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Results 501 - 550 of 1019
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Hart D A - - 1999
Tendons such as the Achilles tendon are complex structures that are hypocellular, hypovascular, and hyponeural. The development of pathophysiologic function in this tendon because of overuse is relatively common; however, the mechanisms responsible for the development of paratenonitis and tendinosis remain primarily undefined. To understand better a possible regulatory role ...
Tilbury K L - - 1999
Pilot whales strand periodically along the U.S. coast, and these strandings offer an opportunity for the collection of tissues for biomonitoring of contaminant exposure in cetaceans, as well as for specimen archiving. Concentrations of organochlorine (OC) contaminants (e.g., PCB congeners, pesticides, DDTs) were measured in tissue samples from pilot whales ...
Martrenchar A - - 1999
1. The effect of stocking density on welfare traits of turkeys was studied in 2 experiments. In each experiment 2,633 sexed BUT turkey poults were assigned to 3 rooms, 135 m2 with 1 treatment per room. Because of the large flock size (675,878 and 1080 birds in T1, T2 and ...
Cargill S L - - 1999
Animals with extreme body growth frequently experience poor reproductive performance, but the cause for this association has not been clearly established. A line of mice homozygous for the high growth (hg) mutation, a mutation that has a major effect on post-weaning growth, exhibits several reproductive deficits including an abnormally high ...
Lee S M - - 1999
Androgens have been postulated to have a major role in testicular descent via regression of the cranial suspensory ligament, which in normal rodents anchors the ovary to the retroperitoneum near the lower pole of the kidney. This study aimed to quantitate the degree of descent of the foetal ovary in ...
Hamza-Chaffai A - - 1999
Cadmium, copper and zinc were determined concomitantly with metallothionein-like proteins (MTLPs) in the subcellular fractions of Ruditapes decussatus digestive gland. This study covered 4 months and aimed to evaluate the effect of metal pollution and other factors such as sex, size and reproductive state on MTLP levels. Copper concentrations did ...
Deveci E - - 1999
Dithiocarbamate propineb and maneb are organometal fungicides, which are widely used for the control of diseases in plants. Female Wistar rats were exposed orally to 200 and 400 ppm propineb (Zn-containing dithiocarbamate) and 250 ppm maneb (Mn-containing dithiocarbamate), from the 6th day of gestation up to birth. We found that ...
Brouette-Lahlou I - - 1999
The aim of the present study was to analyze the respective roles of main and accessory olfactory systems in a particular pattern of Wistar rat maternal behavior: specific licking of pup's anogenital areas, a behavioral pattern crucial to pup survival--nonlicked pups cannot defecate, and die. Dodecyl propionate (DP), a chemical ...
Skidmore J A - - 1999
Thirty female dromedary camels were inseminated on a total of 50 occasions with 2-4 ml of fresh guanaco semen diluted with an equal volume of commercially available camel semen extender. Similarly, nine female guanacos were inseminated on 34 occasions with 4-6 ml of fresh, diluted camel semen. Only two of ...
Drickamer L C - - 1999
Seven experiments were performed to investigate pregnancy termination, urinary chemosignals, and litter sex ratio variation in female house mice. Experiments tested the effects of urine from adult and prepubertal females, housed individually or in groups, on successful insemination and litter production by females treated at different times and for different ...
de Catanzaro D - - 1999
Previous research indicates a role of pheromones in novel male-induced early pregnancy disruptions. Although some reports suggest that urine alone is sufficient to produce this effect, others raise procedural concerns and fail to replicate such effects. On Days 1 to 5 after insemination, female CF-1 mice had their nasal regions ...
Abbott B D - - 1999
The aryl hydrocarbon receptor (AHR) is a transcriptional regulatory protein that binds to upstream DNA response elements of target genes. Activation of the AHR by binding of ligands such as polyhalogenated dioxins, furans, and PCBs is associated with a wide range of adverse biological outcomes, including cancer, immune deficiencies, embryo/fetotoxicity, ...
