A topological space X is said to be completely regular if whenever F is a nonempty closed set and x ∈ X \F , there is a continuous function f : X → [0, 1] such that f(x) = 0 and f(F ) = {1}. A completely regular space need not be Hausdorff. For example, ifX is any set with more than one point, then the trivial topology, in which the only closed sets are ∅ and X, is vacuously completely regular,...

Two pygmy chimpanzees (Pan paniscus) have spontaneously begun to use symbols to communicate with people. In contrast to common chimpanzees (Pan troglodytes) using the same communicative system, the pygmy chimpanzees did not need explicit training in order to form referential symbol-object associations. Instead, they acquired symbols by observing others use these symbols in daily communications ...

With the exception of post-exposure prophylaxis for reported rape, no preventive strategy addresses the choice disabled - those who might like to benefit from AIDS prevention but who are unable to do so because they do not have the power to make and to act on prevention decisions. In southern African countries, where one in every three has been forced to have sex by the age of 18 years, a very ...

A code in a graph 0 is a non-empty subset C of the vertex set V of 0. Given C , the partition of V according to the distance of the vertices away from C is called the distance partition of C . A completely regular code is a code whose distance partition has a certain regularity property. A special class of completely regular codes are the completely transitive codes. These are completely regula...

Results of previous investigations indicated that one of the early and essential events occurring in the apical meristem of Sinapis alba L. during the transition to flowering is the release to mitosis of the G(2) nuclei; the trigger to mitosis is generated in the leaves and its movement out of the leaves begins around 16 hours after the start of the inductive treatment. The mitotic wave in the ...

When the fricative noise of a fricative-vowel syllable is replaced by a noise from a different vocalic context, listeners experience delays in identifying both the fricative and the vowel (Whalen, 1984): mismatching the information in the fricative noise for vowel and consonant identity with the information in the vocalic segment appears to hamper processing. This effect was argued to be due to...

Sir, I was not surprised that Dr Flytström and co-workers failed to cultivate Candida in the intertriginous areas of psoriatics (1). As I showed, over 30 years ago, Candida acts as a primer and disappears when Gram-negative bacteria come along to replace it (2). This does not mean that the yeast is unable to do harm to the skin. Once applied on the folding skin where occlusion is provided, it p...

It’s not easy being empathic. However, unlike snowboarding or yodeling or decoupage, most people manage to pick up empathy skills naturally without the aid of special lessons or designated practice sessions. Knowing what someone else is thinking and feeling allows people to coordinate their activities, something that is useful and necessary in interpersonal interactions. Like any skill, empathy...