668 research outputs found
Photonic Band Gaps of Three-Dimensional Face-Centered Cubic Lattices
We show that the photonic analogue of the Korringa-Kohn-Rostocker method is a
viable alternative to the plane-wave method to analyze the spectrum of
electromagnetic waves in a three-dimensional periodic dielectric lattice.
Firstly, in the case of an fcc lattice of homogeneous dielectric spheres, we
reproduce the main features of the spectrum obtained by the plane wave method,
namely that for a sufficiently high dielectric contrast a full gap opens in the
spectrum between the eights and ninth bands if the dielectric constant
of spheres is lower than the dielectric constant of
the background medium. If , no gap is found in the
spectrum. The maximal value of the relative band-gap width approaches 14% in
the close-packed case and decreases monotonically as the filling fraction
decreases. The lowest dielectric contrast for which a
full gap opens in the spectrum is determined to be 8.13. Eventually, in the
case of an fcc lattice of coated spheres, we demonstrate that a suitable
coating can enhance gap widths by as much as 50%.Comment: 19 pages, 6 figs., plain latex - a section on coated spheres, two
figures, and a few references adde
Photonic crystals of coated metallic spheres
It is shown that simple face-centered-cubic (fcc) structures of both metallic
and coated metallic spheres are ideal candidates to achieve a tunable complete
photonic bandgap (CPBG) for optical wavelengths using currently available
experimental techniques. For coated microspheres with the coating width to
plasma wavelength ratio and the coating and host
refractive indices and , respectively, between 1 and 1.47, one can
always find a sphere radius such that the relative gap width (gap
width to the midgap frequency ratio) is larger than 5% and, in some cases,
can exceed 9%. Using different coatings and supporting liquids, the width
and midgap frequency of a CPBG can be tuned considerably.Comment: 14 pages, plain latex, 3 ps figures, to appear in Europhys. Lett. For
more info on this subject see
http://www.amolf.nl/research/photonic_materials_theory/moroz/moroz.htm
Multiplicity Fluctuations in the Pion-Fireball Gas
The pion number fluctuations are considered in the system of pions and large
mass fireballs decaying finally into pions. A formulation which gives an
extension of the model of independent sources is suggested. The grand canonical
and micro-canonical ensemble formulations of the pion-fireball gas are
considered as particular examples.Comment: 13 pages, 4 figure
Target structure independent elastic scattering at low momentum transfers
Analyzing powers and cross sections for the elastic scattering of polarized
7Li by targets of 6Li, 7Li and 12C are shown to depend only on the properties
of the projectile for momentum transfers of less than 1.0 fm-1. The result of a
detailed analysis of the experimental data within the framework of the coupled
channels model with ground state reorientation and transitions to the excited
states of the projectile and targets included in the coupling schemes are
presented. This work suggests that nuclear properties of weakly-bound nuclei
can be tested by elastic scattering experiments, independent of the target
used, if data are acquired for momentum transfers less than ~1.0 fm-1.Comment: 9 pages, 4 figures, 1 table, accepted in Phys. Lett.
ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅ΡΡΡΡΠ½ΡΡ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ Π±Π°Π»Π»ΠΎΠ½ΠΎΠ²
