134,564 research outputs found
Asymptotic consistency under large entropy sampling designs with unequal probabilities
No full textA large part of survey sampling literature is devoted to unequal probabilities sampling designs without replacement. Brewer and Hanif (1983) provided a summary of these sampling designs. The maximum entropy designs is one of them. Consistency results have been proven for the maximum entropy sampling (Hájek, 1964). The aim is to give sufficient conditions under which Hájek (1964) consistency results still hold for large entropy sampling designs which are different from the maximum entropy design. These conditions involve modes of convergence of sampling designs towards the maximum entropy design. We show that these conditions are satisfied for the popular Rao-Sampford (Rao, 1965, Sampford, 1967) design. Our consistency results are applied to the Hájek (1964) simple variance estimator. This estimator does not require joint-inclusion probabilities and can be easily estimated using weighted least squares regression (Berger, 2004, 2005b). Deville (1999) conjectured that this estimator is suitable for any sampling designs (see also Brewer and Donadio, 2003). Our consistency result gives regularity conditions under which this estimator is consistent which justifies Deville’s (1999) conjecture
Juvenile boars and testicular micro RNA
No full textData represent micro RNA concentrations in testicular tissue at pivotal points in Sertoli cell proliferation. Three in vivo pig models that stimulate Sertoli cell proliferation in vivo were evaluated. These three models were hemicastration on day 8, daily treatment with the androgen receptor blocker, flutamide, and weekly treatment with the aromatase inhibitor, letrozole. Time points were chosen to provide data on levels near the beginning of a demonstrable treatment effect Treatments Sertoli cell response and tissue and circulating hormone levels are described more completely in:
Berger, T., Conley, A., 2014. Reduced endogenous estrogen and hemicastration interact synergistically to increase porcine Sertoli cell proliferation. Biol Reprod 90, 114;
Berger, T., Sidhu, P., Tang, S., Kucera, H., 2019. Are testicular cortisol and WISP2 involved in estrogen-regulated Sertoli cell proliferation? Anim Reprod Sci 207, 44-51; and
Legacki, E., Conley, A.J., Nitta-Oda, B.J., Berger, T., 2015. Porcine Sertoli cell proliferation after androgen receptor inactivation. Biol Reprod 92, 93.
In each model, one littermate was treated and the remaining littermate served as the control. Testicular tissue was flash-frozen on dry ice. The miRNA was analyzed using miRCURY assay kits from Qiagen (Germantown, MD,USA) after isolation of mRNA using Qiazol cDNA synthesis as described in the kits.
The micro RNA data are expressed as the delta Ct for the specific micro RNA relative to the reference micro RNA, miR-103 for each littermate. Samples within the four different data sets were potentially analyzed on different days with different lots of primer, which limits the value of comparisons between datasets
Samuel Berger Memorial Lecture (1983): Dr. John T. Dunlop
No full text3rd Annual Samuel D. Berger memorial lecture. John Dunlop lectured on "The important issues in the field of labor and international affairs." He remarked on the American labor movement, the International Trade Union Confederation, and labor unions. He also talked about international affairs and labor, the ILO (International Labour Organization) constitution and conventions, and U.S. relations to the ILO
Berger\u27s Satisfactory Likeness Abraham Lincoln Photograph
No full textThe carte de visite features a reproduction of Anthony Berger\u27s 9 February 1864 photograph of Abraham Lincoln. Robert T. Lincoln once wrote that he believed this was the most satisfactory likeness of his father. [Ref: O-92.] The image shows Lincoln from the waist up in a seated position.https://scholarsjunction.msstate.edu/fvw-cdv/1595/thumbnail.jp
[Lieutenant Colonel Dudley W. Jones, Confederate States Army]
No full textPortrait of Lieutenant Colonel Dudley W. Jones (1840-1869), 9th Texas Cavalry, Confederate States Army. This carte de visite shows Colonel Jones dressed in the regulation uniform of a Confederate colonel with three stars on his collar. Source: Lawrence T. Jones III.Attributed to: Miller & Berger. Recto: [handwritten] Col. D. W. Jones, 9th, Tex. Verso: [handwritten] Colonel D. W. Jones (9th Tex), Found with photo of John Ward (Grandfather) taken by Miller & Berger of Marlin, Tex., J. Ward - B. Sept 20, 1845 D. -- 1919, Grandfather's Col. in Civil War
Library Staff Lois Berger Magazine Reshelving 1992 Picture
No full textFormer T-SPL staff member Lois Berger places new magazines on the periodical shelving
Transient rhythmic network activity in the somatosensory cortex evoked by distributed input in vitro
No full textThe initiation and maintenance of physiological and pathophysiological oscillatory activity depends on the synaptic interactions within neuronal networks. We studied the mechanisms underlying evoked transient network oscillation in acute slices of the adolescent rat somatosensory cortex and modeled its underpinning mechanisms. Oscillations were evoked by brief spatially distributed noisy extracellular stimulation, delivered via bipolar electrodes. Evoked transient network oscillation was detected with multi-neuron patch-clamp recordings under different pharmacological conditions. The observed oscillations are in the frequency range of 2-5 Hz and consist of 4-12 mV large, 40-150 ms wide compound synaptic events with rare overlying action potentials. This evoked transient network oscillation is only weakly expressed in the somatosensory cortex and requires increased [K+]o of 6.25 mM and decreased [Ca2+]o of 1.5 mM and [Mg2+]o of 0.5 mM. A peak in the cross-correlation among membrane potential in layers II/III, IV and V neurons reflects the underlying network-driven basis of the evoked transient network oscillation. The initiation of the evoked transient network oscillation is accompanied by an increased [K+]o and can be prevented by the K+ channel blocker quinidine. In addition, a shift of the chloride reversal potential takes place during stimulation, resulting in a depolarizing type A GABA (GABAA) receptor response. Blockade of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-proprionate (AMPA), N-methyl-D-aspartate (NMDA), or GABA(A) receptors as well as gap junctions prevents evoked transient network oscillation while a reduction of AMPA or GABA(A) receptor desensitization increases its duration and amplitude. The apparent reversal potential of -27 mV of the evoked transient network oscillation, its pharmacological profile, as well as the modeling results suggest a mixed contribution of glutamatergic, excitatory GABAergic, and gap junctional conductances in initiation and maintenance of this oscillatory activity. With these properties, evoked transient network oscillation resembles epileptic afterdischarges more than any other form of physiological or pathophysiological neocortical oscillatory activity
Orogen‐Parallel Migration of Exhumation in the Eastern Aar Massif Revealed by Low‐T Thermochronometry
No full textNew and published (U-Th)/He data on zircon, apatite, and zircon fission track ages constrain the thermal overprint and cooling history of the eastern Aar Massif, Switzerland. The timing and pattern of cooling is in agreement with independent kinematic and age constraints from exposed shear zones. This suggests that the cooling ages mainly reflect exhumation and that long-term exhumation-dynamics were mainly controlled by crustal-scale tectonic processes. Results of a statistical inverse model reveal significant diachrony in the timing of exhumation in the along-strike direction. Maximum exhumation rates (urn:x-wiley:21699313:media:jgrb55226:jgrb55226-math-00011 mm/yr) were initially located in the central Aar Massif (from urn:x-wiley:21699313:media:jgrb55226:jgrb55226-math-000222 to 10 Ma), then gradually migrated to the east between urn:x-wiley:21699313:media:jgrb55226:jgrb55226-math-000310 Ma and present, while the central Aar Massif continued to exhume at slower rates (urn:x-wiley:21699313:media:jgrb55226:jgrb55226-math-00040.5 mm/yr). The diachrony in the timing of exhumation may be explained by lateral variations in the inherited thickness or the density of the accreted European crust. We attribute the increase in exhumation rates between 2 Ma and present to enhanced glacial erosion. Nevertheless, the post 2 Ma exhumation pattern reflects a continuation of noncylindrical massif “growth” in the eastward orogen-parallel direction. This indicates that—although at slow rates—thick-skinned and buoyancy-driven compressional deformation, likely enhanced by the presence of easily erodible flysch units at the surface, might still be ongoing especially in the eastern Aar Massif. Noncylindrical massif-growth is likely to also affect other External Crystalline Massifs or orogens, but may be overlooked because studies often focus on single orogen-perpendicular transects
A Note on the asymptotic equivalence of jackknife and linearization variance estimation for the Gini Coefficient
No full textThe Gini coefficient has proved valuable as a measure of income inequality. In cross-sectional studies of the Gini coefficient, information about the accuracy of its estimate is crucial. We show how to use jackknife and linearization to estimate the variance of the Gini coefficient, allowing for the effect of the sampling design. The aim is to show the asymptotic equivalence (or consistency) of the generalised jackknife estimator and the Taylor linearization estimator for the variance of the Gini coefficient. A brief simulation study supports our findings
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