Here we present first observations, from instrumentation installed on moorings and a float, of unexpectedly low (< 2 μmolkg) oxygen environments in the open waters of the tropical North Atlantic, a region where oxygen concentration does normally not fall much below 40 μmolkg. The low-oxygen zones are created at shallow depth, just below the mixed layer, in the euphotic zone of cyclonic eddies a...

Radiol Bras. 2015 Mar/Abr;48(2):IX The so called “tropical” infections are those typically found in the regions between the tropics of Cancer and Capricorn. In the past, such infections were found in the temperate zones of the earth. Examples to be mentioned include the Black Death occurred in Europe in the middle ages, and also ancylostomiasis and malaria, in the United States of America, earl...

Degradation of coastal water quality in the form of low dissolved oxygen levels (hypoxia) can harm biodiversity, ecosystem function, and human wellbeing. Extreme hypoxic conditions along the coast, leading to what are often referred to as "dead zones," are known primarily from temperate regions. However, little is known about the potential threat of hypoxia in the tropics, even though the known...

Groundwater, being a vital resource, needs to be developed with proper understanding about its occurrence in time and space. Unscientific sand mining is a dominant environmental issue in this humid tropical river basin namely Bharathapuzha river basin geographically on central part of Kerala state, southwest part of India. The sandy layers along the river course declines its water holding capac...

Tropical infectious disease prevalence is dependent on many socio-cultural determinants. However, rainfall and temperature frequently underlie overall prevalence, particularly for vector-borne diseases. As a result these diseases have increased prevalence in tropical as compared to temperate regions. Specific to tropical Africa, the tendency to incorrectly infer that tropical diseases are unifo...

Diphtheria as an epidemic disease is comparatively infrequent in tropical countries. There is evidence, however, that the disease is endemic in India and in other equatorial zones. From studies made in a number of countries, the epidemiology of the disease has become more easily understood than before. Certain features may, therefore, be now fitted into the epidemiological conception of this an...