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TOP
DarrenLizzie
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
Industry info
Wiki
Q&A
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Q
what is the d amino acid
MyraLucas
DarrenLizzie
Release Time:
July 13, 2024, 9:41 AM
D-amino acids are the mirror images of L-amino acids, which are more prevalent in nature and are the building blocks of proteins. The “D” and “L” refer to the arrangement of atoms around a central carbon, determining the molecule’s direction of rotation. Most living organisms primarily use L-amino acids for protein synthesis. However, D-amino acids are found in some peptides with antimicrobial properties, in the cell walls of bacteria, and as regulatory molecules in humans and other animals. The study of D-amino acids is important for understanding bacterial resistance, developing new antibiotics, and investigating human physiology.
0
Q
why not use gorilla glue on polypropylene
BerylGaskell
DarrenLizzie
Release Time:
July 13, 2024, 1:06 AM
Using Gorilla Glue on polypropylene is ineffective because of the material’s low surface energy, which makes adhesion difficult. Polypropylene is a type of plastic known for its resistance to chemicals, water, and glues, including types like Gorilla Glue. This resistance is due to the molecular structure of polypropylene, which does not allow most adhesives to penetrate its surface easily. For bonding polypropylene, specialized adhesives designed to cope with its unique properties are required, such as those that can chemically react with the surface to create a strong bond. Therefore, for successful adhesion, it’s advisable to seek out glues specifically marketed as compatible with polypropylene or plastic repair adhesives that can deal with its non-stick nature.
0
Q
who invented p.e
ClaireLambert
DarrenLizzie
Release Time:
June 24, 2024, 3:33 PM
Physical Education (P.E.) cannot be attributed to a single inventor, as it has roots dating back to ancient civilizations such as Greece, China, and Rome, where physical fitness was highly valued for military preparation and general health. However, the modern concept of P.E. as part of the educational curriculum started to take shape in the 19th century. In Europe, particularly Denmark, Germany, and Sweden, physical education programs were developed to incorporate gymnastics and exercises into the school curriculum. Friedrich Ludwig Jahn, known as the father of gymnastics, played a significant role in this movement by popularizing gymnastics in Germany in the early 1800s. Meanwhile, in England, the concept of physical education took a different trajectory, focusing more on sports and games. Eventually, these European models influenced physical education in the United States, where it became a standard part of the educational system by the early 20th century.
0
Q
highest fiber beans
BurgessPound
DarrenLizzie
Release Time:
June 1, 2024, 4:02 AM
Beans are an excellent source of dietary fiber, essential for maintaining a healthy digestive system, controlling blood sugar levels, and aiding in weight management. Among the beans, the highest fiber content can be found in Navy beans, offering around 19 grams of fiber per cup when cooked. Following closely are small white beans, yellow beans, and adzuki beans, all providing substantial amounts of fiber. Another excellent source is black beans, with about 15 grams of fiber per cup. Including these beans in your diet can significantly contribute to your daily fiber intake, promoting digestive health and potentially lowering the risk of chronic diseases. It’s also worth noting that cooking beans properly is crucial for maximizing nutrient absorption and reducing anti-nutrients.
0
Q
how is low density polyethylene made molecule
EnidEmerson
DarrenLizzie
Release Time:
May 29, 2024, 7:50 AM
Low Density Polyethylene (LDPE) is synthesized using the free radical polymerization process. This involves the polymerization of ethylene (C2H4) under high pressure (1000-3000 atm) and temperatures between 80 to 300°C in the presence of a peroxide initiator. The process, pioneered in the 1930s, creates a polyethylene with a less uniform (branched) molecular structure compared to High Density Polyethylene (HDPE). These branches prevent the polymer chains from packing closely, resulting in a material that is less dense, more flexible, and has a lower melting point. The unique properties of LDPE, such as its flexibility and resistance to moisture, make it ideal for applications including plastic bags, containers, and film wrapping.
