半导体激光照射对犬创伤愈合的影响

用本地杂种犬１２只分为两组，在背部两侧定边长２ｃｍ的正方形皮肤全层缺损创，对照组左侧作为划体对照，每天对创面愈合情况进行观察记录。结果表明：砷化镓激光照射可促进犬全层皮肤缺损创的愈合，但差异不显著，而对激光照射７天内的愈合速度有显著的促进作用。     

蚕茧的激光荧光光谱研究

<正> 用普通紫外灯作激发光源,以肉眼作直接观察是人们长期以来研究蚕茧荧光色的主要手段。虽然这种方法方便而迅速,但因裸眼的判断较为粗糙甚至因人而异,结果难以比较。藤本等(1960)利用分配层析对茧的色素进行了研究,得到几种荧光性物质,但这种研究法必须使荧光性物质脱离原来的状态进入新的环境,且用常规浸提法也很难得到一粒茧的全部荧光物质,使其在反映茧荧光真实情况上亦存在局限。周志康、伍永瑜等(1987)测定了家蚕茧的激光荧光光谱,对光谱的有关参数和遗传特征进行了初步分析。本文进一步对家蚕激光荧光光谱进行了研究,报道于后。     

激光熔覆Ni基合金/碳化物涂层组织及冲刷腐蚀磨损性能

在2Cr13马氏体不锈钢基材上激光多道搭接熔覆Ni—Cr3C2和Ni—WC复合涂层,考察两种激光熔覆层的微观组织、显微硬度对冲刷腐蚀磨损性能的影响,并与不锈钢基材对比。试验结果表明,两种涂层具有不同的凝固组织特征。含有未完全溶解WC硬质相的Ni—WC涂层比Cr3C2硬质相完全溶解的Ni—Cr3C2双相涂层的显微硬度高出约300HV,两种激光涂层的冲刷腐蚀磨损速率分别比不锈钢基材降低30％和60％。冲刷腐蚀磨损抗力的提高与熔覆层的组织状态、碳化物种类和数量以及涂层的韧化性能等因素密切相关。     

大剂量激光,免疫抑制剂及两者配合对大鼠细胞免疫的影响

应用３９．７２４５Ｊ／ｃｍ＾２的Ｈｅ－ＮＥ激光连续１４ｄ照射健康大鼠脊背正中线皮肤、并同时分别与亚剂量的免疫抑制剂环孢霉素、硫唑嘌呤配合，观察它们对大鼠Ｔ，Ｂ淋巴细胞数、淋巴细胞转化刺激指数、１０６个淋巴细胞ＣＰＭ数的影响，结果表明：大剂量激光和Ａｚａ及激光与二者配合均可使淋巴细胞转化刺激指数在试验后４周内较试验前明显降低。     

Nd:YAG Laser Treatment of a Vestibulovaginal Varicosity in a 15-Year-Old Pregnant Mare

A 15-year-old, pregnant Dutch Warmblood mare was exhibiting intermittent hemorrhage secondary to a large vestibulovaginal varicosity. The vessel was reduced with transendoscopic Nd:YAG laser photocoagulation. This technique is minimally invasive compared with traditional surgical ligation, and significantly decreases the risk of severe hemorrhage, especially with advancing pregnancy. One laser treatment resulted in complete reduction in vessel size and allowed the pregnancy to continue to term without incident or further vaginal hemorrhage.     

半导体激光照射创面对犬细胞免疫机能的影响

用本地杂种犬１２只分为两组，在背部两侧各造一边长为２ｃｍ的正方形皮肤全层缺损创。实验组左侧用激光照射，对照组不照射作为对照。结果：砷化镓激光照射创面可显著提高犬外周血液中ＡＮＡＥ阳性淋巴细胞数量，对淋巴细胞转化率有增高的趋势。     

Impacts of connexin 43 degradation on conduction velocity during acute myocardial ischemia

AIM:To study the impacts of the myocardial connexin 43 degradation on conduction velocity during acute myocardial ischemia.METHODS: Studies were carried out in 16 dogs which were randomly divided into control group(n=4) and ischemia group(n=12). The acute myocardial ischemia was induced by ligation of the left anterior descending coronary artery. The conduction velocity of ischemic myocardium was determined. The content of Cx43 of the ischemic myocardium was examined by laser confocal microscopy with a double-label immunohistochemistry technique. RESULTS:(1)The Cx43 degraded rapidly during acute myocardial ischemia, and the conduction velocity of ischemic myocardium declined greatly; (2)The conduction velocity correlated positively with the Cx43 pixel density in each small region of ischemic myocardium; (3) The Cx43 pixel density decreased over 50% in the region which occuring permanent conduction block.CONCLUSION: These data suggest the degradation of Cx43 decreases the conduction velocity greatly during acute short time myocardial ischemia, and severe degradation of Cx43 would lead to permanent conduction block.     

梨自花及异花授粉对其花柱自发荧光的影响

 利用激光共聚焦显微技术研究了砂梨(Pyrus serotina Rehd．)品种‘丰水’ 自花授粉和异花(‘二十世纪’)授粉16 h后花柱自发荧光的分布规律。发现未授粉花柱整体的自发荧光比较弱。但从柱头端向子房端花柱自发荧光呈上升趋势;异花授粉和自花授粉后花柱整体的自发荧光都有所增加;授粉后自发荧光变化最大的部位在柱头区域; 自花授粉后,在柱头及距柱头0～400an范围内荧光值较高,其他区域的荧光值相近;而异花授粉后在花柱的中部(距柱头1500～2050an范围内)荧光值最低; 自花授粉后自发荧光除柱头以外主要分布在花柱的边缘区域;异花授粉后自发荧光在花柱上半部的分布情况与自花授粉类似,下半部分布相对均匀。关键词：中图分类号： 文     

极化干涉SAR森林冠层高反演的地形坡度改正

极化干涉SAR森林冠层高反演是当前SAR领域研究的热点。经典的森林冠层高反演算法主要基于随机地表二层相干散射模型(Random Volume over Ground,RVo G),该模型在山区受到植被层下地表的地形坡度影响,反演精度存在较大误差。为了提高森林冠层高反演精度,采用地形坡度改正的S-RVo G(Sloped Random Volume over Ground)模型,结合三阶段算法,应用德国宇航局DLR提供的星载Tan DEM-X全极化干涉数据反演森林冠层高,并对结果进行验证。结果表明:坡度级为II、III级,RVo G模型反演效果接近于S-RVo G模型;坡度级为IV级,RVo G模型与二调平均树高的相关关系明显下降,加权相对误差和RMSE增大;S-RVo G模型与二调平均树高保持显著相关关系,反演误差同比小于RVo G模型。因此,S-RVo G模型一定程度上改正了地形坡度造成的误差,提高了森林冠层高反演精度,在坡度大的地区精度提升程度更为明显。     

激光对苦荞陈种子萌发和生长的影响

用不同剂量的He-Ne激光辐照处理贮存3年的苦荞种子,结果显示,适宜的激光可降低苦荞陈种子浸出液的电导率,有效地提高苦荞陈种子的发芽势、发芽率、芽长和芽鲜质量,显著提高苦荞幼苗的苗高和根长。激光辐照是提高苦荞陈种子萌发力和幼苗生长力的有效方法。