Embryonic and larval development of Babylonia formosae habei(Altena and Gittenberger, 1981)(Gastropoda: Buccinidae) on China''s coast     

CHEN Yan  KE Caihuan  ZHOU Shiqiang  LI Fuxue 《海洋学报(英文版)》2004,23(3):521-531

The development of embryos and larvae of Babyloniaformosae habei living along the southeast coast of China is observed under laboratory conditions. The egg masses are laid by females on hard substrate at night and each capsule contains 100-500 eggs. Each egg is 250-280 mm in diameter. The fast two cleavages of the embryo are meridional and equal, and a polar lobe is produced. Larval kidney, which only consists of a single cell, appears during the gastrula stage on each side of the embryo. The right tentacle develops prior to the left one. At 25-27 ℃, an intracapsulate veliger stage is reached about 4.5 d after deposition. The larvae hatch on the fifth day as swimming veligers with a shell length of 360 -500 mm. The newly hatched larva can ingest suspended algal cells from the water column and remains in the pelagic stage for 8-10 d. The newly settled juveniles are 900-1 200 mm in shell length.  相似文献   

北太平洋宽吻海豚正常生理指标数值的算法     

陈艳  王文琪  徐申波  李建 《海洋科学》2003,27(12):7-9

连续5年对青岛海豚表演馆中北太平洋宽吻海豚(Tursiops gille Dall)进行现场实验和行为学研究，获取了大量的生理指标数据，运用不同的分析和计算方法对所得数据进行了筛选、剔除及处理，确立了海豚各生理指标的正常闽值和范围确定的方法，从而为准确了解海豚机体的生理状况、疾病诊断及治疗奠定了基础。  相似文献   

白天工作条件下大气激光雷达探测的实验研究     

宋小全  刘智深  贺岩  刘金涛 《中国海洋大学学报(自然科学版)》2001,31(4):593-598

作者在已完成大气激光雷达系统夜间工作的基础上 ,对白天工作条件下的各种环境背景光的干扰进行了理论与实验分析 ,得出太阳直射光和天空光为白天工作的主要背景干扰。实验结果表明 ,经过激光发射与接收视场角严格匹配及使用干涉滤光器 (2 .6 nm和 0 .15nm)进行窄带滤波 ,背景干扰被明显地剔除 ,可进一步压低背景干扰约 2 0倍。证明采取视场匹配及干涉滤光器的措施可基本保证激光雷达系统在白天条件下工作。  相似文献   

Shipborne GPS attitude determination during MMST-93   总被引：1，自引：0，他引：1  

Lachapelle  G. Cannon  M.E. Lu  G. Loncarevic  B. 《Oceanic Engineering, IEEE Journal of》1996,21(1):100-104

The attitude parameters of a ship underway were measured using a configuration of four 10-channel NovAtel Model 951 narrow-correlator-spacing receivers. These C/A code receivers have output rates of up to 10 Hz and maintain effective carrier phase lock under relatively harsh ship dynamics. The attitude parameters are calculated independently at each epoch using differential carrier phase measurements, carrier phase ambiguities are resolved on-the-fly by constraining the approximately known distances between the antennas that are rigidly mounted on the ship. Carrier phase thermal noise and multipath are minimized by mounting the antennas as far apart as possible. The four-antenna configuration provides redundancy and further improves accuracy. During the Matthew Motion Sensor Trials (MMST-93) conducted off the coast of Halifax, Nova Scotia, in June-July 1993, the GPS-derived attitude parameters were compared with those obtained with a Honeywell HG1050 ring laser gyro inertial navigation system (INS) which provides roll and pitch with an accuracy of 15 arcsecs and heading with an accuracy of 2 arcmins. To simulate rough weather conditions, sharp maneuvers were performed to induce roll angles in excess of 10°. No accuracy degradation nor any loss of GPS measurements occurred. The RMS agreement between GPS and INS derived attitude parameters is better than 2 arcmins in heading, 1 arcmin in pitch and 3 arcmins in roll. This level of accuracy demonstrates the capability of GPS for cost-effective shipborne attitude determination at an accuracy level of 0.05  相似文献   

