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
  • 1
    Electronic Resource
    Electronic Resource
    Catalytic hydrotreating of indole, benzothiophene, and benzofuran over Mo2N (1993)
    Springer
    Catalysis letters 18 (1993), S. 1-8 
    Details
    ISSN: 1572-879X
    Keywords: Hydrotreating ; indole ; benzofuran ; benzothiophene, Mo2N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The activity of γ-Mo2N for heteroatom removal from benzofuran, benzothiophene, and indole has been investigated. γ-Mo2N is found to be an effective catalyst in all three cases. The distribution of products observed as a function of temperature suggests that the reaction mechanism is similar for all three reactants. Rapid hydrogenation of the heterocyclic ring is followed by hydrogenolysis of the X-C bond in the saturated ring and release of the heteroatom as XH n (X = O, S, N). The product formed in the last step of the sequence is ethylbenzene. Hydrogenation of the benzene ring in ethylbenzene is not observed, but evidence is found for hydrogenolysis and dealkylation of the alkyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00769492
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The activity of transition metal nitrides for hydrotreating quinoline and thiophene (1993)
    Springer
    Catalysis letters 21 (1993), S. 11-18 
    Details
    ISSN: 1572-879X
    Keywords: Metal nitride catalysis ; quinoline hydrodenitrogenation ; thiophene hydrodesulfurization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An investigation has been conducted of the activity of AlN, BN, TiN, VN, Mo2N, and W2N as catalysts for quinoline hydrodenitrogenation (HDN). The activity of Mo2N and VN for thiophene hydrodesulfurization (HDS) and the concurrent hydrotreatment of quinoline and thiophene have also been examined. Bulk AlN, BN, and TiN were obtained with low surface areas and found to be inactive for the HDN of quinoline. Bulk Mo2N, W2N, and VN could be obtained with high surface area. Each of these nitrides exhibited high activity for quinoline HDN, the turnover frequency for this reaction decreasing in the order Mo2N〉W2N〉VN. Highly dispersed VN supported on SiO2 was found to have a specific activity for quinoline HDN identical to that of bulk VN. Both bulk Mo2N and 27% VN/SiO2 exhibit high activity for the HDS of thiophene. The behavior of these two catalysts for the concurrent hydrotreatment of quinoline and thiophene is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767365
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A search for collision orbits in the free-fall three-body problem I. Numerical procedure (1995)
    Springer
    Celestial mechanics and dynamical astronomy 62 (1995), S. 335-362 
    Details
    ISSN: 1572-9478
    Keywords: Three-body problem ; binary collisions ; triple collisions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A numerical procedure is devised to find binary collision orbits in the free-fall three-body problem. Applying this procedure, families of binary collision orbits are found and a sequence of triple collision orbits are positioned. A property of sets of binary collision orbits which is convenient to search triple collision orbits is found. Important numerical results are formulated and summarized in the final section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692285
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of analcime from volcanic sediments in sodium silicate solution (1973)
    Springer
    Contributions to mineralogy and petrology 42 (1973), S. 81-92 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Analcime has been synthesized from natural rhyolitic tuff and green tuff (Miocene age) at 200° C and 20 kg/cm2 with solution of Na2SiO3 (12%) in 50- to 260-hr runs. From the diffraction intensities, it was found that the alteration products of green tuff contained more analcime than those of rhyolitic tuff. It has been concluded that the lithological character of starting materials and the chemical behavior of reaction products are important controlling factors in analcimization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371499
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Quantum mechanical studies of environmental effects on biomolecules (1979)
    Springer
    Theoretical chemistry accounts 54 (1979), S. 73-82 
    Details
    ISSN: 1432-2234
    Keywords: Thiourea ; Conjugated thiocarbonyl ; Thioanalogs ; Hydration of thiocarbonyls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SCFab initio computations have been performed on the structure, molecular potential and hydration scheme of thiourea in view of a comparison with urea and more generally as a model of the conjugated S=CNH-group as compared to O=CNH-. In contrast to the carbonyl oxygen, both σ and π acceptor, the sulfur atom of the thiocarbonyl is a σ donor but a π acceptor and this results in an enhancement of the double-bond character of thiourea. The CN bond is less attractive for a proton than urea. The hydration scheme indicates a maximum number of four water molecules directly bound to thiourea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02394619
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Quantum mechanical studies of environmental effects on biomolecules (1979)
    Springer
    Theoretical chemistry accounts 54 (1979), S. 73-82 
    Details
    ISSN: 1432-2234
    Keywords: Thiourea ; Conjugated thiocarbonyl ; Thioanalogs ; Hydration of thiocarbonyls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SCFab initio computations have been performed on the structure, molecular potential and hydration scheme of thiourea in view of a comparison with urea and more generally as a model of the conjugated S=CNH-group as compared to O=CNH-. In contrast to the carbonyl oxygen, both σ and π acceptor, the sulfur atom of the thiocarbonyl is a σ donor but a π acceptor and this results in an enhancement of the double-bond character of thiourea. The CN bond is less attractive for a proton than urea. The hydration scheme indicates a maximum number of four water molecules directly bound to thiourea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938774
