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

Dynamical symmetry breaking of SU(6) GUT in 5-dimensional spacetime with orbifold S1/Z2

The symmetry breaking of 5-dimensional SU(6) GUT into 4-dimensional SU(3) x SU(3) x U(1) with orbifold S1/Z2 through Scherk-Schwarz mechanism is investigated. It is shown that the origin of Little Higgs can be generated to further break SU(3) x SU(3) x U(1) down to the electroweak scale through Higgs mechanism.Comment: 4 page

Proton decay in 5D SU(6) GUT with orbifold S^1/Z_2 breaking in Scherk-Schwarz mechanism

Proton decay within 5-dimensional SU(6) GUT with orbifold S^1/Z_2 breaking is investigated using Scherk-Schwarz mechanism. It is shown that in the model neither leptoquark like heavy gauge bosons nor violation of baryon number conservation are allowed due to the orbifold breaking parity splitting. These results prevent too short proton lifetime within the model.Comment: 6 pages, Proceeding of the Conference in Honour of Murray Gell-Mann's 80th Birthday : Quantum Mechanics, Elementary Particles, Quantum Cosmology, Complexity (2011) 544-54

The thermodynamic properties of Davydov-Scott's protein model in thermal bath

The thermodynamic properties of Davydov-Scott monomer contacting with thermal bath is investigated using Lindblad open quantum system formalism. The Lindblad equation is investigated through path integral method. It is found that the environmental effects contribute destructively to the specific heat, and large interaction between amide-I and amide-site is not preferred for a stable Davydov-Scott monomer.Comment: 8 pages, Proceeding of the Conference in Honour of Murray Gell-Mann's 80th Birthday : Quantum Mechanics, Elementary Particles, Quantum Cosmology and Complexity (2011) 661-66

The thermal denaturation of Peyrard-Bishop model with an external potential

The impact of various types of external potentials to the Peyrard-Bishop DNA denaturation is investigated through statistical mechanics approach. The partition function is obtained using transfer integral method, and further the stretching of hydrogen bond is calculated using time independent perturbation method. It is shown that all types of external potentials accelerate the denaturation processes at lower temperature. In particular, it is argued that the Gaussian potential with infinitesimal width reproduces a constant force at one end of DNA sequence as already done in some previous works.Comment: 11 page

Peluang Perbaikan Varietas Lokal Padi Gogo Pasaman Barat

Local varietyis the major component in upland rice cultivation as well asbreeding material in variety improve-ment. Local upland ricevarieties have been adapted to specific location, preferred andadopted by farmers although they are late in maturity. Thesereasons make it majority of farmers in West Pasaman District(West Sumatra) still cultivate local upland rice varieties. Toknow the yield potential and agronomic characters of widelycultivated of upland rice in West Pasaman District, a varietytrial conducted in 2010. Five local varieties and one improvevariety planted a Randomized complete block arrangementwith three replications. Observa-tion conducted on agronomiccharacters and yield and yield components. The results showedthat local variteies were tall (153-171 cm) and late maturity(130-157 days). The local varieties also showed higher numberof spikelet/panicle (249-454) lighter 1.000 grains weight (<20g) and higher yield than improved variety (4.27-5.51 comparedto 2.85 t/ha). In general all plant characters showed highheritability estimate (except number of productive tiller/hillr).High estimated of genetic variation coefficient and geneticadvance were shown on number of grain per panicle. Based onthese genetic parameters, selection at early generation for highyield can conducted on number of grain per panicle