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  • 1
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    Selected papers in the hydrologic science 1984 (1984)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Details Availability
    Call number: SR 90.0004(2262)
    In: United States Geological Survey water-supply paper
    Pages: V, 66 S.
    Series Statement: U.S. Geological Survey water-supply paper 2262
    Language: English
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Wachstumstheorie (1998)
    München [u.a.] : Oldenbourg
    Details Availability
    Call number: PIK B 020-01-0496
    Type of Medium: Monograph available for loan
    Pages: VII, 216 S. , graph. Darst. , 24 cm
    Edition: 2., völlig überarb. Aufl.
    ISBN: 3486243322
    Series Statement: Oldenbourgs Lehr- und Handbücher der Wirtschafts- und Sozialwissenschaften
    URL: http://www.gbv.de/dms/hebis-mainz/toc/055618685.pdf
    URL: Inhaltsverzeichnis
    Parallel Title: 1. Aufl. u.d.T.: Müller-Siebers, Karl-Wilhelm: Wachstumstheorie
    Language: German
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
    Electronic Resource
    Electronic Resource
    Comment on "The weakest bond: Experimental observation of helium dimer'' [J. Chem. Phys. 98, 3564 (1993)] (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4021-4022 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recently, Luo et al. reported indirect evidence for the formation of dimers in a supersonic expansion of helium. They interpreted their data as confirmation of the existence of a bound state of 4He–4He with a binding energy of order 1 mK. We show that their data are actually consistent with the formation of helium trimers and not dimers. The two control experiments that they performed do not provide any evidence for discarding this alternative hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466338
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation and Expression of Two Genes Encoding Eukaryotic Release Factor 1 from Paramecium tetraurelia (2002)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 49 (2002), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Paramecium tetraurelia, like some other ciliate species, uses an alternative nuclear genetic code where UAA and UAG are translated as glutamine and UGA is the only stop codon. It has been postulated that the use of stop codons as sense codons is dependent on the presence of specific tRNAs and on modification of eukaryotic release factor one (eRFl), a factor involved in stop codon recognition during translation termination. We describe here the isolation and characterisation of two genes, eRF1-a and eRF1-b, coding for eRFl in P. tetraurelia. The two genes are very similar, both in genomic organization and in sequence, and might result from a recent duplication event. The two coding sequences are 1,314 nucleotides long, and encode two putative proteins of 437 amino acids with 98.5% identity. Interestingly, when compared with the eRFl sequences either of ciliates having the same variant genetic code, or of other eukaryotes, the eRFl of P. tetraurelia exhibits significant differences in the N-terminal region, which is thought to interact with stop codons. We discuss here the consequences of these changes in the light of recent models proposed to explain the mechanism of stop codon recognition in eukaryotes. Besides, analysis of the expression of the two genes by Northern blotting and primer extension reveals that these genes exhibit a differential expression during vegetative growth and autogamy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.2002.tb00215.x
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  • 5
    Electronic Resource
    Electronic Resource
    Eddy current shielding and heating: Reduction of dissipation for very low-temperature experiments in the presence of magnetic field ripple (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2964-2968 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have studied eddy current heating and shielding for conducting materials in a cylindrical geometry, and we have performed numerical calculations as a function of the important parameters. Results are presented in graphical form. Eddy current heating in OFHC copper at low temperatures and means of suppressing it have been studied in a Bitter magnet in a field of 15 T. Results show that it is possible to use conducting materials for experiments in high magnetic fields at temperatures below 1 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140636
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  • 6
    Electronic Resource
    Electronic Resource
    Epigenetic Regulation of Programmed Genomic Rearrangements in Paramecium aurelia (1996)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 43 (1996), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In ciliates, development of the polyploid somatic macronucleus after sexual events involves extensive and reproducible rearrangements of the germ-line genome, including chromosome fragmentation and precise excision of numerous internal sequence elements. In Paramecium aurelia, alternative macronuclear versions of the same germ-line genome can be maternally inherited across sexual generations, showing that rearrangement patterns are not strictly determined by the germ-line sequence. Homology-dependent maternal effects can be evidenced by transformation of the vegetative macronucleus with cloned macronuclear sequences: new fragmentation patterns or internal deletions are specifically induced during differentiation of a new macronucleus, in sexual progeny of transformed clones. Furthermore, transformation of the maternal macronucleus with germ-line sequences containing internal eliminated sequences (short single-copy elements) can result in a specific inhibition of the excision of the same elements in the zygotic macronucleus. These experiments show that the processing of many germ-line sequences in the developing macronucleus is sensitive to the structure and copy number of homologous sequences in the maternal macronucleus. The generality and sequence specificity of this trans-nuclear, epigenetic regulation of rearrangements suggest that it is mediated by pairing interactions between germ-line sequences and sequences imported from the maternal macronucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1996.tb04504.x
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  • 7
    Electronic Resource
    Electronic Resource
    From Landgrabbing to Landhunger: High Land Appropriation in the Plantation Areas of Sri Lanka during the British Period (1992)
