Land cover, land use and malaria in the Amazon: a systematic literature review of studies using remotely sensed data

The nine countries sharing the Amazon forest accounted for 89% of all malaria cases reported in the Americas in 2008. Remote sensing can help identify the environmental determinants of malaria transmission and their temporo-spatial evolution. Seventeen studies characterizing land cover or land use features, and relating them to malaria in the Amazon subregion, were identified. These were reviewed in order to improve the understanding of the land cover/use class roles in malaria transmission. The indicators affecting the transmission risk were summarized in terms of temporal components, landscape fragmentation and anthropic pressure. This review helps to define a framework for future studies aiming to characterize and monitor malaria

Determination of sodium fatty acid in soap Formulation Using Fourier Transform Infrared (FTIR) spectroscopy and multivariate calibrations.

Fourier Transform Infrared (FTIR) spectroscopy using an attenuated total reflectance (ATR) accessory has been investigated as a method for the determination of sodium-fatty acid (sodium-FA) in soap formulations. Multivariate calibrations namely partial least squares regression (PLS) and principle component regression (PCR) were developed for the prediction of sodium-FA using spectral ranges on the basis of relevant IR absorption bands related to sodium-FA. The sodium-FA content in soap formulations was predicted accurately at wavenumbers of 1,570–1,550 cm−1, which is specific for RCOO− Na+ vibration. The PLS method was found to be a consistently better predictor when both PLS and principal component regression (PCR) analyses were used for quantification of sodium-FA. Furthermore, FTIR spectroscopy can be an alternative technique to American oil Chemist Society methods which use a titrimetric technique because FTIR offers rapid, easy sample preparation and is friendly to the environment

Serum ferritin is an independent risk factor for acute respiratory distress syndrome in COVID-19

Increased ferritin levels could be indicative of a strong inflammatory reaction in COVID-19 and recent studies suggest that increased levels of circulating ferritin levels play a critical role by contributing to the development of a cytokine storm. In this regard, ferritin evaluation could be an early, available and easy to use screening tool to assess the disease severity at the first admission in the emergency department. This test might be of crucial importance for the timely identification of patients at higher risk of an adverse outcome

LA FLORA E LA MESOFAUNA DI SATRIANUM

Il sito di Satrianum si dispone tra le due vallate del Melandro e del Noce, in connessione con un’articolata rete idrografica facente capo ai fiumi Agri e Basento . Tutta l’area che circonda l’altura, è caratterizzata da terreni che si dispiegano tra gli 800 e i 600 m. s.l.m., e presenta un habitat montano ideale per le colture cerealicole, per le distese boschive e per la pastorizia. Notizie del sito si attestano fin dall’età altomedievale (Agiografia di San Laviero, 1162). In età normanna la città aveva un dominus e la sede vescovile come testimoniano le fonti documentarie. L’impianto insediativo si presenta racchiuso da mura di cinta, con all’ interno, oltre alle strutture abitative, i due poli del potere politico e religioso: la torre, a pianta quadrata, ubicata in posizione decentrata rispetto all’insediamento, e la cattedrale. L’abbandono di Satrianum avvenne nel corso del XV secolo, probabilmente a seguito di un grave evento sismico ma continuò ad essere frequentato in maniera sporadica fino al XVIII secolo. Nell’ottica di comprendere e ricreare un ambiente passato è stata effettuata una ricognizione e l’identificazione della flora e della mesofauna esistente. Alla fine è stato realizzato un erbario e un insettario

Preference of substrate for oviposition of Mansonia Blanchard (Culicidae, Mansoniini) from Porto Velho, State of Rondônia, Brazil

Mosquitoes of the genus Mansonia are aggressive and potential vectors of diseases. Immature forms extract oxygen from aquatic macrophytes, common in lentic ecosystems such as dams and lakes. This biological characteristic makes its maintenance in the laboratory challenging. The present study aimed to evaluate the oviposition preference of Mansonia in different species of macrophytes, and in polystyrene sheets. Four species were studied; Mansonia humeralis, Ma. amazonensis, Ma. titillans and Ma. indubitans. The specimens were obtained in the community of São Domingo, located in Porto Velho, Rondônia.Para acceder a la videoconferencia completa, hacer clic en "Enlace externo".Sociedad Latinoamericana de Ecología de Vectore

Evaluation of long-lasting microbial larvicide for malaria vector control in Kenya

BACKGROUND: Outdoor malaria transmission is becoming an increasingly important problem in malaria control in Africa. Larval control is a promising intervention as it can target both indoor and outdoor biting mosquitoes. However, the currently available biolarvicide formulations have a short effective duration, and consequently larval control incurs a high operational expense due to the requirement for frequent re-treatment of larval habitats. Formulations of biolarvicides with long-lasting effects is highly desired. A recently developed FourStar® slow-release briquet formulation of Bacillus thuringiensis israelensis and Bacillus sphaericus was evaluated to test its efficacy on malaria vectors. METHODS: The study evaluated FourStar™ briquets 180-days formulation under semi-natural and natural conditions to test their efficacy in reducing the mosquito population in western Kenya. The semi-natural habitats used the formulation dissolved in rainwater with appropriate concentrations, and second-instar larvae of Anopheles gambiae were introduced and the number of surviving larvae and pupae produced was recorded daily as the outcome. The briquets formulation was then tested in natural habitats for efficacy on pupal productivity reduction in highland and lowland sites in western Kenya. The formulation was finally tested for efficacy in reducing adult mosquito populations in randomized clusters in western Kenya highland. RESULTS: In semi-natural conditions, the FourStar™ briquets 180-days formulation completely inhibited mosquito pupal production in the first 3 months, and then reduced pupal productivity by 87–98% (P < 0.001) 4–6 months after application. In natural habitats, during the first 2 months no pupae were detected from any of the treated habitats in highland sites, and Anopheles spp. pupal density was reduced by 60–90% in the next 3–5 months (P < 0.001). In the lowland site, pupal productivity reduction was 100% in the first 3 months, and 75–90% in the next 4–5 months (P < 0.001). The randomized cluster trial found that the application of the briquets formulation reduced mean densities of indoor-biting mosquitoes by 76–82% (P < 0.001) and by 67–75% (P < 0.001) for outdoor-biting mosquitoes. CONCLUSION: This study demonstrated that long-lasting biological larviciding was effective in reducing pupal productivity of larval habitats, and reducing indoor and outdoor resting mosquitoes. The study suggests that long-lasting microbial larviciding may be a promising complementary malaria vector control tool and warrants further large-scale evaluation