Optical absorption and photoluminescence studies of Eu3+-doped phosphate and fluorophosphate glasses

Structural and spectroscopic investigations on Eu3+-doped alkali fluoroborate glasses

Europium doped zinc-tellurite glasses modified with LiF, Na2 O+L i 2O and Na2 O+L i2 O+N b 2O5 were prepared by the conventional melting procedure and their thermal, structural and optical properties were investigated Differential thermal analysis curves in the temperature range 30–1200 ◦ Ca t a heating rate of 10 ◦ C min −1 were used to determine the thermal properties such as glass transition, crystallization and melting temperature FT-IR spectra were used to analyse the glass structure The spectroscopic properties including absorption and emission spectra and fluorescence lifetime of Eu 3+ ions were measured A strong red fluorescence is observed from the 5 D0 level of Eu 3+ ions in these glasses The relative luminescence intensity ratio (R )o f 5 D0→ 7 F2 to 5 D0→ 7 F1 transitions has been evaluated to estimate the local site symmetry around the Eu 3+ ions The emission spectra of these glasses show a complete removal of degeneracy for the 5 D0→ 7 F1 transition of Eu 3+ ions Based on the energy level data obtained from the absorption and emission measurements, free-ion energy level analysis has been carried out Second rank crystal-field parameters have been calculated together with the crystal-field strength parameter by assuming the C2v symmetry for the Eu 3+ ions in these glasses The crystal-field parameters are found to be higher in binary zinc-tellurite glasses The trend of variation of crystal-field strength with glass composition is found to be more or less opposite to that of R in the present glasses The effect of temperature on the luminescence from 5 D1 level is studied The decay from the 5 D0 level is found to be exponential and the lifetime is shorter than those found in Eu 3+ -doped borate, phosphate and fluoride based glasses

http://iopscience.iop.org/article/10.1088/0022-3727/40/18/038/pdf

Thermal, structural and optical properties of Eu3+-doped zinc-tellurite glasses

Photoluminescent properties of the europium tris(thenoyltrifluoroacetonate) dihydrate [Eu(TTA)3(H2O)2] incorporated in epoxy resin in the solid state are reported. The polymeric Eu3+ complex and the precursor compound were characterized by elemental analysis, thermogravimetry (TG), differential scanning calorimetry (DSC), infrared spectroscopy, nuclear magnetic resonance (NMR), and electronic spectroscopy. Due to efficient energy transfer from the polymer to the rare earth ion, the polymer phosphorescence intensity was observed to decrease with an increase of the Eu3+ ion concentration. High values of the Ω2 intensity parameter were obtained, reflecting the hypersensitive character of the 5D0 7F2 transition and indicating that the Eu3+ ions are in a highly polarizable chemical environment. This is consistent with systems containing epoxy resin that generally show a higher value for the Ω4 parameter as a consequence of the difference in the basicity of the oxygen donor from the polymer. Lifetime measurement (τ = 0.442 ms) suggests that the Eu3+ luminescence has a higher efficiency than in the case of hydrated compound (τ = 0.260 ms). The emission quantum efficiency shows higher luminescence for the polymer containing 1% of Eu3+-β-diketonate complex. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2716–2726, 2002

Enhancement of the luminescent intensity of the novel system containing Eu3+-β-diketonate complex doped in the epoxy resin

Enhanced emission from Eu(III) β-diketone complex combined with ether-type oxygen atoms of di-ureasil organic-inorganic hybrids

https://www.repositorio.ufop.br/bitstream/123456789/1217/1/ARTIGO_LuminescenceBehaviorthenoylTrifluoroacetonate.pdf

Luminescence behavior of Eu3+ with thenoyltrifluoroacetonate, sulfoxides and macrocyclics

Candida endocarditis is a rare infection associated with high mortality and morbidity. There are still some controversies about Candida endocarditis treatment, especially about the treatment duration. We report a case of a Candida parapsilosis endocarditis that presented as a lower limb ischemia. The patient was surgically treated with a cryopreserved homograft aortic replacement. We used intravenous fluconazole 800 mg as initial treatment, followed with 12 months of 400 mg fluconazole per os. The patient outcome was good.

Candida parapsilosis prosthetic valve endocarditis

The changing epidemiology of carbapenem-resistant Klebsiella pneumoniae in Southern European countries is challenging for infection control, and it is critical to identify and track new genetic entities (genes, carbapenemases, clones) quickly and with high precision. We aimed to characterize the strain responsible for the first recognized outbreak by an NDM-1-producing K. pneumoniae in Portugal, and to elucidate its diffusion in an international context. NDM-1-producing multidrug-resistant K. pneumoniae isolates from hospitalized patients (2018–2019) were characterized using FTIR spectroscopy, molecular typing, whole-genome sequencing, and comparative genomics with available K. pneumoniae ST11 KL105 genomes. FT-IR spectroscopy allowed the rapid (ca. 4 h after incubation) identification of the outbreak strains as ST11 KL105, supporting outbreak control. Epidemiological information supports a community source but without linkage to endemic regions of NDM-1 producers. Whole-genome comparison with previous DHA-1-producing ST11 KL105 strains revealed the presence of different plasmid types and antibiotic resistance traits, suggesting the entry of a new strain. In fact, this ST11 KL105 clade has successfully disseminated in Europe with variable beta-lactamases, but essentially as ESBL or DHA-1 producers. We expand the distribution map of NDM-1-producing K. pneumoniae in Europe, at the expense of a successfully established ST11 KL105 K. pneumoniae clade circulating with variable plasmid backgrounds and beta-lactamases. Our work further supports the use of FT-IR as an asset to support quick infection control.

https://www.mdpi.com/2079-6382/11/1/92/pdf?version=1641983286

NDM-1 Introduction in Portugal through a ST11 KL105 Klebsiella pneumoniae Widespread in Europe

HIV clinical presentation in the acute stage is variable and some of its virological and immunological aspects are not completely understood Most cases of HIV- associated reactive hemophagocytic syndrome have been reported in patients with advanced stages of HIV and to our knowledge, there are only 8 cases in the English literature presenting during acute HIV infection, most in East Asia, being this the first case in a European patient We report a case of a European Caucasian 27- year old woman with a primary HIV- infection presenting with extremely low CD4+ T cell count who developed a haemophagocytic syndrome after starting ART and in whom we documented a very unusual serological and virological response, characterized by an impaired HIV- antibody production and a 12 month time frame to reach an undetectable viral load, despite no evidence of resistance This case report apart from describing an unusual clinical presentation of an acute HIV infection as hemophagocytic syndrome provides useful information that might contribute for understanding some subtle issues in acute HIV infection, namely the dynamics of virological and immunological aspects after antiretroviral therapy initiation

/pdf/acute-hiv-infection-presenting-as-hemophagocytic-syndrome-38fsuo0apb.pdf

Rita Ferraz

Papers

Luminescence behavior of Eu3+ with thenoyltrifluoroacetonate, sulfoxides and macrocyclics

Candida parapsilosis prosthetic valve endocarditis

NDM-1 Introduction in Portugal through a ST11 KL105 Klebsiella pneumoniae Widespread in Europe

Acute HIV infection presenting as hemophagocytic syndrome with an unusual serological and virological response to ART

Presentation and diagnosis of acute Q fever in Portugal - A case series.