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https://www.readbyqxmd.com/read/28431082/compositional-differences-among-female-associated-and-embryo-associated-microbiota-of-the-viviparous-pacific-beetle-cockroach-diploptera-punctata
#1
Paul A Ayayee, George Keeney, Zakee L Sabree, Agustí Muñoz-Garcia
All cockroach species, except one, harbor the endosymbiont Blattabacterium, transmitted from females to embryos. Adult cockroaches acquire non-Blattabacterium bacteria as part of their gut microbiota over time, but our knowledge of the possible transmission of these non-Blattabacterium bacteria from females to embryos is rudimentary. We characterized the gut microbiota of gravid viviparous Diploptera punctata females and the non-Blattabacterium microbiota of associated developing embryos, as well as the gut microbiota of non-gravid females, and the microbiota of orphan embryos (females not included), following high-throughput sequencing of the 16S rRNA gene to assess bacterial transference...
April 18, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28429621/the-distribution-and-movement-of-american-cockroaches-in-urban-niches-of-new-orleans
#2
John C Carlson, Felicia A Rabito, Derek Werthmann, Mark Fox
American cockroaches are an important source of household allergens in tropical and semitropical climates. To determine which outdoor niches produce American cockroaches, traps were placed at 40 homes in New Orleans to collect nymphs. Nymphs were collected from the sewers, yards, and within the homes themselves. To compare sewers and yards as sources of cockroaches entering homes, adult cockroaches were collected, marked, and released into yards and sewers. No sewer-released cockroaches were collected in homes...
April 1, 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28426402/molecular-identification-of-thelandros-scleratus-and-thelastoma-icemi-nematoda-oxyruida-using-mitochondrial-cox-1-sequences
#3
Anshu Chaudhary, Garima Kansal, Neetu Singh, Kumari Shobhna, Manu Verma, Hridaya S Singh
Two species of parasitic nematodes collected from the intestine of Brook's House Gecko, Hemidactylus brooki and American cockroach, Periplaneta americana L. The parasites were identified as Thelandros scleratus and Thelastoma icemi by PCR amplification method. Subsequently, sequence analysis of mt cox1 (504 and 540 bp) for T. scleratus and T. icemi respectively revealed that these sequences showed maximum similarity of 90% (in case of T. scleratus), 77% (in case of T. icemi), to nematode sequences available on GenBank...
June 1, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/28421512/new-insights-into-cockroach-allergens
#4
REVIEW
Anna Pomés, Geoffrey A Mueller, Thomas A Randall, Martin D Chapman, L Karla Arruda
PURPOSE OF REVIEW: This review addresses the most recent developments on cockroach allergen research in relation to allergic diseases, especially asthma. RECENT FINDINGS: The number of allergens relevant to cockroach allergy has recently expanded considerably up to 12 groups. New X-ray crystal structures of allergens from groups 1, 2, and 5 revealed interesting features with implications for allergen standardization, sensitization, diagnosis, and therapy. Cockroach allergy is strongly associated with asthma particularly among children and young adults living in inner-city environments, posing challenges for disease control...
April 2017: Current Allergy and Asthma Reports
https://www.readbyqxmd.com/read/28406167/persistence-of-a-sugar-rejecting-cockroach-genotype-under-various-dietary-regimes
#5
Kim Jensen, Ayako Wada-Katsumata, Coby Schal, Jules Silverman
Glucose-aversion is a heritable trait that evolved in a number of German cockroach (Blattella germanica L.) populations in response to strong selection with glucose-containing insecticide baits. However, in the absence of glucose-containing bait, glucose-averse (GA) cockroaches have lower performance than wild-type (WT) cockroaches in several fitness-determining traits. We allocated 48 caged populations initiated with homozygous GA and WT adults to four dietary treatments consisting of either pure rodent chow, rodent chow mixed to yield a content of either 20% glucose or 20% fructose, or a treatment consisting of choice between the 20% glucose- and the 20% fructose-containing food...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28404730/not-flying-blind-a-comparative-study-of-photoreceptor-function-in-flying-and-non-flying-cockroaches
#6
Roman V Frolov, Atsuko Matsushita, Kentaro Arikawa
Flying is often associated with superior visual performance since good vision is crucial for detection and implementation of rapid visually-guided aerial movements. To understand the evolution of insect visual systems it is therefore important to compare phylogenetically related species with different investments into flight capability. Here, we describe and compare morphological and electrophysiological properties of photoreceptors from the habitually flying green cockroach Panchlora nivea, and the American cockroach Periplaneta americana, which flies only at high ambient temperatures...
