scholarly journals Growth oscillation in larger foraminifera

Paleobiology ◽  
10.1666/13051 ◽  
2014 ◽  
Vol 40 (3) ◽  
pp. 494-509 ◽  
Author(s):  
Antonino Briguglio ◽  
Johann Hohenegger

This work shows the potential for applying three-dimensional biometry to studying cell growth in larger benthic foraminifera. The volume of each test chamber was measured from the three-dimensional model obtained by means of computed tomography. Analyses of cell growth based on the sequence of chamber volumes revealed constant and significant oscillations for all investigated specimens, characterized by periods of approximately 15, 30, 90, and 360 days. Possible explanations for these periods are connected to tides, lunar cycles, and seasonality. The potential to record environmental oscillations or fluctuations during the lifetime of larger foraminifera is pivotal for reconstructing short-term paleoenvironmental variations or for gaining insight into the influence of tides or tidal current on the shallow-water benthic fauna in both recent and fossil environments.

2021 ◽  
Vol 8 ◽  
Author(s):  
Rodrigo V. Honorato ◽  
Panagiotis I. Koukos ◽  
Brian Jiménez-García ◽  
Andrei Tsaregorodtsev ◽  
Marco Verlato ◽  
...  

Structural biology aims at characterizing the structural and dynamic properties of biological macromolecules at atomic details. Gaining insight into three dimensional structures of biomolecules and their interactions is critical for understanding the vast majority of cellular processes, with direct applications in health and food sciences. Since 2010, the WeNMR project (www.wenmr.eu) has implemented numerous web-based services to facilitate the use of advanced computational tools by researchers in the field, using the high throughput computing infrastructure provided by EGI. These services have been further developed in subsequent initiatives under H2020 projects and are now operating as Thematic Services in the European Open Science Cloud portal (www.eosc-portal.eu), sending >12 millions of jobs and using around 4,000 CPU-years per year. Here we review 10 years of successful e-infrastructure solutions serving a large worldwide community of over 23,000 users to date, providing them with user-friendly, web-based solutions that run complex workflows in structural biology. The current set of active WeNMR portals are described, together with the complex backend machinery that allows distributed computing resources to be harvested efficiently.


2012 ◽  
Vol 45 (4) ◽  
pp. 203-214 ◽  
Author(s):  
Martin Desseilles ◽  
Trina Chang ◽  
Camille Piguet ◽  
Gilles Bertschy ◽  
Alexandre G. Dayer

Author(s):  
Adaobi Vivian Duru ◽  
Emeka Lucky Umejei ◽  
Ikechukwu W. Eke

This chapter examines the performative turn in Nigeria's political landscape through an analysis of YouTube videos involving three leading politicians in the country. It argues that Nigerian political actors use dance and music as strategies to wield power. The videos analyzed are the “Conqueror Dance” of Olusegun Obasanjo, a former Nigerian president; the “Elephant Dance” by Bola Ahmed Tinubu, national leader of the ruling All Progressives Congress (APC); and Senator Dino Melaye's “Ajekun Iya Ni Oje.” The authors employed the critical discourse analysis as the conceptual framework and drew on Norman Fairclough's three-dimensional model as the analytical framework to examine the messages inherent in the songs, thus providing insight into the way Nigerian politicians use musical performances to propagate political inequality and abuse of power. The findings suggest that political actors in Nigeria employ tropes as performative devices to entrench mockery, intimidation, threat, vainglory, name-calling, political war and conquest, and imperialism.


Author(s):  
Nedas Jurgaitis

Climate change is a phenomenon that is increasingly moving into the focus of public discourse. The object of the present study is the linguistic expression of the concept of CLIMATE CHANGE in German and Lithuanian public discourse, especially metaphorical expressions such as a monster called climate change or lexicalized metaphors like the fight against climate change. The aim of the study is to compare conceptual metaphors in the Lithuanian and German public discourse. The main research method is the analysis of conceptual metaphors based on the three-dimensional model of metaphor. The method is in line with the cognitive concept of the research, in which a metaphor is understood not as a linguistic phenomenon, but as a thinking strategy, mapping from a source domain to a target domain. The research is also based on ethnolinguistic principles since conceptual metaphors are linked not only to the cultural experience of an individual but of the entire nation. The analysis of the conceptual metaphors provides an insight into the perception of climate change in both languages. The concept of CLIMATE CHANGE is structured by several source domains, which can be classified according to the scala naturae (Great Chain of Being): NATURE, PLANTS, ANIMALS, HUMANITY, SUPERNATURE. The areas include different metaphorical images. Metaphorical expressions reveal that the target concept is reflected by universal conceptual metaphors in both languages, but their linguistic expression in German and Lithuanian is partly unique. The concept of CLIMATE CHANGE also has a communicative role achieved by deliberate metaphors in both languages.


Author(s):  
Peter Sterling

The synaptic connections in cat retina that link photoreceptors to ganglion cells have been analyzed quantitatively. Our approach has been to prepare serial, ultrathin sections and photograph en montage at low magnification (˜2000X) in the electron microscope. Six series, 100-300 sections long, have been prepared over the last decade. They derive from different cats but always from the same region of retina, about one degree from the center of the visual axis. The material has been analyzed by reconstructing adjacent neurons in each array and then identifying systematically the synaptic connections between arrays. Most reconstructions were done manually by tracing the outlines of processes in successive sections onto acetate sheets aligned on a cartoonist's jig. The tracings were then digitized, stacked by computer, and printed with the hidden lines removed. The results have provided rather than the usual one-dimensional account of pathways, a three-dimensional account of circuits. From this has emerged insight into the functional architecture.


Skull Base ◽  
2008 ◽  
Vol 18 (S 01) ◽  
Author(s):  
Akio Morita ◽  
Toshikazu Kimura ◽  
Shigeo Sora ◽  
Kengo Nishimura ◽  
Hisayuki Sugiyama ◽  
...  

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