Evaluation of the nitrogen sufficiency index for use with high resolution,broadband aerial imagery in a commercial potato field   总被引：1，自引：0，他引：1  

Tyler J. Nigon  David J. Mulla  Carl J. Rosen  Yafit Cohen  Victor Alchanatis  Ronit Rud 《Precision Agriculture》2014,15(2):202-226

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Immunologic factors related to survival and performance in neonatal swine   总被引：1，自引：0，他引：1  

J W Tyler  J S Cullor  M C Thurmond  V L Douglas  K M Parker 《American journal of veterinary research》1990,51(9):1400-1406

Logistic regression was used to develop models predicting preweaning survival in 334 neonatal swine. Measured risk factors included birth weight, litter size (live born), dam parity, serum IgG concentration, serum ELISA titers recognizing common gram-negative core antigens, and serum concentrations of the third component of complement. Larger birth weights were associated with increased probability of preweaning survival. The highest mortality was observed in litters with more than 12 pigs. Pigs with serum concentration of the third component of complement (C3) in the lowest stratum, less than 20% adult pooled C3 standard (APC3), had reduced mortality, compared with high (greater than 38% APC3) and middle (20 to 38% APC3) groups. Associations between all other variables, including total serum IgG concentration and preweaning survival were not significant. Few pigs had hypogammaglobulinemia, less than 3% of the study population had serum IgG concentrations less than 1 g/dl. Of all measured variables, only birth weight and dam parity were significant predictors of preweaning gain. Larger pigs and pigs born to third or greater parity dams had more preweaning gain than other pigs.  相似文献   

Hydronephrosis and pyelonephritis associated with an anomalous vas deferens in a bull     

J W Tyler  B P Smith  J Irvine 《Journal of the American Veterinary Medical Association》1991,198(5):871-872

Hydronephrosis and pyelonephritis were diagnosed in a 2-year-old Limousin bull. Salient historical and clinical observations included weight loss, anorexia, intermittent colic, polyuria, polydypsia, and an ammoniacal breath odor. Intravenous treatment with fluids and antibiotics did not induce a favorable response. An anomalous vas deferens was observed on postmortem examination. The vas deferens ended in a blind polyp that protruded into the lumen of the urethra. This polyp may have caused chronic intermittent obstruction, predisposing to the hydronephrosis and pyelonephritis.  相似文献   

Association between cancer chemotherapy and canine distemper virus, canine parvovirus, and rabies virus antibody titers in tumor-bearing dogs.     

C J Henry  D L McCaw  K V Brock  A M Stoker  J W Tyler  D J Tate  M L Higginbotham 《Journal of the American Veterinary Medical Association》2001,219(9):1238-1241

OBJECTIVE: To determine the association between cancer chemotherapy and serum canine distemper virus (CDV), canine parvovirus (CPV), and rabies virus antibody titers in tumor-bearing dogs. DESIGN: Prospective study. ANIMALS: 21 client-owned dogs with various malignancies and 16 client-owned dogs with lymphoma. PROCEDURE: In study A, serum antibody titers were measured by use of hemagglutination inhibition (CPV titers) or serum neutralization (CDV titers) before and at least 1 month after initiation of chemotherapy. Baseline values were compared with values obtained from a control population of 122 healthy dogs seen for routine revaccination. Titers were considered protective at > or = 1:96 for CDV and > or = 1:80 for CPV. In study B, serum IgG titers were measured by use of immunofluorescent assay (CDV and CPV titers) and rapid fluorescent focus inhibition test (RFFIT, rabies titers) at baseline and again at weeks 5, 8, and 24 of a standard chemotherapy protocol for treatment of lymphoma. An IgG titer of > or = 1:50 was considered protective for CPV and CDV. An RFFIT titer of > or = 0.5 U/ml was considered protective for rabies virus. RESULTS: Significant changes were not detected in CDV, CPV, and rabies virus titers following chemotherapy in tumor-bearing dogs. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that established immunity to CDV, CPV, and rabies virus from previous vaccination is not significantly compromised by standard chemotherapy used to treat tumor-bearing dogs.  相似文献   

Inflorescence and seed production in festuca pratensis var. apennina (2n\t=28)     

E. W. Bean  B. F. Tyler 《Euphytica》1977,26(2):393-400

Summary Plants of tetraploid Festuca pratensis var. apennina (2n=28) collected from Switserland and Northern Italy produced few inflorescences when grown in the field and under glasshouse conditions. The effects of winter and spring treatments upon reproductive growth were investigated and it was concluded that exposure to low winter temperatures and the control of tiller density in the spring were two important factors controlling the production of inflorescences. A procedure for the production of seed is suggested which will allow breeders to obtain efficient multiplication of collected plant material.  相似文献   

Calcareous fens in south Sweden. Previous use,effects of management and management recommendations     

Carin Tyler 《Biological conservation》1984,30(1):69-89

A report written in the Swedish language has been abridged and rewritten for foreign readers. Each calcareous fen site is a unique feature though it is possible to generalise such fens into five types according to soil type and most frequent plant communities. Previously most fen sites were used for hay and/or grazing, which gradually decreased from the middle of the 19th century and, since the 1950s has become very unusual. The effects of different management practices are still insufficiently known, observations on species are often contradictory and hence experimental studies are needed. The future management should be adjusted to the sensitivity of each site, the fen type, the main plant communities and the purposes of the preservation.  相似文献   

Probing Titan's Surface     

Eshleman VR  Tyler GL  Simpson RA  Marouf EA 《Science (New York, N.Y.)》1984,223(4638):772

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Bistatic-radar detection of lunar scattering centers with lunar orbiter I     

Tyler GL  Eshleman VR  Fjeldbo G  Howard HT  Peterson AM 《Science (New York, N.Y.)》1967,157(3785):193-195

Continuous-wave signals transmitted from Lunar Orbiter I have been received on Earth after they have been reflected from the surface of the moon. The frequency spectrum of the reflected signals is used to locate discrete, heterogeneous, scattering centers on the lunar surface. The scattering centers are probably distinguished from the surrounding terrain by a higher surface reflectivity. Continuous-wave bistatic radar could provide an important new method for the study and mapping of planetary surfaces.  相似文献   

A sporadic third layer in the ionosphere of Mars   总被引：1，自引：0，他引：1  

Pätzold M  Tellmann S  Häusler B  Hinson D  Schaa R  Tyler GL 《Science (New York, N.Y.)》2005,310(5749):837-839

The daytime martian ionosphere has been observed as a two-layer structure with electron densities that peak at altitudes between about 110 and 130 kilometers. The Mars Express Orbiter Radio Science Experiment on the European Mars Express spacecraft observed, in 10 out of 120 electron density profiles, a third ionospheric layer at altitude ranges of 65 to 110 kilometers, where electron densities, on average, peaked at 0.8 x 10(10) per cubic meter. Such a layer has been predicted to be permanent and continuous. Its origin has been attributed to ablation of meteors and charge exchange of magnesium and iron. Our observations imply that this layer is present sporadically and locally.  相似文献   

STUDIES ON THE ETIOLOGY OF EGYPTIAN TRACHOMA     

Olitsky PK  Tyler JR 《Science (New York, N.Y.)》1933,78(2010):18

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