山东省海洋水产原、良种产业的发展和对策          下载免费PDF全文

田敬云  张守都  姜勇  赵喜喜  郑冰  刘学庆  胡建廷 《海洋开发与管理》2018,35(12):42-46

为进一步提高山东省海洋水产种业的发展水平，促进海水养殖业和渔业经济的可持续发展，文章总结山东省海洋水产原、良种产业的发展特点，分析存在的问题，并提出对策建议。研究结果表明：山东省海洋水产原、良种产业具有起步较晚但发展速度较快，品种多、覆盖面广，代际连续性较强以及原、良种场建设全国领先的特点；目前仍然存在海洋水产良种的市场化程度较低、水产企业良种研发能力较弱以及国家级原、良种场的作用未有效发挥的问题；今后应重点推动育种技术进步，推进育、繁、推一体化发展模式，树立品牌意识，建立良种独立技术体系，加大对水产企业的支持力度，加强种质资源保护以及建立市场准入制度。  相似文献   

威海南部近岸泥质区晚更新世以来的重矿物组合特征及对物源的指示     

刘金庆  宋红瑛  印萍  张勇  曹志敏 《海洋学报》2018,40(3):129-140

对威海南部近岸泥质区WHZK01孔（孔深25.1 m）岩心开展重矿物分析，结果表明，WHZK01孔主要以普通角闪石（22.1%）、磁铁矿（20.0%）和绿帘石（17.7%）为主，晚更新世以来自下而上可分为3个矿物组合带。氧同位素3期晚期河流相沉积（DU3）主要矿物组合为普通角闪石-绿帘石。末次冰后期河漫滩-河口湾相沉积（DU2）主要矿物组合为普通角闪石-绿帘石-钛铁矿-褐铁矿。全新世滨-浅海相沉积（DU1）主要矿物组合为磁铁矿-绿帘石-片状矿物-自生黄铁矿。重矿物物源判别表明，DU3和DU2层沉积物主要来自山东半岛南部沿岸河流输入。DU1层沉积物主要来自沿岸流输运的大量黄河细粒物质，沿岸河流物质和岛屿侵蚀物也有少量贡献。  相似文献   

Gravitational Waves and Gravitational-wave Sourcestwo     

Zhao Wen  Zhang Xing  Liu Xiao-jin  Zhang Yang  Wang Yun-yong  Zhang Fan  Zhao Yu-hang  Guo Yue-fan  Chen Yi-kang  Ai Shun-ke  Zhu Zong-hong  Wang Xiao-ge  Lebigot Eric  Du Zhi-hui  Cao Jun-wei  Qian Jin  Yin Cong  Wang Jian-bo  Wen Lin-qing 《Chinese Astronomy and Astrophysics》2018,42(4):487-526

The recent discovery of gravitational-wave burst GW150914 marks the coming of a new era of gravitational-wave astronomy, which provides a new window to study the physics of strong gravitational field, extremely massive stars, extremely high energy processes, and extremely early universe. In this article, we introduce the basic characters of gravitational waves in the Einstein's general relativity, their observational effects and main generation mechanisms, including the rotation of neutron stars, evolution of binary systems, and spontaneous generation in the inflation universe. Different sources produce the gravitational waves at quite different frequencies, which can be detected by different methods. In the lowest frequency range (f < 10^?15 Hz), the detection is mainly dependent of the observation of B-mode polarization of cosmic microwave background radiation. In the middle frequency range (10^?9 < f < 10^?6 Hz), the gravitational waves are detected by analyzing the timing residuals of millisecond pulsars. And in the high frequency range (10 ? 4 < f < 10⁴ Hz), they can be detected by the space-based and ground-based laser interferometers. In particular, we focus on the main features, detection methods, detection status, and the future prospects for several important sources, including the continuous sources (e.g., the spinning neutron stars, and stable binary systems), the burst sources (e.g., the supernovae, and the merge of binary system), and the stochastic backgrounds generated by the astrophysical and cosmological process. In addition, we forecast the potential breakthroughs in gravitational-wave astronomy in the near future, and the Chinese projects which might involve in these discoveries.  相似文献   

Changing Connectivities of Chinese Cities in the World City Network,2010–2016     

Ben Derudder  Zhan Cao  Xingjian Liu  Wei Shen  Liang Dai  Weiyang Zhang  Freke Caset  Frank Witlox  Peter J. Taylor 《中国地理科学(英文版)》2018,28(2):183-201

Against the backdrop of the sizable economic growth of China in recent years, this paper uses the most recent data gathering of the Globalization and World Cities(Ga WC) research network to update and supplement earlier research on the shifting global connectivity of Chinese cities. The update consists of an evaluation of the connectivity of Chinese cities in 2016, the supplement of an analysis of the changing position of Chinese cities in the world city network between 2010 and 2016. To this end, we build on a specification of the world city network as an ‘interlocking network' in which producer services firms play the crucial role in city network formation. Information about the presence of leading producer services firms in cities in 2010 and 2016 is used as the input to a bipartite network projection algorithm in order to measure cities' network connectivity. The first set of results discusses the geographies of urban connectivity in the world city network in 2016. The second set of results discusses standardized measures of change to reveal the major dimensions of the transformations between 2010 and 2016. We find that, with the exception of Hong Kong, Macau and Kaohsiung of Taiwan, all Chinese cities record connectivity gains. This wholesale rise in connectivity is nonetheless geographically uneven, with above all Beijing, Chengdu/Chongqing and Changsha/Wuhan becoming more connected. We conclude that the wholesale rise of Chinese cities in the world city network and their changing trajectories in the post-crisis era are embedded in shifting external and internal political economies.  相似文献   

