A5037484345- Amphibian and Reptile Biology
- Tardigrade Biology and Ecology
- Biocrusts and Microbial Ecology
- Wildlife Ecology and Conservation
- Sperm and Testicular Function
- Insect and Arachnid Ecology and Behavior
- Reproductive biology and impacts on aquatic species
- Bat Biology and Ecology Studies
- Animal Behavior and Reproduction
- Neurobiology and Insect Physiology Research
- Ichthyology and Marine Biology
- Erythrocyte Function and Pathophysiology
- Spaceflight effects on biology
- Cell Adhesion Molecules Research
- Marine animal studies overview
- Turtle Biology and Conservation
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Lepidoptera: Biology and Taxonomy
- Lichen and fungal ecology
- Fish Ecology and Management Studies
- Silk-based biomaterials and applications
- Botany and Plant Ecology Studies
- Hemoglobin structure and function
- Protist diversity and phylogeny
- Lipid Membrane Structure and Behavior
Heinrich Heine University Düsseldorf
2010-2022
University of Münster
1979-2009
Rijksmuseum
2007
Naturalis Biodiversity Center
2007
Hochschule Düsseldorf University of Applied Sciences
2006
Morpho (United States)
1993
Zoological Institute
1983
Kiel University
1975
When toads (Rhinella) are threatened they inflate their lungs and tilt the body towards predator, exposing parotoid macroglands. Venom discharge, however, needs a mechanical pressure onto parotoids exerted by bite of predator. The structure Rhinella jimi was described before after manual compression macroglands mimicking predator attack. Parotoids formed honeycomb-like collagenous alveoli. Each alveolus contains syncytial gland enveloped myoepithelium is provided with duct surrounded...
Abstract The skin of the aquatic pipid frog, Xenopus laevis , was examined for specific biomechanical features: (1) thickness, (2) maximal strain at break (ε f ), (3) tensile strength (σ m (4) modulus elasticity ( E stiffness), and (5) area under stress‐strain curve (W) (breaking energy, toughness). Skin freshly removed from dorsal, ventral, lateral areas body subjected to uniaxial tension. In both sexes, dorsal is thicker than ventral. male frogs consistently thinner in all regions that...
To extend data on 18S rDNA gene phylogeny within the Eutardigrada and to provide additional information unclear taxonomic status of a glacier tardigrade Hypsibius klebelsbergi, sequences from seven species family Hypsibiidae (Hypsibius cf. convergens 1, 2, scabropygus, Hebensuncus conjungens, Isohypsibius cambrensis, granulifer) were analysed together with previously published ten further eutardigrade or groups. Three distinctly separated clades Hypsibiidae, 1) Ramazzottius - Hebesuncus...
Urodeles include oviparous and a few obligately viviparous species that belong to one family, the Salamandridae. Oviducts of both groups have basically same design, but some modifications became necessary as evolved. The entire oviduct urodeles is lined by monolayered epithelium, which regionally differentiated into large glands smaller secretory cells rich in glycoproteins. Secretory products important for fertilization form egg jelly, also present species. In latter species, however, there...
Abstract The female genital structures of the entelegyne spider Latrodectus revivensis are described using semithin sections and scanning electron microscopy. Apart from tactile hairs overhanging opening atrium, contact zones epigynum devoid any sensilla, indicating that does not discriminate in favor or against males due to their size stimulation through copulatory courtship. dumb‐bell shape spatial separation entrance exit paired spermathecae suggest they functionally conduit type. Not for...
Abstract 1. Dentition and course of dental laminae in larval adult hynobiid salamanders are described using scanning light microscopy. 2. As other Urodela a developmental sequence can be observed from monocuspid undivided to divided teeth larvae bicuspid metamorphosed specimens. In some available both types monocuspids were present, their replacements being divided. 3. adults one continuous lamina accompanies the upper jaw. vomerine palatinal lamina, separated by distinct gap, accompany...
1. Dentition, tooth structure and course of dental laminae adult subadult Sirenidae (Siren intermedia, S. lacertina, Pseudobranchus striatus) have been studied by light microscopy scanning electron microscopy. 2. Splenials, vomers und palatines bear monocuspid unbladed teeth, arranged in a polystichous pattern, whereas praemaxillaries maxillaries (so far as present) are edentate. Teeth intermedia show rough basis, which is more prominent lacertina has break-throughs P. striatus. This zone...
Cadmium accumulation and its effect on gene expression have been investigated at sublethal cadmium concentrations in the soil oligochaete Enchytraeus buch- holzi.This worm is capable of accumulating to large amounts, which coincides with induction a mRNA isolated as cDNA clone by differential screening cDNAlibrary constructed from cadmium-treated enchytraeids.The cDNAclone designated CRPl 1474 base pairs length contains 753-base pair open reading frame, encoding novel Cys-rich...
Variation of abundance, dominance and diversity tardigrades were studied over a period 54 months in carpet the moss Rhytidiadelphus squarrosus that covered lawn Black Forest (Germany). Altogether 19,909 individuals belonging to 24 species extracted from moss. Macrobiotus hufelandi (56%), richtersi (18%) Diphascon pingue (12%) most abundant dominant species. Dominances other varied between 0.01 2.15%. Generally, (Shannon-Index evenness) was highest during winter. A temporal variation numbers...