April 12, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28401926/association-between-cockroach-specific-immunoglobulin-e-and-periodontitis-in-korean-male-adults-based-on-korean-national-health-and-nutrition-examination-survey
#7
Mihee Hong, Jun-Beom Park, Young Soo Kim, Dong-Hee Lee, HeeYeon Kim, Jae-Im Lee, Hyo-Suk Ahn, Tae Seo Sohn, Tae-Kyu Lee, Jae Yen Song, Seong Cheol Jeong, Chang Dong Yeo, Hiun Suk Chae, Kyung Do Han, David Vu, Young Bok Lee
Periodontitis is an inflammatory disease affecting the tooth supporting tissues (periodontium) and associated with chronic diseases such as cardiovascular disease and insulin resistance. However, there has been no nation-wide population based epidemiologic study regarding any association between periodontitis and serum IgE. Among the 8,958 participants in the 2010 Korean National Health and Nutrition Examination Survey (KNHANES V-1), 1,731 adults aged 19 to 64 who had measured serum IgE were included in the analysis...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28396143/lethal-effects-of-an-insecticidal-spider-venom-peptide-involve-positive-allosteric-modulation-of-insect-nicotinic-acetylcholine-receptors
#8
Monique J Windley, Irina Vetter, Richard J Lewis, Graham M Nicholson
κ-Hexatoxins (κ-HXTXs) are a family of excitotoxic insect-selective neurotoxins from Australian funnel-web spiders that are lethal to a wide range of insects, but display no toxicity towards vertebrates. The prototypic κ-HXTX-Hv1c selectively blocks native and expressed cockroach large-conductance calcium-activated potassium (BKCa or KCa1.1) channels, but not their mammalian orthologs. Despite this potent and selective action on insect KCa1.1 channels, we found that the classical KCa1.1 blockers paxilline, charybdotoxin and iberiotoxin, which all block insect KCa1...
April 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28374493/expression-of-juvenile-hormone-acid-o-methyltransferase-and-juvenile-hormone-synthesis-in-blattella-germanica
#9
Claudia V Dominguez, Jose L Maestro
Juvenile hormone (JH), a sesquiterpenoid synthetized by the insect corpora allata (CA), plays critical roles in metamorphosis and reproduction. Penultimate or last step of JH synthesis is catalyzed by juvenile hormone acid O-methyltransferase (JHAMT). Here we report the cloning and expression analysis of the JHAMT orthologue in the cockroach, Blattella germanica (L.) (BgJHAMT). BgJHAMT is mainly expressed in CA, with only expression traces in ovary. Three different isoforms, differing in the 3'-UTR sequence, were identified...
April 4, 2017: Insect Science
https://www.readbyqxmd.com/read/28362801/exposure-to-secondhand-smoke-and-asthma-severity-among-children-in-connecticut
#10
Jessica P Hollenbach, Elizabeth D Schifano, Christopher Hammel, Michelle M Cloutier
OBJECTIVE: To determine whether secondhand smoke (SHS) exposure is associated with greater asthma severity in children with physician-diagnosed asthma living in CT, and to examine whether area of residence, race/ethnicity or poverty moderate the association. METHODS: A large childhood asthma database in CT (Easy Breathing) was linked by participant zip code to census data to classify participants by area of residence. Multinomial logistic regression models, adjusted for enrollment date, sex, age, race/ethnicity, area of residence, insurance type, family history of asthma, eczema, and exposure to dogs, cats, gas stove, rodents and cockroaches were used to examine the association between self-reported exposure to SHS and clinician-determined asthma severity (mild, moderate, and severe persistent vs...
