Search results for "Iode"

Blending PLLA with PLA so as to tune the biodegradabilty of polymeric scaffolds for soft tissue engineering

2008

DNA analysis as tool for identification of bacteria in archaeological waterlogged wood

2014

Abstract In this work molecular techniques were applied in order to integrete the results obtained by Optical (OM) and Scanning Electron (SEM) Microscopy, to understanding and assessing the changes in the anatomical structure of archaeological waterlogged wood (Pinus sp.) induced by bacteria colonization. Observation of wooden thin sections revealed by OM showed the presence of black and dark -brown areas (must probably due to sulphur compounds) and mineral concretions. The SEM micrographs revealed a specific cell wall alteration attributable to bacterial activity and abundant pyrite framboids (as single structure or clustered). The presence of sulfur compounds in archaeological waterlogged…

BIODEGRADING BIOFILMS ON INNOVATIVE BIOPOLYMERIC SUPPORTS

2022

ABSTRACT Water bioremediation is traditionally carried out using ‘ free ’ bacterial cells, however, in recent years, utilization of ‘immobilized’ bacterial cells on adsorbing matrices, has gained attention as a promising technique due to biotechnological and economic benefits (Sonawane et al., 2022). Bacterial biofilms show greater resilience, survival and degradative activity for longer periods than cells in the planktonic state (Alessandrello et al., 2017); moreover immobilization reduces bioremediation costs, eliminate cell dilution and dispersion in the environment (Bayat et al., 2015). Possible applications of immobilized biodegrading bacteria require long-term survival and maintenance…

Biomateriālu: Biodentīna un Minerāltrioksīda agregāta (MTA) izmantošana zobārstniecībā anonīmā aptauja

2020

Ievads: Šī pētījuma mērķis bija noskaidrot, kādu biomateriālu, MTA vai Biodentīnu ikdienā izmanto zobārsti Latvijā un kādi ir faktori to nosaka. Metodes: Šķērsgriezuma pētījums tika veikts starp zobārstniecības speciālistiem, kuri strādā dažādu Latvijas Republikas reģionu klīnikās. Anketa tika izveidota, lai iegūtu nepieciešamo informāciju par MTA un Biodentīna izmantošanu konservatīvajā zobārstniecībā un endodontijā. Pētījumu apstiprināja Latvijas Universitātes Kardioloģijas un reģeneratīvās medicīnas institūta zinātniskās izpētes ētikas komisija. Rezultāti: No respondentiem tika saņemtas 105 aizpildītas anketas, kuras arī tika iekļautas datu analīzē. Respondenti bija vispārējie zobārsti (…

LA MICROSCOPIA ELETTRONICA (SEM, CLSM) PER L’ANALISI DI MICROSISTEMI BIOLOGICI CHE COLONIZZANO I BENI CULTURALI

2012

RIASSUNTO - Il degrado dei materiali con cui sono realizzate le opere d’arte, è spesso causato dall’attività di macro e micro organismi (piante, insetti, licheni, alghe, batteri, attinomiceti etc.), denominati biodeteriogeni. Presenti in tutti gli habitat terrestri, costituiscono un serio problema per la conservazione sia in siti outdoor sia confinati, come biblioteche, archivi, istituti mussali, depositi e, comunque, in tutti quei luoghi dove si attua la conservazione/fruizione dei manufatti. In genere, non vi è luogo di conservazione che non mostri tracce di parziali o estese infestazioni/colonizzazioni che comportano alterazioni più o meno consistenti dei manufatti presenti. Le alterazio…

Cold-active molecules for a sustainable preservation and restoration of historic-artistic manufacts

2016

In the last decades biotechnology research provides sustainable alternatives to traditional procedures for preventive preservation of cultural assets. Recently, bioactive molecules (BMs) isolated from marine invertebrate organisms have been isolated and tested for bioremoval of protein layers (BMP) or to controlling microbial colonization (BMA), acting at temperature lower than 30°C. The Protease or Antimicrobial activity was tested on ad hoc assembled specimens and on different historic-artistic manufacts. In bio-removing protocol BMP molecules were applied as gelled solutions, in order to guarantees a selective action, respectful of constitutive materials and manufact integrity. Peculiari…

Biotechnology: Innovative Contributions to the Conservation and Restoration of Cultural Heritage

2014

As exhaustively showed during the conference "Molecular Biology and Cultural Heritage", held in Seville in 2003, molecular biology represents an important source of insight for the development of innovative protocols for the detection and characterization of microbial consortia colonizing historic-artistic manufacts. In particular, fungi and bacteria (frequently associated with green algae, cyanobacteria, lichens, etc), wide-spread in biosphere environments, are the main biological systems related to deterioration of cultural asset. Moreover in the aerosol of indoor environments, whre the manufacts are exposed or stored, complex microbiai communities may release some molecules with human (v…

Antibacterial biopolymeric foams: Structure–property relationship and carvacrol release kinetics

2019

Abstract In this work, the feasibility of antibacterial biopolymeric foams containing carvacrol (CRV) for potential food packaging applications was investigated. Sodium bicarbonate (SB) was chosen as foaming agent and a commercial biodegradable polymer, Mater-Bi® (MB), as a matrix. MB/SB and MB/SB/CRV systems were prepared by melt mixing and the foaming process was conducted in a laboratory press. The influence of foaming agent and antibacterial additive content was investigated. The foamed samples were characterized through morphological analysis, mechanical tests and measurements of CRV release kinetics. Moreover, a mathematical model, i.e. power law model, was used to fit the release dat…

The bioremediation potential of the Priolo Harbour (SR, Italy): isolation, identification and catabolic ability of hydrocarbonoclastic bacteria

2013

The petrochemical site of Priolo-Augusta-Melilli (Sicily, Italy), is a Site of National Interest (SIN) due to high levels of contamination of the coastline and its remediation is urgently needed. Successful remediation strategies relying on the catabolic potential of marine hydrocarbonoclastic bacteria (HCB) have been described. HCB are specialised hydrocarbon (HC)-degrading marine bacteria that use HC almost exclusively as unique carbon and energy source and become dominant in oil-impacted environments. In order to identify the key hydrocarbon degraders and explore the natural bioremediation potential of the contaminated area, sediment cores and sea water were collected inside the Priolo H…

Effect of temperature and organic nutrients on the biodegradation of linear alkylbenzene sulfonate (LAS) during the composting of anaerobically diges…

2004

Limits on the application of biosolids (anaerobically processed sludges from wastewater treatment plants) as fertilizers for the amendment of soil are becoming greater because of the accumulation of recalcitrant substances, making necessary the use of techniques that bring the concentration of xenobiotics to lower concentrations than those permitted. In general, the biosolids composting process is sufficient to reduce the usual concentration of linear alkylbenzene sulfonates (LAS) to low levels. In this work, an assessment is made on the effect of temperature in the capacity of enriched bacterial populations to biodegrade LAS, together with the influence that the available nutrients may hav…