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김민준,( Srikanth Turlapati ),( Somen Debnath ),( Nandiraju V. S. Rao ),윤동기 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
To generate large optical texture, we have utilized chemically modifying substrates using self-assembled monolayers (SAM) having molecule-phobic characteristic. A droplet on the substrate treated by SAM exhibited large focal conic domains. And an in-plane electric field spread out droplet that finally changed to uniform thin film. The liquid crystalline molecules in the film exhibited uniaxial orientation in the same direction of the electric field, resulting in linearly polarized light emission due to fluorescence of the molecules. The highly aligned B7 film with large area was characterized by depolarized transmitted light microscopy (DTLM) and fluorescence polarizing microscopy (FPM). And the B7 film will provide great opto-electronic applications such as a linearly polarized light emission film and a fast light modulator.
Highly Polarized Fluorescent Illumination Using Liquid Crystal Phase
Gim, Min-Jun,Turlapati, Srikanth,Debnath, Somen,Rao, Nandiraju V. S.,Yoon, Dong Ki American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.5
<P>Liquid crystal (LC) materials are currently the dominant electronic materials in display technology because of the ease of control of molecular orientation using an electric field. However, this technology requires the fabrication of two-polarizers to create operational displays, reducing light transmission efficiency below 10%. It is therefore desirable to develop new technologies to enhance the light efficiency while maintaining or improving other properties such as the modulation speed of the molecular orientation, Here we report a uniaxial-oriented B7 smectic liquid crystalline film, using fluorescent bent-core LC molecules, a chemically modified substrate, and an in-plane electric field. A LC droplet under homeotropic boundary conditions of air/LC as well as LC/substrate exhibits large focal conic like optical textures. The in-plane electric field induced uniaxial orientation of the LC molecules) in which molecular polar directors are aligned in the direction of the electric field. This highly oriented LC film exhibits linearly polarized luminescence and microsecond time-scale modulation characteristics. The resultant device is both cheap and easy to.fabricate and thus has great potential for electro-optic applications, including LC displays, bioimaging systems, and optical communications.</P>
Ghosh, Saptarshi,Sarkar, Shreyasee,Simhareddy, Samara,Kotne, Sivasankar,Rao, Pammidimukkala Bramh Ananda,Turlapati, Satya Prakash Venkatachalam Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Background: Breast cancer is the most common malignancy in women worldwide and the second most common cancer in females in India. Receptor status may be important for survival. Objective: To analyse and correlate the clinical and morphological parameters with receptor status in breast carcinoma patients in a tertiary care institution in Southern India. Materials and Methods: This retrospective study involved 320 patients of breast cancer diagnosed in an oncology hospital over a period of $3^{1/2}$ years. Data was analysed using SPSS Version 21. Results: Some 60.6% patients with breast carcinomas belonged to the age group of 40 to 60 years. The most common histological type was infiltrating ductal carcinoma, not otherwise specified, accounting for 84.4% of patients. On immunohistochemistry, estrogen receptor (ER) and progesterone receptor (PR) were expressed in 56.3% and 53.1% of cases, respectively. Conclusions: Breast cancers in India, a developing country, occur in younger women and tend to be more aggressive with lower rates of ER and PR expression and higher histological tumor grades. Both ER and PR status of the tumors had significant associations with the patient age, pathological TNM stage and histological tumor grade.