科学英语：DNA分子未来可用于培养组织与器官.docxVIP

DNA1 molecules2 provide the source code for life in humans, plants, animals and some microbes. But now researchers report an initial study showing that the strands3 can also act as a glue to hold together 3-D-printed materials that could someday be used to grow tissues and organs in the lab. This first-of-its-kind demonstration4 of the inexpensive process is described in the brand-new journal ACS Biomaterials Science Engineering. Andrew Ellington and colleagues explain that although researchers have used nucleic acids such as DNA to assemble objects, most of these are nano-sized -- so tiny that humans cant see them with the naked eye. Making them into larger, visible objects is cost-prohibitive. Current methods also do not allow for much control or flexibility5 in the types of materials that are created. Overcoming these challenges could potentially have a big payoff -- the ability to make tissues to repair injuries or even to create organs for the thousands of patients in need of organ transplants. With this in mind, Ellingtons group set out to create a larger, more affordable6 material held together with DNA.The researchers developed DNA-coated nanoparticles made of either polystyrene or polyacrylamide. DNA binding7 adhered these inexpensive nanoparticles to each other, forming gel-like materials that they could extrude8 from a 3-D printer. The materials were easy to see and could be manipulated without a microscope. The DNA adhesive9 also allowed the researchers to control how these gels came together. They showed that human cells could grow in the gels, which is the first step toward the ultimate goal of using the materials as scaffolds for growing tissues.词汇表：1 DNA (缩)deoxyribonucleic acid 脱氧核糖核酸参考例句：DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。2 molecules 分子( molecule的名词复数 )参考例句：The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。Inside the reactor t