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  • 1
    Electronic Resource
    Electronic Resource
    The Heats of Combustion and Formation of Boron Carbide (1955)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 2654-2656 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01614a100
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  • 2
    Electronic Resource
    Electronic Resource
    SELF-DIFFUSION IN MOLTEN SODIUM NITRATE1 (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 1772-1773 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01589a087
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  • 3
    Electronic Resource
    Electronic Resource
    The Low Temperature Heat Capacity and Entropy of Cadmium Iodide (1955)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 77 (1955), S. 1304-1306 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01610a073
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  • 4
    Electronic Resource
    Electronic Resource
    Low Temperature Heat Capacity and Entropy of Molybdenum Trioxide and Molybdenum Disulfide (1956)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 78 (1956), S. 1533-1536 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01589a006
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  • 5
    Electronic Resource
    Electronic Resource
    Sediment type distribution in reservoirs: sediment source versus morphometry (1999)
    Springer
    Environmental geology 38 (1999), S. 101-110 
    Details
    ISSN: 1432-0495
    Keywords: Key words Reservoir sediments ; Sediment type ; Sediment source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Bottom sediments were collected from seven Texas reservoirs to assess the spatial distribution of sediment types in reservoirs. The sediment samples were analyzed for water content, organic content, and grain-size distributions. The reservoirs are characterized by distinct water content patterns (referred to in this paper as Types I, II, and III) that reflect the lithologic units comprising their drainage area. The water content, organic content, and percent mud decreases from Type I (shale, marl) through Type II (limestone-marl-sandstone) to Type III (granite-gneiss-schist-sandstone) reservoirs. Reported elemental concentrations in the reservoir sediments are consistent with concentrations in the dominant rocks within their drainage area. While water depth accounts for part of the spatial distribution, sediment source explains the overall distribution of sediment types. Coarse-grained source rocks, multiple source rocks, and multiple tributaries which input sediment at different points contribute to an inconsistent sediment type distribution. Depending on the sediment source, sand and gravel-size sediments are present in the deeper regions of some reservoirs. This disrupts the classical morphometry (water depth, slope) controlled sediment distribution pattern (coarser sediments in shallower regions and finer sediments in deeper regions) of natural lakes. Thus, the location of tributaries and the type of sediments they carry are the dominant factors that control the sediment type distribution in reservoirs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050406
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  • 6
    Electronic Resource
    Electronic Resource
    Na+/H+ Exchanger Isoform 2 (NHE2) is Expressed in the Apical Membrane of the Medullary Thick Ascending Limb (1997)
    Springer
    The journal of membrane biology 160 (1997), S. 85-90 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. Apical Na+/H+ exchangers (NHE) in the proximal tubule and medullary thick ascending limb (MTAL) display similar functions and regulation, suggesting that similar NHE isoforms are present. In the rat proximal tubule, NHE2 and NHE3 are present in the apical membrane, however, in the MTAL, NHE3, but not NHE2, mRNA has been found. In this study, the expression and subcellular localization of NHE2 in both rat and mouse MTAL were studied. To detect NHE2 mRNA, reverse transcription-polymerase chain reaction (RT-PCR) was performed in microdissected MTAL tubules using primers specific for NHE2. Analysis of PCR products with and without digestion by restriction enzymes chosen from the published NHE2 sequence gave predicted sizes. Subcloning and sequencing of the PCR product from mouse MTAL revealed 91% and 75% identity to the published NHE2 nucleotide sequence of comparable regions in rat and rabbit, respectively. Thus, NHE2 mRNA is expressed in the MTAL of mouse and rat. The subcellular localization of NHE2 was determined by immunochemistry using a specific NHE2 antibody. Immunofluorescence staining was observed in the apical, but not basolateral, membrane of MTAL of both species. In addition, anti-NHE2 antibody recognized an 85 kD protein in plasma membranes prepared from mouse and rat renal outer medulla and a MTAL cell line by Western analysis, which further support that NHE2 protein is expressed in the MTAL of both species. We conclude that NHE2 is expressed in the apical membrane of MTAL in both mouse and rat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900297
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  • 7
    Electronic Resource
    Electronic Resource
    Expression of Na+/H+ Exchanger Isoforms in Inner Segment of Inner Medullary Collecting Duct (IMCD3) (1998)
    Springer
    The journal of membrane biology 164 (1998), S. 293-300 
