Institution
University of Portsmouth
Education•Portsmouth, Portsmouth, United Kingdom•
About: University of Portsmouth is a education organization based out in Portsmouth, Portsmouth, United Kingdom. It is known for research contribution in the topics: Population & Galaxy. The organization has 5452 authors who have published 14256 publications receiving 424346 citations. The organization is also known as: Portsmouth and Gosport School of Science and Art & Portsmouth and Gosport School of Science and the Arts.
Topics: Population, Galaxy, Redshift, Context (language use), Computer science
Papers published on a yearly basis
Papers
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University of Portsmouth1, Fermilab2, University of Bonn3, University of Cape Town4, University of Queensland5, University of Copenhagen6, Rutgers University7, University of Chicago8, University of Notre Dame9, University of Pennsylvania10, Stockholm University11, University of Washington12, Wayne State University13, University of California, Berkeley14, Harvard University15, New Mexico State University16, University of Tokyo17, Rochester Institute of Technology18, Johns Hopkins University19, Space Telescope Science Institute20, Pennsylvania State University21, Carnegie Institution for Science22, University of Texas at Austin23, Stanford University24
TL;DR: In this paper, the luminosity distances of Type Ia supernovae from the Sloan Digital Sky Survey-II (SDSS-II) SN Survey in conjunction with other intermediate-redshift (z 97 per cent level from this single data set) were analyzed.
Abstract: We present an analysis of the luminosity distances of Type Ia Supernovae (SNe) from the Sloan Digital Sky Survey-II (SDSS-II) SN Survey in conjunction with other intermediate-redshift (z 97 per cent level from this single data set. We find good agreement between the SN and BAO distance measurements, both consistent with a Λ-dominated cold dark matter cosmology, as demonstrated through an analysis of the distance duality relationship between the luminosity (dL) and angular diameter (dA) distance measures. We then use these data to estimate w within this restricted redshift range (z < 0.4). Our most stringent result comes from the combination of all our intermediate-redshift data (SDSS-II SNe, BAO, ISW and redshift-space distortions), giving w = -0.81+0.16-0.18 (stat) +/- 0.15 (sys) and ΩM = 0.22+0.09-0.08 assuming a flat universe. This value of w and associated errors only change slightly if curvature is allowed to vary, consistent with constraints from the cosmic microwave background. We also consider more limited combinations of the geometrical (SN, BAO) and dynamical (ISW, redshift-space distortions) probes.
133 citations
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TL;DR: In this article, the authors summarize a series of studies on the developmental changes in social cognition in mother-raised infant chimpanzees from birth to around 2 years old, concluding that infants preferentially tracked a photograph of their mother's face at 1 month but showed indifferent preferences to faces at 2 months old.
Abstract: In this paper, we summarize a series of studies on the developmental changes in social cognition in mother-raised infant chimpanzees from birth to around 2 years old. The infants preferentially tracked a photograph of their mother's face at 1 month but showed indifferent preferences to faces at 2 months old. This change in facial recognition was correlated with a decrease in neonatal spontaneous smiling, increase in social smiling and a decline in neonatal imitation of facial expressions. Also at around 2 months, the infants began to show preferences for directed-gaze faces over averted gazes, and the amount of mutual gaze time between mother and infant chimpanzees increased. Thus, by 2 months of age, abilities required for dyadic interactions are already developed in chimpanzees as is the case in humans. The development of triadic interactions, however, is rather different between these two species. The infant chimpanzee can follow another's pointing or gaze at around 1 year, but even by 2 years old, does not “share” attention with the others.
133 citations
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TL;DR: The mechanisms of silicification under controlled laboratory conditions and the implication forsilicification in natural environments are discussed, along with the relevance of the findings in the search for early life on Earth and extraterrestrial life.
Abstract: Evidence of microbial life on Earth has been found in siliceous rock formations throughout the geological and fossil record. To understand the mechanisms of silicification and thus improve our search patterns for evidence of fossil microbial life in rocks, a series of controlled laboratory experiments were designed to simulate the silicification of microorganisms. The bacterial strains Pseudomonas fluorescens and Desulphovibrio indonensis were exposed to silicifying media. The experiments were designed to determine how exposure time to silicifying solutions and to silicifying solutions of different Si concentration affect the fossilization of microbial biofilms. The silicified biofilms were analyzed using transmission electron microscopy (TEM) in combination with energy-dispersive spectroscopy. Both bacterial species showed evidence of silicification after 24 h in 1,000 ppm silica solution, although D. indonensis was less prone to silicification. The degree of silicification of individual cells of the sam...
132 citations
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TL;DR: In this article, the effecinecy of demersal trawlers operation in the English Channel was examined through the estimation of a stochastic frontier production function, and it was postulated that most of this variation was due to differences in skipper and crew skill.
Abstract: Variations in the effecinecy of demersal trawlers operationg in the English Channel were examined through the estimation of a stochastic frontier production function. The most important measurable factor. The most important measurable factor affecting efficiency was the age of the vessel.HOwever, Unmeasurable factors accounted for about 65% of varitions in the efficiency, and as much as 9% of the total variation in catches between boats. IT is postulated that most of this variation was due to differences in skipper and crew skill. In contrast,"luck" accounted for around 11% of the variation in catches between boats.
132 citations
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TL;DR: Methods for the prevention of cell damage and freezing injury during the cooling and low-temperature storage of algal material are discussed and concluding remarks are made on those techniques and conditions providing optimum viability of cryopreserved algae.
Abstract: Since pioneering work in the early 1960s, there has been growing interest and numerous experimental investigations into the cryopreservation of algal material. Mostly, these studies relate to the requirement for long term preservation and storage of algal material contained in culture collections or used in the seaweed mariculture industry. The present review deals with techniques used in the cryopreservation of biological samples and their application to both micro- and macroalgae. Methods for the prevention of cell damage and freezing injury during the cooling and low-temperature storage of algal material are discussed with reference to the effect on viability of such variables as cooling rates, final temperatures attained, the use of various types and concentrations of cryoprotectants, thawing rates, and storage times and temperatures. Some consideration is also given to the various methods used for increasing cell viability, including the induction of freezing tolerance. Cryopreservation protocols employed by numerous workers in this field are detailed, and concluding remarks are made on those techniques and conditions providing optimum viability of cryopreserved algae.
132 citations
Authors
Showing all 5624 results
Name | H-index | Papers | Citations |
---|---|---|---|
Robert C. Nichol | 187 | 851 | 162994 |
Gavin Davies | 159 | 2036 | 149835 |
Daniel Thomas | 134 | 846 | 84224 |
Will J. Percival | 129 | 473 | 87752 |
Claudia Maraston | 103 | 362 | 59178 |
I. W. Harry | 98 | 312 | 65338 |
Timothy Clark | 95 | 1137 | 53665 |
Kevin Schawinski | 95 | 376 | 30207 |
Ashley J. Ross | 90 | 248 | 46395 |
Josep Call | 90 | 451 | 34196 |
David A. Wake | 89 | 214 | 46124 |
L. K. Nuttall | 89 | 253 | 54834 |
Stephen Neidle | 89 | 457 | 32417 |
Andrew Lundgren | 88 | 249 | 57347 |
Rita Tojeiro | 87 | 229 | 43140 |