Thorium redox chemistry is extremely scarce due to the high stability of ThIV. Here we report two unique examples thorium arenide complexes prepared by reduction a ThIV-siloxide complex in presence naphthalene, mononuclear [K(OSi(OtBu)3)3Th(η6-C10H8)] (1) and inverse-sandwich [K(OSi(OtBu)3)3Th]2(μ-η6,η6-C10H8)] (2). The electrons stored these allow broad range substrates (N2O, AdN3, CO2, HBBN)....

Targeted α therapy holds tremendous potential as a cancer treatment: it offers the possibility of delivering a highly cytotoxic dose to targeted cells while minimizing damage to surrounding healthy tissue. The metallic α-generating radioisotopes 225Ac and 227Th are promising radionuclides for therapeutic use, provided adequate chelation and targeting. Here we demonstrate a new chelating platfor...

Different types of excitawry amino acid receptors probably exe t tw specific fiaw~onal roles within the manunaban CNS. t..Glutamate may be the trammitter at all of these receptors, with extracellul+w Mg z + regulating the sensitivity of one particular receptorionophore system. As Jeff Watkins explains, this probable role of L-glutamme remains unproven. But progress is being made in characterizi...

One severe problem in frame-based description languages in that computing subsumytion in computationally intractable for languages of reasonable expressive power. Several partial solutions to this problem are used in knowledge representation systems that incorporate such languages, but none of these solutions are satisfactory if the system is to be of general use in representing knowledge. A ne...

A growing number of farmers’ cooperatives cultivate crops without chemical pesticides, but also organic certification. How does this intermediate form agriculture between conventional and production function? What are the outcomes on cropland biodiversity? model contribute to transition toward more sustainable forms agriculture? We address these research questions using original data collected ...

Aim To emphasize the importance of early recognition, diagnostic processing and emergent surgical treatment of spontaneous spinal epidural hematoma (SSEH). Methods A 39-year-old female presented with sudden onset of severe pain between the shoulder blades followed by paraparesis and alerted sensibility in the lower extremities. An hour later she developed paraplegia with sensory deficits below ...

Due to the increasing number of traffic accidents involving the collisions of vehicles with the emergency-stop-area head walls in tunnels, a comparative numerical analysis in accordance with the EN 1317 standard has been performed in order to assess the quality of the available protective safety barriers. Based on the simulation results, the values of the relevant injury criteria - the accelera...

This paper describes the application of a first order regularization technique to the problem of reconstruction of visible surfaces. Our approach is a computationally efficient first order method that simultaneously achieves approximate in\ nriance and preservation of discontinuities. Our reconstruction method is also robust with respect to the smoothing parameter The robustness property to I a...