5,972 research outputs found
Gift card from E. Horwitz, M. Schumacker, and B. Telisson, Sander's Bloom Box, St. Louis, Missouri, to William Berman, St. Louis, Missouri, March 1936
No full textThis item is from the Berman Family Papers, which are primarily letters written (often in Hebrew) by Dr. William (Bill) Berman and his wife Marion, while Bill was stationed in Fort Riley, Kansas. Bill served as an Army doctor during World War II
Calculating the Galois Group of Y′===AY+++B,Y′===AY Completely Reducible
No full textAbstractWe consider a special case of the problem of computing the Galois group of a system of linear ordinary differential equations Y′=MY, M∈C (x)n×n. We assume that C is a computable, characteristic-zero, algebraically closed constant field with a factorization algorithm. There exists a decision procedure, due to Compoint and Singer, to compute the group in case the system is completely reducible. Berman and Singer (1999, J. Pure Appl. Algebr., 139, 3–23) address the case in which M= [yjsco5390x.gif M 1 * 0 M 2 ], Y′=MiY completely reducible for i= 1, 2. Their article shows how to reduce that case to the case of an inhomogeneous system Y′=AY+B, A∈C (x)n×n, B∈C (x)n, Y′=AY completely reducible. Their article further presents a decision procedure to reduce this inhomogeneous case to the case of the associated homogeneous system Y′=AY. The latter reduction involves using a cyclic-vector algorithm to find an equivalent inhomogeneous scalar equation L(y) =b,L∈C(x)[ D ], b∈C (x), then computing a certain set of factorizations of L in C(x)[D ]; this set is very large and difficult to compute in general. In this article, we give a new and more efficient algorithm to reduce the case of a system Y′=AY+B,Y′=AY completely reducible, to that of the associated homogeneous systemY′=AY. The new method’s improved efficiency comes from replacing the large set of factorizations required by the Berman–Singer method with a single block-diagonal decomposition of the coefficient matrix satisfying certain properties
Bohemian finds of stove tiles with the signature "HANS BERMAN"
No full textThe article looks at one phenomenon of material culture of 16th century in Europe - stove tiles produced by Hans Berman workshops in central Germany. The finds of renaissance stove tiles with the signature and the date - "HANS BERMAN 155X" or "HANS BERMAN 1562" are known from the area of today's Switzerland, Germany, Poland, Sweden (south), the island part of Denmark and Latvia (Riga). From Bohemia and Moravia these stove tiles were not yet published. In 2007 in collection of Regional Museum in Teplice two complexes of fragments of stove tiles with signature HANS BERMAN 155X were detected. Later similar fragments have been found on the other Bohemian sites. Most of them are located in northern Bohemia (Bílina, Krupka, Prosetice, Teplice), and two sites in eastern part of the country (Dvůr Králové nad Labem, Pecka). Frontal parts of these stove tiles are decorated with 6 various reliefs - "Adam and Eve and the Tree of Life", "Crucifixion of Jesus Christ", portraits - "elector Maurice of Saxony", "August of Saxony", an "unknown nobleman" and "Architecture - church window". It has been newly shown, that production of Hans Berman workshop was in 16th century also distributed to the Bohemia
Memory deficits in Alzheimer's patients: a comprehensive review
