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Results 401 - 450 of 1204
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Ingram J N - - 2001
Marsupials have two anatomically separate uteri; and in macropodids (kangaroos and wallabies), there is a single ovulation from alternate ovaries in each cycle. During late pregnancy, the two uteri are differentially regulated by local hormonal influences from the corpus luteum, the fetus, and placenta on one side and by the ...
Novak J - - 2001
Marked vasodilation in the kidney and other nonreproductive organs is one of the earliest maternal adaptations to occur during pregnancy. Despite the recognition of this extraordinary physiology for over four decades, the gestational hormone responsible has remained elusive. Here we demonstrate a key role for relaxin, a member of the ...
Zhao S - - 2001
The growth of the cervix and vagina that occurs during the second half of rat pregnancy is accompanied by an increase in both epithelial and stromal cells. Neither the mechanism(s) that regulates this accumulation of cells nor its hormonal control is known. To test the hypothesis that the rate of ...
Geisert R D - - 2001
During early pregnancy, pig conceptuses initiate the synthesis of oestrogens and on day 12 their trophoblastic membranes undergo a rapid expansion throughout the uterine horns. The insulin-like growth factor (IGF) system may be involved with conceptus development and steroidogenesis in pigs. Changes in uterine luminal IGF, insulin-like growth factor binding ...
Babischkin J S - - 2001
The present study determined whether morphological differentiation of placental villous cytotrophoblasts into syncytiotrophoblast during primate pregnancy was developmentally regulated and whether oestrogen has a role in this process. Placental volumetric composition of the cytotrophoblast and syncytiotrophoblast was determined by the test-point counting method on days 45-54, 60, 100, and 170 ...
Magness R R - - 2001
Normal pregnancy and the follicular phase of the ovarian cycle are both estrogen-dominated physiological states that are characterized by elevations in uterine blood flow and endothelial nitric oxide synthase (eNOS) protein expression in the uterine artery (UA) endothelium. It is unknown if elevations in mRNA level account for the changes ...
Allen W R - - 2001
The equine embryo takes 6 days to traverse the oviduct and, when it finally enters the uterus, it remains spherical in shape and moves continually throughout the uterine lumen until day 17 after ovulation to deliver its maternal recognition of pregnancy signal to the entire endometrium. Between day 25 and ...
Trujillo M - - 2001
The contractile effect of okadaic acid (OA), a highly selective inhibitor of protein serine/threonine phosphatases, was analyzed in the rat uterus during the estrous cycle and during the course of pregnancy. Contractile effects were related to circulating levels of estrogen and progesterone and to mRNA levels of myosin light chain ...
Harazono A - - 2001
4-tert-Octylphenol (OP) is an alkylphenol that is an intermediate in the production of alkylphenol ethoxylates. OP has been reported to be the most potent estrogenic alkylphenol in vitro. In the present study, the effects of OP on initiation and maintenance of pregnancy were investigated in rats. Inseminated female rats were ...
Sato T A - - 2001
We sought to determine whether the gestational age of the pregnant mouse had any relationship with its lipopolysaccharide (LPS) responsiveness. Murine decidual caps from days 13, 15 and 17 of gestation (term is day 20) were dissected out, placed in inserts and equilibrated in media overnight. The following day, media ...
Albrecht B A - - 2001
In the pregnant mare, luteal estrogen production increases at the onset of equine chorionic gonadotropin (eCG) secretion by endometrial cups. In previous studies, we have demonstrated that eCG stimulates luteal androgen and estrogen production in pregnant mares. To further elucidate the regulation of steroidogenesis within the equine corpus luteum (CL) ...
Bunck C F - - 2001
The fibrinolytic system was studied during the oestrous cycle of nonpregnant (n = 12) and pregnant (n = 12) bitches. Blood samples were taken during late pro-oestrus, at ovulation, at days 1, 5, 10, 15, 20, 25, 30, 40, 50, 60, 90 and 120 of metoestrus, and during anoestrus. The ...
Buff S - - 2001
A new kit (ReproCHEK RELAXIN) intended for the diagnosis of pregnancy in bitches is now available for veterinary use. This assay measures relaxin concentrations in plasma and whole blood samples, and the presence of significant amounts of relaxin is indicative of pregnancy. A clinical trial was carried out to evaluate ...
