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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 377-379 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The degradation of selectivity doped Al0.35Ga0.65As/GaAs heterostructures caused by rapid thermal annealing (RTA) was studied. The samples were annealed for 30 s at temperatures between 600 °C and 850 °C. Thereafter, the samples were characterized by Hall measurements at room temperature. Conventional heterostructures with a random alloy Al0.35Ga0.65As spacer and donor layer show a strong degradation for annealing temperatures of 650 °C or higher. For heterostructures employing a stoichiometric equivalent short period superlattice (SPS) in spacer and donor region only a slight degradation was found for annealing temperatures up to 850 °C. As reason for the increased thermal stability, the suppression of As loss during the annealing by the SPS was identified. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-203X
    Keywords: Solasodine ; Solanum eleagnifolium ; Calli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of auxins, light and cellular production ofSolanum eleagnifolium Cav. calli were studied. 2,4-dichlorophenoxyacetic acid (4.5 μM) was the plant growth regulator used for calli initiation and this produced the highest solasodine concentration. The solasodine concentration in darkness was significantly lower than that achieved under a photoperiod of 16 h. Differentiated tissue obtained by adequate hormonal balance (several ratios of 3-indolebutyric acid to 6-benzylaminopurine) produced higher yields of solasodine than non-differentiated tissue. 3-indolebutyric acid (2.5 μM) and 6-benzylaminopurine (8.8 μM) increased the productivity of solasodine by 100%.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0584
    Keywords: Allogeneic bone marrow transplantation ; Autologous bone marrow transplantation ; Granulocyte colony-stimulating factor (G-CSF) ; Hematopoietic recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The positive role of G-CSF in hastening the myeloid recovery of patients undergoing allogeneic bone marrow transplantation (ALLO-BMT) or autologous bone marrow transplantation (ABMT) has recently been established. Considerable knowledge about adequate doses and route of administration has been accumulated in the past few years. Nonetheless, the optimal time to start growth-factor administration remains undetermined. We have performed a stratified study according to the source of hematopoietic progenitors (ALLO-BMT or ABMT), underlying disease and its stage, and acute graft-versus-host disease (GVHD) prophylaxis regimen and randomized patients in two arms: group A, which started G-CSF on day 0 (36 patients), and group B, which started on day +7 post-BMT (39 patients). The same dose (5 Μg/kg/day) and route of administration were employed in both groups. We found no significant differences in the time to reach an absolute neutrophil count (ANC) of 0.1, 0.5, and 1×109/l and 50×109 platelets/l (medians: 10 and 11, 14.5 and 14, 17 and 16, 23 and 24 days, respectively, in groups A and B). We did not find differences in the days of fever or days on antibiotic treatment with less than 1×109/l ANC, rate of bacteriemia, or days of hospitalization in both groups. In contrast, a considerable saving of GCSF in B group was found (mean days of infusion in group A, 18, versus 11 in group B) (p〈0.0001). This is equivalent to a saving of 1120 $US per patient. Therefore, early use of G-CSF after BMT is useless and more expensive and provides no advantage over delayed administration.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0584
    Keywords: Key words Allogeneic bone marrow transplantation ; Autologous bone marrow transplantation ; Granulocyte colony-stimulating factor (G-CSF) ; Hematopoietic recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The positive role of G-CSF in hastening the myeloid recovery of patients undergoing allogeneic bone marrow transplantation (ALLO-BMT) or autologous bone marrow transplantation (ABMT) has recently been established. Considerable knowledge about adequate doses and route of administration has been accumulated in the past few years. Nonetheless, the optimal time to start growth-factor administration remains undetermined. We have performed a stratified study according to the source of hematopoietic progenitors (ALLO-BMT or ABMT), underlying disease and its stage, and acute graft-versus-host disease (GVHD) prophylaxis regimen and randomized patients in two arms: group A, which started G-CSF on day 0 (36 patients), and group B, which started on day +7 post-BMT (39 patients). The same dose (5 μg/kg/day) and route of administration were employed in both groups. We found no significant differences in the time to reach an absolute neutrophil count (ANC) of 0.1, 0.5, and 1×109/l and 50×109 platelets/l (medians: 10 and 11, 14.5 and 14, 17 and 16, 23 and 24 days, respectively, in groups A and B). We did not find differences in the days of fever or days on antibiotic treatment with less than 1×109/l ANC, rate of bacteriemia, or days of hospitalization in both groups. In contrast, a considerable saving of G-CSF in B group was found (mean days of infusion in group A, 18, versus 11 in group B) (p〈0.0001). This is equivalent to a saving of 1120 $US per patient. Therefore, early use of G-CSF after BMT is useless and more expensive and provides no advantage over delayed administration.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-5036
