601
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Thomas DL, Quick MP, Morgan RP. Suspected foxglove (Digitalis purpurea) poisoning in a dairy cow. Vet Rec 1987; 120:300-1. [PMID: 3590565 DOI: 10.1136/vr.120.13.300] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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602
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Little HJ, Thomas DL. The effects of anaesthetics and high pressure on the responses of the rat superior cervical ganglion in vitro. J Physiol 1986; 374:387-99. [PMID: 3746696 PMCID: PMC1182727 DOI: 10.1113/jphysiol.1986.sp016086] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The effects of helium pressure and of general anaesthetics were studied on the responses of the isolated superior cervical ganglion of the rat, to determine how far these reflected the pressure reversal of anaesthesia seen in vivo. The method of Brown & Marsh (1974) for extracellular recording of surface potentials was adapted for use in a high-pressure chamber. Helium alone, at 130 atm, did not alter the responses of the ganglion to gamma-aminobutyric acid (GABA) but significantly depressed the depolarizing and hyperpolarizing components of the nicotinic responses, and the muscarinic responses. The potentiation of the responses to GABA caused by pentobarbitone was not altered by the application of helium, at 130 atm. This pressure also decreased further the nicotinic responses which were depressed by pentobarbitone. Nitrogen, at 34 atm (the anaesthetic ED50 in vivo) and at 68 atm, significantly decreased the nicotinic responses of the ganglia, and the addition of helium to a total of 130 atm further increased this depression. At pressures of 3.3-68 atm, nitrogen caused small decreases in the responses to GABA. Nitrous oxide at 1.5 atm (the ED50 for loss of righting reflex in mice) and at 3 atm, significantly depressed the responses to GABA and to the nicotinic agonist, but did not alter the responses to methylfurmethide. The effects of nitrous oxide were unaltered when helium was added to a total of 130 atm, although this pressure of helium added alone significantly depressed the cholinergic responses. A mixture of 50% nitrous oxide and 50% oxygen, when added to the pressure chamber, at normal atmospheric pressure, caused transient increases in the responses to GABA. The effects of temperature on GABA responses and on nicotinic responses were very different from those of pressure. Preliminary evidence suggested that raising the temperature may decrease the extent of potentiation of GABA responses by pentobarbitone. The results are discussed in relation to the pressure reversal of anaesthesia in vivo. It was concluded that there was no evidence that the basis of this interaction lay in the potentiation of GABA responses by general anaesthetics, or the depression of cholinergic responses, although the changes seen were not in all cases simply additive. It was considered that effects of general anaesthetics such as the potentiation of GABA may contribute to the effects used to measure general anaesthesia in vivo, such as loss of righting reflex, but may not be related to the non-specific actions which cause anaesthesia.
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603
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Denzer LE, Thompson LH, McKeith FK, Parrett DF, Thomas DL. Evaluation of growth, carcass traits and reproductive organs of young boars in response to zeranol implantation. J Anim Sci 1986; 62:1164-71. [PMID: 3722008 DOI: 10.2527/jas1986.6251164x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Two experiments were conducted to evaluate the effect of implants containing zeranol on growth rate, carcass composition, palatability and reproductive organ development of intact male pigs. In Exp. 1, three treatment groups were evaluated: control barrows, intact control boars and implanted boars (implanted at either 28, 56 or 112 d of age with one 12-mg dose of zeranol). In Exp. 2, four treatment groups were evaluated: control barrows, intact control boars, boars implanted at 28 d with 24 mg of zeranol (single implant) and boars implanted at 28 d and re-implanted at 56 and 112 d of age with 24 mg of zeranol (triple implant). Differences for average daily gain and carcass traits were not consistent between treatment groups with the exception of 10th rib fat, where barrows were fatter than boars. There were no differences among treatments due to zeranol for the reproductive organ characteristics, with the exception that bulbourethal gland and teat weights were heavier for boars in Exp. 2. Penis weights and lengths were lower for barrows in both experiments. Juiciness, tenderness, Warner-Bratzler shear force, pork flavor intensity and sensory scores were not consistently affected by male condition or zeranol treatment. In two of the three comparisons, implanted boars had higher off-flavor intensity scores in Exp. 1, but no treatment difference was observed in Exp. 2. Zeranol implantation did not result in significant changes in growth rate, development of reproductive organs or carcass characteristics of young boars.
