Results 241 to 250 of about 21,221 (284)

Electron microscopy‐based three‐dimensional subcellular imaging of plant male gametophyte

Journal of Integrative Plant Biology, Volume 68, Issue 5, Page 1290-1314, May 2026.
The Aquilos2 Cryo‐FIB workflows provide practical routes for cryo‐electron tomography and volume imaging in plant structural biology. ABSTRACT Understanding cellular events in three dimensions (3D) is of great importance for the annotation and illustration of biological processes in a contextual way. Imaging techniques based on electron microscopy (EM),
Zhiqi Liu, Zizhen Liang, Mengfei Liao, Yixin Huang, Rui Ma, Jiayang Gao, Weiqi Wang, Tao Ni, Philipp S. Erdmann, Liwen Jiang   +9 more
wiley   +1 more source

Optical Mapping of Pacing‐Elicited Slow Waves in the Swine Stomach: Role of Virtual Electrodes

Neurogastroenterology &Motility, Volume 38, Issue 5, May 2026.
Unipolar electrical pacing stimuli delivered to the stomach wall induce adjacent regions of both depolarized and hyperpolarized tissue known as virtual electrodes. Electrical slow waves elicited by pacing start from depolarized virtual electrodes approximately 1 cm from the pacing electrode site and not from the electrode site itself.
Hanyu Zhang, Haley N. Patton, Nipuni D. Nagahawatte, Bijay Guragain, Leo K. Cheng, Gregory P. Walcott, Jack M. Rogers   +6 more
wiley   +1 more source

Serial Spatial Transcriptomes Reveal Regulatory Transitions in Maize Leaf Development

Plant Biotechnology Journal, Volume 24, Issue 5, Page 2787-2810, May 2026.
ABSTRACT Plant leaves originate from the shoot apical meristem (SAM) and undergo a developmental process of highly coordinated gene expression regulation. To date, only a few key regulators have been identified and characterised, so the gene expression cascades responsible for leaf cell specification and differentiation from SAM remain largely elusive.
Chi‐Chih Wu, Ludvig Larsson, Kun‐Ting Hsieh, Chun‐Ping Yu, Yi‐Hua Chen, Kai‐Hsuan Ding, Ho‐Chun Yang, Joakim Lundeberg, Chin‐Min Kimmy Ho, Shu‐Hsing Wu, Mei‐Yeh Jade Lu, Wen‐Hsiung Li   +11 more
wiley   +1 more source

Quantitative Mapping of Nanoscale EGFR–Grb2 Assemblies by DNA‐PAINT

ChemPhysChem, Volume 27, Issue 8, 28 April 2026.
Single‐molecule DNA‐PAINT imaging resolves the nanoscale organization of epidermal growth factor receptor (EGFR) and the adaptor protein Grb2 in cells. An analysis workflow quantitatively reports EGF‐induced EGFR reorganization, increased oligomerization, and progressive Grb2 recruitment at individual membrane‐protein assembly sites.Receptor tyrosine ...
Alexandra Kaminer, Yunqing Li, Hans‐Dieter Barth, Marina S. Dietz, Mike Heilemann   +4 more
wiley   +1 more source

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Designing Highly Reliable Fiducial Markers

IEEE Transactions on Pattern Analysis and Machine Intelligence, 2010
Fiducial markers are artificial landmarks added to a scene to facilitate locating point correspondences between images, or between images and a known model. Reliable fiducials solve the interest point detection and matching problems when adding markers is convenient. The proper design of fiducials and the associated computer vision algorithms to detect
openaire   +4 more sources

Speeded up detection of squared fiducial markers

Image and Vision Computing, 2018
Squared planar markers have become a popular method for pose estimation in applications such as autonomous robots, unmanned vehicles and virtual trainers. The markers allow estimating the position of a monocular camera with minimal cost, high robustness, and speed.
Romero-Ramirez, Francisco J., Muñoz-Salinas, Rafael, Medina-Carnicer, Rafael   +2 more
openaire   +4 more sources

Marker orientation in fiducial registration

SPIE Proceedings, 2003
Fiducial markers are often employed in image-guided surgical procedures to provide positional information based on pre-operative images. In the standard technique, centroids of three or more markers are localized in both image space and physical space. The localized positions are used in a closed-form algorithm to determine the three-dimensional rigid ...
Xiaofeng Liu, Hakan Cevikalp, J. Michael Fitzpatrick   +2 more
openaire   +1 more source

Augmented reality without fiducial markers

2015 20th Symposium on Signal Processing, Images and Computer Vision (STSIVA), 2015
This work presents an implementation of an augmented reality system that does not use fiducial markers for neither estimating the camera pose nor inserting a virtual object but natural marks such as corners of objects that are present in the scene. The system uses a RGB-D dataset for positioning the camera which moves with 6 DOF, for defining a work ...
Andres Diaz, Sebastian Caicedo, Eduardo Caicedo   +2 more
openaire   +1 more source

Quantification of projective distortion for fiducial markers

2013 21st Signal Processing and Communications Applications Conference (SIU), 2013
The aim of this study is to quantify the projective distortion of candidate quadrilaterals found in a square-framed fiducial marker detection algorithm. Based on the quantified value, candidates can be eliminated in such a way that only the quadrilaterals that may be a projective transformation of a square remain.
Benligiray, Burak, Topal, Cihan, Akınlar, Cüneyt, Genç, Yakup   +3 more
openaire   +2 more sources

Fiducial Marker Placement Via Convex Probe EBUS

Journal of Bronchology & Interventional Pulmonology, 2016
The efficacy of low-dose computed tomography screening is likely to increase the number of early-stage lung cancers identified. The aging population, as well as increase in number of patients with multiple comorbidities, suggests that nonsurgical techniques such as stereotactic body radiotherapy will be vital in treating such malignancies. Convex probe
A Christine, Argento, Roy, Decker, Jonathan, Puchalski   +2 more
openaire   +2 more sources