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撞脸动物盘点美洲驼和羊驼

英语角 2024年第20期 22-23页

作者： samantha 不详

在神奇的自然界中,有许多“撞脸”的动物,让人傻傻分不清楚,因为它们长得实在太像了!秋天姐姐将带大家揭开这些相似动物的神秘面纱,帮助大家了解它们各自的特点。一起来看看它们有哪些不同吧!

关键词：美洲驼动物自然界

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外来物种档案——牛蛙

英语角 2024年第16期 22-23页

作者： samantha 不详

你听说过外来入侵物种吗?它们这些“外来客”给当地的生态系统带来了不小的危害!让我们从认识外来入侵物种开始,一起行动起来,保护环境吧!关于牛蛙牛蛙体大粗壮,体长可达15厘米以上,背部皮肤粗糙。因其叫声洪亮,酷似牛而得名。

关键词：外来入侵物种皮肤粗糙外来物种牛蛙生态系统保护环境

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趣话英语

英语角 2024年第28期 36-39页

作者： samantha 不详

同学们,你们喜欢捉迷藏吗?本期对话发生在Ted和Anne之间,一起来看看他们捉迷藏时发生了什么有趣的故事吧!

关键词：捉迷藏发生有趣

Transforming layered 2D mats into multiphasic 3D nanofiber scaffolds with tailored gradient features for tissue regeneration

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BMEMat(BioMedical Engineering Materials) 2024年第1期2卷 160-179页

作者： S.M.Shatil Shahriar Navatha Shree Polavoram Syed Muntazir Andrabi Yajuan Su Donghee Lee Huy Quang Tran samantha J.Schindler Jingwei Xie Department of Surgery-Transplant and Mary&Dick Holland Regenerative Medicine Program College of MedicineUniversity of Nebraska Medical CenterOmahaNebraskaUSA Eppley Institute for Research in Cancer and Allied Diseases College of MedicineUniversity of Nebraska Medical CenterOmahaNebraskaUSA Department of Mechanical and Materials Engineering University of Nebraska LincolnLincolnNebraskaUSA

Multiphasic scaffolds with tailored gradient features hold significant promise for tissue regeneration applications. Herein, this work reports the transformation of two-dimensional (2D) layered fiber mats into three-dimensional (3D) multiphasic scaffolds using a ‘solids-of-revolution’ inspired gas-foaming expansion technology. These scaffolds feature precise control over fiber alignment, pore size, and regional structure. Manipulating nanofiber mat layers and Pluronic F127 concentrations allows further customization of pore size and fiber alignment within different scaffold regions. The cellular response to multiphasic scaffolds demonstrates that the number of cells migrated and proliferated onto the scaffolds is mainly dependent on the pore size rather than fiber alignment. In vivo subcutaneous implantation of multiphasic scaffolds to rats reveals substantial cell infiltration, neo tissue formation, collagen deposition, and new vessel formation within scaffolds, greatly surpassing the capabilities of traditional nanofiber mats. Histological examination indicates the importance of optimizing pore size and fiber alignment for the promotion of cell infiltration and tissue regeneration. overall, these scaffolds have potential applications in tissue modeling, studying tissue-tissue interactions, interface tissue engineering, and highthroughput screening for optimized tissue regeneration.

关键词： expansion gradients multiphasic scaffolds nanofiber mats tissue regeneration