Hyksos, 15th Dynasty rulers of Ancient Egypt, were an internal takeover

Hyksos, 15th Dynasty rulers of Ancient Egypt, were an internal takeover

Chemical analysis reveals Egypt was a multi-cultural hub for centuries

Hyksos 15th Dynasty
Seal amulet with the name of the Hyksos pharoah Apophis. Credits: The Metropolitan Museum of Art, CC0

The Hyksos, who ruled during the 15th Dynasty of ancient Egypt, were not foreign invaders, but a group who rose to power from within, according to a study published July 8, 2020 in the open-access journal PLOS ONE by Chris Stantis of Bournemouth University, UK and colleagues.

The Hyksos were a foreign dynasty that ruled parts of Egypt between approximately 1638-1530 BCE, the first instance of Egypt being ruled by individuals of a foreign origin. The common story is that the Hyksos were invaders from a far-off land, but this idea has been drawn into question. Archaeological evidence does link Hyksos culture with an origin in the Near East, but exactly how they rose to power is unclear.

In this study, Stantis and colleagues collected enamel samples from the teeth of 75 humans buried in the ancient Hyksos capital city of Tell el-Dab'a in the northeast Nile Delta. Comparing ratios of strontium isotopes in the teeth to environmental isotope signatures from Egypt and elsewhere, they assessed the geographic origins of the individuals who lived in the city. They found that a large percentage of the populace were non-locals who immigrated from a wide variety of other places. This pattern was true both before and during the Hyksos dynasty.

This pattern does not match the story of a sudden invasion from a single far-off land, but of a multi-cultural region where one internal group - the Hyksos - eventually rose to power after living there for generations. This is the first study to use archaeological chemistry to address the origins of the Hyksos rulers, but the authors note that more investigations and broader chemical techniques will be needed to identify the specific ancestries of the Hyksos and other non-local residents of Egypt.

Stantis adds: "Archaeological chemistry, specifically isotopic analysis, shows us first-generation migration during a time of major cultural transformations in ancient Egypt. Rather than the old scholastic theories of invasion, we see more people, especially women, migrating to Egypt before Hyksos rule, suggesting economic and cultural changes leading to foreign rule rather than violence."

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Egypt pigment Egyptian blue

A pigment from ancient Egypt to modern microscopy

A pigment from ancient Egypt to modern microscopy

Göttingen research team produces new nanosheets for near infrared imaging

Egypt pigment Egyptian blue
Egyptian blue: the researchers obtained the nanosheets from this powder. Credits: University of Göttingen

Egyptian blue is one of the oldest manmade colour pigments. It adorns, for instance, the crown of the world famous bust of Nefertiti. But the pigment can do even more. An international research team led by Dr Sebastian Kruss from the Institute of Physical Chemistry at the University of Göttingen has produced a new nanomaterial based on the Egyptian blue pigment, which is ideally suited for applications in imaging using near infrared spectroscopy and microscopy. The results have been published in the journal Nature Communications.

Microscopy and optical imaging are important tools in basic research and biomedicine. They use substances that can release light when excited. Known as "fluorophores", these substances are used to stain very small structures in samples, enabling clear resolution using modern microscopes. Most fluorophores shine in the range of light visible to humans. When using light in the near infrared spectrum, with a wavelength starting at 800 nanometres, light penetrates even deeper into tissue and there are fewer distortions to the image. So far, however, there are only a few known fluorophores that work in the near infrared spectrum.

The research team has now succeeded in exfoliating extremely thin layers from grains of calcium copper silicate, also known as Egyptian blue. These nanosheets are 100,000 times thinner than a human hair and fluoresce in the near infrared range. "We were able to show that even the smallest nanosheets are extremely stable, shine brightly and do not bleach," says Dr Sebastian Kruss, "making them ideal for optical imaging."

The scientists tested their idea for microscopy in animals and plants. For example, they followed the movement of individual nanosheets in order to visualise mechanical processes and the structure of the tissue around cell nuclei in the fruit fly. In addition, they integrated the nanosheets into plants and were able to identify them even without a microscope, which promises future applications in the agricultural industry. "The potential for state-of-the-art microscopy from this material means that new findings in biomedical research can be expected in the future," says Kruss.

Egypt pigment Egyptian blue
Near-infrared image of nanosheets taken from a plant. Credits: University of Göttingen

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The study involved scientists from the Institute of Physical Chemistry, the Third Institute of Physics, the Department of Developmental Biochemistry and the Institute of Geology as well as the Department of Dermatology, Venereology and Allergology of the University Medical Center Göttingen and the University of California Riverside.

Original publication: Selvaggio et al. "Exfoliated near infrared fluorescent silicate nanosheets for (bio)photonics". Nature Communications, DOI: 10.1038/s41467-020-15299-5

See also - https://www.nature.com/articles/s41467-020-15299-5

 

 

Press release "A pigment from ancient Egypt to modern microscopy" from the University of Göttingen