890 research outputs found
Image data processing system requirements study. Volume 2: Appendixes
Supporting information for the ERS loading study contains computer simulation loading output including printout description, and similar output representing data that include night station contacts
Image data processing system requirements study. Volume 1: Analysis
Digital image processing, image recorders, high-density digital data recorders, and data system element processing for use in an Earth Resources Survey image data processing system are studied. Loading to various ERS systems is also estimated by simulation
EOS image data processing system definition study
The Image Processing System (IPS) requirements and configuration are defined for NASA-sponsored advanced technology Earth Observatory System (EOS). The scope included investigation and definition of IPS operational, functional, and product requirements considering overall system constraints and interfaces (sensor, etc.) The scope also included investigation of the technical feasibility and definition of a point design reflecting system requirements. The design phase required a survey of present and projected technology related to general and special-purpose processors, high-density digital tape recorders, and image recorders
Volterra-Prabhakar derivative of distributed order and some applications
The paper studies the exact solution of two kinds of generalized
Fokker-Planck equations in which the integral kernels are given either by the
distributed order function or the distributed order Prabhakar function ,
where the Prabhakar function is denoted as . Both of these integral kernels can be called the fading
memory functions and are the Stieltjes functions. It is also shown that their
Stieltjes character is enough to ensure the non-negativity of the mean square
values and higher even moments. The odd moments vanish. Thus, the solution of
generalized Fokker-Planck equations can be called the probability density
functions. We introduce also the Volterra-Prabhakar function and its
generalization which are involved in the definition of and generated by it the probability density function
An attempt at assessing the efficacy of combined positron emision tomography and computed tomography (PET/CT) imaging in the diagnosis of pancreatic carcinoma - own experiences
Quest for hyperheavy toroidal nuclei
We investigate the possibility of observing toroidal breakup configurations in Au+Au collisions using the CHIMERA multidetector system. BUU simulations indicate that the threshold energy for toroidal configuration
formation is around 23 MeV/nucleon. The simulations of the Decay process using the static model code ETNA indicate the sensitivity of some observables to different studied break-up geometries
Epigenetic silencing of nucleolar rRNA genes in Alzheimer\u27s disease
BACKGROUND: Ribosomal deficits are documented in mild cognitive impairment (MCI), which often represents an early stage Alzheimer\u27s disease (AD), as well as in advanced AD. The nucleolar rRNA genes (rDNA), transcription of which is critical for ribosomal biogenesis, are regulated by epigenetic silencing including promoter CpG methylation.
METHODOLOGY/PRINCIPAL FINDINGS: To assess whether CpG methylation of the rDNA promoter was dysregulated across the AD spectrum, we analyzed brain samples from 10 MCI-, 23 AD-, and, 24 age-matched control individuals using bisulfite mapping. The rDNA promoter became hypermethylated in cerebro-cortical samples from MCI and AD groups. In parietal cortex, the rDNA promoter was hypermethylated more in MCI than in advanced AD. The cytosine methylation of total genomic DNA was similar in AD, MCI, and control samples. Consistent with a notion that hypermethylation-mediated silencing of the nucleolar chromatin stabilizes rDNA loci, preventing their senescence-associated loss, genomic rDNA content was elevated in cerebrocortical samples from MCI and AD groups.
CONCLUSIONS/SIGNIFICANCE: In conclusion, rDNA hypermethylation could be a new epigenetic marker of AD. Moreover, silencing of nucleolar chromatin may occur during early stages of AD pathology and play a role in AD-related ribosomal deficits and, ultimately, dementia
Wstępna ocena badania PET/CT u chorych z rakiem pęcherzyka żółciowego rozpoznanym przypadkowo podczas lub po cholecystektomii
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