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Articles 2011 - 2040 of 2985
Full-Text Articles in Entire DC Network
Class Type Separation Of The Polar And Apolar Components Of Petroleum, William J. Robson, Paul A. Sutton, Paul Mccormack, Neil P. Chilcott, Steven J. Rowland
Class Type Separation Of The Polar And Apolar Components Of Petroleum, William J. Robson, Paul A. Sutton, Paul Mccormack, Neil P. Chilcott, Steven J. Rowland
School of Geography, Earth and Environmental Sciences
Identification of the heteroatom (nitrogen, sulfur, and oxygen)-containing compounds of petroleum is of key importance when considering industrial and environmental issues associated with crude oil production. The more commonly performed methods of crude oil fractionation are often insufficient in the extent to which they separate oils, not allowing defined “molecular” fractions to be obtained. Methods capable of performing a class type separation are uncommon and are often extensive and resource and time intensive. Here we report a method for the separation of crude oils into discrete compound classes. The method utilizes both ion exchange and normal phase chromatography to generate …
Particulate Phases Are Key In Controlling Dissolved Iron Concentrations In The (Sub)Tropical North Atlantic, Angela Milne, Christian Schlosser, Bronwyn D. Wake, Eric P. Achterberg, Rosie Chance, Alex R. Baker, Alex Forryan, Maeve C. Lohan
Particulate Phases Are Key In Controlling Dissolved Iron Concentrations In The (Sub)Tropical North Atlantic, Angela Milne, Christian Schlosser, Bronwyn D. Wake, Eric P. Achterberg, Rosie Chance, Alex R. Baker, Alex Forryan, Maeve C. Lohan
School of Geography, Earth and Environmental Sciences
No abstract provided.
Examining Student's Night-Time Activity Spaces: Identities, Performances And Transformations, Mark Holton
Examining Student's Night-Time Activity Spaces: Identities, Performances And Transformations, Mark Holton
School of Geography, Earth and Environmental Sciences
No abstract provided.
Biomarker-Based H-Print Quantifies The Composition Of Mixed Sympagic And Pelagic Algae Consumed By Artemia Sp., Thomas A. Brown, Simon T. Belt
Biomarker-Based H-Print Quantifies The Composition Of Mixed Sympagic And Pelagic Algae Consumed By Artemia Sp., Thomas A. Brown, Simon T. Belt
School of Geography, Earth and Environmental Sciences
No abstract provided.
Creep Of Mafic Dykes Infiltrated By Melt In The Lower Continental Crust (Seiland Igneous Province, Norway), Alessandrini G Degli, L. Menegon, N. Malaspina, A. H. Dijkstra, M. W. Anderson
Creep Of Mafic Dykes Infiltrated By Melt In The Lower Continental Crust (Seiland Igneous Province, Norway), Alessandrini G Degli, L. Menegon, N. Malaspina, A. H. Dijkstra, M. W. Anderson
School of Geography, Earth and Environmental Sciences
No abstract provided.
