ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Springer  (16)
  • American Chemical Society  (2)
  • American Institute of Physics (AIP)  (1)
  • 2005-2009  (3)
  • 1995-1999  (9)
  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    The infrared spectrum of XeH+ (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 159-162 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Fourier transform emission spectrum of XeH+ was observed in the infrared region of the spectrum. The 1–0 and 2–1 vibration–rotation bands for 132XeH+, 131XeH+, and 129XeH+ were recorded from a nickel hollow cathode discharge in xenon and hydrogen. Molecular constants, including Re=1.602 813(6) A(ring), Be=6.560 686(50), αe=0.186 739(14), ωe=2269.9674(11), and ωexe=41.328 30(34) cm−1 for 132XeH+, were extracted from the line positions. Our work represents the first high-resolution detection of XeH+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453611
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Isolation of mutants sensitive to 2-amiriopurine and alkylating agents and evidence for the role of DNA methylation in Penicillium chrysogenum (1986)
    Springer
    Current genetics 10 (1986), S. 557-560 
    Details
    ISSN: 1432-0983
    Keywords: Methylation ; DNA ; Penicillium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using high performance liquid chromatography, the presence of N6-methyladenine has been found at a level of 0.1 mol percent in DNA extracted from Penicillium chysogenum. No 5-methylcytosine was detected. A mutant strain HP547, which is sensitive to the lethal effects of N-methyl-N1-nitro-N-nitrosoguanidine, methylmethane sulphonate and the base analogue 2-aminopurine shows an increased spontaneous mutation rate and no detectable DNA methylation. Comparison of restriction enzyme digests of wild type and undermethylated strains indicated that methylation was occurring at a different sequence to that of the Dam methylase system of E. coli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447390
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Transient expression of electroporated DNA in monocotyledonous and dicotyledonous species (1987)
    Springer
    Plant cell reports 6 (1987), S. 265-270 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transient expression of electroporated DNA was monitored in protoplasts of several monocot and dicot species by assaying for expression of chimeric chloramphenicol acetyltransferase (CAT) gene constructions. Expression was obtained in the dicot species of Daucus carota, Glycine max and Petunia hybrida and the monocot species of Triticum monococcum, Pennisetum purpureum, Panicum maximum, Saccharum officinarum, and a double cross, trispecific hybrid between Pennisetum purpureum, P. americanum, and P. squamulatum. Recovery and viability of protoplasts after electroporation decreased with increasing voltages and capacitance while CAT activity increased up to a critical combination of voltage and capacitance beyond which the activity dramatically decreased. The optimal compromise between DNA uptake and expression versus cell survival was determined for D. carota and applied successfully to the other species. Maximum transient expression occurred 36 hours after electroporation of D. carota. The potential for using this procedure to rapidly assay gene function in dicot and monocot cells and application of this technique to obtain transformed cereals is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271995
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Comparison of ribosomal DNA ITS regions among geographic isolates of Cenococcum geophilum (1999)
    Springer
    Current genetics 35 (1999), S. 527-535 
    Details
    ISSN: 1432-0983
    Keywords: Key wordsCenococcum geophilum ; Internal transcribed spacer (ITS) ; Ribosomal DNA (rDNA) ; Group-I intron ; Mycorrhizae ; RNA secondary structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cenococcum geophilum is an ecologically important mycorrhizal fungus with a global distribution and a wide host range. It has been difficult to study since it forms only sterile mycelia and, occasionally, sclerotial bodies. Because of its lack of morphological variability, its taxonomy and phylogenetic origins have until recently remained unclear. To better understand the genetic variation and environmental adaptability of C. geophilum, a molecular phylogeny was constructed based on the nuclear ribosomal DNA internal transcribed spacers (ITS1 and ITS2) of 69 isolates from various hosts and habitats. The results suggest DNA sequence conservation in the ITS regions. Considering its broad geographic and host range, this ITS conservation was unexpected. Our data imply that the ITS2 region is under evolutionary pressure to maintain the RNA secondary structure (similar to the pressure on the CgSSU introns) involved in the post-transcriptional processing of rRNA. Also, C. geophilum has very short ITS regions, thus limiting the number of mutable sites. This limited ITS variability suggests a recent radiation of C. geophilum, having been geographically distributed by a variety of efficient processes. C. geophilum appears to be a single taxonomic entity, possibly a single species. Therefore, it is an extremely adaptable, as well as ecologically valuable, taxon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050449
