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  • 1
    Electronic Resource
    Electronic Resource
    Influence of the enteric surface coat on the unidirectional flux of acetamide across the wall of rat small intestine (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 149-151 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In vivo treatment of the jejunal mucosa with glycosidic enzymes seems to remove the enteric surface coat of the enterocyte. As a consequence, the mucosa-to-serosa unidirectional flux of acetamide increases remarkably. The glycocalyx probably represents a barrier to the diffusion of small hydrosoluble solutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01958867
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  • 2
    Electronic Resource
    Electronic Resource
    Rat jejunal basolateral membrane Cl/HCO3 exchanger is modulated by a Na-sensitive modifier site (1994)
    Springer
    The journal of membrane biology 138 (1994), S. 47-53 
    Details
    ISSN: 1432-1424
    Keywords: Rat jejunum ; Basolateral membrane vesicles ; Cl/HCO3 exchange ; Na effect ; Allosteric modifier site
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A Cl/HCO3 exchanger mediates HCO3 extrusion across rat jejunal basolateral membrane. Previous studies demonstrated that anion antiport activity is positively affected by Na, but evidence was given that this cation is not translocated by the carrier protein. Basolateral membranes isolated from rat jejunum were used to give more insight on Na effect. Uptake studies, performed together with vesicle sidedness determinations, indicated that the greatest stimulation of Cl-dependent HCO3 uptake occurs when Na is present at both vesicle surfaces. The kinetic dependence of Cl/HCO3 exchange on equal intra- and extravesicular Na concentration showed a hyperbolic relationship, and the calculated kinetic parameters were V max=0.153 ± 0.006 nmol mg protein-1 sec-1, K m =23.0 Mm. Ion replacement studies indicated that Na can be partially substituted only by Li and not by other monovalent cations. Results of this study suggest that Na could act as a nonessential activator of the Cl/HCO3 exchanger. A possible role of the Na-sensitive modifier site in the physiology of jejunal enterocyte is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211068
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fine structure of the etioplast in two mutants of maize
    Amsterdam : Elsevier
    Journal of Ultrasructure Research 55 (1976), S. 42-49 
    Details
    ISSN: 0022-5320
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0022-5320(76)80080-9
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Prolamellar body transformation with increasing cell age in the maize leaf (1976)
    Springer
    Protoplasma 90 (1976), S. 253-263 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The fine structure of the plastids in the leaf's basal meristem and in the leaf tissues 2 cm immediately above has been studied in maize leaves of different ages. In the young leaves the proplastids of the basal meristem differentiate, in the tissues within 2 cm above the meristem, into chloroplasts containing two or more prolamellar bodies, indipendently whether the tissues have been fixed 11 hours after a period of illumination or of darkness. In the oldest leaves, in the tissues immediately above the basal meristem, no prolamellar body is present in the plastids, and the proplastids differentiate directly into chloroplasts, without passing through an “etio-chloroplast” stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01275678
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  • 5
    Electronic Resource
    Electronic Resource
    Further measurements on the bioluminescence of the seedlings (1955)
    Springer
    Cellular and molecular life sciences 11 (1955), S. 479-481 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Riassunto Alcuni di noi recentemente hanno messo in evidenza un 'emissione di luce di debole intensità nello spettro visibile, da parte di semi in germinazione. E argomento del presente lavoro discutere alcune accurate misure di intensità luminosa condotte su semi germinanti e su loro estratti acquosi in varie condizioni di età della plantule da 1 a 20 giorni. Viene anche studiata la dipendenza dell'emissione luminosa dal pH della soluzione e viene indicata la distribuzione spettrale della luce emessa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166829
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  • 6
    Electronic Resource
    Electronic Resource
    Bicarbonate movement across basolateral membrane vesicles from rat jejunum (1984)
    Springer
    Pflügers Archiv 401 (1984), S. 427-429 
    Details
    ISSN: 1432-2013