藻类分子生物技术两年评─—与藻类活性物质研究有关的生物技术   总被引：4，自引：2，他引：4  

严小军  秦松  曾呈奎 《海洋与湖沼》1997,28(4):440-446

根据１９９２年６月－１９９４年６月国内外发表资料，评述海洋藻类活性物质研究的生物技术及最新成果。认为，海洋生物活性物质研究的重心正转向与海洋生物技术有关的研究。运用生物技术筛选、提取并生产藻类活性物质已经成为这一领域的主流。综合文献表明，藻类活性物质的生物技术正走向成熟，大量的活性物质被发现，光生物反应器将成为主要的下游生产技术，通过藻类基因工程生产药物已初现端倪。  相似文献   

A Preliminary Study of Shear Wave in Seafloor Surface Sediments   总被引：1，自引：0，他引：1  

Bo Lu  Ganxian Li  Shaojian Huang 《Marine Georesources & Geotechnology》2006,24(1):17-28

This article preliminarily reports and analyses the transmission characteristics and behaviors of shear wave in the offshore seafloor surface sediments in China, discusses the relationships between the physical and mechanical features of the shear wave and the compression wave, and compares the testing results with that of Hamilton and Chen et al. The result shows that the shear wave can be tested if the seafloor surface sediment has tangent modulus. The shear wave velocity ranges from 50-600 m/s and the measuring frequency from 50-200 kHz. The sound velocity rate of shear wave and compression wave can be used to appraise the stress-strain feature of seafloor surface sediments. This study provides a basis for further describing and appraising the seafloor sedimentary acoustic-mechanical feature and building a geological-acoustic model on China's offshore sea area.  相似文献   

白洋淀重新蓄水后的轮虫     

阎书民  张军 《海洋湖沼通报》1991,(1):46-53

1989年对白洋淀重新蓄水后的轮虫作了采样调查,共采到轮虫123种,隶属于46属12科,并对鉴定到种的轮虫作了初步分析。  相似文献   

Characterization of zebrafish metallothionein gene promoter in a zebrafish caudal fin cell-line,SJD. 1     

Yan CH  Chan KM 《Marine environmental research》2002,54(3-5):335-339

  相似文献   

用16S rRNA基因的内切酶图谱快速鉴别几种对虾病原菌   总被引：4，自引：0，他引：4  

孔杰  刘萍  张岩  杨丛海  叶军  徐怀恕  郭华荣 《海洋与湖沼》1997,28(5):449-452

坎普氏弧菌是青岛海洋大学生物系微生物实验室于１９８９－１９９０年自对虾养殖场中国对虾红腿病心脏及血淋巴中分离并鉴定的菌株，副溶血菌和溶藻胶弧菌两菌株于１９９４年９月得自中国科学院微生物研究所，为建立快速、准确的中国对虾病原菌的诊断技术，根据几种细菌的１６ＳｒＲＮＡ基因的序列，设计并合成该基因的多聚酶反应的引物ＰＬ１和ＰＬ２。并用该对引物分别从坎普氏弧菌、副溶血弧菌和溶藻胶弧菌的ＤＮＡ要品中扩增出分  相似文献   

中国近海海区污损生物研究现状及展望     

严涛  严文侠 《海洋科学集刊》2002,(44):89-94

近海海区通常是指离岸3n mile以上或水深超过25m的水域(Relini et al.，1994)；海洋污损生物是海洋环境中栖息或附着在船舶和各种水下人工设施上，对人类经济活动产生不利影响的动物、植物和微生物的总称，它不仅是影响海洋设施安全与使用寿命的重要因素，也是人类开始接触海洋时所关注的问题。本文就污损生物对海洋结构物的影响和我国近海污损生物研究的进展状况、存在问题等方面进行了综合论述，并对未来几年内为研究方向和重点进行了探讨，以期为下一阶段研究工作提供一些具有参考价值的依据和建议。  相似文献