Now showing items 1-10 of 18987
Food web structure in a tropical stream ecosystem
(Blackwell Publishing Asia, 2005-02-01)
This study investigated the structure and properties of a tropical stream food web in a small spatial scale, characterizing its planktonic, epiphytic and benthic compartments. The study was carried out in the Potreirinho ...
Conversion of web texts into Braille characters for real time reading through arrays of electromechanical actuators
(IOS Press, 2010-01-01)
This paper describes an electronic device conceived to convert common web texts into sequences of corresponding Braille signals, which are immediately reproduced onto an array ( keyboard) of electromechanical actuators. ...
Interference competition and scavenging by Crematogaster ants (Hymenoptera: Formicidae) associated with the webs of the social spider Anelosimus eximius (Araneae: Theridiidae) in the central Amazon
Crematogaster cf. victima is a common inhabitant in the sheet web nests of the social spider Anelosimus eximius in the central Amazon basin near Manaus. A number of other ant species were found foraging on the non-sticky ...
Direito autoral e tecnologias de informação e comunicação no contexto da produção, uso e disseminação de informação: um olhar para as Licenças Creative Commons
(Universidade Federal da Paraíba (UFPB), 2009-01-01)
The development of information and communication technologies, in particular, Internet, and its Web 2.0 information environment has led to significant changes in contemporary society as to the ways of producing informational ...
A natural combinatorial chemistry strategy in acylpolyamine toxins from Nephilinae orb-web spiders
(Taylor & Francis Inc, 2005-01-01)
The present study shows how nature combined a small number of chemical building blocks to synthesize the acylpolyamine toxins in the venoms of Nephilinae orb-web spiders. Considering these structures in four parts, it was ...
Can seasonal differences influence food web structure on preserved habitats? Responses from two Brazilian streams
(Akademiai Kiado, 2012-12-01)
Many studies on Neotropical streams have reported seasonal in the diet of fish, although studies that evaluate the influence of these temporal difference on the entire web are very scarce. under the hypothesis that trophic ...
Structure determination of a tetrahydro-beta-carboline of arthropod origin: A novel alkaloid-toxin subclass from the web of spider Nephila clavipes
(Verlag Helvetica Chimica Acta Ag, 2005-01-01)
The orb-web spiders are polyphagous animals in which the web plays a very important role in the capture of preys; oily droplets usually cover the capture-web of the spider Nephila clavipes and seem to be of great importance ...
The venomous secrets of the web droplets from the viscid spiral of the orb-weaver spider Nephila clavipes (Araneae, Tetragnatidae)
The capture web of N. clavipes presents viscous droplets, which play important roles in web mechanics and prey capture. By using scanning and transmission electron microscopy, it was demonstrated that the web droplets are ...
The dimensionality of ecological networks
How many dimensions (trait-axes) are required to predict whether two species interact? This unanswered question originated with the idea of ecological niches, and yet bears relevance today for understanding what determines ...
COOPERATIVE PREY CAPTURE BY AN ORB-WEB SPIDER