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https://www.readbyqxmd.com/read/28922900/grass-pollen-affects-survival-and-development-of-larval-anopheles-arabiensis-diptera-culicidae
#1
Yelfwagash Asmare, Richard J Hopkins, Habte Tekie, Sharon R Hill, Rickard Ignell
Nutrients in breeding sites are critical for the survival and development of malaria mosquitoes, having a direct impact on vectorial capacity. Yet, there is a limited understanding about the natural larval diet and its impact on the individual fitness of mosquitoes. Recent studies have shown that gravid Anopheles arabiensis Patton (Diptera: Culicidae) are attracted by and oviposit in grass-associated habitats. The pollen provided by these grasses is a potential source of nutrients for the larvae. Here, we assess the effect of Typha latifolia L...
September 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28921776/transcriptional-responses-to-short-term-and-long-term-host-plant-experience-and-parasite-load-in-an-oligophagous-beetle
#2
Caroline Müller, Heiko Vogel, David G Heckel
Oligophagous herbivores must adjust their enzymatic machinery to the different host plant species they consume. If different hosts are used from one generation to the next, adaptation may be highly plastic, while if a single host is used over several generations there may be a longer-term response due to natural selection. Using an experimental evolutionary approach, we investigated effects of long-term experience versus short-term responses to different host plants in the oligophagous mustard leaf beetle Phaedon cochleariae...
September 16, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28920804/trichinella-infections-in-red-foxes-vulpes-vulpes-and-golden-jackals-canis-aureus-in-six-districts-of-serbia
#3
Marko Dmitric, Dejan Vidanovic, Nikola Vaskovic, Kazimir Matovic, Milanko Sekler, Zoran Debeljak, Nedjeljko Karabasil
Wild animals, including red foxes (Vulpes vulpes) and golden jackals (Canis aureus), are the most important reservoirs of Trichinella spp. Although the red fox is considered one of the main reservoirs of Trichinella spp. in Europe, only a few animals have been examined in Serbia. The present study assessed Trichinella spp. infection in red foxes and golden jackals from the six districts in Serbia. Thirty-seven carcasses of red foxes and 13 carcasses of golden jackals shot during the official hunting season were examined...
September 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28920565/regulatory-functions-of-trehalose-6-phosphate-synthase-in-the-chitin-biosynthesis-pathway-in-tribolium-castaneum-coleoptera-tenebrionidae-revealed-by-rna-interference
#4
Q W Chen, S Jin, L Zhang, Q D Shen, P Wei, Z M Wei, S G Wang, B Tang
RNA interference (RNAi) is a very effective technique for studying gene function and may be an efficient method for controlling pests. Trehalose-6-phosphate synthase (TPS), which plays a key role in the synthesis of trehalose and insect development, was cloned in Tribolium castaneum (Herbst) (TcTPS) and the putative functions were studied using RNAi via the injection of double-stranded RNA (dsRNA) corresponding to conserved TPS and trehalose-6-phosphate phosphatase domains. Expression analyses show that TcTPS is expressed higher in the fat body, while quantitative real-time polymerase chain reaction results show that the expression of four trehalase isoforms was significantly suppressed by dsTPS injection...
September 18, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28919948/cytogenetic-data-on-the-agro-predatory-ant-megalomyrmex-incisus-smith-1947-and-its-host-mycetophylax-conformis-mayr-1884-hymenoptera-formicidae
#5
Danon Clemes Cardoso, Tássia Tatiane Pontes Pereira, Alessandro Lick Cordeiro, Maykon Passos Cristiano
We provide the first karyotype description of the agro-predatory ant species Megalomyrmex incisus Smith, 1947 (Myrmicinae, Formicidae), and chromosome counts of its host Mycetophylax conformis (Mayr, 1884) (Myrmicinae, Formicidae) from geographically distinct populations. Colonies of both species were sampled from coastal areas of Ilhéus, Bahia, Brazil, and transferred to the laboratory. Metaphase spreads were prepared from the cerebral ganglia of defecated larvae. The slides were examined and pictures of the best metaphases were taken...
2017: Comparative Cytogenetics
https://www.readbyqxmd.com/read/28919888/the-sporothrix-schenckii-gene-encoding-for-the-ribosomal-protein-l6-has-constitutive-and-stable-expression-and-works-as-an-endogenous-control-in-gene-expression-analysis
#6
Elías Trujillo-Esquivel, José A Martínez-Álvarez, Diana M Clavijo-Giraldo, Nahúm V Hernández, Alberto Flores-Martínez, Patricia Ponce-Noyola, Héctor M Mora-Montes
Sporothrix schenckii is one of the causative agents of sporotrichosis, a worldwide-distributed mycosis that affects humans and other mammals. The interest in basic and clinical features of this organism has significantly increased in the last years, yet little progress in molecular aspects has been reported. Gene expression analysis is a set of powerful tools that helps to assess the cell response to changes in the extracellular environment, the genetic networks controlling metabolic pathways, and the adaptation to different growth conditions...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28919886/dna-adenine-methyltransferase-dam-overexpression-impairs-photorhabdus-luminescens-motility-and-virulence
#7
Amaury Payelleville, Anne Lanois, Marie Gislard, Emeric Dubois, David Roche, Stéphane Cruveiller, Alain Givaudan, Julien Brillard
Dam, the most described bacterial DNA-methyltransferase, is widespread in gamma-proteobacteria. Dam DNA methylation can play a role in various genes expression and is involved in pathogenicity of several bacterial species. The purpose of this study was to determine the role played by the dam ortholog identified in the entomopathogenic bacterium Photorhabdus luminescens. Complementation assays of an Escherichia coli dam mutant showed the restoration of the DNA methylation state of the parental strain. Overexpression of dam in P...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28919444/a-new-black-fly-species-of-the-simulium-gomphostilbia-epistum-species-group-diptera-simuliidae-from-thailand
#8
Hiroyuki Takaoka, Wichai Srisuka, Van Lun Low, Atiporn Saeung
A new species of black fly, Simulium (Gomphostilbia) isanense, is described based on females, males, pupae and mature larvae from Thailand. This new species is placed in the Simulium epistum species-group of the subgenus Gomphostilbia Enderlein. It is characterized by the pupal gill with eight filaments arranged as 3+3+2 from dorsal to ventral, of which an inner filament of the ventral pair is slightly longer than its counter filament. Taxonomic notes are provided to distinguish this new species from S. (G...
September 15, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28919405/exploration-of-stable-isotope-analysis-for-tick-host-identification
#9
Kathleen LoGiudice, Kathryn Kurchena, Katherine Christopher, Natasha Scott
Due to the problem of tick-borne diseases, there is a need to better understand the importance of different host species in maintaining enzootic disease cycles. We explored the utility of stable isotope analysis to identify the larval hosts of questing ixodid ticks. In laboratory experiments, we used Ixodes scapularis and two host species that are important in the Lyme disease system in eastern North America. First, we tested how effectively a short-term dietary tracer ((13)C in corn) was reflected in molted ticks...
September 7, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28919016/metarhizium-brunneum-an-enzootic-wireworm-disease-and-evidence-for-its-suppression-by-bacterial-symbionts
#10
Todd Kabaluk, Erica Li-Leger, Sean Nam
Wireworms (Coleoptera: Elateridae) are serious agricultural pests, with soil-dwelling larvae attacking subterranean tissues of crop plants and their fruit when in contact with the soil surface. Researchers collect wireworms for laboratory experiments to study their behaviour and test pest control agents but frequently lose them to Metarhizium Petch (Ascomycota: Hypocreales: Clavicipitaceae) infection. We found latent M. brunneum infection in 13-100% of live, asymptomatic Agriotes obscurus and A. lineatus wireworms acquired from agricultural fields and in wireworms maintained indoors, indicating its enzootic presence...
