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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and thermal behaviour of adducts of [Mo(CN)8]3− and [W(CN)8]3− with 8-hydroxyquinoline (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1391-1398 
    Details
    ISSN: 1572-8943
    Keywords: adducts ; complexes ; 8-hydroxyquinoline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die hergestellten Addukte von [Mo(CN)8]3− und von [W(CN)8]3− mit 8-Hydroxyquinolin (Oxin) haben die allgemeine Formel K3[Mo(CN)8](C9H7ON)8·4H2O bzw. K3[W(CN)8](C9H7ON)6·3H2O. Die FTIR-Spektren beweisen die Gegenwart der (CN)- bzw. der Oxingruppen in den Adduktverbindungen durch die Peaks im Bereich 2047–2108 cm bzw. 1015–1461 cm−1. Die untere Region des FTIR-Spektrums zeigt die M=O Valenzschwingung, die obere Region (N-H) und (OH). Nichtkoordiniertes Wasser wird in diesen Addukten in einem einzigen Schritt bei 110°C abgegeben. Die Zersetzung der Adduktverbindungen beginnt bei 125°C und setzt sich in verschiedenen Schritten bis hin zu 850°C fort. Der zweite Schritt der Zersetzung wird durch die Abgabe von Oxinmolekülen beherrscht, wobei polymere Oxide der allgemeinen Formel K2OM2O5 (mitM= Mo oder W) als Pyrolyseprodukte erhalten werden.
    Notes: Abstract The adducts of [Mo(CN)8]3− and [W(CN)8]3− with 8-hydroxyquinoline (oxine) synthesized were of the type K3[Mo(CN)8]·(C9H7ON)8·4H2O and K3[W(CN)8]·(C9H7ON)6·3H2O. The FTIR spectra show the presence of the (CN) and oxine group in the adduct compounds through the peaks in the range 2047–2108 cm−1 and 1015–1461 cnf−1 respectively. The lower region of FTIR spectra show the M=O stretching while the higher range to v(N-H) and v(OH) modes. The uncoordinated water in these adducts was removed at around 110°C in a single step. The decomposition of adduct compounds starts from 125°C and continues to higher temperatures upto 850°C in different stages. The second stage of decomposition was predominant with the removal of oxine molecules with the formation of polymeric oxide of the type K2O·M2O5 (whereM=Mo or W) obtained as the pyrolysis product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01975072
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, characterization and thermal behaviour of adducts (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 1763-1774 
    Details
    ISSN: 1572-8943
    Keywords: adducts ; complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The photoproduct of octacyanomolybdate(IV) and -tungstate(IV) with ethylenediamine and triethylenetetramine give complexes of the type K3[Mo(O2)(O)(OH)(C9H7ON)]·3C9H7ON I, K2[W(O2)(O) (C9H7ON)3] II and K3[Mo(CN)3(OH)4(C9H7ON)]·2C9H7ON·3H2O III with 8-quinolinol (oxine). The IR spectra of the complex III shows the presence ofv(CN) peaks in the range 2047–2108 cm−1 and oxine groupv(C-O) in the complex I, II and III in the range of 1100–1150 cm−1. The lower region of IR spectra shows the M=O stretching while the higher thev(N-H) andv(OH). Thermal studies show the removal of uncoordinated water at 131
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980781
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  • 3
    Electronic Resource
    Electronic Resource
    Microangioarchitecture of the islets of Langerhans in the snakes,Naja naja, Vipera russelli, andEchis carinatus (1991)
    Springer
    Cell & tissue research 266 (1991), S. 83-88 
    Details
    ISSN: 1432-0878
    Keywords: Islets of Langerhans ; Microangioarchitecture ; Corrosion casts ; Scanning electron microscopy ; Naja naja, Vipera russelli, Echis carinatus (Serpentes)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Due to a decided lack in the literature of reports on the microangioarchitecture of the pancreas of snakes, an analysis was performed in three different species of two different ophidian families with the use of cast preparations and complementary scanning electron microscopy. The vascular architecture reflects the lobular substructure of the pancreas; the organ is supplied by branches of the superior mesentric artery. Coiled lobular arteries and arterioles continue into a meshwork of capillaries. Dilated capillaries of the endocrine portion of the pancreas are an integral component of this fine capillary network. A few very small capillaries establish a connection between the endocrine and the exocrine pancreas. The other capillaries drain into venules, which ultimately join their respective veins. No interspecific differences were noted in the vascularization of the pancreas of the three ophidian species examined. The present results suggest the existence of arterio-venous anastomoses and speak against the presence of a portal system, but establish a feed-forward capillary connection from the endocrine to the exocrine component of the ophidian pancreas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00678714
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  • 4
    Electronic Resource
    Electronic Resource
    Microvasculature of the pineal organ of the rainbow trout (Salmo gairdneri) (1987)
    Springer
    Cell & tissue research 250 (1987), S. 425-429 
    Details
    ISSN: 1432-0878
    Keywords: Pineal organ ; Angioarchitecture (capillaries,arteries, veins) ; Corrosion-cast preparation method ; Scanning electron microscopy ; Salmo gairdneri
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The angioarchitecture of the pineal organ of the rainbow trout (Salmo gairdneri) was investigated by means of the corrosion-cast preparation method and scanning electron microscopy. Two main arteries (aa. epiphyseales) supply the pineal parenchyma. They emerge from the aa. cerebri anteriores and run in the fissure between the prosencephalon and the mesencephalon. After entering the pineal stalk, the aa. epiphyseales branch off into several arterioles, most of which extend to the pineal end-vesicle where they give rise to a lobular, bilaterally symmetric capillary network. Capillaries establishing the main portion of the pineal vessels appear widened in comparison to those supplying other portions of the brain and resemble capillaries in other endocrine organs. In Salmo gairdneri, no specialized system of portal vessels appears to exist between the pineal organ and other portions of the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219087
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  • 5
    Electronic Resource
    Electronic Resource
    Vascular pattern in the pancreas of the cat (1982)
    Springer
    Cell & tissue research 223 (1982), S. 231-234 
    Details
    ISSN: 1432-0878
    Keywords: Pancreas (cat) ; Islet of Langerhans ; Vascularization ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pathways of microcirculation in the pancreas of the cat were investigated by scanning electron microscopy of Mercox preparations of the vascular bed. A portal system from islet to exocrine vessels as well as a direct arterial flow to the exocrine pancreas have been observed. Sphincters appear to exist in portal capillaries at the border between the endocrine and exocrine portions of the pancreas. Islets possess an independent venous drainage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221512
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