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
    An electrochemical method for the measurements of substrate-oxidizing activity of acetic acid bacteria using a carbon-paste electrode modified with immobilized bacteria (1999)
    Springer
    Applied microbiology and biotechnology 51 (1999), S. 664-668 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract In order to measure the substrate-oxidizing activity of intact cells of Acetobacter pasteurianus no. 2, a given amount of the bacterial cells was immobilized on a carbon-paste electrode, and the current at the electrode was measured in a buffer solution. When Fe(CN)3− 6 was added to the buffer solution, an anodic current was observed at 0.5 V (against Ag/AgCl). Further, when ethanol was added to the solution, the current started to increase to reach a steady-state within 3 min. The electrode had a good response to acetaldehyde and lactic acid as well as ethanol. Culture conditions affected the current response to various substances; the response of the electrode modified with the cells grown in static culture was much higher than that of the electrode with the cells grown in shaking culture, and the electrode with ethanol-grown cells had a high response to ethanol and acetaldehyde compared with that of the electrode with glucose-grown cells. The increase in the amount of the current after the addition of ethanol (ΔI EtOH) was linearly proportional to the total number of immobilized cells per electrode in the range 1.0 × 104–1.0 × 108 cells. The ΔI EtOH values were measured with the electrode prepared with a fixed volume of the cell suspensions taken from the culture at 6-h intervals; the dependence of the ΔI EtOH value on time agreed well with the cell growth measured by colony counting and turbidity in the lag and logarithmic phase. After the logarithmic phase, the value of ΔI EtOH sharply decreased, resembling to the growth measured by colony counting, rather than by turbidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051448
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Dietary Restriction Reduces the Prevalence of Osteonecrosis of the Caput Femoris in Spontaneously Hypertensive Rats (1999)
    Springer
    Calcified tissue international 64 (1999), S. 259-262 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Spontaneously hypertensive rat — Osteonecrosis — Caput femoris — Dietary restriction — Mechanical stress — Blood supply.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. We investigated the effects of dietary restriction (DR), an experimental intervention known to suppress several strain-specific diseases, on the prevalence of osteonecrosis of the caput femoris in spontaneously hypertensive rats (SHR). At 6 weeks of age, the food intake of DR rats was restricted to 65% of the mean intake of control rats fed ad libitum (AL). Acute osteonecrosis of the caput femoris without reparative tissue response (RTR) was observed at 10 and 15 weeks in both DR and AL groups; no such acute lesion was seen at 20 and 30 weeks. The prevalence of osteonecrosis, osteonecrosis with/without reparative tissue response was significantly reduced in DR rats at 15 and 20 weeks, but not at 10 weeks. DR reduced the body weight by 30% and the length of the femur by 10%. Ossification of the caput femoris, known to be delayed in AL rats compared with Wistar Kyoto rats, was also restored by DR. Our results showed that dietary restriction reduced the prevalence of osteonecrosis and modulated the mechanical factors involved in the lesion. They also indicate that utilization of dietary restriction is a useful research tool for investigating the underlying mechanisms of osteonecrosis of the caput femoris in SHR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900614
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Elastic-plastic analysis of crack in adhesive joint by combination of boundary element and finite element methods (1998)
    Springer
    Computational mechanics 21 (1998), S. 533-539 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper concerns with a combination method of the boundary element method and the finite element method for elastic-plastic analyses. The combination method proposed here is based on the substructure method using the conjugate gradient method. This combination method has the advantage of saving CPU time and memory storage size over the finite element method. The combination method is applied to a J-integral analysis of a crack in an adhesive joint. The effect of bond thickness on the J-integral is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050331
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Deficiency of cox1 gene expression in wheat plants with Aegilops columnaris cytoplasm (1996)
    Springer
    Current genetics 30 (1996), S. 509-514 
    Details
    ISSN: 1432-0983
    Keywords: Key words Mitochondria ; cox genes ; Transcription ; Alloplasmic wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Wheat plants with Aegilops columnaris cytoplasm are characterized by growth inhibition and partial male sterility and show an impaired mitochondrial cytochrome c oxidase activity. We designed this study to clarify the functional relationship between this impaired cytochrome c oxidase activity and possible structural alterations to the mitochondrial genes cox1, cox2 and cox3 that encode three subunits of the cytochrome c oxidase. Using restriction mapping and DNA sequencing, we found major rearrangements in the flanking regions of the cox1 and cox3 genes. In Northern-blot analysis, we detected two different cox3 transcripts and a reduced level of a cox2 transcript, whereas we could not detect a transcript of cox1. These results suggest that rearrangements of the flanking regions of the cox1 gene may result in the severe suppression of its transcription, and subsequently, may lead to the impaired cytochrome c oxidase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050163
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Early development and estimated life cycle of the mesopelagic copepod Pareuchaeta elongata in the southern Japan Sea (1996)
    Springer
    Marine biology 126 (1996), S. 261-270 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Life cycle of the mesopelagic copepod Pareuchaeta elongata was investigated combining laboratory rearing data on the eggs, nauplii, and early copepodites with field growth data on the late copepodites. Examination and incubation at near the in situ temperature (0.5°C) of egg sacs collected from the field indicated that the clutch size was 13 to 24 eggs (mean: 20), hatching time was 39.4d (mean), and hatchability was low (mean: 28.5%). The development time at 0.5°C was 2.4 d for Nauplius Stage 1 (N1), 4.6 d for N2, 6.2 d for N3. 7.4 d for N4, 7.1 d for N5, 20.8 d for N6, 36.7 d for Copepodite Stage 1 (C1) and 65.3 d for C2. From the numerical analysis of seasonal samples collected from the field, the development time was estimated as 1 mo for C3, 2 mo for C4 and 2.5 mo for C5. Thus, the egg hatching time plus the integrated development time by stage was 355 d or nearly 1 yr (i.e. span of one life cycle). Duration of the C6 (adult) was estimated as〉2.5 mo. Combining the present data on development times of each stage with published data on the major spawning season (August to October) and ontogenetic migration, a schematic representation of the life cycle of this copepod was developed. Between-stage comparison of wet, dry, and ash-free dry weights of all developmental stages of preserved wild specimens revealed that there is almost no gain in weight during naupliar stages, and the greatest weight increment over the life cycle was during the C4 stage. The present results are compared with those for the same and related species living in other regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00347451
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Distribution, growth and life cycle of the mesopelagic amphipod Primno abyssalis (Hyperiidea: Phrosinidae) in the southern Japan sea (1995)
    Springer
    Marine biology 123 (1995), S. 789-798 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The vertical distribution, growth, maturation, brood size and life cycle of the hyperiid amphipod Primno abyssalis (formerly P. macropa) were investigated using seasonal samples collected from Toyama Bay, southern Japan Sea, during the period June 1986 to September 1992. Over four different seasons of the year, P. abyssalis was most abundant in the 200 to 350 m strata at night and the 350 to 400 m strata during the day, indicating 100 to 150 m as the general distance of diel vertical movement. Some differences in vertical migrating behavior were noted among juveniles, adult males and females. Population-structure analysis revealed the occurrence of three cohorts aged 0+, 1+ and 2+ yr. Growth as body length in this species is linear with time. Estimated time to complete one life cycle is 1.8 to 2.5 yr for females, but only 0.8 yr for males. Maximum longevity is 2.8 yr. Instar analysis based on the segment number of pleopod rami indicated that newly hatched juveniles molt ten times to reach adult male, and four more times to reach adult female. Adult instar number was found to be only 1 for males and 5 for females. Ovigerous females occurred throughout the year, but the annual peak of release of juveniles from the female's marsupium is estimated to be arly March. Brood size was not correlated with female size, a maximum brood size of 214 eggs was recorded. The dry and ash-free dry weights of instars suggested that juveniles in the female marsupium, adult males, and older adult females are less active feeding or non-feeding stages. Except for the reduced growth rate and the occurrence of small, short-lived males, most characteristics of P. abyssalis are consistent with the present view of the life modes of mesopelagic animals, including linear growth in length, aseasonal reproduction, and smaller brood size coupled with larger eggs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349122
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Vertical distribution, population structure and life cycle of Neocalanus cristatus (Crustacea: Copepoda) in the Oyashio region, with notes on its regional variations (1999)
    Springer
    Marine biology 134 (1999), S. 683-696 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Vertical distribution and population structure of Neocalanus cristatus were investigated at Site H in the Oyashio region from September 1996 through October 1997 to evaluate their life cycle mode. Additional temporary samplings were also made at several stations covering the entire subarctic Pacific, Okhotsk Sea and Japan Sea, as a basis for regional comparison of life cycles of this species. At Site H, N. cristatus spawned throughout the year below 500 m depth, with a peak from October to December. The resulting eggs and nauplii floated/migrated upward, and formed an abundance peak of Copepodite Stage 1 (C1) in the surface layer in February. In the surface layer, the C1 developed and reached C5 by early June through a phytoplankton bloom which occurred in mid-March to end of June. The C5 migrated to deeper layers in July and August, where they molted to adults. Apparently, the developmental time from C5 to adults was highly variable (〉1 month), and some might overwinter. The life cycle of N. cristatus appeared to be annual for the major portion of the population. Taking into account sampling season, temporal changes in vertical distribution and population structure data collected from regions other than Site H, there was a close correlation in the timing of the life cycle over the entire subarctic Pacific, but the reproduction season (April to June) was observed to be different in the Okhotsk and Japan Sea populations. Regional comparison of prosome length of C5 individuals, including those in the Bering Sea, indicated significantly larger sizes of specimens from the Japan Sea and Okhotsk Sea, as compared with those from the entire subarctic Pacific. Possible causes for regional variability in life cycle patterns and body sizes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050584
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Immunochemical demonstration of Eisenia tetradecapeptide, a bioactive peptide isolated from the gut of the earthworm Eisenia foetida, in tissues of the earthworm (1997)
    Springer
    Cell & tissue research 288 (1997), S. 567-573 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Eisenia tetradecapeptide ; Enzyme-linked immunosorbent assay (ELISA) ; Gut motility ; Immunohistochemistry ; Neuropeptide ; Peptide hormone ; Eisenia foetida (Annelida)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The quantity and localization of Eisenia tetradecapeptide which was isolated from the gut of the earthworm Eisenia foetida were examined in tissues of the same species by enzyme-linked immunosorbent assay and immunohistochemistry. Analysis by enzyme-linked immunosorbent assay showed that Eisenia-tetradecapeptide-like immunoreactivity was present in both the central nervous system (cerebral ganglion, subesophageal ganglion, ventral ganglia, and ventral nerve cord) and the gut (esophagus, crop, gizzard, and intestine). The central nervous system contained a higher amount of Eisenia-tetradecapeptide-like immunoreactivity (1.3 pmol/mg wet weight) than the gut (0.2–0.6 pmol/mg wet weight). Eisenia-tetradecapeptide-like immunoreactivity was scarcely detected in the body-wall muscle, nephridia, and sexual organs (testis, ovary, seminal vesicle, and ovisac). Immunohistochemical analysis demonstrated that intense Eisenia-tetradecapeptide-like immunopositive cells and nerve fibers were present in the central nervous system. Immunoreactivity was found in the epithelial cells lining the esophagus and in the submucous plexus in various parts of the gut. Thus, the present study suggests that Eisenia tetradecapeptide is a neuropeptide and/or peptide hormone present in both the central nervous system and the gut of the earthworm and that its role involves the regulation of gut motility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050842
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Optical and X-ray diffraction study of AgI clusters incorporated into zeolite LTA (1999)
    Springer
    The European physical journal 9 (1999), S. 601-604 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 61.10.Nz Single-crystal and powder diffraction – 36.40.Vz Optical properties of clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. AgI clusters are incorporated into cages of zeolite LTA. The loading density of AgI is systematically changed from 0.2 to 4.0 molecules per α-cage. The electronic states and structures of the AgI clusters, with regard to their optical absorption spectra and X-ray powder diffraction patterns, are discussed. At a dilute loading, a notable absorption band, assigned to the AgI molecule, appears at 5.6 eV. With increasing loading densities, new absorption bands appear at 4.7, 4.2, 4.1, and 3.6 eV. These bands show that (AgI) n (n=2-4) clusters with larger sizes are formed with increasing loading density. These clusters seem to exist in α-cages. The X-ray diffraction (XRD) patterns exhibit superlattice reflections at high loading densities. The appearance of the extra reflections has a correlation with the formation of (AgI)3 and (AgI)4 clusters. The Ag and I atoms of the cluster seem to be situated at the position of tetrahedral-based symmetry in the α-cage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010952
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Development of muon polarization preserved scintillators (1997)
    Springer
    Hyperfine interactions 106 (1997), S. 291-293 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We measured the residual μ+ polarizations in various liquid scintillators to search for an ideal material for an active muon stopper in which the muon spin polarization can be preserved and at the same time their energy loss and tracks can be measured by scintillation lights from the stopper material. We found the residual polarizations of mineral‐oil base liquid scintillators were \sim 4 times larger than that of a plastic scintillator. Further increase of the residual polarization was observed with a mixture of CCl4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012678916503
    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...