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https://www.readbyqxmd.com/read/28340457/dermal-exposure-of-applicators-to-chlorpyrifos-on-rice-farms-in-ghana
#1
Albert Atabila, Dung Tri Phung, Jonathan N Hogarh, Paul Osei-Fosu, Ross Sadler, Des Connell, Cordia Chu
Studies evaluating dermal exposure to pesticides among applicators in tropical countries have largely been conducted using the patch dosimetry and hand wiping/washing techniques. This study used the more accurate whole-body dosimetry technique to evaluate dermal exposure to chlorpyrifos among applicators on rice farms in Ghana. The exposure levels were plotted as Cumulative Probability Distribution (CPD). Total Dermal Exposure (TDE) of chlorpyrifos among the median exposed and the 5% highly exposed groups during a spray event were 24 mg and 48 mg, respectively...
March 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28340328/the-role-of-auxin-response-factors-in-the-development-and-differential-growth-of-inflorescence-stems
#2
Nicholas S Carey, Naden T Krogan
Plants react to environmental cues by altering their growth and development, which can include organ tropic responses. These differential growth responses are triggered by the hormone auxin, and AUXIN RESPONSE FACTORs (ARFs) have been implicated in numerous organ tropisms in Arabidopsis thaliana. Surprisingly, despite being critical for light capture and overall plant morphology, inflorescence stem tropic responses remain relatively understudied, with presumed direct links to ARF function yet to be established...
March 24, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28339543/climatic-factors-and-prevalence-of-campylobacter-in-commercial-broiler-flocks-in-thailand
#3
S Prachantasena, P Charununtakorn, S Muangnoicharoen, L Hankla, N Techawal, P Chaveerach, P Tuitemwong, N Chokesajjawatee, N Williams, T Humphrey, T Luangtongkum
Campylobacter are bacteria associated with human foodborne disease worldwide. Poultry and poultry products are generally considered as a main source of these organisms. Compared to temperate zones, baseline information on Campylobacter in tropical regions is limited. Thus, the objectives of the present study were 1) to determine the prevalence of Campylobacter in Thai broiler flocks and 2) to investigate the association between climatic factors (i.e., rainfall, ambient temperature, and relative humidity) and Campylobacter colonization status of broiler flocks in Thailand...
October 6, 2016: Poultry Science
https://www.readbyqxmd.com/read/28335411/how-the-cobra-got-its-flesh-eating-venom-cytotoxicity-as-a-defensive-innovation-and-its-co-evolution-with-hooding-aposematic-marking-and-spitting
#4
Nadya Panagides, Timothy N W Jackson, Maria P Ikonomopoulou, Kevin Arbuckle, Rudolf Pretzler, Daryl C Yang, Syed A Ali, Ivan Koludarov, James Dobson, Brittany Sanker, Angelique Asselin, Renan C Santana, Iwan Hendrikx, Harold van der Ploeg, Jeremie Tai-A-Pin, Romilly van den Bergh, Harald M I Kerkkamp, Freek J Vonk, Arno Naude, Morné A Strydom, Louis Jacobsz, Nathan Dunstan, Marc Jaeger, Wayne C Hodgson, John Miles, Bryan G Fry
The cytotoxicity of the venom of 25 species of Old World elapid snake was tested and compared with the morphological and behavioural adaptations of hooding and spitting. We determined that, contrary to previous assumptions, the venoms of spitting species are not consistently more cytotoxic than those of closely related non-spitting species. While this correlation between spitting and non-spitting was found among African cobras, it was not present among Asian cobras. On the other hand, a consistent positive correlation was observed between cytotoxicity and utilisation of the defensive hooding display that cobras are famous for...
March 13, 2017: Toxins
https://www.readbyqxmd.com/read/28335329/nanoparticle-based-delivery-of-anaplasma-marginale-membrane-proteins-virb9-1-and-virb10-produced-in-the-pichia-pastoris-expression-system
#5
Bing Zhang, Antonio S Cavallaro, Karishma T Mody, Jun Zhang, James R Deringer, Wendy C Brown, Timothy J Mahony, Chengzhong Yu, Neena Mitter
Bovine anaplasmosis or cattle-tick fever is a tick-borne haemolytic disease caused by the rickettsial haemoparasite Anaplasma marginale in tropical and subtropical areas of the world. While difficult to express, the proteins VirB9-1 and VirB10 are immunogenic components of the outer membrane type IV secretion system that have been identified as candidate antigens for vaccines targeting of A. marginale. Soluble VirB9-1 and VirB10 were successfully expressed using Pichia pastoris. When formulated with the self-adjuvanting silica vesicles, SV-100 (diameter: 50 nm, and pore entrance size: 6 nm), 200 µg of VirB9-1 and VirB10 were adsorbed per milligram of nanoparticle...
November 5, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334826/military-officers-tropical-medicine-and-racial-thought-in-the-formation-of-the-west-india-regiments-1793-1802
#6
Michael Joseph
No abstract text is available yet for this article.
March 9, 2017: Journal of the History of Medicine and Allied Sciences
https://www.readbyqxmd.com/read/28334323/interspecific-competition-between-ceratitis-capitata-and-two-bactrocera-spp-diptera-tephritidae-evaluated-via-adult-behavioral-interference-under-laboratory-conditions
#7
Hui Liu, Can Zhang, Bo-Hua Hou, Ge-Cheng Ou-Yang, Jun Ma
The Mediterranean fruit fly, Ceratitis capitata (Wiedemann), is considered one of the most invasive tephritid species. It has spread and established populations successfully throughout many of the tropical temperate regions, partially owing to the increase in global trading activity that facilitates diffusion of species. However, C. capitata has never been detected in China, even though some areas of the country have favorable climate and ample food resources. Historically, some researchers have hypothesized that the principal reasons for its absence are the defenses mounted by native Bactrocera species against C...
March 15, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334287/climate-trends-in-the-wood-anatomy-of-acacia-sensu-stricto-leguminosae-mimosoideae
#8
Nigel W M Warwick, Luke Hailey, Kerri L Clarke, Peter E Gasson
Background and Aims: This study investigates the structural diversity of the secondary xylem of 54 species of Acacia from four taxonomic sections collected across five climate regions along a 1200 km E-W transect from sub-tropical [approx. 1400 mm mean annual precipitation (MAP)] to arid (approx. 240 mm MAP) in New South Wales, Australia. Acacia sensu stricto ( s.s. ) is a critical group for understanding the effect of climate and phylogeny on the functional anatomy of wood. Methods: Wood samples were sectioned in transverse, tangential and radial planes for light microscopy and analysis...
March 9, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28334221/enhanced-pest-ant-control-with-hydrophobic-bait
#9
R K Vander Meer, D E Milne
The red imported fire ant, Solenopsis invicta (Buren), left most of its natural enemies behind in South America when it arrived in Mobile, AL, in the 1930s and spread rapidly throughout the southeastern United States, reaching population levels up to 10 times those found in South America. The large population densities and propensity for disturbed habitats led to direct conflict with human activities. Bait control methods were first developed for fire ants in the early 1960s and little has changed in the subsequent decades, despite the drawback that the bait carrier rapidly breaks down when wet...
February 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334099/sex-differences-and-plasticity-in-dehydration-tolerance-insight-from-a-tropical-liverwort
#10
Rose A Marks, James F Burton, D Nicholas McLetchie
No abstract text is available yet for this article.
November 10, 2016: Annals of Botany
https://www.readbyqxmd.com/read/28334050/improving-transcriptome-de-novo-assembly-by-using-a-reference-genome-of-a-related-species-translational-genomics-from-oil-palm-to-coconut
#11
Alix Armero, Luc Baudouin, Stéphanie Bocs, Dominique This
The palms are a family of tropical origin and one of the main constituents of the ecosystems of these regions around the world. The two main species of palm represent different challenges: coconut (Cocos nucifera L.) is a source of multiple goods and services in tropical communities, while oil palm (Elaeis guineensis Jacq) is the main protagonist of the oil market. In this study, we present a workflow that exploits the comparative genomics between a target species (coconut) and a reference species (oil palm) to improve the transcriptomic data, providing a proteome useful to answer functional or evolutionary questions...
