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  • 1
    Digitale Medien
    Digitale Medien
    Hormonstatus bei Frauen nach Hysterektomie im Vergleich zu Kontrollen (1978)
    Springer
    Archives of gynecology and obstetrics 226 (1978), S. 363-368 
    Details
    ISSN: 1432-0711
    Schlagwort(e): Hysterectomy ; Ovarian function ; Premenopause ; Hormonal cycle ; Hysterektomie ; Ovarialfunktion ; Pramenopause ; Zyklus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Bei 48 Frauen nach Hysterektomie im Alter von 28–43 Jahren wurden 5–10 Jahre später Plasmabestimmungen von FSH, LH, Östradiol-17β und Progesteron durchgeführt. Zum Vergleich diente eine Gruppe prämenopausaler Frauen mit fluktuierender FSH-Erhöhung und eine weitere mit stabilem Hypergonadotropismus. Es wurde festgestellt, daß nach Hysterektomie bei den Frauen unter 40 Jahren stets, zwischen 41 und 45 Jahren in drei Viertel und mit mehr als 46 Jahren in der Hälfte eine normogonadotrope und normosteroidale Ovarialfunktion vorlag. Die Frauen mit fluktuierendem oder stabilem Hypergonadotropismus waren jedoch nach Hysterektomie durchschnittlich um 2 Jahre jünger als die prämenopausalen Frauen mit entsprechender Ovarialfunktion. Eine gewisse zeitliche Vorverlegung von nachweisbaren Kriterien einer definitiven Ovarialinsuffizienz war bei einem Teil der Frauen damit nicht auszuschließen.
    Notizen: Summary Plasma-FSH, -LH, -Estradiol-17β, and -Progesterone were determined weekly in women aged between 28 and 43 years who had been hysterectomized 5–10 years before. The endocrine parameters were compared with those of women with a normal cycle and two groups of premenopausal women, the one showing a fixed hypergonadotropic state, the other slightly elevated but still cyclic fluctuations of FSH and normal LH values. After hysterectomy, normal ovulatory cycles were found in all women of up to 40 years, in 75% of those between 41 and 45 years and in 50% of those beyond 46 years. The average age of women with fluctuating or fixed hypergonadotropism was 2 years less in the hysterectomiced group. Thus, a certain acceleration of ovarian insufficiency caused by hysterectomy cannot be denied.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02119227
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  • 2
    Digitale Medien
    Digitale Medien
    Hormone levels in women after hysterectomy (1989)
    Springer
    Archives of gynecology and obstetrics 244 (1989), S. 169-173 
    Details
    ISSN: 1432-0711
    Schlagwort(e): Hysterectomy ; Hypergonadotropism
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The serum levels of FSH, LH and estradiol-17β (E2) were determined in 110 women aged between 38–48 years who had been hysterectomized 2–10 years previously and were compared with a control group (n=112). In hysterectomized women both FSH and LH levels were higher than in controls during the whole 12 year period. These differences were significant up to 43 years of age. The hypergonadotropism in hysterectomized women correlates with the higher incidence of climacteric symptoms reported in the literature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00931295
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  • 3
    Digitale Medien
    Digitale Medien
    Polarity change in capillary GC by serial-column temperature optimization (SECAT mode in capillary GC) (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 416-422 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary, glass ; SECAT-technique=stepless fine tuning of capillary selectivity by serial column temperature optimization ; Exponential influence of temperature on selectivity over a wide range found ; SECAT-technique ready for automation of column adjustment on sample composition polarity ; Instrumental and methodological details for primitive self made solution given ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: GC, including capillary GC, is rather inflexible, if a certain column length and stationary phase has been fixed for a given analytical problem. If the sample composition changes, one often has to change the column length and/or stationary phase, at least when something like optimum analytical conditions are needed. Temperature changes (or heating rates) can change the selectivity of a given column only within very limited ranges, due to the exponential effect of temperature on retention time. By serial coupling two chemically different capillaries, each run at another temperature, even the slightest changes of these two temperature values have a dramatic effect on the selectivity of the system for polar substances. We call this technique the SECAT mode of GC. Results are reported as retention index shifts, dependent on SECAT temperature data. This technique can in future easily be automated, thus enabling the analyst, for polar sample analysis, to adjust a given chroma-tographic system to his specific sample composition without touching the instrument.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240020709
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  • 4
    Digitale Medien
    Digitale Medien
    A simple high temperature, high pressure safe T-piece for installing micro packed glass columns as well as macrobore capillaries in a GC instrument (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 595-595 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Connection device ; Micro packed columns ; Macrobore capillaries ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240091012
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  • 5
    Digitale Medien
    Digitale Medien
    Dramatic selectivity changes on carrier gas flow change in a series-coupled GC capillary tandem (1985)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 8 (1985), S. 580-584 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns, in series ; Flow rate changes ; Selectivity ; Retention time ; Residence time ; Multichromatography ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We describe the polarity of selectivity of a GC separation system in terms of Retention Index data. In a series-coupled capillary system having stationary phases of differing polarity even slight (independent!) carrier gas flow changes in one part of the capillary series result in a dramatic change of selectivity. “Dramatic” is a relative term! Using a simple electronically controlled flow changing device we found retention index changes of several hundred units for polar test compounds such as phenols on a SE30/Carbowax tandem. This means: The classical theoretical model for understanding retention (and selectivity) in chromatography must be corrected. We propose a very simple approach involving addition of the expression RESIDENCE TIME to the chromatographic vocabulary. Instead of using flow resistors, one can just add a pressure regulator to the coupling point. A powerful analytical concept is now in easy reach.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240080921
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  • 6
    Digitale Medien
    Digitale Medien
    Native ethylene glycol in wine: Application of a dead volume free, very fast “deans heart-cut” system on-line with multi-chromatography (1987)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 240-243 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Gas chromatography ; Capillary columns, coupled ; Heart cutting ; Multi-chromatography ; Wine analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Data about the existence of native HO—CH2—CH2—OH (MEG) in natural wines and champagne has led to delicate questions because of legal decisions already made to declare wine or champagne illegal for sale if the MEG concentrations found are above 10 mg/liter. Action has been taken because of the DEG (diethylene glycol) disaster in European wines of 1985…86. An incorrect legal decision was made due to the belief that MEG cannot be produced biochemically by grape vines. A further reason may be lack of correct data on native MEG trace concentrations, as a result of the special behavior of this diol. As first member of a homologous series whose higher members (C4) are normally found in all wines at quite high concentration levels, MEG shows extremely adsorptive behavior. The solution of the chromatographic problems is summarized in this paper. MEG concentrations in Riesling as example are in the range of 2 to 6 mg/liter and can easily be increased by biotechnological steps to a level of around 10 to 60 mg/liter. This is again due to the specific adsorptive behavior of MEG, which can be enriched on filter surfaces and displaced when the wine acidity changes with changing types. In order to control and guarantee the qualitative and quantitative results of MEG analyses we used a combination of Deans heart cutting on-line with Multi-Chromatography. It was easy to produce false data by many otherwise useful single column or two-dimensional separation processes, etc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240100506
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