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Results for “Reproductive Period”

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At least 253 records · Page 14Linked to original sources

PubMedDate not supplied

Uterine liposarcoma in a young woman: a case report.

Liposarcoma of uterus is a very rare neoplasm encountered generally in the sixth or seventh decade of life. We reported the eighth case of uterine liposarcoma with extension to broad ligament in a 23-year-old woman who presented with pelvic pain, dysuria, and rapidly enlarging pelvic mass. During laparotomy, the mass was detected to be originated from the uterine cervix. In frozen section, no definitive diagnosis was established, and for preservation of fertility, extirpation of the mass was performed. The histopathologic examination of the specimen revealed liposarcoma. The tumor cells were diffusely and intensively immune reactive for vimentin and S-100, and negative for smooth muscle actin, desmin, h-caldesmon, pan cytokeratin, and CD10. Staining with periodic acid and Schiff, alcian blue, mucicarmine, and epithelial membrane antigen (EMA) were negative. No recurrence was detected in the postoperative seventh month. Present case is the youngest patient with uterine liposarcoma and also the first case detected in reproductive period.

Adult↗

PubMed1990

[The genetic-demographic approach in anthropological research. VII. The influence of the social environment on the indices of the reproductive function in Khakass women].

The biodemographic parameters showing the influence of social factors upon the different elements of population and family structure are considered. It has been shown that the semi-generation time interval which corresponds to the duration of the active reproductive period of the generation is worth using to reveal the mechanisms of the social adaptation of the population. It has been found that socially determined differential fertility of families and genetically determined mortality in perinatal period are now the main components of the potential selection (index Crow).

Adult↗

PubMed1989

Dynamics of egg production of the cestode Diphyllobothrium dendriticum (Nitzsch, 1824) (Cestoda: Pseudophyllidea) and the concept of fecundity in helminths.

The dynamics of egg production of the tapeworm D. dendriticum has been estimated experimentally in nestlings of the herring gull Larus argentatus per day and per reproductive period. Numbers of eggs in strobilae have been estimated for the maturation period. Mean egg production, of one tapeworm per day (10.42 +/- 2.72 mln) is two orders of magnitude as high as the maximal number of eggs in a mature strobila (0.206 +/- 0.007). It is proposed to estimate the coefficient of reproduction intensity as the ratio of egg output per unit of time and maximum egg numbers in a mature strobila.

Animals↗

PubMedDate not supplied

[Mexico: reproductive behavior and social margination, 1970-1990. Elements of geographic diagnosis in reproductive health].

The lack of a definite knowledge on regional reproductive behavior characteristics hinders the evaluation of the goals stated in the General Population Law (Ley General de Población) and counteracts any efforts towards equating population growth with regional development. The present work aims at overcoming this problem. Indirect specific fertility rates and global fertility rates (GFR) were obtained by state, using census and vital statistics data for the states of Mexico during the 1970-1990 period. Reproductive behavior was related to social deprivation indexes used by PRONASOL and CONAPO for those years. A high statistically significant correlation (p < 0.01) between state social deprivation levels and the downward trends of GFR for the same decades was found. Findings evidence a general downward trend of GFR during the period of study. However, this trend was not uniform across the country. Further studies are needed to determine whether these differences are due to the various social deprivation levels rather than to the effectiveness and extension of family planning programs. Mapping these results could be useful as diagnostic elements of the reproductive behavior of the population and also generates information necessary to support social organized responses in reproductive health.

Adult↗

PubMed2006

New developments in children's environmental health in Europe.

Important developments have taken place in Europe regarding children's environmental health (CEH) over the last few years. In 1999 the Third Ministerial Conference on Environment and Health identified CEH as a priority area and started a process of scientific review and policy development that culminated at the Fourth Ministerial Conference held in Budapest in June 2004 with the adoption of the Children's Environment and Health Action Plan for Europe (CEHAPE). The rationale of the CEHAPE is based on a thorough review of the scientific evidence on CEH and on a study that quantified for the first time the burden of disease related to the main environmental exposures of children and adolescents in Europe. The Action Plan suggests actions and policies to achieve the four main priority goals: clean air, safe water, chemical and physical agents, and injuries. Over the same period, the European Commission (EC) has strengthened its focus on environment and health issues, has supported research on CEH, and has developed a proposal for a new EU regulatory framework for chemicals that has clear implications for children and for the reproductive period. The proposed new system, called REACH (Registration, Evaluation, and Authorization of Chemicals), currently under examination by the European Parliament, aims at reducing risks to human health and improvement of environmental quality through the better and earlier identification of the properties of chemical substances. The EC also adopted policies and action plans that are very relevant to children, such as the EU European Environment and Health Strategy, referred to as the SCALE initiative (Science, Children, Awareness, Legislation, Evaluation), and the 2004-2010 Environment and Health Action Plan.