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604
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Saoud NB, Thomas DL, Hohenboken WD. Breed and sire effects on crossbred lamb production from Panama ewes and on spermatozoan midpiece length. J Anim Sci 1984; 59:29-38. [PMID: 6746454 DOI: 10.2527/jas1984.59129x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Three-hundred mature Panama-type range ewes were mated to Clun Forest, Dorset, Border Leicester, Polypay and Suffolk rams during the 1979 and 1980 breeding seasons. Sire breed and ram within breed effects on lamb growth, ewe reproduction, spermatozoan midpiece length (MPL) and midpiece length coefficient of variation (MPLCV) were examined. Associations among MPL and MPLCV and economically important traits also were assessed. Suffolk-sired lambs weighted .18, 2.0 and 1.5 kg more, at birth, weaning and post-weaning, respectively, than the average of all groups. Dorset-sired lambs had the lightest postweaning weight. Variation was greatest among Suffolk rams for average weaning and postweaning weights of their progeny. The Border Leicester breed had the least among ram variation for progeny weaning weight; while variation among Dorset rams was least for progeny postweaning weight. Fertility (ewes lambing/ewe exposed) and prolificacy (lambs born/ewe lambing) of the rams' mates were not influenced significantly by sire breed. Lamb mortality also was not influenced by breed of sire nor by rams within a breed. For variation in MPL, 26.4% was due to the breed effect (P less than or equal to .01) and 21.6% was attributable to ram variation within a breed (P less than or equal to .01). Clun Forest rams had the longest average MPL and greatest MPLCV, while Dorsets had the shortest MPL and smallest MPLCV. There were no important associations between either MPL or MPLCV and any of the economic traits.
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605
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Tatham TR, Thomas DL, Danila DJ. Fishes of Barnegat Bay. ECOLOGY OF BARNEGAT BAY, NEW JERSEY 1984. [DOI: 10.1029/ln006p0241] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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606
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Sheggeby G, Thomas DL, Craig AM. Thin-layer agarose isoelectric focusing: an improved technique for determining sheep hemoglobin type. J Anim Sci 1983; 57:559-64. [PMID: 6630093 DOI: 10.2527/jas1983.573559x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
An improved technique for rapid screening of sheep flocks for hemoglobin (Hb) type is presented. This technique, isoelectric focusing (IEF) on thin-layer agarose gels is simple, rapid, inexpensive and is suitable for screening large numbers of sheep for Hb type. With this technique, up to 100 sheep blood samples can be prepared, tested and interpreted within 2 h after samples are drawn. The new technique was shown to provide better resolution than polyacrylamide gel electrophoresis (PAGE) and was able to resolve samples in which the Hb had become partially degraded. These same samples could not be resolved by PAGE. The use of a special electroendosmosis-free grade of agarose provided resolution essentially equal to polyacrylamide as a matrix for IEF. The advantages are that the casting of the agarose gels is considerably easier, the focusing of samples is more rapid, staining and destaining times are greatly reduced and hazards from potential neurotoxicity of acrylamide are eliminated. Blood from 138 ewes at the Oregon State University Sheep Center was examined by the new agarose IEF technique to determine and demonstrate its usefulness for screening. No difficulty was encountered with interpretation of any of the samples. Frequencies of the HbA and B alleles were similar to those found in earlier studies when polyacrylamide tube gel electrophoresis was used. The observed frequencies were also similar to those expected with the population in Hardy-Weinberg equilibrium.
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607
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Lamberson WR, Thomas DL, Rowe KE. The Effects of Inbreeding in a Flock of Hampshire Sheep2. J Anim Sci 1982. [DOI: 10.2527/jas1982.554780x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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608
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Lamberson WR, Thomas DL. Effects of season and bread of sire on incidence of estrus and ovulation rate in sheep. J Anim Sci 1982; 54:533-9. [PMID: 6211425 DOI: 10.2527/jas1982.543533x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The effects of season and breed of sire on estrous activity and ovulation rate were estimated in 50 mature ewes, 10 each sired by North Country Cheviot, Dorset, Finnsheep, Romney and Suffolk rams and born from Suffolk dams. Estrus was checked with vasectomized rams from July 1979 through December 1980. From May through December of 1980, ovulation rate was determined by the counting of corpora lutea (CL) during laparoscopic examinations of ovaries. A breed X month interaction (p less than .01) was found for incidence of estrus. Finnsheep-sired ewes were slower to enter anestrus and had the shortest anestrus period. Cheviot-sired ewes had the longest anestrus period. Ovulation rate, measured as the number of CL/ewe examined per month from August through December of 1980, was highest (P less than .05) in October and November. Finnsheep-sired ewes tended to have higher ovulation rates (2.04) per ewe ovulating than did Romney-or Cheviot-sired ewes (1.48). Suffolk- and Dorset-sired ewes were intermediate. Ovulation rate, measured as the number of CL/ewe available per month from May through December of 1980, was highest (P less than .05) in September, October and November. Suffolk-, Finnsheep- and Dorset-sired ewes had higher (P less than .10) ovulation rates (.95) per ewe available than did Romney- and Cheviot-sired ewes (.67). Monthly repeatability of ovulation rate from August through December of 1980 was .41 +/- .25.
