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Sample records for exceptional anuran ear

  1. Interconnections between the Ears in Nonmammalian Vertebrates

    DEFF Research Database (Denmark)

    Feng, Albert S.; Christensen-Dalsgaard, J.

    2010-01-01

    Many of the nonmammalian vertebrates (anurans, lizards, crocodiles, and some bird species) have large, continuous air spaces connecting the middle ears and acoustically coupling the eardrums. Acoustical coupling leads to strongly enhanced directionality of the ear at frequencies where diffraction...

  2. The complex evolutionary history of the tympanic middle ear in frogs and toads (Anura)

    Science.gov (United States)

    Pereyra, Martín O.; Womack, Molly C.; Barrionuevo, J. Sebastián; Blotto, Boris L.; Baldo, Diego; Targino, Mariane; Ospina-Sarria, Jhon Jairo; Guayasamin, Juan M.; Coloma, Luis A.; Hoke, Kim L.; Grant, Taran; Faivovich, Julián

    2016-01-01

    Most anurans possess a tympanic middle ear (TME) that transmits sound waves to the inner ear; however, numerous species lack some or all TME components. To understand the evolution of these structures, we undertook a comprehensive assessment of their occurrence across anurans and performed ancestral character state reconstructions. Our analysis indicates that the TME was completely lost at least 38 independent times in Anura. The inferred evolutionary history of the TME is exceptionally complex in true toads (Bufonidae), where it was lost in the most recent common ancestor, preceding a radiation of >150 earless species. Following that initial loss, independent regains of some or all TME structures were inferred within two minor clades and in a radiation of >400 species. The reappearance of the TME in the latter clade was followed by at least 10 losses of the entire TME. The many losses and gains of the TME in anurans is unparalleled among tetrapods. Our results show that anurans, and especially bufonid toads, are an excellent model to study the behavioural correlates of earlessness, extratympanic sound pathways, and the genetic and developmental mechanisms that underlie the morphogenesis of TME structures. PMID:27677839

  3. The biological significance of acoustic stimuli determines ear preference in the music frog.

    Science.gov (United States)

    Xue, Fei; Fang, Guangzhan; Yang, Ping; Zhao, Ermi; Brauth, Steven E; Tang, Yezhong

    2015-03-01

    Behavioral and neurophysiological studies support the idea that right ear advantage (REA) exists for perception of conspecific vocal signals in birds and mammals. Nevertheless, few studies have focused on anuran species that typically communicate through vocalization. The present study examined the direction and latencies of orientation behaviors in Emei music frogs (Babina daunchina) produced in response to six auditory stimuli emitted by a speaker placed directly behind the subjects. The stimuli included male advertisement calls produced from within burrow nests, which have been shown to be highly sexually attractive (HSA), calls produced from outside burrows, which are of low sexual attractiveness (LSA), screech calls produced when frogs are attacked by snakes, white noise, thunder and silence. For all sound stimuli except the screech, the frogs preferentially turned to the right. Right ear preference was strongest for HSA calls. For the screech and thunder stimuli, there was an increased tendency for subjects to move further from the speaker rather than turning. These results support the idea that in anurans, right ear preference is associated with perception of positive or neutral signals such as the conspecific advertisement call and white noise, while a left ear preference is associated with perception of negative signals such as predatory attack. © 2015. Published by The Company of Biologists Ltd.

  4. Ear discharge

    Science.gov (United States)

    ... antibiotic medicines, which are placed in the ear. Antibiotics may be given by mouth if a ruptured eardrum from an ear infection is causing the discharge. Alternative Names Drainage from the ear; Otorrhea; Ear bleeding; ...

  5. Your Ears

    Science.gov (United States)

    ... Outer Ear: Catch the Wave The Middle Ear: Good Vibrations The Inner Ear: Nerve Signals Start Here Day or Night, Ears Keep You Upright Three Cheers for the Ears! en español Tus oídos Did you hear something? Maybe the sound you heard was as quiet as your cat licking her paws. Or maybe it was loud, ...

  6. Vocally mediated social recognition in anurans

    Science.gov (United States)

    Bee, Mark A.

    2005-09-01

    Anuran amphibians (frogs and toads) are among the most vocal of vertebrates and have long served as model systems for investigating the mechanisms and evolution of acoustic communication. Compared to higher vertebrates, however, the role of cognition in anuran communication has received less attention, at least in part due to the lack of evidence that juvenile anurans learn to produce signals or associate them with particular social contexts. Recent studies of social recognition in two anuran families indicate that territorial male frogs in some species are able to learn about and recognize the individually distinctive properties of the calls of nearby neighbors. For example, male bullfrogs (ranidae) learn about the pitch of a neighbor's vocalizations (an individually distinct voice property) and associate a familiar pitch with the location of the neighbor's territory. As in songbirds, this form of vocally mediated social recognition allows territory holders to direct low levels of aggression toward well-established neighbors, while maintaining a readiness to respond aggressively to more threatening strangers that may attempt a territory takeover. A brief review of currently available data will be used to illustrate how anurans can serve as model systems for investigating the role of cognition in acoustic communication.

  7. Pierced Ears

    Science.gov (United States)

    ... Medical Words En Español What Other Kids Are Reading Should You Fight a Bully? What You Need to Know About ... What's in this article? Getting Your Ears Pierced Metal Matters Taking Care of Your Ears If Your Ears ...

  8. Ear Tubes

    Science.gov (United States)

    ... of the ear drum or eustachian tube, Down Syndrome, cleft palate, and barotrauma (injury to the middle ear caused by a reduction of air pressure, ... specialist) may be warranted if you or your child has experienced repeated ... fluid in the middle ear, barotrauma, or have an anatomic abnormality that ...

  9. Airplane Ear

    Science.gov (United States)

    ... an imbalance in the air pressure in the middle ear and air pressure in the environment prevents your eardrum (tympanic membrane) from vibrating as ... eustachian tube. One end is connected to the middle ear. The other end has a ... in the environment changes rapidly, and your eustachian tube often doesn' ...

  10. Cauliflower Ear

    Science.gov (United States)

    ... way to prevent cauliflower ear. Wearing the right headgear when playing sports — especially contact sports — is a ... any sport where helmets or other forms of headgear are recommended or required (like football, baseball, hockey, ...

  11. Ear examination

    Science.gov (United States)

    ... to the side, or the child's head may rest against an adult's chest. Older children and adults may sit with the head tilted toward the shoulder opposite the ear being examined. The provider will ...

  12. Ear Problems

    Science.gov (United States)

    ... Women Hair Loss Hand/Wrist/Arm Problems Headaches Hearing Problems Hip Problems Knee Problems Leg Problems Lower Back ... have ear pain or redness but is having problems hearing?YesNo Back to Questions Step 3 Possible Causes ...

  13. Mechanical leverage in the middle ear of the American bullfrog, Rana catesbeiana.

    Science.gov (United States)

    Werner, Yehudah L

    2003-01-01

    Textbooks lump the middle ears of 'submammalian Tetrapoda' as being 'one-ossicle ears'. Conventionally the anuran middle ear is depicted with a shaft-like skeletal unit connecting the tympanic membrane to the inner ear. This shaft comprises mediad a long bony columella and laterad a short cartilaginous extracolumella. But dissection of Rana catesbeiana ears showed: the extracolumella, as long as the columella, is proximally expanded in the vertical plane, forming dorsal and ventral heads. The medio-dorsal head is movably jointed to the columella, between these two there is an obtuse angle ventrad; the extracolumellar medio-ventral head is anchored by a ligament to the middle-ear cavity ceiling. When the tympanic membrane moves outwards, pulling the extracolumella, the medio-dorsal head of the extracolumella must be forced inwards, rotating on the ventral anchorage, pushing the columella towards the inner ear. The ossicular chain thus includes a mechanical lever, possessing the magnitude of the ratio length:width of the extracolumella; this is additional to the lever known from the columellar footplate, which rotates on its firm ventral attachment. These levers are confirmed physiologically, by the difference between the inner-ear sensitivity (shown by isopotential audiograms of microphonic potentials) when stimulated by a vibrator first at the tympanic membrane, then at the proximal stump of the amputated columella. Perusal of the primary literature showed that this morphology is widespread among anuran ears. Copyright 2002 Elsevier Science B.V.

  14. [Anuran fauna from Salta city, Argentina].

    Science.gov (United States)

    Acosta, Rebeca; Mesones, Rosa Vera; Núñez, Alejandro

    2005-01-01

    The loss and transformation of habitat by anthropogenic activities is one of the main causes of biodiversity decrease. Amphibians are declining all over the world and one of the causes of this decline is thought to be habitat reduction. However, there are anuran populations in highly disturbed habitats, like cities. This study presents the ecological baseline needed to understand anuran communities in urban environments, for Salta City. Argentina (ca. 502,000 inhabitants). The sample was stratified by environments defined by infrastructure and geographic location. The species were identified by visual encounter techniques and by auditory transect during the 2002-2003 reproductive period. Three families, seven genera and twelve species were recorded and the species richness decreased from city border to center. Similarity index values among geographic areas was higher East-West (94.7) than South-West (33.3). Bufo arenarum was the only species recorded in all environments. Hyla andina and Odontophrynus americanus had a restricted distribution and are here considered vulnerable. The border effect can explain some distribution pattern in these populations. A map of the potential distribution of recorded species for Salta is provided.

  15. Ear Infections

    Science.gov (United States)

    ... can cause your child’s eardrum to rupture or pop, leaving a hole in the ear. The initial pop hurts, but actually relieves the pressure and pain. ... turns up the volume of the TV or music, is not responding to softer sounds or is ...

  16. Anurans as Intermediate and Paratenic Hosts of Helminth Infections in the Rainforest and Derived Savanna Biotopes of Southern Nigeria

    Directory of Open Access Journals (Sweden)

    Abigail A. Imasuen

    2012-01-01

    Full Text Available Anurans from the rainforest (Okomu National Park and derived savanna (Agbede locations in Nigeria were investigated for their role either as intermediate or paratenic hosts of helminth infections. A total of 269 anuran specimens (157 from the Okomu National Park and 112 from Agbede were examined. Metacercariae of a strigeoid trematode, two nematode species, a proteocephalid cestode, and an acanthocephalan were recovered from infected hosts. Except for the strigeoid trematode, which was only recorded in the rainforest, there was no ecological dichotomy in the distribution of the larval parasites recorded. Tree frogs from the rainforest only served as second intermediate hosts for the strigeoid trematode. The two nematode larvae (type I and type II found in the body cavity of the infected host are believed to use them as paratenic hosts. Tree frogs were the predominant intermediate hosts of the proteocephalid cestode larvae in the rainforest, while Ptychadena and Phrynobatrachus spp. served this function in the derived savanna. The occurrence of cystacanths in the anurans from both biotopes confirms their known role as paratenic host for acanthocephalans. Afrixalus dorsalis is a new host record for the ascaridoid nematode while the finding of the strigeoid trematode, the proteocephalid cestode larvae and acanthocephalan cystacanths in the anurans investigated represents new geographical records.

  17. Cosmetic ear surgery

    Science.gov (United States)

    Otoplasty; Ear pinning; Ear surgery - cosmetic; Ear reshaping; Pinnaplasty ... Cosmetic ear surgery may be done in the surgeon's office, an outpatient clinic, or a hospital. It can be performed under ...

  18. Travel Inside the Ear

    Medline Plus

    Full Text Available ... Info » Hearing, Ear Infections, and Deafness Travel Inside the Ear Video When sound waves reach your ear, ... heard a soft sound or a loud sound. The sound passes through the outer ear and is ...

  19. Ear Injuries (For Parents)

    Science.gov (United States)

    ... Cochlear Implants Ototoxicity (Ear Poisoning) Auditory Neuropathy Spectrum Disorder (ANSD) Dealing With Earwax Is Earwax Removal Safe? Hearing Evaluation in Children Middle Ear Infections Middle Ear Infections and Ear ...

  20. A Protocol for Aging Anurans Using Skeletochronology

    Science.gov (United States)

    McCreary, Brome; Pearl, Christopher A.; Adams, Michael J.

    2008-01-01

    Age distribution information can be an important part of understanding the biology of any population. Age estimates collected from the annual growth rings found in tooth and bone cross sections, often referred to as Lines of Arrested Growth (LAGs), have been used in the study of various animals. In this manual, we describe in detail all necessary steps required to obtain estimates of age from anuran bone cross sections via skeletochronological assessment. We include comprehensive descriptions of how to fix and decalcify toe specimens (phalanges), process a phalange prior to embedding, embed the phalange in paraffin, section the phalange using a microtome, stain and mount the cross sections of the phalange and read the LAGs to obtain age estimates.

  1. Anuran Call Survey Summary 2006 Canaan Valley National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Anuran call surveys were conducted at Canaan Valley National Wildlife Refuge in April-June 2006 using the protocol developed by the North American Amphibian...

  2. Anuran Survey Report 2003 Wertheim National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This report is a summary of a few different studies conducted at Wertheim National Wildlife Refuge between 1999-2002. It includes the Anuran Breeding Call Surveys...

  3. The anuran vocal sac: a tool for multimodal signalling

    Science.gov (United States)

    Starnberger, Iris; Preininger, Doris; Hödl, Walter

    2014-01-01

    Although in anurans the predominant mode of intra- and intersexual communication is vocalization, modalities used in addition to or instead of acoustic signals range from seismic and visual to chemical. In some cases, signals of more than one modality are produced through or by the anuran vocal sac. However, its role beyond acoustics has been neglected for some time and nonacoustic cues such as vocal sac movement have traditionally been seen as an epiphenomenon of sound production. The diversity in vocal sac coloration and shape found in different species is striking and recently its visual properties have been given a more important role in signalling. Chemosignals seem to be the dominant communication mode in newts, salamanders and caecilians and certainly play a role in the aquatic life phase of anurans, but airborne chemical signalling has received less attention. There is, however, increasing evidence that at least some terrestrial anuran species integrate acoustic, visual and chemical cues in species recognition and mate choice and a few secondarily mute anuran species seem to fully rely on volatile chemical cues produced in glands on the vocal sac. Within vertebrates, frogs in particular are suitable organisms for investigating multimodal communication by means of experiments, since they are tolerant of disturbance by observers and can be easily manipulated under natural conditions. Thus, the anuran vocal sac might be of great interest not only to herpetologists, but also to behavioural biologists studying communication systems. PMID:25389375

  4. Anurans in a Subarctic Tundra Landscape Near Cape Churchill, Manitoba

    Science.gov (United States)

    Reiter, M.E.; Boal, C.W.; Andersen, D.E.

    2008-01-01

    Distribution, abundance, and habitat relationships of anurans inhabiting subarctic regions are poorly understood, and anuran monitoring protocols developed for temperate regions may not be applicable across large roadless areas of northern landscapes. In addition, arctic and subarctic regions of North America are predicted to experience changes in climate and, in some areas, are experiencing habitat alteration due to high rates of herbivory by breeding and migrating waterfowl. To better understand subarctic anuran abundance, distribution, and habitat associations, we conducted anuran calling surveys in the Cape Churchill region of Wapusk National Park, Manitoba, Canada, in 2004 and 2005. We conducted surveys along ~l-km transects distributed across three landscape types (coastal tundra, interior sedge meadow-tundra, and boreal forest-tundra interface) to estimate densities and probabilities of detection of Boreal Chorus Frogs (Pseudacris maculata) and Wood Frogs (Lithobates sylvaticus). We detected a Wood Frog or Boreal Chorus Frog on 22 (87%) of 26 transects surveyed, but probability of detection varied between years and species and among landscape types. Estimated densities of both species increased from the coastal zone inland toward the boreal forest edge. Our results suggest anurans occur across all three landscape types in our study area, but that species-specific spatial patterns exist in their abundances. Considerations for both spatial and temporal variation in abundance and detection probability need to be incorporated into surveys and monitoring programs for subarctic anurans.

  5. Evaluation of the Status of Anuran Metapopulations on a Refuge in Suburban Maryland

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Because many anurans have well-defined breeding seasons and male anurans produce loud advertisement calls, surveys of these breeding choruses are believed to provide...

  6. Travel Inside the Ear

    Science.gov (United States)

    ... Home » Health Info » Hearing, Ear Infections, and Deafness Travel Inside the Ear Video When sound waves reach ... are smaller than an orange seed. It then travels into the inner ear, which is filled with ...

  7. Travel Inside the Ear

    Medline Plus

    Full Text Available ... Home » Health Info » Hearing, Ear Infections, and Deafness Travel Inside the Ear Video When sound waves reach ... are smaller than an orange seed. It then travels into the inner ear, which is filled with ...

  8. Anuran artifacts of preservation: 27 years later

    Directory of Open Access Journals (Sweden)

    Jessica L. Deichmann

    2009-07-01

    Full Text Available Measurements made on preserved anuran specimens are often used in studies of systematics, ecology and evolution. Here, we examine the effect of preservation on one of the most common measurement of frogs, snout-urostyle length (SUL. Preservation had significanteffects on the SUL of 13 of the 14 species of North American frogs included in this study, with all species decreasing in SUL by 0.31-5.62%. Smaller frog species did not shrink proportionally more or less than larger species. Absolute shrinkage was correlated with SUL and was greater in larger species. Within species, percent shrinkage was not significantly correlated with SUL in 10 species, but significantly greater for larger individuals in 3 species, and decreased with size in 1 species. Absolute shrinkage was statistically greater for larger individuals in 4 species. Our results agree with studies of morphological permutations in fish which show that most preservation-related changes take place within the first few months after initial preservation. We suggest that the potential consequences of using preserved specimens in research must be considered and that future studies continue to examine preservation effects, not only on frogs, but on all preserved specimens used in scientific investigations.

  9. Developmental morphology of the middle ear.

    Science.gov (United States)

    Nishizaki, K; Anniko, M

    1997-01-01

    The development of the murine middle ear was monitored both qualitatively and morphometrically by scanning electron microscopy from the 19th gestational day to the adult stage. At birth, the middle ear was less well developed than the inner ear. The tympanic membrane (TM) was obscured by occlusion of the external auditory canal. Ciliated cells and secretory granules were present in the middle ear epithelium already 5 days after birth (DAB). Keratin debris was discerned on the external layer of the TM 9 DAB. By 12 DAB, mesenchymal tissue had resorbed from the middle ear cavity, except around the upper part of the ossicles. The middle ear was immature at birth but developed rapidly until 12 DAB. When compared with the avian middle ear the mouse middle ear was basically similar to that of humans, although in the human the stapedial artery is vestigial whereas in the mouse it persists as an important vessel. In man, there is no orbicular apophysis and no gonial of the malleus. The hypotympanum of the human middle ear is less developed than that of the murine middle ear. The mouse external auditory canal matures postnatally until 12 DAB, while in humans its development is complete at birth.

  10. Play it by Ear

    DEFF Research Database (Denmark)

    Kammersgaard, Nikolaj Peter Iversen; Kvist, Søren Helstrup; Thaysen, Jesper

    2014-01-01

    The first antenna for ear-to-ear communication with a standard Bluetooth chip has the potential to improve hearing aid technology.......The first antenna for ear-to-ear communication with a standard Bluetooth chip has the potential to improve hearing aid technology....

  11. Pattern of parasitic infections in anurans from a mangrove ...

    African Journals Online (AJOL)

    The encysted ascaridoid larvae recovered from the stomach of Ptychadena oxyrynchus represents a new species and is an addition to the group of nematodes that use anurans as transport hosts. In conclusion, the mangrove environment at Ijala-Ikeren sustains a low diversity of amphibians which habour a low number of ...

  12. Anuran Species Composition of an Impacted Seasonal Lake in ...

    African Journals Online (AJOL)

    There is a possibility that the low species diversity recorded could be due to the impact of human activities around the Lake. The need to minimize human activities around water bodies is highly recommended to reduce species loss and ultimately, amphibian decline. Keywords: anuran diversity, impacted seasonal Lake, ...

  13. Parasitic infections of anurans from an urbanized rainforest biotope ...

    African Journals Online (AJOL)

    beetles) occasioned by habitat alteration. The high prevalence of C. leberrei in H. concolor is also presumed to be related to the abundance of mosquito vectors in the study area. We concluded that habitat alteration not only reduces anuran species ...

  14. Anuran distribution, diversity and conservation in South Africa ...

    African Journals Online (AJOL)

    1995-02-05

    Feb 5, 1995 ... overall conservation status of South African anurans, this paper aims 0) to identify centres of amphibian species rich- ness, endemism and Red Data Book (RDB) richness in South. Africa; (ii) to compare the locality of identified 'hot-spots' within South African biomes and protected areas; (iii) to assess the ...

  15. Proton pump-driven cutaneous chloride uptake in anuran amphibia

    DEFF Research Database (Denmark)

    Jensen, Lars Jørn; Willumsen, Niels J.; Amstrup, Jan

    2003-01-01

    Krogh introduced the concept of active ion uptake across surface epithelia of freshwater animals, and proved independent transports of Na(+) and Cl(-) in anuran skin and fish gill. He suggested that the fluxes of Na(+) and Cl(-) involve exchanges with ions of similar charge. In the so-called Krog...

  16. Forest degradation and its impact on anuran diversity and ...

    African Journals Online (AJOL)

    Mean totals of 27.69 and 6.53 anurans belonging to 26 species were recorded in 96 hours of combined VES and AES sampling during this study prior to the cutting of vegetation and after its cutting respectively. The highest number of species (26) was recorded during the rainy season prior to the cutting of vegetation, ...

  17. Swimmer's Ear (External Otitis)

    Science.gov (United States)

    ... scratching their ear canals when they try to clean their ears. This is especially true if they use cotton swabs or dangerously sharp small objects, like hair clips or bobby pins. Sometimes, in a person ...

  18. Ear Infection and Vaccines

    Science.gov (United States)

    ... an ENT Doctor Near You Ear Infection and Vaccines Ear Infection and Vaccines Patient Health Information News ... or may need reinsertion over time. What about vaccines? A vaccine is a preparation administered to stimulate ...

  19. Ear Plastic Surgery

    Science.gov (United States)

    ... due to trauma (e.g. car wreck or dog bite) or torn earlobes. Deformity of the ears may cause social anxiety and may make children vulnerable to teasing. Regardless of the origin of the ear deformity, these ear conditions can ...

  20. Exceptional phenomenology

    DEFF Research Database (Denmark)

    Aggerholm, Kenneth; Moltke Martiny, Kristian

    . Through exceptional cases we can gain a deeper understanding of the ordinary. This was already a guiding thread in Merleau-Ponty’s phenomenological investigations, but this paper will take the idea further by grounding the methodology in ‘hands on’ research in elite sport (football) and pathological cases...

  1. Changes in the blood composition of some anurans

    Directory of Open Access Journals (Sweden)

    Çiğdem Gül

    2011-12-01

    Full Text Available We examined some hematological parameters (red blood cell count, white blood cell count, haemoglobin concentration, hematocrit value, mean cell volume, mean cell haemoglobin, mean cell haemoglobin concentration and plasma total protein on five anuran species of terrestrial (Pseudepidalea viridis, Pelobates syriacus and Hyla arborea, semi-aquatic (Rana dalmatina and aquatic (Pelophylax ridibundus nature from Çanakkale, Turkey. Differences between males and females in terms of haemoglobin, hematocrit and mean cell volume in P. viridis were statistically significant. The RBC count was higher in terrestrial and aquatic species than in semi-aquatic species. Haemoglobin concentration, hematocrit value, MCV and MHC were higher in terrestrial species than in semi-aquatic and aquatic species. The MCHC values were all similar to each other. The plasma total protein was higher in terrestrial species than in aquatic species. To sum up, variations were detected in the some hematological parameters under examination among the anuran species.

  2. Exceptional Reductions

    CERN Document Server

    Marrani, Alessio; Riccioni, Fabio

    2011-01-01

    Starting from basic identities of the group E8, we perform progressive reductions, namely decompositions with respect to the maximal and symmetric embeddings of E7xSU(2) and then of E6xU(1). This procedure provides a systematic approach to the basic identities involving invariant primitive tensor structures of various irreprs. of finite-dimensional exceptional Lie groups. We derive novel identities for E7 and E6, highlighting the E8 origin of some well known ones. In order to elucidate the connections of this formalism to four-dimensional Maxwell-Einstein supergravity theories based on symmetric scalar manifolds (and related to irreducible Euclidean Jordan algebras, the unique exception being the triality-symmetric N = 2 stu model), we then derive a fundamental identity involving the unique rank-4 symmetric invariant tensor of the 0-brane charge symplectic irrepr. of U-duality groups, with potential applications in the quantization of the charge orbits of supergravity theories, as well as in the study of mult...

  3. AMERICAN EXCEPTIONALISM

    Directory of Open Access Journals (Sweden)

    Oana-Andreea Pirnuta

    2017-11-01

    Full Text Available In an interconnected world where foreign relations matter not only for resources or military alliances but also for cultural relationships, it is highly important to have a better understanding of the power relations among nations. The information carries certain meanings that have important outcomes thus defining the power of a given nation. Foreign policy is the channel through which global politics is exercised. International politics is a hierarchy of power being determined by important cultural, economic as well as geographical aspects. The reasons and strategies that are used in order to reach the outcomes in global politics represent the focus of the present paper. The United States has been the leader in international politics since the early 20th century due to its vast resources and wealth as well as its cultural output. America’s interest in preserving a democratic and free world has its foundation in the beliefs and values it stands for the aim of this paper is to question whether or not there is a concrete premise for the idea of American exceptionalism.

  4. Alternative life cycle strategies of Megalodiscus temperatus in tadpoles and metamorphosed anurans

    Directory of Open Access Journals (Sweden)

    Bolek M.G.

    2008-09-01

    Full Text Available Megalodiscus temperatus (Stafford, 1905 is a common paramphistome trematode of North American amphibians with a two host life cycle and has been reported to infect frogs and rarely tadpoles. In this study we document the alternative life cycle strategy of M. temperatus in tadpoles and metamorphosed anurans. We show through field work and experimental infections that M. temperatus can establish in both anuran life stages and worms become gravid and release eggs in both tadpoles and metamorphosed frogs. However, worms exhibit differences in route of infection, development, egg production, and diet in tadpoles and metamorphosed anurans. These alternative life history strategies of M. temperatus suggest different selective pressures on the development and reproductive success of these worms in tadpoles and metamorphosed anurans, and we discuss the evolutionary avenues for and constraints on amphibian trematode life cycles presented by these two different anuran life stages.

  5. Lowland extirpation of anuran populations on a tropical mountain

    Directory of Open Access Journals (Sweden)

    Marconi Campos-Cerqueira

    2017-11-01

    Full Text Available Background Climate change and infectious diseases threaten animal and plant species, even in natural and protected areas. To cope with these changes, species may acclimate, adapt, move or decline. Here, we test for shifts in anuran distributions in the Luquillo Mountains (LM, a tropical montane forest in Puerto Rico by comparing species distributions from historical (1931–1989and current data (2015/2016. Methods Historical data, which included different methodologies, were gathered through the Global Biodiversity Information Facility (GBIF and published literature, and the current data were collected using acoustic recorders along three elevational transects. Results In the recordings, we detected the 12 native frog species known to occur in LM. Over a span of ∼25 years, two species have become extinct and four species suffered extirpation in lowland areas. As a consequence, low elevation areas in the LM (<300 m have lost at least six anuran species. Discussion We hypothesize that these extirpations are due to the effects of climate change and infectious diseases, which are restricting many species to higher elevations and a much smaller area. Land use change is not responsible for these changes because LM has been a protected reserve for the past 80 years. However, previous studies indicate that (1 climate change has increased temperatures in Puerto Rico, and (2 Batrachochytrium dendrobatidis (Bd was found in 10 native species and early detection of Bd coincides with anurans declines in the LM. Our study confirms the general impressions of amphibian population extirpations at low elevations, and corroborates the levels of threat assigned by IUCN.

  6. 'Outrunning' the running ear

    African Journals Online (AJOL)

    Chantel

    Children in day-care centres are at a higher risk. • Breast-feeding less than 3 months. Other conditions which may mimic acute purulent otitis media should be considered when evaluating a patient with a running ear.These are listed in Table I. To outrun the running ear all these facts should be kept in mind when evaluating ...

  7. Travel Inside the Ear

    Medline Plus

    Full Text Available ... Search A–Z Index Español Menu Home Health Info Hearing, Ear Infections, and Deafness Balance Taste and ... Us Get Involved You are here Home » Health Info » Hearing, Ear Infections, and Deafness Travel Inside the ...

  8. Travel Inside the Ear

    Medline Plus

    Full Text Available ... Search form Search A–Z Index Español Menu Home Health Info Hearing, Ear Infections, and Deafness Balance ... Committees Contact Us Get Involved You are here Home » Health Info » Hearing, Ear Infections, and Deafness Travel ...

  9. Middle ear effusion

    African Journals Online (AJOL)

    NJSR

    organs including the skull and brain. Metastasis to the temporal bone is extremely rare. 1. An unusual presentation of isolated metastasis with middle ear effusion is reported. Case report. A 45 year old woman presented with a short history of blockage and pain in the right ear. She also complained of a feeling of pulsation in ...

  10. Ear drainage culture

    Science.gov (United States)

    ... a lab and placed on a special dish (culture media). The lab team checks the dish every day ... Medical findings based on ear anatomy Ear drainage culture ... PR. The clinician and the microbiology laboratory. In: Bennett JE, Dolin R, Blaser MJ, ...

  11. "Swimmer's Ear" (Otitis Externa) Prevention

    Science.gov (United States)

    ... infections, swimmer’s ear, and healthy swimming. "Swimmer's Ear" (Otitis Externa) What are the symptoms of swimmer's ear? ... Healthy page. Reference CDC. Estimated burden of acute otitis externa —United States, 2003–2007 . MMWR Morb Mortal ...

  12. Quantifying anuran microhabitat use to infer the potential for parasite transmission between invasive cane toads and two species of Australian native frogs.

    Science.gov (United States)

    Pizzatto, Lígia; Both, Camila; Shine, Richard

    2014-01-01

    Parasites that are carried by invasive species can infect native taxa, with devastating consequences. In Australia, invading cane toads (Rhinella marina) carry lungworm parasites (Rhabdias pseudosphaerocephala) that (based on previous laboratory studies) can infect native treefrogs (Litoria caerulea and L. splendida). To assess the potential of parasite transmission from the invader to the native species (and from one infected native frog to another), we used surveys and radiotelemetry to quantify anuran microhabitat use, and proximity to other anurans, in two sites in tropical Australia. Unsurprisingly, treefrogs spent much of their time off the ground (especially by day, and in undisturbed forests) but terrestrial activity was common at night (especially in anthropogenically modified habitats). Microhabitat overlap between cane toads and frogs was generally low, except at night in disturbed areas, whereas overlap between the two frog species was high. The situations of highest overlap, and hence with the greatest danger of parasite transmission, involve aggregations of frogs within crevices by day, and use of open ground by all three anuran species at night. Overall, microhabitat divergence between toads and frogs should reduce, but not eliminate, the transmission of lungworms from invasive toads to vulnerable native frogs.

  13. A lateralized functional auditory network is involved in anuran ...

    Indian Academy of Sciences (India)

    2016-10-05

    Oct 5, 2016 ... Right ear advantage (REA) exists in many land vertebrates in which the right ear and left hemisphere preferentially process conspecific acoustic stimuli such as those related to sexual selection. Although ecological and neural mechanisms for sexual selection have been widely studied, the brain networks ...

