502 research outputs found
Charge transfer via a two-strand superexchange bridge in DNA
Charge transfer in a DNA duplex chain is studied by constructing a system
with virtual electrodes connected at the ends of each DNA strand. The systeym
is described by the tight-binding model and its transport is analyzed by the
transfer matrix method. The very weak distance dependence in long
(G:C)(T:A)_M(G:C)_3 DNA chain observed in experiment [B. Giese, et al., Nature
412, 318 (2001)] is explained by a unistep two-strand superexchange bridge
without the need for the multi-step thermally-induced hopping mechanism or the
dephasing effect. The crossover number M_c of (T:A) base pairs, where crossover
between strong and weak distance dependence occurs, reflects the ratio of
intra- and inter-strand neighboring base-base couplings.Comment: accepted for publication in Phys. Rev. Let
Chiral molecular films as electron polarizers and polarization modulators
Recent experiments on electron scattering through molecular films have shown
that chiral molecules can be efficient sources of polarized electrons even in
the absence of heavy nuclei as source of a strong spin-orbit interaction. We
show that self-assembled monolayers (SAMs) of chiral molecules are strong
electron polarizers due to the high density effect of the monolayers and
explicitly compute the scattering amplitude off a helical molecular model of
carbon atoms. Longitudinal polarization is shown to be the signature of chiral
scattering. For elastic scattering, we find that at least double scattering
events must take place for longitudinal polarization to arise. We predict
energy windows for strong polarization, determined by the energy dependences of
spin-orbit strength and multiple scattering probability. An incoherent
mechanism for polarization amplification is proposed, that increases the
polarization linearly with the number of helix turns, consistent with recent
experiments on DNA SAMs.Comment: 5 Pages, 4 figure
Revisión de la segunda fase de «capitalismo artÃstico» del sociólogo Gilles Lipovetsky (1950-1980). Antecedentes y desarrollo de la democratización y propagación de la llamada «sociedad de la abundancia», y esbozo de la tercera fase de «capitalismo artÃstico»
This article aims to outline sociologist Gilles Lipovetsky’s views the views of sociologist Gilles Lipovetsky on the so-called «second phase of cultural capitalism», which occurs. The historical moment between the 1950s and the 1980s and is characterized by the spread of mass consumption and the expansion of cultural industries. The antecedents of this stage, the «first phase of cultural capitalism» date back to 1850 and last until the Second World War. We will use this starting point, the end of the first phase of cultural capitalism, to review the events that gave rise to the spread and democratization of consumption. We will also review the main postulates of the «third phase of cultural capitalism», which is still in force today.El presente artÃculo pretende esbozar los planteamientos del sociólogo Gilles Lipovetsky en torno a la denominada «segunda fase de capitalismo cultural». El momento histórico, fechado entre la década de los cincuenta y los años ochenta, se caracteriza por la propagación del con- sumo de masas y la expansión de las industrias culturales. Los antecedentes de esta etapa, la «primera fase de capitalismo cultural », se remontan a 1850 y se extienden hasta la segunda guerra mundial. Desde esta primera etapa, revisaremos los hechos que dieron lugar a la pro- pagación y democratización del consumo, para finalmente analizar los principales postulados de la «tercera fase de capitalismo cultural», vigentes hasta nuestros tiempos
Shear Modulus of an Elastic Solid under External Pressure as a function of Temperature: The case of Helium
The energy of a dislocation loop in a continuum elastic solid under pressure
is considered within the framework of classical mechanics. For a circular loop,
this is a function with a maximum at pressures that are well within reach of
experimental conditions for solid helium suggesting, in this case, that
dislocation loops can be generated by a pressure-assisted thermally activated
process. It is also pointed out that pinned dislocations segments can alter the
shear response of solid helium, by an amount consistent with current
measurements, without any unpinning.Comment: 5 pages, 3 figure
Perturbation Theory of Schr\"odinger Operators in Infinitely Many Coupling Parameters
In this paper we study the behavior of Hamilton operators and their spectra
which depend on infinitely many coupling parameters or, more generally,
parameters taking values in some Banach space. One of the physical models which
motivate this framework is a quantum particle moving in a more or less
disordered medium. One may however also envisage other scenarios where
operators are allowed to depend on interaction terms in a manner we are going
to discuss below. The central idea is to vary the occurring infinitely many
perturbing potentials independently. As a side aspect this then leads naturally
to the analysis of a couple of interesting questions of a more or less purely
mathematical flavor which belong to the field of infinite dimensional
holomorphy or holomorphy in Banach spaces. In this general setting we study in
particular the stability of selfadjointness of the operators under discussion
and the analyticity of eigenvalues under the condition that the perturbing
potentials belong to certain classes.Comment: 25 pages, Late
The contribution of the Chirality-Induced Spin Selectivity (CISS) effect to the dispersion interaction between chiral molecules
Dispersion interactions are one of the components of van der Waals forces,
which play a key role in the understanding of intermolecular interactions in
many physical, chemical and biological processes. The theory of dispersion
forces was developed by London in the early years of quantum mechanics.
However, it was only in the 1960s that it was recognized that for molecules
lacking an inversion center such as chiral and helical molecules, there are
chirality-sensitive corrections to the dispersion forces proportional to the
rotatory power known from the theory of circular dichroism and with the same
distance scaling law R-6 as the London energy. The discovery of the
Chirality-Induced Spin Selectivity (CISS) effect in recent years has led to an
additional twist in the study of chiral molecular systems, showing a close
relation between spin and molecular geometry. Motivated by it, we propose in
this investigation that there may exist additional contributions to the
dispersion energy related to intermolecular, induced spin-orbit (ISOC)
interactions. Within a second-order perturbative approach, these forces
manifest as an effective intermolecular spin-spin exchange interaction.
Although they are weaker than the standard London forces, the ISOC interactions
turn out to be nevertheless not negligible and display the same R
distance scaling. Our results suggest that classical force field descriptions
of van-der Waals interactions may require additional modifications to include
the effects discussed here.Comment: 21 pages, 2 figure
Electrostatic potential profiles of molecular conductors
The electrostatic potential across a short ballistic molecular conductor
depends sensitively on the geometry of its environment, and can affect its
conduction significantly by influencing its energy levels and wave functions.
We illustrate some of the issues involved by evaluating the potential profiles
for a conducting gold wire and an aromatic phenyl dithiol molecule in various
geometries. The potential profile is obtained by solving Poisson's equation
with boundary conditions set by the contact electrochemical potentials and
coupling the result self-consistently with a nonequilibrium Green's function
(NEGF) formulation of transport. The overall shape of the potential profile
(ramp vs. flat) depends on the feasibility of transverse screening of electric
fields. Accordingly, the screening is better for a thick wire, a multiwalled
nanotube or a close-packed self-assembled monolayer (SAM), in comparison to a
thin wire, a single-walled nanotube or an isolated molecular conductor. The
electrostatic potential further governs the alignment or misalignment of
intramolecular levels, which can strongly influence the molecular I-V
characteristic. An external gate voltage can modify the overall potential
profile, changing the current-voltage (I-V) characteristic from a resonant
conducting to a saturating one. The degree of saturation and gate modulation
depends on the metal-induced-gap states (MIGS) and on the electrostatic gate
control parameter set by the ratio of the gate oxide thickness to the channel
length.Comment: to be published in Phys. Rev. B 69, No.3, 0353XX (2004
Cost effectiveness analysis of clinically driven versus routine laboratory monitoring of antiretroviral therapy in Uganda and Zimbabwe.
BACKGROUND: Despite funding constraints for treatment programmes in Africa, the costs and economic consequences of routine laboratory monitoring for efficacy and toxicity of antiretroviral therapy (ART) have rarely been evaluated. METHODS: Cost-effectiveness analysis was conducted in the DART trial (ISRCTN13968779). Adults in Uganda/Zimbabwe starting ART were randomised to clinically-driven monitoring (CDM) or laboratory and clinical monitoring (LCM); individual patient data on healthcare resource utilisation and outcomes were valued with primary economic costs and utilities. Total costs of first/second-line ART, routine 12-weekly CD4 and biochemistry/haematology tests, additional diagnostic investigations, clinic visits, concomitant medications and hospitalisations were considered from the public healthcare sector perspective. A Markov model was used to extrapolate costs and benefits 20 years beyond the trial. RESULTS: 3316 (1660LCM;1656CDM) symptomatic, immunosuppressed ART-naive adults (median (IQR) age 37 (32,42); CD4 86 (31,139) cells/mm(3)) were followed for median 4.9 years. LCM had a mean 0.112 year (41 days) survival benefit at an additional mean cost of 7386 [3277,dominated] per life-year gained and 3.78 to become cost-effective (<3xper-capita GDP, following WHO benchmarks). CD4 monitoring at current costs as undertaken in DART was not cost-effective in the long-term. CONCLUSIONS: There is no rationale for routine toxicity monitoring, which did not affect outcomes and was costly. Even though beneficial, there is little justification for routine 12-weekly CD4 monitoring of ART at current test costs in low-income African countries. CD4 monitoring, restricted to the second year on ART onwards, could be cost-effective with lower cost second-line therapy and development of a cheaper, ideally point-of-care, CD4 test
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