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Structurally complex habitats tend to contain more species and higher total abundances than simple habitats. This ecological paradigm is grounded in first principles: species richness scales with area, and surface area and niche density increase with three-dimensional complexity. Here we present a geometric basis for surface habitats that unifies ecosystems and spatial scales. The theory is framed by fundamental geometric constraints between three structure descriptors-surface height, rugosity and fractal dimension-and explains 98% of surface variation in a structurally complex test system: coral reefs. Then, we show how coral biodiversity metrics (species richness, total abundance and probability of interspecific encounter) vary over the theoretical structure descriptor plane, demonstrating the value of the theory for predicting the consequences of natural and human modifications of surface structure.
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http://dx.doi.org/10.1038/s41559-020-1281-8 | DOI Listing |
Radiother Oncol
September 2025
Dept of Radiation Oncology, Centre Léon Bérard, Lyon, France. Electronic address:
Background And Purpose: To date, no consensus guidelines have been published that systematically guide delineation of primary and nodal Clinical Target Volumes (CTVs) in patients who require post-operative radiotherapy (PORT) for mucosal Head and Neck squamous cell carcinoma (HNSCC). As a result, significant individual, institutional and national variation exists in the way that CTVs are delineated in the post-operative setting, leading to considerable heterogeneity in radiotherapy treatment.
Methods: A multi-disciplinary group of experts convened by the European Society for Radiotherapy and Oncology (ESTRO) set-out principles for the multi-disciplinary management of oral cavity squamous cell carcinoma (OCSCC).
Comput Biol Med
September 2025
Laboratorio de Procesado de Imagen (LPI), ETSI Telecomunicación, Universidad de Valladolid, Valladolid, Spain. Electronic address:
Modelling the diffusion-relaxation magnetic resonance (MR) signal obtained from multi-parametric sequences has recently gained immense interest in the community due to new techniques significantly reducing data acquisition time. A preferred approach for examining the diffusion-relaxation MR data is to follow the continuum modelling principle that employs kernels to represent the tissue features, such as the relaxations or diffusion properties. However, constructing reasonable dictionaries with predefined signal components depends on the sampling density of model parameter space, thus leading to a geometrical increase in the number of atoms per extra tissue parameter considered in the model.
View Article and Find Full Text PDFJ Mol Model
September 2025
College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, China.
Context: High-nitrogen polycyclic compounds have become a research hotspot in the design of new energetic molecules due to their dense nitrogen content, high positive enthalpy of formation, and good structural stability. In particular, the fused structures of triazole and triazine heterocycles can not only enhance energy output but also possess excellent thermal stability. This study focuses on three triazolotriazine energetic compounds: 3,7-dinitro-[1,2,4]triazolo[5,1-c][1,2,4]triazin-4-amine (TTX), 7-nitro-3-(1H-tetrazol-5-yl)-[1,2,4]triazolo[5,1-c][1,2,4]triazin-4-amine (compound 1), and 3,3'-dinitro-[7,7'-bi[1,2,4]triazolo[5,1-c][1,2,4]triazine]-4,4'-diamine (compound 2).
View Article and Find Full Text PDFJ Chem Theory Comput
September 2025
LSP Consulting LLC, Temecula, California 92591, United States.
Conformational entropy associated with thermal vibrations plays fundamental roles in protein function, from ligand binding and catalysis to allosteric regulation. Cooper and Dryden first proposed entropy-driven allostery as an example of these effects. However, measuring the underlying thermal motions remains technically challenging.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
September 2025
Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
Biological ion channels can regulate finely the ion transmembrane permeation, with superhigh ion selectivity and on-off ion flux in response to external stimuli, for signal transduction and energy conversion. However, fabricating smart artificial nanochannels with analogous functions remain challenging by single design of structure or charge property. In vivo, function basis of pH-gated TWIK-related acid-sensitive K channel 2 (TASK2) channels is attributed to synergy control of geometrical conformation and surface potential for filter gates.
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