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  • Chemistry  (10)
  • salinity stress  (2)
  • 53C05  (1)
  • Bayes estimators  (1)
  • Wiley-Blackwell  (10)
  • Springer  (4)
  • American Chemical Society
  • Hindawi
  • Public Library of Science
  • 1995-1999  (6)
  • 1970-1974  (8)
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  • Wiley-Blackwell  (10)
  • Springer  (4)
  • American Chemical Society
  • Hindawi
  • Public Library of Science
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  • 1
    Digitale Medien
    Digitale Medien
    On Best Equivariance and Admissibility of Simultaneous MLE for Mean Direction Vectors of Several Langevin Distributions (1998)
    Springer
    Annals of the Institute of Statistical Mathematics 50 (1998), S. 715-727 
    Details
    ISSN: 1572-9052
    Schlagwort(e): Admissibility of estimators ; Bayes estimators ; best equivariant estimator ; Langevin distribution ; mean direction vector ; Stein effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The circular normal distribution, CN(μ, κ), plays a role for angular data comparable to that of a normal distribution for linear data. We establish that for the curved and for the regular exponential family situations arising when κ is known, and unknown respectively, the MLE $$\widehat\mu$$ of the mean direction μ is the best equivariant estimator. These results are generalized for the MLE $$\widehat{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } }$$ of the mean direction vector $$\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } = (\mu _1 , \ldots ,\mu _p )'$$ in the simultaneous estimation problem with independent CN(μ $$_i$$ , ϰ), i = 1,..., p, populations. We further observe that $$\widehat{\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } }$$ is admissible both when κ is known or unknown. Thus unlike the normal theory, Stein effect does not hold for the circular normal case. This result is generalized for the simultaneous estimation problem with directional data in q-dimensional hyperspheres following independent Langevin distributions, L( $$L(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\thicksim}$}}{\mu } _i ,\kappa ),i = 1, \ldots ,p$$ .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1003712930390
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  • 2
    Digitale Medien
    Digitale Medien
    A new 2-form for connections on surfaces with boundary (1995)
    Springer
    Letters in mathematical physics 34 (1995), S. 135-147 
    Details
    ISSN: 1573-0530
    Schlagwort(e): 53C05 ; 58D27 ; 81T13
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract A natural gauge-invariant 2-form is introduced on the space of connections over a compact oriented surface with boundary. It is shown that this 2-form descends to the moduli space of flat connections, under a group of based gauge transformations. An explicit expression (in terms of holonomy variations) is given for the resulting 2-form, and it is related to the symplectic structure of the extended moduli space introduced by L. C. Jeffrey.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00739092
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  • 3
    Digitale Medien
    Digitale Medien
    Expression of arginine decarboxylase in seedlings of indica rice (Oryza sativa L.) cultivars as affected by salinity stress (1997)
    Springer
    Plant molecular biology 34 (1997), S. 477-483 
    Details
    ISSN: 1573-5028
    Schlagwort(e): arginine decarboxylase ; gene expression ; Oryza sativa ; polyamines ; rice ; salinity stress
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The effect of salinity stress on the activity of arginine decarboxylase (ADC, EC 4.1.1.19), the first enzyme in biosynthesis of polyamines (PA) from arginine, as well as its transcript level has been compared in salt-sensitive (M-1-48) and salt-tolerant (Pokkali) rice cultivars. Treatment of 72 h grown seedlings either with increasing concentrations of NaCl or with 150 mM NaCl for different time periods, showed a gradual increase of activity in Pokkali. In M-1-48 an immediate increase followed by sharp decrease was observed on prolonged treatment beyond 6 h or above 150 mM NaCl. To generate a DNA probe for ADC, the polymerase chain reaction was used with oat genomic DNA and sequence-specific primers. A region of oat genomic DNA containing a coding sequence for 166 amino acids of the C-terminal part of the ADC enzyme was amplified and called OAD1. Southern analysis of EcoRI- or BamHI-cut genomic DNAs from different cultivars of rice with OAD1 as the probe revealed strong hybridization with one DNA fragment of rice and restriction fragment length polymorphism (RFLP) was noticed. Northern analysis of total RNA of rice with OAD1 as the probe revealed hybridization with a transcript of similar size to the ADC transcript in oat. While in Pokkali, at least a 20-fold accumulation of OAD1 homologous transcript was detected after treatment with 200 mM NaCl, only a seven-fold increase in transcript level was found in M-1-48 after 150 mM NaCl treatment. Results suggest that in the salt-tolerant rice cultivar Pokkali, ADC enzyme activity increases and its transcript also accumulates during the prolonged salinity stress, this mechanism is absent in the salt-sensitive rice cultivar M-1-48 where a prolonged period of salinity stress down-regulates both ADC activity and its transcript level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005802320672
