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Cross linked Core-shell Silica Nanoparticles Mechanical, Structural & Viscoelastic Behavior
Get PDFShell cross-linked core-shell nanoparticles (SCCSNs) were prepared via miniemulsion polymerization of styrene in the presence of silane modified inorganic silica. The polystyrene (PS) shell of 69.8% in weight fraction was cross-linked using divinylbenzene. SCCSNs were spherical with a diameter distribution from 37 to 96 nm determined by dynamic light scattering. Dynamic rheology of SCCSNs suspended in PS/toluene solution was compared with that of suspensions of naked silica. The critical strain for onset of rheological nonlinearity was independent of SCCSN concentration above a concentration threshold, which differs from the silica suspensions. Linear dynamic rheological investigation revealed that SCCSN suspensions with a PS volume fraction of 25% were fluid-like at low particle concentrations while suspensions containing 4.5 vol% SCCSNs formed a gel-like structure. On the contrary, the silica suspensions with 20.0 vol% PS underwent a fluid-to-solid-like transition with increasing silica concentration. Reasons for the different rheological behaviors of the naked silica and SCCSN suspensions are discussed
Enhancement of Electrical and Mechanical Properties of Polycarbonate/Poly(Ethylene Oxide) and Carbon Black Composite
Get PDFElectrically conducting composites consisting of polycarbonate/poly(ethylene oxide) (PC/PEO) and carbon black (CB) were prepared by solution method. Results showed that the dispersion of CB in the blend matrix was uniform due to interaction between the blend components (PC/PEO) and CB particles. Scanning electron microscopic (SEM) images showed fine dispersion of connected granular CB composite particles. The electrical conductivity and mechanical properties of PC/PEO/CB 1-10 composites were strongly dependent on the filler content. The yield strength of the composites increased from 41-71 MPa compared with neat blend (27 MPa). The electrical conductivity of PC/PEO/CB 1-10 was in the range of 1.1×10-2 to1.1 Scm-1 relative to neat blend (10-12 Scm-1)
Topical Progression in Organic and Inorganic Membranes for Advance Application: A Review
Get PDFOrganic and inorganic nano-porous filtration membranes have been discussed in this review, as emergent water treatment technology for elite protection of human health and environment. Self-assembled block copolymer has evolved as influential tool to fabricate organic nano-porous materials with well-defined morphology, pore size and distribution, porosity and surface chemistry. These types of nano-porous materials are attractive for regulation and detection of transport at molecular level. The literature inspection presented in this article typically addressed exploration of relevant aspects such as polymerization method, surface morphology, membrane thickness, and active porosity affecting membrane performance. Similarly, considerable efforts towards fabricating ordered and water-permeable inorganic membranes were debated. In both type of membranes, fine control over pore dimensions, structural characteristics, and physical behavior of nano-structures hang about a major challenge
Measuring the Impact of Supply Chain in the Performance of Human Resource: An Empirical Study of Private Management & Engineering Colleges in Lucknow, India
Get PDFThe supply chain function in organization has been changed significantly in recent decades and is now become one of the most important strategic functions for the accomplishment of organizational objectives. As a result of globalization, competition, modernization and technological changes supply chain themselves have become very complex. Despite of strategies has been taken by organization for competitive advantage through supply chain, it is impossible to think about success without effective human performance in the supply chain. Therefore, it is fair to say that HRM is key element for the success of organization goals.The purpose of the paper is to call attention to the importance of HRM in supply chain and draw conclusion from the collected data.
