1,721,120 research outputs found
Theta-point universality of polyampholytes with screened interactions
No full textBy an efficient algorithm, we evaluate exactly the disorder-averaged statistics of globally-neutral self-avoiding chains with quenched random charge q(i)= +/-1 in monomer i and nearest neighbor interactions proportional to q(i)q(j) on square (22 monomers) and cubic (16 monomers) lattices. At the Theta transition in two dimensions, the radius of gyration and entropic and crossover exponents are very compatible with the universality class of the corresponding transition of homopolymers. A further strong indication of such a class comes from direct comparison with the corresponding annealed problem. In three dimensions, classical exponents are recovered. The percentage of charge sequences leading to folding in a unique ground state approaches zero exponentially with the chain length
Borrelia burgdorferi-associated primary cutaneous marginal-zone B-cell lymphoma: a case report.
No full text
Sequence randomness and polymer collapse transitions
No full textChain disorder with frustration can modify the universality class of
scaling at the theta transition of heteropolymers. This is shown for a
model with random two-body potentials in 2D on the basis of exact
enumeration and accurate Monte Carlo results. When the average fraction
of repulsive monomer-monomer interactions grows beyond a certain finite
threshold, the temperature below which disorder becomes relevant
coincides with the theta one, and scaling exponents definitely start
deviating from those valid For homopolymers
Psoriatic uveitis is not an exploded myth
No full textPsoriatic uveitis, a distinct clinical entity quoted for 7% to 25% in psoriatic ophthalmic patients with spondyloarthritis, and for 25.,% +/- 2,3 in meta-analysis of rheumatic patients with a prevalence of HLA-B27 quoted as for 40%-50%, is often misdiagnosed. The model proposed by Conti & Coll. [Clinical Dermatology 2017;5(1):30-36]merits also to drive attention of Dermatologist, Radiologist, General Practitioner to submit those psoriatic patients to an ophthalmological screening
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