Response of Feedlot Lambs to Chlortetracycline and Sulfamethazine

The objective of this experiment was to test the effects of chlortetracycline and sulfamethazine alone and in combination on feedlot performance and incidence of diseases of lambs weaned at an early age, shipped and finished in drylot with a high-concentrate ration

Synthesis and spectral studies of 5-[3-(1,2,4-triazolyl-azo]-2,4-dihydroxybenzaldehyde(TA)and its Schiff bases with 1,3-diaminopropane(TAAP)and 1,6-diaminohexane(TAAH).Their analytical application for spectrophotometric microdetermination of cobalt(II).

Cataloged from PDF version of article.The new azo compound 5-[3-(1,2,4-triazolyl-azo]-2,4-dihydroxy-benzaldehyde (TA) and its Schiff bases with 1,3-diaminopropane (TAAP) and 1,6-diaminohexane (TAAH) have been synthesized. The bands of diagnostic importance in the IR and the main signals in 1 H NMR spectra are assigned. The electronic absorption spectra in pure organic solvents of different polarity and in buffer solutions of varying pH are investigated. The quantitative description of the solvent effect on the electronic absorption spectra is studied and their acid ionization constants are determined. Also, a new simple and sensitive method for the spectrophotometric microdetermination of Co(II) using these compounds (TA, TAAP and TAAH) as new chromogenic reagents is established. The developed method is successfully used for the determination of trace amounts of cobalt in authentic samples and calculation of the distribution ratio of cobalt adsorbed on bentonite and kaolinite clay minerals. 2004 Elsevier Ltd. All rights reserved

Diffusion on a hypercubic lattice with pinning potential: exact results for the error-catastrophe problem in biological evolution

In the theoretical biology framework one fundamental problem is the so-called error catastrophe in Darwinian evolution models. We reexamine Eigen's fundamental equations by mapping them into a polymer depinning transition problem in a ``genotype'' space represented by a unitary hypercubic lattice. The exact solution of the model shows that error catastrophe arises as a direct consequence of the equations involved and confirms some previous qualitative results. The physically relevant consequence is that such equations are not adequate to properly describe evolution of complex life on the Earth.Comment: 10 pages in LaTeX. Figures are available from the authors. [email protected] (e-mail address

La cysticercose bovine en milieu sédentaire et en milieu nomade

Les auteurs étudient, au Tchad, la cysticercose bovine en milieu sédentaire et en milieu nomade. Ils constatent qu'au Batha (Centre Tchad), il existe 4 fois plus d'animaux ladres chez les sédentaires que chez les nomades. Au Kanem (Ouest Tchad), la proportion est à peu près identique. Dans les 2 préfectures le taux d'infestation du bétail nomade est très voisin (environ 5 p. 100

Pseudomarshallagia elongata Roetti, 1941 (Nematoda : Trichostrongylida e), parasite de la caillette des petits ruminants d'Ethiopie

Les auteurs signalent, pour la seconde fois en Ethiopie, la présence, dans la caillette des moutons, de Pseudomarshallagia elongata Roetti, 1941. Le parasite est redécrit et le sous-genre Pseudomarshallagia est érigé en genre avec 2 espèces: Pseudomarshallagia thalae et Pseudomarshallagia elongat

Labor income dynamics and the insurance from taxes, transfers, and the family

What do labor income dynamics look like over the life-cycle? What is the relative importance of persistent shocks, transitory shocks and heterogeneous profiles? To what extent do taxes, transfers and the family attenuate these various factors in the evolution of life-cycle inequality? In this paper, we use rich Norwegian population panel data to answer these important questions. We let individuals with different education levels have a separate income process; and within each skill group, we allow for non-stationarity in age and time, heterogeneous experience profiles, and shocks of varying persistence. We find that the income processes differ systematically by age, skill level and their interaction. To accurately describe labor income dynamics over the life-cycle, it is necessary to allow for heterogeneity by education levels and account for non-stationarity in age and time. Our findings suggest that the redistributive nature of the Norwegian tax-transfer system plays a key role in attenuating the magnitude and persistence of income shocks, especially among the low skilled. By comparison, spouse's income matters less for the dynamics of inequality over the life-cycle

From product dispensing to patient care: The role of the pharmacist in providing pharmaceutical care as part of an integrated disease management approach

During the past decade, the profession of pharmacy has changed dramatically. The Doctor of Pharmacy degree has replaced the Bachelor of Science degree as the first professional degree offered at most accredited U.S. pharmacy schools. Advanced clinical training is now a mainstay of pharmacy training, and this has enabled pharmacists to contribute to disease management efforts. In addition, technological improvements in prescription processing have afforded pharmacists more time to participate in disease management activities. This paper describes how the role of the pharmacist has changed and reviews the results of programs involving pharmacists as disease management providers in the areas of asthma, hypertension, diabetes, and hyperlipidemia. Pharmacists\u27 contributions in various practice settings are also discussed

Imaging nonequilibrium atomic vibrations with x-ray diffuse scattering

For over a century, x-ray scattering has been the most powerful tool for determining the equilibrium structure of crystalline materials. Deviations from perfect periodicity, for example due to thermal motion of the atoms, reduces the intensity of the Bragg peaks as well as produces structure in the diffuse scattering background. Analysis of the thermal diffuse scattering (TDS) had been used to determine interatomic force constants and phonon dispersion in relatively simple cases before inelastic neutron scattering became the preferred technique to study lattice dynamics. With the advent of intense synchrotron x-ray sources, there was a renewed interest in TDS for measuring phonon dispersion. The relatively short x-ray pulses emanating from these sources also enables the measurement of phonon dynamics in the time domain. Prior experiments on nonequilibrium phonons were either limited by time-resolution and/or to relatively long wavelength excitations. Here we present the first images of nonequilibrium phonons throughout the Brillouin zone in photoexcited III-V semiconductors, indium-phosphide and indium-antimonide, using picosecond time-resolved diffuse scattering. In each case, we find that the lattice remain out of equilibrium for several hundred picoseconds up to nanoseconds after laser excitation. The non-equilibrium population is dominated by transverse acoustic phonons which in InP are directed along high-symmetry directions. The results have wide implications for the detailed study of electron-phonon and phonon-phonon coupling in solids.Comment: 10 pages, 3 figure

Helminthes des animaux sauvages d'Ethiopie. I. Mammifères

Les auteurs étudient une collection de parasites de mammifères sauvages tirés à la chasse dans le Sud et dans le Centre de l'Ethiopie entre 1973 et 1978, collection qui comprend 46 espèces différentes dont une nouvelle pour la science, Nilocotyle duplicisphinctris et 33 nouvelles pour l'Ethiopie. Quatorze d'entre elles sont communes aux mammifères domestiques et aux mammifères sauvages. L'importance de ces helminthes et leur répercussion sur le maintien de certains herbivores, rares et localisés au plateau éthiopien, sont discutée

Enquêtes sur les helminthes du dromadaire tchadien. Etude des strongyloses gastro-intestinales et de l'haemoncose à Haemoncus longistipes

Les auteurs ont procédé dans les zones Nord de la République du Tchad, au-delà du 13e parallèle, à l'autopsie de 132 dromadaires et à de nombreux examens hématologiques et coproscopiques. Les parasites rencontrés comprennent 22 espèces appartenant à 17 genres différents. Les plus fréquentes sont, dans l'ordre décroissant: Cephalopina titillator (72,6 p. 100), Haemonchus longistipes (72 p. 100), divers Anoplocephalidae agents du téniasis (47,1 p. 100), les Kystes d'Echinococcus granulosus (35,6 p. 100), Buckleyuris globulosa (34,8 p. 100), Oesophagostomum columbianum (28 p. 100), Strongyloides papillosus (22,7 p. 100) et de nombreux Trichostrongylidae et Heligmosomatidae (14,4 p. 100) Trichostrongylus vitrinus; Trichostrongylus probolurus; Impalaia nudicollis). Ces parasites sont associés dans 85 p. 100 des cas notamment avec Nématodes gastro-intestinaux. Ils agissent: - en prélevant du sang; - en modifiant certains métabolismes; - en irritant la muqueuse intestinale. Bien souvent helminthes et trypanosomes sont associés. Le taux de morbidité oscille autour de 90-100 p. 100. La mortalité annuelle est estimée à 4 p. 100 dans certaines zones du Nord-Est de la Républiqu