HOME >> BIOLOGY >> NEWS
How long is a child a child?

With an innovative combination of a novel application of synchrotron imaging, high-resolution microtomography, and developmental analysis, the team reconstructed tooth growth and determined the age at death of a fossil juvenile from Jebel Irhoud, Morocco. This study represents the first non-destructive approach to characterize dental development with a high degree of precision, as synchrotron images reveal microscopic internal growth lines without damage to the specimen. The team found that the Moroccan fossil child showed an equivalent degree of tooth development to living human children at the same age. These findings and other evidence suggest that modern biological, behavioural, and cultural characteristics appeared relatively late in the past six million years of human evolution.

Modern human origins continues to be one of the most hotly debated topics among anthropologists, and there is little consensus about where and when the first members of our species, Homo sapiens, became fully modern. While fossil evidence tells a complex tale of mosaic change during the African Stone Age, almost nothing is known about changes in human life history, or the timing of development, reproductive scheduling, and lifespan. Tooth growth, and most importantly molar tooth eruption age, represents one of the most powerful clues to reconstruct growth processes in fossil humans. By using incremental growth lines in teeth, similar to annual rings in trees, developmental rate and time may be accurately established millions of years after death. Research during the past two decades has shown that early fossil humans (australopithecines and early Homo) possessed short growth periods, which were more similar to chimpanzees than to living humans. However, it unclear when, in and which group of fossil humans, the modern condition of a relatively long childhood arose.

In this study, tooth growth and eruption was examined in one of the earliest representatives of Ho
'"/>

Contact: Sandra Jacob
jacob@eva.mpg.de
49-341-355-0122
Max-Planck-Gesellschaft
13-Mar-2007


Page: 1 2

Related biology news :

1. Adult survivors of childhood leukemia exercise less, worsening high risk for obesity and illness
2. Gene identified for Crohns disease in children
3. Gene discovered for type 1 diabetes in children
4. Key to tackling malaria may lie in bed nets for adults and older children
5. Gene variant increases risk for alcoholism following childhood abuse
6. Cord blood may preserve insulin levels in children with type 1 diabetes
7. Researchers isolate new risk marker for overweight children
8. Study suggests other causes for childhood brain aneurysms
9. Study shows lizard moms dress their children for success
10. Lucky 13 as new gene discovery offers further hope for childhood blindness
11. Call of the child

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:11/7/2018)... ... 2018 , ... NDA Partners Chairman Carl Peck, MD ... experience in clinical trial management, including managing operations and trials focused on oncology ... joined the firm as an Expert Consultant. , Prior to joining NDA ...
(Date:11/6/2018)... (PRWEB) , ... November 06, 2018 , ... uBiome, the ... Biochemistry and Biophysics at the University of California, San Francisco (UCSF) and Co-President of ... a scientific adviser to uBiome since 2013, and we are honored that he is ...
(Date:11/3/2018)... ... November 01, 2018 , ... ... New Challenges and New Opportunities, **Presented by FDAnews**, Dec. 6, 2018 – Kleinfeld, ... , Early bird pricing for Emerging Trends in Medical Device Regulation and Quality ...
Breaking Biology News(10 mins):
(Date:11/13/2018)... ... November 12, 2018 , ... ... stethoscope contamination that two large U.S. studies, published last week, confirm pose a ... Journal of Infection Control (AJIC) conclude that stethoscopes are often improperly or rarely ...
(Date:11/11/2018)... , ... November 09, 2018 , ... Triple W, an ... CES® 2019 Innovation Awards Honoree for DFree ®, the first health tech ... when it’s time to go to the bathroom. The announcement was made during CES ...
(Date:11/7/2018)... ... November 07, 2018 , ... Diversified Technologies, Inc. (DTI) ... the Arizona Center for Algae Technology and Innovation at ASU. Funded by a USDA ... for those involved with algal and predator control applications. , Algae ponds get up ...
(Date:11/5/2018)... ... November 05, 2018 , ... 2Blades has ... Activator Like (TAL) effector code technology for applications in advancing research in epigenetic ... in plants. Since its discovery in 2009, the efficacy of TAL effector-based DNA targeting ...
Breaking Biology Technology:
Cached News: