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Search Results: 1 - 10 of 5509 matches for " Biting pattern "
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Aspectos ecológicos de Aedes albopictus (Skuse, 1894) en Caracas, Venezuela
Zorrilla,Adriana; Quintero,Loriana; Del Ventura,Fabiola; Mu?oz,Manuel; Moncada,Nelson; Navarro,Juan-Carlos;
Boletín de Malariología y Salud Ambiental , 2011,
Abstract: we have collected specimens of all life cycle phases of aedes albopictus in caracas city. it occurs mainly in parks and green areas of the city between 900 to 1,490 m altitude, in the following breeding sites: bamboo internodes, fallen spathes of palm, plastic cans, flower pots, bromeliads and water tanks. the females′s biting pattern was bimodal, with a first peak between 7:30-9:30 and the second around 14:30-17:30. the ingurgitation time was 1-2 minutes and the host localization and biting activity was no far from breeding and resting sites. with these preliminary ecological results, we pretend produce useful information to design strategies for ae. albopictus detection and control. we propose considerations and suggestions for an efficient specimen detection and identification by mean of venezuelan public health institutions.
Biting on human body parts of Simulium vectors and its implication for the manifestation of Onchocerca nodules along Osun River, southwestern Nigeria
Monsuru Adebayo Adeleke , Sammy Olufemi Sam-Wobo , Olaoluwa Pheabian Akinwale , Ganiyu Olatunji Olatunde & Chiedu Felix Mafiana
Journal of Vector Borne Diseases , 2012,
Abstract: Background: The biting preference of Simulium vectors has been known to influence the distribution ofOnchocerca nodules and microfilariae in human body. There is, however, variation in biting pattern of Simuliumflies in different geographical locations. This study investigates the biting pattern on human parts by Simuliumvectors along Osun river system where Simulium soubrense Beffa form has been implicated as the dominantvector and its possible implication on the distribution of Onchocerca nodules on human body along the river.Methods: Flies were collected by consented fly capturers on exposed human parts namely head/neck region,arms, upper limb and lower limb in Osun Eleja and Osun Budepo along Osun river in the wet season (August–September) and the dry season (November–December) in 2008. The residents of the communities were alsoscreened for palpable Onchocerca nodules.Results: The results showed that number of flies collected below the ankle region was significantly higher thanthe number collected on other exposed parts (p <0.05) while the least was collected on head/neck region in bothseasons. The lower trunk was the most common site (60%) for nodule location at Osun Eleja followed by uppertrunk (40%). Nodules were not found in the head and limb regions. At Osun Budepo, the upper trunk was themost common site of the nodule location (53.8%) followed by the lower trunk (38.5%) and head region (7.7%).Conclusion: Though, most of the flies were caught at the ankle region, the biting of other parts coupled with thepresence of nodules at the head and upper trunk regions showed that Simulium vectors could obtain microfilariaefrom any part of the body, thus increasing the risk of onchocerciasis transmission.
Characterization of malaria transmission by vector populations for improved interventions during the dry season in the Kpone-on-Sea area of coastal Ghana
Tchouassi David P,Quakyi Isabella A,Addison Ebenezer A,Bosompem Kwabena M
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-212
Abstract: Background Malaria is a major public health problem in Ghana. We present a site-specific entomological study of malaria vectors and transmission indices as part of an effort to develop a site for the testing of improved control strategies including possible vaccine trials. Methods Pyrethrum spray catches (PSC), and indoor and outdoor human landing collections of adult female anopheline mosquitoes were carried out over a six-month period (November 2005 - April 2006) at Kpone-on-Sea, a fishing village in southern Ghana. These were morphologically identified to species level and sibling species of the Anopheles gambiae complex further characterized by the polymerase chain reaction (PCR). Enzyme-linked immunosorbent assay was used to detect Plasmodium falciparum mosquito infectivity and host blood meal sources. Parity rate was examined based on dilatation of ovarian tracheoles following dissection. Results Of the 1233 Anopheles mosquitoes collected, An. gambiae s.l. was predominant (99.5%), followed by An. funestus (0.4%) and An. pharoensis (0.1%). All An. gambiae s.l. examined (480) were identified as An. gambiae s.s. with a majority of M molecular form (98.2%) and only 1.8% S form with no record of M/S hybrid. A significantly higher proportion of anophelines were observed outdoors relative to indoors (χ2 = 159.34, df = 1, p < 0.0000). Only An. gambiae M molecular form contributed to transmission with a high degree of anthropophily, parity rate and an estimated entomological inoculation rate (EIR) of 62.1 infective bites/person/year. The Majority of the infective bites occurred outdoors after 09.00 pm reaching peaks between 12.00-01.00 am and 03.00-04.00 am. Conclusion Anopheles gambiae M molecular form is responsible for maintaining the status quo of malaria in the surveyed site during the study period. The findings provide a baseline for evidence-based planning and implementation of improved malaria interventions. The plasticity observed in biting patterns especially the combined outdoor and early biting behavior of the vector may undermine the success of insecticide-based strategies using insecticide treated nets (ITN) and indoor residual spray (IRS). As such, novel or improved vector interventions should be informed by the local malaria epidemiology data as it relates to vector behavior.
Nocturnal man biting habits of mosquito species in Serian, Sarawak, Malaysia  [PDF]
Ahmad Rohani, Ismail Zamree, Wan Najdah Wan Mohamad Ali, Azahari Abdul Hadi, Matusop Asmad, David Lubim, Zurainee Mohamed Nor, Lee Han Lim
Advances in Entomology (AE) , 2013, DOI: 10.4236/ae.2013.12009
Abstract:  Knowledge of the composition and biting habits of mosquito associated with endemic areas is important in establishing sound vector control programmes and understanding the epidemiology of vector borne diseases. The biting activity cycle of several mosquito species in Serian, Sarawak was observed and described. Collections were carried out indoors and outdoors for 12 hours from 6.00 pm to 6.00 am using human landing catch techniques. A total of 7271 mosquitoes comprising 27 species belonging to sixgenera were collected. Mansonia bonneae (23.6%) was the predominant species caught in the study areas followed by Culex vishnui (22.3%), Culex pseudovishnui (19.6%) and Culex tritaenorhynchus (13.7%). A high rate of human biting activity by Ma. bonneae was detected during November but the activity was low during January.The biting activity of Ma.bonneae was found higher outdoor compared to indoorand peaked at 7.00 pm-8.00 pm.Cx.vishnui also exhibited similar biting activity peak while Anopheles letiferex-hibited biting activity peaked at 12.00 am-1.00 am.Cx.pseudovishnui showed biting patterns which were almost similar between indoor and outdoor activity and could be considered active throughout the 12 hour period.

Wing pattern variation in the Patagonian biting midge, Forcipomyia (Forcipomyia) multipicta Ingram & Macfe (Diptera, Ceratopogonidae) Patrón de variación alar en la mosquita patagónica Forcipomyia (Forcipomyia) multipicta Ingram & Macfie (Diptera, Ceratopogonidae)
Gustavo R. Spinelli,Pablo I. Marino,Melina Mauad
Revista de la Sociedad Entomol?3gica Argentina , 2012,
Abstract: Examination of the type-series and non-type specimens of the Patagonian biting midge, Forcipomyia (Forcipomyia) multipicta Ingram & Macfie (Diptera: Ceratopogonidae), revealed considerable variation in wing patterns of both sexes. One pattern includes several distinct light spot areas, whereas another pattern (e.g, in the holotype) only features marginal light spots in cell r3, while other light spots are barely perceptible or absent. The cause(s) of the differential lack of dark macrotrichia in certain areas of the wing membrane in specimens of some series could not be attributed either to their age, sex, or method of preservation. El estudio de la serie-tipo y de ejemplares no típicos de la mosquita patagónica, Forcipomyia (Forcipomyia) multipicta Ingram & Macfie, reveló una variación considerable en el dise o alar de ambos sexos. Uno de los patrones incluye varias áreas claras distintivas, mientras que el otro dise o (e.g., en el holotipo) solo muestra áreas claras marginales en la celda r3, y algunas que son poco perceptibles o están ausentes. La(s) causa(s) de la pérdida diferencial de macrotriquias, en ciertas áreas de la membrana alar en ejemplares de diferentes series, no puede ser atribuida al sexo, edad de los ejemplares o método de preservación.
Rediscovery of Haematobosca zuluensis (Zumpt), (Diptera, Stomoxyinae): Re-description and amended keys for the genus
Braack Leo,Pont Adrian C
Parasites & Vectors , 2012, DOI: 10.1186/1756-3305-5-267
Abstract: Background Prior to this publication, the biting fly Haematobosca zuluensis (Zumpt, 1950) (Diptera, Muscidae, Stomoxyinae) was known only from a single male specimen collected in 1923 in Zululand, South Africa. Seven additional males were subsequently captured in the Kruger National Park of South Africa, one in 1984 and six in 1991, but remained unidentified until now. The genus includes species of considerable veterinary significance, but current keys for identification of species are misleading due to inadequate description of H. zuluensis. Methods External morphological features are described to enable species characterization, including intraspecific variability. Results This paper confirms the existence of H. zuluensis, expands its known range, provides a full description of males of the species, and gives an up to date set of keys for the 15 known species within the genus. Available records suggest that Haematobosca zuluensis is a low density species as yet known only from wildlife areas of South Africa. Conclusions The additional specimens of H. zuluensis have enabled an improved description of the species and an improved set of keys to identify constituent members of the genus.
