香蕉叶片组织细胞结构特性与耐寒性的关系     

吕庆芳  丰锋  张秀枝 《广东海洋大学学报》2000,20(2):48-51

对广东目前推广的 4个香蕉良种以及粉蕉和大蕉进行切片显微观察 ,并结合低温处理的电导率测定 ,结果表明 ,香蕉叶片组织细胞结构紧密度 (CTR值 )与品种的耐寒性密切相关 ,且具有相对的稳定性 ,可作为香蕉耐寒性的鉴定指标。供试品种耐寒力强弱依次为粉蕉、大蕉、威廉斯 (8818)、“巴西”、“93- 1”、广东二号 (6 3- 1)。  相似文献   

Tolerance,oxygen consumption and ammonia excretion of Ophiopholis sarsii vadicola in different temperatures and salinities     

Fang  Jinghui  Zhang  Jihong  Jiang  Zengjie  Zhao  Xuewei  Jiang  Xu  Du  Meirong  Gao  Yaping  Fang  Jianguang 《中国海洋大学学报(英文版)》2015,14(3):549-556

There are more than 2000 species of brittle stars in the world. For most of them, many scientific questions including basic characteristics of eco-physiology are still unknown. In the present study, Ophiopholis sarsii vadicola acclimated at 15℃, salinity 31, were assessed for temperature and salinity tolerance. Its oxygen consumption and ammonia excretion were studied at different temperatures(5, 10, 15, 20, 25℃) and salinities(25, 30, 35). O. sarsii vadicola could tolerate 0–24℃ and no brittle star was dead in the salinity range of 19–48 in the experimental situation. Two-way ANOVA showed that the oxygen consumption and ammonia excretion normalized with both dry mass and wet mass, Q10, which is used to describe the temperature sensitivity of respiration, and moisture content were significantly affected by temperature and salinity, and the combined effects of the two factors were significant. Stepwise multiple regression analysis revealed that logarithmic oxygen consumption and ammonia excretion showed a significant positive relationship with logarithmic temperature and salinity. The logarithmic moisture content of the brittle stars showed an inverse relationship with logarithmic salinity, but a positive relationship with logarithmic temperature. This suggests that the tolerance of temperature and salinity of brittle stars is closely related to their living environment, and that the effects of temperature on oxygen consumption are more significant at higher salinity, and that the ammonia excretion is less affected by salinity at lower temperatures.  相似文献   

公共点坐标粗差检验方法及其限差的研究     

郭英起  曹先革  刘江 《全球定位系统》2012,37(4):30-32

GPS控制网在进行坐标系统转换或平差计算之前,大多都需要首先对已知公共点坐标的粗差进行检验。针对有关检验方法进行研讨,提出了检验限差标准。并结合实例进行计算和分析,成功剔除了坐标中含有粗差的已知公共点。  相似文献   

鹿道口高盐环境中一株溶血性葡萄球菌分离、鉴定与生理特征     

黄增金  汪城墙  尹腾飞  张小葵  刘爱秋 《海洋湖沼通报》2009,(4)

试验从威海市羊亭镇鹿道口盐场筛选、纯化了1种性状优良的菌株Staphylococcus haemolyticus wh-2,该菌株具有较强的生长代谢的能力,在多方面都表现优良,具有抗裂解,抗低温等性质,在不同逆境环境下培养与观察,认识到微生物在不同逆境环境下的生理多样性,是1株有优良特征的资源菌株.经16SrDNA鉴定分析,鉴定为溶血性葡萄球菌(Staphylococcus haemolyticus wh-2).  相似文献   

Drying of Micro-Encapsulated Lactic Acid Bacteria- Effects of Trehalose and Immobilization on Cell Survival and Release Properties     

