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Results for “Fertile Period”

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At least 55 records · Page 3Linked to original sources
PubMed2003

Marked depression of time interval between fertilization period and hatching period following exposure to low-dose X-rays in zebrafish.

In recent years there has been growing concern over the stimulating effects of very low-dose X-rays. Our laboratory had observed that zebrafish irradiated with low-dose X-rays tended to emerge earlier than sham controls. This observation led us to quantitatively examine the effects of low-dose X irradiation on a series of stages of development in the zebrafish. The embryos were fertilized simultaneously in vitro and incubated at an optimal temperature without crowding. Following exposure of the cleavage period (1.5 h after fertilization) to 0.025-Gy X-rays, the duration to hatching was slightly shorter than that of the sham controls. This tendency was increased when the X-ray exposure occurred during the blastula period (3.5 h). In these embryos, the duration to hatching decreased significantly by an average of 6 h sooner than for sham controls. No differences in duration to hatching were seen when irradiation was given during either the zygote period (45 min) or the segmentation period (12 h). On the contrary, upon exposure to 0.5-Gy X-rays during the blastula period, the duration to hatching increased significantly relative to that of sham controls. These results suggest that the radiation-induced early hatching effect is observed for low doses of X-rays.

Animals↗
PubMed1984

Determination of cytomegalovirus antibodies by enzyme-linked immunosorbent assay (ELISA) in women of fertile period.

Such cytomegalovirus antibodies as the IgG and IgM are investigated in the present work. Investigation was carried out on 301 sera of fertile aged women (between 18 to 35 years of age) under the enzyme-linked immunosorbent assay (ELISA). Only one dilution has been made i.e. 1:40 and the final dilution was worked out from regression graph obtained from a previously titred human positive serum analysis; IgG antibodies were found in 265 cases (88%), appearing IgM antibodies in 4 of them, with the remaining 36 cases showing neither IgG nor IgM antibodies (12%). These results were compared with those obtained in other countries and the importance of the serological diagnosis to this virus was pointed out.

Adolescent↗
PubMed1992

[Determination of the fertile period during the menstrual cycle in women by monitoring changes in crystallization of saliva with the PC2000 IMPCON minimicroscope].

The authors tested the possibility of assessment of fertile and infertile days during the menstrual cycle by investigating the crystallization of saliva by means of a minimicroscope PC 2000 IMPCON. They followed up for five months a total of 58 women where they assessed by a combination of at least three classical examination methods ovulatory and anovulatory cycles. They monitored a total of 120 cycles and examined 1649 specimens of saliva. Some women had to be eliminated on account of virosis during a flu epidemic (a total of 11 cycles). During the periovulatory period the authors recorded in ovulatory cycles the foreseen crystalline structures in saliva in 78.57%. In anovulatory cycles agreement between the expected character of the saliva specimen and anovulation was found in 84% of the examined cycles. In addition to structures suggesting fertile or infertile days, the authors identified also intermediary types. In the discussion the authors analyze various aspects as regards evaluation of the correlation between salivary and serum levels of gonadotropins and ovarian steroids. They evaluate physical and chemical changes of saliva and vaginal secretion and discuss the problem of crystallization of the saliva during the menstrual cycle. Based on their findings, when testing the minimicroscope PC 2000, they supplement the list of factors with influence the results of examinations. They consider PC 2000 a suitable modern equipment which extends the range of contraceptives and at the same time helps to assess the optimal time for conception in planned pregnancies.

Adolescent↗
PubMed2006

Relationship between the fertile period and sperm transport in the bitch.

Following ejaculation into the vagina, dog sperm remain functionally competent for many days, acquire the ability to fertilize, and are delivered to an appropriate site within the uterine tube synchronously with the appearance of fertile oocytes. The mechanisms involved in regulating this system are complex, and allow for sperm storage within the female reproductive tract. The aim of this paper is to review current knowledge of the transportation of sperm and their biology within the reproductive tract of the bitch.

Animals↗
PubMed1977

[The length of the fertility period of the rat spermatozoa].

4-day cyclic Wistar female rats were caged with sexually experiences males at either 18:00-19:00 on proestrus or at 21:30-22:30 during the following night. 16 out of 17 bulbectomized females and 16 out of 40 intact females respectively mated at 18:00-1900. 22 out of 24 intact females mated at 21:30-22:30. Only 11 out of the 32 receptive females became pregnant in the first group while 14 out of the 22 receptive females went into pregnancy in the second group. It is then supposed, given that ovulation does not take place before midnight during the night from proestrus to estrus in the rat that the fertilizing capacity of spermatozoon is of relatively short duration in the rat.

Animals↗
PubMed1980

Temporal relationships between ovulation and defined changes in the concentration of plasma estradiol-17 beta, luteinizing hormone, follicle-stimulating hormone, and progesterone. I. Probit analysis. World Health Organization, Task Force on Methods for the Determination of the Fertile Period, Special Programme of Research, Development and Research Training in Human Reproduction.

One hundred seventy-seven women have been studied over the periovulatory period, in order to obtain detailed information on temporal relationships between ovulation and defined changes in the concentrations of estradiol-17 beta (E2), luteinizing hormone (LH), follicle-stimulating hormone (FSH), and progesterone (P) in peripheral plasma. Serial samples of blood were taken, the surfaces of the ovaries were examined at laparotomy, and the mature follicle or corpus luteum was removed for histologic examination. The results in 107 cases fulfilled the criteria for statistical analysis, and in 78 the operation was performed after the follicle had ruptured. A probit analysis was undertaken with use of the proportion of women who had ovulated at a given time in relation to the interval from a defined rise or peak in the concentration of a circulating hormone. The median time intervals (in hours) from the hormonal event to ovulation and the 95% confidence limits of the estimates are as follows: 17 beta-estradiol--rise 82.5 (54.0 to 100.5), peak 24.0 (16.9 to 32.1); LH--rise 32.0 (23.6 to 38.2), peak 16.5 (9.5 to 23.0); FSH--rise 21.1 (14.1 to 30.9), peak 15.3 (8.1 to 21.7); progesterone--rise 7.8 (-12.5 to 15.9). From the statistical model for LH it was possible to estimate that ovulation in 90% of the cases had occurred between 16 (+/- 6) and 48 (+/- 6) hours after the first significant rise in the concentration of this hormone and between -3 (+/- 5) and 36 (+/- 5) hours after the peak. An examination of the individual results in every woman gave corresponding ranges of between 24 and 56 hours from the first significant rise in LH and between 8 and 40 hours after the peak. From a practical standpoint, the conclusion is that a defined rise in the concentration of circulating LH is the best indirect parameter of impending ovulation.

Adult↗
PubMed1987

The prediction of ovulation and monitoring of the fertile period.

Simple and reliable methods have been sought for both predicting and confirming ovulation. Application of these methods could include management of infertile couples to aid in conception and for increasing the reliability of natural family planning (NFP) as a method of birth control. With the advent of specific hormone assays, serial measurements of estrogens, progesterone (and metabolites), and luteinizing hormone have been the gold standard of monitoring ovarian function in women. However, newer and simpler methodologies have been described and are currently either in use or being tested. These include the measurement of basal body temperature (BBT), the evaluation of the volume, consistency and electro-conductivity of cervicovaginal fluid, salivary steroid content and cellular enzymatic activity, the use of enzyme-linked immunosorbent assays applied to solid-phase formats, and the investigation of new hormonal molecules as markers of reproductive state and function. These new technologies are described herein and their potential for monitoring ovarian function is discussed.

Body Temperature↗