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
  • Articles  (166)
  • Springer  (166)
  • 2005-2009  (79)
  • 2000-2004  (87)
  • 1945-1949
Collection
  • Articles  (166)
Source
Keywords
Publisher
Years
Year
Journal
Topic
  • 11
    Electronic Resource
    Electronic Resource
    Imaging a tunneling ionization front by using a schlieren method (2000)
    Springer
    Applied physics 70 (2000), S. 395-398 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 52.40.Nk; 52.25.Jm; 52.50.Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A schlieren method was used to generate time-resolved images of the tunneling ionization front produced when an ultrashort high-power laser pulse irradiates He gas. By superimposing sequential schlieren images, we obtained information about the laser propagation and found that the ionization front propagated farther with decreasing density of the target gas. Ray-tracing suggested that this density dependence is a result of the spatial distribution of the laser intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050064
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Observation of X-ray spectra from nitrogen clusters irradiated with high-intensity ultrashort laser pulses (2000)
    Springer
    Applied physics 70 (2000), S. 549-554 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 33.00; 34.00; 36.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. X-ray spectra from nitrogen clusters irradiated with ultrashort laser pulses are reported. The line spectra of H-like and He-like nitrogen ions have been observed by irradiation with 100 fs, 800 nm pulses at 7×1017 W/cm2 irradiance. The generation of highly charged ions of N6+ and N7+ is explained by the optical field-induced ionization and the subsequent collisional ionizations in the clusters. The He-δline has anomalously high brightness compared to other He-like lines. It is ascribed to charge exchange, which preferentially populates the n=5 level of N5+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050860
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Soft X-ray emission from noble gas clusters excited by an ultrashort KrF laser pulse (2000)
    Springer
    Applied physics 70 (2000), S. 783-787 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 36.40Gk; 52.25Nr; 52.50Jm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. X-ray conversion efficiency from laser energy was measured for various noble-gas clusters excited by an ultrashort KrF laser pulse. For Xe clusters, the conversion efficiency from laser energy into soft X-rays with wavelengths from 5 to 20 nm was estimated to be 1.1 %/sr, which was comparable to that obtained for solid targets. This high X-ray conversion efficiency was due to the large absorption fraction of the laser light by Xe clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050009
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Effects of Pregnancy and Lactation on Trabecular Bone and Marrow Adipocytes in Rats (2000)
    Springer
    Calcified tissue international 67 (2000), S. 367-372 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Pregnancy — Lactation — Bone histomorphometry — Marrow adipocyte — Bone formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Changes in the structure and metabolism of trabecular bone and marrow adipocytes in rats during pregnancy and the early stage of postpartum were evaluated by investigating bone mineral density (BMD) and bone and fat histomorphometry. Forty-nine female virgin Sprague-Dawley rats aged 200 days were mated and divided into seven groups: (1) beginning controls; (2) antepartum-on-day-7; (3) antepartum-on-day-21; (4) nonlactating on the fourth postpartum day; (5) nonlactating on the sixth postpartum day; (6) nonlactating on the eighth postpartum day; (7) lactating on the eight postpartum day. The significant decreases occurred in the trabecular bone at the end of pregnancy and lactation, and the bone formation increases and the bone structure is almost recovered in nonlactating rats within 6 days of postpartum. The percent adipocyte volume, adipocyte number, and unit adipocyte volume significantly decreased during postpartum whether lactating or nonlactating, and they significantly showed negative correlation with the osteoid volume values. The serum triglyceride value and body weight of the seven groups correlated significantly with the unit adipocyte volume value (r = 0.49, P= 0.004; r = 0.58, P= 0.0005, respectively). We concluded that bone resorption and formation are regulated separately during late pregnancy and lactation and that the recovery of BMD from lactation appears to rely on an acceleration of bone formation. Furthermore, the metabolism of the marrow adipocyte may be correlated with bone formation rates, serum triglyceride value, and body weight during pregnancy and early stage of puerperium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002230001145
