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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 43 (1994), S. 337-341 
    ISSN: 0006-3592
    Keywords: yeast ; on-line ; capacitance ; viable biomass ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A commercially available biomass monitor has been employed in a number of applications. For capacitance monitors, a relationship between capacitance measurement and cell counts or colony forming units has been reported in the literature. However, for use as an online instrument, a more practical correlation with the biomass concentration is needed. In this study, we followed the batch growth of brewer's yeast and a correlation with viable biomass concentration (g DW/L) was demonstrated. This correlation was utilized with the capacitance biomass monitor in a control loop to maintain setpoint biomass levels in a cyclic reactor under perturbations. Not only did the system demonstrate the capability of the biomass monitor to control biomass in such a system, but it also confirmed the correlation reported in our earlier work. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5176
    Keywords: cyanobacteria ; bioactive compounds ; allelopathy ; calothrixin ; hapalindole ; alkaloids ; Fischerella ; Calothrix
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The alkaloids 12-epi-hapalindole E isonitrile,isolated from the cyanobacterium Fischerellasp., and the indolophenanthridine calothrixin A, fromCalothrix sp., were characterized in terms oftheir ability to kill several organisms and celltypes, and their biochemical modes of action. Bothcompounds inhibited RNA synthesis, and consequentlyprotein synthesis, in Bacillus subtilis. Calothrixin A also inhibited DNA replication, thehapalindole having little effect on this process. Measurements of in vitro RNA synthesis confirmedthe in vivo results and suggested that bothcompounds inhibit RNA polymerase directly; the degreeof inhibition was independent of the DNAconcentration, but strongly dependent on thepolymerase concentration.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1619-7089
    Keywords: Dementia with Lewy bodies ; Alzheimer's disease ; D2 receptors ; Iodine-123 iodobenzamide ; Single-photon emission tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Dementia with Lewy bodies (DLB) can at present only be diagnosed with certainty by neuropathological examination. Diagnosis during life remains at best probable, based on the presence of symptoms known from autopsy studies to be frequently associated with DLB. The greatest practical clinical problem lies in distinguishing DLB arid Alzheimer's disease (AD). In DLB there is a considerable degeneration of nigral neurones with depletion of striatal dopamine. In contrast, AD is not associated with significant changes in dopamine metabolism. Iodine-123 iodobenzamide single-photon emission tomography (IBZM-SPET) measures post-synaptic dopamine D2 neuroreceptor availability in the corpus striatum, but is nevertheless a method for assessing the integrity of the nigrostriatal dopaminergic pathway. Sixteen clinically diagnosed DLB patients, 15 normal controls arid 13 AD patients underwent IBZM-SPET. All subjects were scanned 1.5–2 h after intravenous injection of 185 MBq of123I-IBZM. Circular regions of iriterest were employed to calculate radioactivity ratios in each hemisphere as follows: caudate nucleus/frontal cortex, putamen/frontal cortex arid caudate nucleus/putamen. The DLB patients had significantly lower left caudate/putamen ratios (95% confidence intervals: DLB 0.893–0.965, AD 0.972–1.175, controls 1.031–1.168) than either controls or AD patients, and significantly lower right caudate/putamen ratios (95% confidence intervals: DLB 0.926–1.019, AD 0.954–1.103, controls 1.027–1.144) chan controls. Our data suggest that patients with DLB diagnosed by clinical criteria have changes in striatal post-synaptic D2 receptors. This may be of value in distinguishing DLB from AD during life.
    Type of Medium: Electronic Resource
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