Climate, Agroecology And Socio-Economic Determinants Of Food Availability From Agriculture In Bangladesh, (1948–2008), S Rahman
School of Geography, Earth and Environmental Sciences
The paper examines the impacts of prices, resources, technology, education, public investments, climatic variables and agroecology on Food Availability (FA) from domestic agriculture in Bangladesh using a panel data of 17 regions covering a 61-year period (1948–2008) by utilising a dynamic agricultural supply response framework and Generalised Methods of Moments (GMM) estimator. Results revealed that FA has increased at the rate of 1.32% p.a. with significant regional variations. Significant regional differences exist with respect to climatic variables, resources, Green Revolution (GR) technology and education. Among the output prices, rise in the prices of rice, vegetables and pulses significantly increase FA …
Drivers Of Production And Efficiency Of Onion Cultivation In Bangladesh, Ar Anik, Ma Salam, S Rahman
Drivers Of Production And Efficiency Of Onion Cultivation In Bangladesh, Ar Anik, Ma Salam, S Rahman
School of Geography, Earth and Environmental Sciences
The study identifies the drivers of production and technical efficiency in onion cultivation based on a survey of 300 farmers from three different major onion growing districts in Bangladesh by applying a stochastic production frontier approach. Results reveal that land is the most important driver of production (elasticity value 0.33) followed by labour (0.24) and seed (0.18). Use of modern seed significantly improves production. A constant returns to scale exists in onion production. The mean technical efficiency is estimated at 67% implying that output can be increased substantially by 49% by eliminating inefficiencies in production. Extension contact, use of recommended …
Stability Of Dissolved And Soluble Fe(Ii) In Shelf Sediment Pore Waters And Release To An Oxic Water Column, Jk Klar, Wb Homoky, Pj Statham, Aj Birchill, Et Al
Stability Of Dissolved And Soluble Fe(Ii) In Shelf Sediment Pore Waters And Release To An Oxic Water Column, Jk Klar, Wb Homoky, Pj Statham, Aj Birchill, Et Al
School of Geography, Earth and Environmental Sciences
Shelf sediments underlying temperate and oxic waters of the Celtic Sea (NW European Shelf) were found to have shallow oxygen penetrations depths from late spring to late summer (2.2-5.8 mm below seafloor) with the shallowest during/after the spring-bloom (mid-April to mid-May) when the organic carbon content was highest. Sediment porewater dissolved iron (dFe, <0.15 µm) mainly (>85%) consisted of Fe(II) and gradually increased from 0.4 to 15 µM at the sediment surface to ~100-170 µM at about 6 cm depth. During the late spring this Fe(II) was found to be mainly present as soluble Fe(II) (>85% sFe, <0.02 µm). Sub-surface dFe(II) maxima were enriched in light isotopes (d56Fe -2.0 to -1.5‰), which is attributed to dissimilatory iron reduction (DIR) during the bacterial decomposition of organic matter. As porewater Fe(II) was oxidised to insoluble Fe(III) in the surface sediment layer, residual Fe(II) was further enriched in light isotopes (down to -3.0‰). Ferrozine-reactive Fe(II) was found in surface porewaters and in overlying core top waters, and was highest in the late spring period. Shipboard experiments showed that depletion of bottom water oxygen in late spring can lead to a substantial release of Fe(II). Reoxygenation of bottom water caused this Fe(II) to be rapidly lost from solution, but residual dFe(II) and dFe(III) remained (12 and 33 nM) after >7 h. Iron(II) oxidation experiments …
Reciprocal Elucidation: A Student-Led Pedagogy In Multidisciplinary Undergraduate Research Conferences, H Walkington, J Hill, Pe Kneale
Reciprocal Elucidation: A Student-Led Pedagogy In Multidisciplinary Undergraduate Research Conferences, H Walkington, J Hill, Pe Kneale
School of Geography, Earth and Environmental Sciences
There is no previous study of the benefits of attending a national multidisciplinary conference dedicated to undergraduate researchers, despite the growing number of such conferences internationally. This paper addresses the gap in knowledge of the learning gains from these conferences, and reveals a student driven learning process, a multidisciplinary signature pedagogy. It presents the results of 90 in-depth interviews with student conference participants conducted over three consecutive years of a multidisciplinary National Conference of Undergraduate Research (2012–2014). This paper uniquely captures the student voice on their perceived learning gains from this experience. The results reveal that some students co-create a …
The Role Of Organizational Vision In Guiding Idea Generation Within Sme Contexts, Graham Perkins, Jonathan Lean, Robert Newbery
The Role Of Organizational Vision In Guiding Idea Generation Within Sme Contexts, Graham Perkins, Jonathan Lean, Robert Newbery
Plymouth Business School
No abstract provided.
Chromatographic And Spectral Studies Of Jetsam And Archived Ambergris, Steven J. Rowland, Paul A. Sutton
Chromatographic And Spectral Studies Of Jetsam And Archived Ambergris, Steven J. Rowland, Paul A. Sutton
More Faculty of Science and Engineering Research
We describe determination of the dichloromethane-soluble components of 12 samples of the natural product, ambergris, using capillary gas chromatography-mass spectrometry (GC-MS). Ambergris is produced in vivo in about 1% of Sperm whales and is used in perfumery and for odour fixation. Whilst descriptions of ambergris chemistry appeared until about 40 years ago, few accounts of analyses of whole extracts of multiple samples of ambergris by GC-MS have been published before. As expected, our analyses revealed that the major component (up to 97% of the dichloromethane-soluble material) was ambrein, with co-occurring, variable proportions of steroids. Moreover, we report apparently for the …
Factors Affecting The Prevalence Of The Trematode Parasite Echinostephilla Patellae (Lebour, 1911) In The Limpet Patella Vulgata (L.), Louise B. Firth, Lisa M. Grant, Tasman P. Crowe, Jonathan S. Ellis, Christena Wiler, Christopher Convery, Nessa E. O'Connor
Factors Affecting The Prevalence Of The Trematode Parasite Echinostephilla Patellae (Lebour, 1911) In The Limpet Patella Vulgata (L.), Louise B. Firth, Lisa M. Grant, Tasman P. Crowe, Jonathan S. Ellis, Christena Wiler, Christopher Convery, Nessa E. O'Connor
School of Biological and Marine Sciences
Parasites are ubiquitous throughout nature and can have dramatic effects on their hosts. Although much is known about the pathology of parasites, the environmental factors influencing the distribution and abundance of parasites are poorly understood. Investigations into these factors could help predict the effect of parasites on the functioning of ecosystems. The limpet Patella vulgata is a key grazer on European rocky shores and is the first intermediate host for the trematode parasite, Echinostephilla patellae. This study investigated the spatial distribution of E. patellae in relation to P. vulgata at fourteen rocky shores around Ireland. Despite P. vulgata recruiting into …
School Gardens And The School Food Plan: Contributing To A Culture Of Healthy Living, A Page, M Bremner, R Passy
School Gardens And The School Food Plan: Contributing To A Culture Of Healthy Living, A Page, M Bremner, R Passy
Plymouth Institute of Education
Significantly revised and updated the second edition now includes 7 brand new chapters on: · Methods of Assessment and Evaluation · Global perspectives on Outdoor Learning · Developing whole school approaches to indoor and outdoor ...
Successional Changes Of Epibiont Fouling Communities Of The Cultivated Kelp Alaria Esculenta: Predictability And Influences, Am Walls, Md Edwards, Lb Firth, Mp Johnson
Successional Changes Of Epibiont Fouling Communities Of The Cultivated Kelp Alaria Esculenta: Predictability And Influences, Am Walls, Md Edwards, Lb Firth, Mp Johnson
School of Geography, Earth and Environmental Sciences
There has been an increase in commercial-scale kelp cultivation in Europe, with fouling of cultivated kelp fronds presenting a major challenge to the growth and development of the industry. The presence of epibionts decreases productivity and impacts the commercial value of the crop. Several abiotic and biotic factors may influence the occurrence and degree of fouling of wild and cultivated fronds. Using a commercial kelp farm on the SW coast of Ireland, we studied the development of fouling communities on cultivated Alaria esculenta fronds over 2 typical growing seasons. The predictability of community development was assessed by comparing mean occurrence-day. …
“It Was Amazing To See Our Projects Come To Life!” Developing Affective Learning During Geography Fieldwork Through Tropophilia, Mark Holton
School of Geography, Earth and Environmental Sciences
No abstract provided.
Social Memory And The Resilience Of Communities Affected By Land Degradation, Geoff A. Wilson, Claire L. Kelly, Helen Briassoulis, Agostino Ferrara, Gianni Quaranta, Rosanna Salvia, Vassilis Detsis, Michiel Curfs, Artemio Cerda, Ahmed El-Aich, Honghu Liu, Costas Kosmas, Concepción L. Alados, Anton Imeson, Ruta Landgrebe-Trinkunaite, Luca Salvati, Sandra Naumann, Hu Danwen, Theodoros Iosifides, Thanassis Kizos, Giuseppe Mancino, Angelo Nolè, Min Jiang, Pingcang Zhang
Social Memory And The Resilience Of Communities Affected By Land Degradation, Geoff A. Wilson, Claire L. Kelly, Helen Briassoulis, Agostino Ferrara, Gianni Quaranta, Rosanna Salvia, Vassilis Detsis, Michiel Curfs, Artemio Cerda, Ahmed El-Aich, Honghu Liu, Costas Kosmas, Concepción L. Alados, Anton Imeson, Ruta Landgrebe-Trinkunaite, Luca Salvati, Sandra Naumann, Hu Danwen, Theodoros Iosifides, Thanassis Kizos, Giuseppe Mancino, Angelo Nolè, Min Jiang, Pingcang Zhang
School of Geography, Earth and Environmental Sciences
Based on evidence collected in 22 village communities from nine study sites situated in Spain, Italy, Greece, Morocco and China, this study analyses the complex interlinkages between social memory, community resilience and land degradation. Social memory is seen as an important explanation regarding the ability of a local community to manage and cope with land degradation. Emphasis is placed on the importance of three components of social memory—rites, traditions and social learning processes—for shaping community resilience in coping with land degradation processes. The study argues that although there are subtle differences between the 22 village communities, the loss of social …
A Substantial Fraction Of Phytoplankton-Derived Don Is Resistant To Degradation By A Metabolically Versatile, Widely Distributed Marine Bacterium, L Polimene, D Clark, S Kimmance, P Mccormack
A Substantial Fraction Of Phytoplankton-Derived Don Is Resistant To Degradation By A Metabolically Versatile, Widely Distributed Marine Bacterium, L Polimene, D Clark, S Kimmance, P Mccormack
School of Geography, Earth and Environmental Sciences
The capacity of bacteria for degrading dissolved organic nitrogen (DON) and remineralising ammonium is of importance for marine ecosystems, as nitrogen availability frequently limits productivity. Here, we assess the capacity of a widely distributed and metabolically versatile marine bacterium to degrade phytoplankton-derived dissolved organic carbon (DOC) and nitrogen. To achieve this, we lysed exponentially growing diatoms and used the derived dissolved organic matter (DOM) to support an axenic culture of Alteromonas sp.. Bacterial biomass (as particulate carbon and nitrogen) was monitored for 70 days while growth dynamics (cell count), DOM (DOC, DON) and dissolved nutrient concentrations were monitored for up …
Subsequent Biotic Crises Delayed Marine Recovery Following The Late Permian Mass Extinction Event In Northern Italy, William J. Foster, Silvia Danise, Gregory D. Price, Richard J. Twitchett
Subsequent Biotic Crises Delayed Marine Recovery Following The Late Permian Mass Extinction Event In Northern Italy, William J. Foster, Silvia Danise, Gregory D. Price, Richard J. Twitchett
School of Geography, Earth and Environmental Sciences
No abstract provided.
The Cold Climate Geomorphology Of The Eastern Cape Drakensberg: A Reevaluation Of Past Climatic Conditions During The Last Glacial Cycle In Southern Africa, S. C. Mills, T. T. Barrows, M. W. Telfer, L. K. Fifield
The Cold Climate Geomorphology Of The Eastern Cape Drakensberg: A Reevaluation Of Past Climatic Conditions During The Last Glacial Cycle In Southern Africa, S. C. Mills, T. T. Barrows, M. W. Telfer, L. K. Fifield
School of Geography, Earth and Environmental Sciences
No abstract provided.
Faunal Response To Sea-Level And Climate Change In A Short-Lived Seaway: Jurassic Of The Western Interior, Usa, S Danise, Sm Holland
Faunal Response To Sea-Level And Climate Change In A Short-Lived Seaway: Jurassic Of The Western Interior, Usa, S Danise, Sm Holland
School of Geography, Earth and Environmental Sciences
Understanding how regional ecosystems respond to sea-level and environmental perturbations is a main challenge in palaeoecology. Here we use quantitative abundance estimates, integrated within a sequence stratigraphic and environmental framework, to reconstruct benthic community changes through the 13 myr history of the Jurassic Sundance Seaway in the western United States. Sundance Seaway communities are notable for their low richness and high dominance relative to most areas globally in the Jurassic, and this probably reflects steep temperature and salinity gradients along the 2000 km length of the Seaway that hindered colonization of species from the open ocean. Ordination of samples shows …
A Place For Sharing: The Emotional Geographies Of Peer-Sharing In Uk University Halls Of Residences, Mark Holton
A Place For Sharing: The Emotional Geographies Of Peer-Sharing In Uk University Halls Of Residences, Mark Holton
School of Geography, Earth and Environmental Sciences
No abstract provided.
