Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1990-1994  (19)
Collection
Years
Year
  • 1
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We monitored the compositional change of host RNA polymerase in Xp 10 infected cells by one-step immunoprecipitation with core enzymespecific antiserum. Results showed a rapid loss of σ subunit from the RNA polymerase complex by 3 min after infection. In addition, some putative binding proteins were reduced to various extents. In contrast, increasing levels of several other polypeptides were detected. The de novo host protein synthesis was inhibited within 1 min after Xp 10 infection. On the other hand, a sequential expression of phage specific proteins was found and can be categorized as early, middle, and late stage. The alteration of host RNA polymerase and the shutdown of early class proteins took place in parallel.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this study the lytic cycle of a filamentous phage is reported. Under normal laboratory cultivation conditions a virulent form could spontaneously and easily arise from a temperate phage. The virulent one could superinfect cells containing Cf1t lysogen. Therefore, we have named it Cf1tv. In a colony formation assay using cells from an infected culture, two types of colonies were observed, small and large. It could be proven that the formation of small colonies is the result of killing during Cf1tv infection. The number of small colony forming units (cfu) increased with infection time and reached a maximum at 16 h after infection, then dropped to the initial cell concentration at 28 h after infection; 28 h were required to kill all infected cells. Large colonies contained uninfected or phage-resistant cells, but no lysogenic cells. Bacterial death was further confirmed by a microculture assay. At 2 h after infection, normal-dividing cells (cfu giving large colonies) contained about 40% of Cf1tv-infected cells, then the percentage decreased with infection time. Slow-dividing cells (infected cfu giving small colonies) initially contained 55% of cells; this percentage increased slightly at 4 h after infection, then decreased at 8 h after infection. Non-dividing cells initially contained 5% of infected cells, then their numbers rapidly increased with time after infection. The cell division was seriously affected and finally stopped. During one-step growth, the latent period was 30 min and there was no burst; phages were released at 30 min after infection and the rate of release increased gradually with time after infection. Phage DNA integration into host chromosome could not be observed.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sera from 3528 patients with autoimmune disease, and non-autoimmune disease, and 500 normal individuals were studied For the presence of anticentromere antibodies (ACA) by indirect immunofluorescence on HEP-2 cells. Sixty-seven specimens were identified showing discrete speckled staining: 55 (82.1%), 11 (16.4%), and one (1.5%), were from patients with autoimmune disease, non-autoimmune disease and normal control subjects, respectively. These ACA were present frequently in CREST syndrome (55%), Raynaud's disease (29.6%) and primary biliary cirrhosis (30%). Only 16.4% of the antibody positive patients carried a clinical diagnosis of CREST, which means that ACA are not specific for CREST syndrome. High antibody titre persisted irrespective of whether or not the patients had active disease. The ACA were present infrequently in Sjögren's syndrome, systemic lupus erythematosus, rheumatoid arthritis, immune thrombocytopenic purpura, Graves' disease, immune haemolytic anaemia, and vitiligo. Sera from 107 patients with various other autoimmune diseases were negative for ACA.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 6270-6290 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: As a function of the coupling constant, it is shown that the Schwinger–Dyson equation has many bifurcation solutions that branch off from the trivial solution. Three of these solutions are obtained explicitly, using the parameter imbedding method and the Liaponov–Schmidt method. Application of these methods to other nonlinear problems is discussed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 6693-6702 
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The parameter imbedding method for the Fredholm equation converts it into an initial value problem in its parameter λ. The method is established for general operator equations of the form [I+fˆ(λ)]ψ=φ. It is particularly useful for studying spontaneous symmetry breaking problems such as contained in the nonlinear Schwinger–Dyson equation. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heterojunction bipolar transistors (HBTs) with bases composed of a single monolayer of dopant are found to have exponentially increasing current gain as the temperature is lowered, in contrast to the gains of homogeneously doped HBTs, which have little dependence on temperature. We present GaAs-AlGaAs HBTs with base doping as high as 3×1014 cm−2 with a room-temperature current gain of 14. The sheet resistance of such a layer is 270 Ω/square at room temperature, and the carriers are restricted to a 15 A(ring) layer, implying an extremely short base transit time. AT 77 K the gain increases to 220, while the base resistance decreases to 190 Ω/square. Therefore by operating this HBT at low temperature we have achieved for the first time high gain and low base resistance in a HBT with an infinitesimally thin base.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3399-3401 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The successful growth of ultrathin CoGa on GaAs by MBE is demonstrated. The crystalline quality of the films is verified by in situ RHEED, RBS, and x-ray rocking curve. Transport studies are performed in the temperature range of 4 to 300 K for layer thickness from 10 to 730 A(ring), and all the films are found to be electrically continuous. The Markowitz's model [Phys. Rev. B 15, 3617 (1977)] of the electrical resistivity is applied to analyze the measured data. Finally, the specularly scattering probability of these thin films is studied using Fuchs' theory [Proc. Cambridge Philos. Soc. 34, 100 (1938)].
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1452-1454 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We examine atomic diffusion of Si, when initially δ doped into very pure GaAs layers grown by gas source molecular beam epitaxy. A nonlinear Si diffusion coefficient versus inverse temperature is observed as a two-component Arrhenius dependence in which the activation energies change by 1.5 eV. Furthermore, when Si diffusion is thermally activated with the lower energy kinetics, the corresponding impurity profile grows in width linearly with the anneal time. We explain the above departures of measured Si diffusivity from classical impurity diffusion via a nonequilibrated concentration of vacancies generated at the δ position during the anneal.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 19 (1992), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Primary cutaneous ostcosarcoma is extremely rare. An extra-skeletal osteosarcoma of the skin occurring in the popliteal region of a 51-year-old woman is described. There were no associated prediposing conditions.
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the ground-state energy of normal and spin-polarized3He within a model-space ring diagram framework where the particle-particle hole-hole (pphh) ring diagrams of the ground-state energy shift are summed up to all orders. The Aziz HFDHE2 and HFD-B(HE) interactions are employed. We first calculate a model space reaction matrix(G M ) whose intermediate states are required to be outside the chosen model space. The pphh ring diagrams withG M -matrix vertices are then summed within the model space by way of a PRA-type secular equation. The continuous single-particle spectrum of Mahaux is chosen in the present work. It is found that the inclusion of the pphh ring diagrams gives a significant increase in the binding energy per particle(BE/A) as compared with Brueckner-Hartree-Fock calculations. For normal and spin-polarized3He our calculated values forBE/A and saturation densities are respectively (1.86 K, 0.72 Å−1) and (1.59 K, 0.91 Å−1), while the corresponding experimental values for normal3He are (2.47 K, 0.785 Å−1).
    Type of Medium: Electronic Resource
    Signatur Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...