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Search Results: 1 - 10 of 96 matches for " Dittmar "
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EVALUATION OF ECTOPARASITES ON THE GUINEA PIG MUMMIES OF EL YARAL AND MOQUEGUA VALLEY, IN SOUTHERN PERU
Dittmar,Katharina;
Chungará (Arica) , 2000, DOI: 10.4067/S0717-73562000000100020
Abstract: generally, well preserved arthropod remains are rarely found among archaeological materials. the outstanding preservation of some mummified guinea pigs from the excavation of el yaral, an archeological site in the moquegua valley in southern peru, gave rise to the idea of recovering ectoparasites, that once infested those guinea pigs. ectoparasites are arthropods, like lice, fleas and mites, who can be a serious threat to animals and humans by causing skin lesions or even transmitting diseases
Chimeras are not everything
Katharina Dittmar
Trends in Evolutionary Biology , 2011, DOI: 10.4081/eb.2011.e4
Abstract: The uniting thread of the book is an attempt at an integrated view of the evolution of sensory systems, life, and its consciousness. To accomplish this, the book fuses opinions from different fields of science, and just like the greek mythical fire-breathing chimera, the result is strong, but also impossible. The book starts out with prototypes of life, and their complex beginnings and interactions. Viruses are introduced as harbingers of selves, as regulators of life and creators of novel genetic combinations. This is followed by an argument for the simultaneous nature of growth processes and early life, contrasting it to the galvanism of the primordial soup theory. Bacterial signaling and sensing is treated as the forerunner of community forming and interaction.
Revista Coluna/Columna y SILACo
Michael Dittmar
Coluna/Columna , 2010, DOI: 10.1590/s1808-18512010000300001
Abstract:
EVALUATION OF ECTOPARASITES ON THE GUINEA PIG MUMMIES OF EL YARAL AND MOQUEGUA VALLEY, IN SOUTHERN PERU
Katharina Dittmar
Chungará (Arica) - Revista de Antropología Chilena , 2000,
Abstract: Generally, well preserved arthropod remains are rarely found among archaeological materials. The outstanding preservation of some mummified guinea pigs from the excavation of El Yaral, an archeological site in the Moquegua Valley in Southern Peru, gave rise to the idea of recovering ectoparasites, that once infested those guinea pigs. Ectoparasites are arthropods, like lice, fleas and mites, who can be a serious threat to animals and humans by causing skin lesions or even transmitting diseases Excavaciones arqueológicas en el sitio El Yaral, valle de Moquegua, sur del Perú, revelan la presencia de cuyes en excelente estado de conservación. Esto motivo la investigación de ectoparásitos en estos animales. Los ectoparásitos como los piojos, pulgas y ácaros son artropodos que pueden poner en riesgo la salud de las personas y animales ya que pueden causar serias lesiones a la piel e incluso transmitir enfermedades
The Future of Nuclear Energy: Facts and Fiction Chapter IV: Energy from Breeder Reactors and from Fusion?
Michael Dittmar
Physics , 2009,
Abstract: The accumulated knowledge and the prospects for commercial energy production from fission breeder and fusion reactors are analyzed in this report. The publicly available data from past experimental breeder reactors indicate that a large number of unsolved technological problems exist and that the amount of "created" fissile material, either from the U238 --> Pu239 or from the Th232 --> U233 cycle, is still far below the breeder requirements and optimistic theoretical expectations. Thus huge efforts, including many basic research questions with an uncertain outcome, are needed before a large commercial breeder prototype can be designed. Even if such efforts are undertaken by the technologically most advanced countries, it will take several decades before such a prototype can be constructed. We conclude therefore, that ideas about near-future commercial fission breeder reactors are nothing but wishful thinking. We further conclude that, no matter how far into the future we may look, nuclear fusion as an energy source is even less probable than large-scale breeder reactors, for the accumulated knowledge on this subject is already sufficient to say that commercial fusion power will never become a reality.
