Search Results
Results 551 - 600 of 738
< 5 6 7 8 9 10 11 12 13 14 15 >
Yang X - - 1998
Since bovine in vitro fertilization became possible in the early 80s, a lot of effort has been done to clarify the mechanisms of what seems more and more one of the crucial steps in this procedure, being oocyte maturation. Undoubtedly, many biological factors act together to prepare the immature oocyte ...
Fanchin R - - 1998
OBJECTIVE: Our purpose was to assess the possible relationship between human embryo growth rates and sexual differentiation. STUDY DESIGN: We analyzed 142 conceptional in vitro fertilization and embryo transfer cycles undertaken in 137 women (151 embryos transferred) in which each embryo transferred led to a gestational sac. Embryos were sorted ...
Zwaan J - - 1997
A 4-month-old infant received an accidental intraocular injection of methylprednisolone while undergoing penetrating keratoplasty for congenital, hereditary endothelial dystrophy. This was not discovered until 4 months later, at which time the intraocular pressure (IOP) was increasing and an early cataract was forming. A lensectomy and vitrectomy were performed when the ...
Kurinczuk J J - - 1997
OBJECTIVE: To test the hypothesis that liveborn infants conceived by intracytoplasmic sperm injection are at an increased risk of having a major birth defect. DESIGN: Reclassification of the birth defects reported in infants born after intracytoplasmic sperm injection in Belgium and comparison with prevalence estimated in Western Australian population by ...
Fox H - - 1997
The clinicopathological features of hydatidiform moles are described. Criteria are given for distinguishing between partial and complete moles and it is stressed that this distinction can be difficult when complete moles are detected, by ultrasound, at an early stage of their development: the diagnostic value of cytometry is emphasized. The ...
Hlywka J J - - 1997
Chicken embryos and brine shrimp naulpii were utilized in short-term toxicity bioassays to assess their sensitivity to the mycotoxin fumonisin B1 (FB1). Fertile chicken eggs (Cobb x) were dosed with FB1 on day 2 of incubation by the injection of 100 microliters of aqueous solution into the air space of ...
Strong C - - 1997
Some have argued that embryos and fetuses have the moral status of personhood because of certain criteria that are satisfied during gestation. However, these attempts to base personhood during gestation on intrinsic characteristics have uniformly been unsuccessful. Within a secular framework, another approach to establishing a moral standing for embryos ...
Porcu E - - 1997
OBJECTIVE: To describe the first birth achieved after intracytoplasmic sperm injection (ICSI) of cryopreserved human oocytes. DESIGN: Case report. SETTING: University of Bologna Hospital, Department of Obstetrics and Gynecology, Reproductive Endocrinology Unit, IVF and Infertility Center. PATIENT(S): One patient undergoing IVF. INTERVENTION(S): Transvaginal ultrasound-guided oocyte retrieval followed by oocyte freezing. ...
Jimenez C - - 1997
OBJECTIVE: To assess whether sperm recovered from postejaculatory urine and cryopreserved can be used successfully for intracytoplasmic sperm injection (ICSI). DESIGN: Case report. SETTING: Laboratory of Developmental and Reproductive Biology, University Hospital. PATIENT(S): A couple with male infertility resulting from complete retrograde ejaculation. INTERVENTION(S): Freezing of sperm recovered from urine ...
Castellotti D S - - 1997
OBJECTIVE: To present a successful transfer of microhatched embryos to the fallopian tubes via microlaparoscopy. DESIGN: Case report. SETTING: Private practice affiliated with a medical university. PATIENT: A 40-year-old woman with primary infertility, mildly elevated baseline FSH levels, and a history of poor ovarian response to ovulation induction. Her husband ...
Meng L - - 1997
Genetically identical nonhuman primates can provide a powerful animal model for gene therapy and research activities where the physiological parameters directly or indirectly under study are heritable. Here we demonstrate that nuclear transfer is a viable technology for the production of identical rhesus macaques. Oocytes recovered from gonadotropin-treated females were ...
Bedford J M - - 1997
The gametes of the least shrew, Cryptotis parva, were studied in regard to their maturation and structure, and with particular emphasis on their behavior in the fallopian tube, from the time of ovulation until the appearance of two-cell embryos beginning some 9 h after ovulation. Cryptotis spermatozoa are organized according ...
Godfrey R W - - 1997
Two trials were conducted to evaluate the efficacy of oestrous synchronisation procedures in St. Croix White, Barbados Blackbelly hair and Florida Native wool ewes. In Trial 1 (conducted in June), 27 ewes were treated with controlled internal drug release (CIDR) devices for 12 days (CIDR1) and 29 untreated ewes served ...
Edirisinghe W R - - 1997
This case report describes the birth of a baby following the transfer of cryopreserved embryos generated from intracytoplasmic sperm injection (ICSI) carried out on the second day after oocyte pick-up of in-vitro-matured metaphase I and germinal vesicle stage oocytes. The couple had a history of three failed intrauterine insemination attempts ...
Soley J T - - 1997
Nuclear condensation during spermiogenesis in the ostrich follows the basic pattern established in other vertebrates. The fine granular nuclear substance of early spermatids is gradually replaced by numbers of coarse dense granules which appear to arise by aggregation of smaller dispersed elements of the chromatin. The granules increase in size ...
Dominko T - - 1997
The effect of maturational state of bovine oocytes at the time of insemination on early embryo development and the sex ratio of developing embryos was evaluated. Early maturing oocytes were inseminated either immediately after the first polar body extrusion or insemination was delayed for 8 h. Most of the zygotes ...
Nurmahmudi - - 1997
In this study, different methods of 0.2 M or 0.3 M CaCl2 delivery into hot-boned spent Leghorn breast fillets followed by tumbling were evaluated. The CaCl2 was delivered by adding 10% (wt/wt) solution into the tumbler, injection 10% (wt/wt) into the fillet, or soaking at room temperature for 15 min ...
Woods K L - - 1997
The goal of these experiments was to determine the effects of CaCl2 and NaCl injections on spent fowl meat tenderness and oxidative stability. Two hundred spent Leghorn hens were used in this two-part study. In the first experiment, breast fillets from 160 spent Leghorn hens were harvested immediately after death, ...
Donders G G - - 1997
BACKGROUND: Syphilis remains a major cause of premature birth, fetal and perinatal death, and congenital syphilis in South Africa, despite systematic antenatal screening by rapid plasma reagin and treatment with 2.4 million U of benzathine penicillin G. GOAL: To determine whether one injection of 2.4 million of U of benzathine ...
Adams C F - - 1996
We observed the effect of the 5-hydroxytryptamine synthesis inhibitor p-chlorophenylalanine on aggression in male firemouth cichlids (Cichlasoma meeki). p-Chlorophenylalanine-treated firemouths showed a significantly greater number of mirror-directed bites as compared with saline-injected controls. This finding is consistent with the effects of this drug on social aggression in mammals and birds ...
Hornung M W - - 1996
Use of fish-specific toxic equivalency factors (TEFs) to estimate the risk that exposure to polybrominated dibenzo-p-dioxins (PBDDs), dibenzofurans (PBDFs), and biphenyls (PBBs) pose to fish early life stage survival depends on validation of the hypothesis that these chemicals act additively to produce mortality. A rainbow trout early life stage bioassay ...
Ford-Jones E - - 1996
To determine the prevalence of infection with toxoplasmosis by country of birth and age in a sample of convenience. Banked sera and the computerized data base of demographic and other factors from an earlier epidemiological study were retrieved. Thirty-eight infant-toddler day care centres in Toronto. Day care providers from whom ...
Saha S - - 1996
In the present study, IVF bovine embryos were vitrified using as the cryoprotectants, ethylene glycol plus trehalose plus the polymer, polyvinylpyrrolidone (PVP). In Experiment I, toxicity of the vitrification solution (VS) containing 20% PVP was tested in relation to temperature and exposure time. One hundred percent embryo development was observed ...
Kraushar M F - - 1996
To prevent accidental intraocular injection after inadvertent single needle perforation of the eyeball, the authors recommend moving the needle and watching for corresponding movement of the globe following peribulbar or retrobulbar placement of the needle and prior to injecting. The authors have found this technique to be safe and reliable, ...
Walker M K - - 1996
Use of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) toxicity equivalents concentration (TEC) assumes that polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs) act additively and via a common mechanism to cause toxicity. To test these assumptions, 11 TCDD-like congeners and three non-TCDD-like congeners were combined at ratios typically found in Lake Michigan lake trout. ...
Nestor K E - - 1996
Japanese quail lines were divergently selected for 4-wk BW (HW and LW lines) and plasma yolk precursor [total plasma phosphorus (TPP); HP and LP lines] for 30 generations. The base population was a randombred control line (R1) that was maintained along with the selected lines. Sublines were established from the ...
Brown C R - - 1996
1. The ostrich industry in South Africa (and elsewhere) experiences a high rate of embryo mortality during artificial incubation of eggs. Most of this mortality takes place in the last l0-l4 d of incubation. 2. We carried out post-mortem examinations on 111 embryos that died within this period to assess ...
Irvine S - - 1996
OBJECTIVE: To determine whether the quality of semen has changed in a group of over 500 Scottish men born between 1951 and 1973. DESIGN: Retrospective review of data on semen quality collected in a single laboratory over 11 years and according to World Health Organisation guidelines. SETTING: Programme of gamete ...
Claeys D - - 1996
Human type A chronic gastritis or autoimmune gastritis (AIG) is associated with gastric H,K-ATPase-specific autoantibodies (HKAb). The pathogenic role of the HKAb and the triggering autoantigen(s) are unknown. In a mouse model, neonatal thymectomy (nTx) induces AIG, which is likely T cell mediated, although HKAb are always present. Our aim ...
Shalika S - - 1995
The purpose of this study was to determine the effects of a simplified 80% Mono-Percoll sperm separation procedure on both normal and male factor semen samples compared with the standard swim-up technique. The parameters examined include sperm concentration, motility and morphology, total motile functional spermatozoa and percentage recovery. Normal patients ...
Zabel E W - - 1995
Fish-specific toxic equivalency factors (TEFs), which relate the toxic potency of polyhalogenated aromatic hydrocarbons (PHAHs) to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) based on the endpoint of early life stage mortality, have been used in assessing the risk to fish early life stage survival of complex mixtures of PHAHs in feral fish eggs. Use ...
Ng E - - 1995
PURPOSE: A higher proportion of male offspring has been observed after transferring faster-developing embryos in a number of animal species. Therefore, we evaluated the correlation between the sex ratio of delivered babies and the cleavage stage of transferred embryos in a human IVF-ET program. METHODS: The sex of infants born ...
Patrizio P - - 1995
OBJECTIVE: To assess if epididymal sperm cryopreserved 24 hours after exposure to oocytes in conventional IVF can be successfully used for intracytoplasmic sperm injection (ICSI) in a subsequent cycle. DESIGN: Case report. SETTING: University of California, Irvine, Center for Reproductive Health. PATIENTS: Two men with obstructive azoospermia requiring microsurgical epididymal ...
Warkentin K M - - 1995
The life histories of many animals are characterized by niche shifts, the timing of which can strongly affect fitness. In the tree frog Agalychnis callidryas, which has arboreal eggs, there is a trade-off between predation risks before and after hatching. When eggs are attacked by snakes, tadpoles escape by hatching ...
Fujii S - - 1995
The NC-eob mice are mutants having open eyelids at birth with complete penetrance. Detailed scanning electron microscopy and light microscopy for study of the eyelid development of NC-eob embryos/fetuses were performed at days 13 to 17 of gestation and compared with normal NC mice, with the aim of investigating the ...
Puri P - - 1995
Fifty-two infants (75 ureters) with primary high-grade vesicoureteric reflux (VUR) treated endoscopically by subureteric injection of Polytef paste (STING) were followed up for 1-9 years. There were 30 boys and 22 girls and their ages ranged from 2 to 12 months. Forty-five percent of ureters had grade III VUR, 40% ...
Eid L N - - 1994
The objective of this study was to determine whether the initiation and length of the zygotic S-phase differs for embryos sired by bulls demonstrating high versus low fertility in vivo. Bovine oocytes were matured in vitro for 24-27 h and fertilized with frozen-thawed bovine semen. Six bulls that differed in ...
