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1Latest Papers from Table of Contents or Articles in PressM. B. Gerstein ; J. Rozowsky ; K. K. Yan ; D. Wang ; C. Cheng ; J. B. Brown ; C. A. Davis ; L. Hillier ; C. Sisu ; J. J. Li ; B. Pei ; A. O. Harmanci ; M. O. Duff ; S. Djebali ; R. P. Alexander ; B. H. Alver ; R. Auerbach ; K. Bell ; P. J. Bickel ; M. E. Boeck ; N. P. Boley ; B. W. Booth ; L. Cherbas ; P. Cherbas ; C. Di ; A. Dobin ; J. Drenkow ; B. Ewing ; G. Fang ; M. Fastuca ; E. A. Feingold ; A. Frankish ; G. Gao ; P. J. Good ; R. Guigo ; A. Hammonds ; J. Harrow ; R. A. Hoskins ; C. Howald ; L. Hu ; H. Huang ; T. J. Hubbard ; C. Huynh ; S. Jha ; D. Kasper ; M. Kato ; T. C. Kaufman ; R. R. Kitchen ; E. Ladewig ; J. Lagarde ; E. Lai ; J. Leng ; Z. Lu ; M. MacCoss ; G. May ; R. McWhirter ; G. Merrihew ; D. M. Miller ; A. Mortazavi ; R. Murad ; B. Oliver ; S. Olson ; P. J. Park ; M. J. Pazin ; N. Perrimon ; D. Pervouchine ; V. Reinke ; A. Reymond ; G. Robinson ; A. Samsonova ; G. I. Saunders ; F. Schlesinger ; A. Sethi ; F. J. Slack ; W. C. Spencer ; M. H. Stoiber ; P. Strasbourger ; A. Tanzer ; O. A. Thompson ; K. H. Wan ; G. Wang ; H. Wang ; K. L. Watkins ; J. Wen ; K. Wen ; C. Xue ; L. Yang ; K. Yip ; C. Zaleski ; Y. Zhang ; H. Zheng ; S. E. Brenner ; B. R. Graveley ; S. E. Celniker ; T. R. Gingeras ; R. Waterston
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-08-29Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Caenorhabditis elegans/embryology/*genetics/growth & development ; Chromatin/genetics ; Cluster Analysis ; Drosophila melanogaster/*genetics/growth & development ; *Gene Expression Profiling ; Gene Expression Regulation, Developmental/genetics ; Histones/metabolism ; Humans ; Larva/genetics/growth & development ; Models, Genetic ; Molecular Sequence Annotation ; Promoter Regions, Genetic/genetics ; Pupa/genetics/growth & development ; RNA, Untranslated/genetics ; Sequence Analysis, RNA ; Transcriptome/*geneticsPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] It is desirable to test the performance of an apparatus of this sort by examining a transition the lifetime of which is believed to be much shorter than the resolving time of the apparatus, so giving what is usually called a 'prompt' curve. We have endeavoured to use for this purpose the 5016 A. ...Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract There are two parts to this paper. In the first we calculate the hydrodynamic response of the solar atmosphere to the injection of an intense beam of electrons in a numerical simulation of a solar flare. In the second we predict the spectroscopic consequences of the hydrodynamic behaviour calculated in the first part. The hydrodynamics is predicted by solving the equations of conservation of mass, momentum, and energy. The latter is expressed as two temperature equations; one for the electrons and the other for the neutral atoms and positive ions of hydrogen. The equations are solved in one dimension and the geometric form is of a semi-circular loop having its ends in the photosphere. The results show how the loop is filled at supersonic speed with plasma at temperatures characteristic of flares. At the same time a compression wave is predicted to propagate down towards the photosphere. After the heating pulse stops, the plasma that has risen into the loop, starts to decay and return to the condition it was in before the pulse started. In predicting the spectrum that would be emitted by such a plasma calcium was chosen for illustration. The first and main part of this calculation was setting up and solving the time-dependent equations of ionization/recombination. In order to provide a standard for comparison the same ionization and recombination rate coefficients are used to predict the steady-state distribution of populations of ionization stages. This is then compared with the distribution found from the time-dependent solution and shows that there is a negligibly small time lag predicted by the time-dependent result. However the more significant comparisons to make are between the temperatures of the peak abundances of the various ions under the assumptions of steady-state and time-dependent ionization. For the particular circumstances chosen here the temperature differences are predicted to be in the neighbourhood of 10% or less and in view of the overall accuracy of the atomic data are not significant. It would appear therefore that the much simpler assumption of steady-state ionization balance leads to results of acceptable accuracy for the particular case considered.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesTHONEMANN, P. C. ; BUTT, E. P. ; CARRUTHERS, R. ; DELLIS, A. N. ; FRY, D. W. ; GIBSON, A. ; HARDING, G. N. ; LEES, D. J. ; MCWHIRTER, R. W. P. ; PEASE, R. S. ; RAMSDEN, S. A. ; WARD, S.
[s.l.] : Nature Publishing Group
Published 1958Staff ViewISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] Introduction The basic conditions which must be established before a thermonuclear reactor is possible are, first, the containment of a high-temperature gas so that it is isolated from the walls of the surrounding vessel, and second, the attainment of temperatures sufficiently high for nuclear ...Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1476-4687Source: Nature Archives 1869 - 2009Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsNotes: [Auszug] In this communication there is proposed a more complex recombination mechanism which is based on well-known atomic collision processes, and which may help to explain the observed values. The three-body recombination-rate (derived from the classical ioniza-tion-rate) is proportional to the fourth ...Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The intensity ratio of the components of the MgXII doublet was measured during a solar flare using one of the instruments on the Solar Maximum Mission spacecraft. The results are in good agreement with those reported previously and explained in terms of the effect of the trapping of resonance radiation.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesSylwester, B. ; Faucher, P. ; Jakimiec, J. ; Krutov, V. V. ; McWhirter, R. W. P. ; Sylwester, J. ; Tomczak, M. ; Volonté, S. ; Zhitnik, I. A.
Springer
Published 1986Staff ViewISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract The intensity ratio of the components of the Mg xii 8.42 Å (1s 2 S 1/2 − 2p 2 P 1/2, 3/2) doublet in solar flare spectra has been investigated using observations recorded from the Intercosmos 7 satellite. The observed values of the ratio fall within the interval 0.38–0.66 and have been compared with recent theoretical predictions based on an optically thin collisional-radiative model. It has been found that for the flare plasma the low values of the ratio cannot be explained since they fall below the smallest theoretical value. The highest values on the other hand require that an unacceptably high electron density be postulated. It is suggested that both high and low values may be caused by the resonance line scattering of the Mg xii quanta in the flare volume, provided that the volume is elongated and not spherical. The intensity of the nearby satellite lines is also investigated. Good agreement between the theoretical and observed intensities is found.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesBoland, B. C. ; Engstrom, S. F. T. ; Jones, B. B. ; McWhirter, R. W. P. ; Thonemann, P. C. ; Wilson, R.
Springer
Published 1972Staff ViewISSN: 1572-9672Source: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract Observations of the solar spectrum have been made between 1200–2200 Å with high spectral resolution. The results were obtained with an all-reflecting echelle spectrograph carried by a stabilized Skylark rocket launched in April 1970. Measurements of the profiles of a number of emission lines due to Siii, Cii, Siiii and Civ formed in the temperature range 104-105 K, indicate ion energies which are considerably in excess of the electron temperatures derived from the ionization balance. Since the ion/electron relaxation time is very short the observed ion energies cannot correspond to an ion temperature and hence a non-thermal mechanical energy component exists in the transition zone. It is postulated that the non-thermal energy component represents the actual mechanical energy responsible for the heating of the corona, and, that, it is propagated as an acoustic wave. On this basis and with a preliminary estimate of the reflection from the transition zone, a flux of 3 × 105 erg cm -2 s -1 is established as entering the corona. This value is in agreement with estimates of the total energy loss from the corona due to conduction, radiation and the solar wind, thus establishing a gross energy balance. Theoretical calculations are currently underway to establish the physical nature of the atmosphere which would result from such a propagating flux. At the present time this has been carried out for an atmosphere in hydrostatic equilibrium and the energy balance equation solved. A preliminary temperature structure which results is shown in Figure 1, together with the derived distribution in electron density. This gives a corona of the right temperature and density but the observed structure deviates in detail from those derived from an analysis of the solar XUV spectrum.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 1573-093XSource: Springer Online Journal Archives 1860-2000Topics: PhysicsNotes: Abstract In this paper we analyse the solar spectral intensities observed with the CHASE grazing incidence telescope and spectrometer flown on NASA's Spacelab 2 Mission in 1985. Our main purpose has been to investigate the sources of error that arise in the application of the differential emission measure technique used to analyse such data. We suggest methods by which these sources of error may be investigated.Type of Medium: Electronic ResourceURL: