# evol-ethno: the fuzzy dispersal and interaction dynamics of ancient (early) nomads (2)

AA << present the genome of 'Denisova 11', a bone fragment from Denisova Cave (Russia)3 and show that it comes from an individual who had a Neanderthal mother and a Denisovan father. >>

<< The finding of a first-generation Neanderthal–Denisovan offspring among the small number of archaic specimens sequenced to date suggests that mixing between Late Pleistocene hominin groups was common when they met. >>

Viviane Slon, Fabrizio Mafessoni, et al. The genome of the offspring of a Neanderthal mother and a Denisovan father. Nature. Aug 22, 2018. doi: 10.1038/s41586-018-0455-x

https://www.nature.com/articles/s41586-018-0455-x

Marlowe Hood. Neandertal mother, Denisovan father-Newly-sequenced genome sheds light on interactions between ancient hominins. Aug 22, 2018.

https://m.phys.org/news/2018-08-neandertal-mother-denisovan-fathernewly-sequenced-genome.html

Also

the fuzzy dispersal and interaction dynamics of ancient (early) nomads. Dec 11, 2017.

https://flashontrack.blogspot.com/2017/12/evol-ethno-fuzzy-dispersals-and.html

# astro: when an unlucky star ventures close enough to a black hole, it spaghettifies ...

<< To be disrupted, an unlucky star must venture close enough to a black hole that gravitational tides exceed the internal gravity that binds the star together. In other words, the difference in the black hole's gravitational pull on the near and far sides of the star, along with the inertial pull as the star swings around the black hole, stretches the star out into a stream. "Basically it spaghettifies," >> James Guillochon

Joshua Sokol. Star-Swallowing Black Holes Reveal Secrets in Exotic Light Shows. August 8, 2018.

https://www.quantamagazine.org/star-swallowing-black-holes-reveal-secrets-in-exotic-light-shows-20180808/

# behav: strange "sunk cost" behaviors: to repeat the wrong choice

<< In a temporal context, a sensitivity to sunk costs arises when an individual resists ending an activity, even if it seems unproductive, because of the time already invested. In two parallel foraging tasks [AA] found that mice, rats, and humans show similar sensitivities to sunk costs in their decision-making. >>

Brian M. Sweis, Samantha V. Abram, et al. Sensitivity to "sunk costs" in mice, rats, and humans. Science  Jul 13, 2018; 361 (6398): 178-81 doi: 10.1126/science.aar8644

http://science.sciencemag.org/content/361/6398/178

Krystle Barbour. Sticking with the wrong choice. University of Minnesota Medical School. July 13, 2018.

https://m.phys.org/news/2018-07-wrong-choice.html

# drugs: proteins found in tick saliva (Rhipicephalus and Amblyomma) to treat a potentially fatal form of heart disease

<< Tick saliva contains proteins [evasins] that suppress chemokine-driven inflammation by binding and neutralizing multiple chemokines simultaneously, helping them to suck blood for several weeks without eliciting inflammation. >>

Kamayani Singh, Graham Davies, et al.  Yeast surface display identifies a family of evasins from ticks with novel polyvalent CC chemokine - binding activities. Scientific Reports. Jun 27, 2017; 7 (4267).

https://www.nature.com/articles/s41598-017-04378-1

AA << has identified several new tick evasins and shown that one of them, P991_AMBCA, from the cayenne tick found in the Americas, can bind to and block the effect of chemokines which cause inflammation in myocarditis, heart attack and stroke. >>

From bug to drug - tick saliva could be key to treating heart disease. University of Oxford. Jun 27, 2017.

https://m.phys.org/news/2017-06-bug-drugtick-saliva-key-heart.html

Also: "saliva" in:

https://flashontrack.blogspot.com/search?q=saliva

https://inkpi.blogspot.com/search?q=saliva

# drugs: from a slug (A. subfuscus) mucus: strong adhesives for wet surfaces

<< Adhesives that can bond strongly to biological tissues would have broad applications ranging from tissue repair and drug delivery to wound dressings and biomedical devices. However, existing tissue adhesives are far from ideal. >>

<< Achieving high adhesion energy requires the synergy of two effects. First, the adhesive should form strong bonds with the substrate. Second, materials inside either the adhesive or the substrate (or both) should dissipate energy by hysteresis. Tissue adhesives must also show compatibility with body fluids, as well as with cells and tissues. >>

AA << report the design of a family of tough adhesives for biological applications to meet those requirements. The design is inspired by a defensive mucus secreted by slugs (Arion subfuscus) that strongly adheres to wet surfaces. >>

J Li, AD Celiz, et al. Tough adhesives for diverse wet surfaces. Science  Jul 28, 2017; 357 (6349): 378-81. doi: 10.1126/science.aah6362

http://science.sciencemag.org/content/357/6349/378 

Sticky when wet: Strong adhesive for wound healing. Slug-inspired, flexible medical bio-glue sticks to wet surfaces without toxicity. Wyss Institute for Biologically Inspired Engineering at Harvard. July 27, 2017.

https://www.sciencedaily.com/releases/2017/07/170727141508.htm

# phyto: photosynthesis also occurs through far-red light

AA << studied photosystem complexes from cyanobacteria grown in the presence of far-red light. >>

<< Kinetic measurements demonstrated that far-red light is capable of directly driving water oxidation, despite having less energy than the red light used by most photosynthetic organisms. >>

Dennis J. Nurnberg, Jennifer Morton, et al.  Photochemistry beyond the red limit in chlorophyll f - containing photosystems. Science. Jun 15, 2018: 360 (6394): 1210-3. doi: 10.1126/science.aar8313

http://science.sciencemag.org/content/360/6394/1210

Hayley Dunning. New type of photosynthesis discovered. Imperial College London. Jun 14, 2018.

https://m.phys.org/news/2018-06-photosynthesis.html

# phyto: a molecular compass to coordinate growth

<< Using this protein [protein BASL: Breaking of Asymmetry in the Stomatal Lineage] to detect the polarity field is like switching a light on in each cell across the tissue. It allows us to see that these cells all have a compass, pointing in the same direction across the leaf >>

<< In this way we will find out if, as we suspect, this molecular compass is a conserved mechanism in the development of plant shapes across the plant kingdom which could be co-opted in different ways by different branches of evolution. >> Catherine Mansfield.

Adrian Galvin. Leaves possess a molecular compass. John Innes Centre. Aug 21, 2018

https://m.phys.org/news/2018-08-molecular-compass.html 

Catherine Mansfield, Jacob L. Newman, et al. Ectopic BASL Reveals Tissue Cell Polarity throughout Leaf Development in Arabidopsis thaliana. Current Biology. 28 (16): 2638-46.E4 Aug 20, 2018 doi: 10.1016/j.cub.2018.06.019

https://www.cell.com/current-biology/fulltext/S0960-9822(18)30810-8