Publications by authors named "Sankar Narayanan"

In India, cervical cancer is the second leading cause of cancer-related mortality among females. Around one-third are expected to develop recurrence or metastasis during follow-up. Liver metastasis is rarely requiring palliative treatment.

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Radical surgery remains the primary treatment option for gall bladder cancer (GBC). Margin-negative liver resection is a critical component of radical cholecystectomy. Anatomical segment IVb and V resection is preferred in primary GBC with liver infiltration and incidental GBC patients with puckering of gall bladder (GB) bed.

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Pancreatic ductal adenocarcinoma is an aggressive tumor with poor long-term outcomes. Chronic pancreatitis (CP) is considered a risk factor for the development of pancreatic cancer (PC). Persistent pancreatic inflammation and activation of pancreatic stellate cells play a crucial role in the pathogenesis of CP-related PC by activating the oncogene pathway.

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Chronic pancreatitis (CP) is a sequelae characterized by recurrent attacks of pancreatitis leading on to fibrosis and calcification of both ductal and parenchymal elements of the pancreas. Most of these, if left untreated at the right time, will lead on to burnt-out pancreas with complete atrophy of the parenchyma, leading on to endocrine/exocrine insufficiency. The pain in such patients is most likely due to ductal hypertension, parenchymal hypertension, and head mass causing perineural inflammation.

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Oral cancer is the fifth most common cancer in the world, accounting for numerous deaths annually. The 5-year survival rate remains approximately 50% for oral squamous cell carcinoma (OSCC) in the past several decades. Early detection plays a vital role in the survival rate of the patients.

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The styloid process (SP) on the temporal bone is a highly variable formation. The normal length of the SP ranges from 20 to 30 mm. In spite of its being normally distributed in the population, SPs could be divided into two groups - short SPs with >20 mm and long SPs with <20 mm in length.

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Metallic nanowires usually exhibit ultrahigh strength but low tensile ductility owing to their limited strain hardening capability. Here we study the unique strain hardening behavior of the five-fold twinned Ag nanowires by nanomechanical testing and atomistic modeling. In situ tensile tests within a scanning electron microscope revealed strong strain hardening behavior of the five-fold twinned Ag nanowires.

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Stacking fault tetrahedra, the three-dimensional crystalline defects bounded by stacking faults and stair-rod dislocations, are often observed in quenched or irradiated face-centred cubic metals and alloys. All of the stacking fault tetrahedra experimentally observed to date are believed to originate from vacancies. Here we report, in contrast to the classical vacancy-originated ones, a new kind of stacking fault tetrahedra formed via the interaction and cross-slip of partial dislocations in gold nanocrystals.

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