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https://www.readbyqxmd.com/read/27793656/isolation-of-two-insecticidal-toxins-from-venom-of-the-australian-theraphosid-spider-coremiocnemis-tropix
#1
Maria P Ikonomopoulou, Jennifer J Smith, Volker Herzig, Sandy S Pineda, Sławomir Dziemborowicz, Sing-Yan Er, Thomas Durek, John Gilchrist, Paul F Alewood, Graham M Nicholson, Frank Bosmans, Glenn F King
Sheep flystrike is caused by parasitic flies laying eggs on soiled wool or open wounds, after which the hatched maggots feed on the sheep flesh and often cause large lesions. It is a significant economic problem for the livestock industry as infestations are difficult to control due to ongoing cycles of larval development into flies followed by further egg laying. We therefore screened venom fractions from the Australian theraphosid spider Coremiocnemis tropix to identify toxins active against the sheep blowfly Lucilia cuprina, which is the primary cause of flystrike in Australia...
October 25, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/27788884/analysis-of-10-environmental-allergen-components-of-the-american-cockroach-in-taiwan
#2
Mey-Fann Lee, Yi-Hsing Chen, Chu-Hui Chiang, Shyh-Jye Lin, Pei-Pong Song
BACKGROUND: Cockroaches are important sources of indoor airborne allergens. The American cockroach (Periplaneta americana) is the second leading inhalant allergen causing allergic airway diseases in Taiwan. We previously reported a difference in pathogenicity of different allergen components from American cockroaches. OBJECTIVE: To analyze the environmental profile of American cockroach allergen components. METHODS: Polyclonal antibodies were generated to recombinant American cockroach allergens, Per a 1 through Per a 10...
November 2016: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/27787207/first-record-of-hammerschmidtiella-diesingi-hammerschmidt-1838-oxyuridomorpha-thelastomatidae-parasite-of-periplaneta-americana-linnaeus-1758-blattodea-blattidae-in-japan-morphological-and-molecular-characterization
#3
Rina Sriwati, Sota Ozawa, Jans Morffe, Koichi Hasegawa
Nematodes, belonging to the family Thelastomatidae, are parasites of saprophytic terrestrial arthropods, mainly cockroaches. American cockroach Periplaneta americana (Linnaeus, 1758) has high environmental adaptability, and has been spread worldwide by human activity. There are several reports of thelastomatid parasitic nematodes of P americana in the world. Here, the thelastomatid nematode Hammerschmidtiella diesingi (Hammerschmidt, 1838) (Oxyuridomorpha: Thelastomatidae), isolated from P americana is recorded for the first time in Japan...
December 1, 2016: Acta Parasitologica
https://www.readbyqxmd.com/read/27754403/label-free-differential-proteomics-and-quantification-of-exoenzymes-from-isolates-of-the-entomopathogenic-fungus-beauveria-bassiana
#4
Giuseppe Dionisio, Per Kryger, Tove Steenberg
Beauveria bassiana is an entomopathogenic fungus that grows both in vivo and in vitro. In vivo it can colonize live insect hosts, and tissue digestion occurs by secreted hydrolytic exoenzymes. It can also colonize dead insect tissue provided this is free from competing microorganisms. Depending on whether the host is alive or dead the expression (quality/quantity) of the exoenzymes may vary. We have grown several isolates of B. bassiana in shaking flasks for 120 h at 25 °C in order to evaluate the maximal exoenzyme production using two diet regimes...
October 14, 2016: Insects
https://www.readbyqxmd.com/read/27639501/blaptica-dubia-as-sentinels-for-exposure-to-chemical-warfare-agents-a-pilot-study
#5
Franz Worek, Thomas Seeger, Katharina Neumaier, Timo Wille, Horst Thiermann
The increased interest of terrorist groups in toxic chemicals and chemical warfare agents presents a continuing threat to our societies. Early warning and detection is a key component for effective countermeasures against such deadly agents. Presently available and near term solutions have a number of major drawbacks, e.g. lack of automated, remote warning and detection of primarily low volatile chemical warfare agents. An alternative approach is the use of animals as sentinels for exposure to toxic chemicals...
