Synthesis and Characterization of MnFe2O4 / Graphene / Epoxy Nanocomposites

Ternary MnFe2O4/graphene/epoxy nanocomposites have been synthesized using chemical co-precipitation and solid state methods having different concentration of graphene. The obtained ternary nanocomposites and pure MnFe2O4 have been characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy to obtain the structural, morphological and dielectric properties. The crystallite size of MnFe2O4 has been calculated using Scherer formula, which was found to be 1.3 nm. The agglomeration of particles with surface roughness was obtained by SEM analysis. The device has been fabricated using silver coating in terms of capacitor to characterize dielectric properties. It has also been observed from dielectric analysis as concentration of graphene increases from 1% to 10%, the value of gradient of dielectric decreases and also loss tangent decreases on increasing concentration of graphene

Spectrum of Childhood and Adolescent Ovarian Tumors in India: 25 Years Experience at a Single Institution

BACKGROUND: Ovarian tumour in children and adolescent girls form an uncommon but important part of gynaecological malignancies. They account for 1% of all the childhood malignancies and 8% of all abdominal tumours in children. Since the ovarian cysts are thought to arise from mature follicles, these tumours were considered to be infrequent in the paediatric population.AIM: The rarity of this condition prompted us to conduct this study and share our experience on the incidence and clinicopathological features of different ovarian tumours in girls up to 20 years of age observed in last 25 years at a single tertiary care hospital.MATERIAL AND METHODS: This was a retrospective study conducted in the Department of Pathology at a tertiary hospital, Delhi. All ovarian tumours up to the age of 20 years in the past 25 years (1990-2014) were included for the purpose of studying the clinicopathological aspects of ovarian tumours in this age group. Descriptive statistics for prevalence and age-wise prevalence was done. Chi-square test, to find an association between the age, laterality and size with malignancy was performed.RESULTS: We received a total of 1102 cases of ovarian tumours over the period of 25 years  (1990 to 2014), of which 112 (10%) cases were seen in girls up to 20 years of age. The mean age of the patients was 15.3 ± 4 years. The most common presenting complaint was pain abdomen (46.4 %) There was a statistically significant correlation found between size and malignancy status of tumours in our study (p = 0.00). Of 112 cases of ovarian tumours, 39/112 (34.8%) were malignant and 73/112 (65.2%) were benign. Mature  cystic teratoma (27.6%) was the most common type of benign tumour in this age group and immature teratomas were the most common type of malignant ovarian neoplasms.CONCLUSION: Premenarchal girls with ovarian masses may have varied presentations. Abdominal pain is the most common presenting complaint of young adolescent girls with adnexal masses. So the index of suspicion should be kept high and prompt investigations like ultrasound must be performed early to rule out such adnexal masses. Immature Teratoma was the most common malignant and mature cystic teratoma was the most common benign tumour in our study

Comparative study of physicochemical properties of CoFe2O4/MWCNT nanocomposites

CoFe2O4/MWCNT (CFO/MWCNT) nanocomposites have been synthesized using Co-precipitation and solid state method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and impedance spectroscopy have been used to determine structural, morphological and dielectric properties of synthesized nanocomposites. The particle size was found to be 3 nm, 3.3 nm and 4 nm for CFO, C-CFO/MWCNT and G-CFO/MWCNT, respectively, using Scherrer formula. Aggregation of nanoparticles has been acquired by SEM analysis. From impedance spectroscopy, it has been observed that the dielectric constant decreases with increase in frequency and dielectric constant and loss both are more for C-CFO/MWCNT nanocomposites than that are for G-CFO/MWCNT nanocomposites

Correlation of FOXL2 with Inhibin and Calretinin in the Diagnosis of Ovarian Sex Cord Stromal Tumors

Objective: Alpha-inhibin and calretinin have been traditionally used as immunomarkers for sex cord stromal tumors. However, the variation in their immunoreactivity and their lack of specificity for sex cord stromal tumor makes the search for a more sensitive and specific immunohistochemical marker essential in routine diagnosis of sex cord stromal tumor. This study was conducted to correlate the diagnostic utility of FOXL2 with inhibin and calretinin in the diagnosis of sex cord stromal tumors of ovary. Material and Method: The study was conducted in the department of pathology. 31 cases of sex cord tumors received in past eight years (2002-2010) were included in this study. Immunostaining for inhibin, calretinin and FOXL2 was performed and compared on the basis of staining intensity and percentage positivity on all the cases. Results: Calretinin was found to be positive in 29/31 sex cord stromal tumors with variable intensities and was negative in two cases of sex cord stromal tumors, inhibin was positive in 28/31 and only three cases had no cytoplasmic staining. All the 31 cases included in this study were positive for FOXL2 with variable staining intensities and percentage positivity. Ten cases of each surface epithelial and germ cell tumors were also negatively stained with FOXL2. Conclusion: In contrast to inhibin and calretinin, FOXL2 had a sensitivity and specificity of 100% for all the cases of sex cord stromal tumors included in this study

Intraosseous glomus tumor of distal phalanx, thumb :A rare case report

Glomus tumors are rare benign neoplasms of glomus bodies. Commonly encountered in the subungal region of digits these can be found anywhere in the body. Although some rarely encountered sites including stomach liver synovium etc. have been reported, intraosseous location of these tumors have been described in less than 25 cases in the literature. We present a case of a 60 year old female presenting with complaints of stabbing pain for past 2-3 years in the distal phalanx of the right thumb. Radiography revealed a well demarcated cystic lesion in the distal phalanx. Microscopy and immunohistochemistry were suggestive of an intraosseous glomus tumor. Since the occurrence of these tumors in the bone is very rare and there are 10% chances of recurrence and even smaller chance of malignant transformation, correct diagnosis and complete excision is essential for better prognosis of the patients

Synthesis and Characterization of MnFe2O4 / Graphene / Epoxy Nanocomposites

75-77Ternary MnFe2O4/graphene/epoxy nanocomposites have been synthesized using chemical co-precipitation and solid state methods having different concentration of graphene. The obtained ternary nanocomposites and pure MnFe2O4 have been characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and impedance spectroscopy to obtain the structural, morphological and dielectric properties. The crystallite size of MnFe2O4 has been calculated using Scherer formula, which was found to be 1.3 nm. The agglomeration of particles with surface roughness was obtained by SEM analysis. The device has been fabricated using silver coating in terms of capacitor to characterize dielectric properties. It has also been observed from dielectric analysis as concentration of graphene increases from 1% to 10%, the value of gradient of dielectric decreases and also loss tangent decreases on increasing concentration of graphene

Comparative study of physicochemical properties of CoFe2O4/MWCNT nanocomposites

93-95CoFe2O4/MWCNT (CFO/MWCNT) nanocomposites have been synthesized using Co-precipitation and solid state method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and impedance spectroscopy have been used to determine structural, morphological and dielectric properties of synthesized nanocomposites. The particle size was found to be 3 nm, 3.3 nm and 4 nm for CFO, C-CFO/MWCNT and G-CFO/MWCNT, respectively, using Scherrer formula. Aggregation of nanoparticles has been acquired by SEM analysis. From impedance spectroscopy, it has been observed that the dielectric constant decreases with increase in frequency and dielectric constant and loss both are more for C-CFO/MWCNT nanocomposites than that are for G-CFO/MWCNT nanocomposites