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Chiral supramolecular gold-cysteine nanoparticles: Chiroptical and nonlinear optical properties

Progress in Natural Science:Materials International 2016年第5期26卷 455-460页

作者： Isabelle Russier-Antoine fran.k bertorelle Alexander kulesza Antonin Soleilhac Amina Bensalah-Ledoux Stephan Guy Philippe Dugourd Pierre-fran?ois Brevet Rodolphe Antoine Univ Lyon Université Claude Bernard Lyon 1 CNRS Institut Lumière Matière

Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts to noble metal surfaces. We report a simple synthetic approach for the production of chiral gold-cysteine polymeric nanoparticles soluble in water. Conjugation of cysteine with gold in a polymeric way, leading to;0 nm diameter nanoparticles, resulted in the generation of new characteristic circular dichroism（CD） signals in the region of 250–400 nm, whereas no CD signal changes were found with cysteine alone. We also investigate their nonlinear optical properties after two-photon absorption. Two-photon emission spectra and first hyperpolarizabilities, as obtained by the hyper-Rayleigh scattering technique, of these particles are presented.

关键词： Gold Cysteine Supramolecular chemistry Nanoparticles Chirality Nonlinear optics

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Telomeres,telomerase and colorectal cancer

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World Journal of Gastroenterology 2014年第8期20卷 1940-1950页

作者： Roberta bertorelle Enrica Rampazzo Salvatore Pucciarelli Donato Nitti Anita De Rossi Department of Surgery Oncology and GastroenterologySection of Oncology and ImmunologyUniversity of PadovaIOV-IRCCS35128 PadovaItaly Department of Surgery Oncology and GastroenterologySection of SurgeryUniversity of Padova35128 PadovaItaly

Colorectal cancer(CRC)is the third most common cancer worldwide and,despite improved treatments,is still an important cause of cancer-related *** encompasses a complex of diseases arising from a multistep process of genetic and epigenetic *** heterogeneity in the molecular and biological features of CRC,chromosomal instability is a hallmark of cancer and cancer cells may also circumvent replicative senescence and acquire the ability to sustain unlimited ***/telomerase interplay is an important mechanism involved in both genomic stability and cellular replicative potential,and its dysfunction plays a key role in the oncogenetic *** erosion of telomeres,mainly because of cell proliferation,may be accelerated by specific alterations in the genes involved in CRC,such as APC and *** there is general agreement that the shortening of telomeres plays a role in the early steps of CRC carcinogenesis by promoting chromosomal instability,the prognostic role of telomere length in CRC is still under *** activation of telomerase reverse transcriptase(TERT),the catalytic component of the telomerase complex,allows cancer cells to grow indefinitely by maintaining the length of the telomeres,thus favouring tumour formation/*** studies indicate that TERT increases with disease progression,and most studies suggest that telomerase is a useful prognostic *** TERT mRNA may also be a promising marker for the minimally invasive monitoring of disease progression and response to therapy.

关键词： Telomere Telomerase Telomerase reverse transcriptase Colorectal cancer Prognostic marker

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