𝔖 Bobbio Scriptorium
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No comparison: Distance education finds a new use for ‘No significant difference’

✍ Scribed by Barbara B. Lockee; John K. Burton; Lawrence H. Cross

Book ID
105530633
Publisher
Springer US
Year
1999
Tongue
English
Weight
1014 KB
Volume
47
Category
Article
ISSN
1042-1629

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Saliva and serum samples were collected
Saliva and serum samples were collected from eight healthy volunteers every two hours during a 26-hour period. Melatonin concentrations were measured by radioimmunoassay after chloroform extraction using radioiodinated melatonin as a tracer. Five of the subjects had high serum melatonin levels at night (peak levels higher than 75 pg/ml); in three subjects the highest serum melatonin concentration was 20-40 pg/ml. All subjects had low levels (P <0.001, was obtained for all detectable value pairs (n= 73). The regression and correlation coefficients were almost equal for the peak values of melatonin and during the rising and descending phases of the secretion patterns. However, no significant correlation was found between low daytime salivary and serum concentrations when calculated separately. In the five high-secretors the melatonin levels in saliva reflected reliably the changes in serum, but in the three low-secretors the correlation between salivary and serum melatonin was not significant. The proportion of melatonin found in saliva decreased with increasing serum melatonin levels. Circadian rhythm parameters were estimated by single cosinor analysis. The acrophases did not differ significantly within a subject in the concomitant measurements of serum and salivary melatonin. The measurements of salivary melatonin levels seem valid for studies on melatonin rhythms, but the melatonin concentrations measured in saliva do not always consistently reflect the absolute concentrations in blood.
✍ Maija-Liisa Laakso; Tarja Porkka-Heiskanen; Aino Alila; Dag Stenberg; Gunnar Joh 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 622 KB
The Surprising Vulnerability of New Zeal
The Surprising Vulnerability of New Zealand Manufacturing to CO2 Emissions Pricing: The Lessons of an International Comparison11Disclaimer: The opinions, findings, recommendations and conclusions expressed in this report are those of the authors. Statistics New Zealand (NZ) and the Ministry of Economic Development, NZ take no responsibility for any omissions or errors in the information contained here. Access to the data used in this study was provided by Statistics NZ in accordance with security and confidentiality provisions of the Statistics Act 1975. Only people authorised by the Statistics Act 1975 are allowed to see data about a particular, business or organisation. The results in this paper have been confidentialised to protect individual businesses from identification. Any discussion of data limitations is not related to the data‘s ability to support these government agencies’ core operational requirements. Any table or other material in this report may be reproduced and published without further licence, provided that it does not purport to be published under government authority and that acknowledgement is made of this source.22The authors would like to thank Adolf Stroombergen, Gilian Lawrence, Martin Brown-Santirso, Julia Gretton and Arthur Grimes for very helpful contributions and comments.
✍ Numan-Parsons, Elisabeth; Iyer, Kris; Bartleet, Matthew 📂 Article 📅 2010 🏛 Elsevier 🌐 English ⚖ 173 KB