Sara Kjellberg

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Zinc-binding properties were studied in 'prostatic fluid', i.e. in seminal plasma from patients with agenesis of the Wolffian ducts, and in split-ejaculate fractions dominated by seminal vesicular fluid. The effect of seminal fluid, with different zinc-binding properties, on the stability of zinc-dependent sperm chromatin was assessed by exposing sperm to(More)
Zinc excreted from the human prostate secures a high content of zinc in the sperm nucleus and contributes to the stability of the quaternary structure of the chromatin. After ejaculation, in vitro, a second type of stability, most probably involving disulfide-bridge crosslinks, supersedes the zinc-dependent stability. Normally, the nucleus of the ejaculated(More)
Ejaculated and vasal sperm were obtained from men referred for vasectomy, and sperm nuclear elements were determined by X-ray microanalysis. Sperm head zinc concentrations, expressed as the ratio Zinc to Sulphur, were significantly higher in ejaculated than in vasal sperm. A physiological sperm nuclear zinc uptake is discussed in relation to sperm chromatin(More)
The composition of seminal plasma in the sperm-rich split ejaculate fraction was studied in a group of men with a low zinc content in their sperm chromatin, to evaluate the availability of zinc at ejaculation. Men with low-chromatin zinc had, in the sperm-rich split-ejaculate fraction, high amounts of seminal-vesicular fluid, a low zinc:fructose molar(More)
The stability and the content of zinc of the chromatin were studied in spermatozoa from ten men with unexplained infertility, and in spermatozoa from five fertile donors. A positive relation was found between zinc in sperm nuclei (X-ray microanalysis) and the resistance of the chromatin to decondense in sodium dodecylsulfate (SDS). The infertile men had(More)
Introduction. Examines how an analytical framework of situated genre analysis can be used to study how research blogs are constructed and used as tools in scholarly communication. Method. A framework was extracted from genre research theories consisting of four concepts: aim, form, content and context. The term situated genre was used to focus on social(More)
Sperm chromatin stability and zinc binding properties were studied in semen samples from 115 men living in barren unions. Of these men, 26% had a high proportion of swelling sperm, i.e. less than 80% sperm with stable chromatin after exposure to the detergent sodium dodecyl sulphate. From 2-67% of seminal zinc was bound to high molecular weight ligands of(More)
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