  14. Role of sediments in modifying the toxicity of two Roundup formulations to six species of larval anurans.

    Science.gov (United States)

    Fuentes, Latice; Moore, Lindsay J; Rodgers, John H; Bowerman, William W; Yarrow, Gregory K; Chao, Wayne Y

    2014-11-01

    The role of sediment in modifying the toxicity of the original formulation of Roundup® and Roundup WeatherMAX® was examined in aqueous laboratory tests. Six species of anurans (Bufo fowleri, Hyla chrysoscelis, Rana catesbeiana, Rana clamitans, Rana sphenocephala, and Rana pipiens) were exposed at Gosner stage 25 to concentrations of the 2 herbicide formulations in 96-h, static, nonrenewal experiments in the presence and absence of sediment. All species tested had lower median lethal concentration values in water-only exposures of both formulations compared with exposures with sediment. Sediment significantly altered the potency slopes in all tests with the exceptions of H. chrysoscelis and R. clamitans when exposed to the original formulation of Roundup and H. chrysoscelis and R. sphenocephala when exposed to Roundup WeatherMAX. Thresholds were significantly different in all tests, including those in which potency slopes did not differ. Based on water-sediment exposures of the original formulation of Roundup, all 6 species tested had a margin of safety when compared with the predicted environmental concentration of the highest label application rate. Of the 6 species, 5 had a margin of safety when exposed to Roundup WeatherMAX. During incidental exposures in the field, sediments and organic matter present in aquatic systems provide significant sources of environmental ligands. If used according to label instructions, both herbicides should pose minimal risk to anuran amphibians in actual field applications. Environ Toxicol Chem 2014;33:2616-2620. © 2014 SETAC. © 2014 SETAC.

  15. Colors and Some Morphological Traits as Defensive Mechanisms in Anurans

    Directory of Open Access Journals (Sweden)

    Luís Felipe Toledo

    2009-01-01

    Full Text Available Anurans may be brightly colored or completely cryptic. Generally, in the former situation, we are dealing with aposematism, and the latter is an example of camouflage. However, these are only simple views of what such colorations really mean and which defensive strategy is implied. For instance, a brightly colored frog may be part of a mimicry ring, which could be either Batesian, Müllerian, or Browerian. These are only examples of the diversity of color-usage systems as defensive strategies. Unfortunately, reports on the use of colors as defensive mechanisms are widespread in the available literature, and the possible functions are rarely mentioned. Therefore, we reviewed the literature and added new data to this subject. Then, we the use of colors (as defensive mechanism into categories. Mimicry was divided into the subcategories camouflage, homotypy, and nondeceitful homotypy, and these groups were also subcategorized. Dissuasive coloration was divided into behavioral display of colors, polymorphism, and polyphenism. Aposematism was treated apart, but aposematic colorations may be present in other defensive strategies. Finally, we propose functions and forms of evolution for some color systems in post-metamorphic anurans and hope that this review can be the basis for future research, even on other animal groups.

  16. Ear Problems in Swimmers

    Directory of Open Access Journals (Sweden)

    Mao-Che Wang

    2005-08-01

    Full Text Available Acute diffuse otitis externa (swimmer's ear, otomycosis, exostoses, traumatic eardrum perforation, middle ear infection, and barotraumas of the inner ear are common problems in swimmers and people engaged in aqua activities. The most common ear problem in swimmers is acute diffuse otitis externa, with Pseudomonas aeruginosa being the most common pathogen. The symptoms are itching, otalgia, otorrhea, and conductive hearing loss. The treatment includes frequent cleansing of the ear canal, pain control, oral or topical medications, acidification of the ear canal, and control of predisposing factors. Swimming in polluted waters and ear-canal cleaning with cotton-tip applicators should be avoided. Exostoses are usually seen in people who swim in cold water and present with symptoms of accumulated debris, otorrhea and conductive hearing loss. The treatment for exostoses is transmeatal surgical removal of the tumors. Traumatic eardrum perforations may occur during water skiing or scuba diving and present with symptoms of hearing loss, otalgia, otorrhea, tinnitus and vertigo. Tympanoplasty might be needed if the perforations do not heal spontaneously. Patients with chronic otitis media with active drainage should avoid swimming, while patients who have undergone mastoidectomy and who have no cavity problems may swim. For children with ventilation tubes, surface swimming is safe in a clean, chlorinated swimming pool. Sudden sensorineural hearing loss and some degree of vertigo may occur after diving because of rupture of the round or oval window membrane.

  17. Better Ear Health

    Science.gov (United States)

    ... requests or policy questions to our media and public relations staff at newsroom@entnet.org . Many medical conditions, ... This condition usually results from poor eustachian tube function concurrent with middle ear infection (otitis media), but ...

  18. Travel Inside the Ear

    Medline Plus

    Full Text Available Skip to main content U.S. Department of Health & Human Services National Institutes of Health Search Search form Search A–Z Index Español Menu Home Health Info Hearing, Ear Infections, and Deafness ...

  19. Vocal Anuran Community Monitoring with Automatic Recording Devices at Mattamuskeet National Wildlife Refuge Summary Report 2015

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — During 2015, the Southeast Region Inventory and Monitoring Branch conducted the first-ever, pilot vocal anuran monitoring project at Mattamuskeet National Wildlife...

  20. Anuran Point Count Species Abundance and Frequency 2001 Wertheim National Wildlife Refuge

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — These are summary sheets outlining the point count species abundance and frequency rates of anuran at Wertheim National Wildlife Refuge during the spring and summer...

  1. THE BLOOD PARASITES OF ANURANS FROM COSTA RICA WITH REFLECTIONS ON THE TAXONOMY OF THEIR TRYPANOSOMES

    National Research Council Canada - National Science Library

    Sherwin S. Desser

    2001-01-01

    During May 1997, specimens of 7 species of anurans, that included 5 Phrynohyas venulosa Laurenti, 5 Rana forreri Boulenger, 7 Rana vaillanti Brucchi, 6 Eleutherodactylus fitzingeri Schimdt, 4 Smilisca baudinii...

  2. Habitat and landscape characteristics underlying anuran community structure along an urban-rural gradient.

    Science.gov (United States)

    Pillsbury, Finn C; Miller, James R

    2008-07-01

    Urbanization has been cited as an important factor in worldwide amphibian declines, and although recent work has illustrated the important influence of broad-scale ecological patterns and processes on amphibian populations, little is known about the factors structuring amphibian communities in urban landscapes. We therefore examined amphibian community responses to wetland habitat availability and landscape characteristics along an urban-rural gradient in central Iowa, USA, a region experiencing rapid suburban growth. We conducted call surveys at 61 wetlands to estimate anuran calling activity, and quantified wetland habitat structure and landscape context. We used canonical correspondence analysis (CCA) to examine patterns in anuran community structure and identify the most important variables associated with those patterns. Urban density at the landscape scale had a significant negative influence on overall anuran abundance and diversity. While every species exhibited a decrease in abundance with increasing urban density, this pattern was especially pronounced for species requiring post-breeding upland habitats. Anurans most affected by urbanization were those associated with short hydroperiods, early breeding activity, and substantial upland habitat use. We suggest that broad-scale landscape fragmentation is an important factor underlying anuran community structure in this region, possibly due to limitations on the accessibility of otherwise suitable habitat in fragmented urban landscapes. This study underscores the importance of a regional approach to amphibian conservation in urban and urbanizing areas; in fragmented landscapes, a network of interconnected wetland and upland habitats may be more likely to support a successful, diverse anuran community than will isolated sites.

  3. [Inner Ear Hearing Loss].

    Science.gov (United States)

    Hesse, G

    2016-06-01

    Hearing loss is one of the most dominant handicaps in modern societies, which additionally very often is not realized or not admitted. About one quarter of the general population suffers from inner ear hearing loss and is therefore restricted in communicational skills. Demographic factors like increasing age play an important role as well as environmental influences and an increasing sound and noise exposure especially in leisure activities. Thus borders between a "classical" presbyacusis - if it ever existed - and envirionmentally induced hearing loss disappear. Today restrictions in hearing ability develop earlier in age but at the same time they are detected and diagnosed earlier. This paper can eventually enlighten the wide field of inner ear hearing loss only fragmentarily; therefore mainly new research, findings and developments are reviewed. The first part discusses new aspects of diagnostics of inner ear hearing loss and different etiologies. © Georg Thieme Verlag KG Stuttgart · New York.

  4. Ear, Hearing and Speech

    DEFF Research Database (Denmark)

    Poulsen, Torben

    2000-01-01

    An introduction is given to the the anatomy and the function of the ear, basic psychoacoustic matters (hearing threshold, loudness, masking), the speech signal and speech intelligibility. The lecture note is written for the course: Fundamentals of Acoustics and Noise Control (51001)......An introduction is given to the the anatomy and the function of the ear, basic psychoacoustic matters (hearing threshold, loudness, masking), the speech signal and speech intelligibility. The lecture note is written for the course: Fundamentals of Acoustics and Noise Control (51001)...

  5. Listening to the ear

    Science.gov (United States)

    Shera, Christopher A.

    Otoacoustic emissions demonstrate that the ear creates sound while listening to sound, offering a promising acoustic window on the mechanics of hearing in awake, listening human beings. That window is clouded, however, by an incomplete knowledge of wave reflection and transmission, both forth and back within the cochlea and through the middle ear. This thesis "does windows," addressing wave propagation and scattering on both sides of the middle ear. A summary of highlights follows. Measurements of the cochlear input impedance in cat are used to identify a new symmetry in cochlear mechanics-termed "tapering symmetry" after its geometric interpretation in simple models-that guarantees that the wavelength of the traveling wave changes slowly with position near the stapes. Waves therefore propagate without reflection through the basal turns of the cochlea. Analytic methods for solving the cochlear wave equations using a perturbative scattering series are given and used to demonstrate that, contrary to common belief, conventional cochlear models exhibit negligible internal reflection whether or not they accurately represent the tapering symmetries of the inner ear. Frameworks for the systematic "deconstruction" of eardrum and middle-ear transduction characteristics are developed and applied to the analysis of noninvasive measurements of middle-ear and cochlear mechanics. A simple phenomenological model of inner-ear compressibility that correctly predicts hearing thresholds in patients with missing or disarticulated middle-ear ossicles is developed and used to establish an upper bound on cochlear compressibility several orders of magnitude smaller than that provided by direct measurements. Accurate measurements of stimulus frequency evoked otoacoustic emissions are performed and used to determine the form and frequency variation of the cochlear traveling-wave ratio noninvasively. Those measurements are inverted to obtain the spatial distribution of mechanical

  6. Middle ear implants

    Directory of Open Access Journals (Sweden)

    K S Gangadhara Somayaji

    2013-01-01

    Full Text Available Hearing loss is becoming more common in the society living in cities with lot of background noise around, and frequent use of gadgets like mobile phones, MP3s, and IPods are adding to the problem. The loss may involve the conductive or perceptive pathway. Majority of the patients with conductive hearing loss will revert back to normal hearing levels with medical and/or surgical treatment. However, in sensorineural hearing loss, many factors are involved in the management. Though traditionally hearing aids in various forms are the most commonly used modality in managing these patients, there are some drawbacks associated with them. Implantable middle ear amplifiers represent the most recent breakthrough in the management of hearing loss. Middle ear implants are surgically implanted electronic devices that aim to correct hearing loss by stimulating the ossicular chain or middle ear. Of late, they are also being used in the management of congenital conductive hearing loss and certain cases of chronic otitis media with residual hearing loss. The article aims to provide general information about the technology, indications and contraindications, selection of candidates, available systems, and advantages of middle ear implants. (MEI

  7. Middle ear effusion

    African Journals Online (AJOL)

    NJSR

    Abstract. Carcinoma of the breast can metastasise to many organs. Metastasis to the temporal bone is rare and even when it does, it would usually spread to other parts of the body. This is a report of isolated metastasis to the temporal bone with middle ear effusion. Key words: Carcinoma, breast, metastasis, temporal bone, ...

  8. Ear surgery - slideshow

    Science.gov (United States)

    ... GO GO About MedlinePlus Site Map FAQs Customer Support Health Topics Drugs & Supplements Videos & Tools Español You Are Here: Home → Medical Encyclopedia → Ear surgery - series—Normal anatomy URL of this page: //medlineplus.gov/ency/presentations/ ...

  9. 'Outrunning' the running ear

    African Journals Online (AJOL)

    Chantel

    Local: reinfection with water in an ear with a perforation or ventilation tube, anatomical abnormalities of the ET. — Systemic: infections (e.g. tuberculosis), immune deficiency, systemic diseases (e.g. leukaemia, AIDS, diabetes, Wegener's granulomatosis, histiocytosis X), anaemia, allergies. Table I. Differential diagnosis of ...

  10. Travel Inside the Ear

    Medline Plus

    Full Text Available ... Health Search Search form Search A–Z Index Español Menu Home Health Info Hearing, Ear Infections, and ... and Smell Voice, Speech, and Language Información en español Statistics Health Resources Clinical Studies Research Extramural Research ...

  11. Flying and Your Child's Ears

    Science.gov (United States)

    ... flying. This sometimes uncomfortable sensation is related to pressure changes in the air space behind the eardrum (the middle ear). Normally, the Eustachian tube, a passageway that leads from the middle ear to the back of ... the nose, equalizes the air pressure in the middle ear to the outside air ...

  12. Allometry and sexually dimorphic traits in male anurans.

    Science.gov (United States)

    Schulte-Hostedde, A I; Kuula, S; Martin, C; Schank, C C M; Lesbarrères, D

    2011-05-01

    Allometry of secondary sexual traits has been the subject of recent debate, and the generality of positive allometry and its association with sexual selection have been recently questioned. Whereas some studies suggest an almost universal positive allometry for traits under sexual selection and isometry or a negative allometry for traits not under such pressure, other studies argue that this pattern results from the study of exaggerated (ornamental) traits. To answer the call for an examination of the allometry of less-exaggerated sexually selected traits, we have examined morphological data from 14 sexually dimorphic traits and six monomorphic traits from three anuran species. Although we found evidence of positive allometry in male secondary sexual traits of several species and populations, not all nonsexual traits were isometric or exhibited negative allometry. Furthermore, our results indicate that larger traits in the populations that we studied were not associated with greater allometric slopes. Therefore, our study is in line with the contention suggesting no specific kind of allometric pattern for sexual and nonsexual characters, and we can only advocate for further investigation of trait allometry and sexual selection to understand the complexity underlying the evolution of allometry in sexual traits. © 2011 The Authors. Journal of Evolutionary Biology © 2011 European Society For Evolutionary Biology.

  13. Ubiquity of the pathogenic chytrid fungus, Batrachochytrium dendrobatidis, in Anuran communities in Panamá.

    Science.gov (United States)

    Kilburn, Vanessa L; Ibáñez, Roberto; Sanjur, Oris; Bermingham, Eldredge; Suraci, Justin P; Green, David M

    2010-12-01

    The pathogenic chytrid fungus, Batrachochytrium dendrobatidis, has been implicated as the main driver of many enigmatic amphibian declines in neotropical sites at high elevation. Batrachochytrium dendrobatidis is thought to be a waterborne pathogen limited by temperature, and the extent to which it persists and causes disease in amphibians at lower elevations in the neotropics is not known. It also is unclear by what mechanism(s) B. dendrobatidis has emerged as a pathogenic organism. To test whether B. dendrobatidis is limited by elevation in Panamá, we sought to determine the prevalence and intensity of B. dendrobatidis in relation to anuran abundance and diversity using quantitative PCR (qPCR) analyses. Sites were situated at varying elevations, from 45 to 1215 m, and were at varying stages of epizootic amphibian decline, including pre-epizootic, mid-epizootic, 2 years post-epizootic, and 10 years post-epizootic. Batrachochytrium dendrobatidis was found in all sites regardless of elevation or stage of epizootic decline. Levels of prevalence and infection intensity were comparable across all sites except at the mid-epizootic site, where both prevalence and intensity were significantly higher than at other sites. Symptoms of chytridiomycosis and corresponding declines in amphibian populations were variably seen at all elevations along a post-epizootic gradient. Because it is inherently difficult to prove a negative proposition, it can neither be proven that B. dendrobatidis is truly not present where it is not detected nor proven that it is only recently arrived where it is detected. Thus, there will always be doubts about whether B. dendrobatidis is enzootic or invasive. In any case, our results, coupled with current knowledge, suggest most clearly that the disease, chytridiomycosis, may be novel and invasive, and that the pathogen, B. dendrobatidis either is, or is becoming, globally ubiquitous.

  14. Comparison of Middle Ear Visualization With Endoscopy and Microscopy.

    Science.gov (United States)

    Bennett, Marc L; Zhang, Dongqing; Labadie, Robert F; Noble, Jack H

    2016-04-01

    The primary goal of chronic ear surgery is the creation of a safe, clean dry ear. For cholesteatomas, complete removal of disease is dependent on visualization. Conventional microscopy is adequate for most dissection, but various subregions of the middle ear are better visualized with endoscopy. The purpose of the present study was to quantitatively assess the improved visualization that endoscopes afford as compared with operating microscopes. Microscopic and endoscopic views were simulated using a three-dimensional model developed from temporal bone scans. Surface renderings of the ear canal and middle ear subsegments were defined and the percentage of visualization of each middle ear subsegment, both with and without ossicles, was then determined for the microscope as well as for 0-, 30-, and 45-degree endoscopes. Using this information, we analyzed which mode of visualization is best suited for dissection within a particular anatomical region. Using a 0-degree scope provides significantly more visualization of every subregion, except the antrum, compared with a microscope. In addition, angled scopes permit visualizing significantly more surface area of every subregion of the middle ear than straight scopes or microscopes. Endoscopes offer advantages for cholesteatoma dissection in difficult-to-visualize areas including the sinus tympani and epitympanum.

  15. Acoustic characteristics of eight common Chinese anurans during the breeding season

    Science.gov (United States)

    ZHOU, Yi-Lin; QIU, Xia; FANG, Xiao-Bin; YANG, Lu-Yi; ZHAO, Yi; FANG, Teng; ZHENG, Wei-Hong; LIU, Jin-Song

    2014-01-01

    Anurans often have species-specific vocalizations. To quantify and compare the characteristics of anuran calls in Gutianshan National Nature Reserve, Zhejiang Province, we recorded the advertisement calls of eight species belonging to four families (Ranidae, Microhylidae, Megophryidae and Bufonidae) from June to September 2012 using Sony ICD-FX8 IC recorders. All recordings were analyzed using the “Praat” software. Five acoustics parameters were measured, including temporal traits (call duration, number of notes or pulse number/call) and spectral traits (fundamental frequency, the first three formants and dominant frequency). The characteristic parameters of Microhyla ornate and Fejervarya limnocharis calls were different as were the calls of some populations of the same species recorded in different regions. The advertisement calls of the eight species were specific. Our study has provided a useful reference for identifying the calls of some common Chinese anurans. PMID:24470453

  16. The blood parasites of anurans from Costa Rica with reflections on the taxonomy of their trypanosomes.

    Science.gov (United States)

    Desser, S S

    2001-02-01

    During May 1997, specimens of 7 species of anurans, that included 5 Phrynohyas venulosa Laurenti, 5 Rana forreri Boulenger, 7 Rana vaillanti Brucchi, 6 Eleutherodactylus fitzingeri Schimdt, 4 Smilisca baudinii Duméril and Bibron, 1 Leptodactylus melanonotus, and 3 Bufo marinus Linneaus, from the Guanacaste Conservation Area, Costa Rica were examined for blood parasites. Their hematozoan fauna included intraerythrocytic and intraleukocytic icosahedral viruses, a rickettsia (Aegyptianella sp.), 2 species of Hepatozoon, Lankesterella minima, 2 unknown species of apicomplexans, 9 morphologically distinct types of trypanosomes, and 2 species of microfilariae. Rana vaillanti, the most aquatic species of frog, harbored the most species of parasites. Recent evidence indicates that morphological changes in the highly pleomorphic trypanosomes of anurans from different geographical regions have not kept pace with biochemical (isozyme) and molecular (DNA sequence) changes. Describing new species based solely on bloodstream trypomastigotes is discouraged. Additional criteria described herein should be applied when naming new species of anuran trypanosomes.

  17. Habitat, food, and climate affecting leaf litter anuran assemblages in an Atlantic Forest remnant

    Science.gov (United States)

    Rievers, Camila Rabelo; Pires, Maria Rita Silvério; Eterovick, Paula Cabral

    2014-07-01

    Leaf litter anuran assemblages include both species that have terrestrial development and species that, during the breeding season, aggregate around bodies of water where their tadpoles develop. The resources used by these two groups in the leaf litter are likely to differ, as well as their sampled species richness, abundance and biomass as resource availability changes. We conducted a 12-month survey of leaf litter anuran assemblages at three forest areas in the largest Atlantic Forest remnant in the state of Minas Gerais in southeastern Brazil. Each month we estimated, based on capture rates, anuran species richness, abundance, and biomass as assemblage descriptors. We also measured variables that could potentially affect these descriptors in space and time: invertebrate litter fauna (abundance and richness of taxa), leaf litter biomass, and microclimatic conditions (air humidity, air and soil temperature, soil water content, and rainfall). We tested for differences in these variables among areas. We used general linear models to search for the variables that best explained variation in anuran abundance (based on capture rates) throughout the year. We analyzed species with terrestrial development (TD) and with aquatic larvae (AL) separately. We recorded 326 anurans of 15 species. Sampled anuran abundance (correlated to species richness and biomass) was explained by air humidity and/or invertebrate abundance for species with TD, and by soil water content or air humidity and leaf litter biomass for species with AL. The variability in the results of studies on leaf litter frogs that try to find variables to explain changes in community descriptors may be due to spatial variation of resources among areas and also to the fact that TD and AL species are frequently analyzed together, when in fact they are likely to show different responses to resources present in the leaf litter habitat, reflected on capture rates.

  18. An approach to the nomenclature of anuran musculature

    Directory of Open Access Journals (Sweden)

    Hoyos, Julio Mario

    2004-07-01

    Full Text Available Se propone un método particular para seleccionar, de los nombres ya existentes, el más apropiado para cada músculo, y un método general para escoger los nombres apropiados de las estructuras anatómicas. Estos nombres están basados en los Nomina Anatomica y en el Código de Nomenclatura Zoológica. Se utiliza la ley de prioridad para seleccionar el nombre del músculo, y se discuten los criterios de homología primaria, homología secundaria e identidad topográfica para reforzar la idea de estabilidad nomenclatural. Se sugiere una secuencia para establecer la correspondencia entre los nombres y la homología de las estructuras, comenzando con la identificación de la correspondencia topológica (homología primaria y terminando con el reconocimiento de la identidad topográfica y las homologías secundarias. A new nomenclature of anuran muscles and a general method to choose the appropriate names of anatomical structures are proposed. These names are based on the Nomina Anatomica and on the Code of Zoological Nomenclature. The law of priority is used to select the muscle name to adopt, and the criteria of primary homology, secondary homology, and topographic identity are discussed to encourage the idea of nomenclatural stability of anatomical structures. A sequence to establish a correspondence between names and the homology of structures is suggested, beginning with the identification of topological correspondence (primary homology and ending with the recognition of the topographic identity and secondary homologies.

  19. Chytridiomycosis widespread in Anurans of Northeastern United States

    Science.gov (United States)

    Longcore, J.R.; Longcore, J.E.; Pessier, Allan P.; Halteman, W.A.

    2007-01-01

    An emerging disease of amphibians caused by the chytrid fungus Batrachochytrium dendrobatidis has been associated with morbidity, mortality, and extinction of species. Typically, researchers have detected B. dendrobatidis only when examining amphibians for causes of mortalities; few data exist on infection rates where mortalities are lacking. During May?September 2000?2002 we obtained amphibian specimens killed by vehicles and others collected at remote off-road sites throughout Maine, USA, and from federal lands in 5 states in the Northeast. We detected infected specimens, mostly green frogs (Rana clamitans), at 5 of 7 national wildlife refuges, a federal waterfowl production area, and Acadia National Park. Seven of 9 species, including all Ranidae species, were infected throughout Maine; rates ranged from 14.6% in American toads (Bufo americanus) to 25.7% in northern leopard frogs (Rana pipiens). We did not detect any infections in 50 eastern gray tree frogs (Hyla versicolor) or 21 spring peepers (Pseudacris crucifer). Species that hibernate in terrestrial habitats seem to have lower rates of infection than species that hibernate in aquatic habitats. Infections peaked in spring and autumn and were associated with air temperatures optimal for B. dendrobatidis growth. The relatively high infection rates among species without documented die-offs suggest that either losses have occurred undetected, that the fungus is endemic and species have attained a level of resistance to infections becoming lethal, or that climatic conditions of the Northeast have a role in preventing infections from being lethal. Data on prevalence and distribution of this chytrid fungus in the Northeast may be useful in modeling its origins and predicting long-term ecosystem effects involving anurans.

  20. Molecular and cellular regulation of water homeostasis in anuran amphibians by aquaporins.

    Science.gov (United States)

    Suzuki, Masakazu; Tanaka, Shigeyasu

    2009-07-01

    Aquaporins (AQPs) are water channel proteins important for transcellular water transport. Anuran AQP family consists of at least AQP0-AQP5, AQP7-AQP10, and two anuran-specific types, designated as AQPa1 and AQPa2. In Hyla japonica, AQP2 (AQP-h2K) and two forms of AQPa2 (AQP-h2 and AQP-h3) reside in the tight-junctioned epithelial cells of three major osmoregulatory organs, i.e. AQP-h2K in the kidney, AQP-h2 in the urinary bladder, and both AQP-h2 and AQP-h3 in the ventral pelvic skin. They show translocation from the cytoplasmic pool to the apical plasma membrane in response to arginine vasotocin (AVT), thereby regulating water transport across the apical membrane. Tissue distribution of AQPa2 in five anuran species, from aquatic to arboreal habitats, suggests that AQP-h2 is a urinary bladder-type AQP, while AQP-h3 is a ventral pelvic skin-type AQP. Further, AQP-h2K seems to be specific to the kidney. On the other hand, Hyla AQP3 (AQPh3BL)is located in the basolateral plasma membrane of the tight epithelial cells, irrespective of AVT stimulation. These findings suggest that anuran AVT-dependent osmoregulatory organs utilize AQP3 at the exit site of the transepithelial water transport, whereas at the entry site they basically adopt different AQPs as translocatable water channels: h2-like AQPa2 in the urinary bladder, h3-like AQPa2 in the pelvic skin, andAQP2 in the kidney. Anuran AQP3 also shows an extensive distribution over the integument, and is located along the basolateral plasma membrane of principal cells of the epidermis. It is possible that anuran AQP3might protect the epidermis against cutaneous water loss by supplying water and glycerol. In addition,immunohistochemical studies suggest that anuran AQP3 and AQP5 might be involved in the isoosmotic fluid secretion from the mucous glands and Xenopus small granular glands, possibly aiding maintenance of the moist skin, cutaneous gas exchange, and thermoregulation. Intriguingly, genomic and molecular

  1. The visible ear simulator

    DEFF Research Database (Denmark)

    Sorensen, Mads Solvsten; Mosegaard, Jesper; Mikkelsen, Peter Trier

    2009-01-01

    material.Virtual training often requires the purchase of a program, a customized computer, and expensive peripherals dedicated exclusively to this purpose. MATERIALS AND METHODS: The Visible Ear freeware library of digital images from a fresh-frozen human temporal bone was segmented, and real-time volume......, 2D, or optional anaglyph stereoscopic 3D was achieved on a standard Core 2 Duo personal computer with a GeForce 8,800 GTX graphics card, and surgical interaction was provided through a relatively inexpensive (approximately $2,500) Phantom Omni haptic 3D pointing device. CONCLUSION: This prototype...

  2. Pressure difference receiving ears

    DEFF Research Database (Denmark)

    Michelsen, Axel; Larsen, Ole Næsbye

    2007-01-01

    waves behave in the air spaces leading to the interior surfaces of eardrums. A linear mathematical model with well-defined inputs is used for exploring how the directionality varies with the binaural directional cues and the amplitude and phase gain of the sound pathway to the inner surface...... of such pressure difference receiving ears have been hampered by lack of suitable experimental methods. In this review, we review the methods for collecting reliable data on the binaural directional cues at the eardrums, on how the eardrum vibrations depend on the direction of sound incidence, and on how sound...

  3. Bionic ear imaging.

    Science.gov (United States)

    Cerini, R; Faccioli, N; Barillari, M; De Iorio, M; Carner, M; Colletti, V; Pozzi Mucelli, R

    2008-03-01

    The aim of this study was to illustrate the different imaging features of middle and inner ear implants, brainstem implants and inferior colliculus implants. We retrospectively reviewed the computed tomography (CT) images of 468 patients with congenital or acquired transmissive or neurosensory hearing loss who underwent surgery. The implants examined were: 22 Vibrant Soundbridge implants, 5 at the long limb of the incus and 17 at the round window, 350 cochlear implants, 95 brainstem implants and 1 implant at the inferior colliculus. All patients underwent a postoperative CT scan (single or multislice scanner) and/or a Dentomaxillofacial cone-beam CT scan (CBCT) (axial and multiplanar reconstruction), and/or a plain-film radiography to visualise the correct position of the implant. The CBCT scan depicts Vibrant site of implant better than plain-film radiography, with a lower radiation dose compared to CT. For cochlear implants, a single plain radiograph in the Stenvers projection can directly visualise the electrodes in the cochlea. All patients with brainstem or inferior colliculus implants underwent postoperative CT to exclude complications and the assess correct implantation, but the follow-up of these implants can be performed by plain radiography alone. CT and CBCT scans are reliable and relatively fast methods for precisely determining the location of middle ear implants. CBCT is preferable to CT because of the lower radiation dose administered; a single plain-film radiograph is enough to visualise and follow-up cochlear, brainstem and inferior colliculus implants.

  4. How Many Parasites Species a Frog Might Have? Determinants of Parasite Diversity in South American Anurans.

    Directory of Open Access Journals (Sweden)

    Karla Magalhães Campião

    Full Text Available There is an increasing interest in unveiling the dynamics of parasite infection. Understanding the interaction patterns, and determinants of host-parasite association contributes to filling knowledge gaps in both community and disease ecology. Despite being targeted as a relevant group for conservation efforts, determinants of the association of amphibians and their parasites in broad scales are poorly understood. Here we describe parasite biodiversity in South American amphibians, testing the influence of host body size and geographic range in helminth parasites species richness (PSR. We also test whether parasite diversity is related to hosts' phylogenetic diversity. Results showed that nematodes are the most common anuran parasites. Host-parasite network has a nested pattern, with specialist helminth taxa generally associated with hosts that harbour the richest parasite faunas. Host size is positively correlated with helminth fauna richness, but we found no support for the association of host geographic range and PSR. These results remained consistent after correcting for uneven study effort and hosts' phylogenic correlation. However, we found no association between host and parasite diversity, indicating that more diversified anuran clades not necessarily support higher parasite diversity. Overall, considering both the structure and the determinants of PRS in anurans, we conclude that specialist parasites are more likely to be associated with large anurans, which are the ones harbouring higher PSR, and that the lack of association of PSR with hosts' clade diversification suggests it is strongly influenced by ecological and contemporary constrains.

  5. Turning into frogs: Asymmetry in forelimb emergence and escape direction in metamorphosing anurans.

    Science.gov (United States)

    Zechini, Luigi; Lilley, Alison; Waddell, Emily; Burns, Thomas J; Downie, J Roger; Walsh, Patrick T

    2017-11-01

    There is considerable debate about the pattern and origin of laterality in forelimb emergence and turning behaviour within amphibians, with the latter being poorly investigated in tadpoles around metamorphic climax. Using 6 species of metamorphosing anurans, we investigated the effect of asymmetrical spiracle location, and disturbance at the time of forelimb emergence, on the pattern of forelimb emergence. Turning behaviour was observed to assess whether motor lateralization occurred in non-neobatrachian anurans and was linked to patterns of forelimb emergence. Biases in forelimb emergence differed among species, supporting the hypothesis that asymmetrical spiracle position results in the same asymmetry in forelimb emergence. However, this pattern only occurred when individuals were undisturbed. Therefore, context at the time of the emergence of the forelimbs may be important, and might explain some discrepancies in the literature. Turning biases, unconnected to forelimb emergence, were found in Pipidae and Bombinatoridae, confirming the basal origin of lateralized behaviour among anurans. Turning direction in our metamorphs differed from the leftward bias commonly observed in tadpoles, but may be analogous to the prevalent right-"handedness" among adult anurans. Therefore, the transitions occurring during metamorphosis may affect lateralized behaviour and metamorphosis may be fruitful for understanding the development of lateralization.

