Institution
Sofia University
Education•Sofia, Bulgaria•
About: Sofia University is a education organization based out in Sofia, Bulgaria. It is known for research contribution in the topics: Large Hadron Collider & Laser. The organization has 8533 authors who have published 15730 publications receiving 306320 citations. The organization is also known as: University of Sofia & BFUS.
Topics: Large Hadron Collider, Laser, Population, Standard Model, Adsorption
Papers published on a yearly basis
Papers
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TL;DR: High yields of intracellular enzymes from yeast can be obtained by application of a series of electric field pulses with a flow process, which are higher than those obtained by mechanical disintegration or enzymatic lysis.
92 citations
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Vardan Khachatryan1, Albert M. Sirunyan1, Armen Tumasyan1, Wolfgang Adam2 +2127 more•Institutions (175)
TL;DR: In this paper, the second-order and third-order anisotropy harmonics of K0S and Lambda/anti-Lambda particles were measured over a wide range in pseudorapidity and full azimuth.
92 citations
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TL;DR: In this paper, the authors used the Th-Pb chronometer to record distinct events in a single rock and highlight the need for identifying the potential involvement of fluids in order to interpret monazite ages.
92 citations
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Academy of Sciences of the Czech Republic1, Czech University of Life Sciences Prague2, The Catholic University of America3, University of the Basque Country4, University of Belgrade5, Swedish University of Agricultural Sciences6, Masaryk University7, Hungarian Academy of Sciences8, National Academy of Sciences of Ukraine9, University of Patras10, University of Vienna11, University of Lausanne12, Slovak Academy of Sciences13, Martin Luther University of Halle-Wittenberg14, University of Wrocław15, University of Pécs16, Virginia Tech College of Natural Resources and Environment17, Centre national de la recherche scientifique18, University of Tartu19, University of Natural Resources and Life Sciences, Vienna20, Flemish Community21, Aarhus University22, Slovenian Academy of Sciences and Arts23, University of Zagreb24, Aristotle University of Thessaloniki25, Sofia University26, Swiss Federal Institute for Forest, Snow and Landscape Research27
TL;DR: The main biogeographic patterns and climate-related gradients in species composition of European floodplain forests and alder carrs were determined using detrended correspondence analysis and cluster analysis as mentioned in this paper.
Abstract: Aim: Formalized classifications synthesizing vegetation data at
the continental scale are being attempted only now, although
they are of key importance for nature conservation planning.
Therefore, we aim to provide a vegetation classification and to
describe the main biogeographical patterns of floodplain
forests and alder carrs in Europe. Location: Europe. Methods: A
database of more than 40 000 vegetation plots of floodplain
forests and alder carrs across Europe was compiled. After
geographic stratification, 16 392 plots were available for
classification, which was performed using the supervised method
Cocktail. We also searched for new associations using
semi-supervised K-means classification. The main biogeographic
patterns and climate-related gradients in species composition
were determined using detrended correspondence analysis and
cluster analysis. Results: Thirty associations of floodplain
forests and alder carrs were distinguished, which belong to
five alliances. The Alnion incanae includes riparian, seepage
and hardwood floodplain forests in the nemoral and hemiboreal
zones (dominated by Alnus glutinosa and Fraxinus excelsior) and
in the boreal zone (dominated by A. incana). The Osmundo-Alnion
represents oceanic vegetation dominated by Alnus glutinosa,
Fraxinus angustifolia and F. excelsior distributed mostly on
the Iberian Peninsula and composed of species with Atlantic
distribution and Iberian endemics. The Populion albae comprises
floodplain forests frequently dominated by Fraxinus
angustifolia, Populus alba and P. nigra that are widespread in
floodplains of large rivers under summer-dry climates in the
Mediterranean region. The Platanion orientalis represents
eastern Mediterranean floodplain forests dominated by Platanus
orientalis. The Alnion glutinosae includes forest swamps
dominated by Alnus glutinosa distributed mostly in the nemoral
and hemiboreal zones. The main biogeographic patterns within
European floodplain forests and alder carrs reflect the
climatic contrasts between the Mediterranean, nemoral, boreal
and mountain regions. Oceanic floodplain forests differ from
those in the rest of Europe. The hydrological regime appears to
be the most important factor influencing species composition
within regions. Conclusions: This study is the first applying a
formalized classification at the association level for a broad
vegetation type at the continental scale. The proposed
classification provides the scientific basis for the necessary
improvement of the habitat classification systems used in
European nature conservation.
92 citations
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TL;DR: In this paper, the authors used the BIOGEN model to assess the response of this coastal ecosystem to eutrophication by the Danube River and found that phosphate, rather than silicate, was the limiting nutrient driving the structure of the phytoplankton community and the planktonic food web.
Abstract: The ecological model BIOGEN, describing the carbon, nitrogen, phosphorus and silicon cycling throughout aggregated chemical and biological compartments of the planktonic and benthic marine systems, has been implemented in the north-western Black Sea to assess the response of this coastal ecosystem to eutrophication by the Danube River. The trophic resolution of BIOGEN was chosen to simulate the major ecological changes reported in this coastal area since the 1960s. Particular attention was paid to establishing the link between quantitative and qualitative changes in nutrients, phytoplankton composition and food-web structures. The BIOGEN numerical code structure includes 34 state variables assembled in five interactive modules describing the dynamics of (1) phytoplankton composed of three distinct groups, each with a different trophic fate (diatoms, nanophytoflagellates, non-silicified opportunistic species); (2) meso- and microzooplankton; (3) trophic dead-end gelatinous organisms composed of three distinct groups (the omnivorous Noctiluca and the carnivores Aurelia and the alienMnemiopsis ), and organic matter degradation and associated nutrient regeneration processes by (4) planktonic and (5) benthic bacteria. The capability of the BIOGEN model to simulate the recent ecosystem changes reported for the Black Sea was demonstrated by running the model for the period 1985–1995. The BIOGEN code was implemented in an aggregated and simplified representation of the north-western Black Sea hydrodynamics. The numerical frame consisted of coupling a 0-D BIOGEN box model subjected to the Danube with a 1-D BIOGEN representing the open-sea boundary conditions. Model results clearly showed that the eutrophication-related problems of the north-western Black Sea were not only driven by the quantity of nutrients discharged by the Danube, but that the balance between them was also important. BIOGEN simulations clearly demonstrated that phosphate, rather than silicate, was the limiting nutrient driving the structure of the phytoplankton community and the planktonic food-web. In particular, it showed that a well-balanced N:P:Si nutrient enrichment, such as that observed in 1991, had a positive effect on the linear, diatom–copepod food-chain, while the regenerated-based microbial food-chain remained at its background level. When present, the gelatinous carnivores also benefited from this enrichment throughout their feeding on copepods. A synergetic effect of fishing pressure and cultural eutrophication was further indirectly suggested by modifying the mortality coefficient of copepods. However, BIOGEN scenarios with unbalanced nutrient inputs, such as nitrogen or phosphate deficiency recorded in 1985 and 1995, predicted the dominance of an active microbial food-web in which bacteria and microzooplankton played a key role; the former as nutrient regenerator, the latter as a trophic path to the copepods and hence to the carnivorous. In such conditions, however, a significant biomass reduction of all gelatinous organisms was simulated, in perfect agreement with recent observations. From these model scenarios it is suggested that the observed positive signs of Black Sea ecosystem recovery might well be related to the reduction of nutrient loads in particular phosphate, by the Danube.
92 citations
Authors
Showing all 8600 results
Name | H-index | Papers | Citations |
---|---|---|---|
Michael Tytgat | 134 | 1449 | 94133 |
Leander Litov | 133 | 1424 | 92713 |
Eric Conte | 132 | 1206 | 84593 |
Georgi Sultanov | 132 | 1493 | 93318 |
Plamen Iaydjiev | 131 | 1285 | 87958 |
Anton Dimitrov | 130 | 1236 | 86919 |
Jordan Damgov | 129 | 1195 | 85490 |
Borislav Pavlov | 129 | 1245 | 86458 |
Jean-Laurent Agram | 128 | 1221 | 84423 |
Cristina Botta | 128 | 1160 | 79070 |
Jean-Charles Fontaine | 128 | 1190 | 84011 |
Peicho Petkov | 128 | 1111 | 83495 |
Muhammad Ahmad | 128 | 1187 | 79758 |
Roumyana Hadjiiska | 126 | 1003 | 73091 |
Mircho Rodozov | 124 | 972 | 70519 |