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By:

Dr. Sanjay Joshi

31 August 2024 at 3:05:29 pm

From Polypropylene to Polystyrene: Decoding Plastic Codes

Not all plastics are created equal—codes 5, 6 and 7 show why some materials recycle easily, while others pose serious challenges. I n the earlier parts of this series, we examined the first set of Resin Identification Codes. Let us now continue our exploration of the remaining codes and their uses.   Code no. 5 This code is assigned to products made from polypropylene (PP). It is a highly versatile polymer, widely known for its durability, chemical resistance, and light weight. Polypropylene...

From Polypropylene to Polystyrene: Decoding Plastic Codes

Not all plastics are created equal—codes 5, 6 and 7 show why some materials recycle easily, while others pose serious challenges. I n the earlier parts of this series, we examined the first set of Resin Identification Codes. Let us now continue our exploration of the remaining codes and their uses.   Code no. 5 This code is assigned to products made from polypropylene (PP). It is a highly versatile polymer, widely known for its durability, chemical resistance, and light weight. Polypropylene is commonly used in food containers and textiles, as well as in automotive parts and medical devices. When exposed to high temperatures, it melts rather than burns; hence, it is classified as a thermoplastic. PP is easily mouldable and recyclable, and it offers an excellent strength-to-weight ratio. These properties make it an ideal raw material across many industries. In fact, it is the most commonly used thermoplastic in the world. It is extensively used in medical devices such as syringes, medical vials, petri dishes, pill containers, and specimen bottles. Polypropylene is particularly well-suited to applications that require repeated bending and manipulation without breaking. Examples include hinges on medication pots, lids or caps on shampoo bottles, and various types of plastic bottles and containers. Beyond packaging, PP is also used to manufacture ropes, twine, tape, carpets, upholstery, clothing, and camping equipment. Its waterproof properties make it especially effective for use in the marine sector. Although polypropylene is recyclable, there are certain limitations. Rigid items, such as containers and bottle caps, are easily accepted for recycling, whereas flexible films made from PP are more difficult to recycle. Code no. 6 This code is assigned to products made from polystyrene (PS). Polystyrene is a hard and brittle plastic that may be transparent or opaque. It is available in three distinct forms, each used for different applications. The first type is GPPS (General Purpose Polystyrene ) . This form is commonly used for disposable items such as cups, cutlery, and food trays. It is also used in rigid packaging, cosmetic boxes, toys, lighting diffusers, and laboratory ware. The second type is High Impact Polystyrene (HIPS), which is modified to improve toughness and impact resistance. HIPS is widely used in packaging, retail displays, and signage, as well as in consumer electronics, including housings for televisions, computers, and toys. It also finds applications in automotive interiors, such as trims and panels. The third type is Expanded Polystyrene (EPS). This form is hard and brittle yet extremely lightweight and is more commonly known as 'styrofoam' or 'thermocol' .  EPS is generally used as moulded foam packaging for televisions, computers, household appliances, and other fragile goods. It is also commonly found in trays used for meat, fish, and similar products, as well as in egg cartons. In addition, EPS is used to make disposable items such as cups, plates, bowls, lids, and cutlery, and it is also used as an insulating liner in refrigerators and air conditioners. Technically, polystyrene is 100% recyclable. However, because it is lightweight, bulky, and often contaminated with food residue, recycling it is not economically viable in many regions. The process requires specialised facilities and handling systems, which are not widely available.   Code no. 7 This code is assigned to plastics that do not fall under any of the six categories discussed earlier. It generally includes a broad group labelled as “other” plastics, such as polycarbonates (PC), acrylic, nylon, multilayered composite plastics used in sachets or pouches, and fibreglass composites used in automotive parts, industrial containers, and similar applications. Polycarbonates are commonly used in products that require strength and impact resistance, such as safety goggles and reusable water bottles. Acrylic, also known as Plexiglas, has a wide range of applications and is frequently used in light fixtures, display units, and packaging windows. Nylon is valued for its strength and flexibility and is typically used in products such as toothbrush bristles, gears, and other mechanical components. Because of their complex and mixed compositions, plastics classified under Code 7 are generally not recyclable. Will continue in the next week. Till then, have a nice weekend!   (The author is an environmentalist. Views personal.)

AI in Sperm Sorting: An Unbiased Decision for A Better Outcome

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Artificial Intelligence or AI is revolutionising fertility treatments of the future. The inclusion of AI enhances the accuracy, efficiency, and objectivity of sperm selection, hence potentially improving fertility outcomes by leaps and bounds. Traditionally, sperm sorting through manual methods is subjective to judgments. Processes like centrifugation and swim-up methods are used to separate sperm based on motility and morphology. Although they are effective, they have their limitations, leading to human errors that affect the success rates of fertility treatment. For instance, studies have shown that traditional sperm sorting techniques can have variability in success rates, with reported live birth rates ranging between 15 per cent to 25 per cent per cycle depending on the method and quality of sperm. Hence the introduction of AI helps in maintaining consistency in evaluations of sperm, using the same data set for every sample which leads to better judgments.


Automation and Standardisation- Automation of sperm selection and also introduction of AI in the process have improved the results in ART. AI-assisted sperm selection improves the accuracy in choosing high-quality sperm for fertilisation purposes, and also, pregnancy and live birth rates might be improved. Technologies like Intracytoplasmic Morphologically Selected Sperm Injection along with AI ensure the chances of pregnancies increase by about 10-20 per cent compared to the standard procedures. AI and Automation will decrease time taken to analyze sperm and increase opportunities to select better sperm with DNA integrity for better development and higher success rates in embryo selection. These processes ensure that the sperm selection process follows consistent criteria, reducing variability in outcomes caused by human error.


Analysing Complex Data for Better Outcomes- AI plays a crucial in improving IVF outcomes by analysing complex data and providing tailored recommendations. AI-driven tools and models such as those on SpOvum.ai point towards an opportunity to optimise ovarian stimulation decisions by assessing patient characteristics and follicle growth patterns. A study revealed that the use of AI in IVF improved egg yield and reduced medication costs. AI enables fertility specialists to make data-driven choices, improving overall IVF success rates and streamlining treatment processes.


Reducing Human Error- AI models can continuously learn and refine their performance by being trained on newer data. This adaptability ensures the technology remains unbiased and up-to-date with the latest scientific insights into sperm quality and fertility success rates. Studies have shown that AI-driven sperm sorting can decrease human-related errors by up to 25 per cent, improving sperm selection quality in terms of morphology and motility.


Reduction of Sperm Damage- The new AI-driven sperm sorting techniques also include microfluidic systems that are known to exhibit several advantages over the most commonly used conventional method, which is centrifugation. Traditional centrifugation methods, such as density gradient centrifugation, also cause severe oxidative stress and DNA fragmentation of the sperm because of the very high mechanical forces involved. The AI-infused microfluidic sorting minimises this damage significantly by involving gentler processes that mimic the natural pathway of sperm selection. The studies show that the process of microfluidic sorting decreases DNA fragmentation in sperm, which gives improved opportunities for success for IVF. For example, DNA fragmentation is 20 percent lower in sperm sorted using microfluidic processes than in traditional processing methods.


AI is bound to play an increasingly definitive role in fertility treatments, which will improve the outcomes for couples experiencing infertility.


(The author is a Co-Founder & CEO at SpOvum® Technologies. Views personal.)

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