  6. How Many Parasites Species a Frog Might Have? Determinants of Parasite Diversity in South American Anurans.

    Science.gov (United States)

    Campião, Karla Magalhães; Ribas, Augusto Cesar de Aquino; Morais, Drausio Honorio; da Silva, Reinaldo José; Tavares, Luiz Eduardo Roland

    2015-01-01

    There is an increasing interest in unveiling the dynamics of parasite infection. Understanding the interaction patterns, and determinants of host-parasite association contributes to filling knowledge gaps in both community and disease ecology. Despite being targeted as a relevant group for conservation efforts, determinants of the association of amphibians and their parasites in broad scales are poorly understood. Here we describe parasite biodiversity in South American amphibians, testing the influence of host body size and geographic range in helminth parasites species richness (PSR). We also test whether parasite diversity is related to hosts' phylogenetic diversity. Results showed that nematodes are the most common anuran parasites. Host-parasite network has a nested pattern, with specialist helminth taxa generally associated with hosts that harbour the richest parasite faunas. Host size is positively correlated with helminth fauna richness, but we found no support for the association of host geographic range and PSR. These results remained consistent after correcting for uneven study effort and hosts' phylogenic correlation. However, we found no association between host and parasite diversity, indicating that more diversified anuran clades not necessarily support higher parasite diversity. Overall, considering both the structure and the determinants of PRS in anurans, we conclude that specialist parasites are more likely to be associated with large anurans, which are the ones harbouring higher PSR, and that the lack of association of PSR with hosts' clade diversification suggests it is strongly influenced by ecological and contemporary constrains.

  7. Food and feeding habits of some anuran species in south-western ...

    African Journals Online (AJOL)

    Fossorial species (Hemisus marmoratus and H. guineensis) had isopterans as their major food item where as arboreal species (Leptopelis boulengeri, L. hyloides and Hyperolius guttulatus) had high occurrences of ants, bees and wasps in their diets. The morphology and habitat of anuran species have to a large extent a ...

  8. COMMON INFECTIONS OF THE EAR

    African Journals Online (AJOL)

    Enrique

    function, the recommended treatment is intravenous ciprofloxacin and ... respiratory tract infection. The infec- tion spreads to the middle ..... structures. The underlying pathophysiology of otitis externa is maceration of the skin of the external ear canal. The hair and lipid content of cerumen renders the ear canal impervious to ...

  9. Do habitat variables correlate anuran abundance in arid terrain of Rawalpindi–Islamabad Areas, Pakistan?

    Directory of Open Access Journals (Sweden)

    Ayesha Akram

    2015-07-01

    Full Text Available The quantification of anuran abundance and habitat provides valuable baseline data for future monitoring in areas of planned or anticipated human activities. We carried out the present study to see if anuran abundance is associated with habitat variables (water quality, gravel size and vegetation in Rawalpindi–Islamabad Area, Pakistan. We used area-constrained searches and quadrat method to gather data on anuran abundance and vegetation diversity, respectively, from September, 2012 to July, 2013. We recorded 28 ± 4.83 (mean number ± SE individuals of six anuran species from the study area. We recorded Euphlyctis cyanophlyctis (10 ± 2.39 as the most abundant anuran species while Microhyla ornata (<1 ± 0.09 as the least abundant species. The Kernel regression revealed strong and statistically significant association between habitat variables and abundance of Hoplobatrachus tigerinus (R2 = 0.678 and Bufo stomaticus (R2 = 0.624 but weak and statistically significant association between habitat variables and abundance of E. cyanophlyctis (R2 = 0.482; Duttaphrynus melanostictus (R2 = 0. 451; M. ornata (R2 = 0.223 and Limnonectes limnocharis (R2 = 0. 006. We concluded that the common frogs and toads in our area belong to families Dicroglossidae and Bufonidae while uncommon frogs are of family Microhylidae. We suggest inclusion of monitoring of water quality (dissolved oxygen and pH and maintenance of native wild vegetation particularly herbs, shrubs and hydrophytes of the area in the on-going and proposed development schemes of Rawalpindi–Islamabad Areas.

  10. Ear Reconstruction in Young Children.

    Science.gov (United States)

    Reinisch, John

    2015-12-01

    The use of a porous high-density polyethylene ear implant, rather than a costal cartilage framework, allows ear reconstruction in young children before they enter school. The fact that the growth of the normal ear matures early allows for good symmetry. If the implant is covered completely with a large, well-vascularized superficial parietal fascia flap and appropriately color-matched skin, an ear with excellent projection and definition can be obtained with minimal complications and long-term viability. Ear reconstruction in young children is preferred by the author because the necessary fascial flap coverage is thinner, easier to harvest than in older patients, and can be done in a single outpatient procedure with minimal discomfort or psychological trauma. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

  11. The Effect Of microbial Mats In The Decay Of Anurans With Implications For Understanding Taphonomic Processes In The Fossil Record.

    Science.gov (United States)

    Iniesto, M; Villalba, I; Buscalioni, A D; Guerrero, M C; López-Archilla, A I

    2017-03-24

    The pattern and sequence of the decomposition of the Pipidae African dwarf frog (Hymenochirus boettgeri) is tracked in an experiment with microbial mats in order to explore soft tissue preservation over three years. Frog decay in microbial mats is preceded by rapid entombment (25-30 days) and mediated by the formation of a sarcophagus, which is built by a complex microbial community. The frog carcasses maintained a variety of soft tissues for years. Labile organic structures show greater durability within the mat, cells maintain their general shape (bone marrow cells and adipocytes), and muscles and connective tissues (adipose and fibrous tendons) exhibit their original organic structures. In addition, other soft tissues are promptly mineralized (day 540) in a Ca-rich carbonate phase (encephalic tectum) or enriched in sulphur residues (integumentary system). The result is coherent with a bias in soft-tissue preservation, as some tissues are more likely to be conserved than others. The outcomes support observations of exceptionally preserved fossil anurans (adults and tadpoles). Decomposition in mats shows singular conditions of pH and dissolved oxygen. Mineralization processes could be more diverse than in simple heterotrophic biofilms, opening new taphonomic processes that have yet to be explored.

  12. 15 CFR 740.2 - Restrictions on all License Exceptions.

    Science.gov (United States)

    2010-01-01

    ...) Being made to Australia, Japan, New Zealand, or a NATO (North Atlantic Treaty Organization) member state... license requirements of § 742.11 of the EAR. (11) The item is a “military commodity” subject to ECCN 0A919, except that such military commodities may be reexported in accordance with § 740.11(b)(2)(ii) (official...

  13. Middle Ear Infections and Ear Tube Surgery (For Parents)

    Science.gov (United States)

    ... Hearing? Can Chronic Ear Infections Cause Long-Term Hearing Loss? First Aid: Earaches Auditory Neuropathy Spectrum Disorder (ANSD) Preparing Your Child for Surgery Hearing Evaluation in Children Anesthesia Basics ...

  14. Human ear recognition by computer

    CERN Document Server

    Bhanu, Bir; Chen, Hui

    2010-01-01

    Biometrics deals with recognition of individuals based on their physiological or behavioral characteristics. The human ear is a new feature in biometrics that has several merits over the more common face, fingerprint and iris biometrics. Unlike the fingerprint and iris, it can be easily captured from a distance without a fully cooperative subject, although sometimes it may be hidden with hair, scarf and jewellery. Also, unlike a face, the ear is a relatively stable structure that does not change much with the age and facial expressions. ""Human Ear Recognition by Computer"" is the first book o

  15. What Is an Ear Infection?

    Science.gov (United States)

    ... People, Places & Things That Help Feelings Q&A Movies & More Quizzes Kids' Dictionary of Medical Words En ... otoscope, the doctor can see your eardrum , the thin membrane between your outer and middle ear. The ...

  16. Middle Ear Infections (For Parents)

    Science.gov (United States)

    ... the pressure in the ear. When Else Are Antibiotics Needed? Antibiotics can be the right treatment for ... down with the bottle. Prevent exposure to secondhand smoke, which can increase the number and severity of ...

  17. Global Ear. Werke 2001 - 2006

    Index Scriptorium Estoniae

    2006-01-01

    Dresdenis muusikafestivalil "Global Ear" 23.3.03 esitusel Eesti heliloojate muusika: Helena Tulve "lumineux/opaque", Jaan Rääts "Meditation", Mirjam Tally "Aura", Mati Kuulberg "Sonate Nr.4", Mari Vihmand "Seitsmele"

  18. Anuran helminth communities from contrasting nature reserve and pasture sites in the Pantanal wetland, Brazil.

    Science.gov (United States)

    Campião, K M; Ribas, A C A; Silva, I C O; Dalazen, G T; Tavares, L E R

    2017-01-01

    Studies of amphibian macroparasites are relevant for the investigation of parasite community ecology and disease dynamics. Here, the parasite communities of five anuran species (Hypsiboas raniceps, Phyllomeduza azurea, Pseudis paradoxa, Leptodactylus fuscus and Leptodactylus podicipinus) are described from two habitats with different levels of preservation (pasture versus nature reserve). Specifically, we used mixed-effect models to test whether helminth species richness, prevalence and abundance differ between the two host collection sites. A total of 120 anuran individuals and 25 helminth parasite taxa were collected. Helminth communities differed between collection sites and among host species. In general, helminth species richness, prevalence and abundance were higher in hosts collected in the pond from the nature reserve. In all, these data help fill the gap in parasite biodiversity knowledge in a changing area, within a sensitive group of vertebrate hosts.

  19. Tadpole nutritional ecology and digestive physiology: Implications for captive rearing of larval anurans.

    Science.gov (United States)

    Pryor, Gregory S

    2014-01-01

    The adaptive tadpole stage allows anurans to exploit food resources in two vastly different environments, and the transition from aquatic larvae to terrestrial carnivores is both dramatic and complex. As seen in many other members of the freshwater aquatic community, the nutritional requirements and characteristic feeding strategies of anuran larvae (tadpoles) are extremely diverse, ranging from herbivory to carnivory and including predation and cannibalism, oophagy, coprophagy, filter-feeding, and hindgut microbial fermentation. Whereas tadpoles as a group are commonly considered herbivorous or omnivorous, many are specialists; understanding species-specific dietary habits is critical for captive rearing projects in zoos and amphibian habitat conservation efforts. Practical applications of this review also encompass studies of amphibian declines, herpetoculture, ecology and evolution, and comparative gastrointestinal morphology and physiology. © 2014 Wiley Periodicals, Inc.

  20. THE KARYOTYPE OF SEVEN SPECIES OF AMPHIBIANS (ANURAN ORDER FROM SOUTH-EAST SULAWESI

    Directory of Open Access Journals (Sweden)

    Nasaruddin -

    2009-06-01

    Full Text Available As chromosome of different species differs in the size, shape, and number, their caryotpes areexpected to provide a distinctive and characteristic feature of the organism. The caryotypes ofseven amphibian species : Limnonectes gruniens, L modestus, Rana (Hylarana chalconota,Fajervarya cancrivora, Polypedates celebensis, Bufo celebensis and B biporcatus of South EastSulawesi-origin were investigated. The result showed that the number of diploid chromosomes inthe seven anuran varied between 22-26. The highest diploid chromosomes were observed in Rchalconota, F cancrivora (26, followed by L gruniens, L modestus (24 and the lowest were observed22 in P celebensis, B celebensis and B biporcatus (22. In general, all the the seven anuran sharesfour metacentric chromosomes pairs which is in pairs No 5, 6, 9, and 10 respectively. Howeverdifferences were observed in other chromosomes pairs numbers among the seven species.

  1. Anurans, Northern Tocantins River Basin, states of Tocantins and Maranhão, Brazil.

    Directory of Open Access Journals (Sweden)

    2008-01-01

    Full Text Available This study presents a list of anurans in the northern region of the Tocantins River Basin (states of Tocantins and Maranhão, with information regarding seasonality, habitat, and microhabitat. We recorded 38 species in 15 genera and seven families. Most species (47 % occurred exclusively in open areas and only 11 % of the species were found in forest habitats. Around 82 % of species were observed in ponds and only 7 % occurred in streams. Regarding seasonality, 54 % were observed both in the rainy and dry seasons. The northern area of the Cerrado has being rapidly converted in monocultures and information on its anuran fauna is limited. Additional information on its biodiversity is needed in order to provide the framework for conservation strategies.

  2. The evolution of jumping performance in anurans: morphological correlates and ecological implications.

    Science.gov (United States)

    Gomes, F R; Rezende, E L; Grizante, M B; Navas, C A

    2009-05-01

    We investigated the evolution of anuran locomotor performance and its morphological correlates as a function of habitat use and lifestyles. We reanalysed a subset of the data reported by Zug (Smithson. Contrib. Zool. 1978; 276: 1–31) employing phylogenetically explicit statistical methods (n = 56 species), and assembled morphological data on the ratio between hind-limb length and snout-vent length (SVL) from the literature and museum specimens for a large subgroup of the species from the original paper (n = 43 species). Analyses using independent contrasts revealed that classifying anurans into terrestrial, semi-aquatic, and arboreal categories cannot distinguish between the effects of phylogeny and ecological diversification in anuran locomotor performance. However, a more refined classification subdividing terrestrial species into 'fossorials' and 'non-fossorials', and arboreal species into 'open canopy', 'low canopy' and 'high canopy', suggests that part of the variation in locomotor performance and in hind-limb morphology can be attributed to ecological diversification. In particular, fossorial species had significantly lower jumping performances and shorter hind limbs than other species after controlling for SVL, illustrating how the trade-off between burrowing efficiency and jumping performance has resulted in morphological specialization in this group.

  3. Pulmonary compliance and lung volume are related to terrestriality in anuran amphibians.

    Science.gov (United States)

    Withers, Philip C; Hedrick, Michael S; Drewes, Robert C; Hillman, Stanley S

    2014-01-01

    Dehydration tolerance of anuran amphibians is directly related to their ability to mobilize lymphatic reserves, with more terrestrial species having more effective lymph mobilization dependent on specialized skeletal muscles acting directly on the lymph sacs and via pulmonary ventilation. Consequently, we tested the hypothesis that pulmonary compliance, lung volume, and femoral lymphatic sac volume were related to terrestriality-and, hence, lymph mobilization-for 18 species of aquatic, semiaquatic, or terrestrial anuran amphibians. Lung compliance and volume were significantly related to body mass, but there was no significant phylogenetic pattern. There were significant habitat-related patterns for mass-corrected and phylogenetically corrected residuals for these pulmonary variables. Femoral lymph volume was significantly related to body mass, with no significant phylogenetic pattern, and there was only a weak correlation for habitat with mass-corrected and phylogenetically corrected residuals. These results suggest that pulmonary volume and compliance are strongly related to terrestriality in anuran amphibians and are under significant selection pressure to enhance lymph mobilization, but lymph sac volume does not appear to have a major role in adaptation to terrestriality.

  4. 3D printed bionic ears.

    Science.gov (United States)

    Mannoor, Manu S; Jiang, Ziwen; James, Teena; Kong, Yong Lin; Malatesta, Karen A; Soboyejo, Winston O; Verma, Naveen; Gracias, David H; McAlpine, Michael C

    2013-06-12

    The ability to three-dimensionally interweave biological tissue with functional electronics could enable the creation of bionic organs possessing enhanced functionalities over their human counterparts. Conventional electronic devices are inherently two-dimensional, preventing seamless multidimensional integration with synthetic biology, as the processes and materials are very different. Here, we present a novel strategy for overcoming these difficulties via additive manufacturing of biological cells with structural and nanoparticle derived electronic elements. As a proof of concept, we generated a bionic ear via 3D printing of a cell-seeded hydrogel matrix in the anatomic geometry of a human ear, along with an intertwined conducting polymer consisting of infused silver nanoparticles. This allowed for in vitro culturing of cartilage tissue around an inductive coil antenna in the ear, which subsequently enables readout of inductively-coupled signals from cochlea-shaped electrodes. The printed ear exhibits enhanced auditory sensing for radio frequency reception, and complementary left and right ears can listen to stereo audio music. Overall, our approach suggests a means to intricately merge biologic and nanoelectronic functionalities via 3D printing.

  5. Ear Disorders in Scuba Divers

    Directory of Open Access Journals (Sweden)

    MH Azizi

    2010-12-01

    Full Text Available History of underwater diving dates back to antiquity. Breath-hold technique in diving was known to the ancient nations. However, deep diving progressed only in the early decades of the 19th century as the result of advancements in efficient underwater technologies which subsequently led to invention of sophisticated sets of scuba diving in the 20th century. Currently, diving is performed for various purposes including commercial, recreational, military, underwater construction, oil industry, underwater archeology and scientific assessment of marine life. By increasing popularity of underwater diving, dive-related medical conditions gradually became more evident and created a new challenge for the health care professionals, so that eventually, a specialty the so-called “diving medicine” was established. Most of the diving-associated disorders appear in the head and neck. The most common of all occupational disorders associated with diving are otologic diseases. External otitis has been reported as the most common otolaryngologic problem in underwater divers. Exostosis of the external ear canal may be formed in divers as the result of prolonged diving in cold waters. Other disorders of the ear and paranasal sinuses in underwater divers are caused by barometric pressure change (i.e., barotraumas, and to a lesser extent by decompression sickness. Barotrauma of the middle ear is the most prevalent barotrauma in divers. The inner ear barotraumas, though important, is less common. The present paper is a brief overview of diving-related ear disorders particularly in scuba divers.

  6. Development of the inner ear.

    Science.gov (United States)

    Whitfield, Tanya T

    2015-06-01

    The vertebrate inner ear is a sensory organ of exquisite design and sensitivity. It responds to sound, gravity and movement, serving both auditory (hearing) and vestibular (balance) functions. Almost all cell types of the inner ear, including sensory hair cells, sensory neurons, secretory cells and supporting cells, derive from the otic placode, one of the several ectodermal thickenings that arise around the edge of the anterior neural plate in the early embryo. The developmental patterning mechanisms that underlie formation of the inner ear from the otic placode are varied and complex, involving the reiterative use of familiar signalling pathways, together with roles for transcription factors, transmembrane proteins, and extracellular matrix components. In this review, I have selected highlights that illustrate just a few of the many recent discoveries relating to the development of this fascinating organ system. Copyright © 2015 The Authors. Published by Elsevier Ltd.. All rights reserved.

  7. Does climate influence assemblages of anurans and lizards in a coastal area of north-eastern Brazil?

    Science.gov (United States)

    Rodrigues, João Fabrício Mota; Borges-Leite, Maria Juliana; Borges-Nojosa, Diva Maria

    2016-11-01

    Environmental factors influence diverse assemblage features such as species abundances, richness, and nestedness. Amphibians and reptiles play important roles in terrestrial ecosystems, but there is still a lack of information about the assemblages of these animals in many regions. In this study, we aimed to understand how environmental factors influence the anurans and lizards assemblages from São Gonçalo do Amarante, Ceará, Brazil. Herpetofauna samplings were performed monthly in São Gonçalo do Amarante from January 2008 to May 2009, excluding April 2008. We sampled animals (anurans and lizards) using pitfall traps and active searches. The abundance and richness of lizards were positively related to temperature and negatively related to precipitation. Anuran assemblage was not influenced by precipitation, but its abundance was negatively influenced by temperature. Temperature generated a nested pattern in the lizard assemblage, but precipitation did not produce this pattern in anurans. Finally, our results reinforce the importance of environmental factors, mainly temperature, in structuring assemblages of anurans and lizards.

  8. Blastema Tissue Formed at Experimentally-Created Rabbit Ear Hole

    Directory of Open Access Journals (Sweden)

    Mohamadreza Baghaban Eslaminejad

    2013-02-01

    Full Text Available   Objective(s: Throughout evolution, mammalians have increasingly lost their ability to regenerate structures however rabbits are exceptional since they develop a blastema in their ear wound for regeneration purposes. Blastema consists of a group of undifferentiated cells capable of dividing and differentiating into the ear tissue. The objective of the present study is to isolate, culture expand, and characterize blastema progenitor cells in terms of their in vitro differentiation capacity.   Materials and Methods: Five New Zealand white male rabbits were used in the present study. Using a punching apparatus, a 4-mm hole was created in the animal ears. Following 4 days, the blastema ring which was created in the periphery of primary hole in the ears was removed and cultivated. The cells migrated from the blastema were expanded through 3 successive subcultures and characterized in terms of their potential differentiation, growth characteristics, and culture requirements. Results: The primary cultures tended to be morphologically heterogeneous having spindly-shaped fibroblast-like cells as well as flattened cells. Fibroblast-like cells survived and dominated the cultures. These cells tended to have the osteogenic, chondrogenic, and adipogenic differentiation potentials. They were highly colonogenic and maximum proliferation was achieved when the cells were plated at density of 100 cells/cm2 in a medium which contained 10% fetal bovine serum (FBS. Conclusion: Taken together, blastema tissue-derived stem cells from rabbit ear are of mesenchymal stem cell-like population. Studies similar to this will assist scientist better understanding the nature of blastema tissue formed at rabbit ear to regenerate the wound.

  9. Exceptional Cable Television.

    Science.gov (United States)

    Hunt, Edmund B.; Reid, John E., Jr.

    1987-01-01

    Ways in which the resources of a university's special education, communication arts, and library services can be combined with those of special education consortiums or parent organizations to provide exceptional children and their parents and teachers with high-quality cable educational television programs that meet their varied needs are…

  10. On exceptional instanton strings

    NARCIS (Netherlands)

    Del Zotto, M.; Lockhart, G.

    According to a recent classification of 6d (1, 0) theories within F-theory there are only six “pure” 6d gauge theories which have a UV superconformal fixed point. The corresponding gauge groups are SU(3), SO(8), F4, E6, E7, and E8. These exceptional models have BPS strings which are also instantons

  11. External ear: An analysis of its uniqueness

    Directory of Open Access Journals (Sweden)

    Ruma Purkait

    2016-06-01

    Hence, the individuality of every ear has been confirmed which may find use in personal identification studies. The study is a step towards providing scientific support for admitting ear evidence in the Court of Law.

  12. DESING OF CYLINDIRICAL EAR OF POLISH

    Directory of Open Access Journals (Sweden)

    Yaşar KARAGÖZ

    2000-02-01

    Full Text Available Plough is an agricultural tool which is used for preparing land to male it ready for sowing. The funotion of lough is to break the compact land into small pieces and to allow a suitable condition for living of culture plants. The ear is the most important part of active plough surface. The geometrical form of ear determines the form of active surface together with the front iron tip. Ploughs are divided into two categories which are European and American types. There are important differencies betucen the European and American tyges with respect to ?, ß and ? angles. Gorjatschkin described the ear form of European ploughs under four main groups which are: 1. Cylindirical ear type, 2. Culture-form ear type, 3. Semi-curled ear type, 4. Curled ear type. In this work, the designing of cylindirical ear was studied.

  13. Middle ear infection (otitis media) (image)

    Science.gov (United States)

    Otitis media is an inflammation or infection of the middle ear. Acute otitis media (acute ear infection) occurs when there is ... which causes production of fluid or pus. Chronic otitis media occurs when the eustachian tube becomes blocked ...

  14. [Implantable middle ear hearing aids].

    Science.gov (United States)

    à Wengen, D F

    2004-01-01

    Conventional acoustic hearing aids are limited in their performance. Due to physical laws their amplification of sound is limited to within 5 kHz. However, the frequencies between 5 and 10 kHz are essential for understanding consonants. Words can only be understood correctly if their consonants can be understood. Furthermore noise amplification remains a problem with hearing aids. Other problems consist of recurrent infections of the external auditory canal, intolerance for occlusion of the ear canal, feedback noise, and resonances in speech or singing. Implantable middle ear hearing aids like the Soundbridge of Symphonix-Siemens and the MET of Otologics offer improved amplification and a more natural sound. Since the first implantation of a Soundbridge in Switzerland in 1996 almost one thousand patients have been implanted worldwide. The currents systems are semi-implantable. The external audio processor containing the microphone, computer chip, battery and radio system is worn in the hair bearing area behind the ear. Implantation is only considered after unsuccessful fitting of conventional hearing aids. In Switzerland the cost for these implantable hearing aids is covered by social insurances. Initially the cost for an implant is higher than for hearing aids. However, hearing aids need replacement every 5 or 6 years whereas implants will last 20 to 30 years. Due to the superior sound quality and the improved understanding of speech in noise, the number of patients with implantable hearing aids will certainly increase in the next years. Other middle ear implants are in clinical testing.

  15. Color perception influences microhabitat selection of refugia and affects monitoring success for a cryptic anuran species.

    Science.gov (United States)

    Cohen, Bradley S; MacKenzie, Michelle L; Maerz, John C; Farrell, Christopher B; Castleberry, Steven B

    2016-10-01

    Perceptual-biases are important for understanding an animal's natural history, identifying potential ecological traps, and for developing effective means to monitor individuals and populations. Despite research demonstrating anurans having a positive phototactic response towards blue colors, we do not yet understand if color cues are used functionally beyond sexual selection. The aim of our study was to determine if color cues are used in selecting microhabitat, and if anuran's blue-positive phototactic response could increase selection of artificial PVC refugia used to monitor cryptic camouflaging anuran species. We captured 32 Cope's Gray Treefrogs and placed them in mesh enclosures with three PVC tubes painted blue, brown, and white. Concurrently, we placed blue, brown, or unpainted white PVC tubes in stratified arrays around a treefrog breeding pond, and counted the number of occasions treefrogs occupied different colored PVC tubes. In the confined choice experiment, treefrogs selected blue tubes (48.3%) significantly more often than brown (28.5%) or white (23.2%) tubes. Our field experiment mirrored these findings (52.0% of capture events in blue, 29.0% in brown, and 19.0% in unpainted white tubes). Our results suggest color influences Cope's Gray Treefrog microhabitat selection, and they utilize color vision when choosing refugia. We demonstrate simple, small changes based on perceptual-biases can induce behaviors that may in turn have large impacts on sampling techniques used in monitoring and inventorying. Incorporating non-traditional physiological measures into animal inventorying and monitoring programs can be used in the future to improve conservation efforts. Copyright © 2016 Elsevier Inc. All rights reserved.

  16. Relative efficiency of anuran sampling methods in a restinga habitat (Jurubatiba, Rio de Janeiro, Brazil

    Directory of Open Access Journals (Sweden)

    C. F. D. Rocha

    Full Text Available Studies on anurans in restinga habitats are few and, as a result, there is little information on which methods are more efficient for sampling them in this environment. Ten methods are usually used for sampling anuran communities in tropical and sub-tropical areas. In this study we evaluate which methods are more appropriate for this purpose in the restinga environment of Parque Nacional da Restinga de Jurubatiba. We analyzed six methods among those usually used for anuran samplings. For each method, we recorded the total amount of time spent (in min., the number of researchers involved, and the number of species captured. We calculated a capture efficiency index (time necessary for a researcher to capture an individual frog in order to make comparable the data obtained. Of the methods analyzed, the species inventory (9.7 min/searcher /ind.- MSI; richness = 6; abundance = 23 and the breeding site survey (9.5 MSI; richness = 4; abundance = 22 were the most efficient. The visual encounter inventory (45.0 MSI and patch sampling (65.0 MSI methods were of comparatively lower efficiency restinga, whereas the plot sampling and the pit-fall traps with drift-fence methods resulted in no frog capture. We conclude that there is a considerable difference in efficiency of methods used in the restinga environment and that the complete species inventory method is highly efficient for sampling frogs in the restinga studied and may be so in other restinga environments. Methods that are usually efficient in forested areas seem to be of little value in open restinga habitats.

  17. Influence of low levels of water salinity on toxicity of nitrite to anuran larvae.

    Science.gov (United States)

    Shinn, C; Marco, A; Serrano, L

    2013-08-01

    Reactive nitrogen compounds such as nitrite (NO2(-)) are highly toxic to aquatic animals and are partly responsible for the global decline of amphibians. On some fish and Caudata amphibian species low levels of sodium chloride significantly reduce the toxicity of nitrite. However, the nitrite-salinity interaction has not been properly studied in anuran amphibians. To verify if chloride (Cl(-)) attenuates NO2(-) toxicity, eggs and larvae of three anuran species were subjected to a series of NO2(-) solutions combined with three salt concentrations (0, 0.4 and 2 or 0, 0.052 and 0.2gL(-1)NaCl). One of the species tested originated from two different populations inhabiting highly contrasted nutrient richness environments: lowland Doñana Natural Park and Sierra de Gredos Mountain. In general, the presence of Cl(-) increased survival and growth of lowland Pelophylax perezi and activity of mountain P. perezi larvae exposed to NO2(-), thus attenuating the toxicity of NO2(-) to developing amphibians. Mountain amphibian populations appeared to be much more sensitive to the concentrations of NO2(-) and Cl(-) used in this experiment than coastal conspecifics, suggesting possible adaptation of populations to local conditions. Nitrogen pollution in coastal wetlands poses a serious threat to aquatic organisms, causing direct toxicity or indirect effects via ecosystem eutrophication. The presence of low to medium levels of salinity that would be common in coastal wetlands may attenuate the direct effects of increasing concentrations of nitrogenous compounds in water bodies. Furthermore, treating cultures of endangered anurans with small amounts of NaCl may provide an additional protective measure. Copyright © 2013 Elsevier Ltd. All rights reserved.

  18. Change of guinea pig inner ear pressure by square wave middle ear cavity pressure variation

    NARCIS (Netherlands)

    Feijen, RA; Segenhout, JM; Albers, FWJ; Wit, HP

    The inner ear fluid pressure of guinea pigs was measured during square wave middle ear cavity pressure variation. Time constants were derived for the slopes of the inner ear pressure recovery curves after middle ear pressure change. A "single exponential" function did not fit well and therefore more

  19. Handedness and Preferred Ear for Telephoning.

    Science.gov (United States)

    Williams, Stephen M.

    1987-01-01

    Examined relationship between handedness and preferred ear for telephoning in 140 college students. Increased degree of sinistrality was associated with increased tendency to use left ear for telephoning. Found tendency to pick up telephone receiver with preferred hand and hold earpiece to ipsilateral ear. Results may relate to reports of reduced…

  20. Can Loud Music Hurt My Ears?

    Science.gov (United States)

    ... Videos for Educators Search English Español Can Loud Music Hurt My Ears? KidsHealth / For Kids / Can Loud Music Hurt My Ears? Print en español La música ... up? Oh! You want to know if loud music can hurt your ears . Are you asking because ...

