The use of organic materials presents a tremendous opportunity to significantly impact the functionality and pervasiveness of large-area electronics. Commercialization of this technology requires ...reduction in manufacturing costs by exploiting inexpensive low-temperature deposition and patterning techniques, which typically lead to lower device performance. We report a low-cost approach to control the microstructure of solution-cast acene-based organic thin films through modification of interfacial chemistry. Chemically and selectively tailoring the source/drain contact interface is a novel route to initiating the crystallization of soluble organic semiconductors, leading to the growth on opposing contacts of crystalline films that extend into the transistor channel. This selective crystallization enables us to fabricate high-performance organic thin-film transistors and circuits, and to deterministically study the influence of the microstructure on the device characteristics. By connecting device fabrication to molecular design, we demonstrate that rapid film processing under ambient room conditions and high performance are not mutually exclusive.
Abstract
Introduction
Video consultations have proven to be a powerful support tool for patient–doctor interactions in general, not only during the COVID-19 pandemic. This study analyzed the ...feasibility and usefulness of orthopedic telemedical consultations (OTCs) for orthopedic patients at the interface of a clinic and general practitioners.
Methods
The study was carried out at an orthopedic department of a German hospital between April 2020 and October 2020. After written informed consent was obtained, general practitioners (GPs) of a large adjunct health region could present their patients with orthopedic pathologies to specialists at the hospital via OTCs instead of the usual live consultation (LC). The patients, specialists and GPs were evaluated for their OTC experience and attitude (5-point Likert-scale and open questions, 19 to 27 items).
Results
A total of 89 video consultations took place with 76 patients, 16 GPs and six specialists. The average distance between the GPs/patients and the hospital was 141.9 km. The OTCs were rated as pleasant, and the experience was rated as very satisfying (average Likert-Scale rating, with 5 as strong agreement: specialists = 4.8; GPs = 4.9; patients = 4.7). Following the OTC, a LC was not necessary in 76.4% of cases. Patients with a necessary LC after an OTC showed significantly lower satisfaction with the OTC (
p
= 0.005). Time savings, the elimination of travel and quick contact with orthopedic consultants were positively highlighted by the participants. A total of 123 recommendations for further treatment were given, such as the initiation of physiotherapy/medication and the use of imaging diagnostics. Different technical and organizational challenges could be identified and addressed.
Discussion
The vast majority of the participants stated they had a very positive impression. In particular, the potential savings in travel and time as well as straightforward contact with specialists were rated positively. However, limitations in the assessment of initial presentations of complex medical conditions were also highlighted. Further studies on OTCs with a consultative health professional may show other fields of use for this mode of interdisciplinary remote communication.
It is well accepted that lateral redistribution of the phytohormone auxin underlies the bending of plant organs towards light. In monocots, photoreception occurs at the shoot tip above the region of ...differential growth. Despite more than a century of research, it is still unresolved how light regulates auxin distribution and where this occurs in dicots. Here, we establish a system in Arabidopsis thaliana to study hypocotyl phototropism in the absence of developmental events associated with seedling photomorphogenesis. We show that auxin redistribution to the epidermal sites of action occurs at and above the hypocotyl apex, not at the elongation zone. Within this region, we identify the auxin efflux transporter ATP-BINDING CASSETTE B19 (ABCB19) as a substrate target for the photoreceptor kinase PHOTOTROPIN 1 (phot1). Heterologous expression and physiological analyses indicate that phosphorylation of ABCB19 by phot1 inhibits its efflux activity, thereby increasing auxin levels in and above the hypocotyl apex to halt vertical growth and prime lateral fluxes that are subsequently channeled to the elongation zone by PIN-FORMED 3 (PIN3). Together, these results provide new insights into the roles of ABCB19 and PIN3 in establishing phototropic curvatures and demonstrate that the proximity of light perception and differential phototropic growth is conserved in angiosperms.
The generation of patient-specific pluripotent stem cells has the potential to accelerate the implementation of stem cells for clinical treatment of degenerative diseases. Technologies including ...somatic cell nuclear transfer and cell fusion might generate such cells but are hindered by issues that might prevent them from being used clinically. Here, we describe methods to use dermal fibroblasts easily obtained from an individual human to generate human induced pluripotent stem (iPS) cells by ectopic expression of the defined transcription factors KLF4, OCT4, SOX2, and C-MYC. The resultant cell lines are morphologically indistinguishable from human embryonic stem cells (HESC) generated from the inner cell mass of a human preimplantation embryo. Consistent with these observations, human iPS cells share a nearly identical gene-expression profile with two established HESC lines. Importantly, DNA fingerprinting indicates that the human iPS cells were derived from the donor material and are not a result of contamination. Karyotypic analyses demonstrate that reprogramming of human cells by defined factors does not induce, or require, chromosomal abnormalities. Finally, we provide evidence that human iPS cells can be induced to differentiate along lineages representative of the three embryonic germ layers indicating the pluripotency of these cells. Our findings are an important step toward manipulating somatic human cells to generate an unlimited supply of patient-specific pluripotent stem cells. In the future, the use of defined factors to change cell fate may be the key to routine nuclear reprogramming of human somatic cells.
