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  • 1
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    REPORTING DELAY: A REVIEW WITH A SIMULATION STUDY AND APPLICATION TO SPANISH AIDS DATA (1996)
    Wiley
    Details
    Publication Date: 1996-02-15
    Print ISSN: 0277-6715
    Electronic ISSN: 1097-0258
    Topics: Mathematics , Medicine
    Published by Wiley
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Nitrate storage by phytoplankton in a coastal upwelling environment (1997)
    Springer
    Marine biology 129 (1997), S. 399-406 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The storage of nitrate by phytoplankton cells during the early phases of upwelling was studied in coastal stations off northern Spain (southern Bay of Biscay) between 1990 and 1994. In this region, a persistent upwelling during summer is characterised by intermittent pulses of variable intensity, and increased nutrient concentrations in the surface layer. The main effect of an upwelling pulse on phytoplankton distribution is the shifting of the chlorophyll a and primary production maxima to near the surface. When the upwelling relaxes, thermal stratification of the water column occurs, and a distinct subsurface chlorophyll maximum develops below the production maximum. An accumulation of intracellular nitrate characterized the early phases of upwelling (mean = 2.73 μmol N m−3), maximum concentrations being attained at depths where biomass and production values were moderate. In contrast, phytoplankton cells from non-upwelling situations contained significantly lower concentrations of intracellular nitrate (mean = 0.17 μmol N m−3). The variations in the intracellular pool of nitrate may result from the differential allocation of resources within the cell as a result of variations in the energy available, since the uptake and assimilation of nitrate is a relatively expensive process involving several enzymatic systems. We hypothesize that nitrate storage by phytoplankton cells is characteristic of early phases of upwelling and is linked to patterns of carbon fixation. Average nitrogen budgets for upwelling and non-upwelling situations indicate that intracellular nitrate reserves are not responsible for maintaining high phytoplankton growth rates, since they only account for 〈2% of daily primary production during upwelling events.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050180
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  • 3
    Electronic Resource
    Electronic Resource
    Variability of biochemical composition and size distributions of seston in the euphotic zone of the Bay of Biscay: implications for microplankton trophic structure (1992)
    Springer
    Marine biology 114 (1992), S. 147-155 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Particle-size distributions and several biochemical components of seston were studied from October 1986 to December 1987 in surface waters of the Bay of Biscay. Variance partitioning of hydrographic and seston parameters indicates that, although seasonal variability related to the thermal cycle was important, most of the differences in seston concentration were caused by spatial components of variance. Changes in the vertical structure of the water column appeared to be the principal source of variability. Phytoplankton blooms in spring and fall and the effects of the coastal upwelling and the thermocline during summer were traced using seston concentration and biochemical composition. The different seston measurements were scaled according to their correlations with total concentration and particle size. Photosynthetic pigment biomass was related to both large and small partieles. However, concentrations of particulate proteins, lipids and carbohydrates were more related to small particles. Although not specifically analysed, low concentrations of inorganic particles and detritus can be expected in the study area, thus most of the particulate organic matter was associated with small, non-pigmented organisms, particularly in surface waters during the period of thermal stratification. The variability in concentrations of total seston and particulate organic matter was mainly due to variations in particulate proteins, lipids and carbohydrates; pigment concentrations were of secondary importance. Expressed as the ratio chlorophyll a: particulate protein-nitrogen, phytoplankton constituted an important fraction of the microplankton biomass only during spring blooms, when it averaged 75% of the particulate protein-nitrogen. In constrast, 〈30% of protein-nitrogen was related to chlorophyll a during the summer. These results suggest that an oligotrophic structure based on the “microbial-loop” prevails in microplankton assemblages of surface waters for most of the year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350864
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  • 4
    Electronic Resource
    Electronic Resource
    Production of DMSP and DMS during a mesocosm study of an Emiliania huxleyi bloom: influence of bacteria and Calanus finmarchicus grazing (1996)
    Springer
    Marine biology 126 (1996), S. 609-618 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated the influence of bacteria and metazooplankton on the production of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) during blooms of Emiliania huxleyi (Lohmann) Hay and Mohler in seawater mesocosms. The phytoplankton succession was marked by the rapid collapse of an initial Skeletonema costatum (Greville) Cleve bloom followed by a small E. huxleyi bloom. The collapse of the diatom bloom was accompanied by an increase in concentrations of dissolved DMSP (DMSPd) and bacterial abundance and activity (as determined by the thymidine incorporation technique). The increase in bacterial activity was followed by a rapid decrease in DMSPd concentrations which remained low for the rest of the experiment, even during the subsequent collapse of the E. huxleyi blooms. The absence of DMSPd and DMS peaks during the declining phase of the E. huxleyi blooms was attributed to the high bacterial activity prevailing at that time. The influence of metazooplankton grazing on DMSP and DMS production was investigated by adding moderate (24 mg dry weight m-3) and high (520 mg dry weight m-3) concentrations of Copepodite Stage V and adults of Calanus finmarchicus to two of four filtered (200 μm mesh net) enclosures during the E. huxleyi blooms. The addition of C. finmarchicus, even in high concentrations, had no apparent effect on the dynamics of E. huxleyi, suggesting that the copepods were not grazing significantly on nanophytoplankton. The addition of copepods in high concentrations favored an accumulation of chlorophyll a and particulate DMSP. These results suggest that copepods were preying on the herbivorous microzooplankton which, in turn, was controlling the biomass of nanophytoplankton. DMS production was also enhanced in the enclosure with maximum metazooplankton biomass, suggesting that the grazing of C. finmarchicus on microzooplankton containing DMSP may contribute to DMS production. These results provide strong support to the emerging idea that bacteria and metazooplankton grazing play a dominant role in determining the timing and magnitude of DMS pulses following phytoplankton blooms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351328
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  • 5
    Electronic Resource
    Electronic Resource
    Trinucleotide (CAG) repeat expansion in chromosomes of Spanish patients with Huntington's disease (1994)
    Springer
    Human genetics 〈Berlin〉 94 (1994), S. 563-564 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Huntington's disease (HD) is a neurodegenerative and hereditary disease characterized by progressive movement disorders and mental and behavioral abnormalities. The HD gene is an expanding and unstable trinucleotide repeat (CAG repeat sequences). We studied 77 individuals from 38 families with HD in an attempt to obtain information for genetic counselling and differential diagnosis. Our results indicate that individuals with more than 40 repeats will be affected by the disease, whereas those with fewer than 30 will be healthy. There can be some overlap between 30 and 40 repeats, and one should be careful when interpreting these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211028
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of the ΔF508 mutation in 194 Spanish cystic fibrosis families (1990)
    Springer
    Human genetics 〈Berlin〉 85 (1990), S. 396-397 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Spanish cystic fibrosis (CF) families (n = 194) have been analysed for the ΔF508 mutation, and for closely linked DNA markers. The ΔF508 mutation accounts for 50% of CF chromosomes. Four haplotypes are associated with the deletion, and at least seven haplotypes carry other mutations. The second major CF mutation is associated with pancreatic insufficiency and occurred in the same haplotype in which the ΔF508 arose. Only 31% of Spanish CF patients with no family history of the disease can be accurately diagnosed; about 50% of CF carriers can be detected in the Spanish population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02428272
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  • 7
    Electronic Resource
    Electronic Resource
    A point mutation changes the polymorphisms pattern in a cystic fibrosis carrier family (1992)
    Springer
    Human genetics 〈Berlin〉 89 (1992), S. 465-466 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194328
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  • 8
    Electronic Resource
    Electronic Resource
    Surimi-Derived Elver Substitutes: Microscopic Appearance and Physicochemical and Sensory Properties (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 67 (2002), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: : Elver substitutes made from kamaboko-type fish gels have recently been introduced onto the market in Spain. Kamaboko is made by addition of 2.5 to 3.0% salt, and optionally other additives, to surimi (minced fish). The present study investigated the usefulness of microscopy techniques for characterizing the structure and composition of two elver substitutes of this type. Sensory and physicochemical analyses were also performed, with the aim of defining the organoleptic characteristics of these products. The results obtained indicate that microscopy techniques are useful for rapid identification of certain additives in products of this type. Furthermore, many of the between-brand differences in microscopic appearance showed clear correspondence with differences in physicochemical and sensory properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.2002.tb11409.x
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  • 9
    Electronic Resource
    Electronic Resource
    A Lesion of the Follicle and of the Fibre of Wool and its Possible Relation with an Excess of Iron in the Forage (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 559-561 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The degeneration of the follicles (Fig. 3) is closely associated with this process of modification of the follicular bundles. The secondary follicles are lost because of: (a) their projection towards the surface and lack of activity of the bulb in producing a Malpighian epithelial small duct; (b) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/184559b0
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  • 10
    Electronic Resource
    Electronic Resource
    Cooperative regulation by ammonium and ammonium derivatives of nitrite uptake in Chlamydomonas reinhardtii
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 902 (1987), S. 287-292 
    Details
    ISSN: 0005-2736
    Keywords: (C. reinhardtii) ; Ammonium metabolism ; Inhibition ; Nitrite uptake ; l-Methionine sulfoximine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(87)90196-9
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