Constraining the degassing processes of Popocatépetl Volcano, Mexico: A vesicle size distribution and glass geochemistry study

2012 ◽  
Vol 225-226 ◽  
pp. 81-95 ◽  
Author(s):  
J.K. Cross ◽  
J. Roberge ◽  
D.A. Jerram
Keyword(s):  
Size Distribution ◽  
Vesicle Size ◽  
Popocatépetl Volcano ◽  
Vesicle Size Distribution ◽  
Popocatepetl Volcano

scholarly journals Enthalpic incompatibility between two steric stabilizer blocks provides control over the vesicle size distribution during polymerization-induced self-assembly in aqueous media

2020 ◽  
Vol 11 (39) ◽  
pp. 10821-10834
Author(s):  
Deborah L. Beattie ◽  
Oleksandr O. Mykhaylyk ◽  
Steven P. Armes
Keyword(s):  
Binary Mixture ◽  
Size Distribution ◽  
Self Assembly ◽  
Aqueous Media ◽  
Vesicle Size ◽  
Vesicle Size Distribution

SAXS studies confirm that a judicious binary mixture of enthalpically incompatible steric stabilizer blocks enables the synthesis of relatively small, well-defined vesicles via polymerization-induced self-assembly in aqueous media.

scholarly journals Enlarged extracellular vesicles are a negative prognostic factor in patients undergoing TACE for primary or secondary liver cancer–a case series

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0255983
Author(s):  
David Schöler ◽  
Mirco Castoldi ◽  
Markus S. Jördens ◽  
Max Schulze-Hagen ◽  
Christiane Kuhl ◽  
...  
Keyword(s):  
Overall Survival ◽  
Liver Cancer ◽  
Size Distribution ◽  
Prognostic Marker ◽  
Extracellular Vesicles ◽  
Cox Regression Analysis ◽  
Vesicle Size ◽  
Potential Biomarker ◽  
Vesicle Size Distribution ◽  
Hepatic Malignancies

Background Transarterial chemoembolization (TACE) has evolved as a standard treatment option in patients with intermediate stage, unresectable HCC [Barcelona Clinic Liver Cancer (BCLC) stage B] as well as in patients with liver metastases, when surgery or systemic therapy is considered not appropriate. Concentration and sizes of extracellular vesicles (EVs) recently emerged as novel diagnostic and prognostic biomarkers in patients with liver cancer, but no data on its prognostic relevance in the context of TACE exists. Here, we evaluate pre-interventional EVs as a potential biomarker in patients undergoing TACE for primary and secondary hepatic malignancies. Methods Vesicle size distribution and concentration were measured by nanoparticle tracking analysis (NTA) in patient sera before and after TACE in 38 patients. Results Extracellular vesicle size distribution measured before TACE is of prognostic significance with respect to overall survival in patients after TACE. Overall survival is significantly reduced when initial vesicle size (X50) is in the upper quartile (>145.65nm). Median overall survival in patients in the upper quartile was only 314 days, compared to 799 days in patients with vesicle size in the first to third quartile (<145.65nm; p = 0.007). Vesicle size was also shown to be a significant prognostic marker for overall survival in Cox regression analysis [HR 1.089, 95% CI: 1.021–1.162, p = 0.010]. In addition, a significant correlation was observed between initial EVs concentration/BMI (rS = 0.358, p = 0.029), X50/IL-8-concentration (rS = 0.409, p = 0.011) and X50/CRP-concentration (rS = 0.404, p = 0.016). In contrast, with regard to immediate tumor response after TACE, EVs concentration and size did not differ. Summary Sizes (but not concentrations) of EVs represent a novel prognostic marker in patients receiving TACE for primary and secondary hepatic malignancies since patients with enlarged EVs display a significantly impaired prognosis after TACE.

