Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Digitale Medien  (31)
  • 2000-2004  (5)
  • 1995-1999  (18)
  • 1955-1959  (8)
  • 11
    Digitale Medien
    Digitale Medien
    Mikromethoden in der Halbleiterforschung (1956)
    Springer
    Microchimica acta 44 (1956), S. 414-421 
    Details
    ISSN: 1436-5073
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01216627
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 12
    Digitale Medien
    Digitale Medien
    Transient glutamic acidaemia (1996)
    Springer
    European journal of pediatrics 155 (1996), S. 308-310 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Key words Amino acid metabolism ; Glutamic acid ; Newborn infants ; Light for gestational age
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract We report on a severely hypotrophic male twin with persistent diarrhoea and metabolic acidosis during the first 4 weeks of life, who showed a fivefold normal glutamate concentration in plasma. Further evaluation excluded major defects in amino acid metabolism and after 5 months glutamate concentrations returned to normal. Neither the dizygotic twin sibling nor the parents revealed any clinical abnormalities or acid base or amino acid disturbances. Conclusion Transient glutamic acidaemia seems to be an extremely rare condition in newborn infants and appears to be without negative impact on the physical and neurological development during the first months of life.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004310050406
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 13
    Digitale Medien
    Digitale Medien
    Deuteron and triton production with high energy sulphur and lead beams (2002)
    Springer
    The European physical journal 23 (2002), S. 237-247 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Proton and deuteron production has been observed in S+S and S+Pb collisions at 200 A $\cdot$ GeV and in Pb+Pb reactions at 158 A $\cdot$ GeV at the CERN SPS accelerator. For Pb+Pb triton production was also measured. The p and d spectra as well as the p and t spectra were observed in similar rapidity ranges and over similar ranges of transverse momenta per nucleon, making it possible to interpret the cross sections of the composite particles in terms of coalescence mechanisms. Volumes of homogeneity were extracted and compared to pion-pair HBT interferometry results. Special attention is given to the dependence on transverse mass, centrality and rapidity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100520100877
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 14
    Digitale Medien
    Digitale Medien
    Space-time evolution of the hadronic source in peripheral to central Pb+Pb collisions (2000)
    Springer
    The European physical journal 18 (2000), S. 317-325 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Two-particle correlations of negative pions as a function of charged particle multiplicity are studied in Pb+Pb collisions at $\sqrt{s}=17.3$ GeV per nucleon using the NA44 experiment at the CERN Super Proton Synchrotron(SPS). We find that the source size parameters increase with the charged particle multiplicity. However the slope of the source size parameters plotted as a function of charged multiplicity is slightly larger at high multiplicity than at low multiplicity. The value of $\lambda$ is independent of charged multiplicity. For Pb+Pb collisions, $R_L$ is larger than $R_{TS}$ and $R_{TO}$ for all multiplicity intervals, whereas these three radius parameters were approximately equal in S+Nucleus collisions. The ratios ( $R_L/R_{TS}$ ) and ( $R_L/R_{TO}$ ) for Pb+Pb data show almost no dependence on charged multiplicity. The duration of pion emission $\Delta \tau$ is constant at 3.8 $\pm$ 1.1 fm/c as a function of the charged multiplicity in Pb+Pb collisions. Effective volume (V) is also calculated as V= $\pi\times R_{TS}^2\times R_L$ , assuming a cylindrically shaped source. We found, within the limited statistics, the effective volume rapidly increases at high multiplicity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100520000543
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 15
    Digitale Medien
    Digitale Medien
    Synthesis, crystal structure, spectroscopic and thermal investigation of trans-diazido- tetrakis(pyrazole)manganese(II) and trans- diaquadiazidobis(3,4-dimethylpyridine)manganese(II) (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 29-34 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Two mixed ligand MnII complexes, namely trans- diazidotetrakis(pyrazole)manganese(II) (1) and trans-diaquadiazidobis(3,4-dimethylpyridine)manganese(II) (2) have been synthesized and characterized by spectroscopic and crystallographic methods. The i.r. and Raman spectra are reported and correlated with the structures of both complexes. The e.s.r. spectra of the solid complexes and their solutions are reported. Both complexes are monomeric, with distorted octahedral coordination and terminal azide. The thermal decomposition of both complexes was investigated derivatographically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006971809550
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 16
    Digitale Medien
    Digitale Medien
    1D Polymeric copper(II) azido complexes. Synthesis, spectral and structural studies of [Cu(ethyl isonicotinate)2(N3)2]n and [Cu(methyl isonicotinate)2(NO3)(N3)]n complexes (1999)
    Springer
    Transition metal chemistry 24 (1999), S. 454-458 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Two new 1:2 polymeric complexes of copper(II) azide with ethyl isonicotinate (1) and methyl isonicotinate (2) have been synthesized and characterized by spectroscopic and crystallographic methods. The polymeric structure of complex (1) features six coordinated copper centers, a pair of trans-coordinated ligand molecules, and asymmetric μ2-1,1 and μ2-1,3-azido bridges resulting in a 1D chain structure. In complex (2), each copper atom which is located at an inversion center, is coordinated to a pair of trans ligand molecules, to the nitrogen atom of two μ-1,1-azido ligand and to an oxygen atom of a bridging (μ-O,O′) nitrogen group. The i.r., electronic and e.s.r. spectra of the complexes are reported.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006985225610
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 17
    Digitale Medien
    Digitale Medien
    Isomeric Tetrakis(dimethylamino)naphthalenes: Syntheses, Structure-Dependence of Basicities, Crystal Structures, and Physical Properties (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1617-1622 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Tetrakis(dimethylamino)naphthalenes ; Basicity ; Hydrogen bonds ; Cyclicvoltammetry ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: ---For comparison to the recently described 2,3,6,7-tetrakis(dimethylamino)naphthalene (1) the three isomers 2,3, and 4 were synthesized. The basicities of this group of isomers are strongly dependent upon the different mutual orientations of the pairs of dimethylamino substituents: only the isomers 3 and, partially, 4, both with dimethylamino groups in adjacent peri-positions of the naphthalene, are strong “proton sponges”. For the isomers 1 and 2 with the same number and kind of twofold dimethylamino substituents in neighbouring ortho-positions, however, no significant basicity increase is observed. To explain this difference between the two groups of isomers it is suggested that in the ortho-pairs of 1 and 2 the C-N bonds diverge considerably, leading to an increased N···N distance and consequently to less stable [N···H···N]+ hydrogen bonds in contrast to the parallel C-N bonds in the peri-substituted isomers 3 and 4. X-ray crystal structure analyses of the bases and of some of the salts derived therefrom were solved and are discussed. Cyclic voltammetry indicates that 1 to 4 are strong electron donors, reacting easily to radical cations or dications which with suitable acids have been obtained as salts.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 18
    Digitale Medien
    Digitale Medien
    Structural Characterization and Magnetic Behaviour of the Ferro-Antiferromagnetic Alternating Manganese-Azido Chain [Mn(3-Et,4-Mepy)2(μ-N3)2]n (3-Et,4-Mepy = 3-Ethyl-4-methylpyridine) (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 687-691 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Bridging ligands ; Manganese ; Azido bridge ; Alternating chain ; Magnetic properties ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The ligands 3-ethyl-4-methylpyridine (3-Et,4-Mepy) and azide coordinate to MnII forming an alternating chain with the formula [Mn(3-Et,4-Mepy)2(μ-N3)2]n. This compound crystallizes in the space group P-1. The compound consists of chains of octahedrally coordinated manganese atoms alternately bridged by double end-to-end (μ1,3) and double end-on (μ1,1) azido bridges, which results in a structurally and magnetically alternating chain. The 3-ethyl-4-methylpyridine ligands are arranged trans, completing the six-fold coordination spheres of the manganese atoms. The Mn-Mn distances are distinctly different: Mn(1)-Mn(1A) = 5.149(3) Å (double end-to-end azido bridge) and Mn(1)-Mn(1B) = 3.402(2) Å (double end-on azido bridge). The magnetic properties of the compound, as studied in the temperature range 300-4 K, show bulk antiferromagnetic interaction. Fitting of the magnetic data by using an equation for alternating ferro-antiferromagnetic S = 5/2 1-D systems gives the parameters JAF = -13.7(1) cm-1, JF = 2.4(1) cm-1, g = 2.036(2).
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 19
    Digitale Medien
    Digitale Medien
    On the Homoconjugation of Two Acceptor Groups (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1615-1623 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Homoconjugation ; Cyclovoltammetry ; ESR spectroscopy ; Diketones ; Heterocycles ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Cyclovoltammetric investigations have been carried out on 3,3,6,6-tetramethylcyclohexane-1,2,4,5-tetrone (4), bicyclo-[3.2.2]nonane-6,7,8,9-tetrone (5), and several of their congeners, such as 6,13-dihydro-6,6,13,13-tetramethylquin-oxalino[2.3-b]phenazine (13), 5,10-dihydro-5,5,10,10-tetra-methylpyrazino[2,3-g]quinoxaline (17), and 6,13-dihydro-6,13-propanoquinoxalino[2,3-b]phenazine (20). For 5 and 20 a large difference (ΔE° ≥400 mV) between the first and second reduction potentials was found. The ESR results of the radical anion 20•- are in support of a strong homoconjugation. ESR studies of 4•-, 13•-, and 17•- also reveal a symmetrical displacement of the unpaired electron over both acceptor groups on the ESR time scale which, however, based on the small potential difference ΔE° ≤ 200 mV can be most likely described to a fast electron exchange.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
  • 20
    Digitale Medien
    Digitale Medien
    Zur photometrischen Bestimmung von Brom als Tetrabromfluorescein (1956)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 149 (1956), S. 68-73 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Zusammenfassung Bei der objektiven photometrischen Brombestimmung mit der Fluoresceinmethode ist zur Erzielung genauer und reproduzierbarer Ergebnisse eine Reihe von Bedingungen genauestens einzuhalten. Die Bildung des Tetrabromfluoresceins ist außerordentlichph-abhängig. Ferner beeinflussen die Chloraminmenge und die Reaktionsdauer die Bildung des Farbstoffes so stark, daß zur Reagensabmessung Ausblaspipetten sowie genaues Einhalten der Zeit notwendig sind. Die Absorptionskurven von Fluorescein und Eosin liegen nahe beieinander, so daß die Extinktion des Reagensüberschusses mit in die Messung geht. Die Messung erfolgt bei 525 mμ in 20 mm-Küvetten.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00454147
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...