Antimutagenic and antiradical properties of flavones from the roots of Scutellaria baicalensis georgi

The four flavonoids baicalin, baicalein, wogonoside, and wogonin have been isolated from Scutellaria baicalensis (Lamiaceae) root extract as main bioactive components. We evaluated their antimutagenic activity as potential chemopreventive natural substances using the Ames test. Free radical scavenging properties have also been measured with the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Both crude extract and isolated flavone glycosides and aglycones have antimutagenic and free radical scavenging properties. The lipophilic flavone baicalein has been confirmed to be the most powerful antimutagen among the compounds tested.     

Probleme und Lösungen beim Feuchtigkeitsschutz des Mauerwerks von Baudenkmälern am Beispiel zweier großer Barockbauten in Wrocław

Problems concerning damp‐proofing brick‐laid historic building – shown on the example of two huge baroque structures in Wrozław. Most brick‐laid historic buildings in Poland are in bad technological condition due to lack of proper damp and water insulations, hence they need immediate renovation. Water is the biggest enemy of building constructions, especially of historic structures. The main source of dampness in buildings is rainwater, ground capillary water and water present in humid air, absorbed by porous, hygroscopic materials. It is a difficult task to design and later effect the correct and efficient damp‐proofing, and requires specific interdisciplinary knowledge. The article describes some chosen problems that appeared in the course of designing and making damp insulations in two huge historic priceless baroque buildings situated near the Odra River in Wrocław, namely, the main building of the University of Wrocław and the building of National Ossolinski Institute in Wrocław.     

A portrait photo-to-tattoo transform based on digital tattooing

Tattooing portraits of loved ones is a popular form of love expression and tribute. Tattooing portraits is complicated and challenging because of detailed facial expressions and unique characters of each person. Currently, it is hard for clients to give clear instructions on tattoo designs to tattooists, because there is no effective way to see a portrait tattoo before putting it on the body. In this paper, an algorithm which transforms a given portrait photo to a portrait tattoo is proposed. It takes a portrait photo, a reference portrait tattoo image, a skin image and a set of parameters as inputs. The portrait photo is the person’s face whom the client wants to put on his/her skin. The reference portrait tattoo image is used to control the color and style of the synthetic portrait tattoo. The skin image is taken from the skin region where the client wants to tattoo. By adjusting the parameters, portrait tattoos with different characteristics can be generated. The proposed algorithm uses a series of tailor-made image processing methods and a digital tattoo needle model to perform digital tattooing on the skin image. Comparing with the state-of-the-art style transfer methods, the proposed algorithm produces more realistic portrait tattoos.

     

Fatigue strength testing of LTCC and alumina ceramics bonds

In this paper the results of fatigue strength tests of ceramic joints are presented. These tests have been performed on the samples subjected to thermal and vibration fatigue as well as on the reference samples without any additional loads. The main goal of the investigation was to determine the strength of hybrid ceramics joints using tensile testing machine. The experiment enabled evaluation of fatigue effects in the mentioned joints. Geometry of test samples has been designed according to FEM simulations, performed in ANSYS FEM environment. Thermal stress as well as the stress induced by vibrations have been analyzed in the designed model. In the experiments two types of ceramics have been used ?? LTCC green tape DP951 (DuPont) and alumina ceramic tape. The samples have been prepared by joining two sintered ceramic beams made of different types of material. The bonds have been realized utilizing low temperature glass or a layer of LTCC green tape.     

Iron Complexes of Flavonoids-Antioxidant Capacity and Beyond

Flavonoids are common plant natural products able to suppress ROS-related damage and alleviate oxidative stress. One of key mechanisms, involved in this phenomenon is chelation of transition metal ions. From a physiological perspective, iron is the most significant transition metal, because of its abundance in living organisms and ubiquitous involvement in redox processes. The chemical, pharmaceutical, and biological properties of flavonoids can be significantly affected by their interaction with transition metal ions, mainly iron. In this review, we explain the interaction of various flavonoid structures with Fe(II) and Fe(III) ions and critically discuss the influence of chelated ions on the flavonoid biochemical properties. In addition, specific biological effects of their iron metallocomplexes, such as the inhibition of iron-containing enzymes, have been included in this review.