多种糖类添加物对秘鲁鱿鱼(Loliginidae)肌原纤维蛋白抗冻保水效果及构象变化影响研究   总被引：2，自引：0，他引：2  

丁晨  谢超  张宾  林琳  马路凯 《海洋与湖沼》2014,45(5):1044-1050

为探索海藻糖类对于冷冻水产品的抗冻保水效果,以秘鲁鱿鱼(Loliginidae)鱼糜为研究对象,以焦磷酸钠保水处理为对照,研究海藻糖、海藻胶寡糖及海藻胶对秘鲁鱿鱼鱼糜蛋白质抗冻保水的作用效果。结果表明,–18°C冻藏6周后,1.0%海藻糖和海藻胶寡糖(500—600Da)处理效果最好,可显著降低冷冻鱿鱼鱼糜解冻汁液流失(5.00%—5.54%),其与焦磷酸钠保水效果无显著性差异(5.02%—5.48%,P0.05)。整个冻藏期内,随着冻藏时间延长,不同处理鱿鱼鱼糜盐溶性蛋白、Ca2+-ATPase活性及总巯基均呈逐渐下降趋势,其中海藻糖、海藻胶寡糖对鱿鱼鱼糜蛋白质特性的保护效果,显著优于蒸馏水、焦磷酸钠处理(P0.05)。本研究可为开发一种安全、高效、节能、环保,适用于冷冻鱿鱼的海藻糖类抗冻保水剂提供参考。  相似文献   

设置问题情境 解决地理问题     

梁彦  姜晓敏 《地理教学》2014,(9):60-61

正这个教学设计的出现,源于一次示范课。既要让听课的老师和学生们感受到自然地理传承中有教师"手把手"的教,也要体现出"情境教学"在课堂中的魅力,这就要求创设的问题探究不能华而不实,要回归高考的本质。在进行"洋流对地理环境的影响"教学时,设置情境,提出问题,要求学生先独立完成四个情境问题,然后同小组交换意见,再派代表展示结果。题目:几位秘鲁青年人决定一起参加"从秘鲁经太平洋去冰岛,体验异域风情"的环球之旅活动,他们从秘鲁出发,乘船经太平洋至冰岛环球旅行。  相似文献   

The effects of the identity of shrub species on the distribution and diversity of ground arthropods in a sandy desert ecosystem of northwestern China     

JiLiang Liu  WenZhi Zhao  FengRui Li 《寒旱区科学》2014,6(6):0587-0596

Shrub is an important factor on structuring ground arthropod communities in desert ecosystems. In this study, in order to determine how shrubs and their species influence ground arthropod distribution patterns in a sandy desert scrubland dominated by two different shrub species, Calligonum mongolicum and Nitraria sphaerocarpa, the ground arthropods were sampled with pitfall traps during spring, summer and autumn. At the community level, total arthropod abundance was shown to be significantly higher under shrubs than in intershrub bare areas in spring; similar patterns occurred in terms of the richness of arthropod groups in the spring and over three seasons, suggesting season-specific shrub presence effects on arthropod activity. In addition, more arthropods were found under N. sphaerocarpa shrubs than under C. rnongolicum shrubs in autumn, suggesting season-specific effects of shrub species of arthropod activity, whereas more arthropods taxa were captured under C. mongoIicum than N. sphaerocarpa. At the trophic group level, the abundances of predator and herbivore arthropods were significantly greater under shrubs than in intershrub bare habitats, whereas herbivore arthropods were more abundant under N. sphaerocarpa than C. rnongolicum, and an opposite rule was detected for predator arthropods At the family level, the mean abundances of Carabidae, Curculionidae, Gnaphosidae and Lycosidae were significantly higher in the shrub microhabitats than in the intershrub bare habitat, there was no significant difference between habitats on the mean abundances of Formicidae and Tenebrionidae. The study results suggested that shrub presence and shrub species variation are important determinants of ground arthropod assemblages in this desert ecosystem, but the responses of ar- thropods differed among trophic and taxonomic groups.  相似文献   

赞美红水河     

马兴佳 《中国地名》2014,(1):56-57

因神奇的传说而得名 因水资源居珠江水系之首而出名 因发达的内河航行而闻名 红水河位于中国广西壮族自治区西北部,为西江上游的别称。其上游为南盘江,在贵州省望谟县与北盘江汇合后称为红水河,下游与柳江汇合后称黔江。  相似文献   

中卫摘得西北地区首个“迪拜奖”     