The Future of Nuclear Energy: Facts and Fiction Chapter II: What is known about Secondary Uranium Resources?
Michael Dittmar
Physics , 2009,
Abstract: During 2009 nuclear power plants, with a capacity of 370 GWe, will produce roughly 14% of the worldwide electric energy. About 65000 tons of natural uranium equivalent are required to operate these reactors. For 15 years on average only 2/3 of this fuel is provided by the uranium mines and 1/3 comes from secondary resources. In this paper the situation concerning the secondary resources at the beginning of the year 2009 is presented. The data used are from the IAEA/NEA 2007 Red Book, "Uranium Resources, Production and Demand", and from the World Nuclear Association (WNA). Our analysis shows that these civilian stocks will be essentially exhausted within the next 5 years. This coincides roughly with the year 2013, when the delivery of the 10000 tons of natural uranium equivalent from russian military stocks to the USA will end. As the majority of the remaining civilian stocks, about 30000 tons, are believed to be under the control of the US government and american companies, it seems rather unlikely that the USA will share their own strategic uranium reserves with other large nuclear energy users. All data indicate that a uranium supply shortage in many OECD countries can only be avoided if the remaining military uranium stocks from Russia and the USA, estimated to be roughly 500000 tons are made available to the other countries.
The Future of Nuclear Energy: Facts and Fiction Chapter I: Nuclear Fission Energy Today
Michael Dittmar
Physics , 2009,
Abstract: Nuclear fission energy is considered to be somewhere between the holy grail, required to solve all energy worries of the human industrialized civilization, and a fast path directly to hell. Discussions about future energy sources and the possible contribution from nuclear energy are often dominated by variations of fundamentalists and often irrational approaches. As a result, very little is known by the general public and even by decision makers about the contribution of nuclear energy today, about uranium supplies, uranium resources and current and future technological challenges and limitations. This analysis about nuclear energy and its contribution for tomorrow tries to shed light on the nuclear reality and its limitations in the near and long term future. The report, presented in four chapters, is based essentially on the data provided in the documents from the IAEA (International Atomic Energy Administration) and the NEA (the Nuclear Energy Agency from the OECD countries, the WNA (World Nuclear Association) and the IEA (International Energy Agency).
Neutral Current Interference in the TeV Region; the Experimental Sensitivity at the LHC
Michael Dittmar
Physics , 1996, DOI: 10.1103/PhysRevD.55.161
Abstract: The possibilities to measure lepton forward--backward asymmetries at the LHC in the reaction pp(qqbar) --> l+l- are studied for dilepton events with masses above 400 GeV. It is shown that such measurements allow accurate tests of the neutral current interference structure up to about 2 TeV center of mass energies. The sensitivity of asymmetries at the LHC to new physics is demonstrated within the context of quark compositeness and exotic Z' scenarios.
Searching for the Higgs and other Exotic Objects; A ``How to'' Guide from LEP to the LHC
Michael Dittmar
Physics , 1999,
Abstract: Methods and ideas to search for new phenomena at existing and future collider facilities like LEPII and the LHC are analysed. Emphasis is put on the experimental aspects of discovery strategies for the Higgs Boson of the Standard Model. This is followed by a critical analysis of search methods for the extended Higgs sector and the direct detection of Supersymmetric Particles within the Minimal Supersymmetric Standard Model. We also discuss methods and the potential mass reach of the LHC experiments to discover new Bosons and Fermions.
SUSY discovery strategies at the LHC
Michael Dittmar
Physics , 1999,
Abstract: Current ideas for SUPERSYMMETRY searches at the LHC are reviewed. We analyse the discovery prospects for various supersymmetric particles and describe recent ideas on the possibilities of detailed SUSY studies at the LHC. We also combine today's experimental knowledge with some speculations about what might be known by the year 2005 to provide a realistic picture for the LHC start.
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