Child↗

PubMedDate not supplied

[Features of the life cycles of Pterostichus montanus (Motschulsky, 1844) and Carabus loschnikovi (Fischer-Waldheim, 1822) (Coleoptera, Carabidae) in conditions of the mountain taiga belt in the Eastern Sayan].

We studied the seasonal dynamics and demographic structure of abundant ground beetle species from the mountain taiga belt in the Eastern Sayan. Data on the dynamics of the sexual and age structure of the populations as well as on the reproductive capacity of females in the biotopes on the slopes with different exposure and height were obtained. Life cycles with one- and two-year development were revealed for the ground beetles typical for the mountain taiga belt. As an example, data on the life cycles of Pterostichus montanus (Motschulsky, 1844) with one-year spring development and Carabus loschnikovi (Fischer-Waldheim, 1822) with two-year polyvariant multiseasonal development are given for the first time. Two strategies were revealed in the life cycles of ground beetles under alpine conditions: an accelerated population development in spring one-year species and a two-year development with pronounced polyvariance in two intrapopulation groups of ground beetles of the Carabus genus. The seasonal dynamics of the activity and reproduction periods proved to vary for these species on the slopes along the height gradient.

Adaptation, Physiological↗

PubMed2000

Anticipation of oxidative damage decelerates aging in virgin female medflies: hypothesis tested by statistical modeling.

Empirical analysis of survival data obtained from large samples of Mediterranean fruit flies shows that the trajectory of the mortality rate for virgin females departs from that for females maintained in mixed sex cages. It increases, decelerates, reaches its maximum, declines and then increases again within the reproductive interval. Non-virgin females, however, display an early-age plateau instead of this dip. We assume that these deviations are produced by the interplay between changes in oxygen consumption associated with reproductive behavior and the antioxidant defense that acts against anticipated oxidative damage caused by reproduction. Since there are no data on antioxidant mechanisms in medflies available that explain the observed patterns of mortality, we develop a model of physiological aging based on oxidative stress theory, which describes age-related changes in oxygen consumption and in antioxidative capacity during the reproductive period. Using this model, we simulate virtual populations of 25,000 virgin and non-virgin flies, calculate the respective mortality rates and show that they practically coincide with those of experimental populations. We show that the hypothesis about the biological support of reproduction used in our model does not contradict experimental data. The model explains how the early-age dip and plateau might arise in the mortality rates of female medflies and why the male mortality pattern does not exhibit such deviations.

Aging↗

PubMedDate not supplied

[Effect of Sr-90 on the reproductive function of rats after chronic exposure].

In experiments on white rats following long-term 90Sr exposure within a wide dose-range the effect of 90Sr on reproductive function of animals has been observed both over the entire reproductive period and in seven subsequent generations. It has been established that the ovule fertilization and the intrauterine fetus development did not differ from these values in control animals. However in some cases the loss of progeny was significant following the isolation of animals from parents. The physical development of rats in suckling period and sex proportion did not differ from the control progeny.

Animals↗

PubMedDate not supplied

Batflies parasitic on some phyllostomid bats in southeastern Brazil: parasitism rates and host-parasite relationships.

Ectoparasitic batflies were studied on 12 species of phyllostomid bats, by making 35 nightly collections of bats using mist nets at the "Panga" Ecological Reservation near Uberlândia, State of Minas Gerais, southeastern Brazil, from August 1989 to July 1990. Eleven species of Streblidae and one of Nycteribiidae were collected on 12 species of bats. Prevalence of ectoparasitic flies was lower than those reported by other authors for the New World and may be the result of the lack of caves in the study area, causing bats to roost in less favorable locations, forming smaller colonies. The fly, Trichobius joblingi Wenzel, was found on Carollia perspicillata (Linnaeus), showing preference for adult male bats. This could be explained by the predominance of males in the bat colonies, and by the fact that females rest in isolation during the reproductive period making them less exposed to the parasites. The streblid flies, Aspidoptera falcata Wenzel and Megistopoda proxima (Séguy), were found on Sturnira lilium (Geoffroy). A. falcata occurred mainly on young and adult females, whereas M. proxima did not show any preferences relative to the reproductive condition of the host. Ecological factors are important in determining differential numbers of parasites occurring on the different sexes, ages and reproductive state of the hosts.

