1,808 research outputs found
A New One-Pot Way to Prepare Enzyme-Containing Coordination Polymers by Sonochemistry
No full textEnzyme-containing Coordination Polymers (CPs) were prepared by a one-pot sonochemical method, mixing Glucose Oxidase (GOx) enzyme, 4,4'-bipyridine as spacer ligand, and chloride zinc salt. The reaction took place in a very short time (a few minutes) with a minimum use of solvents compared to conventional methods. The obtained composite material, named GOx-[Zn(4,4'-bipy)Cl2]∞, resulted from embedding the GOx molecules into uniformly sized [Zn(4,4'-bipy)Cl2] nanocrystals. The structural and thermal characterization, confirmed that the adopted strategy allows the preparation of hybrid bio-nanomaterials in a very fast, facile and eco-friendly method, by simply synthesising the [Zn(4,4'-bipy)Cl2] nanocrystals in the presence of the enzyme
Schermi. Immagini, corpi, condivisioni
No full textIn this book the author investigates the digital image proliferation of our times from an interdisciplinary point of view. Starting from the Visual Culture theoretical frame, Valentina Mignano explores the ways in which we interact with the screen, dealing with the "screen experience" in the first years of the network societ
Characterization of the volatile constituents in the essential oil of Pistacia lentiscus L. from different origins and its antifungal and antioxidant activity
No full textEssential oil (EO) from aerial parts (leaves, juvenile branches, and flowers when present) of Pistacia
lentiscus L. growing wild in five localities of Sardinia (Italy) was extracted by steam-distillation (SD)
and analyzed by gas chromatography (GC), FID, and GC-ion trap mass spectrometry (ITMS). Samples
of P. lentiscus L. were harvested between April and October to study the seasonal chemical variability
of the EO. A total of 45 compounds accounting for 97.5-98.4% of the total EO were identified, and
the major compounds were R-pinene (14.8-22.6%), â-myrcene (1-19.4%), p-cymene (1.6-16.2%),
and terpinen-4-ol (14.2-28.3%). The yields of EO (v/dry w) ranged between 0.09 and 0.32%. Similar
content of the major compounds was found in samples from different origins and seasonal variability
was also observed. The EOs were tested for their antifungal activity against Aspergillus flavus,
Rhizoctonia solani, Penicillium commune, Fusarium oxysporum. Two samples were weakly effective
against Aspergillus flavus. Furthermore, terpinenol and R-terpineol, two of the major components of
EO of Pistacia lentiscus L., totally inhibited the mycelian growth of A. flavus. Quite good antioxidant
activity of the EO was also found
Chemical composition, Seasonal variability, and Antifungal Activity of Lavandula stoechas L. ssp. stoechas Essential Oils from stem/leaves and Flowers.
No full textAlternative Silica Sources in the Synthesis of Ordered Mesoporous Silica
No full textIn this work, the influence of the use of alternative inexpensive silica sources on the structural, morphological and textural properties of MCM-41 like mesoporous materials to be used for biomedical applications has been investigated. The Liquid Crystal Template Method has been used to prepare the ordered mesoporous structured materials according to a novel composition starting from fumed silica or granular silica gel as alternative silica sources. The obtained materials have been characterized by X-ray Powder Diffraction, Transmission and Scanning Electron Microscopy, and nitrogen sorption, which showed for both samples the formation of the ordered hexagonal pore arrangement typical of a MCM-41 material. However, when using fumed silica, higher long-range hexagonal pore ordering as well as higher surface area have been obtained (1030 vs. 763 m2/g). For comparison, the features of a commercial silica mesostructured MCM-41 type have been investigated as well. Again, the silica fumed based sample has showed higher long-range hexagonal pore ordering, higher surface area and wall thickness. Preliminary stability studies on the fumed silica based material showed a decrease in the pore ordering at the end of the third year after the synthesis
ENTREPRENEURSHIP AND FEMALE ENTREPRENEURSHIP IN MARAMURES COUNTY
No full textInitiating and developing a business involves a considerable risk and a sustained effort in order to defeat the inertia against what is new. The person initiating a business, assuming the responsibility and risk of its development and benefiting from theentrepreneurship, female entrepreneurship, profit, businesses
The archaeological excavation at the time of social media: research and storytelling at Bruncu ‘e S’omu-Villa Verde (Sardinia, Italy)
No full text
Paesaggi agricoli della prima età del Bronzo: un approccio GIS alla Grotta di Monte Meana (Sardegna sud-occidentale)
No full textNella Sardegna sud-occidentale è stata indagata negli anni 2008-
2012 la grotta di Monte Meana - Santadi localizzata in un contesto ambientale caratterizzato da un’area valliva
attualmente destinata all’agricoltura e al pascolo. L’indagine archeologica ha permesso di individuare due aree
di frequentazione datate alle fasi antica e media dell’età del Bronzo: 2017-1751 cal BC e 1914-1641 cal BC.
Queste due aree hanno rilevato macroresti vegetali carbonizzati di cereali, legumi e frutta selvatica. Analisi pol liniche condotte nei due contesti archeologici hanno rilevato una vegetazione del tutto simile a quella attuale.
Attraverso un modello territoriale sviluppato in ambiente GIS, si è tentato di individuare i suoli pedologica mente adatti allo sfruttamento agricolo, verifcando le relazioni di vicinanza (cost surface analysis) e visive
(viewshed analysis). I risultati hanno mostrato una stretta relazione del gruppo umano con il suo territorio in
funzione dello sfruttamento agricolo
The use of initial tocolysis and maintenance tocolysis in preterm birth : guideline-based approach or off-label use - a survey on the current application in Switzerland
No full textAuthor Valentina Schedl, BscMasterarbeit Universität Linz 202
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