The abbreviated structure of the storage polysaccharide starch; just a short segment shown (starch is a long, potentially infinite, polymer of alpha-glucose molecules). Unbranched starch, like the one drawn here, is called amylose. Drawn in Inkscape 生物学 化学 食品 淀粉
A ball-and-stick model structure of acidic (negatively-charged) amino acid glutamic acid (Glu, E). Carbon in blue-grey, oxygen in red, nitrogen in green, hydrogen in silver. Drawn in Inkscape 酸 酸性 氨基 谷氨酸 (氨基酸)
A ball-and-stick model structure of polar amino acid asparagine (Asn, N). Carbon in blue-grey, oxygen in red, nitrogen in green, hydrogen in silver. Drawn in Inkscape 酸 氨基 氨基酸 天冬酰胺 (氨基酸)
Vector illustration of a realistic piece of leather. Small holes covering the surface of the leather object, darker lines with stitches on the top and bottom parts of the image. Free vector illustration for all fashion, accessories, leather goods, style, wallets, purses and clothing design materials projects 背景 家具 平铺 现实的皮革
自由半色调矢量纹理准备将深度添加到您的数码作品。网目调结构是伟大的设计片段,任何的插画师,平面设计师,网站所有者和矢量艺术家。与这些伟大的半色调图形创建独特的海报、 小册子、 包装、 标签、 cd 或 dvd 封面布局 那些 模式 现代 半色调矢量纹理
Vector illustration of styled Decorative urban background. Files included - Vector EPS 8 file, Illustrator 8 file and JPEG included. http://www.vectorsquare.com/vectors/free-vectors 涂鸦 建筑物 横幅 City Design Vector Banner
Concept vector with abstract gear wheels, vector illustration eps-10 做广告 广告 背景 Concept vector with abstract gear wheels
Public Domain Source http://commons.wikimedia.org/wiki/File:Pyridoxine_structure_ver2.svg 化学 吡哆醇 结构 吡哆醇结构
Set of four building vectors under construction. I hope you can use these four building vectors in your projects 卡通 街 城市 Construction Vector Buildings Pack
Free industrial equipment free vector graphics image activity architecture black built bulldozer business cable construction contour contractor coreldraw crane design development elevator equipment exterior vector graphics graphic heavy high illustration illustrator industrial industry isolated 工业设备免费
Public Domain Source http://commons.wikimedia.org/wiki/File:Tc99_sestamibi_2D_structure.svg tc99_sestamibi_2d_structure 化学 TC99 司他米比二维结构
Death and anatomy vector footage of human skeletons. Silhouettes of skeletons of people with different body structure and a skeleton standing on his hands. Free vectors for anatomy, bone structure, bones and death visuals. Graphics for your educational images and adverts 骨 骨骼 剪影 人类骨骼图形
Concept vector with abstract gear wheels, vector illustration eps-10 做广告 广告 背景 Concept vector with abstract gear wheels
Technology vector art illustration of futuristic abstract design elements for your digital art backdrop, business concepts, computer and technology stock footage collection, electrical circuit, geometric shapes, modern layout, techno wallpaper or network graphics 现代 抽象 技术 Technology Structure
Looking for a fun home pattern? This house pattern vector could be used for real estate visiting card design ideas or for backgrounds on real estate websites. Enjoy 城市 镇 房子 Real Estate Home Patterns
Free urban structures design in scalable vector graphics .svg vector and adobe illustrator .ai vector 电缆 建设 电力 Urban Structures
Free free city vector graphics design in encapsulated postscript .eps vector and adobe illustrator .ai vector 体系结构 桥 建筑物 Free City
Download free psychedelic vector graphics, trippy background effects, 60s pop art artworks and swirling images. Pay homage to the psychedelic music and art scene of the Sixties with this groovy vector footage pack with cool circles, swirls and geometric shapes designs 时髦 结构 几何 Psychedelic Graphics
C'est L'amour! A hand drawn illustration of the Eiffel Tower together with 2 cute doves holding a ribbon banner. Download for free and enjoy! It would be great if you leave a comment below and let me know what you think, thanks! Designed exclusively for Vecteezy.com 树木 街 剪影 Free Hand Drawn Eiffel Tower
Abstract gear wheels with light bulb, vector illustration eps-10 做广告 广告 背景 Abstract gear wheels with light bulb