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Polymerization of guaiacol by lignin-degrading manganese peroxidase from Bjerkandera adusta in aqueous organic solvents (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 104-111 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Lignin-degrading manganese (II) peroxidase (MnP) purified from the culture of a wood-rotting basidiomycete, Bjerkandera adusta, was used in the polymerization of guaiacol. MnP was found to catalyze polymerization of guaiacol in 50% aqueous acetone, dimethyl formamide, methanol, ethanol, dioxane, acetonitrile, ethylene glycol and methylcellosolve. Maximum yield of polyguaiacol was achieved in 50% aqueous acetone. The weight average molecular weight (M w) of the polymer was estimated to be 30 300 by gel permeation chromatography. However, matrix-assisted laser desorption ionization time of flight mass spectroscopy (MALDI-TOF-MS) analysis gave a more reliable M w of 1690. IR, 13C-NMR, MALDI-TOF-MS and pyrolysis GC-MS analyses showed the presence of C–C and C–O linkages and quinone structure in polyguaiacol. It was also indicated that polyguaiacol has a methoxy-phenyl group as the terminal moiety. This suggests that polyguaiacol is a branched polymer in which guaiacol units are cross-linked at the phenolic group. Thermal gravimetric and differential scanning calorimetric analyses were also carried out. MnP also catalyzed the polymerization of o-cresol, 2,6-dimethoxyphenol and other phenolic compounds and aromatic amines. M w of these polymers ranged from around 1000 to 1500.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000340
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    A sex pheromone component novel to Ostrinia identified from Ostrinia latipennis (Lepidoptera: Crambidae) (2000)
    Springer
    Chemoecology 10 (2000), S. 143-147 
    Details
    ISSN: 1423-0445
    Keywords: Key words.Ostrinia latipennis– sex pheromone – (E)-11-tetradecenol – Lepidoptera – Crambidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary. Extracts from the sex pheromone gland of Ostrinia latipennis (Lepidoptera: Crambidae) were analyzed by gas chromatography-electroantennographic detection (GC-EAD) and GC-mass spectrometry. Only an EAD-active compound was detected in the extract, and it was identified as (E)-11-tetradecenol (E11-14:OH). In a wind-tunnel bioassay, E11-14:OH elicited a series of mate finding behaviors from males, although it was far less active than virgin females and crude extract of the pheromone gland. The attractiveness of E11-14:OH to O. latipennis males was confirmed by field trapping experiments. Based on these findings, we concluded that E11-14:OH, which is novel to the genus Ostrinia, is a major component of the sex pheromone in O. latipennis. The significance of the use of alcohol in place of the usual acetates in Ostrinia is discussed in relation to the pheromone biosynthesis system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001816
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    A New Method of Analyzing Edge Effect in Phase Contrast Imaging with Incoherent X-rays (2000)
    Springer
    Optical review 7 (2000), S. 566-572 
    Details
    ISSN: 1349-9432
    Keywords: phase contrast ; incoherent X-ray ; edge effect ; half-width of edge enhancement ; Cu ; Mo ; W anodes X-ray tubes ; refraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method has been devised to calculate the half-width of the phase contrast enhanced edge of an X-ray- image with incoherent X-rays. This method is based on changes in the wave fronts of X-rays after penetrating an object, and it takes into account the blur due to penumbra observed in practical radiographic imaging. The method closely predicted edge enhancement when images of a plastic fiber were produced with practical X-ray tubes (Cu, Mo, and W anodes with focus-diameters of 10,100, and 40 μ, respectively). Thus, the method shows promise in facilitating phase contrast X-ray imaging in both medical radiography and non-destructive inspection using incoherent X-rays from X-ray tubes with substantial focus-sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10043-000-0566-z
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Meiotic segregation analysis of a 14;21 Robertsonian translocation carrier by fluorescence in situ hybridization (2000)
    Springer
