Optical conductivity of ABA stacked graphene trilayer : mid-IR resonance due to band nesting

The band structure and the optical conductivity of an ABA (Bernal-type) stacked graphene trilayer are calculated. It is shown that, under appropriate doping, a strong resonant peak develops in the optical conductivity, located at the frequency corresponding to approximately 1.4 times the interlayer hopping energy and caused by the 'nesting' of two nearly parabolic bands in the electronic spectrum. The intensity of this resonant absorption can be controlled by adjusting the gate voltage. The effect is robust with respect to increasing temperature.Financial support from the COMPETE Programme (FEDER) and the Portuguese Foundation for Science and Technology (FCT) through Projects PEst-C/FIS/UI0607/2013 and PTDC/FIS/113199/2009, as well as MATEPRO Project (ON2 Program) is gratefully acknowledged. ZR thanks the hospitality of the Physics Center of Minho University during her stay in Portugal. YVB, NMRP, RR and MIV acknowledge support by the EC under Graphene Flagship (contract no. CNECT-ICT-604391)

Prevalence and intensity of catastrophic health care expenditures in Iran from 2008 to 2015: a study on Iranian household income and expenditure survey.

BACKGROUND: Households exposure to catastrophic health expenditure is a valuable measure to monitor financial protection in health sector payments. The present study had two aims: first, to estimate the prevalence and intensity of catastrophic health expenditures (CHE) in Iran. Second, to investigate main factors that influence the probability of CHE. METHODS: CHE is defined as an occasion in which a household's out-of-pocket (OOP) spending exceeds 40% of the total income that remains after subtraction of living expenses. This study used the data from eight national repeated cross-sectional surveys on households' income and expenditure. The proportion of households facing CHE, as a prevalence measure, was estimated for rural and urban areas. The intensity of CHE was also calculated using overshoot and mean positive overshoot (MPO) measures. The factors affecting the CHE were also analyzed using logistic random effects regression model. We also used ArcMap 10.1 to display visually disparities across the country. RESULTS: An increasing number of Iranians has been subject to catastrophic health care costs over the study period in both rural and urban areas (CHE = 2.57% in 2008 and 3.25% in 2015). In the same period, the overshoot of CHE and the mean positive overshoot ranged from 0.26% to 0.65% and from 12.26% to 20.86%, respectively. The average absolute monetary value of OOP spending per month has been low in rural areas over the years, but the prevalence of CHE has been higher than urban areas. Generally put, rural settlement, higher income, receiving inpatient and outpatient services, and existence of elderly people in the household led to increase in CHE prevalence (p < 0.05). Interestingly, provinces with more limited geographical and cultural accessibility had the lowest CHE. CONCLUSIONS: According to the findings, Iran's healthcare system has failed to realize the aim of five-year national development plan regarding CHE prevalence (1% CHE prevalence according to the plan). Therefore, revision of financial health care protection policies focusing on pre-payments seems mandatory. For instance, these policies should extend the interventions that target low-income populations particularly in rural areas, provide more coverage for catastrophic medical services in basic benefit packages, and develop supplementary health insurance

Enzymatic Construction of DARPin-Based Targeted Delivery Systems Using Protein Farnesyltransferase and a Capture and Release Strategy

Protein-based conjugates have been extensively utilized in various biotechnological and therapeutic applications. In order to prepare homogeneous conjugates, site-specific modification methods and efficient purification strategies are both critical factors to be considered. The development of general and facile conjugation and purification strategies is therefore highly desirable. Here, we apply a capture and release strategy to create protein conjugates based on Designed Ankyrin Repeat Proteins (DARPins), which are engineered antigen-binding proteins with prominent affinity and selectivity. In this case, DARPins that target the epithelial cell adhesion molecule (EpCAM), a diagnostic cell surface marker for many types of cancer, were employed. The DARPins were first genetically modified with a C-terminal CVIA sequence to install an enzyme recognition site and then labeled with an aldehyde functional group employing protein farnesyltransferase. Using a capture and release strategy, conjugation of the labeled DARPins to a TAMRA fluorophore was achieved with either purified proteins or directly from crude E. coli lysate and used in subsequent flow cytometry and confocal imaging analysis. DARPin-MMAE conjugates were also prepared yielding a construct manifesting an IC$_{50}$ of 1.3 nM for cell killing of EpCAM positive MCF-7 cells. The method described here is broadly applicable to enable the streamlined one-step preparation of protein-based conjugates

System Dynamics modelling to formulate policy interventions to optimise antibiotic prescribing in hospitals