《中国勘察设计》2011,(3):90-90

近日,宁夏回族自治区中卫市黄河湿地资源开发保护项目以其高水平规划、高品位建设、高效益管理荣膺国际人居环境最高奖“迪拜国际改善居住环境最佳范例奖”。宁夏中卫市地处中国西北部、黄河上游,北靠腾格里沙漠,南连干旱贫瘠的黄土高原,属干旱半干旱地区,生态环境较为恶劣。全市总人口116万,其中回族人口占34．7％。为改善生存环境,保护“母亲河”,  相似文献   

南海西北部内陆架表层沉积物的重矿物分布及其控制因素     

初凤友  张富元  张欢  李正刚  陈灵 《海洋地质与第四纪地质》2011,(4):89-96

对2008年取自于南海西北部内陆架408个站位表层沉积物样品进行了重矿物研究.结果表明:本区重矿物可划分为3个重矿物组合区,各分区的优势重矿物组合分别为锆石-钛铁矿-赤铁矿,白钛矿-锐钛矿-绿帘石以及辉石-角闪石-绿帘石.3个区域在沉积环境、水动力状况、沉积物粒度、氧化还原条件方面都存着明显的差异,反映重矿物的分布受到...  相似文献   

Carbon and oxygen isotopes suggesting deep-water basin deposition associated with hydrothermal events （Shangsi Section,Northwest Sichuan Basin-South China）     

CHEN Hui  XIE Xi＇nong  MAO Kainan  HUANG Junhua 《中国地球化学学报》2014,33(1):77-85

Carbon and oxygen isotope records for Shangsi Section in Northwest Sichuan Basin, South China can help investigating depositional environments and processes, including the burial rate and possible contribution of hydrothermal events. Samples from the lower Chihsian Formation show δ13CPDB and δ18OPDB values close to those of typical marine limestone. However, the overlying Permian middle-upper Chihsian, Wujiaping, and Maokou Formation samples reveal negative δ18OSMOW values and strong positive δ13CPDB values. These indicate high biological productivity and rapid burial of organic carbon. Samples from the Dalong Formation present both negative δ13CPDB and negative δ18OPDB values, which are quite different from the underlying Permian strata. These abnormal carbon and oxygen isotope characteristics in the Dalong Formation may suggest that hydrothermal processes contributed to deposition.  相似文献   

塔里木西北部乌什—柯坪—巴楚地区古生代沉积—构造演化及成盆动力学背景沉积—构造演化及成盆动力学背景   总被引：1，自引：1，他引：0       下载免费PDF全文

吴根耀  李曰俊  刘亚雷  赵岩 《古地理学报》2013,15(2):203-218

把柯坪断隆“还原”为塔里木板块的一部分,重塑了它与北邻的乌什地区和南邻的巴楚地区古生代“分分”“合合”的演化史,得到以下重要认识。（1）奥陶纪在乌什、柯坪和巴楚一间房地区发育以东西向的古吐木休克断层为南界的台盆;该断层的西段后期被柯坪塔格断裂（东西走向段）迁就利用,中—东段后期因被肢解而“消失”。（2）柯坪地区最西部中泥盆世已有海相沉积,晚泥盆世—石炭纪海侵不断向东扩展;因南天山洋的消减在柯坪—阿克苏—库车一线形成横贯塔里木北缘的石炭纪隆起带,使得塔里木中—北部上泥盆统—石炭系的沉积相有清楚的空间展布规律。（3）据同位素年龄值将柯坪地区东段玄武岩的时代更正为早二叠世,强烈火成活动造成的热隆升使该地区早二叠世即出现陆相沉积;塔西北的其他地区石炭纪末—早二叠世普遍发生海侵。（4）从与南天山洋和西昆仑洋耦合演化的角度简要探讨了塔里木西北地区古生代的成盆动力学背景,认为古生代有东西向、北西向及北东向的控盆和控相断裂发育并总结了其后期演化的特点。  相似文献   

南海西北部莺琼陆坡36.6ka以来的浊流沉积     

许莎莎  冯秀丽  冯利  肖晓  刘爽 《海洋地质与第四纪地质》2020,40(5):15-24

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2001年典型震例及其启示   总被引：2，自引：0，他引：2  

梁凯利 《国际地震动态》2002,(6):21-24

2001年全世界共发生Ms≥7.0地震23次，其中7.0-7.9级地震21次，8级以上地震2次。文章介绍了一些典型震例和其特点，以及从中得到的启示。  相似文献