  1. Phylogenetic signal in the acoustic parameters of the advertisement calls of four clades of anurans.

    Science.gov (United States)

    Gingras, Bruno; Mohandesan, Elmira; Boko, Drasko; Fitch, W Tecumseh

    2013-07-01

    Anuran vocalizations, especially their advertisement calls, are largely species-specific and can be used to identify taxonomic affiliations. Because anurans are not vocal learners, their vocalizations are generally assumed to have a strong genetic component. This suggests that the degree of similarity between advertisement calls may be related to large-scale phylogenetic relationships. To test this hypothesis, advertisement calls from 90 species belonging to four large clades (Bufo, Hylinae, Leptodactylus, and Rana) were analyzed. Phylogenetic distances were estimated based on the DNA sequences of the 12S mitochondrial ribosomal RNA gene, and, for a subset of 49 species, on the rhodopsin gene. Mean values for five acoustic parameters (coefficient of variation of root-mean-square amplitude, dominant frequency, spectral flux, spectral irregularity, and spectral flatness) were computed for each species. We then tested for phylogenetic signal on the body-size-corrected residuals of these five parameters, using three statistical tests (Moran's I, Mantel, and Blomberg's K) and three models of genetic distance (pairwise distances, Abouheif's proximities, and the variance-covariance matrix derived from the phylogenetic tree). A significant phylogenetic signal was detected for most acoustic parameters on the 12S dataset, across statistical tests and genetic distance models, both for the entire sample of 90 species and within clades in several cases. A further analysis on a subset of 49 species using genetic distances derived from rhodopsin and from 12S broadly confirmed the results obtained on the larger sample, indicating that the phylogenetic signals observed in these acoustic parameters can be detected using a variety of genetic distance models derived either from a variable mitochondrial sequence or from a conserved nuclear gene. We found a robust relationship, in a large number of species, between anuran phylogenetic relatedness and acoustic similarity in the

  2. Are the mechanisms for stream segregation shared among anurans and other tetrapods?

    DEFF Research Database (Denmark)

    Christensen-Dalsgaard, Jakob

    ). It has been shown that spatial release from masking is sharpened by 6 dB in the TS, and that neurons in the TS are selective for call rates and number of call pulses. However, recently electrical stimulation of tha- lamic structures have demonstrated possible attentional modulation of TS responses...... that could also function in stream segregation. The modulation was call-specific and could also enhance binaural cues. In conclusion, many of the elements involved in auditory segregation in other animals are also found in anurans. However, it is uncertain whether the underlying mechanisms are similar. One...

  3. Anuran amphibians of the urban region of Altamira (Oriental Amazonia, state of Pará, Brazil.

    Directory of Open Access Journals (Sweden)

    Flávio Bezerra Barros

    2009-06-01

    Full Text Available The present study aimed to take stock of the species of anurans in three localities of the urban region of Altamira, a municipal district in the west of the state of Pará (Oriental Amazonia. Collections were made between January and June of 2004. Fifteen species were recorded during the study. The family Hylidae was the most represented, with eight species. The data was compatible with the degree of conservation of the collection areas. The necessity of making new fauna inventories in all Brazilian biomes is of extreme urgency, particularly in the Amazon, given its vast extension and lack of inventories.

  4. Exceptionalism and globalism

    Directory of Open Access Journals (Sweden)

    John Cairns Jr

    2001-03-01

    Full Text Available ABSTRACT: Achieving sustainable use of the planet will require ethical judgments in both sciences and environmental politics. The purpose of this editorial is to discuss two paradigms, exceptionalism and globalism, that are important in this regard. Exceptionalism is the insistence that one set of rules or behaviors is acceptable for an individual or country but that a different set should be used for the rest of the world. For example, the disparity in per capita consumption of resources and economic status has increased dramatically in the last century, but the consumers of great amounts of resources do not feel a proportionate responsibility for addressing this issue. Globalism is defined as individual and societal willingness to diminish, postpone or forgo individual natural resource use to protect and enhance the integrity of the global ecological life support system. Increasing affluence and the still increasing human population, coupled with wide dissemination of information and an increasing awareness that humans occupy a finite planet, exacerbate this already difficult situation. Increased interest in sustainable use of the planet makes open discussion of these issues mandatory because individuals cannot function in isolation from the larger society of which they are a part. Similarly, no country can function in isolation from other countries, which collectively form an interactive mosaic. This discussion identifies some of the crucial issues related to exceptionalism and globalism, which must be addressed before sustainable use of the planet can be achieved.

  5. Carcinoid tumour of the middle ear

    LENUS (Irish Health Repository)

    Baig, Salman

    2012-09-01

    A case of middle ear mass in a young female from Ireland is described, who presented with left ear hearing loss and intermittent bloody discharge from the same ear. Examination under microscope revealed occlusive polyp in the left ear and a biopsy had been taken under general anaesthesia. Histopathology report described an adenoma \\/ carcinoid tumour of the middle ear confirmed by positive immunohistochemical staining. CT temporal bones revealed the extension of the disease. The patient underwent left tympanotomy and excision of the tumour. In general, these tumours are regarded as benign but may be mistaken for adenocarcinomas because of their histological heterogenecity.

  6. Exceptionality in vowel harmony

    Science.gov (United States)

    Szeredi, Daniel

    Vowel harmony has been of great interest in phonological research. It has been widely accepted that vowel harmony is a phonetically natural phenomenon, which means that it is a common pattern because it provides advantages to the speaker in articulation and to the listener in perception. Exceptional patterns proved to be a challenge to the phonetically grounded analysis as they, by their nature, introduce phonetically disadvantageous sequences to the surface form, that consist of harmonically different vowels. Such forms are found, for example in the Finnish stem tuoli 'chair' or in the Hungarian suffixed form hi:d-hoz 'to the bridge', both word forms containing a mix of front and back vowels. There has recently been evidence shown that there might be a phonetic level explanation for some exceptional patterns, as the possibility that some vowels participating in irregular stems (like the vowel [i] in the Hungarian stem hi:d 'bridge' above) differ in some small phonetic detail from vowels in regular stems. The main question has not been raised, though: does this phonetic detail matter for speakers? Would they use these minor differences when they have to categorize a new word as regular or irregular? A different recent trend in explaining morphophonological exceptionality by looking at the phonotactic regularities characteristic of classes of stems based on their morphological behavior. Studies have shown that speakers are aware of these regularities, and use them as cues when they have to decide what class a novel stem belongs to. These sublexical phonotactic regularities have already been shown to be present in some exceptional patterns vowel harmony, but many questions remain open: how is learning the static generalization linked to learning the allomorph selection facet of vowel harmony? How much does the effect of consonants on vowel harmony matter, when compared to the effect of vowel-to-vowel correspondences? This dissertation aims to test these two ideas

  7. Question mark ear deformity-revisited.

    Science.gov (United States)

    Al-Qattan, Mohammad M; Al-Qattan, Noha M

    2017-01-01

    We report on two unusual cases of Cosman (question mark) ear; both required modifications of the standard techniques for surgical correction. The first patient presented with a unilateral question mark ear and concurrent ear prominence and bulging of the cartilage of the anti-helix. Simultaneous correction was done using a combination of cartilage suturing/scoring (for the prominence and the cartilage bulge) as well as Al-Qattan's "v-y skin flap-cartilage graft-z-plasty" technique (for the correction of the ear cleft deformity). The second patient had aurico-condylar syndrome with bilateral ear deformity and complete separation of ear lobes from the external ear. Staged transposition followed by Al-Qattan's technique resulted in a satisfactory outcome. Level V, therapeutic study.

  8. Induced ovulation and egg deposition in the direct developing anuran Eleutherodactylus coqui

    Directory of Open Access Journals (Sweden)

    Estrada Alberto R

    2004-01-01

    Full Text Available Abstract This study investigates ovulation and egg deposition behaviors in the anuran Eleutherodactylus coqui from Puerto Rico in response to stimulation with gonadotropin and gonadotropin releasing hormones. Five hormones were tested by injection over a range of doses, including mammalian LHRH, avian LHRH, fish LHRH, D-Ala6, des-Gly10 ethylamide LHRH and hCG. We report a low level of ovulation and egg deposition in response to all hormones, with the most complete and consistent results from the non-natural D-Ala6, des-Gly10 ethylamide LHRH derivative. To confirm the viability of eggs produced in this manner we performed in vitro fertilization experiments that resulted in the development of normal frogs. Reproductive behaviors in E. coqui are apparently not controlled by a mammalian form of LHRH as reported in other common laboratory anuran species. D-Ala6, des-Gly10 ethylamide LHRH induces ovulation and deposition of mature and fertilizable eggs in E. coqui.

  9. Gut bacterial communities across tadpole ecomorphs in two diverse tropical anuran faunas

    Science.gov (United States)

    Vences, Miguel; Lyra, Mariana L.; Kueneman, Jordan G.; Bletz, Molly C.; Archer, Holly M.; Canitz, Julia; Handreck, Svenja; Randrianiaina, Roger-Daniel; Struck, Ulrich; Bhuju, Sabin; Jarek, Michael; Geffers, Robert; McKenzie, Valerie J.; Tebbe, Christoph C.; Haddad, Célio F. B.; Glos, Julian

    2016-04-01

    Animal-associated microbial communities can play major roles in the physiology, development, ecology, and evolution of their hosts, but the study of their diversity has yet focused on a limited number of host species. In this study, we used high-throughput sequencing of partial sequences of the bacterial 16S rRNA gene to assess the diversity of the gut-inhabiting bacterial communities of 212 specimens of tropical anuran amphibians from Brazil and Madagascar. The core gut-associated bacterial communities among tadpoles from two different continents strongly overlapped, with eight highly represented operational taxonomic units (OTUs) in common. In contrast, the core communities of adults and tadpoles from Brazil were less similar with only one shared OTU. This suggests a community turnover at metamorphosis. Bacterial diversity was higher in tadpoles compared to adults. Distinct differences in composition and diversity occurred among gut bacterial communities of conspecific tadpoles from different water bodies and after experimental fasting for 8 days, demonstrating the influence of both environmental factors and food on the community structure. Communities from syntopic tadpoles clustered by host species both in Madagascar and Brazil, and the Malagasy tadpoles also had species-specific isotope signatures. We recommend future studies to analyze the turnover of anuran gut bacterial communities at metamorphosis, compare the tadpole core communities with those of other aquatic organisms, and assess the possible function of the gut microbiota as a reservoir for protective bacteria on the amphibian skin.

  10. Sex reversal assessments reveal different vulnerability to endocrine disruption between deeply diverged anuran lineages

    Science.gov (United States)

    Tamschick, Stephanie; Rozenblut-Kościsty, Beata; Ogielska, Maria; Lehmann, Andreas; Lymberakis, Petros; Hoffmann, Frauke; Lutz, Ilka; Kloas, Werner; Stöck, Matthias

    2016-01-01

    Multiple anthropogenic stressors cause worldwide amphibian declines. Among several poorly investigated causes is global pollution of aquatic ecosystems with endocrine disrupting compounds (EDCs). These substances interfere with the endocrine system and can affect the sexual development of vertebrates including amphibians. We test the susceptibility to an environmentally relevant contraceptive, the artificial estrogen 17α-ethinylestradiol (EE2), simultaneously in three deeply divergent systematic anuran families, a model-species, Xenopus laevis (Pipidae), and two non-models, Hyla arborea (Hylidae) and Bufo viridis (Bufonidae). Our new approach combines synchronized tadpole exposure to three EE2-concentrations (50, 500, 5,000 ng/L) in a flow-through-system and pioneers genetic and histological sexing of metamorphs in non-model anurans for EDC-studies. This novel methodology reveals striking quantitative differences in genetic-male-to-phenotypic-female sex reversal in non-model vs. model species. Our findings qualify molecular sexing in EDC-analyses as requirement to identify sex reversals and state-of-the-art approaches as mandatory to detect species-specific vulnerabilities to EDCs in amphibians. PMID:27029458

  11. Comparative functional analysis of aquaporins/glyceroporins in mammals and anurans.

    Science.gov (United States)

    Krane, Carissa M; Goldstein, David L

    2007-07-01

    Maintenance of fluid homeostasis is critical to establishing and maintaining normal physiology. The landmark discovery of membrane water channels (aquaporins; AQPs) ushered in a new area in osmoregulatory biology that has drawn from and contributed to diverse branches of biology, from molecular biology and genomics to systems biology and evolution, and from microbial and plant biology to animal and translational physiology. As a result, the study of AQPs provides a unique and integrated backdrop for exploring the relationships between genes and genome systems, the regulation of gene expression, and the physiologic consequences of genetic variation. The wide species distribution of AQP family members and the evolutionary conservation of the family indicate that the control of membrane water flux is a critical biological process. AQP function and regulation is proving to be central to many of the pathways involved in individual physiologic systems in both mammals and anurans. In mammals, AQPs are essential to normal secretory and absorptive functions of the eye, lung, salivary gland, sweat glands, gastrointestinal tract, and kidney. In urinary, respiratory, and gastrointestinal systems, AQPs are required for proper urine concentration, fluid reabsorption, and glandular secretions. In anurans, AQPs are important in mediating physiologic responses to changes in the external environment, including those that occur during metamorphosis and adaptation from an aquatic to terrestrial environment and thermal acclimation in anticipation of freezing. Therefore, an understanding of AQP function and regulation is an important aspect of an integrated approach to basic biological research.

  12. Dual processing of sulfated steroids in the olfactory system of an anuran amphibian

    Directory of Open Access Journals (Sweden)

    Alfredo eSansone

    2015-09-01

    Full Text Available Chemical communication is widespread in amphibians, but if compared to later diverging tetrapods the available functional data is limited. The existing information on the vomeronasal system of anurans is particularly sparse. Amphibians represent a transitional stage in the evolution of the olfactory system. Most species have anatomically separated main and vomeronasal systems, but recent studies have shown that in anurans their molecular separation is still underway. Sulfated steroids function as migratory pheromones in lamprey and have recently been identified as natural vomeronasal stimuli in rodents. Here we identified sulfated steroids as the first known class of vomeronasal stimuli in the amphibian Xenopus laevis. We show that sulfated steroids are detected and concurrently processed by the two distinct olfactory subsystems of larval Xenopus laevis, the main olfactory system and the vomeronasal system. Our data revealed a similar but partially different processing of steroid-induced responses in the two systems. Differences of detection thresholds suggest that the two information channels are not just redundant, but rather signal different information. Furthermore, we found that larval and adult animals excrete multiple sulfated compounds with physical properties consistent with sulfated steroids. Breeding tadpole and frog water including these compounds activated a large subset of sensory neurons

  13. Sex reversal assessments reveal different vulnerability to endocrine disruption between deeply diverged anuran lineages.

    Science.gov (United States)

    Tamschick, Stephanie; Rozenblut-Kościsty, Beata; Ogielska, Maria; Lehmann, Andreas; Lymberakis, Petros; Hoffmann, Frauke; Lutz, Ilka; Kloas, Werner; Stöck, Matthias

    2016-03-31

    Multiple anthropogenic stressors cause worldwide amphibian declines. Among several poorly investigated causes is global pollution of aquatic ecosystems with endocrine disrupting compounds (EDCs). These substances interfere with the endocrine system and can affect the sexual development of vertebrates including amphibians. We test the susceptibility to an environmentally relevant contraceptive, the artificial estrogen 17α-ethinylestradiol (EE2), simultaneously in three deeply divergent systematic anuran families, a model-species, Xenopus laevis (Pipidae), and two non-models, Hyla arborea (Hylidae) and Bufo viridis (Bufonidae). Our new approach combines synchronized tadpole exposure to three EE2-concentrations (50, 500, 5,000 ng/L) in a flow-through-system and pioneers genetic and histological sexing of metamorphs in non-model anurans for EDC-studies. This novel methodology reveals striking quantitative differences in genetic-male-to-phenotypic-female sex reversal in non-model vs. model species. Our findings qualify molecular sexing in EDC-analyses as requirement to identify sex reversals and state-of-the-art approaches as mandatory to detect species-specific vulnerabilities to EDCs in amphibians.

  14. "COCHLEAR IMPLANTATION IN PATIENTS WITH INNER EAR MALFORMATIONS"

    Directory of Open Access Journals (Sweden)

    P. Borghei S. Abdi

    2004-08-01

    Full Text Available Performing cochlear implantation in patients with inner ear malformation has always been a matter of dispute. This study was designed to analyze the operative findings,complications, and postoperative performance of patients with inner ear anomalies who underwent cochlear implantation. Six patients with inner ear malformations underwent implantation in our academic tertiary referral center from 1997 to 2002. The average follow-up period was 27 months. Malformations included one incomplete partition, one common cavity, one narrow internal acoustic canal (IAC in a patient with Riley-Day syndrome and 3 cases of large vestibular aqueduct. All received multi-channel implants either Nucleus 22 or Clarion device. Facial nerve was anomalous in 2 cases. CSF gusher occurred in 4 patients, which was controlled with packing the cochleostomy site. In all cases, the full length of electrode array was inserted, except one with Mondini's dysplasia where insertion failed in the first operation and was referred to another center for a successful surgery on the opposite ear. No other surgical complications were encountered. In 4 cases, all the 22 electrodes could be activated. All patients showed improved hearing performance after implantation. Four showed open-set speech recognition. The one with narrow IAC showed improved awareness to environmental sounds. In the other case (common cavity, the perception tests could not be performed because of very young age. Cochlear implantation in patients with inner ear malformations is a successful way of rehabilitation, although complications should be expected and auditory responses may be highly variable and relatively moderate.

  15. Body size affects the predatory interactions between introduced American Bullfrogs (Rana catesbeiana) and native anurans in China: An experimental study

    Science.gov (United States)

    Wang, Y.; Guo, Z.; Pearl, C.A.; Li, Y.

    2007-01-01

    Introduced American Bullfrogs (Rana catesbeiana) have established breeding populations in several provinces in China since their introduction in 1959. Although Bullfrogs are viewed as a potentially important predator of Chinese native anurans, their impacts in the field are difficult to quantify. We used two experiments to examine factors likely to mediate Bullfrog predation on native anurans. First, we examined effects of Bullfrog size and sex on daily consumption of a common Chinese native (Rana limnocharis). Second, we examined whether Bullfrogs consumed similar proportions of four Chinese natives: Black-Spotted Pond Frog (Rana nigromaculata), Green Pond Frog (Rana plancyi plancyi), Rice Frog (R. limnocharis), and Zhoushan Toad (Bufo bufo gargarizans). We found that larger Rana catesbeiana consumed more R. limnocharis per day than did smaller R. catesbeiana, and that daily consumption of R. limnocharis was positively related to R. catesbeiana body size. When provided with adults of four anurans that differed significantly in body size, R. catesbeiana consumed more individuals of the smallest species (R. limnocharis). However, when provided with similarly sized juveniles of the same four species, R. catesbeiana did not consume any species more than expected by chance. Our results suggest that body size plays an important role in the predatory interactions between R. catesbeiana and Chinese native anurans and that, other things being equal, smaller species and individuals are at greater risk of predation by R. catesbeiana. Copyright 2007 Society for the Study of Amphibians and Reptiles.

  16. Transformation of the pectoral girdle in the evolutionary origin of frogs: insights from the primitive anuran Discoglossus

    Science.gov (United States)

    Havelková, Pavla; Roček, Zbyněk

    2006-01-01

    Using cleared-and-stained whole mounts and computer-aided three-dimensional reconstructions made from serial histological sections, we studied the development of the pectoral girdle in Discoglossus pictus, an extant member of an ancient frog lineage, represented for example by Eodiscoglossus from the Middle Jurassic to Early Cretaceous periods in Europe. Basic developmental features were compared with those of extinct Temnospondyli, considered to be the most probable anuran ancestors, and with Triadobatrachus, an early Triassic proanuran. In the endochondral girdle, the separate scapula and coracoid of Discoglossus and other anurans (completed by suprascapular and procoracoid cartilages) evolved from the compact scapulocoracoid of temnospondyls by paedomorphosis. In parallel, the dermal ossifications of the girdle were reduced to a small clavicle and cleithrum. The overall reduction in ossification of the anuran pectoral girdle supports the hypothesis of a paedomorphic origin for Anura. The almost simultaneous appearance of dermal and endochondral ossifications may be explained by the accumulation of developmental events during a short, distinct metamorphosis (which did not occur in neotenic temnospondyls living permanently in water). The sternal elements seem to be neomorphs for the most part, which help to cushion the shock of landing in jumping anurans but which also evolved as functional substitutes (insertion area for the pectoralis muscles) of the temnospondyl interclavicle. PMID:16822264

  17. CEPF Western Ghats Special Series : Diversity and distribution of anurans in Phansad Wildlife Sanctuary (PWS, northern Western Ghats of India

    Directory of Open Access Journals (Sweden)

    U. Katwate

    2013-02-01

    Full Text Available In global consequences of rapidly changing climate and increased amphibian population decline, mapping amphibian diversity in biodiversity hotspots is essential. In this study we have systematically studied anurans of Phansad Wildlife Sanctuary in terms of species diversity, population structure, threat status and distribution. We recorded a total of 22 anuran species, of which 11 species are endemic to Western Ghats biodiversity hotspot. Family Dicroglossidae was found to be more species-rich. Spatial and temporal variation in anuran diversity was observed by using Shannon diversity and evenness indices. Most of the endemic and threatened anuran species are found to be associated with evergreen undisturbed forest patches. Habitat parameters like humidity, forest type, canopy coverage, riparian canopy coverage, stream persistence and litter depth are found to be major variables governing species diversity and distribution. Major anthropogenic threats to amphibians of Phansad Wildlife Sanctuary are discussed along with future conservation objectives. With range extension of species like Fejervarya caperata and Minervarya sahyadris further north in the Western Ghats, taxonomic ambiguities recorded during study are discussed briefly.

  18. Is India the Exception?

    DEFF Research Database (Denmark)

    Nielsen, Klaus; Storm, Rasmus K.

    India is still the extreme under-achiever in international sport competitions. Whereas in China high growth rates have been accompanied by a huge improvement in its ranking in international sport events a similar impact of extraordinary growth rates is seemingly totally absent in the case of India....... Is India an exception? Several econometric studies have shown that income per capita is a significant variable explaining elite sport results such as results in the Olympic Games. From this stylized fact follows the hypothesis that 'above/below average' growth rates lead to relative improvements....../deterioration of elite sport results (with a time lag)’. However, this has not previously been tested, and the contingencies explaining the seemingly widely different developments in countries such as China and India have not been explored. This paper tests the above hypothesis by means of a study of the correlation...

  19. Is India the Exception?

    DEFF Research Database (Denmark)

    Nielsen, Klaus; Storm, Rasmus K.

    2013-01-01

    India is the extreme under-achiever in international sport competitions. This has only marginally changed with the recent promotion of the Indian economy into the league of BRIC nations. Whereas in China high growth rates have been accompanied by a huge improvement of its performance in internati......India is the extreme under-achiever in international sport competitions. This has only marginally changed with the recent promotion of the Indian economy into the league of BRIC nations. Whereas in China high growth rates have been accompanied by a huge improvement of its performance...... in international sport events a similar impact of extraordinary growth rates has been almost totally absent in the case of India. Is India an exception? Several econometric studies have shown that income per capita is a significant variable explaining elite sport results such as results in the Olympic Games. From...

  20. Giftedness: an exceptionality examined.

    Science.gov (United States)

    Robinson, A; Clinkenbeard, P R

    1998-01-01

    The study of giftedness has practical origins. High-level performance intrigues people. Theoretically, the study of giftedness is related to the psychology of individual differences and has focused on the constructs of intelligence, creativity, and motivation. At a practical level, the research is largely related to school and family contexts, which develop gifts and talents in children and youth. Although broadened definitions of giftedness have emerged, the most extensive body of research available for review concentrates on intellectual giftedness. The varying definitions of giftedness and the impact of social context and diversity on the development of talent pose significant challenges for the field. Finally, the study of exceptionally advanced performance provides insight into basic psychological processes and the school contexts that develop talents in children and youth.

  1. Observations on the use of tarantula burrows by the anurans Leptodactylus bufonius (Leptodactylidae and Rhinella major (Bufonidae in the Dry Chaco ecoregion of Bolivia

    Directory of Open Access Journals (Sweden)

    Christopher M. Schalk

    2014-06-01

    Full Text Available Some species of anurans have been observed utilizing burrows of other animals, such as rodents and tarantulas. Here we report the observations of two anuran species, Leptodactylus bufonius and Rhinella major, utilizing the burrows of tarantulas (Acanthoscurria sp.; Family Theraphosidae in the dry Chaco ecoregion of Bolivia. Both species of anurans never co-occurred with tarantulas in the burrows and used burrows that were wider in diameter and closer to breeding ponds as compared to the total available tarantula burrows in the area. These burrows may serve as refuges from predators, especially for conspicuous, calling males.

  2. On exceptional instanton strings

    Science.gov (United States)

    Del Zotto, Michele; Lockhart, Guglielmo

    2017-09-01

    According to a recent classification of 6d (1 , 0) theories within F-theory there are only six "pure" 6d gauge theories which have a UV superconformal fixed point. The corresponding gauge groups are SU(3) , SO(8) , F 4 , E 6 , E 7, and E 8. These exceptional models have BPS strings which are also instantons for the corresponding gauge groups. For G simply-laced, we determine the 2d N=(0,4) worldsheet theories of such BPS instanton strings by a simple geometric engineering argument. These are given by a twisted S 2 compactification of the 4d N=2 theories of type H 2 , D 4 , E 6 , E 7 and E 8 (and their higher rank generalizations), where the 6d instanton number is mapped to the rank of the corresponding 4d SCFT. This determines their anomaly polynomials and, via topological strings, establishes an interesting relation among the corresponding T 2 × S 2 partition functions and the Hilbert series for moduli spaces of G instantons. Such relations allow to bootstrap the corresponding elliptic genera by modularity. As an example of such procedure, the elliptic genera for a single instanton string are determined. The same method also fixes the elliptic genus for case of one F 4 instanton. These results unveil a rather surprising relation with the Schur index of the corresponding 4d N=2 models.

  3. New Nordic Exceptionalism

    DEFF Research Database (Denmark)

    Danbolt, Mathias

    2016-01-01

    . This article takes Kim and Einhorn’s intervention as a starting point for a critical discussion of the history and politics of Nordic image-building. The article suggests that the reason Kim and Einhorn’s speech passed as a serious proposal was due to its meticulous mimicking of two discursive formations...... that have been central to the debates on the branding of Nordicity over the last decades: on the one hand, the discourse of “Nordic exceptionalism,” that since the 1960s has been central to the promotion of a Nordic political, socio-economic, and internationalist “third way” model, and, on the other hand......, the discourse on the “New Nordic,” that emerged out of the New Nordic Food-movement in the early 2000s, and which has given art and culture a privileged role in the international re-fashioning of the Nordic brand. Through an analysis of Kim and Einhorn’s United Nations of Norden (UNN)-performance, the article...

  4. Exceptional composite dark matter

    Energy Technology Data Exchange (ETDEWEB)

    Ballesteros, Guillermo [Universite Paris Saclay, CEA, CNRS, Institut de Physique Theorique, Gif-sur-Yvette (France); Carmona, Adrian [CERN, Theoretical Physics Department, Geneva (Switzerland); Chala, Mikael [Universitat de Valencia y IFIC, Universitat de Valencia-CSIC, Departament de Fisica Teorica, Burjassot, Valencia (Spain)

    2017-07-15

    We study the dark matter phenomenology of non-minimal composite Higgs models with SO(7) broken to the exceptional group G{sub 2}. In addition to the Higgs, three pseudo-Nambu-Goldstone bosons arise, one of which is electrically neutral. A parity symmetry is enough to ensure this resonance is stable. In fact, if the breaking of the Goldstone symmetry is driven by the fermion sector, this Z{sub 2} symmetry is automatically unbroken in the electroweak phase. In this case, the relic density, as well as the expected indirect, direct and collider signals are then uniquely determined by the value of the compositeness scale, f. Current experimental bounds allow one to account for a large fraction of the dark matter of the Universe if the dark matter particle is part of an electroweak triplet. The totality of the relic abundance can be accommodated if instead this particle is a composite singlet. In both cases, the scale f and the dark matter mass are of the order of a few TeV. (orig.)

  5. Automatic sleep monitoring using ear-EEG

    OpenAIRE

    ,

    2017-01-01

    The monitoring of sleep patterns without patient’s inconvenience or involvement of a medical specialist is a clinical question of significant importance. To this end, we propose an automatic sleep stage monitoring system based on an affordable, unobtrusive, discreet, and long-term wearable in-ear sensor for recording the electroencephalogram (ear-EEG). The selected features for sleep pattern classification from a single ear-EEG channel include the spectral edge frequency and multi-scale fuzzy...

  6. EARS: Electronic Access to Reference Service.

    OpenAIRE

    Weise, F O; Borgendale, M

    1986-01-01

    Electronic Access to Reference Service (EARS) is a front end to the Health Sciences Library's electronic mail system, with links to the online public catalog. EARS, which became operational in September 1984, is accessed by users at remote sites with either a terminal or microcomputer. It is menu-driven, allowing users to request: a computerized literature search, reference information, a photocopy of a journal article, or a book. This paper traces the history of EARS and discusses its use, i...

  7. An Effective 3D Ear Acquisition System.

    Directory of Open Access Journals (Sweden)

    Yahui Liu

    Full Text Available The human ear is a new feature in biometrics that has several merits over the more common face, fingerprint and iris biometrics. It can be easily captured from a distance without a fully cooperative subject. Also, the ear has a relatively stable structure that does not change much with the age and facial expressions. In this paper, we present a novel method of 3D ear acquisition system by using triangulation imaging principle, and the experiment results show that this design is efficient and can be used for ear recognition.

  8. Protozoan parasites of four species of wild anurans from a local zoo in Malaysia.

    Science.gov (United States)

    Mohammad, K N; Badrul, M M; Mohamad, N; Zainal-Abidin, A H

    2013-12-01

    The parasitic protozoan fauna in sixty-six anurans comprising of Duttaphrynus melanostictus, Phrynoidis juxtaspera, Hylarana erythraea and Polypedates leucomystax collected from Zoo Negara Malaysia was investigated. The distribution and prevalence rate of parasitic species in the digestive tract and blood were examined. Seven species of intestinal protozoa (Opalina ranarum, Cepedea dimidiata, Nycthetorus cordiformis, Entamoeba ranarum, Iodamoeba butschlii, Endamoeba blattae, and Tritrichomonas sp.) and two species of blood protozoa (Lankesterella sp. and Trypanosoma sp.) were recorded. Opalina ranarum was the most common protozoan found in the rectum and intestine (prevalence rate: 34.8%) infecting all host species, with P. juxtaspera heavily infected with the parasite, whereas Tritrichomonas sp. was the least prevalent intestinal species infecting only D. melanostictus. Both Lankesterella sp. and Trypanosoma sp. were found in the blood of H. erythraea.

  9. In vitro fertilization and artificial activation of eggs of the direct-developing anuran Eleutherodactylus coqui

    Directory of Open Access Journals (Sweden)

    Toro Esteban

    2004-08-01

    Full Text Available Abstract Although much is known about the reproductive biology of pond-breeding frogs, there is comparatively little information about terrestrial-breeding anurans, a highly successful and diverse group. This study investigates the activation and in vitro fertilization of eggs of the Puerto Rican coqui frog obtained by hormonally induced ovulation. We report that spontaneous activation occurs in 34% of eggs, probably in response to mechanical stress during oviposition. Artificial activation, as evidenced by the slow block to polyspermy and the onset of zygote division, was elicited both by mechanical stimulation and calcium ionophore exposure in 64% and 83% of the cases, respectively. Finally, one in vitro fertilization protocol showed a 27% success rate, despite the fact that about one third of all unfertilized eggs obtained by hormone injection auto-activate. We expect these findings to aid in the conservation effort of Eleutherodactylus frogs, the largest vertebrate genus.