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Group-I intron family in the nuclear ribosomal RNA small subunit genes of Cenococcum geophilum isolates (1996)
    Springer
    Current genetics 29 (1996), S. 377-387 
    Details
    ISSN: 1432-0983
    Keywords: Key words Self-splicing ; Group-I intron ; Ribosomal RNA ; Cenococcum geophilum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A family of optional group-I introns was found near the 3′ end of the nuclear small subunit rRNA genes in 61 out of 70 isolates of the deuteromycete mycorrhizal fungus Cenococcum geophilum. DNA sequence polymorphisms among the introns (termed CgSSU introns) from ten of the isolates were studied. The sequences, ranging in size from 488 to 514 nucleotides, were from 93.2% to 99.6% similar to each other. Mutations were less common in predicted base-paired regions (33% of all mutations) than in free-standing regions (67%). The introns were self-spliced in vitro and were closest to subgroup IC1 according to sequence and predicted secondary structure. Group-I intron pairing regions P1 through P10, including core regions P, Q, R and S, were present in all ten CgSSU introns studied. No lengthy open reading frames were found in any of the introns, indicating that the introns do not encode a protein, and therefore may not be mobile. It is likely that a single intron entered a progenote of C. geophilum and changed as the species evolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050059
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Object Recognition Based on Human Saccadic Behaviour (1999)
    Springer
    Pattern analysis and applications 2 (1999), S. 251-263 
    Details
    ISSN: 1433-755X
    Keywords: Key words: Computer vision; Object recognition; Saccadic behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract: The automated recognition of targets in complex backgrounds is a difficult problem, yet humans perform such tasks with ease. We therefore propose a recognition model based on behavioural and physiological aspects of the human visual system. Emulating saccadic behaviour, an object is first memorised as a sequence of fixations. At each fixation an artificial visual field is constructed using a multi-resolution/ orientation Gabor filterbank, edge features are extracted, and a new saccadic location is automatically selected. When a new image is scanned and a ‘familiar’ field of view encountered, the memorised saccadic sequence is executed over the new image. If the expected visual field is found around each fixation point, the memorised object is recognised. Results are presented from trials in which individual objects were first memorised and then searched for in collages of similar objects acting as distractors. In the different collages, entries of the memorised objects were subjected to various combinations of rotation, translation and noise corruption. The model successfully detected the memorised object in over 93% of the ‘object present’ trials, and correctly rejected collages in over 98% of the trials in which the object was not present in the collage. These results are compared with those obtained using a correlation-based recogniser, and the behavioural model is found to provide superior performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100440050033
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Plant regeneration and multiplication of the emergent wetland monocot Juncus accuminatus (1998)
    Springer
    Plant cell reports 17 (1998), S. 656-660 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsJuncus accuminatus ; Callus regeneration ; Medium pH ; Phytoremediation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A reliable callus regeneration and shoot multiplication system for wetland monocot Juncus accuminatus has been established. Callus was induced from 6-day-old seedlings on Murashige and Skoog medium supplemented with 5 mg/l picloram. The callus differentiated into shoots upon transfer to 5 mg/l benzyladenine (BA)-supplemented medium. Effects of medium pH (3.8–7.8) and source of callus (grown in the dark or continuous light) on regeneration were determined. Both parameters significantly influenced regeneration. Regenerated shoots were multiplied by subculturing shoots onto 5 mg/l BA medium at 4-week intervals. The regenerated shoots were rooted on 0.1 mg/l naphthaleneacetic-acid-supplemented medium. The rooted plants were transferred to pots containing a commercial potting mix and established in the greenhouse. Plants covered with plastic grew faster and flowered earlier than uncovered plants. All plants set viable seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050460
