Navigation Links
Did walking on 2 feet begin with a shuffle?
Date:5/29/2008

Somewhere in the murky past, between four and seven million years ago, a hungry common ancestor of todays primates, including humans, did something novel. While temporarily standing on its rear feet to reach a piece of fruit, this protohominid spotted another juicy morsel in a nearby shrub and began shuffling toward it instead of dropping on all fours, crawling to the shrub and standing again.

A number of reasons have been proposed for the development of bipedal behavior, or walking on two feet, and now researchers from the University of Washington and Johns Hopkins University have developed a mathematical model that suggests shuffling emerged as a precursor to walking as a way of saving metabolic energy.

Metabolic energy is produced by what an animal eats, enabling it to move. But it is a limited resource, particularly for young-bearing females which have to take care of and feed their offspring. Finding food is vitally important, and an animal needs to save energy and use it efficiently, said Patricia Kramer, a UW research assistant professor of anthropology and co-author of a recent study.

She believes it was an empty belly, along with a need to conserve energy, that prompted that early ancestor to shuffle.

Hunger. It is always hunger, said Kramer. There is nothing that will get you to do something you dont want to do other than food. Thats why we bribe animals with food to train them.

Because of a huge gap in the fossil record that hides when humans split off from other primates, Kramer and co-author Adam Sylvester, now a postdoctoral fellow at Johns Hopkins University, used the chimpanzee as a way of looking into the past and testing other researchers ideas about the origins of bipedalism.

Chimpanzees are humans closest relatives. They basically walk on all fours, partially resting their weight on the knuckles of their hands.

A chimps body plan is very much like that of a primitive ape, and our last common ancesto
'/>"/>

Contact: Joel Schwarz
joels@u.washington.edu
206-543-2580
University of Washington
Source:Eurekalert

Page: 1 2

Related biology news :