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609
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Dally MR, Hohenboken W, Thomas DL, Craig AM. Relationships between hemoglobin type and reproduction, lamb, wool and milk production and health-related traits in crossbred ewes. J Anim Sci 1980; 50:418-27. [PMID: 7364678 DOI: 10.2527/jas1980.503418x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Relationships among hemoglobin (Hb) types and production traits were examined in 294 crossbred ewes from North Country Cheviot, Dorset, Finnsheep and Romney rams, and Suffolk and Columbia-type ewes. Hb BB ewe lambs were youngest at first estrus, while Hb AA ewe lambs were oldest. Ewe lamb fertility was similar for Hb AB and Hb BB ewes, and both were superior to Hb AA ewes. When Finnsheep crossbreds were excluded, from which Hb BB was absent, Hb BB ewes had higher ewe lamb fertility than did Hb AB ewes. There was a minor advantage of the A over the B allele in ewe lamb prolificacy. Hb BB ewes were highest, Hb AB ewes were intermediate and Hb AA ewes were lowest for average fertility, prolificacy per ewe lambing, lambs born per ewe exposed to mating, total number of lambs weaned and total kilograms of lamb weaned. Grease wool production, staple length, fiber diameter grade, incidence of medullated fibers and incidence of cotted fleeces all were similar across Hb types. Likewise, Hb type did not affect milk production or composition. Ewes with Hb AB had the lowest incidence of footrot; Hb AA and Hb BB ewes were similar. Ewes with Hb AA had the lowest fecal parasite egg counts, while ewes with Hb AB or Hb BB were similar. Ewes with Hb AA also had the lowest incidence of mastitis, Hb BB ewes were intermediate and Hb AB ewes were highest. The combination of overdominance (as for footrot resistance), beneficial effects of the A allele on health-related traits (as for mastitis and parasite resistance) and the beneficial effect of the B allele on reproductive traits, if real, could partly explain the genetic polymorphism commonly reported at the Hb locus in sheep.
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610
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Thomas DL. Individual practice association (IPA) model health maintenance organization (HMOs). ISSUES IN HEALTH CARE (PHILADELPHIA, PA.) 1979; 1:34-6. [PMID: 10255613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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611
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Thomas DL, Whiteman JV. Effects of Substituting Finnsheep and Dorset Breeding for Rambouillet Breeding. I. Productivity of Young, Spring-Lambing Ewes. J Anim Sci 1979. [DOI: 10.2527/jas1979.482256x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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612
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Thomas DL, Whiteman JV. Effects of Substituting Finnsheep and Dorset Breeding for Rambouillet Breeding II. Productivity of Fall-Lambing Ewes. J Anim Sci 1979. [DOI: 10.2527/jas1979.482265x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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613
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Thomas DL, Green GD. A vectorcardiograph for assessing implanted cardiac pacemakers. MEDICAL & BIOLOGICAL ENGINEERING 1974; 12:593-8. [PMID: 4465581 DOI: 10.1007/bf02477220] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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614
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Green GD, Thomas DL. Improvements in the technique of assessing implanted cardiac pacemakers. MEDICAL & BIOLOGICAL ENGINEERING 1974; 12:589-92. [PMID: 4465580 DOI: 10.1007/bf02477219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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615
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Gecas V, Calonico JM, Thomas DL. The development of self-concept in the child: mirror theory versus model theory. THE JOURNAL OF SOCIAL PSYCHOLOGY 1974; 92:67-76. [PMID: 4815684 DOI: 10.1080/00224545.1974.9923073] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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616
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Thomas DL, Torbet TE, Hansen S, Hay DM. A comprehensive system for monitoring the foetal heartrate and uterine contractions. MEDICAL & BIOLOGICAL ENGINEERING 1973; 11:703-9. [PMID: 4787929 DOI: 10.1007/bf02478658] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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617
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618
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619
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Thomas DL, Smith BA. Studies of Young of the Black Drum, Pogonias cromis, in Low Salinity Waters of the Delaware Estuary. ACTA ACUST UNITED AC 1973. [DOI: 10.2307/1350878] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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620
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Thomas DL, Green GD, Hannan WJ. A pacemaker digital electrocardiograph for accurate measurements of pacemaker pulse amplitude, width and rate in the assessment of implanted cardiac pacemakers. MEDICAL & BIOLOGICAL ENGINEERING 1972; 10:403-8. [PMID: 5043488 DOI: 10.1007/bf02474220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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621
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Etchells AH, Thomas DL, Young DG. Rippling mattress worked from compressed air supply. Arch Dis Child 1971; 46:733-5. [PMID: 5118071 PMCID: PMC1647835 DOI: 10.1136/adc.46.249.733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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622
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Thomas DL, Green GD, Hannan WJ. A pacemaker digital electrocardiogram for accurate assessment of implanted cardiac pacemakers. MEDICAL & BIOLOGICAL ENGINEERING 1971; 9:503-9. [PMID: 5159048 DOI: 10.1007/bf02474707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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623
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Weigert AJ, Thomas DL. Socialization and religiosity: a cross-national analysis of catholic adolescents. SOCIOMETRY 1970; 33:305-26. [PMID: 5532599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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624
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Thomas DL, Crumpacker DW. Dynamics of chromosomal polymorphism and genetic load: an application of the two-locus multiplicative model with heterosis. Genetics 1970; 64:367-85. [PMID: 5470485 PMCID: PMC1212407 DOI: 10.1093/genetics/64.2.367] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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625
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Thomas DL. Profile card system ensures safe handling of patients' medications. MODERN NURSING HOME 1968; 22:48-9. [PMID: 5189193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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