Search results

Filter

Filetype

Your search for "*" yielded 533615 hits

Research communication in the climate crisis : Open letters and the mobilization of information

What happens to researchers when the topic they study poses an existential threat to the world as we know it? When communication on the topic is politically polarized, but at the same time institutionally encouraged and existentially needed? By what means do researchers come to navigate this complex communication environment? The climate crisis and changing social, political, and academic conditio

Space tourism : Do age and gender make a difference in risk perception?

Space tourism is an industry with risks including health and safety, space debris, biological hazards, and sustainability concerns. However, there is limited research on the perceived risk of participation in space tourism, particularly regarding age and gender differences. An integrated research model was created and tested with four perceived risk dimensions using fuzzy-set Qualitative Comparati

Delayed intracranial hemorrhage after head trauma seems rare and rarely needs intervention—even in antiplatelet or anticoagulation therapy

Background: Traumatic brain injury causes morbidity, mortality, and at least 2,500,000 yearly emergency department visits in the USA. Computerized tomography of the head is the gold standard to detect traumatic intracranial hemorrhage. Some are not diagnosed at the first scan, and they are denoted “delayed intracranial hemorrhages. ” To detect these delayed hemorrhages, current guidelines for head

A 3D study of the relationship between leaf vein structure and mechanical function

We investigate the structures and mechanical properties of leaf midribs of Ficus microcarpa and Prunus dulcis, which deposit calcium oxalate crystals, and of Olea europaea midribs which contain no mineral deposits, but do contain lignified fibers. The midrib mechanical performance contributes to the leaf's ability to maintain a flat conformation for light harvesting and to efficiently reconfigure

Mineral Deposits in Ficus Leaves : Morphologies and Locations in Relation to Function

Ficus trees are adapted to diverse environments and have some of the highest rates of photosynthesis among trees. Ficus leaves can deposit one or more of the three major mineral types found in leaves: amorphous calcium carbonate cystoliths, calcium oxalates, and silica phytoliths. In order to better understand the functions of these minerals and the control that the leaf exerts over mineral deposi

Plants and Light Manipulation : The Integrated Mineral System in Okra Leaves

Calcium oxalate and silica minerals are common components of a variety of plant leaves. These minerals are found at different locations within the leaf, and there is little conclusive evidence about the functions they perform. Here tools are used from the fields of biology, optics, and imaging to investigate the distributions of calcium oxalate, silica minerals, and chloroplasts in okra leaves, in

An objective approach to identifying individual atrial fibrillation triggers : A simulation study

Background and Objective: Growing evidence shows that certain acute exposures, especially alcohol, may trigger episodes of paroxysmal atrial fibrillation (AF). However, there is a lack of methods for assessing the relation between triggers and AF episodes in individual patients. The present paper proposes an approach to identifying AF triggers based on the assumption that the post-trigger AF burde

Structural Basis for the Brilliant Colors of the Sapphirinid Copepods

Males of sapphirinid copepods use regularly alternating layers of hexagonal-shaped guanine crystals and cytoplasm to produce spectacular structural colors. In order to understand the mechanism by which the different colors are produced, we measured the reflectance of live individuals and then characterized the organization of the crystals and the cytoplasm layers in the same individuals using cryo

Response of the tooth-periodontal ligament-bone complex to load : A microCT study of the minipig molar

One strategy evolved by teeth to avoid irreversible damage is to move and deform under the loads incurred during mastication. A key component in this regard is the periodontal ligament (PDL). The role of the bone underlying the PDL is less well defined. We study the interplay between the PDL and the underlying alveolar bone when loaded in the minipig. Using an Instron loading device we confirmed t

Osteoporosis-related fractures in men and women with established and early rheumatoid arthritis : predictors and risk compared with the general population

Objectives: To study the risk of osteoporosis-related fractures in a community-based sample of men and women with rheumatoid arthritis (RA) overall, as well as early (< 1 year of disease duration, follow-up time maximum 10 years) and established (RA diagnosis since ≥ 5 years on July 1, 1997) RA, compared with the general population. To study potential risk factors for fractures in patients with RA

Phase-contrast enhanced synchrotron micro-tomography of human meniscus tissue

OBJECTIVE: To investigate the feasibility of synchrotron radiation-based phase contrast enhanced micro-computed tomography (SR-PhC-μCT) for imaging of human meniscus. Quantitative parameters related to fiber orientation and crimping were evaluated as potential markers of tissue degeneration.DESIGN: Human meniscus specimens from 10 deceased donors were prepared using different preparation schemes:

Association between usage of household cooking fuel and congenital birth defects-18 months multi-centric cohort study in Nepal

Background: - An estimated 240,000 newborns die worldwide within 28 days of birth every year due to congenital birth defect. Exposure to poor indoor environment contributes to poor health outcomes. In this research, we aim to evaluate the association between the usage of different type household cooking fuel and congenital birth defects in Nepal, as well as investigate whether air ventilation usag

Waves in planetary dynamos

This Special Topic focuses on magnetohydrodynamic (MHD) processes in the deep interiors of planets, in which their fluid dynamos are in operation. The dynamo-generated, global, magnetic fields provide a background for our solar-terrestrial environment. Probing the processes within the dynamos is a significant theoretical and computational challenge and any window into interior dynamics greatly inc

Characterization of Eocene flint

Eocene flint 48–56.0 million years old (mya) from the Negev desert (Israel) was characterized using a suite of analytical techniques. High-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) of the inorganic component showed the texture, morphology, size, and distribution of two silica polymorphs: α–quartz and moganite. While euhedral forms were attri

The influence of the Covid-19 pandemic on municipal meeting places arranging group exercise for older persons

PURPOSE: Many municipalities today, together with other stakeholders, offer group exercises for the older population via municipal meeting places, focusing on promoting good health. During the Covid-19 pandemic, these group exercises either continued in a modified form or ceased. The aim of this study was to explore involved stakeholders' experiences of group exercises for older persons arranged v

Influence of climatic conditions on the link between oxidative stress balance and landfill utilisation as a food resource by white storks

Landfills have played a significant role in the recovery of white storks (Ciconia ciconia) populations across various European countries. While there is ample information about the populational-level effects, there is a lack of knowledge regarding the individual effects of using this food resource for feeding nestlings. This study aims to assess the nutritional status and oxidative stress balance

Schooling experiences in children with long-gap esophageal atresia compared with children with esophageal atresia and primary anastomosis : a Swedish study

Background: Children with long-gap esophageal atresia (LGEA) risk living with aerodigestive morbidity and mental health difficulties. No previous study has investigated their experiences of schooling, despite the importance of schools in children’s development, learning and social relationships. We aimed to describe experiences of schooling in children with LGEA in Sweden in comparison with childr

Gap properties of helical edge states in two-dimensional topological insulators with time-dependent magnetic impurities

The quantum mechanical equivalent of the classical Hall effect can lead to interesting results in solid state physics.A similar effect, that has received attention in recent years, occurs when large spin-orbit coupling is present in a material, the so-called quantum-spin Hall effect.In two-dimensional materials it leads to so-called helical edge states that exhibit counter-propagating electron sta