1. Walking tall to protect the species
2. War between the sexes begins before twins birth, TAU researchers say
3. iPlant Kickoff Conference at CSHL begins tackling plant biologys grand challenges
4. Clinical trial that may help patients breathe easier begins at Central DuPage Hospital
5. DHS Begins Collecting 10 Fingerprints From International Visitors at New Yorks John F. Kennedy International Airport
6. DHS Begins Collecting 10 Fingerprints From International Visitors at Detroit Metropolitan Wayne County Airport
7. DHS Begins Collecting 10 Fingerprints From International Visitors at Orlando International Airport
8. DHS Begins Collecting 10 Fingerprints From International Visitors at Miami International Airport
9. DHS Begins Collecting 10 Fingerprints From International Visitors at San Francisco International Airport
10. Avian origins: new analysis confirms ancient beginnings
11. DHS Begins Collecting 10 Fingerprints From International Visitors at George Bush Houston Intercontinental Airport
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/19/2014)... MOUNTAIN VIEW, Calif. , Dec. 18, 2014 /PRNewswire/ ... the publication of a study that pinpoints fine-scale differences ... the United States . Since immigrants ... the United States has served as ... study illuminates how American history and the ongoing mixing ...
(Date:12/17/2014)... Dec. 15, 2014 The Defense Logistics ... easier to detect and prevent counterfeit microcircuits from ... the agency started performing an in-house microcircuit anti-counterfeit ... the authenticity of purchased microcircuits while increasing their ... control measures will be conducted at DLA,s Electronics ...
(Date:12/17/2014)... , Dec. 16, 2014 Research and ... the addition of the "Global Chemical Sensor ... http://photos.prnewswire.com/prnh/20130307/600769 ... the increasing demand for medical sensors in biomedical ... data for quick and correct diagnosis during surgical ...
Breaking Biology News(10 mins):23andMe Study Sketches Genetic Portrait of the United States 223andMe Study Sketches Genetic Portrait of the United States 323andMe Study Sketches Genetic Portrait of the United States 4Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3Global Chemical Sensor Market 2015-2019: Key Vendors are Abbott Laboratories, Bayer, Hoffmann La-Roche, Johnson & Johnson, NGK Spark Plugs and Robert Bosch 2
... species within a community and are commonly transmitted ... pathogen emergence and therefore has been considered as ... of agricultural importance. Many pathogens like malaria, Lyme ... hosts are commonly transmitted by vectors, and their ...
... Researchers at Yale, in collaboration with NIH researchers, have ... the immune system for detection of parasitic infections, leading ... these infections. , Published in the April 28 issue ... how infectious parasites interface with the immune system--a problem ...
... shows that farmers who used agricultural insecticides experienced ... longer using the products. Data from 18,782 North ... including organophosphates and organochlorines, to reports of reoccurring ... and other neurological symptoms. Some of the insecticides ...
Cached Biology News:A new study examines how shared pathogens affect host populations 2Yale researchers identify molecule for detecting parasitic infection in humans 2Use of Insecticides Linked to Lasting Neurological Problems for Farmers 2
(Date:12/24/2014)... -- PharmaBoardroom,s new report, , Healthcare ... for free download , digs deep into this vibrant ... the sector today. One area where ... developing a homegrown pharmaceutical manufacturing base, even if the government,s ... way off. A cursory comparison with neighboring Morocco ...
(Date:12/24/2014)... NEW YORK , Dec. 23, 2014 /PRNewswire/ ... study of mazindol in children with attention deficit/hyperactivity disorder ... December 2014 . The paper, titled ... attention deficit/hyperactivity disorder" ( Konofal et al, ... eCollection 2014 ) shows that mazindol might be ...
(Date:12/22/2014)... 2014 /PRNewswire/ - RepliCel Life Sciences Inc. (OTCQB: REPCF) ... on the development of autologous cell therapies, announced today ... of Calgary in conjunction with co-authors from Kyoto University ... the company,s ongoing clinical research using dermal sheath cup ... The paper entitled " Hair Follicle Dermal ...
(Date:12/22/2014)... , Dec. 22, 2014  ( www.competitivehealth.com ) ... an online medical bill review and advocacy service, has ... the FREE WellCard Savings discount health services marketplace. ... that was more than they expected to pay. As ... health care costs, WellCard Savings is pleased to offer ...
Breaking Biology Technology:PharmaBoardroom Releases New Algeria Pharmaceuticals Report 2PharmaBoardroom Releases New Algeria Pharmaceuticals Report 3Redefining ADHD: A New Approach & A Shift of Paradigm in ADHD Therapeutics 2Redefining ADHD: A New Approach & A Shift of Paradigm in ADHD Therapeutics 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 2Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 3Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 4Newly Released Peer-Reviewed Publication Further Validates RepliCel's Use of Dermal Sheath Cup Cells to Treat Pattern Baldness 5WellCard Savings Announces CoPatient Medical Bill Review Service for Members 2
... June 21 /PRNewswire-FirstCall/ - Aeterna Zentaris Inc. (NASDAQ: ... drug development company specialized in oncology and endocrinology, announced ... direct offering of US$12.1 million of units ... to certain institutional investors. Net proceeds from this offering, ...
... Fla. , June 21 Dyadic International, ... cutting-edge C1 platform technology addresses the needs of the ... scale which efficiently convert biomass into ethanol and other ... engaged the influential consulting firm, The Abraham Group, to ...
... WA , and VANCOUVER , June 21 ... ) announced today the initiation of a Phase 3 ... candidate being developed for the treatment of castrate-resistant prostate ... Cancer SATURN Trial, is the first of three Phase ...
Cached Biology Technology:Aeterna Zentaris Receives US$12 Million on Closing of Registered Direct Offering 2Aeterna Zentaris Receives US$12 Million on Closing of Registered Direct Offering 3Dyadic International Engages The Abraham Group as Strategic Advisor 2Dyadic International Engages The Abraham Group as Strategic Advisor 3Dyadic International Engages The Abraham Group as Strategic Advisor 4OncoGenex Pharmaceuticals Announces Initiation of a Phase 3 Trial in Men with Metastatic Prostate Cancer 2OncoGenex Pharmaceuticals Announces Initiation of a Phase 3 Trial in Men with Metastatic Prostate Cancer 3OncoGenex Pharmaceuticals Announces Initiation of a Phase 3 Trial in Men with Metastatic Prostate Cancer 4OncoGenex Pharmaceuticals Announces Initiation of a Phase 3 Trial in Men with Metastatic Prostate Cancer 5
Values of steady state parameters for enzyme activities are determined....
... (PPAR) is a member of a ... factors that heterodimerize with retinoic acid-like ... the regulation of glucose and lipid ... of anti-diabetic agents called thiazolidinediones (TZD) ...
... This protein identification Service includes 1. ... protein spots 3. High-sensitive tryptic in-gel ... of samples for MALDI-MS 5. Acquisition ... via MALDI-MS (Bruker ultraflex TOF/TOF) 6. ...
... Preparation Reconstitution: one vial contains ... ficoll and 50 mg PVP; ... water yields a 50concentrate Special ... 1.00 g/mL (20 C) Quality ...
Biology Products: