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
    The action of antibiotics on the anaerobic digestion process (1996)
    Springer
    Applied microbiology and biotechnology 46 (1996), S. 587-592 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Antibiotics can disturb the production of biogas during anaerobic digestion. This study shows a systematic approach to understanding how the different bacterial populations involved in the final conversion of organic matter into methane are inhibited by 15 antimicrobial agents with different specificities and modes of action. The results obtained show the following trends: (i) some inhibitors, such as the macrolide erythromycin, lack any inhibitory effect on biogas production; (ii) some antibiotics, with different specificities, have partial inhibitory effects on anaerobic digestion and decrease methane production by interfering with the activity of propionic-acid- and butyric-acid-degrading bacteria,␣(e.g. antibiotics that interfere with cell wall synthesis, RNA polymerase activity and protein synthesis, especially the aminoglycosides); (iii) the protein synthesis inhibitors chlortetracycline (IC50 40 mg l−1) and chloramphenicol (IC50 15–20 mg l−1) are very powerful inhibitors of anaerobic digestion. The majority of the antibiotics tested lacked activity against acetoclastic methanogens, being active only on the acetogenic bacteria. However, chloramphenicol and chlortetracycline could cause the complete inhibition of the acetoclastic methanogenic archaea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050865
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of chlorinated aliphatic hydrocarbons on the acetoclastic methanogenic activity of granular sludge (1997)
    Springer
    Applied microbiology and biotechnology 47 (1997), S. 324-328 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The toxicity of chlorinated aliphatic hydrocarbons on acetoclastic methanogens in anaerobic granular sludge was determined using a standardized anaerobic bioassay method. Most of the chloroaliphatics tested were strong inhibitors of methanogenesis. Tri- and tetrachloride derivatives of methane and ethane were the most highly toxic compounds tested, with concentrations of less than 18 mg/l resulting in 50% inhibition (IC50) of the methanogenic activity. Dichlorinated compounds were less toxic, with IC50 values ranging from 40 mg/l to 100 mg/l. On the other hand, perchlorinated derivatives of ethane and ethene were scarcely inhibitory at concentrations near their maximum water solubility. The toxicity caused by chlorinated aliphatic hydrocarbons was reversible. The comparison of structurally related compounds indicated that unsaturated chloroaliphatics were less toxic than their saturated counterparts. A reverse correlation between the electric dipole moment of these compounds and their methanogenic toxicity is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050935
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Experimentally induced clutch size enlargements affect reproductive success in the Pied Flycatcher (1995)
    Springer
    Oecologia 103 (1995), S. 358-364 
    Details
    ISSN: 1432-1939
    Keywords: Clutch size ; Energy constraints ; Ficedula hypoleuca ; Pied Flycatcher ; Reproductive success
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We performed a food provisioning experiment in a population of Pied Flycatchers Ficedula hypoleuca breeding at high altitude in central Spain to test if food availability before and during laying determines clutch size. Food was provided to one of two pairs with the same date of initiation of nest-building (15 dyads of subsequently reproducing pairs were thus created). Food provisioning began on the day of initiation of nest-building and ended on the day after the last egg was laid. Although laying date was unaffected by the experiment, clutch size in the experimental treatment was significantly larger. This result could indicate that food availability at laying (1) proximately constrained clutch size or (2) that females evaluated future conditions for incubating eggs and feeding nestlings based on food availability at laying. Reproductive success (proportion of eggs that resulted in fledged young) was significantly reduced in the experimental treatment. This effect suggest that supplemented females were tricked by the experiment into laying more eggs than the number of eggs they were able to incubate with success and the number of nestlings they were able to feed, a source of error in clutch size adjustment which could be common in non-experimental situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328625
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Desiccated doubled-haploid embryos obtained from microspore culture of barley cv. Igri (1999)
    Springer
    Plant cell reports 18 (1999), S. 924-928 
    Details
    ISSN: 1432-203X
    Keywords: Key words Barley ; Desiccation ; Embryos ; Doubled haploids ; Microspores
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Barley microspore-derived doubled-haploid embryos have been produced in vitro. The development of embryo desiccation technology will allow long-term storage, germplasm preservation and low delivery cost. Treatment of the microspore-derived embryos was essential to induce desiccation tolerance and to arrest further development and plant regeneration. At the concentrations used, a treatment with trehalose was more efficient than with sucrose, and mannitol was harmful to the embryos. Up to 80% of the desiccated embryos produced complete green plants when transferred to regeneration medium, by the application of a 0.6 m trehalose or a 10–5 m abscisic acid treatment to the embryos in the culture induction medium. The morphology of these plants was similar to plants produced directly from non-desiccated embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050685
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Thermal Evolution of Alumina Prepared by the Sol-Gel Technique (1998)
    Springer
    Journal of materials synthesis and processing 6 (1998), S. 1-7 
    Details
    ISSN: 1573-4870
    Keywords: Alumina ; sol-gel ; structure ; thermal evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The thermal evolution of an alumina gel synthesized by hydrolysis of aluminium alkoxide (sol-gel technique) was studied by thermal analysis (DTA and TGA), X-ray diffraction, FTIR and NMR spectroscopies, and specific surface area measurements. Between 400 and 900°C, γ- and δ-aluminas were formed showing aluminium vacancies preferentially located in tetrahedral sites. The atomic rearrangements produced during α-alumina formation are oriented to the progressive elimination of tetrahedral aluminium in the ultimate phase. The evolution of the specific surface area during heating is explained by changes in structure and microstructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022674107059
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Somatic embryogenesis and plant regeneration from barley cultivars grown in Spain (1998)
    Springer
    Plant cell reports 17 (1998), S. 902-906 
    Details
    ISSN: 1432-203X
    Keywords: Key words Barley ; Somatic embryogenesis ; Plant regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thirty-two barley cultivars grown in Spain, 18 of the two-row type and 14 of the six-row type, were screened for plant regeneration from cultured immature embryos. Although there was much variation in regeneration capacity among the cultivars, plants were obtained from all cultivars except Almunia. No statistical differences were found in the percentage of regeneration between two- and six-row types. The influence of the auxins 2,4-dichlorophenoxyacetic acid, dicamba, and picloram on the induction and maintenance of embryogenesis and regeneration capacity after 3–4 months in culture, were evaluated for cultivars Cobra, Hop and Reinette. Hop had the highest rates of maintenance of embryogenic capacity and plant regeneration. The medium containing dicamba gave the best embryogenic callus induction, maintenance and regeneration. Five regeneration media, differing in growth regulators and micronutrient composition, as well as partial desiccation of the calli before regeneration, were tested. The regeneration medium containing 10 μm copper sulfate gave the best results. Regeneration frequencies after 3–4 months in culture of cultivar Hop were raised from 59.5 to 93.7% in this medium. Silver nitrate and partial desiccation of the calli also enhanced plant regeneration, but the medium containing 10 μm of silver nitrate reduced root formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002990050506
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Phosphorus acquisition and cycling in crop and pasture systems in low fertility tropical soils (1997)
    Springer
    Plant and soil 196 (1997), S. 289-294 
    Details
    ISSN: 1573-5036
    Keywords: litter decomposition ; Oxisols ; phosphorus fractionation ; root distribution ; root length ; savannas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil-plant processes which enhance P acquisition and cycling in low-P Oxisols were investigated in a crop rotations and ley pasture systems experiment on the Colombian eastern plains. Comparison of rooting patterns indicated that, despite low available P at depth, there are important differences in root size and distribution among native savanna, introduced forage and crop species which affect their ability to acquire P from these soils. Differences in crop/forage residue decomposition and P release rates suggest that managing the interaction of residue with soil may help slow P fixation reactions. Despite these differences, soil P fractionation measurements indicate that applied P moves preferentially into labile inorganic P pools, and then only slowly via biomass production and microbes into organic P pools under both pastures and crop rotations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004226708485
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Automatic thermal desorption in GC analysis of dairy product volatiles (1997)
    Springer
    Chromatographia 44 (1997), S. 59-64 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Thermal desorption ; Dairy product volatiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Automatic thermal desorption (ATD) has been evaluated for the analysis of volatile components from dairy products. It has resulted in a fast and reproducible method which needs only a low amount of sample. Volatile components from milk are collected by off-line purging and trapped on cartridges packed which a suitable adsorbent. Cheese samples are submitted to the same process or directly introduced into the cartridges. The desorption step that follows is carried out automatically and on-line with the chromatographic analysis. Repeatability and sensitivity were satisfactory for both types of products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466517
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Rapid identification of volatile compounds in aromatic plants by automatic thermal desorption — GC-MS (1996)
    Springer
    Chromatographia 43 (1996), S. 63-72 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Thermal desorption ; Plant volatiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Thermal desorption is a valuable method for the fractionation of plant volatile components, which can be carried out on-line with GC analysis. The use of coupled GC-MS affords additional qualitative information, of special interest for plant species whose composition has not been previously studied. Some examples of the application of automatic thermal desorption, coupled to GC-MS to the identification and characterization of volatile components of plants of different families are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02272823
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Gas chromatographic-mass spectrometric analysis of volatile compounds in oak wood used for ageing of wines and spirits (1998)
    Springer
    Chromatographia 47 (1998), S. 427-432 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Oak wine barrels ; Volatile compounds from oak
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Characterization of French oak samples used in the ageing of wines and spirits can be achieved by determination of the composition of their volatile fraction. Soxhlet extraction and simultaneous extraction-distillation have been used to obtain different voltatile fractions. analysis of these fractions by gas chromatography-mass spectrometry enables tentative identification of up to ninety six components including phenols, furans, terpenes, acids, esters, and lactones. The results obtained depend on the method and solvent used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02466474
    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...