483 research outputs found
Food for nought
No full textThe short story, "Food for nought", is written by the listed author above, Shashi Bhat. Now in its 48th year, Best Canadian Stories has long championed the short story form and highlighted the work of many of the writers, throughout their respective careers, who have gone on to shape the Canadian literary canon. Caroline Adderson, Margaret Atwood, Clark Blaise, Lynn Coady, Mavis Gallant, Zsuzsi Gartner, Douglas Glover, Steven Heighton, Isabel Huggan, Mark Anthony Jarman, Norman Levine, Rohinton Mistry, Alice Munro, Leon Rooke, Diane Schoemperlen, Russell Smith, Linda Svendsen, Kathleen Winter, and many others have appeared in its pages over the years and decades, making Best Canadian Stories the go-to source for what’s new in Canadian fiction writing for close to five decades. A continuation of not only a series, but a legacy in Canadian letters. --From publisher description.Published
TWO NEW SPECIES OF POACEAE FROM INDIA
No full textTwo new species of Poaceae namely, Erayrostis santapaui K. G. Bhat & C. R. Nagendran and Chrysopogon pseitdozeylanicus K. G. Bhat & C. R. Nagendran have been described from materials collected by the senior author from Coorg- and South Kanara Districts of Karnataka State, India
Fish distribution dynamics in the Aghanashini estuary of Uttara Kannada, west coast of India
No full textFish diversity (77 species) in the Aghanashini River estuary of the Indian west coast is linked to variable salinity conditions and zones I, II and III for high, medium and low salinity respectively. Zone I, the junction between Arabian Sea and the estuary, had all species in yearly succession due to freshwater conditions in monsoon to high salinity in pre-monsoon. The medium (zone II) and low (zone III) salinity mid and upstream portions had maximum of 67 and 39 fish species respectively. Maintenance of natural salinity regimes in estuary, among other ecological factors, is critical for its fish diversity
Assessing the knowledge of dietitians regarding diet and oral health in Bengaluru city
No full textObjective: To assess the knowledge of dietitians regarding diet and oral health in Bengaluru city. Materials and Methods: A cross-sectional study was conducted among the life members of Indian Dietetic Association, Bangalore chapter. A close ended, self-administered 23 item questionnaire was distributed and collected after 10 min. The data was subjected to statistical analysis. Results: About 36% felt dietary supplements can prevent oral mucosal diseases, and only 12% were aware that high content of fluoride in water leads to abnormal tooth defects. Overall knowledge of dietitians pertaining diet and oral health was 56.48%. Conclusion: Study highlights the deficiency of knowledge of dietitians regarding oral health. The multifaceted interactions between diet and oral health in practice, education and research in both dietetics and dentistry merit detailed delineation
Neuropeptide VGF Promotes Maturation of Hippocampal Dendrites That Is Reduced by Single Nucleotide Polymorphisms
No full textThe neuropeptide VGF (non-acronymic) is induced by brain-derived neurotrophic factor and promotes hippocampal neurogenesis, as well as synaptic activity. However, morphological changes induced by VGF have not been elucidated. Developing hippocampal neurons were exposed to VGF through bath application or virus-mediated expression in vitro. VGF-derived peptide, TLQP-62, enhanced dendritic branching, and outgrowth. Furthermore, VGF increased dendritic spine density and the proportion of immature spines. Spine formation was associated with increased synaptic protein expression and co-localization of pre- and postsynaptic markers. Three non-synonymous single nucleotide polymorphisms (SNPs) were selected in human VGF gene. Transfection of N2a cells with plasmids containing these SNPs revealed no relative change in protein expression levels and normal protein size, except for a truncated protein from the premature stop codon, E525X. All three SNPs resulted in a lower proportion of N2a cells bearing neurites relative to wild-type VGF. Furthermore, all three mutations reduced the total length of dendrites in developing hippocampal neurons. Taken together, our results suggest VGF enhances dendritic maturation and that these effects can be altered by common mutations in the VGF gene. The findings may have implications for people suffering from psychiatric disease or other conditions who may have altered VGF levels.Peer reviewe
Electrical Spin Injection and Detection Using Oxide Magnetic Material Fe3O4
No full textSince the proposal of Datta-Das transistor, area of spin injection and detection is in the spotlight for the last decade. Intense research in this field has successfully tackled many issues like conductivity mismatch. Use of tunnel barrier has improved the quality of the signal. Room temperature spin signals measured using all electrical non-local geometry of measurement in materials has made it more popular. Many such demonstrations of spin injection using metallic ferromagnets like Fe, Co and CoFe into Si, GaAs and Ge promises that this technique indeed a powerful tool for many future applications.
