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Precursor synthesis and microwave processing of nickel ferrite nanoparticles
V.K.Sankaranarayanan,C.Sreekumar 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Nickel based ferrites have several applications in microwave components as dense polycrystalline compacts. In this study we haveprepared nickel ferrite nanoparticles by a self-ignition reaction directly from a citrate precursor. XRD patterns and FTIR spectraconrm the formation of single phase nickel ferrite. The sample couples readily with microwaves at ambient temperatures and theresidual carbon present in the self-ignited sample could be removed in a few minutes by microwave treatment. The samples,takes place.. 2002 Elsevier Science B.V. All rights reserved.
Kumar, V.,Sankaranarayanan, M.,Durgapal, M.,Zhou, S.,Ko, Y.,Ashok, S.,Sarkar, R.,Park, S. Elsevier Applied Science 2013 Bioresource technology Vol.135 No.-
In the present study, the lactate dehydrogenase-deficient (ldhA<SUP>-</SUP>) recombinant Klebsiella pneumoniae overexpressing an ALDH (KGSADH) was developed and the co-production of 3-HP and PDO from glycerol by this recombinant under resting cell conditions was examined. The new recombinant did not produce any appreciable lactate, which seriously inhibits the production of 3-HP and PDO. The final titers of 3-HP and PDO by the ldhA<SUP>-</SUP> recombinant strain at 60h were 252.2mM and 308.7mM, respectively, which were improved by approximately 30% and 50%, respectively, compared to those by the counterpart recombinant strain, which was the wild type for ldhA. In addition, after deleting ldhA, the cumulative yield on glycerol and specific production rate of these two metabolites (3-HP and PDO) were enhanced by 41.4% and 52%, respectively.
Govindan, V.,Joseph Daniel, D.,Kim, H.J.,Sankaranarayanan, K. Elsevier 2019 Dyes and pigments Vol.160 No.-
<P><B>Abstract</B></P> <P>Temperature gradient based unidirectional solution growth set-up was specially designed to felicitate the growth of unidirectional crystals of t-stilbene with cylindrical dimension of 6 cm × 2 cm without the need of post growth machining process for scintillator application. A growth rate of 1 mm/day was achieved along <011> direction. The PXRD establishes the phase purity of the grown material. FT-IR and Micro-Raman spectrometers were utilized to justify the presence of the functional groups of the t-stilbene and anisole (solvent). The recorded narrow aromatic vibrations in FT-IR and Raman ascertain the undetectable limit of solvent inclusion in the grown crystal. Absence of new vibrations other than the expected supports the chemical purity of the crystal. The transparency in visible range establishes the suitability of the material for scintillator application where its characteristic emission wavelength under high energy radiation lies. The thermal stability up to 120 °C without any structural/phase change was evident from TG/DTA. The radioluminescence spectra were carried out under β and γ and found the grown crystal exhibits emissions at 384 and 405 nm which is very similar to the studied photoluminescence characteristics. The scintillation characteristics of the t-stilbene investigated using γ –rays from various radioactive sources such as <SUP>137</SUP>Cs, <SUP>133</SUP>Ba and, <SUP>109</SUP>Cd. The scintillation decay time of the grown crystal also studied using the same <SUP>133</SUP>Cs source and fitted with single exponential component of 12 ns.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Organic scintillator t-stilbene single crystal has been grown by SR method. </LI> <LI> A growth rate of 1 mm/day was achieved along <011> direction. </LI> <LI> RL spectra exhibit emissions at 384 and 405 nm under β and γ excitation. </LI> <LI> Scintillation properties were studied using γ –rays of various radioactive sources. </LI> </UL> </P>
Thulaseedharan, Jissa V.,Malila, Nea,Hakama, Matti,Esmy, Pulikottil O.,Cheriyan, Mary,Swaminathan, Rajaraman,Muwonge, Richard,Sankaranarayanan, Rengaswami Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6
Background: India shows some of the highest rates of cervical cancer worldwide, and more than 70% of the population is living in rural villages. Prospective cohort studies to determine the risk factors for cervical cancer are very rare from low and medium resource countries. The aim of this study was to quantify the effect of risk factors related to cervical cancer in a rural setting in South India. Material and methods: Sociodemographic and reproductive potential risk factors for cervical cancer were studied using the data from a cohort of 30,958 women who constituted the unscreened control group in a randomised screening trial in Dindigul district, Tamilnadu, India. The analysis was accomplished with the Cox proportional hazard regression model. Results: Women of increasing age (HR=2.4; 95% CI: 1.6, 3.8 in 50-59 vs 30-39), having many pregnancies (HR=7.1; 1.0, 52 in 4+ vs 0) and no education (HR=0.6; 0.2, 0.7 in high vs none) were found to be at significantly increased risk of cervical cancer. Conclusion: This cohort study gives very strong evidence to say that education is the fundamental factor among the sociodemographic and reproductive determinants of cervical cancer in low resource settings. Public awareness through education and improvements in living standards can play an important role in reducing the high incidence of cervical cancer in India. These findings further stress the importance of formulating public health policies aimed at increasing awareness and implementation of cervical cancer screening programmes.
Improved Survival of Cervical Cancer Patients in a Screened Population in Rural India
Jayant, Kasturi,Sankaranarayanan, Rengaswamy,Thorat, Ranjit V,Muwonge, Richard,Hingmire, Sanjay J,Panse, Nandkumar S,Shastri, Surendra S,Malvi, Sylla G,Nene, Bhagwan Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.11
Objectives: To describe the survival experience of cervix cancer patients in a screened rural population in India. Methods: Included 558 cervical cancer patients diagnosed in 2000-2013 in a cohort of 100,258 women invited for screening during 2000-2003. The primary end point was death from cervical cancer. We used the Kaplan-Meier method to estimate cumulative observed survival and Cox proportional hazards regression to assess the effect of patient characteristics on survival after diagnosis. Results: Of the 558 cases included, 143 (26%) and 114 (20%) were diagnosed in stages IA and IB respectively; 252 (45.2%) were dead, and 306 (54.8%) were alive at the last follow-up. The overall 5-year observed survival was 60.5%. The 5-year survival of stage IA patients was 95.1% and 5.3% for stage IV patients. All surgically treated stage IA patients, 94.1% of stage IB patients receiving intracavitary radiotherapy, 62% of stage IIB, 49% of stage III and 25% of stage IV patients receiving radiotherapy survived for 5 years. Conclusion: Higher 5-year survival in our study than elsewhere in India is due to the high proportion of early stage cancers detected by screening combined with adequate treatment, resulting into a favourable prognosis.