Navigation Links
Men shed light on the mystery of human longevity, study finds
Date:9/13/2007

to show that selection favors survival for as long as men reproduce." The scientists presented a "range of data showing that males much older than 50 years have substantial realized fertility through matings with younger females, a pattern that was likely typical among early humans." As a result, Puleston said, older male fertility helps to select against damaging cell mutations in humans who have passed the age of female menopause, consequently eliminating the "wall of death."

"Our analysis shows that old-age male fertility allows evolution to breach Hamilton's wall of death and predicts a gradual rise in mortality after the age of female menopause without relying on 'grandmother' effects or economic optimality," the researchers say in the paper.

The scientists compiled longevity and fertility data from two hunter-gatherer groups, the Dobe !Kung of the Kalahari and the Ache of Paraguay, one of the most isolated populations in the world. They also looked at the forager-farmer Yanomamo of Brazil and Venezuela, and the Tsimane, an indigenous group in Bolivia. "They're living a lifestyle that our ancestors lived and their fertility patterns are probably most consistent with our ancestors," Puleston said about the four groups. The study also looked at several farming villages in Gambia and, for comparison, a group of modern Canadians.

In the less developed, traditional societies, males were as much as 5-to-15 years older than their female partners. In the United States and Europe, the age spread was about two years. "It's a universal pattern that in typical marriages men are older than women," Puleston said. "The age gaps vary by culture, but in every group we looked at men start [being sexually reproductive] later. At the end of reproduction, male fertility rates taper off gradually, as opposed to the fairly sharp decline in female fertility by menopause."

Despite small differences based on marriage tradition
'/>"/>

Contact: Lisa Trei
lisatrei@stanford.edu
650-725-0224
Stanford University
Source:Eurekalert

Page: 1 2 3 4

Related biology news :

1. Researchers discover way to make cells in the eye sensitive to light
2. Recent breakthroughs in common adult leukemia highlighted in New England Journal of Medicine
3. Bacteria collection sheds light on urinary tract infections
4. Sea skate experiment sheds light on human cell transport
5. X-Ray Beams And Fruit Fly Flight Simulator Aid Scientists View Of Muscle Power
6. McGill researchers shed light on formation of carcinogen in food
7. Scientists discover how plants disarm the toxic effects of excessive sunlight
8. Light therapy may combat fungal infections, new evidence suggests
9. Medical molecules designed to respond to visible light that can penetrate tissue
10. Genetic defects give the immune system the green light to attack the pancreas
11. Researchers find gene that may be at root of potato blight
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/30/2014)... that a new class of chemical compounds makes ... have also pinpointed the relevant target enzyme, thus ... , Researchers led by LMU,s Professor Angelika Vollmar ... Mnchen have identified a class of chemicals that ... against malignant tumors. The compound is itself non-toxic, ...
(Date:9/30/2014)... of perilous threats in today,s ocean. From overfishing ... fragile coral ecosystems are disappearing at unprecedented rates ... of corals surrounding the island of Moorea in ... tropical environment: coral guard-crabs. New research from the ... scientist Seabird McKeon and the museum,s predoctoral fellow ...
(Date:9/29/2014)... DC September 29, 2014 -- Plants have ... bacteria help the pants extract nutrients and defend ... pathogens from contaminating fruits and vegetables. Now, scientist ... bacteria inside of seeds; thus ensuring that sprouting ... from the University of Notre Dame, presented their ...
Breaking Biology News(10 mins):Cancer therapy: Driving cancer cells to suicide 2Smithsonian scientists discover coral's best defender against an army of sea stars 2Plants prepackage beneficial microbes in their seeds 2
... the past three decades, saturated fat has been considered a major ... persists in recommending reduced consumption of this macronutrient. However, new ... impact on CVD risk -- causing many to rethink the "saturated ... articles published in the October issue of Lipids ...
... New York, 1 October, 2010 A special article ... the recent Report of the 2010 Dietary Guidelines Advisory Committee ... to conform to the standards of evidence-based medicine, despite its ... The authors call the DGAC to task for failing to ...
... protein, STIM1, known to activate store-operated calcium channels has ... to researchers at Temple University. The researchers published ... Orai and Cav1.2 Channels, in the Oct. 1 issue ... Calcium, not just important for bones and teeth, is ...
Cached Biology News:Think saturated fat contributes to heart disease? Think again 2Think saturated fat contributes to heart disease? Think again 3Proposed dietary guidelines for Americans sharply debated 2Protein provides link between calcium signaling in excitable and non-excitable cells 2
(Date:9/30/2014)... (PRWEB) September 30, 2014 Proove ... medicine, is excited to announce a new genetic test ... The Proove Pain Perception Test will provide physicians ... and why pain tolerance levels are stratified between individuals. ... identify whether a person has a genetic predisposition that ...
(Date:9/30/2014)... Fla. , Sept. 30, 2014 CORD:USE ... pleased to announce that it has entered into an ... Inc. (Tianhe) which has licensed a series of patented technologies ... cells for possible clinical applications.  Tianhe is performing Phase ... and Spain using Tianhe,s Stem ...
(Date:9/30/2014)... September 30, 2014 OriginOil Inc. (OTC/QB: ... chemical-free process to clean up large quantities of water, ... Riggs Eckelberry reported on the launch of the company's ... site provided by partner STW Resources . , ... barrels per day (bpd) and achieved a 99.8% reduction ...
(Date:9/30/2014)... DEL MAR, Calif. , Sept. 30, 2014 /PRNewswire/ ... devices for women,s health announces its receipt of a ... The FemmyCycle menstrual cup has also received FDA clearance ... Health Canada, and the CE in Europe. This patent is ... design. In conjunction with this issuance, the company is releasing ...
Breaking Biology Technology:Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 2Proove Biosciences is Now Offering the Proove Pain Perception Genetic Test to Help Physicians Assess Patient Pain Tolerance Levels 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 2CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 3CORD:USE is Pleased to Announce it has Partnered with Tianhe Stem Cell Biotechnologies, Developer of Cord Blood Stem Cell Therapy Showing Promising Results in Clinical Trials for the Treatment of Diabetes and Autoimmune Diseases 4OriginOil, Inc. Report to Shareholders: Blue Gold in West Texas 2The FemmyCycle 2
... Emmy® and Tony® award-winning actress Blythe Danner and Amgen ... Reduce Fractures™, an educational campaign for women with postmenopausal ... Danner was diagnosed with postmenopausal osteoporosis at increased risk ... to educate themselves, take action and speak to their ...
... August 25, 2011 Amsterdam Molecular Therapeutics (Euronext: ... today reported its results for the first half year of ... , Glybera®: , Data showing Glybera produces significant reduction ... Atherosclerosis Society Meeting CHMP does not consider Glybera ...
... Biocept, Inc., a privately-held CLIA-certified laboratory testing company, focused ... (CTCs) in cancer patients, and Clarient, Inc. (a GE ... of a proprietary blood test for CTCs in breast ...  Clarient and Biocept will market and sell Biocept,s new ...
Cached Biology Technology:Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 2Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 3Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 4Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 5Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 6Award-Winning Actress Blythe Danner and Amgen Launch Act 2 Reduce Fractures™ Educational Campaign 7Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 2Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 3Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 4Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 5Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 6Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 7Amsterdam Molecular Therapeutics Reports Half-Year Results 2011 8Biocept and Clarient Announce Collaboration on First Test for Circulating Tumor Cells and HER2 Status in Breast Cancer Patients 2Biocept and Clarient Announce Collaboration on First Test for Circulating Tumor Cells and HER2 Status in Breast Cancer Patients 3Biocept and Clarient Announce Collaboration on First Test for Circulating Tumor Cells and HER2 Status in Breast Cancer Patients 4
Mouse monoclonal antibody raised against a partial recombinant EOMES. NCBI Entrez Gene ID = EOMES...
...
Rabbit polyclonal to MCP2 ( Abpromise for all tested applications). entrezGeneID: 6355 SwissProtID: P49873...
Mouse monoclonal antibody raised against a partial recombinant AATK. NCBI Entrez Gene ID = AATK...
Biology Products: