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
    Comparisons between two apparently distinct forms ofCamponotus nawai ITO (Hymenoptera: Formicidae) (1989)
    Springer
    Insectes sociaux 36 (1989), S. 277-292 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Eine obligatorisch monogyne und eine fakultativ polygyne Form vonCamponotus nawai Ito wurden vergleichen. Jahreszeitliche Veränderungen der Koloniezusammensetzung waren bei beiden Formen ähnlich, abgesehen von der Zeit, in der geflügelte Geschlechtstiere in den Nestern zu finden sind. Die Sammelergebnisse lassen annehmen, daß bei der monogynen Form neue Kolonien nur von einzelnen Königinnen gegründet werden, während sie bei der polygynen Form durch Kolonieteilung entstehen. In polygynen Völkern waren alle oder fast alle Königinnen fertil, sa daß eine funktionelle Polygynie vorliegt. Königinnen der monogynen Form sind größer und haben größere Ovarien. Die Königinnen der polygynen Form zeigen eine bimodale Grossen-verteilung doch sind die kleineren Königinnen seltener. Bei der polygynen Form war die Anzahl der Königinnen mit der Menge der Brutstadien positiv korreliert, aber negativ mit der Menge der Brustadien pro Königin. Anscheinend besiedelt die polygyne Form mehr nördliche Gebiete als die monogyne, ihre Areale überschneiden sich kaum. Aufgrund der jahreszeitlich verschiedenen Schwarmzeiten sind die monogyne und die polygyne Form vonC. nawai möglicherweise zwei verschiedene Arten.
    Notes: Summary Obligately monogynous and facultatively polygynous forms ofCamponotus nawai Ito was compared. The seasonal changes of colony composition were similar in the two forms except for the season in which alates were found in nests. Collection data suggested that new colonies are founded only by single foundresses in the monogynous form, but mainly by colony budding in the polygynous form. All or most queens in polygynous nests were fertile, thus polygyny is functional. The body size and ovarian volume of queens were larger in the monogynous forms. Queens of the polygynous form showed bimodal size distribution, though smaller queens were less frequent. In the polygynous form, the number of queens was positively correlated with the number of immatures, but negatively correlated with the number of immatures per queen. It seems that the polygynous form occupies more northern regions than the monogynous one and their ranges contact parapatrically. The monogynous and polygynous forms ofC. nawai may be different species because of the differing mating seasons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224881
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Behavioral differences of queens in monogynous and polygynous nests of theCamponotus nawai complex (Hymenoptera: Formicidae) (1991)
    Springer
    Insectes sociaux 38 (1991), S. 37-44 
    Details
    ISSN: 1420-9098
    Keywords: Monogyny ; polygyny ; queen behavior ; Camponotus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Behavioral differences of queens of the obligately monogynous and facultatively polygynous forms ofCamponotus nawai complex were examined. Queens of the monogynous form were groomed by and received food from workers more frequently but they walked about inside nests less frequently than queens of the polygynous form. Hierarchical relationships were not observed among queens of polygynous nests. In general, those queens were equally cared for by workers, aggregated around the center of nests, and showed no hostility toward each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242711
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Cooperative foundation of colonies by unrelated foundresses in the antPolyrhachis moesta (1996)
    Springer
    Insectes sociaux 43 (1996), S. 217-226 
    Details
    ISSN: 1420-9098
    Keywords: Pleometrosis ; relatedness of cofoundresses ; Polyrhachis ; DNA fingerprinting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Field studies ofPolyrhachis moesta revealed that colonies were facultatively founded by more than one queen, even though each established colony was inhabited by only one queen with her workers. In pleometrotic colonies, it was found that cofoundresses frequently exhibited cooperative behaviors, including trophallaxis. The results of DNA fingerprinting showed that multiple foundresses were not genetically to one another. It seems that they aggregate randomly and independently of their relatedness. A discussion of the reasons why foundresses ofP. moesta do not aggregate preferentially with genetically related females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242573
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Regulation of Na-K-ATPase Activity in the Proximal Tubule: Role of the Protein Kinase C Pathway and of Eicosanoids (1996)
    Springer
    The journal of membrane biology 152 (1996), S. 235-243 
    Details
    ISSN: 1432-1424
    Keywords: Key words: Na:K pump — Dopamine — Parathyroid hormone — Phospholipase C — Protein kinase C — Cytochrome P450-monooxygenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. To evaluate further the signal transduction mechanisms involved in the short-term modulation of Na-K-ATPase activity in the mammalian kidney, we examined the role of phospholipase C-protein kinase C (PLC-PKC) pathway and of various eicosanoids in this process, using microdissected rat proximal convoluted tubules. Dopamine (DA) and parathyroid hormone (either synthetic PTH1-34 or PTH3-34) inhibited Na-K-ATPase activity in dose-dependent manner; this effect was reproduced by PKC530-558 fragment and blocked by the specific PKC inhibitor calphostin C, as well as by the PLC inhibitors neomycin and U-73122. Pump inhibition by DA, PTH, or arachidonic acid, and by PKC activators phorbol dibutyrate (PDBu) or dioctanoyl glycerol (DiC8) was abolished by ethoxyresorufin, an inhibitor of the cytochrome P450-dependent monooxygenase pathway, but was unaffected by indomethacin or nordihydroguaiaretic acid, inhibitors of the cyclooxygenase and lipoxygenase pathways of the arachidonic acid cascade, respectively. Furthermore, each of the three monooxygenase products tested (20-HETE, 12(R)-HETE, or 11,12-DHT) caused a dose-dependent inhibition of the pump. The effect of DA, PTH, PDBu or DiC8, as well as that of 20-HETE was not altered when sodium entry was blocked with the amiloride analog ethylisopropyl amiloride or increased with nystatin. We conclude that short-term regulation of proximal tubule Na-K-ATPase activity by dopamine and parathyroid hormone occurs via the PLC-PKC signal transduction pathway and is mediated by cytochrome P450-dependent monooxygenase products of arachidonic acid metabolism, which may interact with the pump rather than alter sodium access to it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900101