September 14, 2016: Toxicology Letters
https://www.readbyqxmd.com/read/27590811/the-core-gut-microbiome-of-the-american-cockroach-periplaneta-americana-is-stable-and-resilient-to-dietary-shifts
#6
Kara A Tinker, Elizabeth A Ottesen
: The omnivorous cockroach Periplaneta americana hosts a diverse hindgut microbiota encompassing hundreds of microbial species. In this study, we used 16S rRNA gene sequencing to examine the effect of diet on the composition of the P. americana hindgut microbial community. Results show that the hindgut microbiota of P. americana exhibit a highly stable core microbial community with low variance in compositions between individuals and minimal community change in response to dietary shifts...
November 15, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27514662/antagonist-pharmacology-of-desensitizing-and-non-desensitizing-nicotinic-acetylcholine-receptors-in-cockroach-neurons
#7
Vincent L Salgado
Two α-bungarotoxin-sensitive nicotinic acetylcholine (ACh) receptor subtypes in neurons of the American cockroach have been identified as desensitizing (nAChD) and selectively inhibitable with 100nM imidacloprid, and non-desensitizing (nAChN) and selectively inhibitable with 100pM methyllycaconitine. In this paper, the single-electrode voltage-clamp technique was used to measure concentration-response relations for the action of ACh and five antagonists on pharmacologically separated nAChD and nAChN receptors of acutely dissociated neurons from thoracic ganglia of the American cockroach...
September 2016: Neurotoxicology
https://www.readbyqxmd.com/read/27511640/new-insights-into-the-infection-of-the-american-cockroach-periplaneta-americana-nymphs-with-metarhizium-anisopliae-s-l-ascomycota-hypocreales
#8
A C Gutierrez, J A R Machado, R Hubner-Campos, M A Pennisi, J Rodrigues, C C López Lástra, J J García, É K K Fernandes, C Luz
AIMS: To study the marked resistance of Periplaneta americana to entomopathogenic Metarhizium anisopliae. METHODS AND RESULTS: The low susceptibility of 4th instar nymphs applied topically with conidia seemed to be related to an active removal of conidia by the cockroach and to a disabled or retarded germination and subsequent development of conidia on the cuticle (up to 80% germination in the next 7 days after application). Inhibitions or delays of germination were related to the composition of the epicuticular fatty acids (30·1% w/w oleic, 28·3% w/w linoleic, 24·5% w/w palmitic and 11·7% w/w stearic acid) reported here...
August 11, 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27494326/dopamine-and-tyrosine-hydroxylase-immunoreactive-neurons-in-the-brain-of-the-american-cockroach-periplaneta-americana
#9
Yoshitaka Hamanaka, Run Minoura, Hiroshi Nishino, Toru Miura, Makoto Mizunami
The catecholamine dopamine plays several vital roles in the central nervous system of many species, but its neural mechanisms remain elusive. Detailed neuroanatomical characterization of dopamine neurons is a prerequisite for elucidating dopamine's actions in the brain. In the present study, we investigated the distribution of dopaminergic neurons in the brain of the American cockroach, Periplaneta americana, using two antisera: 1) an antiserum against dopamine, and 2) an antiserum against tyrosine hydroxylase (TH, an enzyme required for dopamine synthesis), and identified about 250 putatively dopaminergic neurons...
2016: PloS One
https://www.readbyqxmd.com/read/27486904/biomechanical-factors-in-the-adaptations-of-insect-tibia-cuticle
#10
Eoin Parle, Hannah Larmon, David Taylor
Insects are among the most diverse groups of animals on Earth. Their cuticle exoskeletons vary greatly in terms of size and shape, and are subjected to different applied forces during daily activities. We investigated the biomechanics of the tibiae of three different insect species: the desert locust (Schistocerca gregaria), American cockroach (Periplaneta americana) and Death's Head cockroach (Blaberus discoidalis). In a previous work, we showed that these tibiae vary not only in geometry (length, radius and thickness) but also in material quality (Young's modulus) and in the applied stress required to cause failure when loaded in bending...
2016: PloS One
https://www.readbyqxmd.com/read/27485682/path-to-health-asthma-study-a-survey-of-pediatric-asthma-in-an-urban-community
#11
Norma Alicea-Alvarez, Carlo Foppiano Palacios, Melanie Ortiz, Diana Huang, Kathleen Reeves
OBJECTIVE: Minority children with asthma who live in low-income urban communities bear a disproportionate burden of the disease. This study explores the perceived health care needs related to asthma care, identifies asthma triggers, potential barriers to care, and assesses the need for additional community resources. METHODS: We conducted a cross-sectional survey of Hispanic and African American adults (n = 53) who take care of a child with asthma and live in an urban community of North Philadelphia...
