Navigation Links
University of East Anglia research shows how females choose the 'right' sperm
Date:8/16/2013

but little has been known about its function.

Prof Gage said: "We ran further sperm competition trials but this time we rinsed eggs of their ovarian fluid and then added back either their own fluid, or that from the other species. Remarkably, we found that the egg itself plays no significant role in promoting fertilization precedence by their own species' sperm. Instead, it is actually the ovarian fluid that controls which species' sperm wins the fertilizations, which was very unexpected. If we put salmon ovarian fluid onto salmon eggs, then salmon sperm win, but if we put trout ovarian fluid onto eggs from that same salmon female, trout sperm now win."

The researchers then used Video Tracking Analysis to analyse how salmon and trout sperm behave in ovarian fluid.

"We found that activating sperm in ovarian fluid makes them live about twice as long as in river water. Importantly, both species' sperm also switch from swimming in tight elliptical circles in river water, to swimming in straightened trajectories in ovarian fluid. This behaviour allows sperm to navigate towards the egg by following a chemical cue.

"So what we're seeing is that ovarian fluid gives a specific chemical signal to the sperm of its own species, causing changes in the way their tails beat, so that they swim in a straighter trajectory, and therefore guided more effectively towards the site of fertilization."

To establish that this was the mechanism which promoted fertilization precedence by their own species' sperm, the research team ran a final experiment in which they measured sperm migration across a membrane permeated with tiny pores mimicking the single entrance into the egg. They found that many more sperm swam through the membrane into their own ovarian fluid, compared with numbers crossing into the other species' ovarian fluid or water.

"These findings allow us to establish that females have indeed evolved mechanisms of 'cryptic choi
'/>"/>

