Navigation Links
Sperm can count
Date:3/7/2012

This release is available in German.

Sperm have only one aim: to find the egg. The egg supports the sperm in their quest by emitting attractants. Calcium ions determine the beating pattern of the sperm tail which enables the sperm to move. Together with colleagues from the Max Planck Institute for the Physics of Complex Systems in Dresden and the University of Gttingen, scientists from the caesar research centre in Bonn, an institute of the Max Planck Society, have discovered that sperm only react to changes in calcium concentration but not to the calcium concentration itself. Probably sperm make this calculation so that they remain capable of manoeuvring even in the presence of high calcium concentrations.

The swimming path on which sperm follow the mating call of the egg, varies according to species. Sperm in particular those of marine species swim along convoluted paths in a chemical concentration gradient. Their swimming style is controlled by the calcium ions in the sperm tail. It was previously believed that in high calcium concentrations, the sperm tails make asymmetrical, whip-like movements and their swimming path is very curved, while in low calcium concentrations, the tails beat symmetrically and the sperm swim on a straight line. The alternation of high and low calcium concentrations was thought to propel sperm along spiral-shaped swimming paths. However, this simple model was repudiated by experiments on freely-swimming sperm and presented researchers with something of a mystery.

The scientists have now succeeded in solving this mystery. Using ingenious stroboscopic laser illumination similar to that used in discotheques project leader Luis Alvarez was able to trace the movement of a sperm in detail, and simultaneously measure the changes in the calcium concentration. The result was astonishing: the sperm tail only reacted
'/>"/>

Contact: Luis Alvarez, Ph.D.
luis.alvarez@caesar.de
49-228-965-6354
Max-Planck-Gesellschaft
Source:Eurekalert

Page: 1 2

Related biology news :

