Frequent occurrence of microbial resistance to biocides makes it necessary to find alternative antimicrobial substances for modern veterinary medicine. The aim of this study was to obtain biodegradable silver nanoparticle-containing (AgNPs) foils synthesized using non-toxic chemicals and evaluation of their activity against bacterial pathogens isolated from oral cavities of cats, dogs and horses. Silver nanoparticle foils were synthesized using sodium alginate, and glucose, maltose and xylose were used as reducing agents. The sizes of AgNPs differed depending on the reducing agent used (xylose < maltose < glucose). Foil without silver nanoparticles was used as control. Bacterial strains were isolated from cats, dogs and horses by swabbing their oral cavities. Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), Escherichia coli and extended-spectrum beta-lactamase (ESBL) producing E. coli were isolated on selective chromogenic microbiological media. The bactericidal effect of AgNPs foils obtained using non-toxic chemical compounds against E. coli, ESBL, S. aureus and MRSA isolated from oral cavities of selected animals was confirmed in this study. No statistically significant differences were observed between the foils obtained with different reducing agents. Therefore, all types of examined foils proved to be effective against the isolated bacteria.
Nanotechnology plays an important role in many fields of science and the economy. A special example of nanostructures is silver nanoparticles (AgNPs) created following the principles of green chemistry, i.e., without the use of toxic reducing compounds. The common tomato (Solanum lycopersicum) is a popular vegetable whose germination and growth process are studied by using, e.g., in vitro cultures. The aim of the experiment was to evaluate the inhibitory effect of the biodegradable gels containing silver nanoparticles on the development of microbial infection and to evaluate their influence on the germination degree of Tomato (Solanum lycopersicum) seeds in in vitro plant cultures. Based on macroscopic and microscopic observations, all experimental samples showed the presence of Gram-positive bacilli as well as mould fungi of the genus Rhizopus, Alternaria and Aspergillus. The study showed that the biocomponents containing silver nanoparticles obtained by using xylose as a reducing agent limit the development of microbial infection and stimulate the germination rate of tomato seeds. They could find their application as biodegradable raw materials in the production of modern disinfecting preparations for research in in vitro cultures. This study allowed to identify new research directions, especially to evaluate the metabolic regulation of seedlings treated with biodegradable silver nanoparticles.
Cel-problematyka zarządzania wiedzą nabiera coraz większego znaczenia, biorąc pod uwagę współczesne tendencje rynkowe. Celem artykułu jest przedstawienie specyfiki, podstawowych definicji, trendów w obszarze zarządzania wiedzą oraz wykazanie, że sukces dotyczący wdrażania zarządzania wiedzą jest zdeterminowany wieloma czynnikami. Jako kluczowe należy wskazać konkretne cechy organizacji, które wpływają na możliwości wdrożenia właściwego systemu zarządzania wiedzą. Aby urzeczywistnić maksymalizację wymierności efektów w tym zakresie, przedsiębiorstwo bez wątpienia powinno być aktywne, samodoskonalące się, ukierunkowane na rozwój i klientów. W opracowaniu zostały przedstawione zestawienia najbardziej popularnych modeli w tym zakresie. Metodologia badania-metoda obejmuje analizę literatury przedmiotu oraz spostrzeżenia własne autorów w zakresie obecnych tendencji zarządzania organizacjami. Wyniki-rezultaty dotyczyły stworzenia aktualnego poglądu w zakresie znaczenia wiedzy w zarządzaniu współczesnymi organizacjami. Oryginalność/wartość-w artykule przedstawiono bieżące podejścia modelowe w kontekście zarządzania wiedzą we współcześnie funkcjonujących organizacjach.
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