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  • 1995-1999  (73)
  • 1990-1994  (84)
  • 1
    Electronic Resource
    Electronic Resource
    A morphological comparison of alates between monogynous and polygynous colonies of Myrmica kotokui in northernmost Japan (1999)
    Springer
    Insectes sociaux 46 (1999), S. 250-255 
    Details
    ISSN: 1420-9098
    Keywords: Key words:Myrmica kotokui, microgyne, macrogyne, polygyny, monogyny, allometry.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: Social structure and sexual size of two populations of Myrmica kotokui were compared. Most of the colonies were polygynous in one population and monogynous in the other. Mean body size of the queens was larger in the monogynous population than in the polygynous population. Although the polygynous population contained many large queens, their wing length was significantly shorter than that of queens in the monogynous population. Some females in the polygynous population were intermorphic between typical workers and queens, while the females of the monogynous population were clearly divided into worker and queen castes without any intermorphic females. The body size of the males showed a large variation and the mean was not significantly different between the two populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050142
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  • 2
    Electronic Resource
    Electronic Resource
    Application of 6 MeV/n heavy-ion beams to biophysical experiments (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2000-2004 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new accelerator facility and two irradiation methods using 6 MeV/n heavy-ion beams are described along with preliminary results concerning their applications to biophysical investigations. The beams are obtained from the injector linac installed at the Heavy Ion Medical Accelerator in Chiba. Various ion species (He–Xe) having different charge states are accelerated to the same velocity, which is suitable for comparing the charge effects of heavy ions in the high linear energy transfer region. An attempt has been made to test the usefulness of the apparatus for studying track structure by using pBR322 plasmid DNA and spores as targets in vacuum. Newly constructed equipment with a molecular-beam source (water vapor) placed on this beam line is also described. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146958
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  • 3
    Electronic Resource
    Electronic Resource
    Development of the National Institute of Radiological Sciences electron cyclotron resonance ion source for the heavy ion medical accelerator in Chiba : Proceedings of the 5th international conference on ion sources (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1087-1089 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The development of an electron cyclotron resonance ion source for the heavy ion medical accelerator in Chiba (HIMAC) injector is reported. The HIMAC is a heavy ion medical accelerator for cancer therapy. The electron cyclotron resonance (ECR) ion source is expected to provide a long lifetime, easy operation, and easy maintenance for medical use. The NIRS-ECR ion source has a single closed ECR stage, and a microwave frequency of 10 GHz is applied. Under the present performance, the output electrical currents of the ions are 2500 eμA for He1+, 300 eμA for C2+, 480 eμA for Ne3+, and 110 eμA for Ar6+. Stability of the intensity is better than 2%. The transmission efficiency through a low-energy beam-transport line with an acceptance of 200 πmm mrad is more than 70%; the typical 50% and 90% emittances of the injection beam with 8 keV/u are 20 and 80 πmm mrad, respectively. These performances satisfy the requirements for radiotherapy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145071
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  • 4
    Electronic Resource
    Electronic Resource
    Study of crystallographic orientations in the diamond film on cubic boron nitride using Raman microprobe (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 428-431 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured Raman spectra of a diamond film prepared on the (111) surface of cubic boron nitride(c-BN) by the dc plasma chemical vapor deposition method. The polarization property of the Raman line of diamond agrees well with that of LO phonon for the (111) surface of c-BN. The agreement between the polarization property of Raman lines of diamond and c-BN indicates a possibility of the heteroepitaxial growth of the diamond film on the (111) surface of c-BN. It is found that the diamond layers on c-BN are under tensile stress of 2.2×1011 dyn/cm2. The value of the corresponding tensile strain agrees well with the lattice mismatch calculated from the lattice constants of c-BN and diamond, supporting the possibility of the heteroepitaxial growth of the diamond film. Raman spectroscopy is a powerful technique not only to estimate the stress in the diamond film but also to determine the crystallographic orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103656
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  • 5
    Electronic Resource
    Electronic Resource
    Epitaxial growth of diamond thin films on cubic boron nitride {111} surfaces by dc plasma chemical vapor deposition (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 563-565 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamond thin films have been grown epitaxially on high-pressure synthesized cubic boron nitride (c-BN) particles by using dc plasma chemical vapor deposition. At the early growth stage of the film on c-BN{111} surfaces, the island structure is observed and the number density of islands is about 1011 cm−2. The growth and the coalescence of islands are also found by scanning electron microscopy observation. The continuous film is obtained at the thickness of about 2000 A(ring) and the surface of the film is rather smooth. The Raman peak of the epitaxial diamond film shows the shift toward the lower wave number due to the tensile stress involved in the film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103647
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  • 6
    Electronic Resource
    Electronic Resource
    Immunohistochemical Localization of the Proteins Associated with Brain N-Type Calcium Channels (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 707 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb38075.x
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  • 7
    Electronic Resource
    Electronic Resource
    Global changes in gene expression related to antibiotic synthesis in Streptomyces hygroscopicus (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Two-dimensional gel electrophoresis was used to follow low changes in gene expression associated with antibiotic (bialaphos) biosynthesis in Streptomyces hygroscopicus. Cultures were pulse-labelled with [35S]-methionine before, during, and after the switch from primary to secondary metabolism in order to compare kinetic profiles of bialaphos (antibiotic) production (bap) genes during this metabolic transition. Separation of gene products on two-dimensional gels revealed that 27 were dependent on brpA for optimal expression and were activated as the culture approached stationary phase. Genes which encoded 10 brp4-dependent proteins were mapped to a 10 kb Sstl fragment of the 35 kb bap gene cluster by expressing them in Streptomyces lividans using the thiostrepton-inducible tipA promoter. N-terminal amino acid sequences of two brpA-dependent proteins, obtained by direct microsequencing of protein spots excised from two-dimensional gels, identified them as gene products mapping to the same region and involved in secondary metabolic conversions of the bap pathway. The kinetics of synthesis of 16 brpA-dependent gene products were characterized using QUEST computer software. Cluster analysis performed on the kinetics of synthesis of 346 of the most highly expressed gene products of HP5-29, including 16 brpA-dependent ones, identified 75 families having distinct patterns of expression. Many brpA-dependent proteins were clustered together; 10 were found in one kinetic family. These kinetic families also included brpA-independent gene products perhaps subject to similar regulatory mechanisms and thus possibly involved in bialaphos biosynthesis. The activation/derepression of bap expression took place as cultures approached stationary phase and was temporally related to synthesis of ppGpp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb02163.x
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  • 8
    Electronic Resource
    Electronic Resource
    A γ-ray burst preceded by X-ray activity (1991)
    [s.l.] : Nature Publishing Group
    Nature 350 (1991), S. 592-594 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first y-ray burst observed in the X-ray photon energy band was GB720427, which was detected in the 2-8 keV range4. X-ray data from GB720514 provided some evidence5 that an accompanying X-ray signal might have lasted longer than the y-ray event. Detailed X-ray observations of four catalogued ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/350592a0
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  • 9
    Electronic Resource
    Electronic Resource
    Equatorial disturbances, monsoons, and 1982–1983 ENSO (1990)
    Springer
    Meteorology and atmospheric physics 44 (1990), S. 85-100 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Interannual modes are described in terms of three-month running mean anomaly winds (u″,v″), outgoing longwave radiation (OLR″), and sea surface temperature (T * ″ ). Normal atmospheric monsoon circulations are defined by long-term average winds (u n,v n) computed every month from January to December. Daily winds are grouped into three frequency bands, i.e., 30–60 day filtered winds (u L,v L); 7–20 day filtered winds (u M,v M); and 2–6 day filtered winds (u S,v S). Three-month running mean anomaly kinetic energy (signified asK L ″ , K M ″ , andK S ″ , respectively) is then introduced as a measure of interannual variation of equatorial disturbance activity. Interestingly, all of theseK L ″ , K M ″ , andK S ″ perturbations propagate slowly eastward with same phase speed (0.3 ms−1) as ENSO modes. Associated with this eastward propagation is a positive (negative) correlation between interannual disturbance activity (K L ″ , K M ″ , K S ″ ) and interannualu″ (OLR″) modes. Namely, (K L ″ , K M ″ , K S ″ ) becomes more pronounced than usual nearly simultaneously with the arrival of westerlyu″ and negativeOLR″ (above normal convection) perturbutions. In these disturbed areas with (K L ″ , K M ″ , K S ″ 〉0), upper ocean mixing tends to increase, resulting in decreased sea surface temperature, i.e.T * ″ ≦0. Thus, groups (not individual) of equatorial disturbances appear to play an important role in determiningT * ″ variations on interannual time scales. HighestT * ″ occurs about 3 months prior to the lowestOLR″ (convection) due primarily to radiational effects. This favors the eastward propagation of ENSO modes. The interannualT * ″ variations are also controlled by the prevailing monsoonal zonal windsu n, as well as the zonal advection of sea surface temperature on interannual time scales. Over the central Pacific, all of the above mentioned physical processes contribute to the intensification of eastward propagating ENSO modes. Over the Indian Ocean, on the other hand, some of the physical processes become insignificant, or even compensated for by other processes. This results in less pronounced ENSO modes over the Indian Ocean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026812
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  • 10
    Electronic Resource
    Electronic Resource
    Lifetime measurement of the ((11/2)−) isomer in 125Cs (1998)
    Springer
    The European physical journal 2 (1998), S. 237-239 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.10.Tg Lifetimes – 23.20.Js Multipole matrix elements – 27.60.+j 90 ≤ A ≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The lifetime of the ((11/2)−) state at 267keV in 125Cs was measured. A Ge detector with the transistor reset preamplifier(TRP Ge) was used to measure delayed γ-rays under an intense prompt background. The B(M2) value deduced from the lifetime was found to be consistent with the Weisskopf estimate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050113
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