Tens of thousands of man-made chemicals are in everyday use in developed countries. A high proportion of these, or their transformation products, probably reach the aquatic environment. A considerable amount is known about the environmental concentrations of some of these chemicals (such as metals), especially the regulated ones, but little or nothing is known about the majority. In densely pop...

SIR ZACHARY COPE'S book is written and presented in a style no longer acceptable. Some of the content is repetitive, some imaginative and some irrelevant. Nevertheless, the author describes clinical facts and observations of value which we are in danger of overlooking today. If the content of the book was re-styled to make it more incisive then, in a smaller contribution, we would have a more r...

meaning of islamic unity in two internal & external levels of diplomatic idea of islam has superior place. present situation of world of islam and various devilish plots for provoking disputes and enmity among the muslims shows well the necessity of this issue. undoubtedly, the survey of valuable experience of leaders of islamic world unity at present age, especially survey of seyed jamal al-di...

In this issue of the journal Christopher Coope presents three sorts of worries about the use of case studies in medical ethics teaching. The first is that heavy reliance on case studies 'tends to exaggerate the degree to which morality is controversial'; the second is that 'it is often quite unclear what problems count as moral problems'; the third is that there are 'limits as to what we may re...

a case with two simultaneous dens invaginations (dis) and one dens evagination (de) in a permanent maxillary lateral incisor is reported for the first time in a 21-year-old girl. de known as talon cusp of the anterior teeth is a rare entity and its co-existence with di has been reported scarcely in the literature. simultaneous occurrence of two dis with one de has not been reported elsewhere. u...

The genes encoding the ribosomal P-proteins CcP0, CcP1 and CcP2 of Ceratitis capitata were expressed in the conditional P0-null strains W303dGP0 and D67dGP0 of Saccharomyces cerevisiae, the ribosomes of which contain either standard amounts or are totally deprived of the P1/P2 proteins, respectively. The presence of the CcP0 protein restored cell viability but reduced the growth rate. In the W3...

The possibility of separating ascites tumor cells with different numbers of chromo somes by means of counter-streaming centrifugation has been studied with the hy perdiploid Ehnlich ascites tumor (ELD) and its hypertetraploid offshoot (ELT). From ELD a fraction significantly higher in deoxyribonucleic acid phosphorus (DNAP) per cell than the unfractionated suspension was obtained. Inoculated in...

An issue that covers the tiny — the chromo­ somes of m alaria -carry ing mosquitoes — to the massive — the two bil­ lion peop le th o u g h t to be §ee Also affected with the tuberculo­ sis virus — will take center stage for seven panelists in th e N o tre D am e F o ru m today. The second annual forum, entitled “The Global Health Crisis: F o rg in g S o lu tions , Effecting C hange ,” will be ...

There is undoubtedly a huge gap between the level of formality currently in use in mainstream software engineering and the \best practise" advocated by academics and practised by a small sector of industry involved in critical applications. This paper presents some results of recent research which are building bridges between these two approaches: on the one hand, developing formal methods whic...