Hernia or hernia Defect? Experimental herniology Models in Laboratory Animals

Hernias of the anterior abdominal wall remain one of the most common surgery pathologies. There is no unified approach to modeling anterior abdominal wall hernias in the world scientific community. In order to systematize the available knowledge in this field and to contribute to the formation of a unified idea of how to create a hernia model in a laboratory animal, it seems logical to study the accumulated experience of researchers in the field of experimental herniology. We found out that hernia defects generally modeled on male laboratory rats. To understand the tissue reaction to the prosthetic material a fenestration was performed in the anterior abdominal wall (including peritoneum) except for the skin and subcutaneous fat. A replacement or prosthetic material tailored to the fenestration was sutured end-to-end into the abdominal wall. We chose laboratory rats because they are easy to take care of and cheaper than larger laboratory animals

Localized Surface Plasmon Resonance in Metamaterials Composed of As_1−<i>z</i>Sb_<i>z</i> Semimetal Nanoparticles in Al_<i>x</i>Ga_1−<i>x</i>As_1−<i>y</i>Sb_<i>y</i> Semiconductor Matrix

We analyze the possibility to realize a localized surface plasmon resonance in metamaterials composed of As1−zSbz nanoparticles embedded in an AlxGa1−xAs1−ySby semiconductor matrix. To this end, we perform ab initio calculations of the dielectric function of the As1−zSbz materials. Changing the chemical composition z, we trace the evolution of the band structure, dielectric function, and loss function. In terms of the Mie theory, we calculate the polarizability and optical extinction of a system of As1−zSbz nanoparticles in an AlxGa1−xAs1−ySby environment. We show a possibility to provide localized surface plasmon resonance near the band gap of the AlxGa1−xAs1−ySby semiconductor matrix by a built-in system of As1−zSbz nanoparticles strongly enriched by Sb. The results of our calculations are supported by available experimental data