Search results for "biological model"

Sporadic nesting reveals long distance colonisation in the philopatric loggerhead sea turtle (Caretta caretta)

2018

The colonisation of new suitable habitats is crucial for species survival at evolutionary scale under changing environmental conditions. However, colonisation potential may be limited by philopatry that facilitates exploiting successful habitats across generations. We examine the mechanisms of long distance dispersal of the philopatric loggerhead sea turtle (Caretta caretta) by analysing 40 sporadic nesting events in the western Mediterranean. The analysis of a fragment of the mitochondrial DNA and 7 microsatellites of 121 samples from 18 of these nesting events revealed that these nests were colonising events associated with juveniles from distant populations feeding in nearby foraging gro…

Left hemisphere enhancement of auditory activation in language impaired children

2019

| openaire: EC/H2020/641652/EU//ChildBrain Specific language impairment (SLI) is a developmental disorder linked to deficient auditory processing. In this magnetoencephalography (MEG) study we investigated a specific prolonged auditory response (N250m) that has been reported predominantly in children and is associated with level of language skills. We recorded auditory responses evoked by sine-wave tones presented alternately to the right and left ear of 9–10-year-old children with SLI (n = 10) and children with typical language development (n = 10). Source analysis was used to isolate the N250m response in the left and right hemisphere. In children with language impairment left-hemisphere …

Human blastocysts derived from monopronuclear zygotes: a biological model for the study of ploidy, euploidy, topography and heteroparental inheritance

2019

Mikroangiographische Untersuchungen verschiedener menschlicher Tumoren nach Transplantation auf thymusaplastische Nacktmäuse

1983

Zehn verschiedene humane Tumoren (zwei Weichteilsarkome, sieben Adenokarzinome des Dickdarms und Magens sowie ein Plattenepithelkarzinom der Lunge) wurden unter die Bauchhaut von thymusaplastischen Nacktmausen implantiert und nach Anwachsen uber mehrere Generationen transplantiert. Bei 40 Tieren wurden die resultierenden Tumoren mikroangiographisch und histologisch untersucht und unter Zugrundelegung der bekannten angiographischen Tumorkriterien klassifiziert. Hierbei fanden sich bei Transplantaten des selben Ursprungstumors immer gleichartige Gefasbilder. Die histologischen Bilder korrelierten gut mit den rontgenologischen Befunden. Die histologische Feinstruktur der Tumorgefase sowie die …

Dissensus, death and division

2009

The modeling of switching systems describing networks where death and duplication processes occur is described. A dissensus protocol, complementary to consensus protocol, is introduced and the convergence or divergence of the agents' state evolution is studied. We discuss some properties of the topology reached by the network when different rules of duplication and inheritance are implemented.

External photon radiation treatment for prostate cancer: Uncomplicated and cancer-free control probability assessment of 36 plans

2019

[Purpose] To perform a systematic and thorough assessment, using the Uncomplicated and Cancer-Free Control Probability (UCFCP) function, of a broad range of photon prostate cancer RT treatments, on the same scenario (a unique pelvic CT set). UCFCP considers, together with the probabilities of local tumour control (TCP) and deterministic (late) sequelae (NTCP), the second primary cancer risk (SPCR) due to photon and neutron peripheral doses.

Bis-cyclohexyl-crown-ethers as allosteric carriers

1992

Abstract Several bis-cyclohexyl-crown-ethers have been synthesized and used as carriers for alkaline cations. These compounds should all show negative allosteric cooperativity, but only 1 exhibits an odd cation transport behavior across the liquid organic membranes.

Novel 3D bio-macromolecular bilinear descriptors for protein science: Predicting protein structural classes

2015

In the present study, we introduce novel 3D protein descriptors based on the bilinear algebraic form in the ℝn space on the coulombic matrix. For the calculation of these descriptors, macromolecular vectors belonging to ℝn space, whose components represent certain amino acid side-chain properties, were used as weighting schemes. Generalization approaches for the calculation of inter-amino acidic residue spatial distances based on Minkowski metrics are proposed. The simple- and double-stochastic schemes were defined as approaches to normalize the coulombic matrix. The local-fragment indices for both amino acid-types and amino acid-groups are presented in order to permit characterizing fragme…

Isolated myocardiocytes and DNA synthesis: a possible experimental model to predict the in vivo cardiotoxicity

1989

Reaction-Diffusion Network For Geometric Multiscale High Speed Image Processing

2010

International audience; In the framework of heavy mid-level processing for high speed imaging, a nonlinear bi-dimensional network is proposed, allowing the implementation of active curve algorithms. Usually this efficient type of algorithm is prohibitive for real-time image processing due to its calculus charge and the inadequate structure for the use of serial or parallel architectures. Another kind of implementation philosophy is proposed here, by considering the active curve generated by a propagation phenomenon inspired from biological modeling. A programmable nonlinear reaction-diffusion system is proposed under front control and technological constraints. Geometric multiscale processin…