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排序方式: 共有192条查询结果,搜索用时 15 毫秒
21.
In order to investigate the levels of the polycyclic aromatic hydrocarbons, mainly benzo[a]pyrene because of its carcinogenicity, 55 samples of smoke flavour and smoked foods were analysed. The samples tested included 11 samples of liquid smoke flavour and 44 samples of smoked foods like bacon, loin, turkey, sausage, ox rib, etc. from different brands. A liquid chromatographic method was developed using a fluorescence detector. Benzo[a]pyrene was found in 73% of the liquid smoke flavour samples analysed. The levels varied from 0.1 to 336.6 micrograms/kg. Three liquid smoke flavour samples showed levels of benzo[a]pyrene above the maximum level recommended by FAO/WHO (10 micrograms/kg). From the total of 44 smoked food samples analysed, benzo(a)pyrene was detected in 23 samples (52%). The levels varied from 0.1 to 5.9 micrograms/kg. Anthracene and fluoranthene, non-carcinogenic polycyclic aromatic hydrocarbons, were found in almost all the samples analysed. Benzo[ghi]perylene, 3,4-benzofluoranthene and 1,2,3,4-dibenzopyrene were not found in any of the 55 samples analysed. 相似文献
22.
HR Franklin GP Simonetti AC Dubbelman WW ten Bokkel Huinink BG Taal G Wigbout IA Mandjes OB Dalesio NK Aaronson 《Canadian Metallurgical Quarterly》1994,5(2):113-117
Human neutrophil PLD activity stimulated with GTP-gamma-S was reconstituted with recombinant ARF1 in cytosol-depleted cells. PMA-pretreatment of intact cells greatly enhanced the subsequent reconstitution of the ARF1-regulated PLD activity. This enhancement was only observed provided that the intact cells were pretreated with PMA, suggesting the stable recruitment of a cytosolic component, presumably protein kinase C, to the membranes. rARF1-reconstituted PLD activity was not dependent on MgATP, but could be considerably enhanced by MgATP. Maximal effects of MgATP were seen at 1 mM. This enhancement by MgATP could not be attributed to protein kinase C. Neomycin was found to inhibit ARF1-regulated PLD activity suggesting the requirement for polyphosphoinositides. We conclude: (i) that many of the observed effects of PMA may be dependent on the presence of the small GTP-binding protein, ARF, and (ii) polyphosphoinositides are required for ARF1-stimulated PLD activity. 相似文献
23.
C Skak RJ Holm-Knudsen H Schwartz OB Hansen JF Schmidt 《Canadian Metallurgical Quarterly》1994,156(39):5686-5688
The aim of the study was to investigate the time spent on different procedures in an orthopaedic operating theatre, and to evaluate the ability of doctors to predict their own time consumption. Time schedules were registered for 146 operations, of these 104 were either knee or hip replacements. Sixty percent of the total time was spent on surgery. The median misjudgment was 15 minutes for surgeons and five minutes for anaesthetists. An improvement in the doctors' ability to predict their own time consumption in the course of the study period could not be demonstrated. Comparing the study period with the similar period the year before it was not possible to demonstrate a change in the number of cancelled operations or the number of days with overtime. Epidural anaesthesia with bupivacaine was the most time consuming anaesthesia, the differences between the other forms of anaesthesia used were insignificant. 相似文献
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C Gomez-Sanchez OB Holland JR Higgins DC Kem NM Kaplan 《Canadian Metallurgical Quarterly》1976,99(2):567-572
To investigate the control of aldosterone secretion, non-stress levels of serum aldosterone, corticosterone, and prolactin, and renin activity were determined at 4-h intervals during 24-h light-dark cycles in adult male rats on regular and low-sodium diets. Circadian rhythms of plasma aldosterone, prolactin, and corticosterone concentrations and of serum renin activity were demonstrated during a regular sodium diet. When the rats were on a low-sodium diet, a circadian rhythm of serum corticosterone and aldosterone concentration was observed, but there was no circadian variation in serum renin activity or in serum prolactin concentration. Serum aldosterone concentration correlated with serum corticosterone concentration (r = 0.48) and serum renin activity (r = 0.36) during a low-sodium diet. Serum prolactin concentration did not correlate with serum aldosterone concentration or serum osmolality. These data are compatible with a role for renin and ACTH, but not for prolactin, in the modulation of aldosterone secretion in the rat. 相似文献
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Large concentrations of solvents vapour were determined in occupational air. Individual monitor was effective in the assessment of personal exposure of workers to the solvents. 相似文献
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AB Jamjoom NF Khalaf AA Mohammed ZA Jamjoom TY Kashoggi OB Abdelbasit NU Rahman 《Canadian Metallurgical Quarterly》1998,140(11):1121-1125
In this study, the authors attempt to provide an account of the factors that affect the outcome of hydrocephaly in 26 foetuses. The hydrocephalus was related to a myelomeningocele in 35% of patients. Sixty-two percent of foetuses showed intra-uterine progression of their hydrocephalus and 50% were shunted postnatally. At a mean follow up of 2 years, the outcome was considered "fair" in 54% of patients. Our findings demonstrate that in foetal hydrocephaly a more favourable outcome is expected in patients with hydrocephalus which does not progress in utero, in whom the labour is not induced before 36 weeks of gestation, who are delivered vaginally weighing more than 2.5 kg and have a head circumference below the 95th centile and a CT cortical mantle thickness of 2 cm and more and who are treated by CSF shunting. The diagnosis of the foetal hydrocephaly at or before 28 weeks of gestation and the presence of a myelomeningocele did not affect the outcome significantly. Neurosurgeons are reminded to keep an open mind for infants with foetal hydrocephaly and to offer active treatment to patients with a potentially favourable outcome. 相似文献