The Cinderella Of Academia: Is Higher Education Pedagogic Research Undervalued In Uk Research Assessment?, Dre Cotton, W Miller, P Kneale
The Cinderella Of Academia: Is Higher Education Pedagogic Research Undervalued In Uk Research Assessment?, Dre Cotton, W Miller, P Kneale
Professional Services
Academic research is increasingly driven by research assessment exercises (in the UK, by the Research Excellence Framework, REF). These aim to compare outputs of researchers in each university with those elsewhere, but evaluation efforts have suffered from widespread criticism. The status of pedagogic research in higher education (HE)–once described as the ‘Cinderella’ of academia, but now an increasing part of university research activity–has also prompted some controversy. Both policy-makers and academics have raised questions about whether such research is appropriate for submission, and confusion exists over the distinction between pedagogic research and ‘scholarship of teaching and learning’. This project, funded …
The Application Of Geomorphic Indices In Terrain Analysis For Ground Engineering Practice, M. R. Geach, M. Stokes, A. Hart
The Application Of Geomorphic Indices In Terrain Analysis For Ground Engineering Practice, M. R. Geach, M. Stokes, A. Hart
School of Geography, Earth and Environmental Sciences
No abstract provided.
Combined Sea-Level And Climate Controls On Limestone Formation, Hiatuses And Ammonite Preservation In The Blue Lias Formation, South Britain (Uppermost Triassic – Lower Jurassic), Graham P Weedon, Hugh C Jenkyns, Kevin N Page
Combined Sea-Level And Climate Controls On Limestone Formation, Hiatuses And Ammonite Preservation In The Blue Lias Formation, South Britain (Uppermost Triassic – Lower Jurassic), Graham P Weedon, Hugh C Jenkyns, Kevin N Page
School of Geography, Earth and Environmental Sciences
Lithostratigraphic and magnetic-susceptibility logs for four sections in the Blue Lias Formation are combined with a re-assessment of the ammonite biostratigraphy. A Shaw plot correlating the West Somerset coast with the Devon/Dorset coast at Lyme Regis, based on 63 common biohorizon picks, together with field evidence, demonstrate that intra-formational hiatuses are common. Compared to laminated shale deposition, the climate associated with light marl is interpreted as both drier and stormier. Storm-related non-deposition favoured initiation of limestone formation near the sediment–water interface. Areas and time intervals with reduced water depths had lower net accumulation rates and developed a greater proportion of …
Predicting Copper Speciation In Estuarine Waters – Is Dissolved Organic Carbon A Good Proxy For The Presence Of Organic Ligands?, Holly B.C. Pearson, Sean D.W. Comber, Charlotte Braungardt, Paul J. Worsfold
Predicting Copper Speciation In Estuarine Waters – Is Dissolved Organic Carbon A Good Proxy For The Presence Of Organic Ligands?, Holly B.C. Pearson, Sean D.W. Comber, Charlotte Braungardt, Paul J. Worsfold
School of Geography, Earth and Environmental Sciences
No abstract provided.
Bulk-Carbonate And Belemnite Carbon-Isotope Records Across The Pliensbachian-Toarcian Boundary On The Northern Margin Of Gondwana (Issouka, Middle Atlas, Morocco), Fatima Zahra Ait-Itto, Gregory D. Price, Addi A Ait, Driss Chafiki, Imane Mannani
Bulk-Carbonate And Belemnite Carbon-Isotope Records Across The Pliensbachian-Toarcian Boundary On The Northern Margin Of Gondwana (Issouka, Middle Atlas, Morocco), Fatima Zahra Ait-Itto, Gregory D. Price, Addi A Ait, Driss Chafiki, Imane Mannani
School of Geography, Earth and Environmental Sciences
No abstract provided.
