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566 results on '"Kempe R"'

58. Unusual coordination mode for 1,3-diphosphete ligands towards a Cr–Cr quintuple bond complex.

Author

Elsayed Moussa, M., Rummel, E.-M., Balázs, G., Riesinger, C., Noor, A., Kempe, R., and Scheer, M.

Subjects
METAL-metal bonds, MONOMERS
Abstract

The reaction of LCr5_;CrL (L = N2C25H29, 1) with the phosphaalkynes R–C≡P (R = tBu, Me, Ad) yields the neutral dimerisation compounds [L2Cr2(μ,η1:η1:η2:η2-P2C2R2)] (R = tBu (2), Me (3)) and the tetrahedrane complex [L2Cr2(μ,η2:η2-P＝CAd)] (4). The 1,3-diphosphete ligands in complexes 2 and 3 are the first to possess this structural feature spanned over a metal–metal multiple bond, while the slightly bigger adamantyl phosphaalkyne remains a monomer in 4 with a side-on coordination mode. [ABSTRACT FROM AUTHOR]

Published
2023
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59. Single-step genomic prediction for metabolic body weight of Nordic Red dairy cattle

Author

Kempe, R M, Mehtiö, T., Leino, A.-M., Koivula, M, Pitkänen, T. J., Stephansen, Rasmus Bak, Mäntysaari, P., Negussie, E, Pösö, J, Nielsen, Ulrik S, Fikse, W.F., Aamand, G P, and Lidauer, M H

Abstract

The aim of this study was to predict genomic breeding values for metabolic body weight (MBW) by a single-step model and to compare obtained breeding values to those from a multistep genomic prediction model and a pedigree-based BLUP model. Data contained over 3 million observations from Danish, Finnish and Swedish Red dairy cattle born in the years 1990 to 2017. The applied multiple-trait animal models included six traits: 1st, 2nd, and 3rd parity MBW, and first parity stature, chest width and body depth. Breeding values from the singlestep model were in good agreement with those from the multi-step model (correlations were 0.98-0.99), but BLUP breeding values differed from genomic breeding values slightly for bulls and clearly for cows. The single-step model gave higher validation reliabilities for bulls and cows than the multi-step model. The results support using a single-step approach for the genomic evaluation of MBW.

Published
2022

61. Goitre in Pregnancy in Germany

Author

Bauch, K., Einenkel, D., Alexander, W., Grosse, E., Becker, J., Kibbassa, J., Kempe, R., Seitz, W., Rockel, A., Waller, H., Wölfer, H. u. J., Thomser, J., Delange, F., editor, Dunn, J. T., editor, and Glinoer, D., editor

Published
1993
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65. Pathophysiological Changes in the Enteric Nervous System of Rotenone-Exposed Mice as Early Radiological Markers for Parkinson's Disease

Author

Schaffernicht, G., Shang, Q., Stievenard, A., Bötzel, K., Dening, Y., Kempe, R., Toussaint, M., Gündel, D., Kranz, M., Reichmann, H., Vanbesien-Mailliot, C., Brust, P., Dieterich, M., Funk, R. H. W., Ravens, U., Pan-Montojo, F., Schaffernicht, G., Shang, Q., Stievenard, A., Bötzel, K., Dening, Y., Kempe, R., Toussaint, M., Gündel, D., Kranz, M., Reichmann, H., Vanbesien-Mailliot, C., Brust, P., Dieterich, M., Funk, R. H. W., Ravens, U., and Pan-Montojo, F.

Abstract

Parkinson's disease (PD) is known to involve the peripheral nervous system (PNS) and the enteric nervous system (ENS). Functional changes in PNS and ENS appear early in the course of the disease and are responsible for some of the non-motor symptoms observed in PD patients like constipation, that can precede the appearance of motor symptoms by years. Here we analyzed the effect of the pesticide rotenone, a mitochondrial Complex I inhibitor, on the function and neuronal composition of the ENS by measuring intestinal contractility in a tissue bath and by analyzing related protein expression. Our results show that rotenone changes the normal physiological response of the intestine to carbachol, dopamine and electric field stimulation (EFS). Changes in the reaction to EFS seem to be related to the reduction in the cholinergic input but also related to the noradrenergic input, as suggested by the non-adrenergic non-cholinergic (NANC) reaction to the EFS in rotenone-exposed mice. The magnitude and direction of these alterations varies between intestinal regions and exposure times and is associated with an early up-regulation of dopaminergic, cholinergic and adrenergic receptors and an irregular reduction in the amount of enteric neurons in rotenone-exposed mice. The early appearance of these alterations, that start occurring before the substantia nigra is affected in this mouse model, suggests that these alterations could be also observed in patients before the onset of motor symptoms and makes them ideal potential candidates to be used as radiological markers for the detection of Parkinson's disease in its early stages.

Published
2021

70. Urbanization In The Commonwealth Caribbean

Author

Kempe R Hope and Kempe R Hope

Subjects
Rural-urban migration--West Indies, British, Urban policy--West Indies, British, Cities and towns--West Indies, British--Growth, Economic development
Abstract

Focusing on Barbados, Trinidad and Tobago, Jamaica, and Guyana, Professor Hope examines the determinants and socioeconomic consequences associated with urban population growth. He documents demographic trends in the region, examines government policies that inadvertently encourage urbanization, and discusses the effects of too-rapid growth on urban

Published
2019

72. Development Policy In Guyana : Planning, Finance, And Administration

Author

Kempe R. Hope and Kempe R. Hope

Subjects
Finance, Public--Guyana
Abstract

This study of Guyana's economy, both analytical and empirical, examines the literature on development policy and applies various theoretical frameworks to data acquired in Guyana since 1945, Dr. Hope considers planning, finance, and administration, seeking to determine whether the Guyana government's development policy has been an instrument of eco

Published
2018

73. Social Change and Rural Regional Community Development in the United States.

Author

Hope, Kempe R.

Abstract

Examines the perspectives and dimensions of social change and community development in rural United States. Argues that the causes of poverty must be reconceptualized, and emphasis placed on long-range institutionalized programs of community services, training, and citizen participation. (SK)

Published
1980

80. Preceramic Polymer Chemistry: Toward the Design of Non-Oxide Ceramic-based Nanocomposites

Author

Proust, V., Lale, A., Motz, G., Kempe, R., Demirci, Umit, Bernard, Samuel, Herrada, Anthony, Institut Européen des membranes (IEM), and Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)

Subjects
[CHIM] Chemical Sciences, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2015

88. Crystal structure of (��4-cycloocta-1,5-dien)(1,2-bis(diethylphosphino)-ethane)rhodium(I) tetrafluoroborate, [Rh(C8H12(C10H24P2)]BF4)

Author

Kempe, R., Spannenberg, A.., Heller, D., and Drexler, H.-J.

Subjects
Chemistry, Crystal structure
Abstract

C18H36BF4P2RI1, monoclinic, P121/n1 (no. 14), a = 15.522(3) ��, b = 9.173(2) ��, c = 15.862(3) ��, �� = 103.91(3)��, V= 2192.3 ��3, Z = 4, Rgt(F) = 0.037, wRref(F2) = 0.087, T=200 K.

Published
2004
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