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  • nitrogen  (7)
  • Immunohistochemistry  (6)
  • Springer  (12)
  • Elsevier  (1)
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  • Springer  (12)
  • Elsevier  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Persea indica as a natural source of the insecticide ryanodol
    Amsterdam : Elsevier
    Phytochemistry 34 (1993), S. 397-400 
    Details
    ISSN: 0031-9422
    Keywords: Lauraceae ; Persea indica ; diterpene ; insecticide ; nitrogen ; phenolics ; ryanodol ; variation.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(93)80016-L
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  • 2
    Electronic Resource
    Electronic Resource
    Noradrenergic and adrenergic systems in the brain of the urodele amphibian, Pleurodeles waltlii, as revealed by immunohistochemical methods (1995)
    Springer
    Cell & tissue research 279 (1995), S. 619-627 
    Details
    ISSN: 1432-0878
    Keywords: Brain ; Noradrenaline ; Adrenaline ; Immunohistochemistry ; Pleurodeles waltlii (Urodela)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The distribution of noradrenaline and adrenaline in the brain of the urodele amphibian Pleurodeles waltlii has been studied with antibodies raised against noradrenaline and the enzymes dopamine-β-hydroxylase and phenylethanolamine-N-methyltransferase. Noradrenaline-containing cell bodies were found in the anterior preoptic area, the hypothalamic nucleus of the periventricular organ, the locus coeruleus and in the solitary tract/area postrema complex at the level of the obex. Noradrenergic fibers are widely distributed throughout the brain innervating particularly the ventrolateral forebrain, the medial amygdala, the lateral part of the posterior tubercle, the parabrachial region and the ventrolateral rhombencephalic tegmentum. Putative adrenergic cell bodies were found immediately rostral to the obex, ventral to the solitary tract. Whereas the cell bodies and their dendrites were Golgi-like stained, axons were more difficult to trace. Nevertheless, some weakly immunoreactive fibers could be traced to the basal forebrain. A comparison of these results with data previously obtained in anurans reveals not only several general features, but also some remarkable species differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318174
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  • 3
    Electronic Resource
    Electronic Resource
    Sauvagine-like and corticotropin-releasing factor-like immunoreactivity in the brain of the bullfrog (Rana catesbeiana) (1988)
    Springer
    Cell & tissue research 253 (1988), S. 29-37 
    Details
    ISSN: 1432-0878
    Keywords: Sauvagine ; Corticotropin-releasing factor ; Hypothalamus ; Immunohistochemistry ; Anterior preoptic area ; Median eminence ; Pars nervosa ; Pars intermedia, of pituitary ; (Anura) Rana catesbeiana
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Immunocytochemical methods were used to investigate the occurrence and distribution of sauvagine, corticotropin-releasing factor-, or urotensin I-like immunoreactivities (SVG-ir, CRF-ir, UI-ir, respectively) in the bullfrog (Rana catesbeiana) brain, using specific antisera raised against non-conjugated SVG, ovine CRF, rat/human CRF, and UI. In the hypothalamus, SVG-ir was found in the magnocellular perikarya, in the dorsal and ventral regions of the preoptic nucleus, and in the hypothalamo-hypophyseal projections to the external zone as well as the internal zone of the median eminence, to pars nervosa, and in fibres running from the pars nervosa to the pars intermedia of the pituitary. In contrast, CRF-ir was found only in parvocellular perikarya, mainly localized in the rostro-ventral part of the preoptic nucleus, with fine processes protruding through the ependyma of the third ventricle, fibre projections terminating in the anterior preoptic area and in the neuropil of the periventricular gray, and a caudal projection to the external zone of the median eminence. No CRF-ir staining was seen in the pars nervosa and pars intermedia. The use of UI-specific antisera failed to give a positive response in the frog brain. It is concluded that, in the frog brain, two anatomically different CRF-like (or SVG-like) systems co-exist, comparable to the reported co-existence of UI-ir and CRF-ir neuronal systems in fish brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221736
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  • 4
    Electronic Resource
    Electronic Resource
    Distribution of vasotocin- and mesotocin-like immunoreactivities in the brain of Typhlonectes compressicauda (Amphibia, Gymnophiona): further assessment of primitive and derived traits of amphibian neuropeptidergic systems (1997)
    Springer
