptoplasty is a symbiotic relationship between an algae and a host organism. The algae ingested and digested by the host and the chlorophyll containing plastids retain their photosynthetic capabilities with the host. Most of these hosts are single cell organisms such as Dinoflagellates, Ciliates, and Foraminifera. There is at least one multicellular animal that also…
A calibration curve is used by taking the radiocarbon date reported by a laboratory and reading across from that date on the vertical axis of the graph. The point where this horizontal line intersects the curve will give the calendar age of the sample on the horizontal axis. This is the reverse of the way the curve is constructed: a point on the graph is derived from a sample of known age, such as a tree ring; when it is tested, the resulting radiocarbon age gives a data point for the graph.. Over the next thirty years many calibration curves were published using a variety of methods and statistical approaches. The improvements to these curves are based on new data gathered from tree rings, varvescoralplant macrofossilsspeleothemsand foraminifera.. The INTCAL13 data includes separate curves for the northern and southern hemispheres, as they differ systematically because of the hemisphere effect. The southern curve SHCAL13 is based on independent data where possible and derived from the northern ...
Spirulina may refer to: Spirulina (dietary supplement), a cyanobacterium that can be consumed by humans and other animals Arthrospira, a spirulina genus of cyanobacteria Spirulina (genus), a cyanobacterium group Ochthephila spirulina, species of gastropod in the Hygromiidae family Spirulina (suborder), a group of cephalopods Spirula, the only extant member of that suborder Spiralinella, a genus of very small sea snails, pyramidellid gastropod mollusks, or micromollusks Spirolina, is a genus of foraminifera in the family ...
Serpula [mixed Mollusca, Annelida and Foraminifera]* (5 species). * four genera comprised of more than one phylum but including Mollusca. Among the 39 molluscan genera (including the four heterogeneous ones) introduced in the Tenth edition are: one in Class Scaphopoda, one in Polyplacophora, three in Cephalopoda, 14 in Pelecypoda, and 20 in Gastropoda. Although the majority of his molluscan genera are unambiguous, many of the 683 constituent molluscan species-level taxa in this work required the attention of later taxonomists for clarification. An example of that sort of analysis is the work of Henry Dodge (1952-1959; 517 species in bold above; see bibliography), who, like many predecessors, dealt with the fact that the Systema Naturae was not illustrated, that his descriptions were often insufficient, and that he cited earlier iconographies in which the figures not always artistically accurate. A particularly frustrating problem with the use of these indications was that under a single Linnaean ...
Wild ruminants may differ in their protozoal fauna according to their feeding type, but a comprehensive evaluation of available data is lacking. Here, we evaluate the literature data available on the protozoal fauna (diversity, concentration and proportions of the major groups including Entodiniinae, Diplodiniinae and Isotrichidae) in relation to the natural diet (as percentage of grass in the natural diet, %grass) and body mass (BM) in 55 wild ruminant species. The effects of ruminant phylogeny were controlled for using phylogenies based on molecular data and phylogenetic generalized least-squares. Transferring results from domestic to wild ruminants, we hypothesized (1) a decrease in the proportion of Entodiniinae and an increase in that of Diplodiinae, with %grass in the natural diet; (2) a positive correlation between Diplodiinae and Isotrichidae; (3) no influence of BM on these protozoal groups. Based on the literature statements, we additionally expected that (4) protozoa diversity ...
Eyewitness accounts of galloping glaciers seem to substantiate the claim that the surge begins high up on a glacier and then pushes down-valley in a wave. As the brittle upper surface of the glacier buckles violently, it apparently generates a deafening noise. Some people have described loud rumblings and snapping sounds; others have mistaken the sounds for earthquake tremors.. Positive evidence exists for ice surges on a far grander scale in the past. Deep sea cores from the North Atlantic reveal a highly irregular glacial record during the post-Flood Ice Age. Rather than regular and steady sediment accumulation, the core evidence points to large pulses of ice-rafted debris that accumulated suddenly. Marine sediments directly overlying these debris concentrations reveal a peculiar freshwater signature, leading to the interpretation that vast bodies of ice-melt suddenly freshened the oceans on the heels of major surges of continent-scale ice sheets.. Called Heinrich events (after marine ...
