Anomalous reaction-transport processes: the dynamics beyond the Mass Action Law

In this paper we reconsider the Mass Action Law (MAL) for the anomalous reversible reaction $A\rightleftarrows B$ with diffusion. We provide a mesoscopic description of this reaction when the transitions between two states $A$ and $B$ are governed by anomalous (heavy-tailed) waiting-time distributions. We derive the set of mesoscopic integro-differential equations for the mean densities of reacting and diffusing particles in both states. We show that the effective reaction rate memory kernels in these equations and the uniform asymptotic states depend on transport characteristics such as jumping rates. This is in contradiction with the classical picture of MAL. We find that transport can even induce an extinction of the particles such that the density of particles $A$ or $B$ tends asymptotically to zero. We verify analytical results by Monte Carlo simulations and show that the mesoscopic densities exhibit a transient growth before decay.Comment: 4 pages, 3 figure

Parallelization of chip-based fluorescence immuno-assays with quantum-dot labelled beads

This paper presents an optical concept for the read-out of a parallel, bead-based fluorescence immunoassay conducted on a lab-on-a-disk platform. The reusable part of the modular setup comprises a detection unit featuring a single LED as light source, two emission-filters, and a color CCD-camera as standard components together with a spinning drive as actuation unit. The miniaturized lab-on-a-disk is devised as a disposable. In the read-out process of the parallel assay, beads are first identified by the color of incorporated quantum dots (QDs). Next, the reaction-specific fluorescence signal is quantified with FluoSpheres-labeled detection anti-bodies. To enable a fast and automated read-out, suitable algorithms have been implemented in this work. Based on this concept, we successfully demonstrated a Hepatitis-A assay on our disk-based lab-on-a-chip

Milieukundige beoordeling van de opslag en toepassing van organisch bedrijfsafval/plantensnippers als bodemverbeterend middel in de landbouw; advies

Organisch bedrijfsafval en plantensnippers afkomstig uit de tuinbouw kan na compostering nuttig hergebruikt worden als bodemverbeterend middel in de landbouw, mits voldaan wordt aan wettelijke, milieukundige en landbouwkundige randvoorwaarden. In de onderhavige studie is organisch bedrijfsafval/plantensnippers beoordeeld dat rijk is aan fosfaat en zware metalen. Het gebruik als organisch bodemverbeterend middel als bedoeld in de ontheffingsaanvraag leidt tot te hoge giften aan fosfaat. Deze hoge giften zijn gelet op de fosfaatbehoefte van de gewassen die door de firma A. Dijkshoorn en Zn. geteeld worden, landbouwkundig gezien, niet nodig. Het gebruik van organisch bedrijfsafval/plantensnippers als fosfaatmeststof leidt tot te hoge vrachten aan met name chroom, nikkel, zink en arseen bij spiegeling aan de voor zuiveringsslib en compost toegelaten vrachten aan zware metalen. Milieu-verantwoorde toepassing van organisch bedrijfsafval/plantensnippers wordt daardoor niet bepaald door de waardegevende bestanddelen organische stof en nutriënten maar door de gehalten aan zware metalen

Azimuthally Resolved X-Ray Spectroscopy to the Edge of the Perseus Cluster

We present the results from extensive, new observations of the Perseus Cluster of galaxies, obtained as a Suzaku Key Project. The 85 pointings analyzed span eight azimuthal directions out to 2 degrees = 2.6 Mpc, to and beyond the virial radius r_200 ~ 1.8 Mpc, offering the most detailed X-ray observation of the intracluster medium (ICM) at large radii in any cluster to date. The azimuthally averaged density profile for r>0.4r_200 is relatively flat, with a best-fit power-law index of 1.69+/-0.13 significantly smaller than expected from numerical simulations. The entropy profile in the outskirts lies systematically below the power-law behavior expected from large-scale structure formation models which include only the heating associated with gravitational collapse. The pressure profile beyond ~0.6r_200 shows an excess with respect to the best-fit model describing the SZ measurements for a sample of clusters observed with Planck. The inconsistency between the expected and measured density, entropy, and pressure profiles can be explained primarily by an overestimation of the density due to inhomogeneous gas distribution in the outskirts; there is no evidence for a bias in the temperature measurements within the virial radius. We find significant differences in thermodynamic properties of the ICM at large radii along the different arms. Along the cluster minor axis, we find a flattening of the entropy profiles outside ~0.6r_200, while along the major axis, the entropy rises all the way to the outskirts. Correspondingly, the inferred gas clumping factor is typically larger along the minor than along the major axis.Comment: submitted to MNRA