JoVE Monthly Highlights: October 2017

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Published 10/04/2017
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Iannazzi, A., Navani, D. JoVE Monthly Highlights: October 2017. J. Vis. Exp. (128), e5882, (2017).

Abstract

Here's a look at what's coming up in the October 2017 issue of JoVE: The World's Premier Video Journal.

From the bubbling cauldron of science emerges our first featured article, from JoVE Environment. Here, our Authors demonstrate how to build and deploy double-decker traps to attract and capture emerald ash borers - the most destructive forest insect to invade North America. These traps capture significantly more emerald ash borers than any other trap type in sites with relatively low EAB densities, allowing for effective detection and management of this invasive insect. Even more than giant creepy spiderwebs!

Moving from pests to pets, our next study from JoVE Behavior takes a look at man's best friend. Here, our Authors describe eight different experimental tasks to analyze the relationship between dogs and their owners. The results of this standardized study suggest that owner warmth is the greatest source of behavioral variance - and that dogs belonging to more controlling owners tend to be more aggressive towards strangers. And good doggies get treats...no tricks!

Switching gears, in JoVE Bioengineering this month our Authors use a custom built mechanical testing device to measure the flexural behavior of load bearing biological structures. The successful execution of this three-point bending test on the skeletal elements from marine sponges shows that this method can be used to understand the remarkable mechanical functions of a host of similar structures. That's heavy stuff!

Finally, JoVE Chemistry zooms in on nanoparticle self-assembly processes in real time. Using uniformly sized platinum and lead selenide nanoparticles, our Authors produced liquid cells with silicon or silicon nitride or windows. Liquid-cell transmission electron microscopy analysis reveals that changes in the solvent boundaries, caused by evaporation, affects nanoparticle self-assembly by driving them to form amorphous aggregates. These aggregates then flatten, producing spellbinding two-dimensional self-assembled structures.

You've just had a sneak peek of the October 2017 issue of JoVE. Visit the website to see the full-length articles, plus many more, in JoVE: The World's Premier Video Journal.

Protocol

A Millimeter Scale Flexural Testing System for Measuring the Mechanical Properties of Marine Sponge Spicules

Michael A. Monn, Jarod Ferreira, Jianzhe Yang, Haneesh Kesari

School of Engineering, Brown University

We present a protocol for performing three-point bending tests on sub-millimeter scale fibers using a custom-built mechanical testing device. The device can measure forces ranging from 20 µN up to 10 N and can therefore accommodate a variety of fiber sizes.

The Other End of the Leash: An Experimental Test to Analyze How Owners Interact with Their Pet Dogs

Giulia Cimarelli1,2,3, Borbála Turcsán1,4, Friederike Range1,2, Zsófia Virányi1,2

1Comparative Cognition, Messerli Research Institute, University of Veterinary Medicine of Vienna, Medical University of Vienna, University of Vienna, 2Wolf Science Center, Messerli Research Institute, University of Veterinary Medicine of Vienna, Medical University of Vienna, University of Vienna, 3Department of Cognitive Biology, University of Vienna, 4Research Centre for Natural Sciences, Institute of Cognitive Neuroscience and Psychology, Hungarian Academy of Sciences

This article presents eight different experimental tasks, mirroring the everyday life of dogs and owners, used to analyze how owners interact with their dogs in a standardized way. The tasks included both positive (e.g. play) and negative (potentially stressful) situations (e.g. physical restriction).

Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

Byung Hyo Kim1,2, Junyoung Heo1,2, Won Chul Lee3, Jungwon Park1,2

1Center for Nanoparticle Research, Institute for Basic Science (IBS), 2School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 3Department of Mechanical Engineering, Hanyang University

Here we introduce experimental protocols for the real-time observation of a self-assembly process using liquid-cell transmission electron microscopy.

Building Double-decker Traps for Early Detection of Emerald Ash Borer

Deborah G. McCullough1, Therese M. Poland2

1Department of Entomology and Department of Forestry, Michigan State University, 2Northern Research Station, USDA Forest Service

Effective traps to attract and capture the emerald ash borer (EAB) are a key element of detecting and managing this invasive pest. Double-decker traps, placed in full sun near ash trees, incorporate visual and olfactory cues and were more likely to capture EAB than other trap designs in field trials.

Disclosures

No conflicts of interest declared.

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