    Keywords: Azospirillum ; Establishment in roots ; Inoculation ; N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four field experiments were carried out with wheat or sorghum in different regions of Brazil. The aim was to study the establishment of inoculatedAzospirillum strains, marked with resistance to various antibiotics, in the rhizosphere and in roots. The levels of the various antibiotics were chosen according to the resistance of the indigenousAzospirillum population.Azospirillum brasilense strains Sp 107 and Sp 245 could be established in all three wheat experiments and predominated within theAzospirillum population in washed, and especially in surface sterilized, roots. Strains Sp 7 and Cd established poorly in wheat roots.Azospirillum lipoferum Sp S82 represented 72% of the root isolates from sorghum inoculated with this strain. This strain and naturalAzospirillum infection became concentrated in the upper parts of the root system. Improved methods for root surface sterilization in which the absence ofAzospirillum on the root surface was established by pre-incubating roots with paraffin-capped ends in NFb medium confirmed the establishment of inoculatedAzospirillum strains within sorghum roots in the field.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-5044
    Keywords: solasodine ; Solanum eleagnifolium Cav. ; batch suspension culture ; carbon source ; nitrogen source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of inoculum size, carbon sources (fructose, glucose, maltose, sucrose), nitrate and ammonia on solasodine production by Solanum eleagnifolium Cav. was studied. The specific growth rate was estimated to be 0.15–0.20 d-1 with all sugars tested at a concentration of 90 mM. Sucrose (180 mM) produced the highest biomass value (about 2.8 mg DW ml-1) while the lowest one was produced by maltose. Although solasodine productivity values after 11 days of culture were similar for all sugars tested, the maximum values of productivity (0.9 mg g-1 d-1) were achieved after 6 days of culture with sucrose (180 mM). Solasodine productivity of cultures conducted with a large inoculum (20% w/v fresh material) was double that with a small inoculum (10% w/v fresh material).
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1617-4623
    Keywords: Key words SalI ; Restriction-modification system ; Promoter ; Heterologous gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The salIR and salIM genes encode the endonuclease and methyltransferase components of the SalI restriction-modification system from Streptomyces albus G. Expression of the salI genes in Escherichia coli was investigated and major differences with Streptomyces were found. In E. coli there is no detectable expression of the salIR gene due to inactivity of the sal-pR promoter region. In the natural host of the system this region directs transcription of the salI genes as a bicistronic message. In contrast to salIR, salIM is transcribed in the heterologous host from a promoter within the salI DNA. Since sal-pR is not active, the gene cannot be expressed as part of the salI operon. It is probably transcribed from sal-pM, a promoter internal to the operon which allows independent expression of the modification gene in Streptomyces. Replacement of sal-pR by the strong pLac promoter allows expression of salIR in E. coli and enhances expression of salIM. The resulting strain produces about 10 times more endonuclease than a Streptomyces clone containing the SalI system under the control of sal-pR.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Transformed organ cultures of Solanum eleagnifolium Cav. (roots and shoots) were obtained by infection with different Agrobacterium species (A. rhizogenes and A. tumefaciens). The growth index and the solasodine productivity of both kinds of cultures were determinated for several clones. Transformed roots (clone 5) shows a Growth Index of 39.07 and a solasodine yield of 1.90 ± 0.08 mg g-1DW . Solasodine content in clone 5 of transformed roots (1.9 ± 0.08 mg g-1 DW) is similar to those obtained by hormonal manipulation (1.00 – 1.68 mg g-1DW) but higher than those found in shoots and leaves of the wild-grown plant (0.3–0.4 mg g-1DW).
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