2017: PloS One
https://www.readbyqxmd.com/read/28362014/azobenzene-benzoylphenylureas-as-photoswitchable-chitin-synthesis-inhibitors
#11
Xue Tian, Chao Zhang, Qi Xu, Zhong Li, Xusheng Shao
Benzoylphenylureas (BPUs) are used as synthetic insect growth regulators for inhibiting chitin synthesis. Merging insecticidal BPUs with photoswitchable azobenzene generated photoresponsive chitin synthesis inhibitors. A prepared azobenzene-benzoylphenylurea can be activated upon irradiation with UV light, and shows 6-fold and 2-fold activity difference to armyworm (Mythimna separata) and German cockroach (Blattella germanica) sulfonylurea receptors, respectively. This is the first example of a photoswitchable BPU insecticide...
April 11, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28351766/common-cold-among-pre-school-children-in-china-associations-with-ambient-pm10-and-dampness-mould-cats-dogs-rats-and-cockroaches-in-the-home-environment
#12
Dan Norbäck, Chan Lu, Yinping Zhang, Baizhan Li, Zhuohui Zhao, Chen Huang, Xin Zhang, Hua Qian, Jan Sundell, Qihong Deng
BACKGROUND: There is some evidence that dampness, mould and cockroaches can increase the risk of respiratory infections in children but few studies exist from China on this topic. Aim To study associations between domestic early life exposure to biological indoor factors (dampness, mould, cats, dogs, rats, cockroaches), cleaning habits and common cold among pre-school children across China. METHODS: Children aged 3-6years (n=39,782) were recruited from randomly selected day care centres in seven cities in China...
March 25, 2017: Environment International
https://www.readbyqxmd.com/read/28348934/genetic-insights-into-family-group-co-occurrence-in-cryptocercus-punctulatus-a-sub-social-woodroach-from-the-southern-appalachian-mountains
#13
Ryan C Garrick
The wood-feeding cockroach Cryptocercus punctulatus Scudder (Blattodea: Cryptocercidae) is an important member of the dead wood (saproxylic) community in montane forests of the southeastern United States. However, its population biology remains poorly understood. Here, aspects of family group co-occurrence were characterized to provide basic information that can be extended by studies on the evolution and maintenance of sub-sociality. Broad sampling across the species' range was coupled with molecular data (mitochondrial DNA (mtDNA) sequences)...
2017: PeerJ
https://www.readbyqxmd.com/read/28334348/evaluation-of-the-potential-for-secondary-kill-for-ingested-insecticides-in-the-common-bed-bug-hemiptera-cimicidae
#14
Yvonne K Matos, Angela Sierras, Coby Schal
Baits are a preferred method of urban pest management. Baits enable more targeted insecticide applications with a fraction of the active ingredient used in residual sprays. Bait translocation by foragers, and consequent secondary kill of nonforagers, enhances bait effectiveness in social insects, and in other group-living species like German cockroaches (Blattella germanica L.). We investigated the potential for secondary kill in bed bugs (Cimex lectularius L.), another gregarious species, using a liquid bait...
March 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334316/insecticide-resistance-of-several-field-collected-german-cockroach-dictyoptera-blattellidae-strains
#15
Xiaoyan Wu, Arthur G Appel
German cockroaches, Blattella germanica (L.), remain one of the most difficult indoor insect species to control because of its ability to develop resistance to insecticides. The toxicity and resistance levels of five technical-grade insecticides (permethrin, chlorpyrifos, propoxur, imidacloprid, and fipronil) were determined for adult males of seven strains of the German cockroach, a laboratory-reared susceptible strain (S) and six field-collected strains (B, D, E, G, H, and I). Using topical application methods, fipronil was the most toxic insecticide to all seven strains...
