ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • Cell & Developmental Biology  (3)
  • Blastomere  (1)
  • Chemical Engineering  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Characterization of the dipnoi, a monophyletic group (1986)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 190 (1986), S. 25-37 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fossil and extant dipnoans form a well-defined group of osteichthyans. Tooth plates, a feature in common for extant and the majority of fossil dipnoans, are not found in all dipnoans. Nevertheless primitive dipnoans can be defined by 21 characters of the head skeleton: bone arrangement in the posterior part of the skull roof, relation between supraorbital sensory line and bones, five extrascapulars, ossified (soft in post-Devonian dipnoans) upper lip, lack of premaxilla and maxilla, number and arrangement of bones in cheek region, lack of coronoids, the presence of an adsymphysial plate, ossified (soft in post-Devonian dipnoans) lower lip, relationship of oral and mandibular sensory canal to “infradentaries,” course of neurovascular system in lower jaw, symphysial tubuli in lower jaw, gular-shaped submandibulars, anterior naris at the edge and posterior naris within the mouth, median contact of pterygoids back to jaw articulation, posterior position of parasphenoid (buccohypophysial foramen very anterior in parasphenoid), unpaired “vomer,” autostyly, neurocranial support of posterior dermal skull roof, no isolated hypobranchials, and pharyngobranchials reduced or lacking. These 21 features distinguish the dipnoans from all other sarcopterygians. The Lower Devonian genus Diabolepis, which is said by some authors to have a closer relationship to dipnoans than to any other sarcopterygian, is considered to be inadequately known at present for definite statements about its relationship.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051900406
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Paleozoic lungfishes - a review (1986)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 190 (1986), S. 93-131 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Stratigraphical and paleoecological evidence indicates that lungfishes evolved in shallow marine conditions. Devonian genera had large gill chambers, and the details of bony supports of the gill arches of the Late Devonian Griphognathus whitei demonstrate that the arches were all functional. These data, together with an analysis of the body forms of the Devonian genera, indicate that they were dependent on gill (and possibly skin) respiration. The oldest known dipnoans, Uranolophus and Speonesydrion, are held to be representative to two lineages that can be recognized by their buccal and branchial features. One had a “rasping” dentition formed of denticles and marginal ridges that were continually shed and remodelled; the other had a “crushing” dentition characterized by the presence of variously modelled dentine masses that continued growth throughout the life of the animal. A list of buccal and branchial characters associated with these modes of feeding is presented. Because the relations of the Dipnoi have to be examined in terms of the features possessed by the group when it first appeared as a separate entity, the final part of the paper makes an attempt to define the primitive dipnoan morphotype. It is shown that many features taken to be diagnostic of the Dipnoi by some workers were not present in its early members; failure to recognize this fact has led to erroneous hypotheses about dipnoan-amphibian relations.
    Additional Material: 23 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051900409
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Predictions of nucleation theory applied to ehrenfest thermodynamic transitions: II. The effects of pressure and stress (1985)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 25 (1985), S. 1097-1102 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This paper is a sequel to an earlier one on the applicability of classical nucleation theory to second-order transitions in the Ehrenfest sense (1). In each case the approach was to obtain the critical size rc and energy barrier ΔGc for the growth of a nucleus of β-phase in an α-phase matrix by a Maclaurin series expansion of the free-energy-density g = (Gβ - Gα)/vβ as a function of θ (in BC-I) and of ΔP and Δσ in this paper where θ = (T - Tt) is the degree of undercooling and ΔP and Δσ are analogous terms for the hydrostatic pressure shift and tensile stress shift away from the equilibrium transition. The expansion coefficients were determined by the use of thermodynamic relationships. For second-order transitions, rc = 4γvβ Tt/ΔCpθ2, rc = 4γ/Δβ(Δp)2, and rc = 4γ/YαYβ(Δσ)2, respectively, for the three cases. The terms ΔCp, Δβ, and ΔY denote the differences in heat capacity, compressibility, and Young's modulus, e.g., ΔY = Yβ - Yα. The interfacial energy γαβ is denoted by γ. The activation energy barriers for the cases developed in this paper were ΔGc = (16π/3)γ3/(Δβ)2 (Δp)4 and ΔGc = (64π/3)γ3Yα2Yβ2/(ΔY)2(Δσ)4. More complicated expressions are given in the paper for the rc and ΔGc for first-order transitions. In the long run, these expressions may prove more useful than the ones for second-order because of the modifications expressions for the kinetics of transformations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760251709
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Transfer of nuclei from 8-cell stage mouse embryos following use of nocodazole to control the cell cycle (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 39 (1994), S. 147-152 
    Details
    ISSN: 1040-452X
    Keywords: Mitosis ; Synchronization ; Mice ; Blastomere ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Mouse 2-, 4-, 8-, and 16-cell embryos were exposed to nocodazole in M16 culture medium. The effect of different concentrations and exposure times on the efficiency of cell cycle synchronization and the development of the treated embyros after release from the drug was determined. The minimum effective concentration (95% of arrested nuclei) for 4-, 8-, and 16-cell embryos was 5μM nocodazole. The effect upon subsequent development of mouse embryos depended upon both the stage of development of the embryo at treatment (P 〈 0.001) and the length of exposure to nocodazole (P 〈 0.001). Exposure to any concentration of nocodazole within the range 2.5-10 μM for 12 hr caused a reduction in the proportion of embryos that formed blastocysts. As the period of exposure to 5μM nocodazole increased from 12 to 24 hr, the proportion of embryos developing to the blastocyst stage decreased. The lower proportion of embyros developing to the blastocyst stage and to term (P 〈 0.01) suggests that the more advanced stages were more susceptible to damage as a result of exposure to nocodazole. The rate of development of 4-cell embryos to blastocysts was not affected when an exposure time of 9 hr was used. Together these results show that it is possible to use nocodazole to arrest mouse embryonic cells in mitosis but that it is not appropriate to culture the embryos in the presence of this drug for prolonged periods. Individual blastomeres completed mitosis at 60-90 min and started DNA synthesis at 120-150 min after release from nocodazole. Nuclei from blastomeres thus synchronized were used to conduct studies on the effect of the cell cycle on nuclear transfer. A signficant effect was found. When nuclei from 8-cell embryos in G1 or S-phase were used as nuclei donors, development to blastocyst was respectively 27% and none. ©Wiley-Liss, Inc.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080390205
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...