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  • 1
    Electronic Resource
    Electronic Resource
    Characterization and distribution of esterase electromorphs in the whitefly,Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) (1995)
    Springer
    Biochemical genetics 33 (1995), S. 205-214 
    Details
    ISSN: 1573-4927
    Keywords: Bemisia tabaci ; Bemisia argentifolii ; cotton whitefly ; squash silverleaf disorder ; sweetpotato whitefly ; tobacco whitefly ; virus vector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Esterase profiles were examined for over 40 populations of the whitefly,Bemisia tabaci, obtained from native and cultivated plant hosts worldwide. Twelve unique electromorphs were identified from distinct populations concentrated largely in Central America, Africa, and India. One electromorph, type B, has recently been proposed as a separate species,Bemisia argentifolii, and has recently spread throughout much of the world. When considered with evidence from mating studies and the ability to induce phytotoxic disorders (squash silverleaf disorder), our data suggest that the single taxonBemisia tabaci may actually represent a species complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02401851
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization and distribution of esterase electromorphs in the whitefly,Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) (1995)
    Springer
    Biochemical genetics 33 (1995), S. 205-214 
    Details
    ISSN: 1573-4927
    Keywords: Bemisia tabaci ; Bemisia argentifolii ; cotton whitefly ; squash silverleaf disorder ; sweetpotato whitefly ; tobacco whitefly ; virus vector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Esterase profiles were examined for over 40 populations of the whitefly,Bemisia tabaci, obtained from native and cultivated plant hosts worldwide. Twelve unique electromorphs were identified from distinct populations concentrated largely in Central America, Africa, and India. One electromorph, type B, has recently been proposed as a separate species,Bemisia argentifolii, and has recently spread throughout much of the world. When considered with evidence from mating studies and the ability to induce phytotoxic disorders (squash silverleaf disorder), our data suggest that the single taxonBemisia tabaci may actually represent a species complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553619
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Morphological variation inBemisia endosymbionts (1995)
    Springer
    Protoplasma 189 (1995), S. 194-202 
    Details
    ISSN: 1615-6102
    Keywords: Bacteria ; Bemisia tabaci ; Bemisia argentifolii ; Endosymbionts ; Microorganism ; Symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ultrastructure of the endosymbionts of several populations of whitefly (Homoptera: Aleyrodidae) was examined using transmission electron microscopy. Consistent differences in morphology and relative number of endosymbionts were observed between species and biotypes of whitefly within the Bemisia taxon.Bemisia argentifolii (=B. tabaci B biotype) individuals from Hawaii, Florida, and Arizona contained two morphological types of microorganisms housed within the mycetocyte cells of immature whiteflies. In contrast, individuals from populations ofB. tabaci A biotype from Arizona and Mexico, andB. tabaci Jatropha biotype from Puerto Rico, consistently contained three distinct morphological types of microorganisms within their mycetocytes. Organisms fromB. tabaci A and Jatropha biotypes differed from each other in the relative frequency of each type of microorganism. These observations suggest that different whitefly biotypes may have variable combinations of micro-fauna, with some possibly unique to each group, and furthers the hypothesis that variation in whitefly endosymbionts may be associated with the development of biotypes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01280174
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Angiotensin II binding to tissues of the rainbow trout, Oncorhynchus mykiss, studied by autoradiography (1992)
    Springer
    Journal of comparative physiology 162 (1992), S. 197-202 
    Details
    ISSN: 1432-136X
