Highly-parallelized simulation of a pixelated LArTPC on a GPU

The rapid development of general-purpose computing on graphics processing units (GPGPU) is allowing the implementation of highly-parallelized Monte Carlo simulation chains for particle physics experiments. This technique is particularly suitable for the simulation of a pixelated charge readout for time projection chambers, given the large number of channels that this technology employs. Here we present the first implementation of a full microphysical simulator of a liquid argon time projection chamber (LArTPC) equipped with light readout and pixelated charge readout, developed for the DUNE Near Detector. The software is implemented with an end-to-end set of GPU-optimized algorithms. The algorithms have been written in Python and translated into CUDA kernels using Numba, a just-in-time compiler for a subset of Python and NumPy instructions. The GPU implementation achieves a speed up of four orders of magnitude compared with the equivalent CPU version. The simulation of the current induced on 10^3 pixels takes around 1 ms on the GPU, compared with approximately 10 s on the CPU. The results of the simulation are compared against data from a pixel-readout LArTPC prototype

Characterization of the karyotype of proasellus meridianusby differential staining techniques

The genome of Proasellus meridianus (2 n= 10) contains two kinds of constitutive heterochromatin: one, polymorphic and stainable with Chromomycin A3 located on certain telomeres, and the other centromeric and stainable with Hoechst 33258, visible only at pachytene. The NORs stainable with silver nitrate are terminal and located on at least three pairs of chromosomes. In diakinesis and first meiotic metaphase, usually the silver technique differentially stains the centromeric area of only one of the two sister chromatids of each homologue. This indicates a direct relationship between silver staining and kinetochore function. Surface spread of testicular tissue displays five synaptonemal complexes which are homogeneous throughout their length