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Optical characterization of nano-sized organic carbon particles emitted from a small gasoline engine

Particuology 2013年第3期11卷 249-255页

作者： Bireswar Paul Amitava Datta Aparna Datta abhijit saha Department of Power Engineering Jadavpur University UGC-DAE Consortium for Scientific Research

The nano-sized organic carbon （NOC） particles emitted from a small gasoline engine were characterized using various ex situ optical techniques to assess their hazardous impact. The exhaust gas was sampled iso-kinetically by a quartz probe and passed through de-ionized water to gather the hydrophilic car- bonaceous particulates as hydrosol. The hydrodynamic diameter of the particles ranged between 1.7 and 3.6 nm at no load, with a mean diameter of 2.4 nm. The particle size in the engine exhaust was found to increase at higher loads, which is attributed to coagulation of the particles. The chemical structure of the particles was analyzed using UV-vis and infra-red spectroscopy. Both the band gap energy and oscillator strength data evaluated from the UV-vis absorbance showed that the NOC particles contained polyaromatic hydrocarbon structures with three to five aromatic rings. Infra-red spectroscopy analysis further confirmed the presence of aliphatic and carbonyl functionalities in the aromatic structures of the particles. The fine size of the particles, their high number concentration for the type of the engine under study and their structural features, make the particles extremely hazardous for environment and health.

关键词： Gasoline engine Combustion Emission Carbon nano-particle Characterization

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Indistinguishable cellular changes in gastric mucosa between Helicobacter pylori infected asymptomatic tribal and duodenal ulcer patients

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World Journal of Gastroenterology 2009年第9期15卷 1105-1112页

作者： Dhira Rani saha Simanti Datta Santanu Chattopadhyay Rajashree Patra Ronita De Krishnan Rajendran abhijit Chowdhury Thandavaryan Ramamurthy Asish Kumar Mukhopadhyay Division of Histology & Electron microscopy. National Institute of Cholera and Enteric Diseases P 33 CIT Road Scheme XM Beliaghata Kolkata 700010 India School of digestive diseases Institute of Post Graduate Medical Education and Research 244 AJC Bose Road Kolkata 700020 India Division of Bacteriology National Institute of Cholera and Enteric Diseases P 33 CIT Road Scheme XM Beliaghata Kolkata 700010 India Data management Division National Institute of Cholera and Enteric Diseases P 33 CIT Road Scheme XM Beliaghata Kolkata 700010 India

AIM： To investigate the changing pattern of different histological parameters occurring in the stomach tissue of Helicobacter pylori （H pylori） infected tribal populations and duodenal ulcer patients among ethnic Bengalis and correlation of the genotypes of H pylori with different histological parameters. METHODS： One hundred and twelve adult individuals were enrolled into this study between 2002 and 2004. Among them, 72 had clinical features of duodenal ulcer （DU） from ethnic Bengali population and 40 were asymptomatic ethnic tribals. Endoscopic gastric biopsy samples were processed for histology, genotyping and rapid urease test. Histologically, haematoxylin and eosin staining was applied to assess the pathomorphological changes and a modified Giemsa staining was used for better detection of Hpylori. For intestinal metaplasia, special stainings, i.e. Alcian blue periodic acid-Schiff and high iron diamine-Alcian blue staining, were performed. PCR was performed on bacterial DNA to characterize the presence or absence of virulence-associated genes, like cagA, and distribution of different alleles of vacA and iceA. RESULTS： Intraglandular neutrophil infiltration, a hallmark of activity of gastritis, was present in 34 （94%） of tribals （TRs） and 42 （84%） of DU individuals infected with H pylori. Lymphoid follicles and aggregates, which are important landmarks in H pylori infection, were positive amongst 15 （41%） of TRs and 20 （40%） of DU subjects. Atrophic changes were observed in 60% and 27.7%, respectively, among DU cases and tribals （P 〉 0.003）. Metaplastic changes were detected in low numbers in both groups. Moderate to severe density distribution of Hpylori in the gastric mucosa was 63% among TRs, whereas it was 62% in DU subjects. There were no significant differences in the distribution of virulence-associated genes like cagA, vacA and iceA of H pylori strains carried by these two populations. CONCLUSION： Our study showed almost similar distribution of inflammato

关键词： Helicobacter pylori Tribal Neutrophil Mononuclear cells infiltration Lymphoid follicles

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Collagen membrane functionalized with magnesium oxide via room-temperature atomic layer deposition promotes osteopromotive and antimicrobial properties

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Bioactive Materials 2023年第12期30卷 46-61页

作者： Soumya saha Raphael Cavalcante Costa Mirela Caroline Silva Joao Matheus Fonseca-Santos Lin Chen abhijit H.Phakatkar Harshdeep Bhatia Leonardo P.Faverani Valentim A.R.Barao Tolou Shokuhfar Cortino Sukotjo Christos Takoudis Department of Biomedical Engineering University of Illinois ChicagoChicagoUSA Department of Prosthodontics and Periodontology Piracicaba Dental SchoolUniversity of Campinas(UNICAMP)PiracicabaSao PauloBrazil Department of Diagnosis and Surgery Division of Oral and Maxillofacial Surgery and ImplantologySao Paulo State University(UNESP)School of DentistryAraçatubaSao PauloBrazil Department of Periodontics Center for Wound Healing and Tissue RegenerationCollege of DentistryUniversity of Illinois ChicagoChicagoUSA Department of Chemical Engineering University of Illinois ChicagoChicagoUSA Department of Restorative Dentistry University of Illinois Chicago College of DentistryChicagoUSA

Artificial bone grafting materials such as collagen are gaining interest due to the ease of production and ***,collagen must be supplemented with additional coating materials for improved ***,we report room-temperature atomic layer deposition(ALD)of MgO,a novel method to coat collagen membranes with *** techniques such as X-ray photoelectron spectroscopy,Raman spectroscopy,and electron beam dispersion mapping confirm the chemical nature of the *** electron and atomic force microscopies show the surface topography and morphology of the collagen fibers were not altered during the ALD of *** release of magnesium ions promotes bone growth,and we show the deposited MgO film leaches trace amounts of Mg when incubated in phosphate-buffered saline at 37◦*** coated collagen membrane had a superhydrophilic surface immediately after the deposition of *** film was not toxic to human cells and demonstrated antibacterial properties against bacterial ***,in vivo studies performed on calvaria rats showed MgO-coated membranes(200 and 500 ALD)elicit a higher inflammatory response,leading to an increase in angiogenesis and a greater bone formation,mainly for Col-MgO500,compared to uncoated *** on the characterization of the MgO film and in vitro and in vivo data,the MgO-coated collagen membranes are excellent candidates for guided bone regeneration.

关键词： coating magnesium atomic

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Sustainable Denim Washing by Process Optimization

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Journal of Textile Science and Technology 2022年第4期8卷 149-162页

作者： Md. Abu Bakar Siddiquee A. T. M. Gulam Moula Joy Krisna saha Md. Humayun Kabir Khan Zihan Kaisar abhijit Roy Department of Textile Engineering Mawlana Bhashani Science & Technology University Tangail Bangladesh Department of Fabrics Engineering Bangladesh University of Textiles Dhaka Bangladesh

Now-a-days sustainability is a crucial issue in denim washing. This research initiative is performed aiming to resolve the crisis of sustainability in denim washing by process optimization technique which highlights the reduction of water, chemical and time as well as costing of denim garments. In this research work, process optimization technique is administered by reducing several wash & chemical application baths into a single bath confirming without alteration of physical properties and color fastness of denim fabric. For confirmation without alteration of physical properties and color fastness, several tests are carried out like tensile and tear strength, color fastness to rubbing, color fastness to wash, color fastness to water, color fastness to perspiration and CMC (Carboxy Methyl Cellulose) value for both conventional and sustainable washing method. BOD, COD and pH of waste water is determined which shows better result in sustainable washing method also. Reduction of rinsing time in sustainable washing method results in less consumption of water by 475 and process time by 19% and also saves $0.34/ dozen garments which validate the cost effectiveness of this sustainable washing method.

关键词： Sustainability Denim Wash Color Fastness Cost Analysis

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