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Hotspots of subterranean biodiversity
No full textDiversity, Volume 12, Issue 5, 1 May 2020, Article number 209.Worldwide, caves and groundwater habitats harbor thousands of species modified and limited to subterranean habitats in karst. Data are concentrated in Europe and USA, where a number of detailed analyses have been performed. Much less is known with respect to global patterns due to a lack of data. This special issue will focus on and discuss the global patterns of individual hotspot caves and groundwater habitats
When paywall goes AWOL: the demand for open-access education research
No full textEducational Researcher, Volume 49, Issue 4, 1 May 2020, Pages 254-261.As universities cut library funding and forego expensive journal subscriptions, many academic organizations and researchers, including the American Educational Research Association (AERA), are moving toward open-access publications that are freely downloadable by anyone with a working internet connection. However, the impact of paywalls on the consumption of academic articles is unclear. We provide novel evidence on this question by exploiting a natural experiment in which six high-impact, usually gated AERA journals became open access for a 2-month period in 2017. Using monthly download data and an always-open-access journal as a comparison group, we show that making journals open access likely increased article downloads in those journals by 55% to 95% per month. Given a per-article download price of $36, this suggests a relatively elastic response: The average price elasticity of demand for downloads is 1.2, with individual journal elasticities ranging from 0.6 to 2
Heiner Muller: Waiting on the opposite stage: Collected poems
No full textThis translation of Heiner Muller poems was withdrawn from publication and the copyright reverted to the translator, James Reidel
Person walking by a boarded-up storefront
No full textA person in an orange hat walks in the street in front of a white vehicle that is partially in the frame, and past the front of the West Elm store. The store windows below the sign are barded with wood
Signs on the door of Po Boy Jim Bar and Grill
No full textSigns posted on the door of Po Boy Jim Bar and Grill on COVID-19 safety precautions and limits on number of people allowed in the restaurant at a time
View of Bar Elena on H Street NE
No full textView of Bar Elena with thank you signs posted on the door and window
Woman wearing a mask and carrying plants walks south on the Taft Bridge
No full textWoman wearing a mask and carrying plants walks south on the Taft Bridge. Connecticut Avenue NW is free of traffic and very few people are visible in the background
Sign with an image of Donald Trump
No full textSign with an image of Donald Trump that reads, 'I want YOU to die for our economy, open America today!' The cement wall also has remnants of old signs, posters, paint, and spray-paint. Beneath the signs is the spray-painted URL, 'strikedc.org.
Closed sign on the door of Washington Community Fellowship Church
No full textClosed sign on the door of Washington Community Fellowship Church at Maryland Avenue and 9th Street NE
Carbon nanotube yarn microelectrodes promote high temporal measurements of serotonin using fast scan cyclic voltammetry
No full textSensors (Switzerland), Volume 20, Issue 4, 2 February 2020, Article number 1173.Carbon fiber‐microelectrodes (CFMEs) have been the standard for neurotransmitter detection for over forty years. However, in recent years, there have been many advances of utilizing alternative nanomaterials for neurotransmitter detection with fast scan cyclic voltammetry (FSCV). Recently, carbon nanotube (CNT) yarns have been developed as the working electrode materials for neurotransmitter sensing capabilities with fast scan cyclic voltammetry. Carbon nanotubes are ideal for neurotransmitter detection because they have higher aspect ratios enabling monoamine adsorption and lower limits of detection, faster electron transfer kinetics, and a resistance to surface fouling. Several methods to modify CFMEs with CNTs have resulted in increases in sensitivity, but have also increased noise and led to irreproducible results. In this study, we utilize commercially available CNT‐yarns to make microelectrodes as enhanced neurotransmitter sensors for neurotransmitters such as serotonin. CNT‐yarn microelectrodes have significantly higher sensitivities (peak oxidative currents of the cyclic voltammograms) than CFMEs and faster electron transfer kinetics as measured by peak separation (ΔEP) values. Moreover, both serotonin and dopamine are adsorption controlled to the surface of the electrode as measured by scan rate and concentration experiments. CNT yarn microelectrodes also resisted surface fouling of serotonin onto the surface of the electrode over thirty minutes and had a wave application frequency independent response to sensitivity at the surface of the electrode