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Fromm M, Schulzke JD, Hegel U (1993) Control of electrogenic Na+ absorption in rat late distal colon by nanomolar aldosterone added in vitro. Am. J. Physiol. 264: E68-E73 [PubMed] [PDF]
Hegel U, Fromm M, Kreusel KM, Wiederholt M (1993) Bovine and porcine large intestine as model epithelia in a student lab course. Am. J. Physiol. 265: S10-S19 [PubMed] [PDF] (Comment: 1996 we switched to rabbit distal colon which we obtain from a rabbit slaughtery nearby Berlin)
Fischer H, Kreusel KM, Illek B, Machen TE, Hegel U, Clauss W (1992) The outwardly rectifying Cl- channel is not involved in cAMP-mediated Cl- secretion in HT-29 cells: evidence for a very-low-conductance Cl- channel. Pflügers Arch. 422: 159-167 [PubMed]
Illek B, Fischer H, Kreusel KM, Hegel U, Clauss W (1992) Volume-sensitive basolateral K+ channels in HT-29/B6 cells: block by lidocaine, quinidine, NPPB, and Ba2+. Am. J. Physiol. 263: C674-C683 [PubMed] [PDF]
Fromm M, Hegel U, Wiederholt M (1991) Epithelien. In: Pathophysiologie des Menschen, Kapitel 5, K. Hierholzer und R.F. Schmidt eds., edition medizin VCH, Weinheim, S. 5.1-5.19 [Textbook of Pathophysiology]
Kreusel KM, Fromm M, Schulzke JD, Hegel U (1991) Cl- secretion in epithelial monolayers of mucus-forming human colon cells (HT-29/B6). Am. J. Physiol. 261: C574-C582. [PubMed] [PDF]
Fromm M, Schulzke JD, Hegel U (1990) Aldosterone low dose, short term action in adrenalectomized glucocorticoid-substituted rats: Na, K, Cl, HCO3, osmolyte, and water transport in proximal and rectal colon. Pflügers Arch. 416: 573-579. [PubMed]
Fromm M, Tykocinski M, Schulzke JD, Hegel U, Bentzel CJ (1990) pH-dependence of protamine action on apical membrane permeability in Necturus gallbladder epithelium. Biochim. Biophys. Acta 1027: 179-184. [PubMed]
Hegel U, Fromm M (1990) Electrical measurements in large intestine (including colon, rectum, caecum). Methods Enzymol. 192: 459-484. [PubMed reference] [PDF]
Schulzke JD, Fromm M, Hegel U, Riecken EO (1989) Ion transport and enteric nervous system (ENS) in rat rectal colon: Mechanical stretch causes electrogenic Cl-secretion via Plexus Meissner and amiloride-sensitive electrogenic Na-absorption is not affected by intramural neurons. Pflügers Arch. 414: 216-221. [PubMed]
Bentzel CJ, Fromm M, Palant CE, Hegel U (1987) Protamine alters structure and conductance of Necturus gallbladder tight junctions without major electrical effects on the apical cell membrane. J. Membr. Biol. 95: 9-20. [PubMed]
Fromm M, Hegel U (1987) Net ion fluxes and zero flux limiting concentrations in rat upper colon and rectum during anaesthesia-induced aldosterone liberation. Pflügers Arch. 408: 185-193. [PubMed]
Schulzke JD, Fromm M, Hegel U (1986) Epithelial and subepithelial resistance of rat large intestine: Segmental differences, effect of stripping, time course, and action of aldosterone. Pflügers Arch. 407: 632-637 [PubMed]
Fromm M, Palant CE, Bentzel CJ, Hegel U (1985) Protamine reversibly decreases paracellular cation permeability in Necturus gallbladder. J. Membr. Biol. 87: 141-150. [PubMed]
Fromm M, Schulzke JD, Hegel U (1985) Epithelial and subepithelial contributions to transmural electrical resistance of intact rat jejunum, in vitro. Pflügers Arch. 405: 400-402. [PubMed]
Fromm M, Oelkers W, Hegel U (1983) Time course of aldosterone and corticosterone plasma levels in rats during general anaesthesia and abdominal surgery. Pflügers Arch. 399: 249-254. [PubMed]
Fromm M, Weskamp P, Hegel U (1980) Versatile piezoelectric driver for cell puncture. Pflügers Arch. 384: 69-73 [PubMed]
Gutsche HU, Hegel U (1980) Influence of aldosterone on epithelial leakiness of rat proximal tubules. Microconductivity Measurements. Pflügers Arch. 385: 29-36. [PubMed]
Gutsche HU, Müller-Suur R, Hegel U, Hierholzer K (1980) Electrical conductivity of tubular fluid of the rat nephron. Pflügers Arch. 383: 113-121 [PubMed reference]
Fromm M, Hegel U (1978) Segmental heterogeneity of epithelial transport in rat large intestine. Pflügers Arch. 378: 71-83 [PubMed]
Gutsche HU, Müller-Suur R, Hegel U, Hierholzer K, Lüderitz S (1975) A new method for intratubular blockade in micropuncture experiments. Pflügers Arch. 354: 197-202 [PubMed]
Lange S, Hegel U, Hierholzer K (1974) Die Wirkung von Aldosteron auf den transepithelialen Salztransport und ihre Untersuchung mit elektrophysiologischen Methoden. Med. Klinik 69: 1478-1488 [PubMed reference]
Hierholzer K, Hegel U (1971) Die osmotische Diurese. Med. Klinik 66: 255-264 [PubMed reference]
Frömter E, Wick T, Hegel U (1967) [Studies on the ejection method for the localization of microelectrode tips in potential measurements on the proximal convoluted tubule of the rat kidney] Pflügers Arch. 294: 265-273 [PubMed reference]
Hegel U, Frömter E, Wick T (1967) [Transmural electrical resistance of the proximal convoluted rat kidney tubule]. Pflügers Arch. 294: 274-290 [PubMed reference]
Frömter E, Hegel U (1966) [Transtubal potential differences in proximal and distal tubules of the rat kidney]. Pflügers Arch. 291: 107-120 [PubMed reference]
Hegel U, Frömter E (1966) [Experience with the oil droplet method in location of the microelectode point in transtubular potentiometry of the rat kidney]. Pflügers Arch. 291: 121-128 [PubMed reference]