1,125 research outputs found
Letter: R.F. Pettigrew to H.L. Loucks, May 30, 1916
No full textR.F. Pettigrew articulates to H.L. Loucks his distaste for the book that Loucks recommended to him. Pettigrew also mentions that he would prefer to remain distanced from any conference with the author of the book. Pettigrew expresses great admiration and interest in Loucks' manuscript and desire to read it further
Description & representation de toutes les victoires tant par eau que par terre, lesquelles Dieu a octroiees aux nobles, hauts & puissants seigneurs, messeignrs. les Estats des Provinces vnies du Païs-Bas, souz la conduite & gouuernement de Son Excellence, le prince Mavrice de Nassav.
No full textTranslation of Den Nassauschen lauren-crans.Added t.p., with title: Les lauriers de Nassav.By J.J. Orlers and H.L. van Haestens.Kraus, H.P. Sir Francis Drake, no. 35Gift of Hans P. and Hanni Kraus
Anaerobic consumers of monosaccharides in a moderately acidic fen
No full text16S rRNA-based stable isotope probing identified active xylose- and glucose-fermenting Bacteria and active Archaea, including methanogens, in anoxic slurries of material obtained from a moderately acidic, CH4 emitting fen. Xylose and glucose were converted to fatty acids, CO2, H-2, and CH4 under moderately acidic, anoxic conditions, indicating that the fen harbors moderately acid-tolerant xylose- and glucose-using fermenters, as well as moderately acid-tolerant methanogens. Organisms of the families Acidaminococcaceae, Aeromonadaceae, Clostridiaceae, Enterobacteriaceae, and Pseudomonadaceae and the order Actinomycetales, including hitherto unknown organisms, utilized xylose- or glucose-derived carbon, suggesting that highly diverse facultative aerobes and obligate anaerobes contribute to the flow of carbon in the fen under anoxic conditions. Uncultured Euryarchaeota (i.e., Methanosarcinaceae and Methanobacteriaceae) and Crenarchaeota species were identified by 16S rRNA analysis of anoxic slurries, demonstrating that the acidic fen harbors novel methanogens and Crenarchaeota organisms capable of anaerobiosis. Fermentation-derived molecules are conceived to be the primary drivers of methanogenesis when electron acceptors other than CO2 are absent, and the collective findings of this study indicate that fen soils harbor diverse, acid-tolerant, and novel xylose-utilizing as well as glucose-utilizing facultative aerobes and obligate anaerobes that form trophic links to novel moderately acid-tolerant methanogens
Bare quark stars or naked neutron stars? The case of RX J1856.5-3754
No full textIn a cool neutron star (T less than or similar to 10(6) K) endowed with a rather highmagnetic field (B greater than or similar to 10(13) G), a phase transition may occur in the outermost layers. As a consequence, the neutron star becomes "bare,'' i.e., no gaseous atmosphere sits on the top of the crust. The surface of a cooling, bare neutron star does not necessarily emit a blackbody spectrum because the emissivity is strongly suppressed at energies below the electron plasma frequency, omega(p). Since omega(p) approximate to 1 keV under the conditions typical of the dense electron gas in the condensate, the emission from a T similar to 100 eV bare neutron star will be substantially depressed with respect to that of a perfect Planckian radiator atmost energies. Here we present a detailed analysis of the emission properties of a bare neutron star. In particular, we derive the surface emissivity for an Fe composition in a range of magnetic fields and temperatures representative of cooling isolated neutron stars, like RX J1856.5 - 3754. We find that the emitted spectrum is strongly dependent on the electron conductivity in the solid surface layers. In the cold electron gas approximation ( no electron-lattice interactions), the spectrum turns out to be a featureless depressed blackbody in the 0.1 - 2 keV band with a steeper low-energy distribution. When damping effects due to collisions between electrons and the ion lattice ( mainly due to electron-phonon interactions) are accounted for, the spectrum is more depressed at low energies and spectral features may be present, depending on the magnetic field strength. Details of the emitted spectrum are found, however, to be strongly dependent on the assumed treatment of the transition from the external vacuum to the metallic surface. The implications of our results for RX J1856.5 - 3754 and other isolated neutron stars are discussed
Tissue plasminogen activator coating on surface of implants reduces S. aureus biofilm formation
No full textStaphylococcus aureus biofilm infections of indwelling medical devices are a major medical challenge because of their high prevalence and antibiotic resistance. As fibrin plays an important role in S. aureus biofilm formation, we hypothesize that coating of the implant surface with fibrinolytic agents can be used as a new method of antibiofilm prophylaxis. The effect of tissue plasminogen activator (tPA) coating on S. aureus biofilm formation was tested with in vitro microplate biofilm assays and an in vivo mouse model of biofilm infection. tPA coating efficiently inhibited biofilm formation by various S. aureus strains. The effect was dependent on plasminogen activation by tPA, leading to subsequent local fibrin cleavage. A tPA coating on implant surfaces prevented both early adhesion and later biomass accumulation. Furthermore, tPA coating increased the susceptibility