2017: PloS One
https://www.readbyqxmd.com/read/28334021/the-effect-of-remnant-forest-on-insect-successional-response-in-tropical-fire-impacted-peatland-a-bi-taxa-comparison
#12
Kok-Boon Neoh, Lee-Jin Bong, Ahmad Muhammad, Masayuki Itoh, Osamu Kozan, Yoko Takematsu, Tsuyoshi Yoshimura
Fire has become a common feature in tropical drained peatlands, and it may have detrimental impacts on the overall biodiversity of the forest ecosystem. We investigated the effect of fire on termite and ant assemblages and the importance of remnant forest in restoring species diversity in fire-impacted tropical peat swamp forests. The species loss of both termites and ants was as high as 50% in some fire-impacted peats compared to remnant forests, but in most cases the species richness for termites and ants was statistically equal along the land uses surveyed...
2017: PloS One
https://www.readbyqxmd.com/read/28333400/an-improved-model-of-the-trypanosoma-brucei-ctp-synthetase-glutaminase-domain-acivicin-complex
#13
Juliana Oliveira de Souza, Alice Dawson, William Nigel Hunter
The natural product acivicin inhibits the glutaminase activity of CTP synthetase and is a potent lead compound for drug discovery in the area of neglected tropical diseases, specifically trypanosomaisis. A 2.1 Å resolution crystal structure of the acivicin adduct with the glutaminase domain from Trypanosoma brucei CTP synthetase has been deposited in the Protein Data Bank and provides a template for structure-based approaches to design new inhibitors. However, our assessment of that data identified deficiencies in the model...
March 23, 2017: ChemMedChem
https://www.readbyqxmd.com/read/28333074/assessment-of-the-anti-hyperglycaemic-anti-inflammatory-and-antioxidant-activities-of-the-methanol-extract-of-moringa-oleifera-in-diabetes-induced-nephrotoxic-male-wistar-rats
#14
Elizabeth I Omodanisi, Yapo G Aboua, Oluwafemi O Oguntibeju
Diabetes mellitus is an endocrine disease of multiple aetiologies in insulin secretion. A deficiency in insulin results in hyperglycemia with metabolic disturbances of biomolecules. Moringa oleifera (MO) is endemic in the tropics with a variety of ethnomedicinal importance. The leaf of this plant has been reported to possess antioxidant and medicinal properties that may be helpful in the treatment and management of diabetes and its associated complications. Diabetes was induced intraperitoneally in rats by a single dose of streptozotocin (55 mg/kg) and treated with methanolic extract of Moringa oleifera (250 mg/kg b...
March 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28332930/vertical-profiling-and-modelling-of-e-coli-decay-in-a-shallow-maturation-pond-operating-in-a-tropical-climate
#15
Daniel F C Dias, Marcos von Sperling
Maturation ponds are excellent natural treatment systems for disinfecting domestic wastewater from pathogenic bacteria because of great sunlight exposure through depth and high pH and DO values within its environment, all of which are important factors for disinfection. E. coli removal is higher closer to the surface of the pond and proceeds to decrease due to the limited amount of sunlight penetrating through deeper depths. In order to quantify the decay coefficients (Kb) of E. coli in a shallow maturation pond, quartz vessels were used to create isolated batch experiments and submerged at different depths inside the pond during different periods of the day (morning and afternoon)...
