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  • 1995-1999  (1,302)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Global Change and Mediterranean-Type Ecosystems (1995)
    New York [u.a.] : Springer-Verl.
    Associated volumes
    Details Availability
    Call number: PIK N 630-95-0393
    In: Ecological studies
    Type of Medium: Monograph available for loan
    Pages: 527 p.
    ISBN: 0387943528 , 3-540-94352-8
    Series Statement: Ecological studies 117
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Large forest fires (1998)
    Leiden : Backhuys Pub.
    Details Availability
    Call number: PIK N 531-98-0185
    Type of Medium: Monograph available for loan
    Pages: 239 p.
    ISBN: 9073348803
    Location: A 18 - must be ordered
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  • 3
    Electronic Resource
    Electronic Resource
    DETERMINATION OF LEAD IN AEROSOL SAMPLES COLLECTED ON GLASS FIBER FILTERS BY AN IMPROVED ATOMIC ABSORPTION SPECTROMETRY METHOD (1997)
    Springer
    Water, air & soil pollution 96 (1997), S. 145-153 
    Details
    ISSN: 1573-2932
    Keywords: atmospheric aerosol ; acid digestion procedure ; atomic absorption spectrometry ; heavy metal ; lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper presents a simple, reliable, economical, safe, accurate and reproducible method for atmospheric aerosol lead determination in glass fiber filters, consisting on an acid digestion procedure and atomic absorption spectrometry quantification. The acid digestion is accelerated by the use of a microwave oven with capped Teflon PFA vessels, and a two steps power and time program. The mixture of 10 mL HNO3 and 1 mL HF was selected between many tries, for both economic and environmental reasons. The use of direct standards for quantification is proposed instead of added standards on filters, using background correction (deuterium lamp). The filter lead content quantification was carried out through blank analyses. Lead determinations were carried out then in 2629 samples of atmospheric aerosol at three sampling points in the city of Cartagena (Spain), from 1990 to 1994. We present the annual average of these values for each year and sampling location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026442109576
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of lead in aerosol samples collected on glass fiber filters by an improved atomic absorption spectrometry method (1997)
    Springer
    Water, air & soil pollution 96 (1997), S. 145-153 
    Details
    ISSN: 1573-2932
    Keywords: atmospheric aerosol ; acid digestion procedure ; atomic absorption spectrometry ; heavy metal ; lead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper presents a simple, reliable, economical, safe, accurate and reproducible method for atmospheric aerosol lead determination in glass fiber filters, consisting on an acid digestion procedure and atomic absorption spectrometry quantification. The acid digestion is accelerated by the use of a microwave oven with capped Teflon PFA vessels, and a two steps power and time program. The mixture of 10 mL HNO3 and 1 mL HF was selected between many tries, for both economic and environmental reasons. The use of direct standards for quantification is proposed instead of added standards on filters, using background correction (deuterium lamp). The filter lead content quantification was carried out through blank analyses. Lead determinations were carried out then in 2629 samples of atmospheric aerosol at three sampling points in the city of Cartagena (Spain), from 1990 to 1994. We present the annual average of these values for each year and sampling location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407201
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  • 5
    Electronic Resource
    Electronic Resource
    Multiple effects of salinity on photosynthesis of the protist Euglena gracilis (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 101 (1997), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effect of NaCl in the culture medium on growth, photosynthesis and cell content of chlorophyll, K+, Na+, Ca2+ and Mg2+ in Euglena gracilis was studied. O2 production, quantum yield of photosystem II (PSII), the non-photochemical quenching of chlorophyll fluorescence (qN) and the chlorophyll alb ratio all diminished by 0.2 M NaCl. Respiration and chlorophyll a and b increased, whereas the photochemical quenching (qp) of chlorophyll fluorescence was not affected by 0.2 M NaCl. Salt stress also induced an increase in cell volume and in K+ and Na+ concentrations, but decreased the concentrations of Ca2+ and Mg2+. Except for a protective effect on O2 production, additional Ca2+ in the culture medium did not attenuate the salt effect on the parameters measured. The addition of HCO3− restored the PSII quantum yield of O2 production in cells grown in high salt. Salt stress promoted a decrease in the apparent rate of quinone A (QA) reduction and an apparent obstruction of QB reduction, which were not prevented by excess HCO3−; the addition of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) did not increase chlorophyll fluorescence in salt-grown cells. These results indicate that photosynthesis in Euglena grown under salt stress exhibits: (1) diminution of the HCO3− dependent water-splitting activity of PSII; (2) inhibition of the electron transfer at the quinone pool level; (3) probable increase in thylakoid stacking (as indicated by the effect on the chlorophyll alb ratio); and (4) dissipation of the H+ gradient across the thylakoid membranes (as indicated by the decrease of qN).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1997.tb01063.x
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of nest size on stone-gathering behaviour in the chinstrap penguin (1999)
    Springer
    Polar biology 22 (1999), S. 90-92 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Stone-collecting behaviour was studied in a colony of chinstrap penguins (Pygoscelis antarctica), to explore the likely importance of nest size. We randomly categorised nests as control or experimental. All nests were weighed at the beginning of the incubation period. In the experimental nests we removed stones constituting 50% of their initial weight, while in the control nests all the stones were returned after weighing. All nests were weighed again either prior to or just after hatching to determine likely changes in their weight. The mean weight increase of experimental nests was significantly higher than the mean weight increase of control nests. Size represents a property of the nest which individuals continuously monitor throughout the incubation/brooding period, reacting to changes in it by appropriate changes in stone-collecting rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050394
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  • 7
    Electronic Resource
    Electronic Resource
    Plant biomass and fruit yield induction by Ti(IV) in P-stressed pepper crops (1995)
    Springer
    Nutrient cycling in agroecosystems 43 (1995), S. 131-136 
    Details
    ISSN: 1573-0867
    Keywords: phosphorus ; titanium ; fertilizer efficiency ; plant nutrition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract To study the titanium effect on P nutrition, a greenhouse experiment withCapsicum annuum L., cv. Bunejo plants growing under differential P fertilization was conducted. All the plants were grown under identical conditions and they only differred in the P fertilization and in Ti supply. Plant biomass production of the Ti-untreated plants was affected by the diminution of the P-feed, but the plants growing under the lowest P supply did not showed any deficiency symptom during the crop cycle. All the Ti-treated plots showed a significative increase of the plant biomass against their corresponding untreated references. The biomass enhancement was mainly caused by the increase of the fruit yield with an absolute enhancement of 62% in the plants growing under the lowest P feed, and of 45% in the plants with a complete P support.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00747692
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  • 8
    Electronic Resource
    Electronic Resource
    Breeding time, health and immune response in the chinstrap penguin Pygoscelis antarctica (1998)
    Springer
    Oecologia 115 (1998), S. 312-319 
    Details
    ISSN: 1432-1939
    Keywords: Key words Antarctica ; Breeding failure ; Serological variables ; T-cell-mediated immunity ; Timing of breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Health status and immunocompetence have been proposed as important factors affecting individual variation in the attainment of breeding condition in birds. We studied individual variation in serological variables indicating health status (blood sedimentation rate, haematocrit, `buffy coat' layer, proportions of different types of leucocytes) in two groups of breeding chinstrap penguins Pygoscelis antarctica with breeding dates 9 days apart. We sampled these individuals shortly after hatching of their young and at the end of the chick-raising period. A group of failed breeders was also sampled. Birds of both sexes were included. We also measured the T-cell-mediated immune response as indicated by an in vivo hypersensitivity response to an intradermal injection of a mitogen (phytohaemagglutinin) in early and late breeders. Sex had no significant effect on most variables. Late breeders had poorer health (more leucocytes, especially heterophils and lymphocytes) and a lower T-cell-mediated immune response than early breeders. Failed breeders were more similar to late than to early breeders. Early breeders suffered a decline in health status throughout the chick-raising period. The impact of pathogens on variation in life history traits in avian populations may be important even in extreme Antarctic environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050522
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  • 9
    Electronic Resource
    Electronic Resource
    Heavy metals in Antarctic organisms (1997)
    Springer
    Polar biology 17 (1997), S. 131-140 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  To evaluate levels of essential (zinc and copper) and non-essential (mercury and cadmium) heavy metals, 34 species of organisms from different areas close to the Antarctic Peninsula were analysed. These included algae, filter-feeders, omnivorous invertebrates and vertebrates. Mercury was not detected, while cadmium was found in the majority of organisms analysed (detection limit was 0.05 ppm for both metals). The highest cadmium concentration was observed in the starfish Odontaster validus. Anthozoans, sipunculids and nudibranchs showed maximum levels of zinc, while the highest copper level was found in the gastropod Trophon brevispira. Mercury and cadmium levels in fishes were below the detection limit. Concentrations of essential and non-essential metals in birds were highest in liver followed by muscle and eggs. Cadmium and mercury levels in muscle of southern elephant seals were above the detection limit, whereas in Antarctic fur seals they were below it. The objective of the study was to gather baseline information for metals in Antarctic Ocean biota that may be needed to detect, measure and monitor future environmental changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050115
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  • 10
    Electronic Resource
    Electronic Resource
    Morphological changes related to the climateric period of the adult Cuban women (1999)
    Springer
    International journal of anthropology 14 (1999), S. 219-226 
    Details
    ISSN: 1824-3096
    Keywords: Menopause ; Havana ; Anthropometrics ; Body composition ; Discriminant Analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of the present study is to analyze the morphologic changes occurring along the period of a woman's life thatareknown as climacterium. Our sample consists of 648 women from different provinces of Cuba, but who lived in Havana for at least 15 years. Morphological variables such as height, weight, biliocristal and biachromial diameters and six subcutaneous fat skinfolds were measured. With regard to the menopausic condition, the sample was divided into three subpopulations: premenopausic, naturally menopausic and surgically menopausic (when the two ovaries had been removed). Age at menopause was calculated by both the “retrospective” (49.45±0.49) and “status quo” (48.83±0.02) methods. The results obtained point towards morphological differences between pre- and postmenopausic women. We observed greater accumulations of fatty tissue in the suprailiac regions of postmenopausal females. Lean body mass represents a bigger fraction of the total body weight in women who are still menstruating. In the case of surgically menopausic women, they are at a mid-distance between the premenopausic and naturally menopausic subpopulations. A discriminant analysis was carried out which confirmed the results previously observed. From this analysis it appeared the body mass index and the subcutaneous skinfolds are the variables that discriminante, that is, separate, the three subsamples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447631
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