Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Comparative analysis of early ontogeny in Bursatella leachii and Aplysia californica  [PDF]
Zer Vue,Bishoy S. Kamel,Thomas R. Capo,Ana T. Bardales,Mónica Medina
PeerJ , 2015, DOI: 10.7717/peerj.700
Abstract: Opisthobranch molluscs exhibit fascinating body plans associated with the evolution of shell loss in multiple lineages. Sea hares in particular are interesting because Aplysia californica is a well-studied model organism that offers a large suite of genetic tools. Bursatella leachii is a related tropical sea hare that lacks a shell as an adult and therefore lends itself to comparative analysis with A. californica. We have established an enhanced culturing procedure for B. leachii in husbandry that enabled the study of shell formation and loss in this lineage with respect to A. californica life staging.
Takecallis arundinariae (Essig) (Aphididae, Drepanosiphinae, Phyllaphidini): first record in Brazil and comparison to Takecallis taiwanus (Takahashi)
Lazzari, Sonia Maria Noemberg;Zonta de Carvalho, Regina Celia;Cardoso, Josiane Teresinha;
Revista Brasileira de Zoologia , 1999, DOI: 10.1590/S0101-81751999000300023
Abstract: this paper reports the first record of a bamboo aphid takecallis arundinariae (essig, 1917) on bamboo plants in curitiba, paraná, brazil. specimens were also collected in yellow pan traps from june-august (fall-winter), and a few specimens from october-december (late spring-early summer). individuals were found feeding on the underside of leaves, parallel to the veins on dendroclamus sp. and merostachys sp. (bambusoideae). individuals collected were represented mainly by alate viviparous females bearing a characteristic clypeus with an anterior tubercle. a brief diagnosis and morphometric data are presented to distinguish t. arundinariae from takecallis taiwanus (takahashi, 1926), another bamboo aphid recorded recently in brazil. t. arundinariae is a medium-sized pale yellow aphid, distinguished by a series of elongate black spots on the abdominal tergites and found mainly on mature bamboo leaves. t. taiwanus is pale green and has been found on young leaves and shoots.
The Centenary Of Saratov Anatomical School (1909-2009)  [PDF]
P.V. Glybochko,V.N. Nikolenko
Saratov Journal of Medical Scientific Research , 2009,
Abstract: The article presents the history of department of human anatomy at Saratov State Medical University. The department was opened in September, 1909. The stages of its development and the history of scientific school formation are highlighted in this work.
Comparative transcriptomics among floral organs of the basal eudicot Eschscholzia californica as reference for floral evolutionary developmental studies
Laura M Zahn, Xuan Ma, Naomi S Altman, Qing Zhang, P Kerr Wall, Donglan Tian, Cynthia J Gibas, Raad Gharaibeh, James H Leebens-Mack, Claude W dePamphilis, Hong Ma
Genome Biology , 2010, DOI: 10.1186/gb-2010-11-10-r101
Abstract: Using a recently generated expressed sequence tag (EST) set, we have designed an oligonucleotide microarray for the basal eudicot Eschscholzia californica (California poppy). We performed microarray experiments with an interwoven-loop design in order to characterize the E. californica floral transcriptome and to identify differentially expressed genes in flower buds with pre-meiotic and meiotic cells, four floral organs at pre-anthesis stages (sepals, petals, stamens and carpels), developing fruits, and leaves.Our results provide a foundation for comparative gene expression studies between eudicots and basal angiosperms. We identified whorl-specific gene expression patterns in E. californica and examined the floral expression of several gene families. Interestingly, most E. californica homologs of Arabidopsis genes important for flower development, except for genes encoding MADS-box transcription factors, show different expression patterns between the two species. Our comparative transcriptomics study highlights the unique evolutionary position of E. californica compared with basal angiosperms and core eudicots.The eudicots are believed to have originated approximately 130 million years ago [1]. They include about 70% of all flowering plant species and consist of core eudicots [2-4], which include the groups containing Arabidopsis thaliana and Antirrhinum majus, and species that branched earlier from these groups and are at basal positions within the eudicot clade. The earliest branching lineage of the eudicots, the Ranunculales, contains the Papaveraceae (poppy) family, of which Eschscholzia californica (California poppy) is a member [3]. The core eudicots commonly have stable (that is, canalized) flower architecture (Figure 1a); by contrast, the basal eudicots exhibit a wider range of floral patterns [5] (see examples in Figure 1a). Comparing the morphology and the underlying mechanisms of flower development between the core and basal eudicots may help us better u
Urotensin II in Invertebrates: From Structure to Function in Aplysia californica  [PDF]
Elena V. Romanova,Kosei Sasaki,Vera Alexeeva,Ferdinand S. Vilim,Jian Jing,Timothy A. Richmond,Klaudiusz R. Weiss,Jonathan V. Sweedler
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0048764
Abstract: Neuropeptides are ancient signaling molecules that are involved in many aspects of organism homeostasis and function. Urotensin II (UII), a peptide with a range of hormonal functions, previously has been reported exclusively in vertebrates. Here, we provide the first direct evidence that UII-like peptides are also present in an invertebrate, specifically, the marine mollusk Aplysia californica. The presence of UII in the central nervous system (CNS) of Aplysia implies a more ancient gene lineage than vertebrates. Using representational difference analysis, we identified an mRNA of a protein precursor that encodes a predicted neuropeptide, we named Aplysia urotensin II (apUII), with a sequence and structural similarity to vertebrate UII. With in-situ hybridization and immunohistochemistry, we mapped the expression of apUII mRNA and its prohormone in the CNS and localized apUII-like immunoreactivity to buccal sensory neurons and cerebral A-cluster neurons. Mass spectrometry performed on individual isolated neurons, and tandem mass spectrometry on fractionated peptide extracts, allowed us to define the posttranslational processing of the apUII neuropeptide precursor and confirm the highly conserved cyclic nature of the mature neuropeptide apUII. Electrophysiological analysis of the central effects of a synthetic apUII suggests it plays a role in satiety and/or aversive signaling in feeding behaviors. Finding the homologue of vertebrate UII in the numerically small CNS of an invertebrate animal model is important for gaining insights into the molecular mechanisms and pathways mediating the bioactivity of UII in the higher metazoan.
