电厂温排水中余氯浓度预测

利用有限元分步杂交方法,对胶州湾海域潮流场进行了数值模拟。考虑余氯在水体中的化学反应,利用前人大量实验成果选取余氯衰减系数,建立胶州湾余氯的二维输运-扩散模型,并将此模型应用于青岛市黄岛发电厂三期温排水工程,预测了温排水中余氯的浓度分布及影响范围,为电厂冷却水排放口邻近水域的生态环境保护提供依据。     

Fast clogging problem of open check dams and a new type suggestion:curved footed type open check dam

Driftwood is one of the important physical components in mountainous rivers which causes severe hazards due to the clogging of bridges, culverts,and narrow sections during floods. Therefore, the understanding of driftwood dynamics and mitigation measures are crucial for managing wood in rivers.Open check dams are the most commonly used engineering measure for preventing driftwood from reaching downstream areas. Nevertheless, these open check dams frequently lose their sediment transport function...     

钝顶螺旋藻多糖提取工艺的研究——三氯乙酸(TCA)法的正交实验优化

研究了用三氯乙酸(TCA)脱除蛋白质提取钝顶螺旋藻(Spirulina platensis)多糖的工艺,并以提取率、样品糖含量与蛋白含量为指标,应用正交实验设计优化了提取液pH值、提取温度及提取时间3个因素。结果表明,在提取液pH值为12、提取温度为90℃及提取时间为8h的最佳条件下,所得螺旋藻多糖为白色粉末,提取率为3.10%,糖质量分数为81.79%,蛋白质量分数为0.57%。     

Identification and distribution of gonadotropin-releasing hormone-like peptides in the brain of horseshoe crab Tachypleus tridentatus

Gonadotropin-releasing hormone(GnRH) is a crucial peptide for the regulation of reproduction.Using immunological techniques,we investigated the presence of GnRH in horseshoe crab Tachypleus tridentatus.Octopus GnRH-like immunoreactivity,tunicate GnRH-like immunoreactivity,and lamprey GnRH-like immunoreactivity were detected in the neurons and fibers of the protocerebrum.However,no mammal GnRH-like immunoreactivity or lamprey GnRH-Ш-like immunoreactivity was observed.Our results suggest that a GnRH-like factor,an ancient peptide,existed in the brain of T.tridentatus and may be involved in the reproductive endocrine system.     

血蓝蛋白功能研究新进展

血蓝蛋白是位于节肢动物和软体动物血淋巴中的含铜呼吸蛋白,脱氧状态为无色,结合氧状态为蓝色。业已证明,节肢动物和软体动物的血蓝蛋白在分布、氨基酸序列和空间结构上均存在较大差异[1]。节肢动物门血蓝蛋白主要存在于螯肢类、甲壳类、多足类和蜘蛛类中[2],一般由3~8个不同的     

凹顶藻属海藻化学成分研究进展

海洋生物通过生物链、化学信息传送、化学进攻、化学防御等机制相互依存、相对独立、维系着独特紧密的海洋生物体系,作为海洋物质代谢原动力的海藻为了对抗食藻动物的吞食,大多能产生一些有特色的代谢物质,其中凹顶藻属因富含萜类化合物著称,这类化合物含有异戊二烯结构单元,不     

Effects of stand types on recreational preferences of society in the Sub-Alpine Zone,northern Turkey

The main objective of this study was to examine how different stand types influenced the tendency of visitors for varying recreational activities(i.e., hiking, trekking, camping and hunting) from 1993 to 2018 in the surrounding areas of Uluyayla Natural Recreation Site in Bart1n, northern Turkey. A total of 627 visitors were selected on a voluntary basis,and questioned in the form of questionnaire. Most of the participants were in the age of 21-40 years old,and they were mostly(62.4%) male. Most...     

两种微藻凝集素对几种不同类型细胞的凝集作用

经离子交换和分子筛层析从紫球藻（Porphyridium cruentum）和海水小球藻（Chlorella sp．）中分离纯化得到2种凝集素,研究它们对几种不同类型细胞即动物和人血红细胞、海洋和淡水微藻、细菌和真菌的凝集活性。研究结果表明,2种微藻凝集素对它们当中一些类型的细胞或种类具有不同程度的凝集活性,其中对水生聚胞藻（Synechocystis aquetilis）的凝集活性最强,最低质量浓度只需0．0313g／L。     

方格星虫属动物的研究进展

方格星虫纲（Sipunculidea Hasehek,1883）方格星虫目（Sipunculiformes Cutler et Gibbs,1985）方格星虫科（Sipunculidae Quatrefages,1865）方格星虫属（Sipunculus Linnaeus,1766）动物广泛分布于大西洋、太平洋、印度洋、地中海、红海和加勒比海等海域。全世界11种,我国5种,主要分布于东南沿海。     

锯缘青蟹视神经节免疫细胞化学研究

采用兔抗哺乳类血清,应用链霉菌抗生物素蛋白-过氧化物酶免疫细胞化学技术,观察了锯缘青蟹视神经节中5羟色胺、胰高血糖素、神经肽Y和生长抑素免疫阳性细胞和神经纤维的形态和分布,结果发现,视神经节的4个神经髓均有5羟色胺免疫阳性细胞,除X器检出1个较大型阳性细胞外,其余均为小型细胞.视外髓、视内髓和视端髓都具有胰高血糖素免疫阳性细胞,视端髓的神经髓质阳性染色深,X器中阳性细胞成群分布,窦腺免疫阳性反应强.神经肽Y免疫阳性细胞在视神经层和视外髓为小型阳性细胞,在视内髓和视端髓检出较大型阳性细胞,另有小型阳性细胞散布于X器中.生长抑素免疫阳性细胞分布于4个神经髓,数量少.4种免疫阳性物的特异性分布模式,可为其不同的神经生理作用提供形态学证据.