Robertson S A - - 1999
Granulocyte-macrophage colony-stimulating factor (GM-CSF) has been identified as a potentially important mediator of intercellular communication in the female reproductive tract, with principal target cells being the large populations of myeloid leukocytes in the cycling and pregnant uterus, the preimplantation embryo, and trophoblast cells of the developing placenta. To determine the ...
Gauthier C A - - 1999
Reproductive data are presented for female Papio papio housed in the Zoological Park of Paris and are compared with previously published data from free-ranging populations of other baboon species. The results indicate similar intermenstrual intervals and durations of sexual swelling. Sexual swelling and pregnancy are accelerated in captivity, while postpartum ...
Valeggia C R - - 1999
Titi monkeys (Callicebus spp., Cebidae) are monogamous neotropical primates that live in family-like groups typically consisting of an adult monogamous pair and one or two young. Knowledge about the reproductive biology of this genus is scanty. This study investigated the reproductive biology of female dusky titi monkeys (Callicebus moloch). An ...
Cooper R L - - 1999
Work in our laboratory has focused on the hypothesis that certain environmental contaminants will interfere with reproductive function because they disrupt the neuroendocrine regulation of gonadal function. In this article, we review the evidence that certain classes of contemporary-use pesticides alter gonadotropin secretion through a disruption of hypothalamic mechanisms. Specifically, ...
Denenberg V H - - 1999
In a recent report, a series of studies is described showing that individual differences in rat maternal licking and grooming are correlated with their offsprings' later adrenal response to a stressor (Liu et al., 1997). Pups that received more maternal stimulation in infancy had lower ACTH, corticosterone, and CRH mRNA, ...
Bonde J P - - 1999
The main objective of the Asclepios program was to examine occupational risk factors for the male reproductive system. The program focused on occupational exposure to fungicides (farmers, greenhouse workers, and vineyard workers), styrene (laminators in the reinforced plastics industry) and inorganic lead (battery workers, foundry workers, and lead smelters). Questionnaire ...
Aractingi S - - 1998
BACKGROUND: Polymorphic eruptions of pregnancy (PEP) are common cutaneous disorders of unknown origin that occur usually after week 34 of gestation. Since pregnancy is associated with peripheral-blood chimerism, particularly during the third trimester, we studied the role of fetal cells in the development of the skin lesions. METHODS: We studied ...
Chu J - - 1998
We investigated the effects of the neurohypophysial peptide, arginine vasotocin (AVT), on the calling behavior of male Acris crepitans during and immediately following a simulated acoustic agonistic encounter. AVT did not block the aggressive response to agonistic calls, as the changes in temporal call characteristics in response to the encounter ...
Hearon C M - - 1998
BACKGROUND: The standard anti-G suit (CSU-13B/P) was designed based on male body structure. Females differ from males with respect to body proportionality. In Armstrong Laboratory (AL) studies, females have terminated centrifuge simulated air combat maneuvers (SACM) because of anti-G suit (CSU-13B/P modified according to original T.O. 14P3-6-121)(OTO) discomfort. AL modifications ...
Normalina M - - 1998
Central serous choroidopathy is a spontaneous serous detachment of the sensory retina, usually affecting adults between 20 to 50 years of age but is also found in patients older than 60 years of age. This disease usually affects males with a male to female ratio of 8-10 to 1. Many ...
Neri M - - 1998
The sensitivity and specificity of the two forms of the CAMDEX interview for dementia diagnosis were assessed in a 1-year follow-up study. At the beginning of the study, 60 patients (22 males and 38 females) who met DSM-IV criteria for dementia and 60 matched controls (15 males and 45 females), ...
Swartz W J - - 1998
This study was designed to determine the ability of female mice who were exposed neonatally to the pesticide methoxychlor (MXC) to mate, ovulate, and become pregnant upon reaching sexual maturity. One-day-old female mice (5 to 8/group) were exposed daily by intraperitoneal (ip) injection for 14 d to either sesame oil ...
