On the number of contacts of a floating polymer chain cross-linked with a surface adsorbed chain on fractal structures

We study the interaction problem of a linear polymer chain, floating in fractal containers that belong to the three-dimensional Sierpinski gasket (3D SG) family of fractals, with a surface-adsorbed linear polymer chain. Each member of the 3D SG fractal family has a fractal impenetrable 2D adsorbing surface, which appears to be 2D SG fractal. The two-polymer system is modelled by two mutually crossing self-avoiding walks. By applying the Monte Carlo Renormalization Group (MCRG) method, we calculate the critical exponents $\phi$, associated with the number of contacts of the 3D SG floating polymer chain, and the 2D SG adsorbed polymer chain, for a sequence of SG fractals with $2\le b\le 40$. Besides, we propose the codimension additivity (CA) argument formula for $\phi$, and compare its predictions with our reliable set of the MCRG data. We find that $\phi$ monotonically decreases with increasing $b$, that is, with increase of the container fractal dimension. Finally, we discuss the relations between different contact exponents, and analyze their possible behaviour in the fractal-to-Euclidean crossover region $b\to\infty$.Comment: 15 pages, 3 figure

Antioxidant biomarker profile of chironomid larvae from carp ponds: Evaluation of the effects of different fish feeding patterns

A 102-day feeding trial was conducted to evaluate the effects of four different fish feeding patterns on carp pond water quality and antioxidant biomarkers [superoxide dismutase (SOD), Catalase (CAT), Glutathione peroxidase (GPx), Glutathione reductase (GR), Glutathione S-transferase (GST) and Thiol groups (SH)], protein content and biomass of the midge Chironomus plumosus. Farmed fish were fed two commercial diets: Soprofish 25/7 Standard (containing 25% protein and 7 % fat) and Soprofish 32/7 Profi Effect (containing 32 % protein and 7 % fat). These feeds were combined during a feeding trial in four different feeding patterns, designated as A, B, C and D. In feeding pattern A, the fish received Soprofish 25/7 Standard throughout the experiment and in feeding pattern D, Soprofish 32/7 Profi Effect. During feeding patterns B and C, a mixed feeding pattern was used, alternating between lower and higher protein diets. The study revealed no significant effects (P > 0.05) of the feeding regimens on water quality, so their effects on C. plumosus larvae can be evaluated independently. The activities of the chironomid enzymes CAT and GR showed a clear statistically significant dependence on the feeding pattern (P 0.05). Overall, our results suggest that long-term supplementation with a highly concentrated protein diet may have preventive effects against oxidative stress and support the use of C. plumosus as a model for assessing the effects of organic pollution on pond zoobenthic fauna. © 202

Hibridna traheotomija u vrijeme hibridnih automobila i hibridnih kongresa - ima li mjesto u COVID-19 jedinicama intenzivnog liječenja?

Pandemija COVID-19 postavila je velike izazove pred liječnike u cijelom svijetu. Riziku infekcije osobito su izloženi otorinolaringolozi, a traheotomija predstavlja jednu od najrizičnijih operacija. U radu se opisuje tehnika hibridne traheotomije koju su autori uočili čitajući literaturu o traheotomijama, te prednosti i nedostaci iste

Traheotomija u COVID doba, OB Dubrovnik

Od prvog COVID bolesnika koji je u OB Dubrovnik primljen 26.3.2020., do 31.3.2021., u COVID JIL- u liječeno je 166 bolesnika. U radu se opisuje tijek liječenja, potreba za kirurškim liječenjem, te koordinacija tima pri izvođenju traheotomije. Tim je činio anesteziolog, dva otorinolaringologa, anesteziološki tehničar i dvije ORL instrumentarke. U radu se analiziraju mjere zaštite, komplikacije i rezultati liječenja. U promatranom razdoblju niti jedan ORL liječnik, ni sestra instrumentarka nisu bili zaraženi COVID -19

On the number of contacts of two polymer chains situated on fractal structures

We study the critical behavior of the number of monomer-monomer contacts for two polymers in a good solvent. Polymers are modeled by two self-avoiding walks situated on fractals that belong to the checkerboard (CB) and X family. Each member of a family is labeled by an odd integer b, $3\le b\le\infty$ . By applying the exact Renormalization Group (RG) method, we establish the relevant phase diagrams whereby we calculate the contact critical exponents $\varphi$ (for the CB and X fractals with b=5 and b=7). The critical exponent $\varphi$ is associated with power law of the number of sites at which the two polymers are touching each other. Copyright Springer-Verlag Berlin/Heidelberg 2004