Acute oxalate toxicity of sheep associated with slender iceplant (Mesembryanthemum nodiflorum)     

RH JACOB  RL PEET 《Australian veterinary journal》1989,66(3):91-92

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Soft tissue sarcoma in a short‐beaked echidna (Tachyglossus aculeatus)          下载免费PDF全文

RL Robey  C Sangster  M Gabor  SA Lindsay 《Australian veterinary journal》2018,96(9):360-365

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Infectivity of Marek's disease agent after different treatments used in vaccine production     

Kottaridis SD  Luginbuhl RE  Fredrickson TN 《American journal of veterinary research》1969,30(10):1851-1855

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A serologic survey for canine brucellosis in a metropolitan area   总被引：3，自引：0，他引：3  

L E Fredrickson  C E Barton 《Journal of the American Veterinary Medical Association》1974,165(11):987-989

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Influence of smoke exposure on soil enzyme activities and nitrification     

S. W. Li  J. K. Fredrickson  M. W. Ligotke  P. Van Voris  J. E. Rogers 《Biology and Fertility of Soils》1988,6(4):341-346

Summary Soil was exposed to red phosphorous/butyl rubber (RP/BR) aerosols at various relative humidities in a recirculating environmental wind tunnel. Soil microbial and enzymatic activities were measured immediately after exposure and periodically thereafter for 56 days. The nitrification potential was significantly reduced in soil amended with ammonium sulfate and exposed to RP/BR smoke, and could be related to a decline in soil pH. The rate of nitrate formation in unamended soil with time was also reduced, but by 57 days postexposure, concentrations were similat to those of unexposed controls in all but the thinnest soil lense. Soil dehydrogenase and phosphatase enzyme activities were sensitive to RP/BR smoke and in some treatments no activity was detected. The measured activities did not recover within the 56-day postexposure period and in some cases declined. Soil lense thickness was the greatest factor controlling the degree of RP/BR effects, indicating that injury to soil microbial and enzymatic activities may be surficial. Deposition of smoke particles increased with increasing relative humidity, which had a significant impact on the activities measured.  相似文献   

Human experimentation     

Fredrickson DS 《Science (New York, N.Y.)》1975,188(4193):1062

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Evolution of block copolymer lithography to highly ordered square arrays     

Tang C  Lennon EM  Fredrickson GH  Kramer EJ  Hawker CJ 《Science (New York, N.Y.)》2008,322(5900):429-432

The manufacture of smaller, faster, more efficient microelectronic components is a major scientific and technological challenge, driven in part by a constant need for smaller lithographically defined features and patterns. Traditional self-assembling approaches based on block copolymer lithography spontaneously yield nanometer-sized hexagonal structures, but these features are not consistent with the industry-standard rectilinear coordinate system. We present a modular and hierarchical self-assembly strategy, combining supramolecular assembly of hydrogen-bonding units with controlled phase separation of diblock copolymers, for the generation of nanoscale square patterns. These square arrays will enable simplified addressability and circuit interconnection in integrated circuit manufacturing and nanotechnology.  相似文献   

Accumulation of Mn(II) in Deinococcus radiodurans facilitates gamma-radiation resistance     

Daly MJ  Gaidamakova EK  Matrosova VY  Vasilenko A  Zhai M  Venkateswaran A  Hess M  Omelchenko MV  Kostandarithes HM  Makarova KS  Wackett LP  Fredrickson JK  Ghosal D 《Science (New York, N.Y.)》2004,306(5698):1025-1028

Deinococcus radiodurans is extremely resistant to ionizing radiation. How this bacterium can grow under chronic gamma radiation [50 grays (Gy) per hour] or recover from acute doses greater than 10 kGy is unknown. We show that D. radiodurans accumulates very high intracellular manganese and low iron levels compared with radiation-sensitive bacteria and that resistance exhibits a concentration-dependent response to manganous chloride [Mn(II)]. Among the most radiation-resistant bacterial groups reported, Deinococcus, Enterococcus, Lactobacillus, and cyanobacteria accumulate Mn(II). In contrast, Shewanella oneidensis and Pseudomonas putida have high iron but low intracellular manganese concentrations and are very sensitive. We propose that Mn(II) accumulation facilitates recovery from radiation injury.  相似文献   

Development of a novel diagnostic test for detection of bovine viral diarrhea persistently infected animals using hair   总被引：1，自引：0，他引：1  

Kuldeep Singh  Myrna M. Miller  Laura J. Kohrt  Gail Scherba  Edgar F. Garrett  Richard L. Fredrickson 《Journal of veterinary science (Suw?n-si, Korea)》2011,12(3):295-297

The purpose of this study was to determine whether manually plucked hairs might serve as an alternative sample for a quantitative real time polymerase chain reaction (qRT-PCR) testing. Twenty three, 1~3 week old, non-bovine viral diarrhea virus (BVDV) vaccinated calves, found to be positive for BVDV by immunohistochemical staining, were selected and hairs were manually plucked from the ear. qRT-PCR was performed on samples consisting of more than 30 hairs (30~100) and whole blood. All 23 animals were positive for the virus by qRT-PCR performed on the whole blood and when samples of more than 30 hairs were assayed. Additionally, qRT-PCR was performed on groups of 10 and 20 hairs harvested from 7 out of 23 immunohistochemical staining-positive calves. When groups of 20 and 10 hairs were tested, 6 and 4 animals, respectively, were positive for the virus.  相似文献   

Hematopoietic destruction in Marek's disease   总被引：4，自引：0，他引：4  

R M Jakowski  T N Fredrickson  T W Chomiak  R E Luginbuhl 《Avian diseases》1970,14(2):374-385

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