Pediaditakis N - - 1998
A mechanism of mate selection in humans is proposed and elaborated. It is further proposed that this mechanism constitutes one of the important factors for stability and the necessary longevity of the procreational dyad and therefore the procreational success of humans as a species. The concepts and mechanisms of assortative ...
Guven K - - 1998
Dithiocarbamate propineb and maneb are organometal fungicides, which are widely used for the control of diseases in plants. Female Wistar rats were exposed orally to 200 and 400 ppm propineb and 250 ppm maneb, from the sixth day of gestation up to birth. We found that the body weights of ...
Velloso A L - - 1998
This study used a fecal steroid monitoring technique to evaluate reproductive cycles in male (4) and female (15) maned wolves, endangered South American canids. A radiolabeled testosterone infusion on a male revealed a fast and predominantly fecal route of excretion for this steroid. Testosterone was also excreted as eight unidentified ...
Ueda H - - 1998
Female guinea pigs with synchronized ovulation by means of implantation of progesterone-filled tubing (P-tube) followed by a progesterone injection, were inseminated by intraperitoneal injection with sperm suspension. First, to obtain the optimum conditions for insemination, the females were inseminated singly over the range of 1-10 x 10(7) spermatozoa before and ...
Gobet R - - 1998
PURPOSE: Congenital hydronephrosis is more common in male individuals. We investigate whether an alteration in fetal bladder function induced by premature urachal closure contributes to fetal hydronephrosis, consequently explaining this male predominance. MATERIALS AND METHODS: The urachus was clipped in 8 male and 4 female ovine fetuses at 95 days ...
Keverne E B - - 1998
Pregnancy block in mice requires exposure of recently mated females to urinary pheromones of a strange male, and when working with inbred strains this invariably requires urine from an outbred line. The pheromones which induce oestrus and early puberty in mice have been identified as the brevicomins and dihydrothiazoles. Since ...
Lankas G R - - 1998
A subpopulation of the CF-1 mouse strain contains a spontaneous mutation in the P-glycoprotein (Pgp) mdr1a gene, which leads to a lack of mdr1a expression in the placenta as well as brain and intestine. Individual CF-1 mice can be identified according to their Pgp status by a restriction fragment length ...
Ohro Y - - 1998
This report describes a 46,XY phenotypic female infant with absent uterus, probable agonadism, and bilateral upper amelia. The constellation of anomalies is similar to that of the patient described by Temoçin et al. (Acta Paediatr Jpn 1997: 39: 631-633), and may suggest a developmental link between genital region and upper ...
Applewhite-Black L E - - 1998
In 1994, the Public Health Service made prenatal zidovudine (ZDV, AZT) the standard of care to prevent mother-to-child transmission of HIV. The current study was undertaken to determine if prenatal exposure to ZDV has an impact on pregnancy outcomes, birth anomalies, or offspring behavior in an animal model using Sprague-Dawley ...
Vazquez M D - - 1998
In the mouse, Sryis expressed by somatic cells in the genital ridge and leads to initiate the transformation of the indifferent gonad into a testis. Here, we have examined the segmented female and male mesonephroi over the developmental period when the initiation of seminiferous cord formation takes place. We have ...
Roberts R L - - 1998
Prairie voles (Microtus ochrogaster) are monogamous New World rodents which show geographic variation in social behavior. In this study, parameters of female reproduction which might be related to mating system were compared in prairie voles from eastern Kansas (KAN) versus central Illinois (ILL). KAN females showed a more rapid onset ...
Lockwood G M - - 1998
The activins and inhibins are glycoproteins that belong to the transforming growth factor-beta superfamily and, as such, have diverse effects at many stages during growth and development. Originally identified by their effects on follicle stimulating hormone in males and females, the recent development of specific and sensitive assays for this ...
Rosenblatt J S - - 1998
The aim of the study was to determine whether there is an increase in responsiveness to estrogen stimulation of maternal behavior and lordosis responsiveness during pregnancy. Using separate groups of pregnancy-terminated females, we measured the initial maternal responsiveness of hysterectomized-ovariectomized (HO) females and their responsiveness to estrogen stimulation. Maternal behavior ...
