97,454 research outputs found
A O. Sperlingio, R. C. Wagnero, J. G. Wagnero, J. C. Wolf, Chr. Woltereck
No full textA O. SPERLINGIO, R. C. WAGNERO, J. G. WAGNERO, J. C. WOLF, CHR. WOLTERECK
Epistolae ad Sebastianum Kortholt (-)
A O. Sperlingio, R. C. Wagnero, J. G. Wagnero, J. C. Wolf, Chr. Woltereck (B-11) ( - )
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Language and Psychology
No full textThe chapter presents the cultural history of colours in the Middle Ages, with reference to some languages: Old and Middle English (C. Biggam), Old Norse-Icelandic (Wolf), Latin (Molinelli) and Old East Slavic (Krivko)
Microwave surface resistance in BSCCO crystal: magnetic field and angular measurement.
No full textWe report on measurement of the microwave surface resistance R-s at 48 GHz on a BSCCO (2212 phase) crystal. We describe the procedure developed to perform measurements on crystals by the use of a resonant cavity with end-wall-replacement technique. The measurements are taken as a function of the temperature, magnetic field and angle theta between the field orientation and the (a,b) planes. The measured R-s is strongly anisotropic. The overall angular behavior reasonably follows the sin theta scaling rule, but deviation from this simple behavior appears approaching the parallel orientation. When the field is parallel to the (a,b) planes, a local maximum is observed in R-s, instead of a minimum. Finally, we show that the magnetic field dependence of R-s cannot be easily reconciled with existing theories for the motion of rigid flux lines
Three planets orbiting Wolf 1061
No full textWe use archival HARPS spectra to detect three planets orbiting the M3 dwarf Wolf 1061 (GJ 628). We detect a 1.36M⊕ minimum-mass planet with an orbital period P = 4.888 days (Wolf 1061b), a 4.25M⊕ minimum-mass planet with orbital period P = 17.867 days (Wolf 1061c), and a likely 5.21M⊕ minimum-mass planet with orbital period P = 67.274 days (Wolf 1061d). All of the planets are of sufficiently low mass that they may be rocky in nature. The 17.867 day planet falls within the habitable zone for Wolf 1061 and the 67.274 day planet falls just outside the outer boundary of the habitable zone. There are no signs of activity observed in the bisector spans, cross-correlation FWHMs, calcium H & K indices, NaD indices, or Hα indices near the planetary periods. We use custom methods to generate a cross-correlation template tailored to the star. The resulting velocities do not suffer the strong annual variation observed in the HARPS DRS velocities. This differential technique should deliver better exploitation of the archival HARPS data for the detection of planets at extremely low amplitudes
European conservation policy needs a clear definition of ‘wolf-dog hybrid’
No full textAnthropogenic hybridisation, especially when introgressive through backcrossing into parental species, is a global threat to many wild taxa, including wolves (Canis lupus) interbreeding with dogs (C. familiaris or C. l. familiaris) (i.e., wolf-dog hybridisation, WDH). Despite the Standing Committee of the Bern Convention's recently approved proposal to reduce the protection status of wolves from Appendix II to Appendix III, the assessment of Favourable Conservation Status (FCS) for wolves within the EU Habitats Directive does not consider anthropogenic hybridisation as a separate threat category. Hybrids being increasingly recognised as a relevant threat to European wolves, we advocate that WDH should be considered in assessing their conservation status. However, the lack of a clear and commonly accepted definition of wolf-dog hybrids has been limiting progress on legislation, policy, and conservation management. Therefore, to help mitigate the threat of WDH to wolves, we hereby propose a science-based definition of wolf-dog hybrids as a reference for conservation management. The definition is not intended to prescribe management, which will require case-by-case consideration of various factors including local regulations, conservation priorities, ethics, animal welfare, and human dimensions. It (1) provides an entity for legal and policy efforts, (2) promotes shared and transparent technical standards for hybrid identification, and (3) acknowledges the need for nuanced, population-based management policies. The definition provides an essential first step and an international reference that we envision will help mitigate the threat of WDH to wolves and preserve wolf ecological function
Mortality parameters of the wolf in Italy: does the wolf keep himself from the door?