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  • 4
    Digitale Medien
    Digitale Medien
    Expression of abscisic acid-responsive element-binding protein in salt-tolerant indica rice (it Oryza sativa L. cv. Pokkali) (1998)
    Springer
    Plant molecular biology 37 (1998), S. 629-637 
    Details
    ISSN: 1573-5028
    Schlagwort(e): Oryza sativa L. ; rice ; salinity stress ; abscisic acid ; abscisic acid-responsive element ; EmBP-1 ; bZIP factor
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract As the products of abiotic stress and ABA inducible genes are predicted to play an important role in the mechanism of salt tolerance, the expression of transcription factor that recognizes abscisic acid-responsive element (ABRE) is likely to be regulated when plants are exposed to abiotic stress. Northern analysis of total RNA from control and salt-treated 10-day-old Pokkali (salt tolerant) rice plants was performed to find out the level of transcripts homologous to wheat cDNA (GC19) for EmBP-1 (bZIP class factor), a transcription factor that recognizes ABRE. Salinity stress (72 h)-induced accumulation of two transcripts, of 2.0 kb (r2.0) and 1.5 kb (r1.5), in roots was detected. Both transcripts were detectable even after 6 h of salt or abscisic acid treatment, whereas sheath and lamina showed constitutive levels of r1.5 transcript. When 32P-labeled DNA containing ABRE was used in a gel mobility shift assay, a low level of complex formation by binding factor was detected from the nuclear extract of lamina of control rice plants. Quantitative enhancement of complex formation was found with the nuclear extract prepared from the lamina of plants treated with 200 mM NaCl for 26 h over control nuclear extract, suggesting a step of regulation of expression of ABRE-binding protein in response to salinity stress. South-western blot analysis of equal amounts of nuclear proteins of lamina showed binding of 32P-labeled ABRE-DNA with two polypeptides (22–28 kDa) present at constitutive levels in control or NaCl-treated plants. Preincubation of the laminar nuclear extract of control plants, with spermidine or proline at 5 mM concentration showed quantitative enhancement of ABRE binding activity. Kinetics of spermidine stimulation showed gradual increase of complex formation from 5 mM concentration. Similarly, addition of GTP to the control nuclear extract also showed quantitative enhancement of complex formation and heparin was found to inhibit GTP activated complex formation by about 25%. Results may suggest the presence of ABRE binding protein in presynthesized and inactive form in control plants and GTP mediated activation is probably one of the way to regulate the expression of ABRE-binding factor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005934200545
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  • 5
    Digitale Medien
    Digitale Medien
    EXSENSEL - a rule-based approach to selection of sensors for process variables (1996)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 19 (1996), S. 443-447 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A novel expert-system-based method for selection of sensors for process variables is presented. EXSENSEL (expert system based sensor selection) deals with 12 process variables and currently has 94 rules in its knowledge base. Despite its large knowledge base, users have to answer a set of only a few questions regarding a particular process variable, which is selected from a menu of 12 variables. A general description of the chosen process variable can be viewed before invoking the rules. Once a sensor has been selected, a brief write up on that particular sensor is also available on user's request. EXSENSEL is the successor to TRANSELEX, which is a single expert system for selection of transducers in the area of temperature, pressure, and flow measurement.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270190510
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  • 6
    Digitale Medien
    Digitale Medien
    Quantum fluid density functional theory of time-dependent processes (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 69 (1998), S. 279-291 
    Details
    ISSN: 0020-7608
