RESUMEN
Perovskite-based SrSnO3 nanostructures doped with indium are prepared via a facile chemical precipitation method. Prepared nanostructures are used to assemble the dye-sensitized solar cells (DSSCs), and their photovoltaic response and electrochemical impedance spectra are measured. The synthesized samples are subjected to structural, morphological, optical, and magnetic properties. The X-ray diffraction pattern confirms the single-phase orthorhombic (Pbnm) perovskite structure. Local structural and phonon mode variations are examined by Raman spectra. Electron micrographs disclose the nanorods. The elements (Sr, Sn, O, and In) and the existence of oxygen vacancies are identified by X-ray photoelectron spectroscopy analysis. Surface area analysis demonstrates the higher surface area (11.8 m2/g) for SrSnO3 nanostructures. Optical absorption spectra confirm the good optical behavior in the ultraviolet region. The multicolor emission affirms the presence of defects/vacancies present in the synthesized samples. The appearance of interesting ferromagnetic behavior in the prepared samples is due to the presence of F-center exchange interactions. Under the irradiation (1000 W/m2) of simulated sunlight, the DSSC fabricated by 3% In-doped SrSnO3 exhibits the highest η of 5.68%. Hence, the blocking layers prepared with pure and indium-doped samples could be the potential candidates for DSSC applications.
RESUMEN
Carcinoma cervix is one of the most common malignancies seen in women worldwide and more so in the Indian subcontinent. Carcinoma cervix is known for its orderly lymphatic spread. Skip metastasis or intraluminal metastasis is not a frequent occurrence. A 50-year-old diabetic and hypertensive female patient who was diagnosed to have carcinoma cervix (stage II A 2) Grade II to III and post radiotherapy (3 years back) presented to the surgical outpatient with dyspeptic symptoms and vague abdominal pain. On examination she was found to have a 1x1cm hard, fixed, left supraclavicular node and a palpable liver. Ultrasound abdomen revealed multiple retro peritoneal lymphadenopathy and Contrast Enhanced Computerised Tomography (CECT) abdomen revealed secondary deposits in the pancreatico-duodenal groove infiltrating the duodenal C-loop and pancreatic head, with multiple retroperitoneal nodes with necrosis. Fine needle Aspiration Cytology (FNAC) from left supraclavicular node revealed metastatic squamous cell carcinoma. Oesophagogastroduodenoscopy showed 2 sessile lesions in the anterior wall of duodenum with mucosa stretched and central umbilication with almost complete luminal obstruction. Biopsy from the duodenal lesion also turned out positive for metastatic squamous cell carcinoma. Gynaecological examination was negative for any local recurrence. Patient was managed symptomatically for dyspepsia and is currently undergoing chemotherapy. She is at present on regular follow-up and is asymptomatic for the bowel metastasis. Given the frequency of cancer cervix and the rarity of intra luminal metastasis, this case report serves to reiterate the fact that the abdomen is truly a pandora's box.