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Stephen MT Hoke Gaoyang Liang A Irina Mutiu Julie Genereaux Christopher J Brandl 《BMC biochemistry》2007,8(1):16
Background
Spt7 is an integral component of the multi-subunit SAGA complex that is required for the expression of ~10% of yeast genes. Two forms of Spt7 have been identified, the second of which is truncated at its C-terminus and found in the SAGA-like (SLIK) complex. 相似文献2.
We prove that the small scale structures of the stochastically forced Navier–Stokes equations approach those of the naturally associated Ornstein–Uhlenbeck process as the scales get smaller. Precisely, we prove that the rescaled kth spatial Fourier mode converges weakly on path space to an associated Ornstein–Uhlenbeck process as |k| . In addition, we prove that the Navier–Stokes equations and the naturally associated Ornstein–Uhlenbeck process induce equivalent transition densities if the viscosity is replaced with hyper-viscosity. This gives a simple proof of unique ergodicity for the hyperviscous Navier–Stokes system. We show how different strengthened hyperviscosity produce varying levels of equivalence. 相似文献
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Toufic M. Suidan 《纯数学与应用数学通讯》2005,58(5):620-638
We study a randomly forced Burgers equation and its corresponding Hamilton‐Jacobi equation on the line. The forcing is of the form of a randomly modulated and shifted potential. We prove the existence of invariant probability measures and provide examples for which these measures are not unique. These measures do exhibit certain ergodic behavior. The methods we use are closely connected to the Lax‐Ole?inik variational principle. © 2004 Wiley Periodicals, Inc. 相似文献
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Toufic Suidan 《Journal of statistical physics》2000,101(3-4):893-903
This paper studies several problems in adhesion dynamics on the real line. We consider an ensemble of particles with i.i.d. initial velocities. In the gravitational case, we identify a shock time and describe several aspects of the mass aggregation process before, at and after this time. We also study the long time behavior of the ballistic aggregation process. 相似文献
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Simple Systems with Anomalous Dissipation and Energy Cascade 总被引:1,自引:0,他引:1
Jonathan C. Mattingly Toufic Suidan Eric Vanden-Eijnden 《Communications in Mathematical Physics》2007,276(1):189-220
We analyze a class of dynamical systems of the type where f
n
(t) is a forcing term with only for and the coupling coefficients c
n
satisfy a condition ensuring the formal conservation of energy . Despite being formally conservative, we show that these dynamical systems support dissipative solutions (suitably defined)
and, as a result, may admit unique (statistical) steady states when the forcing term f
n
(t) is nonzero. This claim is demonstrated via the complete characterization of the solutions of the system above for specific
choices of the coupling coefficients c
n
. The mechanism of anomalous dissipations is shown to arise via a cascade of the energy towards the modes with higher n; this is responsible for solutions with interesting energy spectra, namely scales as as n→∞. Here the exponents α depend on the coupling coefficients c
n
and denotes expectation with respect to the equilibrium measure. This is reminiscent of the conjectured properties of the solutions
of the Navier-Stokes equations in the inviscid limit and their accepted relationship with fully developed turbulence. Hence,
these simple models illustrate some of the heuristic ideas that have been advanced to characterize turbulence, similar in
that respect to the random passive scalar or random Burgers equation, but even simpler and fully solvable. 相似文献
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Statistical evaluation of an analytical GC/MS method for the determination of long chain fatty acids
In-depth evaluation of an analytical method to detect and quantify long chain fatty acids (C8-C16) at trace level concentrations (25-1000 μg/l) is presented. The method requires derivatization of the acids with methanolic boron trifluoride, separation, and detection by gas chromatography-mass spectrometry. The calibration experiments passed all the tested performance criteria such as linearity, homoscedasticity, and ruggedness. The detection limits and related quantities were computed by applying the method detection limit, and the calibration line approximation. The values obtained by applying the latter approach were more reliable and consistent with the actual statistical theory of detection decisions and yielded the following concentrations: C8, 87.6 μg/l; C10, 45.2 μg/l; C11, 39.9 μg/l; C12, 37.7 μg/l; C14, 41.4 μg/l and C16, 40.6 μg/l. Two different gas-liquid chromatographic columns were tested and similar results achieved, which shows the ruggedness of the method. 相似文献
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Jonathan C. Mattingly Toufic M. Suidan Eric Vanden-Eijnden 《Journal of statistical physics》2007,128(5):1145-1152
We study a system of stochastically forced infinite-dimensional coupled harmonic oscillators. Although this system formally
conserves energy and is not explicitly dissipative, we show that it has a nontrivial invariant probability measure. This phenomenon,
which has no finite dimensional equivalent, is due to the appearance of some anomalous dissipation mechanism which transports
energy to infinity. This prevents the energy from building up locally and allows the system to converge to the invariant measure.
The invariant measure is constructed explicitly and some of its properties are analyzed. 相似文献
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