6,165 research outputs found
HPLC and GC-MS analyses of phytochemicals from Ficus carica leaf extract and essential oil along with their antimicrobial properties
No full textFicus carica L. (Common Fig) is one of the oldest shrubs useful to mankind, belonging to the Moraceae family. It offers nutritional and medical benefits as a source of potentially bioactive chemicals. This work used fig leaves to obtain acetone extract (ACE) and essential oil (EO). The ACE and the EO were evaluated for antibacterial activity against bacterial wilt and soft rot of potato caused by Ralstonia solanacearum LN827661 and Pectobacterium carotovorum LN851554, respectively, and evaluated for antifungal activity against cucumber grey mold fungi caused by Botrytis cinerea PP758474 and early blight of tomato caused by Alternaria alternata PP737871. The chemical compounds in the ACE were analyzed using gas chromatography-mass spectrometry (GC-MS) and highperformance liquid chromatography (HPLC-DAD (diode-array detector)), while the GC-MS was used to analyze the chemical compounds in the EO. The main phenolic compounds in the ACE were p-coumaric acid (13.63 mu g/ mL), ferulic acid (12.63 mu g/mL), and caffeic acid (10.42 mu g/mL), and the main flavonoid compounds were naringin (15.45 mu g/mL), rutin (8.60 mu g/mL), and luteolin (7.48 mu g/mL). The main compounds in the ACE from F. carica leaves by GC-MS were bergapten (22.10 %), linolenic acid (19.47 %), 2,8-diiododibenzofuran (5.77 %), and ficusin (5.56 %). The abundant compounds in the EO were versalide (12.88 %), isopropyl myristate (12.68 %), a-hexyl cinnamaldehyde (4.65 %), lilial (4.33 %), and tetradecane (4.04 %). The EO at 2000 mu L/mL exhibited the maximum activity against P. carotovorum with an inhibition zone (IZ) value of 15.66 mm. This was followed by the ACE at 2000 mu g/mL with IZ value of 14.66 mm. The highest activity against the growth of R. solanacearum was found by the EO (2000 mu L/mL) and the ACE (2000 mu g/mL) with IZ values of 16.66 mm and 15.33 mm, respectively. The EO at 2000 mu L/mL and 1000 mu L/mL showed the highest fungal inhibition percentage (FIP) against A. alternata growth, with values of 47.46 % and 38.83 %, respectively. Concerning B. cinerea growth, the EO recorded the highest FIP values of 56.33 and 52.93 % at 2000 and 1000 mu L/mL, respectively. This work highlights the potential of side stream valorization from fig production to obtain safe and sustainable antimicrobial agents for crop protection, amongst them potatoes, tomatoes, and cucumber
THE PRESSURE BROADENING THEORY OF
No full textThis work was supported by the U. S. Air Force, through the Office of Scientific Research of the Air Research and Development Command. P. W. Anderson, Phys. Rev. 76:647 (1949) Ralph Trambarulo, Henry Lackner, Paul Moser, and Harold Feeny, Bull. Am. Phys. Soc. 29:34 (1954)Author Institution: Department of Physics, University of DelawareThe pressure broadening theory of P. W. is applied to the self broadening of BrCN. The large collision diameter for the to transition could not be obtained by the pure first-order dipole-dipole resonance interaction considered by Anderson. By extending the calculations to include all possible first-order dipole-dipole interactions, it is possible to obtain good agreement between the theoretical and experimental collision diameters. (At a temperature of the theoretical collision diameter is compared to the experimental collision diameter of .) The nonresonant dipole-dipole interactions play an important role because of the comparatively large populations of the higher J states. Second-order dipole-dipole interactions increase the theoretical collision diameter slightly. It also appears possible to explain the temperature dependence of the collision diameter and the J dependence of the collision diameter on the basis of these calculations
COMMERCIAL 584\AA PHOTOELECTRON SPECTROMETER
No full textAuthor Institution: Perkin-Elmer LimitedThe design of a commercial 584\AA Photcelectron Spectrometer will be discussed together with some recent research problems investigated by this technique
Open Access to Peer-Reviewed Research through Author/Institution Self-Archiving: Maximizing Research Impact by Maximizing Online Access
No full textAll refereed journals will soon be available online; most of them already are. This means that anyone will be able to access them from any networked desk-top. The literature will all be interconnected by citation, author, and keyword/subject links, allowing for unheard-of power and ease of access and navigability. Successive drafts of pre-refereeing preprints will be linked to the official refereed draft, as well as to any subsequent corrections, revisions, updates, comments, responses, and underlying empirical databases, all enhancing the self-correctiveness, interactivity and productivity of scholarly and scientific research and communication in remarkable new ways. New scientometric indicators of digital impact are also emerging <http://opcit.eprints.org> to chart the online course of knowledge. But there is still one last frontier to cross before science reaches the optimal and the inevitable: Just as there is no longer any need for research or researchers to be constrained by the access-blocking restrictions of paper distribution, there is no longer any need to be constrained by the impact-blocking financial fire-walls of Subscription/Site-License/Pay-Per-View (S/L/P) tolls for this give-away literature. Its author/researchers have always donated their research reports for free (and its referee/researchers have refereed for free), with the sole goal of maximizing their impact on subsequent research (by accessing the eyes and minds of fellow-researchers, present and future) and hence on society. Generic (OAi-compliant) software is now available free so that institutions can immediately create Eprint Archives in which their authors can self-archive all their refereed papers for free for all forever <http://www.eprints.org/>. These interoperable Open Archives <http://www.openarchives.org> will then be harvested into global, jointly searchable "virtual archives" (e.g., <http://arc.cs.odu.edu/>). "Scholarly Skywriting" in this PostGutenberg Galaxy will be dramatically (and measurably) more interactive and productive, spawning its own new digital metrics of productivity and impact, allowing for an online "embryology of knowledge.