No full textInformation on population parameters is rarely collected from carcasses. This method can be particularly useful - with limitations - when protected species are involved (e.g. the grey wolf Canis lupus in Italy). Local data on population structure, reproduction, survivorship and causes of mortality are necessary to build reliable conservation models to assess the state of a population and to predict its evolution. On the other hand, 'best guesses' or data from ecologically different areas have often been used to build population viability analysis and other conservation-oriented models. A sample of 154 wolf carcasses was found, collected and analysed from 1991 to 2001 in central-eastern Italy, the historic core of the wolf distribution range. Collision with a vehicle was the main cause of death in both sexes; however, road kills may be biased with a greater detectability, and we treated our data accordingly. Road kills were concentrated on the younger (≤4 years old) age classes, whereas fully adult wolves died mainly because of poaching, intraspecific strife and pathologies. Cubs and subadults (≤2 years old) showed a mortality peak in November/December, at the beginning of the dispersal period, whereas adults died mainly in January/February (mating season). The population structure of our sample of wolf carcasses appeared to be well balanced, although perinatal and cub mortality was underestimated. The sex ratio was 1:1 in the younger age classes and 1:0.7 in the older age classes. Only 20.7% of females, 2-6 years old, showed signs of reproduction; placental scar and embryo number varied from one to seven (mean, 4.4) per individual. Survivorship theoretical curves indicated a fair survival of cubs and subadults, but a steep decline as wolves approached maximum life span (9 years old). Our data and other published data on food habits and genetic features of the wolf in central-eastern Italy suggest that, despite ongoing heavy human-induced losses, this predator has fully recovered in the last 30 years from the brink of extinction. © 2007 The Zoological Society of London
F-18 TO-HALOGEN EXCHANGE-REACTION ON ALPHA,ALPHA,ALPHA-TRIHALOTOLUENES - A USEFUL ROUTE TO NO-CARRIER-ADDED (NCA) F-18 LABELED SUBSTITUTED ALPHA,ALPHA,ALPHA-TRIFLUOROTOLUENES
No full textA general method for the synthesis of substituted α,α,α-[18F]-trifluorotoluenes is described. Reactions of RC6H4CCl3 (R = H, p-Cl, o-F, m-F, m-NO2) and RC6H4CF3 (R = H, m-NO2, p-NO2, o-F, m-F) with two different radiofluorinating agents, [H-18F + Sb2O3] and [H-18F + SbF3], give the corresponding α,α,α-[18F]-trifluoro derivs. in 0-75% radiochem. yield. The radioactive products yields depended upon the nature of the R substituent and the reaction conditions. A discussion on the possible reaction mechanisms involved is reported
The costs and benefits of animal predation: An analysis of Scandinavian wolf re-colonization.
No full textAfter coming close to extinction, the grey wolf (Canis lupus) has re-colonized Scandinavia during the last two decades. The current population numbers some 100–120 individuals, and is distributed in small packs along the Swedish–Norwegian border. However, with wolf re-colonization, several conflicts have arisen. One conflict is due to wolf predation on livestock, especially sheep and reindeer. Another is predation on wild ungulates. As the wolves have shown a strong preference for moose (Alces alces) in this respect, a smaller moose population is available for game hunting. The cost of increased moose predation by wolves is examined using a two-step process. First, we analyse the costs to landowners, comprising the loss of animals potentially available for hunting less the reduction in browsing damage associated with a smaller moose population. Second, we examine the problem from a broader point of view, where costs external to landowners and local communities are included. By far the most important cost here is damage related to collisions between moose and motor vehicles.
Time After Time: Electroconvulsive Therapy Modulates the Brain's Functional Network Connectivity Dynamics
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