Moroi M - - 1998
To begin to dissect atherogenesis as a complex genetic disorder affected by genetic makeup and environment, we have (a) generated a reproducible mouse model of neointimal growth; (b) evaluated the effect of disruption of a single gene, endothelial nitric oxide synthase, believed to be central to intimal growth, and (c) ...
Coopersmith C B - - 1998
Pregnancy block, whereby recently mated female mice abort their pregnancies when exposed to novel (strange) males, was studied in house mice (Mus domesticus) differing in t-complex genotype; t-mutations are deleterious and +/t females avoid +/t males as mates. The results of Experiment 1, in which the genotype of the female, ...
Kaiser S - - 1998
This study investigated the influence of the social environment during pregnancy and lactation on the female offsprings' endocrine parameters and behaviour. The subjects studied were daughters whose mothers had either lived in a stable social environment (SSE) during pregnancy and lactation (SE-mothers) or in an unstable social environment (USE) during ...
Halberstadt-Freud H C - - 1998
The author discusses the arguments in favour of an Electra rather than an Oedipus complex to describe the vicissitudes of female development and explores the value of using a different paradigm. She concludes that girls do not have to change their primary object to become female. Pathological forms of the ...
Roberts J L - - 1998
We report on a woman with incontinentia pigmenti (IP), who had two successive term pregnancies. The first pregnancy ended in the birth of a male infant, who is alive and well at 2 years. A second liveborn male had early postnatal distress and died after 1 day of life, after ...
Lundy B - - 1998
Eighteen adolescents were videotaped during same-sex and opposite-sex interactions in the eleventh and twelfth grades. In both grades, females felt more comfortable during same-sex interactions than during opposite-sex interactions, and they rated their same-sex partners more positively than did males. Females in both grades and males in eleventh grade showed ...
Milrod B - - 1998
Unconscious pregnancy fantasies are outlined as an underlying dynamic organizer to the panic experience in some patients with panic disorder. Detailed case material from the treatment of two childless panic patients, one male and one female (nonpregnant) is presented to illustrate this. A literature review found reports of nine nonpregnant ...
Acharya K K - - 1997
Presence of the stud male prevents the novel male-induced block to early pregnancy in mice, while reexposure to the stud male after the pregnancy block induces pseudopregnancy in the females. These two phenomena involve luteotrophy in the female, and a (luteotrophic) memory of the stud male characteristics formed in her ...
Graham T E - - 1997
Adult common map turtles, Graptemys geographica (n = 243), were obtained in November 1995 from a hibernation site in the Lamoille River, Vermont. Of the 208 female turtles examined, 151 (72.6%) had at least 1 leech (Placobdella parasitica) attached and 10 of 35 males (28.6%) were similarly parasitized. Mean abundances ...
Thomas S A - - 1997
The roles of norepinephrine (NE) and epinephrine in behavior were investigated by targeted disruption of the dopamine beta-hydroxylase (Dbh) gene, thereby eliminating these compounds in vivo. Most heterozygous pups born to Dbh-/- females died within several days of birth and were often found scattered within the bedding. Potential causes including ...
Demas G E - - 1997
Exposure to an unfamiliar male conspecific results in pregnancy interruption (i.e., the Bruce effect) in rodents. Unlike most laboratory rodents, female prairie voles (Microtus ochrogaster) are induced into estrus by chemosensory stimuli contained in the urine of male conspecifics while grooming the anogenital (A-G) region of unfamiliar males. Female prairie ...
Marchlewska-Koj A - - 1997
Social stress, which is a part of the interaction between animals, can be defined as the set of physical stresses caused specifically by the presence and actions of certain conspecifics. Dense populations are characterized by considerably increased intermale and interfemale aggressive behavior. This establishes a hierarchy which influences reproduction of ...
Nagasawa H - - 1997
The characteristics of GR/A mice are rather poor pup growth and vigorous activity associated with increased excretion of taurine during pregnancy and lactation. The relationship between taurine and these characteristics were studied. The group of GR/A mice given a 1% taurine solution in their drinking water on the first day ...
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