Do not let the dead bite! : different scenarios of the zombie epidemic reexamined

The Zombie Epidemic is a fun framework for investigating different scenarios of spreading disease. An extended Kermack - McKendrick model is analyzed. The only thing that can save humanity is to not get bitten or to find a remedy for the "zombie virus" (both almost impossible)

In silico study of liquid crystalline phases formed by bent-shaped molecules with excluded volume type interactions

What impact does the mesogens’ shape have on the formation of the liquid crystalline phase? Using Monte Carlo and molecular dynamics simulations we numerically studied a liquid composed of achiral, bent-shaped molecules built of tangent spheres. The system is known to spontaneously break mirror symmetry, as it forms a macroscopically chiral, twist-bend nematic phase [Phys. Rev. Lett. 115, 147801 (2015)]. We examined a full phase diagram by altering the molecules’ curvature along with packing fractions and observed several phases characterized by the orientational and/or translational ordering of molecules. Apart from conventional nematic, smectic A, and the aforementioned twist-bend nematic phase, we identified splay-bend smectic phase. For large densities and strongly curved molecules, another smectic phase emerged, where the polarization vector rotates within a single smectic layer

Studies of new antiferroelectric liquid crystal based on quantum-chemical model

Physical properties of new thermotropic antiferroelectric liquid crystal have been studied. Experiments were done by use of complementary methods such as differential scanning calorimetry, polarizing optical microscopy and X-ray powder diffractometry. Acquired data from X-ray powder diffractometry was examined under application of quantum chemical approach. It has been found that compound studied exhibits stable enantiotropic antiferroelectric SmC_{A}^{*} phase in the wide temperature range while ferroelectric phase SmC^{*} is very narrow

Assessment of dental caries among children and adults inhabiting Starorypin (11th–12th c.) compared to other Early Medieval populations from Poland

Dental caries testing provides information about diet, hygiene and eating habits. This information can be useful in reconstructing the living conditions of historical populations. The aim of this study was to determine the frequency of dental caries in adults and children in the Early Middle Ages population from Starorypin (Poland) and compare the results with other early medieval populations from Poland.A total of 346 adult permanent teeth and 131 deciduous teeth were included in the study. Both the macroscopic method and imaging methods (X-ray and a light-induced fluorescence technique) were applied in the study.Dental caries were recorded in 33% (115/346) of the permanent teeth and in 10% (13/131) of the deciduous teeth. In permanent teeth, dental caries were diagnosed on the approximal surface, while dental caries in deciduous teeth are most often diagnosed on the occlusal surface. Early childhood caries (ECC) were mainly diagnosed on the teeth of individuals within the 3.0–5.5 years age group.The frequency of dental caries seemed to be high compared to other early medieval populations. The obtained results may have been influenced by ‘broadband’ odontological research methods, not limited to the macroscopic method alone. However, it can be also argued that the frequency of dental caries observed in this study might have been influenced by a highly varied diet, as indicated by archaeozoological and archaeobotanical studies. The surfaces affected by dental caries correspond to findings of other studies showing that in adults, these were the approximal surfaces, while they were the labial/occlusion surfaces on the deciduous teeth

Indication and discussion of flaws in "Properties of binary mixtures derived from hydrogen bonded liquid crystals" by M. Fouzai et al. [J. Mol. Liq. 249 (2018) 1279-1286]

This Letter comprises comments, in brief form, about the doubtful results from dielectric spectroscopy measurements and drawbacks in data presentation in the paper by M. Fouzai et al. [J. Mol. Liq. 249 (2018) 1279-1286]

Comments on the published article "The effect of optical purity on the coexistence phenomenon and on the polarization - electric field hysteresis behavior in SmC* and SmC*A phases" by M. Chemingui et al., Journal of Molecular Liquids, 222 (2016) 1101-1108

This letter concerns error in assumed theoretical model and incorrect interpretation and presentation of experimental data in the article by M. Chemingui et al., “The effect of optical purity on the coexistence phenomenon and on the polarization – electric field hysteresis behavior in SmC* and SmC*A phases”, Journal of Molecular Liquids, 222 (2016) 1101–1108

Comment on the published article "Dichroic ratio and order parameters of some sudan dyes doped in nematic liquid crystalline matrix" by A. Maleki et al., Optik, 126 (2015) 5473-5477

This short note concerns the error in the article by A. Maleki et al., "Dichroic ratio and order parameters of some sudan dyes doped in nematic liquid crystalline matrix", Optik, 126 (2015) 5473-5477

Comments on the published article "Dielectric anisotropy, refractive indices and order parameter of W-1680 nematic liquid crystal" by M. S. Zakerhamidi et al., Journal of Molecular Liquids, 181 (2013) 77-81

This letter concerns misleading content and discrepancies in the article by M. S. Zakerhamidi et al., “Dielectric anisotropy, refractive indices and order parameter of W–1680 nematic liquid crystal”, Journal of Molecular Liquids, 181 (2013) 77–81