  10. Chromosome banding in Amphibia. XXXI. The neotropical anuran families Centrolenidae and Allophrynidae.

    Science.gov (United States)

    Schmid, Michael; Steinlein, Claus; Feichtinger, Wolfgang; Bogart, James P

    2014-01-01

    The mitotic chromosomes of 11 species from the anuran families Centrolenidae and Allophrynidae were analyzed by means of conventional staining, banding techniques, and in situ hybridization. The amount, location, and fluorochrome affinities of constitutive heterochromatin, the number and positions of nucleolus organizer regions, and the patterns of telomeric DNA sequences were determined for most of the species. The karyotypes were found to be highly conserved with a low diploid chromosome number of 2n = 20 and morphologically similar chromosomes. The sister group relationship between the Centrolenidae and Allophrynidae (unranked taxon Allocentroleniae) is clearly corroborated by the cytogenetic data. The existence of heteromorphic XY♂/XX♀ sex chromosomes in an initial stage of morphological differentiation was confirmed in Vitreorana antisthenesi. The genome sizes of 4 centrolenid species were determined using flow cytometry. For completeness and for comparative purposes, all previously published cytogenetic data on centrolenids are included. © 2014 S. Karger AG, Basel.

  11. Movements of the large intestine in the anuran larvae, Xenopus laevis.

    Science.gov (United States)

    Naitoh, T; Miura, A; Akiyoshi, H; Wassersug, R J

    1990-01-01

    1. The contractile behavior of the large intestine of Xenopus laevis tadpoles was studied. 2. The large intestine is divided into a colon and rectum, and shows three types of movements: rhythmic ascending (antiperistaltic) waves of contraction originating at the anal end of the large bowel, rhythmic longitudinal contractions in the rectum and colon, and irregular contractions. The first two patterns occur in the large bowel in situ and thus appear mature. The last one occurred only in older preparations, and thus appeared pathological. 3. Antiperistaltic waves of contractions and longitudinal contractions are generated independent of each other, suggesting that circular muscles and longitudinal muscles contract separately. 4. Acetylcholine, adrenaline and noradrenaline augment motility. 5. The premetamorphic motility of the large bowel is similar to that seen in adult frogs. Comparable motility was not observed elsewhere in the larval alimentary tract. The large intestine appears to be the first portion of the anuran alimentary tract to acquire the adult physiological and morphological profile.

  12. Roadside Abundance of Anurans within a Community Correlates with Reproductive Investment

    Directory of Open Access Journals (Sweden)

    Molly K. Grace

    2017-06-01

    Full Text Available Roads and their associated effects (road-kill, pollution, etc. have a largely negative impact on animals, especially amphibians, but not all species are affected to the same degree. Variation in life histories may explain some of these differences. Here, we examine how abundance of anuran species in roadside habitats is correlated with an aspect of reproductive life history: number of eggs produced by a female per year. Using data from a 1.5-year monitoring project in Central Florida, we found a positive correlation between the number of eggs produced by an average female of a species and the proportion of individuals found in roadside habitats compared to control habitats. This implies either that populations of species with a greater reproductive rate are able to rebound more quickly from negative road impacts, or that there is a strong selective pressure on species with low reproductive rates to avoid roads.

  13. Diet and resource partitioning among anurans in irrigated rice fields in Pantanal, Brazil

    Directory of Open Access Journals (Sweden)

    L. Piatti

    Full Text Available Artificial ponds or irrigated systems scattered throughout farmlands can offer important habitats for anurans and can be interesting sites for research on species resources use in a changing landscape. This study describes the diet and resource partitioning among anurans inhabiting irrigated rice fields in the Pantanal region. Twenty categories of prey were found in the stomachs of Leptodactylus chaquensis, L. elenae, L. podicipinus and Rhinella bergi, the most frequent being Coleoptera, Hymenoptera, larvae of Hexapoda, Hemiptera, Diptera and Orthoptera. The great differences found in the diet of these species in rice fields compared to other locations, according to available records in the literature, was the increased importance of Hemipitera and Orthoptera and the decrease in importance of Hymenoptera in the diet of leptodactylids. These differences might be attributed to changes in the availability of resources in response to habitat modification. Although diet composition was very similar among species, niche overlap was larger than expected by chance, suggesting that the competition for food resources is not, or has not been, a significant force in determining the structure of this frog community. Two non-exclusive hypotheses could be considered as a justification for this result: 1 the high niche overlap could result from resource availability, which is sufficient to satisfy all species without any strong competition; 2 or the high values of niche overlap could be a selective force driving species to compete, but there has not been enough time to express a significant divergence in the species diet because the study area is characterised as a dynamic habitat influenced by frequent and cyclical changes.

  14. Call Transmission Efficiency in Native and Invasive Anurans: Competing Hypotheses of Divergence in Acoustic Signals

    Science.gov (United States)

    Llusia, Diego; Gómez, Miguel; Penna, Mario; Márquez, Rafael

    2013-01-01

    Invasive species are a leading cause of the current biodiversity decline, and hence examining the major traits favouring invasion is a key and long-standing goal of invasion biology. Despite the prominent role of the advertisement calls in sexual selection and reproduction, very little attention has been paid to the features of acoustic communication of invasive species in nonindigenous habitats and their potential impacts on native species. Here we compare for the first time the transmission efficiency of the advertisement calls of native and invasive species, searching for competitive advantages for acoustic communication and reproduction of introduced taxa, and providing insights into competing hypotheses in evolutionary divergence of acoustic signals: acoustic adaptation vs. morphological constraints. Using sound propagation experiments, we measured the attenuation rates of pure tones (0.2–5 kHz) and playback calls (Lithobates catesbeianus and Pelophylax perezi) across four distances (1, 2, 4, and 8 m) and over two substrates (water and soil) in seven Iberian localities. All factors considered (signal type, distance, substrate, and locality) affected transmission efficiency of acoustic signals, which was maximized with lower frequency sounds, shorter distances, and over water surface. Despite being broadcast in nonindigenous habitats, the advertisement calls of invasive L. catesbeianus were propagated more efficiently than those of the native species, in both aquatic and terrestrial substrates, and in most of the study sites. This implies absence of optimal relationship between native environments and propagation of acoustic signals in anurans, in contrast to what predicted by the acoustic adaptation hypothesis, and it might render these vertebrates particularly vulnerable to intrusion of invasive species producing low frequency signals, such as L. catesbeianus. Our findings suggest that mechanisms optimizing sound transmission in native habitat can play a

  15. Schema-based learning of adaptable and flexible prey- catching in anurans II. Learning after lesioning.

    Science.gov (United States)

    Corbacho, Fernando; Nishikawa, Kiisa C; Weerasuriya, Ananda; Liaw, Jim-Shih; Arbib, Michael A

    2005-12-01

    The previous companion paper describes the initial (seed) schema architecture that gives rise to the observed prey-catching behavior. In this second paper in the series we describe the fundamental adaptive processes required during learning after lesioning. Following bilateral transections of the hypoglossal nerve, anurans lunge toward mealworms with no accompanying tongue or jaw movement. Nevertheless anurans with permanent hypoglossal transections eventually learn to catch their prey by first learning to open their mouth again and then lunging their body further and increasing their head angle. In this paper we present a new learning framework, called schema-based learning (SBL). SBL emphasizes the importance of the current existent structure (schemas), that defines a functioning system, for the incremental and autonomous construction of ever more complex structure to achieve ever more complex levels of functioning. We may rephrase this statement into the language of Schema Theory (Arbib 1992, for a comprehensive review) as the learning of new schemas based on the stock of current schemas. SBL emphasizes a fundamental principle of organization called coherence maximization, that deals with the maximization of congruence between the results of an interaction (external or internal) and the expectations generated for that interaction. A central hypothesis consists of the existence of a hierarchy of predictive internal models (predictive schemas) all over the control center-brain-of the agent. Hence, we will include predictive models in the perceptual, sensorimotor, and motor components of the autonomous agent architecture. We will then show that predictive models are fundamental for structural learning. In particular we will show how a system can learn a new structural component (augment the overall network topology) after being lesioned in order to recover (or even improve) its original functionality. Learning after lesioning is a special case of structural

  16. Magnetic orientation of the Common Toad: establishing an arena approach for adult anurans

    Directory of Open Access Journals (Sweden)

    Gollmann Günter

    2011-03-01

    Full Text Available Abstract Background Magnetic orientation is a taxonomically widespread phenomenon in the animal kingdom, but has been little studied in anuran amphibians. We collected Common Toads (Bufo bufo during their migration towards their spawning pond and tested them shortly after displacement for possible magnetic orientation in arena experiments. Animals were tested in two different set-ups, in the geomagnetic field and in a reversed magnetic field. To the best of our knowledge, this is the first study testing orientation of adult anurans with a controlled magnetic field of a known strength and alignment. Results After displacement, toads oriented themselves unimodally under the geomagnetic field, following their former migration direction (d-axis. When the magnetic field was reversed, the distribution of bearings changed from a unimodal to a bimodal pattern, but still along the d-axis. The clustering of bearings was only significant after the toads reached the outer circle, 60.5 cm from their starting point. At a virtual inner circle (diameter 39 cm and at the start of the experiment, orientation of toads did not show any significant pattern. Conclusions The experimental set-up used in our study is suitable to test orientation behaviour of the Common Toad. We speculate that toads had not enough time to relocate their position on an internal map. Hence, they followed their former migration direction. Bimodality in orientation when exposed to the reversed magnetic field could be the result of a cue conflict, between magnetic and possibly celestial cues. For maintaining their migration direction toads use, at least partly, the geomagnetic field as a reference system.

  17. EEG recorded from the ear: Characterizing the ear-EEG method

    Directory of Open Access Journals (Sweden)

    Kaare Bjarke Mikkelsen

    2015-11-01

    Full Text Available A method for measuring electroencephalograms (EEG from the outer ear, so-called ear-EEG, has recently been proposed. The method could potentially enable robust recording of EEG in natural environments. The objective of this study was to substantiate the ear-EEG method by using a larger population of subjects and several paradigms. For rigour, we considered simultaneous scalp and ear-EEG recordings with common reference. More precisely, 32 conventional scalp electrodes and 12 ear electrodes allowed a thorough comparison between conventional and ear electrodes, testing several different placements of references.The paradigms probed of auditory onset response, mismatch negativity, auditory steady state response and alpha power attenuation.By comparing event related potential (ERP waveforms from the mismatch response paradigm, the signal measured from the ear electrodes was found to reflect the same cortical activity as that from nearby scalp electrodes. It was also found that referencing the ear-EEG electrodes to another within-ear electrode affects the time-domain recorded waveform (relative to scalp recordings, but not the timing of individual components. It was furthermore found that auditory steady state responses and alpha-band modulation were measured reliably with the ear-EEG modality. Finally, our findings showed that the auditory mismatch response was difficult to monitor with the ear-EEG. We conclude that ear-EEG yields similar performance as conventional EEG for spectrogram-based analysis, similar timing of ERP components, and equal signal strength for sources close to the ear. Ear-EEG can reliably measure activity from regions of the cortex which are located close to the ears, especially in paradigms employing frequency-domain analyses.

  18. Facial Nerve Paralysis in Patients With Chronic Ear Infections: Surgical Outcomes and Radiologic Analysis

    Science.gov (United States)

    Choi, Jin Woong

    2015-01-01

    Objectives The purpose of this study was to investigate the clinical features, radiologic findings, and treatment outcomes in patients of facial nerve paralysis with chronic ear infections. And we also aimed to evaluate for radiologic sensitivities on facial canal, labyrinth and cranial fossa dehiscences in middle ear cholesteatomas. Methods A total of 13 patients were enrolled in this study. Medical records were retrospectively reviewed for clinical features, radiologic findings, surgical findings, and recovery course. In addition, retrospective review of temporal bone computed tomography (CT) and operative records in 254 middle ear cholesteatoma patients were also performed. Results Of the 13 patients, eight had cholesteatomas in the middle ear, while two patients exhibited external auditory canal cholesteatomas. Chronic suppurative otitis media, petrous apex cholesteatoma and tuberculous otitis media were also observed in some patients. The prevalence of facial paralysis in middle ear cholesteatoma patients was 3.5%. The most common involved site of the facial nerve was the tympanic segment. Labyrinthine fistulas and destruction of cranial bases were more frequently observed in facial paralysis patients than nonfacial paralysis patients. The radiologic sensitivity for facial canal dehiscence was 91%. The surgical outcomes for facial paralysis were relatively satisfactory in all patients except in two patients who had petrous apex cholesteatoma and requiring conservative management. Conclusion Facial paralyses associated with chronic ear infections were observed in more advanced lesions and the surgical outcomes for facial paralysis were relatively satisfactory. Facial canal dehiscences can be anticipated preoperatively with high resolution CTs. PMID:26330915

  19. Middle ear structure in relation to function : the rat in middle ear research

    OpenAIRE

    Albiin, Nils

    1985-01-01

    The present study was undertaken to evaluate the rat as a model for middle ear re­search. The rat was chosen primarily because the gross structure of its middle ear shows several similarities to that of man. It was considered of great importance to make a thorough structural study of the rat middle ear and to compare the results with those reported for the human middle ear. The thesis therefore includes indepen­dent studies on various aspects of rat middle ear structure and function as well a...

  20. Objective Audiometry using Ear-EEG

    DEFF Research Database (Denmark)

    Christensen, Christian Bech; Kidmose, Preben

    life. Ear-EEG may therefore be an enabling technology for objective audiometry out of the clinic, allowing regularly fitting of the hearing aids to be made by the users in their everyday life environment. In this study we investigate the application of ear-EEG in objective audiometry....

  1. Bridging phenomenon - Simplifying complex ear reconstructions

    NARCIS (Netherlands)

    van Wingerden, Jan J.; Lapid, Oren; van der Horst, Chantal M. A. M.

    2014-01-01

    Extirpation of noninvasive skin tumors of the anterior ear may create large defects. Various flaps, described to cover these defects, demand special knowledge without which a loss of the fine detail of the ear may result. Healthy, exposed cartilage is deliberately excised leaving a basic framework

  2. INNER EAR EMBRYOGENESIS: GENETIC AND ENVIRONMENTAL DETERMINANTS

    Science.gov (United States)

    The anatomy and developmental molecular genetics of the inner ear from establishment of the otic placode to formation of the definitive cochlea and vestibular apparatus will be reviewed and the complex 3-D structural changes that shape the developing inner ear will be illustrated...

  3. Playing by Ear: Foundation or Frill?

    Science.gov (United States)

    Woody, Robert H.

    2012-01-01

    Many people divide musicians into two types: those who can read music and those who play by ear. Formal music education tends to place great emphasis on producing musically literate performers but devotes much less attention to teaching students to make music without notation. Some would suggest that playing by ear is a specialized skill that is…

  4. Why do elephants flap their ears?

    African Journals Online (AJOL)

    estimations. Reasons are advanced for believing that ear blood flow is controlled in the interests of thermoregulation. Behavioural fanning activity and the large ear surface area and surface to volume ratio suggest that this organ is of major. importance in thermoregulation under warm environmental conditions. s. Afr. J. Zool.

  5. [The infections of the ear].

    Science.gov (United States)

    Nowak, Catherine; Tanaka, Lei; Bobin, Serge; Nevoux, Jérôme

    2017-11-01

    In front of external otitis in spite of a well-conducted treatment, especially in immunodeficient patient, it is always necessary to look for an osteomyelitis of the skull base that requires an urgent parenteral antibiotic treatment of several weeks. Acute otitis media (AOM) is the most common bacterial infection of the child. In children under 2 years with purulent AOM, antibiotic therapy with amoxicilline is systematic for a period of 8-10 days. After 2 years of age and with mild symptoms of AOM, symptomatic treatment may be justified as first-line treatment. Chronic otitis media is frequent after an episode of AOM and becomes chronic only after 3 months of evolution. Grommets reduce the frequency of AOM episodes. All AOM complicated with meningitis requires monitoring by audiogram and MRI of the ear. Copyright © 2017 Elsevier Masson SAS. All rights reserved.

  6. Pica and the elephant's ear.

    Science.gov (United States)

    Mihailidou, Helen; Galanakis, Emmanouil; Paspalaki, Penelope; Borgia, Pelagia; Mantzouranis, Evangelia

    2002-11-01

    This is a case report of an otherwise healthy 2-year-old boy with a history of pica, associated with iron deficiency anemia. This boy was referred to our department for a neurologic evaluation because of an acute episode of sialorrhea, difficulty in speaking, dysphagia, and repeated swallowing movements. An uncertain episode of a brief-duration still gaze was also reported. In addition, the history revealed that the child had earlier ingested a leaf from a poisonous houseplant called Colocasia esculenta, also known as "elephant's ear." The habit of pica subsided after treatment with iron supplements. A 9-month follow-up period was uneventful. Neurologic manifestations can accompany accidental intoxications of some non-nutrient substances. Thus, pica must be suspected in children with acute behavior alterations.

  7. Microbiomes of the normal middle ear and ears with chronic otitis media.

    Science.gov (United States)

    Minami, Shujiro B; Mutai, Hideki; Suzuki, Tomoko; Horii, Arata; Oishi, Naoki; Wasano, Koichiro; Katsura, Motoyasu; Tanaka, Fujinobu; Takiguchi, Tetsuya; Fujii, Masato; Kaga, Kimitaka

    2017-10-01

    The aim of this study was to profile and compare the middle ear microbiomes of human subjects with and without chronic otitis media. Prospective multicenter cohort study. All consecutive patients undergoing tympanoplasty surgery for chronic otitis media or ear surgery for conditions other than otitis media were recruited. Sterile swab samples were collected from the middle ear mucosa during surgery. The variable region 4 of the 16S rRNA gene in each sample were amplified using region-specific primers adapted for the Illumina MiSeq sequencer (Illumina, CA, USA)). The sequences were subjected to local blast and classified using Metagenome@KIN (World Fusion, Tokyo, Japan). In total, 155 participants were recruited from seven medical centers. Of these, 88 and 67 had chronic otitis media and normal middle ears, respectively. The most abundant bacterial phyla on the mucosal surfaces of the normal middle ears were Proteobacteria, followed by Actinobacteria, Firmicutes, and Bacteroidetes. The children and adults with normal middle ears differed significantly in terms of middle ear microbiomes. Subjects with chronic otitis media without active inflammation (dry ear) had similar middle ear microbiomes as the normal middle ears group. Subjects with chronic otitis media with active inflammation (wet ear) had a lower prevalence of Proteobacteria and a higher prevalence of Firmicutes than the normal middle ears. The human middle ear is inhabited by more diverse microbial communities than was previously thought. Alteration of the middle ear microbiome may contribute to the pathogenesis of chronic otitis media with active inflammation. 2b. Laryngoscope, 127:E371-E377, 2017. © 2017 The American Laryngological, Rhinological and Otological Society, Inc.

  8. 22 CFR 1423.28 - Briefs in support of exceptions; oppositions to exceptions; cross-exceptions.

    Science.gov (United States)

    2010-04-01

    ... 22 Foreign Relations 2 2010-04-01 2010-04-01 true Briefs in support of exceptions; oppositions to exceptions; cross-exceptions. 1423.28 Section 1423.28 Foreign Relations FOREIGN SERVICE LABOR RELATIONS BOARD... FOREIGN SERVICE IMPASSE DISPUTES PANEL FOREIGN SERVICE LABOR RELATIONS BOARD AND GENERAL COUNSEL OF THE...

  9. Quantifying the Road-Effect Zone: Threshold Effects of a Motorway on Anuran Populations in Ontario, Canada

    Directory of Open Access Journals (Sweden)

    Felix Eigenbrod

    2009-06-01

    Full Text Available The negative effect of roads on wildlife is recognized as a major contributor to the global biodiversity crisis, with anurans being among the most vulnerable groups overall. The "road-effect zone," i.e., the extent of significant ecological effects from the edge of a road (Forman and Alexander 1998, has important management implications, but has never been quantified for anurans. In the first study of its kind, we measured the extent and type of relationship underlying the road-effect zones of a motorway with a high proportion of heavy-truck traffic, particularly at night (Highway 401 for anuran species richness and relative abundance. We surveyed 34 ponds located 68-3262 m from the edge of the motorway, and used piecewise and linear regressions to determine if road-effect zones were clearly delineated by ecological thresholds. We found road-effect zones of 250-1000 m delineated by ecological thresholds for four of seven species and species richness, and road-effect zones of well beyond 1000 m best described by linear regressions for two species. The negative effect of Highway 401 was unexpectedly strong for four of seven species suggest that, in addition to road mortality, very high nighttime truck traffic can actually lead to reduced use of breeding habitat near the motorway either by acting as a barrier to forest habitat on the other side of the highway and/or because of traffic noise. Our results show that most anurans are likely to have reduced abundances near motorways, but that both the extent of the effect of this type of road and the underlying relationship vary considerably between species. Furthermore, the noise and/or barrier effect of very high nighttime traffic volumes can lead to negative effects of motorways even on species that are relatively unaffected by direct road mortality.

  10. [A report of two familial cases of Michel syndrome (bilateral agenesis of the inner ear)].

    Science.gov (United States)

    Ghazli, K; Merite-Drancy, A; Marsot-Dupuch, K; Meyer, B; Jeunesse, Y; Chouard, C H

    1998-02-01

    In two siblings, wearing conventional hearing aid, presenting profound but not total congenital deafness, with no particular antecedents, the imaging destined to confirm the indication of a cochlear implant revealed a total bilateral agenesis of the inner ear. In one of the children, this imaging was confirmed by an exploration of the middle ear performed during a tonsillectomy that was otherwise necessary. We will summarize the literature concerning Michel's Disease, exceptional in its princeps form, and we will discuss the manner of action of conventional devices in these cases which are a priori without any sensorial element.

  11. In vivo efficacy of anuran trypsin inhibitory peptides against staphylococcal skin infection and the impact of peptide cyclization.

    Science.gov (United States)

    Malik, U; Silva, O N; Fensterseifer, I C M; Chan, L Y; Clark, R J; Franco, O L; Daly, N L; Craik, D J

    2015-04-01

    Staphylococcus aureus is a virulent pathogen that is responsible for a wide range of superficial and invasive infections. Its resistance to existing antimicrobial drugs is a global problem, and the development of novel antimicrobial agents is crucial. Antimicrobial peptides from natural resources offer potential as new treatments against staphylococcal infections. In the current study, we have examined the antimicrobial properties of peptides isolated from anuran skin secretions and cyclized synthetic analogues of these peptides. The structures of the peptides were elucidated by nuclear magnetic resonance (NMR) spectroscopy, revealing high structural and sequence similarity with each other and with sunflower trypsin inhibitor 1 (SFTI-1). SFTI-1 is an ultrastable cyclic peptide isolated from sunflower seeds that has subnanomolar trypsin inhibitory activity, and this scaffold offers pharmaceutically relevant characteristics. The five anuran peptides were nonhemolytic and noncytotoxic and had trypsin inhibitory activities similar to that of SFTI-1. They demonstrated weak in vitro inhibitory activities against S. aureus, but several had strong antibacterial activities against S. aureus in an in vivo murine wound infection model. pYR, an immunomodulatory peptide from Rana sevosa, was the most potent, with complete bacterial clearance at 3 mg · kg(-1). Cyclization of the peptides improved their stability but was associated with a concomitant decrease in antimicrobial activity. In summary, these anuran peptides are promising as novel therapeutic agents for treating infections from a clinically resistant pathogen. Copyright © 2015, American Society for Microbiology. All Rights Reserved.

  12. Localization of antileukoprotease in middle ear mucosa.

    Science.gov (United States)

    Carlsson, B; Ohlsson, K

    1983-01-01

    The localization of antileukoprotease was studied immunohistologically in normal middle ear mucosa specimens obtained at autopsy and in chronically inflamed middle ear mucosa specimens obtained at middle ear surgery for chronic otitis media. In the sections of normal as well as in the sections of chronically inflamed middle ear mucosa, antileukoprotease localization was confined to PAS-positive goblet cells of surface epithelium and to PAS-positive goblet-like cells of submucosal glands and crypts, whereas ciliated mucosal cells and stratified squamous epithelial cells were devoid of anti-leukoprotease. In comparison with normal middle ear mucosa, an increased number of goblet cells--and thus an increased number of cells containing antileukoprotease--was present in the chronically inflamed middle ear mucosa. Since antileukoprotease is a potent inhibitor of granulocyte elastase and Cathepsin G, it was concluded that this proliferation of the respiratory epithelium during inflammatory processes in the middle ear indicates an increased activity of the biologic defence system against the action of granulocyte proteases.

  13. The Ear-Brain Connection: Older Ears and Older Brains.

    Science.gov (United States)

    Tremblay, Kelly L

    2015-06-01

    The purpose of this article is to review recent research from our laboratory on the topic of aging, and the ear-brain system, as it relates to hearing aid use and auditory rehabilitation. The material described here was presented as part of the forum on the brain and hearing aids, at the 2014 HEaling Across the Lifespan (HEAL) conference. The method involves a narrative review of previously reported electroencephalography (EEG) and magnetoencephalography (MEG) data from our laboratory as they relate to the (a) neural detection of amplified sound and (b) ability to learn new sound contrasts. Results from our studies add to the mounting evidence that there are central effects of biological aging as well as peripheral pathology that affect a person's neural detection and use of sound. What is more, these biological effects can be seen as early as middle age. The accruing evidence has implications for hearing aid use because effective communication relies not only on sufficient detection of sound but also on the individual's ability to learn to make use of these sounds in ever-changing listening environments.

  14. The kinematic determinants of anuran swimming performance: an inverse and forward dynamics approach.

    Science.gov (United States)

    Richards, Christopher T

    2008-10-01

    The aims of this study were to explore the hydrodynamic mechanism of Xenopus laevis swimming and to describe how hind limb kinematics shift to control swimming performance. Kinematics of the joints, feet and body were obtained from high speed video of X. laevis frogs (N=4) during swimming over a range of speeds. A blade element approach was used to estimate thrust produced by both translational and rotational components of foot velocity. Peak thrust from the feet ranged from 0.09 to 0.69 N across speeds ranging from 0.28 to 1.2 m s(-1). Among 23 swimming strokes, net thrust impulse from rotational foot motion was significantly higher than net translational thrust impulse, ranging from 6.1 to 29.3 N ms, compared with a range of -7.0 to 4.1 N ms from foot translation. Additionally, X. laevis kinematics were used as a basis for a forward dynamic anuran swimming model. Input joint kinematics were modulated to independently vary the magnitudes of foot translational and rotational velocity. Simulations predicted that maximum swimming velocity (among all of the kinematics patterns tested) requires that maximal translational and maximal rotational foot velocity act in phase. However, consistent with experimental kinematics, translational and rotational motion contributed unequally to total thrust. The simulation powered purely by foot translation reached a lower peak stroke velocity than the pure rotational case (0.38 vs 0.54 m s(-1)). In all simulations, thrust from the foot was positive for the first half of the power stroke, but negative for the second half. Pure translational foot motion caused greater negative thrust (70% of peak positive thrust) compared with pure rotational simulation (35% peak positive thrust) suggesting that translational motion is propulsive only in the early stages of joint extension. Later in the power stroke, thrust produced by foot rotation overcomes negative thrust (due to translation). Hydrodynamic analysis from X. laevis as well as forward

  15. Relative toxicity of the components of the original formulation of Roundup to five North American anurans.

    Science.gov (United States)

    Moore, Lindsay J; Fuentes, Latice; Rodgers, John H; Bowerman, William W; Yarrow, Greg K; Chao, Wayne Y; Bridges, William C

    2012-04-01

    The responses of five North American frog species that were exposed in an aqueous system to the original formulation of Roundup were compared. Carefully designed and un-confounded laboratory toxicity tests are crucial for accurate assessment of potential risks from the original formulation of Roundup to North American amphibians in aquatic environments. The formulated mixture of this herbicide as well as its components, isopropylamine (IPA) salt of glyphosate and the surfactant MON 0818 (containing polyethoxylated tallowamine (POEA)) were separately tested in 96 h acute toxicity tests with Gosner stage 25 larval anurans. Rana pipiens, R. clamitans, R. catesbeiana, Bufo fowleri, and Hyla chrysoscelis were reared from egg masses and exposed to a series of 11 concentrations of the original formulation of Roundup herbicide, nine concentrations of MON 0818 and three concentrations of IPA salt of glyphosate in static (non-renewal) aqueous laboratory tests. LC50 values are expressed as glyphosate acid equivalents (ae) or as mg/L for MON 0818 concentrations for comparison between the formulation and components. R. pipiens was the most sensitive of five species with 96 h-LC50 values for formulation tests, for the five species, ranging from 1.80 to 4.22 mg ae/L, and MON 0818 exposures with 96 h-LC50 values ranging from 0.68 to 1.32 mg/L. No significant mortality was observed during exposures of 96 h for any of the five species exposed to glyphosate IPA salt at concentrations up to 100 times the predicted environmental concentration (PEC). These results agree with previous studies which have noted that the surfactant MON 0818 containing POEA contributes the majority of the toxicity to the herbicide formulations for fish, aquatic invertebrates, and amphibians. These study results suggest that anurans are among the most sensitive species, and emphasize the importance of testing the herbicide formulation in addition to its separate components to accurately characterize the

  16. Trends in Modern Exception Handling

    Directory of Open Access Journals (Sweden)

    Marcin Kuta

    2003-01-01

    Full Text Available Exception handling is nowadays a necessary component of error proof information systems. The paper presents overview of techniques and models of exception handling, problems connected with them and potential solutions. The aspects of implementation of propagation mechanisms and exception handling, their effect on semantics and general program efficiency are also taken into account. Presented mechanisms were adopted to modern programming languages. Considering design area, formal methods and formal verification of program properties we can notice exception handling mechanisms are weakly present what makes a field for future research.

  17. Imaging of the postoperative middle ear

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Marc T. [Department of Medical Imaging, Fondation Ophtalmologique Adolphe de Rothschild, 25 rue Manin, 75940, Paris (France); Ayache, Denis [Department of Otorhinolaryngology, Fondation Ophtalmologique Adolphe de Rothschild, Paris (France)

    2004-03-01

    The aim of this article is twofold: (a) to present the principles and the indications of surgical treatment of middle ear pathologies; and (b) to review the imaging findings after middle ear surgery, including the normal postoperative aspects and imaging findings in patients presenting with unsatisfactory surgical results or with suspicion of postoperative complications. This review is intentionally restricted to the most common diseases involving the middle ear: chronic otitis media and otosclerosis. In these specific fields of interest, CT and MR imaging play a very important role in the postoperative follow-up and in the work-up of surgical failures and complications. (orig.)

  18. 75 FR 28306 - Excepted Service

    Science.gov (United States)

    2010-05-20

    ... MANAGEMENT Excepted Service AGENCY: U.S. Office of Personnel Management (OPM). ACTION: Notice. SUMMARY: This... excepted service as required by 5 CFR 213.103. FOR FURTHER INFORMATION CONTACT: Roland Edwards, Senior Executive Resource Services, Employee Services, 202-606-2246. SUPPLEMENTARY INFORMATION: Appearing in the...

  19. 75 FR 3947 - Excepted Service

    Science.gov (United States)

    2010-01-25

    ... MANAGEMENT Excepted Service AGENCY: U.S. Office of Personnel Management (OPM). ACTION: Notice. SUMMARY: This... excepted service as required by 5 CFR 213.103. FOR FURTHER INFORMATION CONTACT: Roland Edwards, Senior Executive Resource Services, Employee Services, 202-606-2246. SUPPLEMENTARY INFORMATION: Appearing in the...

  20. Diode Laser Ear Piercing: A Novel Technique.

    Science.gov (United States)

    Suseela, Bibilash Babu; Babu, Preethitha; Chittoria, Ravi Kumar; Mohapatra, Devi Prasad

    2016-01-01

    Earlobe piercing is a common office room procedure done by a plastic surgeon. Various methods of ear piercing have been described. In this article, we describe a novel method of laser ear piercing using the diode laser. An 18-year-old female patient underwent an ear piercing using a diode laser with a power of 2.0 W in continuous mode after topical local anaesthetic and pre-cooling. The diode laser was fast, safe, easy to use and highly effective way of ear piercing. The advantages we noticed while using the diode laser over conventional methods were more precision, minimal trauma with less chances of hypertrophy and keloids, no bleeding with coagulation effect of laser, less time taken compared to conventional method and less chance of infection due to thermal heat effect of laser.