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Dose-dependent pharmacokinetics of aprindine in healthy volunteers (1984)
    Springer
    European journal of clinical pharmacology 26 (1984), S. 129-131 
    Details
    ISSN: 1432-1041
    Keywords: aprindine ; antiarrhythmic agent ; healthy volunteers ; plasma level ; oral administration ; pharmacokinetics ; urinary excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The disposition of aprindine following a single oral dose can best be described by a two-compartment open model. The mean plasma half-life (t1/2β) increased from 8.0±2.1 h (SD) after a 25 mg dose to 9.4±2.9 h after 50 mg and to 15.8±2.6 h after 100 mg, with a decrease in total plasma clearance (Cl/F) and volume of distribution at steady state (Vdss/F) and during β-phase (Vdβ/F). The area under plasma concentration-time curve (AUC), maximum plasma concentration (Cmax) and the amount of unchanged aprindine excreted in the urine increased in a non-linear fashion with the increase in dose. The t1/2β after multiple oral doses showed a 3-fold increase over the single dose value. These results indicate that aprindine shows dose-dependent non-linear kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00546721
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Preparation of Bi-Sr-Ca-Cu-O thin film by coevaporation and its thermal stability (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 572-574 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin film with a high Tc single phase was prepared on a (100)MgO substrate at a substrate temperature of about 620 °C by coevaporation of Bi2O3, Sr, Ca, and Cu metal. The resistive superconducting transition with onset Tc of 80 K was observed for this film. By post-deposition annealing at 850 °C, the high Tc phase was transformed into a low Tc phase, while films annealed at a higher temperature such as 890 °C maintained the high Tc phase. These results indicated that the high Tc phase can exist only at the high-temperature region (∼890 °C) while the stable phase existing at the low-temperature region (∼850 °C) is the low Tc phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101460
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Low-temperature annealing effect of as-grown Bi-Sr-Ca-Cu-O thin films on superconducting property and the c-axis lattice constant (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1360-1362 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As-grown crystallized Bi2Sr2Ca1Cu2Ox phase films were prepared on MgO(100) substrates by rf magnetron sputtering. The as-grown film showed the Tc onset of 92 K and the Tc end of 82 K. By annealing in the furnace at 480 °C after deposition, superconducting property and the c-axis lattice constant varied with atmosphere during annealing. The film after annealing in air at 480 °C exhibited the highest superconducting transition with the Tc onset of 93 K and the Tc end of 85 K. The Tc onset increased when the c-axis lattice constant was increased, suggesting that the Tc onset increases with decreasing the oxygen content of the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101897
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    As-grown crystallized thin film of Bi-Sr-Ca-Cu-O and its low-temperature annealing effect (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1474-1476 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The as-grown crystallized films of low Tc phase (Tc∼80 K) in a Bi-Sr-Ca-Cu-O system were prepared by rf magnetron sputtering and were annealed in argon or oxygen atmosphere below 500 °C. Superconducting properties and the c-axis lattice constant varied according to the annealing temperature and atmosphere. These results suggest that the oxygen content in the film is varied by low-temperature annealing and that the variation of oxygen content affects the superconducting and structural properties. By cooling the sample in the chamber in 760 Torr oxygen, the as-grown film with Tc end at 74 K was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101408
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Epitaxial Y-Ba-Cu-O films on Si with intermediate layer by rf magnetron sputtering (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1967-1969 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial films of Y-Ba-Cu-O were obtained on a Si substrate, using an epitaxial intermediate layer consisting of BaTiO3(or SrTiO3)/MgAl2O4. MgAl2O4 was epitaxially grown on the Si(100) substrate by chemical vapor deposition. Then, SrTiO3 or BaTiO3 was also epitaxially grown on the MgAl2O4 layer by means of rf magnetron sputtering. Epitaxial Y-Ba-Cu-O films were prepared on BaTiO3(SrTiO3)/MgAl2O4/Si substrates by rf magnetron sputtering. Preparation of an Y-Ba-Cu-O film directly on MgAl2O4/Si was also studied, but only a randomly oriented polycrystalline film has been obtained so far. Resistive superconducting transitions with zero resistance at 65 K on SrTiO3/MgAl2O4/Si and at 70 K on BaTiO3/MgAl2O4/Si were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100488
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Heat capacity of ternary compounds RNiGe(R=Gd, Dy, Er, and Y) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 7410-7412 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The heat capacity of the ternary compounds RNiGe(R=Er, Dy, Gd, and Y) was studied in the temperature range between 2 and 40 K. From the heat capacity curves, Néel temperatures are found to be 3.3, 7.4, and 10.7 K for ErNiGe, DyNiGe, and GdNiGe, respectively. The heat capacity of YNiGe was well fitted with an average Debye temperature of 272 K in the temperature range between 2 and 40 K. The changes of magnetic entropy indicate a strong influence of the crystal field on the Er+3 and Dy+3 ion in ErNiGe and DyNiGe compounds. These results suggest the possibility of using these compounds as magnetic regenerator materials near the temperature of 4.2 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360395
    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...