1. Low sperm count may be associated with prenatal testosterone excess
2. Proteins in sperm unlock understanding of male infertility says new study
3. The more promiscuous the female, the speedier the sperm
4. CSHL scientists discover how companion cells to sperm protect them from genetic damage
5. The egg makes sure that sperm dont get too old
6. Spread your sperm the smart way
7. ESHREs workshop on freezing of human sperm, eggs and embryos in Athens
8. MMS and NOAA scientists study prey of Gulf of Mexico sperm whales
9. Molecular study could push back angiosperm origins
10. Females shut down male-male sperm competition in leafcutter ants
11. UT Southwestern researchers use novel sperm stem-cell technique to produce genetically modified rats
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/11/2014)... SALEM, N.C. , Dec. 10, 2014  That blood ... for quite a while. Hypertension – the medical term for ... in the early 1800s, and the inflatable cuff that,s used ... That doesn,t, however, mean there,s nothing new about hypertension, its ... some long-held beliefs about the condition and the best ways ...
(Date:12/10/2014)... -- CIE San Diego has launched an innovative trust ... that enhances care coordination among social service and care ... earned a second $1 million grant from the Alliance ... in community and; will be recognized as a "Live ... 4-6p. CIE San Diego today announced the ...
(Date:12/4/2014)... 3, 2014  Crossmatch™, a leading provider of ... DigitalPersona ® Pro Enterprise software and U.are.U ... throughout First Bank branch locations in ... and Virginia. First Bank, a progressive community ... North Carolina , selected the Crossmatch biometrics-based ...
Breaking Biology News(10 mins):Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 2Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 3Community Information Exchange San Diego Launches Pilot, Secures $1 Million Expansion Grant, and Becomes a "Live Well San Diego" Partner 4First Bank Partners with Crossmatch to Increase Log In Security 2First Bank Partners with Crossmatch to Increase Log In Security 3
... could help deliver drugs and shape the growth of ... supermodel lips. But by mating collagen with a molecular ... some important medical advances. The researchers have found a ... for better infection-fighting bandages and a treatment to block ...
... bit of biology called site-specific recombination, DNA can travel inside ... of grafting surgery that allows it to insert its chromosome ... important because mobile DNA can carry genes that cause drug ... result in certain leukemias or other cancers. , But what ...
... blindness in older adults, yet researchers are still in ... this incurable disease. , But new insight from University ... between rhesus monkeys with macular degeneration and humans could ... when severe vision loss could still be stopped. , ...
Cached Biology News:Unusual antibiotics show promise against deadly 'superbugs' 2Unusual antibiotics show promise against deadly 'superbugs' 3Brown-Harvard team solves mobile DNA's surgical sleight-of-hand 2Genetic links could unlock clues to leading cause of blindness 2Genetic links could unlock clues to leading cause of blindness 3
(Date:12/24/2014)... Pipette.com announces their Holiday in the ... their #HolidayInTheLab pictures for a chance to win pipette-themed ... those struggling to think of a holiday gift for ... Lab Contest provides the ideal holiday presents. The #HolidayInTheLab ... pictures of their chemistree, holiday sweaters, as well as ...
(Date:12/24/2014)... LOUIS , Dec. 23, 2014 ... today that the waiting period under the Hart-Scott-Rodino ... the acquisition expired on December 22, 2014, thereby ... review requirement for the acquisition of the Company ... U.S. antitrust clearance satisfies another condition to closing ...
(Date:12/22/2014)... Md. , Dec. 22, 2014 /PRNewswire/ ... SYN), a developer of pathogen-specific therapies for ... on protecting the microbiome, today announced positive ... Phase 1a clinical trial of SYN-004, the ... prevention of Clostridium difficile (C. difficile) ...
(Date:12/22/2014)... 22, 2014  ( www.competitivehealth.com ) — Competitive Health ... bill review and advocacy service, has signed an agreement ... Savings discount health services marketplace. 63% of ... than they expected to pay. As part of an ... WellCard Savings is pleased to offer medical bill review ...
Breaking Biology Technology:Major Pipette Distributor Pipette.com Announces their Holiday in the Lab Contest 2Acquisition of Sigma-Aldrich by Merck KGaA, Darmstadt, Germany, Receives U.S. Antitrust Clearance 2Acquisition of Sigma-Aldrich by Merck KGaA, Darmstadt, Germany, Receives U.S. Antitrust Clearance 3Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 2Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 3Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 4Synthetic Biologics Announces Positive Topline Results from Phase 1a Trial of SYN-004 for the Prevention of C. difficile Infection 5WellCard Savings Announces CoPatient Medical Bill Review Service for Members 2
... from roadside bombs to freeway crashes. Traumatic injury, the leading ... overwhelms the body,s natural blood-clotting process. In an effort ... Lavik, a new Case Western Reserve University biomedical engineering professor, ... platelets that show promise in halting internal and external bleeding. ...
... , Nursing Care at Hahnemann among the Best ... University Hospital proudly announces it has been granted Magnet(R) recognition ... Magnet(R) is one of the highest levels of recognition a ... the five percent of hospitals in the country that have ...
... , , , , ... of the world,s leading research and advisory firms for ... from surveyed dermatologists, Centocor Ortho Biotech/Janssen-Cilag,s Stelara and Abbott,s ... the biologics share in 2012 in the drug market ...
Cached Biology Technology:Researchers take the inside route to halt bleeding 2Hahnemann University Hospital Granted Magnet(R) Status 2Hahnemann University Hospital Granted Magnet(R) Status 3In 2012, Stelara and Briakinumab Will Capture 22 Percent of the Biologics Share in the Moderate to Severe Psoriasis Drug Market 2In 2012, Stelara and Briakinumab Will Capture 22 Percent of the Biologics Share in the Moderate to Severe Psoriasis Drug Market 3
Rabbit polyclonal to Xanthine Oxidase (HRP) ( Abpromise for all tested applications). Antigen: Xanthine Oxidase (from Bovine Buttermilk) Entrez Gene ID: 7498 Swiss Protein ID: P47989...
Phospho- (Ser) 14-3-3 Binding Motif (4E2) Mouse mAb...
Drugs and NO-drug Rat Anti-conjugated Acetyl Salicylic Acid Polyclonal Antibody...
GBL Antibody...
Biology Products: