When cells?but not DNA?from two or more genetically distinct individuals combine to form a new individual, the result is called a chimera. Though chimeras [2] occasionally occur in nature, scientists have produced chimeras [2] in a laboratory setting since the 1960s. During the creation of a chimera, the DNA molecules do not exchange genetic material (recombine), unlike in sexual reproduction o...

OBJECTIVE To develop a method to assist in the design and assessment of animal rabies control campaigns. METHODS A methodology was developed based on geographic information systems to estimate the animal (canine and feline) population and density per census tract and per subregion (known as "Subprefeituras") in the city of São Paulo (Southeastern Brazil) in 2002. The number of vaccination uni...

A common population characteristic of interest in animal ecology studies pertains to the selection of resources. That is, given the resources available to animals, what do they ultimately choose to use? A variety of statistical approaches have been employed to examine this question and each has advantages and disadvantages with respect to the form of available data and the properties of estimat...

Parapoynx crisonalis is an important pest of many aquatic vegetables including water chestnuts. Understanding the relationship between temperature variations and the population growth rates of P. crisonalis is essential to predicting its population dynamics in water chestnuts ponds. These relationships were examined in this study based on the age-stage, two-sex life table of P. crisonalis devel...

When cells?but not DNA?from two or more genetically distinct individuals combine to form a new individual, the result is called a chimera. Though chimeras [2] occasionally occur in nature, scientists have produced chimeras [2] in a laboratory setting since the 1960s. During the creation of a chimera, the DNA molecules do not exchange genetic material (recombine), unlike in sexual reproduction o...

Because of human and livestock population growth, changes in livestock production, the emergence of worldwide agro-food networks, and significant changes in personal mobility, human populations increasingly share a global commons of disease risk, among themselves and with domestic and wild animal species. To elucidate the linkage between livestock production and global public health, this paper...

When cells?but not DNA?from two or more genetically distinct individuals combine to form a new individual, the result is called a chimera. Though chimeras [2] occasionally occur in nature, scientists have produced chimeras [2] in a laboratory setting since the 1960s. During the creation of a chimera, the DNA molecules do not exchange genetic material (recombine), unlike in sexual reproduction o...

animal welfare considerations are becoming increasingly important for farming of animals, both in tunisia and internationally. practices which may have once been deemed acceptable are now being reassessed in the light of new knowledge and changing attitudes. and a clearly defined concept of welfare is needed for use in precise scientific measurements. if animal welfare is to be compared in diff...

Over 90% of human deaths from rabies worldwide are caused by dog bites. Mass vaccination, along with the effective control of dog populations, has been used successfully in industrialised countries to control this disease. A lower success rate in developing countries is due to a number of factors, including vaccination campaigns that do not cover a sufficient number of animals or reach all comm...

Planaria reproduce by transverse fission. Isolated worms increase in number exponentially, while social animals at the same density are inhibited in terms of numerical increase, but over a 25 day period undergo a larger increase in mass. Isolated posterior fission products reproduce faster than isolated anterior fission products. Regulation of population growth is independent of density over a ...