Articles tagged with Sexual Reproduction
A recent meta-analysis published in Human Reproduction Update reveals a significant worldwide decline in sperm counts of over 50% in the past 46 years. The study also shows an accelerated post-2000 decline in sperm counts globally.
Researchers at Nagoya University discovered that grass puffer fish use a non-toxic version of their deadly toxin, TDT, to attract mates and warn off predators. The study found that TDT serves as an odorant, activating specific olfactory sensory cells in the fish's brain.
A study on Sordaria macrospora reveals a defect in the mitochondrial respiratory chain renders the fungus sterile, preventing it from forming mature fruiting bodies and sexual spores.
Researchers found evidence supporting a new theory on how chromosome recombination is regulated during sexual reproduction. By manipulating protein expressions in the model plant Arabidopsis thaliana, they discovered that boosting HEI10 levels significantly increased crossovers, while disrupting ZYP1 expression had a similar effect.
Researchers have discovered a family of selfish genes, wtf, that have survived for over 100 million years in yeast, contradicting established beliefs on their longevity. These 'killer meiotic drivers' transmit themselves to half of offspring and destroy reproductive cells without being suppressed by natural selection.
A recent study published in Acta Oncologica found that young women who have had cancer are at a higher risk of experiencing sexual problems, including loss of libido and intimacy issues. The study, which surveyed nearly 700 women, suggests that the type and intensity of cancer treatment can influence a patient's sex life.
A study by Nagoya University found that the quality of a thoroughbred's sire, not its broodmare's age, determines its racing success. The researchers analyzed data from over 15,000 horses and discovered that breeding older females with high-performing males resulted in lower win rates.
Researchers found that Gursky's spectral tarsier duets exhibit acoustic trade-offs in note rate and bandwidth, suggesting a relationship between physical fitness and vocal complexity. The study suggests that only physically fit individuals can easily produce broadband notes fast.
Researchers found that asexual whiptail lizards accumulate more harmful genetic mutations than their sexual counterparts due to relaxed natural selection. This study supports the theory that sex is more efficient at removing harmful mutations and maintaining genomic health.
Researchers examine the relationship between thermal biology and sexual selection, finding that animals often tolerate perilous temperatures during mating to increase reproductive success. The study highlights the importance of considering scale in understanding the impact of global warming on reproductive processes.
Researchers found that high temperatures induce epigenetic changes in zebrafish embryos, leading to sex reversal and altering the sex ratio. This study provides insights into the mechanisms behind climate change's impact on species with genotype-by-environment sex determination.
Male scorpionflies from two locations in Japan use varying mating tactics, with those from Okayama employing 'sneaking' to successfully mate. The study suggests that environmental factors and genetic components influence alternative mating habits.
A new study found that women over 40, non-Hispanic Black women, and those with lower education levels are more likely to experience infertility. The US fertility rate has plateaued, but access to healthcare services is a significant factor in preventing infertility.
A new combination of ulipristal acetate and meloxicam has emerged as a promising candidate for an on-demand contraceptive pill. The study found that the combination disrupted ovulation in 89% of women, with treatment cycles being around 3 days longer than baseline cycles.
In a study published in Social Science & Medicine, researchers found that young people in Uganda are turning to healers for their holistic approach to sexual and reproductive health. Healers provide a destigmatized, holistic SRH experience by embracing young people's sexual citizenship.
Research shows that asexual reproduction in stick insects, such as parthenogenesis, reduces genetic variability and slows down adaptation to environmental changes. This negatively impacts the speed of adaptation and genetic diversity in these insects.
A recent study reveals that parthenogenesis, a type of asexual reproduction, leads to a loss of efficiency in selecting beneficial mutations, reduced genetic diversity, and decreased heterozygosity in stick insects. This has significant implications for species' ability to adapt to changing environments.
A meta-analysis of 33 interventions targeting STI/HIV risk reduction found that including pleasure can improve knowledge and attitudes around sex, as well as condom use. The review suggests revisiting sexual education approaches that acknowledge the pleasurable aspects of human experience.
Researchers found that stressed worms produce more sexually attractive offspring by transferring small RNAs, which influence gene expression. This epigenetic inheritance allows the trait to persist across generations without DNA changes.
Researchers discovered a small fraction of diatom cells participate in sexual reproduction, while others block growth and reduce nutrient absorption. This phenomenon occurs in nutrient-rich conditions, representing a paradox for microalgae that usually compete for resources.
