Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"sperm morphology"”.
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Correlative Analysis of Sperm Morphology, Seminiferous Epithelial Area and Testis Weight in the Boar
… of 300 boars were collected at an abattoir. Sperm samples from both right and left cauda epididymis of each boar were collected from which two groups were identified using the criterion in the frequency of sperm abnormalities. Group A (Normal) had a frequency of abnormal spermatozoa …
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Aneuploidy and DNA fragmentation in morphologically abnormal sperm
Introduction: Intracytoplasmic sperm injection (ICSI) has been a successful assisted reproductive technique for men with severe male-factor infertility. However, ICSI requires the subjective selection of normal looking sperm, which does not preclude the transmission of genetically abnormal sperm. …
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Male gamete morphology in relation to swimming velocity and fertilisation microenvironment
The heterogeneity of spermatozoa has been widely used to inform phylogenetic relationships among taxa, yet the reason such diversity has evolved, in relation to the sperms primary functional role in fertilisation and reproduction, is not well understood. Research into the evolutionary significance …
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Marine invertebrate sperm: assessment of sperm quality using computer-aided sperm analysis
… midae (Gastropoda) were investigated. The sperm morphology and base-line data were gathered concerning the sperm concentration, motility and sperm kinematic parameters using computer-aided-sperm analysis (CASA). Sperm morphology and sperm motility play an important role in determining sperm …
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STRUCTURAL AND FUNCTIONAL CHARACTERIZATION OF THE PANAMANIAN GOLDEN FROG (ATELOPUS ZETEKI) SPERMATOZOA – IMPACT OF MEDIUM OSMOLALITY AND CRYOPRESERVATION ON MOTILITY AND CELL VIABILITY
… dissertation were: 1) characterize the general sperm parameters and assess the effect of hormonal stimulation on motility, forward progressive motility, DNA integrity, sperm morphology and seasonality; 2) identify the effect of extracellular conditions, mainly dilution and temperature, on …
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Effects of elevated testicular temperature on viability of cryopreserved semen and morphological characteristics of ejaculated spermatozoa
… integrity) and morphological characteristics of sperm before and after thermal insult were examined. For assessment of results, collection days were grouped: days -6, -3, 0 = Period 1 (d 0 = day of testis coverage after semen collection on that day), days 3, 6, 9 = Period 2 , days 12, 15...39 = …
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Andrological Methods of Predicting the Pregnancy Outcome of an <i>in vitro</i> Fertilization Program
… infertility rate can be as high as 50%. Since sperm count and percent of motility alone do not appear to be strong predictors of IVF outcome especially when these parameters are not severely abnormal, a multivariable analysis of other parameters was made. In addition, because many IVF centers …
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The Small GTPase Rheb Is Required for Spermatogenesis but not Oogenesis
… and have identified an essential role in spermatogenesis. Conditional knockout (cKO) of Rheb in the male germline resulted in severe oligoasthenoteratozoospermia and male sterility. More detailed phenotypic analyses uncovered an age-dependent meiotic progression defect combined with …
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Evaluation of Different Concentrations of Egg Yolk in Canine Frozen Semen Extender
… cryoprotectant, by examining the motility and morphology throughout the freezing process: initial (baseline after extender added), post-cool (after three hours at 5"C) and post-thaw (after freezing.) Initial values of pH, osmolarity, motility and morphology were obtained for comparison of the …
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Studies Into the Significance of Distal Cytoplasmic Droplets in Porcine Semen
… sows. Experimental groups consisted of heterospermic doses containing either 3 x 109 total sperm with normal morphology exceeding 80% (TSN), 3 x 109 'viable' sperm with normal morphology exceeding 80% (VIABLE), 3 x 109 total sperm with a mean of 25.6% DD and fewer than 20% other morphological …
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The effects of the cervix on the transport of morphologically abnormal spermatozoa in the female bovine
… role of the bovine cervix in filtering abnormal sperm. ln Study 1, semen containing high levels of abnormal sperm was vaginally deposited in 12 cows 80 hours after prostaglandin F₂α treatment. At slaughter, 4-, 8- or 12 hours post-insemination, sperm were flushed from the excised uteri with …
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Physiological and Molecular Consequences of Large Y Chromosome Long Arm Deletions in Mice
… or reduced representation has been linked to sperm defects and offspring sex ratio distortion in favour of females. Understanding the biological mechanisms of sex ratio distortion and related sperm aberrations could not only result in benefits for fertility research, but also in the …
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Effect of vaccination against porcine circovirus type 2 (PCV2) on ejaculate characteristics and the shedding of virus in boar semen
… controls and received 2 ml 0.9% saline (n = 5). Sperm concentrations and characteristics of sperm motility were assessed using a computer-assisted sperm analysis system (Hamilton Thorne Research, Beverly, MA) and sperm morphology was evaluated after staining using light microscopy. The PCV2 …
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Does traditional Chinese medicine improve semen morphology, motility and count? : a pragmatic randomised clinical trial
… on the semen parameters, count, motility and morphology to no treatment at all. Design: A pragmatic randomised controlled study. Setting: Participants received Chinese medicine treatment at a private clinic, the Rozelle Acupuncture and Chinese Medicine Centre, while semen samples were analysed …
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Pharmakologisch unterstützte manuelle Spermagewinnung und computergestützte Spermienkopfmorphometrie beim Breitmaulnashorn (Ceratotherium simum)
… manual semen collection and computer assisted sperm head morphometry in the white rhinoceros (Ceratotherium simum) In this study the influence and applicability of pharmacologically enhanced semen collection in the white rhinoceros (Ceratotherium simum) was investigated. Obtained semen samples …
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A retrospective analysis of semen samples and reproductive hormones in Africa and the middle east
… Basic semen parameters such as semen volume, sperm concentration, total sperm count, progressive motility, total progressively motile count, sperm morphology, total normal sperm count, and functional sperm count such as DNA fragmentation, sperm viability and oxidation-reduction potential (ORP) …
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The Maintenance of Male Color Polymorphism in Poecilia parae
… traits, such as testes investment and sperm morphometry that complement the specific tactic. For instance, immaculata males are often categorized as an `unattractive' male by females, which is correlated to its phenotypical appearance (smaller and drab). However, this morph is …
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cell motility and machine learning
… We also applied the machine learning method on sperm classification and quantum many body problem. In sperm classification, we could get around 70\% accuracy with balanced good and poor example. In quantum many body problem, we proposed a deep neural network to calculate the ground-state …