Genetic Structure of Peruvian Populations of Phytophthora infestans     

Perez WG  Gamboa JS  Falcon YV  Coca M  Raymundo RM  Nelson RJ 《Phytopathology》2001,91(10):956-965

ABSTRACT Isolates of the late blight pathogen Phytophthora infestans (n = 327) from the central to southern Peruvian Andes were systematically collected in 1997 to 1999 and analyzed to determine the pathogen's population structure at its host's center of diversity. No isolates of the A2 mating type were detected. Cluster analysis of DNA fingerprinting data indicated that the collection consisted of five major groups that were interpreted to be clonal lineages. Two of the lineages (US-1 and EC-1) have been previously described, and three (PE-3, 5, and 6) are described here for the first time. Collections from three areas in the central Peruvian Andes, including two key sites used in an international potato breeding program, consisted of isolates of the EC-1 lineage, which has been reported to dominate the pathogen population in Andean countries to the north of Peru. The collections from Cusco and Puno were more diverse. More than one lineage was detected in 10 of the 20 fields sampled in Cusco. Data on virulence, metalaxyl sensitivity, and band data for allozymes, mitochondrial DNA, and ipiB1 suggested that PE-3 may have been produced through recombination events between US-1 and EC-1. Restriction fragment length polymorphism and amplified fragment length polymorphism marker data were not consistent with this hypothesis.  相似文献   

Serum total and ionized magnesium concentrations and urinary fractional excretion of magnesium in cats with diabetes mellitus and diabetic ketoacidosis     

Norris CR  Nelson RW  Christopher MM 《Journal of the American Veterinary Medical Association》1999,215(10):1455-1459

OBJECTIVE: To determine magnesium (Mg) status in cats with naturally acquired diabetes mellitus (DM) and diabetic ketoacidosis (DKA), evaluate changes in Mg status after treatment for DKA, and correlate Mg status with systemic blood pressure and degree of glycemic control. DESIGN: Case series and cohort study. ANIMALS: 12 healthy cats (controls), 21 cats with DM, and 7 cats with DKA. PROCEDURE: Serum total magnesium (tMg) and ionized magnesium (iMg) concentrations and spot urinary fractional excretion of magnesium (FEmg) were determined, using serum and urine samples obtained from all cats when they were entered in the study and from cats with DKA 12, 24, and 48 hours after initiating treatment. Indirect blood pressure and degree of glycemic control were determined in 10 and 21 cats with DM, respectively. RESULTS: Initially, 2 and 13 cats with DM and 1 and 4 cats with DKA had serum tMg and iMg concentrations, respectively, less than the low reference limit (mean-2 SD) determined for controls. In cats with DKA, serum tMg concentration decreased significantly over time after initiating treatment. Urinary FEmg was significantly higher in cats with DM or DKA, compared with controls. Systemic hypertension was not detected nor was there a correlation between Mg status and degree of glycemic control in cats with DM. CONCLUSIONS AND CLINICAL RELEVANCE: Hypomagnesemia was a common finding in cats with DM and DKA and was more readily identified by measuring serum iMg concentration than tMg concentration. The clinical ramifications of hypomagnesemia in such cats remain to be determined.  相似文献   

Epizootic of adenovirus infection in American black bears     

J E Collins  P Leslie  D Johnson  D Nelson  W Peden  R Boswell  H Draayer 《Journal of the American Veterinary Medical Association》1984,185(11):1430-1432

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The draft: graduate schools and students are still worried     

Nelson B 《Science (New York, N.Y.)》1968,162(3854):653-655

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Kansas: police-student violence imperils university     

Nelson B 《Science (New York, N.Y.)》1970,169(3945):567-569

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Metabolism stall for male equine   总被引：1，自引：0，他引：1  

M C Stillions  W E Nelson 《Journal of animal science》1968,27(1):68-72

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The Effect of Prophylactic Treatment of Pregnant Beef Cows on the Incidence of Nutritional Muscular Dystrophy. A Field Trial          下载免费PDF全文

F. C. Nelson  M. Hidiroglou    H. A. Hamilton 《The Canadian veterinary journal. La revue veterinaire canadienne》1964,5(10):268-273

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Albany: new york state university center on the way up     

Nelson B 《Science (New York, N.Y.)》1967,155(3769):1521-1525

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Prevalence of gastric lesions in racing Alaskan sled dogs     

Davis MS  Willard MD  Nelson SL  Mandsager RE  McKiernan BS  Mansell JK  Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314

Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

Henneguya curvata sp. n. (Myxosporea: Myxobolidae) parasitizing the gills of Serrasalmus spilopleura (Characidae: Serrasalminae), a South American freshwater fish     

Barassa B  Adriano EA  Arana S  Cordeiro NS 《Folia parasitologica》2003,50(2):151-153

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