RESUMEN
Venus, lacking an intrinsic global dipole magnetic field, serves as a textbook example of an induced magnetosphere, formed by interplanetary magnetic fields (IMF) enveloping the planet. Yet, various aspects of its magnetospheric dynamics and planetary ion outflows are complex and not well understood. Here we analyze plasma and magnetic field data acquired during the fourth Venus flyby of the Parker Solar Probe (PSP) mission and show evidence for closed topology in the nightside and downstream portion of the Venus magnetosphere (i.e., the magnetotail). The formation of the closed topology involves magnetic reconnection-a process rarely observed at non-magnetized planets. In addition, our study provides an evidence linking the cold Venusian ion flow in the magnetotail directly to magnetic connectivity to the ionosphere, akin to observations at Mars. These findings not only help the understanding of the complex ion flow patterns at Venus but also suggest that magnetic topology is one piece of key information for resolving ion escape mechanisms and thus the atmospheric evolution across various planetary environments and exoplanets.
RESUMEN
BACKGROUND: There is increasing evidence that HER2-neu is an important biomarker in gastric carcinomas (GC) and gastroesophageal junction (GEJ) adenocarcinomas. The aim of this study was to evaluate HER2-neu expression and also some clinicopathological features of these neoplasms. MATERIALS AND METHODS: We selected 211 paraffin-embedded blocks, 193 GC and 18 GEJ. Then 4 micron sections were prepared for staining with hematoxylin and eosin and also for IHC (Her2-neu). The Chi-square test was used for significance between expression of HER2-neu and clinicopathological parameters. RESULTS: In patients with advanced cancer of GC and GEJ, HER2-neu overexpression was more associated with the intestinal cancer subtype. CONCLUSIONS: This could be a guide to new complementary therapy for affected patients.
Asunto(s)
Adenocarcinoma/patología , Neoplasias Esofágicas/patología , Unión Esofagogástrica/patología , Amplificación de Genes/genética , Neoplasias Intestinales/patología , Receptor ErbB-2/biosíntesis , Neoplasias Gástricas/patología , Adenocarcinoma/terapia , Adulto , Anciano , Anciano de 80 o más Años , Biomarcadores de Tumor/biosíntesis , Neoplasias Esofágicas/terapia , Femenino , Regulación Neoplásica de la Expresión Génica , Humanos , Masculino , Persona de Mediana Edad , Receptor ErbB-2/genética , Neoplasias Gástricas/terapiaRESUMEN
The aim of the present study was to determine the effect of cigarette smoke on the growth of Streptococcus mutans and Streptococcus sanguis. The standard strains of S. mutans (ATCC 25175) and S. sanguis (ATCC 10556) were cultured on blood agar and incubated for 48 hr in three main environments: atmospheric air, carbon dioxide, and cigarette smoke. Kent gold 1(nicotine: 0.1 mg, tar: 1 mg), Kent lights (nicotine: 0.8 mg, tar: 9 mg) and Bahman (nicotine: 1 mg, tar: 13 mg) were the brands used in the present study. Afterwards, digital photographs of the colonies were taken and the diameter of colonies was measured. Data were analyzed using Post Hoc and General Linear Model statistical tests. Cigarette smoke and carbon dioxide environments significantly increased the growth of S. mutans. However, high nicotine/tar content cigarette smoke (Bahman) had the greatest impact on S. mutans and S. sanguis. The mutans/sanguis ratio, which was 0.71 in atmospheric air, increased to 1.07 in the presence of carbon dioxide. Kent gold 1, Kent lights, and Bahman demonstrated a mutans/sanguis ratio of 1, 0.84, and 0.98 respectively. In conclusion, it seems that the growth of S. sanguis and S. mutans is accelerated in the vicinity of cigarette smoke.