Eastern Colombia Research Articles

Climate and Vegetation in the Villavicencio Region of Eastern Colombia

Climate and Vegetation in the Villavicencio Region of Eastern Colombia

Geology of Maracaibo Basin, Venezuela: PART 1

Geology of Maracaibo Basin, Venezuela: PART 1

The Cretaceous of Colombia: ABSTRACT

During the Cretaceous varying amounts of marine and non-marine sediments were deposited in the North Andean geosyncline which passed through Venezuela, Colombia, and Ecuador. During the maximum period of flooding, all except extreme Western Colombia, part of Eastern Colombia, and a few islands appear to have been covered by the seaway. The Cretaceous sediments usually begin with a sandstone or limestone, which is followed by a thick sequence of black shales with occasional limestone members. Following the black shales, there is a more or less cherty shale or limestone, which is followed by either sands and shales or shales and limestones. The thickness of the sediments varies from around 2,000 feet to more than 40,000 feet. Marine faunas are often abundant and show marked relationships to both the Gulf Coast and the European Cretaceous faunas. From the faunas collected at various localities it appears that most, if not all of the standard Cretaceous section is represented in Colombia. End_of_Article - Last_Page 2089------------

Observations on Climate and Seasonal Distribution of Mosquitoes in Eastern Colombia

Observations on Climate and Seasonal Distribution of Mosquitoes in Eastern Colombia

The Isolation of Three Neurotropic Viruses from Forest Mosquitoes in Eastern Colombia

During the course of studies of the epidemiology of jungle yellow fever in Eastern Colombia large numbers of wild caught mosquitoes were inoculated in white mice with the object of attempting to recover virus. Virus of yellow fever was recovered several times, as described in a paper by Bugher er al.1 Viruses that proved to be immunologically distinct from yellow fever, but that caused similar encephalitic symptoms in mice, were also recovered on 3 occasions. Two of these were iso-

The Susceptibility to Yellow Fever of the Vertebrates of Eastern Colombia

Introduction Jungle yellow fever was first recognized in eastern Colombia in the Intendencia del Meta in August of 1934, when an outbreak began in the vicinity of the town of Restrepo and continued through February, 1935. In the latter half of 1935, the disease appeared near the towns of Villavicencio and Acacias; and during the last eight months of 1936, cases occurred in all three regions. The year 1937 saw a few cases in the lower reaches of the rivers draining the previously involved areas and following these cases, no further ones were recognized in the Acacias-Villavicencio-Restrepo area proper up to the period covered by this report (July 1940). The details of these outbreaks have been reported in a previous publication (1). A study of the findings led to the decision to initiate intensive investigations of the region, especially with respect to the arthropod and vertebrate fauna, to determine the relationships of these various forms of life to the epidemiology of the disease in man.

The Demonstration of Yellow Fever Antibodies in Animal Sera by the Intracerebral Protection Test in Mice 1

Summary and Conclusions 1. The technic for a modified intracerebral yellow fever protection test in mice is described, together with a discussion of the factors to be standardized. 2. Judgments of antibody content of a serum are best based upon a detailed knowledge of the behavior of known non-antibody containing sera of the same species in a properly balanced and controlled protection test. 3. Some groups of animals (and probably some birds) exhibit a non-specific activity against yellow fever virus, and protection tests with sera of these animals require more than the usual amount of virus. 4. Standards of negativity are established for the mammals and some of the birds of Eastern Colombia. 5. The use of the average survival time to measure protection test results is described.