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  • Life and Medical Sciences  (3)
  • Convection and heat transfer  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 717-726 
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si dà una descrizione, in termini di un approccio di unoscillatore armonico, di moti in oscillazione crescente, per spinta idrostatica, cioè l'insorgenza di convezione oscillatoria in uno strato di fluido soggetto a vari vincoli termici e meccanici. Quando lo smorzamento si annulla, si definiscono i valori di soglia. Si sottolinea anche che l'oscillazione crescente è una conseguenza dell'accoppiamento sincrono delle forze che agiscono nel sistema.
    Abstract: Резюме В приближении гармонического осциллятора предлагается описание гидростатических устойчивых движений, т.е. возникновение осциияторной конвенции в слое жидкости, на который наложены различные тепловые и механические ограничения. При исчезающе малом затухании мы определяем пороговые значения. Мы также отмечаем, что устойчивость является следствием синхронной связи сил, действующих в системе.
    Notes: Summary A description of buoyancy-driven overstable motions,i.e. the onset of oscillatory convection in a fluid layer subjected to various thermal and mechanical constraints is given in terms of aharmonic-oscillator approach. At vanishing damping we define the threshold values. We also point out that overstability is a consequence of thesynchronous coupling of the forces acting in the system.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1057-1062 
    ISSN: 0392-6737
    Keywords: Hydrodynamic stability ; PACS 47.25.Qv ; Convection and heat transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si danno nuove previsioni teoriche che riguardano la sovrastabilità di fluidi viscoelastici nei termini del numero di Prandtl e del rapporto tra il rilassamento viscoelastico e i tempi di diffusione termica.
    Abstract: Резюме Предлагаются новые теоретические предсказания, касающиеся устойчивости упруговязких жидкостей. Предложенный подход основан на числе Прандтля и отношении времени упруговязкой релаксации к времени термодиффузии.
    Notes: Summary New theoretical predictions concerning overstability of viscoelastic fluids are given in terms of the Prandtl number and the ratio of viscoelastic relaxation to thermal diffusion times.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0003-276X
    Keywords: Chick thymus ; Thymic microenvironment ; Monoclonal antibodies ; Thymic epithelium ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The process of T-lymphocyte differentiation within the thymus involves a series of molecular interactions. In this work we have carried out an analysis of the chick thymus microenvironment in order to evaluate its heterogeneity during development. We have produced 11 monoclonal antibodies whose staining patterns detected by the immunoperoxidase technique allowed us to divide them into five groups. A first group (E19-E2, P0-E5, and P15-T1) binds to thymic medullary stroma showing a reticular pattern on medullary epithelial cells and whose significance would be related to thymic stromal secretion. The second group of monoclonal antibodies (P15-T3) stains thymic corpuscles of 10- and 15-day chicks. The third group of antibodies includes P0-E1, P0-E3, P5-A6, and P15-T2 whose staining pattern is both medullary and cortical. The fourth group (P10-HB1 and P10-HB2) binds to thymic stromal and cortical thymocytes, and the fifth group (P5-A1) is characterized by the staining of medullary vessels of 5-day chicks. These five groups of monoclonal antibodies corroborate the existence of an antigenic diversity of the chick thymus microenvironment. Their possible relationships with T-cell differentiation and stromal-thymocyte interactions are discussed. © 1993 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 219 (1987), S. 296-303 
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: We have analyzed the effects of colchicine on the cell shapes in chick neuroepithelium. Cell shapes were ascertained by the position of the nucleus in plastic serial sections. We tested three colchicine doses (5 × 10-5 M, 5 × 10-6 M, and 5 × 10-7 M) by two experimental treatments (in ovo and in vitro). Colchicine treatment in vitro is always effective in depolymerizing microtubules of neuroepithelial cells and reduces the percentages of wedge-shaped cells in the median area of neuroepithelium. The same effect can be observed when the embryos are treated with 5 × 10-5 M or 5 × 10-6 M colchicine in ovo. A concentration of colchicine of 5 × 10-7 M in ovo cannot disrupt microtubules in stage 8 and stage 10 embryos, and the percentage of wedge-shaped cells is the same as that of the untreated cells. In stage 6 embryos this colchicine dose effects the microtubules and the percentages of wedge-shaped cells. These facts are interpreted in respect to variations in microtubular resistance to microtubular-disrupting agents that are shown by the neuroepithelial cells from different developmental stages.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 240 (1994), S. 537-544 
    ISSN: 0003-276X
    Keywords: Lectins ; Sheep ; Preimplantation embryo ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background: Preimplantation development of mammalia is characterized by cell surface changes functioning in intercellular communication and adhesion. The glycoconjugate role in cellular interactions has been analysed for several groups but not in sheep embryos. The binding patterns of eleven lectins during sheep preimplanatation development were investigated and the role of glycoconjugates in early development was discussed.Methods: Ultrathin sections from preimplantation ovine embryos (3-7 days) were incubated with different colloidal gold conjugated lectins and the frequency of gold particles on the cell membrane, some organelles, and the zona pellucida was evaluated.Results and Conclusions: We observed a higher staining of WGA, DBA, and SBA lectins in the intercellular contact zone with respect to the free cell surface of blastomeres during cleavage. This indicates that the N-acetyl galactosamine and N-acetyl glucosamine residues may be involved in sheep morula compaction. In contrast, the trophoblast cell displays an increase of staining of some lectins previously identified during cleavage (LcH, WGA, SBA, MPA, and PNA) on the free membrane, and a lack of sugar residues in the intercellular surface. This polarization of the trophoblast cell surface is not observed in the inner cell mass and could provide a mechanism for differentiation within the blastocyst. Intracytoplasmic vesicles show a cytochemical identity with lysosomes in the blastocyst (abundant GlcNAc and Man/Glc residues) that may reflect a functional relationship between both organelles in an intracellular cycle. The zona pellucida presents abundant GalNAc, GlcNAc, and Gal residues during preimplantation ovine development. © 1994 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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