International Collaborative Evaluation of the ATB 32 Staph gallery for Identification of the Staphylococcus Species

1990 ◽  
Vol 273 (3) ◽  
pp. 319-326 ◽  
Author(s):  
Yvonne Brun ◽  
Michèle Bes ◽  
Jean Marc Boeufgras ◽  
Daniel Monget ◽  
Jean Fleurette ◽  
...  
Keyword(s):  
International Collaborative ◽  
Collaborative Evaluation

An International Collaborative Study to Investigate Standardisation of Hirudin Potency

1993 ◽  
Vol 69 (05) ◽  
pp. 430-435 ◽  
Author(s):  
Colin Longstaff ◽  
Man-Yu Wong ◽  
Patrick J Gaffney
Keyword(s):  
Specific Activity ◽  
Collaborative Study ◽  
Residual Activity ◽  
Quality Standard ◽  
Upper Limit ◽  
Assay Procedure ◽  
Specific Activities ◽  
International Collaborative ◽  
Range Of Values ◽  
International Collaborative Study

SummaryAn international collaborative study has been carried out to investigate the reproducibility of hirudin assays in 13 laboratories using four recombinant hirudins and one natural, sulphated product. A simple assay procedure was proposed involving the titration of α-thrombin with inhibitor and measurement of residual activity using a chromogenic substrate. A standard α-thrombin preparation was supplied to ensure that this reagent was of uniform quality throughout the study. The method appeared to present no difficulties and laboratories reported similar potencies for the 5 hirudin samples, in line with expected values. This gave 200–222 Thrombin Inhibitory Units/ampoule (TIU/ampoule) of lyophilised hirudin, with geometric coefficient of variation (gcv) values ranging from 10.15–15.97%. This corresponds to specific activities of approximately 14,300–15,900 TIU/mg protein. This is close to the upper limit of previously reported values of specific activity. We conclude that the precision of this determination compared with the wider range of values in the literature (8,000–16,000 thrombin inhibitory units [TIU]/mg) results from the use of good quality standard α-thrombin by all laboratories. This study has important implications for hirudin standardisation.

A Collaborative Study Designed to Establish the 4th International Standard for Heparin

1984 ◽  
Vol 52 (02) ◽  
pp. 148-153 ◽  
Author(s):  
D P Thomas ◽  
A D Curtis ◽  
T W Barrowcliffe
Keyword(s):  
Collaborative Study ◽  
International Standard ◽  
Thrombin Inhibition ◽  
Freeze Dried ◽  
Assay Methods ◽  
The Mean ◽  
International Collaborative ◽  
International Collaborative Study

SummaryAn international collaborative study, in which 22 laboratories participated, was carried out to establish a replacement for the International Standard for Heparin. A total of 248 assays were analyzed, including APTT, thrombin inhibition and anti-Xa assays, as well as pharmacopoeial assays. Overall, there was less than 5% difference in the mean potency estimates of the candidate preparations, by all assay methods. The freeze-dried preparation 82/502 demonstrated the closest parallelism by bioassay to the existing standard and was established by WHO as the 4th International Standard for Heparin, with an assigned unitage of 1780 i.u. per ampoule.

The Unparalleled Growth of COVID-19 Publications (Preprint)

2020 ◽  
Author(s):  
Paul Fontelo ◽  
Mrigendra Bastola ◽  
Craig Locatis ◽  
Fang Liu
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Evidence Base ◽  
Research Papers ◽  
Global Pandemic ◽  
The Us ◽  
International Collaborative ◽  
Number Of Publications ◽  
Collaborative Publishing

UNSTRUCTURED The global pandemic of COVID-19 has generated an unprecedented number of research papers from clinicians and scientists worldwide. We searched PubMed for articles on coronaviruses from 1970 to June 2020. Surges of publications occurred in 2003 from SARS and, again in 2012 from MERS. Although the name COVID-19, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was only announced by WHO in February 2020, the number of publications has already exceeded 16000 by June this year. China and the US lead in publications, but a significant number also come from countries hardest hit by the illness. International collaborative publishing is significant. Since these publications are generally free to access worldwide, it provides a rich evidence base for clinicians and scientists combatting the COVID-19 pandemic.

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