Search results for "Axon"
showing 10 items of 2126 documents
The Structural Variety and Metabolism of Proteins
1994
Individual eukaryote cells contain in the order of 104 different proteins, and each animal species contains an even greater number due to differences between the tissues of an individual and between the individuals themselves; furthermore, the protein spectrum changes during the course of development. The number of different proteins to be found in extant organisms may be as high as 1012. The description of this variety, its origin and biological significance is the most extensive theme in comparative biochemistry. This chapter will concern itself with the possibilities for structural variation and the general metabolism of proteins; further chapters will deal with comparative studies of in…
Groundwater biodiversity in Europe
2009
18 páginas, 7 figuras, 4 tables et al
Review and a New Subfamily Placement of the Plant Bug GenusIsometocorisCarvalho and Sailer, 1954 (Hemiptera: Heteroptera: Miridae), with the Descript…
2015
Abstract The genus Isometocoris Carvalho and Sailer is reviewed and I. penicillus, new species, from Brazil is described. Diagnoses of the genus and included species I. blantoni Carvalho and Sailer and I. penicillus, n. sp., are given; a color adult habitus photo of both Isometocoris species, male genitalic drawings of Isometocoris penicillus n. sp., and scanning electron micrographs of selected structures of I. blantoni are provided; and an identification key is given to help distinguish the two included species. Isometocoris is transferred from the subfamily Psallopinae to the Cylapinae, where it is placed in the tribe Fulviini. Psallopinae is reduced to tribal level (Psallopini, new stat…
Fossil representatives of the family Greenideidae (Hemiptera, Aphidoidea) from the Miocene of Europe
2002
Abstract Four new aphid species (Hemiptera, Aphidoidea, Greenideidae) are described on the basis of imprints in oil-shales from the Miocene of Europe (Rubielos de Mora, Spain; Vishnevaya Balka 〚Stavropol〛, Russia): Eutrichosiphum europaeum nov. sp., Greenidea hispanica nov. sp., Greenideoida (Pentatrichosiphum) turolensis nov. sp. and Mollitrichosiphum rubusensis nov. sp. All the taxa are placed within recent genera of the subfamily Greenideinae. Miocene representatives of this subfamily have been found in the south of Europe. Later changes of climatic conditions limited its geographic range to south-eastern Asia, where it is now represented by over 130 species of seven genera.
<p><strong>Description and DNA barcoding of <em>Ochetostethomorpha</em> <em>secunda</em>, a new species of the So…
2014
Ochetostethomorpha secunda sp. nov. from Namibia, the second species of the South African endemic genus is described, illustrated, and compared with O. nollothensis Schumacher, 1913. The new species is the third of the subfamily Sehirinae known from Namibia. Moreover, a DNA barcode sequence was generated for this new species (827 bp of cytochrome oxidase I) and was deposited in GenBank.
Description of Two New Species of Anacharitinae (Hymenoptera: Figitidae) from the Afrotropical Region
2014
An revision of current knowledge on subfamily Anacharitinae for the Afrotropical Region is given. Two new species are described: Acanthaegilopsis hemicoriaceus Mata-Casanova & Pujade-Villar sp. n. and Xyalaspis subsaharica Mata-Casanova & Pujade-Villar sp. n. Diagnostic characters are illustrated and data about biology, distribution and morphological variability are discussed.
Pretarsal structures in the family Parastrachiidae (Hemiptera: Heteroptera: Pentatomoidea)
2010
Parastrachiidae, for a long time regarded as a subfamily within the Cydnidae (e.g., Schaefer et al. 1988; Schuh and Slater 1995; Gapud 1991), was raised to family level by Sweet and Schaefer (2002), and this position was then accepted by many heteropterists (e.g., Lis and Heyna 2001; Lis and Schaefer 2005; Hironaka et al. 2007; Schaefer and Kikuhara 2007; Lis 2010).
Molecular markers reflect differentiation of Fusarium oxysporum forma speciales on tomato and forma on eggplant
2013
Selective pressure induces pathogens to change their method of infection and, sometimes, causes species to become infectious. Pathogenic fungi must differentiate different morphological and physiological properties during the process of host specialization in their life cycle. In the present study, we conducted a genetic investigation and compared similarities within a generation of Fusarium oxysporum forma speciales (f. sp.) infecting tomato and forma (f.) infecting eggplants using selected ISSR and RAPD markers, two horticultural commodities belonging to the same taxon of the Solanaceae. Interestingly, genetic data showed that fungi belonging to F. oxysporum f. sp. infecting tomato have a…
Genetic cohesion of Eresus walckenaeri (Araneae, Eresidae) in the eastern Mediterranean
2005
The eresid spider genus Eresus is morphologically and ecologically conservative. At least three species occur in Europe. However, deep genetic divergence among geographical samples within two species, E. cinnaberinus and E. sandaliatus, may suggest more cryptic species. In the present study we investigate the genetic cohesion of the third species, Eresus walckenaeri, throughout its eastern Mediterranean distribution range, relative to the E. cinnaberinus–E. sandaliatus species complex. Eresus walckenaeri specimens were monophyletic. Genetic discreteness of E. walckenaeri in a region of sympatry with its sister species in Greece provides evidence for species integrity of E. walckenaeri withi…
Overestimation of the strength of size-assortative pairing in taxa with cryptic diversity: a case of Simpson's paradox.
2015
5 pages; International audience; Size-assortative pairing is one of the most common pairing patterns observed in nature and it probably occurs in many taxa with cryptic diversity. Observed patterns of size-assortative pairing in natural populations may thus be influenced by the co-occurrence of noninterbreeding cryptic groups of individuals living in sympatry. To quantify this potential bias, we sampled amphipods from the Gammarus pulex/Gammarus fossarum crustacean species complex in rivers containing two sympatric and morphologically cryptic groups, i.e. molecular operational taxonomic units (MOTUs). Within each river, MOTUs did not interbreed and differed in mean body size. We measured th…