Search Results - (Author, Cooperation:P. S. White)
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1Latest Papers from Table of Contents or Articles in PressS. Zaidi ; M. Choi ; H. Wakimoto ; L. Ma ; J. Jiang ; J. D. Overton ; A. Romano-Adesman ; R. D. Bjornson ; R. E. Breitbart ; K. K. Brown ; N. J. Carriero ; Y. H. Cheung ; J. Deanfield ; S. DePalma ; K. A. Fakhro ; J. Glessner ; H. Hakonarson ; M. J. Italia ; J. R. Kaltman ; J. Kaski ; R. Kim ; J. K. Kline ; T. Lee ; J. Leipzig ; A. Lopez ; S. M. Mane ; L. E. Mitchell ; J. W. Newburger ; M. Parfenov ; I. Pe'er ; G. Porter ; A. E. Roberts ; R. Sachidanandam ; S. J. Sanders ; H. S. Seiden ; M. W. State ; S. Subramanian ; I. R. Tikhonova ; W. Wang ; D. Warburton ; P. S. White ; I. A. Williams ; H. Zhao ; J. G. Seidman ; M. Brueckner ; W. K. Chung ; B. D. Gelb ; E. Goldmuntz ; C. E. Seidman ; R. P. Lifton
Nature Publishing Group (NPG)
Published 2013Staff ViewPublication Date: 2013-05-15Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Adult ; Case-Control Studies ; Child ; Chromatin/chemistry/metabolism ; DNA Mutational Analysis ; Enhancer Elements, Genetic/genetics ; Exome/genetics ; Female ; Genes, Developmental/genetics ; Heart Diseases/*congenital/*genetics/metabolism ; Histones/chemistry/*metabolism ; Humans ; Lysine/chemistry/metabolism ; Male ; Methylation ; Mutation ; Odds Ratio ; Promoter Regions, Genetic/geneticsPublished by: -
2Articles: DFG German National LicensesStaff View
ISSN: 1572-9761Keywords: equilibrium landscape ; forest structure ; grain size ; spatial heterogeneity ; spatial scale ; species composition ; temperate forestSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract To investigate applicability of the equilibrium landscape concept to various attributes of vegetation, the effects of sampling area (or grain size) on structural and compositional stand parameters were determined in an old-growth hemlock-hardwood forest. Three 1-ha plots, each gridded into 100 0.01-ha subplots, were established on the Roaring Fork watershed in Great Smoky Mountains National Park, Tennessee, USA. Estimates for 10 different stand descriptors were calculated for a variety of grain sizes (subplot aggregation levels) ranging from 0.01 to 1 ha. The stand descriptors included measures of physical structure (basal area and biomass) as well as measures of species composition (relative basal area). All stand descriptors exhibited high deviation from the corresponding 3-ha mean at grain sizes approximating observed canopy gap area (〈0.02 ha). Deviations for total tree density, basal area and biomass diminished sharply with increasing grain size, while deviations for relative basal area of four important species remained relatively high even at grain sizes 〉0.5 ha. The relationship between sample variance and grain size was inverse and approximately log-log linear for all descriptors. Biomass, basal area, and large canopy tree density had relatively steep slopes. These variables of physical structure presumably were related to canopy gap size and distribution. The remaining measures of density and relative basal area had gentler slopes, indicating a milder decrease in variation with increasing grain size. Coefficients of variation for each parameter also showed this response to grain size, with compositional parameters having relatively high variation at scales 〉 0.5 ha. In general, the nature of physical structure patches (e.g. total basal area and biomass) differed from that of composition patches (e.g. relative basal area of individual species). This contrast should be considered in equilibrium landscape concepts and vegetation sampling design.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 1573-5052Keywords: Community structure ; Disturbance ; Gradient analysis ; Successional strategies ; Temperate forestSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract In constructing models of species and community distributions along environmental gradients in the Great Smoky Mountains, R. H. Whittaker (1956) focused on old-aged, apparently stable, natural communities. More recent studies indicate that disturbance gradients potentially influence and are influenced by the complex environmental gradients of Whittaker's original models. Using primarily fire and exotic species invasion as examples, this paper shows: 1) disturbance parameters vary along the topographic, elevation and moisture gradients in the Great Smoky Mountains in much the same way as temperature, moisture and solar radiation change; 2) species composition at different locations along the major environmental gradients is partially determined by the disturbance parameter; 3) species characteristics such as mode of reproduction are often correlated with specific disturbance parameters; 4) functional aspects of ecosystem response to disturbance vary along environmental gradients; and 5) man-caused disturbance may vary along environmental or biotic gradients. Since disturbance gradients may parallel physical environmental gradients, the two may be difficult to distinguish. Modification of disturbance frequencies along major environmental gradients may result in slow shifts in the distribution of both individual species and whole communities.Type of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesStaff View
ISSN: 1573-5052Keywords: Spruce-fir forests ; Appalachian Mountains ; Latitude-elevation relationship ; TreelineSource: Springer Online Journal Archives 1860-2000Topics: BiologyNotes: Abstract Spruce-fir forests extend along the Appalachian Mountains of eastern North America from 35° to 49° N. This montane vegetation differs from boreal spruce-fir forest in that it is dominated by Picea rubens, has a higher vascular species richness, has wind, rather than fire, dominated dynamics, and has a mean annual temperature above 2 °C. Using field reconnaissance, remote sensing, and literature review we described and modeled the latitude-elevation relationship for Appalachian spruce-fir. The elevation of the sprucefir/deciduous forest ecotone decreases from 1,680 m at 35° N to 150 m at 49° N, while the elevation of treeline (spruce-fir/tundra ecotone) decreases from 1,480 m at 44° N to 550 m at 55° N. Linear regressions gave latitude-elevation relationships of −100 m/lo Latitude for the spruce-fir/deciduous forest ecotone and −83 m/lo Latitude for treeline. These values compare to literature reports of −54 to −230 m/lo Latitude and are most similar to values reported from eastern Asia. The latitude-elevation relationship for eman July temperature ( −94 to −121 m/lo Latitude) was more similar to the slopes of these ecotones than is the slope for mean annual temperature ( −170 to −220 m/lo Latitude). The spruce-fir/deciduous forest ecotone was correlated with a mean July temperature of approximately 17 °C. Treeline was correlated with a mean July temperature of approximately 13 °C.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesBroschag, M. ; Klapötke, T. M. ; Schulz, A. ; Tornieporth-Oetting, I. C. ; Umbach, P. ; White, P. S.
Weinheim : Wiley-Blackwell
Published 1994Staff ViewISSN: 0044-2313Keywords: Cyanuric chloride ; FPDE values ; crystal structure ; chlorotrifluoro methane ; oxidative fluorinators ; ab initio computations ; Chemistry ; Inorganic ChemistrySource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyDescription / Table of Contents: Fluorination of Cyanuric Chloride and Low-Temperature Crystal Structure of [(ClCN)3F]+[AsF6]-The low-temperature fluorination of cyanuric chloride, (ClCN)3, with F2/AsF5 in SO2F2 solution yielded the salt [(ClCN)3F]+ [AsF6]- (1) essentially in quantitative yield. Compound 1 was identified by a low-temperature single crystal X-ray structure determination: R 3c, trigonal, a = b = 10.4246(23) Å, c = 15.1850(24) Å, V = 1429.1(4) Å 3, Z = 6, RF = 0.056, Rw = 0.076 (for significant reflections), RF = 0.088, Rw = 0.079 (for all reflections). Fluorination of neat (ClCN)3 with [NF4]+ [Sb2F11]- yielded NF3, CClF3, SbF3, N2 and traces of CF4. A qualitative scale for the oxidizing strength of the oxidative fluorinators NF4+ and (XCN)3F+ (X = H, F, Cl) has been computed ab initio.Notes: Durch Tieftemperaturfluorierung von Cyanurchlorid, (ClCN)3, mit F2/AsF5 in SO2F2-Lösung wurde [(ClCN)3F]+ [AsF6]- (1) in nahezu quantitativer Ausbeute dargestellt, aus SO2 bei Raumtemperatur umkristallisert und durch eine Tieftemperatur-Röntgenstrukturanalyse (-170°C) identifiziert: R 3c, trigonal, a = b = 10,4246(23) Å, c = 5,1850(24) Å, V = 1 429,1(4) Å3, Z = 6, RF = 0,056, Rw = 0,076 (für wesentliche Reflexionen), RF = 0,088, Rw = 0,079 (für alle Reflexe). Die Fluorierung von festem (ClCN)3 mit [NF4]+ [Sb2F11]- im Molverhältnis 1:2 lieferte NF3, CClF3, SbF3, N2 und Spuren an CF4. Eine qualitative Reihenfolge bezüglich der FPDE-Werte von NF4+ und (XCN)3F+ (X = H, F, Cl) wurde ab initio berechnet.Additional Material: 3 Ill.Type of Medium: Electronic ResourceURL: