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I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
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When comparing resin and filament for 3D printing, the cost can vary based on several factors such as brand, quality, and volume purchased. Generally, resin tends to be more expensive per kilogram compared to filament. For instance, standard PLA filament can cost around $20-$30 per kilogram, whereas resin often ranges from $40-$60 per kilogram. However, resin's higher price point may be offset by its unique properties, like high detail reproduction and a wider variety of finishing options. Filament, on the other hand, offers ease of use and a lower upfront cost, making it ideal for large-scale prints and beginners. Considering the overall cost, filament is typically cheaper than resin, but the choice between the two depends on the specific application and desired outcome.
Polypropylene glycol (PPG), under most circumstances, shows low acute toxicity in humans. Toxicity levels can vary based on molecular weight and formulation. Generally, ingestion of small amounts (e.g., from cosmetics or pharmaceuticals) is considered to have low toxicity. However, higher doses, especially above 20 grams for an average adult, can lead to symptoms like nausea, vomiting, and diarrhea. It's important to distinguish between PPG and its relatives, like ethylene glycol, which is significantly more toxic. The precise toxic dose can depend on individual health, the specific type of PPG, exposure route, and duration. Chronic exposure or high-dose ingestion necessitates medical evaluation. As with all chemicals, appropriate handling and usage instructions should be followed to avoid adverse effects.
The correct structure for the amino acid proline is unique among the twenty standard amino acids because it contains a side chain that is bonded to the amino group, forming a cyclic compound. This ring structure involves the side chain connecting to the nitrogen atom of the proline molecule, making it an imino acid rather than a true amino acid. The chemical formula for proline is C_5H_9NO_2. Its distinctive cyclic structure leads to proline acting as a structural disruptor in protein secondary structures such as alpha-helices and beta-sheets, often found at the turning points of proteins and playing a crucial role in the folding and stability of proteins. Unlike other amino acids, this cyclic nature restricts the rotational freedom of the N-C bond, influencing the polypeptide chain's direction.
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