    Details
    ISSN: 1432-1424
    Keywords: Key words: NHE — IMCD — IMCD3— RT-PCR — Hyperosmolality — Na+/H+ exchanger
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. Na+/H+ exchangers (NHE) play a critical role in many cellular and transport processes in the inner medullary collecting duct (IMCD). Morphologically, the IMCD is divided into the outer (IMCD1), middle (IMCD2), and inner (IMCD3) segments. The inner, IMCD3 segment contains only one cell type, the IMCD cell, which is distinct in ultrastructure and in function from the principal and intercalated cells that are present in other portions of the IMCD. NHEs constitute a gene family containing several isoforms (NHE1, NHE2, NHE3, NHE4 and NHE5) which possess distinct characteristics and serve specialized functions. To understand the molecular basis of NHE-related processes in the IMCD, it is critical to know the molecular identity of the NHEs in this tubule segment. The purpose of the present study was to identify the NHE isoforms present and their polar distribution in IMCD3. Applying the reverse transcription-polymerase chain reaction (RT-PCR) technique to IMCD3 (obtained from distal 50% of inner medulla) of mouse and rat kidneys, we found that NHE1, NHE2 and NHE4, but not NHE3 were expressed in both species. The polar localization of NHE in IMCD3 was examined in tubules isolated from rats and perfused in vitro with HEPES-buffered solutions under isotonic conditions. pHi was measured by BCECF fluorescence. Na+-dependent, amiloride-inhibitable pHi recovery from cell acidification (consistent with NHE) was detected in the basolateral, but not the apical, membrane of IMCD3. We conclude that NHE1, NHE2 and NHE4, but not NHE3, are present in both the mouse and rat IMCD3. Functionally, NHE is limited to the basolateral membrane. Additional studies are needed to determine the physiological roles and regulation of basolateral NHE isoforms in this tubule segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002329900414
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  • 8
    Electronic Resource
    Electronic Resource
    Function of Carotenoids in Photosynthetic Bacteria (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1891-1892 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The protocol for a typical experiment (Exp. 2, Fig. 1) is as follows. E. spheroides was grown photo-synthetically in a stab culture9. A small amount of growth was inoculated into a 50-ml. Florence flask filled to the neck with modified Hutner's medium9. This was incubated in the light at 30 C. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841891b0
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  • 9
    Electronic Resource
    Electronic Resource
    Generation of Campylobacter fetus S-layer protein diversity utilizes a single promoter on an invertible DNA segment (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 19 (1996), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Wild-type strains of Campylobacter fetus contain a monomolecular array of surface layer proteins (SLPs) and vary the antigenicity of the predominant SLP expressed. Reciprocal recombination events among the eight genomic SLP gene cassettes, which encode 97- to 149 kDa SLPs, permit this variation. To explore whether SLP expression utilizes a single promoter, we created mutant bacterial strains using insertional mutagenesis by rescue of a marker from plasmids. Experimental analysis of the mutants created clearly indicates that SLP expression solely utilizes the single sapA promoter, and that for variation C. fetus uses a mechanism of DNA rearrangement involving inversion of a 6.2 kb segment of DNA containing this promoter. This DNA inversion positions the sapA promoter immediately upstream of one of two oppositely oriented SLP gene cassettes, leading to its expression. Additionally, a second mechanism of DNA rearrangement occurs to replace at least one of the two SLP gene cassettes bracketing the invertible element. As previously reported promoter inversions in prokaryotes, yeasts and viruses involve alternate expression of at most two structural genes, the ability of C. fetus to use this phenomenon to express one of multiple cassettes is novel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1996.tb02469.x
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  • 10
    Electronic Resource
    Electronic Resource
    The Escherichia coli phage-shock-protein (psp) operon (1997)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 24 (1997), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The phage-shock-protein (psp) operon helps to ensure survival of Escherichia coli in late stationary phase at alkaline pH, and protects the cell against dissipation of its proton-motive force against challenge. It is strongly induced by filamentous phage pIV and its bacterial homologues, and by mutant porins that don’t localize properly, as well as by a number of other stresses. Transcription of the operon is dependent on σ54 and a constitutively active, autogenously controlled activator. psp-operon expression is controlled by one negatively and several positively acting regulators, none of which is a DNA-binding protein. The major product of the operon, PspA, may also serve as a negative regulator of an unusual porin, OmpG.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1997.3481712.x
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