Abstract
EpiScanpy is a toolkit for the analysis of single-cell epigenomic data, namely single-cell DNA methylation and single-cell ATAC-seq data. To address the modality specific challenges from ...epigenomics data, epiScanpy quantifies the epigenome using multiple feature space constructions and builds a nearest neighbour graph using epigenomic distance between cells. EpiScanpy makes the many existing scRNA-seq workflows from scanpy available to large-scale single-cell data from other -omics modalities, including methods for common clustering, dimension reduction, cell type identification and trajectory learning techniques, as well as an atlas integration tool for scATAC-seq datasets. The toolkit also features numerous useful downstream functions, such as differential methylation and differential openness calling, mapping epigenomic features of interest to their nearest gene, or constructing gene activity matrices using chromatin openness. We successfully benchmark epiScanpy against other scATAC-seq analysis tools and show its outperformance at discriminating cell types.
The oxygen isotope ratio (delta 18O) of cellulose is thought to provide a record of ambient temperature and relative humidity during periods of carbon assimilation. Here we introduce a method to ...resolve tree-canopy leaf temperature with the use of delta 18O of cellulose in 39 tree species. We show a remarkably constant leaf temperature of 21.4 +/- 2.2 °C across 50° of latitude, from subtropical to boreal biomes. This means that when carbon assimilation is maximal, the physiological and morphological properties of tree branches serve to raise leaf temperature above air temperature to a much greater extent in more northern latitudes. A main assumption underlying the use of delta 18O to reconstruct climate history is that the temperature and relative humidity of an actively photosynthesizing leaf are the same as those of the surrounding air. Our data are contrary to that assumption and show that plant physiological ecology must be considered when reconstructing climate through isotope analysis. Furthermore, our results may explain why climate has only a modest effect on leaf economic traits in general.
Changes in cholesterol content of neuronal membranes occur during development and brain aging. Little is known about whether synaptic activity regulates cholesterol levels in neuronal membranes and ...whether these changes affect neuronal development and function. We generated transgenic flies that express the cholesterol-binding D4H domain of perfringolysin O toxin and found increased levels of cholesterol in presynaptic terminals of Drosophila larval neuromuscular junctions following increased synaptic activity. Reduced cholesterol impaired synaptic growth and largely prevented activity-dependent synaptic growth. Presynaptic knockdown of adenylyl cyclase phenocopied the impaired synaptic growth caused by reducing cholesterol. Furthermore, the effects of knocking down adenylyl cyclase and reducing cholesterol were not additive, suggesting that they function in the same pathway. Increasing cAMP levels using a dunce mutant with reduced phosphodiesterase activity failed to rescue this impaired synaptic growth, suggesting that cholesterol functions downstream of cAMP. We used a protein kinase A (PKA) sensor to show that reducing cholesterol levels reduced presynaptic PKA activity. Collectively, our results demonstrate that enhanced synaptic activity increased cholesterol levels in presynaptic terminals and that these changes likely activate the cAMP-PKA pathway during activity-dependent growth.
Background
An estimated 43% of children younger than 5 years of age are at elevated risk of failing to achieve their human potential. In response, the World Health Organization and UNICEF developed ...Care for Child Development (CCD), based on the science of child development, to improve sensitive and responsive caregiving and promote the psychosocial development of young children.
Methods
In 2015, the World Health Organization and UNICEF identified sites where CCD has been implemented and sustained. The sites were surveyed, and responses were followed up by phone interviews. Project reports provided information on additional sites, and a review of published studies was undertaken to document the effectiveness of CCD for improving child and family outcomes, as well as its feasibility for implementation in resource‐constrained communities.
Results
The inventory found that CCD had been integrated into existing services in diverse sectors in 19 countries and 23 sites, including child survival, health, nutrition, infant day care, early education, family and child protection and services for children with disabilities. Published and unpublished evaluations have found that CCD interventions can improve child development, growth and health, as well as responsive caregiving. It has also been reported to reduce maternal depression, a known risk factor for poor pregnancy outcomes and poor child health, growth and development. Although CCD has expanded beyond initial implementation sites, only three countries reported having national policy support for integrating CCD into health or other services.
Conclusions
Strong interest exists in many countries to move beyond child survival to protect and support optimal child development. The United Nations Sustainable Development Goals depend on children realizing their potential to build healthy and emotionally, cognitively and socially competent future generations. More studies are needed to guide the integration of the CCD approach under different conditions. Nevertheless, the time is right to provide for the scale‐up of CCD as part of services for families and children.
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