牙鲆胃肠道及肝脏GnRH受体的免疫组织化学研究

利用免疫组织化学ABC法，对牙Ping胃肠道及肝脏促性腺激素释放激素（GnRH）受体的表达及分布特点进行了研究。结果显示：胃肠道粘膜上皮、腺上皮及肝细胞呈GnRH受体免疫反应阳性，阳性反应物分布在细胞膜和细胞质中，细胞核呈阴性反应。提示：牙Ping胃肠道上皮细胞及肝细胞能够表达GnRH受体，说明GnRH可能通过其受体影响牙Ping消化系统的功能。     

南方池养牙鲆全人工配合饲料饲养试验

采用全人工配合饲料(试验组饲料)与湿颗粒饲料 (对照组饲料 )对南方池养牙鲆进行为期 204d的饲养试验.结果表明,试验组与对照组牙鲆的尾相对增重率分别为 2 304%、2 297%,尾平均日增重差异不大,平均饲料系数分别为 1. 56、2. 58,牙鲆增重 1kg所需饲料成本分别为 10. 92元和 13. 55元,试验组比对照组节省饲料成本2. 63元 /kg鱼增重;试验组与对照组牙鲆平均内脏比 (分别为 6. 50%、6. 38% )、平均丰满度(分别为 1. 09、1. 07)、肌肉粗蛋白含量、粗脂肪含量等差异不显著(p>0. 05),10种必需氨基酸和 5种鲜味氨基酸的含量很接近.由此可见,南方池养牙鲆采用全人工配合饲料饲养是完全可行的.     

Effect of estradiol-17β on pituitary-thyroidal axis of Japanese eel (Anguilla japonica)

In teleost sPeCies, it is well accepted that estradiol--l75 (E2 )is generated from ovarian fOl-licles stimulated by pituitary gonadOtropins (GTH) (Nagahama, l987). FUrthermore, E2 canstimulate hepatic vitellngenesis and elevate plasrna yOlk protein precursor vite1lOgenin, totalCa and W levels in several teleosts (KorSgaard and Petersen, l976, l978; Whiteheadet al., l978; Elliott et al., l979; Pertersen et al., l983; Wallace, 1985; tapigliati etal., 1999). On the other hand, many stud…     

Assembling “Japantown”? A critical toponymy of urban dispossession in Vancouver,Canada

Geographic scholarship in critical toponymy has highlighted the importance of place naming as a form of discursive power within processes of urbanization. This paper builds on such literature and advances a novel theory of toponymic assemblage to interpret findings from a participatory research project in the Downtown Eastside of Vancouver, Canada. We foreground neighborhood history in the form of a Japanese Canadian enclave and its wartime uprooting and dispossession, and trace the historical antecedents of a resurrected toponymy of “Japantown” that has appropriated and renarrated Japanese Canadian history to facilitate further rounds of dispossession. Using a genealogical method, we highlight three “moments” of Japanese Canadian uprooting, return, presence, and activism, demonstrating how toponymies are assembled in place in heterogeneous and historically contiguous ways. This approach expands on current research in critical toponymy, offering a novel methodology for exploring the enrolment of toponymy, discourse, and materiality in the formation of place.     

Soil erosion and overland flow in Japanese cypress plantations: spatio-temporal variations and a sampling strategy

ABSTRACT

Many studies have focused on soil erosion in unmanaged Japanese cypress plantations because the sparse understory vegetation and litter covering the forest ground enhance soil erosion. In this study, soil erosion, litter, and overland flow measurements were conducted over 14 months to identify the spatio-temporal variation and examine the optimal sample size. Fifteen traps (each 0.25 m wide) were installed in line along the bottom of a 15-m-wide slope. Soil erosion and overland flow had large spatial variations as compared to litter. The temporal coefficient of variation of soil erosion and overland flow was highest during dry seasons, while smaller during wet seasons. The random sampling analysis showed that the rate of decrease in spatio-temporal variation became moderate as the sample size increased beyond six. This result indicated that the optimal sample size was five, the total width of which was equivalent to about 8% of the monitored slope width.     

INTERDECADAL SEA LEVEL VARIATION AT THE JAPANESE COAST AND LARGE SCALE CLIMATE STATE

Thirty years of monthly mean anomalies of sea level(SL) at 15 Japanese coastal stations, sea sur-face temperature (SST) and sea level pressure (SLP) in or over the northern Pacific were analyzed bycanonical correlation analysis (CCA) to study the relationship between the interdecadal SL variationand large scale climate state. Given two time-varying fields this technique identifies the pair ofspacial patterns with optimally correlated time series.The results show that there are two important air-sea interactive processes in the extratropicalPacific region for the variation of the SL at the Japanese coast on interdecadal scale. One is theocean heating or cooling of the atmosphere over the Kuroshio extension region, which results in ahuge SLP anomalous vortex with planetary spacial scale big enough to change the global climate. An-other is the large Kuroshio meander phenomenon controlled by the large-scale wind-stress curls oneyear earlier in the adjacent region of the Hawaiian Islands. The first process im     

日本俯冲带应力产生与传播的数值模拟

用三维有限元模拟了日本地冲带，分析了板块推力、板块拉力、动态闭锁断层和解耦板间地震对上覆板块内部应力状态的贡献，表明大洋板块推力是海沟。岛弧地区挤压应力的主要来源，这种应力仅有小部分传播到上覆板块内部，软流圈的蠕变能促进这个应力传播过程使岛弧区的应力增大，由密度差异引起的板块拉力产生了分散的挤压应力和拉张应力。断层闭锁导致应力局部集中，板间地震的断层错动只对破裂附近小范围的应力状态产生影响     

Procedure of reduction of travel-time curves ofP andS waves at the focal surface

A method for the calculation of seismic waves velocities at focal depth is here proposed. A stratified earth model with spherical symmetry and the analytical relationship between the epicentral distance and the travel times of seismic waves are used.This method, applied to the southern Tyrrhenian region and to the Japanese islands, allows to reduce the observed travel times to the focal depth independently of a particular velocity model.     

西北太平洋海域太平洋褶柔鱼秋生群产卵场指数动态评估

为探究太平洋褶柔鱼(Todarodes pacificus)秋生群资源丰度波动的原因,本研究利用适宜产卵的海表温度(SST)和水深数据,构建了太平洋褶柔鱼秋生群1979—2018年40年潜在产卵场模型,在此基础上开发了适宜海表温度均值(MVSS)、适宜性海表温度加权面积(SSWA)和等温线经向位置(MP)3种产卵场指数...