Bruce N W - - 2001
Apoptosis is associated with regression of corpora lutea (CL) in a number of species. The present work compared apoptotic rates, assessed by low molecular weight DNA labelling, in rat CL of the oestrous cycle, pregnancy, the immediate post-partum period, and in vitro culture. Apoptosis was significantly related to cycle phase ...
Allen W R - - 2001
A tough, elastic glycoprotein capsule envelops the equine blastocyst between Days 6 and 23 after ovulation. It maintains the spherical configuration of, and provides physical support for, the embryo as it traverses the entire uterine lumen during Days 6-17, propelled by myometrial contractions that are stimulated by pulsatile release of ...
Hill J R - - 2000
The production of cloned animals is, at present, an inefficient process. This study focused on the fetal losses that occur between Days 30-90 of gestation. Fetal and placental characteristics were studied from Days 30-90 of gestation using transrectal ultrasonography, maternal pregnancy specific protein b (PSPb) levels, and postslaughter collection of ...
Illingworth I M - - 2000
Dynamic regulation of intercellular junctions is an essential aspect of many developmental, reproductive, and physiological processes. We have shown that expression of the desmosomal protein desmoplakin decreases in the luminal uterine epithelium during the preimplantation period of pregnancy in mice. By the time of implantation (between Days 4.5 and 5 ...
Tantasuparuk W - - 2000
The aim of the present study was to investigate the influence of lactation length (LL) on weaning-to-service interval (WSI), and the effect of LL and WSI on the subsequent farrowing rate and litter size among purebred Landrace and Yorkshire sows under tropical conditions. The variation in litter weight at weaning ...
Augustin H G - - 2000
Vascular morphogenesis through mechanisms of vasculogenesis, angiogenesis and intussusception is associated primarily with embryonic and fetal development and is down-regulated in the healthy adult. Physiological angiogenesis in the adult is restricted to the female reproductive system where it occurs cyclically in the ovary and the uterus as well as pregnancy-associated ...
Sugino N - - 2000
To investigate the relationship between apoptosis and the Bcl-2/ Bax system in the human corpus luteum (CL), the frequency of apoptosis and expression of Bcl-2 and Bax were examined in the CL during the menstrual cycle and in early pregnancy. In situ analysis of DNA fragmentation showed that the number ...
Silva P J - - 2000
To examine possible mechanisms involved in resistance of the ovine corpus luteum to the luteolytic activity of prostaglandin (PG)F(2alpha), the enzymatic activity of 15-hydroxyprostaglandin dehydrogenase (PGDH) and the quantity of mRNA encoding PGDH and cyclooxygenase (COX-2) were determined in ovine corpora lutea on Days 4 and 13 of the estrous ...
David A L - - 2000
OBJECTIVE: To investigate liver function tests (LFTs) changes in the puerperium and the influence of specific obstetric events on these changes. DESIGN: A longitudinal observational study. SETTING: West Middlesex University Hospital, Twickenham. POPULATION: Ninety-four women with uncomplicated pregnancy who delivered at term. METHODS: Aspartate transaminase (AST), alanine transaminase (ALT), gamma ...
De Resnis F - - 2000
Two operators attempted to detect pregnancy ultrasonographically in 196 sows daily from 15 to 25 days after insemination; 20 unbred sows were also investigated. The probe was applied transcutaneously on the right abdominal wall near the last three mammary glands. During each examination, the embryos were visualised and their transverse ...
Oon V J - - 2000
The corpus luteum (CL) is an important endocrine organ in the menstrual cycle and in pregnancy. The regulation of its hormonal production has been extensively studied. The steroidogenic abilities of the CL can be rescued by human chorionic gonadotrophin (HCG) but its role in the maintenance of CL function is ...
Driancourt M A - - 2000
Ovarian follicular growth and maturation and its control throughout pregnancy have not been described fully in sheep. Experiment 1 characterized the size and maturation (steroid production in vitro and aromatase activity) of ovarian follicles obtained at days 20, 50, 80 and 110 of pregnancy compared with those obtained at day ...
Ema M - - 2000
The present study was conducted to evaluate the adverse effects of dibutyltin dichloride (DBTCl) on initiation and maintenance of pregnancy after maternal exposure during early pregnancy in rats. After successful mating, female rats were given DBTCl by gastric intubation on Days 0 to 3 or on Days 4 to 7 ...
Nishi M - - 2000
Employing the vital statistics from January 1, 1979 to December 31, 1994 in Hokkaido Prefecture, Japan, we investigated the relationship between suicide (ICD 9 code, El15) and days of the week. In one day 1.97 males and 0.98 females committed suicide on average. On Saturdays the number of suicides per ...
Bregante M A - - 2000
1. The aim was to investigate the pharmacokinetics of diltiazem (DTZ) and its metabolites, deacetyldiltiazem (M1) and N-demethyldiltiazem (MA), in the pregnant rabbit following DTZ intravenous administration. In addition, DTZ tissue distribution in both the non-pregnant and pregnant rabbit and foetuses was also studied. 2. The slope of the alpha- ...
Yue Z P - - 2000
This goal of this study was to examine immunohistochemical distribution of leukemia inhibitory factor (LIF), LIF receptor (LIFR), and glycoprotein (gp) 130 in rhesus monkey uterus during the menstrual cycle and early pregnancy. Pregnancy rate was significantly reduced in the control group from 66.7% (12 of 18) to 22.2% (4 ...
Iwagaki T - - 2000
Various strains of mice have been used for hearing research, but there have been few reports regarding the cochlear vasculature in mice. In this study, the development of the cochlear vasculature was investigated in C57BL/6 mice from day 15 of gestation to day 15 after birth, and mature vessels were ...
Zheng J - - 2000
We evaluated the expression of endothelial (eNOS) and inducible (iNOS) nitric oxide (NO) synthases, NO production, and the role of angiotensin II (ANG II) in regulating NO production during late ovine pregnancy (day 110-142). Samples of the following tissues were obtained: fetal [cotyledonary (COT)] and maternal [caruncular (CAR)] portions of ...
Macdonald A A - - 2000
Scanning electron microscopy was used to examine the microstructure of the maternal and fetal placenta from 25 pregnant ponies (Equus caballus) throughout the second half of gestation. Samples of placenta, 2-6 cm(2)in area, were collected from the antimesometrial region of the pregnant horn at 105 days (n=1), 165-219 days (n=5), ...
Salvetti N R - - 2000
Most studies on the biochemistry and structure of the corpus luteum have focused on elucidating the processes of progesterone synthesis and release. In the present work, the histochemical composition of the corpus luteum of the rat was evaluated using lectinhistochemistry on rats at the end of pregnancy (days 18-23). We ...
Vyas S - - 2000
Ovaries of 17 adult, pleuriparous, and lactating one-humped she-camels (Camelus dromedarius) were examined per rectum for uterine involution and for presence of follicles (>/=1.0 cm diameter) by real-time ultrasonography at the National Research Centre on Camel at Bikaner, India at 30, 45, 60, 75, and 90 days postpartum. Involution was ...
Png F Y - - 2000
Ultrastructural changes in the plasma membrane of uterine epithelial cells in the pseudopregnant rat were examined to determine if these changes resemble those found during normal pregnancy and also to examine if the well-known membrane alterations of early pregnancy are intrinsic to uterine epithelial cells. Changes in the surface contours ...
Seier J V - - 2000
Twenty early pregnancies were diagnosed and monitored in vervet monkeys by ultrasonography. Non-gravid uteri became increasingly echogenic from cycle days 7 to 26. The first definite sign of pregnancy was a gestational cavity of 2 mm (+/- 0.80) at 33.0 (+/- 1.48) days menstrual age, which was also used to ...
Bowen J A - - 2000
In order for pregnancy to be established, the conceptus of domestic animals must signal its presence upon arrival in the uterus, a process known as maternal recognition of pregnancy. The conceptus derived signal(s) prevent(s) the structural and functional demise of the corpus luteum to ensure the maintenance of a uterine ...
Waddell B J - - 2000
The 11beta-hydroxysteroid dehydrogenase type 1 (11beta-HSD-1) enzyme catalyses the conversion of the biologically inert glucocorticoid 11-dehydrocorticosterone to active corticosterone (11-oxoreductase activity) in vivo, and it is dramatically up-regulated in uterine myometrium in the days leading up to parturition. 11beta-HSD-1 is likely to enhance local concentrations of glucocorticoid within the myometrium ...
