Aragusterol C: A novel halogenated marine steroid from an Okinawan sponge,Xestospongia sp., possessing potent antitumor activity

A novel chlorinated steroid, aragusterol C, was isolated from an Okinawan marine sponge of the genusXestospongia. The compound strongly inhibited the proliferation of KB cells in vitro, and also showed potent in vivo antitumor activity against L1210 cells in mice. The complete structure of aragusterol C was determined by spectroscopic analysis and X-ray crystallographic analysis.     

河口悬浮物与海洋近岸表层沉积物中磷的海洋浮游藻类生物测定

利用九龙江口、黄河口悬浮物和厦门湾、泉州湾近岸表层沉积物作为磷源，用分批培养法培养中肋骨条藻（Ｓｋｅｌｅｔｏｎｅｍａｃｏｓｔａｔｕｍ），聚生毛角藻（Ｃｈａｅｔｏｃｅｒｏｓｓｏｃｉａｌｉｓｔ），小球藻（Ｃｈｌｏｒａｌｌａ），均可正常生长，说明在磷饥饿状态下，样品中潜在生物可利用磷可转化并释放到水相，以供藻类生长之需．培养体系中藻类对磷的摄取与磷自样品中的转化释放处于动态平衡状态．藻类在稳定生长期大量排出胞外产物．胞外产物中的强螯合基团与样品中铁等金属元素的络合作用，是培养体系中潜在生物可利用磷转化释放的可能机制之一．     

滨海土壤上杨树根际微区性状的研究

在滨海土壤上，杨树林地根标微区（根际土 ）的性状由于根系的吸水，选择性吸收离子，分泌有机等生理活动，发生了与非根际土不同的变化，根际土的ｐＨ值小于非根际土，而电导率，全盐，水溶性Ｋ＾＋则高于非根际土；上述变化以根系生理活动较为强烈的春、夏季节最为显著，而生理活动趋弱的秋季变化不太明显，由于脱盐程度不同，第一代杨树林地和第二代杨树林地根际土中Ｋ＾＋，Ｎａ＾＋，Ｃａ＾２＋，Ｍｇ＾２＋的比例有所差异。     

集聚科技创新和发展动力的中国海洋产业

本报道全面阐释了我国海洋资源产业的发展现状,包括政策响应、技术进展、对经济社会的贡献等,在分析当前存在问题的基础上,提出了对策与建议。未来海洋资源产业的发展应以统筹协调为目标,科技投入为基础,军民结合为手段,海洋技术的产业化为根本,立足发展现状,展望海洋资源产业的未来走向。     

山东海洋强省建设的目标分析与对策建议

山东是沿海经济大省,海洋资源丰富、产业基础扎实、科技力量雄厚,具有建设海洋强省良好基础。在海洋经济快速发展的同时,也存在科技优势发挥不突出、产业结构调整缓慢、资源环境压力较大等问题。要在海洋经济、海洋科技、海洋生态、海洋文化等方面明确目标,在强化创新驱动发展战略、加快产业结构战略性调整、加强生态文明建设、培育先进海洋文化等方面加大工作力度,全面推进山东海洋强省建设。     

古生界海相页岩储层井壁稳定影响因素分析

古生界海相页岩主要发育有水井沱组、鲁家坪组、牛蹄塘组以及五峰-龙马溪组等页岩储层。由于不同储层矿物成份、地质特征以及岩石力学特征不同,因而,会对井壁稳定产生不同的影响作用。通过对古生界海相页岩储层进行矿物成份、水化作用、岩石力学实验以及数值模拟,分析影响古生界海相页岩储层井壁稳定的因素,结果表明:1古生界海相页岩储层均不含易水化膨胀的蒙脱石;2古生界海相页岩储层具有非水敏性特征,水化作用不是影响井壁稳定的主要因素;3水基钻井液会降低古生界海相页岩储层岩石强度,降低幅度在6.4%~37.33%之间;4大倾角、层理弱面对井壁稳定有显著影响,会导致钻井液安全密度窗口会大幅减小。     

海上保险赔偿原则的法律解析

海上保险最为重要的环节是解决赔偿的问题,赔偿原则是海上保险法基本原则的逻辑终点.赔偿原则包括全部赔偿原则、及时赔偿原则和赔偿实际损失原则三个方面.从赔偿原则中,又可以派生出代位原则和分摊原则.代位原则包括物权代位和债权代位.     

Monstrilloids (Crustacea: Copepoda) from the Mediterranean Sea (Northern Adriatic Sea), with a description of six new species

Monstrilloid copepods collected during zooplankton surveys carried out over several years (2009–2016) in the Gulf of Trieste, northern Adriatic Sea, were examined. A total of seven species were found, of which six are undescribed, five of Cymbasoma and one of Monstrilla. These new species are described, illustrated and compared herein with its known congeners. Two of them are related to the C. rigidum species complex. One of these species is described based on both the male and the female; sexes were linked by identical details of the cephalic structure and the antennulary armature. Two previous reports of females attributed to C. tumorifrons from the Mediterranean relate to specimens that in fact belong to a new species, C. mediterranea. The most abundant species was M. grandis, which had a remarkable aggregation around the Trieste harbour in 2015. Male and female specimens of this assumedly widespread species were examined and the observed intra-specific morphological variability is reported and compared with previous illustrated reports; this nominal species probably this nominal species, probably represents a species complex. The addition of the new species here described brings the number of nominal species in the Mediterranean-Black Sea region to 26.

www.zoobank.org/urn:lsid:zoobank.org:pub:3D4B38E4-CCCD-4BD6-AC57-B59343A865F7     

The shore-dwelling Acari of the Isles of Scilly and the South-West Peninsula

Seventy-five species of Acari were collected from the littoral and supralittoral zones on a number of shores in the Isles of Scilly, Cornwall, South Devon and Dorset. Many of the species recorded are new records, or at least new shore records to the area. Vulgarogamasus halophilus (Willmann) (Parasitidae) is new to the British fauna.