OALib Journal期刊

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Biosynthesis of Copper Nanoparticles and Their Antimicrobial Activity  [PDF]
Parth Parikh, Dipali Zala, Bharat A. Makwana
Open Access Library PrePrints (OALib PrePrints) , 2014, DOI: 10.4236/oalib.preprints.1200067
Abstract:

Development of green nanotechnology is generating interest of researchers toward ecofriendly biosynthesis of nanoparticles. Biomolecules present in plant extracts can be used to reduce metal ions to nanoparticles in a single-step green synthesis process. This biogenic reduction of metal ion to base metal is quite rapid, readily conducted at room temperature and pressure, and easily scaled up. In this study, biosynthesis of stable copper nanoparticles were done using datura meta leaf extract. These biosynthesized Cu nanoparticles? were characterized by UV/Vis-spectroscopy, Particle size analyzer (PSA), Transmission electron mictroscopy (TEM), Energy dispersive X-ray Analysis (EDX),Fourier transform infrared spectroscopy (FTIR). It was observed that the datura meta leaf extract can reduce copper ions into copper nanoparticles within 8 to 10 min of reaction time. Thus, this method can be used for rapid and ecofriendly biosynthesis of stable copper nanoparticles.Synthesis mediated by plant extracts is environmentally benign. The reducing agents involved include the various water soluble plant metabolites (e.g. alkaloids, phenolic compounds, terpenoids) and co-enzymes. Extracts of a diverse range of plant species have been successfully used in making nanoparticles. In addition to plant extracts, live plants can be used for the synthesis. It was found that copper nanoparticles were also found to exhibit reasonably good antimicrobial activity when compared with standard Chloramphenicol, which suggests its potential use as antimicrobial agent. Hence, there is scope to develop new methods for the synthesis of nanoparticles which should be required inexpensive reagent, less drastic reaction condition and eco-friendly.?

