ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Comparison of selection procedures for the formation of homogeneous groups in clinical tests of dental care agents (1985)

BILL, E. ; KLUEPPEL, H.-J.

Oxford, UK : Blackwell Publishing Ltd

International journal of cosmetic science 7 (1985), S. 0

add to mindlist on the mindlist

Details

ISSN: 1468-2494

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Dental trials of new dental care formulations are studied with regard to specific quality characteristics such as inhibition of plaque formation and reduction of gingival bleeding, and require homogeneous panels of test persons in which both systematic and random sources of experimental error are excluded. The homogeneous panels must be formed from an available pool of test persons (global panel) so that each panel as a subset presents the same dental features on average and can be compared statistically one with another. This is a necessary condition for a valid scientific conclusion to be obtained from comparative dental studies. This type of homogeneous group division of a global panel can clearly be based on other medical features.Four selection procedures for the formation of homogeneous panels from the global panel were compared quantitatively with regard to their efficiency and homogeneity of group division, namely:— randomization method;— block target method;— median pair method;— block median pair method.With the exception of the randomization method, which can be applied more generally, the other selection methods require a preliminary study of the available test persons with regard to their medical features.A comparison of the four selection procedures shows that the three other methods are more likely to provide more homogeneous panels than the randomization method.Comparaison des procedures de selection concernant la formation de groupes homogènes dans les tests cliniques des agents de soins dentaires

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1467-2494.1985.tb00421.x

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Zur Kenntnis der Erdalkalimetall- und Bleihalogenat-Monohydrate. Röntgenographische, thermoanalytische und IR-spektroskopische Untersuchungen (1976)

Lutz, H. D. ; Klüppel, H.-J. ; Kesterke, H.-J.

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 423 (1976), S. 83-90

add to mindlist on the mindlist

Details

ISSN: 0044-2313

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: Alkaline Earth Metal and Lead Halogenate Monohydrates. Thermal Analysis, X-Ray and IR-spectroscopic DataExcepting Ca(BrO3)2 · H2O and Sr(JO3)2 · H2O the chlorate, bromate, and iodate monohydrates of calcium, strontium, barium, and lead crystallize in the monoclinic space group C2/c. Data see „Inhaltsübersicht“.According to DTA-measurements the dehydration of the monohydrates takes place between 93°C (Sr(BrO3)2 · H2O) and 192°C (Ba(CIO3)2 · H2O) in two steps mostly. On further heating the halogenates are decomposed, the iodates to the periodates, the chlorates to the chlorides forming perchlorates as intermediate compounds (high temperature i.r.-spectra), the bromates to the bromides, and the lead compounds under bursting to the oxides. Before decomposition the melting point of anhydrous Ba(ClO3)2 and Ba(BrO3)2 can be observed (408 and 273°C).

Notes: Die Chlorat-, Bromat- und Jodat-Monohydrate des Calciums, Strontiums, Bariums und Bleis kristallisieren mit Ausnahme des Ca(BrO3)2 · H2O in der monoklinen Raumgruppe C2/c: .Nach DTA-Messungen wird das Kristallwasser der Monohydrate zwischen 93°C (Sr(BrO3)2 · H2O) und 192°C (Ba(ClO3)2 · H2O) meist in zwei Schritten abgegeben. Bei weiterem Erhitzen werden (nach Hochtemperatur-IR-Messungen) die Jodate zu Perjodaten, die Chlorate über die Zwischenstufe der Perchlorate zu Chloriden, die Bromate zu Bromiden und die Bleiverbindungen explosionsartig zu Oxiden zersetzt. Beim Ba(CIO3)2 · H2O und Ba(BrO3)2 · H2O kann vor der Zersetzung der Schmelzpunkt der wasserfreien Verbindungen (408 und 273°C) beobachtet werden.

Additional Material: 2 Ill.