No full textDespite considerable experimental work on Alzheimer's disease (AD), the underlying cognitive mechanisms as well as the precise localization of neuropathological changes critical for memory loss remains undefined. A review of the neuropsychological literature on long-term memory deficits in AD patients suggests that AD patients display (a) a pervasive deficit of explicit memory, (b) a partial deficiency of implicit memory for verbal and visuoperceptual material (as measured by repetition priming procedures), and (c) a substantial sparing of implicit memory for visuomotor skills. The explicit memory loss is likely a result of encoding as well as consolidation difficulties. A faulty lexical-semantic knowledge structure appears responsible for deficient repetition priming effects. Since neuropathological changes diffusely affect the brain of AD patients, establishing a clear relationship between localization of cerebral lesions and memory deficits is particularly difficult. Nevertheless, data suggest that extensive involvement of the hippocampal-amygdala complex plays a major role in explicit memory loss. Damage to associative cortical areas likely is involved in repetition priming deficits. The relative integrity of primary motor and sensory cortical areas and of the basal ganglia likely subsume, by contrast, the normal learning of visuomotor skills
Radial limits of holomorphic functions on the ball
No full textIn this dissertation, we consider various aspects of the boundary behavior of holomorphic
functions of several complex variables. In dimension one, a characterization
of the radial limit zero sets of nonconstant holomorphic functions on the disc has
been given by Lusin, Privalov, McMillan, and Berman. In higher dimensions, no such
characterization is known for holomorphic functions on the unit ball B. Rudin posed
the question as to the existence of nonconstant holomorphic functions on the ball
with radial limit zero almost everywhere. Hakim, Sibony, and Dupain showed that
such functions exist. Because the characterization in dimension one involves both
Lebesgue measure and Baire category, it is natural to also ask whether there exist
nonconstant holomorphic functions on the ball having residual radial limit zero sets.
We show here that such functions exist. We also prove a higher dimensional version
of the Lusin-Privalov Radial Uniqueness Theorem, but we show that, in contrast to
what is the case in dimension one, the converse does not hold. We show that any
characterization of radial limit zero sets on the ball must take into account the "complex structure" on the ball by giving an example that shows that the family of these sets is not closed under orthogonal transformations of the underlying real coordinates.
In dimension one, using the theorem of McMillan and Berman, it is easy to see that
radial limit zero sets are not closed under unions (even finite unions). Since there is
no analogous result in higher dimensions of the McMillan and Berman result, it is not obvious whether the radial limit zero sets in higher dimensions are closed under finite unions. However, we show that, as is the case in dimension one, these sets are
not closed under finite unions. Finally, we show that there are smooth curves of finite
length in S that are non-tangential limit uniqueness sets for holomorphic functions
on B. This strengthens a result of M. Tsuji
CalcuttSupplementalMaterial – Supplemental material for Chimpanzees (Pan troglodytes) Are More Averse to Social Than Nonsocial Risk
No full textSupplemental material, CalcuttSupplementalMaterial for Chimpanzees (Pan troglodytes) Are More Averse to Social Than Nonsocial Risk by Sarah E. Calcutt, Darby Proctor, Sarah M. Berman and Frans B. M. de Waal in Psychological Science</p
Dopamine D2/D3 receptor availability in genetically leptin-deficient patients after long-term leptin replacement
No full textAbstract not availableK Ishibashi, S M Berman, G Paz-Filho, B Lee, C Robertson, M A Mandelkern, M-L Wong, J Licinio, E D Londo
Clathria (Clathria) priestleyae Goodwin & Berman & Hendry 2019, sp. nov.
No full text<i>Clathria</i> (<i>Clathria</i>) <i>priestleyae</i> sp. nov. <p>(Figure 14)</p> <p>lsid:zoobank.org:act: 7FE528FB-040A-4C14-9A73-A4695DF0E64B</p> <p> <b>Specimens.</b> <i>Holotype: BELUM. Mc 2015.638</i> Rocks near San Martin Islands (65°41.297’S, 65° 20.091’W), depth 6–21 m; collected by C. Goodwin and E. Priestley, 17/02/2015.</p> <p> <i>Paratypes</i>: BELUM. Mc 2015.692, BELUM.Mc2015.703 and BELUM. Mc 2015.713 Vieugue Island (65°38.758’S, 65° 12.540’W), depth 10–22 m; collected by C. Goodwin and E. Priestley, 23/02/2015; BELUM. Mc 2015.721 Port Charcot, Booth Island (65°03.853’S, 64° 01.868’W), depth 6–16 m; collected by C. Goodwin and E. Priestley, 23/02/2015. BELUM. Mc 2015.758 Paradise Bay Wall (64°53.841’S, 62° 52.391’W), depth 14–21 m; collected by C. Goodwin and E. Priestley, 24/02/2015.and BELUM. Mc 2015.775 Paradise Bay Wall (64°53.841’S, 62° 52.391’W), depth 10–24 m; collected by C. Goodwin and E. Priestley, 25/02/2015.</p> <p> <b>Comparative material examined.</b> <i>Clathria pauper</i> Brondstedt, 1927. BMNH 30.11.5.2a (tissue section and spicule preparation). Labelled ‘N of Discovery Islet from type’.</p> <p> <b>Etymology.</b> Named after Emily Priestley who was an invaluable member of the expedition dive team.</p> <p> <b>External morphology.</b> <i>In situ appearance</i> (Figure 14A): Pale yellow encrusting sponge forming patches of variable size (5–> 20 cm) on bedrock. Surface covered with spiky projections up to 2 cm in length, these are sometimes branched. The projections are cored by fibres of spicules which are visible through the projection as a central core.</p> <p> <i>Preserved appearance.</i> Fairly soft brown basal cushion with projecting, tapering spikes, up to 1 cm in length. Surface velvety, finely hispid.</p> <p> <b>Skeleton</b> (Figure 14B): In the basal cushion the choanosomal skeleton is an irregular plumo-reticulation of thick ascending fibres of primary styles (up to 20 spicules thick) which are echinated by the acanthostyles, joined by thinner secondary tracts cored by 2–3 primary styles. In the spiky surface projections, a thick ascending fibre of principal styles (up to 20 spicules thick) cores the centre of the projection. Thinner fibres of 2–3 principal styles, heavily echinated by acanthostyles, lead up to the surface at 45° angle to the central fibre. Brushes of sub-ectosomal styles join these at the surface. Microscleres are scattered throughout the tissue.</p> <p> <b>Spicules:</b> Measurements from BELUM.Mc2015.638.</p> <p>Principal styles (Figure 14C): 430(802)1105 by 14(19) 25 µm. Large smooth styles which are often slightly curved.</p> <p>Subectosomal styles (Figure 14D, E): 297(375)440 by 7(9) 11 µm. Tylote head which is spined with a few large spines.</p> <p>Acanthostyles (Figure 14F): 121(146)168 by 8(11) 21 µm. Entirely spined with fairly large spines.</p> <p>Thin toxas (Figure 14G): 154(176) 213 µm.</p> <p>Oxhorn toxas (Figure 14H): 54(69) 103 µm.</p> <p> <b>Remarks.</b> We have assigned this species to <i>Clathria</i> (<i>Clathria</i>) rather than one of the other seven subgenera on the basis of the lack of differentiation between the axial and extra-axial regions of the choanosome and the presence of a reticulate skeleton, and only a single category of auxillary styles (Hooper 2002b). Although the species has an appearance similar to <i>C.</i> (<i>Axosuberites</i>) <i>rosita</i> Goodwin, Brewin & Brickle, 2012 this subgenus has a distinctive extra-axial skeleton and lacks echinating megascleres (Hooper, 2002b). Of the 29 species present in the Antarctic and adjacent regions only two, <i>C.</i> (<i>C.</i>) <i>lissosclera</i> Bergquist & Fromont, 1988 and <i>C.</i> (<i>C.</i>) <i>pauper</i> Brøndsted, 1927, possess two distinct categories of toxa.