In our study, we have used an oxide magnetic material Fe3O4 as the spin injector which has the advantage of half-metallicity for the improved electrical spin injection and detection instead of conventional materials like Fe, Co etc. 3-terminal non-local geometry of electrical measurement is adopted for electrical spin injection throughout the course of study. Spin injection and detection is successfully extended to many systems like GaAs and Si with different doping concentration in an effort to obtain a combination of right material with high spin injection efficiency. Many such systems are compared and indeed the half-metallic Fe3O4 based devices perform better than the systems with conventional materials.
Chapter 1: In this chapter a brief introduction of the area of research is provided along with a summary of earlier studies in the field. From a brief discussion on the existing theory of spin injection and diffusion in various types of materials, we can see that the proper choice of material for any such studies is important. Interface between many systems such as ferromagnet/non-magnet, ferromagnet/insulator/non-magnet are compared and analyzed using existing theories with spin-polarization as a measure. Later on the discussion is extended specifically into semiconductors as our main goal is to study the spin injection and detection into semiconducting materials. A brief discussion on the criteria and importance of the materials chosen for our study is also presented.
Chapter 2: This chapter provides a brief introduction to half-metallic Fe3O4 and its crystal structure from the magnetism point of view. An introduction to the experimental techniques used during the course of the study is also provided at the second half of the chapter.
Chapter 3: Optimization of Fe3O4 thin film growth on different substrates is mainly discussed in this chapter. Based on the choice of substrates, growth of Fe3O4 can be tuned from a single crystal to polycrystalline thin film. In the presence of MgO insertion layer, Fe3O4 growth is found to be always (100) oriented single crystalline on GaAs, whereas only (111) oriented growth of Fe3O4 is present in the absence of MgO. Similarly growth and the subsequent basic structural and magnetization characterization are presented for Fe3O4 on Si and MgO/Si. Interestingly, magnetization measurements on Fe3O4 on different substrates show an exchange bias (EB) in a single magnetic film at temperatures less than 200 K. Several temperatures dependent hysteresis together with the training effect of the samples show that the observed EB has a similar exchange pinning behavior found at the ferromagnet-antiferromagnet bi-layers. Nature of EB is found to be highly directional and the magnitude of the coupling varies at different directions with respect to the crystallographic axis of Fe3O4 grown on various substrates. A possible reason for the observation of EB in a single magnetic layer is proposed based on the formation defects at regular sites in the thin film lattice. These defects are formed during the high energy PLD growth process which alters the regular local magnetic interactions of the lattice sites. If this interaction strength is high enough to influence the total magnetization of the material, then EB can set into this system together with the low temperature magnetic anisotropy variation.
Chapter 4: This chapter furnishes the details of the optimization of the tunnel junctions for the 3-terminal non-local geometry of electrical Hanle measurement on Fe3O4/MgO/GaAs. Successful observations of room temperature electrical spin injection and detection are demonstrated on different devices with varying injection current. Hanle measurements at different low temperature show a systematic variation of spin relaxation in n-type of GaAs. Similar room temperature studies are extended to p-type GaAs, where the observation of spin signal is otherwise difficult at room temperatures. Variation of MgO barrier thickness is shown to be having no effect on the observed spin signal, which in turn avoids the ambiguity of any spurious unwanted effects from the junction region.