    Cambridge : Cambridge University Press
    Modern Asian studies 26 (1992), S. 321-361 
    Details
    ISSN: 0026-749X
    Source: Cambridge Journals Digital Archives
    Topics: Ethnic Sciences , History , Political Science , Economics
    Notes: In this contribution I propose to examine an aspect of Sri Lankan agrarian history which is often alluded to but rarely studied in depth: the process of high land appropriation for the development of coffee, tea, rubber and coconut plantations. The development of a land market in the Indian subcontinent is becoming a promising field of research for the study of imperial impact as a process at work in specific contexts.The Sri Lankan case differs from the Indian one in that land appropriation was originally meant for and followed by large scale land alienation to outsiders–the planters. This process has attracted the interest of most historians writing on the history of the Raj in Ceylon, but usually the only aspect stressed has been the appropriation by the Colonial State of forest and chena(land devoted to slash-and-burn cultivation) for sale to British planters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0026749X0000980X
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  • 8
    Electronic Resource
    Electronic Resource
    Photoreceptor design and optical properties affecting polarization sensitivity in ants and crickets (1987)
    Springer
    Journal of comparative physiology 161 (1987), S. 645-658 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Anatomically and physiologically specialized ommatidia at the dorsal rim of insect compound eyes play a key role in polarization vision. In this eye region the polarization sensitivity (PS) of photoreceptors is significantly higher than elsewhere in the eye. We have compared the optical properties of the dorsal rim area and normal eye region of desert ants,Cataglyphis bicolor, and field crickets,Gryllus campestris. The objective was to find the cause of the enhanced PS in the dorsal rim area of eyes where the situation is not complicated by rhabdom twist. Three pieces of information were derived: 1. From qualitative optical experiments we conclude that rhabdom waveguide effects do not enhance or reduce PS. Quantitative measurements of depolarization in the retina demonstrate unambiguously that all parts of the eye retain the state of polarization very well through the full retinal depth. The factor limiting inherent PS of receptor cells must thus be the dichroic absorption of the rhabdomeres, which is determined by the dichroic ratio of microvilli and the degree of microvillar alignment. 2. A theoretical model of light propagating in a dichroic rhabdom reveals a strong influence of random microvillar misalignment on PS. Using measured values of misalignment, we predict differences in PS between dorsal rim and unspecialized retina that explain previous electrophysiological results. 3. Theoretical modelling also demonstrates the advantage of having a predominant microvillar direction in a rhabdom (as is the case in theCataglyphis dorsal rim).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605006
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  • 9
    Electronic Resource
    Electronic Resource
    Rhabdomeric twist in bees — Artefact or in vivo structure? (1981)
    Springer
    Journal of comparative physiology 142 (1981), S. 1-17 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It has recently been claimed (Ribi 1979, 1980) that “bee ommatidia show no twist” and that our earlier finding of rhabdom twist in bees (Wehner et al. 1975; forMyrmecia ants see Menzel and Blakers 1975) had been due toartefactual twisting of the rhabdoms. In this paper we present new histological data substantiating our previous hypothesis that bee rhabdoms twist in vivo. In addition, we demonstrate that Ribi's longitudinal section (Ribi 1979; Fig. 1) through part of a bee's rhabdom does not provide compelling evidence against the hypothesis of rhabdomeric twist. 1. Rhabdomeric twist is found in preparations in which special care was taken not to cut the eye (glutar-aldehyde fixation) or even the whole head (acrolein fixation) during the processes of preparation and fixation. Thus, changes in intraocular pressure that might be one cause of artefactual twist have been reduced to a minimum in both the whole-eye and the whole-head preparations. On the other hand, even when the retinal tissue is mechanically manipulated, e.g. by compressing the compound eye or by excising the retina, the rhabdoms twist as in the usual preparations. The direction of twist (clockwise or counter-clockwise) is always correlated with the geometry of the rhabdom (X-type rhabdoms or Y-type rhabdoms). The twist rate is about the same in the whole-eye preparations, the manipulated-eye preparations, and the isolated-retina preparations. Besides the absence of structural pecularities like disrupted membranes or enlarged intercellular clefts, there is some further support for the hypothesis that artefactual twist does not occur: Slender processes of the secondary pigment cells invade the intercellular clefts between adjacent photoreceptor cells but never show any signs of being sheared off or distorted. Furthermore, membrane junctions can regularly be found between secondary pigment cells belonging to different retinulae. 2. Ribi's (1979) electron micrograph presenting a relatively short longitudinal section through a bee's rhabdom does not allow for the conclusion that the rhabdoms of bees are straight. This is mainly a consequence of the fact that the section of the rhabdom shown in his figure was cut at about right-angles to its microvilli instead of parallel to them. It follows from simple geometrical considerations that the cut microvilli can appear rather circular even in the presence of substantial amounts of twist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00605471
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  • 10
    Electronic Resource
    Electronic Resource
    Does Paramecium primaurelia use a different genetic code in its macronucleus? (1985)
    [s.l.] : Nature Publishing Group
    Nature 314 (1985), S. 185-188 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The G surface antigen is one of the set of surface antigens expressed by P. primaurelia in a mutually exclusive manner6'7. It is a highly abundant protein covering the whole surface of the cell, and comprises a unique polypeptide chain of relative molecular mass 250,000-300,000 (refs 8, 9). Its ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/314185a0
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