钙离子浓度对三种贵州喀斯特地区苔藓植物孢子萌发及？…

为了探讨斯特环境中钙离子对苔藓孢子的影响，本文设计了液体培养基实验。研究结果表明，紫背苔孢子萌发范围为０－０．１％，而反纽藓和直叶珠藓孢子萌发范围为０－０．５％，三种苔藓孢子萌发率在钙离子浓度为０．０２％时最高；在钙离子浓度为０．０２％时，三种苔藓原丝体生长状况最好。     

外阴硬化苔藓基底细胞核DNA含量分析

运用图像分析技术，通过Feulgen染色检测外阴硬化性苔藓组织及正常外阴皮肤组织角朊细胞基底细胞核积分光密度、DNA含量。结果显示，与外阴正常皮肤组织比较，硬化性苔藓组织的角朊细胞基底细胞核和分光密度、DNA含量明显降低，差异有显著性（P＜0．05），硬化性苔藓组织的角朊细胞基底细胞核增生能力较正常皮肤低下。     

河南发现淡水苔虫

苔藓动物是无脊椎动物中一个小类群，为典型的固着型动物，目前已报道约４０００种，我国有１９９种．苔藓动物绝大多数种类生活在海洋中，是海洋污损生物的主要组成，我国渤海海域分布有１５种．淡水苔虫的种类很少，只有几十种，我国已记录１１种，分布在北京、杭州、沈...     

钙离子浓度对三种贵州喀斯特地区苔藓植物孢子萌发及原丝体生长的影响

为了探讨喀斯特环境中钙离子对苔藓孢子的影响，本文设计了液体培养基实验。研究结果表明，紫背苔孢子萌发范围为０％～０．１％，而反纽藓和直叶珠藓孢子萌发范围为０％～０．５％。三种苦藓孢子萌发率在钙离子浓度为０．０２％时最高；在钙离子浓度为０．０２％时，三种苔藓原丝体生长状况最好。     

江西云居山苔藓植物生态群落的初步研究

在对云居山苔藓植物种类、生态环境全面调查的基础上，提出云居山苔藓群落类型的划分，即：水生苔藓群落、土生苔藓群落、石生苔藓群落、木生苔藓群落，并对常见种类及群落进行了叙述。     

培养条件对坛紫菜(Porphyra haitanensis)(Rhodophyta)自由丝状体超低温保存的影响

通过培养条件对坛紫菜(Porphyra haitanensis T．J．Chang et B．F．Zheng)自由丝状俸超低温保存的影响的研究，结果表明：不同培养条件，存活率不同；生长旺盛的丝状体存活率较低；经抗寒锻炼的丝状体有一定的存活率；在适于形成膨大藻丝的条件下，丝状体存活率最高，可达60％以上．     

苔藓与种子植物对不同化学元素富集能力的比较

采用电感耦合等离子体发射光谱（ICP—ES）对采自浙江省天目山国家自然保护区的18种苔藓和4种种子植物体内的As，Cd，Cr，Cu，Mn，Ni，Pb，V，Zn，A1，Fe，K，Ca，Na，Mg，P16种元素含量进行测定和比较．结果表明：不同苔藓植物对同种元素的富集能力不同，同种苔藓对不同元素的富集能力也不同；部分土生苔藓植物体内及其着生的土壤中的元素含量比较说明：苔藓植物体内重金属含量与其生长基质无显著相关性．同时证明苔藓植物在监测重金属污染方面要优于种子植物，是一种良好的大气质量指示植物．     

河北省药用苔藓资源的初步研究

对河北省药用苔藓资源进行了野外调查与研究，首次报道了药用苔藓植物28种。隶属于15科21属，占河北苔藓植物总种数的11．48％．列出28种药用苔藓植物的分布及其药用功效，为进一步开发河北省苔藓植物资源和中草药资源提供新的资料．     

