The article presents remarks on outdoor reconstructions of primeval and medieval bridge crossings in Central Europe on the example of the selected constructions with a wooden structure. The presented bridges were the subject of archaeological research on terrestrialised lake and river reservoirs or the subject of underwater prospection. Firstly the article presents the construction of primeval bridges, by showing the bridge of the defensive settlement of the Lusatian culture from the 8th century BC in...

The sea urchin embryo develops a calcitic endoskeleton through intracellular formation of amorphous calcium carbonate (ACC). Intracellular precipitation of ACC, requires HCO3-/CO32- concentrating as well as proton export mechanisms to promote calcification. These processes are of fundamental importance in biological mineralization, but remain largely unexplored. Here we demonstrate that the calcifying primary mesenchyme cells (PMCs) utilize Na+/H+- exchange (NHE) mechanisms to control cellular pH homeostasis during maintenance of the skeleton. During skeleton re-calcification, pHi of...

Ausgrabungen und Georadarmessungen in der Nekropole Tuna el-Gebel haben 2018 und 2019 neue Erkenntnisse über das Areal ergeben. Teilweise freigelegt wurden ein Steinbau (GB 73) und ein Gebäude aus ungebrannten Lehmziegeln (GB 72). Der Steinbau wurde in der Kaiserzeit als Grabbau genutzt, darüber hinaus verweist die Keramik auf eine Nachnutzung in der Spätantike. Die Anzahl und die Typen der Gefäße sprechen für die Ansiedlung einer größeren Gruppe von Menschen. GB 72 war zweistöckig und verfügte...

Insects produce a variety of adhesives for diverse functions such as locomotion, mating, egg or pupal anchorage to substrates. Although they are important for the biology of organisms and potentially represent a great resource for developing new materials, insect adhesives have been little studied so far. Here, we examined the adhesive properties of the larval glue of D. melanogaster. This glue is made of glycosylated proteins and allows the animal to adhere to a substrate...

This paper describes a mixed methods analysis of papers published at the ACM Web Science Conference series from 2009 to 2016, using co-citation analysis, bibliographic coupling, natural language processing, topic modelling and network visualisation techniques. The knowledge base of the Web Science community and the knowledge transfer from the ACM Web Science Conference series are studied, revealing major themes and key authors as a map of Web Science. In particular, the foundations of the Web...

Upper-ocean velocities along the cruise track of Maria S. Merian cruise MSM88/1 were continuously collected by a vessel-mounted Teledyne RD Instruments 75 kHz Ocean Surveyor ADCP. The transducer was located at 6 m below the water line. The instrument was operated in narrowband mode with 8 m bins and a blanking distance of 8 m, while 100 bins were recorded using a pulse of 1.45 seconds. The ship's velocity was calculated from position fixes obtained...

A challenge in the Bachelor's studies in Biology, is to strive for a balance between reducing the teaching of practical scientific experiments to what is feasible in a short time, and teaching "real" science in undergraduate labs for high numbers of participants. We describe a lab in behavioural biology, with the primary focus on the student learning. However, also the underlying scientific question and the results of the experiment, namely the behaviour of the three-spined...

Aim: Alien species successfully colonize new ranges if they encounter favourable environmental conditions there and possess traits that match new challenges. Climate matching approaches comparing native and exotic ranges mostly consider temperature and precipitation niches of alien species, but have largely ignored UV-B radiation. UV-B fundamentally differs between hemispheres, with much higher levels at southern than at northern latitudes. Consequently, UV-B might act at the global scale and present a so far neglected filter that...

Journal of Global Archaeology, 2020

Madrider Mitteilungen, 57 (2016)

Exotic plant species can evolve adaptations to environmental conditions in the exotic range. Furthermore, soil biota can foster exotic spread in the absence of negative soil pathogen-plant interactions or because of increased positive soil biota-plant feedbacks in the exotic range. Little is known, however, about the evolutionary dimension of plant-soil biota interactions when comparing native and introduced ranges. To assess the role of soil microbes for rapid evolution in plant invasion, we subjected Verbascum thapsus,...

The ongoing warming of the Earth’s atmosphere is projected to cause a northward shift of species’ distributions, as they track their climatic optimum. In the rapidly warming Arctic, this has already led to an increase of shrubs in tundra ecosystems. While this northern expansion of woody biomass has been studied relatively extensively over the last decade, little research has been devoted to shrub growth responses at the southern margins of Northern Hemisphere shrubs. Here, we...