    Schlagwort(e): quantum fluid density functional theory ; quantum theory of motion ; time-dependent processes ; electronegativity ; hardness ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A quantum fluid density functional theory has been developed through an amalgamation of the quantum fluid dynamics and the time-dependent density functional theory. It is used in studying typical time-dependent processes like ion-atom collisions and atom-field interaction. Temporal evolution of chemical reactivity parameters as electronegativity, hardness, entropy, and polarizability is monitored for a He atom in its ground and excited states interacting with an external electric field and an incoming proton. It is observed that these reactivity parameters either remain static or oscillate with the external field in the atom-field interaction case, whereas during the collision process, hardness and entropy maximize and polarizability minimizes for both the electronic states of the atom. The possibility of a quantum theory of motion within the purview of this quantum fluid density functional framework is also explored.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 69: 279-291, 1998
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    On the single-point determination of intrinsic viscosity (1971)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 15 (1971), S. 1599-1605 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: In the present paper we have analytically derived a single-point equation for determining the intrinsic viscosity of a polymer. It is observed that the proposed equation gives a much better agreement with the extrapolated value of [η] over a wide range of concentration for good as well as poor polymer-solvent systems.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1971.070150704
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  • 8
    Digitale Medien
    Digitale Medien
    Monohydroxytrifluoroborates and double fluoroborates (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 379 (1970), S. 106-111 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Es wird die Darstellung von Hydroxotrifluoroboraten von Rb, Cs, (CH3)4N+, Nitron, Ni2+, Ni(py)42+ und Co(NH3)63+ beschrieben. Darüber hinaus wurden neuartige 1 : 1-Doppelsalze aus Tetrafluoro- und Hydroxotrifluoroborat erhalten. Von einigen dieser Salze werden Röntgenpulver- und IR-Daten mitgeteilt.
    Notizen: The preparation of monohydroxotrifluoroborates of rubidium, cesium, tetramethylammonium, nitron, nickel, tetrapyridine nickel and hexammine cobalt(III) is described. Besides, a new series of double salts, comprising one mole tetrafluoroborate and one mole of monohydroxotrifluoroborate of the same cation, are described. The X-ray and IR-spectra of some of these salts are reported.
    Zusätzliches Material: 3 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19703790118
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  • 9
    Digitale Medien
    Digitale Medien
    Oxofluorovanadates(V). III. Dioxotrifluorovanadates (1972)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 390 (1972), S. 61-63 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Die Darstellung der Dioxitrifluorovanadate, MI2 (VO2F3)(M = Na+, NH+4, 1/2Ni2+) und MII(HVO2F3)2· xH2O (M = Cu2+, Ni2+, Co2+) wird beschrieben. Leitfähigkeitsmessungen von K2VO2F3 in verschiedener Konzentration deuten auf eine Dissoziation 2K+-und VO2F2-3-Ionen.
    Notizen: Preparation of the salts of the series dioxotrifluorovanadates, M2I (VO2F3), where M = Na+, NH+4, 1/2Ni2+ and MII(HVO2F3)2· xH2O where M = Cu2+, Ni2+ and Co2+ are described. Molecular conductivity measurement of potassium dioxotrifluorovanadate(V), K2VO2F3, at different dilutions indicates that it dissociates primarily into 2K+ and VO2F2-3 ions.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19723900108
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  • 10
    Digitale Medien
    Digitale Medien
    Oxofluorovanadates(V). II Dioxodifluorovanadates (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 384 (1971), S. 255-259 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Ammonium-, Natrium-, Hexamminkobalt (III) und Åthylendiaminium-dioxofluorovanadat(V), MIVO2F2. wurden dargestellt und durch Röntgenpulveraufnahmen, IR-Spektrum und im Falle des NH4-Salzes-Thermogravimetrie charakterisiert.
    Notizen: The syntheses of ammonium, sodium, hexamminecobalt(III) and ethylene-diamine dioxodifluorovanadate(V), MIVO2F2, are reported. Their x-ray powder diffraction data are different from those of the corresponding tetrafluoroborates and perchlorates. Their infrared spectra have been recorded (700-4000 cm-1), and probable band assignments made. The ammonium dioxodifluorovanadate has been studied through thermogravimetry, and the composition of an intermediate product is discussed from its chemical analysis and infrared spectrum.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19713840310
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