New Multiproxy Record Of The Jenkyns Event (Also Known As The Toarcian Oceanic Anoxic Event) From The Mecsek Mountains (Hungary): Differences, Duration And Drivers, Tamás Müller, Gregory D. Price, Dávid Bajnai, Anita Nyerges, Dóra Kesjár, Béla Raucsik, Andrea Varga, Katalin Judik, József Fekete, Zoltán May, József Pálfy
New Multiproxy Record Of The Jenkyns Event (Also Known As The Toarcian Oceanic Anoxic Event) From The Mecsek Mountains (Hungary): Differences, Duration And Drivers, Tamás Müller, Gregory D. Price, Dávid Bajnai, Anita Nyerges, Dóra Kesjár, Béla Raucsik, Andrea Varga, Katalin Judik, József Fekete, Zoltán May, József Pálfy
School of Geography, Earth and Environmental Sciences
No abstract provided.
The Database Of The Predicts (Projecting Responses Of Ecological Diversity In Changing Terrestrial Systems) Project, Lawrence N. Hudson, Tim Newbold, Sara Contu, Samantha L.L. Hill, Igor Lysenko, Palma A De, Helen R.P. Phillips, Tamera I. Alhusseini, Felicity E. Bedford, Dominic J. Bennett, Hollie Booth, Victoria J. Burton, Charlotte W.T. Chng, Argyrios Choimes, David L.P. Correia, Julie Day, Susy Echeverría-Londoño, Susan R. Emerson, Di Gao, Morgan Garon, Michelle L.K. Harrison, Daniel J. Ingram, M Jung, Victoria Kemp, Lucinda Kirkpatrick, Callum D. Martin, Yuan Pan, Gwilym D. Pask-Hale, Edwin L. Pynegar, An Robinson
The Database Of The Predicts (Projecting Responses Of Ecological Diversity In Changing Terrestrial Systems) Project, Lawrence N. Hudson, Tim Newbold, Sara Contu, Samantha L.L. Hill, Igor Lysenko, Palma A De, Helen R.P. Phillips, Tamera I. Alhusseini, Felicity E. Bedford, Dominic J. Bennett, Hollie Booth, Victoria J. Burton, Charlotte W.T. Chng, Argyrios Choimes, David L.P. Correia, Julie Day, Susy Echeverría-Londoño, Susan R. Emerson, Di Gao, Morgan Garon, Michelle L.K. Harrison, Daniel J. Ingram, M Jung, Victoria Kemp, Lucinda Kirkpatrick, Callum D. Martin, Yuan Pan, Gwilym D. Pask-Hale, Edwin L. Pynegar, An Robinson
School of Biological and Marine Sciences
No abstract provided.
Interplay Between Stress Permutations And Overpressure To Cause Strike-Slip Faulting During Tectonic Inversion, David C.P. Peacock, Enrico Tavarnelli, Mark W. Anderson
Interplay Between Stress Permutations And Overpressure To Cause Strike-Slip Faulting During Tectonic Inversion, David C.P. Peacock, Enrico Tavarnelli, Mark W. Anderson
School of Geography, Earth and Environmental Sciences
No abstract provided.
Microplastics Affect The Ecological Functioning Of An Important Biogenic Habitat., Ds Green, B Boots, Ne O'Connor, R Thompson
Microplastics Affect The Ecological Functioning Of An Important Biogenic Habitat., Ds Green, B Boots, Ne O'Connor, R Thompson
School of Biological and Marine Sciences
Biological effects of microplastics on the health of bivalves have been demonstrated elsewhere, but ecological impacts on the biodiversity and ecosystem functioning of bivalve-dominated habitats are unknown. Thus, we exposed intact sediment cores containing European flat oysters (Ostrea edulis) or blue mussels (Mytilus edulis) in seawater to two different densities (2.5 or 25 μg L(-1)) of biodegradable or conventional microplastics in outdoor mesocosms. We hypothesized that filtration rates of the bivalves, inorganic nitrogen cycling, primary productivity of sediment dwelling microphytobenthos, and the structure of invertebrate benthic assemblages would be influenced by microplastics. After 50 days, filtration by M. edulis was …