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  • Electronic Resource  (3)
  • Stomach  (2)
  • Binding isotherms  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cell proliferation and cell loss in intramucosal signet ring cell carcinoma of canine stomachs induced by N-ethyl-N′-nitro-N-nitrosoguanidine (1985)
    Springer
    Journal of cancer research and clinical oncology 110 (1985), S. 87-94 
    Details
    ISSN: 1432-1335
    Keywords: Stomach ; Signet ring cell carcinoma ; Cell turnover ; Tritiated thymidine autoradiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Signet ring cell carcinoma was induced in canine stomachs by N-ethyl-N′-nitro-N-nitrosoguanidine, and modes of cell proliferation and turnover in the carcinoma were studied by 3H-thymidine autoradiography in conjunction with morphometric analysis. From 2 to 15 months after the cessation of 8 months carcinogen treatment, carcinomas in an early stage were obtained. Most of the cancer tissues confined to the lamina propria showed a layered structure. This comprised three layers; the superficial and the deep layer were composed of signet ring cells, and the middle layer was composed of small round cells. The dogs were labeled with 3H-thymidine by s.c. injection and by local infusion of the celiac artery. Flash-labeled autoradiographs revealed that most 3H-thymidine incorporating cancer cells were located around the middle layer, with a small amount of mucin. Using a pulse labeling experiment, those labeled carcinoma cells were shown to migrate from the middle layer towards the surface. Morphometric analysis of the autoradiographs showed that the small cells in the middle layer migrated upwards and produced mucin to become full-blown signet ring cells by 5.5 days. In 15 days, most labeled cancer cells in the superficial layer had disappeared. This mode of cellular turnover appeared to mimic a cell renewal system of the normal gastric mucosa. If the cancer cells turn over in this way, the tumor must grow slowly, remaining as an intramucosal cancer for a relatively long period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402717
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Morphology and modes of cell proliferation in earliest signet-ring-cell carcinomas induced in canine stomachs byN-ethyl-N′-nitro-N- nitrosoguanidine (1991)
    Springer
    Journal of cancer research and clinical oncology 117 (1991), S. 197-204 
    Details
    ISSN: 1432-1335
    Keywords: Stomach ; Signet-ring-cell carcinoma ; Cell kinetics ; Bromodeoxyuridine ; N-ethyl-N′-nitro-N-nitrosoguanidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Signet-ring-cell carcinomas were induced in the stomach of 12 beagle dogs by p.o. administration ofN-ethyl-N′-nitro-N-nitrosoguanidine (ENNG), and the morphology and modes of cell proliferation in an incipient stage of cancer growth were studied with bromodeoxyuridine (BrdUrd) incorporation. From 5 to 27 months after the completion of 8 months' carcinogen treatment, minute carcinomas were found in the stomachs of 9 dogs. Before sacrifice, the dogs were given a single or repeated i.v. injections of BrdUrd for 1–3 days. Minute signet-ring-cell carcinomas were found to form a layered structure, in which the cancer cells proliferated in the lamina propria at the gland-neck level and differentiated to postmitotic signet-ring cells at the upper and lower levels of the mucosa. From repeated injections of BrdUrd, the time required for all the proliferative cells to be labelled with BrdUrd (reflecting the maximum cellcycle time) was estimated to be 1.7 days for the normal glands, and 2.7 days for minute signet-ring-cell carcinomas. From the labelling index with BrdUrd as well as from the morphology, earliest carcinomas were identified in the single gland. There remained atrophic normal epithelium commonly in the single-gland lesions. Proliferative atypical cells appeared to be shed into the stroma passively through the atrophy and subsequent collapse of the gland rather than through active invasion. This may be a reason why cancer cells in minute signet-ring cell carcinomas preserved the normal pattern of cell renewal movement to form the layered structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625425
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Binding characteristics of ionic surfactants with human hair (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 798-802 
    Details
    ISSN: 1435-1536
    Keywords: Binding isotherms ; ionic surfactants ; human hair ; thermodynamic parameReferences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Binding isotherms of two types of ionic surfactants, CmH2m +1SO4Na (m = 8,10,12) and CnH2n + 1N+(CH3)3C1 (n=10, 12), to human hair in aqueous solutions were examined to clarify effects of hydrophobic and electrostatic interaction of ionic surfactants with hair. The binding isotherms of anionic surfactants showed cooperativity with discontinuously increasing shapes, while the binding isotherms of cationic surfactants showed a Langmuir-type, regardless of the difference of a hair condition. The calculated free energy change (— ΔG@#@) for binding, obtained from Klotz' plots, suggests that the binding processes are governed mainly by a hydrophobic interaction, and bound surfactants probably expose their alkyl chains to the aqueous phase, since no-ΔG was observed with the increase of m or n and values of enthalpy change(ΔH) were positive or zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01500756
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    Paper (German National Licenses)
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