    Cell & tissue research 287 (1997), S. 305-314 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Central nervous system ; Vasotocin ; Mesotocin ; Comparative evolution ; Immunohistochemistry ; Typhlonectes compressicauda (Gymnophiona)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. To further assess primitive and derived conditions, we have studied the vasotocinergic (AVT) and mesotocinergic (MST) systems by immmunohistochemistry in the brain of Typhlonectes compressicauda. This species belongs to a separate order of amphibians which differs in several morphological and behavioral aspects from anurans and urodeles which have been studied previously. Nevertheless, the vasotocinergic and mesotocinergic systems of T. compressicauda are largely comparable to those of other amphibians. Apart from a well-developed hypothalamo-hypophysial system, extrahypothalamic AVT-and MST-immunoreactive groups of cells and extensive networks of fibers were found. A major difference, however, is that neuropeptidergic cells in the caudal hypothalamus and the midbrain tegmentum of T. compressicauda contain MST, whereas those in corresponding locations contain AVT in anurans and urodeles. This suggests that certain neuropeptidergic cell groups in the gymnophionan brain have switched from AVT to MST gene expression, and, thereby, offers a new view on the functional significance of these neuropeptidergic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050755
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  • 5
    Electronic Resource
    Electronic Resource
    Noradrenergic and adrenergic systems in the brain of the urodele amphibian, Pleurodeles waltlii, as revealed by immunohistochemical methods (1995)
    Springer
    Cell & tissue research 279 (1995), S. 619-627 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Brain ; Noradrenaline ; Adrenaline ; Immunohistochemistry ; Pleurodeles waltlii (Urodela)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The distribution of noradrenaline and adrenaline in the brain of the urodele amphibian Pleurodeles waltlii has been studied with antibodies raised against noradrenaline and the enzymes dopamine-β-hydroxylase and phenylethanolamine-N-methyltransferase. Noradrenaline-containing cell bodies were found in the anterior preoptic area, the hypothalamic nucleus of the periventricular organ, the locus coeruleus and in the solitary tract/area postrema complex at the level of the obex. Noradrenergic fibers are widely distributed throughout the brain innervating particularly the ventrolateral forebrain, the medial amygdala, the lateral part of the posterior tubercle, the parabrachial region and the ventrolateral rhombencephalic tegmentum. Putative adrenergic cell bodies were found immediately rostral to the obex, ventral to the solitary tract. Whereas the cell bodies and their dendrites were Golgi-like stained, axons were more difficult to trace. Nevertheless, some weakly immunoreactive fibers could be traced to the basal forebrain. A comparison of these results with data previously obtained in anurans reveals not only several general features, but also some remarkable species differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050321
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  • 6
    Electronic Resource
    Electronic Resource
    Macrophages within the human adrenal gland (1994)
    Springer
    Cell & tissue research 278 (1994), S. 201-205 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Macrophages ; Adrenal cortex ; Chromaffin cells ; Immunohistochemistry ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. There is increasing evidence for an immune-adrenal interaction in which macrophages may play an important role. However, few data are available with respect to a human intra-adrenal macrophage system. In this study, we have investigated the density, distribution and phenotype of human adrenal macrophages using monoclonal antibodies. Macrophages are localized in all zones of the adrenal gland. These cells exhibit the phenotype of the phagocytotic macrophage compartment (CD11c+, KiM8+). At the ultrastructural level, macrophages are frequently attached to the endothelial wall, but also lie in direct contact with cortical and chromaffin cells. This investigation reveals the cellular basis for the possible role of macrophages in the local immune-neuroendocrine axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414161
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  • 7
    Electronic Resource
    Electronic Resource
    Macrophages within the human adrenal gland (1994)
    Springer
    Cell & tissue research 278 (1994), S. 201-205 
    Details
    ISSN: 1432-0878
    Keywords: Macrophages ; Adrenal cortex ; Chromaffin cells ; Immunohistochemistry ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract There is increasing evidence for an immune-adrenal interaction in which macrophages may play an important role. However, few data are available with respect to a human intra-adrenal macrophage system. In this study, we have investigated the density, distribution and phenotype of human adrenal macrophages using monoclonal antibodies. Macrophages are localized in all zones of the adrenal gland. These cells exhibit the phenotype of the phagocytotic macrophage compartment (CD11c+, KiM8+). At the ultrastructural level, macrophages are frequently attached to the endothelial wall, but also lie in direct contact with cortical and chromaffin cells. This investigation reveals the cellular basis for the possible role of macrophages in the local immune-neuroendocrine axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00414161
