ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Electronic Resource

Food habits, gut morphology and pH, and assimilation efficiency of the zebraperch Hermosilla azurea, an herbivorous kyphosid fish of temperate marine waters (1998)

Sturm, E. A. ; Horn, M. H.

Springer

Marine biology 132 (1998), S. 515-522

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ISSN: 1432-1793

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Adult zebraperch, Hermosilla azurea, were found to be functional herbivores in that animal matter constituted 〈0.01% of the total dry weight of stomach contents of fish collected off Santa Catalina Island in southern California waters. The diet of these fish consisted mainly of red algae (88.2% by dry wt) and also small amounts of brown (7.8%) and green (4.0%) algae. The most important dietary item, the filamentous red algae Polysiphonia spp., was found in 〉78% of the stomachs and comprised 〉60% of the contents by dry weight. The digestive tract was long, on average 4.0 times the standard length of the fish, and was composed of the stomach, pyloric caeca, intestine, hindgut chamber with a blind caecum, and rectum. The mean pH of the cardiac stomach was acidic (3.9), whereas that of the intestine was nearly neutral (6.9) and that of the hindgut and blind caecum slightly acidic (6.3 and 6.6, respectively). Algal foods are apparently digested by acid lysis in the stomach and by microbial fermentation in the hindgut. Zebraperch assimilated nutritional constituents from six species of algae with varying degrees of efficiency: carbon (73.7 to 89.7%), nitrogen (72.4 to 84.5%), and protein (71.9 to 94.9%). The fish assimilated these constituents as efficiently or more efficiently from three species of nondietary brown algae as from three species of dietary red and green algae. These results show that zebraperch, like their tropical and subtropical relatives (members of the genus Kyphosus), can digest a wide variety of algae including brown algae containing defensive secondary compounds.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002270050417

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2

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A microsystem design process (1995)

Holmer, R. ; Horn, M. ; Ullmann, R. ; [et al.]

Springer

Microsystem technologies 1 (1995), S. 68-70

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ISSN: 1432-1858

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Technology

Notes: Abstract The design of microsystems is, because of the enormous variety of possible components and materials, and therefore of very high complexity within the whole system, a problem, that can only be solved with a continuous design concept [1] [2] [3]. The structure and the contents of such a concept must fit to a scope of application as wide as possible. On the one hand a strongly specialized form of a design concept, as in the microelectronics field, is not possible or useful here, on the other hand a much too generalized concept will bring problems in the practical application. The following contribution tries to show a possible solution for this very complex problem. In form of a design-flow-diagram there is given a step-by-step description of the various points, that are necessary for a microsystem design process. As a result, a complete concept, is shown that leads the designer from the customer's demands through the fictive microsystem to the pilot series.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01624465

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3

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Applications of ICP-MS in semiconductor industry (1999)

Horn, M.

Springer

Fresenius' journal of analytical chemistry 364 (1999), S. 385-390

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ISSN: 1432-1130

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Contamination in semiconductor industry is a very serious drawback during the production of integrated circuits. Connected with the ongoing miniaturization smaller and smaller amounts of metal contamination can effect the integrated circuits. Because of the outstanding detection limits ICP-MS is widely spread in semiconductor industry. The main applications are metal and semi-metal analysis in deionized water, chemicals and on the wafer surface. The challenges in semiconductor industry are the required detection limits, which are mainly limited by contamination during sample treatment and the background of the instruments.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s002160051355

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4

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Structure of the CCCN and CCCCH radicals: Isotopic substitution and ab initio theory (1995)

McCarthy, M. C. ; Gottlieb, C. A. ; Thaddeus, P. ; [et al.]

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 103 (1995), S. 7820-7827

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: The millimeter-wave rotational spectra of the 13C isotopic species of the CCCCH and CCCN radicals and CCC15N were measured and the rotational, centrifugal distortion, and spin-rotation constants determined, as previously done for the normal isotopic species [Gottlieb et al., Astrophys. J. 275, 916 (1983)]. Substitution (rs) structures were determined for both radicals. For CCCN, an equilibrium structure derived by converting the experimental rotational constants to equilibrium constants using vibration–rotation coupling constants calculated ab initio was compared with a large-scale coupled cluster RCCSD(T) calculation. The calculated vibration–rotation coupling constants and vibrational frequencies should aid future investigations of vibrationally excited CCCN. Less extensive RCCSD(T) calculations are reported here for CCCCH. The equilibrium geometries, excitation energies (Te), and dipole moments of the A2Π excited electronic state in CCCN and CCCCH were also calculated. We estimate that Te=2400±50 cm−1 in CCCN, but in CCCCH the excitation energy is very small (Te=100±50 cm−1). Owing to a large Fermi contact interaction at the terminal carbon, hyperfine structure was resolved in 13CCCCH. Measurements of the fundamental N=0→1 rotational transition of CCCCH with a Fourier transform spectrometer described in the accompanying paper by Chen et al., yielded precise values of the Fermi contact and dipole–dipole hyperfine coupling constants in all four 13C species. The Fermi contact interaction is approximately two times larger in CCCN, allowing a preliminary estimation of hyperfine coupling constant bF in 13CCCN and C13CCN from the millimeter-wave rotational spectra. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.470198

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5

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Torsional motion and vibrational overtone spectroscopy of methanol (1999)

Hänninen, V. ; Horn, M. ; Halonen, L.

