Out-of-phase mixed holographic gratings: a quantative analysis

We show, that by performing a simultaneous analysis of the angular dependencies of the +/- first and the zeroth diffraction orders of mixed holographic gratings, each of the relevant parameters can be obtained: the strength of the phase grating and the amplitude grating, respectively, as well as a potential phase between them. Experiments on a pure lithium niobate crystal are used to demonstrate the applicability of the analysis.Comment: CORRECTION of Equation (1) and (2) (crucial typo

The Role of Teamwork in the Creation of Open Educational Resources for Closing SDG-Related Knowledge Gaps

The Sustainable Development Goals (SDGs) with their interconnected targets can only be achieved if their interactions are seriously taken into consideration. Education for sustainability is crucial for raising awareness of different stakeholders about the SDGs and their interactions. The paper discusses how teamwork creation of Open Educational Resources (OER), with their specific benefits, can contribute to closing knowledge gaps about the SDGs and their interactions. The example of OE4BW (Open Education for a Better World) international mentoring program and its energy-related hub, called the SDG7 Hub is presented and discussed, and its future development, targeting the creation of OER to close the SDG7-related knowledge gaps, is suggested. The resulting guidelines are generalized to provide a further increase of OER’s contribution to the achievement of SDGs

Guanosine Quadruplexes in Solution: A Small-Angle X-Ray Scattering Analysis of Temperature Effects on Self-Assembling of Deoxyguanosine Monophosphate

We investigated quadruplex formation in aqueous solutions of 2′-deoxyriboguanosine 5′-monophosphate, d(pG), which takes place in the absence of the covalent axial backbone. A series of in-solution small angle X-ray scattering experiments on d(pG) have been performed as a function of temperature in the absence of excess salt, at a concentration just above the critical one at which self-assembling occurs. A global fit approach has been used to derive composition and size distribution of the scattering particles as a function of temperature. The obtained results give thermodynamical justification for the observed phase-behavior, indicating that octamer formation is essential for quadruplex elongation. Our investigation shows that d(pG) quadruplexes are very suitable to assess the potential of G-quadruplex formation and to study the self-assembling thermodynamics

Topological Interface-State Lasing in a Polymer-Cholesteric Liquid Crystal Superlattice

The advance of topological photonics has heralded a revolution for manipulating light as well as for the development of novel photonic devices such as topological insulator lasers. Here, we demonstrate topological lasing of circular polarization in a polymer-cholesteric liquid crystal (P-CLC) superlattice, tunable in the visible wavelength regime. By use of the femtosecond-laser direct-writing and self-assembling techniques, we establish the P-CLC superlattice with a controlled mini-band structure and a topological interface defect, thereby achieving a low threshold for robust topological lasing at about 0.4 uJ. Thanks to the chiral liquid crystal, not only the emission wavelength is thermally tuned, but the circularly polarized lasing is readily achieved. Our results bring about the possibility to realize compact and integrated topological photonic devices at low cost, as well as to engineer an ideal platform for exploring topological physics that involves light-matter interaction in soft-matter environments.Comment: 14 pages, 4 figure

Tuneable Multicoloured Patterns From Photonic Cross Communication Between Cholesteric Liquid Crystal Droplets

Monodisperse droplets of planar-aligned cholesteric (N*) liquid crystal exhibit an intriguing capacity for photonic cross-communication, giving rise to colourful patterns that depend sensitively on the N* pitch, droplet positions and illuminated area. The phenomenon results from a combination of omnidirectional selective reflection of N* droplets—which thus act as spherically symmetric self-assembled photonic crystals—and total internal reflection at the continuous phase surface. We outline how the unique optical properties can be employed in numerous applications

Elucidating the fine details of cholesteric liquid crystal shell reflection patterns

Clusters of planar-aligned short-pitch cholesteric liquid crystal spheres generate dynamic colourful patterns due to multiple selective reflections from the radially oriented cholesteric helices in neighbour shells at varying distances. These photonic communication patterns were widely investigated for the cases of both droplets and shells, demonstrating not only intriguing optical phenomena but also potential for applications as new optical elements for photonics, sensing or security pattern generation. However, the optics of these clusters is truly complex and until now only the strongest and most fundamental reflections have been analysed and explained. In this report, we elucidate the origin of a number of more subtle reflections and we explain the extension in space of various spots as well as their internal colour variations

Translation and pilot study of the Cleft Hearing Appearance and Speech Questionnaire (CHASQ)

BackgroundThere has been a lack of a standardized protocol for collection of patient reported outcomes (PRO) and detection of and indication for psychological treatment in cleft care. The objectives of this paper was to translate Cleft Hearing Appearance and Speech Questionnaire (CHASQ) into eight European languages, to investigate whether levels of PRO in patients with cleft lip and/or cleft palate (CL/P) were comparable across countries and to investigate clinician experience of the instrument.MethodsThe PRO measure—CHASQ—was translated into Bulgarian, Estonian, Greek, Latvian, Macedonian, Romanian, Serbian and Swedish and implemented with patients in the respective countries. A focus group discussion was conducted to investigate health care professional experience on the use of CHASQ in their clinics. Data was analysed in accordance with the principles of thematic analysis.ResultsAnalysis showed statistically significant differences between countries and groups of diagnosis in CHASQ scores. CHASQ helped clinicians gain patient information and informed on treatment decisions, broadened the clinicians’ role as caregivers and was perceived as short and easy to use. Limited time and resources in clinics were limitations in implementing the instrument.ConclusionsTranslation and utilization of CHASQ facilitated international comparison and cooperation. Linguistically, valid replicas of CHASQ are now available in many European languages. Results from this study show that CHASQ may be used for collection of PRO on patient satisfaction and to spark conversation between clinicians, patients and families

DET1-mediated degradation of a SAGA-like deubiquitination module controls H2Bub homeostasis

DE-ETIOLATED 1 (DET1) is an evolutionarily conserved component of the ubiquitination machinery that mediates the destabilization of key regulators of cell differentiation and proliferation in multicellular organisms. In this study, we provide evidence from Arabidopsis that DET1 is essential for the regulation of histone H2B monoubiquitination (H2Bub) over most genes by controlling the stability of a deubiquitination module (DUBm). In contrast with yeast and metazoan DUB modules that are associated with the large SAGA complex, the Arabidopsis DUBm only comprises three proteins (hereafter named SGF11, ENY2 and UBP22) and appears to act independently as a major H2Bub deubiquitinase activity. Our study further unveils that DET1-DDB1-Associated-1 (DDA1) protein interacts with SGF11 in vivo, linking the DET1 complex to light-dependent ubiquitin-mediated proteolytic degradation of the DUBm. Collectively, these findings uncover a signaling path controlling DUBm availability, potentially adjusting H2Bub turnover capacity to the cell transcriptional status