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Biomedical subjects

H J Glander

Publications and source records attributed to H J Glander.

At least 91 records · Page 5Linked to original sources
PubMed1979

[Effect of pellet size on respiratory activity and motility of cryopreserved spermatocytes].

The effect of different pellet volumes at freeze preservation in human semen was studied. It was measured the motility of spermatozoa during an incubation time of several hours at 37 degrees C and the alteration of oxygen consumption after adding rotenone, succinate, digitonine or 2,4-dinitrophenol. - The motility of cryopreserved spermatozoa does not show significant differences after preservation procedure. In respect of oxygen consumption the smallest differences from native material were obtained at a pellet volume of 0,2 to 0,3 cm3. Explanations for this behaviour are discussed.

Digitonin↗
PubMedDate not supplied

Absence of Yq microdeletions in infertile men.

Microdeletions of the long arm of the Y chromosome (Yq) were described in men with idiopathic azoo- or oligozoospermia and seem to cause impairment of spermatogenesis. Deletion frequencies differ considerably among selected infertile men. The aim of this study was to investigate the prevalence of Yq microdeletions in patients with idiopathic infertility. Men with azoospermia or oligozoospermia resulting from endocrine or obstructive causes or with a constitutional cytogenetic anomaly were excluded. Ninety-seven patients presenting at infertility centers in Leipzig and Zurich were included in the study. Sixty-four (66%) of them were severely oligozoospermic (sperm concentrations < 5 x 10(6)/mL) and 33 (36%) were azoospermic. A sequence-tagged site (STS) PCR strategy was applied for the microdeletion screening. Thirteen STS markers spanning the whole euchromatic region of Yq were used. No Y-chromosomal microdeletion could be detected in these 97 infertile men. This result suggests a much lower Yq deletion frequency than previously thought, even among strictly selected patients with idiopathic azoo- or oligozoospermia.

Adolescent↗
PubMedDate not supplied

Monosaccharide transport across membranes of human spermatozoa. I. Development of a radiochemical method of measuring monosaccharide uptake by spermatozoa.

A method for determination of the monosaccharide uptake into human spermatozoa is described. Intracellular monosaccharide concentrations were calculated on the basis of determination of intracellular radioactivity after incubation of the cells with labelled monosaccharide and using a mathematical procedure to approximate the intracellular space of spermatozoa. The D-fructose uptake depends on the extracellular D-fructose concentration in a hyperbolic manner. Half maximal saturation is present at 4,1 mM. This corresponds closely with the lowest limit of D-fructose concentration in human fertile semen.

Biological Transport↗
PubMedDate not supplied

Risk of transmission of sexually transmitted diseases by cryopreserved semen.

The increasing incidence of sexually transmitted diseases (STD) involves the risk of the transmission of these diseases by the artificial insemination. Therefore the cryotolerance of several microorganisms causing STD and the efficiency of penicillin of the cryoprotective medium (CMP) against Neisseria gonorrhoeae (N.g.) were investigated. The results have shown that penicillinase-producing N.g. (PPNG), genital mycoplasmas and Candida species survive the cryopreservation. Trichomonas vaginalis could not be recultivated after our temperature-time-regimen of the cryopreserving process. CPM with penicillin was unable to prevent a transmission of penicillin-sensitive N.g.

Candida↗
PubMedDate not supplied

The equatorial fibronectin band (EFB) on human spermatozoa--a diagnostic help for male fertility?

Spermatozoa were prepared by swim up technique in the same way as for in vitro fertilization of human eggs and incubated with antihuman fibronectin antibodies in the immunofluorescence technique. Fibronectin mediates adhesive interactions between cells. 69 p.c. of spermatozoa with a normal shape and only 17 p.c. of them exhibiting a pathological shape showed a positive fibronectin-fluorescent band on the equatorial segment, called equatorial fibronectin band (EFB). The cryopreservation of semen did not influence the EFB. The significance of EFB for the sperm-oocyte-binding is discussed in connection with the sperm morphology and epididymal function.

Female↗
PubMedDate not supplied

Sperm motile efficiency (SME) of fresh spermatozoa in a hypotonic medium correlates with their cryosurvival in fertile men and infertility patients (predicting test).

The sperm motile efficiency (SME) of fresh spermatozoa in a hypotonic medium was investigated concerning the prediction of post thaw motility and the differentiation between fertile men and infertility patients. A total of 95 semen samples were collected for this study. Twenty of these samples were obtained from semen donors of proven fertility and 75 samples were collected from male partners of infertile couples. There were no significant differences between the SME after mixture of the fresh semen with a 140 mOsm saline in equivalent volumes and after cryopreservation (Wilcoxon-matched pairs signed ranks-test) but a significant positive correlation between the SME after both treatments of semen samples was notable. Significant differences between the fertile control group and group of infertility patients could be determined concerning the SME after mixing of fresh semen with 140 mOsm saline as well as after cryopreservation (Mann-Whitney-U-test). The discriminant analysis revealed a most discriminating effectiveness for SME immediately after the addition of hypoosmotic saline.

Freezing↗
PubMedDate not supplied

Electrophoretic patterns of spermatozoal nucleoproteins (NP) in fertile men and infertility patients and comparison with NP of somatic cells.

During spermatogenesis in mammals the evolutionary early histones are replaced step by step by more species specific nucleoproteins (protamines). The protamines protect the genetic information of the male against mutagenic or other damaging influences and possibly play a role in male fertility. A method was presented to study the nucleoproteins (NP) of single human ejaculates. This procedure was checked concerning its usability and validity by bull spermatozoa. The NP of cryopreserved human spermatozoa of fertile men and of infertility patients were investigated and compared with the electrophoretic patterns of NP of somatic hepatocytes of rat and mouse. A total of 48 semen samples were studied. Ten of these samples were obtained from semen donors of proven fertility and 38 samples were collected from male partners of infertile couples. Photodensitometrically it could be distinguished between percentages of non-protamines (PNP) and percentages of protamines (PP). The PP varied intra-individually with a mean standard deviation of 34%, analogously to the alterations of classical semen parameters. The PP of fertile men did not significantly differ from the infertility patients with normal spermiogram parameters but showed a significantly higher value compared with the semen samples with pathological spermiograms. On average the PP of all infertile patients were significantly lower than the PP of fertile semen donors.

Animals↗