Arturo Pedro Sierra-Beltrán

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Toxicities and tetrodotoxin distribution in tissues of five puffer fish species commonly found in the littoral of Baja California Peninsula, Mexico (Sphoeroides annulatus, S. lobatus, S. lispus,(More)
Black turtle plasmatic vitellogenin (VTG) was purified from 17beta-estradiol-induced males using ion-exchange chromatography. The isolated protein was identified as VTG by its glycolipoprotein nature(More)
The taxonomic assignment of Prorocentrum species is based on morphological characteristics; however, morphological variability has been found for several taxa isolated from different geographical(More)
The presence of Helicobacter pylori in the gastroduodenal mucosae is associated with chronic active gastritis, peptic ulcers and gastric cancers such as adenocarcinoma and low-grade gastric B-cell(More)
Helicobacter pylori have colonized the gastric mucosa of half of the population worldwide. This bacterium is classified as a definitive type I carcinogen by the World Health Organization and no(More)