The Curious Incident Of 3 Melanomas And Their Possible Origins – A Case Report and Review of Literature (Withdrawn article)
No full textBackground: We describe an unusual case of 2 intra-parenchymal breast melanomas with a concomitant subcutaneous melanoma in the ipsilateral upper limb and no definite primary lesion.Case Report: Our patient is a 40-year-old Chinese female who presented with a breast lump in her left breast for which excision biopsy showed melanoma. A PET-CT revealed a second lesion in her breast. A left upper arm nodule with no overlying skin changes was also noted. She underwent a mastectomy and excision biopsy of the upper arm nodule. Histology showed that the second breast lesion was also a melanoma, while the arm nodule contained melanoma cells within a fibrous capsule.Conclusion: The presence of a melanoma in the breast should prompt a close and meticulous search for a primary lesion and potential signs of metastasis. Encapsulated subcutaneous nodules can be attributed to replaced lymph nodes or subcutaneous melanoma which can be either primary dermal melanoma or metastasis from an unknown primary
Assessment of Invitro Anticancer Potential of Marine Derived Fungus Collected from South West Coast of Tamilnadu
Get PDFCancer is currently one of the most globally prevalent diseases. Furthermore, the incidence of cancer is steadily increasing, accompanying the ageing and growth of populations, as well as imbalanced life-styles and declining environmental conditions. The present work describes the anticancer activity of marine sediment derived fungus obtained during the course of sampling. The marine sediments were collected from the south west coastal area of Tamilnadu. Sampling results in the isolation of 58 fungi belongs to 37 genera. Among the 58 fungal isolates, the frequent fungus Aspergillus flavus was isolated from the sediment based on frequency of distribution, while it was cultured on Potato Dextrose Agar (PDA) amended with streptomycin 150 units/ml. The second half of the study was based on the production of secondary metabolites on different fermentation medium. The metabolites were concentrated using rotary vacuum evaporator. The anticancer activity of the metabolites was evaluated on HeLa cell lines purchased from National centre for cell sciences, Pune. Further the result revealed that the metabolite produced by the isolated fungus has showed positive cell inhibitory effect on cell lines. The determined IC50 value of the metabolite was 29.03 µg/ml. The study concludes that the marine derived organisms especially fungus is a promising target to be exploited against the hunt for cancer
Phytochemistry and Antimicrobial Properties of 2:1 and 1:2 Ethanol-methanol Extracts of Tetrapleura Tetraptera
Get PDFTetrapleura tetraptera (Aidan)-an African medicinal plant was analysed for its phytochemicals and its antimicrobial activity using 1:2 and 2:1 ethanol-methanol as solvents for extraction. Amongst the phytochemicals present in the plant, oxalates, cyanogenic glycosides, tanins and phytic acids were quantified. The solvents produced different degrees of extraction of these phytochemicals as well as their antimicrobial activity. The 2:1 methanol: ethanol solvent extracted 1.425%, 0.70 mg/100g, 0.315 mg/100g, 10.805 mg/100g and 0.50% while the 2:1 ethanol: methanol solvent extracted 5.43%, 0.705 mg/100g, 0.52 mg/100g, 7.365 mg/100g and 0.635% of oxalates, cyanogenic glycosides, tanins and phytic acids respectively. Considering the antimicrobial activity of the 1:2 ethanol: methanol extracts. There was a corresponding decrease in susceptibility with decrease in the concentration of the extract indicating that the concentration of the plant extract has an effect on the isolates. The results also revealed that the isolates were all sensitive to high concentrations of 250mg/ml and 125mg/ml of the plant extract but demonstrated varied response to the 62.5mg/ml and 31.25mg/ml of the plant extract. On the other hand, the 2:1 ethanol: methanol extract was also characterized by a low activity at a low concentration of 31.25mg/ml and 62.5mg/ml. The Ethanol: methanol 2:1 extract of T. tetraptera is a better extraction method than the 1:2 ethanol: methanol extract as demonstrated by the phytochemistry and antimicrobial activity of the plant
Biochemical Characterization of High Mercury Tolerance in a Pseudomonas Spp. Isolated from Industrial Effluent
Get PDFA mercury resistant Pseudomonas spp. was isolated from industrial effluent that was able to tolerate 200 µM HgCl2. The Hg2+-resistant Pseudomonas spp. exhibited elevated stress-regulatory mechanisms as indicated by its high and inducible mercury reductase activity, high intrinsic catalase activity and enhanced resistance to Hg2+-induced release of protein-bound iron. An enhanced resistance of the bacterium to Hg2+-induced lipid peroxidation was observed as indicated by 40% lower conjugated diene and 60% lower lipid hydroperoxide content compared to a non-mercury resistant strain Pseudomonas aeruginosa (ATCC 27853). Phospholipid (PL) analysis of both the species reveled intrinsic differences in their PL composition. We observed 80% PE, 15% PG and 5% of an unidentified PL (U) in MRP compared to 65% PE, 20% PG and 17% CL in Pseudomonas aeruginosa (ATCC 27853). Mercury toxicity led to significant reorganization of PL in Pseudomonas aeruginosa (ATCC 27853) compared to MRP. While HgCl2 led to 25% increase in PE, 35% depletion in CL and 27% depletion in PG content of Pseudomonas aeruginosa (ATCC 27853), MRP exhibited only 5% enhancement in PE content that was accompanied by 20% depletion in PG content, indicating that MRP resists mercury induced PL organization. Interaction of the MRP with polystyrene surface showed two fold higher Hg2+-induced exopolysaccharide secretion and elevated biofilm forming ability compared to Pseudomonas aeruginosa (ATCC 27853). Our investigation reveals a novel Pseudomonas spp. with high Hg2+-tolerance mechanisms that can be utilized for efficient bioremediation of mercury
Re-evaluation of Metaplastic Osteogenesis in the Bovine Lymph Node with Metastatic Cholangiocarcinoma: A Supplemental Report
Get PDFIntroduction: For deepening knowledge of the developmental process involving metaplastic osteogenesis in extraskeletal tumor, histopathological re-evaluation was conducted on osseous metaplasia in the bovine lymph node with metastatic cholangiocarcinoma, which was previously reported in this journal by the author.Presentation of Case: In an aged Holstein-Friesian dairy cow that exhibited intrahepatic cholangiocarcinoma with widespread metastasis, a mesenteric lymph node with metastatic cancer had multifocal areas of osseous metaplasia. Abundant stromal connective tissue of the metastatic cancer showed prominent proliferation of capillaries and mesenchymal cells. There were no definite transitional features between mesenchymal cells associated with bone tissue and cancer cells. A variety of stages toward differentiating into osseous component included occurrence of (1) focal areas of dense collagen fibers accompanied by many mesenchymal cells, (2) osteoid surrounded by a single to multilayer of osteoblasts, (3) trabeculae of woven bone containing many osteocytes, and (4) bone resorption associated with osteoclastic activity in more differentiated bone trabeculae. These findings suggested that osseous metaplasia might have developed through the process identical to intramembranous ossification, as seen in flat bone formation in the developing fetus. Furthermore, this metaplastic osteogenesis was associated with the process involving the coordinated activities of osteoblasts and osteoclasts, as seen in remodeling of bone tissue throughout postnatal life.Conclusion: Although metaplastic bone did not fully differentiated into mature bone, the pathway of metaplastic osteogenesis might have followed the developmental stages identical, to some degree, to the process that controls skeletal maturation and remodeling.
Malignant Transformation of Erosive Oral Mucosal Lichen Planus To Oral Squamous Cell Carcinoma: A Case Report and a Review of the Literature
Get PDFIntroduction: Oral Mucosal Lichen Planus (OMLP) is a chronic inflammatory skin disease, usually benign that affects all areas of the oral mucosa. Its diagnosis is based on the clinical examination and histological analysis. The erosive form presents a risk of malignant transformation from 0.3% to 3%, justifying the strict surveillance of the disease and effective treatment of relapses.Case report: This is a 65 years old woman, without specific and non smoking history, reported to the Oral Surgery Department of the Consultation Center of Dental Treatment of Rabat, presenting oral lesions lasting for four years. The intraoral examination revealed the presence of white lesions in the form of plates sitting on the entire right side edge of the tongue. A biopsy was performed and concluded an erosive oral lichen planus which has been transformed to Oral Squamous Cell Carcinoma.Discussion: Malignant transformation of the OMLP is rare and remains a subject of controversy despite numerous studies that have been devoted. It occurs most often on the atrophic and erosive forms. Several assumptions have been suggested to explain this malignant transformation, but the chronic inflammation seems to be the key factor. Tobacco and alcohol are well known carcinogenic factors, may contribute to the malignant transformation of the OMLP, but it turns out that this disease affects mostly women who have no-smoking Ethylo intoxication. So there must be other factors