scholarly journals Vesicle Size Distribution as a Novel Nuclear Forensics Tool

PLoS ONE ◽  
2016 ◽  
Vol 11 (9) ◽  
pp. e0163516
Author(s):  
Patrick H. Donohue ◽  
Antonio Simonetti
Keyword(s):  
Size Distribution ◽  
Nuclear Forensics ◽  
Vesicle Size ◽  
Vesicle Size Distribution

Influence of vesicle size distribution on level and selectivity of accumulation of liposomal photosensitizer Tiosens in tumor

2007 ◽  
Author(s):  
Gennady A. Meerovich ◽  
Igor G. Meerovich ◽  
Daria G. Gurevich ◽  
Sergey I. Vorobyov ◽  
Vyacheslav G. Pevgov ◽  
...  
Keyword(s):  
Size Distribution ◽  
Vesicle Size ◽  
Vesicle Size Distribution

Thermal fluctuations of vesicles and nonlinear curvature elasticity—implications for size-dependent renormalized bending rigidity and vesicle size distribution

Soft Matter ◽  
2016 ◽  
Vol 12 (9) ◽  
pp. 2523-2536 ◽  
Author(s):  
Fatemeh Ahmadpoor ◽  
Pradeep Sharma
Keyword(s):  
Size Distribution ◽  
Biological Membranes ◽  
Thermal Fluctuations ◽  
Bending Rigidity ◽  
Vesicle Size ◽  
Size Dependent ◽  
Curvature Elasticity ◽  
Vesicle Size Distribution

Both closed and open biological membranes noticeably undulate at physiological temperatures.

Spatial and temporal b-value characterization at Popocatépetl volcano, Central Mexico

2021 ◽  
pp. 107320
Author(s):  
Quetzalcoatl Rodríguez-Pérez ◽  
Marisol Monterrubio-Velasco ◽  
F. Ramón Zúñiga ◽  
Carlos M. Valdés-González ◽  
Raúl Arámbula-Mendoza
Keyword(s):  
B Value ◽  
Central Mexico ◽  
Popocatépetl Volcano ◽  
Popocatepetl Volcano

ANALYSIS OF AIRBORNE PARTICULATE MATTER COLLECTED AFTER AN ERUPTION EPISODE OF THE POPOCATÉPETL VOLCANO

2003 ◽  
Vol 13 (03n04) ◽  
pp. 133-139 ◽  
Author(s):  
F. ALDAPE ◽  
J. FLORES M.
Keyword(s):  
Particle Size ◽  
Particulate Matter ◽  
Mexico City ◽  
Airborne Particulate Matter ◽  
Airborne Particulate ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Two Samples ◽  
Popocatépetl Volcano ◽  
Popocatepetl Volcano

Samples of airborne particulate matter were collected in four sites along an east-west line from the Popocatépetl volcano after the eruption episode of June 30, 1997. The Popocatépetl volcano, with variable activity since it was known, is currently under low but continuous activity prolonged for almost one decade, with occasional moderate eruption episodes producing mainly fumes, ashes and volcanic dusts. The main objective of this study is to determine whether or not some elements have increased their presence in the atmosphere as a result of the volcanic activity, and also if some others, not usually found in urban aerosols, have appeared because of the same reason. In addition, the information obtained will be a source of scientific data for health risk assessment of the population exposed to volcanic emanations. The sample collection was performed on alternate days from July 10 to August 13 1997 in Puebla and Atlixco in Puebla State. Tlalpan within Mexico City, and Salazar in the State of Mexico. Two samples a day were taken in two periods: 7-19 h and 19-7 h. The samplers separated particles into two particle size fractions. PM25 and PM15. Elemental concentrations were determined by PIXE and the results obtained showed increased concentrations of mainly Ti and Fe in all sampling sites, thus indicating a long range transportation of volcanic dusts in both particle size fractions. Concentrations of Ti were found clearly above the average values of urban areas such as Mexico City, and although this element can be considered of low toxicity, the biological, metabolic and toxic effects on human beings are still under investigation.

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