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Detection of a sequence involved in actin-binding and phosphoinositide-binding in the N-terminal side of cofilin (1999)
    Springer
    Molecular and cellular biochemistry 190 (1999), S. 133-141 
    Details
    ISSN: 1573-4919
    Keywords: cofilin ; actin-binding protein ; actin ; inositol phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Cofilin is an actin-binding protein of low molecular weight which is widely distributed in eukaryotes and is deeply involved in the dynamics of actin assembly in the cytoplasm. The actin-binding ability of cofilin is inhibited by inositol phosphates (PIP2), and the PIP2- and actin-binding site(s) has been localized in residues W104 - M115 of the cofilin primary sequence (Yonezawa et al. 1991). In the present study, in order to further clarify the functional domains in cofilin molecule, we constructed expression vectors containing cDNAs of different size with deletion at the 3′-region of the open reading frame. The truncated cofilin molecules produced in E. coli were purified and examined for their actin-binding and PIP2-binding ability. We found that the truncated cofilin molecule without C-terminal residues #100-#166 including the previously-described actin-binding site could be cross-linked with actin by EDC, a zero-length cross-linker. In addition, these truncated peptides as well as synthetic peptides corresponding to the N-terminal sequence of cofilin suppressed the inhibitory action of PIP2 on actin-cofilin interaction. These results strongly suggest that additional actin- and PIP2-binding sites exist in the N-terminal region of cofilin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006962210692
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Transient expression of a calcium-binding protein (spot 35-calbindin) and its mRNA in the immature pituicytes of embryonic rats (1991)
    Springer
    Cell & tissue research 266 (1991), S. 325-330 
    Details
    ISSN: 1432-0878
    Keywords: Calbindin ; Neurohypophysis ; Development, ontogenetic ; Immunohistochemistry ; In-situ hybridization ; Electron microscopy ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Spot 35 protein is a Ca-binding protein originating from the rat cerebellum; it is now referred to spot 35-calbindin. This protein is expressed in immature pituicytes of the neurohypophyseal anlage in the E11–E18 rat embryo. The gene expression of spot 35-calbindin was detected by in-situ hybridization analysis only at stage E11–E12. Profiles of spot 35-positive nerve fibers of a neurosecretory nature were found in anlage at stage E16. At this stage, some immature pituicytes are partially immunopositive for spot 35-calbindin only in their peripheral cytoplasm; others are immunonegative. At birth and thereafter through adulthood, abundant nerve fibers are the sole structures immunoreactive for spot 35-calbindin; all the pituicytes are immunonegative, resulting in a light-microscopic appearance of numerous immunonegative round profiles, corresponding to pituicytes, and capillaries embedded in the granularly immunostained neurohypophysis. The present findings suggest that, during specific embryonic stages, immature pituicytes exert some as yet unidentified roles related to Ca-mediated functions involving the expression of spot 35-calbindin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318188
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Search for CDW in K metal (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 651-656 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fundamental question of whether the ground state of the alkali metals is a nearly-free-electron state or a charge-density-wave (CDW) state has remained unresolved for over 30 years, ever since Overhauser first suggested the possibility of a CDW ground state in these metals in 1962. For K metal, no evidence for CDW satellites was seen in x-ray measurements at 10 K (You et al., 1987). We made x-ray measurements for a K single crystal down to 50 mK. We observed the satellite-like spots at lower temperatures below about 10 K. We also measured the temperature dependence of the magnetic susceptibility between 1.8 K and 300 K by a SQUID magnetometer. Below about 20 K the magnetic susceptibility starts to decrease and below about 10 K it decreases more rapidly with decreasing temperature. We will discuss the possibility of CDW in K metal from our experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753369
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Resolution of Pheromonal Epoxydienes by Chiral HPLC, Stereochemistry of Separated Enantiomers, and Their Field Evaluation (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1403-1417 
    Details
    ISSN: 1573-1561
    Keywords: Chiral HPLC ; sex pheromone ; Lepidoptera ; Geometridae ; epoxydiene ; stereochemistry ; Mosher's method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Resolution of insect pheromonal cis-epoxydiene racemates derived from (Z,Z,Z)-3,6,9-trienes with a C18–C23 chain was examined utilizing chiral HPLC columns, and the result showed that a Chiralpak AS column was suitable to separate enantiomers of the 3,4-epoxides, and a Chiralpak AD column was indispensable for the resolution of the racemic 6,7- and 9,10-epoxides. The absolute configuration of the enantiomers of the 3,4- and 9,10-epoxides separated by HPLC was studied after methanolysis of their epoxy rings. Examination of the 1H NMR data from esters of the methoxyalcohols produced by a modified Mosher's method with (S)- and (R)-α-methoxy-α-(trifluoromethyl)phenylacetic acid indicated that the dextrorotatory parent epoxides with a shorter R t were 3S,4R and 9S,10R isomers and the levorotatory enantiomers having a longer R t possessed 3R,4S and 9R,10S configuration. Field tests with both enantiomers of (Z,Z)-6,9-cis-3,4-epoxynonadecadiene separated by HPLC with the chiral column revealed new specific attraction of geometrid forest defoliators, Pachyerannis obliquaria, to the 3R,4S isomer and Zethenia albonotaria nesiotis to the 3S,4R isomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006472.12370.c6
    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...