</p> <p> <i>Clathria lissosclera</i> can be distinguished as its megascleres are much smaller (choanosomal styles 170–190 µm and echinating acanthostyles 85–110 µm). <i>Clathria pauper</i> was originally described as having no microscleres (hence the name). Brøndsted (1927) describes basally spined acanthostyles up to 650 by 20 µm, as well as entirely spined acanthostyles up to 250 by 12 µm, and no microscleres. Hooper (1996) re-examined a fragment of the holotype (BMNH1930.11.5.2) and noted that toxas were in fact present. He gives the spicule dimensions as: principal styles with rounded smooth or microspined bases 372(606)810 by 11(15.8) 21 µm; Subectosomal styles 352(481)590 by 3(7.6) 10 µm; Echinating acanthostyles, subtylote with heavily spined base and lighter spined shaft 219(293)384 by 10(12.3) 15 µm; smaller evenly spined acanthostyles 92(148)183 by 5(8.4) 11 µm; Accolada toxas 93(139.5)185 by 0.8(0.9) 1.5 µm; wing-shaped toxas 31(45.5)52 by 1.5(1.7)2.0 µm). Our re-measurements of the type specimen agree with these. Our specimen differs from <i>C. pauper</i> in only having one category of evenly spined echinating acanthostyles, larger oxhorn toxas, and much longer principal styles.</p> <p> <b>Distribution.</b> Currently only known from the type and holotype localities.</p>Published as part of <i>Goodwin, Claire E., Berman, Jade & Hendry, Katharine R., 2019, Demosponges from the sublittoral and shallow-circalittoral (<24 m depth) Antarctic Peninsula with a description of four new species and notes on in situ identification characteristics, pp. 461-508 in Zootaxa 4658 (3)</i> on pages 487-488, DOI: 10.11646/zootaxa.4658.3.3, <a href="http://zenodo.org/record/3376028">http://zenodo.org/record/3376028</a>
Protein-RNA interactions: a structural analysis
No full textA detailed computational analysis of 32 protein-RNA complexes is presented. A number of physical and chemical properties of the intermolecular interfaces are calculated and compared with those observed in protein-double-stranded DNA and protein-single-stranded DNA complexes. The interface properties of the protein-RNA complexes reveal the diverse nature of the binding sites. van der Waals contacts played a more prevalent role than hydrogen bond contacts, and preferential binding to guanine and uracil was observed. The positively charged residue, arginine, and the single aromatic residues, phenylalanine and tyrosine, all played key roles in the RNA binding sites. A comparison between protein-RNA and protein-DNA complexes showed that whilst base and backbone contacts (both hydrogen bonding and van der Waals) were observed with equal frequency in the protein-RNA complexes, backbone contacts were more dominant in the protein-DNA complexes. Although similar modes of secondary structure interactions have been observed in RNA and DNA binding proteins, the current analysis emphasises the differences that exist between the two types of nucleic acid binding protein at the atomic contact level
Composite PEOn:NaTFSI polymer electrolyte: Preparation, thermal and electrochemical characterization
No full textMembranes of sodium bis(trifluoromethanesulfonate) imide (NaTFSI) complexed with poly(ethylene oxide) (PEO) salt have been prepared by a solvent-free hot-pressing technique with different EO:Na molar ratio. All membranes show good ionic conductivities in the range of 10(-3) S cm(-1) above 70 degrees C. However, the more NaTFSI-concentrated samples are sticky gums due to the plasticizing nature of the anion. The PEO20:NaTFSI sample exhibits the compromise of conductivity, thermal and mechanical properties. The addition of nanometric SiO2 to the PEO20:NaTFSI membranes further enhances their mechanical properties. Moreover, the PEO20:NaTFSI + 5 wt.% SiO2 membranes show similar ionic conductivity and similar anodic electrochemical stability in comparison to the ceramic free PEO20:NaTFSI sample. In a Na-(s)/polymer electrolyte/Na-(s) symmetrical cell followed up to 30 days, the presence of the ceramic filler slightly increased the interface resistance in comparison to the ceramic-free membrane. Nuclear magnetic resonance determinations of anion diffusion coefficients and Na+ mobility suggest that presence of filler may have a positive affect on the cation transference number that is in accordance with the t(Na)(+) transference number measurement. (C) 2013 Elsevier B.V. All rights reserved
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