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  • Articles  (23)
  • Chromatographie, Dünnschicht  (18)
  • hypertension
  • Springer  (23)
  • Cambridge University Press
  • Frontiers Media
  • 2020-2022
  • 1990-1994
  • 1980-1984
  • 1975-1979  (23)
  • 1970-1974
  • 1975  (23)
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  • Articles  (23)
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  • Springer  (23)
  • Cambridge University Press
  • Frontiers Media
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  • 2020-2022
  • 1990-1994
  • 1980-1984
  • 1975-1979  (23)
  • 1970-1974
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  • 1
    ISSN: 1432-1041
    Keywords: α-methyldopa ; plasma concentration ; hypertension ; sulphate conjugation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The plasma concentrations of free α-methyldopa and methyldopa sulphate conjugate were measured in 7 hypertensive patients with normal renal function following α-methyldopa (1 g) orally. Five of these patients subsequently received α-methyldopa ethyl ester (250 mg) (methyldopate) intravenously and two further patients received 250 mg of α-methyldopa intravenously. After oral administration a large amount of total plasma α-methyldopa was present as sulphate conjugate. There were wide interindividual differences in the ratio of free: conjugated α-methyldopa in plasma (ratio at 4 hours ranged from 3.73 – 0.83) suggesting that individual differences in the extent of sulphate conjugation may occur. There was no close correlation between the degree of conjugation and the fall in arterial pressure. At all time intervals examined, plasma concentrations were higher following intravenous α-methyldopa than α-methyldopate. The plasma concentration of α-methyldopa (free and esterified) 60 minutes after i.v. α-methyldopate was 1.7±0.3 µg/ml wile at the same time after the same dose of methyldopa by the same route the mean concentration was 5.9 µg/ml. Although small amounts of sulphate conjugate were detected after i.v. α-methyldopate, insignificant quantities of conjugate were found after i.v. α-methyldopa. The average fall in mean arterial pressure was 27 mm Hg following i.v. α-methyldopa but only 2.7 mm Hg following α-methyldopate. These results suggest that sulphate conjugation of α-methyldopa occurs in the gastrointestinal tract during absorption. Hydrolysis of α-methyldopa ethyl ester does not appear to be instantaneous and pharmacokinetic differences between the ester and free α-methyldopa have been demonstrated.
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  • 2
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    European journal of clinical pharmacology 8 (1975), S. 387-392 
    ISSN: 1432-1041
    Keywords: Left ventricular pressure ; left ventricular contractility ; hypertension ; diazoxide ; beta-adrenergic blockade ; isometric exercise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effect of diazoxide on left ventricular performance during rest and isometric exercise (handgrip) was examined in 16 unselected hypertensive patients, 6 of whom had been pretreated with the beta-adrenergic blocking agent pindolol. Diazoxide regularly and promptly produced a fall in left ventricular systolic and end diastolic pressures, and an increase in heart rate and left ventricular dp/dtmax. Haemodynamic changes were maximal 2 minutes after injection of the drug and decreased little over the next 8 minutes. After beta-adrenergic blockade, diazoxide caused a more pronounced reduction in left ventricular systolic pressure and a less marked fall in end-diastolic pressure, whilst the diazoxide-induced rise in heart rate was partially and the increase of dp/dtmax was completely inhibited. The increase in systolic pressure during isometric exercise was not influenced by diazoxide, but the positive inotropic reaction was augmented. The findings appear to show that cardiac stimulation by diazoxide is due to a reflex mechanism transmitted by baroreceptors, and that improvement of cardiac performance is mainly due to a reduction of left ventricular after-load.
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  • 3
    ISSN: 1432-1041
    Keywords: Beta-blockade ; penbutolol ; hypertension ; plasma and urinary catecholamines ; plasma renin ; aldosterone excretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects of penbutolol (Hoe 893 d), a new non-selective beta-receptor blocking agent, were studied in 5 patients with moderate hypertension. Initially, it was shown that 2–4 mg given orally once or twice daily tended to lower blood pressure and pulse rate, both at rest and following submaximal work. In prolonged trials (3–8 months) 40–60 mg/day were required to produce an acceptable antihypertensive effect. Penbutolol had no effect on the normal increase in plasma noradrenaline and adrenaline on standing, nor did it alter basal urinary catecholamine excretion. Submaximal work caused no significant change in plasma catecholamines before treatment, but there was a marked rise both in plasma noradrenaline and adrenaline during treatment with penbutolol. In short term studies there was a fall in plasma renin by 4 hours after oral administration of penbutolol 2–4 mg, which persisted for 24 hours. Prolonged treatment with penbutolol 20–30 mg twice daily inhibited renin production under basal conditions and following submaximal work, as well as lowered basal urinary aldosterone excretion. In one patient slight asthmatic symptoms appeared after treatment for 3 months with penbutolol. In other respects penbutolol was well tolerated.
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  • 4
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    European journal of clinical pharmacology 8 (1975), S. 21-31 
    ISSN: 1432-1041
    Keywords: Multicentre controlled trial ; hypertension ; oxprenolol ; hydrochlorothiazide dihydralazine ; side effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In a multicentre, double-blind, between-patient study the hypotensive effect of oxprenolol was investigated in 329 patients with mild to moderate hypertension. A factorial experimental design with three factors was chosen: oxprenolol — none or daily doses of 20, 40, 60 and 80 mg; dihydralazine and hydrochlorothiazide, respectively, none or 30 mg daily. Each treatment was given for 4 weeks after an adequate period of withdrawal from any other possible hypotensive therapy and one week of placebo wash-out. Irrespective of the association with dihydralazine and/or hydrochlorothiazide, oxprenolol had a hypotensive effect linearly related to dose for standing systolic (P〈0.05) and diastolic (P〈0.01) pressure, and for lying diastolic (P〈0.05) pressure. The addition of dihydralazine enhanced the time-course of the hypotensive effect of oxprenolol, particularly the 80 mg dose level. In general, the combination of oxprenolol with dihydralazine and hydrochlorothiazide caused larger reductions in blood pressure, particularly with oxprenolol 80 mg. In the latter group, the eventual falls in blood pressure were 30.5 and 14.4 mmHg for lying systolic and diastolic, respectively; and 32.1 and 20.0 mmHg for the standing systolic and diastolic pressures. The drug was well tolerated; major side effects (heart failure and bronchospasm) occurred in three patients.
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  • 5
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 205-207 
    ISSN: 1618-2650
    Keywords: Trenn. von Methylolaminen, Melaminharzen ; Chromatographie, Dünnschicht ; Celluloseschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Identifizierung der Komponenten in einem Methylolmelamin-Gemisch mittels Dünnschicht-Chromatographie wurde möglich, nachdem die einzelnen Methylolmelamine (Mono-, Di-, Tri-, Tetra-, Penta- und Hexamethylolmelamin) rein dargestellt werden konnten. Aus der zweidimensionalen dünnschichtchromatographischen Entwicklung des Methylolmelamin-Gemisches folgt, daß während der Dauer der Entwicklung keine Änderung der Zusammensetzung des Methylolmelamin-Gemisches stattfindet. Die Chromatographie wurde auf Celluloseschichten mit Butanol/Äthanol/Wasser (4∶1∶2) als Fließmittel und ammoniakalkalischer Silbernitratlösung als Nachweisreagens durchgeführt.
    Notes: Abstract Identification of the components in a methylolmelamine mixture by thin-layer chromatography was facilitated after obtaining each of the individual methylolmelamines (mono-, di-, tri-, tetra-, penta- and hexamethylolmelamine). By the use of two-dimensional thin-layer chromatography it was noted that no change in the composition of the mixture takes place during the time of Chromatographic development. Separation was achieved on cellulose layers using butanol/ethanol/water (4∶1∶2) as solvent and ammonia-alkaline AgNO3 solution as detection reagent.
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  • 6
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    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 105-110 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; Auswertung über die Kubelka-Munk-Funktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine quantitative Auswertung von Dünnschicht-Chromatogrammen über die Kubelka-Munk-Funktion wird beschrieben. Die mathematische Ableitung erfolgt über zwei Ansätze: Differentialgleichung und hyperbolisch-trigonometrische Funktionen. Es zeigt sich, daß beim Zweiwellenlängen-Densitometer die Bestimmung absoluter Remissionswerte entfällt, und das erhaltene Meßsignal mit geringem Aufwand linearisiert werden kann. Die Auswertung erfolgt über die Peakhöhe, ermittelt durch Zig-Zag-Scantechnik (Shimadzu CS 900). Meß- und Vergleichswellenlänge sollen dicht beieinander liegen, um ähnliche Streukoeffizienten zu erhalten. Vermessen wird Coffein im Bereich von 0,25–20 μg, in dem die Linearisierung noch einwandfrei arbeitet. Der Fehler liegt als relative Standardabweichung bei 1,9% (c=4–20μg,n=15) bzw. 2,7% (c=0,25–2 μg,n=22).
    Notes: Abstract The mathematical derivation is given by two different statements: differential equation and hyperbolic-trigonometric functions. It is shown that measurement of absolute values of remission is inapplicable. The signal is easily to be linearized. The evaluation is given by the maximum peak value obtained by the zig-zag scan technique (Shimadzu CS 900). To get similar scatter values sample and reference wave-length should be tuned as close as possible. Caffeine is measured from 0.25 to 20 μg. In this range the linearizer works unobjectionably and the error as relative standard deviation is in the order of 1.9% (4–20 μg,n=15) and 2.7% (0.25–2 μg,n=22), respectively.
