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731.
Abstract: This paper addresses a number of questions regarding the role of Teleglobe Canada in a rapidly changing regulatory environment. The historical reasons for Teleglobe's exclusion from CHTC regulation are looked at, together with the likelihood of its continued special status vis-à-vis the other carriers. Taking into consideration recent trends in international telecommunications policy, the impact of Teleglobe's denationalization on the domestic industry is also considered. Finally, recommendations are made aimed at resolving some of the issues associated with privatization. A greater role is envisaged for both the federal Communications minister and the CHTC with respect to Teleglobe. Special emphasis is placed on the need to establish a comprehensive national telecommunications policy involving greater precision with regard to overriding priorities and considerable flexibility, especially in view of the highly innovative character of the sector.  相似文献   
732.
733.
Nuclear spin tomography since its beginnings in the seventies has steadily gained in importance as a method of examination in medical diagnostics as it produces a picture. In the field of forensic medicine the NMR technique as used for anatomic-anthropologic issues attempting to identify skulls this is a valuable supplement to an extension of the existing methods of investigation. The results of a measurement of the thickness of soft facial tissue in a live test person is shown as compared to measures obtained by sonography.  相似文献   
734.
Demographic and trend analysis of 881 consecutive suicides in blacks and whites is presented. For the years 1975 through 1984, the suicide rate was 15.1/100 000 and did not significantly change. White males were overrepresented in all age groups, had an overall suicide rate of 34.9, and showed a small but statistically significant increase in rate which was not accounted for by any specific age group. White females, in general, were represented in proportion to their prevalence in the population, and those ages 20 to 24 demonstrated an increasing suicide rate which was small. Black males were at highest risk in their twenties, showed no significant trends, and were also represented near their prevalence in the population. Black females of all ages were underrepresented, and had low suicide rates which decreased with time. No significant rate changes were noted for teenagers or the elderly. Firearms was the method of choice in all groups, although methods varied with age, race, and sex, and male children preferred hanging. Small but significant increases were noted for the prevalence of nondrug methods in females and carbon monoxide deaths in white males. Similarities and differences to larger scale studies are discussed. Suicide may have characteristics unique to given geographical areas and pervasive to all areas. The authors advocate study and publication of local data to clarify further the nature of suicide.  相似文献   
735.
The effects of carbon monoxide and cyanide on the hepatic redox state and energy charge were investigated. Rats were used for the experiment under pentobarbital anesthesia. Immediately after laparotomy, a rat was placed in an animal chamber made of a transparent plastic box and exposed to a test gas for 3 min. Every test gas was produced in a gas chamber connected to the animal chamber with a flexible tube. HCN was produced from NaCN and H2SO4. In the CO inhalation experiment, various amounts of CO were introduced into the gas chamber. Immediately after an exposure, about 2 g liver was frozen in situ with a precooled clamp. Oozed blood from the wound surface was sampled. Concentrations of ATP, ADP, AMP, acetoacetate, and beta-hydroxybutyrate in hepatic mitochondria were determined, and the redox state and the energy charge were calculated. For cyanide as well as CO, significant negative correlations were found between the concentration in the blood and the redox state. The same held true for the energy charge. The redox state showed a slight increase at low concentrations of both gases; however, thereafter it began to decrease sharply with increases in concentrations. When concentrations of the toxicant in the blood reached certain levels, a kind of turning point, beyond which the redox state does not decrease any more, was observed. It was about 40% for HbCO and about 2.0 micrograms/ml for cyanide, and the points seemed to be related to the concentrations, beyond which cells are irreversibly damaged. On the other hand, the energy charge did not change at low concentrations. With an increase in toxicant concentrations, the energy charge decreased drastically. The rate of decrease in the energy charge became higher when blood concentrations exceeded certain levels. It was about 40% for HbCO and 2.0 micrograms/ml for cyanide. The presence of low levels of blood cyanide did not affect the relationship between the energy charge and the HbCO concentration.  相似文献   
736.
737.
The armamentarium of the forensic thanatologist includes the examiner's subjective assessment of bodily changes together with comprehensive evaluation of environmental and associated factors to estimate the postmortem interval (PMI). Of the various objective means, postmortem accumulation of potassium in vitreous humor is a widely used gauge. In view of the considerable variability inherent in these techniques, an additional marker with greater accuracy would be a welcome supplement to these indices. We have developed a method of estimating PMI from the level of 3-methoxytyramine (3-MT) in the dorsal putamen of the brain. The supernatant of a sample of putamen, sonicated in 6 volumes (weight/volume) of 0.1 M perchloric acid and centrifuged at 51 000 times gravity for 10 min, was analyzed for 3-MT using high-pressure liquid chromatography with electrochemical detection. The change of 3-MT in the putamen is linearly related to the PMI (range: 5.5 to 60 h), irrespective of patient age (1 to 84 years). This observation is attributable to several factors, including high substrate (dopamine) concentration, preservation of catechol-O-methyl transferase activity, and an inactivation of monoamine oxidase activity, as a result of a decrease in tissue pO2.  相似文献   
738.
739.
Police leadership is increasingly dependent on community oriented policing (COPS) federal grants because of diminishing financial resources. This paper demonstrates the importance of excellent police grantsmanship skills while simultaneously providing theoretical and concrete steps for achieving a successful grant package. Furthermore, a case study example is presented where COPS grants and federal funding assisted in the acquisition of community-oriented and problem-solving strategic objectives.  相似文献   
740.
Although the “stop snitching” phenomenon has brought recent attention to crime reporting, researchers have recognized for a long time the importance of this issue. Early studies focused on individual-level factors related to reporting, but recently, researchers have begun to examine neighborhood-level predictors. Most of these studies, however, omit key individual-level predictors of reporting and provide relatively little insight into the individual-level processes through which neighborhood context might affect reporting. This study uses survey data from a multisite, school-based study to examine whether neighborhood structural characteristics and individual-level attitudes and experiences are related to youths’ intentions to report crime. In addition, we assess whether neighborhood characteristics influence reporting via their effect on individual-level attitudes and experiences. We find that neighborhood poverty has an inverse relationship with crime reporting intentions and that numerous individual-level measures are associated with reporting, including attitudes toward the police, delinquency, and perceptions of the community. Importantly, the effects of neighborhood characteristics are reduced when youths’ attitudes and experiences are included in the model. Taken together, our findings suggest that neighborhood context might affect reporting by shaping the attitudes and experiences of youth.  相似文献   
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