Evaluation of the number of spermatozoa in bull semen. A comparison between electronic counting, light scattering and absorptiometry

1964 ◽  
Vol 62 (2) ◽  
pp. 219-223 ◽  
Author(s):  
Simon Iversen

The number of spermatozoa in bull semen was determined by electronic counting, light scattering and absorptiometry. Electronic counting was found to be accurate, fast and reliable and seems to be the method of choice.Determination of the light scattering was found to be the more sensitive of the indirect methods, but absorptiometry also yields consistent and reliable results. The accuracy obtained by absorptiometry was found to be independent of the sensitivity of the instrument.

1988 ◽  
Vol 53 (8) ◽  
pp. 1735-1744 ◽  
Author(s):  
Jitka Horská ◽  
Jaroslav Stejskal ◽  
Pavel Kratochvíl ◽  
Aubrey D. Jenkins ◽  
Eugenia Tsartolia ◽  
...  

An attempt was made to prepare well-defined graft copolymers by the coupling reaction between acyl chloride groups located along the backbone chain and monohydroxy-terminated grafts prepared separately. The molecular weights and the parameters of heterogeneity in chemical composition of the products were determined by light scattering and osmometry. The determination of molecular characteristics revealed that the degree of grafting was low. The results therefore could not be confronted with a statistical model at this stage. The problems encountered in the synthesis, e.g., gel formation, and the data relating to the soluble products are discussed.


2013 ◽  
Vol 29 (1) ◽  
pp. 43-51 ◽  
Author(s):  
U. Gianfranco Spizzirri ◽  
Donatella Restuccia ◽  
Manuela Curcio ◽  
Ortensia I. Parisi ◽  
Francesca Iemma ◽  
...  

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