August 2, 2016: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/27383378/molecular-basis-of-the-remarkable-species-selectivity-of-an-insecticidal-sodium-channel-toxin-from-the-african-spider-augacephalus-ezendami
#12
Volker Herzig, Maria Ikonomopoulou, Jennifer J Smith, Sławomir Dziemborowicz, John Gilchrist, Lucia Kuhn-Nentwig, Fernanda Oliveira Rezende, Luciano Andrade Moreira, Graham M Nicholson, Frank Bosmans, Glenn F King
The inexorable decline in the armament of registered chemical insecticides has stimulated research into environmentally-friendly alternatives. Insecticidal spider-venom peptides are promising candidates for bioinsecticide development but it is challenging to find peptides that are specific for targeted pests. In the present study, we isolated an insecticidal peptide (Ae1a) from venom of the African spider Augacephalus ezendami (family Theraphosidae). Injection of Ae1a into sheep blowflies (Lucilia cuprina) induced rapid but reversible paralysis...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27362401/comparison-between-specific-ige-levels-and-skin-prick-test-results-of-local-and-imported-american-cockroach-dog-cat-dust-mites-and-mold-allergen-extracts
#13
Nualanong Visitsunthorn, Chaweewan Sripramong, Chaweewan Bunnag, Orathai Jirapongsananuruk
BACKGROUND: Skin prick test (SPT) and specific IgE (sIgE) are approved for evaluation of allergen sensitization. Local allergen extracts are less expensive and more available but need to be standardized. OBJECTIVE: To compare SPT results of local and imported allergen extracts and sIgE levels in response to the American cockroach, dog, cat, Dermatophagoides pteronyssinus (Dp), Dermatophagoides farinae (Df) and Cladosporium spp. allergens. METHOD: This prospective, randomized, double-blind, self-controlled study was performed in respiratory allergic volunteers...
June 30, 2016: Asian Pacific Journal of Allergy and Immunology
https://www.readbyqxmd.com/read/27238578/sensitization-to-mouse-and-cockroach-allergens-and-asthma-morbidity-in-urban-minority-youth-genes-environments-and-admixture-in-latino-american-gala-ii-and-study-of-african-americans-asthma-genes-and-environments-sage-ii
#14
Anna B Fishbein, Todd A Lee, Miao Cai, Sam S Oh, Celeste Eng, Donglei Hu, Scott Huntsman, Harold J Farber, Denise Serebrisky, Jonathan Silverberg, L Keoki Williams, Max A Seibold, Saunak Sen, Luisa N Borrell, Pedro Avila, William Rodriguez-Cintron, Jose R Rodriguez-Santana, Esteban G Burchard, Rajesh Kumar
BACKGROUND: Pest allergen sensitization is associated with asthma morbidity in urban youth but minimally explored in Latino populations. Specifically, the effect of mouse sensitization on the risk of asthma exacerbation has been unexplored in Latino subgroups. OBJECTIVE: To evaluate whether pest allergen sensitization is a predictor of asthma exacerbations and poor asthma control in urban minority children with asthma. METHODS: Latino and African American children (8-21 years old) with asthma were recruited from 4 sites across the United States...
July 2016: Annals of Allergy, Asthma & Immunology
https://www.readbyqxmd.com/read/27231663/symbiotic-essential-amino-acids-provisioning-in-the-american-cockroach-periplaneta-americana-linnaeus-under-various-dietary-conditions
#15
Paul A Ayayee, Thomas Larsen, Zakee Sabree
Insect gut microbes have been shown to provide nutrients such as essential amino acids (EAAs) to their hosts. How this symbiotic nutrient provisioning tracks with the host's demand is not well understood. In this study, we investigated microbial essential amino acid (EAA) provisioning in omnivorous American cockroaches (Periplaneta americana), fed low-quality (LQD) and comparatively higher-quality dog food (DF) diets using carbon stable isotope ratios of EAAs (δ (13)CEAA). We assessed non-dietary EAA input, quantified as isotopic offsets (Δ(13)C) between cockroach (δ (13)CCockroach EAA) and dietary (δ (13)CDietary EAA) EAAs, and subsequently determined biosynthetic origins of non-dietary EAAs in cockroaches using (13)C-fingerprinting with dietary and representative bacterial and fungal δ (13)CEAA...
