ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    Electronic Resource
    Electronic Resource
    The impact of lead on the assimilation efficiency of laboratory-held Diplopoda (Arthropoda) preconditioned in different environmental situations (1992)
    Springer
    Oecologia 90 (1992), S. 113-119 
    Details
    ISSN: 1432-1939
    Keywords: Diplopoda ; Heavy metals ; Lead ; Assimilation efficiency ; Precondition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In five diplopod species from three families collected from locations with different soil metal contents, the following parameters were examined: the litter mass (and energy) ingested per day, the mass (and energy) assimilation rates, and the litter mass (and energy) assimilated per day, when the diplopods were fed (1) uncontaminated and (2) artificially lead-enriched leaf litter. These parameters were compared between species and between animals from different sites. The mass and energy assimilation efficiencies depend on (1) the size of the species and (2) the collection site of the animals. Relative mass (and in three of the species examined also energy) assimilation was highest in those animals collected from the less contaminated sites. With artificial diets, specimens from a site with soil contaminated by heavy metals showed greater assimilation of both mass and energy than originally unaffected specimens. One species (Glomeris conspersa) was able to compensate for the low assimilation rate by increased consumption, and thus guarantee a sufficient energy supply. One of the other species (Polydesmus denticulatus), however, did not show this compensation. Animals of this species from less contaminated sites showed a very low absolute energy assimilation rate and high mortality under lead treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317816
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Glycosaminoglycans and fibrillar collagen in priapulida: a histo- and cytochemical study (1992)
    Springer
    Histochemistry and cell biology 98 (1992), S. 389-397 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The distribution of glycosaminoglycans and fibrillar collagen was studied in various tissues of priapulids, which represent an ancient group of mFine metazoa. Sulphated glycosaminoglycans, as demonstrated at the electron microscopical level by Cupromeronic blue, were predominantly found in the cuticle, in basement membranes and also in the narrow connective tissue space below epidermis and anterior intestine. On the basis of their morphology the Cupromeronic blue precipitates could be divided into several groups. Fibrillar collagen occurred in the connective tissue under the epidermis and the epithelium of the anterior intestine. The spatial interrelationship between fibrillar collagen and glycosaminoglycans lacked with some exceptions, the high regularity found in connective tissues of other invertebrates and of vertebrates. This might be related to the special skeletal system of priapulids, consisting mainly of a strong extracellular cuticle and the turgor of the fluid-filled body cavity. In such a system the usual supportive structures seem to be of less functional significance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271075
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Microscopic anatomy, functional morphology, and ultrastructure of the stomach of Euphausia superba Dana (Crustacea, Euphausiacea) (1991)
    Springer
    Polar biology 11 (1991), S. 203-211 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Microscopic anatomy, functional morphology, and ultrastructure of the stomach of the antarctic krill Euphausia superba Dana were investigated by means of serial sections, scanning and transmission electron microscopy, and video technique. A separation of the stomach into an anterior part, called cardia, and a posterior part, called pylorus, became evident. Protrusions of the stomach into the midgut form the third region, called the funnel. The interior of the cardia is dominated by the two lateralia, originating from the side walls of the stomach. At their undersurface, they bear the primary filter. It separates the dorsal food channel from the ventral filtration channel, which is divided into two channels by a ventromedian ridge, the anteromedianum. Within the pylorus, the inferolateralia act in sealing the food channel from the filtration channel. In contrast to many other Malacostraca, the inferomedianum bears no secondary filter. During live observations, the stomach of Euphausia superba shows distinct pumping phases. A comparison of the structure of the stomach with data obtained from other Crustacea will lead to a better understanding about the relationships between the Malacostraca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00240209
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    Allozymes characterize sibling species of bipolar Priapulida (Priapulus, Priapulopsis) (1996)
    Springer
    Polar biology 16 (1996), S. 521-526 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Electrophoretic polymorphism of glucose-phosphate isomerase (Gpi * ) and phosphoglucomutase (Pgm * ) polymorphisms were assayed in the bipolar-disjunct species pairs Priapulus caudatus/P. tuberculatospinosus and Priapulopsis bicaudatus/Priapulopsis australis (phylum Priapulida). Numbers of genotypes from Gpi * alleles and 14 Pgm * alleles generally did not show deviations from Hardy-Weinberg expectations in composite populations sampled over geographic distances up to 500 km linearly measured. This genetic pattern suggests efficient population cohesion in a phylum where pelagic larvae have not been observed. Sibling species in genera Priapulus or Priapulopsis from northern and southern polar seas did not share identical allozyme alleles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050084
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Blood proteins in bipolar Priapulida (1992)
    Springer
    Polar biology 12 (1992), S. 667-672 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Molecular weights are provided for 44 blood serum proteins from four species of Priapulida: 21 peptides in Priapulus caudatus and P. tuberculatospinosus, 19 in Priapulopsis bicaudatus, and 24 in P. australis. One (exceptionally two) proteins predominate in the investigated sera. While electrophoretic patterns are variable within species, phenetic trees constructed on the basis of Czekanowski's distances of peptide pattern resemblance match the taxonomic hierarchy of priapulids. This shows that electrophoretic profiles of denatured serum peptides have a phylogenetic basis, in spite of considerable nongenetic diversity which limits phylogenetic interpretations of the present data set. One may tentatively conclude that molecular differentiation of bipolar priapulids is more extensive than morphological differences, at least in the genus Priapulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236990
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Allozymes characterize sibling species of bipolar Priapulida (Priapulus, Priapulopsis) (1996)
    Springer
    Polar biology 16 (1996), S. 521-526 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Electrophoretic polymorphism of glucosephosphate isomerase (Gpi*) and phosphoglucomutase (Pgm *) polymorphisms were assayed in the bipolardisjunct species pairsPriapulus caudatus/P. tuberculatospinosus andPriapulopsis bicaudatus/Priapulopsis australis (phylum Priapulida). Numbers of genotypes fromGpi * alleles and 14Pgm * alleles generally did not show deviations from Hardy-Weinberg expectations in composite populations sampled over geographic distances up to 500 km linearly measured. This genetic pattern suggests efficient population cohesion in a phylum where pelagic larvae have not been observed. Sibling species in generaPriapulus orPriapulopsis from northern and southern polar seas did not share identical allozyme alleles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02329072
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Microscopic anatomy and ultrastructure of the stomach of Porcellio scaber (Crustacea, Isopoda) (1987)
    Springer
    Zoomorphology 106 (1987), S. 301-311 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary From the micromorphological viewpoint, the stomach is by far the most complicated part of the digestive tract of Porcellio scaber. All parts are shown in electron micrographs. The simplest inner surface of the stomach is the dorsal part, which has an unpaired flap directed posteriorly (lamella dorsalis). The lateral walls carry the lateralia, superolateralia and lamellae annulares. The most complicated region of the stomach is the ventral surface with its anterior primary filter, the adjacent masticatory areas, the posterior secondary filter on the lateral sides of the inferomedianum and the inferolateralia. Ingested food can be filtered twice: first on the primary filter and then on the secondary filter. The digestive fluid secreted in the midgut glands can be conveyed on the same route as the filtrate of the gastric juice, but in the other direction. The posterior part of the stomach is wrapped by a ring-shaped fold of the anterior hindgut, thus making seven epithelia closely apposed to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312004
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Zur Ultrastruktur der Seitenorgane (Amphiden) des limnischen Nematoden Tobrilus aberrans (W. Schneider, 1925) (Nematoda, Enoplida) (1973)
    Springer
    Zoomorphology 74 (1973), S. 163-170 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zumammenfassung Die Seitenorgane (Amphiden) von Tobrilus aberrans stellen Einstülpungen der Epidermis dar, an die basal 16 Dendriten herantreten, die apikal je eine modifizierte Cilie tragen. Die Epidermiseinstülpung ist distal (im Bereich von Fovea und Canalis) cuticularisiert. Die Cuticula in diesem Bereich weist Bauunterschiede zu der der Körperoberfläche auf. Im Bereich des Fusus findet sick keine Cuticula. Die 16 Cilien der Dendriten treten über den Canalis in die Fovea ein und weisen auf verschiedener Entfernung von ihrer Insertion einen unterschiedlichen Querschnitt auf. Im Fusus sind sie nach dem 9×2+0-System aufgebaut, weiter distal verlieren sie die Ordnung ihrer Binnenstruktur und ihren kreisförmigen Querschnitt. Die Fovea wird vom Corpus gelatum ausgefüllt, das nicht aus der Apertura heraustritt.
    Notes: Summary The lateral organs (amphids) of Tobrilus aberrans, invaginations of the epidermis, are at their base in association with 16 dendrites, each of which has one modified cilium. The epidermal invagination is lined distally (in the region of fovea and canalis) by a cuticle, which differs in its ultrastructure from the cuticle covering the surface of the body. In the region of the fusus the cuticle is lacking. The 16 dendritec cilia enter the fovea via the canalis and exhibit differing cross-sections if cut at various distances from their origin. In the fusus they are constructed according to a 9 × 2 + 0 pattern; this order is lost as they approach the canalis, in the fovea they additionally loose the circular outline of their cross-section. The fovea is filled by the corpus gelatum which does not extend beyond the apertura.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280785
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Über die Feinstruktur der Polychaeten-Epidermis (Annelida) (1970)
    Springer
    Zoomorphology 66 (1970), S. 310-322 
    Details
    ISSN: 1432-234X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Comparative finestructural studies on the integument of 18 polychaetes belonging to 14 families were conducted. Main differences are to be found in the organisation of the cytoplasm (homogenous or vacuolated) and the occurrence of layers of fibers between the apical microvilli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305705
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Impact of heavy metals on mass and energy flux within the decomposition process in deciduous forests (1995)
    Springer
    Ecotoxicology 4 (1995), S. 114-137 
    Details
    ISSN: 1573-3017
    Keywords: heavy metal ; lead ; decomposition ; leaf litter accumulation ; diplopods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Laboratory experiments on microbial decomposition and on the contribution of diplopods to organic matter decomposition in soil were combined with field studies to reveal the major points of heavy metal effects on the leaf litter decomposition process. The study focused on the accumulation of organic litter material in heavy metal-contaminated soils. Microbial decomposition of freshly fallen leaves remained quantitatively unaffected by artificial lead contamination (1000 mg kg-1). The same was true for further decomposed leaf litter material, provided that the breakdown of this material was not influenced by faunal components. Although nutrient absorption in diplopods is affected by high lead contents in the food, this effect alone, however, was shown not to be sufficient for the massive deceleration of the decomposition process under heavy metal influence which could not only be observed in the field but occurred in microcosm studies as well. Reduced reproduction and lower activity of the diplopods most likely were responsible for the observation that lead-influenced diplopods enhanced microbial activity in soil only in a lesser degree than uncontaminated animals did. This effect is assigned to represent the main reason for decreased decomposition rates and the subsequent accumulation of organic material in heavy metal-contaminated soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00122172
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...