Bioavailability of metals species in water ecosystem

Koncentrace volných kovových iontů je často jen malou částí celkové koncentrace kovu v prostředí. Přes tento malý obsah, je ve většině případů koncentrace volných kovových iontů klíčovým faktorem při určování biodostupnosti a toxicity pro organizmus. Membránová technika Donnan se používá k měření koncentrace volných kovových iontů a v této diplomové práci je ověřena pro směsi kovů (Pb + Cu) při absenci a přítomnosti malých organických ligandů. Olovo a měď jsou environmentálně důležité kovy díky své toxicitě a rozdílným vazebným vlastnostem ve vztahu ke studovaným ligandům.The free metal ion concentration is often only a small fraction of the total metal concentration in the environment. Despite their small amount, in most of the circumstances the free metal ion concentration is the key factor in determining metal bioavailability and toxicity for the organisms. The Donnan membrane technique is able to measure the free metal ion concentration and in this thesis, it is validated for metal mixtures (Pb + Cu) in absence and presence of small organic ligand mixtures. Lead and copper are environmental relevant metals due to their toxic properties and different binding properties relative to the studied ligands.

The smart textile problem and its implication for teaching

The 21st century has seen the textiles industry and academy face the challenge of smart textiles. There is a popular view that describes smartness in textiles as a synonym for responsive behaviour. This perception however is challenged by the idea that all natural textile materials change in reaction to its environment. A question therefore remains as to what responsive behaviour constitutes as smart behaviour. In other words, when does the responsive turn into smart? The textile industry heavily relies on weaving as the construction methodology for cloths. Weaving, and woven materials, have changed very little since the Stone Age. Even the Industrial Revolution only changed the speed and efficiency of weaving - but not the basic structure of woven materials themselves. The dramatic change that was introduced from the Industrial Revolution is the bonded dependency of structures potentials in the specifications of the machines. This link still rule textile manufacture today and the interesting thing here is that our weaving machines have only changed a little in over 250 years. The dramatic introduction and ever increasing development of new technologies and textile components has created, as a result, an inherent gap between cutting edge technologies, advanced material science and what could only be described as ancient textiles construction methodologies. This session will outline the issues concerning smart textiles. It will portray the weaver as a behaviourist learner and will introduce the formation of a new experimental learning space through a plantation of a rhizomatic strategy within a behaviourist discipline. The session will consequently discuss why such seemingly two incommensurable approaches to learning - behaviorism and rhizomatism - may come together and work alongside one another through a new agonistic and interdisciplinary space to allow the development of innovative textile structures. This session will appeal to textiles designers, makers, teachers and researchers from all creative disciplines. It will also appeal to those interested in pedagogic frameworks and research into academic structures and delivery of programs

Exclusive Production of J/ψ Mesons in the ZEUS Detector

Exclusive J/ψ production has been studied using the ZEUS detector at HERA. Two ranges of the photon virtuality, Q2 2 and 0.15 2 2 are examined. The latter is defined by requiring the scattered electron to be detected in the Beam Pipe Calorimeter under low angles. The J/ψ mesons have been identified via the decay J/ψ -> e+ e-. The cross sections are measured as a function of the photon-proton centre-of-mass energy, W. The data used were taken during the 1999 and 2000 running periods, which yielded an integrated luminosity of 68.7 pb-1. The measured W dependences are in agreement with each other and the values obtained in high-Q2 (2 2 2) measurements. This leads to the conclusion that J/ψ production is a hard process for all Q2 values and can be described with models based on perturbative QCD. Electron-pion separation of the ZEUS Transition Radiation Detector is measured. A method to combine TRD information and dE/dx measurements from the central drift chamber is developed and applied to the Q2 2 J/ψ sample

When Twilight Comes (I\u27m Thinking Of You)

Contains advertisements and/or short musical examples of pieces being sold by publisher.https://digitalcommons.library.umaine.edu/mmb-vp/6994/thumbnail.jp