Las campa as de Marruecos (1909-1927)
Daniel Macías Fernández
Revista Universitaria de Historia Militar On-line , 2013,
Abstract: Resumen.En este artículo se pretende analizar la situación en la cual se vieron envueltas las tropas espa olas destinadas a “pacificar” el Protectorado Espa ol en Marruecos entre 1909 y 1927, a saber, la dureza del escenario de operaciones y las resistencias de los nativos frente al colonizador europeo, que fueron las principales características de las guerras coloniales norteafricanas. Palabras clave: Espa a; Marruecos; Protectorado; Guerra del Rif; Ejército.Abstract.We are going to analyze the situation which involved those militias who went to the Spanish Protectorate between 1909 and 1927. That is, the hardship of the scene of operations and the persistent and multiple resistances put up by the natives against the colonial penetration, which were the principal characteristics of the Moroccan Wars.
Aid Works After 1909 Adana Events
Necla Günay
Journal of Gazi Academic View , 2009,
Abstract: After the declaration of the Constitutional Monarchy in Ottoman Empire a great freedom atmosphere has been lived at the same time together with independently arming the Armenian committee members who had chance to turn back to home even they were guilty. With the influence of these events at the middle of April 1909 Muslim and Armenian were in conflict at Adana. These growing events separated from Adana to other Aleppo province. Many people murdered most of them lost their home and business places. Many people in Adana and Aleppo become in need of assistance.
The First Report of Amblyomma lepidum (Donitz, 1909) in IRAN
N Piazak
Iranian Journal of Public Health , 2005,
Abstract: Amblyomma lepidum (Donitz, 1909), collected on sheep from Gilan gharb, is reported for the first time from Iran. The species has been reported from Sudan, Ethiopia, Kenya, Egypt and Zanzibar as well. Male diagnosis: A small to medium – sized tick; scutum with characteristic ornamentations; postero- median stripe broad at the base, slightly knobbed at the anterior extremity, not reaching the falci- form stripe; postero- accessory stripes short, fairly close to the 3rd lateral spots, almost vertical; eyes small, dark coloured, hemispherical, orbited; festoons parti- coloured.
Redescription of Placobdella Multistriata ( Johansson, 1909) (Hirudinea: Glossiphoniidae)  [cached]
J. H Oosthuizen
Koedoe : African Protected Area Conservation and Science , 1979, DOI: 10.4102/koedoe.v22i1.651
Abstract: Study of a large number of specimens of Placobdella multistriata (Johansson, 1909) revealed the unsatisfactory nature of the information currently available on this leech. The reason is evidently the fact that previous workers had very limited and poorly prepared material at their disposal. In some instances, this even resulted in the description of non-existent species-taxa. In view of this unsound state of affairs, a redescription of P. multistriata is provided and evidence adduced for the amalgamation of Placobdella pulchra Moore, 1939, P. auroguttata Moore, 1939 and P. unita Moore, 1958 with P. multistriata.
The Prospective Cognition of Food Caching and Recovery by Western Scrub-Jays (Aphelocoma californica)
Nicola S. Clayton,Nathan J. Emery,Anthony Dickinson
Comparative Cognition & Behavior Reviews , 2006,
Abstract: The role of prospective cognition in food caching and recovery by western scrub-jays (Aphelocoma californica) is reviewed. These birds anticipate the short-term consequences of searching for cached food at recovery by reducing their searches for devalued food items. Two further lines of evidence suggest that the jays are also capable of more long-term prospection. First, the caching of food items decreases when they are consistently degraded or pilfered at recovery over cache-recovery intervals that preclude direct delayed reinforcement and punishment. Second, the jays anticipate the pilfering of their caches by another bird, which observes the caching episode, by engaging in various cache-protection behaviors. These finding suggest that the jays are capable of a form of prospective mental “time travel”.
Page 1 /100
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.