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A study of bacteriology. arch otolaryngol head neck surg . may 1991; 117 5 ; : 538-41. . myer cm 3rd, cotton rt. historical development of surgery for pediatric laryngeal stenosis. ear nose throat j . aug 1995; 74 8 ; : 560-2, 564. . myer cm 3rd, o''connor dm, cotton rt. proposed grading system for subglottic stenosis based on endotracheal tube sizes. ann otol rhinol laryngol . apr 1994; 103 4 pt 1 ; 319-23. . ochi jw, seid ab, pransky sm. an approach to the failed cricoid split operation. int j pediatr otorhinolaryngol . dec 1987; 14 2-3 ; : 229-34. . perepelitsyn i, shapshay sm. endoscopic treatment of laryngeal and tracheal stenosis-has mitomycin c improved the outcome. Refinements. In addition, each touch of the screen was logged, and the approximately eight weeks of data gathered still needs to be analysed. Currently, the database is only capable of examining information at 20-year intervals known as a static or time-slice approach ; . Initial plans have been developed to add a fourth dimension to the database software C y date-stamping the entities ; so that changes b can be visualised dynamically across time known as a temporal or dynamic approach ; . Development of the tools to do this is well underway. This is a data set covering the built environment in one particular city in North America during one period the 18th century ; . We can expect the eventual creation of many other such data sets covering this and other cities at various points in time. Indeed, the MRG is seeking funding to expand the information in the database to include both earlier and later time periods. ; It is likely that, at least in the immediate future, most of these data sets like MRG ; will use Arc Info software as the underlying base for 2 dimensional mapping, making both the learning skills transferable from one set to another, and making it easier to tie independent sets to one another. Imagine urban historians being able to examine the growth of different cities over the same period of time from their own desktops. The possibilities for comparative studies are only limited by the number of data sets and the lack of standardisation between them. As standards develop, inroads need to be made with governmental agencies, allowing contemporary sets of information to be linked in such a way as to provide similar access to built environment information of the recent past, and to assure future scholars access to information from today without combing through disparate records. We need to be working with records managers from city planning agencies as well as census bureaus and even newsgathering agencies, to assure that future generations will have access to the tools to analyse our contemporary society.

The replication of vaccinia virus is thought to take place exclusively in the cytoplasm of host cells. However, using DNA-DNA hybridization techniques, it can be shown that a significant fraction of the synthesis of vaccinia DNA takes place in the nucleus as well as the cytoplasm. The [3H ]thymidine pulse-labeled vaccinia DNA synthesized in the nucleus reaches a maximum at about 3 h after infection, corresponding to the time of maximal DNA synthesis in infected cells. At this time host DNA synthesis drops to about 25% of the rate of the uninfected cells. Even with short labeling times 2 min ; the nucleus is found to contain 60% of the incorporated [3H]thymidine, much of which is in vaccinia DNA. Prior inhibition of host nuclear DNA synthesis with mitomycin C, followed by removal of the antibiotic, causes a subsequent inhibition of vaccinia DNA synthesis and complete suppression of mature virus. Purified nuclei, isolated from vacciniainfected cells, also synthesize vaccinia DNA in vitro. Over 90% of the DNA synthesized in vitro by isolated nuclei contain vaccinia-specific sequences. The examination of vaccinia-infected cells by autoradiography 4 ; and fluorescent antibody staining 20 ; indicated that vaccinia DNA replicates and virions undergo maturation in large cytoplasmic aggregates factories ; . Subsequently, Joklik and Becker 16 ; demonstrated that the replicating viral DNA, as well as the parental viral DNA, is associated with large cytoplasmic structures which are presumably the same as the vaccinia virosomes identified by autoradiography and electron microscope studies. It is from these factories, starting at 3 to postinfection, that progressively increasing amounts of viral DNA are released and become combined with the viral core and coat proteins. Dahl and Kates 6, 7 ; extended these studies by determining the sedimentation and the density characteristics of parental and newly replicated vaccinia DNA. They showed that the isolated cytoplasmic viral DNA-protein complexes synthesize mRNA sequences with an endogenous RNA polymerase. The mRNA synthesized in vitro is either "early" or "early and late" in accordance with the time of virosome isolation, i.e., before or after vaccinia DNA synthesis has commenced. Moreover, Prescott et al. 30 ; were able to demonstrate that enucleated cells and cell fragments, made from L-cells using cytochalasin B, support vaccinia uncoating and the.

The development of drug resistance was found to be associated to the higher expression of P-Gp, similar to the MDR human SCLC cells 18 ; and the CHRC5 MDR subline 6 ; . Most of the strategies used to treat multidrug resistance associated to P-Gp involve the efflux inhibition provoked by this membrane pump 5, 16 ; . VRP partially reversed resistance to vinblastine, vincristine and mitomycin C exhibited by HCA-2 1cch cells, obtaining a remarkably higher reversal for the selection drug. This could be due to the fact that colchicine has less affinity for P-Gp than the rest of the drugs which is why it might be recognised and transported out of cells less effectively 19 ; . In other studies, verapamil favours the effect of cytotoxic drugs on murine lung carcinoma, melanoma and human colon adenocarcinoma 15 ; . HLLT et al. 5 ; have found that incubation with 1 g ml VRP is sufficient to increase 13-18 times the cytotoxicity of VBL and other authors 19 ; state that VRP doses of 1.62 and 3.24 g ml produce a relative sensitisation rates from 1.4 to 7.5 for VCR and 1 to 8 for CCH. Chemosensitisation is a complex and multifactorial process, which could depend on the cytotoxic drugs, the type of sensitiser and the dose used, as well as on the quantity of P-Gp expressed by the cell line. Reference Values Leukocyte alkaline phosphatase Periodic acidSchiff stain 13130 U Granulocytes--positive Agranulocytes--negative Granulocytic precursors--negative Erythrocytes--negative Erythrocytic precursors--negative Tartrate-resistant acid phosphatase found in neutrophils. This enzyme is completely independent of serum alkaline phosphatase, which reflects osteoblastic activity and hepatic function. The LAP content of neutrophils increases as the cells mature; therefore, the LAP study is useful in assessing cellular maturation and in evaluating departures from normal differentiation. The LAP study is used to distinguish among various hematologic disorders. For example, LAP increases in polycythemia vera, myelofibrosis, and leukemoid reactions to infections, but decreases in chronic granulocytic leukemia. Because all of these conditions have increased numbers of immature circulating neutrophils, LAP scores can be helpful in differentiating among them and molindone.

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