The physiological ecology of a marine diatom, Skeletonema costatum (Grev.) Cleve

The marine plankton diatom, Skeletonema costatum, was isolated from local waters and cultured in enriched sea water. The effects of light, temperature, salinity, and concentrations of phosphorus and nitrogen on its growth and photosynthesis were determined separately and simultaneously. The effects of exocrine production by Skeletonema and grazing by copepods also wer e tested . The experimental results were used in developing an index of the photosynthetic potential of the diatom for seasonal hydrographic conditions found in the continental shelf waters south of Long Island...

Herbert G. Jones Correspondence

Entries include a brief biography, typed and handwritten correspondence on personal radio station, literary, artistic, and press stationery with apologies and a sketc

Ethel Godfrey Loud Correspondence

Entries include handwritten biographical letters on personal stationery

The work of Global Digital Heritage for the massive digitization of fortifications in Spain

[EN] In the last 20 years the field of cultural heritage has experienced a revolution in terms of documentation methods. The latest technological advances in laser scanners and photogrammetry have opened the possibility of documenting in three dimensions all types of monuments and sites regardless of their size or complexity. In this revolution fortified spaces have not been an exception. Hundreds of research teams around the world have developed 3D digitization projects of castles and fortresses. However, the overall impact of these projects has been very limited, partly due to the lack of collaboration and partly due to the inability of citizens to freely access the data. Currently, the research team of the US non-profit entity Global Digital Heritage is working on the massive digitization of fortifications in Spain, regardless of their chronology or size. In this context, work has been done on digitizing the prehistoric fortified site of Motilla del Azuer in Daimiel, the Iberian oppidum of Cerro de las Cabezas in Valdepeñas, the fortified Islamic city of Calatrava La Vieja in Carrión de Calatrava, the medieval Christian castle of Calatrava La Nueva in Aldea del Rey, the medieval-Renaissance castle of Los Vélez in Mula, the watchtower of Cope in Águilas or the machine-gun bunker of the Spanish Civil War in Alhama de Murcia, to name just a few examples.López-Menchero Bendicho, VM.; Maschner, HDG.; Mcleod, JB.; Du Vernay, JP.; Hervás Herrera, MÀ. (2020). The work of Global Digital Heritage for the massive digitization of fortifications in Spain. Editorial Universitat Politècnica de València. 333-340. https://doi.org/10.4995/FORTMED2020.2020.11415OCS33334

Chapter At the Intersection of Art, Architecture and Archaeology: 3D Virtualization and Contemporary Heritage

We are at a global transition where disciplines from art to computer engineering intersect in the realm of global digital heritage. This has been facilitated by the development of desktop high-speed computing, inexpensive photogrammetry software, and digital photography. These technologies, and the tools to make them useful both in the lab and on the web, require the appropriate integration of technical skill, artistic license, archaeological background knowledge, and architectural realities

Writing in Britain and Ireland, c. 400 to c. 800

No abstract available

Ectonucleotidases in Müller glial cells of the rodent retina: Involvement in inhibition of osmotic cell swelling

Extracellular nucleotides mediate glia-to-neuron signalling in the retina and are implicated in the volume regulation of retinal glial (Müller) cells under osmotic stress conditions. We investigated the expression and functional role of ectonucleotidases in Müller cells of the rodent retina by cell-swelling experiments, calcium imaging, and immuno- and enzyme histochemistry. The swelling of Müller cells under hypoosmotic stress was inhibited by activation of an autocrine purinergic signalling cascade. This cascade is initiated by exogenous glutamate and involves the consecutive activation of P2Y1 and adenosine A1 receptors, the action of ectoadenosine 5′-triphosphate (ATP)ases, and a nucleoside-transporter-mediated release of adenosine. Inhibition of ectoapyrases increased the ATP-evoked calcium responses in Müller cell endfeet. Müller cells were immunoreactive for nucleoside triphosphate diphosphohydrolases (NTPDase)2 (but not NTPDase1), ecto-5′-nucleotidase, P2Y1, and A1 receptors. Enzyme histochemistry revealed that ATP but not adenosine 5′-diphosphate (ADP) is extracellularly metabolised in retinal slices of NTPDase1 knockout mice. NTPDase1 activity and protein is restricted to blood vessels, whereas activity of alkaline phosphatase is essentially absent at physiological pH. The data suggest that NTPDase2 is the major ATP-degrading ectonucleotidase of the retinal parenchyma. NTPDase2 expressed by Müller cells can be implicated in the regulation of purinergic calcium responses and cellular volume