Demmers K J - - 2000
The role of interferon in early pregnancy in red deer was investigated by (a) measuring production of interferon by the conceptus, (b) testing the anti-luteolytic effect of recombinant interferon-tau in non-pregnant hinds, and (c) treatment of hinds with interferon after asynchronous embryo transfer. Blastocysts were collected from 34 hinds by ...
López-Sáez A - - 2000
This study examined the effects of three diluents--skim milk (M), TesT (TE) and Tris-trehalose (TR)--on quality of ram semen stored at 5 degrees C over a long term. Percentage of motile spermatozoa (PM), motility score (MS), percentage of intact acrosomes (PIA), and percentage of swollen spermatozoa under hypoosmotic conditions (PS) ...
Vis A N - - 2000
Application of immunohistochemistry to assess the presence of prognostic tissue markers is used widely. The quantitation of these markers may be hampered by a time-related loss of antigenicity in formalin-fixed paraffin-embedded tissue stored on glass slides. Potential loss of immunohistochemical staining intensity was studied on prostatic needle biopsy sections stored ...
Takiguchi S - - 2000
The superoxide radical and its scavenger, superoxide dismutase (SOD), play important roles in the regulation of corpus luteum function. The present study was undertaken to investigate whether SOD is related to pregnancy-induced maintenance of corpus luteum function. Placentae obtained from rats on Day 12 of pregnancy were incubated for 24 ...
Adu E K - - 2000
The efficacy of the detection of vaginal plug formation after mating for pregnancy diagnosis, and the degree of embryonic resorption were studied in 67 wild greater cane rats (Thryonomys swinderianus) at Esiam in the Ekumfi District, Ghana, over a period of 3 months. Vaginal plug formation was first observed on ...
Yue Z P - - 2000
This study examines immunohistochemically the presence of EGF, TGFalpha, HB-EGF, AR, and EGFR, members of the EGF family in the monkey uterus during the menstrual cycle and early pregnancy. EGF, TGFalpha, HB-EGF, AR, and EGFR were mainly localized in glandular and luminal epithelium. TGFalpha, HB-EGF, and AR staining were stronger ...
Renfree M B - - 2000
Pregnancy in kangaroos and wallabies (macropodid marsupials) induces multiple unilateral responses in the reproductive system that override those related to proximity to the single corpus luteum on one ovary or to the follicle on the contralateral ovary. This situation is in contrast to most other non-macropodid marsupials, in which the ...
Sugino N - - 2000
To investigate the possible role of the superoxide radical and its scavenging system in the human corpus luteum, superoxide dismutase (SOD) values and lipid peroxide concentrations were analysed in the corpora lutea during the menstrual cycle and in early pregnancy. Copper-zinc SOD (Cu,Zn-SOD) activities increased from the early to mid-luteal ...
Gerstenberg C - - 2000
Branched tubular endometrial glands are key features of the uterine lining in mares. The epithelium in the neck regions of the glands is similar to that lining the lumen of the uterus, whereas the epithelium in the deeper, coiled portions of the glands secretes protein rich histotrophe or 'uterine milk' ...
Lenhart J A - - 1999
Connexin (CX) proteins participate in growth, differentiation, and tissue remodeling. Relaxin-stimulated reproductive tissue growth and remodeling may be facilitated by enhanced intracellular communication. This study was an examination of the effects of relaxin in vivo on expression of CX-26, CX-32, and CX-43 in the cervix and uterus of prepubertal pigs. ...
Athanassakis I - - 1999
The detection of corticotropin-releasing hormone (CRH) in the pregnant and non-pregnant uterus has driven research to determine the role of this 41 amino acid neuropeptide in the female reproductive system. As concentrations of CRH mRNA and its peptide product are greater in the implantation sites of the early pregnant uterus ...
Vonnahme K A - - 1999
Porcine conceptuses rapidly elongate within the uterine horns prior to the period of placental attachment. During the time of elongation, secretion of estrogen by the developing conceptuses occurs for the establishment of pregnancy through maintenance of corpora lutea and facilitation of placental attachment. Factors associated with the uterine luminal epithelium ...
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