Intravenous and Retrograde Urography

Cumming, Robert E.

doi:10.1001/jama.1936.02770080016006

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…another has been considered previously. [15] When normalized for geometry, these forces are about two orders of magnitude less than those measured in this work for a given experiment, so cannot significantly affect the overall force balance. Therefore, an estimation of the fracture strength of the nanotube (133 ± 73 GPa, calculated as by Yu et al [1] ) can be made.…”

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confidence: 63%

Fracture Transitions at a Carbon‐Nanotube/Polymer Interface

et al. 2005

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This mixture was centrifuged at 12 000 rpm and at 4°C for 1 h. For Dox infusions, 500 lL of 3.68 × 10 -5 M Dox solution and 50 lL of original microgel sample were incorporated in 5 mL of PBS (pH 7.4) before centrifugation. The Dox loading level of the microgels used in this study was 31.5 % (mg Dox/mg polymer). Bioconjugation of Transferrin to the Surface of Microgels:The conjugation of transferrin and albumin to the microgels was accomplished by using the same process. A 10 mg ml -1 stock solution of the proteins was made. 240 lL of this solution was then mixed with 300 lL of loaded gels in 0.01 M PBS at pH 7.4. Then, at least a 10-fold molar excess of 1-ethyl-3-(2-dimethylaminopropyl) carbodiimide hydrochloride was added to mediate the formation of an amide bond between carboxylic groups on the gel and amino groups on the protein.R6G-Loaded Microgel Assay: HeLa cells were grown on cover slips in 100 mm tissue culture dishes until 50 % confluency was reached. R6G-loaded hydrogel particles, conjugated to transferrin, were dispersed in high glucose Dulbecco's modified eagle medium (DMEM) supplemented with 10 % fetal bovine serum, 1 % penicillin, and 1 % amphotericin B. For the controls, non-conjugated R6G-loaded microgel particles, particles conjugated to bovine serum albumin, and particles in solution with, but not conjugated to transferrin, were used. Cells were incubated overnight in this system. After washing the coverslips with 10 mM PBS, the cells were fixed with 3-4 % paraformaldehyde, followed by three washes with PBS. The cells were examined under 20× magnification through differential interference contrast and epifluorescence. Quantitative analysis was based on the measurement of luminescence intensity per cell using ImagePro software. Dox-Loaded Microgels Assay:One million HeLa cells were placed in each 60 mm tissue-culture dish and allowed to grow for two days. Dox-loaded hydrogel particles, conjugated to transferrin, were dispersed in high glucose DMEM, supplemented with 10 % fetal bovine serum, 1 % penicillin, and 1 % amphotericin B. HeLa cells were incubated for 36 h with Dox-loaded hydrogel particles conjugated to transferrin and control systems. The cells were then trypsinized, washed with PBS, and stained with Trypan Blue. [1][2][3] and stiffness [4][5][6] of carbon nanotubes are in excess of other fibrous materials and make them attractive as a structural material in future polymer composites. Critically, this reinforcement is effective only when the interfacial adhesion between the nanotube and surrounding polymer is substantial. We report in this work how the interfacial strength between a single carbon nanotube and a polymer matrix increases dramatically when the nanotube surface is chemically modified. This is shown by measuring the force required to pull individual nanotubes out of a polymer matrix using various embedded lengths. As opposed to our previous work, [7][8][9] the nanomechanical test is performed here in an electron microscope, which reveals a transition from nanotube pullout t...

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confidence: 63%

Fracture Transitions at a Carbon‐Nanotube/Polymer Interface

et al. 2005

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“…Since the pioneering work of Cumings and Zetttl [1] carbon nanotube (CNT) based oscillators have became object of many studies. Cumings and Zettl demonstrated the controlled and reversible telescopic extension of multiwalled CNTs, thus realizing ultra low-friction nanoscale linear bearings.…”

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confidence: 99%

Neon atoms oscillating inside carbon and boron nitride nanotubes: a fully atomistic molecular dynamics investigation

Garcez

Moreira

Azevedo

et al. 2010

Molecular Simulation

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In the present work we discuss based on extensive fully atomistic molecular dynamics simulations the dynamics of Neon atoms oscillating inside (5,5)singlewalled carbon nanotubes (CNTs) and boron-nitride (BNNT) ones. Our results show that sustained high frequency oscillatory regimes are possible for a large range of temperatures. Our results also show that the general features of the oscillations are quite similar to CNT and BNNT, in contrast with some speculations in previous work literature about the importance of broken symmetry and chirality exhibited by BNNTs.PACS numbers: 68.65. k, 61.46.+w, 68.37.Lp, 71.15. m arXiv:0707.3392v1 [cond-mat.mtrl-sci]

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“…To be avoided by all ragweed sufferers August to October Rating deduced from air data taken at3 Alaskü stations (Durham, O. C: Atmospheric Allergen* in Alaska, J.…”

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Our National Parks as Ragweed Hay Fever Refuges

Durham¹

1948

JAMA

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The accompanying tabular data on the ragweed pollen hazards in the national parks were secured over a period of thirteen years, during which I made field studies and carried out routine atmospheric pollen tests for one or more seasons in each of the parks and areas herein listed, except as noted. Most of the atmospheric tests have been made by the standard technic recommended by the Aero-Allergen Council of the American Academy of Allergy.1 The figures for "days of high incidence" refer to the average number of days per season when the ragweed pollen concentration reached or exceeded 25 pollen granules per cubic yard of air. "Maximum atmospheric concentration" refers to the highest number of ragweed pollen granules per cubic yard of air during any one twenty-four hour period. A "seasonal total" is the cumulative figure obtained by adding the number of ragweed pollen granules per cubic yard for each day throughout the season. The "index" figure is an arbitrary rating based on the three factors : average length of season, maximum concentration and average seasonal total.2 Areas with an index rating of 10 or more cannot be recommended as suitable for those seeking relief from ragweed hay fever. Preference should be given to parks with indexes less than 5. These may be rated from "fair" to "good." Those areas with indexes less than 1 are excellent ragweed refuges unless heavily infested with sagebrush.

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Intravenous and Retrograde Urography

Cited by 9 publications

References 4 publications

Fracture Transitions at a Carbon‐Nanotube/Polymer Interface

Fracture Transitions at a Carbon‐Nanotube/Polymer Interface

Neon atoms oscillating inside carbon and boron nitride nanotubes: a fully atomistic molecular dynamics investigation

Our National Parks as Ragweed Hay Fever Refuges

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