منابع مشابه
Spontaneous generation of eigenvalues
We show that the action of conformal vector fields on functions on the sphere determines the spectrum of the Laplacian (or the conformal Laplacian), without further input of information. The spectra of intertwining operators (both differential and non-local) with principal part a power of the Laplacian follows as a corollary. An application of the method is the sharp form of Gross’ entropy ineq...
متن کاملSpontaneous generation of modular invariants
It is possible to compute j(τ) and its modular equations with no perception of its related classical group structure except at ∞. We start by taking, for p prime, an unknown “p-Newtonian” polynomial equation g(u, v) = 0 with arbitrary coefficients (based only on Newton’s polygon requirements at ∞ for u = j(τ) and v = j(pτ)). We then ask which choice of coefficients of g(u, v) leads to some cons...
متن کاملSpontaneous generation of mammalian prions.
Prions are transmissible agents that cause lethal neurodegeneration in humans and other mammals. Prions bind avidly to metal surfaces such as steel wires and, when surface-bound, can initiate infection of brain or cultured cells with remarkable efficiency. While investigating the properties of metal-bound prions by using the scrapie cell assay to measure infectivity, we observed, at low frequen...
متن کاملSpontaneous current generation in gated nanostructures
– We have observed an unusual dc current spontaneously generated in the conducting channel of a short-gated GaAs transistor. The magnitude and direction of this current critically depend upon the voltage applied to the gate. We propose that it is initiated by the injection of hot electrons from the gate that relax via phonon emission. The phonons then excite secondary electrons from asymmetrica...
متن کاملBirth of a Prion: Spontaneous Generation Revisited
The proposal that the transmissible agent in prion diseases can be a conformationally altered host protein that multiplies by autocatalytic conversion has gained wide acceptance. Recent work shows that the agent, the prion, can be replicated in a cell-free system, that it can be generated de novo, and that the strain-specific properties of prions are encoded by conformational variations of the ...
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ژورنال
عنوان ژورنال: Nature
سال: 1871
ISSN: 0028-0836,1476-4687
DOI: 10.1038/003225a0