Liquid-Crystal-Enabled Active Plasmonics: A Review

Liquid crystals are a promising candidate for development of active plasmonics due to their large birefringence, low driving threshold, and versatile driving methods. We review recent progress on the interdisciplinary research field of liquid crystal based plasmonics. The research scope of this field is to build the next generation of reconfigurable plasmonic devices by combining liquid crystals with plasmonic nanostructures. Various active plasmonic devices, such as switches, modulators, color filters, absorbers, have been demonstrated. This review is structured to cover active plasmonic devices from two aspects: functionalities and driven methods. We hope this review would provide basic knowledge for a new researcher to get familiar with the field, and serve as a reference for experienced researchers to keep up the current research trends.     

Graft-versus-host disease after liver transplantation is associated with bone marrow failure,hemophagocytosis, and DNMT3A mutations

Graft-versus-host disease after liver transplantation (LT-GVHD) is rare, frequently fatal, and associated with bone marrow failure (BMF), cytopenias, and hyperferritinemia. Given hyperferritinemia and cytopenias are present in hemophagocytic lymphohistiocytosis (HLH), and somatic mutations in hematopoietic cells are associated with hyperinflammatory responses (clonal hematopoiesis of indeterminate potential, CHIP), we identified the frequency of hemophagocytosis and CHIP mutations in LT-GVHD. We reviewed bone marrow aspirates and biopsies, quantified blood/marrow chimerism, and performed next-generation sequencing (NGS) with a targeted panel of genes relevant to myeloid malignancies, CHIP, and BMF. In all, 12 marrows were reviewed from 9 LT-GVHD patients. In all, 10 aspirates were evaluable for hemophagocytosis; 7 had adequate DNA for NGS. NGS was also performed on marrow from an LT cohort (n = 6) without GVHD. Nine of 10 aspirates in LT-GVHD patients showed increased hemophagocytosis. Five (71%) of 7 with LT-GVHD had DNMT3A mutations; only 1 of 6 in the non-GVHD LT cohort demonstrated DNMT3A mutation (p = .04). Only 1 LT-GVHD patient survived. BMF with HLH features was associated with poor hematopoietic recovery, and DNMT3A mutations were over-represented, in LT-GVHD patients. Identification of HLH features may guide prognosis and therapeutics. Further studies are needed to clarify the origin and impact of CHIP mutations on the hyperinflammatory state.

     

Progesterone support in IVF: is evidence-based medicine translated to clinical practice? A worldwide web-based survey

This worldwide web-based survey compared the clinical practice for luteal-phase supplementation (LPS) in stimulated IVF cycles to the current evidence-based literature. Eighty-four treatment centres in 35 countries, representing a total of 51,155 IVF cycles/year, responded. Vaginal progesterone alone was used for LPS in 64% of cycles and in another 16% of cycles in combination with either i.m. (15%) or oral progesterone (1%). As a single agent, i.m. progesterone was used in 13% of cycles, oral progesterone in another 2% and human chorionic gonadotrophin (HCG) was still used in 5% of cycles. Progesterone was administered until 10–12 weeks’ gestation in 67% of cycles and in 22% and 12% it was discontinued when fetal heart pulsations are recognized or until βHCG was positive, respectively. In conclusion, in almost two-thirds of the assisted cycles represented in this survey, vaginal administration of progesterone is preferred for LPS. Nevertheless, despite the available literature on the disadvantages of oral progesterone, i.m. progesterone and HCG for LPS, these agents are still used routinely by many practitioners. Furthermore, although there is no firm evidence to support the continuation of LPS until 10–12 weeks’ gestation, this practice is used in the majority of IVF cycles worldwide.This worldwide web-based survey assessed the clinical practice for luteal-phase support in stimulated cycles in comparison to the current evidence-based literature. The survey included the following questions: (i) ‘What is the progesterone you use for luteal support?’; and (ii) ‘How long does progesterone needs to be administered in an IVF cycle if the patient becomes pregnant?’. Eighty-four units from 35 countries representing a total of 51,155 treated IVF cycles/year were included. Vaginal progesterone alone was used for luteal-phase supplementation in 64% of cycles. In another 16% of cycles, vaginal progesterone was used in combination with either intramuscular (15%) or oral progesterone (1%). As a single agent, intramuscular progesterone was used in 13% of cycles, oral progesterone in another 2%, and human chorionic gonadotrophin (HCG) was still used in 5% of cycles. Progesterone was administered until 10–12 weeks’ gestation in 67% of cycles, in 22% of cycles it was discontinued when fetal heart pulsations are recognized, and in 12% it was administered until a positive pregnancy test. In conclusion, in agreement with the currently available literature, in almost two-thirds of assisted cycles worldwide, the vaginal route of progesterone administration is preferred for luteal-phase supplementation. Nevertheless, despite the described disadvantages of oral progesterone, intramuscular progesterone and HCG for LPS, these agents are still used routinely in clinical practice by many practitioners. Furthermore, although there is no firm evidence to support the continuation of LPS until 10–12 weeks of gestation, this practice is used in the majority of IVF cycles worldwide.     

