120 research outputs found
Uniform Continuity and Br\'ezis-Lieb Type Splitting for Superposition Operators in Sobolev Space
Using concentration-compactness arguments we prove a variant of the
Brezis-Lieb-Lemma under weaker assumptions on the nonlinearity than known
before. An intermediate result on the uniform continuity of superposition
operators in Sobolev space is of independent interest
Alternating sign multibump solutions of nonlinear elliptic equations in expanding tubular domains
Let denote a smooth simple curve in , ,
possibly with boundary. Let be the open normal tubular
neighborhood of radius 1 of the expanded curve . Consider the superlinear problem
on the domains , as , with homogeneous Dirichlet boundary condition. We prove the existence
of multibump solutions with bumps lined up along with alternating
signs. The function is superlinear at 0 and at , but it is not
assumed to be odd.
If the boundary of the curve is nonempty our results give examples of
contractible domains in which the problem has multiple sign changing solutions
Boundary clustered layers near the higher critical exponents
We consider the supercritical problem {equation*} -\Delta u=|u|
^{p-2}u\text{\in}\Omega,\quad u=0\text{\on}\partial\Omega, {equation*} where
is a bounded smooth domain in and smaller than
the critical exponent for the Sobolev
embedding of in , We show that in some suitable domains there are positive
and sign changing solutions with positive and negative layers which concentrate
along one or several -dimensional submanifolds of as
approaches from below.
Key words:Nonlinear elliptic boundary value problem; critical and
supercritical exponents; existence of positive and sign changing solutions
A concentration phenomenon for semilinear elliptic equations
For a domain \Omega\subset\dR^N we consider the equation -\Delta u +
V(x)u = Q_n(x)\abs{u}^{p-2}u with zero Dirichlet boundary conditions and
. Here and are bounded functions that are positive
in a region contained in and negative outside, and such that the sets
shrink to a point as . We show that if
is a nontrivial solution corresponding to , then the sequence
concentrates at with respect to the and certain
-norms. We also show that if the sets shrink to two points and
are ground state solutions, then they concentrate at one of these points
MusMorph, a database of standardized mouse morphology data for morphometric meta-analyses.
Complex morphological traits are the product of many genes with transient or lasting developmental effects that interact in anatomical context. Mouse models are a key resource for disentangling such effects, because they offer myriad tools for manipulating the genome in a controlled environment. Unfortunately, phenotypic data are often obtained using laboratory-specific protocols, resulting in self-contained datasets that are difficult to relate to one another for larger scale analyses. To enable meta-analyses of morphological variation, particularly in the craniofacial complex and brain, we created MusMorph, a database of standardized mouse morphology data spanning numerous genotypes and developmental stages, including E10.5, E11.5, E14.5, E15.5, E18.5, and adulthood. To standardize data collection, we implemented an atlas-based phenotyping pipeline that combines techniques from image registration, deep learning, and morphometrics. Alongside stage-specific atlases, we provide aligned micro-computed tomography images, dense anatomical landmarks, and segmentations (if available) for each specimen (N = 10,056). Our workflow is open-source to encourage transparency and reproducible data collection. The MusMorph data and scripts are available on FaceBase ( www.facebase.org , https://doi.org/10.25550/3-HXMC ) and GitHub ( https://github.com/jaydevine/MusMorph )
The cross-sectional GRAS sample: A comprehensive phenotypical data collection of schizophrenic patients
<p>Abstract</p> <p>Background</p> <p>Schizophrenia is the collective term for an exclusively clinically diagnosed, heterogeneous group of mental disorders with still obscure biological roots. Based on the assumption that valuable information about relevant genetic and environmental disease mechanisms can be obtained by association studies on patient cohorts of ≥ 1000 patients, if performed on detailed clinical datasets and quantifiable biological readouts, we generated a new schizophrenia data base, the GRAS (Göttingen Research Association for Schizophrenia) data collection. GRAS is the necessary ground to study genetic causes of the schizophrenic phenotype in a 'phenotype-based genetic association study' (PGAS). This approach is different from and complementary to the genome-wide association studies (GWAS) on schizophrenia.</p> <p>Methods</p> <p>For this purpose, 1085 patients were recruited between 2005 and 2010 by an invariable team of traveling investigators in a cross-sectional field study that comprised 23 German psychiatric hospitals. Additionally, chart records and discharge letters of all patients were collected.</p> <p>Results</p> <p>The corresponding dataset extracted and presented in form of an overview here, comprises biographic information, disease history, medication including side effects, and results of comprehensive cross-sectional psychopathological, neuropsychological, and neurological examinations. With >3000 data points per schizophrenic subject, this data base of living patients, who are also accessible for follow-up studies, provides a wide-ranging and standardized phenotype characterization of as yet unprecedented detail.</p> <p>Conclusions</p> <p>The GRAS data base will serve as prerequisite for PGAS, a novel approach to better understanding 'the schizophrenias' through exploring the contribution of genetic variation to the schizophrenic phenotypes.</p
- …