Heterospecific mating between distantly related species of stink bugs and its evolutionary implications

The copulatory process in animals is preceded by a series of integrated communication processes which are often under selection to guarantee species-specific courtship and copula. However, individuals of species supposedly in reproductive isolation frequently copulate in nature, which has sparked the attention of evolutionary biologists for decades. While studies on this topic have strongly focused on recently diverged species or populations, few instances of heterospecific copula between distantly related species are known. Here we report an intriguing case of interspecific copula between two distantly related species of stink bugs in nature. We replicated this observation in laboratory conditions and revealed an asymmetric relation: males of Chinavia obstinata copulated with females of C. erythrocnemis but the reverse combination did not occur. We propose a series of hypotheses to explain our observations in the light of the current knowledge on mate recognition and reproductive isolation in stink bugs, considering the potential pre- and postcopulatory barriers involved. Once these two species have probably evolved in allopatry and contacted secondarily, the absence of directional selection against mating signals differentiation is a probable process. We argue that similarities in genital shape and size, most likely a result of convergent evolution, may have played a fundamental role in guaranteeing that these species achieved proper coupling.     

Filamentous bodies in human glomerulonephritis

Filamentous bodies have been identified in the glomerular cells of human kidney biopsies. These structures have a close morphological resemblance to ciliary rootlets, although the cells of the glomerular tuft only occasionally bear cilia. Their significance could be, as for cilia, of a cellular disdifferentiation of a pathological cellular proliferation.     

Identification of Megaselia scalaris (Loew, 1866) (Diptera: Phoridae) in mummified human body from Itacambira (MG), Brazil,using scanning electron microscopy and cuticular hydrocarbons

Insect puparia were found adhered to the ribs and other tissues in the abdominal cavity of a natural male mummy found in Itacambira (State of Minas Gerais, Brazil) dating to the Colonial Period. They were collected for identification by scanning electron microscopy, and for comparison of several morphological features with those described in the literature. The puparia were found open and dorsoventrally flattened, making it difficult to visualize the dorsal projections. The tegument is covered by tapered spines and contains rows of small tubercles on the dorsal and lateral regions of the puparium. The posterior spiracle consists of four parallel openings arranged in pairs. These results are indicative that the specimens belong to the species Megaselia scalaris (Loew, 1866) (Diptera: Phoridae). Additionally, cuticular hydrocarbons of the puparia were analysed by gas chromatography coupled to mass spectrometry and compared with the profile of M. scalaris reared in the laboratory.     

世界各国巨型机发展概况

以全球前500台超级计算机(TOP500)评选结果为依据，简述了世界各国巨型机的发展概况，以及我国在巨型计算机发展方面与发达国家的差距。     

生物电脑的最新进展

评述了半导体芯片计算机的致命弱点，综述了生物电脑的基本工作原理、应用前景以及最新进展。     

Participative Methodology for Local Development: The Contribution of Engineers Without Borders from Italy and Colombia: Towards the Improvement of Water Quality in Vulnerable Communities

This paper presents a systemic methodology by which engineering is put to use in vulnerable communities through applied technological research and the main results of its application. The methodology presented corresponds to one implemented and designed by two groups of Engineers without Borders in Europe and Latin America, to integrate technical know-how with local context in communities with water problems in Colombia and the Democratic Republic of Congo. The main results of this methodology are related to the improvement of the living conditions of vulnerable groups thanks to the integration of the communities?? knowledge with engineering know-how, leading to autonomous communities and engineering professors and students learning from real life problems to enrich applied sciences.     

盲人《视唱练耳》教学探究

运用二十年来从事特殊教育本科视唱练耳教学的成功经验，把对盲人视唱练耳教学采用的、与普通高等院校音乐专业不同的教学方案，从教学课时安排、教学环节、教学实践、教学内容等方面作了认真细致的研究与总结，并对视唱练耳教学的链接与相关课程的安排作出了有意义的讨论。     

邻菲啰啉体系测量Fe（Ⅲ）的双峰单波长分光光度法研究

本文采用双峰单波长分光光度法测定Ｆｅ（Ⅲ），具有较高的灵敏度（ε＝５．５４×１０４Ｌ·ｍｏｌ（－１）·ｃｍ（－１）），常见离子干扰少，重现性好。对固体饮料和辽河水中Ｆｅ（Ⅲ）进行测定，回收率分别在９７．３—１０４．０％和９７．７—１０２．０％。