Waveform engineering in integrated harmonic oscillators: analysis and examples

openThe thesis analyzes the effect of the presence of a 2nd harmonic resonance in the differential LC oscillator’s tank, going inside the different effect that it causes on waveform shapes and phase noise improvement, with different mechanisms. The above analysis is carried out considering different known topologies of harmonic oscillators understanding in which topologies the tecnicque gives advantages in terms of final phase noise of the oscillator

Tuning the Drug Release from Antibacterial Polycaprolactone/Rifampicin-Based Core-Shell Electrospun Membranes: A Proof of Concept

The employment of coaxial fibers for guided tissue regeneration can be extremely advantageous since they allow the functionalization with bioactive compounds to be preserved and released with a long-term efficacy. Antibacterial coaxial membranes based on poly-epsilon-caprolactone (PCL) and rifampicin (Rif) were synthesized here, by analyzing the effects of loading the drug within the core or on the shell layer with respect to non-coaxial matrices. The membranes were, therefore, characterized for their surface properties in addition to analyzing drug release, antibacterial efficacy, and biocompatibility. The results showed that the lower drug surface density in coaxial fibers hinders the interaction with serum proteins, resulting in a hydrophobic behavior compared to non-coaxial mats. The air-plasma treatment increased their hydrophilicity, although it induced rifampicin degradation. Moreover, the substantially lower release of coaxial fibers influenced the antibacterial efficacy, tested against Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. Indeed, the coaxial matrices were inhibitory and bactericidal only against S. aureus, while the higher release from non-coaxial mats rendered them active even against E. coli. The biocompatibility of the released rifampicin was assessed too on murine fibroblasts, revealing no cytotoxic effects. Hence, the presented coaxial system should be further optimized to tune the drug release according to the antibacterial effectiveness

Prvo izvješće o algi Lomentaria hakodatensis (Lomentariaceae, Rhodophyta) u venecijanskoj laguni (Jadran, Sredozemlje)

Lomentaria hakodatensis Yendo, known from China, Japan, Korea, and the Pacific coasts of North America, was recorded for the first time in the lagoon of Venice on the Adriatic Sea in 2000. Specimens in the reproductive stage had tetrasporophytes, male, and female gametophytes. Morphological, anatomical, and reproductive features of the thalli are described and the occurrence of the species in the lagoon is discussed. Data on associated algae are presented. This species was recently found in France, Spain, Russia, the Hawaiian Islands, and Australia.Lomentaria hakodatensis Yendo nalazimo u Kini, Koreji i na obalama Tihog oceana u Sjevernoj Americi. Po prvi puta je zabilježena u reproduktivnom stadiju u venecijanskoj laguni, Jadransko more. U 2000. godini pronađene su tetrasporofite i muške i ženske gamete L. hakodatensis. Opisana su morfološka, anatomska i reproduktivna svojstva talusa i njihova učestalost u venecijanskoj laguni. Također su izneseni podatci o vegetaciji algi. Nalazi ove vrste se u posljednje vrijeme javljaju u Francuskoj, Španjolskoj, Rusiji, na Havajskom otočju i Australiji