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  • 1995-1999  (422)
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  • 1
    Call number: ILP/M 06.0143
    In: Publication of the International Lithosphere Programme
    In: Tectonophysics
    Type of Medium: Monograph available for loan
    Pages: XVIII, 442 S. : Ill., graph. Darst.
    Series Statement: Publication of the International Lithosphere Programme 337
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The overtone spectroscopy and intramolecular vibrational relaxation dynamics of CH chromophore in the fluoroform molecule is studied by a three-dimensional (3D) time-dependent wave-packet method, and the results are compared with the experiment and with those of a 2D (stretch–bend) wave-packet method. A third mode (CF symmetrical stretch) is included in order to explain the long time dynamics and the combination bands between the CF stretch fundamental and the Fermi polyad frequencies. The comparison with the 2D study is carried out by the use of a full set of dynamical and spectroscopic variables, based on the autocorrelation function of the bright states of each polyad. The spectroscopic variables then follow by Fourier transforming the autocorrelation function, while the dynamical ones emerge via survival probability in the frame of the dynamical statistical ensemble. These include several relaxation times and the number of cells and rates of phase–space exploration. The specific effect of the third mode is monitored by following the reduced dynamics of the system irrespective of the polyad stretch–bend dynamics, through population evolution. Dynamical results clearly reveal the third mode effects at very short and long times. In the last regime, we can observe a great span of different behaviors, depending on how the third mode excited states are involved. This richer variety of dynamical patterns cannot be observed in a two-mode model and justifies the present work. The spectroscopic results of both models are in good agreement with the experimental results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
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    In:  Geophys. J. Int., Luxembourg, EGS-Gauthier-Villars, vol. 139, no. 2, pp. 410-418, pp. L23303
    Publication Date: 1999
    Keywords: Modelling ; Statistical investigations ; SOC ; Seismicity ; GJI
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  • 4
    ISSN: 1573-904X
    Keywords: dynamic differential scanning calorimetry ; thermogravimetric analysis ; methyl methacrylate ; surface area ; graft copolymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. The purpose of this study was to determine the glass transition temperatures of new graft copolymers using Modulated Temperature Differential Scanning Calorimetry (MTDSC), and to assess the differences between starch and cellulosic derivatives of methyl methacrylate and between two different drying methods used in their preparation. Methods. Graft copolymers of methyl methacrylate were synthesized and dried by oven or freeze-drying. Surface area measurements and different thermal analysis techniques (Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TGA) and MTDSC) were used to characterize these copolymers. Results. DSC was not sensitive enough to identify the Tgs of the copolymers, however they were clearly identifiable by MTDSC. Tg values obtained may depend on the method of preparation that also altered their physical characteristics e.g. specific surface area. Cellulose derivatives showed lower Tgs than starch derivatives. The results also depended on the drying method used, thus, freeze dried products had slightly lower Tgs than oven dried products. Conclusions. MTDSC represents a useful thermal technique that allows the identification of glass transitions in these new copolymers with higher sensitivity and resolution than conventional DSC, separating the transition from overlapping phenomena such as decomposition or dehydration. The Tg of this new class of copolymers appeared to be dependent on polymer composition and drying method used.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-9686
    Keywords: Ocular convergence ; Response dynamics ; Neural control ; Main sequence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Classically, the primary tool for quantifying the dynamics of vergence and other eye movements has been the main sequence. The main sequence is a plot of peak velocity versus response amplitude and is particularly useful for comparing the dynamics of a large number of eye movements over a range of response amplitudes. However, the main sequence represents only the equivalent first-order behavior of a response and does not describe its dynamics in detail. Since the main sequence is based on only two points on the dynamic trajectory, it is sensitive to measurement artifacts and noise. A new methodology is presented which quantifies the equivalent second-order dynamics of eye movements using a larger region of the transient response. These new indexes were applied to vergence eye movements and were found to differentiate between subtle, but important differences in movement dynamics. © 1999 Biomedical Engineering Society. PAC99: 4266Ew, 8719St
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  • 6
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The resolution of ternary mixtures of salicylic, salicyluric and gentisic acids has been accomplished by partial least squares (PLS) and principal component regression (PCR) multivariate calibration. The total luminescence information of the compounds has been used to optimize the spectral data set to perform the calibration. A comparison between the predictive ability of the three multivariate calibration methods, PLS-1, PLS-2 and PCR, on three spectral data sets, excitation, emission and synchronous spectra, has been performed. The excitation spectrum has been the best scanning path for salicylic and salicyluric acid determinations, while the emission spectrum has been the best for the gentisic acid determination. The convenience of analysing the total luminescence spectrum information when using multivariate calibration methods on fluorescence data is demonstrated.
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  • 7
    ISSN: 1573-5176
    Keywords: succession ; periphyton ; atrzine toxicity ; stream
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study was made to describe atrazine toxicity and its changes throughout succession of periphyton communities of an undisturbed Mediterranean stream. Toxicity was assessed by short-term physiological tests (concentration-effect curves of photosynthesis to atrazine) in the laboratory using artificial substrates colonized in one stream site during winter, and two stream sites (one open and the other shaded) during summer. In the winter experiment, when environmental conditions were relatively steady and chlorophyll content was low, toxicity increased according to the increases in cell density and chlorophyll content throughout colonization. EC50 (concentration inhibiting photosynthesis by 50%) was above 0.8 µM atrazine until day 16 and below 0.4 µM atrazine after three weeks. In the summer experiment, under more variable environmental conditions, the differences between the EC50 at the beginning and the end of the colonization experiments were not significant (one factor ANOVA) at the two sites. EC50 was on average 0.89 µM atrazine in the shaded site and 0.29 µM atrazine in the open site. A significant negative correlation between irradiance and EC50 was observed all the experiments were considered together (r = 0.464, n = 20, p〈0.05), suggesting that light history may have an important role in the response to atrazine. This investigation reveals that the response of stream periphyton to atrazine is likely to be influenced by colonization time and the corresponding changes in algal density and community composition as well as by environmental conditions (e.g. light regime) throughout succession.
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  • 8
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Different antisera directed against mammalian and piscine pituitary hormones, as well as a battery of various conventional histochemical techniques (PAS, Alcian Blue pH 2.5, Bromophenol Blue) and lectins, were used to identify the different hormonal cell types in the pituitary of the Senegalese sole, Solea senegalensis. Prolactin and adrenocorticotrophic cells were located in the rostral pars distalis of the pituitary. Gonadotrophic, thyrotrophic and growth hormone cells were distributed in the proximal pars distalis, but gonadotrophic cells appear also at the border of the pars intermedia. Somatolactin cells, as well as α-melanotrophic cells were located in the pars intermedia of the Solea senegalensis pituitary. The PAS reaction was positive in somatolactin cells, which were unreactive with the lead--Haematoxylin technique, whereas melanotrophic cells were positive. Glycoproteins containing mannose and/or glucose, as well as N-acetyl-glucosamine and sialic acid sugar residues, are synthesized and secreted by gonadotrophic, thyrotrophic and somatolactin cells. Adrenocor ticotrophic cells and, especially, the amphiphilic somatolactin and acidophilic growth hormone cells were stained with the Bromophenol Blue technique that identifies proteins in general, but adrenocorticotrophic and growth hormone cells were unreactive towards PAS, Alcian Blue pH 2.5 and lectins (Con A and WGA)
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  • 9
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The present paper reports the immunohistochemical distribution of the gonadotropin-releasing hormone (GnRH) structures in the brain of the Senegalese sole, Solea senegalensis. In this study, we have used two antibodies against the salmon GnRH and chicken GnRH-II forms and the streptavidin–biotin-peroxidase complex method. Immunoreactive cell bodies are observed at the junction between the olfactory bulbs and the telencephalon (terminal nerve ganglion cells), in the ventral telencephalon, in the preoptic parvocellular nucleus, and in the synencephalic nucleus of the medial longitudinal fasciculus. GnRH-immunoreactive fibres were found extensively throughout the brain, located in the telencephalon, preoptic area, hypothalamus, hypophysis, optic tectum, midbrain and rhombencephalon. The antisera used in this study against the two GnRH forms exhibited cross-reactivity on the same cell masses and did not allow cell populations expressing different GnRH forms to be discriminated clearly. However, anti-salmon GnRH immunostained the GnRH cells and fibres of the forebrain much more intensely, whereas the anti-chicken GnRH antiserum shows a higher immunoreactivity on synencephalic cells of the medial longitudinal fasciculus.
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  • 10
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We report morphological and immunohistochemical evidence for a translocation of cells from the coelomic mesothelium to the aortic wall between the developmental stages HH16 and HH22 of the quail embryos. The coelomic mesothelial cells closest to the aorta showed, at these stages, increased mitotic activity, reduced intercellular adhesion, loss of tight junctions, and long basal cytoplasmic processes. Coinciding with these morphological traits, cytokeratin immunoreactivity was found in the mesothelium, in cells of the aortic wall and throughout the ventral periaortic mesenchyme (but not in the lateral and dorsal aortic regions). Vimentin immunoreactivity colocalized with cytokeratin in the mesothelial cells adjacent to the aorta. In the ventral aortic wall, cytokeratin colocalized with smooth muscle α-actin and with the 1E12 antigen (a smooth muscle-specific α-actinin isoform). We think that the morphological and immunolocalization data observed are compatible with an epithelial–mesenchymal transition by which mesothelial-derived cells contribute to the splanchnic mesoderm and aortic wall. The precise coincidence between the mesothelial contribution and the emergence of the aortic smooth muscle cells progenitors, as well as the immunolocalization data, suggest a potential relationship of the mesothelial-derived cells with this cell lineage. This may explain the observed ventrodorsal asymmetry in the distribution of smooth muscle cells progenitors in the aortic wall.
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