copper (Cu), chemical element, a reddish, extremely ductile metal of Group 11 (Ib) of the periodic table that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature. This native copper was first used (c. 8000 bce) as a substitute ...
Copper definition: a malleable, ductile, metallic element having a characteristic reddish-brown color: used in large quantities as an electrical conductor and in the manufacture of alloys, as brass and bronze. Symbol: Cu; atomic weight: 63.54; atomic num
英[ˈkɒpə(r)] n.铜;铜币;警察 adj.铜(制)的;(紫)铜色的 v.用铜板[铜皮]盖[包] 网络红铜;紫铜;铜制器 复数:coppers 权威英汉双解 英汉 英英 网络释义 copper 显示所有例句 n. 1. [u] 铜a chemical element. Copper is a soft reddish-brown metal used for making electric wires, pipes...
Copper is an essential trace element involved in mitochondrial respiration, antioxidant defense, and neurotransmitter synthesis [5,6]. Copper homeostasis is tightly regulated. Copper excess or deficiency can lead to pathological alterations, and thus negatively affect human health [7]. Copper dyshomeostas...
Copper is an essential trace element with a great importance in industry, environment and biological systems. The great advantage of ion-selective sensors in comparison with other proposed techniques is that they are measuring the free metal ion activity which is responsible for their toxicity. Porphy...
Cu is an essential element in virtually all living organisms, and numerous studies have shown that Cu serves as a cofactor for a variety of key metabolic enzymes that drive a broad range of physiological processes.3,4 Thus, the systemic Cu levels must be maintained within a narrow range to ...
Copper is an essential trace element. Copper-containing enzymes play important roles in iron and catecholamine metabolism, free radical scavenging, and in the synthesis of hemoglobin, elastin and collagen. Copper is mainly present in caeruloplasmin in the liver. Low levels of copper have been assoc...
Copper (Cu) is a transition element, belonging to Group 11 (formerly Group IA) of the Periodic Table. It is an important non-ferrous metal and a micronutrient with two distinct functions - to serve as a plant nutrient by being an activator or by being a part of certain enzymes like tyro...
Copperis a good conductor of heat. 铜是热的良导体. 《简明英汉词典》 Copperwire is flexible. 铜丝易弯曲. 《简明英汉词典》 Brass is an alloy ofcopperand zinc. 黄铜是铜和锌的合金. 《现代英汉综合大词典》 Copperhas less resistance to electricity than lead. ...
Copper is an essential trace element critical for normal human metabolism. Copper deficiency can occur with inadequate copper intake, but excess copper intake may cause toxicity to human. Copper and its alloys are pres- ent in numerous articles of everyday use, such as coinage, tools, jewelry,...