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Search Results: 1 - 10 of 208877 matches for " Rudy L. Luck "
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2-[(1-{[3-(dimethylazaniumyl)propyl]methylamino}ethylidene)azaniumyl]nonahydro-closo-decaborate dimethyl sulfoxide disolvate
Thomas D. Getman,Rudy L. Luck,Caitlin Cienkus
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811020186
Abstract: The title compound, 2-B10H9NH=C(CH3)N(CH3)CH2CH2CH2N(CH3)2H·2C2H6OS or C8H29B10N3·2C2H6OS, is zwitterionic with the negative charge localized on the decaborate cage and the positive charge on the terminal ammonium group. Two molecules of dimethyl sulfoxide (DMSO) and one molecule of the title compound constitute the asymmetric unit. One DMSO molecule is disordered [ratio 0.739 (3):0.261 (3)]. The bonds and angles within the decaborate cage are within the normal ranges. The amidine fragment of the ligand, which is expected to be planar, is significantly distorted from planarity as exemplified by four torsion angles [B—N—C—C = 8.4 (3), H—N—C—N = 5(2), N—C—N—C = 7.3 (3) and C—C—N—C = 14.8 (3)°] found within this portion of the molecule. The crystal packing consists of head-to-tail-arranged dimers of the title molecule held together by four molecules of DMSO which are attached via strong N—H...O and weak C—H...O hydrogen bonds.
tert-Butyl 2-benzoyl-2-methylpropanoate
Marshall W. Logue,Rudy L. Luck,Nicklaus S. Maynard,Sandra S. Orlowski
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810003120
Abstract: The title compound, C15H20O3, is bent with a dihedral angle of 67.28 (9)° between the mean planes of the phenyl ring and a group encompassing the ester functionality (O=C—O—C). In the crystal, molecules related by inversion symmetry are connected by weak C—H...O interactions into infinite chains. On one side of the molecule there are two adjacent interactions between neighbouring molecules involving the H atoms of methyl groups from the dimethyl groups and the O atoms of the ketone; on the other side, there are also two interactions to another adjacent molecule involving the H atoms on the phenyl rings and the carbonyl O atoms of the ester functionality.
tert-Butyl 2-methyl-2-(4-nitrobenzoyl)propanoate
Chelsey M. Crosse,Marshall W. Logue,Rudy L. Luck,Louis R. Pignotti
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810003119
Abstract: The title compound, C15H19NO5, is bent with a dihedral angle of 61.8 (2)° between the mean planes of the benzene ring and a group encompassing the ester functionality (O=C—O—C). The dihedral angle of 0.8 (2)° between the mean planes of the nitro group and the benzene ring indicates near coplanarity. In the crystal, each molecule is linked to four adjacent molecules by weak C—H...O hydrogen-bonding interactions. Both benzene H atoms ortho to the ketone O atom form C—H...O hydrogen bonds with the keto O atoms of two neighboring molecules (of the keto and ester groups, respectively), and the two other interactions involve the H atoms from a methyl group of the dimethyl residue, displaying C—H...O interactions with the O atoms of the nitro groups. These four interactions for each molecule lead to the formation of two-dimensional sheets with a hydrophilic interior, held together by weak hydrogen-bonded interactions, and a hydrophobic exterior composed of protruding methyl groups which interstack with the methyl groups in adjacent sheets.
tert-Butyl 2-methyl-2-(4-methylbenzoyl)propanoate
Graham B. Gould,Brock G. Jackman,Marshall W. Logue,Rudy L. Luck
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810003144
Abstract: The title compound, C16H22O3, is bent with a dihedral angle of 75.3 (1)° between the mean planes of the benzene ring and a group encompassing the ester functionality (O=C—O—C). In the crystal, the molecules are linked into infinite chains held together by weak C—H...O hydrogen-bonded interactions between an H atom on the benzene ring of one molecule and an O atom on the ketone functionality of an adjacent molecule. The chains are arranged with neighbouring tert-butyl and dimethyl groups on adjacent chains exhibiting hydrophobic stacking, with short C—H...H—C contacts (2.37 ) between adjacent chains
tert-Butyl 2-(4-chlorobenzoyl)-2-methylpropanoate
Chelsey M. Crosse,Emily C. Kelly,Marshall W. Logue,Rudy L. Luck
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810003156
Abstract: The title compound, C15H19ClO3, is bent with a dihedral angle of 72.02 (9)° between the mean planes of the benzene ring and a group encompassing the ester functionality (O=C—O—C). In the crystal, molecules related by inversion symmetry are connected by weak C—H...O interactions into infinite chains. These interactions involve H atoms from a methyl group of the dimethyl residue and the O atoms of the ketone on one side of a molecule; on the other side there are interactions between H atoms of the benzene ring and the carbonyl O atoms of the ester functionality. There are no directional interactions between the chains.
Evaluation of the Impact of Laparoscopic Supracervical Hysterectomy for the Treatment of Adenomyosis on Pain Intensity and Patient Satisfaction  [PDF]
Garri Tchartchian, Harald Krentel, Bernd Bojahr, Rudy L. De Wilde
Surgical Science (SS) , 2018, DOI: 10.4236/ss.2018.912059
Abstract: Objectives. Common symptoms of adenomyosis include pain and bleeding disorders and can severely impact a patient’s quality of life. Few studies report on the impact of hysteroscopy procedures on improving these symptoms. This study evaluates the effect of laparoscopic supracervical hysterectomy (LASH) in adenomyosis patients on pain in general, pain during intercourse, bleeding disorders and general satisfactoriness of the procedure. Methods. This prospective observational single-arm, single-center study included 256 patients treated with LASH and whose histological analysis revealed adenomyosis. Other inclusion criteria were completed family planning and no more symptom relief with conservative therapy. They completed questionnaires before and after the procedure which evaluated pain in general, pain during intercourse, bleeding disorders and general satisfactoriness of the procedure. Results. Our results showed a significant (p < 0.0001) reduction of pain (from 1261 to 428 pain points), dyspareunia (from 763 to 224 pain points) and bleeding dis-orders when compared before and after LASH treatment. Furthermore, we found a high satisfaction rate of 98.4%. Conclusion. As a minimal invasive procedure associated with low major complication rates, LASH is a qualified therapeutic choice to treat pain and bleeding disorders in adenomyosis patients with completed family planning and in where conservative therapy failed.
Effect of temperature on the development and thermal requirements of Wolbachia-infected and antibiotically cured Trichogramma kaykai Pinto and Stouthamer (Hymenoptera: Trichogrammatidae)
Hohmann, Celso L.;Luck, Robert F.;
Anais da Sociedade Entomológica do Brasil , 2000, DOI: 10.1590/S0301-80592000000300012
Abstract: the development times and the thermal requirements of wolbachia-infected and antibiotically cured trichogramma kaykai pinto and stouthamer (hymenoptera: trichogrammatidae), using trichoplusia ni hübner (lepidoptera: noctuidae) eggs, were assessed at four constant temperatures (15, 20, 25, and 30°c), 70 ± 5% rh, photophase 14 h. the knowledge of temperature effects are very important in helping understand the dynamics of desert organisms like t. kaykai that face extreme temperatures during the season. cured wasps developed faster at higher temperatures (20, 25, and 30°c) than infected wasps. however, infected wasps developed faster at the lowest temperature (15°c) than cured wasps. developmental times of cured and infected wasps increased from 7.0 and 7.1 days at 30°c, respectively to 37.3 and 36.7 days at 15°c, respectively. males developed sooner than females at all temperatures. the developmental thresholds for the progeny of uninfected and infected t. kaykai were 12.0°c and the thermal requirement for development was 127.71 and 132.10 degree-days, respectively.
Effect of host availability and egg load in Trichogramma platneri Nagarkatti (Hymenoptera: Trichogrammatidae) and its consequences on progeny quality
Hohmann, Celso L.;Luck, Robert F.;
Brazilian Archives of Biology and Technology , 2004, DOI: 10.1590/S1516-89132004000300012
Abstract: experiments were conducted to determine whether trichogramma platneri nagarkatti manifested a somatic-gametic trade-off and whether it was affected by host availability and host size. large wasps produced on trichoplusia ni hübner and limited to five or 15 t. ni eggs daily, produced a similar number of progeny as wasps offered hosts from emergence. similar results were obtained when they were deprived of t. ni eggs for one, three, five, or ten days and then provided with unlimited hosts daily until death. in contrast, small wasps produced from sitotroga cerealella (olivier) and deprived of t. ni eggs for one to three days suffered a significant reduction in progeny production. regardless of size, the egg load of non-ovipositing wasps increased significantly with time and a positive relationship existed between the life span of a female and the length of time she was deprived of hosts.
The Distribution of the Elements in the Galactic Disk III. A Reconsideration of Cepheids from l = 30 to 250 Degrees
R. Earle Luck,David L. Lambert
Physics , 2011, DOI: 10.1088/0004-6256/142/4/136
Abstract: This paper reports on the spectroscopic investigation of 238 Cepheids in the northern sky. Of these stars, about 150 are new to the study of the galactic abundance gradient. These new Cepheids bring the total number of Cepheids involved in abundance distribution studies to over 400. In this work we also consider systematics between various studies and also those which result from the choice of models. We find systematic variations exist at the 0.06 dex level both between studies and model atmospheres. In order to control the systematic effects our final gradients depend only on abundances derived herein. A simple linear fit to the Cepheid data from 398 stars yields a gradient d[Fe/H]/dRG = -0.062 \pm 0.002 dex/kpc which is in good agreement with previously determined values. We have also reexamined the region of the "metallicity island" of Luck et al. (2006). With the doubling of the sample in that region and our internally consistent abundances, we find there is scant evidence for a distinct island. We also find in our sample the first reported Cepheid (V1033 Cyg) with a pronounced Li feature. The Li abundance is consistent with the star being on its red-ward pass towards the first giant branch.
Dynamics of a quantum particle in low-dimensional disordered systems with extended states
P. L. Krapivsky,J. M. Luck
Statistics , 2011, DOI: 10.1088/1742-5468/2011/02/P02031
Abstract: We investigate the dynamics of a quantum particle in disordered tight-binding models in one and two dimensions which are exceptions to the common wisdom on Anderson localization, in the sense that the localization length diverges at some special energies. We provide a consistent picture for two well-known one-dimensional examples: the chain with off-diagonal disorder and the random-dimer model. In both cases the quantum motion exhibits a peculiar kind of anomalous diffusion which can be referred to as bi-fractality. The disorder-averaged density profile of the particle becomes critical in the long-time regime. The $q$-th moment of the position of the particle diverges with time whenever $q$ exceeds some $q_0$. We obtain $q_0=2$ for off-diagonal disorder on the chain (and conjecturally on two-dimensional bipartite lattices as well). For the random-dimer model, our result $q_0=1/2$ corroborates known rigorous results.
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