ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Springer  (48.555)
  • Oxford University Press  (3.744)
  • 1980-1984  (48.027)
  • 1925-1929  (4.272)
  • 1982  (48.027)
  • 1925  (4.272)
Sammlung
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1980-1984  (48.027)
  • 1925-1929  (4.272)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Functional morphology of locomotion in Derocheilocaris typica (Crustacea, Mystacocarida) (1982)
    Springer
    Zoomorphology 100 (1982), S. 1-10 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The crustacean class Mystacocarida is restricted to the interstitial marine sand environment. A cinemicrographic analysis of the functional morphology of locomotion in the mystacocarid D. typica was undertaken to demonstrate how this species progresses through the interstitial spaces. Locomotion is completely dependent on the presence of dorsal and ventral substrates. The biramous second antennae and mandibles are the force-generating appendages. During a locomotory cycle, the exopods of the second antennae and mandibles are directed dorsolaterally against a dorsal substrate. This creates a downward force enabling the endopods to gain purchase on the ventral substrate. The second antennae and mandibles undergo coordinated cyclic movements. Each cycle results in two power and two recovery strokes. The animals undergo approximately 4 complete cycles per second. The calculated maximum rate of locomotion is 420 μm/s. The measured rate under test conditions is 250 μm/s. A turning-escape reaction in response to air bubbles and other factors results in a 180° turn in a confined space within 1.5 s. These data are discussed in relation to the morphological conservatism of mystacocarids, their presumed neotenic origin and their observed migration over a tidal cycle. It is proposed that all crawling interstitial animals will have developed specific mechanisms to increase frictional forces between their locomotory appendages and the surrounding substrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312196
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Fine structure of the ocellus of Sarsia tubulosa (Hydrozoa, Anthomedusae) (1982)
    Springer
    Zoomorphology 100 (1982), S. 11-22 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The fine structure of the ocellus of Sarsia tubulosa is described. The ocellar cup is formed of pigment cells and receptor cells. The receptor cells outnumber the pigment cells in almost a 2:1 ratio. Lateral extensions of neighbouring pigment cells enclose a distal region of 2 to 10 receptor cells. The receptor cell body is 5–7 μm in diameter with an apical extension (20–60 μm long) that reaches the ocellar cavity. A cilium (9+2 microtubules) arises from the distal part of the receptor cell. The ciliary membrane forms lateral microvilli. The tips of a number of cilia are swollen into large vesicles forming a “cornea”. The central region of the ocellar cavity contains extracellular electron dense homogeneous material surrounded by swollen ciliary tips and small vesicles. The close apposition between the plasma membrane covering the distal part of adjacent receptor cells as well as the adjacent ciliary shafts suggests the presence of gap junctions. The basal part of each receptor cell forms an axon. The axons of receptor cells form 3 to 4 nerve bundles that join to form the optic nerve. Synapses occur between receptor cell bodies, between axons and receptor cell bodies and among axons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312197
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    The anal glands of Rhapidostreptus virgator (Diplopoda: Spirostreptidae) (1982)
    Springer
    Zoomorphology 100 (1982), S. 65-73 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In Rhapidostreptus virgator exocrine gland complexes are found in the anal valves of both sexes. Every gland complex consists of about 200 secretory units, each of which is comprised of four cells: two secretory cells, an intermediary cell, and a canal cell. The amount of secretion produced by these glands varies during the intermoult cycle: it is very small in freshly moulted individuals (postmoult phase), at a medial level during the following intermoult phase, and very large in the premoult phase. The secretion may be used to form the excrement clumps and above all to build the moulting chamber.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312200
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    The morphology of amphibian skin vascularization before and after metamorphosis (1982)
    Springer
    Zoomorphology 100 (1982), S. 55-63 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The skin vascularization was investigated troughout the ontogenetic development and in adults of two anurans, Rana temporaria and Bufo bufo, and two urodeles, Triturus vulgaris and Triturus cristatus. It was found that, contrary to the urodele larvae, the anuran tadpoles have a very sparse skin vascularization. During the early stages of anuran metamorphosis the skin capillary network becomes dense; later, during skin metamorphosis, a second, venous, network is formed as anastomoses between the subcutaneous vein ramifications. In the urodeles, metamorphosis is not accompanied by any significant morphological changes in the skin vascularization, and a subcutaneous network is not formed. It is suggested that the reduced skin vascularization in anuran tadpoles is an advanced larval character relative to the rich vascularization of the skin in urodele larvae. It is further suggested that anuran tadpoles have a reduced ability to utilize gaseous exchange through the skin. The function of the subcutaneous venous network found in anurans after metamorphosis is obscure; experiments indicate a vasomotor regulation which is neither adrenergic nor cholinergic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312199
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    The larval morphology of the marine bryozoan Bowerbankia gracilis (Ctenostomata: Vesicularioidea) (1982)
    Springer
    Zoomorphology 100 (1982), S. 23-54 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The larval morphology of the marine bryozoan Bowerbankia gracilis has been investigated by light and electron microscopy. The barrel-shaped larva (200 μm long and 150 μm in diameter) is light yellow without any apparent eyespots, although it is positively phototactic during its brief free-swimming existence. The primary morphological characteristics of the larva are: (1) a large corona that forms most of the larval surface, (2) a small apical disc without blastemas, (3) a deep pallial sinus lined by an extensive pallial epithelium, (4) an internal sac without regional specializations, and (5) a polypide rudiment in the oral hemisphere. This organization is characteristic of larvae of the ctenostome superfamily Vesicularioidea, and differs radically from the organization of all other bryozoan larvae examined. The major morphological differences occur in the size and organization of the apical disc, the pallial epithelium, and the internal sac. In most bryozoans, these regions of the larval epithelium represent rudiments of the polypide and the body wall epidermis of the ancestrula. The oral polypide rudiment, the extensive pallial epithelium, and the reduced internal sac in vesicularioid larvae indicate that their pattern of metamorphosis also differs radically from the metamorphoses of other bryozoans.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312198
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Bau und Funktion des Süßwasserschwamms Ephydatia fluviatilis L. (Porifera) (1982)
    Springer
    Zoomorphology 100 (1982), S. 75-87 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Ein in Styrolmethacrylat eingebetteter Schwamm (Ephydatia fluviatilis L.) wurde mit der Laubsäge in Stücke zerlegt. Ein Teilstück wurde dann in Xylol vom Polymerisat befreit, im Critical Point Dryer getrocknet, mit Gold bedampft und schließlich rasterelektronenmikroskopisch betrachtet. Die erzielten Aufnahmen stellen das Zellengefüge des Schwammes von der Schnittfläche ausgehend dreidimensional dar.
    Notizen: Summary A sponge (Ephydatia fluviatilis L.) embedded in styrol methacrylate was cut into pieces with a fretsaw. One piece was then soaked in xylene to remove the polymer, dried in the critical-point dryer, gold-coated and finally examined in the scanning electron microscope. The pictures obtained reveal the three dimensional arrangement of the cells in the sponge, through the openings in the cut surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310355
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Fine structure of the female genital apparatus of Philodina (Rotifera, Bdelloidea) (1982)
    Springer
    Zoomorphology 100 (1982), S. 89-105 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The organization of the female genital apparatus of the bdelloid rotifer Philodina roseola was analyzed by light and electron microscopy. It differs from that of the monogononts in several respects: the gonad is paired; in each gonad, the follicular layer completely surrounds the syncytial vitellarium and the cluster of ovocytes; the cytoplasmic bridges between the vitellarium and the immature ovocytes exist but are much narrower; a specialized junction (5–8 nm intercellular space) is established between the follicular layer and the whole area of the germo-vitellarium complex. Preliminary observations about the movements of organelles during ovogenesis were made at an ultrastructural level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310356
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Ultrastructure of the tentacles of Themiste lageniformis (Sipuncula) (1982)
    Springer
    Zoomorphology 100 (1982), S. 143-156 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary An ultrastructural study of the tentacles of Themiste lageniformis (Sipuncula) was conducted as part of a larger study of head metamorphosis in the species. The oral surface of the tentacles is constructed of a multiciliated, pseudostratified, columnar epithelium while the aboral surface is an unciliated, cuboidal epithelium. Intraepidermal mucous cells lie near the junction of the oral and aboral regions. The basal portion of the epidermal cells is embedded in a thick, collagenous extracellular matrix which contains outer circular muscles, inner longitudinal muscles, the main tentacular nerve and its branches. Three tentacular canals are present and are lined by peritoneum. Hemerythrocytes and coelomocytes flow through the lumen of the canals in a regular pattern. Justification for the designation of the tentacular canals as coelomic rather than vascular is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310360
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Coxal organs in geophilomorpha (Chilopoda). Organization and fine structure of the transporting epithelium (1982)
    Springer
    Zoomorphology 100 (1982), S. 107-120 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The coxal organs of different Geophilomorpha were studied by scanning and by transmission electron microscopy. 1) The coxae of the last trunk-segment contain pores in different arrangements and numbers. They are the openings of the coxal organs. 2) The coxal organs are formed by four different cell types: the main epithelium consists of radially arranged transporting cells, surrounded by junctional cells, gland cells, and the cells of the pore channel. 3) The cells of the transporting epithelium show an enlargement of the apical and basal surface. Deep and narrow extracellular channels of the apical infoldings are closely associated by mitochondria (plasmalemma-mitochondrial complexes). The epithelium is covered by a prominent cuticle with a spacious subcuticle. 4) A distinct mucous layer covers the cuticle of the transporting epithelia, and is secreted by the gland cells. 5) A small cellular sheath separates the epithelium of the coxal organ against the haemolymph. 6) The possible function of the coxal organs in ion and fluid transport is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310357
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    The ultrastructure of the sense organs of some turbellaria rhabdocoela. I. The eyes of Polycystis naegelii Kölliker (Eukalyptorhynchia Polycystididae) (1982)
    Springer
    Zoomorphology 101 (1982), S. 95-102 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Each pigment-cup eye of Polycystis naegelii consists of two retinal clubs and a single pigmented cell. The latter is divided into two cavities by a septum. Under bright illumination the photoreceptor process appears as a disk containing membranous laminar whorls; under faint illumination the latter are replaced by numerous straight, closely packed, microvilli. This morphological variation is correlated with the intensity of the photoreceptor's exposure to light. The lenticular structures described by previous light microscopists have not been observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312017
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 11
    Digitale Medien
    Digitale Medien
    The surface microstructure of marine and terrestrial isopoda (Crustacea, Peracarida) (1982)
    Springer
    Zoomorphology 101 (1982), S. 151-164 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The microstructure of the surface of thirteen marine littoral and two terrestrial isopods was investigated by scanning electron microscopy. A great diversity of surface ornamentation is present, including non-sensory microscales, pits, tubercles, and ridges, and sensory tricorns, pit organs, pores, papillae and setae. Microscales are common features of the integument surface; their shape and size are highly variable. Tricorns were not observed on the marine littoral isopods. Several hitherto undescribed structures were observed including spade-like projections from the tergite surface of Oniscus asellus, hair-like filaments associated with the microscales of Jaera and ridged conical protuberances on Edotea triloba and E. montosa. The possible function of certain surface microstructures is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312430
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 12
    Digitale Medien
    Digitale Medien
    Ultrastruktur potentiell photoreceptorischer Zellen unterschiedlicher Organisation bei einem Proseriat (Plathelminthes) (1982)
    Springer
    Zoomorphology 101 (1982), S. 165-175 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Zwei links und rechts im Vorderkörper von Cirrifera aculeata (Ax, 1951) (Proseriata) gelegene Zellen werden als mögliche Photoreceptoren angesprochen. In ein großes intracelluläres Lumen der linken Zelle ragen über 70 nur leicht modifizierte Cilien, daneben treten Mikrovilli und elektronendichte Granula auf. Die vermutlich lichtsensitiven Strukturen der rechten Zelle bilden dicht nebeneinander liegende röhrenartige Vakuolen, vergleichbar den Mikrovilli eines Rhabdoms. Die funktionellen und evolutiven Aspekte dieser beiden bisher unbekannten Zelltypen werden diskutiert.
    Notizen: Summary Two cells which lie at the left and at the right near the anterior end of Cirrifera aculeata (Ax, 1951) (Proseriata) are interpreted as presumed photoreceptors. In the left cell up to 70 slightly modified cilia extend into a large intracellular cavity. Besides these cilia microvilli and electron-dense granules are present. The presumed light sensitive structures of the right cell are formed by tubular vacuoles which are arranged without gaps, thus comparable to the microvilli of a rhabdom. The functional and evolutionary aspects of these two cell types are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312431
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 13
    Digitale Medien
    Digitale Medien
    The settlement and metamorphosis of the marine bryozoan Bowerbankia gracilis (Ctenostomata: Vesicularioidea) (1982)
    Springer
    Zoomorphology 101 (1982), S. 103-132 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The settlement and metamorphosis of the marine bryozoan Bowerbankia gracilis has been examined by light and electron microscopy. The period of rapid morphogenesis consists of the following sequence of morphogenetic movements: 1) eversion of the internal sac, 2) retraction of the apical disc, 3) coronal involution and exposure of the pallial epithelium, and 4) closure of the internal coronal cavity. The eversion of the internal sac at the onset of metamorphosis coincides with a sudden reversal of the direction of beat of the coronal cilia. The reversed beating of the coronal cilia wafts the adhesive secreted by the internal sac over the metamorphosing larva, forming the pellicle. The internal sac is subsequently internalized and histolyzed with the corona and the other transitory larval tissues, and the extensive pallial epithelium forms the epidermis of the ancestrular body wall (cystid). Type I mesenchyme cells form an incomplete somatic mesothelium beneath the differentiating cystid epidermis, and Type II mesenchyme cells become mobile phagocytes. The main body cavity develops by the histolytic enlargement of the internal cavity formed during coronal involution. The apical disc degenerates and the polypide develops from rudiments in the oral hemisphere of the larva. The distinctive larval morphology and metamorphosis of vesicularioid ctenostomes are compared with other bryozoans, and possible evolutionary trends are considered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312018
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 14
    Digitale Medien
    Digitale Medien
    The fine structure of the buccal tentacles of Holothuria forskali (Echinodermata, Holothuroidea) (1982)
    Springer
    Zoomorphology 101 (1982), S. 133-149 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Ultrastructural study of the buccal tentacles of Holothuria forskali revealed that each tentacle bears numerous apical papillae. Each papilla consists of several differentiated sensory buds. The epidermis of the buds is composed of three cell types, i.e. mucus cells, ciliated cells, and glandular vesicular cells (GV cells). The GV cells have apical microvilli; they contain bundles of cross striated fibrillae associated with microtubules. Ciliated cells have a short non-motile cilium. Bud epidermal cells intimately contact an epineural nervous plate which is located slightly above the basement membrane of the epidermis. The epineural plate of each bud connects with the hyponeural nerve plexus of the tentacle. This nerve plexus consists of an axonic meshwork surrounded in places by sheath cells. The buccal tentacles have well-developed mesothelial muscles. Direct innervation of these muscles by the hyponeural nerve plexus was not seen. It is suggested that the buccal tentacles of H. forskali are sensory organs. They would recognize the organically richest areas of the sediment surface through the chemosensitive abilities of their apical buds. Tentacles presumably trap particles by wedging them between their buds and papillae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312019
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 15
    Digitale Medien
    Digitale Medien
    Fine structure of a mandibular stretch receptor in Thrips physapus L. (Thysanoptera, Insecta) (1982)
    Springer
    Zoomorphology 101 (1982), S. 177-186 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Only one non-ciliary proprioceptor is developed on the mandible of Thrips. It consists of two bipolar, multiterminal sense cells, the dendrites of which form a strand extended between the tentorium and the back mandibular margin. The dendritic terminals are embedded in an electron-dense, homogeneous matrix, which obviously represents the stimulus transmitting structure. The strand is stretched, if the mandible is moved forwards and upwards. In Thrips, the system of proprioceptors monitoring the mandibular movement is reduced extensively compared with other pterygote insects. This is linked up with the far-reaching reduction of the mobility of the mandible itself.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312432
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 16
    Digitale Medien
    Digitale Medien
    Structure of the nephridium in Ophryotrocha puerilis (Polychaeta, Dorvilleidae) (1982)
    Springer
    Zoomorphology 101 (1982), S. 187-195 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The nephridia of Ophryotrocha puerilis are segmental organs. The nephrostome opens at the posterior margin of a setigerous segment into the coelomic cavity of this segment. The nephridial canal is made up of about 15 cells. These cells form an S-shaped tubule which extends into the following segment. The lumen of the nephridial canal ranges from 2 to 7 μm in diameter. The nephropore opens laterally on the ventral surface of the body wall. In cross sections, one, two, or three cells are seen forming the canal. The inner surfaces of the canal cells are of different appearances along the canal. Since no regular pattern of cell distribution was found along the canals of different nephridia it is assumed that changes in cell structure along the canal are due to functional states or properties rather than to anatomically fixed regional differences. The canal cells either show smooth contours or they form brush borders of microvilli or sponge-like inner surfaces with a system of vacuolar canals running through the cytoplasm. Most of the canal cells are filled with various kinds of vesicles. Usually two or three cells contain larger vesicles up to 2.5 μm in diameter with more or less electron-dense contents. Some of these vesicles resemble lysosomes. There are at least three bundles of cilia in each canal. In young specimens the number of cilia in one bundle is smaller (10–15) than in adult specimens (60–70). The nephridia do not show sex specific differences. The female nephridia do not function as genital ducts. As judged from the sizes of sperm and nephridia it appears to be possible that sperm are shed via male nephridia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312433
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 17
    Digitale Medien
    Digitale Medien
    Ultrastructure of spermiogenesis of Philippia (Psilaxis) oxytropis, with special reference to the taxonomic position of the architectonicidae (Gastropoda) (1982)
    Springer
    Zoomorphology 101 (1982), S. 197-214 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Spermiogenesis of the architectonicid Philippia (Psilaxis) oxytropis was studied using transmission electron microscopy. Both spermatids and mature sperm of Philippia show features comparable to sperm/spermatids of euthyneuran gastropods (opisthobranchs, pulmonates) and not mesogastropods (with which the Architectonicidae are commonly grouped). These features include: (1) Accumulation of dense material on the outer membrane of anterior of the early spermatid nucleus — this material probably incorporated into the acrosome; (2) Structure of the unattached and attached spermatid acrosome (apical vesicle, acrosomal pedestal) accompanied by curved (transient) support structures; (3) Formation of the midpiece by individual mitochondrial wrapping around the axonemal complex, and the subsequent fusion and metamorphosis of the mitochondria to form the midpiece; (4) Presence of periodically banded coarse fibres surrounding the axonemal doublets and intra-axonemal rows of granules. A glycogen piece occurs posterior to the midpiece but is a feature observed in both euspermatozoa of mesogastropods (and neogastropods) and in sperm of some euthyneurans. Despite the lack of paracrystalline material or glycogen helices within the midpiece (both usually associated with sperm of euthyneurans), the features of spermiogenesis and sperm listed indicate that the Architectonicidae may be more appropriately referable to the Euthyneura than the Prosobranchia.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312434
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 18
    Digitale Medien
    Digitale Medien
    Ultrastructure of the pleopods of the estuarine isopod Cyathura carinata (Crustacea: Isopoda: Anthuridea) (1982)
    Springer
    Zoomorphology 101 (1982), S. 215-226 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The exopodal branches of the pleopods of Cyathura carinata have a thicker cuticle than the endopodites, but the hypodermis proved to be very thin and probably of respiratory function. The nuclei are found in ‘pilaster areas’ together with stabilizing elements (micro-tubuli attached to cuticular pegs), which are typical for hypodermal ‘tendon cells’ of other arthropods. Precipitation of Ag2S revealed that the cuticle of the exopod is more permeable to silver ions than the cuticle of the endopods. The endopodal epithelia have the features of typical osmoregulating tissues (apical folds, mitochondrial pumps, and basal invaginations of the plasma membrane) and reduce silver nitrate. The stabilizing ‘pilaster areas’ are composed of the same elements as in the exopods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312435
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 19
    Digitale Medien
    Digitale Medien
    Zur entomostraken-fauna des seeburger sees (1925)
    Springer
    Zoomorphology 4 (1925), S. 1-87 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407626
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 20
    Digitale Medien
    Digitale Medien
    Untersuchungen zur ökologie und morphologie einiger landasseln (1925)
    Springer
    Zoomorphology 4 (1925), S. 337-415 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408462
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 21
    Digitale Medien
    Digitale Medien
    Über zwei grundtypen der flügel bei den insecten und ihre evolution (1925)
    Springer
    Zoomorphology 4 (1925), S. 465-501 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408465
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 22
    Digitale Medien
    Digitale Medien
    Biologische reisestudien in Südamerika. III. Chilenische beutelratten (1925)
    Springer
    Zoomorphology 3 (1925), S. 169-176 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407620
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 23
    Digitale Medien
    Digitale Medien
    Die molluskenfauna der sperenberger salzgewässer (1925)
    Springer
    Zoomorphology 3 (1925), S. 81-149 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. Die Sperenberger Salzgewasser sind, soweit sie höheren Salzgehalt haben (Krummer See 1,45%, Schneidegraben 1,45% bis etwa 1%), molluskenlos, soweit sie niedrigeren Salzgehalt besitzen (Mellensee und Nottekanal 0,3–0,4%), enthalten sie eine artenarme Molluskenfauna, von der einzelne Arten Merkmale einer Verkümmerung zeigen. Echte Brackwasserarten fehlen. 2. Die Brackwasserfauna der Sperenberger und der übrigen zum Vergleich herangezogenen Gewässer setzt sick vorwiegend, soweit sie aus Gastropoden besteht, aus Pulmonaten zusammen, die also mehr euryhalin zu sein scheinen als die Prosobranchier; am meisten gilt das von den Limnäen. 3. Die faunistischen Befunde und die Experimente zeigen, daß ein erheblicher Teil unserer Süßwassermollusken in brackigen Gewässern leben kann. Zum Schluß meiner Arbeit möchte ich allen Herren, die mich bei der Abfassung derselben unterstützt haben, meinen aufrichtigen Dank aussprechen. Zunächst Herrn Professor Dr. DEEGENER für die Annahme meines Themas und häufig erteilte Ratschläge, ferner Herrn StudienratRoyer für seine Mitteilungen von Funden aus dem Märkischen Museum, Herrn Bergrat Dr.Schmierer für die Liebenswürdigkeit, mit der er mir die Einsichtnahme in die Akten der Geologischen Landesanstalt gestattete, Herrn cand. med.Sachs für vorübergehende Pflege meiner Versuchsbecken, Herrn Dr.Luther, Pässler, Schermer, Steusloff undGassert für Überlassung von Material, HerrnHummel für gelegentliche Teilnahme und Hilfe bei meinen Exkursionen, Herrn stud. phil. Roch für Literaturangaben.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407618
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 24
    Digitale Medien
    Digitale Medien
    Mysis relicta (1925)
    Springer
    Zoomorphology 3 (1925), S. 389-440 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408149
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 25
    Digitale Medien
    Digitale Medien
    Das leben der gastameise (Formicoxenus nitidulus Nyl.) in neuer beleuchtung (1925)
    Springer
    Zoomorphology 3 (1925), S. 452-476 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408151
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 26
    Digitale Medien
    Digitale Medien
    Zur theorie der staatenbildung. I. Teil: Die biologie der furchenbiene halictus malachurus K. (1925)
    Springer
    Zoomorphology 3 (1925), S. 619-684 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00443876
