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  • 1
    Series available for loan
    Series available for loan
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Call number: SR 90.0002(403-H)
    In: Professional paper
    Type of Medium: Series available for loan
    Pages: IV, H-28 S. + 1 pl.
    Series Statement: U.S. Geological Survey professional paper 403-H
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 6 (1967), S. 1854-1863 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 205 (1965), S. 327-328 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] VARIOUS proposals have been considered for the detection of large cosmic-ray air showers by radio techniques. Neither the original proposal of pulse radar1 nor the passive detection of ?erenkov radiation at microwave frequencies2 now appears to be feasible. A reassessment of the possibilities of ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 19 (1969), S. 615-620 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 220 (1968), S. 1228-1229 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experimental arrangement which has been found most useful for the present application is shown in Fig. 1. A ruby laser with vanadyl phthalocyanine Q switch delivers a pulse which is frequency doubled by an ADPH crystal, filtered to reduce red light and light scattered from the flash lamp, and ...
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 1348-1349 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The system used was a modified version of that described before5. Four f/2 mirrors 90 cm in diameter were mounted with their axes parallel on a steerable altazimuth mounting and viewed with fast photomultipliers using 0.49 half field of view. The photomultiplier signals were amplified, clipped to ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 206 (1965), S. 1355-1356 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have found evidence for the photo-ionization of toluene, phenol, aniline, naphthalene, phenanthrene, fluorene, diphenyl methane, perylene and biphenyl in 3-methyl pentane (3 MP) at 77 K on irradiation by ultra-violet light at 2537 A. Concentrations were in the region of 102103 M and the ...
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The dermal melanophores ofFundulus heteroclitus L. have been investigated by light and electron microscopy with the purpose of revealing the mechanisms controlling pigment migration. As predicted by earlier studies, the nerve endings of a double innervation were found adjacent to and in synaptic relation to the melanophore surface. Not expected were the large number of small pits or invaginations present in the cell surface. These appear identical to the so-called micropinocytotic vesicles found generally in cells of the vascular endothalium and smooth muscle. In chromatophores they are more reasonably interpreted as receptor sites for neurohormones than as uptake and transport mechanisms. Observations made on the kinetics of pigment migration within the processes of these melanophores indicate that the granules move along relatively fixed channels arranged parallel to the long axes of the processes. Examined at fine structure levels, the zones of cytoplasm around these channels are found to be populated by microtubules about 225 Å in diameter aligned parallel to the direction of pigment movement. These long slender elements are present in the processes regardless of whether the melanin is concentrated in the cell center or dispersed. It is reasoned from these and other observations that the microtubules function as cytoskeletal elements which help maintain the extended form of the melanophore arms and at the same time define the channels in which the pigment moves. The possible role of the tubule in generating the motive force for pigment migration is discussed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 64 (1967), S. 349-380 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary By a combined light and electron microscopic study, the structure and behavior of the stress fibers of cultured rat embryo cells are described. From an analysis of movie records of living cells it is seen that the stress fibers are in a state of flux, continually altering their dimensions and dispositions within the cell. However, compared to most other cellular movements, these rates of change are slow. By electron microscopy it is shown that the stress fibers consist of bundles of close packed elongate 75 Å filaments, arranged just beneath the plasma membrane adjacent to the cell's plane of attachment and that similar filaments, forming a loose framework, permeate the cytoplasmic matrix. On the basis of careful light and electron microscopic comparisons, it is concluded that the filamentous structure shown within the cytoplasm of glutaraldehyde/osmium-fixed cells is a generally accurate representation of the structure of the living cell cytoplasm. It seems likely that the stress fibers are concerned in stabilizing areas of cellular attachment as well as with resisting forces that stretch the cell. The suggestion is made that, by controlling cytoplasmic viscosity and responding to cytoplasmic microtubules, the diffuse framework of filaments helps to determine the form of the cell and that, by a coordinate dynamic activity of its filaments, it provides the motive power for the various forms of cellular and intracellular movements.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 67 (1969), S. 1-19 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Electron microscopic observations of the vegetative colony ofLabyrinthula clearly show that the “slimeways”, along which the cells glide, are extracellular and completely surround the cells. Membranes of this extracellular matrix have a trilaminar, unit membrane structure that is characteristic of the plasma membrane. The Golgi complex of the cells probably consists of two large dictyosomes. A membrane-limited bundle of parallel filaments of unknown function is usually adjacent to one dictyosome. Specialized invaginations of the plasma membrane, called bothrosomes, may be sites of membrane assembly and secretion of the “slimeway” matrix, the prerequisite substratum for the gliding cell movement.
    Type of Medium: Electronic Resource
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