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
    Rapid double bond shift in a donor-acceptor substituted cyclobutadiene. Evidence from 584-Ang and x-ray photoelectron spectroscopy (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 8479-8481 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00806a063
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Results of the UNDP (SF)/FAO regional fisheries survey in West Africa. Report No. 1. Deep-scattering Sardinella aurita off Mauritania (1972)
    Springer
    Marine biology 16 (1972), S. 91-101 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Scattering layers beyond the Continental Shelf, in deep water, were often observed during cruises with the charter vessel of the Regional Fisheries Survey in West Africa. The layers were located at depths of 100 to 350 m during daytime; at night, they generally ascended to the surface. They consisted mainly of myctophids and small squids. In this report, results of first observations on deep-scattering layers of Sardinella aurita (Cuv. et Val.) are given. The layers occurred off Mauritania during the months of hydrological transition, characterized by low water-temperatures. In these months, S. aurita were rarely caught over the shelf. Apparently, they migrate north and south in deep water, and were not detected by commercial vessels. The environmental conditions and the difficulties for the industrial fishery during this transitional period are briefly described. the temporal and spatial occurrence of deep-scattering S. aurita is given, and diurnal vertical migrations are shown, together with examples of echo records. Results of fishing operations made in the layer, and some biological observations on S. aurita are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347946
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Bestimmung von Stoßfrequenz und Stoßmodell in verschiedenen Flammenplasmen aus Absorption und Dispersion von Mikrowellen (1970)
    Springer
    The European physical journal 234 (1970), S. 82-94 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electron collision frequencies for four flames of different temperature and composition have been determined by means of measuring simultaneouslyX-band microwave attenuation and phase shift, which originate from the complex conductivity of the flame plasma. Hence the method can also be used for the determination of the collision frequencies of time dependent plasmas. In order to enhance the small magnitude of the quantities to be measured one hundred equal flames burnt inside the waveguide. The measurements show: 1 In flames collisions of electrons with induced dipoles dominate (Lorentz-theory). 2 The collision frequencies depend on the flame temperatureand on the chemical composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392500
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Temperature dependence of phytochrome dark reactions (1974)
    Springer
    Planta 116 (1974), S. 257-266 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The dark reversion and the destruction reaction of the phytochrome of squash (Cucurbita pepo L.) cotyledons show different temperature behaviour in the temperature range 15–35°. The Arrhenius activation energy of the destruction reaction is temperature independent whereas that of the reversion reaction shows a jump at 20°. This indicates an interaction of phytochrome molecules with membranes. A reaction scheme is discussed which can explain the differences of the dark kinetics in a quantitative manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390231
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Phytochrome: First-order phototransformation kinetics in vivo (1973)
    Springer
    Planta 111 (1973), S. 329-336 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The deviation from first order commonly observed in phototransformation kinetics of phytochrome in vivo is due to a light-intensity gradient within the sample. This gradient was measured and was found to approach that predicted by the Kubelka-Munk theory of light scatter in turbid materials. The influence of this gradient is eliminated and first-order phototransformation kinetics are obtained, when either (i) thin samples of translucent (low optical density) material of high phytochrome content are measured directly; or (ii) thin samples of opaque (high optical density) or translucent material are sandwiched between two layers of light-scattering material. This result is consistent with the existence of only one population of photoreversible phytochrome molecules in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385552
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Changes of the synaptonemal complex at the end of pachytene (1973)
    Springer
    Human genetics 〈Berlin〉 19 (1973), S. 235-245 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Beobachtungen über die Veränderungen des synaptonemalen Komplexes am Ende des Pachytäus und im Diplotän werden mitgeteilt. Im Diplotän löst sich der synaptonemale Komplex durch fortschreitende Trennung der lateralen Arme. Die Strukturen des Paarungs-Raumes verschwinden. Ein Rest des synaptonemalen Komplexes wird als Übergangsstadium im Laufe des Desintegrations-Prozesses gedeutet. Die lateralen Arme bilden Einzelstränge, die am Ende des Diplotäns verschwinden. Eine Verdopplung des lateralen Armes kann nicht entdeckt werden; lediglich in der Nähe des Fixationspunktes an der Nuclearmembran findet sich eine Aufspaltung in 3–4 Lamellen. Am Ende der meiotischen Prophase trenne sich demnach die lateralen Arme nicht in Untereinheiten. Chiasmata sind nicht erkennbar.
    Notes: Summary Observations on the changes of the synaptonemal complex at the end of pachytene and in diplotene are reported. The synaptonemal complex disintegrates in diplotene by progressive disjoining of the lateral arms. The structures of the pairing space disappear. A residual piece of the synaptonemal complex is interpreted as a transitional stage of the process of disintegration. The lateral arms form single threads which disappear at the end of diplotene. No doubleness of the lateral arms can be detected, except a splitting in 3–4 laminae in the region near the fixation points at the nuclear envelope. The lateral arms do not separate in subunits at the end of the meiotic prophase. Chiasmata can not be recognized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278396
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    The local control of mammalian spermatogenesis (1973)
    Springer
    Human genetics 〈Berlin〉 19 (1973), S. 75-98 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Untersuchungen der Ultrastruktur der Spermatogenese der Säuger haben intercelluläre Brücken in allen Zellgenerationen des Keimepithels ergeben. Desmosomen verbinden die Sertolizellen untereinander (Sertolizelle — Sertolizell-Verbindungen) und mit den benachbarten Zellen des Keimepithels. Um die verschiedenen Formen von Zellverbindungen in allen Entwicklungsstadien der Spermatogenese nachzuweisen, mußten die unterschiedlichen Zellgenerationen bestimmt werden. Dies wurde erreicht durch Beachtung der Morphologie der Zellkerne und durch die Zuordnung der Zellen zu den Zellassoziationen, in welchen sie beobachtet wurden. Diese Beobachtungen führten uns zu einer Hypothese, durch die die lokale Steuerung der Spermatogenese erklärt wird. Nach dieser Hypothese sind alle Zellen eines Entwicklungsstadiums innerhalb einer Zellassoziation durch intercelluläre Brücken verbunden. Hierdurch wird ein Syncytium gebildet, welches jeweils gesamte Zellschichten einer Zellassoziation umfaßt. Auf diese Weise wird die synchrone Entwicklung innerhalb der Zellschichten erklärt. Die Koordination der Entwicklung von verschiedenen Zellschichten einer Zellassoziation wird durch Sertolizellen bewirkt. Um diese Organisation des Spermatogenesecyclus zu erreichen, muß die Zellpopulation einer Zellassoziation von einer gemeinsamen embryonalen Stammzelle abstammen. Die Evidenz für diese Hypothese wird diskutiert.
    Notes: Summary Investigations of the ultrastructure of mammalian spermatogenesis have revealed intercellular bridges in all cell generations of the germinal epithelium. Desmosomes connect Sertoli cells with associated Sertoli cells (Sertoli cell — Sertoli cell junction) and with adjacent cells of the germinal epithelium. To provide evidence for the different types of cell connections in all developmental stages of spermatogenesis the various cell generations had to be worked out. This was achieved by considering the morphology of the nuclei and the relation of the cells to cell associations of the spermatogenic cycle in which they have been observed. These observations led us to a hypothesis explaining the local control of the spermatogenic cycle. According to this hypothesis all cells of one developmental stage within a given cell association are interconnected by intercellular bridges, thus forming a syncytium which contains each complete layer of a cell association. This explains the synchronous development of the cell layers. The coordination of the development of different layers of one cell association is effected by Sertoli cells. To achieve this organization of the spermatogenic cycle the entire cell population of one cell association has to be derived from one common embryonic stem cell. The evidence for this hypothesis is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295237
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Dependence of phytochrome dark reactions on the initial photostationary state (1974)
    Springer
    Planta 116 (1974), S. 267-272 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Under conditions of continuous irradiation, the P jr destruction rate constants (k d ) of phytochrome in hooks and cotyledons of squash (Cucurbita pepo L.) seedlings do not depend on the photostationary state ϕλ and are the same in both organs. On the other hand, the rate constants of the dark reversion and the first destruction step, plotted as a function of ϕ λ 0 , show optimum curves with maxima between ϕ λ 0 and 0.5. Similar results were obtained for dark reactions of mustard (Sinapis alba L.)-hook phytochrome in vivo. This indicates a cooperative behaviour of these phytochrome dark reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390232
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Recensiones (1974)
    Springer
    Theoretical chemistry accounts 34 (1974), S. 91-92 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553237
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Holographic contour mapping using a dye laser (1973)
    Springer
    Applied physics 1 (1973), S. 103-109 
    Details
    ISSN: 1432-0630
    Keywords: Holographic interferometry ; Dye laser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Narrow depth contour lines with variable depth distance were generated, using a multiple-frequency cw-dye laser. The feasibility of extending contour mapping with dye lasers to very large objects is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00887073
    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...