© 2020 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Multiple strategies have been used in the National Health System (NHS) in England to reduce inappropriate antibiotic prescribing and consumption in order to tackle antimicrobial resistance. These strategies have included, among others, restricting dispensing, introduction of prescribing guidelines, use of clinical audit, and performance reviews as well as strategies aimed at changing the prescribing behaviour of clinicians. However, behavioural interventions have had limited effect in optimising doctors’ antibiotic prescribing practices. This study examines the determinants of decision-making for antibiotic prescribing in hospitals in the NHS. A system dynamics model was constructed to capture structural and behavioural influences to simulate doctors’ prescribing practices. Data from the literature, patient records, healthcare professional interviews and survey responses were used to parameterise the model. The scenario simulation shows maximum improvements in guideline compliance are achieved when compliance among senior staff is increased, combined with fast laboratory turnaround of blood cultures, and microbiologist review. Improving guideline compliance of junior staff alone has limited impact. This first use of system dynamics modelling to study antibiotic prescribing decision-making demonstrates the applicability of the methodology for design and evaluation of future policies and interventions.Peer reviewe

Comparison of gene expression during in vivo and in vitro postnatal retina development

Retina explants are widely used as a model of neural development. To define the molecular basis of differences between the development of retina in vivo and in vitro during the early postnatal period, we carried out a series of microarray comparisons using mouse retinas. About 75% of 8,880 expressed genes from retina explants kept the same expression volume and pattern as the retina in vivo. Fewer than 6% of the total gene population was changed at two consecutive time points, and only about 1% genes showed more than a threefold change at any time point studied. Functional Gene Ontology (GO) mapping for both changed and unchanged genes showed similar distribution patterns, except that more genes were changed in the GO clusters of response to stimuli and carbohydrate metabolism. Three distinct expression patterns of genes preferentially expressed in rod photoreceptors were observed in the retina explants. Some genes showed a lag in increased expression, some showed no change, and some continued to have a reduced level of expression. An early downregulation of cyclin D1 in the explanted retina might explain the reduction in numbers of precursors in explanted retina and suggests that external factors are required for maintenance of cyclin D1. The global view of gene profiles presented in this study will help define the molecular changes in retina explants over time and will provide criteria to define future changes that improve this model system

Essential medicines for universal health coverage

Основные лекарства удовлетворяют приоритетные потребности населения в области здравоохранения. Политика, основанная на концепции основных лекарств, имеет решающее значение в улучшении здоровья и достижении устойчивого развития. Цель устойчивого развития 3.8 конкретно упоминает важность «доступности безопасных, эффективных, качественных и доступных по цене основных лекарств и вакцин для всех» в качестве центрального компонента всеобщего охвата медицинской помощью (ВОМП), а цель устойчивого развития 3.b подчёркивает необходимость разработки лекарств для устранения постоянно возникающих пробелов в отношении лечения. Признание важности основных лекарств - не новость. В 1985 г. на конференции в Найроби по рациональному использованию лекарств представители правительств и другие заинтересованные стороны предложили всеобъемлющий комплекс мер по разработке политики в области основных лекарств. Через 30 лет была созвана «Комиссия журнала Ланцет (Lancet) по основным лекарствам» (далее Комиссия) для изучения следующих вопросов: Какого прогресса удалось достичь? Какие проблемы ещё остаются для решения? Какие уроки были извлечены для информирования будущих подходов? И как можно использовать политику в области основных лекарств для продвижения ВОМП и внесения вклада в повестку глобального устойчивого развития? В настоящем докладе рассмотрены эти вопросы с намерением репозиционировать политику в области основных лекарств в повестке глобального развития. Комиссия определила пять областей, имеющих решающее значение для политики в области основных лекарств: оплата корзины основных лекарств, обеспечение ценовой доступности основных лекарств, гарантия их качества и безопасности, мероприятия, способствующие их качественному использованию, и разработка недостающих (отсутствующих) основных лекарств. Комиссия позиционировала политику в области основных лекарств в контексте текущих глобальных дебатов о балансировании политики в области торговли и интеллектуальной собственности с правами человека, об обеспечении безопасности здравоохранения, укреплении систем здравоохранения, ориентированных на людей, и улучшении доступности основных технологий. Во всех областях политики особое внимание было уделено совершенствованию принципов равенства и справедливости в доступе, укреплению соответствующих институтов и созданию подотчётности. В каждой из определённых областей Комиссия сформулировала рекомендации к действию, подтвердив тем самым позицию политики в области основных лекарств в качестве центрального компонента глобального здоровья и здравоохранения и повестки развития