Nuclear modification and elliptic flow measurements for $φ$ mesons at $\sqrt{s_{NN}}$ = 200 GeV d+Au and Au+Au collisions by PHENIX
Dipali Pal
Physics , 2005, DOI: 10.1016/j.nuclphysa.2006.06.072
Abstract: We report the first results of the nuclear modification factors and elliptic flow of the phi mesons measured by the PHENIX experiment at RHIC in high luminosity Au+Au collisions at sqrt(sNN) = 200 GeV. The nuclear modification factors R_AA and R_CP of the phi follow the same trend of suppression as pi0's in Au+Au collisions. In d+Au collisions at sqrt(sNN) = 200 GeV, the phi mesons are not suppressed. The elliptic flow of the phi mesons, measured in the minimum bias Au+Au events, is statistically consistent with other identified particles.
$φ$ meson production in d + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
Dipali Pal
Physics , 2004, DOI: 10.1088/0954-3899/31/4/026
Abstract: We present the preliminary results on $\phi$ meson production in the $\phi \to K^{+}K^{-}$ and $\phi \to e^{+}e^{-}$ decay channels measured at mid-rapidity in $\sqrt{s}$ = 200 GeV d + Au collisions at RHIC by the PHENIX experiment. The transverse mass spectra were obtained in both channels. The extracted $\phi$ yields are found to be consistent with each other. The results are compared to the measurements in Au + Au collisions at the same center of mass energy.
Alterations in Heart Rate and Atria to Ventricular Conductivity in Third Trimester Pregnancy: A Comparative Study  [PDF]
Sonam Chaudhary, C. G. Saha, Dipali Sarkar
Advances in Reproductive Sciences (ARSci) , 2015, DOI: 10.4236/arsci.2015.34009
Abstract: The cardiovascular system undergoes physiological changes during pregnancy. These physiological changes in the heart can be understood by simple procedures like electrocardiography. With the objective of formulating basis of alterations in heart rate and impulse conductivity from atria to ventricles during pregnancy, the study was carried out in Manipal Teaching Hospital, Pokhara, Nepal between calendar year 2012 and 2013 by comparing electrocardiograms between pregnant and non-pregnant participants. The total number of participants in this study was 120: 50% was third trimester pregnant women as cases and the other 50% was non-pregnant women as controls. The statistically significant increase in heart rate and highly significant decrease in PR interval in electrocardiograms of cases conclude that the alterations in cardiac function do occur in pregnancies which all try to meet the growing demands of developing fetus. Thus, these changes neither should be misinterpreted as of pathological origin nor the latter one if present should be misdiagnosed by any health care providers.
Diasporic grief and grievance on-line: how South African and Serbian diasporas use the web
Eric Louw,Zala Volcic
Global Media Journal : African Edition , 2011, DOI: 10.5789/4-1-9
Abstract: This paper explores the political and psychological angles of white South African and Serbian diasporas' discourses on-line. On the basis of textual analysis of diasporic web-sites we aregue that participants speak of ongoing grievance over the loss of their countries and assert that they have been the victims of "unjust" history and globalisation. Each online discourse articulates claims of belonging not on the grounds of, for example, citizenship or multiculturalism, but rather on the basis of "a victim-hood", "civilisation", and "grief".
Ultrametric Matrices and Representation Theory
P. Bantay,G. Zala
Mathematics , 1997, DOI: 10.1088/0305-4470/30/19/019
Abstract: The consequences of replica-symmetry breaking on the structure of ultrametric matrices appearing in the theory of disordered systems is investigated with the help of representation theory, and the results are compared with those obtained by Temesvari, De Dominicis and Kondor.
Comparative study of Techniques used for Detection of Selfish Nodes in Mobile Ad hoc Networks
Dipali Koshti,Supriya Kamoji
International Journal of Soft Computing & Engineering , 2011,
Abstract: A MANET (Mobile Ad-hoc Network) is a selfconfiguring system of mobile nodes connected by wireless links.MANETs are self-configuring and decentralized without havinga fix infrastructure. In such a network each node acts as an endsystemas well as a relay node (or router). Most of the routingalgorithms designed for MANET such as AODV and DSR arebased on the assumption that every node forwards every packet.But in practice some of the nodes may act as the selfish nodes.These nodes use the network and its services but they do notcooperate with other nodes. Such selfish nodes do not consumeany energy such as CPU power, battery and also bandwidth forretransmitting the data of other nodes and they reserve them onlyfor themselves. The original AODV and DSR routing algorithmscan be modified to detect such selfish nodes. This paper discussestwo techniques namely Reputation based technique and Creditbased technique used to detect selfish nodes in MANET. Thispaper discusses two algorithms that are based on reputationbased technique and one algorithm based on credit basedtechnique. Finally all three techniques have been compared.
Wideband Sierpinski Carpet Fractal Shaped Cylindrical Dielectric Resonator Antenna for X-Band Application  [PDF]
Dipali Soren, Rowdra Ghatak, Rabindra Kishore Mishra, Dipak Ranjan Poddar
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2012, DOI: 10.4236/jemaa.2012.41002
Abstract: In this paper, a wideband Sierpinski carpet patterned cylindrical Dielectric Resonator Antenna (DRA) operating in the X-Band is proposed. This DRA is realized from low cost Teflon. An impedance bandwidth of 50% is obtained cove- ring the entire X-band with similar radiation pattern throughout the band. The average peak gain within the band is about 5.5 dBi.
Exact asymptotics of the current in boundary dissipated quantum chains in large external fields
Zala Lenar?i?,Toma? Prosen
Physics , 2015, DOI: 10.1103/PhysRevE.91.030103
Abstract: Boundary driven quantum master equation for a general inhomogeneous (non-integrable) anisotropic Heisenberg spin $1/2$ chain, or an equivalent nearest neighbor interacting spinless fermion chain, is considered in the presence of a strong external field $f$. We present an exact closed form expression for large $f$ asymptotics of the current in the presence of pure incoherent source and sink dissipation at the boundaries. In application we demonstrate arbitrary large current rectification in the presence of interaction.
Epigenetic Reactivation of Estrogen Receptor: Promising Tools for Restoring Response to Endocrine Therapy
Neeraj K Saxena,Dipali Sharma
Molecular and Cellular Pharmacology , 2010,
Abstract: Breast tumors expressing estrogen receptor alpha (ER) respond well to therapeutic strategies using SERMs (selective estrogen receptor modulators) such as tamoxifen. However, about thirty percent of invasive breast cancers are hormone independent because they lack ER expression due to hypermethylation of ER promoter. Treatment of ER negative breast cancer cells with demethylating agents and histone deacetylase inhibitors leads to expression of ER mRNA and functional protein. Additionally, growth factor signaling pathways have also been implicated in ER silencing in ER-negative tumor phenotype. Recently, important role of components of ubiquitin-proteasome pathway has been shown in mediating downregulation of ER. In this article, we will review various mechanisms underlying the silencing of ER in ER negative tumor phenotype and discuss diverse strategies to combat it. Ongoing studies may provide the mechanistic insight to design therapeutic strategies directed towards epigenetic and non-epigenetic mechanisms in the prevention or treatment of ER-negative breast cancer.
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