September 14, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28919015/activity-of-bacillus-thuringiensis-cry1ie2-cry2ac7-vip3aa11-and-cry7ab3-proteins-against-anticarsia-gemmatalis-chrysodeixis-includens-and-ceratoma-trifurcata
#11
Rubina Mushtaq, Robert Behle, Rongmei Liu, Lin Niu, Ping Song, Abdul Rauf Shakoori, Juan Luis Jurat-Fuentes
Transgenic soybean producing the Cry1Ac insecticidal protein from the bacterium Bacillus thuringiensis is used to control larvae of the velvetbean caterpillar (Anticarsia gemmatalis Hübner) and the soybean looper [Chrysodeixis includens (Walker)]. The main threat to the sustainability of this technology is the development of resistance, which could be delayed by using pyramiding of diverse Bt insecticidal genes. We report high activity of Cry2Ac7 and Vip3Aa11 but not Cry1Ie2 against larvae of A. gemmatalis and C...
September 14, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28918946/cooperative-behavior-emerges-among-drosophila-larvae
#12
Mark Dombrovski, Leanne Poussard, Kamilia Moalem, Lucia Kmecova, Nic Hogan, Elisabeth Schott, Andrea Vaccari, Scott Acton, Barry Condron
Spectacular examples of cooperative behavior emerge among a variety of animals and may serve critical roles in fitness [1, 2]. However, the rules governing such behavior have been difficult to elucidate [2]. Drosophila larvae are known to socially aggregate [3, 4] and use vision, mechanosensation, and gustation to recognize each other [5-8]. We describe here a model experimental system of cooperative behavior involving Drosophila larvae. While foraging in liquid food, larvae are observed to align themselves and coordinate their movements in order to drag a common air cavity and dig deeper...
September 6, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28917671/scanning-electron-microscopy-and-histopathological-observations-of-beauveria-bassiana-infection-of-colorado-potato-beetle-larvae
#13
Yulin Duan, Hui Wu, Zhiyan Ma, Liu Yang, Deying Ma
Beauveria bassiana is a potential candidate for use as an environmentally friendly bio-pesticide. We studied the infection process and histopathology of B. bassiana strain NDBJJ-BFG infection of the Colorado potato beetle (Leptinotarsa decemlineata) using scanning electron microscopy and hematoxylin-eosin staining of tissue sections. The results show that the fungus penetrated the insect epidermis through germ tubes and appressoria after spraying the larvae with conidial suspensions. The conidia began to germinate after 24 h and invade the epidermis...
September 13, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28917651/bacteriophages-as-an-alternative-to-conventional-antibiotic-use-for-the-prevention-or-treatment-of-paenibacillus-larvae-in-honeybee-hives
#14
T Scott Brady, Bryan D Merrill, Jared A Hilton, Ashley M Payne, Michael B Stephenson, Sandra Hope
American Foulbrood (AFB) is an infectious disease caused by the bacteria, Paenibacillus larvae. P. larvae phages were isolated and tested to determine each phages' host range amongst 59 field isolate strains of P. larvae. Three phages were selected to create a phage cocktail for the treatment of AFB infections according to the combined phages' ability to lyse all tested strains of bacteria. Studies were performed to demonstrate the safety and efficacy of the phage cocktail treatment as a replacement for traditional antibiotics for the prevention of AFB and the treatment of active infections...
