Glutamic acid is an amino acid that is used by almost all living things in the biosynthesis of proteins. It is a non-essential nutrient for humans, which means the body can produce enough to meet its requirements. It is also the most abundant excitatory neurotransmitter in vertebrate nervous systems.

Gifts are a medium of social expression, sold through physical and online stores. Novelty items are sold for their uniqueness, while souvenirs are memories of people, places, or events and are also known as mementos or keepsakes.

Geriatric medicine refers to a medical specialty that emphasizes elderly care and their treatment for medical conditions such as diabetes, hypertension, coronary heart disease, stroke, arthritis, and osteoporosis.

A geothermal heat pump is also called a ground source heat pump. The system uses efficient renewable energy technology and is gaining popularity among users in both residential and commercial buildings. Geothermal heat pumps are used in buildings for space cooling and heating, as well as water heating. The main advantage of geothermal heat pumps is that they concentrate naturally on existing heat instead of producing heat from the combustion of fossil fuels.

GMO foods are produced from organisms that have had changes introduced into their deoxyribonucleic acid (DNA) using the process of genetic engineering. In genetic engineering, genes from one organism are transferred to another organism to introduce new characteristics or traits.

Generative artificial intelligence (AI) refers to AI systems that can create or generate new content, such as images, videos, and text, without human intervention. This is achieved using deep learning techniques and their ability to learn and mimic patterns in large amounts of data. Generative AI has numerous applications in creative industries, such as music and art, as well as in industries that require the creation of new content, such as marketing and advertising.

Gastrointestinal (GI) products refer to medical devices used for diagnosing, treating, and managing disorders of the digestive system. These include conditions such as acid reflux, irritable bowel syndrome (IBS), inflammatory bowel disease (IBD), ulcers, and colorectal cancer. GI products encompass endoscopy devices, ablation devices, motility testing devices, and biopsy tools, helping improve digestive health and patient outcomes.

Gasoline, also known as petrol, is a prevalent liquid fuel derived from crude oil through refining processes. It is specifically designed for use in spark-ignition internal combustion engines, commonly found in automobiles, motorcycles, and small aircraft. Gasoline is composed primarily of hydrocarbons with additives to enhance engine performance and reduce emissions. It is highly flammable and volatile, making it suitable for combustion within the cylinders of an engine. Moreover, gasolines widespread availability and efficient energy release make it a preferred choice for transportation and power generation.

A gas turbine, also known as a combustion turbine, is a type of internal combustion engine that converts chemical energy from fuel (generally a variety of gases, such as natural gas, process gas, low-Btu coal gas, and others) into mechanical energy through the process of combustion. Gas turbines are commonly used in different applications, including power generation, aviation, and industrial processes. They operate on the principle of continuous combustion, where fuel (gas) and air are continuously mixed and burned to produce a high-speed and high-energy exhaust gas stream.

A membrane is a type of selective barrier used to remove or separate a feed stream as it passes through. Membranes are generally used for gas separation. Gas separation membranes are used to separate and purify specific components from other gases or vapor mixtures. The gas separation membrane technology is widely used in gas processing applications in different industries, such as petrochemical, chemical, and manufacturing.