March 8, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334270/development-of-diagnostic-insecticide-concentrations-and-assessment-of-insecticide-susceptibility-in-german-cockroach-dictyoptera-blattellidae-field-strains-collected-from-public-housing
#16
Mahsa Fardisi, Ameya D Gondhalekar, Michael E Scharf
Insecticide resistance in German cockroaches (Blattella germanica (L.)) has been a barrier to effective control since its first documentation in the 1950s. A necessary first step toward managing resistance is to understand insecticide susceptibility profiles in field-collected strains so that active ingredients (AIs) with lowest resistance levels can be identified. As a first step in this study, diagnostic concentrations (DCs) were determined for 14 insecticide AIs based on lethal concentrations that killed 99% or 90% of the individuals from a susceptible lab strain (JWax-S)...
March 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334192/insecticidal-properties-of-essential-oils-and-some-of-their-constituents-on-the-turkestan-cockroach-blattodea-blattidae
#17
Sudip Gaire, Mary O'Connell, Francisco O Holguin, Anup Amatya, Scott Bundy, Alvaro Romero
The Turkestan cockroach, Blatta lateralis (Walker), has become the most important peridomestic species in urban areas of the Southwestern United States. The aim of this study was to evaluate the use of botanical compounds to control this urban pest. We tested the acute toxicity and repellency of six botanical constituents and three essential oils on Turkestan cockroach nymphs. Chemical composition of the essential oils was also determined. Topical and fumigant assays with nymphs showed that thymol was the most toxic essential oil constituent, with a LD50 of 0...
April 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28331632/group-housed-females-promote-production-of-asexual-ootheca-in-american-cockroaches
#18
Ko Katoh, Masazumi Iwasaki, Shouhei Hosono, Atsushi Yoritsune, Masanori Ochiai, Makoto Mizunami, Hiroshi Nishino
BACKGROUND: Facultative parthenogenesis, seen in many animal phyla, is a reproductive strategy in which females are able to generate offspring when mating partners are unavailable. In some subsocial and eusocial insects, parthenogenesis is often more prevalent than sexual reproduction. However, little is known about how social cooperation is linked to the promotion of parthenogenesis. The domiciliary cockroach Periplaneta americana is well-suited to addressing this issue as this species belongs to the superfamily Blattoidea, which diverged into eusocial termites and shows facultative parthenogenesis...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28331347/environmental-triggers-and-avoidance-in-the-management-of-asthma
#19
REVIEW
Clarisse Gautier, Denis Charpin
Identifying asthma triggers forms the basis of environmental secondary prevention. These triggers may be allergenic or nonallergenic. Allergenic triggers include indoor allergens, such as house dust mites (HDMs), molds, pets, cockroaches, and rodents, and outdoor allergens, such as pollens and molds. Clinical observations provide support for the role of HDM exposure as a trigger, although avoidance studies provide conflicting results. Molds and their metabolic products are now considered to be triggers of asthma attacks...
2017: Journal of Asthma and Allergy
https://www.readbyqxmd.com/read/28317204/cockroach-allergen-serine-proteinases-isolation-sequencing-and-signalling-via-proteinase-activated-receptor-2-par2
#20
Danny J Polley, Koichiro Mihara, Rithwik Ramachandran, Harissios Vliagoftis, Bernard Renaux, Mahmoud Saifeddine, Michael O Daines, Scott Boitano, Morley D Hollenberg
BACKGROUND: Allergy to the German cockroach (Blattella germanica) is a significant asthma risk factor for inner-city communities. Cockroach, like other allergens, contains trypsin-like enzyme activity that contributes to allergenicity and airway inflammation by activating proteinase-activated receptors (PARs). To date, the enzymes responsible for the proteolytic activity of German cockroach allergen have not been characterized. OBJECTIVES: We aimed to identify, isolate and characterize the trypsin-like proteinases in German cockroach allergen extracts used for clinical skin tests...
March 20, 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
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