0
Q
how much polypropylene is created a year
FlorenceFreeman
DarrenLizzie
Release Time:
May 12, 2024, 3:57 PM
Polypropylene, a thermoplastic polymer widely used in various industries including packaging, textiles, automotive components, and consumer products, is one of the most produced plastics globally. As of the latest data, global production of polypropylene is estimated to be between 70 to 80 million metric tons per year. This figure highlights the material’s ubiquitous nature and its critical role in modern manufacturing and consumer goods. The production volume is a testament to polypropylene’s versatility, cost-effectiveness, and recycle-ability, making it a preferred choice for a wide range of applications. However, its extensive production and use also raise environmental concerns, particularly regarding plastic waste and recycling challenges, prompting ongoing research into more sustainable production methods and recycling technologies.
0
Q
polypropylene in the human body
SolomonMilton
DarrenLizzie
Release Time:
May 9, 2024, 8:31 AM
Polypropylene is a versatile plastic widely used in various medical devices and surgical procedures due to its unique properties, such as chemical resistance, flexibility, and strength. For instance, it is commonly used in the manufacturing of surgical meshes, sutures, and even some joint replacement components. Its presence in the human body, as part of these medical devices, is generally considered safe, with a low risk of adverse reactions. However, it’s crucial that these devices are made to the highest standards to minimize potential complications such as infection or rejection by the body’s immune system. The long-term effects of polypropylene in the body are an area of ongoing research, but current evidence supports its safety and efficacy in numerous medical applications.
0
Q
how to keep a pipe lit
CathyBell
DarrenLizzie
Release Time:
May 6, 2024, 6:00 AM
Keeping a pipe lit involves a combination of proper packing, tamping, and lighting techniques. Start by filling your pipe with tobacco, employing the “three-layer method” — fill the bowl loosely with tobacco, then press it down to about half its initial volume. Repeat this step, pressing the second layer down to two-thirds, and finally, top off with a third, lightly tamped layer. This creates airflow channels that are essential for an even burn. Light the tobacco with a soft flame, moving in a circular motion to evenly char the surface. After the “charring light,” tamp the charred tobacco gently and relight if necessary. This initial phase might require a few relights. Throughout the smoking process, maintain a slow, steady draw and tamp lightly when needed to ensure ash doesn’t block the airflow. The key is a balanced draw, neither too strong to overheat the tobacco nor too gentle to let it extinguish. Regular practice and patience are essential for maste...
0
Q
advanced injection molding machine supplier
FrancesHamilton
DarrenLizzie
Release Time:
May 4, 2024, 4:04 AM
When searching for an advanced injection molding machine supplier, it’s crucial to prioritize quality, innovation, and after-sales service. A premier supplier in the industry is Engel, renowned for their high-performance and energy-efficient machinery designed for precision across various applications, including automotive, medical, and consumer goods manufacturing. Another standout is Husky Injection Molding Systems, particularly celebrated for their high-speed machines and expertise in producing packaging materials and medical devices. Sumitomo (SHI) Demag excels in all-electric injection molding technology, offering high speed and precision with lower energy consumption. When choosing a supplier, consider the specific requirements of your applications, the machine’s energy efficiency, precision, and after-sales support. Also, evaluate the supplier’s ability to provide custom solutions and their track record for innovation.
0
Q
health dangers of polypropylene
MortonHenrietta
DarrenLizzie
Release Time:
May 1, 2024, 7:59 AM
Polypropylene is a highly versatile and durable material that sees wide usage in packaging. textiles. and various consumer goods. In general. it is considered safe for use and does not typically leach chemicals under normal circumstances. However. caution should be exercised when subjecting it to heat or decomposition. At high temperatures. polypropylene can release harmful substances. although the risk is lower compared to other plastics. Furthermore. the production of polypropylene carries potential environmental and health hazards due to exposure to chemicals. Additionally. microplastics from polypropylene products can accumulate in the environment and indirectly impact health through the food chain. To minimize this risk. we recommend refraining from microwaving polypropylene containers and promoting recycling and proper waste disposal methods.
0
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