Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-072X
    Keywords: Nitrosomonas spec ; Ammonia oxidizing bacterium ; Polyhedral inclusion bodies ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Polyhedral inclusion bodies were observed in cells of a Nitrosomonas species. They were present in growing cells as well as in resting cells. In thin sections their size was about 130 nm in growing cells and about 185 nm in diameter in resting cells. The bodies were commonly located in the nucleoplasm. They appeared to be bounded by a nonunit membrane and had a granular substructure. In thin sections about 70% of the exponentially grown cells and about 20% of the resting cells of the investigated strain showed 1–7 respectively 1–3 inclusion bodies.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-072X
    Keywords: Ammonia-oxidizing bacteria ; Nitrosococcus ; Nitrosomonas ; Nitrosospira ; Nitrosoyibrio ; Mixotrophic growth ; Energy efficiency ; Cell yield ; Heterotrophic growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of various organic compounds on the growth of ammonia-oxidizing bacteria was examined.Nitrosococcus oceanus, a strongly halophilic bacterium, had a very low tolerance to organic matter compared with other organisms tested. Organic compounds scarcely affected the growth of theNitrosomonas strains whereas nitrite formation by bothNitrosococcus mobilis strains was inhibited by nearly all of the substances tested. The growth ofNitrosospira strain Nsp1 was enhanced more than 30% by acetate and formate, but not growth was detectable in the presence of pyruvate. On the contrary,Nitrosospira strain Nsp5 was stimulated only by pyruvate. Nitrite formation by the twoNitrosovibrio tenuis strains tested was similar. The growth of both strains was enhanced considerably by formate and glucose; acetate and, to a greater extent, pyruvate inhibited these bacteria. In batch culture, the energy efficiency of autotrophically grown ammonia-oxidizing bacteria varied from strain to strain. The cell yield of mixotrophically grown cultures, per unit of ammonia oxidized, was increased in comparison with autotrophic ones. No heterotrophic growth was detected.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-072X
    Keywords: Ammonia-oxidizing bacteria ; Guanine + cytosine content of DNA ; Genome sizes ; DNA-DNA homologies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract DNA of 96 strains of the genera Nitrosomonas, Nitrosococcus, Nitrosospira, Nitrosolobus, and Nitrosovibrio was isolated and analysed spectrophotometrically. Percentages of guanine plus cytosine (G+C) content, genome sizes, and DNA-DNA homologies were determined. The results indicated the presence of eight Nitrosomonas species, three or four Nitrosococcus species, five Nitrosospira species, and two species of both Nitrosolobus and Nitrosovibrio. DNA homologies between strains of a separate species ranged from 56–100%. Average homologies between strains of different species were 33% in Nitrosococcus, 36% in Nitrosomonas, 37% in Nitrosolobus, 40% in Nitrosospira, and 42% in Nitrosovibrio. Average homologies between species of different genera were 33% and thus not significantly above the background value of 30% detected between DNA of ammonia-oxidizing bacteria and Escherichia coli. Genome sizes ranged from 1.90–2.74×109 dalton in Nitrosomonas, 2.09–2.37×109 dalton in Nitrosococcus, 1.87–2.15×109 dalton in Nitrosospira, 1.92–2.10×109 dalton in Nitrosolobus, and 1.91–2.15×109 dalton in Nitrosovibrio. Differences in genome sizes were in accordance with DNA homologies.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 69 (1969), S. 180-196 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Die von Näveke (1965) vorgeschlagene manometrische Methode zur Bestimmung des aus CO2 stammenden Anteils an der Gesamtkohlenstoffassimilation (=Kohlenstoffquotient) durch heterotrophe Bakterien wurde auf ihre Brauchbarkeit geprüft. 2. Am Beispiel des oxydativen Abbaues von Formiat durch Micrococcus denitrificans konnte gezeigt werden, daß die Methode zu beträchtlichen Fehlern führen kann, wenn bestimmte Bedingungen nicht eingehalten werden. 3. Durch Stabilisierung des pH-Wertes in der Zellsuspension und durch möglichst schnelle Herstellung des gewünschten CO2-Partialdrucks im Gasraum der Warburggefäße konnten die Fehlerquellen weitgehend beseitigt werden. 4. Unter den veränderten Versuchsbedingungen erreichte der Kohlenstoffquotient von M. denitrificans nach der Oxydation von Ameisensäure den Wert 1,0. 5. Hieraus konnte der Schluß gezogen werden, daß M. denitrificans seinen gesamten C-Bedarf vermutlich aus CO2 deckt, wenn die Energie dazu aus der Dehydrierung von Ameisensäure fließt. 6. Aus der O2-Einsparung bei der Oxydation von 20 μmolen Formiat in Gegenwart von CO2 ließ sich berechnen, daß dabei 13,9 μg C assimiliert werden. Die direkte Bestimmung des assimilierten C durch nasse Verbrennung der Bakterien führte zu ungefähr dem gleichen Betrag. 7. Daraus ließ sich ein Nutzeffekt der Formiatoxydation von etwa 10% berechnen.
