Melissa and Jam explore the science behind why sweat is salty. They discuss personal experiences with sweating, the types of sweat glands, and the chemical processes involved in sweat production. The episode explains how osmosis, ion channels, and salt concentrations contribute to the movement of sweat through sweat glands to the skin's surface. They also touch on evolutionary aspects and the role of sweat in cooling the body. For anyone curious about the chemistry of everyday life, this episode offers an accessible and intriguing explanation.

00:00 Introduction: Why is Sweat Salty?
00:27 Personal Experiences with Sweat
01:32 The Science Behind Sweat
02:00 Meet the Hosts
02:20 Types of Sweat Glands
04:30 How Sweat Reaches the Skin
07:31 The Role of Salt in Sweat
14:20 Health Indicators in Sweat
17:01 Understanding Osmosis and Interstitial Fluid
17:39 Evolutionary Perspective on Sweating
20:01 Mechanism of Sweat Glands
22:41 Sweat Composition and Function
27:39 Personal Sweating Experiences
33:47 Supporting the Show and Community

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References from this episode:

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC6773238/
2. https://pubs.rsc.org/en/content/articlehtml/2024/lc/d3lc00874f#cit23
3. https://pubs.acs.org/doi/full/10.1021/acsnano.4c10344

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#050

This week, Melissa and Jam once again look under the armpits of society, this time to explore sweat. Is it cool? Well does it keep us cool? How? At what cost? Is there more to sweat than meets the eye? Can you drink it? Grab your sweat bands and let's hit the track Paulie Bleeker.

References from this episode

1. Flexible and Superwettable Bands as a Platform toward Sweat Sampling and Sensing - Analytical Chemistry - Xuecheng He, Tailin Xu, Zhen Gu, Wei Gao, Li-Ping Xu, Tingrui Pan, and Xueji Zhang
2. A Fully Integrated and Self-Powered Smartwatch for Continuous Sweat Glucose Monitoring - ACS Sensors - Jiangqi Zhao, Yuanjing Lin, Jingbo Wu, Hnin Yin Yin Nyein, Mallika Bariya, Li-Chia Tai, Minghan Chao, Wenbo Ji, George Zhang, Zhiyong Fan, and Ali Javey
3. General Chemistry, Edition 2 - Flowers, Theopold, Langley, Robinson

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In this continuation of our two-part series, Melissa and Jam dive into the intriguing chemistry behind color film and Polaroid photography. The episode picks up from the previous discussion on black and white film, focusing on color theory and how it applies to both traditional and instant photography. Listeners will learn about the science of additive and subtractive colors, how multiple layers of dye-sensitized silver halide work together to capture images, and the unique processes involved in developing these images. For those fascinated by the intersection of chemistry and photography, this episode is a must-listen.

00:00 Introduction and Recap
01:42 Understanding Color Theory
05:08 Additive and Subtractive Colors
07:00 Color Photography Basics
08:45 Film Development Process
13:03 Negative and Positive Images
17:33 Practical Applications and Examples
23:28 Understanding Negative Images in Photography
24:26 Principles of Color Photography
25:22 Exploring Color Negatives and Filters
27:14 Layers and Sensitizers in Color Film
29:51 The Development Process of Color Film
34:22 Introduction to Polaroid Photography
35:20 The Chemistry Behind Polaroid Development
40:06 Fascination with Photography and Color Theory
40:50 Favorite Black and White TV Shows
44:12 Closing Remarks and Community Shoutouts

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References from this episode:

1. https://pubs-acs-org.libproxy.library.unt.edu/doi/epdf/10.1021/ed052p622?ref=article_openPDF
2. https://pubs-acs-org.libproxy.library.unt.edu/doi/10.1021/acs.jchemed.6b00400
3. https://pubs-acs-org.libproxy.library.unt.edu/doi/10.1021/ed081p694
4. https://edu.rsc.org/experiments/making-a-photographic-print-using-silver-chloride/454.article
5. https://www.acs.org/content/dam/acsorg/education/resources/highschool/chemmatters/articlesbytopic/metals%20and%20nonmetals/chemmatters-feb2006-digital-photo.pdf
6. https://www.researchgate.net/profile/Rolf-Steiger/publication/279964154_CHEMICAL_SENSITIZATION_OF_SILVER_BROMIDE/links/5a7d8b55aca272341aef2f6f/CHEMICAL-SENSITIZATION-OF-SILVER-BROMIDE.pdf
7. https://www.acs.org/education/celebrating-chemistry-editions/2024-ncw/chemistry-of-polaroids.html
8. https://cen.acs.org/articles/87/i12/Instant-Film.html
9. https://www.acs.org/education/whatischemistry/landmarks/land-instant-photography.html
10. https://pubs-acs-org.libproxy.library.unt.edu/doi/epdf/10.1021/ed051p72?ref=article_openPDF

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