ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    Call number: 12/M 93.0761 ; 12/M 93.1035 ; 12/M 94.0327 ; 12/M 98.0138 ; AWI A3-93-0215
    In: NATO ASI Series
    Type of Medium: Monograph available for loan
    Pages: 265 S.
    ISBN: 3540545913
    Series Statement: NATO ASI series : I, Global and environmental change 6
    Classification: D.4.
    Language: English
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Location: Reading room
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: GFZ Library
    Branch Library: AWI Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Call number: PIK M 370-92-0645
    In: Developments in environmental modelling
    Type of Medium: Monograph available for loan
    Pages: XXI, 254 S. : graph. Darst.
    ISBN: 0444428070
    Series Statement: Developments in environmental modelling
    Branch Library: PIK Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary It is proposed that the grouping of unicellular forms of bacteria into clusters or colonies may be the first step in the evolution of multicellular forms and that any further evolutionary advance would require the subordination of the impulses of the individual in favour of the needs of the “colony”. This latter relationship is exemplified by the group movement of certain aerobic sporeforming bacilli. A description of the nature of this movement on the surface of nutrient agar has been made. Studies on 54 strains showing this group movement reveal that they taxonomically constitute a nebulous group in Morphological Group II of the genus Bacillus according to the presently accepted system of classification (Bergey's Manual 1957). While the large majority of the strains studied morphologically resemble B. alvei, none exhibit the typical physiological characteristics of this species. Considering all the characteristics studied, the strains in our collection could be placed in an indefinite group comprising B. alvei, B. circulans, B. laterosporus and B. pulvifaciens. This however does not reflect any marked dissimilarities between the strains studied but rather the unsatisfactory taxonomy of the species enumerated. A re-examination of the determinative classification of these four species especially with reference to the unsatisfactory use of starch hydrolysis in the key to the genus is suggested.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1434-4475
    Keywords: Dielectric constants ; Ionization constants ; Mixed solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen Protonen-Dissoziationskonstanten (TpKa) von Benzoylaceton (HBA) und Isonitrosobenzoylaceton (HINBA)pH-metrisch in 10–50% (v/v) Dioxan-Wasser-Mischungen bei 25 und 35 ± 0.01°C bestimmt, wobei eine empirischepH-Korrektur für das gemischt-wäßrige Medium angewendet wurde. DiepKa-Werte in wäßrigem Medium (0% Dioxan) folgen aus der Extrapolation und der Methode kleinster Fehlerquadrate. SowohlHBA als auchHINBA sind sehr schwache monoprotische Säuren mitTpKa zwischen 7.0 und 10.0. DieTpKa's variieren nicht linear mit der reziproken Dielektrizitätskonstante des Mediums, ein DiagrammTpKa gegen Molenbruch Dioxan ergibt jedoch für eine konstante Temperatur eine Gerade. Die „wahre Konstante“Ka' und die Solvatationszahln des Ausdrucks (H+)(A −)/(HA)=Ka'(S) n =Ka* wurde aus den experimentellen Daten für beide Reagentien errechnet. Die thermodynamischen Parameter ΔG°, ΔH° und ΔS° wurden ebenfalls bestimmt, Temperatur- und Lösungsmitteleffekte werden diskutiert.
    Notes: Abstract Thermodynamic proton dissociation constants,TpKa of benzoylacetone(HBA) as well as isonitrosobenzoylacetone (HINBA) have been determinedpH-metrically in 10–50% (v/v) dioxane-water mixtures at 25 and 35±0.01°C applying an empiricalpH correction for mixed aqueous media. ThepKa's in aqueous medium (at 0% dioxane) are obtained following the method of extrapolation and least-squares. BothHBA andHINBA are very weak monoprotic acids withTpKa between 7.0 and 10.0.TpKa's do not vary linearly with the reciprocal of the dielectric constant of the medium, but a plot ofTpKa vs. the mole fraction of dioxane is linear at a given temperature. The “true constant”Ka' and solvation number,n, in the expression (H+)(A −)/(HA)=Ka' (S) n =Ka* for these reagents have been evaluated by analysing the experimental data mathematically. Values of ΔG 0, ΔH 0, and ΔS 0 are also computed. Temperature and medium effects are briefly discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1434-4475
    Keywords: Complexation ; Formation constant ; Lanthanons ; β-Ketoesters ; Activity coefficients ; Speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen stufenweisen Komplexbildungskonstanten (log T K n) von 9 dreiwertigen Lanthanoiden (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ und Lu3+) mit drei fluorierten β-Ketoestern (Methyltrifluoracetoacetat, Ethyltrifluoracetoacetat und Ethylpentafluopropionylacetat) in 50% Dioxan-Wasser bei 25 und 35±0.01 °C potentiometrisch bestimmt. Die Werte für log T K n ergeben keine lineare Abhängigkeit gegenüberZ/r, sie gehorchen stets der Reihenfolge: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+. Die thermodynamischen Standardparameter ΔG 1 0 , ΔH 1 0 und ΔS 1 0 wurden ebenfalls berechnet. Die Gültigkeit des gewählten Gleichgewichtsmodells wurde unter Verwendung der Summe der Quadratreste (S min), von Streukurven und Steigung/Ordinatenabschnitt der Normalwahrscheinlichkeitsdarstellung nach Abrahams-Kave untersucht.
    Notes: Summary The thermodynamic stepwise formation constants (log T K n) of nine tervalent lanthanons (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ and Lu3+) with three fluorinated β-ketoesters (methyltrifluroacetoacetate, ethyltrifluoroacetoacetate, and ethylpentafluoropropionylacetate) have been evaluated potentiometrically in a 50% dioxane-water mixture at 25 and 35 ± 0.01 °C. The values of log T K n do not follow a linearity when plotted againstZ/r and invariably obey the sequence: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+ in all instances. The standard thermodynamic parameters (ΔG 1 0 , ΔH 1 0 , ΔS 1 0 ) associated with log T K n have also been calculated. The validity of the chosen equilibrium model was examined by an error analysis usingS min values (sum of the squared residuals), scatter plots, and slopes and intercepts of Abrahams-Kave type normal probability plots.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 115 (1977), S. 1449-1461 
    ISSN: 1420-9136
    Keywords: Monsoon ; Mean zonal wind ; Barotropic-baroclinic instability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Barotropic-Baroclinic instability of horizontally and vertically shearing mean monsoon flow during July is investigated numerically by using a 10-layer quasi-geostrophic model. The most unstable mode has a wavelength of about 3000 km and westward phase speed of about 15 m sec−1. The most dominant energy conversion is from zonal kinetic energy to eddy kinetic energy. The structure of the most unstable mode is such that the maximum amplitude is concentrated at about 150 mb and the amplitude at the lowest layers is negligibly small. Barotropic instability of the zonal flow at 150 mb seems to be the primary excitation mechanism for the most unstable mode which is also similar to the observed westward propagating waves in the upper troposphere during the monsoon season. The results further suggest that Barotropic-Baroclinic instability of the mean monsoon flow cannot explain the occurrence of monsoon depressions which have their maximum amplitude at the lower levels and are rarely detected at 200 mb.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 16 (1960), S. 202-203 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Du jus de canne à sucre, les auteurs ont extrait un enzyme, le sucrose phosphorylase, qui diffère des enzymes tirés jusqu'ici dePseudomonas saccharophilia par certaines propriétés caractéristiques. La présente note étudie ces propriétés et donne la détermination de leurs constantes physiques.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A highly sensitive and rapid method has been developed for the extraction-spectrophotometric determination of ultra trace amounts of americium. Americium(III) is selectively extracted from 1–10M HNO3 medium with a mixture of (0.3M HDEHP+0.1M P2O5), both dissolved in xylene, and finally estimated in the organic phase itself absorptiometrically employing Arsenazo-III as the chromogenic reagent. A 60% dioxaneethanol mixture was used for optium colour development. Beer's law is obeyed in the concentration range 0.1–0.7 μg Am cm−3 and as little as 0.11 μg Am cm−3 could be determined with a precision better than ±2%. The molar absorptivity based on Am content is (3.599±0.049)·105 dm3·mol−1·cm−1 at 648 nm which is incidentally the highest value reported as yet for its determination. The optimum concentration range, evaluated by Ringbom's method is 0.1–0.6 ppm Am. Common contaminants such as Al3+, Co2+, Cr3+, Fe3+, Ni2+, Zr4+, F−, NO3 −, and SO 4 2- in fairly large quantities and moderate amounts of Pu4+, Th4+ and UO 2 2+ cause no interference in the final assay. Colour development is almost instantaneous and its intensity remains virtually constant for at least 48 hours.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extractive properties of tri-isoamyl-phosphate (TAP), an indigenously prepared extractant, and the loading capacity of extraction solvent containing TAP for U(VI) and Pu(IV) ions in nitric solution have been investigated. The dependence of the distribution ratio on the concentration of nitric acid showed that TAP has an ability to extract these actinides, while the fission product contaminants are poorly extracted. The distribution data revealed a quantitative extraction of both U(VI) and Pu(IV) from moderate nitric acidities in the range 2–7 mol · dm−3. Slope analysis proved predominant formation of the disolvated organic phase complex of the type UO2(NO3). 2TAP and Pu(NO3)4·2TAP with U(VI) and PU(IV), respectively. On the contrary, the extraction of fission product contaminants such as144Ce,137Cs,9Nb.,147Pr,106Ru,95Zr was almost negligible even at very high nitric acid concentrations in the aqueous phase indicating its potential application in actinide partitioning. The recovery of TAP from the loaded actinides could be easily accomplished by using a dilute sodium carbonate solution or acidified distiled water (≈0.01 mol · dm−3 HNO3) as the strippant for U(VI) and using uranous nitrate or ferrous sulphamate as that for Pu(IV). Radiation stability of TAP was adequate for most of the process applications.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The colour reaction of Am(III) with Arsenazo III in several hydroorganic media has been examined systematically on the addition of certain polar water-miscible organic solvents in the course of a search for improved and simple spectrophotometric methods for the estimation of americium. Addition of these substances resulted in the stabilization of colour and brought about a drastic enhancement in the absorbance values. The organic additives studied include acetone, acetonitrile, dimethylformamide, dioxane and ethanol. Among the many solvents tested, alcohol and dioxane proved to be the most effective; highest sensitivity is obtained by using a 60% dioxane-ethanol (1∶1) mixture. The apparent molar absorptivity based on Am content is 184616±9931 mol−1 cm−1 at 655 nm which is about 3 times that attained for the reaction in aqueous medium (65178±1243). Strikingly, this is the highest value reported as yet for its determination. Beer's law is obeyed both in mixed as well as aqueous media. The effects of some experimental variables on colour development have also been studied to optimize the conditions for the assay of Am.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...