Shear Wave Elastography: A Review on the Confounding Factors and Their Potential Mitigation in Detecting Chronic Kidney Disease

Early detection of chronic kidney disease is important to prevent progression of irreversible kidney damage, reducing the need for renal transplantation. Shear wave elastography is ideal as a quantitative imaging modality to detect chronic kidney disease because of its non-invasive nature, low cost and portability, making it highly accessible. However, the complexity of the kidney architecture and its tissue properties give rise to various confounding factors that affect the reliability of shear wave elastography in detecting chronic kidney disease, thus limiting its application to clinical trials. The objective of this review is to highlight the confounding factors presented by the complex properties of the kidney, in addition to outlining potential mitigation strategies, along with the prospect of increasing the versatility and reliability of shear wave elastography in detecting chronic kidney disease.     

Imagining Consequences of Excessive Smartphone Use via a Character-Based Mobile Application

Excessive use of smartphones or other electronic screen products and the associated symptoms of addiction among youngsters have sparked concerns. This study explores possibilities of preventing adolescents or young adults from excessive smartphone use via a character-based mobile application stimulating their imagination and reflection. The character responds contingently to a user’s act of switching on or off the screen, causing one to associate the effects on the character with excessive use. This approach, grounded in the embodied cognition thesis, combines behavior with imaginative consequences for one to experience, which combat the rewarding neural pathways activated in addictive behaviors. The application was deployed in a field trial. Each participant’s usage was tracked via automated logging, and cognitive responses were probed through in-depth interviews. Interview data were analyzed, followed by comparison with logged data. Overall, about half of the participants attributed imaginative consequences to their ways of using phones. One third of the participants showed evidence of positive change in using phones. These two groups substantially overlapped. The results suggest that experientially grounded association of virtual consequences with physical acts could correlate with behavior change. Using figurative representation as feedback could be promising in supporting individuals for healthy habits.     

Conditional ligands for Asian HLA variants facilitate the definition of CD8+ T‐cell responses in acute and chronic viral diseases

Conditional ligands have enabled the high‐throughput production of human leukocyte antigen (HLA) libraries that present defined peptides. Immunomonitoring platforms typically concentrate on restriction elements associated with European ancestry, and such tools are scarce for Asian HLA variants. We report 30 novel irradiation‐sensitive ligands, specifically targeting South East Asian populations, which provide 93, 63, and 79% coverage for HLA‐A, ‐B, and ‐C, respectively. Unique ligands for all 16 HLA types were constructed to provide the desired soluble HLA product in sufficient yield. Peptide exchange was accomplished for all variants as demonstrated by an ELISA‐based MHC stability assay. HLA tetramers with redirected specificity could detect antigen‐specific CD8⁺ T‐cell responses against human cytomegalovirus, hepatitis B (HBV), dengue virus (DENV), and Epstein‐Barr virus (EBV) infections. The potential of this population‐centric HLA library was demonstrated with the characterization of seven novel T‐cell epitopes from severe acute respiratory syndrome coronavirus, HBV, and DENV. Posthoc analysis revealed that the majority of responses would be more readily identified by our unbiased discovery approach than through the application of state‐of‐the‐art epitope prediction. This flow cytometry‐based technology therefore holds considerable promise for monitoring clinically relevant antigen‐specific T‐cell responses in populations of distinct ethnicity.