Search results for " tropi"

Analyze and simulation a dynamic of soil indicators fertility under different agricultural management practices in cotton area of Togo

2011

Using data observed during 20 to 40 years in different agro-ecosystems of Togo, we analyzed soil fertility dynamic under different agricultural management practices. Tree soil C models of varying complexity were tested, and the most accurate in terms of soil C dynamics description in these tropical soils was associated with the QUEFTS model and with nutrient partial balance to analyze the effect of each agricultural management practice. Results indicated that, although fertilizers N, P and K were continuously applied at a recommended rate by the research (RR) or at this rate increased in 50% (1.5RR), initial cotton and cereals yields of 1.5 to 2 t ha˗1 and 2 to 3 t ha˗1, respectively, decre…

Fragmentation des habitats et interactions hôtes-parasites

2021

Habitat fragmentation is one of the main threats to global biodiversity and despite an abundant literature on the impact of fragmentation on species abundance and diversity, the consequences of this global change in terms of ecological and evolutionary processes remain poorly understood. Beyond their direct contribution to biodiversity, as species-rich category of organisms, parasites could be involved in biodiversity change as key actors of ecological and evolutionary processes. The present work aims to understand the effect of forest fragmentation on host-parasite interactions. It is based on a large sampling carried out in the Lesser Antilles and in French Guiana, and allowing the obtent…

Construction, validation et amélioration continue de banque de spectres pour l’utilisation en routine de la spectrométrie de masse en mycologie médic…

2012

Résumé publié dans: Journal de Mycologie Médicale / Journal of Medical Mycology, sept. 2012, 55(3): 279-280. doi:10.1016/j.mycmed.2012.07.024; National audience

Ressources naturelles et développement dans le monde tropical : les contradictions entre dynamiques écologiques, reproduction sociale et ordre économ…

2013

Natural resources are in the midst of contradictory dynamics. While they are essential to the reproduction of societies and life, actual organization of the world economy subordinates them to logics of accumulation. In addition to the fact that these logics don't take into account (consider) the physical limits inside of which humanity evolves, they induce problematic socio-ecological inequalities at different scales. Indeed, actual international economic order tends to generate ecologically unequal exchanges, which disrupt the development of primary exporting countries and threaten the most vulnerable populations and ecosystems inside of them.Tropics are the typical context in which such c…

Base de datos del biovolumen de microalgas en 30 lagunas someras de la costa pacífica de Nicaragua y Costa Rica [Dataset]

2015

Esta base de datos contiene la densidad de las microalgas encontradas en 30 lagunas costeras de la costa pacífica de Nicaragua y Costa Rica en tres periodos de su año hidrológico: comienzo de las lluvias (junio 2010), plena inundación (septiembre 2010) y sequía (enero 2011). La recolección fue subsuperficial. En esta matriz de datos las filas son las diferentes especies encontradas y las columnas la muestra (laguna y fecha). Información geográfica y limnológica de las lagunas se puede encontrar en Sasa et al. (2015: Limnetica vol 34).

Failure to differentiate Cryptosporidium parvum from C. meleagridis based on PCR amplification of eight DNA sequences.

1998

ABSTRACT In order to determine the specificities of PCR-based assays used for detecting Cryptosporidium parvum DNA, eight pairs of previously described PCR primers targeting six distinct regions of the Cryptosporidium genome were evaluated for the detection of C. parvum , the agent of human cryptosporidiosis, and C. muris , C. baileyi , and C. meleagridis , three Cryptosporidium species that infect birds or mammals but are not considered to be human pathogens. The four Cryptosporidium species were divided into two groups: C. parvum and C. meleagridis , which gave the same-sized fragments with all the reactions, and C. muris and C. baileyi , which gave positive results with primer pairs targ…

ChemInform Abstract: One-Step Synthesis, Crystallographic Studies and Antimicrobial Activity of New 4-Diazopyrazole Derivatives.

2010

Summary A number of new 4-diazopyrazole derivatives were prepared by the reaction of 1- R -3-methyl-5(R 1 -substituted)benzamidopyrazoles with a sevenfold excess of nitrous acid in acetic medium. The compounds were tested for activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus faecalis, Listeria monocytogenes, Candida albicans, Candida tropicalis and Paecilomyces varioti . The highest microbial susceptibility was shown by Gram-positive bacteria, with minimum inhibitory concentrations (MIC) in the range 0.5–12.5 μg/mL. For S aureus the R 1 substituents were screened utilizing the Topliss operational scheme. The 4-nitro g…

Rickettsiae of the spotted fever group in dog fleas (Ctenocephalides spp.) in Western Sicily

1989

Gut Microbiome Analysis In Adult Tropical Gars (Atractosteus tropicus)

2019

AbstractTropical gar (Atractosteus tropicus), is freshwater and estuarine fish that has inhabited the Earth since the Mesozoic era, undergoing limited physiological variation ever since. This omnivorous fish is endemic to southern Mexico and part of Central America. Besides its recognized cultural and scientific relevance, the species has seen remarkable growth in its economic impact due to pisciculture. Previous studies have highlighted the role of microbial communities in fish, particularly those in the gut microbiome, in maintaining their host homeostasis or disease. In this study, we present the first report of the whole taxonomic composition of microbial communities in gut contents of …

Malaria and the heart: Two rare case reports of plasmodium falciparum-associated pericarditis

2017

Malaria is one of the most important parasitic diseases in the world, causing significant mortality and morbidity in the tropical regions1 . Although symptoms can range from a mild fever to severe complicated forms, there are limited published data on cardiac involvement of malaria and only a few studies have been carried out regarding cardiac function in severe malaria2–3. Cardiac involvement in the course of malaria ranges from severe forms with hypatension, shock, circulatory collapse and impaired haemodynamic function, to mild disorders documented by Electrocardiogram (ECG) and echocardiography4–6. Pericardial involvement in malaria is a very rare event7–8. We report here two cases of f…