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
Filter
  • Articles  (191)
  • Articles: DFG German National Licenses  (191)
  • Munksgaard International Publishers  (191)
  • 1
    Electronic Resource
    Electronic Resource
    The influence of stunted body size on the reproductive ecology of bluegill Lepomis macrochirus (2002)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 11 (2002), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract – Although stunting is a common phenomenon in fish populations, the consequences of stunted body size on the reproductive ecology of individuals has received little attention. The present study compares the reproductive ecology of bluegill in established stunted and non-stunted populations. Three ponds (two non-stunted and one stunted) were monitored for spawning activity throughout the summer. Parental male bluegill from both non-stunted populations were older, larger, and had greater mating success (number of eggs or fry within nests) than parental males in the stunted population. Stunted bluegill also experienced a shortened reproductive season owing to the delay in onset of spawning. The present study demonstrates that individual size and population size structure can have a marked influence on the reproductive ecology of bluegill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0633.2002.00011.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Fractional Aerosol Filtration Efficiency of In-Duct Ventilation Air Cleaners (1994)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 4 (1994), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Notes: The filtration efficiency of ventilation air cleaners is highly particle-size dependent over the 0.01 to 3 μm diameter size range. Current standardized test methods, which determine only overall efficiencies for ambient aerosol or other test aerosols, provide data of limited utility. Because particles in this range are respirable and can remain airborne for prolonged time periods, measurement of air cleaner fractional efficiency is required for application to indoor air quality issues. The objectives of this work have been to 1) develop a test apparatus and procedure to quantify the fractional filtration efficiency of air cleaners over the 0.01 to 3 μm diameter size range and 2) quantify the fractional efficiency of several induct air cleaners typical of those used in residential and office ventilation systems.Results show that efficiency is highly dependent on particle size, flow rate, and dust load present on the air cleaner. A minimum in efficiency was often observed in the 0.1 to 0.5 μm diameter size range. The presence of a dust load frequently increased an air cleaner's efficiency; however, some air cleaners showed little change or a decrease in efficiency with dust loading. The common furnace filter had fractional efficiency values of less than 10% over much of the measurement size range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.1994.t01-1-00005.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Associations between classroom CO2 concentrations and student attendance in Washington and Idaho (2004)
    Oxford, UK : Munksgaard International Publishers
    Indoor air 14 (2004), S. 0 
    Details
    ISSN: 1600-0668
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0668.2004.00251.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Stable isotopes and gut content show diet overlap among native and introduced piscivores in a large oligotrophic lake (2005)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 14 (2005), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract –  In past dietary studies kokanee Oncorhynchus nerka were prominent in the diet of Pend Oreille Lake's large piscivores: native bull trout Salvelinus confluentus, cutthroat trout O. clarki and northern pikeminnow Ptychocheilus oregonensis, and introduced lake trout S. namaycush and Kamloops rainbow trout O. mykiss gairdneri. However, kokanee have declined to 10–20% of their former abundance. We therefore initiated this study to understand current predation demands on kokanee and diet overlap among piscivores, using gut content samples and analysis of stable nitrogen (δ15N) and carbon (δ13C) isotopes from the lake's fish and invertebrate community. In gut content samples, kokanee were the main prey item of large [i.e., ≥400 mm total length (TL)] bull and lake trout; a conclusion that was affirmed by stable isotope analysis. Rainbow trout 〉500 mm TL consumed mostly kokanee, thus there was a high degree of diet overlap among large bull, lake and rainbow trout. Small (i.e., 〈400 mm TL) rainbow and cutthroat trout diets overlapped, and were composed mostly of littoral benthic invertebrates. However, gut content and stable isotope analysis did not accord for 400–500 mm TL rainbow trout, small lake trout, and large cutthroat trout. In these instances, a linear mixing model using stable isotope results predicted kokanee consumption for each species, but no kokanee were identified in rainbow or lake trout gut content. Gut content and stable isotope analysis of native northern pikeminnow indicated a diet of mostly littoral benthic invertebrates at smaller (100–150 mm TL) lengths, with kokanee becoming more prominent in the diet of individuals 〉300 mm TL. Percent of kokanee in the diet of northern pikeminnow has declined from a prior study; otherwise piscivore diets have apparently remained unchanged. In this study, judgments as to the feeding of some piscvores, based on gut content alone, would be tenuous because of small sample sizes, but stable isotope analysis provided an efficient means for confirming diets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.2005.00103.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Variation in intrinsic individual growth rate among populations of leatherside chub (Snyderichthys copei Jordan & Gilbert): adaptation to temperature or length of growing season? (2005)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 14 (2005), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract –  Leatherside chub (Snyderichthyes copei Jordan & Gilbert) comprises two lineages (northern and southern) whose centres of geographical range differ by about 3° latitude corresponding to about 30% shorter growing season and about 2 °C lower mean temperature during the growing season. We document patterns of variation in size-at-age among populations of leatherside chub in nature, and we test for variation in intrinsic growth rate of juvenile chub in a common-environment experiment to determine if lineages exhibit different intrinsic growth rates. Northern leatherside chubs at ages 1–3 were about 15% shorter in length compared with southern populations. Variation in hatching date or age at maturity could not account for differences in growth and body size, suggesting that temperature-specific intrinsic growth rates differed among populations. Based on a common environment experiment, we found that reaction norms for temperature-specific growth in length and mass were crossed. At the lower temperature, individuals from the north exhibited higher intrinsic growth in length, and at the higher temperature individuals from the south exhibited higher intrinsic growth in mass. Crossing reaction norms for temperature-specific intrinsic growth rates support a model of local adaptation to thermal regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.2005.00091.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The effects of shading on kaempferol content and leaf characteristics of five soybean lines (1992)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 86 (1992), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Previous work has shown that the presence of kaempferol triglucoside (K9) in soybean (Glycine max L. Merr.) leaves is associated with reduced numbers of stomata, especially on the upper surface. In the present test, shade was imposed on soybean plants as a means of altering the level of K9, and thus testing the relationship between quantities of K9 and stomatal density. Five lines of soybean that differ in their complement of flavonol glycosides were grown in the field unshaded and also with a 64 and 80% reduction in daylight intensity. Samples of the second, sixth and tenth trifoliate leaves were taken at 34, 53 and 77 days after planting. Shade reduced the quantities of flavonoids on a per leaf and a per unit area basis. Shade had no effect on stomatal density in lines containing K9, but reduced stomatal density in lines lacking K9. We envisage two opposing effects of shade on stomatal density: a direct effect in which shade reduces numbers, and an indirect effect in which a decrease in K9 content allows an increase in stomatal density. The net effect of shade on lines containing K9 appears to be the maintenance of a constant stomatal density. The quantity of K9 was highly correlated with stomatal density within all treatment combinations, and with all treatments combined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1992.860213.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Formation of a hexokinase complex is associated with changes in energy utilization in celery organs and cells (2000)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 110 (2000), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We previously presented evidence that the hexose-regulated repression of the mannitol catabolic enzyme mannitol dehydrogenase (MTD) in celery (Apium graveolens L.) may be mediated by hexokinase (EC 2.7.1.1) (HK) [Prata et al. (1997) Plant Physiol 114: 307–314]. To see if differential regulation of HK forms might be involved in the sugar-regulated repression of MTD we characterized two forms of HK with respect to their expression in various plant organs as well as in celery suspension cell cultures. We found that the vast majority of HK activity was membrane-associated, whereas fructokinase (EC 2.7.1.4) was found largely in the soluble cell fraction. Gel filtration chromatography further revealed the differential expression of two molecular size classes of HK. One HK (HK-L) chromatographed at 68 kDa, a typical size for a plant HK, while the second (HK-H) chromatographed at 280 kDa. This unique 280 kDa HK was shown to be composed of a 50 kDa HK protein, possibly complexed with other, as yet unidentified, components. The HK-L was present in all cells and organs analyzed, and thus may be a likely candidate for mediation of sugar repression. In contrast, the presence of the HK-H complex was specific to certain organs and cells grown under certain conditions. Our analyses here showed no correlation between the presence of the HK-H and MTD repression or derepression in celery cells. Instead, the HK-H complex was present exclusively in rapidly growing organs and cells, but not in non-growing celery storage tissues or in carbon-depleted celery suspension-cultured cells. Furthermore, the HK-H complex was present when Glc in the growth media was replaced with 2-deoxy Glc, a HK substrate that does not provide energy for growth and metabolism. These results imply that the HK-H complex may have a potentially unique role in the metabolism of rapidly growing celery cells, in particular, in hexose phosphorylation. We also found that mitochondria prepared from Glc-grown celery suspension-cultured cells contained substantial HK activity, and that oxygen uptake of these mitochondria was stimulated by Glc. These results are consistent with the hypothesis that mitochondrial localization of celery HK may play a role in rapid recycling of adenylate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2000.110104.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Low temperature effects on ubiquinone content, respiration rates and lipid peroxidation levels of etiolated seedlings of two differentially chilling-sensitive species (2004)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Physiologia plantarum 121 (2004), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Ubiquinone functions primarily in the electron transport chain of the mitochondria of plants and animals. Secondary roles in plant tissue, such as antioxidant activity, have also been proposed. The effect of low temperature exposure on etiolated seedling embryonic axes of two differentially chilling-sensitive species, mung bean (Vigna radiata L.) (chilling-sensitive) and pea (Pisum sativum L. cv. Lincoln) (chilling-tolerant) with respect to respiration rate, lipid peroxidation and ubiquinone content was examined. Whole seedlings (embryonic axis and cotyledon) of both species were exposed to control temperatures (20°C) (6 days) or an acclimatory low temperature treatment of 10°C (3 days) followed by exposure at 5°C (3 days). Measurements were initiated 3 days after seedlings had reached 50% germination (D0). Prior to measurements the cotyledons were removed and only the embryonic axis was used in these experiments. Ubiquinol (UQH2), ubiquinone (UQ) and total ubiquinone (UQtot) content decreased in mung bean in response to the temperature treatment and UQH2 and UQtot remained stable in the more chilling-tolerant pea. The reduction of the total Q-pool was approximately 85–92%, suggesting a high degree of saturation of the respiration pathways. Respiration declined and the RQ ratio increased in both species in response to low temperature. Cytochrome c oxidase (COX) (EC 1.9.3.1) activity was higher in pea than in mung bean but decreased during low temperature exposure in both species. Considering that levels of MDA (lipid peroxidation) did not increase in either species in response to chilling, decreased levels of UQH2 and UQ observed in chilling-sensitive mung bean may indicate that these compounds were damaged prior to other membrane lipids during low temperature treatment and rendered undetectable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2004.00352.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Surface morphology, leaf and cuticle thickness of four dwarf shrubs from a sub-Arctic heath following long-term exposure to enhanced levels of UV-B (2003)
    Oxford, UK : Munksgaard International Publishers
    Physiologia plantarum 117 (2003), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In 1991 a field experiment was established in subarctic heathland at Abisko (68°35′N, 18°82′E), northern Sweden, to investigate the effects of enhanced UV-B (280–315 nm) radiation, simulating 15% ozone depletion, on plants in their natural environment. Leaves of the four dominant dwarf shrubs, the deciduous Vaccinium myrtillus L. and V. uliginosum L. and the evergreen V. vitis-idaea L. and Empetrum hermaphroditum Hagerup were examined after 7 years of UV-B treatment. SEM and ESEM were used to visualize surface features and to determine trichome density. Multiphoton laser scanning microscopy showed that UV-B absorbing compounds were localized in the trichomes of all species. Trichomes varied in size, number and distribution between the species. Enhanced UV-B reduced adaxial trichome density significantly (by approximately 25%) in only one species, V. uliginosum. This effect could be of importance for the UV-B absorbing potential of the adaxial epidermis of V. uliginosum. Epicuticular wax structures were found only on the abaxial surface of V. uliginosum and were unaffected by enhanced UV-B. The cuticular surfaces of all other species were smooth and featureless. Leaf thickness, adaxial and abaxial cuticle thickness varied between the species although there was no apparent effect of enhanced UV-B. It is concluded that long-term enhancement of UV-B has an effect on adaxial trichome density in V. uliginosum, but that there is no general effect on leaf morphology of the other species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2003.00006.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Root ammonium transport efficiency as a determinant in forest colonization patterns: an hypothesis (2003)
    Oxford, UK : Munksgaard International Publishers
    Physiologia plantarum 117 (2003), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Ratios of ammonium (NH4+) to nitrate (NO3–) in soils are known to increase during forest succession. Using evidence from several previous studies, we hypothesize that a malfunction in NH4+ transport at the membrane level might limit the persistence of early successional tree species in later seral stages. In those studies, 13N radiotracing was used to determine unidirectional fluxes and pool sizes of NH4+ and NO3– in seedlings of the late-successional species white spruce (Picea glauca) and in the early successional species Douglas-fir (Pseudotsuga menziesii var. glauca) and trembling aspen (Populus tremuloides). At high external NH4+, the two early successional species accumulated excessive NH4+ in the root cytosol, and exhibited high-velocity, low-efficiency (15% to 22%), membrane fluxes of NH4+. In sharp contrast, white spruce had low cytosolic NH4+ accumulation, and lower-velocity but much higher-efficiency (65%), NH4+ fluxes. Because these divergent responses parallel known differences in tolerance and toxicity to NH4+ amongst these species, we propose that they constitute a significant driving force in forest succession, complementing the discrimination against NO3– documented in white spruce (Kronzucker et al. 1997).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2003.00032.x
    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...