Barbara Hellenkemper
University of Münster
5 Papers
15 Citations
Barbara Hellenkemper is an academic researcher from University of Münster. The author has contributed to research in topics: Sperm & Semen. The author has an hindex of 4, co-authored 5 publications.
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Papers
Ten years' experience with an external quality control program for semen analysis
Con Mallidis,Trevor G. Cooper,Barbara Hellenkemper,Martin Lablans,Frank Ückert,Eberhard Nieschlag +5 more
TL;DR: Adherence to WHO recommendations is low, with the majority of laboratories using methods expressly opposed by the guidelines, and participation in QuaDeGA was found to improve the performance of the laboratories involved in the program.
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Dimensions of human ejaculated spermatozoa in Papanicolaou-stained seminal and swim-up smears obtained from the Integrated Semen Analysis System (ISAS®)
Giuseppe Bellastella,Trevor G. Cooper,Marina Battaglia,Anda Ströse,Inma Torres,Barbara Hellenkemper,Carles Soler,Antonio Agostino Sinisi +7 more
TL;DR: Objective measurements are required for computer-aided sperm morphometric analysis (CASMA) machines to distinguish normal from abnormal sperm heads, and small differences in head dimensions among men and after swim-up make it unlikely that technicians would be able to distinguish them.
Improving precision in the assessment of round cell numbers in human semen.
TL;DR: Poor precision in assessment of the number of round cells observed in the peroxidase test for detection of seminal leukocytes (granulocytes) could explain the discrepant reports on the acceptability of the cut-off values for leukocytospermia.
Method-related estimates of sperm vitality.
TL;DR: Comparison of methods that estimate viability of human spermatozoa by monitoring head membrane permeability revealed that wet preparations (whether using positive or negative phase-contrast microscopy) generated significantly higher percentages of nonviable cells than did air-dried eosin-nigrosin smears.
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Mountant-induced loss of Shorr-stained blue sperm tails.
TL;DR: It has been reported that Shorr staining provides additional morphological information on the motility of spermatozoa in semen, by distinguishing between red and blue flagella, but routine methods were unable to confirm these observations.