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 27
    Digitale Medien
    Digitale Medien
    Beitrag zur topographischen anatomie der eingeweide des Huhnes (1925)
    Springer
    Zoomorphology 3 (1925), S. 785-793 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00443880
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 28
    Digitale Medien
    Digitale Medien
    Der einfluss der nähreier auf die larvenentwicklung von buccinum und purpura (1925)
    Springer
    Zoomorphology 3 (1925), S. 526-541 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. In den Eikapseln von Bucinum und Purpura werden von zahlreichen Eiern stets nur wenige zu Embryonen. Die Ursache dieses Entwickluingsunterschiedes der Eier ist bis heute unbekannt; aus der Tatsache des Spermiendimorphismus der Prosobranchier ergibt sich vorderhand keine allgemeingültige Erklärung. 2. Die Eier, die sich niche entwiekeln, bleiben bei Buccinum völlig intakt; bei Purpura zerfallen sie zu kleinen Klümpchen von Dotterkugeln. Sie dienen den Embryonen in beiden Fällen zur Nahrung, werden aber niche allmählich aufgenommen und verdant, sondern in großen Mengen aufgeschluckt und im Mitteldarm gespeichert. Dieser schwillt stark an und wird zu einer Art Dottersack. 3. Bei Buccinum geht die Entwicklung der Larven auch während der Eiaufnahme weiter, bei Purpura dagegen stett die Organbildung Solange fast völlig still, bis die Veliger einer Kapsel sämtliche Nähreier aufgenommen haben. 4. Die Anhäufung der Dottermasse im Mitteldarm bewirkt Hemmungen in der Ausbildung mancher Organe. So bleiben Herz und Niere in der Entwicklung zurück und werden durch Larvenorgane lange Zeit ersetzt. Besonders lange wird die Gliederung des dottergefüllten Mitteldarmes in Magen und Leber verzögert. Die Leberbildung beginnt erst, wenn bereits die erste Schalenwindung vollendet ist und die Larvenmerkrmale schon verschwunden sind.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408189
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 29
    Digitale Medien
    Digitale Medien
    Die parasitischen rädertiere mit besonderer berücksichtigung der in der umgegend von Minden I. W. Beobachteten Arten (1925)
    Springer
    Zoomorphology 3 (1925), S. 706-784 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00443879
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 30
    Digitale Medien
    Digitale Medien
    Nervous system of ascidian larvae: Caudal primary sensory neurons (1982)
    Springer
    Zoomorphology 99 (1982), S. 103-115 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In larvae of Diplosoma macdonaldi one sensory nerve extends along the dorsal midline of the tail and another extends along the ventral midline. Each nerve is composed of 50–70 naked axons lying in a groove in the base of the epidermis, and each projects to the visceral ganglion. The cell bodies of the caudal sensory neurons occur in pairs within the epidermis, and are situated along the courses of the nerves. A single cilium arises from an invagination in the soma of each neuron, passes through the inner cuticular layer of the tunic and enters a tail fin formed by the outer cuticular layer. We propose that these cells are mechanoreceptors. The caudal sensory system is similar in representative species of ten families of ascidians.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310303
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 31
    Digitale Medien
    Digitale Medien
    Structure of tendon organs in fishes of the genus Polymixia (1982)
    Springer
    Zoomorphology 99 (1982), S. 131-144 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Modified branchiostegal rays 1 through 3 support the proximal end of the paired hyoid barbels in the beardfish (Beryciformes: Polymixiidae). The polymixiid barbel is unusual in that it has an unique intrinsic muscular system. Using silver impregnation and electron microscopic techniques, unencapsulated, free nerve endings were located within the tendon of the third modified branchiostegal ray. Branchiostegal rays 1 and 2 do not have any free nerve endings associated with their tendons, however. It is suggested that the free nerve endings are proprioceptors acting as stretch-sensitive mechanoreceptors, and that branchiostegal ray 3 acts as part of a sensory apparatus for monitoring the positional state of the barbel. Branchiostegal rays 1 and 2 merely provide support for the barbel.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310305
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 32
    Digitale Medien
    Digitale Medien
    Ultrastructure of gill bars of Branchiostoma lanceolatum with special reference to gill skeleton and blood vessels (Cephalochordata) (1982)
    Springer
    Zoomorphology 99 (1982), S. 167-180 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The skeletal rods of the gill bars of Branchiostoma have been examined histochemically and electron microscopically. The rods are composed of 15-nm thick filaments which are interconnected by 10-nm thick and 15-nm long cross-linkages. The filaments appear to consist of structural proteins that are totally different from the proteins of the collagen fibrils. The cross-linkages between the filaments consist of acid mucopolysaccharides, and probably include chondroitin sulphate. The fine structure of blood vessels in the gill bars has been studied in uninjected specimens and in those intravascularly injected with either india ink or horseradish peroxidase. Blood vessels surrounded by basal laminae of delimiting epithelia or simply surrounded by connective tissue material are present in the gill bars. Very characteristic blood cells are normally found in these vessels. Furthermore, when either india ink or horseradish peroxidase is injected via the aorta and the endostylar vessel, irregular slitlike channels can be seen in the connective tissue. These channels are in open connection with the blood vessels and are thus a part of the vascular system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310308
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 33
    Digitale Medien
    Digitale Medien
    Microstructure of wood char (1982)
    Springer
    Wood science and technology 16 (1982), S. 19-34 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The exposure of wood treated with a commercial fire retardant chemical to fire conditions resulted in different patterns of char and fissure development than are seen in untreated whole wood. In addition microstructural observations demonstrated the existence of particulate fire retardant residues in char from treated wood. The source and mode of growth of these particles is considered as well as effects of fire retardants on crack growth, char development and overall appearance of chars from treated wood.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351372
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 34
    Digitale Medien
    Digitale Medien
    Production of phenols and charcoal from bagasse by a rapid continuous pyrolysis process (1982)
    Springer
    Wood science and technology 16 (1982), S. 59-66 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Tar and charcoal could be produced in high yields from bagasse by applying a rapid continuous pyrolysis process at a relatively low temperature. The ether extractives of the pyrolytic tar and oil amounted to 9.4% based on bagasse. Phenols represented 79% of these extractives. Gas chromatographic separation showed that guaiacol and its derivatives constituted 38% of the identified simple phenols. There were much smaller amounts of syringol and none at high pyrolysis temperatures. Depithing did not reduce the ash content of the charcoal, but it yielded an environmentally clean charcoal containing practically no sulfur or nitrogen. It was necessary to remove the fine particle size fraction of the bagasse after grinding in order to reduce the ash content of the charcoal. The carbon content of the charcoal increased rapidly with increasing temperature, and reached 96% at 720°C. The charcoal had a remarkably high adsorption capacity despite the fact that it had not been subjected to any activation treatment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351374
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 35
    Digitale Medien
    Digitale Medien
    IAWS bulletin board (1982)
    Springer
    Wood science and technology 16 (1982), S. 81-82 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351096
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 36
    Digitale Medien
    Digitale Medien
    Alkaline degradation of spruce and beech wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 155-164 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The alkaline delignification of spruce and beech wood is accomplished in three phases. The first phase results in a decrease of yield down to 83...80%, the second one in a decrease from 83...80% to 64...61% and the third one in a yeld drop from 64...61% to 50...46%. The amount of polysaccharides removed in the first phase was 22%, in the second phase 5...6% and in the third phase 10% of the total polysaccharides in the original wood. The amount of lignin removed in the first phase of delignification was 9...11% in the second phase 53...54% and in the third phase 28% of the total lignin in the original wood. The polysaccharides extracted in the second and third phase amounted to 70...78% of the polysaccharides removed in the first delignification phase. For an entire characterization of the delignification reaction not only the course of lignin removal is of importance but also the course of the polysaccharide extraction. The results show that for a two-stage alkali-oxygen-cooking technology the optimum yield after initial partial alkaline delignification lies in the range of 64...61%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351100
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 37
    Digitale Medien
    Digitale Medien
    Topochemistry of delignification in Douglas-fir wood with soda, soda-anthraquinone and karft pulping as determined by SEM-EDXA (1982)
    Springer
    Wood science and technology 16 (1982), S. 139-153 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Delignification studies on 0.5 μm sections of Douglas-fir earlywood tracheids pulped by soda, soda-anthraquinone (soda/AQ) and kraft pulping processes were performed by determining bromine concentrations in various morphological regions with SEM-EDXA technique. Soda/AQ pulping was much more selective in removing lignin from the middle lamella regions than either soda or kraft pulping. However, up to 50% delignification, more lignin was removed from the secondary wall by soda or kraft, compared to soda/AQ pulping. The kinetics of lignin removal in the various morphological regions were established. Addition of AQ and sodium sulfide resulted in an earlier transition from a slow initial to a rapid bulk delignification, particularly in the middle lamella, and in an enhanced bulk delignification in the secondary wall. Anthraquinone was also found to promote residual delignification in the secondary wall, where sodium sulfide was not effective. The opposite was observed for the bulk delignification in the middle lamella, where only sodium sulfide addition improved the rate significantly. The great differences observed in the bulk delignification rates between middle lamella and secondary wall in soda pulping as well as their response to additives suggest structural differences between middle lamella and secondary wall lignins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351099
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 38
    Digitale Medien
    Digitale Medien
    A study of lignification in loblolly pine tracheids by the SEM-EDXA technique (1982)
    Springer
    Wood science and technology 16 (1982), S. 167-179 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The lignification process in different morphological regions of loblolly pine tracheids was studied by the SEM-EDXA technique. Prior to S2 layer formation, lignification was initiated in the cell corner middle lamella and compound middle lamella regions. Subsequently a rapid lignin deposition was observed in both regions, whereas secondary wall lignification was a more gradual process and initiated when the middle lamella lignin concentration was approximately 50% of maximum. Within the secondary wall, the S1 layer is lignified first. Then, lagging just behind cell wall formation, lignification of the S2 layer is initiated adjacent to the S1 layer and extends toward the lumen. Finally, the S3 layer lignified. Upon completion of lignification, the cell walls had a higher concentration of lignin in both the S1 and S3 layers than in the S2 layer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353866
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 39
    Digitale Medien
    Digitale Medien
    Participation of singlet oxygen in the photodegradation of wood surfaces (1982)
    Springer
    Wood science and technology 16 (1982), S. 193-201 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Photodegradation of wood surfaces in the presence of oxygen was studied. ESR studies revealed that free radicals were formed at the wood surface during photoirradiation. These wood free radicals readily interacted with oxygen molecules to form peroxide radicals. Iodometry UV absorption studies showed that hydroperoxide was formed in the photoirradiated wood. The hydroperoxide concentration increased when wood was irradiated in the presence of singlet oxygen generators such as Rose Bengal and Methylene Blue. Hydroperoxide concentration decreased when wood was irradiated in the presence of singlet oxygen quenchers such as 1,4-diazobicyclo (2,2,2) octane, β-carotene and triethylamine. These findings imply the participation of singlet oxygen in the photodegradation of wood surfaces. The mechanisms of formation of singlet oxygen and hydroperoxide during photoirradiation are proposed. The consequence of hydroperoxide decomposition reactions on the discoloration and degradation of wood surface is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353868