    Notes: Summary 0950 08 1. The manometric method as described by Näveke (1965) used to determine the amount of entirely assimilated carbon derived from CO2 (=carbon-quotient) by heterotrophic bacteria was investigated for its usefulness. 2. With the example of oxidative decomposition of formate by Micrococcus denitrificans it has been demonstrated that the method can lead to considerable errors if certain conditions are not observed. 3. The sources of error could be eliminated extensively by stabilization of the pH-value in the cell suspension and by obtaining as soon as possible the wanted CO2-partial pressure in the gas room of the Warburg-vessels. 4. Under the modified conditions the carbon-quotient of M. denitrificans reached the value 1.0 after oxidation of formic acid. 5. From this it could be concluded that the entire carbon requirement of M. denitrificans is probably satisfied from CO2 if the energy is obtained from the dehydrogenation of formic acid. 6. From the O2-saving after the oxidation of 20 μmoles formate in the presence of CO2 it could be calculated that 13,9 μg C are thereby assimilated. The direct determination of assimilated carbon by wet combustion of the bacteria gave approximately the same result. 7. From this a free-energy efficiency of the formate-oxidation of about 10% could be calculated.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1432-072X
    Keywords: Nitrosococcus mobilis ; Ammonia oxidizing bacterium ; Morphology ; Ultrastructure ; Physiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An ammonia-oxidizing bacterium was isolated from a sample of brackish water (North Sea, Harbour of Husum). It is a motile large coccus 1.5–1.7 μm in diameter. The extensive cytomembrane system occurring as flattened vesicles in the peripheral region of the cytoplasm and as intrusions into the center of the cytoplasm is to be emphasized as a characteristic mark of identification. The lithoauto-trophically growing bacterium turned out to be an obligate halophile. Because of its physiological and morphological properties, we assigned it to the genus Nitrosoccus and propose the name Nitrosococcus mobilis.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1432-072X
    Keywords: Ammonia oxidizing bacterium ; Nitrosovibrio tenuis ; Isolation ; Morphology ; Ultrastructure ; Physiology ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An ammonia-oxidizing, autotroph growing, slender, curved rod was isolated from the soil of Hawaii. It is well distinguishable from any other nitrifying bacteria thus far described by their morphology. The cells are 1.1–3.0 μm long and 0.3–0.4 μm wide. They are motile by means of 1–4 subpolar to lateral flagella. In contrast to most of the ammonia-oxidizing bacteria the isolated vibrio is void of an extensive cytomembrane system. To categorize this not yet described species we propose to create the new genus Nitrosovibrio and to classify the isolated strain as Nitrosovibrio tenuis.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1432-072X
    Keywords: Nitrosomonas spec ; Ammonia Oxidizing Bacterium ; Polyhedral Inclusion Bodies ; Carboxysomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Polydedral inclusion bodies were isolated from exponentially grown cells of Nitrosomonas spec. The bodies contained d-ribulose, 1,5-bisphosphate carboxylase. The specific activity of the enzyme was 0.0122 μmol CO2 fixed per min per mg of protein.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung 1. Die Oxydation von Glycerin mit O2 oder mit Nitrat durch ruhende Zellen von Micrococcus denitrificans wird durch Licht stark gehemmt. 2. Unter der Einwirkung des Lichtes findet — unabhängig von der Art des Stoffwechsels der Zellen — eine rasche Ausbleichung ihrer Cytochrome statt (Cyt. c, b und a). 3. Damit parallel läuft die Abtötung der Zellen. 4. Es wird vermutet, daß die Ausbleichung der Cytochrome die Ursache für die Herabsetzung der Atmungsaktivität der Zellen im Licht ist.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Planta 25 (1936), S. 155-193 
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...