De los rizomas de Cyperus articulatus (piri-piri de víbora) sometidos a extracción con éter de petróleo (30 – 60 BP) se ha obtenido aceite esencial (concreta) que fue analizado en un cromatógrafo de gases de alta resolución acoplado a un espectrómetro de masas (HRGC-MS) y se encontró 77 componentes de los cuales 62 son sesquiterpenoides (80.52%) y 15 monoterpenoides (19.48%) Sin dejar de citar tres esqueletos irregulares el C13H20O (0.87%), el C14H26O2 (0.877%) y el C14H22O (1.05%), respectivamente; que están más cercanos a los sesquiterpenos que a los monoterpenos. El componente más abundante es un sesquiterpenoide cuya fórmula es C15H22O2; se encuentra en un 2.0%; también están presentes otros dos sesquiterpenoides significativos: culmorina, que representa el 1.89%, y corimbolona, el 1.88%. Los monoterpenos más abundantes son: Un componente desconocido de fórmula C10H...

The present study aimed to analyze the relationship between donor characteristics and deferral causes in blood donation at the Regional Blood Center of Loreto during 2024. An observational, descriptive, cross-sectional, and retrospective study was conducted based on the analysis of 10,542 donor candidate records. Of the donors, 62.1% were men, and the most frequent age group was 18 to 30 years (53.8%). A total of 3,602 deferrals were recorded (34.2%), with the main causes being hematological conditions (39.0%), reactive screening tests (15.8%), and medication use (7.1%). Hepatitis B was the most frequent infectious marker among positive screenings (57.0%), followed by syphilis (19.2%). Deferral was significantly associated with age, sex, marital status, place of residence, and blood group. Individuals over 50 years had a higher risk of deferral (OR: 1.7; 95% CI: 1.5–2.0). Women showed ...