of biofilm infections to antibiotics. In vivo, significantly fewer bacteria were detected on the surfaces of implants coated with tPA than on control implants from mice treated with cloxacillin. Fibrinolytic coatings (e.g., with tPA) reduce S. aureus biofilm formation both in vitro and in vivo, suggesting a novel way to prevent bacterial biofilm infections of indwelling medical devices.sponsorship: This work was supported by the Swedish Medical Research Council (grants D0275001 and D0275002 to T. Jin), the Swedish Medical Society (grants SLS-496741 and SLS-402871 to T. Jin), the Stiftelsen Clas Groschinskys Minnesfond (grants M1566 and M14099 to T. Jin), the Royal Society of Arts and Sciences in Gothenburg (grant to T. Jin and M. Na), the Wilhelm and Martina Lundgren Foundation (grant to T. Jin, M. Na, J. Kwiecinski, and A. Jarneborn), the Scandinavian Society for Antimicrobial Chemotherapy Foundation (grant SLS-501701 to T. Jin), Rune och Ulla Amlovs Stiftelse for Neurologisk och Reumatologisk Forskning (grant 2015-00056 to T. Jin), Adlerbertska Forskningsstiftelsen (grant to T. Jin and M. Na) and the Research Foundation Flanders (FWO-Vlaanderen) (grant to M. Peetermans and P. Verhamme). The funders had no role in study design, data collection and interpretation or the decision to submit the work for publication. (Swedish Medical Research Council|D0275001, Swedish Medical Research Council|D0275002, Swedish Medical Society|SLS-496741, Swedish Medical Society|SLS-402871, Stiftelsen Clas Groschinskys Minnesfond|M1566, Stiftelsen Clas Groschinskys Minnesfond|M14099, Royal Society of Arts and Sciences in Gothenburg, Wilhelm and Martina Lundgren Foundation, Scandinavian Society for Antimicrobial Chemotherapy Foundation|SLS-501701, Rune och Ulla Amlovs Stiftelse for Neurologisk och Reumatologisk Forskning|2015-00056, Adlerbertska Forskningsstiftelsen, Research Foundation Flanders (FWO-Vlaanderen))status: Publishe
Two impossible microbes with global implications: the nitrite-dependent anaerobic oxidation of methane and ammonium
No full textItem does not contain fulltex
Informatieverwerking tijdens de bestekfase
No full textOTB Research Institute for the Built Environmen
Newspaper Clipping: Author Cornwell wants to help solve Civil War mystery
No full textA newspaper clipping of an article titled 'Author Cornwell wants to help solve Civil War mystery', published in an unknown newspaper on February 15, 2006. The article discusses author Patricia Cornwell's interest in donating funds toward studying what happened to the H.L. Hunley, a Confederate submarine that went missing during the Civil War and was rediscovered and excavated in 2000
South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon
No full textThe exchange of mass, heat, salt and anthropogenic carbon (Cant) between the South Atlantic, south of 24°S, and adjacent ocean basins is estimated from hydrographic data obtained during 2008–2009 using an inverse method. Transports of anthropogenic carbon are calculated across the western (Drake Passage), eastern (30°E) and northern (24°S) boundaries. The freshwater overturning transport of 0.09 Sv is southward, consistent with an overturning circulation that exports freshwater from the North Atlantic, and consistent with a bistable Meridional Overturning Circulation (MOC), under conditions of excess freshwater perturbation. At 30°E, net eastward Antarctic Circumpolar Current (ACC) transport, south of the Subtropical Front, is compensated by a 15.9 ± 2.3 Sv westward flow along the Antarctic boundary. The region as a whole is a substantial sink for atmospheric anthropogenic carbon of 0.51 ± 0.37 Pg C yr−1, of which 0.18 ± 0.12 Pg C yr−1 accumulates and is stored within the water column. At 24°S, a 20.2 Sv meridional overturning is associated with a 0.11 Pg C yr−1 Cant overturning. The remainder is transported into the Atlantic Ocean north of 24°S (0.28 ± 0.16 Pg C yr−1) and Indian sector of Southern Ocean (1.12 ± 0.43 Pg C yr−1), having been enhanced by inflow through Drake Passage (1.07 ± 0.44 Pg C yr−1). This underlines the importance of the South Atlantic as a crucial element of the anthropogenic carbon sink in the global oceans
A study of the 1984 report An Automatic Proof Procedure For Several Geometries by Th. Bruyn and H.L. Claasen
No full textThis report is a discussion of the 1984 report 'An automatic proof procedure for several geometries' by Th. Bruyn and H.L. Claasen, inspired by a personal desire to understand the work of Th. Bruyn. See: http://resolver.tudelft.nl/uuid:b768c6ce-f625-4236-9b0b-32a47fab143e Bruyn and Claasen prove that certain true propositions of the theory of intersections within the two-dimensional projective geometry over the real numbers can be formulated by use of figures. It is proven that figures obtained by manipulating these figures will also correspond to propositions. The method to do so proves that the obtained propositions are a direct consequence of the original propositions and are therefore proven to be true. One of their main results is to use the theorem of Pappus to generate the theorem of Desargues, thereby proving that Desargues follows from Pappus (something that is well known in projective geometry). This report aims to give a comprehensive explanation of their method as well as a detailed demonstration of their procedure. It is a summary of their work with added explanations and examples
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