  1. Structural Metadata Research in the Ears Program

    National Research Council Canada - National Science Library

    Liu, Yang; Shriberg, Elizabeth; Stolcke, Andreas; Peskin, Barbara; Ang, Jeremy; Hillard, Dustin; Ostendorf, Mari; Tomalin, Marcus; Woodland, Phil; Harper, Mary

    2005-01-01

    Both human and automatic processing of speech require recognition of more than just words. In this paper we provide a brief overview of research on structural metadata extraction in the DARPA EARS rich transcription program...

  2. Environment for Auditory Research Facility (EAR)

    Data.gov (United States)

    Federal Laboratory Consortium — EAR is an auditory perception and communication research center enabling state-of-the-art simulation of various indoor and outdoor acoustic environments. The heart...

  3. Mast cells and middle ear effusion.

    Science.gov (United States)

    Stenfors, L E; Albiin, N; Bloom, G D; Hellström, S; Widemar, L

    1985-01-01

    The mast cell--an important component of connective tissue--carries in its cytoplasmic granules various biologically active substances, such as heparin, histamine, and a broad spectrum of enzymes. This cell type plays a prominent role in inflammatory and allergic conditions. In the middle ear, the mast cells are mainly localized in the pars flaccida of the tympanic membrane and beneath the tracts of secretory and ciliated cells in the middle ear mucosa. Degranulation of the mast cells by the histamine liberator compound 48/80 causes histamine-rich effusion material to accumulate in the middle ear. Plugging of the eustachian tube and/or tympanic isthmus will bring about a similar accumulation. It would thus seem that mast cells in some way participate in the production of middle ear effusion, probably via their potent mediators.

  4. Mozart ear: diagnosis, treatment, and literature review.

    Science.gov (United States)

    Yamashita, Ken; Yotsuyanagi, Takatoshi; Saito, Tamotsu; Isogai, Noritaka; Mori, Hiromasa; Itani, Yoshihito

    2011-11-01

    Mozart ear is a congenital auricular deformity, which is mainly characterized by a bulging appearance of the anterosuperior portion of the auricle, a convexly protruded cavum conchae, and a slit-like narrowing of the orifice of the external auditory meatus. It is said to be uncommon, and because no one has yet fully described neither the disease nor the treatment, the concept of Mozart ear has not been unified. This report describes a case of a 13-year-old girl presented with an unusual congenital deformity which showed the features of Mozart ear. It is an extremely rare deformity that only about 4 clinical cases have been reported in medical literature thereby a treatment method has not been fully discussed. For surgical correction of our cases, we excised deformed conchal cartilage, turned it over, regrafted, and maintained a cosmetically positive result. We also reviewed and described the origin, current concept, and treatment method of Mozart ear.

  5. Occurrence of Batrachochytrium dendrobatidis in anurans of the Mediterranean region of Baja California, México

    Science.gov (United States)

    Peralta-Garcia, Anny; Adams, Andrea J; Briggs, Cheryl J.; Galina-Tessaro, Patricia; Valdez-Villavicencio, Jorge H.; Hollingsworth, Bradford; Shaffer, H. Bradley; Fisher, Robert N.

    2018-01-01

     Chytridiomycosis is caused by the fungal pathogen Batrachochytrium dendrobatidis (Bd) and is regarded as one of the most significant threats to global amphibian populations. In México, Bd was first reported in 2003 and has now been documented in 13 states. We visited 33 localities and swabbed 199 wild-caught anurans from 7 species (5 native, 2 exotic) across the Mediterranean region of the state of Baja California. Using quantitative PCR, Bd was detected in 94 individuals (47.2% of samples) at 25 of the 33 survey localities for 5 native and 1 exotic frog species. The exotic Xenopus laevis was the only species that tested completely negative for Bd. We found that remoteness, distance to agricultural land, and elevation were the best predictors of Bd presence. These are the first Bd-positive results for the state of Baja California and its presence should be regarded as an additional conservation threat to the region’s native frog species. 

  6. Bioaccumulation of Heavy Metals in Anuran Tadpoles: A Study in Barak Valley, Assam

    Directory of Open Access Journals (Sweden)

    Pammi Singh

    2016-07-01

    Full Text Available Heavy metal pollution plays an important role in global biodiversity decline. However, there is paucity of information concerning the effects of metals on amphibians. In the present study, investigations were made on the accumulation of heavy metals, copper (Cu and lead (Pb in water, sediment and tadpoles inhabiting the water bodies of Barak Valley, Assam. Tadpoles of six different anuran species, Hoplobatrachus tigerinus, Leptobrachium smithi, Clinotarsus alticola, Fejarvarya sp., Sylvirana leptoglossa and Euphlyctis cyanophlyctis were selected for this purpose. Heavy metal concentrations were determined in intestine, liver and tail of tadpole samples of these species. The results revealed that the copper concentration in water samples was within the maximum permissible limit of WHO (2 mg L-1, but the concentration of lead in water samples increased beyond the permissible limit of WHO (0.01 mg L-1 resulting in possibilities of higher accumulation of the metal in tadpoles and decline of amphibians’ population. Total concentration of Cu in the tadpoles of different species of amphibians followed the order: H. tigerinus > S. leptoglossa > E. cyanophlyctis > C. alticola > Fejarvarya sp. > L. smithi, while concentration of lead followed the order: E. cyanophlyctis > C. alticola > S. leptoglossa > Fejarvarya sp.> H. tigerinus > L. smithi.

  7. White-throated sparrows alter songs differentially in response to chorusing anurans and other background noise.

    Science.gov (United States)

    Lenske, Ariel K; La, Van T

    2014-06-01

    Animals can use acoustic signals to attract mates and defend territories. As a consequence, background noise that interferes with signal transmission has the potential to reduce fitness, especially in birds that rely on song. While much research on bird song has investigated vocal flexibility in response to urban noise, weather and other birds, the possibility of inter-class acoustic competition from anurans has not been previously studied. Using sound recordings from central Ontario wetlands, we tested if white-throated sparrows (Zonotrichia albicolis) make short-term changes to their singing behaviour in response to chorusing spring peepers (Pseudacris crucifer), as well as to car noise, wind and other bird vocalizations. White-throated sparrow songs that were sung during the spring peeper chorus were shorter with higher minimum frequencies and narrower bandwidths resulting in reduced frequency overlap. Additionally, sparrows were less likely to sing when car noise and the vocalizations of other birds were present. These patterns suggest that birds use multiple adjustment strategies. This is the first report to demonstrate that birds may alter their songs differentially in response to different sources of noise. This article is part of a Special Issue entitled: insert SI title. Copyright © 2014 Elsevier B.V. All rights reserved.

  8. A three-parameter model for classifying anurans into four genera based on advertisement calls.

    Science.gov (United States)

    Gingras, Bruno; Fitch, William Tecumseh

    2013-01-01

    The vocalizations of anurans are innate in structure and may therefore contain indicators of phylogenetic history. Thus, advertisement calls of species which are more closely related phylogenetically are predicted to be more similar than those of distant species. This hypothesis was evaluated by comparing several widely used machine-learning algorithms. Recordings of advertisement calls from 142 species belonging to four genera were analyzed. A logistic regression model, using mean values for dominant frequency, coefficient of variation of root-mean square energy, and spectral flux, correctly classified advertisement calls with regard to genus with an accuracy above 70%. Similar accuracy rates were obtained using these parameters with a support vector machine model, a K-nearest neighbor algorithm, and a multivariate Gaussian distribution classifier, whereas a Gaussian mixture model performed slightly worse. In contrast, models based on mel-frequency cepstral coefficients did not fare as well. Comparable accuracy levels were obtained on out-of-sample recordings from 52 of the 142 original species. The results suggest that a combination of low-level acoustic attributes is sufficient to discriminate efficiently between the vocalizations of these four genera, thus supporting the initial premise and validating the use of high-throughput algorithms on animal vocalizations to evaluate phylogenetic hypotheses.

  9. Species richness and structure of an anuran community in an Atlantic Forest site in southern Brazil

    Directory of Open Access Journals (Sweden)

    Adriele Karlokoski Cunha

    2010-06-01

    Full Text Available The species richness and spatial distribution of an anuran community were studied over 12 months in an Atlantic Forest area in São José dos Pinhais Municipality, Paraná State, southern Brazil. During field surveys, we registered 32 species from ten families: Brachycephalidae (2, Bufonidae (2, Centrolenidae (1, Cycloramphidae (1, Hemiphractidae (1, Hylidae (18, Hylodidae (1, Leiuperidae (2, Leptodactylidae (3, and Microhylidae (1. Sixteen species were registered in open areas, while seventeen species were found on forest borders and twenty species in forest areas. In relation to the microhabitat utilization, species were registered according to stratum of vocalization: 1 on the ground (eight; 2 in the water (two; 3 in the lower stratum (eleven; 4 in the intermediate stratum (five; 5 in the upper stratum (four. Five species were abundant (15.6%, while twelve were common (37.5%, and fifteen were considered rare (46.9%. The biological aspects of the majority of the species described in this work as related to forest areas are not well known. This fact reinforces the importance of Atlantic Forest conservation.

  10. Anuran community composition along two large rivers in a tropical disturbed landscape

    Directory of Open Access Journals (Sweden)

    Mauricio Almeida-Gomes

    2015-02-01

    Full Text Available In this study we evaluated how anuran species were distributed in riparian habitats along two large rivers. Sampling was carried out between January and March 2012 in the municipality of Cachoeiras de Macacu, state of Rio de Janeiro. We delimited 20 plots along each river, ten in portions inside the forest of the Reserva Ecológica de Guapiaçu (REGUA, and with comparatively greater amount of forest cover, and ten outside REGUA, with comparatively lesser forest cover surrounding the rivers. We recorded 70 individuals from 14 frog species in the Manoel Alexandre River and 63 individuals from 15 frog species in the Guapiaçu River. The most abundant species in both rivers was Cycloramphus brasiliensis (Steindachner, 1864, and it was more abundant in sections with greater amount of forest cover. This information, coupled with the occurrence of species that are more adapted to open and more disturbed habitats in river sections that harbor lesser riparian vegetation, help to explain differences in amphibian species composition between river sections with greater and lesser forest cover. The results of our study highlight the importance of preserving riparian vegetation associated with rivers in the Atlantic Forest for the conservation of amphibians.

  11. Landing in basal frogs: evidence of saltational patterns in the evolution of anuran locomotion

    Science.gov (United States)

    Essner, Richard L.; Suffian, Daniel J.; Bishop, Phillip J.; Reilly, Stephen M.

    2010-10-01

    All frogs are assumed to jump in a similar manner by rapidly extending hindlimbs during the propulsive phase and rotating the limbs forward during flight in order to land forelimbs first. However, studies of jumping behavior are lacking in the most primitive living frogs of the family Leiopelmatidae. These semi-aquatic or terrestrial anurans retain a suite of plesiomorphic morphological features and are unique in using an asynchronous (trot-like) rather than synchronous “frog-kick” swimming gait of other frogs. We compared jumping behavior in leiopelmatids to more derived frogs and found that leiopelmatids maintain extended hindlimbs throughout flight and landing phases and do not land on adducted forelimbs. These “belly-flop” landings limit the ability for repeated jumps and are consistent with a riparian origin of jumping in frogs. The unique behavior of leiopelmatids shows that frogs evolved jumping before they perfected landing. Moreover, an inability to rapidly cycle the limbs may provide a functional explanation for the absence of synchronous swimming in leiopelmatids.

  12. Diets of three species of anurans from the cache creek watershed, California, USA

    Science.gov (United States)

    Hothem, R.L.; Meckstroth, A.M.; Wegner, K.E.; Jennings, M.R.; Crayon, J.J.

    2009-01-01

    We evaluated the diets of three sympatric anuran species, the native Northern Pacific Treefrog, Pseudacris regilla, and Foothill Yellow-Legged Frog, Rana boylii, and the introduced American Bullfrog, Lithobates catesbeianus, based on stomach contents of frogs collected at 36 sites in 1997 and 1998. This investigation was part of a study of mercury bioaccumulation in the biota of the Cache Creek Watershed in north-central California, an area affected by mercury contamination from natural sources and abandoned mercury mines. We collected R. boylii at 22 sites, L. catesbeianus at 21 sites, and P. regilla at 13 sites. We collected both L. catesbeianus and R. boylii at nine sites and all three species at five sites. Pseudacris regilla had the least aquatic diet (100% of the samples had terrestrial prey vs. 5% with aquatic prey), followed by R. boylii (98% terrestrial, 28% aquatic), and L. catesbeianus, which had similar percentages of terrestrial (81%) and aquatic prey (74%). Observed predation by L. catesbeianus on R. boylii may indicate that interaction between these two species is significant. Based on their widespread abundance and their preference for aquatic foods, we suggest that, where present, L. catesbeianus should be the species of choice for all lethal biomonitoring of mercury in amphibians. Copyright ?? 2009 Society for the Study of Amphibians and Reptiles.

  13. Embryonic learning and developmental carry-over effects in an invasive anuran.

    Science.gov (United States)

    Garcia, Tiffany S; Urbina, Jenny C; Bredeweg, Evan M; Ferrari, Maud C O

    2017-07-01

    Carry-over effects influence trait responses in later life stages as a result of early experience with environmental cues. Predation risk is an influential stressor and selection exists for early recognition of threats. In particular, invasive species may benefit from carry-over effects by preemptively recognizing and responding to novel predators via latent developmental changes and embryonic learning. In a factorial experiment, we conditioned invasive American bullfrog embryos (Lithobates catesbeianus) to the odor of a novel fish predator, largemouth bass (Micropterus salmoides) alone or in combination with injured conspecific cues. We quantified developmental carryover in the larval life stage and found that individuals conditioned to the highest risk (fish and injured conspecific cues) grew into longer bodied larvae relative to larvae from lower risk treatments. We also assessed embryonic learning, a behavioral carry-over effect, and found an interaction between embryonic conditioning and larval exposure. Behavioral responses were only found in scenarios when predation risk varied in intensity across life history stages, thus requiring a more flexible antipredator strategy. This indicates a potential trade-off between the two strategies in larval growth and development rates, and time until metamorphosis. Our results suggest that early predator exposure and carry-over effects have significant impacts on life history trajectories for American bullfrogs. This research contributes to our understanding of a potentially important invasion mechanism in an anuran species of conservation concern.

  14. Endemic Asian chytrid strain infection in threatened and endemic anurans of the Northern Western Ghats, India.

    Directory of Open Access Journals (Sweden)

    Neelesh Dahanukar

    Full Text Available The Western Ghats of India harbors a rich diversity of amphibians with more than 77% species endemic to this region. At least 42% of the endemic species are threatened due to several anthropogenic stressors. However, information on amphibian diseases and their impacts on amphibian populations in this region are scarce. We report the occurrence of Batrachochytridium dendrobatidis (Bd, an epidermal aquatic fungal pathogen that causes chytridiomycosis in amphibians, from the Western Ghats. In the current study we detected the occurrence of a native Asian Bd strain from three endemic and threatened species of anurans, Bombay Night Frog Nyctibatrachus humayuni, Leith's Leaping Frog Indirana leithii and Bombay Bubble Nest Frog Raorchestes bombayensis, for the first time from the northern Western Ghats of India based on diagnostic nested PCR, quantitative PCR, DNA sequencing and histopathology. While, the Bd infected I. leithii and R. bombayensis did not show any external symptoms, N. humayuni showed lesions on the skin, browning of skin and sloughing. Sequencing of Bd 5.8S ribosomal RNA gene, and the ITS1 and ITS2 regions, revealed that the current Bd strain is related to a haplotype endemic to Asia. Our findings confirm the presence of Bd in northern Western Ghats and the affected amphibians may or may not show detectable clinical symptoms. We suggest that the significance of diseases as potential threat to amphibian populations of the Western Ghats needs to be highlighted from the conservation point of view.

  15. Potential component Allee effects and their impact on wetland management in the conservation of endangered anurans.

    Directory of Open Access Journals (Sweden)

    Michele A Gaston

    Full Text Available Effective management of wetland quantity and quality is crucial for effective conservation of declining amphibian populations. In particular, frogs and toads that employ aggregative breeding strategies may suffer negative population impacts in response to changes in availability of aquatic breeding habitat, including overabundance of suitable habitat, if density of conspecifics attending aggregations is positively correlated with reproductive success. Here we document such a positive relationship, potentially the first example of a component Allee effect in an anuran, in the critically endangered Houston toad (Bufo houstonensis. We assessed the relationship between mean yearly chorus size and reproductive success of males at the pond level using an information theoretic model selection approach and a two-sample t-test. The chosen model contained the single variable of mean yearly chorus size to predict probability of reproduction, as selected using the Akaike Information Criterion corrected for small sample size and Akaike weight. Mean chorus sizes were significantly higher among ponds exhibiting evidence of reproduction than in those that showed no evidence of reproduction. Our results suggest that chorusing alone is a poor proxy for inference of population stability and highlight a need for reassessment of widely-used amphibian monitoring protocols. Further, amphibian conservation efforts should account for potential Allee effects in order to optimize benefits and avoid underestimating critical population thresholds, particularly in species exhibiting rapid population declines.

  16. Niche partitioning and the role of intraspecific niche variation in structuring a guild of generalist anurans.

    Science.gov (United States)

    Cloyed, Carl S; Eason, Perri K

    2017-03-01

    Intra-population niche differences in generalist foragers have captured the interest of ecologists, because such individuality can have important ecological and evolutionary implications. Few researchers have investigated how these differences affect the relationships among ecologically similar, sympatric species. Using stable isotopes, stomach contents, morphology and habitat preference, we examined niche partitioning within a group of five anurans and determined whether variation within species could facilitate resource partitioning. Species partitioned their niches by trophic level and by foraging habitat. However, there was considerable intraspecific variation in trophic level, with larger individuals generally feeding at higher trophic levels. For species at intermediate trophic levels, smaller individuals overlapped in trophic level with individuals of smaller species and larger individuals overlapped with the smallest individuals from larger species. Species varied in carbon isotopes; species with enriched carbon isotope ratios foraged farther from ponds, whereas species with depleted carbon isotope values foraged closer to ponds. Our study shows that these species partition their niches by feeding at different trophic levels and foraging at different distances from ponds. The intraspecific variation in trophic level decreased the number of individuals from each species that overlapped in trophic level with individuals from other species, which can facilitate species coexistence.

  17. Osteoma of the middle ear: case report

    Energy Technology Data Exchange (ETDEWEB)

    Ryu, Ji Hwa [College of Medicine, Inje University, Dongrae Paik Hospital, Busan (Korea, Republic of)

    2005-07-15

    Osteomas of the middle ear are exceedingly rare benign neoplasms. To date, only 21 cases have been reported in the literature. They arise from the promontory, the pyramidal process and the ossicles, and they are usually asymptomatic or cause some conductive hearing loss. We report here the CT and pathologic findings in a 38-year-old woman with a benign osteoma of the middle ear along with chronic otitis media.

  18. Commissioning of n_TOF EAR2

    CERN Multimedia

    The construction of the second beam line and experiment area (EAR2) of the n_TOF facility is currently ongoing and scheduled to be completed by July 2014. An extensive series of measurements is planned in order to determine the beam characteristics like the neutron flux, the spatial beam profile and the resolution function, as well as the response of several detectors considered for use in future measurements at EAR2. A rigorous study of backgrounds will be undertaken in various conditions.

  19. 21 CFR 874.3430 - Middle ear mold.

    Science.gov (United States)

    2010-04-01

    .... A middle ear mold is made of materials such as polyamide, polytetrafluoroethylene, silicone... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Middle ear mold. 874.3430 Section 874.3430 Food... DEVICES EAR, NOSE, AND THROAT DEVICES Prosthetic Devices § 874.3430 Middle ear mold. (a) Identification. A...

  20. The morphology of the inner ear from the domestic pig (Sus scrofa).

    Science.gov (United States)

    Lovell, J M; Harper, G M

    2007-12-01

    The morphology of the hair cells of the inner ear end organs from the domestic pig (Sus scrofa) have been studied using a combination of Scanning and Transmission Electron Microscopy (SEM and TEM), revealing hair cells from the cochlea and vestibule using a novel surgical and technical approach. This is the first time that the inner ear hair cells from S. scrofa have been studied, thus providing useful anatomical information on the morphology of the hair cells from the cochlea, saccule and utricle from a large mammal. Anatomical information in relation to the morphology of the inner ear is of considerable importance, both in the pathological diagnosis of trauma and in the development of cochlea implants and other biotechnological systems associated with the enhancement of hearing. Standard fixation protocols using cardiac perfusion was not employed in this study as this method cannot always be applied, such as the pathological examination of the human ear, or the study of animals protected by endangered species legislation. With the exception of a very few countries, cetaceans cannot be killed for research purposes, yet physiological information on the inner ear from these species is urgently required for ecological assessment reasons. Supporting the use of S. scrofa as a model for cetacean hearing research is that this animal is a member of the order Artiodactyla, which includes both the hippopotamus and cetaceans. Being of a similar size, the pig is an ideal subject for developing protocols and surgical techniques required to investigate both the human and small cetacean auditory systems.

  1. Variation in salinity tolerance among larval anurans: implications for community composition and the spread of an invasive, non-native species

    Science.gov (United States)

    Brown, Mary E.; Walls, Susan C.

    2013-01-01

    Amphibians in freshwater coastal wetlands periodically experience acute exposure to salinity from hurricane-related overwash events, as well as chronic exposure associated with rising sea levels. In a comparative experimental approach, we examined whether seven species of anuran amphibians vary in their tolerance to changes in salinity. In a laboratory study, we exposed larval Hyla cinerea (Green Treefrog), H. squirella (Squirrel Treefrog), Lithobates catesbeianus (American Bullfrog), L. sphenocephalus (Southern Leopard Frog), Anaxyrus terrestris (Southern Toad), and Gastrophryne carolinensis (Eastern Narrow-mouthed Toad) from an inland population in north central Florida, USA, and Osteopilus septentrionalis (Cuban Treefrog) tadpoles from an inland population in southwest Florida, to acute salinity for 72 h. For each species, we replicated trials in which tadpoles were exposed to salinities of 0.2 (control), 5, 10, 12, 14, and 16 ppt. For all species, tadpoles reared in the control and 5 ppt treatments had 96.7–100% survival. No individuals of G. carolinensis survived at salinities exceeding 5 ppt and no individuals of any species survived in the 14 or 16 ppt treatments. For all other native species, survival at 10 ppt ranged from 46.7 to 80%, but declined to 0% at 12 ppt (except for H. cinerea, of which only 3.3% survived at 12 ppt). In contrast, all individuals of the invasive, non-native O. septentrionalis survived exposure to a salinity of 10 ppt, and survival in this species remained relatively high at 12 ppt. Our results illustrate that the non-native O. septentrionalis has a higher salinity tolerance than the native species tested, which may contribute to its invasion potential. Moreover, species commonly associated with coastal freshwater wetlands differ in their salinity tolerances, suggesting that salt water intrusion due to storm surges and sea level rise may affect the species composition of these ecosystems.

  2. Compensating for Deviant Middle Ear Pressure in Otoacoustic Emission Measurements, Data, and Comparison to a Middle Ear Model

    NARCIS (Netherlands)

    Hof, Janny R.; de Kleine, Emile; Avan, Paul; Anteunis, Lucien J. C.; Koopmans, Peter J.; van Dijk, Pim

    Objective: Deviant middle ear pressure has a negative effect on the forward and backward transmission of stimulus and emissions through the middle ear. Resolving this deviant middle ear pressure is expected to lead to better middle ear transmission and, as a result of this, stronger otoacoustic

  3. The evolution of tetrapod ears and the fossil record.

    Science.gov (United States)

    Clack, J A

    1997-01-01

    In the earliest tetrapods, the fenestra vestibuli was a large hole in the braincase wall bounded by bones of different embryological origins: the otic capsule and occipital arch components, and also, in all except the Devonian Acanthostega, the dermal parasphenoid. This means that the hole lay along the line of the embryonic metotic fissure. Early tetrapod braincases were poorly ossified internally, and no specialized opening for a perilymphatic duct is evident. It is arguable that the earliest tetrapods had neither a perilympllatic duct crossing the otic capsule nor a specialized auditory receptor in a separate lagenar pouch. The primitive tetrapod condition is found in the earliest amniotes, and the separate development of (1) a fenestra vestibuli confined to the limits of the otic capsule, (2) a specialized pressure relief window also derived from components on the line of the metolic fissure, (3) a nonstructural, vibratory stapes and (4) increased internal ossification of the internal walls of the otic capsule, can be traced separately in synapsids, lepidosauromorph diapsids, archosauromorph diapsids, probably turtles, and amphibians. This suggests separate development of true tympanic ears in each of these groups. Developments indicating the existence of a true tympanic ear in amniotes are first found in animals from the Triassic period, and a correlation with the evolution of insect sound production is suggested.

  4. Prenatal evaluation of the middle ear and diagnosis of middle ear hypoplasia using MRI

    Energy Technology Data Exchange (ETDEWEB)

    Katorza, Eldad; Nahama-Allouche, Catherine; Ducou le Pointe, Hubert; Garel, Catherine [Hopital d' Enfants Armand-Trousseau, Service de Radiologie, Paris (France); Castaigne, Vanina [Hopital Saint-Antoine, Service de Gynecologie-Obstetrique, Paris (France); Gonzales, Marie; Marlin, Sandrine [Hopital d' Enfants Armand-Trousseau, Service de Genetique et Embryologie medicales, Paris (France); Galliani, Eva [Hopital d' Enfants Armand-Trousseau, Service de Chirurgie maxillo-faciale, Paris (France); Jouannic, Jean-Marie; Rosenblatt, Jonathan [Hopital d' Enfants Armand-Trousseau, Service de Gynecologie-Obstetrique, Centre pluridisciplinaire de diagnostic prenatal, Paris (France)

    2011-05-15

    Analysis of the middle ear with fetal MRI has not been previously reported. To show the contribution of fetal MRI to middle ear imaging. The tympanic cavity was evaluated in 108 fetal cerebral MRI examinations (facial and/or cerebral malformation excluded) and in two cases, one of Treacher Collins syndrome (case 1) and the other of oculo-auriculo-vertebral (OUV) spectrum (case 2) with middle ear hypoplasia identified by MRI at 27 and 36 weeks' gestation, respectively. In all 108 fetuses (mean gestational age 32.5 weeks), the tympanic cavity and T2 hypointensity related to the ossicles were well visualised on both sides. Case 1 had micro/retrognathia and bilateral external ear deformity and case 2 had retrognathism with a left low-set and deformed ear. MRI made it possible to recognize the marked hypoplasia of the tympanic cavity, which was bilateral in case 1 and unilateral in case 2. Both syndromes are characterized by craniofacial abnormalities including middle ear hypoplasia, which cannot be diagnosed with US. The middle ear cavity can be visualized with fetal MRI. We emphasize the use of this imaging modality in the diagnosis of middle ear hypoplasia. (orig.)

  5. The Effects of Silicone and Acrylic Ear Mold Materials on Outer Ear Canal Resonance Characteristics.

    Science.gov (United States)

    Alnıaçık Erdoğan, Asuman; Arslan, Şeyda Nur

    2016-08-01

    The aim of this study is to investigate the effects of earmolds made of silicone and acrylic on outer ear canal resonance characteristics in terms of resonance frequency and amplitude measured in a hearing aid fitting. Outer ear canal resonance frequencies and amplitudes in open ears and those measured with silicone and acrylic ear molds were obtained from 30 participants between the ages of 20 and 25 years (average age, 22.0 years; 18 females and 12 males) with a real ear gain measurement. To observe the changes depending on probe tube placement, test-retest variation was investigated in 10 participants before the study. There was no statistically significant difference between open ear canal resonance frequencies and those measured with silicone and acrylic earmolds (p>0.05). the silicone earmold resonance amplitude values were statistically significantly lower than the open ear canal resonance amplitudes when compared to those of the acrylic earmolds (p<0.05). Depending on the changes occurring in outer ear resonance features as a result of earmold materials used in hearing aid fittings, the application of earmolds should be done by experienced specialists.

  6. The use of bioacoustics in anuran taxonomy: theory, terminology, methods and recommendations for best practice.

    Science.gov (United States)

    Köhler, Jörn; Jansen, Martin; Rodríguez, Ariel; Kok, Philippe J R; Toledo, Luís Felipe; Emmrich, Mike; Glaw, Frank; Haddad, Célio F B; Rödel, Mark-Oliver; Vences, Miguel

    2017-04-11

    Vocalizations of anuran amphibians have received much attention in studies of behavioral ecology and physiology, but also provide informative characters for identifying and delimiting species. We here review the terminology and variation of frog calls from a perspective of integrative taxonomy, and provide hands-on protocols for recording, analyzing, comparing, interpreting and describing these sounds. Our focus is on advertisement calls, which serve as premating isolation mechanisms and, therefore, convey important taxonomic information. We provide recommendations for terminology of frog vocalizations, with call, note and pulse being the fundamental subunits to be used in descriptions and comparisons. However, due to the complexity and diversity of these signals, an unequivocal application of the terms call and note can be challenging. We therefore provide two coherent concepts that either follow a note-centered approach (defining uninterrupted units of sound as notes, and their entirety as call) or a call-centered approach (defining uninterrupted units as call whenever they are separated by long silent intervals) in terminology. Based on surveys of literature, we show that numerous call traits can be highly variable within and between individuals of one species. Despite idiosyncrasies of species and higher taxa, the duration of calls or notes, pulse rate within notes, and number of pulses per note appear to be more static within individuals and somewhat less affected by temperature. Therefore, these variables might often be preferable as taxonomic characters over call rate or note rate, which are heavily influenced by various factors. Dominant frequency is also comparatively static and only weakly affected by temperature, but depends strongly on body size. As with other taxonomic characters, strong call divergence is typically indicative of species-level differences, whereas call similarities of two populations are no evidence for them being conspecific

  7. Lethal and Sublethal Effects of Glyphosate (Roundup® Active to Embryos of Colombian Anurans

    Directory of Open Access Journals (Sweden)

    Teófila María Triana Velásquez

    2013-05-01

    Full Text Available Glyphosate is an herbicide widely used in agriculture, which may affect non-target species. The aim of this study was to determine the lethal (Median lethal concentration - LC50 and sublethal effects (changes on body size and development of glyphosate (Roundup® Active to embryos of four anuran species, exposed during 96 hours under laboratory and microcosm tests. Under laboratory conditions, Engystomops pustulosus was the most tolerant species (LC50 = 3033,18 μg a.e./L and Rhinella marina was the most sensitive (LC50 = 1421,46 μg a.e./L, which also showed a delayed development and significantly reduced body size. The other species had an intermediate LC50 (Rhinella humboldti = 2899,54 μg a.e./L; Hypsiboas crepitans = 2151,88 μg a.e./L. In all cases, the laboratory LC50 was lower than the concentration used in field (5392,92 μg a.e./L, indicating a high toxic effect. In the microcosm tests, embryos of E. pustulosus were the most tolerant (LC50 = 19,41 kg a.e./ha, while R. humboldti were the most sensitive (LC50 = 10,61 kg a.e./ha. In this case, all four study species had a higher LC50 than the concentration sprayed in field (3,69 kg a.e./ ha, so a lower lethal effect, and there were no significant differences in body size and development. This result shows that the glyphosate, as the commercial presentation Roundup® Active, produce a moderate mortality on anuran embryos.EFECTOS LETALES Y SUBLETALES DEL GLIFOSATO (ROUNDUP® ACTIVO EN EMBRIONES DE ANUROS COLOMBIANOS.El glifosato es un herbicida usado en la agricultura que puede afectar especies no blanco. El objetivo del trabajo fue determinar los efectos letales (concentración letal media - CL50 y subletales (cambios en el tamaño corporal y desarrollo del glifosato (Roundup® Activo sobre embriones de cuatro especies de anuros expuestos durante 96 horas en pruebas de laboratorio y microcosmos. En laboratorio, la especie más tolerante fue Engystomops pustulosus (CL50 = 3033,18 μg a

  8. Oil road effects on the anuran community of a high canopy tank bromeliad (Aechmea zebrina) in the upper Amazon basin, Ecuador.

