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  • GH  (2)
  • reticulocyte maturation  (2)
  • Apoplasm  (1)
  • Springer  (5)
  • American Institute of Physics
  • Copernicus
  • Public Library of Science
Collection
Keywords
Publisher
  • Springer  (5)
  • American Institute of Physics
  • Copernicus
  • Public Library of Science
Years
  • 1
    Electronic Resource
    Electronic Resource
    Influence of low doses of naloxone on pituitary secretion in man (1982)
    Springer
    European journal of clinical pharmacology 22 (1982), S. 213-216 
    Details
    ISSN: 1432-1041
    Keywords: naloxone ; haloperidol ; thyrotropin releasing hormone ; adenohypophyseal ; GH ; LH ; FSH ; PRL ; TSH ; cortisol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Naloxone 0.8 mg im administered to eight healthy subjects did not affect the serum levels of GH, LH, FSH, PRL, TSH and cortisol. Pretreatment with naloxone 0.8 mg increased TRH-induced TSH and PRL release in six healthy subjects. The same pretreatment caused an enhancement of haloperidol-induced PRL secretion in further other group of six subjects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545217
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  • 2
    Electronic Resource
    Electronic Resource
    Hormonal changes induced by a partial opiate antagonist, nalorphine. Evaluation of PRL, GH, TSH, LH, FSH and cortisol secretion (1981)
    Springer
    European journal of clinical pharmacology 21 (1981), S. 23-25 
    Details
    ISSN: 1432-1041
    Keywords: nalorphine ; hormonal changes ; cortisol ; PRL ; GH ; TSH ; LH ; FSH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects of nalorphine 5 mg i. m., a partial opiate antagonist, on circulating levels of PRL, GH, TSH, LH, FSH and cortisol were studied in six healthy men. Nalorphine produced a prompt and sharp increase in serum PRL and a small, delayed rise in serum GH. Serum LH and cortisol decreased after drug administration and no change in serum FSH and TSH was observed. These findings are discussed and a possible site of action of nalorphine is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609583
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Ca2+ and lipoxygenase inhibitors on hexokinase degradation in rabbit reticulocytes (1989)
    Springer
    Molecular and cellular biochemistry 85 (1989), S. 3-7 
    Details
    ISSN: 1573-4919
    Keywords: hexokinase degradation ; reticulocyte maturation ; Ca2+ ; SHAM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract In rabbit reticulocytes more than half of the total hexokinase activity is mitochondrial bound and shows a fast decay during reticulocyte maturation. During in vitro incubation of rabbit reticulocytes, Ca2+ increases the decay of hexokinase while salicylhydroxamate (SHAM), an inhibitor of lipoxygenase, reduces the decay. Swelling of mitochondria, by incubation of the cells in hypotonic solutions, greatly enhances hexokinase decay, but both the Ca2+ and SHAM are still appreciable suggesting that Ca2+ and the swelling act by additive mechanisms, both able to influence hexokinase decay. This was confirmed by incubation of rabbit brain mitochondria in hypotonic solutions which does not promote any hexokinase decay, while the presence of Ca2+ does. Analyses of hexokinase isozymic pattern after incubation of reticulocytes in hypotonic solution both with and without Ca2+ and SHAM showed that the decay of hexokinase mainly involves the mitochrondrial bound isozymic forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223508
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  • 4
    Electronic Resource
    Electronic Resource
    Hexokinase microheterogeneity in rabbit red blood cells and its behaviour during reticulocytes maturation (1988)
    Springer
    Molecular and cellular biochemistry 79 (1988), S. 133-136 
    Details
    ISSN: 1573-4919
    Keywords: hexokinase heterogeneity ; reticulocyte maturation ; (rabbit)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Hexokinase in rabbit reticulocytes is present in two molecular forms (hexokinase Ia and Ib) separable by ion-exchange chromatography on DE-52 columns. By the use of ion-exchange HPLC we have been able to show that the isozymic form we previously called hexokinase la can be resolved into two peaks of activity one of which is (Ia) soluble, the other (Ia*) particulate. Hexokinase Ia* can be solubilized by detergents like saponine and Triton X-100 and disappears during ‘in vivo’ reticulocytes maturation. This new hexokinase micro-heterogeneity is not caused by different oxidized forms of the enzyme nor influenced by the presence of proteolytic inhibitors during lysate preparation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02424555
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of apoplasmic and cell-to-cell components of root hydraulic conductance by a pressure-clamp technique (1996)
    Springer
    Planta 199 (1996), S. 296-306 
    Details
    ISSN: 1432-2048
    Keywords: Apoplasm ; Hydraulic conductance ; Pressure clamp technique ; Prunus (water relations) ; Root (hydraulic conductance) ; Water relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A pressure-clamp technique was devised for the direct measurement of cell-to-cell and apoplasmic components of root hydraulic conductance; the experimental results were analyzed in terms of a theoretical model of water and solute flow, based on a composite membrane model of the root. When water is forced under a constant pressure into a cut root system, an exponential decay of flow is observed, until a constant value is attained; when pressure is released, a reverse water flow out of the root system is observed which shows a similar exponential behavour. The model assumes that the transient flow occurs through a cell-to-cell pathway and the observed decrease is the result of accumulation of solutes in front of the root semi-permeable membrane, whilst the steady-state component results from the movement of water through the parallel apoplasmic pathway. Root conductance components are estimated by fitting the model to experimental data. The technique was applied to the root systems of potted cherry (Prunus avium L.) seedlings; average apoplasmic conductance was 15.5 × 10−9m3· s−1· MPa−1, with values ranging from 12.0 × 10−9 to 18.5 × 10−9m3· s−1· MPa−1; average cell-to-cell conductance was 11.7 × 109 m3· s−1· MPa−1, with values ranging from 8.5 × 10−9 to 15.3 × 10−9 m3 · s−1·MPa−1. Cell-to-cell conductance amounted on average to 43% of total root conductance, with values between 41 and 45%. Leaf specific conductance (conductance per unit of leaf area supported) of the root systems ranged from 2.7 × 10−8 to 5.6 × 10−8 m· s−1·MPa−1, with an average of 3.7 × 10−8 m · s−1·MPa−1. The newly developed technique allows the interaction of mass flow of water and of solutes to be explored in the roots of soil-grown plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196572
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