鳗鲡气单胞菌引起的烂尾病病原菌抑菌药物的研究   总被引：5，自引：0，他引：5  

樊海平  陈茂辉 《海洋湖沼通报》1995,(4):61-65

应用药敏纸片法研究了三株烂尾病病原菌（气单胞菌）对３１种药物及不同配合药物的敏感性，测定了４种药物及配合药物ＨＰ对三株菌的最低抑菌浓度（ＭＩＣ）及最低杀菌浓度（ＭＢＣ）。结果表明，配合药物ＨＰ具较强的抑菌能力。  相似文献   

Preparation of a New Geological Survey of Japan Geochemical Reference Material: Coral JCp-1   总被引：2，自引：0，他引：2  

Takashi Okai  Atsushi Suzuki  Hodaka Kawahata  Shigeru Terashima  Noboru Imai 《Geostandards and Geoanalytical Research》2002,26(1):95-99

A new geochemical reference material, coral Porites sp. JCp-1 has been prepared by the Geological Survey of Japan (GSJ). Provisional values for twenty one major, minor and trace elements are presented. The homogeneity tests showed that all elements studied are considered to be homogeneously distributed.  相似文献   

寒武纪早期澄江生物群小细丝海绵属新材料     

杨继媛  马海丹  陈爱林  侯先光 《高校地质学报》1997,25(3):474

文章描述了云南寒武纪早期澄江生物群小细丝海绵属一新种——螺旋小细丝海绵（Leptomitella spiralis sp. nov.）。新种 具有横向骨针束围绕海绵体呈螺旋状排列的典型特征，明显区别于属内其他种；此外，在外部形态和骨针类型上与属内其他种 也存在较大差异。新种的发现增加了Leptomitella种间形态结构的多样性，也为海绵动物的早期演化及寒武纪海绵动物辐射演 化研究提供新的化石资料。  相似文献   

P–T–f_O2 controls on a partly inverse chromite-bearing ultramafic intrusive: an evaluation from the Sukinda Massif, India     

Tapan Pal  Sachinath Mitra 《Journal of Asian Earth Sciences》2004,22(5):483

The chromites from the alpine type ultramafic intrusive of Sukinda, India, display a typical partly inverse spinel form and occur in two distinct zones: Brown Ore Zone (BOZ) and Grey Ore Zone (GOZ). The host ultramafites are mostly altered and are represented by the serpentinite, tremolite-talc(chlorite) schist, talc-serpentine schist and chlorite rock. The less altered variants are dunite, harzburgite and websterite. A dyke of orthopyroxenite runs through the main ultramafic body.The composition of olivine (Fo₉₂), orthopyroxene (En_92–89) and Al₂O₃ contents of the parental liquid (10.40–11.45%) determined from chromites, suggest that the parent melt is of boninitic affinity. The chemical plot of TiO₂ content against cr# of chromites corroborates a boninitic parental melt. The Fe–Mg partitioning in olivine and chromite depicts the temperature for chromitites as 1200 °C. A compositional plot of mg# and cr# suggests crystallization at high pressure conditions, corresponding to the kimberlite xenolith field. From the P–T diagram of pyrolite melting and mineral assemblage, the pressure of crystallization is stipulated to be ≥1.2 GPa. The f_O2 values estimated from Fe³⁺/Cr+Al+Fe³⁺ ratios range from 10^−8.3 to 10^−9.3 for the GOZ and 10^−7.1 to 10^−7.3 for the BOZ. The f_O2 values together with the pressure range suggest crystallization at upper mantle conditions. The heterogeneity in chemical composition and f_O2 conditions for the GOZ and BOZ could be linked to heterogeneity in the upper mantle.  相似文献   

The first araripeneurine antlion in Burmese amber (Neuroptera: Myrmeleontidae)     

《Cretaceous Research》2016

Burmaneura minuta gen. et sp. nov., the first araripeneurine antlion in amber, is characterized, described and compared with the modern and Mesozoic Myrmeleontidae. The precise position of the fossil within this group is debatable. Interestingly, despite a rather rich fossil record, all Mesozoic Myrmeleontidae belong to subfamilies that are not recorded in the Cenozoic, although this might merely reflect the artificiality of the classification as the extinct groups may be paraphyletic with respect to their younger counterparts (e.g., Araripeneurinae may very well be nothing more than a stem group of no classificatory value).  相似文献   

Distribution and relative density of cetaceans in the Hauraki Gulf,New Zealand     

SL Dwyer  DM Clement  MDM Pawley  KA Stockin 《新西兰海洋与淡水研究杂志》2016,50(3):457-480

Understanding species distributions, and how they change in space and time, is vital when prioritising conservation or management initiatives. We assessed the distribution and density patterns of common dolphins (Delphinus sp.), bottlenose dolphins (Tursiops truncatus) and Bryde’s whales (Balaenoptera edeni) in the Hauraki Gulf, New Zealand. Dedicated boat-based surveys were conducted in the inner Hauraki Gulf (IHG) and off Great Barrier Island (GBI) during 2010–2012. Generalised linear models were used to investigate temporal changes in relative densities and kernel density estimation was implemented to examine spatial trends. Common dolphins were widely distributed during all seasons, with higher densities observed during winter and spring in the IHG but during autumn off GBI. There was inter-annual variation in Bryde’s whale distribution, with high densities recorded off GBI in 2011. Bottlenose dolphins were infrequently sighted in the IHG but regularly encountered off GBI, with the highest densities during spring and summer.  相似文献   

莱州湾拟哲水蚤Paracalanus sp.发育期丰度组成和个体大小季节变化     

左涛  王俊  王秀霞 《海洋学报》2016,38(10):94-104

拟哲水蚤是莱州湾桡足类中周年出现的优势种;是上层鱼类幼鱼早期开口饵料的重要贡献者;掌握其种群动态分布特点;有利于了解湾内生物环境状况、次级生产力生产水平。基于2011年5月至20 12年4月采集的浮游生物资料的分析结果显示;莱州湾拟哲水蚤的发育期丰度组成和个体大小均表现了明显的季节变化。调查季节中;4-6月以成体居多;其他季节以桡足幼体CⅢ-CⅤ较多;其中10-11月和3月主要由后期桡足幼体CⅣ和CⅤ期构成。成体中以雌体为主导;雌/雄比介于1.46~9.62;该比值在3-4月最低;10-11月最高。拟哲水蚤各期桡足幼体和成体个体大小以4-5月最大、8月最小;并与水温表现出明显的负相关。拟哲水蚤桡足幼体和成体的总生物量月变化与丰度变化相同;即以8月值最高;3-5月值最低;月均值为2.69 mg/m3（以碳计）;日生产力估算值为0.74 mg/（m3·d）（以碳计）。由上述结果;推测莱州湾拟哲水蚤的种群结构周年变化主要可分3个阶段;4-6月是莱州湾拟哲水蚤开始繁殖期;7-8月为种群数量快速增长期;9月之后为种群增长相对停滞期。  相似文献   

一株海绵附生芽孢杆菌的抗硅藻附着活性成分的分离鉴定     

吴珊  俞思羽  姜薇  张立奎  靳翠丽  周晓见 《海洋科学》2016,40(7):23-32

为寻找天然抗污损活性化合物,以抗硅藻附着活性为导向,采用有机溶剂萃取、半制备高压液相色谱对分离自海绵的芽孢杆菌UST050418-715代谢产物进行分离,纯化抗硅藻附着活性物质,并利用气相色谱-质谱联用仪、核磁共振波谱分析活性物质结构。从菌株UST050418-715代谢产物中分离得到7种具有抗硅藻附着活性的环二肽类化合物,分别鉴定为:(1)环(L-亮氨酸-反式-8-羟基-L-脯氨酸-)、(2)环(L-缬氨酸-L-脯氨酸)、(3)环(D-脯氨酸-L-亮氨酸)、(4)环(L-脯氨酸-D-亮氨酸)、(5)环(甘氨酸-L-脯氨酸)、(6)环(L-苯丙氨酸-顺式-8-羟基-D-脯氨酸-)、(7)环(L-苯丙氨酸-反式-8-羟基-L-脯氨酸-)。说明海绵附生芽孢杆菌UST050418-715代谢产物中存在大量环二肽类化合物,可以帮助宿主海绵实现对硅藻附着的化学防御。  相似文献   

New polymorphic psyllipsocids from Burmese amber (Psocodea: Psyllipsocidae)     

《Cretaceous Research》2018

Annulipsyllipsocus andreneli gen. et sp. nov. and A. inexspectatus gen. et sp. nov., the first records of the Psyllipsocidae from the Cretaceous amber of Myanmar are described, illustrated and their taxonomic position discussed. The new genus is characterized by antennae with 16 segments; flagellomeres with secondary annulations; radial cell closed, five-angled, bulged on its R1 border; triangular pterostigma. Species belonging to Annulipsyllipsocus gen. nov. are polymorphic. The described taxa represent the earliest evidence for polymorphism in Psocodea. A checklist of all known species of Psyllipsocidae is given.  相似文献   

红鳍东方鲀(Takifugu rubrips)病原杀对虾弧菌的主要生物学特性研究     

秦国民  张晓君  陈翠珍  房海  阎斌伦  徐静 《海洋与湖沼》2008,39(3):228-233

采用表观分类学及分子生物学方法,对从发病的养殖红鳍东方()中分离的细菌进行了主要生物学特性研究.主要包括形态特征、理化特性等较系统的表观分类学指征鉴定;同时对代表菌株进行了16S rRNA基因的分子鉴定,测定了16S rRNA基因序列、分析了相关细菌相应序列的同源性、构建了系统发生树;结果表明,分离菌为弧茵属(Vibrio Pacini 1954)的杀对虾弧菌(Vibrio penaeicidasp.nov.Ishimaru et al 1995).代表菌株(Hc051105-6株)16s rRNA基因序列长度(不包括引物结合区)为1443bp(GenBank登录号:EU073023),代表菌株(HC051105-8株)16S rRNA基因序列长度(不包括 引物结合区)为1450bp(GenBank登录号:Eu073024).择代表菌株做对健康红鳍东方鲀的人工感染试验,认为分离鉴定的杀对虾弧菌在被检红鳍东方鱼电病例具有一定的病原学意义.药敏试验结果显示,对供试37种抗菌药物中,在一些药物中存在耐药性的菌株间差异.  相似文献