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  • Springer  (11)
  • American Heart Association (AHA)
  • Institute of Physics Publishing (IOP)
  • Nature Publishing Group (NPG)
  • Oxford University Press
  • PANGAEA
  • 2010-2014
  • 1990-1994
  • 1975-1979  (10)
  • 1970-1974
  • 1915-1919
  • 1870-1879  (1)
  • 1978  (7)
  • 1976  (3)
  • 1871  (1)
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  • Springer  (11)
  • American Heart Association (AHA)
  • Institute of Physics Publishing (IOP)
  • Nature Publishing Group (NPG)
  • Oxford University Press
  • +
Years
  • 2010-2014
  • 1990-1994
  • 1975-1979  (10)
  • 1970-1974
  • 1915-1919
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Year
  • 1
    ISSN: 1432-1440
    Keywords: Cushing-Syndrom ; Hypertonie ; Renin-Aktivität ; Aldosteronismus ; Cushing's syndrome ; Hypertension ; Renin activity ; Aldosteronism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary To investigate the role of the renin angiotensin system in the pathogenesis of hypertension in Cushing's syndrome two patients with hypercorticism were infused with 20 mg saralasin (1-sar-8-alaangiotensin II) over a period of 30 minutes under constant blood pressure control. In addition, one patient with primary aldosteronism, an established form of mineralocorticoid hypertension, served as control. Neither in the two patients with Cushing's syndrome nor in the patient with primary aldosteronism could a blood pressure lowering effect of saralasin be observed. In the two patients with hypercorticism both renin activity and plasma aldosterone increased during saralasin infusion. The patient with primary aldosteronism only showed a weak increase in plasma aldosterone concentration. These results seem to exclude an important role of the renin angiotensin system in the pathogenesis of hypertension in Cushing's syndrome. The unresponsiveness of elevated blood pressure to saralasin in the two patients with hypercorticism and in the patient with primary aldosteronism indirectly supports the assumption that in patients with Cushing's syndrome increased mineralocorticoid activity may be the main factor in the pathogenesis of hypertension.
    Notes: Zusammenfassung Um die Bedeutung des Renin-Angiotensin Systems in der Pathogenese der Hypertonie bei Cushing-Syndrom zu untersuchen, wurden bei 2 Patienten mit Hyperkortizismus 20 mg Saralasin (1-Sar-8-Ala-Angiotensin II) über einen Zeitraum von 30 min unter ständiger Blutdruckkontrolle infundiert. Zusätzlich diente ein Patient mit primärem Aldosteronismus, einer etablierten Form von Mineralokortikoidhochdruck, als Kontrolle. Weder bei den 2 Patienten mit Cushing-Syndrom noch bei dem Patienten mit primärem Aldosteronismus ließ sich ein blutdrucksenkender Effekt des Saralasins nachweisen. Die beiden Patienten mit Hyperkortizismus zeigten unter Saralasin sowohl einen Anstieg der Renin-Aktivität als auch des Plasmaaldosterons. Bei dem Patienten mit primärem Aldosteronismus ließ sich nur ein geringgradiger Anstieg der Plasmaaldosteronkonzentration nachweisen. Diese Ergebnisse sprechen gegen eine wichtige Rolle des Renin-Angiotensin Systems in der Pathogenese der Hypertonie bei Cushing-Syndrom. Die Unbeeinflußbarkeit des Hochdrucks durch Saralasin bei den beiden Patienten mit Hyperkortizismus und dem Patienten mit primärem Aldosteronismus stützen indirekt die Annahme, daß bei Patienten mit Cushing-Syndrom eine erhöhte Mineralokortikoidaktivität der Hauptfaktor in der Pathogenese der Hypertonie ist.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 276 (1976), S. 161-165 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal9Be+ (I=3/2) ions are polarized by direct optical pumping in He buffer gas. Observation of⩼gDF=± 1 transitions yields for the hyperfine splitting frequencyv hfs(9Be+, 1s 2 2s 2 S 1/2)=1250018(5) kHz. The result is discussed with regard to predictions of recent theoretical calculations and of the Fermi-Segré formula for the ground state hfs of the Li isoelectronic sequence.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Virchows Archiv 53 (1871), S. 168-209 
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 19 (1978), S. 556-563 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary Although a transitory maternal zinc deficiency has been shown to result in an increased cadmium-induced fetotoxicity, the results of the present investigation indicated that a maternal zinc deficiency apparently did not affect the placental transfer of cadmium. However, a zinc deficiency did alter the maternal distribution of cadmium. The increased cadmium fetotoxicity associated with a maternal zinc deficiency may be caused by a maternal alteration rather than a direct effect on the fetus. Further study is necessary prior to any definitive statement concerning the effects of a maternal zinc deficiency on cadmium. fetotoxicity.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 19 (1978), S. 206-214 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Summary This investigation has shown that not only the extent of fetal resorption and malformation but also the types of malformation seen in rats depend upon the strain used and day of gestation. Furthermore, the effects of zinc deficiency and cadmium administration on the fetus can be at least additive, as was seen for malformations. For fetal resorption, zinc deficiency potentiated the action of cadmium.
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  • 6
    ISSN: 1432-1440
    Keywords: Akute β-Rezeptorenblockade ; Hypertension ; Renin ; Aldosteron ; Tag-Nacht-Rhythmus ; Acute β-receptor blockade ; Hypertension ; Renin ; Aldosterone ; Day-night rhythm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The effect of acute (intravenous) β-adrenergic blockade with propranolol or pindolol on arterial pressure (BP), plasma renin activity (PRA), and plasma concentration of aldosterone (PA) was evaluated in 20 essential hypertensive men. BP, PRA and PA were determined during continuous recumbency overnight (8 p.m. to 6 a.m.) every 30 min. Two groups of patients were observed. Patients of group I exhibited a characteristic day-night rhythm of PRA with low values before midnight and large increases early in the morning. Conversely, no rhythm and very low PRA values were observed in patients of group II. BP was higher in group II than in group I. In group I following intravenous propranolol or pindolol, BP fell within minutes and levels as well as rhythms of PRA were converted to those of group II without treatment. In group II day-night profiles of PRA and BP remained unchanged. Rhythm and concentration of PA in the two groups were not influenced by either drug. In 4 patients of group I infusion of angiotensin II inhibitor did not lower BP. The observations suggest that in the two groups dissimilarities in rhythms of PRA as well as in BP responses to β-blockade may reflect differences in neuro-adrenergic tone.
    Notes: Zusammenfassung Der Einfluß einer akuten (intravenösen) β-Rezeptorenblockade mit Propranolol oder Pindololauf den Blutdruck (RR), die Plasma-Reninaktivität (PRA) und die Plasma-Aldosteronkonzentration (PA) wurde bei 20 Männern mit essentieller Hypertension untersucht. RR, PRA und PA wurden am liegenden Patienten nachts (20.00–6.00 Uhr) alle 30 min bestimmt. Zwei Gruppen von Patienten konnten unterschieden werden: Patienten der Gruppe I wiesen einen charakteristischen Tag-Nacht-Rhythmus in der Plasma-Reninaktivität auf, mit niedrigen Werten vor Mitternacht und hohen Werten am frühen Morgen. Im Gegensatz hierzu hatten die Patienten der Gruppe II sehr niedrige PRA-Werte; ein Rhythmus für PRA ließ sich nicht nachweisen. RR war höher in der Gruppe II als in Gruppe I. Nach Infusion von Propranolol oder Pindolol kam es in der Gruppe I zu einem schnellen RR-Abfall. Das Verhalten des Tag-Nacht-Profils für PRA war nach der β-Blockade vergleichbar mit demjenigen der Gruppe II vor der β-Blockade. In der Gruppe II blieben RR und Tag-Nacht-Profil von PRA unter β-Blockade unverändert. Rhythmus und Konzentration von PA wurden in beiden Gruppen nicht beeinflußt. Bei 4 Patienten der Gruppe I führte Angiotensin II-Blockade zu keiner RR-Senkung. Die Ergebnisse sind mit der Annahme vereinbar, daß die Unterschiede im Renin-Rhythmus und im Blutdruckverhalten nach akuter β-Rezeptorenblockade durch eine unterschiedliche neuroadrenerge Aktivität der beiden Gruppen bedingt sind.
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  • 7
    ISSN: 1432-1440
    Keywords: Renovaskuläre Hypertonie ; Renin ; Perkutane transluminale Dilatation ; Isotopennephrogramm ; Renovascular hypertension ; Renin ; Percutaneous transluminal dilatation ; Radionephrogram
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Percutaneous transluminal dilatation of a left sided renal artery stenosis was performed in a 61 year old patient with hypertension. Biochemical and hemodynamic activity of the renal artery stenosis was demonstrated by measurement of renal venous renin-activity and determination of renal plasma flow and of pre- and poststenotic blood pressure values. Shortly after the dilatation procedure hypertension disappeared and renal plasma flow increased. The described procedure might be an alternative method to renal vascular surgery.
    Notes: Zusammenfassung Bei einem 61jährigen Patienten mit renovasculärer Hypertonie bei linksseitiger arteriosklerotischer Nierenarterienstenose wurde eine perkutane transluminale Dilatation der Stenose vorgenommen. Die biochemische und hämodynamische Aktivität der Nierenarterienstenose wurde durch Messung der Plasmareninaktivität im Nierenvenenblut, Bestimmung des renalen Plasmaflusses und der prä- und poststenotischen Blutdruckwerte in der Nierenarterie belegt. Kurz nach der Dilatation der Stenose normalisierte sich der Blutdruck, und es kam zu einem Anstieg des renalen Plasmaflusses. Weitere Untersuchungen werden zeigen, ob die beschriebene Methode eine Alternative zur operativen Korrektur der Nierenarterienstenose bietet.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 56 (1978), S. 229-234 
    ISSN: 1432-1440
    Keywords: Aldosteron ; Renin ; Cortisol ; Diabetes mellitus ; Hypoaldosteronismus ; Hyperkaliämie ; Aldosterone ; Renin ; Cortisol ; Diabetes ; Hypoaldosteronism ; Hyperkalemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In three patients with diabetes and hyporeninemic hypoaldosteronism changes in renin activity, plasma aldosterone and cortisol were examined under various conditions: orthostasis and intravenous furosemide, infusion of synthetic β1–24 ACTH on two consecutive days and diurnal variations in basal hormone fluctuations. Each patient showed unmeasurably low renin activity unresponsive to orthostasis and intravenous furosemide while plasma aldosterone was below normal range. Under ACTH-infusion only marked increases in aldosterone were observed in one patient whereas cortisol responded normally in all diabetics tested. Analysis of diurnal night day fluctuations (20.00–8.00) in plasma aldosterone and cortisol revealed a close and statistically significant relationship between both hormones in each of the three patients (p〈0.05–〈0.001). Variations in plasma aldosterone thus were mediated through changes in endogenous pituitary ACTH. Compared with normal controls however, diurnal aldosterone curves were set at a lower level. Our results demonstrate that a reduced sensitivity of the adrenal gland to ACTH is not responsible for the observed subnormal plasma aldosterone levels in these patients. Therefore, the lack of circulating angiotensin II seems to be the causative reason of hypoaldosteronism. The exact mechanism of undetectable renin activity in these patients remains unknown.
    Notes: Zusammenfassung Bei drei Patienten mit Diabetes mellitus und hyporeninämischem Hypoaldosteronismus wurden Veränderungen der Plasmareninaktivität, des Plasmaaldosteron- und Plasmacortisolspiegels unter folgenden Bedingungen geprüft: Orthostase und intravenöse Furosemidapplikation, Infusion von synthetischem β1–24 ACTH an zwei aufeinanderfolgenden Tagen, Tag-Nacht-Rhythmus der basalen Hormonplasmaspiegel. Alle Patienten zeigten eine nicht meßbare und durch Orthostase und Furosemid nicht stimulierbare Reninaktivität. Gleichzeitig wurden subnormale Aldosteronplasmakonzentrationen gemessen. Unter ACTH-Infusion zeigte nur ein Patient einen deutlichen Anstieg des Plasmaaldosterons, während das Plasmacortisol in allen drei Fällen normal stimulierbar war. Die statistische Analyse der Tag-Nacht-Schwankungen von Plasmaaldosteron und Plasmacortisol zeigte in jedem der Fälle eine enge und statistisch signifikante Beziehung zwischen beiden Hormonen (p〈0,05–〈0,001). Es ist somit anzunehmen, daß Schwankungen des Plasmaaldosterons durch Veränderungen der hypophysären ACTH-Ausschüttung verursacht wurden. Jedoch war im Vergleich zu Normalpersonen die Rhythmik des basalen Plasmaaldosterons auf einem tieferen Niveau eingestellt. Unsere Ergebnisse lassen den Schluß zu, daß bei diesen Patienten nicht eine verminderte Sensitivität der Nebennierenrinde auf ACTH für die beobachteten subnormalen Aldosteronspiegel verantwortlich ist. Ursache für den Hypoaldosteronismus scheint somit der Mangel an zirkulierendem Angiotensin II zu sein. Der genaue Mechanismus der nicht meßbaren Reninaktivität bei diesem Patienten bleibt unbekannt.
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  • 9
    ISSN: 1573-5117
    Keywords: Manganese-54 ; concentration factor ; algae ; Daphnia ; minnows
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Concentration factors (CF) of 54Mn for three aquatic species: green algae (Protococcoidal chlorella), Daphnia magna, and fathead minnows (Pimephales promelas) were determined following direct exposure to the isotope in solution. The maximum accumulation (CF = 911) in P. chlorella was reached at 48 hours of exposure; the maximum uptake (CF = 65) in Daphnia was reached at 8 hours of exposure; and the maximum accumulation (CF = 22.6) in fathead minnows was at 128 hours of exposure. The data indicate that 54Mn accumulation decreases with ascent up a theoretical aquatic food chain when water is the only source of contamination.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Parasitology research 58 (1978), S. 91-96 
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Applying the indirect fluorescent antibody technique to the infective stages of the hookwormAncylostoma caninum, it appeared that they do not show IgG antibody binding when serum from dogs infected withA. caninum was used in the test (antiserum). However, inhibiting these stages metabolically with azide or with low temperatures, IgG antibody binding to the outer surface was observed. When the inhibitory factors were removed, shedding of fluorescent substances was seen, which were obviously coming from the outer surface of the larvae. This suggests that shedding of the antigen might occur.
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