Chromosome and plasmid-encoded N-acyl homoserine lactones produced by Agrobacterium vitis wildtype and mutants that differ in their interactions with grape and tobacco     

Yaxin Li  Matthew R. Gronquist  Guixia Hao  Michele R. Holden  Anatol Eberhard  Russell A. Scott  Michael A. Savka  Erno Szegedi  Sandor Sule  Thomas J. Burr   《Physiological and Molecular Plant Pathology》2005,67(6):101

Agrobacterium vitis causes crown gall disease on grapevines. It also induces a specific necrosis on grape roots and a hypersensitive response (HR) on tobacco that are regulated by a complex quorum-sensing regulatory system. Strain F2/5 produces at least six N-acyl-homoserine lactones (AHLs) that function as signal molecules in quorum-sensing. The AHLs differ in acyl side chain length (8–16 carbons) as determined by gas chromatography/mass spectrometry and electrospray ionization tandem mass spectrometry. Mutant derivatives of F2/5 differ in ability to cause necrosis and the HR and show variable AHL profiles as determined by a thin-layer chromatography/biosensor assay. All wildtype A. vitis strains revealed the presence of long-chain AHLs regardless of tumorigenicity or ability to cause the HR. Whereas genes encoding long-chain AHLs are predicted to reside on the F2/5 chromosome, the determinants for short-chain AHLs were shown to be located on conjugal plasmids.  相似文献   

A Novel Approach to Brachycephalic Syndrome. 1. Evaluation of Anatomical Intranasal Airway Obstruction          下载免费PDF全文

Gerhard U. Oechtering  Sabine Pohl  Claudia Schlueter  Johanna P. Lippert  Michaele Alef  Ingmar Kiefer  Eberhard Ludewig  Riccarda Schuenemann 《Veterinary surgery : VS》2016,45(2):165-172

  相似文献   

Computed tomography of the lungs of Indian pythons (Python molurus)     

Pees MC  Kiefer I  Ludewig EW  Schumacher JP  Krautwald-Junghanns ME  Oechtering GU 《American journal of veterinary research》2007,68(4):428-434

OBJECTIVE: To evaluate the use of computed tomography (CT) for detection of pneumonia in snakes. ANIMALS: 8 clinically normal Indian pythons (Python molurus) and 5 pythons with evidence of respiratory tract disease. PROCEDURES: Preliminary examinations (clinical examination, conventional radiography, and microbiologic examination of a transtracheal wash sample) were performed. The lungs of each snake were then examined by use of CT performed in accordance with a standardized protocol. Structures of the lungs were assessed, and thickness and attenuation of the parenchyma were determined. RESULTS: It was possible to assess lung parenchyma in all pythons. Mean +/- SD attenuation in healthy pythons was -744.4 +/- 47.1 Hounsfield units. Significant differences were not evident between the right and left lungs or among measurement areas within a lung. In all Indian pythons with clinical signs of dyspnea and microbiologic detection of pathogens, hyperattenuation of the alveolar tissue was evident. CONCLUSIONS AND CLINICAL RELEVANCE: Analysis of the results revealed the benefit of CT for use in the diagnosis of pneumonia in snakes. A standardized protocol and reference values were established as a basis for CT assessment of the lungs of snakes.  相似文献   

Ocular Onchocerca infections in two dogs in western United States     

Eberhard ML  Ortega Y  Dial S  Schiller CA  Sears AW  Greiner E 《Veterinary parasitology》2000,90(4):333-338

Two dogs, one from California and one from Arizona, were found to have aberrant infections caused by filarial nematodes of the genus Onchocerca. In both cases, the parasites are localized in or near the eye. In one case the worm was located in the cornea and was surgically removed. In the second case, a very marked granulomatous reaction was induced in the retrobulbar space, mimicking an abscess. This eye was enucleated. The worms in both instances were female, and were gravid, i.e. contained microfilariae in utero, indicating that a male worm(s) had been present and mating had occurred. The exact identity of the species of Onchocerca responsible cannot be determined, although the features observed are most like Onchocerca lienalis of cattle. These cases represent the fourth and fifth such cases reported from the US, and are especially interesting because of the unusual location of the worms, the small number of recognized cases, and the similarity to a recent zoonotic human infection.  相似文献   

Die Grundlagen der forstlichen Betriebssysteme     

Dr. J. Eberhard 《European Journal of Forest Research》1926,48(1):18-31

Ohne Zusammenfassung  相似文献   

Zeitstudien in der Holzhauerei ausgeführt von der badischen Staatsforstverwaltung in den Jahren 1931 und 1932     

Forstassessor Dr. Eberhard Barth 《European Journal of Forest Research》1932,54(23):789-812

  相似文献   

Waldbaukursus im Forstbezirk Langenbrand     

Eberhard 《Forstwissenschaftliches Centralblatt》1913,35(5):288

Ohne Zusammenfassung  相似文献   

Waldbaukursus im Forstbezirk Langenbrand     

Oberförster Dr. Eberhard 《European Journal of Forest Research》1913,35(5):288-288

  相似文献   

Begriffliches: Dauerwald — Blendersaumschlag     

Dr. J. Eberhard 《European Journal of Forest Research》1921,43(12):441-448

  相似文献   

Verbesserungsvorschlag zur gefahrlosen Beheizung brennbarer Lösungsmittel zur Fettextraktion (Kurzmitteilung)     

Eberhard Thalmann 《Archives of Agronomy and Soil Science》2013,59(6):507-508

A crop rotation field study with manure application was established at Tartu in 1985. Biological and chemical properties were evaluated on fine sandy loam Podzoluvisol in May 1989. The treatments included unmanured (N_o and N₈₀) controls, two peat based composts and five manures of different origin. The procedures of the most probable number (MPN) and spread plate counts were used for microbiological investigation, but also enzymatic activities, nitrogen forms, total‐C and pH were simultaneously estimated in plough layer soil. The most variable i.e. the most clearly differentiated physiological groups within manures were cellulolytic and ammonifying bacteria followed by Azotobacter spp. together with actinomycetes. Abundance of aerobic cellulolytic and ammonifying bacteria correlated positively with the number of soil algae and fungi, and negatively with nitrate‐ and nitrite‐reductase. The number of actinomycetes correlated positively with urease and catalase activity. Soil enzymatic activity was mainly modified by nitrite‐reductase. Peat composts had the highest C‐content and highest pH value compared with other soils. Pig slurry and NH₄NO₃ (N80) treatment had the highest level of fixed NH⁺ ₄ ‐ions in soil. Nine months after manure application no differences were found in the unstable NO^– ₃content of soil. Variation in the number of the studied microbial physiological groups between treatments remained insignificant.  相似文献