    Keywords: Rat jejunal enterocyte ; Basolateral membrane vesicles ; Bicarbonate transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The self-orienting Percoll-gradient centrifugation was used to separate basolateral membranes (BLMs) from rat jejunal enterocytes. Bicarbonate uptake into osmotically active BLM vesicles was studied by a rapid filtration technique. The time course of [14C]-labelled bicarbonate uptake was followed for 30 min at 18° C and at pH 8.2. Bicarbonate uptake was fast, not saturable and stimulated by countertransport. This work demonstrates that it is possible to determine bicarbonate flux across BLM vesicles at pH and temperature values close to usual experimental conditions. Together with simple diffusion, bicarbonate would cross the BLM of the enterocyte via a carrier-mediated diffusion process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00584349
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  • 7
    Electronic Resource
    Electronic Resource
    Bicarbonate and chloride transport across rat ileal basolateral membrane (1995)
    Springer
    Cellular and molecular life sciences 51 (1995), S. 799-803 
    Details
    ISSN: 1420-9071
    Keywords: Rat ileum ; basolateral membrane vesicles ; bicarbonate and chloride transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The mechanisms of HCO 3 − and Cl− transport across basolateral membranes from rat ileum were investigated in isolated vesicles by means of uptake experiments. Neither Cl−/HCO 3 − exchanger nor Na+−(HCO 3 − )n cotransport seem to be present in ileal basolateral membranes. Moreover Cl− uptake is unaffected bycis Na+ and/or K+ gradients, indicating the absence of Na+−Cl−, K+−Cl− and Na+−K+−2Cl− symport activity. An electrically conductive pathway seems to be responsible for both HCO 3 − and Cl− fluxes. Evidence is also given for the presence of a Na+/H+ exchanger at the basolateral pole of ileal enterocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922433
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  • 8
    Electronic Resource
    Electronic Resource
    Cl−/HCO 3 − exchanger is operative in isolated enterocytes from rat jejunum (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 245-248 
    Details
    ISSN: 1420-9071
    Keywords: Rat jejunum ; isolated enterocytes ; Cl−/HCO 3 − exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Enterocytes isolated from rat jejunum were tested for the existence of a Cl−/HCO 3 − exchange, previously evidenced in basolateral membrane vesicles but not in brush border. Cells were found to retain functional integrity and transport capabilities long enough to allow Cl− fluxes to be measured. Both efflux and uptake experiments indicate that a Cl−/HCO 3 − antiport, inhibited by 4,4′-diisothiocyanostilbene-2-2′-disulfonic acid (DIDS), is functional under resting conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920716
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The ultrastructural development of plastids in leaves of maize plants exposed to continuous illumination (1980)
    Springer
    Protoplasma 102 (1980), S. 131-139 
    Details
    ISSN: 1615-6102
    Keywords: Chloroplast ontogenesis ; Prolamellar body ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Chloroplast differentiation in relation to increasing leaf age has been investigated in maize plants exposed to continuous illumination. In the young leaves the proplastids differentiate into chloroplasts containing well organized grana as well as prolamellar bodies. In the older leaves, while plastids differentiate, the prolamellar bodies are no longer detectable. Chloroplast ability to build up prolamellar bodies does not seems so much a light dependent process as it is affected by cell differentiation rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276953
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  • 10
    Electronic Resource
    Electronic Resource
    Ultrastructural study of an olive necrotic mutant of maize (1981)
    Springer
    Protoplasma 105 (1981), S. 241-249 
    Details
    ISSN: 1615-6102
    Keywords: Olive necrotic mutants ; Plastid aberrations ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ultrastructural surveys, carried out into an olive necrotic maize mutant (Neuffer E 283 B) grown under a 16 hours photoperiod, have shown remarkable morphological alterations in the plastids. Such alterations, affecting both the mesophyll and the bundle sheath plastids, appear to be photodependent. Quite normal etioplasts are present in dark-grown mutant seedlings. Moreover, light appears also to inhibit the overall growth of mutant plants. 12-day-old mutant plants grown under illumination are 4 cm in comparison with the 10 cm of the wild type, while corresponding dark-grown seedlings of both types are 12 cm high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279222
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