Topical formulations of water-soluble chitin as a wound healing assistant     

Sung Soo Han 《Fibers and Polymers》2005,6(3):219-223

Water-soluble chitin (WSC) was prepared by carefully deacetylating chitins to about 50% of N-acetyl content. Topical formulations based on WSC were prepared and their effects on wound healing were evaluated on a rabbit ear model. Full-thickness, open skin wounds were made on the ears of rabbits and WSC ointments were embedded in the open wounds. The application of WSC ointments significantly accelerated wound healing and wound contraction. The areas of epithelialization and granulation tissues in WSC ointment group are remarkably larger than those in control group (no treatment) and in placebo group (treated with ointment-base materials). A large number of grown granulation tissues including dense fibroblast deposition were observed under the thickened epithelium of the wound treated with WSC ointments. The number of inflammatory cells in WSC ointment group was significantly decreased compared with those in control and placebo groups, indicating that WSC would give low stimuli to wounds and prevent excessive scar formation. Neovascularization was the most prominent in WSC ointment group. Wound contraction in WSC ointment group was much larger than those in control and placebo groups. Overall results demonstrate that the topical formulation based on WSC is considered to become an excellent dressing as a wound healing assistant.  相似文献   

Deposition of spray drift behind border structures     

M. De Schampheleire  D. Nuyttens  D. Dekeyser  P. Verboven  P. Spanoghe  W. Cornelis  D. Gabriels  W. Steurbaut 《Crop Protection》2009,28(12):1061-1075

Windbreaks present a porous obstacle to the approaching airflow, forcing air to flow through the windbreak at a reduced speed and accelerate over the top. In this research, windbreaks were considered as border structures to mitigate spray drift. Air flows, with an interspace between it, particles are filtered from the flow by deposition on the windbreak. Hence there is a reduction in deposition in the downwind sheltered area (the ‘quiet zone’) behind the windbreak. Peak deposition in the sheltered area can occur at minimum wind speeds. The deposition profiles of spray drift behind various border structures were measured. In the first part, drift tests were performed in a wind tunnel. Artificial screens with various heights and open areas were tested. A row of plastic Christmas trees and natural canopies were also tested. Subsequently, drift experiments were performed under field conditions in a grassland with the artificial screens and a row of Fagus sylvatica trees. The artificial screens reduced spray drift deposition in the sheltered region, but significant deposition peaks were found behind the screens. The natural structures had potential to reduce drift deposition when their height was at least equal to the height of the spray nozzle(s). The drift deposition at short distances behind the natural structures was higher than deposition behind artificial structures, but conversely peaks in deposition in sheltered areas were not created by the natural structures.  相似文献   

麦套春棉对棉花生态环境及生育动态的影响   总被引：4，自引：0，他引：4  

刘锋  孙本普  李秀云  郑宝枝  王峰 《安徽农业科学》2008,36(17):7180-7182

[目的]为扩大麦套春棉生产提供科学依据。[方法]试验设3种处理:麦套春棉覆膜栽培;单作春棉覆膜栽培与单作春棉露地栽培,每处理定健株10棵,每隔4～5d观测一次棉株生长情况。[结果]麦棉共生期,作物层和耕层土壤温度是影响棉苗生长直至中后期发育诸因子中的首要因子。[结论]麦套春棉覆膜栽培能够超过单作春棉露地栽培的产量。  相似文献   

基于UG的木工铣刀CAD系统设计   总被引：1，自引：0，他引：1  

修树东  倪忠进  方亮  陈茂军  俞伟鹏 《林业机械与木工设备》2008,36(1):32-34

以UG为支撑平台,利用Visual C 6.0、SQL Server和UG二次开发工具UG/Open研制开发了现代木工铣刀CAD系统.该系统界面友好,集现有木工铣刀查询、选型、设计计算和三维建模于一体,同时又具备良好的可扩展性和可移植性.实践证明该系统极大地提高了现代木工铣刀的设计效率和精度.  相似文献   

太湖敞水区鱼类群落结构特征和分析   总被引：8，自引：0，他引：8       下载免费PDF全文

邓思明 《水产学报》1997,21(2):135-142

太湖敞水区鱼类群落组成，除人工放流的种类外，河湖洄游性鱼类已基本失，种群数量以湖鲚、银鱼、虾类和小型鲤科鱼类占绝对优势。群落物种多样性指数值表明属温带水域范围，具有明显的年、月变化。  相似文献   

响应面法优化徐香猕猴桃开放式增殖培养基     

李钰媛  辛纳慧  杨莉萍  张驰  张振营  张乃群 《中国果业信息》2023,52(1)

为了降低徐香猕猴桃工厂化生产的成本,提高经济效益,探究徐香猕猴桃开放式培养的最适抑菌剂浓度及培养基配方。以现有的无菌材料,采用单因素试验确定增殖培养基因素的添加范围,并利用响应面法进行优化分析。结果表明,徐香猕猴桃开放式组培增殖培养的最优培养基是：MS+3g/L琼脂+20g/L蔗糖+0.1g/L代森锰锌+0.2mg/LNAA+1.5mg/L6-BA,此时增殖系数为6.539,成活率为93.33%。为徐香猕猴桃开放式培养增殖培养工厂化生产提供参考。  相似文献   

试论城市带状绿地的发展与功能   总被引：9，自引：0，他引：9  

李春涛 《安徽农业科学》2004,32(5):963-968

道路绿带起源于公元前 10世纪古印度 ,中国最早的道路绿带起源于周定王时 (公元前 60 6年～公元前 5 86年 )。在国外从19世纪美国景观之父弗雷德里克·劳·奥姆斯特德 (F·L·Olmsted)开始掀开了绿色休闲、生态型的城市带状绿地建设新篇章。简介了国内外绿道理论发展过程 ,总结了城市带状绿地的概念 ,分析了其功能。  相似文献   

两种牛舍在不同季节对种公牛鲜精品质的影响     

王相根  贺亚南  胡书梅 《中国奶牛》2019,(3):21-23

本文针对河南省鼎元种牛育种有限公司180头采精种公牛的采精情况,分析两种牛舍(开放牛舍和封闭牛舍)在不同季节对种公牛日平均采精量、密度、活力的影响,以便在生产中采取相应的措施改善种公牛饲养管理条件。结果发现,春、秋两季两种牛舍对种公牛采精量、密度、精子活力的影响无显著差异,但总体上开放式牛舍略优于封闭式牛舍。冬季封闭牛舍的种公牛采精量、精子活力显著高于开放牛舍(P<0.05)。因而认为,春秋季开放牛舍更适合种公牛的饲养,冬季封闭牛舍更利于种公牛精子质量的提高。  相似文献   

高山露地番茄品种引进对比试验     

闫妞  赵玉玲  马强  陈坤  张庆社  郝浩浩  尹航  郭曙光 《长江蔬菜》2016,(10):55-57

为筛选出适合济源高山露地越夏栽培的番茄优良新品种,引进4个品种进行比较试验。试验结果表明,综合考虑产量和品质性状,推荐粉之夏作为济源高山露地越夏番茄新品种推广使用。  相似文献   

探析网络环境下我国开放获取期刊的发展     

张华 《计算机与农业》2010,(8):62-65

开放获取期刊（Open Access Journals,OA）是一种论文经过同行评审,网络化的免费期刊,了解开放获取期刊的概念及国内外的研究现况、建立大型的在国际上有广泛影响的OA网络平台,可以加速我国科技文献的全球传播。  相似文献