Chapter 5: Observation of electrical spin injection and detection in various systems are discussed in this chapter. Similar to GaAs, Hanle measurements in Fe3O4/MgO/n-type Si as well as p-type Si is carried out with the drop of spin accumulation by at least 2 orders of magnitude. The presence and the absence of MgO in Fe3O4/MgO/n-type GaAs have an impact on the magnitude of spin accumulation. Interestingly we have observed a huge enhancement of spin accumulation at T ~120K in all devices with Fe3O4 as a spin injector irrespective of the substrates. Hence the Verwey transition of Fe3O4 has an enormous influence on the spin accumulation at any substrate. Origin of the huge enhancement of the accumulation is consistent with the temperature dependence of spin-polarization of Fe3O4. From our study, we have found out that all these Fe3O4 based devices on GaAs found to be superior to the usual Fe/MgO/GaAs devices.
Chapter 6: This chapter gives a broad summary of all the studies carried out during the tenure of work. It also discusses the importance and the impact of the work in the field of semiconductor spintronics devices. Future of the extension of this work looks very promising as these devices can be directly used for the realization of spin-transistors
Fabrication of nanoadjuvant with poly-ɛ-caprolactone (PCL) for developing a single-shot vaccine providing prolonged immunity [Corrigendum]
No full textPrashant CK, Bhat M, Srivastava SK, et al. Int J Nanomedicine. 2014;9:937–950.On page 937, the author affiliations have been listed incorrectly. The correct author list is as follows:Chandravilas Keshvan Prashant1Madhusudan Bhat2Sandeep Kumar Srivastava2Ankit Saxena3Manoj Kumar4Amar Singh3Mohammed Samim5Farhan Jalees Ahmad6Amit Kumar Dinda21Faculty of Engineering and Interdisciplinary Sciences, Jamia Hamdard, New Delhi, India; 2Department of Pathology, 3Department of Transplant Immunology and Immunogenetics, All India Institute of Medical Sciences, New Delhi, India; 4Centre for Biomedical Engineering, Indian Institute of Technology, New Delhi, India; 5Department of Chemistry, Faculty of Science, Jamia Hamdard, New Delhi, India; 6Department of Pharmaceutics, Faculty of Pharmacy, Jamia Hamdard, New Delhi, IndiaRead the original articl
Evaluation of the DPPH radical scavenging activity of Kadaliphala (Musa paradisiaca. Linn) and Go-Ksheera (Cow milk) W.S.R. to the concept of Samyoga Viruddha
No full textCertain diets and their combinations have properties opposite to the tissues of the body which thereby inhibit and interrupt their normalcy and these are described as Viruddha Ahara (incompatible diets) in Ayurveda. Various types of Viruddha Ahara have been described in the classical texts of Ayurveda and Samyoga Viruddha (incompatability due to the combination) is one among them. Among the various examples quoted for samyoga viruddha, combination of kadaliphala (Musa paradisiaca. Linn) and Go-Ksheera (Cow milk) is one. The present study discusses the DPPH radical scavenging activity of the individual items and the combination of banana and milk. Materials and methods: The antioxidant activities of banana, milk and combination of banana and milk was determined by DPPH (1,1-diphenyl-2-picrylhydrazine) radical scavenging assay in comparison with vitamin C standard. Results: The Percentage inhibition of the discoloration of DPPH by the sample extract was expressed against vitamin C standard. The % inhibition of banana was 62.86 whereas the milk was having 69.01% inhibition. The % inhibition of the combination was 46.21. Conclusion: DPPH radical scavenging activity of combination of kadaliphala (banana) and Go-Ksheera (milk) found a significant decrease in the percentage of inhibition when compared to the individual sample indicating towards the incompatibility in their combination or Samyoga Viruddha
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