Year-round under-ice research on MOSAiC using a remotely operated vehicle

To provide easy and reliable access to the underside of the sea-ice during the MOSAiC expedition, the Alfred-Wegener-Institute will operate its new remotely operated vehicle during the full duration of the drift directly from an access hole on the ice. The vehicle has proven its capabilities during several Arctic field campaigns and provides a stable sensor platform, as well as inspection and intervention capabilities. It has a maximum range of 300m from the designated access hole(s) and a depth rating of 100m. The ROV operations under sea ice will allow repeat measurements during the entire drift with little impact to the sea ice, the upper ocean, the ecosystem and other objects of interest. In the current setup, the vehicle comprises various video cameras, a still camera, single and multibeam bathymetric sonar, scanning sonar, a CTD, triplet fluorometer as well as sensors for hyperspectral irradiance, radiance, extinction, dissolved oxygen, pH and nitrate. The vehicle position is recorded by acoustic positioning tied into the floe fixed reference frame of all observations on the central observatory floe. Beyond this, the vehicle also provides several additional power outlets and data ports that allow connecting additional systems to the vehicle. Currently, the integration of a current profiler (ADCP), a zooplankton camera, different nets for zooplankton sampling, as well as a water sampling system are under development. All data are recorded, timestamped on site, and will be uploaded to an open data portal, which will be easily accessible for the scientific community. The main task of the vehicle will be repeated mapping of the spatial variability of the various parameters on a weekly basis. In addition, we plan to use it for deployment and retrieval of under-ice sensor packages and perform inspection and manipulation tasks. The ROV operations can easily be conducted by a small on-board sea-ice team due to the reliable and redundant system architecture. Altogether, measurements give a comprehensive picture of the spatio-temporal evolution of the sea-ice and its associated ecosystem. They link upper ocean dynamics with the thermodynamic and dynamic development of the ice cover. In combination with surface measurements, like aerial photography and terrestrial laser scanning, a full 3D characterization of the local ice cover will enable areal upscaling of the obtained results also using remote sensing data. Ideally these high resolution measurements at the MOSAiC central observatory will be extended with regular missions of an autonomous underwater vehicle (AUV), which can travel longer distances in spite of a small logistical footprint, to tie the local observations into the context of the larger spatial scale of the MOSAiC distributed measurement network

Age differences in heroin and prescription opioid abuse among enrolees into opioid treatment programs

<p>Abstract</p> <p>Background</p> <p>In the United States, among those entering opioid treatment programs (OTPs), prescription opioid (PO) abusers tend to be younger than heroin users. Admissions of older persons to OTPs have been increasing, and it is important to understand typical patterns of use among those older enrolees.</p> <p>Methods</p> <p>To disentangle the effect of age on recent heroin and PO abuse 29,114 enrolees into 85 OTPs were surveyed across 34 states from 2005-2009. OTPs where PO use was prevalent were oversampled.</p> <p>Results</p> <p>Mean age was 34; 28% used heroin only. Younger enrolees had increased odds of using POs relative to using heroin only but mixed model analysis showed that much of the total variability in type of use was attributed to variation in age between OTPs rather than within OTPs.</p> <p>Conclusions</p> <p>Organizational and cultural phenomena (e.g., OTP characteristics) must be examined to better understand the context of individual characteristics (e.g., age). If nesting of enrolees within OTPs is ignored, then associations that primarily operate at the OTP level may be misinterpreted as exclusively dependent on individuals.</p

The corporate social performance of developing country multinationals

In this article, we explore the Corporate Social Performance (CSP) of Developing Country Multinationals (DMNCs). We argue that in competing internationally, DMNCs often face both reputation and legitimacy deficits, which they address by improving their CSP. We develop a series of hypotheses to explain the variation in CSP between DMNCs and domestic-only firms from developing countries and also examine variations in CSP between DMNCs depending on the extent of their multinationality and portfolio of host countries. Our findings support all our hypotheses, which suggest that DMNCs display enhanced levels of CSP compared to their domestic-only counterparts. CSP is also found to be positively related to the DMNCs’ degree of multinationality, but with a declining incremental impact, whereas entry into developed markets leads to a greater improvement in DMNCs’ CSP than expansion into developing markets. We highlight the implications of our findings for managers and researchers

Overview of the MOSAiC expedition: Physical oceanography

Arctic Ocean properties and processes are highly relevant to the regional and global coupled climate system, yet still scarcely observed, especially in winter. Team OCEAN conducted a full year of physical oceanography observations as part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), a drift with the Arctic sea ice from October 2019 to September 2020. An international team designed and implemented the program to characterize the Arctic Ocean system in unprecedented detail, from the seafloor to the air-sea ice-ocean interface, from sub-mesoscales to pan-Arctic. The oceanographic measurements were coordinated with the other teams to explore the ocean physics and linkages to the climate and ecosystem. This paper introduces the major components of the physical oceanography program and complements the other team overviews of the MOSAiC observational program. Team OCEAN’s sampling strategy was designed around hydrographic ship-, ice- and autonomous platform-based measurements to improve the understanding of regional circulation and mixing processes. Measurements were carried out both routinely, with a regular schedule, and in response to storms or opening leads. Here we present along-drift time series of hydrographic properties, allowing insights into the seasonal and regional evolution of the water column from winter in the Laptev Sea to early summer in Fram Strait: freshening of the surface, deepening of the mixed layer, increase in temperature and salinity of the Atlantic Water. We also highlight the presence of Canada Basin deep water intrusions and a surface meltwater layer in leads. MOSAiC most likely was the most comprehensive program ever conducted over the ice-covered Arctic Ocean. While data analysis and interpretation are ongoing, the acquired datasets will support a wide range of physical oceanography and multi-disciplinary research. They will provide a significant foundation for assessing and advancing modeling capabilities in the Arctic Ocean

Current concepts on oxidative/carbonyl stress, inflammation and epigenetics in pathogenesis of chronic obstructive pulmonary disease

Chronic obstructive pulmonary disease (COPD) is a global health problem, and current therapy for COPD is poorly effective and the mainstays of pharmacotherapy are bronchodilators. A better understanding of the pathobiology of COPD is critical for the development of novel therapies. In the present review, we have discussed the roles of oxidative/aldehyde stress, inflammation/immunity, and chromatin remodeling in the pathogenesis of COPD. Imbalance of oxidant/antioxidant balance caused by cigarette smoke and other pollutants/biomass fuels plays an important role in the pathogenesis of COPD by regulating redox-sensitive transcription factors (e.g. NF-κB), autophagy and unfolded protein response leading to chronic lung inflammatory response. Cigarette smoke also activates canonical/alternative NF-κB pathways and their upstream kinases leading to sustained inflammatory response in lungs. Recently, epigenetic regulation has been shown to be critical for the development of COPD because the expression/activity of enzymes that regulate these epigenetic modifications have been reported to be abnormal in airways of COPD patients. Hence, the significant advances made in understanding the pathophysiology of COPD as described herein will identify novel therapeutic targets for intervening COPD

MOSAiC Extended Acknowledgement

For years, the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), together with the international MOSAiC partners, had been planning and developing the scientific, logistical and financial concept for the implementation of the MOSAiC expedition. The planning and organization of this endeavor was an enormous e˙ort, involving more than 80 institutions from 20 countries. The number of groups and individuals that significantly contributed to the success of the drift observatory goes far beyond the scope of usual polar expeditions