ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Electronic Resource

On the communication systems of the antsPseudomyrmex termitarius andP. triplarinus (1986)

Jaffé, K. ; Lopez, M. E. ; Aragort, W.

Springer

Insectes sociaux 33 (1986), S. 105-117

add to mindlist on the mindlist

Details

ISSN: 1420-9098

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Description / Table of Contents: Zusammenfassung Die zwei untersuchtenPseudomyrmex-Arten haben die folgenden Kommunikationssysteme: a) P. triplarinus informiert ihre Nestgenossinnen über das Vorhandensein von Futter, aber nicht über dessen Lage.P. termitarius hat keinerlei Kommunikation bei der Futtersuche. b) Beide Arten erkennen ihr Territorium anhand von Duftstoffen.P. triplarinus markiert ihr Territorium mit einem Pheromon aus dem Thorax, wahrscheinlich von der Metathorakaldrüse. Die territoriale Markierung hat eine Lebensdauer von einer halben bis einer Stunde. Sie dient wahrscheinlich der Verteidigung des Territoriums. Die Markierung vonP. termitarius hält über 5 Stunden an und wirkt wahrscheinlich als Nesteingangs-Orientierungsmarke. Die Herkunft des Duftstoffes ist nicht klar. c) P. triplarinus benützt ein Pheromon aus dem Kopf als Signal für das Erkennen ihrer Schwestern.P. termitarius verwendet nicht-identifizierte Duftstoffe, die überall im Körper vorhanden sind, als Identifikationssignal. d) Beide Arten haben Alarmpheromone im Kopf und im Abdomen. Die Kommunikationssysteme werden im Zusammenhang mit der oekologischen Adaption der Arten analysiert.

Notes: Summary The twoPseudomyrmex species studied have the following communication systems: a) P. triplarinus informs its nestmates about the presence of food, but not about its location.P. termitarius does neither. b) Both species recognize their territory and/or area around the nest entrance through odours on the substrate.P. triplarinus marks its territory with a pheromone from the thorax, probably from the metapleural gland. This territorial mark lasts less than 1 h, and probably advertises at least part of the home range of the colony. The territorial odour used byP. termitarius, probably works as a nest entrance orientation mark, and lasts over 5 h, but less than 24 h. The origin of the odour is not clear. c) P. triplarinus uses a cephalic pheromone as the main signal for nestmate recognition.P. termitarius uses non-identified odours, present on all body parts of the insect, as a nestmate recognition signal. d) Both species produce alarm pheromones from the head and the gaster. The communication systems are interpreted in relation to the ecological adaptations of each species.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02224591

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Telomeric fusion in pre-T-cell acute lymphoblastic leukemia (1986)

Morgan, R. ; Jarzabek, V. ; Jaffe, J. P. ; [et al.]

Springer

Human genetics 〈Berlin〉 73 (1986), S. 260-263

add to mindlist on the mindlist

Details

ISSN: 1432-1203

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Medicine

Notes: Summary Telomeric fusion, a rare phenomenon, was observed in malignant cells from the peripheral blood of an 18-year-old male with rapidly progressive pre-T-cell acute lymphoblastic leukemia (ALL). Only two comparable cases, both with B-cell ALL, have been reported with telomeric fusion in neoplasia. All of the leukemic cells examined from our patient had two chromosome abnormalities consisting of partial triplication (trp) of chromosome 2 and a derivative chromosome 3. Approximately a third of the leukemic cells showed in addition telomere-telomere fusions. These involved the telomeric regions of 1p, 2p, 4q, 5q, 7q, 10q, 11q, 12p, 15p, 21p, and Xq and 3p of the derivative (3). The findings in this case suggest that telomeric fusion may function as a mechanism for the development of chromosome rearrangements that may play a role, albeit rarely, in human neoplasia.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00401240

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

The structure of thermotropic copolyesters (1986)

Sawyer, Linda C. ; Jaffe, Michael

Springer

Journal of materials science 21 (1986), S. 1897-1913

add to mindlist on the mindlist

Details

ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Highly oriented polymeric products have been produced over the past fifteen years by two very different processing routes; from conventional polymers processed to highly oriented extended chain structures, and from “rod-like” polymers which exhibit liquid crystalline behaviour. Gel spun polyethylene is an example of such a conventional polymer. There are three main types of liquid crystalline polymers (LCP) which have high orientation and modulus: lyotropic aramids, such as poly(ρ-phenylene terephthalamide) (PPTA); lyotropic, aromatic heterocyclic polymers, or “ordered polymers”; and the family of thermotropic aromatic copolyesters. Extensive characterization of the thermotropic copolyesters has resulted in the delineation of a fibrillar, hierarchial structural model which accounts for the structures observed in a broad range of oriented fibres, extrudates and moulded articles. Three distinct fibrillar species are observed: microfibrils that are about 50 nm, fibrils about 500 nm, and macrofibrils about 5μm, in size. Superimposed on the structural hierarchy is a defect hierarchy, defined by the regular meander of the molecular chain and a localization of defects within a microfibril at about a 50 nm periodicity. Orientational variations, layering and skin core structures, in thick specimens, are the result of local flow fields on the basic structural units during solidification. The fibrillar textures appear to be present prior to any preparation for microscopy. A wide range of specimen preparation methods, i.e. fractography, sonication, microtomy and etching, and microscopic techniques, i.e. optical, scanning and transmission electron microscopy, were applied to the characterization of the aromatic copolyesters and PPTA. Interestingly, the same basic hierarchy is observed for both the lyotropic and the thermotropic LCPs and the microfibrillar structures of all the highly oriented polymers, including polyethylene, appear quite similar.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00547924

Permalink