scholarly journals Vertical niche definition of test‐bearing protists (Rhizaria) into the twilight zone revealed by in situ imaging

2020 ◽  
Vol 65 (11) ◽  
pp. 2583-2602 ◽  
Author(s):  
Tristan Biard ◽  
Mark D. Ohman
Keyword(s):  
Twilight Zone ◽  
Definition Of ◽  
In Situ Imaging

scholarly journals Vertical niche definition of test-bearing protists (Rhizaria) into the twilight zone revealed by in situ imaging

2019 ◽  
Author(s):  
Tristan Biard ◽  
Mark D. Ohman
Keyword(s):  
Generalized Additive Models ◽  
Biotic Interactions ◽  
Euphotic Zone ◽  
Important Variable ◽  
Additive Models ◽  
Ecological Niches ◽  
Twilight Zone ◽  
Biogeochemical Models ◽  
In Situ Imaging

AbstractThe Rhizaria is a super-group of ameoboid protists with ubiquitous distributions, from the euphotic zone to the twilight zone and beyond. While rhizarians have been recently described as important contributors to both silica and carbon fluxes, we lack the most basic information about their ecological preferences. Here, using the in situ imaging (Underwater Vision Profiler 5), we characterize the vertical ecological niches of different test-bearing rhizarian taxa in the southernCalifornia Current Ecosystem. We define three vertical layers between 0-500 m occupied, respectively, by 1) surface dwelling and mostly symbiont-bearing rhizarians (Acantharia and Collodaria), 2) flux-feeding phaeodarians in the lower epipelagic (100-200 m), and 3) Foraminifera and Phaeodaria populations adjacent to the Oxygen Minimum Zone. We then use Generalized Additive Models to analyze the response of each rhizarian category to a suite of environmental variables. The models explain between 13 and 93% of the total variance observed for the different groups. While temperature and the depth of the deep chlorophyll maximum, appear as the main factors influencing populations in the upper 200 m, silicic acid concentration is the most important variable related to the abundance of mesopelagic phaeodarians. The relative importance of biotic interactions (e.g., predation, parasitism) is still to be considered, in order to fully incorporate the dynamics of test-bearing pelagic rhizarians in ecological and biogeochemical models.

Development of in situ Imaging Probe for Surgical Operation of Deep Brain Stimulation

2011 ◽  
Vol 131 (12) ◽  
pp. 427-428
Author(s):  
Toshihiko Noda ◽  
Pan Yi-Li ◽  
Ayato Tagawa ◽  
Takuma Kobayashi ◽  
Kiyotaka Sasagawa ◽  
...  
Keyword(s):  
Deep Brain Stimulation ◽  
Brain Stimulation ◽  
Surgical Operation ◽  
Imaging Probe ◽  
Deep Brain ◽  
In Situ Imaging

scholarly journals Experimental Evaluation of Shear Behavior of Stone Masonry Wall

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2313
Author(s):  
Maria Luisa Beconcini ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
Benedetta Puccini
Keyword(s):  
Shear Behavior ◽  
Stone Masonry ◽  
Masonry Walls ◽  
Mechanical Parameters ◽  
In Situ Tests ◽  
Capacity Curves ◽  
Historical Structures ◽  
Definition Of

The evaluation of the shear behavior of masonry walls is a first fundamental step for the assessment of existing masonry structures in seismic zones. However, due to the complexity of modelling experimental behavior and the wide variety of masonry types characterizing historical structures, the definition of masonry’s mechanical behavior is still a critical issue. Since the possibility to perform in situ tests is very limited and often conflicting with the needs of preservation, the characterization of shear masonry behavior is generally based on reference values of mechanical properties provided in modern structural codes for recurrent masonry categories. In the paper, a combined test procedure for the experimental characterization of masonry mechanical parameters and the assessment of the shear behavior of masonry walls is presented together with the experimental results obtained on three stone masonry walls. The procedure consists of a combination of three different in situ tests to be performed on the investigated wall. First, a single flat jack test is executed to derive the normal compressive stress acting on the wall. Then a double flat jack test is carried out to estimate the elastic modulus. Finally, the proposed shear test is performed to derive the capacity curve and to estimate the shear modulus and the shear strength. The first results obtained in the experimental campaign carried out by the authors confirm the capability of the proposed methodology to assess the masonry mechanical parameters, reducing the uncertainty affecting the definition of capacity curves of walls and consequently the evaluation of seismic vulnerability of the investigated buildings.

Single cell capture, isolation, and long‐term in‐situ imaging using quantitative self‐interference spectroscopy

2021 ◽  
Author(s):  
Rongxin Fu ◽  
Ya Su ◽  
Ruliang Wang ◽  
Xue Lin ◽  
Xiangyu Jin ◽  
...  
Keyword(s):  
Single Cell ◽  
Cell Capture ◽  
In Situ Imaging

Persistent luminescent nanoparticles for super-long time in vivo and in situ imaging with repeatable excitation

2014 ◽  
Vol 145 ◽  
pp. 838-842 ◽  
Author(s):  
Meng Sun ◽  
Zhan-Jun Li ◽  
Chun-Lin Liu ◽  
Hai-Xia Fu ◽  
Jiang-Shan Shen ◽  
...  
Keyword(s):  
Long Time ◽  
Luminescent Nanoparticles ◽  
In Situ Imaging

Uniform-intensity, visible light source for in situ imaging

2009 ◽  
Vol 14 (2) ◽  
pp. 024024 ◽  
Author(s):  
Eyal Bar-Kochba ◽  
Saagar Govil ◽  
Jon P. Longtin ◽  
Andrew Gouldstone ◽  
Mary D. Frame
Keyword(s):  
Visible Light ◽  
Light Source ◽  
In Situ Imaging

scholarly journals In-Situ Imaging and Quantification of Tritium Surface Contamination via Coherent Fiber Bundle

2002 ◽  
Vol 41 (3P2) ◽  
pp. 551-554 ◽  
Author(s):  
Charles A. Gentile ◽  
John J. Parker ◽  
Stewart J. Zweben
Keyword(s):  
Fiber Bundle ◽  
Surface Contamination ◽  
In Situ Imaging
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