College Park, Md. : American Institute of Physics (AIP)

The Journal of Chemical Physics 111 (1999), S. 3018-3026

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ISSN: 1089-7690

Source: AIP Digital Archive

Topics: Physics , Chemistry and Pharmacology

Notes: An internal coordinate Hamiltonian model has been constructed to model torsional motion in the OH stretching vibrational overtone region of methanol, CH3OH. The model includes harmonic couplings between OH and CH stretching vibrations and Fermi resonance interactions between OH stretches and COH bends and between CH stretches and CH2 bends. A symmetrized basis set has been used to form block diagonal Hamiltonian matrices with strong resonance couplings off-diagonal. Observed torsional levels of the excited vibrational states have been used as data in a least squares optimization of the model parameters, some of which have been estimated by ab initio calculations. The experimentally observed increase in the effective torsional barrier in moving to highly excited OH stretching states has been explained by the model. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.479583

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6

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Global stabilization of a dynamic von Kármán plate with nonlinear boundary feedback (1995)

Horn, M. A. ; Lasiecka, I.

Springer

Applied mathematics & optimization 31 (1995), S. 57-84

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ISSN: 1432-0606

Keywords: Stabilization ; Nonlinear boundary feedback ; von Kármán plate ; Robustness ; 35 ; 49

Source: Springer Online Journal Archives 1860-2000

Topics: Mathematics

Notes: Abstract We consider a fully nonlinear von Kármán system with, in addition to the nonlinearity which appears in the equation, nonlinear feedback controls acting through the boundary as moments and torques. Under the assumptions that the nonlinear controls are continuous, monotone, and satisfy appropriate growth conditions (however, no growth conditions are imposed at the origin), uniform decay rates for the solution are established. In this fully nonlinear case, we do not have, in general, smooth solutions even if the initial data are assumed to be very regular. However, rigorous derivation of the estimates needed to solve the stabilization problem requires a certain amount of regularity of the solutions which is not guaranteed. To deal with this problem, we introduce a regularization/approximation procedure which leads to an “approximating” problem for which partial differential equation calculus can be rigorously justified. Passage to the limit on the approximation reconstructs the estimates needed for the original nonlinear problem.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01182557

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7

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The stereochemistry of some new chiral brominated compounds with a 2,4,8,10-tetraoxaspiro[5.5]undecanic skeleton (1995)

Grosu, I. ; Mager, S. ; Plé, G. ; [et al.]

Springer

Monatshefte für Chemie 126 (1995), S. 1021-1030

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ISSN: 1434-4475

Keywords: Axial and helical chirality ; Conformational analysis ; Diastereotopicity of protons and carbon atoms ; Regioselective bromination reaction ; Spiro 1,3-dioxanes

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Zusammenfassung Mittels einer regioselektiven radikalischen Bromierungsreaktion wurden neue bromsubstituierte Verbindungen mit einem 2,4,8,10-Tetraoxaspiro[5.5]undecan — Gerüst synthetisiert. Die Stereochemie der Verbindungen wurde mit Hilfe hochauflösender Kernresonanzspektroskopie untersucht. Die Chiralität des Spiranskeletts wird im Zusammenhang mit der Diastereotopie von Wasserstoff- und Kohlenstoffatomen diskutiert.

Notes: Summary New compounds containing the 2,4,8,10-tetraoxaspiro[5.5]undecanic skeleton, substituted with brominated groups, have been synthesized by a regioselective radicalic bromination reaction. The stereochemistry of the compounds was studied by high resolution NMR methods. The anancomericity or the flipping of the rings was inferred from the conformational analysis. The chirality of the spiranic skeleton was investigated by means of the diastereotopicity of hydrogen and carbon atoms.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00811022

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8

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Calculated vibrational structure of the first band of the photoelectron spectrum of HO 2 − and the electron affinity of HO2 (1996)

Horn, M. ; Seeger, S. ; Oswald, R. ; [et al.]

Springer

The European physical journal 36 (1996), S. 293-299

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ISSN: 1434-6079

Keywords: 31.25.Qm ; 33.15.Ry ; 33.60.Cv

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The vibrational structure of the first band of the photoelectron (PE) spectrum of HO 2 − and DO 2 − has been calculated on the basis of (slightly modified) ab initio potentials. The best agreement with the experimental spectrum of HO 2 − is obtained for a vibrational temperature of ca. 600 K. “Peak D”, which has been under debate in earlier work, is composed of two transitions, with the “hot” transition 3 1 1 being more intense than the adiabatic transition. Since thev 2 bending mode of DO2 has significant OO stretching character, the vibrational structure of the PE spectrum of DO 2 − is more complex than that of HO 2 − . Large-scale RCCSD(T) calculations of the equilibrium electron affinity of HO2 yield 1.058 eV which agrees with the experimental value of 1.044 ± 0.020 eV.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01426415

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