Search results for "sperm"

Hormonal and molecular characterization of follicular fluid, cumulus cells and oocytes from pre-ovulatory follicles in stimulated and unstimulated cy…

2012

background: The use of ovarian stimulation, to stimulate a multi-follicular response for assisted reproduction treatments, may force the production of oocytes from follicles that do not reach optimal maturation, possibly yielding oocytes that are not fully competent. The present study aimed to define the follicular environment and oocyte competence of unstimulated pre-ovulatory follicles, to compare it with that of similar-sized stimulated follicles. For this purpose, we analyzed the follicular hormonal milieu, the oocyte meiotic spindle, the embryo development and the cumulus cells gene expression (GE) profiles. methods and results: The study population was divided in two groups: (i) 42 oo…

Antral follicle count (AFC) can be used in the prediction of ovarian response but cannot predict the oocyte/embryo quality or the in vitro fertilizat…

2007

To verify whether the antral follicle count (AFC) could predict ovarian response, oocyte/embryo quality, and IVF outcome.Prospective study.Instituto Universitario-Instituto Valenciano de Infertilidad, Valencia, Spain.One thousand seventy-four donors and 975 oocyte recipient cycles.Controlled ovarian hyperstimulation (COH), endometrial preparation, IVF/intracytoplasmic sperm injection, ET.COH and oocyte/embryo quality parameters and IVF outcome.We observed lower E(2) levels and fewer mature retrieved oocyte numbers among donors who showed an AFC that was10. These donors also showed significantly higher cancellation and no-donation rates; poor and/or insufficient response was the principal ca…

A high oocyte yield for intracytoplasmic sperm injection treatment is associated with an increased chromosome error rate.

2009

Objective To compare the chromosome error rate among oocytes from stimulated ovaries after retrieval of 1–5 oocytes, 6–10 oocytes, and >10 oocytes. Design Retrospective cohort study. Setting A university-based human genetic institute in collaboration with a private fertility center. Patient(s) Nine hundred thirty-three women undergoing intracytoplasmic sperm injection (ICSI) with a poor prognosis. Intervention(s) Oocyte collection with ovarian stimulation. Polar body testing of ICSI oocytes for common chromosome errors. Main Outcome Measure(s) Chromosome error rate in oocytes, as determined by five-color fluorescence in situ hybridization. Result(s) In women less than 35 years and women bet…

Sensitive and selective plasmonic assay for spermine as biomarker in human urine.

2014

A simple, fast, and highly selective and sensitive colorimetric assay to detect nanomolar levels of spermine in human urine (healthy donors, cancer patients) is reported. This assay is based on the absence of a competitive organic capping on the gold nanoparticles together with the high affinity of the amine groups of the analyte for the nanoparticle surface.

Data from: Parallel diversifications of Cremastosperma and Mosannona (Annonaceae), tropical rainforest trees tracking Neogene upheaval of South Ameri…

2017

Much of the immense present day biological diversity of Neotropical rainforests originated from the Miocene onwards, a period of geological and ecological upheaval in South America. We assess the impact of the Andean orogeny, drainage of lake Pebas, and closure of the Panama Isthmus on two clades of tropical trees (Cremastosperma, c. 31 spp.; and Mosannona, c. 14 spp.; both Annonaceae). Phylogenetic inference revealed similar patterns of geographically restricted clades and molecular dating showed diversifications in the different areas occurred in parallel, with timing consistent with Andean vicariance and Central American geodispersal. Ecological niche modelling approaches show phylogenet…

Cigarette Consumption and X-Sperm Enrichment After Swim-Up

2005

Erratum to “The Trumorph® system: The new universal technique for the observation and analysis of the morphology of living sperm” [Anim. Reprod. Sci.…

2015

Effect of environmental endocrine disruptor's exposure on sperm quality and aneuploidy rates in fertile sperm donors

2016

Sperm survival assay for toxicity evaluation in ultrasound gels and vaginal lubricants used in reproductive medicine

2016

Atypical functioning of female genitalia explains monandry in a butterfly

2021

Monandrous species are rare in nature, especially in animals where males transfer nutrients to females in the ejaculate. The proximate mechanisms responsible for monandry are poorly studied. In butterflies and moths, the male transfers a nutritious spermatophore into the corpus bursae (CB) of the female. The CB is a multifunctional organ that digests the spermatophore and has partial control of the post-mating sexual receptivity of the female. The spermatophore distends the CB and the post-mating sexual receptivity of the female is inversely proportional to the degree of distension. The CB of many butterfly species has a muscular sheath whose contractions mechanically contribute to digest t…