猫纹状皮层神经元整合野亚区结构和亚区间的空间总合特性

用正弦调制的光栅图形研究了猫纹状皮层神经元传统感受野外区域(整合野)的亚区结构,整合野不同亚区的作用可表现为抑制或易化。根据端区和侧区的作用性质,整合野有4种不同的结构形式。在端区和侧区的内部以及在这两个区域之间,空间总合显示非线性特性。其非线性程度随刺激面积的增加而变大,表明在整合野的亚区内和亚区间存在着相互抑制。     

Nationalism and Belonging in India,Pakistan and South Central Asia: Some Comparative Observations

The criteria invoked in the definition of national identity are commonly derived from contexts other than those of the nation-state itself—most notably those of territoriality, language/culture, kinship/descent and religion. It therefore follows that in seeking to understand the kind of identity or belongingness invoked in a particular instance of national ideology it is necessary to explore not only the kind of nation-state envisaged, but also those non-national forms of belonging or community from which the national ideology may itself be historically derived. In this paper I seek to develop this argument by comparing some of the principal forms of nationalism found in India, Pakistan and Central Asia. I pay particular attention to the importance of the concept qawm, which in Pakistan, Afghanistan and elsewhere in Central Asia, is used to refer to a wide variety of groups to which people owe allegiance. Such usages alert us to the important fact that the nation, as ‘imagined community’, may have its origins as a political movement among sentiments and allegiances which draw on pre-modern social arrangements and are in tension with ‘nationalist’ exclusivism. Even when the nation (as nation-state) has been secured, so-called ‘nationalist’ revivalism, while taking the nation for granted, may in fact appeal to sentiments of a different kind.     

A NEW SPECIES OF GENUS HABROPHLEBIODES ULMER (EPHEMEROPTERA: LEPTOPHLEBIIDAE)

Abstract  The present paper deals with a new species Habrophlebiodes zijinensis sp. nov. collected in Nanjing, Jiangsu Povince, China.     

Detection of extracellular proteinase of Pseudomonas fragi by enzyme-linked immunosorbent assay

A double-antibody-sandwich, enzyme-linked immunosorbent assay was developed to detect an extracellular proteinase produced by Pseudomonas fragi. The method was capable of detecting 4 g/ml of the proteinase in spiked samples of buffer and broth and 4.2 g/ml in a broth culture of the organism. The assay detected the presence of proteinase at bacterial densities of approximately 10⁴ cfu/ml, which develop after incubation for 15 h at 25°C in a broth medium. All assays could be completed within 7 h. This assay is of value in plotting proteolytic expression in relation to the growth cycle of Ps. fragi in broth culture and may be of value, with development, in other more complex milieux.     

Uptake by central nervous tissues as a mechanism for the regulation of extracellular adenosine concentrations

The various facets of the uptake of adenosine by central nervous tissues are described. The uptake process includes the transport of nucleoside across neuronal and glial plasma membranes and its metabolism within the cell. Much of the transported adenosine is phosphorylated into adenosine nucleotides. Inhibitors of adenosine uptake increase extracellular levels of adenosine and can thus potentiate its pharmacological actions. This may be an important component in the actions of various groups of psychoactive drugs.