De Wolf D D Department of Paediatrics, University Hospital, Free University of Brussels, - - 1994
Adenosine is an endogenous nucleoside acting on coronary perfusion and myocardial conduction. Although the anti-arrhythmic effects of adenosine have been known for decades, interest in the use of adenosine or adenosine triphosphate (ATP- a precursor of adenosine) in termination of supraventricular tachycardia (SVT) has been renewed. We studied the use ...
Anderson S - - 1994
Butylated hydroxytoluene is an antioxidant that has antiviral properties and sustains sperm viability during freezing and thawing. A field trial involving 11 bulls and 19,000 AI was conducted to determine whether addition of .5 mM butylated hydroxytoluene to whole milk extender during seminal processing affected bull fertility as estimated by ...
French N A - - 1994
1. Turkey eggs were incubated at 36.5, 37.5 and 38.5 degrees C. The age of mortality, the incidence of malpositions and the incidence of morphological abnormalities were recorded from all unhatched eggs. 2. Eggs incubated at 36.5 degrees C hatched later than eggs incubated at 37.5 degrees C but did ...
Check J H - - 1994
Two centers have independently reported a higher rate of male to female births following insemination of sperm prepared by a modified swim-up technique. The principle of the modified swim-up is that a small percentage of the x-bearing sperm are the fastest and travel to the top of the supernatant, followed ...
Matsumura M - - 1994
Myocardial mitochondrial function after acute adriamycin exposure was compared in infant and adult mice. Heart mitochondrial were isolated 48 h after an intraperitoneal injection of adriamycin. Concentrations of adriamycin in serum and heart tissue were not significantly different between infant and adult mice. Oxygen consumption (state 3 respiration), and respiratory ...
Iwanaka T - - 1994
Infants with hemangiomas of the eyelid and orbit are at risk for amblyopia and refractive errors. Several methods of treatment for these tumors have been associated with complications and limitations. Five infants with these hemangiomas were treated by intralesional corticosteroid injection combined with short-term oral prednisolone. In an attempt to ...
Anderson M - - 1994
Follicle cells were removed by dissection from early vitellogenic oocytes of the cockroach Blattella germanica. The vibrating probe was used to record steady currents from 19 defolliculated oocytes and 19 intact follicles of the same developmental stage. Defolliculated oocytes generated currents that were stable and distinguishable (by intensity or selective ...
Wada I - - 1994
The objective of this retrospective study was to compare the birth characteristics and perinatal mortality of babies conceived from the use of cryopreserved embryos with those resulting from in-vitro fertilization (IVF) and fresh embryo transfer. A total of 232 consecutive births, one pregnancy termination and a total of 283 babies ...
Bylemans D - - 1994
Injection of crude extracts of late vitellogenic ovaries into staged females of the grey fleshfly Neobellieria (Sarcophaga) bullata inhibited oocyte development and biosynthesis of trypsin-like enzymes in the gut. Trypsin synthesis in N. bullata is cyclic and is correlated with egg development, which is discontinuous. A trypsin modulating oostatic factor ...
Butler A B - - 1994
The evolution of the dorsal thalamus in various vertebrate lineages of jawed vertebrates has been an enigma, partly due to two prevalent misconceptions: the belief that the multitude of nuclei in the dorsal thalamus of mammals could be meaningfully compared neither with the relatively few nuclei in the dorsal thalamus ...
Peebles E D - - 1993
The influence of creating and closing acoustic windows on embryonic and posthatch development for the purpose of chicken embryogenesis monitoring by real-time ultrasonography (US) was evaluated at 2, 6, 9, 14, and 17 days of incubation. Acoustic windows were closed using either a porous dialysis film and tape (FM) or ...
Williams M - - 1993
This study aimed to determine the number and distribution of spermatozoa within the human Fallopian tubes around ovulation. Parous women, undergoing total abdominal hysterectomy for menorrhagia, were inseminated with either partner's semen (3/10) or donor semen (7/10). Approximately 18 h later both Fallopian tubes were ligatured into ampullary, isthmic and ...
Halling A - - 1993
Neonatal female mice of the NMRI strain were treated s.c. with 5 micrograms of the synthetic oestrogen diethylstilboestrol (DES) or vehicle only (olive oil; controls) for the first 5 days after birth. Embryos at the two-cell stage from control females were transferred to the oviducts of control females or DES-treated ...
< 5 6 7 8 9 10 11 12 13 14 15 >