the effect of a neuropeptide, the tachykinin on α-amylase, protease and lipase activities in the midgut of american cockroach, periplaneta americana (linnaeus) is evaluated . immunohistochemical reactivities against tachykinin (tachykinin- ir) were detected in the midgut. tachykinin-ir cells in three regions (anterior, median and posterior) of the midgut were counted in normally fed, starved fo...

Godmania macrocarpa Hemsley, a deciduous tree characteristic of fire protected areas of the savanna region of central Venezuela, was more drought tolerant, allocated more N to leaves and had consistently higher photosynthetic rates than Curatella americana L., a ubiquitous species growing successfully within the grasslands of tropical American savannas. Godmania macrocarpa maintained higher lea...

Postzygotic reproductive isolation evolves when hybrid incompatibilities accumulate between diverging populations. Here, I examine the genetic basis of hybrid male sterility between two species of Drosophila, Drosophila virilis and D. americana. From these analyses, I reach several conclusions. First, neither species carries any autosomal dominant hybrid male sterility alleles: reciprocal F(1) ...

Abstract: Introduction: Periplaneta americana (P. americana), commonly known as the American cockroach, has shown multiple clinical benefits. Small Peptides from P. (SPPA) was found to have promising antioxidative effects in vitro. However, pharmacological benefits of SPPA demand further in-depth investigation underlying mechanism for its effect remain unexplored. Objectives: To evaluate on ova...

An anxiolytic fraction of Tilia americana standardized in tiliroside, rutin, quercitrin, quercetin glucoside, and kaempferol was obtained. After oral administration of the fraction, the above-mentioned flavonoids were not detected in plasma over 24 h. However, meta and para hydroxyphenylacetic acid and dihydroxyphenylacetic acid (m-HPAA, p-HPAA and DOPAC) were monitored. These are the biotransf...

The spatial structure of Uroglena americana was detected using an autonomous underwater vehicle equipped with a submersible microscope, video recording system and water quality monitoring sensors. Uroglena americana colonies were enumerated via image analysis and pattern recognition methods. This quantitative technique is useful for understanding plankton assemblages, distributions and their po...

1Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas (UNICAMP), 13083-970 Campinas, SP, Brazil 2Department of Biomedical Science, Faculdade de Americana, Avenida Joaquim Boer 733, 13477-360 Americana, SP, Brazil 3Medical School, UNICAMP, 13083-887 Campinas, SP, Brazil 4Department of Biochemistry and Microbiology, Institute of Biosciences, Universidade E...

This study evaluated the natural prey preferences and spatial variability of predation pressure (PP = proportion of colonies with snails and/or clear predation signs) by the gastropod Cyphoma gibbosum on octocoral communities off the La Parguera Natural Reserve, Puerto Rico. All octocoral colonies were checked for presence of C. gibbosum and/or clear predation signs in four permanent band-trans...

Infections caused by Ewingella americana have been rarely reported in the literature. Most of the cases that have been reported were among the immunocompromised patients. We report a case of E. americana causing osteomyelitis and septic arthritis of the shoulder joint in a previous intravenous drug abuser. The causative pathogen was identified by synovial fluid analysis and culture.