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
    Publication Date: 1994-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 1991-01-01
    Print ISSN: 0031-9422
    Electronic ISSN: 1873-3700
    Topics: Biology , Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 1963-07-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 1964-09-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Publication Date: 1982-07-01
    Print ISSN: 0021-9673
    Electronic ISSN: 1873-3778
    Topics: Chemistry and Pharmacology
    Published by Elsevier
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 108 (1976), S. 153-157 
    ISSN: 1432-072X
    Keywords: Bactericidal substances ; Cosmarium impressulum ; Antibiotic test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. eine bereits früher publizierte, besonders empfindliche papierchromatographische Testmethode zum Nachweis von Bakterienhemmstoffen wurde weiter verbessert. 2. In bakterienfreien Kulturen von Cosmarium impressulum wurden durch Extraktion der Algen und der Kulturflüssigkeit mit Äther je 2 verschiedene Bakterienhemmstoffe erhalten. Die Wirkung erstreckte sich auf einige oder alle der geprüften Testkeime (Serratia marcescens und Pseudomonas fluorescens sowie Aerobacter aerogenes oder Bacillus pumilus). 3. Bei Einsaat der Testkeime in die Kulturflüssigkeit von Cosmarium impressulum und anderer Desmidiales ergab sich keine eindeutige bactericide Wirkung der Kulturlösungen. 4. Da die bei Cosmarium nachgewiesenen Bakterienhemmstoffe nur schwach wirksam sind und auch nicht in konstanter Weise gebildet werden, ist zu schließen, daß das normale Fehlen epiphytischer Bakterien auf Cosmarium nicht auf der Bildung wasserlöslicher Hemmstoffe beruht.
    Notes: Abstract 1. An already published test method for detecting bactericidal substances in paper chromatograms was further improved. 2. In cultures of Cosmarium impressulum free from bacteria, two bactericidal substances were found in the ether extracts from the algae and two others in the extracts of the culture medium. The are active against some or all bacteria tested (Serratia marcescens, Pseudomonas fluorescens; Aerobacter aerogenes or Bacillus pumilus). 3. If the culture medium of Cosmarium or another desmidiale was inoculated with the test bacteria, a clear bactericidal effect was never observed. 4. Because the activity of the bactericidal substances of Cosmarium is only small and the formation is not constant, it is concluded that the water-soluble bactericidal substances of the alga are not the cause that epiphytic bacteria do not grow normally on Cosmarium.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Es wird eine neue besonders empfindliche Testmethode zum Nachweis baktericider Stoffe in Papier-Chromatogrammen beschrieben. Die Chromatogrammabschnitte werden mit den Testkeimen beimpft, darauf 1 Tag in einer feuchten Kammer aufbewahrt und dann auf Nähragar ausgelegt. Bei Anwesenheit einer baktericiden Substanz bleibt die Bakterienentwicklung an den betreffenden Chromatogrammabschnitten aus oder verzögert sich (Abb.3 und 5). Benutzt man Serratia marcescens als Testkeim, so zeigt sich die Wirkung auch an der ausbleibenden oder verspäteten Rosafärbung der Chromatogrammabschnitte (Abb.2). 2. Ätherische Extrakte der Knospen von Acer pseudoplatanus sowie der oberirdischen Teile junger Pflanzen von Pisum sativum und Helianthus annuuswurden mit Isopropanol/Wasser/Ammoniak (80:15:5) chromatographiert. Die Papier-Chromatogramme wurden mittels der neuen Methode auf bactericide Stoffe gegenüber Serratia marcescens und Pseudomonas fluorescens, teilweise auch gegenüber Aerobacter aerogenes, getestet. 3. In allen genannten Arten wurden baktericide Stoffe gefunden, vor allem am Start (Acer, Helianthus), und bei Rf 0,6–0,7 (Acer, Pisum). Zusätzlich traten mitunter auch weitere Stoffe auf (Abb. 1, 4, 7und 8). Die baktericiden Stoffe wirkten auf Serratia und Pseudomonas meist im wesentlichen gleich oder doch ähnlich; Aerobacter war in unserem Test weniger empfindlich. 4. Die Chromatogramme enthalten auch wachstumshemmende Stoffe, die durch den Avena-Zylindertest und den Lepidium-Keimungstest nachgewiesen wurden. Diese Hemmstoffe befinden sich vorzugsweise bei Rf 0,6–0,7 in allen drei Arten. Hierbei handelt es sich um den weitverbreiteten sogenannten Inhibitor β; diese Chromatogrammfraktion enthält nach Literaturangaben für Acer (Cornforth u. Mitarb., 1965) sowie Pisum (Dörffling, 1967) als physiologisch entscheidenden Stoff d-Abszisin II (Addicott u. Mitarb., 1964). 5. Der baktericide Stoff von Acer und Pisum mit dem Rf 0,6–0,7 und der wachstumshemmende Stoff mit dem gleichen Rf-Wert sind trotz weiterer Übereinstimmungen (Säurecharakter; eine gewisse Parallelität im Vorkommen beider Stoffe) nicht identisch, denn synthetisches d,l-Abszisin zeigte in physiologischen Konzentrationen keine Baktericidie. — Die Frage nach einer chemischen Verwandtschaft beider Stoffe sowie weiterer baktericider und wachstumshemmender Stoffe miteinander muß zunächst offenbleiben.
