Mitotic chromosomes are the iconic structures into which the genome is packaged to ensure its accurate segregation during mitosis. Although they have appeared on countless journal cover illustrations, there remains no consensus on how the chromatin fiber is packaged during mitosis. In fact, work in recent years has both added to existing controversies and sparked new ones. By contrast, there ha...

The spectro-angular light scattering measurements of individual microscopic objects are presented. Using spectroscopic quantitative phase microscopy and Fourier transform light scattering, the 2D angle-resolved light scattering intensity and phase patterns are measured in a spectral range of 450-750 nm and an angular range of -70-70°. The spectro-angular light scattering measurements of individ...

Using palladium-catalyzed Suzuki polycondensation, we synthesized new light-emitting fluorene copolymers containing the dicyano derivatives of stilbene and phenanthrene characterized them by gel permeation chromatography, UV-vis absorption spectroscopy, spectrofluorimetry, cyclic voltammetry. The photoluminescence spectra polymers show significant energy transfer from segments to dicyanostilben...

This article reports on a gallium-nitride (GaN) low-noise amplifier (LNA) monolithic microwave integrated circuit (MMIC) with 3-dB gain bandwidth (BW) from 63 to 101 GHz. The MMIC is fabricated in the Fraunhofer IAF 70-nm GaN-on-silicon-carbide (SiC) high-electron-mobility transistor (HEMT) technology. four-stage common-source LNA exhibits an average noise figure (NF) of 3 dB for measured frequ...

A virtual chemical spectrophotometer for the simultaneous analysis of nickel (Ni) and cobalt (Co) was developed based on an artificial neural network (ANN). The developed ANN correlates the respective concentrations of Co and Ni given the absorbance profile of a Co-Ni mixture based on the BeerâĂŹs Law. The virtual chemical spectrometer was trained using a 3-layer jump connection neural network ...

We demonstrate laser cooling of trapped beryllium ions at 313 nm using a frequency-doubled extended cavity diode laser operated at 626 nm, obtained by cooling a ridge waveguide diode laser chip to -31°C. Up to 32 mW of narrowband 626 nm laser radiation is obtained. After passage through an optical isolator and beam shaping optics, 14 mW of 626 nm power remains of which 70% is coupled into an ex...

Imaging fibrillar amyloid-b deposition in the human brain in vivo by positron emission tomography has improved our understanding of the time course of amyloid-b pathology in Alzheimer’s disease. The most widely used amyloid-b imaging tracer so far is C-Pittsburgh compound B, a thioflavin derivative but other Cand F-labelled amyloid-b tracers have been studied in patients with Alzheimer’s diseas...