Library

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
    Correlation between far-red absorbing phytochrome and response in phytochrome-mediated anthocyanin synthesis (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 2 (1979), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Mustard seedlings were light treated at 24 h after sowing (25°C) to induce phytochrome-mediated anthocyanin synthesis in cotyledons and hypocotylar hook. All light treatments were performed within the range of the reciprocity law. The in situ photoconversion kinetics of phytochrome (Pr→ Pfr) were measured under the same light treatment. It was found that between 0.4 and 1.0 relative Pfr level the amount of anthocyanin extracted from the organs at 52 h after sowing was linearily correlated with the amount of Pfr produced at 24 h in cotyledons and hypocotylar hook. It is concluded that an explanation of the fluence response function for red light mediated anthocyanin synthesis in the mustard seedling does not require the concept of active vs. bulk phytochrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1979.tb00788.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Frühe akustisch evozierte Potentiale (FAEP) — eine Methode zur Früherfassung des Akustikusneurinoms (1979)
    Springer
    European archives of oto-rhino-laryngology and head & neck 223 (1979), S. 297-298 
    Details
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Acoustic neuromas originate from the vestibular part of the eighth cranial nerve and result early in an impairment of hearing as a result of compression caused by the tumor. This produces changes in the components I and II of the potentials, allowing an early diagnosis of such tumors. The potentials obtained after stimulation of the non-tumorous ear show alterations in brainstem compression caused by abnormal tumor growth and in intracranial pressure. The reliability of the EAEP method in diagnosing these tumors is demonstrated by comparing this method with classical examinations such as audiometry, testing the vestibular nerve and x-ray films according to Stenvers. The reproducibility of these potentials, which have a very low amplitude, can be considerably improved by means of sinusoidal stimulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01109552
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Fluorescence studies of electron-beam pumped POPOP dye vapor (1976)
    Springer
    Applied physics 9 (1976), S. 143-146 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Fluorescence studies on electron-beam excited mixtures of POPOP dye vapor and various buffer gases are reported. Xenon has been found to be a promising candidate as a buffer gas for efficient energy deposition of the electron-beam and energy transfer to the POPOP dye vapor. These experiments may be an important step towards realization of an electrically excited dye vapor laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00903950
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Distorted phytochrome action spectra in green plants (1978)
    Springer
    Planta 138 (1978), S. 25-28 
    Details
    ISSN: 1432-2048
    Keywords: Action spectrum ; Chlorophyll ; Phaseolus ; Photomorphogenesis ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Red light absorption by photosynthetic pigments screens stem tissue of Phaseolus vulgaris L. seedlings to such an extent that the most effective wavelength for the phytochrome induction control of stem growth is approximately 628 nm. Screening is greater in the first internode than in the hypocotyl. The consequences are that, compared with etiolated seedlings, much higher irradiances are required for phytochrome control in green plants, and the efficiency of 660 nm light is markedly reduced. Even very high exposures at 660 nm may not achieve appreciable photoconversion of P r to P fr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392909
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Control by light of hypocotyl growth in de-etiolated mustard seedlings (1978)
    Springer
    Planta 141 (1978), S. 211-216 
    Details
    ISSN: 1432-2048
    Keywords: Hypocotyl growth ; Photomorphogenesis ; Phytochrome ; Sinapis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After sowing, mustard (Sinapis alba L.) seedlings were grown for 48 h in white light (25°C). These fully de-etiolated, green seedlings were used as experimental material between 48 and 72 (84) h after sowing. The question researched was to what extent control by light of hypocotyl elongation is due to phytochrome in these seedlings. It was found that the light effect on hypocotyl growth is very probably exerted through phytochrome only. In particular, we found no indication for the involvement of a specific blue light photoreceptor pigment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387891
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Control by light of hypocotyl growth in de-etiolated mustard seedlings (1978)
    Springer
    Planta 141 (1978), S. 217-223 
    Details
    ISSN: 1432-2048
    Keywords: Hypocotyl growth ; Sensitivity for Pfr ; Photomorphogenesis ; Sinapis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract After sowing, mustard (Sinapis alba L.) seedlings were grown for 48 h in white light (25°C). These fully de-etiolated, green seedlings were used as experimental material between 48 and 72 h after sowing to study the control by phytochrome (Pfr) of hypocotyl elongation after a white light→dark transition. It was found that the transfer to darkness leads to a complete loss of sensitivity towards newlyformed Pfr for a period of 12 h while the effectiveness of the Pfr, which was established at the end of the 48 h white light pretreatment was maintained. It is concluded that two kinds of Pfr must be kept apart: “old” Pfr which operates during the first 12 h after the light→dark transition and “new” Pfr the appearance of which is totally ignored by the plant. Between 12 and 24 h after the white light→dark transition the sensitivity of the seedling towards “new” Pfr is restored while an effect of the “old” Pfr is no longer detectable. The restoration process is accelerated by light which operates through phytochrome (“positive feedback”). The implications of these findings for plant growth under natural light/dark regimes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387892
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Red/far-red modulation in vitro of enzyme activity in a membrane fraction from Phaseolus aureus (1979)
    Springer
    Planta 146 (1979), S. 75-81 
    Details
    ISSN: 1432-2048
    Keywords: Adenosine-5′-triphosphate ; Membrane ; Phaseolus ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a membrane fraction isolated from hypocotyls of Phaseolus aureus Roxb. the activity of a number of enzymes was regulated by red and far-red irradiation in vitro, provided that the tissue received a brief red light treatment before extraction. Other enzymes showed no photoregulation. There were two types of photocontrol, neither of which could be detected in the solute fraction, nor in extracts from completely etiolated material. One (Type I) was a red/far-red reversible regulation of the rate of enzyme activity, depending on the light given (in vivo or in vitro) before the assay was begun. The second (Type II) was a promotion of enzyme activity by red or far-red light given during the assay. The action spectra for type II responses do not coincide with either the phytochrome absorption or difference spectra. However, the effectiveness of red and far-red was correlated with the Pfr/P ratio present at the beginning of the assay, such that far-red was more efficient at high Pfr/P and red at low Pfr/P ratios. All enzymes that were regulated involved ATP. In samples that showed enzyme regulation, small changes in fluorescence yield of tryptophan and the covalent probe “Fluram” (Roche) accompanied the photoconversion of phytochrome, but no fluorescence changes could be measured after briefly incubating the membrane fraction with ATP. The results indicate that light may affect the interaction of ATP with the membrane fraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381258
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Digitaliswirkung auf die Extremitätendurchblutung des Menschen (1978)
    Springer
    Journal of molecular medicine 56 (1978), S. 515-519 
    Details
    ISSN: 1432-1440
    Keywords: Lanatosid C ; Vascular effect ; Peripheral flow ; Peripheral vascular resistence ; Lanatosid C ; Gefäßwirkung ; Periphere Durchblutung ; Periphere vaskuläre Resistenz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Anhand eines gekreuzten Doppelblindversuchs wurde die Gefäßwirkung von 1 mg Lanatosid C geprüft, welches 6 gesunden Probanden in 30 min intravenös appliziert wurde. Während unter der Infusion von physiologischer Kochsalzlösung keine signifikanten Änderungen der haemodynamischen Parameter eintrat, war bei Digitalisgabe eine Abnahme des Ruhestromvolumens der unteren Extremität und eine Erhöhung des peripheren Gefäßwiderstandes zu beobachten, welche als Gefäßwirkung der Substanz erklärt wird.
    Notes: Summary The effect of lanatosid C on the peripheral vascular system was studied in a randomized doubleblind cross-over study. 1 mg lanatosid C in saline or a corresponding volume of saline were applied intravenously for 30 min to 6 healthy subjects. A significant drop of 28% in blood flow and an increase of peripheral vascular resistence at rest of 44% during and after the application of the cardiac glycoside could be seen while the placebo effect was minimal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01492864
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Early auditory evoked potentials (EAEP) in vertebral basilar insufficiency (1979)
    Springer
    European archives of psychiatry and clinical neuroscience 227 (1979), S. 367-376 
    Details
    ISSN: 1433-8491
    Keywords: Early auditory evoked potentials ; Vertebral-basilar insufficiency ; Frühe akustisch evozierte Potentiale ; Vertebro-basiläre Insuffizienz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Nach akustischer Reizung mit einem kurzen Tonimpuls (tone pip) lassen sich in den ersten 10 ms das Summenaktionspotential des N. acusticus (I) und weitere 6 Wellen (II–VII) ableiten. 7 Komponenten wurden bei 40 Normalpersonen und 5 Komponenten (I–V) bei 12 Patienten mit typischen Symptomen einer vertebro-basilären Insuffizienz einer genauen Analyse unterzogen. Veränderungen der frühen akustisch evozierten Potentiale (FAEP) lassen eine topische Zuordnung gefäßbedingter Schädigungen dorso-lateraler Hirnstammanteile zu. Es handelt sich um eine nicht-invasive Untersuchungsmethode, die durch Verlaufskontrollen prognostische Aussagen ermöglicht.
    Notes: Summary Stimulation with a short tone pip elicits an acoustic nerve compound action potential (I) and different waves (II–VII) in the initial 10 ms. Seven waves have been studied in 40 control subjects and five waves in 12 patients with vertebral-basilar insufficiency. Abnormalities of the different waves were observed at levels such as cochlea and/or acoustic nerve, medulla, caudal pons, rostral pons, and midbrain. The recording of early auditory evoked potentials (EAEP) is a noninvasive method of confirming impairment of the auditory pathway caused by a reduced vascular supply of vertebral and basilar arteries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344821
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A new approach to explain the “high irradiance responses” of photomorphogenesis on the basis of phytochrome (1975)
    Springer
    Journal of mathematical biology 2 (1975), S. 41-56 
    Details
    ISSN: 1432-1416
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary A new approach to explain the “high irradiance responses” of photomorphogenesis on the basis of phytochrome is described. Irradiance and wave-length dependency of different phytochrome reaction models are analyzed. 1) An open phytochrome model which is based on spectophotometric data (Schäfer, 1972; Schäfer et al., 1972; Schäfer and Mohr, 1974) and describes only the induction phenomena is presented; 2) A closed phytochrome-receptor model which is based on the analysis of phytochrome-receptor interactions (Quail et al., 1973a. Quail and Schäfer, 1974) describes the principal behavior of high irradiance responses, namely, optimum quantum responsivity in the far-red and blue part of the visible spectrum and the irradiance dependency. This model cannot account for the induction phenomena; 3) An open phytochrome-receptor model which describes both the properties of the induction responses, as well as those of the high irradiance responses, is tested for its physiological relevance by comparing the predictions based on this model with the measured data for phytochrome controlled anthocyanin synthesis (Wagner and Mohr, 1966) and suppression of lipoxygenase synthesis in the mustard seedling (Oelze and Mohr, 1973).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276015
    Library Location Call Number Volume/Issue/Year 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...