云南中甸长苞冷杉群落的生物量和净生产量研究

本文研究了云南中甸县吉迪村长苞冷杉群落的生物量和净生产量。结果为：长苞冷杉群落的生物量为３５１．６２３ｔ／ｈｍ￣２，其中乔木层占９７．８７％，灌木层占０．１４％，草本层占０．１７％，苔藓层占０．６７％，凋落物占１．１５％。群落的净生产量为１２３０．６ｇ／ｍ￣２·ａ，其中乔木层占９４．６２％，灌木层占０．７０％，草本层占１．６３％，苔藓层占３．０５％，优势种长苞冷杉的生物量和净生产量分别为３３４．７７７ｔ／ｈｍ￣２和１０９７．８ｇ／ｍ￣２·ａ，分别占群落总量的９５．２１％和８９．２１％。其它乔木材种的生物量和净生产量分别为９．３６４ｔ／ｈｍ￣２和６６．６ｇ／ｍ￣２·ａ，分别占群落总量的２．６６％和５．４１％。     

探究不同条件对苔藓分泌物酸性的影响

我在老家的房子里发现墙上长了一些绿绿的苔藓，周围的水泥都脱落了。这些苔藓怎么能把墙“咬坏”呢？苔藓是怎样的一种植物？我去请教爸爸。爸爸告诉我：苔藓虽然植株矮小、结构简单，却是一种古老的植物；至于为什么能把墙“咬坏”，可能是其分泌的酸性物质腐蚀了墙体。     

Study of moss as air pollution monitor by SRXRF technique

In order to explore the mechanism of moss as air pollution biomonitor, the moss samples were exposed in a pollution site of Shanghai Institute of Steel Research （SISR） and a control site of Shanghai Institute of Applied Physics （SIAP） simultaneously for one month. The concentrations of trace elements in the micro areas of leaf and stem, as well as in the whole moss tissue, were determined using synchrotron radiation X-ray fluorescence （SRXRF） method. The distributions of some metal elements such as Pb, Cu, Fe, Ni, Mn, Zn, Ca and K in the leaf surface and the stem slice were obtained. The results showed that the metallic ions were not evenly distributed after adsorption. In particular, some elements of K, Ni, Fe, Pb, etc., were concentrated in the leaf apex and the intermediate rib. Under pollution condition, the excessive Pb was adsorbed and deposited in the leaf. It caused serious damage to plant growth and ultrastructure, also suppressed moss’ normal absorption to the nutritive elements of K, Ca, etc.     

Static analysis of Java bytecode

Understanding control flows in a computer program is essential for many software engineering tasks such as testing, debugging, reverse engineering, and maintenance. In this paper, we present a control flow analysis technique to analyze the control flow in Java bytecode. To perform the analysis, we construct a control flow graph (CFG) for Java bytecode not only at the intraprocedural level but also at the interprocedural level. We also discuss some applications of a CFG in a maintenance environment for Java bytecode.     

基于改进军用安全模型的sJava语言

为了发现、控制软件中的非法信息流,利用改进后的军用安全模型对Java语言的安全性进行扩展,提出了一种基于类型的信息流控制方法.将安全级别编码为程序中的类型,并利用定型规则发现非法的信息流,扩展后的语言称为sJava.给出了sJava类型安全性的证明,实现了对开源的Java编译器Jikes的安全性改造.结果表明,sJava语言源程序能直接编译成字节码,不增加系统的运行负载.     

Java语言在通信程序中的应用

介绍了Ｊａｖａ网络通信方面的内容。在基于ＴＣＰ（传输控制协议）及ＵＤＰ（用户数据报协议）协议的前题下,运用Ｊａｖａ丰富的类库,完成了双机通信及多机通信等功能。给出了创建多线程的一些关键技术,为利用Ｊａｖａ语言开发通信程序的软件设计者提供了一些方法和经验。     

一种并发Java程序控制流模型

研究了并发Java程序控制流模型的建模问题.通过深入分析并发Java程序设计语言的语义以及带抑止弧Petri网的建模能力,提出了一种并发Java程序控制流模型--CJCFM,并给出了从并发Java程序构造该模型的方法.CJCFM以带抑止弧Petri网为基础,简单直观,可模拟程序实际运行过程,对并发程序的理解、分析和测试有很大帮助.通过对现有开源Petri网实验平台PIPE的功能进行扩展,可在该平台中直接构造并执行CJCFM.借助成熟的Petri网理论与算法,可验证CJCFM的各种性质,从而达到对源程序进行分析的目的.实验表明:CJCFM能有效协助理解、分析和测试并发Java程序.     