Contact: Lisa Horton
l.horton@uea.ac.uk
44-016-035-92764
University of East Anglia
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. New University of Michigan Study Discovers Obesity Causes Vary By Gender
2. Western University of Health Sciences to Welcome More Than 1,100 New Students
3. Thomas Jefferson University Kimmel Cancer Center: Researchers Find New Clues to Treat Rare and Aggressive Inflammatory Breast Cancer
4. Alvernia University RN to BSN Program to Begin at Montgomery County Community College (MCCC)
5. Co-Creator of MotherPeace Tarot Cards to Host Two Day Workshop at Sofia University
6. Averett University Retains B. E. Smith to Provide Interim Leadership and Recruit Chair of Nurse Education
7. New Jersey Based University Radiology Joins Forces with Strategic Radiology
8. Autism Play Therapist, Carolina Kaiser to Hold Workshop at Sofia University
9. New York University College of Dentistry Hosting DENTCA CAD/CAM Denture Seminar for 250 Dentists, Residents, Prosthodontists, Denturists and Academic Leaders on Aug. 22
10. Sofia University Professor Dr. Kris Brandenburger Receives International Education Faculty Achievement Award
11. University of Western States Massage Therapy Program Receives Accreditation from Commission on Massage Therapy
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/14/2014)... 2014 Summer is the best season of ... the beach, swimming and other outdoor adventures. The promotional product ... happy and healthy all summer long. The promo product gurus ... three must-have custom imprinted products everyone must have on hand ... course sunblock. Sunscreen helps protect skin from harmful ...
(Date:7/14/2014)... (PRWEB) July 14, 2014 Crystal Dental ... office in Sacramento. The announcement has been made via LAD ... In addition, the announcement has been made in order to ... services in the Sacramento area. , Crystal Dental offers a ... of the services offered by Crystal Dental include cosmetic dentistry ...
(Date:7/13/2014)... 2014 FORT LEE, N.J. – Authors ... approach to the science of tooth implants in ... This book describes recent advances and techniques in the world ... benefit people who have lost all of their natural teeth. ... first lower subperiosteal implant in 1940. It was a ...
(Date:7/13/2014)... 14, 2014 Recently, TopDresses100.com, a popular ... new range of multi-colored Quinceanera dresses to ... all of these colorful outfits are guaranteed to be ... up to 68% off. , TopDresses100.com has a wide ... and all its items are in stock and ready ...
(Date:7/13/2014)... 2014 Manchester United and AS Roma ... Guinness International Champions Cup. The 2014 ICC is one ... because of the talent of it brings in. Teams like ... will compete in the 2014 event spread across 10 American ... a game between Olympiacos and Milan and will conclude with ...
Breaking Medicine News(10 mins):Health News:Why These Three Summer Essentials from 4AllPromos Can Improve Summer 2Health News:Crystal Dental Announces the Opening of New Office Location in Sacramento 2Health News:Authors Leonard I. Linkow and Sheldon Winkler Feature Advancements in Implant Dentistry 2Health News:Authors Leonard I. Linkow and Sheldon Winkler Feature Advancements in Implant Dentistry 3Health News:Authors Leonard I. Linkow and Sheldon Winkler Feature Advancements in Implant Dentistry 4Health News:Cheap Multi-colored Quinceanera Dresses From TopDresses100.com 2Health News:Manchester United vs. AS Roma Tickets in Denver, CO at Sports Authority Field at Mile High: Ticket Down Slashes Ticket Prices on International Champions Cup in Denver 2Health News:Manchester United vs. AS Roma Tickets in Denver, CO at Sports Authority Field at Mile High: Ticket Down Slashes Ticket Prices on International Champions Cup in Denver 3
... 2011) Top radiology and policy experts will offer ... at the First Annual ACR Imaging Informatics Summit and ... vendors are all encouraged to attend the two-day event ... "With future Medicare reimbursement tied ...
... Goodwin HealthDay Reporter , THURSDAY, Sept. 22 (HealthDay ... friends, playing is one of the hallmarks of childhood. But ... in the United States have far less time to ... may have serious consequences for their development and mental health. ...
... than two-thirds of men who contacted an email advice service ... which were frequently linked to loss of sex drive, according ... International Journal of Clinical Practice . The study ... men from the Middle East and Indian subcontinent sought email ...
... medical information? Viewers beware, doctors caution. After reviewing ... a group of neurologists found that the people in ... As described in a Letter to the Editor in ... misinformation may confuse patients suffering from devastating neurological disorders ...
... By Amanda Gardner HealthDay Reporter , WEDNESDAY, ... a thin ray of hope to people suffering from the ... The compound, currently known only as BIBF 1120, seems to ... for patients, according to a study funded by the drug,s ...
... Institutes of Health (NIH) has awarded researchers at The ... grants to create novel therapeutics for treating heart disease ... the time and costs required to test drugs for ... $143.8 million funding initiative provided by NIH this year ...
Cached Medicine News:Health News:Experts offer solutions at ACR Imaging Informatics Summit & Radiation Dose Monitoring Forum 2Health News:Less Play Time = More Troubled Kids, Experts Say 2Health News:Less Play Time = More Troubled Kids, Experts Say 3Health News:Email sexual advice study highlights problems raised by different ages and cultures 2Health News:Email sexual advice study highlights problems raised by different ages and cultures 3Health News:YouTube videos can inaccurately depict Parkinson’s disease and other movement disorders 2Health News:Drug Shows Promise Against Deadly Lung Disease 2Health News:Drug Shows Promise Against Deadly Lung Disease 3Health News:UT awarded NIH grants to study prevention and treatment of neurodegenerative and vascular diseases 2Health News:UT awarded NIH grants to study prevention and treatment of neurodegenerative and vascular diseases 3
(Date:7/11/2014)... ALBANY, New York , July 11, 2014 /PRNewswire/ ... published by Transparency Market Research "Endoscopy Devices Market (Endoscopes, ... Analysis, Size, Share, Growth, Trends and Forecast, 2013-2019" the ... billion in 2012 and is expected to grow at ... reach an estimated value of USD 36.9 billion in ...
(Date:7/11/2014)... , July 11, 2014 ... to Safety & Health Expo 2014 were ... move to London , ... attending exhibition.          ... http://photos.prnewswire.com/prnh/20140711/696892-a )      (Photo: ...
(Date:7/10/2014)... , 11. Juli 2014  Dilon ... für die molekulare Bildgebung, einschließlich molekularer ... die CE-Zulassung für sein Navigator ® ... Dilon das Produkt jetzt europaweit vertreiben. ... Großteil der europäischen Länder ausgedehnt und ...
Breaking Medicine Technology:Global Endoscopy Devices Market is Expected to Reach USD 36.9 Billion by 2019: Transparency Market Research 2Global Endoscopy Devices Market is Expected to Reach USD 36.9 Billion by 2019: Transparency Market Research 3Global Endoscopy Devices Market is Expected to Reach USD 36.9 Billion by 2019: Transparency Market Research 4Global Endoscopy Devices Market is Expected to Reach USD 36.9 Billion by 2019: Transparency Market Research 5Global Endoscopy Devices Market is Expected to Reach USD 36.9 Billion by 2019: Transparency Market Research 6UK's Flagship Health & Safety Event Has Successful Inaugural Year in London 2UK's Flagship Health & Safety Event Has Successful Inaugural Year in London 3UK's Flagship Health & Safety Event Has Successful Inaugural Year in London 4Dilon erhält CE-Zulassung für sein Navigator-Gamma-Sondensystem 2
... BellaNovus Development Company LLC, a medical design ... the Ouchless™ Needle Collection. The devices provide doctors ... creams and ice currently used to minimize localized ... and dermal fillers. Offered in three models, Ouchless™ ...
... CIVCO Medical Solutions is showcasing its RFSuite RFID tracking ... also hosting an RFSuite Symposium Monday, August 1st, from ... the Fairmont Waterfront, Vancouver. The event will include lunch, ... Click here to view the invitation and register . ...
Cached Medicine Technology:New Ouchless™ Needle Collection Revolutionizes Wrinkle Treatments With State-of-the-Art Pain Reducing Technology 2CIVCO Showcases RFSuite RFID Tracking and Verification System at AAPM 2011 Booth #817 2CIVCO Showcases RFSuite RFID Tracking and Verification System at AAPM 2011 Booth #817 3
... Easy Breeze Air Gel Dryer : Dry up ... 24 gels 8 10 cm without a ... rapid drying, or no heat for controlled drying ... transparent, dried gels. Add and remove gels at ...
Each GelAir™ system drying frame includes two main components, a plastic drying outer frame and a metal square inner frame, as well as 8 clamps per frame. Supplied as a set of two frames....
... Breeze Air Gel Dryer : Dry up to ... gels 8 10 cm without a vacuum ... drying, or no heat for controlled drying of ... dried gels. Add and remove gels at any ...
... SGD5040 Slab Gel Dryer incorporates sturdy metal housing and ... The large surface area makes it perfect for drying ... Slim Profile 40cm x 50cm (W x D) ... Rates allows you to optimize your heating ...
Medicine Products: