甲壳素及壳聚糖的制备与利用

本文综述了从水产加工废弃物虾、蟹壳中制取甲壳素和壳聚糖的方法。简要介绍了甲壳素和壳聚糖及其衍生物的开发应用现状,供有关方面充分利用甲壳素资源参考。     

废弃甲壳资源化利用制天然高分子甲壳素／壳聚糖研究

本文以四川地区市场上的废弃甲壳资源为原料，废物资源化利用制取甲壳素；又分别采用一步法和两步法制备多种不同质量的壳聚糖，测定其红外光谱和各种质量指标，并将其用于溶液中Ｐｂ＾２＋离子的吸附试验，效果良好。     

CMF微生物菌剂修复河流污水的动力学分析

本文利用甲壳素包裹的复合微生物菌剂CMF，对河流污水进行生物治理，CX3Dcr去除率达87．75％，BOD5去除率为86％以上。建立了河水中有机物降解的动力学模型，并通过工程实验数据，推算出了污水中有机物降解的动力学参数。     

壳聚糖及其应用

壳聚糖为甲壳素脱乙酰化的产物,其应用研究已取得较大进展,并且已有相当部分进入实用阶段或商品化阶段.壳聚糖的应用面广,它在生物学、医学领域以及食品、化妆品、环保、纺织、印染、造纸等工业上均有较大的应用价值.介绍了近几年壳聚糖在生物学、医学和环保等领域的应用前景,以推动对它的深入研究和利用,从而开辟出更新、更广阔的应用领域.     

秋雨绵绵走平遥

正豆叶黄,谷又熟。中秋节刚过,连绵的秋雨就至,被雨雾笼罩的乡野,无边无际地寂静,唯有雨脚在沙沙行走。戴着一顶斗笠,背着一个背篓,拿着一把银镰,从繁华的初秋走来,走过丰硕的中秋,向萧瑟的深秋走去,像一株老腰了的高粱。那秋雨的身影,伴随着我一路前行,直至消失在了那乡野的尽头。前方出现一座静穆的古城,雄浑壮阔的城垣,肃立挺拔的马面,绵延凸凹的女墙,昂扬高亢的城楼,一如既往的雄姿,哦,让我又见平遥。     

如果我是一只鸟

抬起头看灰蒙蒙的天空,浓厚的尘埃遮蔽了洁白的云彩。听说,在遥远的太古时代,天空也经常是灰蒙蒙的,可那是因为成群的飞鸟,阻挡了太阳的光线。而现在,寥寥无几的鸟儿,偶尔飞过天空,也是在急切的寻找巢穴。如果我是一只鸟,看到不再纯洁的天空,我会流下悲伤的眼泪。那曾经是我们天然的乐园,我和兄弟姐妹们在那里游荡嬉闹,有时会追着轻飘飘的云彩飞出好远,回来的     

携卷《诗经》走四方

在苇丛坐下,打开随身携带的《诗经》,翻到《秦风·蒹葭》。蒹葭丛中读《蒹葭》,真是亲切,就觉得是回到了诗的故乡,回到那个遥远而古老的年代。一有时候,就觉得,假日行走,若是随身携带一卷《诗经》,也许常常会在不经意间,就撞醒一个沉睡千年的美丽意象,闯进一片久蕴心头的奇妙意境,让你的旅行多一种诗意的愉悦和难以言表的快感。呱呱——唧啾,呱呱一一唧啾,……一串清脆的鸟呜,将您从酣睡中唤醒。睁开眼,窗前已是阳光灿烂。这是一个春天的假日,原计划要读读《诗经》的,何不到室外去读呢?于是操书出门,乘着和风,循着鸟声,不知不觉间,已来到一条河边。河心沙洲上,正有一对美丽的小鸟,相对而鸣。呱     

小溪

在我童年的时候,家乡有一条长长的小溪,向南不知从何处流来,向北不知流向何处。就这样日日夜夜的流着。春秋冬夏,日出日落,唱着那只永不疲倦的歌。小溪边,留下了我童年的足迹,小溪里,洒下了我们童年的歌声,洒下了我们无尽的欢乐,我们无尽的情趣,我们无限的向往……     

过去 现在 未来

地球,曾经是多么美丽的地方:群山环绕,无数棵苍翠挺拔的大树驻守在这片广阔的土地上,小鸟在歌唱,鱼儿在嬉戏,成双成对的蝴蝶翩翩起舞,蜜蜂也在争奇斗艳的花朵中辛勤劳动。一切都是那么美好,充满活力,充满生机。当然,这是过去的地球。现在的地球,因为科技越来越发达,万丈高楼随着棵棵大树的倾倒拔地而起,小鸟没有了家园;波光     

让美丽与我们同住

碧绿的草,巍峨的山,秀丽的河,五颜六色的花朵,洁白的云朵。与我们同行,与我们同住。怎么才能留住身边的美丽呢?首先,我们要植树造林。现在社会经济发展起来,就开始砍伐树木,盖高大的楼房。楼房虽然高大美丽,但还是不如树木重要,树为我们遮荫,为我们净化空气,为我们绿化世界。众所周知,以前翠绿的树林是鸟儿们安心的小窝,可这几年的树木越来越少,鸟儿也越来越少,新鲜的空气一去不复返了。     

浙江省生态环境现状及其保护对策

通过对浙江省生态环境建设现状及其存在问题的分析 ,提出了加强该省生态环境建设 ,改善生态环境状况的对策措施。     

醴陵市土地利用与生态环境建设问题研究

在阐述醴陵市土地利用和生态环境现状的基础上,分析了醴陵市土地利用中存在的主要问题,对生态环境现状进行了评价,并提出了醴陵市生态环境建设与保护的战略步骤和措施。     

利用HSRP技术实现核心数据设备的双机热备

秦皇岛渤海在线信息网络公司现行的网络中,4006负责到两个出口PIX的策略路由,到远端交换机的VLAN路由,还有不出外网的内网VLAN的交换。目前网络对4006的依赖性太强,增加一台性能更强的4506同4006做HSRP双机热备和部分业务的冷备。本文通过分析秦皇岛渤海在线网络公司网络现况,介绍利用HSRP技术实现核心数据设备的双机热备的实现原理和具体的实现方法。     

两型社会下人居环境的全过程优化研究与实践——以室内空气质量优化为例

结合中国住宅室内装修污染现状,在当前日益注重室内空气品质的趋势下,通过全过程控制室内空气污染,对现有的室内污染物控制方式进行优化,从而有效保证室内空气品质,打造安全、健康、环保的绿色人居环境。     

Ecological assessment of natural resources in agroecosystems of Dutch Lowland Peat area

In ecological assessment many abiotic and biotic indicators, reflecting the many facets of ecosystems, are used. Reporting on the state of the environment requires that information on separate indicators be integrated into comprehensive yardsticks or indices. In this paper we describe a method for assessing the quality of natural resources in agroecosystems and present a case study on the Dutch Lowland Peat area. Using a coherent set of physical, chemical, and biotic indicators, we compare the present situation with the long-term policy objective of strategic policy plans. Results are depicted in a radial plot. The present ecological quality of the Lowland Peat area has been found to deviate strongly from that of the desired state.     

提高环保投资水平的对策分析

通过对我国环境保护投资水平现状进行论述 ,就我国环保投资存在的问题 ,结合西方发达国家在这方面的经验及我国目前经济发展状况 ,对如何提高我国环保投资水平的途径及方向做了分析论述。     

“四荒”资源的开发利用途径：以铜梁县为例

开发利用荒山（坡）、荒草地和荒水资源是当前农业向深度开发的重要内容。本文分析了铜梁县“四荒”资源的现状、开发“四荒”资源的措施和经验，提出了开发利用“四荒”资源的主要途径。     

NATIONWIDE STUDY OF THE STREAMFLOW DATA PROGRAM

During 1970 the Geological Survey conducted a study to evaluate the surface-water data collection program. Objectives were formulated, specific goals were set, a massive analysis of available data was made to determine the extent to which the present system enables the goals to be met, alternatives were considered for meeting the remaining goals, and finally, specific elements were identified for inclusion in the future program. The results of the evaluation will be used in planning the future streamflow data program. Less productive elements in the present program can be weeded out, and the effort devoted to more critically needed water data. The study provides the groundwork for redirection of efforts towards a more efficient system for satisfying present and future needs.     

Comparison of heavy metals content in compost against vermicompost of organic solid waste: Past and present

Disposal of the municipal organic solid waste is a serious problem worldwide. Composting is one of the most preferred methods of solid waste management practice, principally due to the high percentage of organic material in the waste composition. Composting has advantages over land-filling and incineration in Mauritius because of lower operational costs, less environmental pollution, beneficial use of the end product, high humidity and organic content of household waste. Vermicomposting is a comparatively enhanced method in composting, and involves the stabilization of organic solid waste through earthworm consumption that converts the waste into earthworm castings. In both composting and vermicomposting processes, the presence of heavy metals and different toxics substances limits its land use without processing. The production and application of compost potentially contaminate the environment with heavy metals. There is a high-degree of consensus in the past and present literatures that composting increases metal concentrations but whether similar changes in metal concentration and availability occur during vermicomposting has not been fully resolved. This review deals with various total metal contents present in composting compared to that present in vermicomposting of organic solid wastes from past and present years.     

水电站工程项目区生态环境现状评价方法初探——以开都河柳树沟水电站工程为例

在野外实地调查和遥感影像解译的基础上,采用传统生态学样方调查法和景观生态学生态完整性评价法相结合的方法,对开都河柳树沟水电站工程项目区生态环境现状进行评价.评价结果显示,这种评价方法能更全面有效的对项目区的生态环境现状进行评价.