Age Factors↗

PubMed1992

[Role of imbalance of sex hormones and gonadotropins in the development and course of essential hypertension in women].

Overall 146 females suffering from essential hypertension (borderline, stage I and II according to WHO, 1980) were examined for basal concentrations of estradiol, estriol, progesterone, testosterone, cortisol, ACTH, prolactin in plasma, LH and FSH in blood and urine. The patients and 69 control normotensive females were reproductive, premenopausal, menopausal, postmenopausal, postcastration. Latent hypertension was elicited at bicycle exercise. It was found that relationships between sex hormones and gonadotropins both in hypertensive and normotensive women did not differ noticeably in reproductive period and in menopause. Hormone defects due to primary and secondary infertility, castration, menopause did not raise the risk of arterial hypertension onset. An-Unfavorable course of hypertension was observed in premenopause, following operative castration, in climacteric syndrome. The severity of AH at reproductive age was associated with hyposecretion of progesterone, estrogens and gonadotropins LH, FSH. This relationship was absent in menopausal women. A conclusion is proposed on miner significance of sex hormones imbalance and gonadotropins in the onset of arterial hypertension in females varying by generative activity.

Adrenocorticotropic Hormone↗

PubMed2003

Reproductive output in the hatchery-reared california sea hare at different stocking densities.

Although the California sea hare (Aplysia californica) is well known from neurobiological studies and is raised in the laboratory for this purpose, the life history of this species in the laboratory is less well studied. Therefore we conducted a study of the reproductive period of hatchery-born and -raised A. californica in which sibling animals were reared at stocking densities of 2, 5, 10, 15, and 20 animals per 16-liter cage. Temperature was controlled at 13 to 15 degrees, and the photoperiod was a 14:10-h light:dark cycle. Seawater O2 concentration, pH, and salinity were optimized by seawater flow through the animal cages. Compared with scheduled feedings, an ad libitum algal diet produced early sexual maturity. Despite different growth rates at different animal densities per cage, the age at first sexual maturity (defined as the first egg mass) did not differ significantly among the different densities and averaged 210 +/- 15 days of age. Although there was no difference in the total spawn weight per cage as a function of animal density from 2 to 20 animals per cage, the number of spawning episodes per animal decreased as the cage density increased. The average weight of spawn per animal over its reproductive lifetime decreased as cage density increased. When expressed per day of reproductive maturity, spawn weight per animal decreased as the cage density increased. Finally, larger animals produced more eggs during the 10 spawns at the peak of the spawning period. The largest animals corresponded to the cages containing the fewest animals. Stocking densities between 2 and 20 per cage had little influence on time to maturity and on average number of days of reproductive life. However, stocking density (and thus animal size) strongly influenced so-called lifetime fecundity.

Animal Husbandry↗

PubMed2007

Genetic structure and reproductive strategy of the ant Cardiocondyla elegans: strictly monogynous nests invaded by unrelated sexuals.

Cardiocondyla elegans is a Mediterranean ant that nests on river banks. It rears only wingless (ergatoid) males that live peacefully in the same nest as opposed to other species of the same genus, which have both peaceful, winged and mutually aggressive 'ergatoid' males. Using microsatellite analysis, we investigated the genetic structure of 21 colonies from three different locations as well as the parentage of sexuals of two colonies of C. elegans. We show that C. elegans is strictly monogynous, and that its nests can contain foreign sexuals. The presence of alien sexuals inside ant nests is described for the first time and probably counteracts inbreeding resulting from matings between siblings. In the laboratory, aggression tests showed that workers only allow alien males to enter their nests, while all winged female sexuals attempting to enter were attacked. Nevertheless, the presence of alien female sexuals in nests in the field seems to result from active carrying behaviour by workers during the reproductive period.

Animals↗

PubMed1992

[Gender and health in Brazil: considerations based on the National Household Sampling Survey].

As in the principal industrial countries, Brazilian women have lived longer than men. However, paradoxically, women present higher morbidity indicators than men. Knowledge of the Brazilian pattern regarding this matter could be a useful contribution to an understanding of their determinants in our specific reality, as well as enabling us to foresee future trends that would make it possible to plan adjustment in the health system. A morbidity study based on data from the National Household Sample Survey (PNAD/IBGE), was undertaken in ten Brazilian states in 1986 with this in view. Coefficients of the prevalence of perceived morbidity, demand for and utilization of health services according to sex, standardized by age and using the direct method, were built up. As a measurement of the differentials, sex ratios were calculated. The excess of perceived morbidity in women was constant in all the regions. The sex differential in the utilization of health services showed regional variations, suggesting a relationship with the health services supply. Sex differentials were not observed in childhood; the highest values were found during the woman's reproductive period, decreasing sharply after 60 years of age. The pattern is very similar in all regions. In the present study, the findings could be partially explained by the methodology adopted, but they are similar to the findings reported in other countries. The intense transformations in the reproductive pattern and in the social status of Brazilian women probably have a considerable impact on the health status and on the recourse to health services, not as yet evaluated.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗

PubMed1982

Maternal age and lifespan do not influence longevity in the rotifer Asplanchna brightwelli.

