In medical terms, PVC stands for Premature Ventricular Contraction, a condition where the heart experiences extra, abnormal heartbeats originating in the ventricles, which are the heart's lower chambers. These contractions happen earlier than they should, disrupting the heart's normal rhythm. Although PVCs are common and often don't cause significant problems, they can sometimes lead to more severe heart conditions or indicate underlying heart disease. Symptoms might include palpitations or a feeling of skipped heartbeats. Treatment isn’t always necessary but could involve lifestyle changes or medication depending on the frequency of PVCs and any underlying conditions.

Cellulose, a complex carbohydrate and the main constituent of plant cell walls, is indigestible by humans due to the lack of cellulase enzymes. However, certain organisms can digest cellulose, including some bacteria, fungi, and protozoans found in the gut of herbivores like cows, horses, and sheep. These microorganisms break down cellulose into simpler sugars that the host can absorb, providing a crucial energy source. Termites also rely on gut bacteria and protozoans for cellulose digestion. Ruminants, such as cows, have a specialized stomach compartment, the rumen, where microbial fermentation of cellulose occurs. This symbiotic relationship between herbivores and their gut flora is essential for their survival, allowing them to derive energy from plants. Additionally, cellulase-producing bacteria are used in various industrial processes, such as biofuel production, where they help in breaking down plant biomass into fermentable sugars.

When selecting an epoxy for a cutting board, it's crucial to opt for a product that is specifically labeled as “food safe” once fully cured. Many epoxies may claim to be safe for incidental food contact, but for cutting boards that come into direct and frequent contact with food, you need an epoxy that complies with FDA regulations under 21 CFR 175.300, indicating it's safe for direct contact with food. A popular choice among woodworkers and DIY enthusiasts is an epoxy resin that is clear, durable, and has a high resistance to heat and chemicals once cured. Additionally, ensure the epoxy is BPA-free and has low or no VOCs to guarantee safety and minimal environmental impact. Remember to follow the manufacturer's instructions for mixing, application, and curing times to ensure the best results and food safety.