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  • Articles  (77)
  • Springer  (41)
  • American Institute of Physics  (18)
  • National Academy of Sciences  (11)
  • Blackwell Publishing Ltd  (7)
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  • Articles  (77)
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  • 1
    Electronic Resource
    Electronic Resource
    Physiological Relevance of Pyroglutamate Aminopeptidase II (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 553 (1989), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1989.tb54543.x
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  • 2
    Electronic Resource
    Electronic Resource
    The improved incorporation of polyunsaturated fatty acids and changes in liver structure in larval gilthead seabream fed on microdiets (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Two feeding experiments were conducted to evaluate the suitability of two commercial microdiets as a complementary food for the rearing of larval gilthead seabream Sparus aurata. The effect of these diets on growth, survival and total lipid composition, as well as the histological structure of the liver were examined. The results of the first trial highlighted water quality as an important factor for the survival of microdiet-fed larvae. An increase in water flow rate improved larval survival despite a reduction in live food supply. An effect of tank design on larval growth and survival was observed also and seems to be related with the light level inside the tanks; wider light grey tanks gave better results than narrower black ones. Microdiet feeding significantly improved larval growth and increased hepatocyte diameter and presence of PAS positive vacuoles suggesting an increased glycogen storage in comparison with that of larvae fed live prey only. Artificial diets provided the larvae with a higher amount of lipids and polyunsaturated fatty acids of the n-3 series, resulting in a higher DHA content in the total lipid of the larvae fed on microdiets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01526.x
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  • 3
    Electronic Resource
    Electronic Resource
    Some observations on Babesiosoma bettencourti (França, 1908) n. comb. (syns. Haemogregarina bettencourti França, 1908; Desseria bettencourti Siddall, 1995) from eels, Anguilla anguilla L., in Portugal (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 21 (1998), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The stages of a babesiosome were recorded from the erythrocytes of 73 out of 591 European eels, Anguilla anguilla L., captured in six rivers in northern and central Portugal during the period from January 1988 to July 1994. The prevalence, intensity and seasonality of the infection were recorded. Parasites were mostly intraerythrocytic in stained blood films. Unidivided and cruciform meronts, merozoites and gamonts were identified, and the meront stage was the most common. Mixed infections, in which the babesiosome coexisted with Trypanosoma granulosum Laveran & Mesnil, 1902, were present in 72 out of the 591 eels. In captive fish kept for up to 6 months, fluctuations in the levels of infection with the babesiosome were noted. The babesiosome existed in a similar geographical location, in what was presumed to be the same host and in the same host cell type as a parasite described earlier as Haemogregarina bettencourti. Furthermore, the gamonts of the babesiosome and the haemogregarine overlapped in morphometric description. Although H. bettencourti was recently assigned to the genus Desseria, a nomenclatural correction is proposed: a new combination, Babesiosoma bettencourti (França, 1908) (syns. Haemogregarina bettencourti França, 1908; Desseria bettencourti Siddall, 1995) in the European eel, Anguilla anguilla L. The definitive host of B. bettencourti is unknown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1998.00131.x
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  • 4
    Electronic Resource
    Electronic Resource
    Uptake regions of inorganic nitrogen in roots of carob seedlings (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 95 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Three-week-old seedlings of carob (Ceratonia siliqua L. cv. Mulata) were grown for 9 weeks under different root temperatures (20, 30 and 40°C) at pH values of 5, 7 and 9 with nitrate or ammonium as nitrogen source. Nitrogen uptake rates were determined by depletion from the medium and decreased with distance from the apex. The decline of nitrogen uptake rates along the roots depended on the form of inorganic nitrogen in the medium as well as on pH and temperature, such that the NO−3 and NH+4 ions were taken up essentially by the root tips (0–2 cm) through processes requiring energy. The uncharged NH3 species entered passively, through the mature parts of the root (2–10 cm). Root zone temperature and pH affect the NH+4/NH3 equilibrium in the nutrient solution and, consequently, the uptake areas of the root for these ions. Furthermore. while root tip uptake of nitrogen is energy dependent, uptake through mature root areas is essentially passive and seems to depend on a well developed apparent free space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1995.tb00824.x
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  • 5
    Electronic Resource
    Electronic Resource
    Nitrogen assimilation and transport in carob plants (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Most of the nitrate reductase activity (80%;) in carob (Ceratonia siliqua L. cv. Mulata) is localised in the roots. The nitrate concentration in the leaves is relatively low compared to that in the roots, suggesting that nitrate influx into the leaf may be a major factor limiting the levels of nitrate reductase in the shoot. Transport of nitrate from root to shoot appears limited by the entrance of nitrate into the xylem. In order to study this problem, we determined the nitrate concentrations and nitrate reductase activities along the roots of nitrate-grown plants, as well as the composition of the xylem sap and the nitrate levels in the leaves. Some of the the bypocotyl, in order to bypass the loading of nitrate into the xylem of the roots. The results show that the loading of nitrate into the xylem is a limiting step.The cation and anion concentrations of nitrate- and ammonium-fed plants were similar, showing almost no production of organic anions. In both nitrate- and ammonium-fed plants, the transport of nitrogen from root to shoot was in the form of organic nitrogen compounds. The nitrate reductase activity in the roots was more than sufficient to explain all the efflux of OH− into the root medium of nitrate-fed plants. In carob plants the K-shuttle may thus be operative to a limited extent only, corresponding to between 11 and 27%; of the nitrate taken up. Potassium seems to be the cation accompanying stored nitrate in the roots of carob seedlings, since they accumulate nearly stoichiometric amounts of K+ and NO−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05209.x
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  • 6
    Electronic Resource
    Electronic Resource
    Uptake of ammonium and nitrate by carob (Ceratonia siliqua) as affected by root temperature and inhibitors (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seedlings of carob (Ceratonia siliqua L. cv. Mulata) were grown in nutrient solution culture for 5 weeks, with or without nitrogen at different root temperatures (10, 16, 22, 30, 35 or 40deg;C) and with the air temperature kept between 20 and 24°C. The nitrogen was given as either ammonium or nitrate. At all root temperatures studied, nitrogen-depleted plants developed higher net uptake rates for nitrogen than plants grown in the presence of nitrogen. Temperature affected the kinetic parameters of nitrate uptake more than those of ammonium uptake. With increasing root temperature, the Km of ammonium uptake decreased, but to a lesser extent than the Km for nitrate. The increase in Vmax of ammonium uptake with temperature was also less noticeable than that for nitrate uptake. Ammonium and nitrate uptakes were inhibited in a similar way by respiratory or protein synthesis inhibitors. It may be noted that ammonium uptake in the presence of inhibitors at 40°C was higher than uptake at 10°C without inhibitors. Some similarities between the transport mechanisms for nitrate and ammonium are underlined in the present work. Components of both transport systems displayed saturation kinetics and depended on protein synthesis and energy. The following components of nitrate uptake were distinguished: (a) a passive net influx into the apparent free space; (b) a constitutive active uptake and (c) active uptake dependent on protein synthesis. We may similarly define three ammonium uptake systems: (a) a passive influx into the apparent free space; (b) passive diffusion uptake at high temperature and (c) active uptake dependent on protein synthesis. The possible role of the ratio between mechanism (c) and mechanism (b) as determinant of ammonium sensitivity is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05210.x
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of nitrogen source on photosynthesis of carob at high CO2 concentrations (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 89 (1993), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Carob seedlings (Ceratonia siliqua L. cv. Mulata), fed with nitrate or ammonium, were grown in growth chambers containing two levels of CO2 (360 or 800 μl l−1), three root temperatures (15, 20 or 25°C), and the same shoot temperature (20/24°C, night/day temperature). The response of the plants to CO2 enrichment was affected by environmental factors such as the type of inorganic nitrogen in the medium and root temperature. Increasing root temperature enhanced photosynthesis rate more in the presence of nitrate than in the presence of ammonium. Differences in photosynthetic products were also observed between nitrate- and ammonium-fed carob seedlings. Nitrate-grown plants showed an enhanced content of sucrose, while ammonium led to enhanced storage of starch. Increase in root temperature caused an increase in dry mass of the plants of similar proportions in both nitrogen sources. The enhancement of the rates of photosynthesis by CO2 enrichment was proportionally much larger than the resulting increases in dry mass production when nitrate was the nitrogen source. Ammonium was the preferred nitrogen source for carob at both ambient and high CO2 concentrations. The level of photosynthesis of a plant is limited not only by atmospheric CO2 concentration but also by the nutritional and environmental conditions of the root.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1993.tb05212.x
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  • 8
    Electronic Resource
    Electronic Resource
    Picosecond duration laser pulse generation by simultaneous active-passive mode-locking in Ar+ ion and dye lasers (1983)
    Springer
    Optical and quantum electronics 15 (1983), S. 487-496 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We use a rate equation model to analyse a technique for the generation of picosecond duration laser pulses in argon pumped dye lasers. The system is based on passive mode-locking of the Ar+ laser by saturable absorption of the dye which is inserted in the Ar+ laser cavity. Simultaneously, the dye is forced to oscillate in a regime of synchronously pumped mode-locking. The system is relatively simple, does not require the use of an acousto-optical light modulator and can be easily implemented in commercially available lasers. Pulses shorter than 100 ps and having an average power of 20 mW were obtained at a repetition rate of 110 MHz. Good agreement between the model and experimental results was also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620017
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  • 9
    Electronic Resource
    Electronic Resource
    Character of the O–C Variation of Four W UMa Type Stars: AW UMa, AP Leo, AG Vir and AH Vir (1998)
    Springer
    Astrophysics and space science 260 (1998), S. 375-388 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analysis was carried out of the secular period variation of four WU Ma type stars (AW UMa, AP Leo, AG Vir and AH Vir) using some newly determined times of minima as well as others reported in the literature. It was found that two stars show period increases, one a period decrease and the remaining shows no variation in period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001726821949
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  • 10
    Electronic Resource
    Electronic Resource
    Synaptic vesicles and other organelles of human mossy fibre endings. A morphometric study (1978)
    Springer
    Cellular and molecular life sciences 34 (1978), S. 100-101 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The mossy fibre ending organelles of 6 men were studied, using morphometric methods. The numerical densities of agranular, coated and dense core vesicles, as well as the number of agranular vesicles per μm2 of the synaptic surface and per synapse were calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01921928
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