March 23, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28332845/terrazoanthines-2-aminoimidazole-alkaloids-from-the-tropical-eastern-pacific-zoantharian-terrazoanthus-onoi
#16
Paul O Guillen, Karla B Jaramillo, Gregory Genta-Jouve, Frederic Sinniger, Jenny Rodriguez, Olivier P Thomas
The first chemical study of the common species Terrazoanthus onoi, present off the coast of Ecuador, led to the identification of a new family of 2-aminoimidazole alkaloids named terrazoanthines A-C (1-3). Homologues 1 and 2 feature an unprecedented 6-(imidazol-5-yl)benzo[d]imidazole. Acyl substitution pattern and complete configurational assignments were deduced from comparison between experimental and theoretical (13)C NMR and ECD data, respectively. These compounds may represent key derivatives in the biosynthesis of zoanthoxanthins...
March 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28332608/nutrient-cycling-mechanisms-other-than-the-direct-absorption-from-soil-may-control-forest-structure-and-dynamics-in-poor-amazonian-soils
#17
Oriol Grau, Josep Peñuelas, Bruno Ferry, Vincent Freycon, Lilian Blanc, Mathilde Desprez, Christopher Baraloto, Jérôme Chave, Laurent Descroix, Aurélie Dourdain, Stéphane Guitet, Ivan A Janssens, Jordi Sardans, Bruno Hérault
Tropical forests store large amounts of biomass despite they generally grow in nutrient-poor soils, suggesting that the role of soil characteristics in the structure and dynamics of tropical forests is complex. We used data for >34 000 trees from several permanent plots in French Guiana to investigate if soil characteristics could predict the structure (tree diameter, density and aboveground biomass), and dynamics (growth, mortality, aboveground wood productivity) of nutrient-poor tropical forests. Most variables did not covary with site-level changes in soil nutrient content, indicating that nutrient-cycling mechanisms other than the direct absorption from soil (e...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332127/a-review-of-zoonotic-infection-risks-associated-with-the-wild-meat-trade-in-malaysia
#18
REVIEW
Jennifer Caroline Cantlay, Daniel J Ingram, Anna L Meredith
The overhunting of wildlife for food and commercial gain presents a major threat to biodiversity in tropical forests and poses health risks to humans from contact with wild animals. Using a recent survey of wildlife offered at wild meat markets in Malaysia as a basis, we review the literature to determine the potential zoonotic infection risks from hunting, butchering and consuming the species offered. We also determine which taxa potentially host the highest number of pathogens and discuss the significant disease risks from traded wildlife, considering how cultural practices influence zoonotic transmission...
March 22, 2017: EcoHealth
https://www.readbyqxmd.com/read/28331606/responses-of-coral-reef-fishes-to-past-climate-changes-are-related-to-life-history-traits
#19
Eduardo Ottimofiore, Camille Albouy, Fabien Leprieur, Patrice Descombes, Michel Kulbicki, David Mouillot, Valeriano Parravicini, Loïc Pellissier
Coral reefs and their associated fauna are largely impacted by ongoing climate change. Unravelling species responses to past climatic variations might provide clues on the consequence of ongoing changes. Here, we tested the relationship between changes in sea surface temperature and sea levels during the Quaternary and present-day distributions of coral reef fish species. We investigated whether species-specific responses are associated with life-history traits. We collected a database of coral reef fish distribution together with life-history traits for the Indo-Pacific Ocean...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28331585/phylogenetics-and-biogeography-of-the-two-wing-flyingfish-exocoetidae-exocoetus
#20
Eric A Lewallen, Andrew J Bohonak, Carolina A Bonin, Andre J van Wijnen, Robert L Pitman, Nathan R Lovejoy
Two-wing flyingfish (Exocoetus spp.) are widely distributed, epipelagic, mid-trophic organisms that feed on zooplankton and are preyed upon by numerous predators (e.g., tunas, dolphinfish, tropical seabirds), yet an understanding of their speciation and systematics is lacking. As a model of epipelagic fish speciation and to investigate mechanisms that increase biodiversity, we studied the phylogeny and biogeography of Exocoetus, a highly abundant holoepipelagic fish taxon of the tropical open ocean. Morphological and molecular data were used to evaluate the phylogenetic relationships, species boundaries, and biogeographic patterns of the five putative Exocoetus species...
March 2017: Ecology and Evolution
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