We begin a systematic study of the enumerative combinatorics of mixed succession rules, which are succession rules such that, in the associated generating tree, the nodes are allowed to produce their sons at several different levels according to different production rules. Here we deal with a specific case, namely that of two different production rules whose rule operators commute. In this situ...

Environmental strains are causing consumers to trade up to greener alternatives and many brown products are losing market coverage to premium-priced green rivals. In order to tackle this threat, many companies currently offering only brown products are contemplating the launch of a green product to complement their product portfolio. This paper provides strategic insights into and tactical rami...

The foundation of all plant production systems is the effective, efficient and dependable means of nutrient delivery to the plant. The nutrient delivery system directly influences the physical components and the plant culture tasks of the plant management technique within the controlled environment agriculture system. The nutrient delivery system can be described in terms of its mechanism for w...

core dental journals according to production and citation rates dr. sdj. ghazi mirsaeid * *assistant professor of medical library and information sciences dept., faculty of allied medical sciences and dental research center, tehran university / medical sciences. abstract background and aim: given the rapid expansion of dental journals in one hand, and limitation of resources on the other, it ma...

Students enrolled in an introductory animal science course (ASG 3003) at the University of Florida were surveyed (n = 788) over a 3-yr period to ascertain their current experience and career goals in animal agriculture. Sixty-one percent of the students indicated that they were from an urban background. Only 4% were raised on a farm or ranch where the majority of family income was attributed to...

In a recent survey by the United States Department of Agriculture (1961) it was estimated that the animal-protein shortage in the deficit countries, in terms of non-fat milk solids, was the equivalent of 1.8 million metric tons or roughly one-third of the U.S. annual milk production. The most critical shortages were noted to be in the Far East, followed by communist Asia, Africa and Latin Ameri...