Search results for "Opus"

Octopus, a computational framework for exploring light-driven phenomena and quantum dynamics in extended and finite systems

2020

Over the last few years, extraordinary advances in experimental and theoretical tools have allowed us to monitor and control matter at short time and atomic scales with a high degree of precision. An appealing and challenging route toward engineering materials with tailored properties is to find ways to design or selectively manipulate materials, especially at the quantum level. To this end, having a state-of-the-art ab initio computer simulation tool that enables a reliable and accurate simulation of light-induced changes in the physical and chemical properties of complex systems is of utmost importance. The first principles real-space-based Octopus project was born with that idea in mind,…

Family Firm Heterogeneity and Tax Aggressiveness: A Quasi-Experimental Analysis of the Impact of Different Family Generations

2021

This paper analyses tax aggressiveness in family firm generations. Moreover, taking into account the heterogeneity in family firms, we check whether the successive generations in control show different tax avoidance behaviour. The empirical evidence, based on the quasi-experiment of the 2012 Spanish thin capitalization rule, reveals that there is a positive relationship between tax aggressiveness and successive generations. Moreover, the founder and second generations follow a similar conservative tax avoidance approach, whereas the third and fourth generations are found to be more tax aggressive.

Zinātnisko rakstu un to autoru citējamības tendenču izvērtēšana un salīdzināšana

2021

Mūsdienās zinātniekiem ir grūti izvērtēt pētījumu virzienu tendences, jo esošie publikāciju meklēšanas risinājumi nesniedz pietiekami smalkas datu savākšanas un analīzes iespējas. Bakalaura darbā tiks veidots risinājums automatizētai tīmekļa pārmeklēšanai, datu tīrīšanai un analīzei. Šis risinājums sniegs plašāku ieskatu nodefinētās zinātnes jomās, un sniegs iespēju novērtēt visperspektīvākos pētījumu virzienus.

Modelling the effect of ethanol on growth rate of food spoilage moulds

2005

The effect of ethanol (E) on the radial growth rate (mu) of food spoilage moulds (Aspergillus candidus, Aspergillus flavus, Aspergillus niger, Cladosporium cladosporioides, Eurotium herbariorum, Mucor circinelloides, Mucor racemosus, Paecilomyces variotii, Penicillium chrysogenum, Penicillium digitatum, Rhizopus oryzae and Trichoderma harzianum) was assessed in Potato Dextrose Agar (PDA) medium at a(w) 0.99, 25 degrees C. In order to model this effect, the Monod type equation described previously by Houtsma et al. (Houtsma, P.C., Kusters, B.J.M., de Wit, J.C., Rombouts, F.M., Zwietering, M.H., 1994. Modelling growth rates of Listeria monocytogenes as a function of lactate concentration. Int…

Zebrafish and other aquatic models in Mediterranean labs; ZEBRAFISH, KILLIFISH, OCTOPUS... AND BEYOND

2017

α-Conotoxins EpI and AuIB switch subtype selectivity and activity in native versus recombinant nicotinic acetylcholine receptors

2003

The Xenopus laevis oocyte expression system was used to determine the activities of alpha-conotoxins EpI and the ribbon isomer of AuIB, on defined nicotinic acetylcholine receptors (nAChRs). In contrast to previous findings on intracardiac ganglion neurones, alpha-EpI showed no significant activity on oocyte-expressed alpha3beta4 and alpha3beta2 nAChRs but blocked the alpha7 nAChR with an IC50 value of 30 nM. A similar IC50 value (103 nM) was obtained on the alpha7/5HT3 chimeric receptor stably expressed in mammalian cells. Ribbon AuIB maintained its selectivity on oocyte-expressed alpha3beta4 receptors but unlike in native cells, where it was 10-fold more potent than native alpha-AuIB, had…