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  • 7
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    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 126-126 
    ISSN: 1618-2650
    Keywords: Trenn. von Anorgan. Ionen als Xanthate ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 8
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    Fresenius' Zeitschrift für analytische Chemie 277 (1975), S. 208-208 
    ISSN: 1618-2650
    Keywords: Nachw. von Diphenylpyralin im Urin ; Chromatographie, Dünnschicht ; UV-Bestimmung, N-Oxid und Desmethylderivat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 9
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    Bulletin of experimental biology and medicine 80 (1975), S. 1412-1414 
    ISSN: 1573-8221
    Keywords: cerebral blood flow ; hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The systemic arterial pressure was raised in normal rabbits and in rabbits with experimental renal hypertension by intravenous injection of noradrenalin and the local cerebral blood flow was recorded at two points of the cortex or white matter of the cerebral hemispheres by the hydrogen-clearance method, and the EEG also was recorded. A series of successive changes in the local cerebral blood flow was observed and these changes could be similar or different in duration and character at different electrodes. Pathological forms of activity were revealed on the EEG.
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  • 10
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    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 7-9 
    ISSN: 1618-2650
    Keywords: Best. von Coffein, Phenacetin ; Chromatographie, Dünnschicht ; Spektralphotometrie ; Kopplung mit Tischrechner
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Am Beispiel der Bestimmung von Phenacetin und Coffein im pharmazeutisch verwendeten Mengenverhältnis wird die quantitative in situ-Auswertung eines Zweikomponentensystems im on line-Betrieb: Densitometer—Integrator—Tischrechner beschrieben. Die Eichgerade wird für beide Substanzen auf jeder Platte gesondert bestimmt. Durch eine Einschränkung des Konzentrationsbereichs auf obere und untere Toleranzgrenze ergeben sich Vereinfachungen der Ausgleichsrechnungen. Die erzielten Genauigkeiten liegen bei 2 Analysen pro Platte bei 1,51% (Phenacetin) und 2,56% (Coffein) bzw. bei 4 Analysen pro Platte bei 1,50% (Phenacetin) und 2,64% (Coffein) (rel. gen. Standardabweichung, n=18 bzw. n=36).
    Notes: Abstract A TLC method for the determination of phenacetin and caffeine in pharmaceutical preparations using a densitometer in line with an integrator and electronic desk calculator is described. The calibration curves of each compound were prepared where the higher and lower tolerance concentration levels were defined. The accuracy of the method is 1.51% (phenacetin) and 2.56% (caffeine) for two experiments carried out on each plate; 1.50% (phenacetin) and 2.64% (caffeine) for four experiments for each plate (relative standard deviation, n=18 and n=36, respectively).
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  • 11
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    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 127-128 
    ISSN: 1618-2650
    Keywords: Best. von Triterpenen in Pflanzen ; Chromatographie, Dünnschicht ; densitometrisch, pentacyclische Verb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 12
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 30-30 
    ISSN: 1618-2650
    Keywords: Aufklärung von Morphinabbauprodukten ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 13
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 265-269 
    ISSN: 1618-2650
    Keywords: Chromatographie, Dünnschicht ; automatisches Auftragegerät, strich- und kreisförmige Flecke
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurde ein Gerät zur automatischen Auftragung von kreisoder strichförmigen Flecken auf Dünnschicht-Platten entwickelt. 8 oder mehr gleiche Volumina verschiedener Konzentration werden in vorzuwählender Zeit auf die Schicht gebracht. Dadurch erhält man reproduzierbare Flecke, die nach dem Chromatographieren direkt auf der Schicht in Remission oder Transmission gemessen werden. Konzentrationen von Komponenten in Gemischen lassen sich mit einem relativen Fehler von 2–3,5% bestimmen. Der Zeitaufwand beträgt 5–10 min.
    Notes: Abstract An automatic device for the application of spots or bands on TLC plates has been constructed. 8 or more equal volumes of different concentrations are applied to the TLC plate in preselected time. Reproducible spots or bands are obtained, which are measured by remission or transmission directly on the plate after chromatography. Concentrations of components in mixtures can be evaluated with a relative error of 2–3.5%. The time required is 5–10 min.
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  • 14
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 257-264 
    ISSN: 1618-2650
    Keywords: Katalytische Dehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren ; Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Dehydrierung, Ultramikrobereich ; Analyse von Sesquiterpenderivaten, Terpenoiden, Steroiden ; Chromatographie, Dünnschicht ; katalyt ; Dehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die direkte Kopplung einer katalytischen Dehydrierung mit der Dünnschicht-Chromatographie wird beschrieben. Die Reaktion erfolgt nach dem Prinzip der Gasphasendehydrierung durch schubweises Einspritzen der Lösung der zu dehydrierenden Verbindung in die z. B. mit Palladium-Bariumsulfat-Katalysator versehene TAS-Patrone. Die Einwaagen liegen im Bereich von 20–100 μg und die Reaktionstemperaturen je nach Verbindung zwischen 200 und 400°C. Die Reaktionsprodukte werden durch die Lösungsmitteldämpfe zur Schicht transferiert. Anschließend wird chromatographiert und die Reaktionsprodukte identifiziert. Als Anwendungsbeispiele werden Sesquiterpenkohlenwasserstoffe und -alkohole, Sesquiterpenoide des Eudesmantyps, Abietinsäure und Steroide dehydriert.
    Notes: Abstract Direct coupling of a catalytic dehydrogenation to TLC is described. The reaction takes place according to the principle of gas phase dehydrogenation by injecting the solution of the compound to be dehydrogenized in batches into the TAS-cartridge, loaded with e.g. palladium-barium sulphate catalyst. Sample size are in the range of 20–100 μg and the reaction temperatures, depending on the compound, is between 200 and 400°C. The reaction products are carried by the solvent vapours to the thin-layer and subsequently chromatographed and identified. In given examples the dehydrogenation is applied to sesquiterpene hydrocarbons and alcohols, sesquiterpenoids of the eudesman type, abietic acid and steroids.
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  • 15
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 300-300 
    ISSN: 1618-2650
    Keywords: Best. von Nicotin, Cotinin, Nicotin-N-oxid in Harn ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 16
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    Fresenius' Zeitschrift für analytische Chemie 274 (1975), S. 381-381 
    ISSN: 1618-2650
    Keywords: Nachw. von Wasserstoffperoxid ; Chromatographie, Dünnschicht ; Fertigfolien
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 17
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 28-28 
    ISSN: 1618-2650
    Keywords: Nachw. von Organ. Verbindungen, stickstoffhaltig ; Chromatographie, Dünnschicht ; Chlorierungsreaktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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  • 18
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 29-29 
    ISSN: 1618-2650
    Keywords: Trenn. von Phenolen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
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  • 19
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 30-30 
    ISSN: 1618-2650
    Keywords: Best. von Sterigmatocystin ; Chromatographie, Dünnschicht ; Grauskala
    Source: Springer Online Journal Archives 1860-2000
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  • 20
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 201-202 
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schicht aus basischem Zinkcarbonat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Dünnschichten von basischem Zinkcarbonat eignen sich zur Trennung und multiplen Identifizierung von Herbiciden und Insecticiden aus den Wirkstoffgruppen der Carbamate und Phenylharnstoffderivate. Fünf Wirkstoffe, die für die Praxis große Bedeutung haben, konnten mit Hilfe der eindimensionalen Dünnschicht-Chromatographie getrennt werden. Die beste Trennung erhielten wir mit folgenden Laufmitteln: a) Benzol, b) einer Mischung aus Benzol/Petroläther/Chloroform (6∶1∶1). Die Substanzen sind entweder im kurzwelligen UV-Licht bei Indicatorzusatz, oder nach dem Sprühen mit einer 0,1 N AgNO3-Lösung in 3 N HNO3 und anschließender UV(254)-Bestrahlung zu erkennen.
    Notes: Abstract Thin layers of basic zinc carbonate can be used with good results for separation and multiple identification of carbamate and phenylurea pesticides. Five important substances could be separated by one-dimension TLC. The best results were obtained by the following developing solvents: a) benzene, b) a mixture of benzene/petroleum ether/chloroform (6∶1∶1). The substances are either recognisable in short-wave UV-light, when a fluorescence indicator (F 254 nm) is added, or in day-light, after spraying a solution of 0.1 N AgNO3 in 3 N HNO3, followed by an UV-exposure for about 4 min.
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  • 21
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    Fresenius' Zeitschrift für analytische Chemie 275 (1975), S. 206-206 
    ISSN: 1618-2650
    Keywords: Best. von Blei, Cadmium, Quecksilber, Zink ; Chromatographie, Dünnschicht
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  • 22
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 301-302 
    ISSN: 1618-2650
    Keywords: Trenn. von Pesticiden, Carbamaten, Phenylharnstoffen ; Chromatographie, Dünnschicht ; Schichten aus verschiedenen Polyamid-Chargen
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    Topics: Chemistry and Pharmacology
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  • 23
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    Fresenius' Zeitschrift für analytische Chemie 276 (1975), S. 382-382 
    ISSN: 1618-2650
    Keywords: Trenn. von Aminen ; Chromatographie, Dünnschicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
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