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49 results on '"Vogel, R M"'

2. Prediction of flow duration curves in ungauged basins

Author

Castellarin, A., primary, Botter, G., additional, Hughes, D. A., additional, Liu, S., additional, Ouarda, T. B. M. J., additional, Parajka, J., additional, Post, D. A., additional, Sivapalan, M., additional, Spence, C., additional, Viglione, A., additional, and Vogel, R. M., additional

Published
2013
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7. Runoff Prediction in Ungauged Basins Synthesis across Processes, Places and Scales

Author

Dunne, T, Blöschl, G, Sivapalan, M, Wagener, T, Viglione, A, Savenije, H, Goodrich, D, Gupta, H. V., Tachikawa, Y, Troch, P, Weiler, M, Mcglynn, B, Borga, M, Bormann, H, Hurkmans, R, Komma, J, Nandagiri, L, Uijlenhoet, R, Tetzlaff, D, Al Rawas, G, Carey, S. K., Fan, Y, Hrachowitz, M, Kirnbauer, R, Jewitt, G, Laudon, H, Mcguire, K. J., Sayama, T, Soulsby, C, Zehe, E, Mcmahon, T, Laaha, G, Parajka, J, Peel, M. C., Szolgay, J, Thompson, S, Woods, R, Yang, D, Weingartner, R, Hannah, D. M., Marks, D, Pearson, C, Rogger, M, Salinas, J. L., Sauquet, E, Srikanthan, S, Castellarin, A, Botter, G, Hughes, D. A., Liu, S, Ouarda, T. B. M. J., Post, D, Spence, C, Vogel, R. M., Demuth, S, Hisdal, H, Kroll, C. N., van Lanen, H. A. J., Nester, T, Tallaksen, L. M., Young, A, Rosbjerg, D, Burn, D. H., Croke, B, Di Baldassarre, G, Iacobellis, Vito, Kjeldsen, T, Kuczera, G, Merz, R, Montanari, A, Morris, D, Ren, L, Toth, E, Andréassian, V, Archfield, S, Bárdossya, Chiew, F, Duan, Q, Gelfan, A, Hlavčová, K, Mcintyre, N, Oudin, L, Perrin, C, Skøien, J. O., Zhang, Y, Biggs, T, Jia, S, Korytny, L. M., Gartsman, B, Pomeroy, J. W., Shook, K, Fang, X, Brown, T, Samuel, J, Coulibaly, P, Metcalfe, R. A., Humer, G, Rahman, A, Haddad, K, Weinmann, E, Blume, T, Crabit, A, Colin, F, Moussa, R, Winsemius, H, Liebe, J, van de Giesen, N, Walter, M. T., Steenhuis, T. S., Kennedy, J. R., Unkrich, C. L., Mazvimavi, D, Viney, N. R., Takeuchi, K, Hapuarachchi, H. A. P., Kiem, A. S., Ishidaira, H, Ao, T, Magome, J, Zhou, M. C., Georgievski, M, Wang, G, Yoshimura, C, Arheimer, B, Lindström, G, Mcdonnell, J, Schaake, J, Young, G, and Lin, S.

Published
2013

9. An assessment of exceedance probabilities of envelope curves

Author

Vogel, R. M., Matalas, N. C., England, J. F., Attilio Castellarin, R.M. Vogel, N.C. Matala, J.F. England, and A. Castellarin

Subjects
fungi, food and beverages
Abstract

Envelope curves are often used to provide summary accounts of our flood experience, but their operational use has been limited by our previous inability to assign to them an exceedance probability ‘‘EP.’’ General expressions are derived for the EP of an envelope curve at a particular site in a heterogeneous region, as well as measures of central tendency of EP across sites. Analytic results are reported for the case when floods follow a Gumbel or generalized extreme value distribution, and these results are contrasted with those of previous studies that sought to estimate the exceedance probability of extraordinary floods such as the flood of record (FOR) and the probable maximum flood (PMF). A case study involving FOR and PMF discharges for 226 rivers across the U.S.A. indicates that relatively consistent estimates of the average exceedance probability associated with both FOR and PMF envelope curves can be obtained using the theoretical approach introduced here.

Published
2007

45. Minimal effects of nitric oxide on spatial blood flow heterogeneity of the dog heart.

Author

Deussen A, Sonntag M, Flesche CW, and Vogel RM

Subjects
Animals, Arginine metabolism, Blood Pressure drug effects, Blood Pressure physiology, Bradykinin pharmacology, Dogs, Enzyme Inhibitors pharmacology, NG-Nitroarginine Methyl Ester pharmacology, Nitric Oxide Synthase antagonists & inhibitors, Ventricular Function, Coronary Circulation physiology, Nitric Oxide physiology
Abstract

Eleven Beagle dogs were studied to elucidate the possible role of L-arginine-derived nitric oxide on local blood flow distribution in left and right ventricular myocardium. Local blood flow was determined in 256 samples from the left and 64 samples from the right ventricle per heart using the tracer microsphere technique (mean sample mass 319 +/- 131 mg). Nitric oxide production was effectively inhibited by intravenous infusion of 20 mg/kg nitro-L-arginine methylester (L-NAME) as evidenced by a shift of the dose/response curve for the effect of intracoronary administration of bradykinin (0.004-4.0 nmol/min) on coronary blood flow. L-NAME enhanced left and right ventricular systolic pressures from 132 +/- 18 to 155 +/- 15 mm Hg and from 26 +/- 3 to 29 +/- 3 mm Hg respectively (both P = 0.043). Mean left ventricular blood flow was 1.14 +/- 0.38 before and 0.99 +/- 0.28 ml min-1 g-1 after L-NAME (P = 0.068), while right ventricular blood flow fell from 0.72 +/- 0.28 to 0.53 +/- 0.20 ml min-1 g-1 (P = 0.043). Coronary conductance of left and right ventricular myocardium fell by 31 and 43% respectively (both P = 0.043). The coefficient of variation of left ventricular blood flow was 0.26 +/- 0.07 before and 0.29 +/- 0.07 after L-NAME (P = 0.068), that of right ventricular blood flow was 0.27 before and after L-NAME. Skewness (0.51) and kurtosis (4.23) of left ventricular blood flow distribution were unchanged after L-NAME, while in the right ventricle skewness decreased from 0.54 to 0.09 (P = 0.043) and kurtosis (3.68) tended to decrease after L-NAME (P = 0.080). The fractal dimension (D = 1.20-1.27) and the corresponding nearest-neighbor correlation coefficient (rn = 0.37-0.53) of left and right ventricular myocardium remained unchanged after infusion of L-NAME. From these results it is concluded that firstly, local nitric oxide release does not explain the higher perfusion of physiological high flow samples and secondly, that spatial myocardial blood flow coordination is not dependent on nitric oxide.

Published
1997
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46. [Effect of arginine-dependent nitric oxide synthesis on regional perfusion of the eye in the anesthesized dog].

Author

Vogel RM, Sonntag M, and Deussen A

Subjects
Amino Acid Oxidoreductases antagonists & inhibitors, Animals, Arginine analogs & derivatives, Arginine pharmacology, Blood Flow Velocity drug effects, Blood Flow Velocity physiology, Choroid blood supply, Ciliary Body blood supply, Dogs, Endothelium, Vascular drug effects, Endothelium, Vascular physiology, Iris blood supply, NG-Nitroarginine Methyl Ester, Nitric Oxide antagonists & inhibitors, Nitric Oxide Synthase, Regional Blood Flow drug effects, Regional Blood Flow physiology, Retinal Vessels drug effects, Retinal Vessels physiology, Amino Acid Oxidoreductases physiology, Arginine physiology, Eye blood supply, Nitric Oxide biosynthesis
Abstract

The changes of the retinal and uveal perfusion after inhibition of the arginine-dependent nitric oxide (NO) synthesis by systemic administration of NG-nitro-L-arginine methyl ester (L-NAME; 20 mg/kg bw i.v.) were studied in four anesthetized dogs using the tracer microsphere technique. The regional perfusion rates (ml.min-1.g-1) under steady-state control conditions were: retina 0.13 +/- 0.05, choroid 8.26 +/- 1.85, iris 0.24 +/- 0.05 and ciliary body 1.11 +/- 0.26. Infusion of L-NAME over 10 min reduced the perfusion of the retina on the average by 23% (P > 0.05). The perfusion of choroid, iris and ciliary body fell by 54 +/- 8%, 58 +/- 7% and 53 +/- 8%, respectively (P < or = 0.05 for all). In five additional experiments the local activity of NO-producing enzymes (NO synthases) was determined by measuring the production rate of citrullin in tissue extracts of the different eye regions. Total NO synthase activities (pmol citrullin.min-1.g-1) were: retina 31.0 +/- 5.5, choroid 3.1 +/- 2.8, iris 7.1 +/- 2.1 and ciliary body 1.3 +/- 1.3. Differences of the total NO synthase activities of retina, iris and cilary body were statistically significant (P < or = 0.02). The results show that the uvea perfusion is largely influenced by the steady-state production of NO. The homogeneous flow reduction in the uvea after inhibition of NO synthase is contrasted by the heterogeneous NO synthase activities of the different uvea regions.(ABSTRACT TRUNCATED AT 250 WORDS)

Published
1994

49. Mechanisms of steatorrhea in the Zollinger-Ellison syndrome.

Author

Vogel RM, Weinstein LD, Herskovic T, and Spiro HM

Subjects
Adenoma, Islet Cell pathology, Atropine therapeutic use, Celiac Disease drug therapy, Enzyme Repression, Humans, Jejunum pathology, Male, Middle Aged, Pancreas enzymology, Celiac Disease physiopathology, Zollinger-Ellison Syndrome physiopathology
Published
1967
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