Experimental and theoretical methods of studying life characteristics of metal-composite high-pressure cylinders are considered. It is shown that the stiffness of a load-bearing composite shell has a considerable effect on service life of the cylinders. Experimental results and their comparison with data of theoretical calculations are presented.Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎ-ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ΅ΡΡΡΡΠ½ΡΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
Π±Π°Π»Π»ΠΎΠ½ΠΎΠ² Π²ΡΡΠΎΠΊΠΎΠ³ΠΎ Π΄Π°Π²Π»Π΅Π½ΠΈΡ. ΠΠΎΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ, ΡΡΠΎ ΠΆΠ΅ΡΡΠΊΠΎΡΡΡ ΡΠΈΠ»ΠΎΠ²ΠΎΠΉ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΠΈ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ Π²Π»ΠΈΡΠ΅Ρ Π½Π° ΡΠ΅ΡΡΡΡ Π±Π°Π»Π»ΠΎΠ½ΠΎΠ². ΠΡΠΈΠ²ΠΎΠ΄ΡΡΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈ ΠΈΡ
ΡΠΎΠΏΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ Ρ Π΄Π°Π½Π½ΡΠΌΠΈ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ°ΡΡΠ΅ΡΠΎΠ²
Sequence Effects on DNA Entropic Elasticity
DNA stretching experiments are usually interpreted using the worm-like chain
model; the persistence length A appearing in the model is then interpreted as
the elastic stiffness of the double helix. In fact the persistence length
obtained by this method is a combination of bend stiffness and intrinsic bend
effects reflecting sequence information, just as at zero stretching force. This
observation resolves the discrepancy between the value of A measured in these
experiments and the larger ``dynamic persistence length'' measured by other
means. On the other hand, the twist persistence length deduced from
torsionally-constrained stretching experiments suffers no such correction. Our
calculation is very simple and analytic; it applies to DNA and other polymers
with weak intrinsic disorder.Comment: LaTeX; postscript available at
http://dept.physics.upenn.edu/~nelson/index.shtm
ΠΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΈΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½Π° ΠΏΡΠΈ Π½ΠΎΠ·ΠΎΠΊΠΎΠΌΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠ½Π΅Π²ΠΌΠΎΠ½ΠΈΠΈ
The aim of the study was the assessment of aerosolized colistin (AC) efficacy as adjunctive therapy to systemic antibiotic therapy for nosocomial pneumonia (NP).Materials and methods. This observation study included 90 NP patients under critical care. The primary criterion of therapy efficacy was NP resolution. As the secondary criteria of therapy efficacy, eradication of germs from sputum, the time to patientsβ spontaneous breathing, the time in critical care unit, and mortality were evaluated. Patients were split into 2 groups: Gr.1 (n=48) β systemic antibiotics combined with AC; Gr. 2 (n=42) β systemic antibiotics cross over due to sensitivity. The groups were comparable in main characteristics. Aerosolized colistin was dosed 2 mln. U 3 times/day (Xellia Pharmaceuticals ApS, Denmark) in Gr. 1. The regimen of systemic antibiotic therapy was not changed upon AC prescription. Statistical analysis was carried out using Statistica 7.0 (M, Ο, NewmanβKeuls test; P<0.05).Results. This study has demonstrated efficacy of aerosolized colistin 2 mln. U 3 times/day as adjuvant therapy to systemic antibiotic therapy for NP caused by multidrug-resistant gram-negative germs: the NP resolution rate was 75% (versus 52% in Gr. 2, P=0.0295); eradication of pathogens by therapy day 7 was achieved in 80% in Gr. 1 and 60% Gr. 2 (n=12) (P>0.05); in Gr. 1, spontaneous breathing took place earlier than in Gr. 2 β 7.6Β±1.6 days in Gr. 1 versus 11.7Β±3.4 days in Gr. 2 (P=0.0000); in Gr. 1, the critical care unit duration was shorter than in Gr. 2 β 12.0Β±3.4 days in Gr. 1 versus 16.3Β±3.4 days in Gr. 2 (P=0.0000). Conclusions. Aerosolized colistin 2 mln. U 3 times a day is an effective adjuvant therapy combined with systemic antibiotic therapy for nosocomial pneumonia caused by multidrug-resistant gram-negative germs. This modified treatment assisted faster pneumonia resolution, earlier spontaneous breathing of patients, and shorter time in the intensive care unit. Addition of aerosolized colistin to systemic antibiotics should be regarded as a possible algorithm of treatment in a case of inefficient first-line antibiotic therapy.Π¦Π΅Π»ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡβ ΠΎΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΈΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½Π° (ΠΠ) Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π΄ΠΎΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΠΊ ΡΠΈΡΡΠ΅ΠΌΠ½ΠΎΠΉ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠΎΡΠ΅ΡΠ°ΠΏΠΈΠΈ Π² Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π½ΠΎΠ·ΠΎΠΊΠΎΠΌΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠ½Π΅Π²ΠΌΠΎΠ½ΠΈΠΈ (ΠΠ).ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. Π Π΄Π°Π½Π½ΠΎΠ΅ ΠΎΠ±ΡΠ΅ΡΠ²Π°ΡΠΈΠΎΠ½Π½ΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π±ΡΠ»ΠΎ Π²ΠΊΠ»ΡΡΠ΅Π½ΠΎ 90 ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΠ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΡΠ½ΠΎΠ²Π½ΠΎΠ³ΠΎ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»ΠΈ ΡΠ°Π·ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΠ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π²ΡΠΎΡΠΈΡΠ½ΡΡ
ΠΊΡΠΈΡΠ΅ΡΠΈΠ΅Π² ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΎΡΠ΅Π½ΠΈΠ²Π°Π»ΠΈ ΡΡΠ°Π΄ΠΈΠΊΠ°ΡΠΈΡ Π²ΠΎΠ·Π±ΡΠ΄ΠΈΡΠ΅Π»Π΅ΠΉ ΠΈΠ· ΠΌΠΎΠΊΡΠΎΡΡ, Π²ΡΠ΅ΠΌΡ ΠΏΠ΅ΡΠ΅Π²ΠΎΠ΄Π° Π±ΠΎΠ»ΡΠ½ΡΡ
Π½Π° ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ΅ Π΄ΡΡ
Π°Π½ΠΈΠ΅, Π²ΡΠ΅ΠΌΡ ΠΏΡΠ΅Π±ΡΠ²Π°Π½ΠΈΡ Π² ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ ΠΈ Π»Π΅ΡΠ°Π»ΡΠ½ΠΎΡΡΡ. ΠΠΎΠ»ΡΠ½ΡΡ
Π±ΡΠ»ΠΈ ΡΠ°Π·Π΄Π΅Π»Π΅Π½Ρ Π½Π° 2 Π³ΡΡΠΏΠΏΡ: ΠΡ. 1 (n=48) β Π΄ΠΎΠ±Π°Π²Π»Π΅Π½ΠΈΠ΅ ΠΠ ΠΊ ΡΠΈΡΡΠ΅ΠΌΠ½ΡΠΌ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠ°ΠΌ; ΠΡ. 2 (n=42) β ΡΠΌΠ΅Π½Π° ΡΠΈΡΡΠ΅ΠΌΠ½ΡΡ
Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠΎΠ² Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΡΡΠ²ΡΡΠ²ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡΡ. ΠΡΡΠΏΠΏΡ Π±ΡΠ»ΠΈ ΡΡΠ°Π²Π½ΠΈΠΌΡ ΠΏΠΎ ΠΎΡΠ½ΠΎΠ²Π½ΡΠΌ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ°ΠΌ. ΠΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΡΠΉ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½ Π½Π°Π·Π½Π°ΡΠ°Π»ΠΈ Π² Π΄ΠΎΠ·Π΅ 2 ΠΌΠ»Π½. ΠΠ 3 ΡΠ°Π·Π°/ΡΡΡ. (ΠΡΠ΅Π»Π»ΠΈΡ Π€Π°ΡΠΌΠ°ΡΡΡΡΠΈΠΊΠ°Π»Ρ ΠΠΏΠ‘, ΠΠ°Π½ΠΈΡ) Π² ΠΡ. 1. Π Π΅ΠΆΠΈΠΌ ΡΠΈΡΡΠ΅ΠΌΠ½ΠΎΠΉ Π°Π½ΡΠΈΠ±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΏΡΠΈ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΠΈ ΠΠ Π½Π΅ ΠΌΠ΅Π½ΡΠ»ΠΈ. Π‘ΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· Π²ΡΠΏΠΎΠ»Π½ΠΈΠ»ΠΈ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠ³ΠΎ ΠΏΠ°ΠΊΠ΅ΡΠ° Statistica 7.0 (M, Ο, NewmanβKeuls test; p<0,05).Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π Π΄Π°Π½Π½ΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΠΎΠ²Π°Π»ΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½Π° 2 ΠΌΠ»Π½. ΠΠ 3 Ρ/ΡΡΡ. Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π΄ΠΎΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΠΊ ΡΠΈΡΡΠ΅ΠΌΠ½ΠΎΠΉ Π°Π½ΡΠΈΠ±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΏΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΠΈ ΠΠ, Π²ΡΠ·Π²Π°Π½Π½ΠΎΠΉ ΠΏΠΎΠ»ΠΈΡΠ΅Π·ΠΈΡΡΠ΅Π½ΡΠ½ΡΠΌΠΈ Π³ΡΠ°ΠΌ-ΠΎΡΡΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΠΌΠΈ Π²ΠΎΠ·Π±ΡΠ΄ΠΈΡΠ΅Π»ΡΠΌΠΈ: ΡΠ°ΡΡΠΎΡΠ° ΡΠ°Π·ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΠ ΡΠΎΡΡΠ°Π²ΠΈΠ»Π° 75% (ΠΏΡΠΎΡΠΈΠ² 52% Π² ΠΡ. 2, p=0.0295); ΡΡΠ°Π΄ΠΈΠΊΠ°ΡΠΈΡ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΠΌΠΈΠΊΡΠΎΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠΎΠ² ΠΊ 7-ΠΌ ΡΡΡ. Π»Π΅ΡΠ΅Π½ΠΈΡ Π±ΡΠ»Π° Π΄ΠΎΡΡΠΈΠ³Π½ΡΡΠ° Ρ 80% Π² ΠΡ. 1 ΠΈ Ρ 60% Π² ΠΡ. 2 (n=12) (p>0,05); Π² ΠΡ. 1 ΠΏΠ΅ΡΠ΅Π²ΠΎΠ΄ Π½Π° ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ΅ Π΄ΡΡ
Π°Π½ΠΈΠ΅ Π±ΡΠ» Π²ΡΠΏΠΎΠ»Π½Π΅Π½ ΡΠ°Π½ΡΡΠ΅, ΡΠ΅ΠΌ Π² ΠΡ. 2 β 7,6Β±1,6 ΡΡΡ. Π² ΠΡ. 1 ΠΏΡΠΎΡΠΈΠ² 11,7Β±3,4 ΡΡΡ. Π² ΠΡ. 2 (p=0.0000); Π² ΠΡ. 1 ΡΡΠΎΠΊΠΈ ΠΏΡΠ΅Π±ΡΠ²Π°Π½ΠΈΡ Π² ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ Π±ΡΠ»ΠΈ ΠΌΠ΅Π½ΡΡΠ΅, ΡΠ΅ΠΌ Π² ΠΡ. 2 β 12,0Β±3,4 ΡΡΡ. Π² ΠΡ. 1 ΠΏΡΠΎΡΠΈΠ² 16,3Β±3,4 ΡΡΡ. Π² ΠΡ. 2 (p=0.0000).ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΈΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½Π° 2 ΠΌΠ»Π½. ΠΠ 3 Ρ/ΡΡΡ. ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π΄ΠΎΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΠΊ ΡΠΈΡΡΠ΅ΠΌΠ½ΠΎΠΉ Π°Π½ΡΠΈΠ±Π°ΠΊΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΏΡΠΈ Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π½ΠΎΠ·ΠΎΠΊΠΎΠΌΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠ½Π΅Π²ΠΌΠΎΠ½ΠΈΠΈ, Π²ΡΠ·Π²Π°Π½Π½ΠΎΠΉ ΠΏΠΎΠ»ΠΈΡΠ΅Π·ΠΈΡΡΠ΅Π½ΡΠ½ΡΠΌΠΈ Π³ΡΠ°ΠΌ-ΠΎΡΡΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΠΌΠΈ Π²ΠΎΠ·Π±ΡΠ΄ΠΈΡΠ΅Π»ΡΠΌΠΈ. ΠΠ°Π½Π½ΠΎΠ΅ ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ Π»Π΅ΡΠ΅Π½ΠΈΠ΅ ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΠ΅Ρ Π±ΠΎΠ»Π΅Π΅ Π±ΡΡΡΡΠΎΠΌΡ ΡΠ°Π·ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΠ½Π΅Π²ΠΌΠΎΠ½ΠΈΠΈ, Π±ΠΎΠ»Π΅Π΅ ΡΠ°Π½Π½Π΅ΠΌΡ ΠΏΠ΅ΡΠ΅Π²ΠΎΠ΄Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Π½Π° ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ΅ Π΄ΡΡ
Π°Π½ΠΈΠ΅ ΠΈ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΈΡ ΡΡΠΎΠΊΠΎΠ² ΠΏΡΠ΅Π±ΡΠ²Π°Π½ΠΈΡ Π² ΠΎΡΠ΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠ΅Π°Π½ΠΈΠΌΠ°ΡΠΎΠ»ΠΎΠ³ΠΈΠΈ. ΠΠΎΠ±Π°Π²Π»Π΅Π½ΠΈΠ΅ ΠΈΠ½Π³Π°Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΡΠΈΠ½Π° ΠΊ ΡΠΈΡΡΠ΅ΠΌΠ½ΡΠΌ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠ°ΠΌ ΡΠ»Π΅Π΄ΡΠ΅Ρ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡ ΠΊΠ°ΠΊ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΠΉ Π°Π»Π³ΠΎΡΠΈΡΠΌ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΈ Π½Π΅ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΏΠ΅ΡΠ²ΠΎΠΉ Π»ΠΈΠ½ΠΈΠΈ Π°Π½ΡΠΈΠ±ΠΈΠΎΡΠΈΠΊΠΎΡΠ΅ΡΠ°ΠΏΠΈΠΈ
Thermal Fluctuations of Elastic Filaments with Spontaneous Curvature and Torsion
We study the effects of thermal flucutations on thin elastic filaments with
spontaneous curvature and torsion. We derive analytical expressions for the
orientational correlation functions and for the persistence length of helices,
and find that this length varies non-monotonically with the strength of thermal
fluctuations. In the weak fluctuation regime, the persistence length of a
spontaneously twisted helix has three resonance peaks as a function of the
twist rate. In the limit of strong fluctuations, all memory of the helical
shape is lost.Comment: 1 figur
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