A novel bio-sensor for registration of biting force in occlusally reactive single mandibular implant overdenture  [PDF]
Fahad H. Banasr, Manal R. Alammari
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.37063

Mandibular single denture opposed by maxillary natural dentition showed a great problem. However, mandibular implant overdenture treatment has gained considerable recognition. Ten male patients with complete mandibular edentulous arch and opposing arch have full natural dentition. Patients were divided into two groups. All patients received two endosseous titanium implants. In Group I, patients were rehabilitated with conventional implant retained overdentures. While in Group II, Patients were rehabilitated with occlusal reactive implant overdentures. A Novel proposed biosensor was used to measure the amount of biting force on the implant retained overdenture. Quantitative electromyographic (EMG) signals of the masseter and anterior fibers of temporalis muscles were recorded, filtered and directly interfaced with a computer to represent the data graphically. The mean amplitude (μV), turn, and activity were recorded at the baseline and after three months. The results revealed an increase in the muscle activity in group II after three months as compared to group I. Significant difference in bilateral biting force at the premolar-molar area was found between group I and group II after three months. This study concluded that a resilient implant overdenture denture could be a desirable treatment in mandibular overdenture supported by two implants with resilient attachment and opposing natural dentition due to its easy fabrication and durability in use and increased muscle activity.

Leptoconops nosopheris sp. n. (Diptera: Ceratopogonidae) and Paleotrypanosoma burmanicus gen. n., sp. n. (Kinetoplastida: Trypanosomatidae), a biting midge - trypanosome vector association from the Early Cretaceous
Poinar Jr., George;
Memórias do Instituto Oswaldo Cruz , 2008, DOI: 10.1590/S0074-02762008000500010
Abstract: leptoconops nosopheris sp. n. (diptera: ceratopogonidae) is described from a blood-filled female biting midge in early cretaceous burmese amber. the new species is characterized by a very elongate terminal flagellomere, elongate cerci, and an indistinct spur on the metatibia. this biting midge contained digenetic trypanosomes (kinetoplastida: trypanosomatidae) in its alimentary tract and salivary glands. these trypanosomes are described as paleotrypanosoma burmanicus gen. n., sp. n., which represents the first fossil record of a trypanosoma generic lineage.
For?as de mordida relacionadas a próteses parciais removíveis inferiores
PELLIZZER, Eduardo Piza;MUENCH, Antonio;
Revista de Odontologia da Universidade de S?o Paulo , 1998, DOI: 10.1590/S0103-06631998000400016
Abstract: the purpose of this study was to determine the biting forces of individuals wearing classes i, ii or iii partially removable mandibular dentures. upper jaws presented fixed bridges, classes i, ii or iii partially removable dentures, or complete dentures. measurements of biting forces were obtained by a gnathodynamometer. the conclusions were: classes i and ii presented low biting forces, specially far from the last abutment tooth; when the opposite arcade was a complete denture, biting forces were low; males presented higher biting forces than females; natural molars and bicuspids presented higher biting forces with class iii than with classes i or ii.
Temporomandibular joint loads in subjects with and without disc displacement
Laura Rei Iwasaki,Michael Crosby,Yoly Gonzalez,Willard D. McCall
Orthopedic Reviews , 2009, DOI: 10.4081/or.2009.e29
Abstract: The likelihood of development of degenerative joint disease (DJD) of the temporomandibular joint (TMJ) is related to the integrity of the TMJ disc. Predilection for mechanical failure of the TMJ disc may reflect inter-individual differences in TMJ loads. Nine females and eight males in each of normal TMJ disc position and bilateral disc displacement diagnostic groups consented to participate in our study. Disc position was determined by bilateral magnetic resonance images of the joints. Three-dimensional (3D) anatomical geometry of each subject was used in a validated computer-assisted numerical model to calculate ipsilateral and contralateral TMJ loads for a range of biting positions (incisor, canine, molar) and angles (1-13). Each TMJ load was a resultant vector at the anterosuperior-most mediolateral midpoint on the condyle and characterized in terms of magnitude and 3D orientation. Analysis of variance (ANOVA) was used to test for effects of biting position and angle on TMJ loads. Mean TMJ loads in subjects with disc displacement were 9.5-69% higher than in subjects with normal disc position. During canine biting, TMJ loads in subjects with disc displacement were 43% (ipsilateral condyle, p=0.029) and 49% (contralateral condyle, p=0.015) higher on average than in subjects with normal disc position. Biting angle effects showed that laterally directed forces on the dentition produced ipsilateral joint loads, which on average were 69% higher (p=0.002) compared to individuals with normal TMJ disc position. The data reported here describe large differences in TMJ loads between individuals with disc displacement and normal disc position. The results support future investigations of inter-individual differences in joint mechanics as a variable in the development of DJD of the TMJ.
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