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Thiobios (sulfide-dependent) meiofauna have an aerobic metabolism, are sulfide-insensitive and rarely contain symbiotic sulfur-oxidizing bacteria. Adaptations so far observed in thiobios are consistent with the overriding need to maximize the diffusive flux of oxygen and sulfide to optimize energy yield. Both accrue from the requirement that oxygen and sulfide uptake and metabolism be controlled by diffusion and first-order rate reactions. These adaptations include variation in shape, mitochondrial distribution and respiratory capacity. Meiofauna can substantially supplement a more inefficient anaerobic metabolism with aerobic metabolism at oxygen concentrations as low as 0.1 M. Hence, an aerobic capacity is useful even in thiobios. Adaptation to low oxygen, by decreasing metabolic rate, is counterproductive unless oxygen consumption remains zero-order. Otherwise, aerobic metabolic capacity must be increased to maximize oxygen flux. Sulfide-insensitivity is necessary because a sulfide ...
Light does not reach the deep-sea floor. This precludes photosynthesis and thus primary production (except in chemosynthetic communities like hydrothermal vents
The number of icebergs produced from ice-shelf disintegration has increased over the past decade in Antarctica. These drifting icebergs mix the water column, influence stratification and nutrient condition, and can affect local productivity and food web composition. Data on whether icebergs affect bacterioplankton function and composition are scarce, however. We assessed the influence of iceberg drift on bacterial community composition and on their ability to exploit carbon substrates during summer in the coastal Southern Ocean. An elevated bacterial production and a different community composition were observed in iceberg-influenced waters relative to the undisturbed water column nearby. These major differences were confirmed in short-term incubations with bromodeoxyuridine followed by CARD-FISH. Furthermore, one-week bottle incubations amended with inorganic nutrients and carbon substrates (a mix of substrates, glutamine, N-acetylglucosamine, or pyruvate) revealed contrasting capacity of ...
ORCID: https://orcid.org/0000-0001-8370-289X; Assmann, Karen M.; Whitt, Daniel B.; Van Wessem, Melchoir; van de Berg, Willem Jan; Reijmer, Carleen H.; Dutrieux, Pierre. 2017 Oceanographic Controls on the Variability of Ice-Shelf Basal Melting and Circulation of Glacial Meltwater in the Amundsen Sea Embayment, Antarctica. Journal of Geophysical Research: Oceans, 122 (12). 10131-10155. https://doi.org/10.1002/2017JC012926 Snow, K.; Goldberg, D.N.; Holland, Paul R. ...
Carl Heinrich SCHULZ was the 5th child and only son of Johann Heinrich SCHULZ a farmer and wife Johanna Caroline nee KRANZ. He was born on the 3rd of May 1877 at their farm 8 km N/E of Murtoa.
A tongue in cheek list of ideas I have for things I could do when I retire: Develop a drug habit Adopt a permanent pants-free lifestyle Start wearing suspenders Have enough time to figure out how to lick my own elbows Garden Paint the town... blue Adopt a dolphin Stand at Cape Agulhas Make really good…
La biologjie e je la sience che studie la vite in dutis lis sôs formis. Il non biologjie al è stât inventât tal XVIII secul dal studiôs francês Jean-Baptiste Pierre Antoine de Monet, cavalîr di Lamarck. Va dite che nol è simpri facil distingui fra organisims vivents e no vivents (par esempli i virus), par chest logjet de biologjie nol è che al sedi simpri clarementri identificât. Cuant che si studiin lis molecolis, lis celulis e i organisims microscopics la biologjie e à a ce fâ cu la fisiche e cu la chimiche e i confins fra chestis siencis no son nets. ...
