Most flowers display distinct colour patterns comprising two different areas. The peripheral large-area component of floral colour patterns attracts flower visitors from some distance and the central small-area component guides flower visitors towards landing sites. Whereas the peripheral colour is largely variable among species, the central colour, produced mostly by anthers and pollen or poll...

Understanding the mechanism(s) that favour cooperation among individuals competing for the same resources provides direct insights into the evolution of grouping behaviour. In a hybrid zone between golden-/yellow-collared (Manacus vitellinus) and white-collared (Manacus candei) manakins, males form aggregations composed of white and yellow males solely to attract females ('mixed leks'). Previou...

In the last two decades, yellow fever re-emerged with vehemence to constitute a major public health problem in Africa. The disease has brought untold hardship and indescribable misery among different populations in Africa. It is one of Africa's stumbling blocks to economic and social development. Despite landmark achievements made in the understanding of the epidemiology of yellow fever diseas...

1MD, Infectious Disease Specialist, Hospital Israelita Albert Einstein, Sociedade Brasileira de Infectologia. MSc in Medicine – Infectious and Parasitic Diseases, Faculdade de Medicina da Universidade de São Paulo (FMUSP). PhD in Medicine – Infectious and Parasitic Diseases, FMUSP. Fellow American College of Physicians, São Paulo, SP, Brazil 2MD, Infectious Disease Specialist, Hospital Israelit...

Both presidential candidates talk about changes in health care and a reinvestment in biomedical research, but we need to influence what happens before and after the election. Both presidential candidates have been touched by cancer. John McCain has had a number of melanomas, and Barack Obama’s mother died of ovarian cancer. Do you ever wonder how their personal experiences affect their healthca...

Baboons live in a complex and changing world. They cope by being adaptable. Like humans, they specialize in being unspecialized, a mode of life that depends on an ability to shift to alternatives when the primary mode of adaptation is no longer viable. This flexibility is clearly revealed in the development of infant baboons, for whom success often depends on their own abilities and those of th...

abstract hop stunt viroid (hsvd) and citrus tristeza virus (ctv) are the causal agents of most important diseases of citrus. previously we reported a novel variant of hsvd that constantly associated with the yellow corky vein disease. here, 19 individual citrus leaves with yellow corky vein symptoms were sampled for ctv by elisa. in this study, most symptomatic samples were found to be infected...

What interest has India got in yellow fever ? The reply to this question is supplied by a paper by Dr. Patrick Manson " On the Panama Canal and the Introduction of Yellow Fever into Asia" read at a meeting of the Epidemiological Society of London held on the 25th of February. The epidemiology of yellow fever is very remarkable. It has a very limited area of habitual prevalence and likewise a li...

We have identified a viable-yellow and a lethal-yellow chlorophyll-deficient mutant in soybean. Segregation patterns suggested single-gene recessive inheritance for each mutant. The viable- and lethal-yellow plants showed significant reduction of chlorophyll a and b. Photochemical energy conversion efficiency and photochemical reflectance index were reduced in the viable-yellow plants relative ...

Yellow fever continues to occur in regions of Africa and South America, despite the availability of effective vaccines. Recently, some cases of severe neurologic disease and multiorgan system disease have been described in individuals who received yellow fever vaccine. These events have focused attention on the need to define criteria for judicious use of yellow fever vaccine and to describe th...