Dynamics of DNA Bubble in Viscous Medium

The damping effect to the DNA bubble is investigated within the Peyrard-Bishop model. In the continuum limit, the dynamics of the bubble of DNA is described by the damped nonlinear Schrodinger equation and studied by means of variational method. It is shown that the propagation of solitary wave pattern is not vanishing in a non-viscous system. Inversely, the solitary wave vanishes soon as the viscous force is introduced.Comment: 4 pages. arXiv admin note: substantial text overlap with arXiv:1112.471

Effects of lattice variations on confinement in photonic crystal microcavity using green tensor method

Electric field distribution in and around the 2D PC cavity was calculated for different lattice parameters using the Dyson formulation of the Green tensor. The results demonstrate the sensitive effects of structural variation of the photonic crystal on the effectiveness of field confinement in the cavity

When Celebrities Speak: A Nationwide Twitter Experiment Promoting Vaccination in Indonesia

Celebrity endorsements are often sought to influence public opinion. We ask whether celebrity endorsement per se has an effect beyond the fact that their statements are seen by many, and whether on net their statements actually lead people to change their beliefs. To do so, we conducted a nationwide Twitter experiment in Indonesia with 46 high-profile celebrities and organizations, with a total of 7.8 million followers, who agreed to let us randomly tweet or retweet content promoting immunization from their accounts. Our design exploits the structure of what information is passed on along a retweet chain on Twitter to parse reach versus endorsement effects. Endorsements matter: tweets that users can identify as being originated by a celebrity are far more likely to be liked or retweeted by users than similar tweets seen by the same users but without the celebrities' imprimatur. By contrast, explicitly citing sources in the tweets actually reduces diffusion. By randomizing which celebrities tweeted when, we find suggestive evidence that overall exposure to the campaign may influence beliefs about vaccination and knowledge of immunization-seeking behavior by one's network. Taken together, the findings suggest an important role for celebrity endorsement.Comment: 55 pages, 13 tables, 6 figure

Dosimetri Biologik Sitogenetik Pada Liquidator Kecelakaan Chernobyl

CYTOGENETIC BIOLOGICAL DOSIMETRY IN THE LIQUIDATORS OF CHERNOBYLACCIDENT. When human body exposes to ionizing radiation, the most important kind of damage are double strand breaks of DNA. Misrepair of the damages can lead to morphological changes inchromosomes known as chromosomal aberrations. Measurement of chromosome aberrations inblood peripheral lymphocyte cells has been applied to assess dose received by potentiallyoverexposed people and estimate risk for health effects in radiation or nuclear accident cases.Dicentric and translocation are the most important types of chromosome aberrations in biologicaldosimetry or biodosimetry which is usually used when there is no physical dosimetry available or when irradiation dose needs to be confirmed.The cytogenetic screening had been carried out inChernobyl accident for biological doses estimated from dicentric and translocation yields inliquidators (clean-up workers). This paper reviews the cytogenetical biodosimetry application inChernobyl accident liquidators that has proved the worth of the method. Absorbed dose estimatesderived using cytogenetic data and dose response calibration curves are based on the assumption that all individuals have equally respond to radiation