Search results for " (ROS)"

Sex- and age-related variation in survival and cost of first reproduction in Greater Flamingos

2001

International audience; We analyzed survival of breeding Greater Flamingos, Phoenicopterus ruber roseus, using the capture histories of 2000 breeding birds ringed as chicks and resighted at their natal colony in the Camargue, southern France. As found in previous analyses, recapture probability varied according to year, sex, and age of the bird, and annual survival was strongly affected by winter severity. However, by using a much larger data set than in earlier analyses, we detected previously nonsignificant effects. Indeed, for the first time, sex and age of the bird were found to influence annual survival probability. We tested the hypothesis that the observed sex-related difference in s…

Reactive oxygen species release, vitamin E, fatty acid and phytosterol contents of artificially aged radish (Raphanus sativus L.) seeds during germin…

2012

Abstract Seeds of Raphanus sativus L. subjected to accelerated ageing were investigated for reactive oxygen species (ROS) release and for content of vitamin E (tocopherol, TOC, and tocotrienol, TOC-3), fatty acids and phytosterols in seed coats, cotyledons and embryonic axes during germination. In unaged seeds, ROS release occurred mainly in seed coats of non-imbibed seeds and in seedlings (48 h of imbibition). TOC and TOC-3 were mainly represented by the c-isoform, abundant in embryonic axes. Fatty acids were mainly found in cotyledons. In seed coat and embryonic axis, phytosterols consisted mainly of sitosterols. The effects of ageing were mainly visible in embryonic axes at 48 h of imbib…

Flowers, Water accumulation and Corporate Social Responsibility: Certification of the Production of Roses and Claims for Environmental Justice in Ecu…

2018

La producción comercial de flores, el acaparamiento del agua y las luchas sociales por un reparto equitativo y un ambiente sano tienen una estrecha relación. Ecuador es el tercer exportador mundial de rosas. Cayambe-Tabacundo es la principal zona de producción y presenta una fuerte presión sobre los recursos hídricos. El agua es acaparada por las grandes empresas florícolas, quedando el resto para agricultura/ganadería de subsistencia en comunidades indígenas. Las florícolas utilizan las certificaciones ambientales y de comercio justo privadas, pero los estándares son permisivos. Este artículo analiza las relaciones de poder detrás de las prácticas de certificación de flores. Concluye que s…

4 – 5 gadīgu bērnu intereses par dabu rosināšana rotaļās dabā

2022

Kvalifikācijas darba tēma ir „4 – 5 gadīgu bērnu intereses par dabu rosināšana rotaļās dabā”. Problēmas aktualitāte: Šī brīža paaudzei ir nepieciešams rast mērenību starp laiku, kas tike pavadīt pie ekrāna un rotaļām dabā. Mijiedarbība ar dabisku vidi ļauj bērniem gūt zināšanas darot un eksperimentējot ar idejām – domāt, apšaubīt un izvirzīt hipotēzes, iejūtoties zinātnieku lomā. Šī bērnu paaudze nekad nav pazinusi dzīvi bez datora vai interneta. Pētījuma mērķis: pētīt un izzināt 4 – 5 gadīgu bērnu intereses pret rotaļām dabā veidošanos. Darba pirmajā nodaļā atspoguļotas intereses būtība dažādu autoru skatījumā, veikts pētāmā vidējā pirmsskolas vecuma bērnu raksturojums, apkopotas dažādu au…

Study of quantitative and qualitative variations in essential oils of Sicilian Rosmarinus officials L.

2015

In this study the chemical characterizations of 10 sicilian biotypes of Rosmarinus officinalis L. essential oils are reported. The main goal was to analyze the relationship between the essential oils yield and the geographical distribution of the species plants. The essential oils were analyzed by GC-FID and GC-MS. The statistical methods Hierarchical Cluster Analysis and Principal Component Analysis were used to cluster biotypes according to the chemical composition of the essential oils. The essential oil yield ranged from 0.8 - 2.3 (v/w). 82 compounds have been identified, these represent 96.7-99.9% of the essential oil. The compounds mostly represented in the essential oils were: 1.8- C…

Ernesto Rossi e La Riforma Sociale (1926-1930). La carriera interrotta di un economista politico

2022

Con questo saggio si intende ricostruire la breve ma intensa fase di collaborazione di Ernesto Rossi con La Riforma Sociale, prestigiosa rivista di economia e scienze sociali fondata da Francesco Saverio Nitti nel 1894 e diretta da Luigi Einaudi dal 1908. Fra il 1926 e il 1930 Rossi è autore di sette lunghi saggi su tematiche di finanza pubblica, economia applicata e statistica economica che sono stati relativamente trascurati dalla storiografia. La rilettura di questi contributi consente di approfondire alcuni momenti centrali nella sua formazione di economista. In particolare: l’influenza di Einaudi e di De Viti de Marco; la predilezione per un approccio empirico all’analisi economica; la…

EFFECT OF EXTRACTS FROM LEAVES AND RHIZOMES OF THE SEAGRASS POSIDONIA OCEANICA ON HEPG2 HEPATOCARCINOMA (HCC) CELLS

2022

Parthenolide induces caspase-independent and AIF-mediated cell death in human osteosarcoma and melanoma cells

2013

The mechanism of the cytotoxic effect exerted by parthenolide on tumor cells is not clearly defined today. This article shows that parthenolide stimulates in human osteosarcoma MG63 and melanoma SK-MEL-28 cells a mechanism of cell death, which is not prevented by z-VAD-fmk and other caspase inhibitors. In particular treatment with parthenolide rapidly stimulated (1-2 h) reactive oxygen species (ROS) generation by inducing activation of extracellular signal-regulated kinase 1/2 (ERK 1/2) and NADPH oxidase. This event caused depletion of thiol groups and glutathione, NF-κB inhibition, c-Jun N-terminal kinase (JNK) activation, cell detachment from the matrix, and cellular shrinkage. The increa…

Zinc accelerates respiratory burst termination in human PMN

2021

The respiratory burst of phagocytes is essential for human survival. Innate immune defence against pathogens relies strongly on reactive oxygen species (ROS) production by the NADPH oxidase (NOX2). ROS kill pathogens while the translocation of electrons across the plasma membrane via NOX2 depolarizes the cell. Simultaneously, protons are released into the cytosol. Here, we compare freshly isolated human polymorphonuclear leukocytes (PMN) to the granulocytes-like cell line PLB 985. We are recording ROS production while inhibiting the charge compensating and pH regulating voltage-gated proton channel (HV1). The data suggests that human PMN and the PLB 985 generate ROS via a general mechanism,…

A Genomic, Transcriptomic and Proteomic Look at the GE2270 Producer Planobispora rosea, an Uncommon Actinomycete.

2015

We report the genome sequence of Planobispora rosea ATCC 53733, a mycelium-forming soil-dweller belonging to one of the lesser studied genera of Actinobacteria and producing the thiopeptide GE2270. The P. rosea genome presents considerable convergence in gene organization and function with other members in the family Streptosporangiaceae, with a significant number (44%) of shared orthologs. Patterns of gene expression in P. rosea cultures during exponential and stationary phase have been analyzed using whole transcriptome shotgun sequencing and by proteome analysis. Among the differentially abundant proteins, those involved in protein metabolism are particularly represented, including the G…