Researchers found that females who consumed less food for their entire lives lived longer but didn't reproduce as well as better-fed counterparts. However, those who switched to unlimited food after early life restriction started mating and reproducing more, producing three times more offspring than restricted diet flies.
A study published in Journal of Women's Health found that almost half of American Indian and Alaska Native women reported experiencing reproductive coercion in their lifetime. The research highlights the link between intimate partner violence, sexual violence, and poor reproductive health outcomes among this population.
Experts warn of a crisis in sex education due to the continued creation and endorsement of abstinence-only curricula. Comprehensive sex education is proven to promote sexual health among adolescents, but its delivery has declined over the last 25 years.
Researchers studied spider mite populations to understand evolutionary patterns of reproductive isolation, finding a positive relationship between genetic distance and isolation. The study supports the prevailing view of reproductive barrier evolution in diploid animals.
A new sex education program, Respecting the Circle of Life, has been shown to improve pregnancy prevention skills among Native American teens. The program, delivered through a summer basketball camp, significantly increased condom use self-efficacy, intention, and negotiation skills.
Researchers at Kyushu University successfully reconstitute the ovarian follicle from mouse stem cells, generating functional egg cells and growing viable mice. This breakthrough could lead to new treatments for infertility and help conserve endangered animals through egg cell production.
A new study has found that the absence of Aire protein in mice leads to fertility problems similar to those affecting men with autoimmune polyendocrine syndrome type I (APS-1). Researchers discovered that Aire-dependent central tolerance plays a critical role in maintaining male fertility.
A new study by University of Arizona researchers found that both multicellularity and sexual reproduction helped explain the rapid proliferation of animal, plant, and fungal species. The study suggests that multicellularity is actually more important than sexual production in driving diversity.
A study published in Pediatrics found that healthcare providers rarely discuss sexual health with adolescents, despite their importance for preventing unintended pregnancy and sexually transmitted infections. The researchers identified gaps between parent and adolescent perceptions of the need for these discussions.
Scientists identify edible wild mushroom with complex reproductive structure, challenging traditional understanding of fungal reproduction. The study reveals a new type of reproduction that recombines genetic information without a mate, potentially increasing ecological fitness and adapting to previously unsuitable habitats.
The Columbia University Mailman School of Public Health has established the Jennifer Schlecht Memorial Scholarship to support students pursuing careers in sexual and reproductive health. The scholarship aims to honor Jennifer's memory by providing travel stipends for field experience in fragile settings.
A nationally representative survey of US women identified four techniques to increase pleasure during vaginal penetration: Angling, Rocking, Shallowing, and Pairing. These techniques were previously unnamed in the literature, but provide language for women to communicate and advocate for their sexual pleasure.
A recent study in Nature Communications found evidence of recombination and genetic exchange in bdelloid rotifers, which were previously thought to be asexual. The discovery suggests that these organisms may not be as evolutionarily dead-end as once believed.
A study published in the Journal of Social and Personal Relationships found that people perceive potential partners as more attractive when they have a 'sexy mindset', which also reduces concerns about rejection. The researchers discovered that this bias motivates individuals to take a leap of faith and initiate relationships.
A new study finds that early age-appropriate discussions about safe sex lead to fewer unintended pregnancies and better long-term sexual health. Black male teens who had their first sex before age 13 reported more negative behaviors and poorer relationship quality with parents.
The COVID-19 pandemic is affecting the sexual and reproductive health of adolescents and young adults due to social distancing, school closures, and limited access to contraception and abortion care. Despite reduced opportunities for sex, many youth face significant challenges in accessing necessary healthcare services.
Researchers found that Paramecium, a single-celled organism, uses sex as a way to cope with stress and increase survival rates. The study suggests a mechanistic link between sex and the stress response, where increased expression of heat shock proteins during sexual reproduction provides protection from stressors.
A NYU study published in Pediatrics reveals that a triadic intervention involving parents and healthcare providers significantly reduces adolescent sexual risk behavior. The Families Talking Together program delays sexual debut by 12 months and increases condom use among adolescents aged 11-14.
A global COVID-19 response that neglects sexual and reproductive health and justice inequities exacerbates existing social and economic burdens on these groups. The authors advocate for a human rights framework to address the pandemic's inequitable effects.
A scoping review found that many popular fertility and pregnancy planning apps lack accuracy, particularly in predicting fertile windows and preventing unplanned pregnancies. The studies suggest that these apps should be developed with the involvement of fertility specialists to ensure their safety and effectiveness.
