Cost of electricity     

Bartlett AA 《Science (New York, N.Y.)》1989,243(4894):992

  相似文献   

Climatic Limits on Landscape Development in the Northwestern Himalaya   总被引：1，自引：0，他引：1  

N Brozović  DW Burbank  AJ Meigs 《Science (New York, N.Y.)》1997,276(5312):571-574

The interaction between tectonism and erosion produces rugged landscapes in actively deforming regions. In the northwestern Himalaya, the form of the landscape was found to be largely independent of exhumation rates, but regional trends in mean and modal elevations, hypsometry (frequency distribution of altitude), and slope distributions were correlated with the extent of glaciation. These observations imply that in mountain belts that intersect the snowline, glacial and periglacial processes place an upper limit on altitude, relief, and the development of topography irrespective of the rate of tectonic processes operating.  相似文献   

Junior astronomy club     

Bartlett GH 《Science (New York, N.Y.)》1966,151(3710):518

  相似文献   

Xenon Hydroxide: An Experimental Hazard     

Bartlett N  Rao PR 《Science (New York, N.Y.)》1963,139(3554):506

  相似文献   

AN UNUSUAL ATMOSPHERIC PHENOMENON     

Bartlett BW 《Science (New York, N.Y.)》1928,67(1729):195

  相似文献   

The Case for a Hubble Constant of 30 km s-1 Mpc-1     

Bartlett JG  Blanchard A  Silk J  Turner MS 《Science (New York, N.Y.)》1995,267(5200):980-983

Although recent determinations of the distance to the Virgo cluster based on Cepheid variable stars represent an important step in pinning down the Hubble constant, after 65 years a definitive determination of the Hubble constant still eludes cosmologists. At present, most of the observational determinations place the Hubble constant between 40 and 90 kilometers per second per megaparsec (km s(-1) Mpc(-1)). The case is made here for a Hubble constant that is even smaller than the lower bound of the accepted range on the basis of the great advantages, all theoretical in nature, of a Hubble constant of around 30 kilometers per second per megaparsec. Such a value for the Hubble cures all of the ills of the current theoretical orthodoxy, that is, a spatially flat universe composed predominantly of cold dark matter.  相似文献   

Bacterial contamination of commercial ear cleaners following routine home use     

Bartlett SJ  Rosenkrantz WS  Sanchez S 《Veterinary dermatology》2011,22(6):546-553

Ear cleaning solutions are designed for repeated use, which raises the possibility for bacterial contamination leading to recurrent or persistent infectious otitis. The purpose of this study was to investigate the prevalence of bacterial contamination of commercial ear cleaners following routine home use in dogs and to describe the characteristics that are associated with contamination. Used ear cleaner bottles and information regarding their use were obtained from canine owners visiting veterinary dermatologists. Both the bottle applicator tips and the solution contents were cultured for aerobic bacteria. Bacterial contamination was present on 10% of the bottle tips and in 2% of the solutions. Isolated bacteria included Staphylococcus pseudintermedius, Bacillus spp., coagulase-negative Staphylococcus spp., Micrococcus spp. and Burkholderia cepacia. The contamination rate was significantly higher on the applicator tips than in the solutions (P = 0.0076). The applicator tip contamination rate was significantly higher in expired samples (17%) than in-date samples (4%; P = 0.0277). The bottle sizes were significantly larger for the samples with contaminated applicator tips compared with noncontaminated tips (P = 0.0455). The contamination rate was significantly higher when Tris-EDTA was an ingredient. Cleanliness of the bottle, contact with the ear canal and infection status of the ear at time of culture had no bearing on the contamination rate. In summary, with routine home use of commercial ear cleaners, pathogenic bacterial contamination is of minor concern. This concern may increase when expired products or larger bottles of ear cleaner are used and when Tris-EDTA is an ingredient.  相似文献   

Carriage of Clostridium difficile and Other Enteric Pathogens Among a 4‐H Avocational Cohort     

S. E. McNamara  N. Abdujamilova  P. Somsel  M. J. Gordoncillo  J. M. DeDecker  P. C. Bartlett 《Zoonoses and public health》2011,58(3):192-199

Clostridium difficile (CD), Salmonella, Campylobacter and enterohemorrhagic Escherichia coli (EHEC) are major causes of morbidity in a variety of enteric diseases in humans and animals, but subclinical carriage in both is probably more common than are clinical cases. Little is known regarding the prevalence of these pathogens in animals raised for exhibit at Michigan county fairs or the frequency with which Michigan citizens raising these animals may have been subclinically colonized. To address these issues, 361 fecal specimens from 158 humans and 203 of their farm animals were cultured for CD, Salmonella and Campylobacter. Additionally, 50 people and their cattle were tested for EHEC. No EHEC, Salmonella or Campylobacter were detected. However, 16 specimens (4.4%) were positive for CD: 13 humans, two horses and one pig. None of the farm animal specimens submitted by any of the 13 CD‐positive humans were positive for CD. Strain characterization [toxinotype, pulsed‐field gel electrophoresis (PFGE)] demonstrated that the human CD isolates were similar to what has been reported previously in the general US population. We conclude that horses and farm animals (cattle, sheep, goats and swine) at 1–2 months before market weight showed no evidence of wide‐spread carriage of the common enteric pathogens, including the recently reported CD toxinotype V. These results provide no support to the hypothesis that 4‐H members or others visiting county fair animal husbandry projects in these counties may be at increased risk for acquisition of CD, Salmonella, Campylobacter or EHEC from animals.  相似文献   

Nitrification in soil suspensions treated with chromium (III,VI) salts or tannery wastes     

Bruce R. James  Richmond J. Bartlett 《Soil biology & biochemistry》1984,16(3):293-295

  相似文献   

Pathology of experimentally-induced, acute toxoplasmosis in macropods   总被引：1，自引：0，他引：1  

GL REDDACLIFF  WJ HARTLEY  JP DUBEY  DW COOPER 《Australian veterinary journal》1993,70(1):4-6

SUMMARY Thirteen Tammar wallabies (Macropus eugenii) were dosed orally with 500, 1000 or 10 000 oocysts of Toxoplasma gondii, as part of a vaccination trial. Eleven animals died of acute toxoplasmosis 9 to 15 days after challenge. The lesions were similar in all animals, consisting of foci of necrosis and inflammation in the intestines, lymphoid tissue, adrenal cortex, heart, skeletal muscle and brain, and severe generalised pulmonary congestion and oedema. Free and intracellular tachyzoites of Toxoplasma were associated with the lesions. The remaining 2 animals had shown no signs of disease when euthanased four months after challenge. Small, focal, non-suppurative inflammatory lesions were seen in brain, heart and skeletal muscle of these animals and chronic Toxoplasma infection was confirmed by mouse inoculation.  相似文献