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- 저자 : Armaroli, Nicola (검색결과 2 건)
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Cancer Prevalence in Easter Island Population - 2006-2010
Rius, Eduardo Bravo,Armaroli, Pabla Yaikin,Contreras, Gustavo Saint-Pierre Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.5
In Easter Island, population is composed by original habitants, the Rapa Nui culture and introduced people, mainly from continental Chile, who have a different ethnic origin. The aim of this research was to describe cancer frequency in resident population in Easter Island, and secondarily compare the findings with other islands of Polynesia and continental Chile. We reviewed the statistics of patients treated in Hanga Roa Hospital during the period 2006-2010, finding a total of 49 patients with cancer during the study. The most frequent cancers in Easter Island's people were breast cancer (8 cases), skin (8 cases), cervical (8 cases), lung (5 cases) and gastric (4 cases). According to gender, in females the most frequent cancer was breast, followed by skin and cervical, while in men, lung, prostate and hematopoietic cancers were the most frequent. Most cases of cervical cancer occurred in women of Rapa Nui ethnicity, while most skin cancers were found in non-Rapa Nui people. In case of the most common cancer in Easter Island, education (e.g. Papanicolaou and mammography screening) and prevention in the community (e.g. use sun block, avoid cigarettes) should be useful tools to reduce incidence.
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Tunable photophysical properties of phenyleneethynylene based bipyridine ligands
James, P.V.,Yoosaf, K.,Kumar, Jatish,Thomas, K.George,Listorti, Andrea,Accorsib, Gianluca,Armaroli, Nicola Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.10
A bipyridine-based system with phenyleneethynylene at the 4,4' positions (1) and its p-methyl (2) and p-methoxy (3) substituted derivatives were synthesized via Sonogashira coupling reactions. The photophysical properties of 1-3 and their related $H^+$ and $Zn^{2+}$ adducts (1:$H^+$-3:$H^+$ and 1:$Zn^{2+}$-3:$Zn^{2+}$) were investigated, as a function of solvent polarity, by using steady-state and time-resolved spectroscopic techniques. Molecular systems 1-3 exhibit trans conformation, whereas adducts with $H^+$ and $Zn^{2+}$ are conformationally locked cis species. The unsubstituted compound 1 emits at 360 nm with low fluorescence quantum yield (${\Phi}_{fl}$ = 0.2%) regardless of the solvent polarity. Fluorescence spectra of 2 and 3 are bathochromically shifted in polar solvents, and the p-methoxy (3) derivative possesses ${\Phi}_{fl}$ as high as 12%. Complexation of 1-3 with $H^+$ or $Zn^{2+}$ in acetonitrile causes red-shift of the lowest energy absorption bands, whereas dramatic changes of the emission properties are found as a function of the electron donating ability of the substituents on the phenyleneethynylene moiety ($-CH_3$ or $-OCH_3$), suggesting a charge-transfer character of the lowest electronic transition of 1-3. 1:$H^+$, 1:$Zn^{2+}$, 2:$H^+$ and 2:$Zn^{2+}$ exhibit intense fluorescence with ${\Phi}_{fl}$ up to 33% (1:$Zn^{2+}$) whilst 3:$H^+$ and 3:$Zn^{2+}$ are found to be weakly emissive. The singlet radiative and non-radiative rate constants of compounds and complexes were determined, along with triplet parameters, via phosphorescence and transient absorption spectroscopy. More conclusive evidence regarding the protonation of bipyridine nitrogen atoms of compounds 1-3 were obtained through $^1H$ NMR titration studies. These studies indicate that the conjugate molecular systems based on 2,2'-bipyridine and phenyleneethenylenes possess tunable optical properties which can be further utilized for preparing organic and inorganic luminophores with potential application in optoelectronic systems.
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