    Notes: Summary 1. A new sensitive test method for detecting bactericidal substances in paper chromatograms is described. The chromatogram segments are inoculated with the microbes, kept in a moist chamber for 1 day and then placed on agar medium. Growth of bacteria is stopped or retarded in the presence of bactericidal substances (Figs.3 and 5). If Serratia marcescens is used as test organism, a retardation or missing of pink coloration is observed too (Fig.2). 2. Ether extracts from buds of sycamore (Acer pseudoplatanus), shoots of pea (Pisum sativum) and sun-flower (Helianthus annuus) were chromatographed in isopropanol/water/ammonia 80:15:5 and were tested by the new method with Serratia marcescens, Pseudomonas fluorescens and Aerobacter aerogenes on the presence of bactericidal substances. 3. All species mentioned contain bactericidal substances, especially at the starting zone (sycamore, sun-flower) and at Rf 0.6–0.7 (sycamore, pea). In some cases further substances were observed (Figs. 1, 4, 7 and 8). The substances act nearly in the same manner on Serratia and Pseudomonas. Aerobacter is not very sensitive in this test. 4. Moreover the chromatograms contained substances inhibiting growth of Avena coleoptile segments and germination of Lepidium. Especially the position of these substances is at Rf 0.6–0.7. According to Cornforth et al., 1965 (sycamore) and Dörffling, 1967 (pea) this fraction, known as “inhibitor β”, contains d-abscisin II (Addicott et al., 1964), a growth and germination inhibitor. 5. Synthetical d,l-abscisin II showed no bactericidal activity. Therefore the bactericidal substance Rf 0.6–0.7 in sycamore and pea cannot be identical with the growth and germination inhibitor at the same position, although further details are consistent (acid character, some parallelism in quantitative changes). — The problem of the chemical relationship between these two substances and between other bactericidal and plant growth inhibiting substances remains undecided.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 88 (1993), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Four inbred maize lines differing in chilling tolerance were used to study changes in water status and abscisic acid (ABA) levels before, during and after a chilling period. Seedlings were raised in fertilized soil at 24/22°C (day/night), 70% relative humidity. and a 12-h photoperiod with 200 μmol m−2 s−1 from fluorescent tubes. At an age of 2 weeks the plants were conditioned at 14/12°C for 4 days and then chilled for 5 days at 5/3°C. The other conditions (relative humidity, quantum flux, photoperiod) were unchanged. After the chilling period the plants were transferred to the original conditions for recovery. The third leaves were used to study changes in leaf necrosis, ion efflux, transpiration, water status and ABA accumulation. Pronounced differences in chilling tolerance between the 4 lines as estimated by necrotic leaf areas, ion efflux and whole plant survival were observed. Conditioning significantly increased tolerance against chilling at 5/3°C in all genotypes. The genotypes with low chilling tolerance had lower water and osmotic potentials than the more tolerant genotypes during a chilling period at 5/3°C. These differences were related to higher transpiration rates and lower diffusive resistance values of the more susceptible lines. During chilling stress at 5/3°C ABA levels were quadrupled. Only a small rise was measurable during conditioning at 14/12°C. However, conditioning enhanced the rise of ABA during subsequent chilling. ABA accumulation in the two lines with a higher chilling tolerance was triggered at a higher leaf water potential and reached higher levels than in the less tolerant lines. We conclude that chilling tolerance in maize is related to the ability for fast and pronounced formation of ABA as a protective agent against chilling injury.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Five hundred hydroxyproline-resistant cell lines were selected from cell cultures of wheat (Triticum aestivum L. cv. Koga II) after plating on 10 to 30 mM hydroxyproline (Hyp) containing solid Gamborg B 5 medium. All selected cell lines from 30 mM Hyp-medium contained increased (up to 17-fold) levels of free proline. Seventy-four cell lines were transferred to Hyp-free medium and subcultivated 25 times, for 12 months altogether, after which 80% still had increased proline levels. Fourteen cell lines with increased proline levels were further investigated in liquid media with regard to their frost tolerance, which was measured by means of electrolyte leakage. Ten of them showed increased fros tolerance, with LT 50 values as low as 2.7°C below that of the wild type (-4.7°C). Besides increased proline levels and increased percentage dry weight, the Hyp-resistant cell lines had lower osmotic potentials. Osmotic potentials correlated better than levels of free proline with the increase in frost tolerance.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 48 (1980), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 2-Amino (1-14C) isobutyric acid (AIB) was applied to the leaf tips of thirteen-day-old primary leaves of Zea mays L. cv. Goldprinz. Simultaneously, the leaves were treated in the basal region with solutions of kinetin (KN), abscisic acid (ABA) and mixtures of both hormones. The distribution of the radioactive material was determined after 72 h. Treatment with KN caused an accumulation of radioactive material at the point of application (KN spot). In comparison to controls, the leaf zones between the KN spot and the leaf tip contained lower amounts of radioactive material. Treatment with ABA caused a pattern of distribution opposite to that induced by KN. The ABA point of application (ABA spot) was depleted of radioactive material, whereas the leaf area between the ABA spot and the leaf tip showed enhanched levels of radioactive AIB. The effect of ABA was reduced by application of ABA and KN in equimolar amounts. The results are discussed in relation to the possible role of ABA in hormone-directed transport processes.
    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...