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  • 8
    Electronic Resource
    Electronic Resource
    Comparison between a chemical and a biological method to determine the N mineralization potential of temperate-humid region soils (1994)
    Springer
    Plant and soil 162 (1994), S. 147-150 
    Details
    ISSN: 1573-5036
    Keywords: biological method ; chemical method ; mineralization potential ; nitrogen ; soil incubation ; temperate humid-zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The potentially mineralizable organic N of 33 different soils was estimated by a chemical test (hot extraction with 2N KCl) and the values compared with those previously obtained by a biological method (aerobic incubation in the laboratory). On average, the organic N solubilized by the chemical procedure was significantly lower than that mineralized by a two weeks aerobic incubation for all the soils as a whole. The same was true for soils developed over acid rocks and over sediments. However, the values obtained for the soils developed over limestone and basic rocks were similar by both methods. The values obtained by both methods were not significantly correlated neither when considering all soils together nor when considering different groups according to soil management or parent material. Significant correlations between both methods were only found when the soils were separated into two groups according to their organic N content: soils with less than 400 mg N 100 g−1 soil and soils with more than 400 mg N 100 g−1 soil. The organic N solubilized by the chemical procedure was significantly correlated with the hexosamine-N content; however, it was not correlated with the factors that control the biological mineralization of the organic N, except with the soluble Al content. Therefore, the chemical extraction did not seem to address the biologically active N pool in a selective way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01416100
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  • 9
    Electronic Resource
    Electronic Resource
    Nitrogen mineralization and its controlling factors in various kinds of temperate humid-zone soils (1992)
    Springer
    Plant and soil 144 (1992), S. 31-44 
    Details
    ISSN: 1573-5036
    Keywords: mineralization capacity ; nitrogen ; principal components analysis ; soil incubation ; temperate humid zone ; soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The N mineralization capacity of 41 temperate humid-zone soils of NW Spain was measured by aerobic incubation for 15 days at 28°C and 75% of field capacity. The main soil factors affecting organic N dynamics were identified by principal components analysis. Ammonification predominated over nitrification in almost all soils. The mean net N mineralization rate was 1.63% of the organic N content, and varied according to soil parent materials as follows: soils on basic and ultrabasic rocks 〈 soils over acid metamorphic rocks 〈 soils developed over sediments 〈 soils over acid igneous rocks 〈 soils on limestone. The N mineralization capacity was lower in natural soils than in cropped soils or pastures. The accumulation of organic matter (C and N) seems to be due to poor mineralization which was caused, in decreasing order of importance, by high exchangeable H-ion levels, high Al and Fe gel contents and, to a lesser extent (though more markedly in cropped soils), by silty clay texture and exchangeable Al ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018842
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  • 10
    Electronic Resource
    Electronic Resource
    Competition for N and P between wheat and wild oats (Avena sterilis L.) according to the proximity of their time of emergence (1987)
    Springer
    Plant and soil 102 (1987), S. 133-136 
    Details
    ISSN: 1573-5036
    Keywords: competition ; nitrogen ; nutrition ; phosphorus ; wheat ; wild oats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the cultivated wheat fields of the Mediterranean area, wild oats (Avena sterilis L.), is commonly found a weed, which competes with the wheat for soil nutrients, water and light. To study this mutual competition for N and P, a pot experiment was devised in which the planting of wheat and weed seeds, in the pots, was so arranged that the lengths of time between the emergence of each specie was different for each treatment. When the time of emergence of the wild oat coincided with that of wheat, the latter was affected in its development, productivity and total accumulation of N and P. However, the earlier the emergence of wheat was relative to that of wild oat, the greater was the suppression of the weed, with a lower total accumulation of N and lower P content in the plant. Bringing forward the emergence of either of the two species conferred advantages for the development of the earliest emerger.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370914
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