    Science.gov (United States)

    McCracken, Shawn F; Forstner, Michael R J

    2014-01-01

    Tropical forest canopies are among the most species-rich terrestrial habitats on earth and one of the remaining relatively unexplored biotic frontiers. Epiphytic bromeliads provide microhabitat for a high diversity of organisms in tropical forest canopies and are considered a keystone resource. A number of amphibians inhabit these phytotelmata, yet their ecological role and status in forest canopies remains unknown. For this study, anurans were collected from an upper canopy tank bromeliad (Aechmea zebrina) at ∼20-45 m (x¯ = 33 m) above the forest floor. Bromeliads were sampled from trees located near trails in undisturbed primary rainforest and oil access roads in the Yasuní Biosphere Reserve of Amazonian Ecuador. We collected 95 anurans representing 10 species from 160 bromeliads in 32 trees. We used generalized linear mixed models to assess the effects of disturbance and habitat factors on the occupancy and abundance of anurans collected. Bromeliads in forest along oil roads had a lower occupancy and abundance of anurans than those in undisturbed forest, a somewhat unexpected result due to the intactness and quality of forest adjacent to the roads. Recorded habitat variables had no relationship with occupancy or abundance of anurans, and did not differ significantly between treatments. Our findings reveal that even the minimal footprint of natural resource extraction operations, primarily roads, in rainforest environments can have significant negative impacts on the unique upper canopy anuran community. Based on these results, we recommend that natural resource development treat rainforest habitat as an offshore system where roads are not used, employ industry best practice guidelines, and current access roads be protected from colonization and further deforestation.

  9. Long-term monitoring of tropical alpine habitat change, Andean anurans, and chytrid fungus in the Cordillera Vilcanota, Peru: Results from a decade of study.

    Science.gov (United States)

    Seimon, Tracie A; Seimon, Anton; Yager, Karina; Reider, Kelsey; Delgado, Amanda; Sowell, Preston; Tupayachi, Alfredo; Konecky, Bronwen; McAloose, Denise; Halloy, Stephan

    2017-03-01

    The Cordillera Vilcanota in southern Peru is the second largest glacierized range in the tropics and home to one of the largest high-alpine lakes, Sibinacocha (4,860 m). Here, Telmatobius marmoratus (marbled water frog), Rhinella spinulosa (Andean toad), and Pleurodema marmoratum (marbled four-eyed frog) have expanded their range vertically within the past century to inhabit newly formed ponds created by ongoing deglaciation. These anuran populations, geographically among the highest (5,200-5,400 m) recorded globally, are being impacted by the chytrid fungus Batrachochytrium dendrobatidis (Bd), and the disease it causes, chytridiomycosis. In this study, we report results from over a decade of monitoring these three anuran species, their habitat, and Bd infection status. Our observations reveal dynamic changes in habitat including ongoing rapid deglaciation (18.4 m/year widening of a corridor between retreating glaciers from 2005 to 2015), new pond formation, changes in vegetation in amphibian habitat, and widespread occurrence of Bd in amphibians in seven sites. Three of these sites have tested positive for Bd over a 9- to 12-year period. In addition, we observed a widespread reduction in T. marmoratus encounters in the Vilcanota in 2008, 2009, and 2012, while encounters increased in 2013 and 2015. Despite the rapid and dynamic changes in habitat under a warming climate, continued presence of Bd in the environment for over a decade, and a reduction in one of three anuran species, we document that these anurans continue to breed and survive in this high Andean environment. High variability in anuran encounters across sites and plasticity in these populations across habitats, sites, and years are all factors that could favor repopulation postdecline. Preserving the connectivity of wetlands in the Cordillera Vilcanota is therefore essential in ensuring that anurans continue to breed and adapt as climate change continues to reshape the environment.

  10. Oil road effects on the anuran community of a high canopy tank bromeliad (Aechmea zebrina in the upper Amazon basin, Ecuador.

    Directory of Open Access Journals (Sweden)

    Shawn F McCracken

    Full Text Available Tropical forest canopies are among the most species-rich terrestrial habitats on earth and one of the remaining relatively unexplored biotic frontiers. Epiphytic bromeliads provide microhabitat for a high diversity of organisms in tropical forest canopies and are considered a keystone resource. A number of amphibians inhabit these phytotelmata, yet their ecological role and status in forest canopies remains unknown. For this study, anurans were collected from an upper canopy tank bromeliad (Aechmea zebrina at ∼20-45 m (x¯ = 33 m above the forest floor. Bromeliads were sampled from trees located near trails in undisturbed primary rainforest and oil access roads in the Yasuní Biosphere Reserve of Amazonian Ecuador. We collected 95 anurans representing 10 species from 160 bromeliads in 32 trees. We used generalized linear mixed models to assess the effects of disturbance and habitat factors on the occupancy and abundance of anurans collected. Bromeliads in forest along oil roads had a lower occupancy and abundance of anurans than those in undisturbed forest, a somewhat unexpected result due to the intactness and quality of forest adjacent to the roads. Recorded habitat variables had no relationship with occupancy or abundance of anurans, and did not differ significantly between treatments. Our findings reveal that even the minimal footprint of natural resource extraction operations, primarily roads, in rainforest environments can have significant negative impacts on the unique upper canopy anuran community. Based on these results, we recommend that natural resource development treat rainforest habitat as an offshore system where roads are not used, employ industry best practice guidelines, and current access roads be protected from colonization and further deforestation.

  11. Nematode parasites of two anuran species Rhinella schneideri (Bufonidae and Scinax acuminatus (Hylidae from Corrientes, Argentina

    Directory of Open Access Journals (Sweden)

    Cynthya Elizabeth González

    2008-12-01

    Full Text Available The nematological fauna of most anuran species from Corrientes province, north of Argentina; has not been studied. We report for the first time the nematode species found in Rhinella schneideri and Scinax acuminatus. Forty four amphibians representing two species (R. schneideri -six males, three females and two juveniles- and S. acuminatus -fifteen males and eighteen females were collected near the city of Corrientes, between January 2002 and December 2003 and searched for nematodes. R. schneideri contained eight species of nematodes (adults: Rhabdias füelleborni, R. elegans, Oswaldocruzia proencai, Cosmocerca podicipinus, C. parva and Falcaustra mascula; larvae: Porrocaecum sp. and Physaloptera sp., and S. acuminatus contained three (adults: Cosmocerca parva and Oxyascaris caudacutus; larvae: Physaloptera sp.. We present morphology (scanning electron microscope and metric information, range extensions, and new host records for these nematode species. Rev. Biol. Trop. 56 (4: 2147-2161. Epub 2008 December 12.Cuarenta y cuatro anfibios pertenecientes a dos especies (Rhinella schneideri -seis machos, tres hembras y dos juveniles- y Scinax acuminatus -quince machos y dieciocho hembras fueron recolectados para extraer nemátodos en las proximidades de la ciudad de Corrientes, provincia de Corrientes en Argentina, entre enero 2002 y diciembre 2003. Rhinella schneideri estuvo parasitada por ocho especies de nemátodos (adultos: Rhabdias füelleborni, R. elegans, Oswaldocruzia proencai, Cosmocerca podicipinus, C. parva y Falcaustra mascula; larvas: Porrocaecum sp. y Physaloptera sp., y S. acuminatus presentó tres especies de nemátodos (adultos: Cosmocerca parva y Oxyascaris caudacutus; larva: Physaloptera sp.. Para todas estas especies de nemátodos se presentan datos morfológicos y métricos, y para algunas sus nuevos ámbitos y caracteres, así como también los detalles obtenidos mediante el microscopio electrónico de barrido. Éste es el primer

  12. The bactericidal agent triclosan modulates thyroid hormone-associated gene expression and disrupts postembryonic anuran development

    Energy Technology Data Exchange (ETDEWEB)

    Veldhoen, Nik [Department of Biochemistry and Microbiology, P.O. Box 3055, Stn. CSC, University of Victoria, Victoria, British Columbia V8W 3P6 (Canada); Skirrow, Rachel C. [Pacific Environmental Science Centre, 2645 Dollarton Highway, North Vancouver, British Columbia V7H 1V2 (Canada); Osachoff, Heather [Pacific Environmental Science Centre, 2645 Dollarton Highway, North Vancouver, British Columbia V7H 1V2 (Canada); Wigmore, Heidi [Pacific Environmental Science Centre, 2645 Dollarton Highway, North Vancouver, British Columbia V7H 1V2 (Canada); Clapson, David J. [Department of Biochemistry and Microbiology, P.O. Box 3055, Stn. CSC, University of Victoria, Victoria, British Columbia V8W 3P6 (Canada); Gunderson, Mark P. [Department of Biochemistry and Microbiology, P.O. Box 3055, Stn. CSC, University of Victoria, Victoria, British Columbia V8W 3P6 (Canada); Van Aggelen, Graham [Pacific Environmental Science Centre, 2645 Dollarton Highway, North Vancouver, British Columbia V7H 1V2 (Canada); Helbing, Caren C. [Department of Biochemistry and Microbiology, P.O. Box 3055, Stn. CSC, University of Victoria, Victoria, British Columbia V8W 3P6 (Canada)]. E-mail: chelbing@uvic.ca

    2006-12-01

    We investigated whether exposure to environmentally relevant concentrations of the bactericidal agent, triclosan, induces changes in the thyroid hormone-mediated process of metamorphosis of the North American bullfrog, Rana catesbeiana and alters the expression profile of thyroid hormone receptor (TR) {alpha} and {beta}, basic transcription element binding protein (BTEB) and proliferating nuclear cell antigen (PCNA) gene transcripts. Premetamorphic tadpoles were immersed in environmentally relevant concentrations of triclosan and injected with 1 x 10{sup -11} mol/g body weight 3,5,3'-triiodothyronine (T{sub 3}) or vehicle control. Morphometric measurements and steady-state mRNA levels obtained by quantitative polymerase chain reaction were determined. mRNA abundance was also examined in Xenopus laevis XTC-2 cells treated with triclosan and/or 10 nM T{sub 3}. Tadpoles pretreated with triclosan concentrations as low as 0.15 {+-} 0.03 {mu}g/L for 4 days showed increased hindlimb development and a decrease in total body weight following T{sub 3} administration. Triclosan exposure also resulted in decreased T{sub 3}-mediated TR{beta} mRNA expression in the tadpole tail fin and increased levels of PCNA transcript in the brain within 48 h of T{sub 3} treatment whereas TR{alpha} and BTEB were unaffected. Triclosan alone altered thyroid hormone receptor {alpha} transcript levels in the brain of premetamorphic tadpoles and induced a transient weight loss. In XTC-2 cells, exposure to T{sub 3} plus nominal concentrations of triclosan as low as 0.03 {mu}g/L for 24 h resulted in altered thyroid hormone receptor mRNA expression. Exposure to low levels of triclosan disrupts thyroid hormone-associated gene expression and can alter the rate of thyroid hormone-mediated postembryonic anuran development.

  13. Perch height and the hunting success of the Indian Eagle Owl Bubo bengalensis (Franklin (Aves: Strigiformes: Strigidae targeting anuran prey.

    Directory of Open Access Journals (Sweden)

    Eric Ramanujam

    2016-06-01

    Full Text Available Investigation into the predation of a pair of Indian Eagle Owls on anurans disclosed the fact that the greatest success (52.17% was when the owls pounced from a height of less than 2m and the lowest (12.5% was from a height of 5–6 m.  No success was recorded when the owls pounced from over a height of 6m or when they tried wading in water to catch their prey.  Overall, 146 pounces were observed and the strike success was 28.7%. 

  14. CT of temporal bone - IV. inner ear

    Energy Technology Data Exchange (ETDEWEB)

    Kwon, Jae Yoon; Sung, Kyu Bo; Youn, Eun Kyoung; Park, Youn Kyeung; Lee, Young Uk [Koryo general Hospital, Seoul (Korea, Republic of)

    1990-07-15

    Temporal bone CT was done in 697 patients from April 1985 to October 1989. The abnormal findings were seen in 453 patients, which were chronic otitis media in 355 patients, fracture in 49 patients and congenital anomaly in 44 patients, etc. The abnormal findings of inner ear were observed on 46 patients. The results were summarized as follows : 1. The incidence of inner ear involvement by chronic otitis media was 7.3% (26/355 : labyrinthine fistula in 17 patients, labyrinthitis ossificans in 9 patients). Labyrinthine fistula was most commonly located on lateral semicircular canal (15/17, 88.2%). 2. Fusion of vestibule with lateral semicircular canal and formation of common cavity was demonstrated incidentally in 5 patients (0.7% of total number of temporal bone CT), and bilateral in 3 patients. 3. The incidence of inner ear anomaly in congenital ear anomaly was 11.4% (5/44). All cases were bilateral and three patients showed associated middle ear anomaly. 4. The incidence of involvement of bony labyrinth in temporal bone fracture was 10.2% (5/49). Labyrinthine fracture was seen all patients of transverse(3) and mixed fracture(1). In longitudinal fracture, labyrinthine fracture was seen in 2.2% (1/45). 5. Others were traumatic labyrinthitis ossificans(1), intracanalicular acoustic neuroma(3) and facial nerve neuroma(1)

  15. Middle ear cholesteatoma: an animal model.

    Science.gov (United States)

    Wright, C G; Meyerhoff, W L; Burns, D K

    1985-01-01

    Topical otic preparations now in clinical use contain a variety of antibiotics and solvents that may produce severe inflammation if they reach the middle ear cavity. This report describes the response of the chinchilla middle ear to direct application of one such preparation that appears to act as a nonspecific irritant. Cortisporin otic suspension (containing neomycin, polymyxin B, hydrocortisone, and propylene glycol) was introduced into the bullae of 32 chinchillas that were kept alive for four days to five months before histologic examination of their temporal bones. All the experimental animals had tissue damage and inflammation within the middle ear. The changes observed included proliferation of ciliated and secretory columnar cells, formation of granulation tissue, bone erosion, and osteoneogenesis. Some areas of the mucosa underwent metaplasia to stratified squamous epithelium; this metaplastic epithelium, however, did not produce keratin. In the majority of animals kept for two months or more, cholesteatoma was identified in the middle ear. The cholesteatomas appeared to develop as a result of penetration of external canal epidermis through intact tympanic membranes or as the result of migration of epidermis through perforations. The experimental cholesteatomas behaved like those seen clinically in humans, with extensive erosion of bony structures within the middle ear.

  16. Virtual endoscopy of the middle ear

    Energy Technology Data Exchange (ETDEWEB)

    Neri, E.; Caramella, D.; Panconi, M.; Bartolozzi, C. [Pisa Univ. (Italy). Dept. of Oncology, Transplants and Advanced Technologies in Medicine; Berettini, S.; Sellari Franceschini, S.; Forli, F. [Pisa Univ. (Italy). Dept. of Neuroscience

    2001-01-01

    Virtual endoscopy is a computer-generated simulation of fiberoptic endoscopy, and its application to the study of the middle ear has been recently proposed. The need to represent the middle ear anatomy by means of virtual endoscopy arose from the increased interest of otolarygologists in transtympanic endoscopy. In fact, this imaging method allows the visualization of middle ear anatomy with high detail, but it is evasive and is essentially used for surgical guidance. Virtual endoscopy provides similar perspectives of the tympanic cavity but does not require the tympanic perforation. In the study of the middle ear, specific attention is given to the retroperitoneum. This region contains elevations of the medial wall (pyramidal eminence and ridge, styloid eminence and ridge, subiculum, ponticulus) and depressions (sinus tympani, posterior sinus tympani, facial sinus, fossula of Grivot, oval window fossula), which can be effectively displayed by virtual endoscopy. Virtual endoscopy is foreseen as a useful tool in preoperative management of patients who are candidates for middle ear surgery, since it can predict with high detail the patient's specific anatomy by imaging perspectives familiar to otosurgeons. (orig.)

  17. Ear Acupuncture in European Traditional Medicine

    Directory of Open Access Journals (Sweden)

    Luigi Gori

    2007-01-01

    Full Text Available Auricular acupuncture is a diagnostic and treatment system based on normalizing the body's dysfunction through stimulation of definite points on the ear. Rudimentary forms of acupuncture which probably arose during the Stone Age have survived in many parts of the world right down to present day. It was used in the ancient Egypt, Rome, Greece and all the Mediterranean area. It is a microacupuncture technique similar to reflexology, and was first described in France in 1950 by Paul Nogier who is considered the Father of modern ear acupuncture. It was speculated that the technique works because groups of pluripotent cells contain information from the whole organism and create regional organization centers representing different parts of the body. Nevertheless stimulation of a reflex point in the ear seems relieve symptoms of distant pathologies. Modern research is confirming the efficacy of ear acupuncture for analgesia and anxiety related disease, while tobacco dependence and other substance abuse still need confirmation. Actually main methodological problems with auricular acupuncture are that exist too many maps with little agreement regarding point location in the ear, and that the correspondence or reflex systems does not correlated with modern knowledge of anatomy and physiology.

  18. The history of AIDS exceptionalism

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    Smith Julia H

    2010-12-01

    Full Text Available Abstract In the history of public health, HIV/AIDS is unique; it has widespread and long-lasting demographic, social, economic and political impacts. The global response has been unprecedented. AIDS exceptionalism - the idea that the disease requires a response above and beyond "normal" health interventions - began as a Western response to the originally terrifying and lethal nature of the virus. More recently, AIDS exceptionalism came to refer to the disease-specific global response and the resources dedicated to addressing the epidemic. There has been a backlash against this exceptionalism, with critics claiming that HIV/AIDS receives a disproportionate amount of international aid and health funding. This paper situations this debate in historical perspective. By reviewing histories of the disease, policy developments and funding patterns, it charts how the meaning of AIDS exceptionalism has shifted over three decades. It argues that while the connotation of the term has changed, the epidemic has maintained its course, and therefore some of the justifications for exceptionalism remain.

  19. Ear damage caused by leisure noise.

    Science.gov (United States)

    Maassen, M.; Babisch, W.; Bachmann, K. D.; Ising, H.; Lehnert, G.; Plath, P.; Plinkert, P.; Rebentisch, E.; Schuschke, G.; Spreng, M.; Stange, G.; Struwe, V.; Zenner, H. P.

    2001-01-01

    Noise is a health risk. Recent findings suggest that leisure noise is a substantial danger especially to children, teenagers and young adults. Epidemiological studies of teenagers with no occupational noise exposure show an increasing number with a substantial and measurable irreversible inner ear damage. This is basically due to the wide spread exposition to very loud toys (pistols and squibs), crackers and exposure to electronically amplified music, e.g. from personal cassette players (PCP), at discos or concerts etc. Protection against irreversible ear damage by leisure noise has an important impact in preventive medical care. Therefore the general public must be informed that loud leisure activities may cause damage to the ear. In order to protect children, young people and adults, the legislature ought to set limits for sound levels in discos, concert halls and for music equipment and toys by establishing the necessary standards and regulations.

  20. Lymphatic drainage of the external ear.

    Science.gov (United States)

    Pan, Wei-Ren; le Roux, Cara Michelle; Levy, Sidney M; Briggs, Christopher A

    2011-01-01

    Lymphoscintigraphy reveals inconsistencies in our knowledge of the lymphatic anatomy of the external ear. Fifteen external ears from 9 unembalmed human cadavers were studied. Six percent hydrogen peroxide was used to find the lymphatic vessels using a surgical microscope. They were injected with a radio-opaque mixture, dissected, photographed, and radiographed to demonstrate lymphatic vessels in the tissue. Final results were transferred to the computer for analysis. Four groups of lymph collecting vessels were found. The anterior branch, in all specimens, drained directly or indirectly (having merged with a vessel descending from the scalp) into the preauricular lymph nodes. The superior, middle, and inferior (lobule) branches drained to their multiple first tier lymph nodes. An accurate lymphatic map of the external ear is described to upgrade our anatomic knowledge. It will be of benefit for the clinical management of malignancies in this region. © 2010 Wiley Periodicals, Inc. Head Neck, 2011.

  1. Endoscopic anatomy of the pediatric middle ear.

    Science.gov (United States)

    Isaacson, Glenn

    2014-01-01

    Traditionally, otologists have aimed to produce a clean, dry, safe ear with the best possible hearing result. More recently, "less invasively" has been added to this list of goals. The development of small-diameter, high-quality rigid endoscopes and high-definition video systems has made totally endoscopic, transcanal surgery a reality in adult otology and a possibility in pediatric otology. This article reviews the anatomy of the pediatric middle ear and its surrounding airspaces and structures based on the work of dozens of researchers over the past 50 years. It will focus on the developmental changes in ear anatomy from birth through the first decade, when structure and function change most rapidly. Understanding the limits and possibilities afforded by new endoscopic technologies, the pediatric otologist can strive for results matching or exceeding those achieved by more invasive surgical approaches.

  2. Anteverted concha: A new ear deformational anomaly

    Directory of Open Access Journals (Sweden)

    Fabrizio Schönauer

    2015-09-01

    Full Text Available Most auricular deformities involve the helix and the antihelix (Stahl's bar, lop and prominent ear; an isolated conchal deformity is uncommon in an otherwise normal ear. When a convexity rather than a concavity of the concha is present, it can be defined as “anteverted concha”. The anteverted concha causes not only aesthetic but also functional problems. It may be so severe as to occlude the external auditory meatus. In a newborn ear amenable to moulding, anteverted concha can be treated non-surgically by splinting. If this time window has passed, then surgical excision of the conchal bulge can give good results in the adult. We present two such cases and their treatment.

  3. Autophagy in the Vertebrate Inner Ear

    Directory of Open Access Journals (Sweden)

    Marta Magariños

    2017-05-01

    Full Text Available Autophagy is a conserved catabolic process that results in the lysosomal degradation of cell components. During development, autophagy is associated with tissue and organ remodeling, and under physiological conditions it is tightly regulated as it plays a housekeeping role in removing misfolded proteins and damaged organelles. The vertebrate inner ear is a complex sensory organ responsible for the perception of sound and for balance. Cell survival, death and proliferation, as well as cell fate specification and differentiation, are processes that are strictly coordinated during the development of the inner ear in order to generate the more than a dozen specialized cell types that constitute this structure. Here, we review the existing evidence that implicates autophagy in the generation of the vertebrate inner ear. At early stages of chicken otic development, inhibiting autophagy impairs neurogenesis and causes aberrant otocyst morphogenesis. Autophagy provides energy for the clearing of dying cells and it favors neuronal differentiation. Moreover, autophagy is required for proper vestibular development in the mouse inner ear. The autophagy-related genes Becn1, Atg4g, Atg5, and Atg9, are expressed in the inner ear from late developmental stages to adulthood, and Atg4b mutants show impaired vestibular behavior associated to defects in otoconial biogenesis that are also common to Atg5 mutants. Autophagic flux appears to be age-regulated, augmenting from perinatal stages to young adulthood in mice. This up-regulation is concomitant with the functional maturation of the hearing receptor. Hence, autophagy can be considered an intracellular pathway fundamental for in vertebrate inner ear development and maturation.

  4. Autophagy in the Vertebrate Inner Ear.

    Science.gov (United States)

    Magariños, Marta; Pulido, Sara; Aburto, María R; de Iriarte Rodríguez, Rocío; Varela-Nieto, Isabel

    2017-01-01

    Autophagy is a conserved catabolic process that results in the lysosomal degradation of cell components. During development, autophagy is associated with tissue and organ remodeling, and under physiological conditions it is tightly regulated as it plays a housekeeping role in removing misfolded proteins and damaged organelles. The vertebrate inner ear is a complex sensory organ responsible for the perception of sound and for balance. Cell survival, death and proliferation, as well as cell fate specification and differentiation, are processes that are strictly coordinated during the development of the inner ear in order to generate the more than a dozen specialized cell types that constitute this structure. Here, we review the existing evidence that implicates autophagy in the generation of the vertebrate inner ear. At early stages of chicken otic development, inhibiting autophagy impairs neurogenesis and causes aberrant otocyst morphogenesis. Autophagy provides energy for the clearing of dying cells and it favors neuronal differentiation. Moreover, autophagy is required for proper vestibular development in the mouse inner ear. The autophagy-related genes Becn1, Atg4g, Atg5, and Atg9, are expressed in the inner ear from late developmental stages to adulthood, and Atg4b mutants show impaired vestibular behavior associated to defects in otoconial biogenesis that are also common to Atg5 mutants. Autophagic flux appears to be age-regulated, augmenting from perinatal stages to young adulthood in mice. This up-regulation is concomitant with the functional maturation of the hearing receptor. Hence, autophagy can be considered an intracellular pathway fundamental for in vertebrate inner ear development and maturation.

  5. [The tempestuous history of middle ear operation].

    Science.gov (United States)

    Betlejewski, Stanisław; Betlejewski, Andrzej

    2008-01-01

    The paper is a review of primary and secondary historical and scientific literature concerning the surgical treatment of the middle ear diseases. The development of mastoid surgery can be traced through the past 4 centuries. Once used as a means of evacuating a postauricular abscess, it has evolved to become a method for gaining entry into the middle ear to control acute and chronic ear diseases, or for treatment of otogenic complications. Earlier works led the way to the postauricular "Wilde incision", which gave rise to Schwartze mastoidectomy. Oscar Wilde's ultimate demise from an otogenic meningitis appears all the more ironic when one considers the role his father, Sir William Wilde, played as one of the founding fathers of modern otology. The death of baron von Berger after mastoidectomy performed for treatment of tinnitus and hypacusis, stopped the further development of surgical procedures for about hundred years. The Joseph Toynbee's "Diseases of the ear" was the first work about ear diseases on a pathologic anatomical base, and fundamental for otology of the German speaking countries in the nineteenth and early twentieth centuries. Otology was emerging as a specific specialty. Von Tröltsch was the first surgeon, who proposed the antral opening through the external ear canal. When Schwartze and his assistant, Eysell, published their paper: "On the Artificial Opening of the Mastoid Air Cells," a century or so had passed since the few previous attempts to remove the tegmen of the mastoid had been reported. One of the greatest otologists of the 19th century was Adam Politzer, His influence on the 50 years of otology has never been equaled. It is in his honor that the International Society of Otology bears his name.

  6. Ultrastructure of the middle ear mucosa.

    Science.gov (United States)

    Hentzer, E

    1984-01-01

    Light- and electron microscopic studies of recent years have definitely concluded that the epithelium of the middle ear is a modified respiratory epithelium with ciliated and secretory cells including goblet cells. Goblet cells are secretory cells completely filled with secretory granules. Secretory cells and ciliated cells are both derived from the basal cell. The subepithelial layer which consists of loose connective tissue is a structure of just as great importance as the epithelial layer. It is still not clear whether the dark granulated cell is the site of production of the serous middle ear effusion or whether it merely represents an immature stage of the mucigen-producing cell.

  7. Exception handling for sensor fusion

    Science.gov (United States)

    Chavez, G. T.; Murphy, Robin R.

    1993-08-01

    This paper presents a control scheme for handling sensing failures (sensor malfunctions, significant degradations in performance due to changes in the environment, and errant expectations) in sensor fusion for autonomous mobile robots. The advantages of the exception handling mechanism are that it emphasizes a fast response to sensing failures, is able to use only a partial causal model of sensing failure, and leads to a graceful degradation of sensing if the sensing failure cannot be compensated for. The exception handling mechanism consists of two modules: error classification and error recovery. The error classification module in the exception handler attempts to classify the type and source(s) of the error using a modified generate-and-test procedure. If the source of the error is isolated, the error recovery module examines its cache of recovery schemes, which either repair or replace the current sensing configuration. If the failure is due to an error in expectation or cannot be identified, the planner is alerted. Experiments using actual sensor data collected by the CSM Mobile Robotics/Machine Perception Laboratory's Denning mobile robot demonstrate the operation of the exception handling mechanism.

  8. Exceptional cognitive ability: the phenotype.

    Science.gov (United States)

    Lubinski, David

    2009-07-01

    Characterizing the outcomes related to the phenotype of exceptional cognitive abilities has been feasible in recent years due to the availability of large samples of intellectually precocious adolescents identified by modern talent searches that have been followed-up longitudinally over multiple decades. The level and pattern of cognitive abilities, even among participants within the top 1% of general intellectual ability, are related to differential developmental trajectories and important life accomplishments: The likelihood of earning a doctorate, earning exceptional compensation, publishing novels, securing patents, and earning tenure at a top university (and the academic disciplines within which tenure is most likely to occur) all vary as a function of individual differences in cognitive abilities assessed decades earlier. Individual differences that distinguish the able (top 1 in 100) from the exceptionally able (top 1 in 10,000) during early adolescence matter in life, and, given the heritability of general intelligence, they suggest that understanding the genetic and environmental origins of exceptional abilities should be a high priority for behavior genetic research, especially because the results for extreme groups could differ from the rest of the population. In addition to enhancing our understanding of the etiology of general intelligence at the extreme, such inquiry may also reveal fundamental determinants of specific abilities, like mathematical versus verbal reasoning, and the distinctive phenotypes that contrasting ability patterns are most likely to eventuate in at extraordinary levels.

  9. 78 FR 4881 - Excepted Service

    Science.gov (United States)

    2013-01-23

    ... MANAGEMENT Excepted Service AGENCY: U.S. Office of Personnel Management (OPM). ACTION: Notice. SUMMARY: This... Executive Resources Services, Executive Resources and Employee Development, Employee Services, 202- 606-2246.../2012 Headquarters Services. Office of Assistant Speechwriter......... DD130012 11/9/2012 Secretary of...

  10. Exceptional and Spinorial Conformal Windows

    DEFF Research Database (Denmark)

    Mojaza, Matin; Pica, Claudio; Ryttov, Thomas

    2012-01-01

    We study the conformal window of gauge theories containing fermionic matter fields, where the gauge group is any of the exceptional groups with the fermions transforming according to the fundamental and adjoint representations and the orthogonal groups where the fermions transform according...

  11. Learned Helplessness in Exceptional Children.

    Science.gov (United States)

    Brock, Herman B.; Kowitz, Gerald T.

    The research literature on learned helplessness in exceptional children is reviewed and the authors' efforts to identify and retrain learning disabled (LD) children who have characteristics typical of learned helplessness are reported. Twenty-eight elementary aged LD children viewed as "learned helpless" were randomly assigned to one of four…

  12. One year in the life of Bufo punctatus: annual patterns of body temperature in a free-ranging desert anuran

    Science.gov (United States)

    Rausch, Candice M.; Starkweather, Peter L.; van Breukelen, Frank

    2008-06-01

    The Mojave Desert is characterized by hot dry summers and cold winters. The red-spotted toad ( Bufo ( Anaxyrus) punctatus) is the predominant anuran species; yet little is known of their thermal histories and strategies to avoid temperature extremes. We measured body temperature ( T b) in free-ranging adult toads across all four seasons of a year using implanted data loggers. There is marked individual variation in the temperatures experienced by these toads. As expected, toads generally escape extreme seasonal and diel temperature fluctuations. However, our data demonstrate a much wider estimated T b range than was previously assumed. Though often for short periods, red-spotted toads do experience T b as low as 3.1°C and as high as 39.1°C. All animals showed periods of prolonged thermal stability in cooler months and wider diel oscillations in warmer months. Red-spotted toad thermal history is likely a function of site choice; the exploitation of different refuges results in diverse thermal experiences. These data represent the most complete record of thermal experiences for a desert anuran and reveal greater extremes in body temperature than previously suggested.