September 13, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28917312/first-finding-of-nymphal-stages-of-linguatula-serrata-in-a-south-american-camelid-a-vicu%C3%A3-a-from-peru
#15
Luis A Gomez-Puerta, Joel I Pacheco, José M Angulo-Tisoc, Maria T Lopez-Urbina, Armando E Gonzalez
Linguatula serrata, a pentastomid, was found parasitizing the lungs of a vicuña (Vicugna vicugna) from Cuzco, Peru. A total of 13 larvae were found encysted in the parenchymal tissue of the lungs. All larvae were identified as nymphal stages of L. serrata by morphological methods Diagnosis was confirmed by molecular analysis amplifying the cytochrome c oxidase 1 gene of three nymphs. Nucleotide sequences from the isolates were compared to previous sequences from GenBank, and it showed high similarity between them (>99%)...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28917310/screening-of-a-small-well-curated-natural-product-based-library-identifies-two-rotenoids-with-potent-nematocidal-activity-against-haemonchus-contortus
#16
H M P Dilrukshi Herath, Sarah Preston, Andreas Hofmann, Rohan A Davis, Anson V Koehler, Bill C H Chang, Abdul Jabbar, Robin B Gasser
The control of parasitic roundworms (nematodes) is heavily reliant on the use of a limited number of anthelmintic drugs. However, drug resistance is now very widespread and no vaccines are available, such that the discovery of new chemical entities is crucial. Within this context, we screened a library of pure natural products (n=400) against exsheathed third-stage (xL3) larvae of the parasitic nematode Haemonchus contortus using a whole-organism screening method. We identified two plant-derived rotenoids, deguelin and rotenone, with inhibitory activity on xL3 motility...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28917298/high-prevalence-of-bovine-cysticercosis-found-during-evaluation-of-different-post-mortem-detection-techniques-in-belgian-slaughterhouses
#17
Famke Jansen, Pierre Dorny, Dirk Berkvens, Anke Van Hul, Nick Van den Broeck, Caroline Makay, Nicolas Praet, Ramon Marc Eichenberger, Peter Deplazes, Sarah Gabriël
Bovine cysticercosis (BCC), caused by the helminth Taenia saginata, is currently diagnosed solely by official meat inspection (MI) based on macroscopic detection of viable cysticerci or typical lesions of degenerated larvae. MI has a known low sensitivity (<16%), leading to a large proportion of infected cattle carcasses entering the human food chain and posing a risk to public health. Prevalence in Belgium based on MI results is estimated at around 0.22%. Due to the low sensitivity of MI, alternative techniques to detect BCC should be considered...
September 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28916708/architectural-delineation-and-molecular-identification-of-extracellular-matrix-in-ascidian-embryos-and-larvae
#18
Jiankai Wei, Guilin Wang, Xiang Li, Ping Ren, Haiyan Yu, Bo Dong
The extracellular matrix (ECM) not only provides essential physical scaffolding for cellular constituents but also initiates crucial biochemical and biomechanical cues that are required for tissue morphogenesis. In this study, we utilized wheat germ agglutinin (WGA) staining to characterize the ECM architecture in ascidian embryos and larvae. The results showed three distinct populations of ECM presenting in Ciona embryogenesis: the outer layer localized at the surface of embryo, an inner layer of notochord sheath and the apical ECM secreted by the notochord...
September 15, 2017: Biology Open
https://www.readbyqxmd.com/read/28916146/chinese-sacbrood-virus-infection-in-asian-honey-bees-apis-cerana-cerana-and-host-immune-responses-to-the-virus-infection
#19
Liu Shan, Wang Liuhao, Guo Jun, Tang Yujie, Chen Yanping, Wu Jie, Li Jilian
Chinese Sacbrood virus (CSBV) is a positive-stranded RNAvirus that infects both the European honey bee (Apis mellifera) and the Asian honey bee (A. cerana). However, CSBV has much more devastating effects on Asian honey bees than on European honey bees, posing a serious threat to the agricultural and natural ecosystems that rely on A. cerana for pollination service. Using quantitative RT-PCR method, we conducted studies to examine the CSBV infection in Asian honey bee colonies and immune responses of individual bees in response to CSBV infection...
September 12, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28914443/indirect-effects-of-larvae-dispersal-following-mass-mortality-events
#20
Marcus A Lashley, Heather R Jordan, Jeffery K Tomberlin, Brandon T Barton
Mass mortality events are characterized by rapid die-offs of many individuals within a population at a specific location. These events produce a high concentration of remains within a given locale and the frequency and magnitude of these events may be increasing (Fey et al. 2015). Mass mortality events may be caused by physical (e.g., lightning strikes, fire), chemical (e.g., pollutants, hypoxia), or biological processes (e.g., disease, phenological mismatch with food source). This article is protected by copyright...
September 15, 2017: Ecology
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