LFrom tba Jacksoa Star.l MayAVhite, of Stockbridge, isstill asleep, and has remained in that nocturnal sleep for ir weeks. Investigation of the case of the sleepj ing girl shows her peculiar malady is, in all probability, the result of a fall received about a year ago. At that time Miss White, who is 26 years old, not 15 as has been stated, was attending tic business college at Ypsilanti. One evening while descending some stone steps she slipped and feil, striking heavily on one side. The resulting contusión gave her great pain and she was obliged to leave school, returning to her home in Meadville. Eventually an abcess rormed where Miss White sustained the injury. She grew worse right alor g and began to have spasms at frequent intervals. Dr. H. E. Brown, of Stockbridge, treated her and in time the malády seeraed to succumb to his efforts. The spasms ceased and the abcess was relieved. About eleven weeks ago the proneness to sleep developed. Dr. Brown was puzzled and to facilítate matters ...
La biologjie e je la sience che studie la vite in dutis lis sôs formis. Il non biologjie al è stât inventât tal XVIII secul dal studiôs francês Jean-Baptiste Pierre Antoine de Monet, cavalîr di Lamarck. Va dite che nol è simpri facil distingui fra organisims vivents e no vivents (par esempli i virus), par chest logjet de biologjie nol è che al sedi simpri clarementri identificât. Cuant che si studiin lis molecolis, lis celulis e i organisims microscopics la biologjie e à a ce fâ cu la fisiche e cu la chimiche e i confins fra chestis siencis no son nets. ...
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By creating an account, youre agreeing to our Terms of Use, Privacy Policy and to receive emails from Spiceworks. What is the difference between a point transformation and a vector transformation? Watch QueueQueueWatch QueueQueue Remove allDisconnect The next video is startingstop Loading... O como? 8augusto8 Hace más de 5 años 0 deathbresso dijo:Te sale un cartel? Who created the Secret Stairs as a way into Mordor and for what purpose? Which Puranic Scriptures describes procedure of Ashtanga Yoga? Yfz6s2: [Ayuda] que procesador comprar? TechnologyMadeBasic 915,655 views 9:55 COMO REPARAR EL ERROR DE WINDOWS UPDATE FACIL Y EFECTIVO (TODAS LAS VERSIONES WINDOWS) - Duration: 9:07. How I Solve 310,435 views 10:14 How to Fix Windows Update Errors - Duration: 9:55. mohsin Siddique 5,778 views 1:02 Windows 7 Service Pack 1 Wont Install - Duration: 1:28. run the installer as admin.. serubi 79,072 views 2:19 Como resolver todos os erros do Windows Update - Duration: 10:47. Autoplay When autoplay ...
Immigration Realmente contestaron las preguntas que tenia referente a mi caso de Inmigracion, yo podria recomendar el servicio a conocidos por su amabilidad y por la rapidez del servicio. Por ultimo, me gustaria comentar que el lugar esta centrico y de facil acceso ...
Augenarztpraxis Stefan Heinrich in Berlin-Charlottenburg am Savignyplatz - die Spezialisten für die Behandlung von: Grauer Star, Grüner Star, Katarakt, Makuladegeneration, Tränensäcke, Netzhautablösung, Schielen, Glaukom, Schlupflider. Außerdem: Augen Lasern Operation, Sehschule, Augenlidkorrektur, Kontaktlinsen
Prof Heinrich Heimann is a specialist consultant at Spire Murrayfield Hospital, Wirral. Get in touch now for expert advice and treatments provided at Spire Healthcare.
Michael Heinrich Ziegelmeyer: current contact information and listing of economic research of this author provided by RePEc/IDEAS
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Norges største realfaglige forskning- og utdanningsinstitusjon. Astrofysikk, biologi, farmasi, fysikk, geologi, informatikk, kjemi, matematikk, molekylær biovitenskap og teknologi.