Studies of the functions of the cortex anterior to the motor regions of the brain have a venerable history. In non-human primates resections of this frontal eugranular cortex have been known for almost half a century to produce a very specific deficit in tasks characterized by the interposition of a delay between the occasion when a behavioral response is cued and when that response can be carr...

be the Hirzebruch L-class of an oriented manifold M. Let B (or K(; 1)) denote any aspherical space with fundamental group. (A space is aspherical if it has a contractible universal cover.) In 1970 Novikov made the following conjecture. Many surveys have been written on the Novikov Conjecture. The goal here is to give an old-fashioned point of view, and emphasize connections with characteristic ...

The arterial switch operation, also called the Jatene procedure, is an operation in which surgeons redirect the flow of blood through abnormal hearts. In 1975, Adib Jatene conducted the first successful arterial switch operation on a human infant. The arterial switch operation corrects a condition called transposition of the great arteries, abbreviated TGA, also called transposition of the grea...

The range of the radiocarbon dating method can be extended by about 20,000 years by means of thermal diffusion isotopic enrichment. A description of the Clusius-Dickel type enrichment columns and their operation is given. Prior to enrichment the carbonaceous sample material is combusted to C0 2 and then reduced to CO. The enriched sample is re-oxidized to C0 2 . The combustion-, reductionand ox...

The complexation of cadmium by isocitrate has been studied at 25 °C and pH 7.5 in a range of ionic strength from 0.01 to 0j16. The formation constant of the complex between cadmium and tribasic isocitrate varies from 860 M-1 at ^ = 0 .1 6 to approximately 24,500 M -1 at infinite dilu­ tion. These data allow the distribution of the chemical forms of cadmium added to the incubation mixtures for t...

BACKGROUND Since the genocide occurred in 1994, Rwanda has faced up to the challenge of rebuilding. Public health is a main field to understand this rebuilding. OBJECTIVES In this paper, the aim was to map the scientific research on public health in Rwanda after the genocide and to present the links between different financing systems. METHODS We used bibliographic analyses with Web of Scie...

A questionnaire relating to smoking habits, respiratory symptoms, and health attitude was administered to schoolchildren aged between 11 and 17 throughout a defined geographical area in both 1975 and 1979, with a valid response from 10498 and 12002 young people respectively. Each cohort was almost entirely different. The results suggest that although the prevalence of regular smoking has decrea...

ALL BUT A FEW countnes throughout the world hsd one or more public progrtlms provldmg some type of social security protectlo* m 1977. Some of these programs date back to the late 19th century and contam extensive provwons Some other systems-pnrtlculsrly those of the 60 countries that obtamed their independence during the past two decades-are much ne\\er and, as a consequence, are still quite ln...