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Shoot regeneration and plant acclimatization of the wetland monocot Cattail (Typha latifolia) (1998)
    Springer
    Plant cell reports 18 (1998), S. 71-75 
    Details
    ISSN: 1432-203X
    Keywords: Key wordsTypha latifolia ; Cattail ; Remediation ; Shoot regeneration ; Wetland monocot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A regeneration system for broadleaf cattail (Typha latifolia), a common freshwater wetland monocot, was established. Callus was induced from 3 day-old seedlings on Murashige and Skoog medium supplemented with picloram or 2,4-dichlorophenoxyacetic acid (2,4-D). Picloram induced more callus growth than 2,4-D. Callus proliferated predominantly from the root-shoot junction and sporadically from the roots. Upon transfer to N6-benzyladenine-supplemented medium, callus regenerated shoots. The mode of regeneration was organogenesis, with shoots arising from organized areas of callus. The regenerated shoots rooted in vitro and, on transfer to pots containing a commercial potting mix, were established in a greenhouse. The plants grew vigorously and produced a high root mass. No albinos and no morphological aberrations were observed in the regenerates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050534
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Fluorescence characteristics of photoautotrophic soybean cells (1989)
    Springer
    Photosynthesis research 21 (1989), S. 93-106 
    Details
    ISSN: 1573-5079
    Keywords: higher plant photosynthesis ; chlorophyll a fluorescence ; plastoquinone pool ; photoautotrophic soybean cell ; diuron ; atrazine ; primary (quinone) electron acceptor ; QB/QB -, (soybean, spinach)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report here the first measurements on chlorophyll (Chl) a fluorescence characteristics of photoautotrophic soybean cells (cell lines SB-P and SBI-P). The cell fluorescence is free from severe distortion problems encountered in higher plant leaves. Chl a fluorescence spectra at 77 K show, after correction for the spectral sensitivity of the photomultiplier and the emission monochromator, peaks at 688, 696 and 745 nm, representing antenna systems of photosystem II-CP43 and CP47, and photosystem I, respectively. Calculations, based on the complementary area over the Chl a fluorescence induction curve, indicated a ratio of 6 of the mobile plastoquinone (including QB) to the primary stable electron acceptor, the bound plastoquinone QA. A ratio of one between the secondary stable electron acceptor, bound plastoquinone QB, and its reduced form QB - was obtained by using a double flash technique. Owing to this ratio, the flash number dependence of the Chl a fluorescence showed a distinct period of four, implying a close relationship to the ‘S’ state of the oxygen evolution mechanism. Analysis of the QA - reoxidation kinetics showed (1) the halftime of each of the major decay components (∼ 300 μs fast and ∼ 30 ms slow) increases with the increase of diuron and atrazine concentrations; and (2) the amplitudes of the fast and the slow components change in a complementary fashion, the fast component disappearing at high concentrations of the inhibitors. This implies that the inhibitors used are able to totally displace QB. In intact soybean cells, the relative amplitude of the 30 ms to 300 μs component is higher (40:60) than that in spinach chloroplasts (30:70), implying a larger contribution of the centers with unbound QB. SB-P and SBI-P soybean cells display a slightly different sensitivity of QA - decay to inhibitors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033363
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Modelling of liquid-liquid metal mixing (1987)
    Springer
    Flow, turbulence and combustion 44 (1987), S. 175-195 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Mathematical and physical modelling have been used interactively to predict the behaviour of two liquid metals mixing in the nosetip of a Roll-casting machine. Attention has been given to the transient development of density driven backflows due to incomplete mixing and forward transport of fluid. The results are compared with temperature and composition data obtained from metallurgical trials. Mixing reactions which may involve a simultaneous phase change (partial solidification) are also discussed in relation to the local mixing conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00412012
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...