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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The journal of membrane biology 28 (1976), S. 207-239 
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Electronmicroscopic study of electrically coupled smooth muscles was undertaken to determine the distribution of nexuses in various types of smooth muscle. The study revealed that while nexal structures were commonplace in some types of smooth muscle, they were very rare or absent in others, even though in some cases these cells were only a few nanometers distant from one another. The persistence in thin section of these structures in the main circular muscle of dog intestine after poor fixation, fixation under strain, cell shrinkage, and metabolic damage of various sorts seems to rule out the thesis that they are labile. The absence of nexuses in longitudinal muscle of dog intestine examined both by thin section and by freeze fracture suggests that in this tissue they are absent or very rarein vivo and cannot account for electrical coupling. Nexuses were discernible in thin sections of main circular muscle after a variety of experimental conditions of fixation. Metabolic inhibition orin vitro permanganate fixation partially destroyed nexal contacts. These procedures induced tissue, membrane apposition and an accompanying increase in the number of structures which resemble nexuses at low magnification (nexus-like structures). “Nexus-like” structures occurred in all smooth muscle fixed byin vitro permanganate associated with apposition of membranes and poor preservation of basement membrane. A technique ofin vitro permanganate fixation was developed which prevented tissue swelling; consequently “nexus-like” structures were absent in tissues so treated. The suggestion is made that some structures described in the literature as nexuses, following permanganate fixation, may represent “nexus-like” structures. The balance of evidence suggests that nexuses need not be present for electrical coupling of some smooth muscle cells, in which other types of cell-to-cell contacts must be invoked.
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 611-612 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Veronal is a weak acid (diethylbarbituric) with a dissociation constant of approximately 10~8 (ref. 2); and Michaelis5 introduced its sodium salt as a buffer for use between pH. 7 and 9. Sodium acetate is effective in buffers on the acid side of neutrality (see refs. 4 and 6; Fig. 1). Michaelis2 ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 176 (1955), S. 886-887 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Schistocerca gregaria Forsk. The Golgi bodies (lipochondria of Shafiq) of the living neurones of this locust, when examined under the phase-contrast microscope, show a highly refractile dark cortex and an almost colourless medulla. Besides, there are smaller, highly refract ile, homogeneous Golgi ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 520-521 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Light micrograph of 8.5-day-old trophoblast growing in the spleen to show the apparent cytoplasmic continuity between three adjacent cells In the present series of investigations the trophoblast was obtained by transplanting either the unimplanted 3.5-day-old uterine blastocyst, or the ...
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 436 (1984), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Materials and structures 23 (1990), S. 252-255 
    ISSN: 1359-5997
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Description / Table of Contents: Résumé La boue rouge est un déchet de l’extraction d’aluminium: il s’agit principalement d’oxydes d’aluminium, de fer et de titanium. La production actuelle de boue rouge dépasse en Inde 2 millions de tonnes chaque année qui ne sont employées à aucun usage valable excepté, en quantité limitée, comme filler dans la préparation des routes. On a tenté au Central Building Research Institute de produire des briques d’argile cuites en remplaçant partiellement l’argile par de la boue et des cendres volantes. Cette fabrication de boue rouge est appelée rapidement à une utilisation importante. On a également essayé d’incorporer dans la boue rouge un faible pourcentage de chaux et de compresser le mélange sous forme de briques à une teneur en humidité optimale dans le but d’examiner leur résistance et leur stabilité à l’action érosive de l’eau. On a obtenu à 28 jours de moulage et de conservation en atmosphère humide (mois d’août) une résistance à la compression en humidité maximale de 3,75 MN m−2 avec 5% de chaux et de 4,22MN m−2 avec 8% de chaux. Les échantillons de boue rouge examinés provenaient de la Société Indienne d’Aluminium (Indalco). On a soumis les échantillons de brique à un vieillissement accéléré, et on a trouvé qu’ils convenaient comme éléments de maçonnerie pour habitations à faible coût. En même temps, on a examiné les modifications qui interviennent dans le mélange de boue rouge, en particulier du point de vue de la distribution dimensionnelle des pores, quand on le remplace partiellement par de la terre grossière et des cendres volantes. Les résultats montrent que l’action bénéfique de la chaux sur la boue rouge est surtout d’ordre chimique.
