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Corrosion Behaviour of Aluminium Engine Block in 3.5% NaCl Solution  [PDF]
M. S. Kaiser, Swagata Dutta
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.210008

In the present work, the corrosion behavior of aluminium alloy engine block in 3.5% NaCl solution was studied. The work was carried out using conventional gravimetric measurements and complemented by scanning electron microscopy (SEM) and X-ray analyzer (EDX) investigations. The results obtained indicate that the main process the alloy undergoes, under the medium of exposure studied, is related to localized corrosion that takes place as a consequence of the process of alkalinization around the cathodic precipitates existing in the alloy. The alloy suffers a process of corrosion localized to the area surrounding the precipitates of the Al (Si, Mg) and Al-Mg, which resulted in hemispherical pits. This identification was confirmed by SEM and EDX analysis. No evidence was found of the formation of crystallographic pitting for exposure times up to 54 days. Gravimetric analysis confirmed that with varying exposure periods the weight loss of the alloy increases and the corrosion rate decreases with time.

Chromosomal abnormalities associated with mental retardation in female subjects
Dutta Samikshan,Shaw Jyoti,Sinha Swagata,Mukhopadhyay Kanchan
Indian Journal of Human Genetics , 2009,
Abstract: Chromosomal abnormalities are thought to be the most common cause of mental retardation (MR). However, apart from a few selected types with typical aneuploidy, like Downs syndrome, Klinefelter syndrome, Turner syndrome, etc., the frequency of detectable chromosomal abnormalities in association with idiopathic MR is very low. In this study, we have investigated chromosomal abnormalities in female MR subjects (n = 150) by high-resolution GTG banding. Of them, 30 cases were diagnosed as Downs syndrome. Among the remaining (n = 120), chromosomal abnormalities/marked polymorphisms were detectable in only three MR cases (0.025).
Cystathionine β-synthase T833C/844INS68 polymorphism: a family-based study on mentally retarded children
Samikshan Dutta, Swagata Sinha, Anindita Chattopadhyay, Prasanta Gangopadhyay, Jotideb Mukhopadhyay, Manoranjan Singh, Kanchan Mukhopadhyay
Behavioral and Brain Functions , 2005, DOI: 10.1186/1744-9081-1-25
Abstract: The present study is aimed at investigating the association between T833C/844ins68 polymorphism and MR. One hundred and ninety MR cases were recruited after psychometric evaluation. Hundred and thirty-eight control subjects, two hundred and sixty-seven parents of MR probands and thirty cardiovascular disorder (CVD) patients were included for comparison. Peripheral blood was collected after obtaining informed written consent. The T833C/844ins68 polymorphism was investigated by PCR amplification of genomic DNA and restriction fragment length polymorphism analysis, followed by statistical analysis.The genotypic distribution of the polymorphism was within the Hardy-Weinberg equilibrium. A slightly increased genotypic frequency was observed in the Indian control population as compared to other Asian populations. Both haplotype-based haplotype relative risk analysis and transmission disequilibrium test reveled lack of association of the T833C/844ins68 polymorphism with MR; nevertheless, the relative risk calculated was higher (>1) and in a limited number of informative MR families, preferential transmission of the double mutant from heterozygous mothers to the MR probands was noticed (χ2 = 4.00, P < 0.05).This is the first molecular genetic study of CBS gene dealing with T833C/844ins68 double mutation in MR subjects. Our preliminary data indicate lack of association between T833C/844ins68 polymorphism with MR. However, higher relative risk and biased transmission of the double mutation from heterozygous mothers to MR probands are indicative of a risk of association between this polymorphism with mental retardation.Cystathionine β-synthase (CBS) catalyzes the condensation of serine and homocysteine to form cystathionine and abnormality in CBS activity is manifested in two major clinical conditions, viz. hyperhomocysteinemia and homocystinuria. Insufficiency in CBS activity may lead to hyperhomocysteinemia [1], which is considered to be an independent risk factor for arteri
A Comparative Study of Closure of Tympanic Membrane Perforation between Chemical Cauterization and Fat Plug Myringoplasty  [PDF]
Manabendra Debnath, Swagata Khanna
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2013, DOI: 10.4236/ijohns.2013.26052

The purpose of closure of small dry tympanic membrane perforations is to restore the continuity of the tympanic membrane in order to improve hearing and decrease the incidence of middle ear infections. Small and cost effective procedures like Chemical Cauterization and Fat Plug Myringoplasty have been found to be effective in healing small central perforations with significant hearing improvement. A study was carried out in 69 patients with central perforations in the Department of ENT, Gauhati Medical College & Hospital for the duration of 1 year from August 11 to July 12. Out of 69 patients, 36 underwent Chemical Cauterization and 33 Fat Plug Myringoplasty. Pre-and post-operative hearing assessments of each patient were done and statistically analyzed. The success rate was found to be 83.33% and 90.9% respectively. In both groups, there was statistically significant hearing improvement with a P value 0.01. From our study, it was found that the two procedures are simple, reliable and also lessened the morbidity of the patient. Thus we recommend the use of these two official procedures for the treatment of central perforations of tympanic membrane less than 5 mm.

Angiolymphoid Hyperplasia with Eosinophilia—A Case Report  [PDF]
Pankaj Kumar Doloi, Swagata Khanna
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2012, DOI: 10.4236/ijohns.2012.12009
Abstract: Angiolymphoid hyperplasia with eosinophilia is a rare, benign vascular tumor affecting principally the head and neck region of young adult females. Microscopic analysis reveals hyperplastic blood vessels lined by a hypertrophic endothelium. An inflammatory infiltrate rich in eosinophils is also present. Etiology of the lesion is unknown. Various treatment modalities have been described. We present a case successfully treated by excision and local steroid infiltration.
Extreme metabolic alkalosis in intensive care
Tripathy Swagata
Indian Journal of Critical Care Medicine , 2009,
Abstract: Metabolic alkalosis is a commonly seen imbalance in the intensive care unit (ICU). Extreme metabolic alkalemia, however, is less common. A pH greater than 7.65 may carry a high risk of mortality (up to 80%). We discuss the entity of life threatening metabolic alkalemia by means of two illustrative cases - both with a pH greater than 7.65 on presentation. The cause, modalities of managing and complications of this condition is discussed from the point of view of both the traditional method of Henderson and Hasselbalch and the mathematical model based on physiochemical model described by Stewart. Special mention to the pitfalls in managing patients of metabolic alkalosis with concomitant renal compromise is made.
Cognitive Radio Sensor Node Empowered Mobile Phone for Explosive Trace Detection  [PDF]
Swagata Roy Chatterjee, Mohuya Chakraborty, Jayanta Chakraborty
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.41004
Abstract: Usefulness of sensor network applications in human life is increasing day by day and the concept of wireless connection promises new application areas. Sensor network can be very beneficial in saving human life from terrorist attacks causing explosion in certain areas leading to casualties. But realization of the sensor network application in explosive detection requires high scalability of the sensor network and fast transmission of the information through real time monitoring and control. In this paper a novel mechanism for explosive trace detection in any populated area by the use of mobile telephony has been described. The aim is to create a system that will assure common men, local population and above all the nation a secured environment, without disturbing their freedom of movement. It would further help the police in detection of explosives more quickly, isolation of suicide bombers, remediation of explosives manufacturing sites, and forensic and criminal investigation. To achieve this, the paper has projected an idea that can combine the strength of the mobile phones, the polymer sensor and existing cellular network. The idea is to design and embed a tiny cog-nitive radio sensor node into the mobile phone that adapts to the changing environment by analyzing the RF surroundings and adjusting the spectrum use appropriately. The system would be capable of detecting explo-sives within a defined territory. It would communicate the location of the detected explosives to the respec-tive service provider, which in turn would inform the law and enforcement agency or Police.
Prevalence of Symptoms of Obstructive Sleep Apnoea in Children Undergoing Routine Adenotonsillectomy  [PDF]
Swagata Khanna, Sunil KC, Mahamaya Prasad Singh
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2012, DOI: 10.4236/ijohns.2012.13020
Abstract: Introduction: Obstructive sleep apnoea (OSA) is a condition characterized by episodic partial or complete obstruction of the upper airway during sleep leading to apnoea or cessation of breathing. Obstruction of the upper airway during sleep may result in the generation of noise (snoring), reduction (hypopnoea) or cessation (apnoea) of airflow at the nostrils and mouth. There are multiple indications for undertaking a patient for adenoidectomy and/or tonsillectomy with obstructive sleep apnoea (OSA) being one among many. Objective: The aim of the present study was to find the prevalence of OSA symptoms in children undergoing adenotonsillectomy for indications other than that of obstructive sleep apnoea. Material & Methods: The study was conducted in the Department of ENT and Head & Neck surgery, Gauhati Medical College & Hospital, Guwahati for a period of one year. Twenty six patients who underwent adenoidectomy and/or tonsillectomy during this period were selected for the study. The parents of the patients were administered the Paediatric Sleep Questionnaire pre-operatively and the patients were evaluated for any symptoms of OSA. A score of 8 or more was suggestive of presence of breathing related sleep disorder. All statistical analyses were performed using statistical software SPSS 16.0 version. To test for the difference in the proportion between different variables, chisquare/fisher exact test where appropriate were employed. All statistical tests were two tailed with 0.05 as the threshold level of significance. Results: 11 children (42.3%) had a score of 8 or more out of the 26 children in Paediatric sleep questionnaire. The chi square for this was 4.696 with a p value of 0.096. The snoring subscale was found to be positive in 19 children (73.1%). All children with score of 8 or more were positive for the snoring scale. The sleepiness subscale was found to be positive in 14 children (53.8%). 10 of the 11 children were positive for sleepiness scale among the children who had a score of 8 or more in the questionnaire. These were found to be statistically significant. Conclusion: A significant population of the children undergoing routine adenotonsillectomy also has symptoms of obstructive sleep apnoea. The pathophysiology of obstructive sleep apnoea should be borne in mind in all children having adenotonsillar hypertrophy and a prompt and early intervention into these children should be aimed for both the infective etiology and the possible
Symmetric peripheral gangrene: Catch it early!
Tripathy Swagata,Rath Biswajeet
Journal of Emergencies, Trauma and Shock , 2010,
Effect of secondary decay on isoscaling: Results from the canonical thermodynamical model
Gargi Chaudhuri,Swagata Mallik
Physics , 2010, DOI: 10.1016/j.nuclphysa.2010.11.001
Abstract: The projectile fragmentation reactions using $^{58}Ni$ $\&$ $^{64}Ni$ beams at 140 MeV/n on targets$^{9}Be$ $\&$ $^{181}Ta$ are studied using the canonical thermodynamical model coupled with an evaporation code. The isoscaling property of the fragments produced is studied using both the primary and the secondary fragments and it is observed that the secondary fragments also respect isoscaling though the isoscaling parameters $\alpha$ and $\beta$ changes. The temperature needed to reproduce experimental data with the secondary fragments is less than that needed with the primary ones. The canonical model coupled with the evaporation code successfully explains the experimental data for isoscaling for the projectile fragmentation reactions.
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