The question "Are polyethylene bags better than plastic bags?" operates under a misunderstanding, as polyethylene bags *are* a type of plastic bag. Polyethylene, a petroleum-based polymer, is the most common plastic used to make shopping bags. It’s lightweight, durable, and recyclable under the correct facilities, categorised mainly into high-density polyethylene (HDPE) and low-density polyethylene (LDPE), each with different properties. HDPE bags are stronger and more rigid, while LDPE bags are more flexible and resilient. Comparing polyethylene bags to other plastics, like polypropylene, polyethylene generally offers a better balance of strength, flexibility, and recyclability. The environmental impact of polyethylene bags, while concerning, can be mitigated through proper recycling and reuse, highlighting the importance of responsible disposal practices over the choice of material alone.

Inkjet printers work by propelling tiny droplets of ink onto paper to create an image or text. Inside the printer, cartridges filled with liquid ink move back and forth across the paper. The printer's printhead contains hundreds or thousands of tiny nozzles, also known as jets, that are controlled by the printer's microprocessor. When a document or image is sent to the printer, the software translates this into a series of dots. The microprocessor then directs the printhead to create these dots by rapidly heating the ink in the cartridges. This heat causes the ink to expand and be ejected out of the nozzles onto the paper in precise patterns, forming characters and images. The ink then quickly dries upon contact with the paper. Some printers use piezoelectric technology, where a crystal in each nozzle changes shape when electricity is applied, pushing ink out of the nozzle. There are different types of ink used depending on the printer model, including dye-based and pigment-based inks. Dye-based inks are known for their vibrant colors but can fade over time, while pigment-based inks are more durable and resistant to fading.

Quenching with fluorescence dyes refers to a technique used in molecular biology and biochemistry to study nucleic acids and proteins. This method involves the use of fluorescent dyes that can bind to these biological molecules and change their fluorescence properties, often resulting in a decrease in fluorescence intensity, known as "quenching." The quenching effect can occur due to various mechanisms such as Förster resonance energy transfer (FRET) or collisional quenching. Fluorescence quenching can be utilized to measure interactions between molecules, monitor conformational changes, or detect the presence of specific targets in a sample. For example, in DNA melting studies, a fluorescent dye might bind to double-stranded DNA, and as the DNA denatures, the dye is released, leading to quenching. This technique is widely used in real-time PCR, microarray analysis, and other applications where precise detection and quantification are essential.