    Keywords: Angiotensin II ; Autoradiography ; Seawater-adaptation ; trout, Oncorhynchus mykiss (= Salmogairdneri)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Tissue slices from seawater-adapted and freshwater-adapted rainbow trout, Oncorhynchus mykiss, were exposed to 125I-angiotensin II (1.01·10-9 M) and binding sites located by light-microscopic autoradiography. Binding/uptake was significantly inhibited by excess (10-5 M) unlabelled angiotensin II, suggesting specific binding/uptake of angiotensin II to the ventral and dorsal aorta (smooth muscle), urinary bladder (smooth muscle and epithelial lining), glomeruli and proximal tubules, the gill (lamellae and central filament), skin (epithelium), intestine and oesophagus (mucosal epithelium), liver, heart (ventricular myocytes), adrenocortical tissue and brain (cerebellum and medulla oblongata). The specific binding/uptake of angiotensin II to tissues of freshwater- and seawater-adapted animals were generally similar. However, binding/uptake by the proximal tubules was significantly higher in freshwater-adapted trout than seawater-adapted trout. Specific binding/uptake of angiotensin II by the smooth muscle of the bladder was significantly higher in trout adapted to seawater than trout adapted to freshwater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357523
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Direct effects of angiotensin II on glomerular ultrastructure in the rainbow trout, Salmo gairdneri (1990)
    Springer
    Cell & tissue research 260 (1990), S. 315-319 
    Details
    ISSN: 1432-0878
    Keywords: Glomerulus ; Angiotensin II ; Glomerular ultrastructure ; Seawater adaptation ; Salmo gairdneri (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Slices from the kidneys of the rainbow trout which were exposed to 10-6 or 10-5 M angiotensin II (AII) and isolated glomeruli exposed to 10-7 or 10-5 M AII showed ultrastructural changes compared to control tissues incubated without AII. The studies indicate that angiotensin II has a direct action on glomerular ultrastructure, flattening the epithelial podocytes and broadening the primary processes with fusion of pedicels in extreme cases. These changes suggest a probable effect of AII on water permeability of the trout glomerulus, an intrarenal action which is believed to form an essential part of the antidiuretic adaptation to increased environmental salinities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318634
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Glomerular ultrastructure of the trout, Salmo gairdneri: Effects of angiotensin II and adaptation to seawater (1987)
    Springer
    Cell & tissue research 249 (1987), S. 437-442 
    Details
    ISSN: 1432-0878
    Keywords: Angiotensin II ; Glomerulus ; Salmo gairdneri ; Seawater-adaptation ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The effect of angiotensin infusion on the glomerular ultrastructure of freshwater- and seawater-adapted rainbow trout, Salmo gairdneri, has been examined by scanning and transmission electron microscopy. Adaptation of trout to seawater resulted in epithelial podocyte flattening, primary process broadening and apparent loss of foot processes in almost all glomeruli, features which were uncommon in freshwater-adapted trout. Similar changes were induced by infusion of freshwater-adapted animals with angiotensin, suggesting that the renin-angiotensin system plays a role in the modification of glomerular epithelial ultrastructure. Adaptation of trout to seawater also reduced glomerular diameter, but infusion of freshwater-adapted animals with angiotensin did not mirror this effect. Infusion of angiotensin into seawater-adapted animals increased the overall thickness of glomerular basement membrane by increasing the lamina rara interna and lamina densa. This did not occur when freshwater-adapted fish were either infused with angiotensin or adapted to seawater. These findings suggest that other humoral systems are involved in the control of glomerular diameter and basement membrane thickness as part of an integrated response to increased environmental salinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215528
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Glomerular binding of angiotensin II in the rainbow trout,Salmo gairdneri (1990)
    Springer
    Cell & tissue research 259 (1990), S. 479-482 
    Details
    ISSN: 1432-0878
    Keywords: Kidney ; Glomerulus ; Angiotensin II ; Salmo gairdneri (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Isolated glomeruli of the rainbow trout have been exposed in vitro to125I-angiotensin II (0.88 × 10−9 M) and binding sites located by light-microscopic autoradiography. These studies provide evidence of specific binding of angiotensin II by glomeruli. Binding was significantly inhibited by excess (10−5 M) unlabelled angiotensin II, but a high degree of non-specific binding also occurred. The mammalian competitive antagonist, saralasin (3 × 10−7 M) did not influence125I-angiotensin II binding to fish glomeruli. Intense binding of125I-angiotensin II was noted at the vascular pole of some glomeruli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740774
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    Paper (German National Licenses)
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