基于Java RMI的网络信息监控系统设计

在分析JavaRMI技术的基础上 ,论述了JavaRMI实现Java同构环境下的分布式对象计算的关键技术 ,同时探讨了JavaRMI体系结构 .结合网络协议分析的应用技术 ,提出一个基于JavaRMI的分布式网络信息监控系统模型 ,通过系统各分监控点对公共上网场所的上网络信息进行监控     

Java中Excel操作类的设计与实现

为解决Java应用程序中复杂报表的打印问题,提出了一种采用JNI和COM技术、在Java中操纵Excel实现强有力报表工具的方法.在Java中利用JNI与COM的通信方式,通过对Excel各COM对象的调用,完成在Java中对Excel的操作;同时将Excel的各COM对象映射为Java对象,调用自行设计开发的一组纯Java API,实现在Java中的复杂报表功能.首先描述了该方案提出的方法和功能,然后给出了系统构架,最后讨论了Java和VC 的实现代码.     

Java Servlet的授权与访问控制机制研究

Ｊａｖａ Ｓｅｒｖｌｅｔ是一种新型的ＷＷＷ服务器编程方法,广泛应用于电子商务等网络计算模式中。通过网络共享Ｓｅｒｖｌｅｔ对象是Ｊａｖａ Ｓｅｒｖｌｅｔ的显著特性,但也蕴藏着授权与访问控制管理上的不足。本文提出了一种基于数字签名算法的授权与访问控制方案,安全、有效地解决了这种新兴共享资源的授权与访问控制问题。     

Factors influencing the natural regeneration of arrow bamboo in giant panda habitat of the north Minshan Mountains, southwestern China

To determine the effects of eco-factors on the regeneration of arrow bamboo in giant panda habitat,a field study was conducted in the Baozuo and Gonggangling Nature Reserves,Sichuan Province,China.A total of 183 quadrats(10 m×10 m) and 717 small quadrats(1 m×1 m) were investigated within the study site.Bamboo seedling density was used as an indicator of natural regeneration.Twelve factors were measured,which included topography and forest factors(elevation,slope aspect,slope degree,slope position,canopy cover,and shrub cover) and microhabitat factors(upper vegetation cover,herb cover,litter layer cover,moss cover,moss thickness,and dead bamboo density).A One-Way ANOVA was used to analyze the effects of topography and forest factors on seedling density,and a GLM(Generalized Linear Model) procedure was performed to examine the relationship between seedling density and microhabitat factors.The results indicated that elevation and canopy cover had highly significant effects on seedling density:bamboo seedling density was highest and showed the best regeneration at middle elevations(2800-3000 m) and under medium to medium-high canopy cover.Moss thickness,moss cover,and dead bamboo density were the most important microhabitat factors influencing the natural regeneration of bamboo:seedling density increased with increasing moss cover and moss thickness and decreased with increasing dead bamboo density.We propose that removal of dead bamboo and controlling grazing activities may accelerate the process of bamboo regeneration.     

Determination of dioxin-like polychlorinated biphenyls in soil and moss from Fildes Peninsula,Antarctica

Dioxin-like polychlorinated biphenyls(PCBs) are a class of toxic and persistent chemicals that are often found in the environment.The determination of dioxin-like PCBs in Fildes Peninsula,Antarctica,is reported in this paper.Dioxin-like PCBs were widely distributed in Antarctic soil and moss with concentration of 2.23-27.2 pg/g in soil and 10.4-812 pg/g in moss.The highest concentrations were found in the Ardley Island area and the lowest concentrations on the west coast.The contribution of PCB-118 to the ∑12PCBs ranged from 36.0% to 69.6% in soil,and 17.2% to 43.4% in moss.The congener specific patterns in soil and moss were similar.Long-range atmospheric transport is thought to be the main source of PCBs detected on King George Island.The ∑12PCBs toxic equivalent(TEQ) in soil was 0.400×10?3 to 516×10?3 pg(TEQ)/g with a mean value of 147×10?3 pg(TEQ)/g.PCB-126 had the largest contribution(81.1%) to the ∑12PCBs TEQ in soil.The ∑12PCBs TEQ in moss ranged from 2.90×10?3 to 1.19 pg/g with a mean value of 0.482 pg/g.PCB-126 was also the largest contributor(91.4%) to the ∑12PCBs TEQ in moss.The mean TEQ in moss was about 40 times that in soil.