Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • K+ conductance  (2)
  • Lichen sclerosus et atrophicus  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Archives of gynecology and obstetrics 259 (1996), S. 45-50 
    ISSN: 1432-0711
    Schlagwort(e): Key words: Amelanotic melanoma ; Vulvar neoplasms ; Lichen sclerosus et atrophicus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. We report on a 60 year old patient with a 6 month history of vulval pruritus and an erosive vulval lesion which was mistaken for lichen sclerosus et atrophicus. Histologically the diagnosis of an amelanotic malignant melanoma of the vulva was established. We review the literature about this rare malignant tumor.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    ISSN: 1432-1173
    Schlagwort(e): Schlüsselwörter Vulvaneoplasie ; Amelanotisches malignes Melanom ; Lichen sclerosus et atrophicus ; Key words Vulvar neoplasia ; Amelanotic malignant melanoma ; Lichen sclerosus et atrophicus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Malignant melanoma of the vulva is an uncommon disease. The amelanotic subtype is only rarely mentioned. We report a 60-year-old patient with a 6 month history of vulvar pruritus. Ivory lesions combined with erosions and fine `cigarette paper' – like wrinkling were suspicious for lichen sclerosus et atrophicus. Histologically the diagnosis of an amelanotic malignant melanoma was made. Amelanotic melanoma may present with a wide variety of clinical features. Even in the uncommon location of the vulva, amelanotic melanoma should be suspected in any nonhealing nonpigmented lesion.
    Notizen: Zusammenfassung Das maligne Melanom der Vulva ist ein sehr seltener Tumor. Die amelanotische Variante ist nur in wenigen Fällen in der Literatur beschrieben. Wir berichten über eine 60jährige Patientin, die sich mit einer chronisch nässenden Vulvaläsion vorstellte. Die weißlichen Herde in Verbindung mit Erosionen und teilweise zigarettenpapierartiger Fältelung der Haut ließen klinisch v.a. an einen Lichen sclerosus et atrophicus denken. Histologisch zeigte sich ein amelanotisches malignes Melanom. Mit unserer Fallbeschreibung möchten wir ein weiteres Beispiel geben für die große morphologische Vielfalt des amelanotischen malignen Melanoms.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    ISSN: 1432-2013
    Schlagwort(e): Amiloride ; Cl− transport ; Diluting segment ; K+ conductance ; Adaptation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The hypothesis was tested whether amiloride and/or an acute acid load influence Cl− transport in the diluting segment of the isolated-perfused kidney of the K+ adapted frog (rana pipiens). Transepithelial resistance (luminal cable analysis) and Cl− net flux (Cl− sensitive microelectrodes) were evaluated at various concentrations of amiloride, at highpCO2 or low HCO 3 − in the kidney perfusate. Amiloride or an acute acid load increase transepithelial resistance. The resistance-change at given concentrations of amiloride is markedly enhanced under static head conditions, i. e. at low luminal NaCl concentrations. Amiloride or acidosis (highpCO2) reduce Cl− net reabsorption; combination of both potentiates this inhibitory effect. We conclude: an acute acid load acidifies the cell cytosol. This effect is aggravated dramatically after amiloride-induced inhibition of the luminal Na+/H+ exchanger. The luminal pH-sensitive K+ conductance decreases. This results in a depolarization of the cell membranes. Consequently, the peritubular electrochemical driving force for the exit step of Cl− (from cell to blood) dissipates. Therefore, Cl− net reabsorption is blunted.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Digitale Medien
    Digitale Medien
    Springer
    The journal of membrane biology 100 (1987), S. 43-51 
    ISSN: 1432-1424
    Schlagwort(e): frog kidney ; proximal tubule ; HCO 3 − transport ; K+ conductance ; Cl− conductance ; fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary Proximal tubular cells of the frog (Rana esculenta) kidney were fused within an isolated tubule portion to giant cells according to the polyethylene-glycol fusion method. Cell membrane potentials (V m ) were measured while cells were superfused with varioús experimental solutions. Rapid concentration stepchanges of different ions allowed to calculate the respective transference numbers (t ion). In some experiments the specific cell membrane resistances (R m ) were evaluated by measuringV m induced by short current pulses injected into the cell with a second electrode. The experiments reveal: i) Fused cells of the proximal tubule exhibit aV m of −49.5±1.6 mV (n=65). ii) Addition of glucose to the perfusate yields a transient depolarization, consistent with a rheogenic Na/glucose cotransport system. iii) In absence of organic substrates the whole cell membrane conductance is made up of K+ and HCO3, iv) There is a positive relationship betweenV m andtK+ and a negative relationship betweenV m andtHCO 3 − . v) HCO 3 − -inducedV m changes are attenuated or abolished when Na+ is replaced with choline+, consistent with a rheogenic Na+/HCO 3 − cotransport system. vi) Replacement of Na+ by choline+ depolarizesV m and increasesR m by about 50%; addition of 3 mmol/liter Ba2+ to the Na+-free perfusate increasesR m by about 58% compared to the initial control value. vii) There is no measurable cell membrane Cl− conductance. We conclude that fused cells of proximal tubule exert both luminal and peritubular membrane properties. In absence of organic substrates the cell membrane potential is determined by the HCO 3 − and K+ transport systems.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...