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Stranica 1 iz 201 rezultatima
Cavity-dumped femtosecond Kerr-lens mode locking in a chromium-doped forsterite laser.
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We report the operation of a cavity-dumped self-mode-locked chromium-doped forsterite laser with pulse energies exceeding 30 nJ and pulse durations as short as 54 fs (FWHM) at 1260 nm. By frequency doubling in a beta-barium borate crystal, pulse energies as high as 3 nJ and pulse durations as short
Release of cobalt from cobalt chromium alloy constructions in the oral cavity of man.
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The release of cobalt from a cobalt chromium alloy construction with a major palatal connector (palatal strap) in the maxilla was determined for 10 test subjects. The concentration of cobalt in unstimulated whole saliva and tongue scrapings was estimated 21, 14 and 7 d respectively before and 1, 2,
Association of chromium exposure with multiple primary cancers in the nasal cavity.
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A 56-year-old man who had worked at a chromate factory for 13 years developed squamous cell carcinoma of the left nasal cavity 11 years after retirement. He received intra-arterial chemotherapy, followed by surgery. Two years later, an adenocarcinoma was identified in the same nasal cavity just
The Absorption and Survival of Red Blood Cells Labelled with Chromium-51 from the Peritoneal Cavity in Man.
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This is a study of the rate of absorption and period of survival of tagged red blood cells introduced into the peritoneal cavity. The investigation was carried out on to healthy adult males, and the red cells were introduced in the course of operations for inguinal hernia.
Effect of adhesive system application for cavities prepared with erbium, chromium: yttrium scandium gallium garnet laser on rat dental pulp tissue.
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We examined the effects of adhesive systems under study applied for a laser-cut cavity using an Er,Cr:YSGG laser on rat dental pulp at 24 h and 14 days postoperatively. Group 1, laser-cut cavities were treated with a self-etching-primer and bonding agent; group 2, pretreated with a phosphoric-acid,
Studies of the resorption of chromium-51 tagged erythrocytes from the peritoneal cavity; the absorption of fluids and particulate matter from the peritoneal cavity.
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The absorption and survival of red blood cells labelled with chromium-51 from the peritoneal cavity in man.
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Disappearance of radioactive chromium tagged erythrocytes from tissues and body cavities of rabbits.
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Absorption of transfused chromium-labeled erythrocytes from the fetal peritoneal cavity in hydrops fetalis.
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[Elimination of pits and fissures in permanent teeth and topical applications of 5 solutions of acetic acid and chromium anhydride for the prevention of dental caries].
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Simultaneous δ 2 H and δ 18 O analyses of water inclusions in halite with off-axis integrated cavity output spectroscopy
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Stable isotope compositions of ancient halite fluid inclusions have been recognized to be valuable tools for reconstructing past environments. Nevertheless, in order to better understand the genesis of halite deposits, it could be of great interest to combine both δ2 H and δ18
In vitro and in vivo corrosion evaluation of nickel-chromium- and copper-aluminum-based alloys.
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BACKGROUND
The low resistance to corrosion is the major problem related to the use of copper-aluminum alloys.
OBJECTIVE
This in vitro and in vivo study evaluated the corrosion of 2 copper-aluminum alloys (Cu-Al and Cu-Al-Zn) compared with a nickel-chromium alloy.
METHODS
For the in vitro test,
Dental caries and trace element composition of whole human enamel: Western United States.
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Samples of whole enamel prepared from 83 teeth were analyzed for the concentrations of 30 trace elements. Samples were from lifelong residents, younger than 20 years of age, of a high-caries area (Oregon) and a low-caries area (California). All samples were caries-free, prepared by standardized
Hexavalent chromium is carcinogenic to F344/N rats and B6C3F1 mice after chronic oral exposure.
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BACKGROUND
Hexavalent chromium [Cr(VI)] is a human carcinogen after inhalation exposure. Humans also ingest Cr(VI) from contaminated drinking water and soil; however, limited data exist on the oral toxicity and carcinogenicity of Cr(VI).
OBJECTIVE
We characterized the chronic oral toxicity and
A revised model of ex-vivo reduction of hexavalent chromium in human and rodent gastric juices.
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Chronic oral exposure to hexavalent chromium (Cr-VI) in drinking water has been shown to induce tumors in the mouse gastrointestinal (GI) tract and rat oral cavity. The same is not true for trivalent chromium (Cr-III). Thus reduction of Cr-VI to Cr-III in gastric juices is considered a protective
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