LI Xiaoyan  CHEN Xiguang 《青岛海洋大学学报(英文版)》2009,(1):39-44

Lactic acid bacteria （LAB） were encapsulated with alginate, gelatin and trehalose additives by the extrusion method and dried at 4 ℃. The microcapsules were generally spherical and had a wrinkled surface with a size of 1.7mm± 0.2mm Trehalose as a carbohydrate source in the culture medium could reduce acid production and performed no function in the positive proliferation of LAB. Using trehalose as a carbohydrate source and protective medittm simultaneously had a benefit in the protection of LAB cells during the storage at 4 ℃. The density of live LAB cells could be 10^7 CFU g^-1 after 8weeks of storage. Cells of LAB could be continuously released from the capsules from the acidic （pH 1.2） to neutral conditions （pH 6.8）. The release amounts and proliferation speeds of LAB cells in neutral medium were much larger and faster than those in acidic conditions. Additionally, nxtmobilization of LAB could improve the survival of cells when they were exposed to acidic medium （pH 1.2） with a survival rate of 76%.  相似文献   

应用多种测量软件对地图后期处理     

项伟  窦炜  许斌 《四川测绘》2004,27(3):126-128

随着电子地图的出现和各种测量软件的开发，地形图实现了美观化和统一化。而各种测绘软件提供的开放性，也使我们可以在不同的测绘软件中对地形图加以编辑和修改，充分利用各个测绘软件的优势。本文结合实际工作经验，针对具体工作中遇到的一些问题，利用各种测绘软件的结合，使一些问题得到解决，并使图形更趋于美观化。  相似文献   

Stream invertebrate community functional responses to deposited sediment   总被引：3，自引：0，他引：3  

Charles F. Rabení  Kathy E. Doisy  Leanna D. Zweig 《Aquatic Sciences - Research Across Boundaries》2005,67(4):395-402

  相似文献   

EFFECT OF SALINITY ON EMBRYO AND LARVAL DEVELOPMENT OF THE SOUTHERN BAY SCALLOP ARGOPECTEN IRRADIANS CONCENTRICUS SAY     

何义朝  张福绥 《中国海洋湖沼学报》1998,(1)

INTRODUCTIONThes0uthembayscallop,AmpeandiansconamtaSay,isanAmpenirradiansInrnaforsouthamsubepedesdistributingalongthecoastSfromNorthCarolinat0Florida,andisanirnPohantshellfishforfisherieSinthesouthrmU.S.A.,butthere-sonisdmingduetoexanivecapture.ThesouthemsubspedeswasfuStintIDdutalinl99lintoChinabytheInstituteofdrinology,ChineSeAcadeInyofSdenas,andshowedwonderfulprospan,althoughthedeveopmentalbiol0gy,espedllytheeffedofboortantenvirDnmentalfactors(forexamPlesandtyorternPeratwonthis…  相似文献   

GPS网中已知点粗差探测时限差的研究     

伊晓东杨耀宇  郭英起 《东北测绘》2008,31(1):4-5,16

在利用附合导线法对GPS网中已知点的可靠性进行检核时,本文对如何合理地、客观地确定限差,以达到有效检核的目的进行了探讨,提出了检核限差标准。并结合实例进行计算和分析,成功地剔除了含有粗差的已知点。  相似文献   

风蚀容忍量研究进展及其若干问题的探讨   总被引：3，自引：3，他引：0  

孟祥亮  严平  宋阳  杨秀春  吴晓 《中国沙漠》2005,25(3):315-319

土壤风蚀是造成沙漠化的首要环节。长期以来,由于没有制定一个合理的风蚀控制临界值,土地利用和土壤风蚀防治之间的矛盾非常突出,风蚀控制措施收效不大。风蚀容忍量(T值)的研究,为风蚀控制提供了一个标准。在确定T值时,应该首先对风蚀地区进行分区,根据不同地区的情况和要求制定相应的T值标准,同时进行投入与产出的对比,制定T值的一个合理的阈值,使其随着我国经济的发展而逐步降低,从而使T值标准具有更强的实用性与适应性;在基于T值标准的风蚀防治措施的实施保障方面,除了要把它纳入法律轨道外,还需要制定相应的政策引导当地居民将之转化为脱贫致富的自觉行为,并建立生态资产补偿制度。  相似文献