饥饿胁迫对大黄鱼激素敏感性脂肪酶和乙酰辅酶A羧化酶mRNA表达及酶活性的影响     

钱宝英  黄红丽  李娟  曹明月  张玉  赵亚运  薛良义 《海洋学报》2018,40(12):31-39

激素敏感性脂肪酶（hormone sensitive lipase，HSL）和乙酰辅酶A羧化酶（acetyl-CoA carboxylase，ACC）是脂代谢的关键酶，肌肉和肝脏是鱼类脂代谢的主要场所。为研究饥饿过程中这两种酶的作用，本实验采用实时荧光定量PCR技术以及ELISA技术检测了在35 d饥饿过程中这两种酶在大黄鱼肌肉和肝组织中mRNA表达水平和酶活性的变化。结果显示，饥饿胁迫显著降低大黄鱼肌肉和肝组织中脂肪含量，以及脂肪合成关键酶ACC mRNA表达水平（P<0.05）；显著提高脂肪分解关键酶HSL mRNA表达水平（P<0.05）。饥饿胁迫对肌肉和肝组织中HSL和ACC酶活性均有显著影响（P<0.05），肌肉和肝组织HSL （相关系数r分别为0.598 2和0.539 6）以及肌肉组织ACC酶活性（r=0.677 7）与对应mRNA表达水平呈中度正相关（0.5 < r < 0.8），但ACC酶活性在肝组织与其对应的mRNA表达量呈负相关（r=-0.374 0），提示饥饿胁迫对大黄鱼HSL和ACC的表达存在翻译前和翻译后两种水平的调控。本研究结果可为研究饥饿胁迫对大黄鱼脂类代谢分子层面的影响机制提供依据。  相似文献   

What do parameterized Om(z) diagnostics tell us in light of recent observations?     

Jing-Zhao Qi  Shuo Cao  Marek Biesiada  Teng-Peng Xu  Yan Wu  Si-Xuan Zhang  Zong-Hong Zhu 《天文和天体物理学研究(英文版)》2018,(6)

In this paper, we propose a new parametrization for Om(z) diagnostics and show how the most recent and significantly improved observations concerning the H(z) and SN Ia measurements can be used to probe the consistency or tension between the ΛCDM model and observations. Our results demonstrate that H0 plays a very important role in the consistency test of ΛCDM with H(z)data. Adopting the Hubble constant priors from Planck 2013 and Riess, one finds considerable tension between the current H(z) data and ΛCDM model and confirms the conclusions obtained previously by others. However, with the Hubble constant prior taken from WMAP9, the discrepancy between H(z) data and ΛCDM disappears, i.e., the current H(z) observations still support the cosmological constant scenario. This conclusion is also supported by the results derived from the Joint Lightcurve Analysis(JLA) SN Ia sample. The best-fit Hubble constant from the combination of H(z)+JLA(H00 = 68.81+1.5-1.49 km s-1 Mpc-1) is very consistent with results derived both by Planck 2013 and WMAP9, but is significantly different from the recent local measurement by Riess.  相似文献   

Comparison of otolith shape descriptors and morphometrics for stock discrimination of yellow croaker along the Chinese coast     

宋骏杰  赵博  刘金虎  曹亮  窦硕增 《中国海洋湖沼学报》2018,36(5):1870-1879

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丹荔输通汤治疗输卵管阻塞29例临床观察     

乔江  胡雪晴  陈怀敏 《应用海洋学学报》2018,34(12):6-9

目的：观察丹荔输通汤治疗输卵管阻塞（气滞血瘀型）患者的临床疗效及对血清细胞间黏附分子-1（ICAM-1）、血管内皮生长因子（VEGF）水平的影响。方法：将60例输卵管阻塞（气滞血瘀型）患者随机分为治疗组与对照组，每组各30例。对照组采用宫腔注药治疗，治疗组在宫腔注药基础上加丹荔输通汤口服液治疗。结果：总有效率治疗组为89.66%，对照组为46.43%，2组比较，差异有统计学意义（P<0.01）；2组中医证候积分治疗前后组内比较及治疗后组间比较，差异均有统计学意义（P<0.01）；输卵管通畅率治疗组为77.59%，对照组为53.57%，组间比较，差异有统计学意义（P<0.01）；2组血清ICAM-1水平、VEGF水平治疗前后组内比较及治疗后组间比较，差异均有统计学意义（P<0.01）。结论：丹荔输通汤能明显提高输卵管阻塞（气滞血瘀型）患者的临床疗效及输卵管通畅率，可能与ICAM-1、VEGF水平变化有关，提示ICAM-1水平升高、VEGF水平降低可能是输卵管阻塞的病理机制之一。  相似文献   

Effects of climatic events on the Chinese stock market: applying event analysis     

Guangxi Cao  Wei Xu  Yu Guo 《Natural Hazards》2015,77(3):1979-1992

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The improvement of a regional climate model by coupling a land surface model with eco-physiological processes: A case study in 1998     

Li Dan  Fuqiang Cao  Rong Gao 《Climatic change》2015,129(3-4):457-470

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