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 40
    Digitale Medien
    Digitale Medien
    Indirect identification methods for the elastic constants of orthotropic materials and their application to wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 215-222 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary This paper concerns the elaboration of a method for the determination of elastic constants of orthotropic bodies with particular application to wood. It is based on the finite element calculation (displacement pattern) of thin plate samples and on the experimental measurement of the deflections at particular points under a simply imposed load.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353870
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 41
    Digitale Medien
    Digitale Medien
    Book reviews (1982)
    Springer
    Wood science and technology 16 (1982), S. 239-240 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353872
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 42
    Digitale Medien
    Digitale Medien
    Calcium promoted phenolic coupling by superoxide radical —a possible lignification reaction in wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 71-78 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The reaction of enzymatically generated superoxide radical with coniferyl alcohol in aqueous solution at pH 8.0 was studied. In the absence of calcium (II) no reaction occurred, but with a calcium (II) concentration of about 50 mM or more, coniferyl alcohol was oxidized by the superoxide radical. Dehydrodiconiferyl alcohol and pinoresinol were identified in the reaction mixture. From this result it is concluded that in the presence of calcium (II) the superoxide radical can achieve a one electron oxidation of coniferyl alcohol. It is suggested that a superoxide-generating enzyme outside the cell wall is responsible for the lignification. This suggestion is based on knowledge of the pore structure of wood cell walls, the high calcium concentration in non-lignified cells, the course of lignification and the existence of superoxide-producing enzyme systems in plant cell walls.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351376
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 43
    Digitale Medien
    Digitale Medien
    Book reviews (1982)
    Springer
    Wood science and technology 16 (1982), S. 79-80 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351377
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 44
    Digitale Medien
    Digitale Medien
    Recent progress in the chemistry and topochemistry of compression wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 83-122 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary A review of the chemistry and topochemistry of compression wood with 200 references. Compression wood contains on the average 30% cellulose, 35–40% lignin, 10% galactan, 9% galactoglucomannan, 8% xylan, and 2% of a 1,3-glucan (laricinan). The cellulose is less crystalline, and the xylan has fewer arabinose side chains than in normal wood. The lignin is composed of guaiacylpropane and p-hydroxyphenylpropane units. It is more condensed, has a higher proportion of carbon-carbon bonds, and contains fewer arylglycerol-β-aryl ether structures than a normal conifer lignin. The ray cells and the primary wall of the tracheids have the same chemical composition in normal and compression woods. The galactan is largely located in the outer region of the secondary wall. Only 5–10% of the lignin in compression wood tracheids is extracellular. The middle lamella is less lignified than in normal wood, while the S1 and inner S2 layers have a lignin concentration of 30–40% which is twice as high as in normal wood. The lignin content of the S2 (L) layer is equal to or higher than that of the intercellular region along the wall. The review is concluded with a brief reference to areas where present information is incomplete or lacking.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351097
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 45
    Digitale Medien
    Digitale Medien
    A model for bound-water transport in wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 123-138 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary A model for the isothermal transport of bound water through the cell wall of wood is developed, based on the assumption that the driving force for moisture movement is the gradient of “spreading” pressure ϕ, as first proposed by Babbitt (1950). This pressure is a surface phenomenon, derivable from the surface sorption theory of Dent (1977), a modification of the BET sorption theory. The force resisting moisture transport is assumed to be inversely proportional to moisture content and directly proportional to the equivalent viscosity of the sorbed water, calculated to be orders of magnitude larger than that of free water. The coefficients normally used to describe isothermal moisture transport in wood are derived from the model, and their predicted behavior as functions of the relative vapor pressure h of the cell wall are described graphically. An attempt is made to calculate a quantitative magnitude for the diffusion coefficient D, based on an assumed relationship between viscosity and the activation energy for water diffusion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351098
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 46
    Digitale Medien
    Digitale Medien
    IAWS bulletin board (1982)
    Springer
    Wood science and technology 16 (1982), S. 165-165 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353864
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 47
    Digitale Medien
    Digitale Medien
    NATO ASI-Programme on “Biomass Utilization” (1982)
    Springer
    Wood science and technology 16 (1982), S. 166-166 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353865
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 48
    Digitale Medien
    Digitale Medien
    Activities of some enzymes of lignin formation in reaction wood of Thuja orientalis and Metasequoia glyptostroboides 2 (1982)
    Springer
    Wood science and technology 16 (1982), S. 287-291 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary To elucidate biochemical features leading to p-hydroxyphenyl-rich lignin in gymnosperm reaction wood the activities of the following five enzymes involved in the biosynthesis of p-hydroxyphenyl lignin were compared in reaction and opposite woods: phenylalanine ammonialyase (EC 4.3.1.5), cinnamate 4-hydroxylase (EC 1.14.13.11), p-hydroxycinnamate: CoA ligase (EC 6.2.1.12), cinnamyl alcohol dehydrogenase (EC 1.1.1.-) and peroxidase (EC 1.11.1.7). The enzyme activities in the reaction woods of Thuja orientalis and Metasequoia glyptostroboides were remarkably higher than those in the opposite woods, reflecting the higher contents of p-hydroxyphenyl lignin in reaction wood.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353155
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 49
    Digitale Medien
    Digitale Medien
    Studies on wood gluing (1982)
    Springer
    Wood science and technology 16 (1982), S. 293-303 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The purpose of this paper was to clarify the gluability and adhesion mechanism of polypropylene as a hot melt wood adhesive for plywood bonding. The gluability of plywood glued with nonpolar and modified polypropylene satisfied approximately the specification of the Japan Agricultural Standard, Designation Types 1 and 2. The moisture content (8 to 25 %) of the core veneer had no recognizable effect on gluability. The durability of polypropylene and that of modified polypropylene were the same as that of melamine-formaldehyde resin. Molten polypropylene made good contact with veneer surface, and penetrated into the lumina of wood cells and other spaces. In the separated glue lines, casts of glue which had penetrated into the vessels had many mushroom-like projections which had filled the bordered pit cavities. It was indicated that the anchoring effect of polypropylene which had penetrated into various wood elements and spaces in the veneer contributed dominantly to the gluability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353157
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 50
    Digitale Medien
    Digitale Medien
    The periderms of three North American conifers (1982)
    Springer
    Wood science and technology 16 (1982), S. 305-316 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The anatomy of periderms in three North American conifers are described and compared. The phellems of balsam fir and eastern hemlock consist of tangential bands of thin-walled phellem (TnP) separated by one, or sometimes more, cell layers of thick-walled phellem (TkP). The phellem of white spruce contains tangential bands of TnP and TkP, as well as one to several cell layers of crystalliferous phellem (CP) abaxially adjacent to every TkP zone. The TkP, and to a lesser extent the TnP, are distinctive for each of the three conifers. The terminations of phellem growth cycles in fir and hemlock are delineated by thickened adaxial suberinic walls in the last-formed layer of TnP cells. In spruce, the adaxial suberinic walls of the last-formed layer of CP cells are thickened. TkP marks the geginning of phellem growth cycles in all three conifers. TkP cells are “true” suberized phellem cells, not phelloids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353159
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 51
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 286-286 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353154
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 52
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 292-292 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353156
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 53
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 304-304 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353158
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 54
    Digitale Medien
    Digitale Medien
    Fifteenth International Particleboard Symposium held at Washington State University Structural Products, Special Considerations and Binders (1982)
    Springer
    Wood science and technology 16 (1982), S. 317-320 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353160
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 55
    Digitale Medien
    Digitale Medien
    Minenstudien VI (1925)
    Springer
    Zoomorphology 4 (1925), S. 502-539 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408466
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 56
    Digitale Medien
    Digitale Medien
    Zum problem des tierischen Parasitismus. I. Teil: Die lebensweise der Schmarotzerbiene Sphecodes monilicornis K. (= Subquadratus SM.) (Hym. Apid.) (1925)
    Springer
    Zoomorphology 4 (1925), S. 430-464 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung Sphecodes monilicornis fliegt nach Art anderer Schmarotzerbienen an den Nestern des Halictus malachurus K., dringt in diese ein und belegt die von Halictus gegrabenen, mit Futtervorrat versehenen Kammern mit einem Ei. Da er also die vom tHalictus für dessen Nachkommenschaft geleistete Arbeit zur Beherbergung und Aufzucht der Halictus-Larven bzw. die Arbeitsprodukte selbst (Kammer und Futterballen) für seine eigene Brut ausnutzt, ist er ein echter Arbeitsschmarotzer, wie andere Kuckucksbienen, Nomada, Coelioxys, Melecta usw., auch. Er unterscheidet sich aber von diesen 1. durch seinen Kampf mit den Wirtstieren (der aber nicht unbedingt stattzufinden braucht, vgl. S. 447 ff), 2. durch den Verschluß der Kammern und des Flugloches, beides Arbeitsleistungen, die Halictus malachurus K. zwar nicht verrichtet, wohl aber bei allen anderen arbeitenden solitären Bienen zu beobachten sind. Der Schaden, den Sphecodes monilicornis seinem Wirt zufügt, ist meines Erachtens größer als bei anderen Kuckucksbienen. Nicht nur vermindert er, wie andere Schmarotzerbienen auch, durch die Besitznahme einer Anzahl fertiger Kammern dessen Nachkommenschaft, er schließt außerdem durch seine Kämpfe eine Reihe geschlechtsreifer Weibchen von weiterer Eiablage überhaupt aus).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408464
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 57
    Digitale Medien
    Digitale Medien
    Zum morphologischen feinbau der kieselschwammnadeln (1925)
    Springer
    Zoomorphology 4 (1925), S. 615-625 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407654
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 58
    Digitale Medien
    Digitale Medien
    Biologische reisestudien in südamerika. VII. Notiz über einen bastard zwischen hund und pampafuchs (Pseudalopex [Canis] agarae), nebst bemerkungen über die systematik der argentinisch-chilenischen füchse (1925)
    Springer
    Zoomorphology 4 (1925), S. 685-701 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407677
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 59
    Digitale Medien
    Digitale Medien
    Über den optischen nachweis von lipoiden in den wimperplättchen der ctenophoren (1925)
    Springer
    Zoomorphology 4 (1925), S. 674-684 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. Die Umkehr des positiven optischen Charakters der Ruderplättchen der Ctenophoren läßt sick nicht nur durch Zuckersirup und Glycerin —wie Göthlin entdeckte — sondern auch durch Alkohol, Essigsäure, Natronlauge, Ammoniakwasser, Erwärmen, Trocknen der Plättchen herbeifiihren. 2. Dieser Vorgang beruht, wie Göthlin richtig vermutete, hier durch Beobachtung im einzelnen bewahrheitet wind, auf einer orientierten Einlagerung von Lipoiden: denn in manchen der genannten Versuche lassen sich die Lipoidteilchen unter starken Vergrößerungen unmittelbar als kleinste Stäbchen erkennen, die negativ doppelbrechend in bezug auf die Lange and mit dieser den Wimperhaaren parallel angelagert rind. 3. Da die Umkehr des optischen Charakters durch sehr verschiedenartige Eingriffe ausgelöst werden kann — nicht nur durch Schrumpfung bewirkende Flüssigkeiten! —, SO iSt Göthlins (für graue Nerven ausgesprochene) Vermutung, es handle sich um eine Orientierung bereits vorhandener Lipoidteilchen infolge Querschrumpfung eines fibrillären Gefüges (wenigstens für die Wimperplättchen der Ctenophoren) abzulehnen. 4. Vielmehr führen die sonst bekannten Tatsachen über orientierte Einlagerung von Substanzen in fibrilläre Strukturen zur Deutung, daß die zunächst maskierten Lipoide durch die genannten Eingriffe, vermutlich aus der Kittmasse, in Freiheit gesetzt and dabei von den Wimperhaaren orientiert adsorbiert werden. 5. Nach Entfernung der orientiert eingelagerten Lipoide durch geeignete Lösungsmittel (wie sie sich übrigens bei Behandlung der Schwimmplättchen mit Alkohol schließlich von selbst einstellt), hinterbleibt eine positive Doppelbrechung, deren Stärke aber stets schwächer ist als die ursprüngliche, was mit Änderungen im regelmäßigen Verlauf und im Feinbau der Flimmerhaare des Plättchens zusammenhangen dürfte. 6. Der auf optischem Wege erbrachte Nachweis so erheblicher Mengen,von Lipoiden in den Wimperplattchen der Ctenophoren wirft zunächst die Frage each ihrer physiologischen Bedeutung auf — Schutz der Fibrillen vor Verquellung, Betriebsmaterial fur die Wimperbewegung? —und regt zu Nachforschungen darüber an, ob in allen Cilien Lipoide in so auffälliger Menge vorhanden Bind.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407656
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 60
    Digitale Medien
    Digitale Medien
    Vergleichend-morphologische untersuchungen der gnathocoxen der araneen (1925)
    Springer
    Zoomorphology 4 (1925), S. 711-738 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. Die Aviculariidae besitzen Gnathocoxen, die sick besonders durch folgende Eigentümlichkeiten vor den Gangbeinhüften auszeichnen: Ihre Unterseite ist nach vorn vorgezogen. Das Distalende des Vorderrandes der Unterseite endet in ein Zipfelchen. 2. Die Atypidae besitzen Gnathocoxen mit folgenden Merkmalen: Der distale Endzipfel ist zu einer machtigen Lade geworden. Die Unterseite ist nosh stärker verbreitert als bei den Aviculariidae. 3. Die Gnathocoxen aller Tetrapneumones liegen in einer Ebene mit den Laufbeinhüften, also horizontal. 4. Die Gnathocoxen der Dipneumones liegen stets mehr oder weniger vertikal, wie auch die Cheliceren. 5. Die Pedipalpenhüften der Dipneumones lassen sich folgendermaßen kennzeichnen: Die Ventralseite ist außerordentlich nach vorn distal verbreitert. Die Dorsalseite ist ganz schmal. Sie inserieren am Labrumsockel. Die Lade ist der der Atypidae and damit auch dem Endzipfel und der Unterseitenverbreiterung der Aviculariidae homolog. 6. Die Dysderidae besitzen Gnathocoxen, die noch deutlich den Hüftteil vom Ladenteil unterscheiden lassen. Auch ist bei ihnen noch die Coxalleiste in ihrer urspriinglichen Gestalt zu finden. 7. Die Dipneumones besitzen einen vertikalen präoralen Mundraum, der von beiden Laden and im proximalsten Teile der Ober- und der Unterlippe gebildet wird. 8. Die Skorpione haben einen horizontalliegenden Vormundraum. Er wird gebildet von den Unterseiten beider Pedipalpenhiiften, der Oberlippe und den Laden der beiden ersten Beinpaare. 9. Die Laden der ersten beiden Beinpaare vertreten die Unterlippe bei den Skorpionen. 10. Es ist unwahrscheinlich, daß der Besitz von Kauladen bei den Arachniden ein urspriingliches Merkmal ist, da man dann annehmen müßte, daß diese einst kauen konnten and diese Fähigkeit verloren hätten. 11. Die Mundbildung der Skorpione ist sehr kompliziert. Sie bedeutet den Endpunkt einer Entwicklung. 12. Die Mundbildung der Skorpione ist von allen lebenden Arachniden so gründlich verschieden, daß wir annehmen miissen, she sei isoliert von der Entwicklung der übrigen Gruppen innerhalb der Ordnung ausgebildet worden.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407679
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 61
    Digitale Medien
    Digitale Medien
    Biologische reisestudien in Südamerika (1925)
    Springer
    Zoomorphology 3 (1925), S. 150-168 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407619
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 62
    Digitale Medien
    Digitale Medien
    Die entwicklung des Männlichen spinnentasters, dargestellt an leptyphantes nebulosus sund (1925)
    Springer
    Zoomorphology 5 (1925), S. 98-118 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. Bei der dritten Häutung des Spinnenmännchens entsteht am Tasterende eine große, helle Blase, der spätere Bulbus und Tarsus. Vor der Häutung ist die zusammengelegte Haut desselben in einer kleinen spindelförmigen Auftreibung des Tasterendes sichtbas. 2. Die Entuicklung der Organe des Bulbus beginnt distal in der Blase mit dem Auftreten der Primäranlage. 3. Die Primäranlage teilt sich in zwei Teile. Es entwickeln sich aus den beiden Teilen lateral die Capsula und medial das Stema. 4. Der Samenkanal wächst nicht von einer Stelle aus, sondern wird an mehreren Stellen gleichzeitig gebildet, so daß er kurz nach seinem Auftreten von seinem blinden Ende in der Capsula bis zu seinem Austritt aus dem Stema auf den Embolus eine Einheit bildet. 5. Die erste Anlage des Tarsus (Cymbium) findet sich proximal in der Blase als Chitinkern. Von tort wächst das Cymbium lateral um die Capsula herum, so daß these in einer Aushö:hlung des Cymbiums liegt. 6. Die Funktion der nahe dem Ende des Kanals gelegenen sogenanntenFickertschen Drüse ist nicht die einer Drüse, sondern die, bei der Ejaculation des Samens mechanisch behilflich zu sein. 7. Ein Schluß auf die phylogenetische Entwicklung des Bulbus läßt sich aus seiner Ontogenie nicht ziehen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408888
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 63
    Digitale Medien
    Digitale Medien
    Correlation zwischen den antennalen geruchs-organen und der biologie der musciden (1925)
    Springer
    Zoomorphology 5 (1925), S. 1-97 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408887
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 64
    Digitale Medien
    Digitale Medien
    Zur regeneration der actiniarien (1925)
    Springer
    Zoomorphology 5 (1925), S. 150-154 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408890
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 65
    Digitale Medien
    Digitale Medien
    Morphological basis of cardiac glycoside sequestration by Oncopeltus fasciatus (Dallas) (Hemiptera: Lygaeidae) (1982)
    Springer
    Zoomorphology 99 (1982), S. 87-101 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The integument of Oncopeltus fasciatus is made up of a vacuolated and a pigmented epidermal cell layer. This double layered integument is present from late embryo to adult in male and female animals reared on milkweed or sunflower seeds. Experiments with a labelled glycoside as well as retrograde ink injections suggest that O. fasciatus concentrates cardiac glycosides, normally derived from the host plants, within the vacuolated epidermal cell layer throughout its life cycle. In the adult, droplets of glycoside-rich fluid appear at precise points along the dorsolateral margins when external pressure is applied to the thorax and abdomen. This pressure causes separation of cuticular flanges in the metathoracic epimeral lobe and rupture of the cuticle in restricted areas in the mesothorax and abdomen. In addition the pigmented epidermal cell layer and the distal membranes of the vacuolated epidermal cell layer rupture with the result that the contents of the vacuolated cell layer are eliminated onto the surface of the animal where they are retained as discrete droplets by the cuticular morphology. Release of cardiac glycosides into the haemolymph is prevented by a thick basal lamina on the haemolymph side of the vacuolated epidermal cells. No specialized muscles involved with fluid release were observed. The vacuolated epidermal cells do not show ultrastructural features characteristic of actively transporting tissues, i.e., abundant mitochondria and elaborate membrane infoldings. This suggests that glycoside sequestration is essentially a passive process and should not be associated with any physiological cost. Large concentration gradients of cardiac glycosides are maintained across the basal lamina, basal plasma and vacuolar membranes of the vacuolated epidermal cell layer. Possible mechanisms by which O. fasciatus is able to concentrate cardiac glycosides as well as the possible function of this phenomenon are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310302
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 66
    Digitale Medien
    Digitale Medien
    Electron microscope investigation of synapses, synapse-like structures, and possible sites of release of neurosecretory material in the buccal ganglia of Helix pomatia (Mollusca) (1982)
    Springer
    Zoomorphology 99 (1982), S. 145-153 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In the buccal ganglia of Helix pomatia synapses and sites of possible release of neurosecretory material were investigated electron microscopically. There is one chemical synapse and one electrotonic synapse in the neuropile of the ganglion. No synapses could be detected in the buccal nerves, cerebro-buccal connectives, or in the buccal commissure. The synaptic cleft of the chemical synapse is about 25 nm wide and contains electron-dense material whereas the cleft of the electrotonic synapse is only 5 nm wide. The presynaptic fibre of the chemical synapse contains clear vesicles and dense core vesicles. The release sites of neurosecretory material are found at the initial segment of the axons, at perikarya of neurones, and at the perineurium of the ganglion. If the terminals are located at the plasmalemma of a nerve cell, these release sites are called synapse-like structures according to Roubos and Moorer-van Delft (1979). The synapse-like structures show all structural elements of synapses, except the 25 nm cleft containing dense material; the cleft is only 15–20 nm wide here like the normal cleft between neurones and glial cells or between two fibres. If the secretory material is released at the periphery through the perineurium the terminal is called synaptoid according to Scharrer (1970). In all cases, i.e. synapses, synapse-like structures, and synaptoids, clear vesicles were found in the axon terminal. This finding provides further evidence that clear vesicles always accompany the release of substances from axon endings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310306
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 67
    Digitale Medien
    Digitale Medien
    The Dufour gland closing apparatus in Formica sanguinea Latreille (Hymenoptera, Formicidae) (1982)
    Springer
    Zoomorphology 99 (1982), S. 235-244 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A closing apparatus of the Dufour gland is described in the formicine ant Formica sanguinea Latreille 1798. Four sets of muscles are involved, two of which directly attach to the slit-like duct. The latter shows a considerable cuticular thickening of its intima at this level. Ultrastructural observations reveal that the muscles are attached to a cuticula by means of intracellular microtubules in the duct cells. These microtubules run parallel to the myofilaments. Together with the increased contact area for muscular attachments they are believed to ensure the accurate muscular mechanism assuring a well-controlled spraying activity of this gland. Opening of the duct is probably achieved by active muscular contractions, while its closure may be achieved by a passive return to the rest position of the thickened cuticular intima.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312297
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 68
    Digitale Medien
    Digitale Medien
    Evaluation of the quantitative assay of lignin distribution by SEM-EDXA-technique (1982)
    Springer
    Wood science and technology 16 (1982), S. 1-18 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary A method has been developed for the determination of lignin distribution in wood cell walls by studying bromine concentrations in 0.5 μm sections with scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM-EDXA) technique. Evaluation of backscattering, absorption and fluorescence effects on quantitative assay of lignin distribution indicated that these effects may all be ignored, if relative comparisons are made. Thus, a relative ratio of the measured Br-L X-ray intensities directly provides bromine concentration ratio, from which the ratio of lignin concentrations in different morphological regions can be estimated. Additionally, the effect of electron beam bombardment on bromine was found to be negligible. Therefore, the SEM-EDXA technique provides quantitative information of lignin distribution with relatively high accuracy. The potential and limitations of this technique were also elucidated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351371
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 69
    Digitale Medien
    Digitale Medien
    Acoustic emission from softwoods in tension (1982)
    Springer
    Wood science and technology 16 (1982), S. 35-57 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Acoustic emission (AE) monitoring is a non-destructive testing technique widely used to detect flaw development and crack propagation in metals, ceramics, polymers and composite materials. This paper relates the AE-strain characteristics from three softwoods tested in tension to mechanisms of deformation observed by scanning electron microscopy. All wood specimens are identical in size and radial-longitudinal in orientation, enabling the path of failure through planes of earlywood and latewood to be examined. It is found that the proportion of earlywood to latewood in each species has a marked effect on the shape of the AE-strain curves. Parana pine, containing very few latewood tracheids, exhibits a close to linear relationship between log cumulative emissions and strain until close to failure when the count rate increases rapidly. Douglas-fir, which has well-defined earlywood-latewood boundaries generates many AEs at low strain and there is greater variation in the shape of the AE characteristic between samples. Parana pine and Douglas-fir are tested at 20 °C (12.5 % EMC). Scots pine is also stressed at 20°C (12.5%EMC), 20°C (0.7%EMC) and 80°C (0.7%EMC), to assess the effect of moisture content on AE. Values of Young's modulus, stress at failure and work of fracture for the three softwoods are compared with the AE-strain data. Although the work of fracture is related to the total AEs to failure, no direct proportionality exists between the two parameters. Finally, the AE-strain data for plywood and glass-reinforced plastic (GRP), both man-made composite materials, are compared with those of wood, the natural composite material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351373
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 70
    Digitale Medien
    Digitale Medien
    The occurrence of benzyl non-cyclic ether bonds in lignin (1982)
    Springer
    Wood science and technology 16 (1982), S. 67-70 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary A reply to the note by Nimz (1981) on the occurrence of benzyl non-cyclic ether bonds in lignin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00351375
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 71
    Digitale Medien
    Digitale Medien
    A model for testing the efficiency of material selection using life data (1982)
    Springer
    Wood science and technology 16 (1982), S. 223-237 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary An extension is made to a previously proposed reliability-based procedure for characterizing the duration of load properties of wood. This extension provides a methodology for testing if two disjoint nominal populations of wood specified by modulus of elasticity have significantly different time to failure distributions at a given applied stress. This extension has practical application in the assignment of grades to structural lumber and in determining the dependence of time to failure on grade, species, and size.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353871
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 72
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 259-260 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353148
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 73
    Digitale Medien
    Digitale Medien
    On the fracture morphology in wood (1982)
    Springer
    Wood science and technology 16 (1982), S. 241-259 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Structural changes in spruce and aspen wood samples subjected to axial compression were examined by means of the scanning electron microscope. For comparison, macroscopic model experiments were carried out on tube-shaped samples made of paper so as to represent segments of fibriform xylem cells. The results show that there are fracture patterns characteristic of wood in general and others characteristic of the species of wood. The phenomena characteristic of wood in general are prevalent at the cellular level and in the fracture behaviour of the cell wall layers and perforations. The characteristics of the various species of wood dominate at the level of the growth rings and are decisively influenced by the composition and arrangement of the tissues. The model experiments show that the failure morphology of the individual cells of the xylem may be explained to some extent by their geometry.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353147
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 74
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 277-278 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353152
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 75
    Digitale Medien
    Digitale Medien
    Comparative studies on lignin distribution by UV microscopy and bromination combined with EDXA (1982)
    Springer
    Wood science and technology 16 (1982), S. 269-277 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary In order to elucidate a previously reported discrepancy in the ratio of the lignin concentration in the middle lamella to that in the secondary wall as determined by ultraviolet (UV) microscopy and bromination combined with EDXA, the ultraviolet absorptivity of the lignin and the lignin reactivity towards bromination were compared for black spruce wood (Picea mariana Mill.). In addition, UV microscopy and EDXA techniques were applied to the determination of lignin distribution in the tracheids in order to establish the relationship between the two techniques. The results indicated that, although the ultraviolet absorptivity in different morphological regions is essentially the same, the secondary wall lignin was 1.70 times more reactive towards bromination than the middle lamella lignin. By applying the value of 1.70 as a correction to the EDXA results, the estimated lignin distribution by EDXA was in fairly good agreement with that from UV microscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353151
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 76
    Digitale Medien
    Digitale Medien
    Relationship between ball milling and the susceptibility of wood to digestion by cellulase (1982)
    Springer
    Wood science and technology 16 (1982), S. 279-285 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Aspen wood was ball milled for times as long as 10 days. The change in wood morphology was examined in the ultraviolet microscope. The accessibility of the milled wood to cellulase was also determined. Soon after the commencement of the milling, part of the wood took on a characteristic appearance in which the cell wall material was completely broken down. The proportion of this disordered wall material (DWM) increased with increased time of milling. The accessibility to cellulase increased with the proportion of DWM produced by the milling.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353153
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 77
    Digitale Medien
    Digitale Medien
    Apical control of branch movements in white pine: Compression wood action (1982)
    Springer
    Wood science and technology 16 (1982), S. 181-191 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary The movements of branches or control stem girdled white pine (Pinus strobus L.) were analyzed using beam theory. The stresses generated in the compression wood (CW) produced bending moments to counter the added bending moments due to new branch growth. The branches on the treated trees produced additional CW after untreated trees stopped elongation and diameter growth. The intensity of the stresses in this additional CW was greater than in the other CW. Thus, branches on treated trees moved up vertically well beyond their initial orientation due to both more CW and more active CW. The branches on untreated trees all deflected downward as branch weight continued to increase after CW production stopped.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353867
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 78
    Digitale Medien
    Digitale Medien
    Bending creep behavior of Acer Saccharum marsh veneered medium-density fiberboard composite (1982)
    Springer
    Wood science and technology 16 (1982), S. 203-213 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary This study was to determine the effects of shelling ratio (SR) 0.200, 0.314, and 0.400, relative humidity (RH) 50, 64, 78, and 92 percent, and temperature (T) 10°C, 24°C, and 38°C, on the initial elastic (YE) deformation, irrecoverable creep (YIR) and creep deformations (YC) of sugar maple-veneered-medium-density fiberboard (MDF) composite panels 16 mm thick, 229 by 584 mm in size for the purpose of developing a hardwood composite. This composite would possess creep resistance comparable to conventional softwood plywood and lumber. The YE, YC, and YIR of all composite panels were significantly (at 0.05 level) affected by the SR, RH, and T in this study. However, no differences in creep deformations were found in all specimens between the SR of 0.314 and 0.400, between the RH of 50 and 64 percent, and between the T of 10°C and 24°C conditions. Composite panels with an SR value of 0.314 and 0.400 had YC values approaching that of maple lumber. Panels with SR value of 0.200 displayed lower average YE, YC, and YIR values than those of the Douglas-fir plywood. The effect of T on creep deformation was small when compared to the effects of SR and RH. The YIR accounted for almost 2/3 of the YC for all composite panels. Predicted YE, YC, and YIR values obtained from the multiple regression models predict very well the observed test values. The creep behavior of the composites was explained well by a power-law equation in log-log form for periods of 2 to 10 minutes and 10 to 100 minutes. Reasonable approximations of YC at 2-week intervals were made by extrapolating the short-term creep test results of 10 to 100 minutes log-log regression analysis oor the veneered-MDF composites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353869
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 79
    Digitale Medien
    Digitale Medien
    Book review (1982)
    Springer
    Wood science and technology 16 (1982), S. 268-268 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353150
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 80
    Digitale Medien
    Digitale Medien
    Chemical characterization of tissue fractions from the middle lamella and secondary wall of black spruce tracheids (1982)
    Springer
    Wood science and technology 16 (1982), S. 261-267 
    Details
    ISSN: 1432-5225
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Maschinenbau
    Notizen: Summary Elemental and functional group analyses were carried out on tissue fractions from the secondary wall and middle lamella of black spruce tracheids. The secondary wall lignin was found to contain 1.7 times as much methoxyl per C9 as the middle lamella lignin, indicating a substantial proportion of unmethylated para-hydroxyphenylpropane residues in the middle lamella. The content of carbonyl groups was at least three times larger in middle lamella lignin than in secondary wall lignin. The carboxyl content of the middle lamella was found to be about three times as large as that of the secondary wall. Elemental analyses show a higher carbon and lower oxygen content in the middle lamella than in the secondary wall.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00353149
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 81
    Digitale Medien
    Digitale Medien
    Ultrastructural characteristics of algal digestion by Climacostomum virens (Ciliata) (Ehrenberg) stein (1982)
    Springer
    Zoomorphology 100 (1982), S. 121-130 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Phagocytosis and digestion in Climacostomum virens were investigated using the flagellate Chlorogonium elongatum as food. The flagellates are pushed through the buccal tube to be enclosed in food vacuoles in the cytopharyngeal region at the base of the buccal tube. Cytopharyngeal vesicles contribute membrane to the forming food vacuoles. Within 3–5 min after ingestion, small vesicles, presumably primary lysosomes, surround the food vacuole and fuse with it. Electron-lucent folds develop in the food vacuole membrane 3–6 h after feeding. Electron dense evaginations from the vacuole are detected 9–24 h after ingestion. Folds and evaginations appear to be involved in the resorption and transport of digested material through the cytoplasm. Defecation of undigested residues at the cytoproct occurs 12–24 h after ingestion. The membrane of the defecation vacuole fragments to form numerous vesicles as the undigested residues are discharged.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310358
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 82
    Digitale Medien
    Digitale Medien
    Der Einfluß der Ernährung auf die Ultrastruktur der großen Zellen in den Mitteldarmdrüsen terrestrischer Isopoda (Armadillidium vulgare, Porcellio scaber) (1982)
    Springer
    Zoomorphology 100 (1982), S. 131-142 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Im Verlauf von 10wöchigem Nahrungsentzug unterliegen die großen Zellen der Mitteldarmdrüsen von Armadillidium vulgare und Porcellio scaber ultrastrukturellen Veränderungen, die denen entsprechen, welche von Ligia oceanica beschrieben wurden. Wiederfütterung mit verschiedenem Futter nach 6wöchigem Nahrungsentzug hat sehr verschiedene ultrastrukturelle Veränderungen zur Folge: Die dominierenden Merkmale sind Glykogen-Felder nach Saccharose-Gabe, elektronendichte Grana und große Vakuolen nach Protein, Lipideinschlüsse nach Butter und Fettkörper von Käferlarven sowie Sambucus-Blättern, Heterolysosomen nach Buchenlaub und Douglasien-Nadeln und elektronendichte Grana nach Bakterien (z.B. Bacillus subtilis). Das vielfältigste Bild zeigen die Zellen der Tiere, welche künstliches Nährmedium aufgenommen hatten.
    Notizen: Summary Over a 10-week period of food deprivation the large epithelial cells of the hepatopancreas of Armadillidium vulgare and Porcellio scaber undergo ultrastructural changes that correspond to the conditions described previously from Ligia oceanica. Refeeding with different diets after a starvation period of 6 weeks results in very different ultrastructural aspects of the large epithelial cells. The dominant features are as follows: glycogen deposits (after a sucrose diet), electron dense granules and large vacuoles (protein diet), lipid droplets (butter, fat body of beetle larvae, litter of Sambucus), heterolysosomes (litter of Fagus, needles of Pseudotsuga), and electron dense granules (bacteria, e.g. Bacillus subtilis). The most diversified ultrastructure was obtained 2 days after refeeding with an artificial diet.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00310359
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 83
    Digitale Medien
    Digitale Medien
    An ultrastructural examination of developing and mature euspermatozoa in pyrazus ebeninus (Mollusca, Gastropoda, Potamididae) (1982)
    Springer
    Zoomorphology 100 (1982), S. 157-175 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Mature and developing euspermatozoa of the prosobranch gastropod Pyrazus ebeninus, have been examined using transmission electron microscopy and phase-contrast light microscopy. The head of the mature euspermatozoon consists of a conical acrosome capping a short, rod-shaped nucleus (laterally compressed posteriorly). A basal invagination in the nucleus contains the proximal portion of the axoneme and a dense attachment matrix. Four apparently non-helical mitochondrial elements (two large, two small) comprise the midpiece each being composed of curved, inclined cristal plates and a granular matrix. The structure and arrangement of the mitochondrial elements is thus distinguishable from the helical midpiece elements found in euspermatozoa of neogastropods and most mesogastropods and possibly is widespread in the Cerithiacea. A dense ring-like structure is found closely applied to the inside of the plasma membrane at the junction of midpiece and glycogen piece. Acrosome and midpiece formation and nuclear condensation have been studied in developing euspermatozoa. Acrosome development is divided into two phases: (1) a pre-attachment phase — during which a complex early acrosome is formed often at great distance from the nuclear apex, and (2) an attachment/post-attachment phase — during which the completed preattachment phase acrosome tilts into position at the nuclear apex and subsequently elongates. The nucleus passes through a recognizable sequence of condensation phases (reticular, fibrillar and lamellar phases). Microtubules surround both the nucleus and midpiece in the final phase of maturation. The four, elongate midpiece elements of the mature euspermatozoon are apparently derived from the four large, spherical mitochondria of the euspermatid. The potential usefulness of spermatozoal ultrastructure with regard to indicating affinities between groups of gastropod families is briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311970
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 84
    Digitale Medien
    Digitale Medien
    The ultrastructure of the spermatozoon of Haplotaxis ornamentus (Annelida, Oligochaeta, Haplotaxidae) and its phylogenetic significance (1982)
    Springer
    Zoomorphology 100 (1982), S. 177-188 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The spermatozoon of Haplotaxis ornamentus has characteristics common to all oligochaete sperm: filiform; primary acrosome vesicle carried on an acrosome tube and containing an axial rod (perforatorium) in an invagination (subvesicular space or secondary acrosomal invagination); an elongate, highly condensed cylindrical nucleus followed by a cylindrical midpiece of radially adpressed mitochondria not penetrated by the axoneme; a single (distal) centriole persistent, though modified, at maturity; axoneme with 9 doublets, each with two outer glycogen granules, and centrally two singlets accompanied by two solid fibres. A peculiar haplotaxid combination of characters (none unique) is slight withdrawal of the primary vesicle into the acrosome tube with a strongly emergent capitulate axial rod and moderately short midpiece. This ultrastructure is consistent with location of the Haplotaxidae at the base of the Haplotaxida (Haplotaxina — Alluroidina — Moniligastrina — Lumbricina). Tubificida sperm, although also plesiomorph for the Oligochaeta, have the autapomorphy elongate periaxial sheath (secondary tube), excepting the Phreodrilidae whose sperm show convergent resemblances to the Lumbricina. The term annuloid has been introduced for annulus-like structures of varied origins.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311971
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 85
    Digitale Medien
    Digitale Medien
    Fine structure of the coelomic epithelium of Sagitta elegans (Chaetognatha) (1982)
    Springer
    Zoomorphology 100 (1982), S. 217-222 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The coelomic space in the trunk of the arrow worm Sagitta elegans is lined by a thin epithelium, which may be termed coelomic epithelium. The visceral part of this epithelium is composed of flat cells characterized by thin and thick myofilaments, which constitute the circular musculature of the gut. In addition mitochondria, rough ER, and smooth walled cisterns, as well as vesicular and granular inclusions occur; the apical and basal plasma membranes exhibit no particular specializations. The parietal epithelium is exceedingly thin and covers the muscle cells of the body wall. In the lateral fields columnar ciliated cells are to be found which are rich in rough ER cisterns and which apparently are also coelomic epithelial cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311974
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 86
    Digitale Medien
    Digitale Medien
    Anatomy of the cecum of the gerbil Meriones unguiculatus (Mammalia, Rodentia, Cricetidae) (1982)
    Springer
    Zoomorphology 100 (1982), S. 189-202 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The macroscopic and microscopic anatomy of the cecum of the gerbil was investigated using dissections, dried specimens and vascular injections as well as light-, scanning- and transmission electron microscopy. The cecum of the gerbil is a voluminous organ, possessing slight sacculations and only poorly developed taeniae. The base or ampulla ceci is slightly dilated and more voluminous than the corpus ceci, which decreases gradually in diameter to the blind-end, the apex ceci. A half ring-fold limits the entrance to the proximal colon from the ampulla. A wide-opened communication exists between ampulla and corpus ceci. The scanning microscopical appearance of the cecal wall takes the form of raised elevations circumventing a central depression. The cecum is lined internally by a tall columnar epithelium displaying a well-developed microvillar border and possessing numerous cellular organelles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311972
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 87
    Digitale Medien
    Digitale Medien
    Primordial germ cells and early stages of oogenesis in Ophryotrocha puerilis (Polychaeta, Dorvillediae) (1982)
    Springer
    Zoomorphology 100 (1982), S. 203-215 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Each setigerous segment of the protandric polychaete Ophryotrocha puerilis contains two primordial germ cells. A ventral furrow in the gut wall together with the peritoneal lining of the gut forms a genital blood vessel. The gonocytes are located within the peritoneum of this genital blood vessel. At sexual maturity the gonocytes undergo a proliferation cycle, the first division of which gives rise to a cell which is extruded into a forming outpocketing of the coelomic lining. The stem cell remains within the peritoneum. Inside the forming gonad the detached cell goes through a series of four mitotic divisions. The resulting 16 cells are interconnected by cytoplasmic bridges. These bridges are arranged in a very regular pattern which allows the mitotic cycles to be followed. While remaining still within the gonad the 16 cells begin to synthesize yolk and to take up exogenous yolk precursors. At this stage a differentiation into oocytes and nurse cells becomes visible. The oocytes deposit yolk platelets of the definitive size whereas the polyploid nurse cells produce only small yolk bodies that are passed to the adjacent oocytes. In a later stage the cell bridges between adjacent nurse cells are cut and pairs of one oocyte and one nurse cell are released to the coelomic cavity during breakdown of the gonadal sac. Oocyte-nurse cell-complexes then freely float in the coelomic fluid. The proliferation of gonadal cells is well synchronized within one segment. In anterior segments, however, gonadal proliferation usually begins earlier than in posterior segments but smaller oocytes in posterior segments catch up within a few days. Finally a batch of oocytes is produced in which all the oocytes are of the same size (120 μm). The origin of the primordial germ cells remains unknown.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00311973
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 88
    Digitale Medien
    Digitale Medien
    Ultrastructure of multiciliated collar cells in the pilidium larva of Lineus bilineatus (Nemertini) (1982)
    Springer
    Zoomorphology 101 (1982), S. 1-15 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The ultrastructure of the apical plate of the free-swimming pilidium larva of Lineus bilineatus (Renier 1804) is described with particular reference to the multiciliated collar cells. In the multiciliary collar cells there are several, up to 12, cilia surrounded by a collar of about 20 microvilli extending from the cells' apical surface. The cilia have the typical 9+2 axoneme arrangement and are equipped with striated caudal rootlets extending from the basal bodies. No accessary centriole or rostral rootlet were observed. Microvilli surrounding the cilia are joined in a cylindrical manner by a mucus-like substance to form a collar. In comparison with many sensory receptor cells built on a collar cell plan the multiciliary collar cells of the pilidium larva apical plate are rather simple and unspecialized. In other pilidium larvae monociliated collar cells are found in the apical plate. The possible function and phylogenetic implications of multiciliated collar cells in Nemertini are briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312027
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 89
    Digitale Medien
    Digitale Medien
    Functional morphology of the mouthparts and associated structures of Pagurus rubricatus (Crustacea: Decapoda: Anomura) with special reference to feeding and grooming (1982)
    Springer
    Zoomorphology 101 (1982), S. 17-38 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Pagurus rubricatus is predatory, detrivorous, macrophagous, and to a small degree, a suspension feeder. The crab searches for small invertebrates by digging shallow pits in the sediment. During this process it feeds on detritus obtained either directly from the sediment or scoured off gravel granules. Particles trapped by the dense setation of the 2nd and 3rd maxillipeds are brushed off and ingested. The distribution of the various types of setae on the mouthparts is mapped and structure of the mouthparts and their setae is correlated with function. Sediment collected by the pereiopods is brushed off by the endopodites of the 3rd maxillipeds and transferred to the inner mouthparts by the endopodites of the 2nd maxillipeds. The basipodites of the 1st maxillae form a filter screen through which particles of suitable size are pushed by the 2nd maxillae. Rejected particles are discarded by the exhalant stream via the currents generated by the exopodites of the maxillipeds. Specialized setae on the 2nd maxillae scour detritus from the surface of gravel granules applied to these appendages by the 2nd and 3rd maxillipeds. Interlocking setae from different appendages form a number of screens the main function of which is to retain material in the buccal region. The exopodite and endopodite of the 1st maxilliped and the endopodites of the 1st and 2nd maxillipeds form a channel which funnels the exhalant respiratory current away from the crab. The main grooming appendages are the endopodites of the 3rd maxillipeds, however, most of the other mouthparts have a self-cleaning function.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312028
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 90
    Digitale Medien
    Digitale Medien
    Ultrastructure of copulatory organs in Turbellaria (1982)
    Springer
    Zoomorphology 101 (1982), S. 39-59 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The copulatory organs in Macrostomum sp. and Microstomum sp. contain simple tubular stylets which are intracellular specializations. The stylet in Macrostomum sp. is produced in a syncytium covering part of the prostatic vesicle. The proximal region of the stylet surrounds the vesicle which contains six prostatic gland ducts and six accessory (sensory) cells containing ciliary rootlets. The stylet in Microstomum sp. is produced in an extension of a syncytium which lines the combined seminal-prostatic vesicle. The stylet is connected to the combined vesicle by a narrow bridge of matrix syncytium through which sperm, prostatic gland products and sensory cilia pass from the vesicle to the stylet lumen. In both species the matrix syncytium can be interpreted as a specialized terminal end of the male canal epithelium. Stylets of Turbellaria and other lower Metazoa are discussed in regards to structure (one or several pieces) and location (in separate cells, in a syncytium, or extracellular).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312029
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 91
    Digitale Medien
    Digitale Medien
    Erectile tissue and smooth muscle in snouts of Carettochelys insculpta, Trionchids and other chelonia (1982)
    Springer
    Zoomorphology 101 (1982), S. 83-93 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Four families of chelonians, the Carettochelyidae, Trionchidae, Pelomedusidae and Chelidae, possess nasal erectile tissue and masses of smooth muscle within the snout. These specialized tissues appear to control the internal diameter of the narial passage. Two of these families, the carettochelids and trionchilds, can change the angle of the tubular snout relative to the head. The trionchids have numerous pharyngeal papillae that function as respiratory surfaces. The angle of the snout and its internal diameter are important to these animals in utilizing the snout to draw clear water into the buccal cavity while buried in the substrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312016
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 92
    Digitale Medien
    Digitale Medien
    Ultrastruktur-Untersuchungen zur Eischalenbildung bei Microdalyellia fairchildi (Turbellaria) (1982)
    Springer
    Zoomorphology 101 (1982), S. 61-70 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die Zellen des Uterus von Microdalyellia fairchildi, die durch ein reichlich entwickeltes ER ausgezeichnet sind, produzieren ein bläschenartiges Sekret, das am Beginn der Eibildung ausgeschieden wird. Die innere Oberfläche der Zellen bildet zahlreiche, teils verzweigte lamellenartige Auffaltungen, die wechselseitig ineinandergreifen. Nach Einfließen von Eizelle und Dotterzellen in den Uterus verstreichen die Auffaltungen zu einer glatten inneren Begrenzung des Lumens. Anschließend werden zahlreiche Schalentropfen aus den Vesikeln der Dotterzellen freigesetzt. Sie fließen an der dünnen Sekretschicht der Uteruszellen, die die Innenseite des Uterus bedeckt, zu einer Eihülle ineinander. Bei geringen Mengen Uterussekret entsteht keine geschlossen einheitliche Schicht. Aus der anfänglich dünnen Eihülle geht durch Aufnahme weiterer Schalentropfen und anschließende Sklerotisierung die braune Eikapsel hervor.
    Notizen: Summary The uterus cells of Microdalyellia fairchildi which are rich in agranular ER produce a vesicular substance released from the cells at the beginning of egg-shell formation. The lumenal border of the cells is thrown into lamellae like and partly branched outfoldings which inter-digitate. After filling of the uterus with the oocyte and several vitelline cells the outfoldings are stretched to form a smooth inner wall. A plenty of shell droplets are set free by the vitelline cells. The droplets accumulate at the inner surface of the uterus and coalesce along a thin layer of uterus secretion. Lower amounts of uterus secretion do not achieve a uniform inner lining of the uterus wall. The initially thin capsule wall is thickened by fusing with further shell droplets and subsequently becomes resistent by sclerotization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312030
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 93
    Digitale Medien
    Digitale Medien
    Heart ultrastructure in Branchinecta paludosa, Artemia salina, Branchipus schaefferi, and Streptocephalus sp. (Crustacea, Anostraca) (1982)
    Springer
    Zoomorphology 101 (1982), S. 71-81 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The heart ultrastructure of the anostracan Crustacea Branchinecta paludosa, Artemia salina, Branchipus schaefferi, and Streptocephalus sp. is essentially similar. All lack an endocardium and an epicardium, and the heart wall consists of a single layered myocardium. Only in the posterior end of the heart does the myocardium form a tube. In the remaining, anterior part of the heart, the myocardium forms a trough. The dorsal edges of this trough are firmly attached to the basement membrane of the epidermis, which thus forms the lid of the trough. The Z-bands of the sarcomere are diffuse, and H- and M-bands were not seen. Interior couplings are as a rule found at Z-levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00312015
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 94
    Digitale Medien
    Digitale Medien
    Das duftorgan von apis mellifica und ähnliche hautdrüsenorgane sozialer und solitärer apiden (1925)
    Springer
    Zoomorphology 3 (1925), S. 1-80 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00407617
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 95
    Digitale Medien
    Digitale Medien
    Berichtigung (1925)
    Springer
    Zoomorphology 3 (1925), S. 476-476 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408152
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 96
    Digitale Medien
    Digitale Medien
    Die turbellarien als träger von giften (1925)
    Springer
    Zoomorphology 3 (1925), S. 344-357 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung 1. Die bisherigen Angaben über Giftwirkungen der Strudelwürmer — im Eingang zusammengestellt — beziehen sick teils auf Wirkungen bei der Aufnahme von Turbellarien per os, teils auf Giftorgane und Giftsecrete, die den Turbellarien als Schutzmittel und zum Nahrungserwerb dienen sollen. 2. Wir konnten zeigen, daß Auszüge von Paludicolen mit physiologischer Kochsalzlösung Warmblütern — Meerschweinchen, Kaninchen und weißen Mäusen — parenteral (intracardial und intraperitoneal) zugeführt, eine Giftwirkung entfalten, genügend, um bei entsprechender Dosierung den Tod der Versuchstiere herbeizuführen. 3. Als giftig in diesem Sinne erwiesen sich alle von uns geprüften Tricladen (Dendrocoelum lacteum, Polycelis nigra und cornuta, Planaria gonocephala und lugubris, Bdellocephala punctata). 4. Als geringste tödliche Menge Tricladenbreies (mit der dreifachen Menge 0,85%iger NaCl-Lüsung 1/2 Stunde extrahiert, intracardiale Injektion), auf 100 g Meerschwein berechnet, erwies sick in unseren Versuchen von Dendrocoelum lacteum 0,15 g, von Polycelis nigra 0,14 g, von Planaria lugubris 0,18 g, von Pl. gonocepluala 0,08 g. 5. Über Art und Sitz des Giftes im Tricladenkörper sowie seine Angriffsweise im Warmblüterorganismus läßt sich noch niehts Näheres sagen. 6. Per os eingefiihrte Tricladen bewirkten weder bei Selbstversuchen noch bei Fütterungsversuchen mit Meerschweinchen und Molchen Schädigungen, obwohl das ablehnende Verhalten der Molche bei Tricladenfütterung auch in diesen Versuchen deutlich hervortrat.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408147
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 97
    Digitale Medien
    Digitale Medien
    Schuppenentwicklung und pigmentbildung auf den flügeln von lymantria dispar unter besonderer berücksichtigung des sexuellen dimorphismus (1925)
    Springer
    Zoomorphology 3 (1925), S. 477-525 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408188
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 98
    Digitale Medien
    Digitale Medien
    Neue sexualbiologische spinnenstudien (1925)
    Springer
    Zoomorphology 3 (1925), S. 567-618 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00408191
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 99
    Digitale Medien
    Digitale Medien
    Endemisches vorkommen einer Mediterranen Zecke (Dermacentor reticulatus F.) in Deutschland (1925)
    Springer
    Zoomorphology 3 (1925), S. 704-705 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00443878
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 100
    Digitale Medien
    Digitale Medien
    Die trichterrolle des ahornblattrollers. Biologisches und taxonomisches über einen sehr bemerkenswerten rüsselkäfer (1925)
    Springer
    Zoomorphology 3 (1925), S. 685-703 
    Details
    ISSN: 1432-234X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Zusammenfassung Bei den Rüsselkäfern aus der Unterfamilie der Rhynchitinae ist die Brutpflege durch Herstellung komplizierter Blattrollen verbreitet. Es ist möglich, die Typen dieser Blattrollung mit der systematischen Gliederung in Einklang zu bringen. Fußend darauf läßt sich die systematische Gliederung auf Grund der Biologie ausbauen. Der Gang der Überlegungen beweist, daß biologische Charaktere als Grundlage für eine systematische Gliederung durchaus geeignet sind. Der Aufbau der Blattrolle einer selteneren heimischen Art wird analysiert und als prinzipiell abweichend von den bisher bekannten Blattrollen der Rhynchitinen erwiesen. Auf Grund der Blattrollenform läßt sich eine neue Gattung Chonostropheus g. n. errichten, deren Vertreter auch morphologisch charakterisiert sind; als typischer Vertreter dieser Gattung hat der einheimische Ahornblattroller Ch. tristis (F.) zu gelten.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00443877
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...