    Human genetics 〈Berlin〉 106 (2000), S. 188-193 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Meiotic segregation of chromosomes 14 and 21 in sperm from a 14;21 Robertsonian translocation carrier was analyzed with dual-color FISH using two locus-specific DNA probes (Tel 14q and LSI 21). The frequency of normal or chromosomally balanced sperm, resulting from alternate segregation, was 88.42%. The frequency of unbalanced sperm, resulting from adjacent segregation, was 11.25%. These observed frequencies deviated significantly from the theoretical frequencies (33.33% and 66.67%, respectively) based on random chromosome segregation, with sperm resulting from alternate segregation being preferentially produced in the translocation carrier. With respect to the chromosomally unbalanced sperm, the frequency of 21q disomic sperm was 2.45%, which is in agreement with the frequencies of unbalanced fetuses or offspring at the time of amniocentesis or at term (0–4.3%) reported by others. Although the frequency of 14 or 21 nullisomic sperm should be theoretically equal to that of 14q or 21q disomic sperm in both the carrier and controls, the frequency of nullisomic sperm was significantly higher than that of disomic sperm in the carrier (P=0.0009 for chromosome 14, P〈0.0001 for chromosome 21) but not in the controls (P=0.091 for chromosome 14, P=0.74 for chromosome 21). This evidence suggests the occurrence of maturation arrest during spermatogenesis of the carrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004399900216
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Carboxin resistance transformation of the homobasidiomycete fungus Pleurotus ostreatus (2000)
    Springer
    Current genetics 37 (2000), S. 209-212 
    Details
    ISSN: 1432-0983
    Keywords: Key words Basidiomycete ; Transformation ; White-rot fungi ; Carboxin ; Succinate:ubiquinone oxidoreductase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A novel selection marker gene for transformation of the white-rot basidiomycete Pleurotus ostreatus was developed by introducing a point mutation in a gene which encodes the iron-sulfur protein (Ip) subunit of succinate dehydrogenase. The mutant gene, Cbx R, encodes a modified Ip subunit with an amino-acid substitution (His239 to Leu) and confers resistance to the systemic fungicide, carboxin. The DNA sequence was integrated ectopically in the chromosome of the transformants. This is the first report of a homologous marker gene which is available for the molecular breeding of an edible mushroom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050521
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Identification of settling and early postlarval stages of mussels (Mytilus spp.) from the Pacific coast of North America, using prodissoconch morphology and genomic DNA (2000)
    Springer
    Marine biology 137 (2000), S. 811-818 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Detailed inventories of the benthos and field studies of the settlement and recruitment processes of marine benthic invertebrates require accurate identification of newly settled larvae and early juvenile stages. We provide morphological criteria, visible under a good quality dissecting stereomicroscope, by which to discriminate between species of the settling larval and early postlarval stages (∼250 to 700 μm shell length) of mussels of the genus Mytilus on the west coast of Vancouver Island and Southern California. Compared to the bay mussel (M. trossulus), the sea mussel (M. californianus) has: (i) a shallower and flatter umbo, the latter corresponding to a significantly less pronounced prodissoconch I (PI) curvature and (ii) a greater PI length; as well as (iii) a wider separation between the provincular lateral teeth (PLT). The PLT distance is a new term denoting the separation between the midpoint of two reddish pigment spots of the provinculum (larval hinge apparatus) region of settling larvae and early postlarvae of Mytilus spp. from the East Pacific Coast. These spots mark the larger provincular lateral teeth, situated at either end of the provinculum. We confirmed the validity of morphological criteria by comparing PCR products of genomic DNA of provisionally identified postlarvae. Furthermore, measurements of PI lengths and PLT distance from well-preserved postlarvae of sea mussels (M. californianus) and of bay mussels (M. galloprovincialis) from Southern California indicate that the PI morphology and morphometry, and PLT distance criterion apply for that region as well. The criteria presented here can also apply to the advanced (competent) veliger stages, as the latter may settle (i.e. become the “settling” stage) upon encountering a suitable substrate. Our present and previously published work provide economical and effective identification methods that can be used to discriminate among early life history stages (∼250 μm to 5.0 mm shell length) of Mytilus spp. along the west coast of North America.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000442
    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...