A study published in BMJ Sexual & Reproductive Health found that having 10 or more lifetime sexual partners is associated with a heightened risk of cancer diagnosis in both men and women. Women who reported this number were 91% more likely to be diagnosed, while those with limiting chronic conditions were 64% more likely. The study sug...
Researchers found that consuming 60 grams of nuts per day can improve orgasm quality and sexual desire. The study involved 83 participants who followed a western diet and were divided into two groups: one with a daily nut intake and the other without.
Researchers have identified two distinct allelic variants, Jek1 and Jek3, within the Jekyll gene in barley, which has significant implications for understanding speciation and cellular processes.
Researchers suggest that sexual reproduction prevents invasion of transmissible cancer by generating genetic variation and detecting foreign cells. This theory proposes a novel explanation for the evolution of sex in multicellular organisms, shifting our understanding of evolutionary biology.
A study found that sexual satisfaction among older people is influenced by factors beyond just health, including communication with partners, relationship quality, and lifestyle. The research highlights the importance of a holistic approach for healthcare professionals when discussing sexual problems with older adults.
Older women who are sporty or bisexual tend to have had a higher number of lifetime sexual partners. Meanwhile, income and same-sex preference play a significant role in the number of partners for older men. The study highlights the importance of considering sociodemographic factors when assessing health risks.
Research finds that nearly half of young Britons don't feel ready for their first sexual experience, regardless of age. The study highlights the need for a more nuanced approach to addressing this milestone, taking into account factors such as partnership stability and communication skills.
A review of evidence reveals that as many as one in four women attending sexual and reproductive healthcare services report being coerced into controlling their own reproductive lives. Coercive control, including 'contraceptive sabotage,' undermines women's autonomy and has serious negative consequences.
Healthcare leaders call on the UK government to lift restrictions on taking abortion pills at home, citing improved access for vulnerable women. The move would align with Scotland and Wales' existing policies and reduce unnecessary clinic visits, bettering women's dignity and wellbeing.
Experts say current marketing of sexbots is misleading due to lack of research on their pros and cons. While they may have therapeutic potential, their impact on society remains unclear.
Grand Challenges Canada announces $10 million investment in 100 innovative projects addressing women's and children's health challenges in low- and middle-income countries. The projects aim to reduce maternal mortality, improve reproductive healthcare, and combat stigmas, with potential to save 1.1 million lives by 2030.
A Montana State University professor has won a five-year, $3.12 million grant to conduct research on sexual and reproductive health among American Indian youth in Montana and abroad. The 'We Are Here Now' study aims to improve the health and well-being of indigenous youth through community-based participatory research.
A new Lancet Commission proposes a comprehensive package of interventions addressing neglected areas like infertility services, prevention, and counselling for gender-based violence. Meeting all needs for sexual and reproductive health services would require a minimum global investment of $54 billion annually.
Mobile health units offer a portable approach to bringing healthcare to communities, with over 2,000 units in service nationwide. Adolescents surveyed expressed interest in learning about sexual health through MHUs, with high rates of willingness to obtain birth control and recommend the service to friends.
The projects focus on advancing sexual and reproductive health and rights of women and girls. In Rwanda, affordable menstrual pads will be distributed to adolescent girls, while in Kenya, HIV/STI education and vocational training will reduce infections among vulnerable adolescents.
New guidelines permit full spectrum of conscientious objection, allowing trainees to opt out of abortion or contraceptive services due to personal beliefs. However, they must prioritize patients' sexual and reproductive health needs first.
The Heilbrunn Department at Columbia University is conducting a study to measure the impact of the expanded Mexico City Policy on women's health and wellbeing in Kenya and Nepal. The research aims to assess the current policy's effects on access to life-saving services such as abortion, contraception, and HIV testing and treatment.
The study, published in Journal of Adolescent Health, analyzed nationally-representative data from Natsal surveys and found rising prevalence of oral and anal sex among 16-24 year olds, with median age at first heterosexual experience remaining stable.
A study by Indiana University researchers found that US women have diverse preferences for genital touch, location, pressure, shape, and pattern, with 41% preferring a single style of touch. The study also revealed that nearly 75% of women require clitoral stimulation to achieve orgasm during intercourse.
Researchers Fei Zhao and colleagues discovered a hormone-sensing nuclear receptor that contributes to Wolffian duct degeneration in females. The finding challenges the long-held assumption that androgens are essential for Wolffian duct retention, suggesting alternative mechanisms may be at play.