Date Published: 5/01/2017, Issue 123
Keywords: This Month in JoVE, Issue 123,
Chamberlain, N., Kolski-Andreaco, A. May 2017: This Month in JoVE. J. Vis. Exp. (123), e5839, (2017).
Here's a look at what's coming up in the May 2017 issue of JoVE: The World's Premier Video Journal
Mindfulness is at the heart of our first featured article this month, from JoVE Behavior. Here, our Authors use a combination of electroencephalography*(EEG) and electrocardiography*(ECG) to investigate traditional spiritual stress-reduction techniques. Examining the EEG and ECG's of participants before and after an 8-week Mindfulness-based Stress Reduction course, the authors recorded changes in the wavelet entropy of these data based on the training level or meditation type used. This provides a quantifiable methodology for the study of the effects of mindfulness training on the links between the brain and the heart.
This slides nicely into our next highlighted article on another heart- and brain- healthy subject - fish oils. In JoVE Chemistry, our Authors present a protocol for the rapid evaluation of the lipid profiles in fish oil supplements. Using high resolution Nuclear Magnetic Resonance spectroscopy, individual fatty acids can be identified, as well as their positional distribution on the glycerol backbone. This method is a powerful analytical tool for the screening encapsulated supplements, and can help protect consumers from any "fishy" products...
From wellness and fish oils to well-oiled fish, our next article in JoVE Biology looks at the effects of alcohol exposure on zebrafish. To investigate Alcoholic Liver Disease (ALD)*, our Authors exposed zebrafish larvae to acute ethanol treatment, and then visualized their livers using a specifically optimized Hematoxylin and Eosin (H&E)* staining protocol. The authors show that steatosis and swelling of the hepatic blood vessels is apparent after just 24 hours of exposure to high ethanol levels. This versatile protocol can also be applied to other models of toxin- and virus-induced injury in the increasingly used zebrafish liver model.
Finally this month, let's chill out with a novel freezing method from JoVE Biology. Here, our Authors present time-resolved electron microscopy, dubbed "flash-and-freeze", which gives a snapshot of membrane dynamics on the order of milliseconds and nanometers. The "flash" is an optogenetic stimulation of neuronal activity, and induces neurotransmitter release. A high-pressure "freeze" then swiftly preserves the cells at the resultant stages, allowing researchers to follow morphological changes after synaptic transmission. That's super cool!
You've just had a sneak peek of the May 2017 issue of JoVE. Visit the website to see the full-length articles, plus many more, in JoVE: The World's Premier Video Journal.
Hin Hung Sik1, Junling Gao1,2, Jicong Fan1, Bonnie Wai Yan Wu1, Hang Kin Leung1, Yeung Sam Hung2
1Centre of Buddhist Studies, The University of Hong Kong, 2Department of Electrical and Electronic Engineering, The University of Hong Kong
This manuscript describes how to use the wavelet entropy index to analyze high-density electroencephalography (EEG) and electrocardiography (ECG) data. We show that the irregularity of cerebral and cardiac activities became more coordinated during mindfulness-based stress reduction practice.
Neerajha Nagarajan*1, Merrel T. Holley*2, Christian Danielson2, Kidong Park2, Pinar Zorlutuna1
1Department of Aerospace and Mechanical Engineering, Bioengineering Graduate Program, University of Notre Dame, 2Division of Electrical and Computer Engineering, Louisiana State University
In this study, a biological actuator and a self-stabilizing, swimming biorobot with functionalized elastomeric cantilever arms are seeded with cardiomyocytes, cultured, and characterized for their biochemical and biomechanical properties over time.
Kathryn Williamson1, Emmanuel Hatzakis1,2
1Department of Food Science and Technology, The Ohio State University, 2Foods for Health Discovery Theme, The Ohio State University
Here, high-resolution 1H and 13C Nuclear Magnetic Resonance (NMR) spectroscopy was used as a rapid and reliable tool for quantitative and qualitative analysis of encapsulated fish oil supplements.
Shuo Li*1,2, Sumana Raychaudhuri*1, Shigeki Watanabe1,3
1Department of Cell Biology, Johns Hopkins School of Medicine, 2Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, 3Solomon H. Snyder Department of Neuroscience, Johns Hopkins School of Medicine
We developed a novel technique in electron microscopy, "flash-and-freeze," that enables the visualization of membrane dynamics with ms temporal resolution. This technique combines the optogenetic stimulation of neurons with high-pressure freezing. Here, we demonstrate the procedures and describe the protocols in detail.
No conflicts of interest declared.