Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Powders  (2)
  • Automatical prescreening  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 229 (1980), S. 219-227 
    ISSN: 1432-0711
    Keywords: Automatische Krebsvorsorge ; DNS ; Lysin ; Automatical prescreening ; DNA ; Lysine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary An automated initial screening of cervical smears would be of great benefit as much time would be saved by removing the need to rely on cytologists for the diagnosis of negative smears. The computerized evaluation of DNA histograms obtained by impulse cytophotometry shows promise but the additional determination of the amount of lysine in the nucleus would seem to be of value. Three mathematical methods for the evaluation of histograms are presented and compared. It is shown that measurements of nuclear DNA as well as lysine improve the diagnostic accuracy of automated screening processes.
    Notes: Zusammenfassung Die zunehmende Beteiligung der Bevölkerung an der gynäkologischen Krebsvorsorge und die damit verbundene Erfassung maligner Erkrankungen führt zu vergleichsweise sinkenden Anzahlen suspekter zytologischer Befunde. Bestrebungen, sicher negative Befunde durch eine weitgehend automatisierte Vorauswahl auszusortieren, sind daher verständlich. Als Methode der Wahl gilt derzeit die computergesteuerte Berechnung impulszytophotometrischer DNA-Histogramme. In den vorliegenden Untersuchungen wird die zusätzliche Bestimmung des Lysinanteils im Zellkern als Parameter fur den Heterochromatinanteil vorgeschlagen. Es werden drei rechnerische Methoden zur Auswertung der Histogramme vorgestellt, die untereinander verglichen werden. Hierbei zeigt sich, daß die Bestimmung von DNA und Lysin der einfachen Bestimmung der DNA hinsichtlich der Differentialdiagnose überlegen ist.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pharmacy world & science 15 (1993), S. 105-115 
    ISSN: 1573-739X
    Keywords: Calcium phosphates ; Drug compounding ; Excipients ; Particle size ; Physics ; Powders ; Tablets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ten commercially available calcium phosphates used for direct tableting were evaluated. The particle size distributions, powder properties, Sorption isotherms and pH values of aqueous slurries were compared. All samples showed good or at least sufficient flowability. Scanning electron micrographs illustrated the different kinds of manufacturing and gave hints on their expectable behaviour under compaction pressure. The sorption isotherms of identical chemical substances, which had been manufactured by different methods, differed strongly. This can be related to their specific surface areas. Most of the hydroxylapatites have large surface areas and can absorb up to more than 15% water at 93% relative humidity. Dibasic calcium phosphate dihydrate was non-hygroscopic and absorbed less than 1% water. With the exception of monobasic calcium phosphate monohydrate all calcium phosphates behaved quite neutral in water. Monobasic calcium phosphate monohydrate can be regarded as a solid acid. Although the calcium phosphates are usually stable substances, the role of crystal water in the case of dibasic calcium phosphate dihydrate and monobasic calcium phosphate monohydrate is problematic due to possible interactions with active ingredients.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pharmacy world & science 15 (1993), S. 116-122 
    ISSN: 1573-739X
    Keywords: Calcium phosphates ; Drug compounding ; Ejection force ; Excipients ; Friability ; Hecket plots ; Lubrication ; Particle size ; Powders ; Tablets ; Tensile strength
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstracts Ten calcium phosphates suitable for direct compression (dibasic calcium phosphate dihydrate, dibasic calcium phosphate anhydrous and hydroxylapatite) were investigated with respect to their compressional behaviour. Except for Di-Cafos A all products gave tablets with sufficient to good mechanical strength. Nevertheless, there were differences between the products. All tablets prepared from the different products showed a high friability. This seems to be a problem of the calcium phosphates in general. On the other hand, the influence of magnesium stearate on the mechanical strength of the tablets was negligible for all products investigated. Moreover, a considerable effect of the particle size on the tensile strength of the tablets was found. The ejection forces and residual pressures were high in general, but critical only in the case of hydroxylapatites. Heckel plots were used to differentiate between plastic deformation and brittle fracture of the particles. In the case of calcium phosphates the slope of the Heckel plots indicated the hardness of the particles rather than their deformation behaviour.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...