"Pterin" Pronounce,Meaning And Examples
"Pterin" Natural Recordings by Native Speakers
"Pterin" Meaning
Pterin refers to any compound that contains the pteridine ring, which consists of a six-membered pyrazine ring fused with a five-membered pyrrole ring.
"Pterin" Examples
Pterin
Examples:
- In organic chemistry, pterins are a type of heterocyclic aromatic compound that is related to the purines and pyrimidines, both of which are significant in biochemistry.
- The carryover is less luminous than other catecholamine turnover end products; perhaps the fluorescence of the corresponding pterins is masked by the gamma; or perhaps turn over of these stores is more slow-rate.
- The drug Synthroid prescribed as a synthetic replacement for thyroxine hormone contains iodine in the form of pterin while the lithium filler such as Croscarmellose-na is an antacid.
- The pigments of the pineal gland are melatonin and the pterins like serotonin and acetylserotonin.
- Other derivatives of serotonin include melatonin, methoxytryptamine (5-methoxytryptamine), which is converted to melatonin by the deamination of a methyl group at the 5-position followed by a pterin cyclization
"Pterin" Similar Words
Pteridophytes
Pteridosperm
Pteridosperm refers to a type of seed fern that lived during the Paleozoic and Mesozoic eras. These plants were also known as "seed ferns" due to their reproductive characteristics, which combined characteristics of ferns and conifers. They were a transitional group of plants that played an important role in the evolution of seed-producing plants (spermatophytes) on Earth.
Pteridospermae
A group of seed ferns that flourished in the Mesozoic and Cenozoic eras, commonly found as fossil impressions and compression fossils in shales and lignites.
Pteridospermaphyta
The Pteridospermophyta is an order of extinct seed ferns that lived during the Permian and Triassic periods, about 270-228 million years ago. They were part of the group of plants known as the pteridosperms or "seed ferns," which were common plants that had evolved from fern-like ancestors but had evolved seeds.<br><br>These plants were characterized by having seed-like ovules, typically enclosed within leaf-like structures, which were often modified into protective structures called cupules. They produced seeds that were dispersed by wind, rather than relying on water or other agents for propagation. Pteridospermophyta had dispersed seeds that were often peltate, with stalks that radiated from a central point, and mechanism suggesting that they might have been leyzed in its lyres shape are recorded.
Pteridospermatophyta
Pteridospermatophyta is an extinct group of seed plants, also known as pteridosperms. They were a type of vascular plant that lived on Earth during the Paleozoic and Mesozoic Eras, around 370-150 million years ago.<br><br>The name Pteridospermatophyta comes from the Greek words "pteron", meaning wing, and "sperma", meaning seed, indicating that these plants were thought to have produced seeds similar to ferns (pteridosperms were related to modern cycads and ginkgos) but had a more terrestrial growth habit.<br><br>Pteridospermatophyta were some of the first plants to evolve seeds, a significant innovation that allowed them to disperse their offspring more effectively and ultimately led to the success of the flowering plant lineage. Some well-known examples of pteridosperms include the genus Matonia, Glossopteris, and Sagenopteris.<br><br>These plants likely grew as large trees or shrubs, had fern-like leaves, and produced cones or cupules to contain their seeds. Their seeds were enclosed in cupules or seed-bearing structures and helped establish the pattern for the modern gymnosperms, which include conifers, cycads, and ginkgos.
Pteridospermopsida
The Pteridospermopsida is a group of extinct seed ferns that were among the earliest plants to produce seeds. They were characterized by their fern-like fronds, which bore seeds in the form of ovules on their leaves, similar to modern conifers. These plants were likely among the precursors to the later evolution of conifers, which are a group of trees and shrubs characterized by cones and scales.
Pterigium
A growth of conjunctiva or other tissue over the cornea, often resulting from rubbing, irritants, or injury.
Pteriidae
Pteriodophyta
Pteridophyta is a division of vascular plants, also known as the cryptogams. They are plants that produce their seeds on the outside of their spores, and are characterized by their non-flowering reproductive structure, such as cones, leaves, and roots.<br><br>In simpler terms, pteridophyta are vascular plants that reproduce by spores rather than seeds, and include ferns, horsetails, and club mosses. They are part of the plant kingdom but differ from flowering plants (angiophyta) in their reproductive system.
Pterion
The term "pterion" refers to a diamond-shaped membrane located in the ear of a bat and some other flying animals, specifically a D-shaped or kite-shaped structure that forms the posterior part of the tragus, and thought to be an important aspect in sound emission in bats and dolphins.<br><br>In human anatomy, particularly in relation to the ear, the term "pterion" can refer to the area in the temporal region (skull area located in front of the ear) from which the temporal fascia is attached. This area is called the "pterion" because, when the temporal fascia is reflected onto the frontal bone, the shape formed resembles a pterion (derived from Greek word "pteros," meaning "wing"). However, this geographical space should be mostly intact for the muscle forces of mastication and facial expression not to become lost for the affected side (facial paralysis).
Pterional
Pterional refers to something that is related to or resembling a pterygium, which is a curved or wing-like structure, often seen in fossils or anatomy.<br><br>In medical contexts, pterional refers to a region on the side of the skull, specifically the area above and behind the orbit (eye socket), near the frontal and temporal bones. This area can be a location for various medical procedures or birthmarks.<br><br>In a broader sense, pterional can describe anything with a wing-like or curved shape, such as a pterional shape in architecture or engineering, which means a curved or wing-like structure, often seen in designs inspired by birds or insects. <br><br>In paleontology, the term pterion is also used to describe the bones on the skull of reptiles that form the wing-like structure in flying dinosaurs (pterosaurs).
Pteris
Pteris is a genus of a fern family, particularly true ferns, and several of its species are called lucky ferns.
Pternohyla
I couldn't find any word or definition for "pternohyla". It's possible that it's a misspelling or a made-up word. Could you provide more context or check if it's a real word in another language?
Pterobranch
Pterobranchia is a subphylum of hemichordates, a group of marine animals that also includes the more familiar acorn worms. They typically live on a substratum in depths ranging from near-surface to more than 4,000 meters.
Pterobranchia
Pterobranchs