An analysis of the mean lifespans among the progeny of the viviparous rotifer Asplanchna brightwelli produced during four generations has revealed that longevity of the offspring is not affected by maternal age of the parent or by the parent's lifespan. The production of viable offspring at any time during the parent's reproductive period may be of importance in assuring the continuity of clones of this short-lived rotifer species.

Animals↗

PubMed1980

Immunobiological and pharmacological properties of thymus factor X (TFX). I. Biological and pharmacological activity.

Detailed investigations on pharmacological properties of biologically active thymus extract were performed. Its acute and chronic toxicity was determined. Influence on the circulatory and the respiratory systems as well as on the parenchymatous and the smooth muscle organs, development of fetuses and reproductive functions were evaluated. Preparation TFX proved to be well tolerated and its acute action was manifested only at high doses injected intravenously. Its effect on the smooth muscle organs and its teratogenic activity were determined in the long-term experiments. It was assumed that it can be introduced in clinical use excluding women in the reproductive period.

Abnormalities, Drug-Induced↗

PubMed1982

Secular changes in age-specific cause of death in Sanday, Orkney Islands.

The purpose of this study is to describe secular trends in mortality for Sanday, Orkney Islands, Scotland between 1855 and 1974. Using information from death records, standardized crude mortality rates for each 10-year period were decomposed into 12 cause specific mortality rates. Differential contribution of each cause of death to the overall decrease in crude and age specific rates has been determined by comparing rates between periods of highest and lowest mortality. Although the decrease in rates was greater for females than for males, for both sexes, decreased mortality associated with respiratory diseases made the greatest contribution to the overall mortality decline. The decrease in death rates has its greatest effect during the reproductive period. Although results differ from those reported for England and Wales in the nineteenth century, they conform to estimates based on cross-national data from the mid-nineteenth century to the present.

Age Factors↗

PubMed1999

Energetics of offspring production: a comparison of a marsupial (Monodelphis domestica) and a eutherian (Mesocricetus auratus).

This study compares the energetic cost of reproduction during gestation and lactation of a eutherian, the golden hamster (Mesocricetus auratus), and a similar-sized (60,120 g) marsupial, the gray short-tailed opossum (Monodelphis domestica). Food consumption was monitored in 20 reproductively active (RA) opossums and 16 RA hamsters from conception to weaning at equivalent intervals in 19 non-reproductive (NR) opossums and 21 NR hamsters, all maintained within their zone of thermoneutrality (30 degrees C). Total energy assimilated from conception to weaning [opossums: 1261.3 +/- 28.0 Kcal (1 Kcal = 4.1868 J) and hamsters: 1647.5 +/- 60.6 Kcal] was positively correlated with litter size and mass per young in both species. Maternal mass-specific assimilated energy was significantly greater in hamsters than in opossums during gestation (P < 0.001), but not during lactation or from conception to weaning (P > 0.05). Efficiency of offspring production (energy stored in young/incremental energy in RA females) was higher in hamsters than in opossums and, in both species, it was higher during lactation than in gestation. The energetic cost of reproduction (per young per day) was higher in hamsters than in opossums. The marsupial mode of reproduction, as seen in opossums, yields young at lower cost but requires a longer reproductive period than is the case for a similar-sized eutherian.

Animals↗

PubMed1997

The Baigas of Madhya Pradesh: a demographic study.

This paper outlines the demographic characteristics of the Baiga tribe, one of the most primitive of the aboriginal tribal groups of Central India. The Baiga population has grown steadily since the first anthropological study of the tribe in the 1930s. Age at menarche, age at marriage, breast-feeding, and time interval between marriage and first conception are natural. There are more females than males. Sub-tribe endogamy is common; consanguineous marriage is favoured (34% of marriages are between first cousins) and marital distance is low (mean 7.1 km). Though the mean menarcheal age is high (15.2 years), mean age at first marriage is low (16.6 years), giving a long reproductive period.

Adolescent↗