2016: PeerJ
https://www.readbyqxmd.com/read/27167617/de-novo-transcriptome-analysis-and-detection-of-antimicrobial-peptides-of-the-american-cockroach-periplaneta-americana-linnaeus
#16
In-Woo Kim, Joon Ha Lee, Sathiyamoorthy Subramaniyam, Eun-Young Yun, Iksoo Kim, Junhyung Park, Jae Sam Hwang
Cockroaches are surrogate hosts for microbes that cause many human diseases. In spite of their generally destructive nature, cockroaches have recently been found to harbor potentially beneficial and medically useful substances such as drugs and allergens. However, genomic information for the American cockroach (Periplaneta americana) is currently unavailable; therefore, transcriptome and gene expression profiling is needed as an important resource to better understand the fundamental biological mechanisms of this species, which would be particularly useful for the selection of novel antimicrobial peptides...
2016: PloS One
https://www.readbyqxmd.com/read/27158782/the-contribution-of-the-melanin-pathway-to-overall-body-pigmentation-during-ontogenesis-of-periplaneta-americana
#17
LETTER
Thomas R Lemonds, Jin Liu, Aleksandar Popadić
The most prominent colors observed in insects are black or brown, whose production is attributed to the melanin pathway. At present, though, the contribution of this pathway to overall body pigmentation throughout ontogenesis is still lacking. To address this question we examined the roles of 2 key melanin genes (TH and DDC), in embryonic and postembryonic development of the American cockroach, Periplaneta americana. Our results show that the melanin pathway does not contribute to the light brown coloration observed in the first nymphs...
August 2016: Insect Science
https://www.readbyqxmd.com/read/27078647/morphological-molecular-and-developmental-characterization-of-the-thelastomatid-nematode-thelastoma-bulhoesi-de-magalh%C3%A3-es-1900-oxyuridomorpha-thelastomatidae-parasite-of-periplaneta-americana-linnaeus-1758-blattodea-blattidae-in-japan
#18
Sota Ozawa, Jans Morffe, Cláudia S L Vicente, Kenji Ikeda, Ryoji Shinya, Koichi Hasegawa
The American cockroach Periplaneta americana (Linnaeus, 1758) (Blattodea: Blattidae) has been spreading worldwide by commerce and has successfully adjusted to living with humans. There are many reports of thelastomatid parasitic nematode isolated from P. americana in many countries including USA, Canada, India, Argentina, Bulgaria, but not in Japan. We have investigated the parasitic nematodes in P. americana lab strain and field-captured individuals in Japan and found that Thelastoma bulhoesi (de Magalhães, 1900) (Oxyuridomorpha: Thelastomatidae) parasitizes with high infection rates...
March 2016: Acta Parasitologica
https://www.readbyqxmd.com/read/27074720/identification-and-bioactivity-evaluation-of-the-first-neuropeptide-from-the-lesser-known-insect-order-embioptera-webspinner
#19
Gerd Gäde, Petr Šimek, Heather G Marco
A species of the poorly studied order Embioptera, the webspinner Oligotoma saundersii, is investigated for its complement of neuropeptides of the adipokinetic hormone (AKH) family. A methanolic extract of its corpora cardiaca (CC) is able to effect carbohydrate mobilization in the cockroach, Periplaneta americana, and liquid chromatography coupled to electrospray ionization mass spectrometry clearly identified one decapeptide as a member of the AKH family in the CC of O. saundersii. The primary structure of this peptide, code-named Olisa-AKH, is elucidated as pEVNFSPNWGG amide...
July 2016: Amino Acids
https://www.readbyqxmd.com/read/27047261/investigation-of-bacteriological-infections-of-the-american-cockroaches-in-paveh-city-kermanshah-province
#20
Sirvan Sayyad, Ahmad Vahabi, Boshra Vahabi, Mahnaz Sayyadi, Shahnaz Haji Sahne
INTRODUCTION: American cockroaches, Periplaneta americana, are the most important pests in hospitals and dwelling environments. They are mechanical vectors of some bacterial pathogens. GOAL: The present investigation was carried out in Ghods hospital and 5 dwelling localities of Paveh city to evaluate bacterial infestations of American cockroaches in this region of Iran. METHODS: The samples were randomly collected from hospital environments and toilets and kitchens of the dwelling localities from December-March 2012 and July-September 2013...
February 2016: Materia Socio-medica
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