Author attribution using profile classifiers
No full textA atribuição autoral (AA) busca identificar um autor de texto a partir de um conjunto de autores conhecidos. Autores deixam rastros em seus textos e é possível identificar características sociolinguísticas baseadas no estilos de escrita refletidos no texto destes autores. A atribuição autoral está cada vez mais demonstrando importância para diversas atividades sociais, em especial para a análise forense. Os trabalhos envolvendo AA demonstram resultados modestos e motivam a exploração de diferentes técnicas para melhorar a acurácia dos modelos atuais. A partir desses pontos, o presente trabalho apresenta uma proposta de pesquisa em nível de mestrado no campo de processamento de língua natural (PLN), com ênfase em AA, com o objetivo geral de melhorar o desempenho de classificadores de atribuição autoral utilizando técnicas de caracterização autoral (CA)Author attribution (AA) seeks to identify a text author from a set of known authors. Authors leave traces in their texts and it is possible to identify sociolinguistic characteristics based on the writing styles reflected in the text of these authors. Author attribution is increasingly showing importance for various social activities, especially forensic analysis. Studies involving AA show modest results and motivate the exploration of different techniques to improve the accuracy of current models. From these perspective, this project presents a master\'s level research proposal in the field of natural language processing (NLP), with an emphasis in AA, with the general objective of improving the performance of AA classifiers using author profiling technique
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Observations of the 57Fe+23 hyperfine transition in clusters of galaxies
No full textWe present a search for the hyperfine transition of the 57Fe+23 ion at 3.071 mm in clusters of galaxies with the ATNF Mopra telescope. The results are compared with a realistic estimate of the peak brightness temperature of the line in a cooling flow cluster A85, using the available X-ray data
THE ANALYSIS OF FIVE ELECTRONIC EMISSION SYSTEMS OF NIOBIUM NITRIDE (NbN) IN THE REGION 5000{\AA} – 6200{\AA}
No full textK. H. Rao and T. M. Dunn, Nature 222, 266 (1969). J. L. Femenias, C. Athenour, and T. M. Dunn, J. Chem. Phys. 63, 2861 (1975).Author Institution:Niobium nitride emission systems have been found at 5l37{\AA}, 5582{\AA}, 5740{\AA}, 5840{\AA}, 5860{\AA}, in addition to the already systems with subbands at 5930{\AA}, 6043{\AA}, and 6192{\AA}. Most of These systems show marked nuclear hyperfine structure of the rotational lines add this has been of assistance in the analysis of all of the systems. Systems of triplet-triplet, singlet-singlet and singlet-triplet are all present and the hyperfine structure also allows assignment of the ground and excited state electron configuration to be made with some confidence
THE 4550 {\AA} BAND SYSTEM OF GLYOXAL
No full textAuthor Institution: Division of Pure Physics, National Research Council“Approximately 45 bands of glyoxal in the region 4000-4660 {\AA} have been photographed in absorption using a 30 ft. Ebert spectrograph with a resolving power of and a dispersion of 1.3 {\AA}/cm. The (0-0) baud near 4550 {\AA}, which WAS studied at a temperature of C, shows fairly well-resolved J- and K- structure characteristic of a perpendicular hand of a near symmetric top molecule. The rotational and vibrational analysis of the speetrum will be discussed.
THE ABSORPTION SPECTRUM OF SODIUM VAPOR FROM 1040{\AA} TO 3500 {\AA}
No full textR. W. Ditchburn and R. D. Hudson, Proc, Roy. SOC. A256, 53 (1960). R. W. Ditchburn, P. J. Jutsum and G. V. Marr, Proc. Roy. Soc. A219, 89 (1953).Author Institution: Space Physics Laboratory, Aerospace Corporation“The absorption of ultraviolet radiation by sodium vapor, and the associated ionization, has been investigated from 1040{\AA} to 3500{\AA} using a two-metre McPherson normal incidence spectrometer and an absorption chamfer of the type described by Ditchburn and The atomic cross section at the series limit (2412 {\AA}) was found to be , in good agreement with the previous result obtained by Ditchburn, Jutsum and The atomic cross section decreases to a minimum at 1900{\AA} and then increases again towards shorter wavelengths. Continuous molecular absorption was observed from 3500{\AA} to 1700{\AA} and ion chamber measurement indicate that this absorption is due to an ionization continuum. Ion current peaks were also seen between 2413{\AA} and 3500{\AA} at wavelengths corresponding to the series absorption lines of the sodium atom. Curves will be presented showing the variation with wavelength of both the atomic cross section and the relative molecular cross section.
ROTATIONAL ANALYSIS OF THE 6125 {\AA} REGION OF NITROGEN DIOXIDE
No full textAuthor Institution: Department of Chemistry, Columbia University; Laboratoire de Photophysique, Moleculaire C.N.R.S. University of Paris-Sud; Department of Chemistry, Columbia UniversityFrom an analysts of the rotationally resolved fluorescence of excited by a narrow band (0.03 {\AA}) tunable dye laser, quantum numbers have been assigned to 80 transitions in the 6l25 {\AA} region. Three band origins are observed in a 20 {\AA} interval, two of which have also been seen in a nozzle beam seeded with A rotational analysis of the 6125 {\AA} and 6127 {\AA} bands is reported, while the small number of transitions assigned to the 6117 {\AA} band presently prevents analysis. Under collision-free conditions ( mTorr) the ``average” radiative lifetimes of the 6117 {\AA} band and the 6125 {\AA} band are sec and sec, respectively. Comments are made concerning the vibrational overlap in this region
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