    Notes: Abstract Red mud is a waste material obtained from the aluminium extraction industry and consists mainly of the oxides of aluminium, iron and titianium. The present red mud production in the country is above two million tons every year, which is not being put to any worthwhile use except as a filler to a small extent in the preparation of roads. Efforts have been made at CBRI to produce burnt clay bricks by partially replacing the clay with red mud and fly-ash. In this process, the red mud is expected to find a major use shortly. Efforts have also been made to incorporate in the red mud a small percentage of lime and compress the mix at optimum moisture content in the form of bricks with a purpose of examining their strength and stability to the erosive action of water. A maximum wet compressive strength of 3.75 MN m−2 with 5% lime and 4.22 MN m−2 with 8% lime has been obtained after 28 days of casting and humid curing in the month of August. The red mud sample studied was obtained from the Indian Aluminium Company. The brick samples were studied for accelerated weathering and found suitable for use as a walling material for low-cost shelters. Modifications in the red mud mix, especially from the viewpoint of particle size distribution, have also been examined simultaneously by its part replacement with coarse-grained soil and fly-ash. The results indicate that the basis of the beneficial action of lime on red mud is predominantly chemical.
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 1267-1268 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. This section shows parts of two mitochondria (M) and one of them contains a complex mesosome-like structure in it. Note the similarity in the density of the membranes of the mesosome-like structure and the cytoplasmic membrane (arrow). The particulate material uniformly dispersed in the ...
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 30 (1995), S. 3515-3520 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Alumina-zirconia composite powders containing 10, 12.5, 15 or 20 wt% zirconia were prepared by spray-drying the hydroxide gels. These powders were calcined at 650 and 950 °C. The spray-dried as well as the calcined powders were characterized by means of Coulter counter, Sorptometer, infrared spectroscopy (i.r.), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Initially the spray-dried powders are amorphous and spherical in shape with a diameter of 6 μm and crystallize after calcination treatment at 950 °C. Sintered density of the 950 °C calcined powder compacts was higher than 650 °C calcined powder compacts. Compacts made from 650 °C treated powders retained 100% tetragonal phase after sintering irrespective of composition. Some amount of tetragonal phase is transformed into monoclinic phase in the composites containing higher amount of zirconia in the sintered compacts made from 950 °C calcined powders.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Bioscience reports 6 (1986), S. 73-80 
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A monoclonal antibody (Mab J1-31) has been produced by using human brain homogenate as immunogen in mouse. Double-label immunofluorescence microscopy on cryostat sections of human, rabbit and rat brain, reveals staining of cells that are also stained with antiserum to glial fibrillary acidic protein (GFAP, a commonly used marker protein for astrocytes). However, there is no decrease in staining due to Mab J1-31 in sections incubated in antiserum to GFAP prior to incubation with the J1-31 ascites fluid. Immunoprecipitation of aqueous and detergent extracts of brain homogenate gives a single band at 30K by SDS PAGE followed by autoradiography. Immunoelectron microscopy shows that the J1-31 antigen is associated with the cytoskeleton. Thus, the Mab J1-31 recognizes a new protein present in GFAP positive cells (astrocytes) in the brain.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Bioscience reports 5 (1985), S. 551-558 
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Ca2+ ATPase molecules in sarcoplasmic reticulum, isolated from rabbit skeletal muscl% have been induced to crystallize into two-dimensional arrays by incubating the vesicles with phospholipase A2 and dialysing against dilute Tris/HCl buffer. These crystals differ in shape and size from those produced by treatment of the sarcoplasmic reticulum vesicles with Na3VO4. However, the unit-cell dimensions of both types of crystals are similar. The differences in shape and size are presumably due to differences in the mechanisms of crystal formation induced by treatment with phospholipase and Na3VO4.
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