  13. Do anuran larvae respond behaviourally to chemical cues from an invasive crayfish predator? A community-wide study.

    Science.gov (United States)

    Nunes, Ana L; Richter-Boix, Alex; Laurila, Anssi; Rebelo, Rui

    2013-01-01

    Antipredator behaviour is an important fitness component in most animals. A co-evolutionary history between predator and prey is important for prey to respond adaptively to predation threats. When non-native predator species invade new areas, native prey may not recognise them or may lack effective antipredator defences. However, responses to novel predators can be facilitated by chemical cues from the predators' diet. The red swamp crayfish Procambarus clarkii is a widespread invasive predator in the Southwest of the Iberian Peninsula, where it preys upon native anuran tadpoles. In a laboratory experiment we studied behavioural antipredator defences (alterations in activity level and spatial avoidance of predator) of nine anurans in response to P. clarkii chemical cues, and compared them with the defences towards a native predator, the larval dragonfly Aeshna sp. To investigate how chemical cues from consumed conspecifics shape the responses, we raised tadpoles with either a tadpole-fed or starved crayfish, or dragonfly larva, or in the absence of a predator. Five species significantly altered their behaviour in the presence of crayfish, and this was largely mediated by chemical cues from consumed conspecifics. In the presence of dragonflies, most species exhibited behavioural defences and often these did not require the presence of cues from predation events. Responding to cues from consumed conspecifics seems to be a critical factor in facilitating certain behavioural responses to novel exotic predators. This finding can be useful for predicting antipredator responses to invasive predators and help directing conservation efforts to the species at highest risk.

  14. Urea is not a universal cryoprotectant among hibernating anurans: evidence from the freeze-tolerant boreal chorus frog (Pseudacris maculata).

    Science.gov (United States)

    Higgins, Steven A; Swanson, David L

    2013-02-01

    Freeze-tolerant organisms accumulate a diversity of low molecular weight compounds to combat negative effects of ice formation. Previous studies of anuran freeze tolerance have implicated urea as a cryoprotectant in the wood frog (Lithobates sylvatica). However, a cryoprotective role for urea has been identified only for wood frogs, though urea accumulation is an evolutionarily conserved mechanism for coping with osmotic stress in amphibians. To identify whether multiple solutes are involved in freezing tolerance in the boreal chorus frog (Pseudacris maculata), we examined seasonal and freezing-induced variation in several potential cryoprotectants. We further tested for a cryoprotective role for urea by comparing survival and recovery from freezing in control and urea-loaded chorus frogs. Tissue levels of glucose, urea, and glycerol did not vary significantly among seasons for heart, liver, or leg muscle. Furthermore, no changes in urea or glycerol levels were detected with exposure to freezing temperatures in these tissues. Urea-loading increased tissue urea concentrations, but failed to enhance freezing survival or facilitate recovery from freezing in chorus frogs in this study, suggesting little role for urea as a natural cryoprotectant in this species. These data suggest that urea may not universally serve as a primary cryoprotectant among freeze-tolerant, terrestrially hibernating anurans. Copyright © 2012 Elsevier Inc. All rights reserved.

  15. Larval tolerance to salinity in three species of Australian anuran: an indication of saline specialisation in Litoria aurea.

    Directory of Open Access Journals (Sweden)

    Brian D Kearney

    Full Text Available Recent anthropogenic influences on freshwater habitats are forcing anuran populations to rapidly adapt to high magnitude changes in environmental conditions or face local extinction. We examined the effects of ecologically relevant elevated salinity levels on larval growth, metamorphosis and survival of three species of Australian anuran; the spotted marsh frog (Limnodynastes tasmaniensis, the painted burrowing frog (Neobatrachus sudelli and the green and golden bell frog (Litoria aurea, in order to better understand the responses of these animals to environmental change. Elevated salinity (16% seawater negatively impacted on the survival of L. tasmaniensis (35% survival and N sudelli (0% survival, while reduced salinity had a negative impact on L. aurea. (16% seawater: 85% survival; 0.4% seawater: 35% survival. L. aurea tadpoles survived in salinities much higher than previously reported for this species, indicating the potential for inter-populations differences in salinity tolerance. In L. tasmaniensis and L. aurea, development to metamorphosis was fastest in low and high salinity treatments suggesting it is advantageous for tadpoles to invest energy in development in both highly favourable and developmentally challenging environments. We propose that this response might either maximise potential lifetime fecundity when tadpoles experience favourable environments, or, facilitate a more rapid escape from pond environments where there is a reduced probability of survival.

  16. Body lift, drag and power are relatively higher in large-eared than in small-eared bat species.

    Science.gov (United States)

    Håkansson, Jonas; Jakobsen, Lasse; Hedenström, Anders; Johansson, L Christoffer

    2017-10-01

    Bats navigate the dark using echolocation. Echolocation is enhanced by external ears, but external ears increase the projected frontal area and reduce the streamlining of the animal. External ears are thus expected to compromise flight efficiency, but research suggests that very large ears may mitigate the cost by producing aerodynamic lift. Here we compare quantitative aerodynamic measures of flight efficiency of two bat species, one large-eared (Plecotus auritus) and one small-eared (Glossophaga soricina), flying freely in a wind tunnel. We find that the body drag of both species is higher than previously assumed and that the large-eared species has a higher body drag coefficient, but also produces relatively more ear/body lift than the small-eared species, in line with prior studies on model bats. The measured aerodynamic power of P. auritus was higher than predicted from the aerodynamic model, while the small-eared species aligned with predictions. The relatively higher power of the large-eared species results in lower optimal flight speeds and our findings support the notion of a trade-off between the acoustic benefits of large external ears and aerodynamic performance. The result of this trade-off would be the eco-morphological correlation in bat flight, with large-eared bats generally adopting slow-flight feeding strategies. © 2017 The Author(s).

  17. The first neutron beam hits EAR2

    CERN Multimedia

    Antonella Del Rosso

    2014-01-01

    On 25 July 2014, about a year after construction work began, the Experimental Area 2 (EAR2) of CERN’s neutron facility n_TOF recorded its first beam. Unique in many aspects, EAR2 will start its rich programme of experimental physics this autumn.   The last part of the EAR2 beamline: the neutrons come from the underground target and reach the top of the beamline, where they hit the samples. Built about 20 metres above the neutron production target, EAR2 is in fact a bunker connected to the n_TOF underground facilities via a duct 80 cm in diameter, where the beamline is installed. The feet of the bunker support pillars are located on the concrete structure of the n_TOF tunnel and part of the structure lies above the old ISR building. A beam dump located on the roof of the building completes the structure. Neutrons are used by physicists to study neutron-induced reactions with applications in a number of fields, including nuclear waste transmutation, nuclear technology, nuclear astrop...

  18. Getting Teens to Read with Their Ears

    Science.gov (United States)

    Fues, Marianne Cole

    2009-01-01

    Audiobooks have been around for years in various formats, like cassette tapes and CDs. This article describes a new type of audiobook on the market which is generating an interest in "reading." The device, called Playaway, is the size of a MP3 player and comes with a lanyard and ear buds. Buttons on the back of the player control the…

  19. Infrared typmanic tempature and ear canal morphology

    NARCIS (Netherlands)

    Daanen, H.A.M.

    2006-01-01

    Several publications indicate that the infrared tympanic temperature (IRTT) underestimates the core temperature of the body when the ear canal is long, curvy and narrow. In order to quantify these observations, a study was performed in 10 subjects. The IRTT was determined and compared to the

  20. Objective Audiometry using Ear-EEG

    DEFF Research Database (Denmark)

    Christensen, Christian Bech; Kidmose, Preben

    therefore be an enabling technology for objective audiometry out of the clinic, allowing regularly fitting of the hearing aids to be made by the users in their everyday life environment. The objective of this study is to investigate the application of ear-EEG in objective audiometry....

  1. Coupled ears in lizards and crocodilians

    DEFF Research Database (Denmark)

    Carr, Catherine E; Christensen-Dalsgaard, Jakob; Bierman, Hilary

    2016-01-01

    the processing of low-frequency directional signals, while higher frequency signals appear to be progressively uncoupled. In both lizards and crocodilians, the increased directionality of the coupled ears leads to an effectively larger head and larger physiological range of ITDs. This increased physiological...... range is reviewed in the light of current theories of sound localization....

  2. BK Channels in the Vertebrate Inner Ear

    NARCIS (Netherlands)

    Pyott, S. J.; Duncan, R. K.; Contet, C

    2016-01-01

    The perception of complex acoustic stimuli begins with the deconstruction of sound into its frequency components. This spectral processing occurs first and foremost in the inner ear. In vertebrates, two very different strategies of frequency analysis have evolved. In nonmammalian vertebrates, the

  3. Helminth community structure and diet of three Afrotropical anuran species: a test of the interactive-versus-isolationist parasite communities hypothesis

    Directory of Open Access Journals (Sweden)

    G. C. Akani

    2011-09-01

    Full Text Available The interactive-versus-isolationist hypothesis predicts that parasite communities should be depauperated and weakly structured by interspecific competition in amphibians. A parasitological survey was carried out to test this hypothesis using three anuran species from Nigeria, tropical Africa (one Bufonidae; two Ranidae. High values of parasite infection parameters were found in all three species, which were infected by nematodes, cestodes and trematodes. Nonetheless, the parasite communities of the three anurans were very depauperated in terms of number of species (4 to 6. Interspecific competition was irrelevant in all species, as revealed by null models and Monte Carlo permutations. Cluster analyses revealed that, in terms of parasite community composition, the two Ranidae were similar, whereas the Bufonidae was more different. However, when prevalence, intensity, and abundance of parasites are combined into a multivariate analysis, each anuran species was clearly spaced apart from the others, thus revealing considerable species-specific differences in terms of their parasite communities. All anurans were generalists and probably opportunistic in terms of dietary habits, and showed no evidence of interspecific competition for food. Overall, our data are widely consistent with expectations driven from the interactive-versus-isolationist parasite communities hypothesis.

  4. Evaluation of the incidence of bacteremia following middle ear operations

    OpenAIRE

    Mohammad Naeimi; Kiarash Ghazvini K; Mohammad Taghi Shakeri MT; Merangiz Kaboli; Mahmood Bagheri

    2009-01-01

    Introduction: Bacteremia following middle ear surgeries occurs in a significant number of patients. The aim of this study is to investigate the incidence of bacteremia following middle ear surgeries. Materials and Methods: Sixty two patients who where candidates for middle ear operation were enrolled in this study. Blood samples were obtained from each patient immediately before and after operation for bacteriologic analysis. Demographic and middle ear disease characteristics were also record...

  5. The Exceptional State in Africa

    DEFF Research Database (Denmark)

    Suzuki, Shogo

    2013-01-01

    China's relations with African states have undergone significant changes in recent years. China has projected its relationship with Africa as one of equality and ‘mutual help’. Such perceptions of foreign policy stem from the Five Principles of Peaceful Coexistence and the shared experience...... of imperialist domination and economic underdevelopment. Moreover, various public statements by China's elites suggest that China is expected to play a much more prominent, even exceptional role in Africa. This purportedly entails moving beyond the hegemonic West's interventionist aid or security policies......, and is also implicitly designed to highlight the West's shortcomings in promoting African economic growth or peace. Yet where does this perception of exceptionalism come from? Why does Beijing feel that it has to play a leading role in Africa's development? How can Beijing distinguish itself from the nations...

  6. Geometric phase around exceptional points

    OpenAIRE

    Mailybaev, Alexei; Kirillov, Oleg; Seyranian, Alexander,

    2005-01-01

    A wave function picks up, in addition to the dynamic phase, the geometric (Berry) phase when traversing adiabatically a closed cycle in parameter space. We develop a general multidimensional theory of the geometric phase for (double) cycles around exceptional degeneracies in non-Hermitian Hamiltonians. We show that the geometric phase is exactly $\\pi$ for symmetric complex Hamiltonians of arbitrary dimension and for nonsymmetric non-Hermitian Hamiltonians of dimension 2. For nonsymmetric non-...

  7. Virtual otoscopy for evaluating the inner ear with a fluid-filled tympanic cavity in dogs.

    Science.gov (United States)

    Cho, Youngkwon; Jeong, Jimo; Lee, Haebeom; Kim, Minsu; Kim, Namsoo; Lee, Kichang

    2012-12-01

    The feasibility of virtual otoscopy (VO) imaging was evaluated in five dogs with experimentally induced otitis media, two control dogs, and two canine patients with otitis media. VO images of the tympanic cavity and ossicles were generated with commercially available software using raw computed tomography (CT) data. Eight out of 10 ears inoculated with pathogen exhibited obvious clinical signs associated with otitis externa. CT images revealed soft tissue density material occupying the tympanic bulla compatible with otitis media in three dogs with experimentally induced otitis media and two patients. No remarkable features were observed on the radiographs. Four different VO views (ear canal, tympanic bulla, eustachian tube, and ossicular chain) were created. Promontory, cochlea window, tympanic, and septum bulla as well as ossicles were easily and clearly distinguished except for the incus and stapes of the clinical patients. VO images were not more suitable than images created with conventional CT for accurately diagnosing otitis media in this study. However, it appears that VO could be more feasible for assessing the complex structure of the inner ear in dogs with fluid-filled tympanic cavities since fluid accumulation within the tympanic bulla did not affect the evaluation of bony tissue in the middle ear on VO images.

  8. [European Portuguese EARS test battery adaptation].

    Science.gov (United States)

    Alves, Marisa; Ramos, Daniela; Oliveira, Graça; Alves, Helena; Anderson, Ilona; Magalhães, Isabel; Martins, Jorge H; Simões, Margarida; Ferreira, Raquel; Fonseca, Rita; Andrade, Susana; Silva, Luís; Ribeiro, Carlos; Ferreira, Pedro Lopes

    2014-01-01

    The use of adequate assessment tools in health care is crucial for the management of care. The lack of specific tools in Portugal for assessing the performance of children who use cochlear implants motivated the translation and adaptation of the EARS (Evaluation of Auditory Responses to Speech) test battery into European Portuguese. This test battery is today one of the most commonly used by (re)habilitation teams of deaf children who use cochlear implants worldwide. The goal to be achieved with the validation of EARS was to provide (re)habilitation teams an instrument that enables: (i) monitoring the progress of individual (re)habilitation, (ii) managing a (re)habilitation program according to objective results, comparable between different (re)habilitation teams, (iii) obtaining data that can be compared with the results of international teams, and (iv) improving engagement and motivation of the family and other professionals from local teams. For the test battery translation and adaptation process, the adopted procedures were the following: (i) translation of the English version into European Portuguese by a professional translator, (ii) revision of the translation performed by an expert panel, including doctors, speech-language pathologists and audiologists, (iii) adaptation of the test stimuli by the team's speechlanguage pathologist, and (iv) further review by the expert panel. For each of the tests that belong to the EARS battery, the introduced adaptations and adjustments are presented, combining the characteristics and objectives of the original tests with the linguistic and cultural specificities of the Portuguese population. The difficulties that have been encountered during the translation and adaptation process and the adopted solutions are discussed. Comparisons are made with other versions of the EARS battery. We defend that the translation and the adaptation process followed for the EARS test battery into European Portuguese was correctly conducted

  9. Middle Ear Barotrauma in Student Pilots.

    Science.gov (United States)

    Sohn, Jung Heob; Cho, Kyoung Rai

    2017-04-01

    The present study reports the clinical features of middle ear barotrauma in student pilots in the Republic of Korea Air Force. The authors reviewed medical records of student pilots with barotrauma. The grade of barotrauma was assigned using Teed's classification. This study included nasal symptoms, endoscopic findings of the nasal cavity, and clinical course (duration, recurrence). The relationship between middle ear barotrauma and the nasal airway was also evaluated. There were 57 cases in 51 pilots included. There were 49 cases (86.0%) that showed unilateral disease and 4 subjects experienced relapse. Two subjects (3.9%) had chronic rhinosinusitis and four subjects (7.8%) had allergic rhinitis. Ear fullness was reported in all cases, while hearing loss and persistent ear pain were reported in 3 cases (5.3%) and 19 cases (33.3%), respectively. Stuffy nose (26 cases, 45.6%) and rhinorrhea (24 cases, 42.1%) were relatively common. Most cases were Grade 0 (23 cases, 40.3%) or Grade III (27 cases, 47.4%) according to Teed's classification. Septal deviation was observed in 12 cases (21.0%), while turbinate hypertrophy was seen in 53 cases (93.0%) and increased nasal discharge in 33 cases (57.9%). The grade of barotrauma varied significantly according to the severity of turbinate hypertrophy and nasal discharge. The mean duration of disease was 6.8 d. Nasal symptoms and endoscopic findings showed some association with the grade and duration of barotrauma. Most cases resolved within a week; however, barotrauma showed persistence or relapse in some cases.Sohn JH, Cho KR. Middle ear barotrauma in student pilots. Aerosp Med Hum Perform. 2017; 88(4):406-412.

  10. Influence of Ear Surface Area on Heat Tolerance of Composite ...

    African Journals Online (AJOL)

    Relative importance of ear surface area on heat tolerance of composite rabbit population was evaluated. The study was conducted during the dry and rainy seasons, climatic data were recorded to obtain categorical heat stress index. Physiological parameters, growth performance, ear length and ear width of the rabbits ...

  11. Acoustic impedances of ear canals measured by impedance tube

    DEFF Research Database (Denmark)

    Ciric, Dejan; Hammershøi, Dorte

    2007-01-01

    During hearing sensitivity tests, the sound field is commonly generated by an earphone placed on a subject ear. One of the factors that can affect the sound transmission in the ear is the acoustic impedance of the ear canal. Its importance is related to the contribution of other elements involved...

  12. The Design and Evaluation of an Artificial Ear.

    Science.gov (United States)

    A wideband artificial ear for the calibration of supraaural audiometric earphones was designed and constructed. The device consisted of three...acoustic impedance measuring device was developed to aid in the evaluation of this artificial ear. Plots of experimentally determined acoustic impedance...of this and other artificial ears are presented and discussed. Comparison of the experimentally determined acoustic impedance of the subject

  13. AETIOLOGICAL AGENTS OF EAR DISCHARGE: A TWO YEAR RE ...

    African Journals Online (AJOL)

    2014-06-01

    Jun 1, 2014 ... SUMMARY. Background: The discharging ear is a common presentation in medical practice affecting all age groups but primarily children. This study shows the current aetiological causes of ear discharge and their antibiograms, data which would guide empirical treat- ment of ear infections, and also form ...

  14. Ear-related problems among children attending the paediatric and ...

    African Journals Online (AJOL)

    2006-08-31

    Aug 31, 2006 ... terna(10.1%), hearing impairment (7.3%) and foreign body in the ear (5.7%) were the most commonly diagnosed ear-related problems. Conclusion: Ear-related problems among children presenting at the UNTH Enugu were not uncommon. However, otitis me- dia was the most commonly diagnosed ailment ...

  15. Bacteriology of chronic discharging ears in Port Harcourt, Nigeria ...

    African Journals Online (AJOL)

    Methods: Ear swabs of discharging ears aseptically collected from 102 patients of various age groups attending Ear, Nose, and Throat out-patient clinic at University of Port Harcourt Teaching Hospital were cultured for bacterial agents using blood agar, chocolate agar and MacConkey agar. Culture plates were incubated ...

  16. Observation of Dog-Ear Regression by Anatomical Location.

    Science.gov (United States)

    Jennings, Thomas A; Keane, James C; Varma, Rajat; Walsh, Stephanie B; Huang, Conway C

    2017-11-01

    When an excision is performed by a method other than elliptical excision, direct primary wound closure can result in standing cones or "dog-ears." In 2008, Lee and colleagues noted that dog-ears of <8 mm in height have a statistically greater tendency to resolve without further surgical correction than larger dog-ears. To stratify dog-ears by anatomic location and inform on the need for correction at the time of surgery. After tumor extirpation, patients were counseled that primary closure of the surgical wound would result in dog-ears at the wound apices. Dog-ears were left uncorrected in participating patients. At 6 months, patients were assessed for resolution of the dog-ears and asked to rate the appearance of the scar. A total of 140 dog-ears were observed in the study period. Anatomical locations included the hand/foot, trunk, limb, and head/neck. Among these dog-ears, 114/140 (81%) showed complete resolution. Patient satisfaction with the scar appearance correlated well with the dog-ear resolution, with most patients rating the appearance of the scar as good to excellent. This study suggests that dog-ears on the hand and dog-ears ≤4 mm on the trunk may be observed without any final cosmetic penalty.

  17. CMS : An exceptional load for an exceptional work site

    CERN Multimedia

    2001-01-01

    Components of the CMS vacuum tank have been delivered to the detector assembly site at Cessy. The complete inner shell was delivered to CERN by special convoy while the outer shell is being assembled in situ. The convoy transporting the inner shell of the CMS vacuum tank took a week to cover the distance between Lons-le-Saunier and Point 5 at Cessy. Left: the convoy making its way down from the Col de la Faucille. With lights flashing, flanked by police outriders and with roads temporarily closed, the exceptional load that passed through the Pays de Gex on Monday 20 May was accorded the same VIP treatment as a leading state dignitary. But this time it was not the identity of the passenger but the exceptional size of the object being transported that made such arrangements necessary. A convoy of two lorries was needed to transport the load, an enormous 13-metre long, 6 metre diameter cylinder weighing 120 tonnes. It took a week to cover the 120 kilometres between Lons-le-Saunier and the assembly site for...

  18. Anthropometric growth study of the ear in a Chinese population.

    Science.gov (United States)

    Zhao, Shichun; Li, Dianguo; Liu, Zhenzhong; Wang, Yibiao; Liu, Lei; Jiang, Duyin; Pan, Bo

    2017-10-20

    A large number of anthropometric studies of the auricle have been reported in different nations, but little data were available in the Chinese population. The aim of this study was to analyze growth changes in the ear by measuring the width and length of ears in a Chinese population. A total of 480 participants were enrolled and classified into 1-, 3-, 5-, 7-, 9-, 12-, 14-, and 18-year groups (half were boys and half were girls in each group). Ear length, ear width, body weight, and body length were measured and recorded; ear index was calculated according to ear length and ear width. The growth of auricle and differences between genders were analyzed. Growth of ear in relation to body height and weight and the degree of emphasis on the length and width of the auricle were also analyzed. Ear length and width increased with age. Ear length achieved its mature size in both 14-year-old males and females. Ear width reached its mature size in males at 7 years and in females at 5 years. Different trends of ear index were shown between males and females. People in this population paid more attention to the length than the width of the auricle. The data indicated that ear development followed increase in age. There were gender and ethnic difference in the development of ear. These results may have potential implications for the diagnosis of congenital malformations, syndromes, and planning of ear reconstruction surgery. Copyright © 2017 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.

  19. Exceptional groups from open strings

    OpenAIRE

    Gaberdiel, Matthias R.; Zwiebach, Barton

    1997-01-01

    We consider type IIB theory compactified on a two-sphere in the presence of mutually nonlocal 7-branes. The BPS states associated with the gauge vectors of exceptional groups are seen to arise from open strings connecting the 7-branes, and multi-pronged open strings capable of ending on more than two 7-branes. These multi-pronged strings are built from open string junctions that arise naturally when strings cross 7-branes. The different string configurations can be multiplied as traditional o...

  20. Exceptional Family Member Program EFM

    Science.gov (United States)

    1996-01-01

    patient facilities. e6 Points of Contact for the Exceptional Family Member Program ’ American Cleft Palate National Association for Foundation Alzheimer’s 1...area, D 0 Contact the Easter Seal Society regarding the Early Intervention Program for infants with special needs. 3 0 "!i I . . Other’Resources...800-24- CLEFT - (412) 481-1370 1-800-272-3900 -- (312) 335-8700 American Liver Foundation National Cancer Institute 1-800-223-0171) - (201) 256-2550 1

  1. Exceptional geometry and Borcherds superalgebras

    Energy Technology Data Exchange (ETDEWEB)

    Palmkvist, Jakob [Mitchell Institute for Fundamental Physics and Astronomy, Texas A& M University,College Station, TX 77843 (United States)

    2015-11-05

    We study generalized diffeomorphisms in exceptional geometry with U-duality group E{sub n(n)} from an algebraic point of view. By extending the Lie algebra e{sub n} to an infinite-dimensional Borcherds superalgebra, involving also the extension to e{sub n+1}, the generalized Lie derivatives can be expressed in a simple way, and the expressions take the same form for any n≤7. The closure of the transformations then follows from the Jacobi identity and the grading of e{sub n+1} with respect to e{sub n}.

  2. Exceptional geometry and Borcherds superalgebras

    Science.gov (United States)

    Palmkvist, Jakob

    2015-11-01

    We study generalized diffeomorphisms in exceptional geometry with U-duality group E n( n) from an algebraic point of view. By extending the Lie algebra {e}_n to an infinite-dimensional Borcherds superalgebra, involving also the extension to {e}_{n+1} , the generalized Lie derivatives can be expressed in a simple way, and the expressions take the same form for any n ≤ 7. The closure of the transformations then follows from the Jacobi identity and the grading of {e}_{n+1} with respect to {e}_n.

  3. Characterization of the n_TOF EAR-2 neutron beam

    Science.gov (United States)

    Chen, Y. H.; Tassan-Got, L.; Audouin, L.; Le Naour, C.; Durán, I.; Casarejos, E.; Aberle, O.; Andrzejewski, J.; Bécares, V.; Bacak, M.; Balibrea, J.; Barbagallo, M.; Barros, S.; Bečvář, F.; Beinrucker, C.; Berthoumieux, E.; Billowes, J.; Bosnar, D.; Brugger, M.; Caamaño, M.; Calviño, F.; Calviani, M.; Cano-Ott, D.; Cardella, R.; Casanovas, A.; Castelluccio, D. M.; Cerutti, F.; Chiaveri, E.; Colonna, N.; Cortés, G.; Cortés-Giraldo, M. A.; Cosentino, L.; Damone, L. A.; Diakaki, M.; Domingo-Pardo, C.; Dressler, R.; Dupont, E.; Fernández-Domínguez, B.; Ferrari, A.; Ferreira, P.; Finocchiaro, P.; Furman, V.; Göbel, K.; Gómez-Hornillos, M. B.; García, A. R.; Gawlik, A.; Glodariu, T.; Gonçalves, I. F.; González, E.; Goverdovski, A.; Griesmayer, E.; Guerrero, C.; Gunsing, F.; Harada, H.; Heftrich, T.; Heinitz, S.; Heyse, J.; Jenkins, D. G.; Jericha, E.; Käppeler, F.; Kadi, Y.; Katabuchi, T.; Kavrigin, P.; Ketlerov, V.; Khryachkov, V.; Kimura, A.; Kivel, N.; Kokkoris, M.; Krtička, M.; Leal-Cidoncha, E.; Lederer, C.; Leeb, H.; Lerendegui-Marco, J.; Meo, S. Lo; Lonsdale, S. J.; Losito, R.; Macina, D.; Marganiec, J.; Martínez, T.; Massimi, C.; Mastinu, P.; Mastromarco, M.; Matteucci, F.; Maugeri, E. A.; Mendoza, E.; Mengoni, A.; Milazzo, P. M.; Mingrone, F.; Mirea, M.; Montesano, S.; Musumarra, A.; Nolte, R.; Oprea, A.; Patronis, N.; Pavlik, A.; Perkowski, J.; Porras, J. I.; Praena, J.; Quesada, J. M.; Rajeev, K.; Rauscher, T.; Reifarth, R.; Riego-Perez, A.; Robles, M.; Rout, P. C.; Rubbia, C.; Ryan, J. A.; Sabaté-Gilarte, M.; Saxena, A.; Schillebeeckx, P.; Schmidt, S.; Schumann, D.; Sedyshev, P.; Smith, A. G.; Stamatopoulos, A.; Tagliente, G.; Tain, J. L.; Tarifeño-Saldivia, A.; Tsinganis, A.; Valenta, S.; Vannini, G.; Variale, V.; Vaz, P.; Ventura, A.; Vlachoudis, V.; Vlastou, R.; Wallner, A.; Warren, S.; Weigand, M.; Weiss, C.; Wolf, C.; Woods, P. J.; Wright, T.; Žugec, P.

    2017-09-01

    The experimental area 2 (EAR-2) at CERNs neutron time-of-flight facility (n_TOF), which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1). The Parallel Plate Avalanche Counter (PPAC) monitor experiment was performed to characterize the beam pro↓le and the shape of the neutron 'ux at EAR-2. The prompt γ-flash which is used for calibrating the time-of-flight at EAR-1 is not seen by PPAC at EAR-2, shedding light on the physical origin of this γ-flash.

  4. Characterization of the n_TOF EAR-2 neutron beam

    Directory of Open Access Journals (Sweden)

    Chen Y.H.

    2017-01-01

    Full Text Available The experimental area 2 (EAR-2 at CERNs neutron time-of-flight facility (n_TOF, which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1. The Parallel Plate Avalanche Counter (PPAC monitor experiment was performed to characterize the beam pro↓le and the shape of the neutron 'ux at EAR-2. The prompt γ-flash which is used for calibrating the time-of-flight at EAR-1 is not seen by PPAC at EAR-2, shedding light on the physical origin of this γ-flash.

  5. Loops in exceptional field theory

    Energy Technology Data Exchange (ETDEWEB)

    Bossard, Guillaume [Centre de Physique Théorique, Ecole Polytechnique, CNRS, Université Paris-Saclay,91128 Palaiseau cedex (France); Kleinschmidt, Axel [Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut),Am Mühlenberg 1, DE-14476 Potsdam (Germany); International Solvay Institutes,ULB-Campus Plaine CP231, BE-1050 Brussels (Belgium)

    2016-01-27

    We study certain four-graviton amplitudes in exceptional field theory in dimensions D≥4 up to two loops. As the formulation is manifestly invariant under the U-duality group E{sub 11−D}(ℤ), our resulting expressions can be expressed in terms of automorphic forms. In the low energy expansion, we find terms in the M-theory effective action of type R{sup 4}, ∇{sup 4}R{sup 4} and ∇{sup 6}R{sup 4} with automorphic coefficient functions in agreement with independent derivations from string theory. This provides in particular an explicit integral formula for the exact string theory ∇{sup 6}R{sup 4} threshold function. We exhibit moreover that the usual supergravity logarithmic divergences cancel out in the full exceptional field theory amplitude, within an appropriately defined dimensional regularisation scheme. We also comment on terms of higher derivative order and the role of the section constraint for possible counterterms.

  6. Diseases of the middle ear in childhood

    Science.gov (United States)

    Minovi, Amir; Dazert, Stefan

    2014-01-01

    Middle ear diseases in childhood play an important role in daily ENT practice due to their high incidence. Some of these like acute otitis media or otitis media with effusion have been studied extensively within the last decades. In this article, we present a selection of important childhood middle ear diseases and discuss the actual literature concerning their treatment, management of complications and outcome. Another main topic of this paper deals with the possibilities of surgical hearing rehabilitation in childhood. The bone-anchored hearing aid BAHA® and the active partially implantable device Vibrant Soundbridge® could successfully be applied for children. In this manuscript, we discuss the actual literature concerning clinical outcomes of these implantable hearing aids. PMID:25587371

  7. Ultrastructural morphology of a middle ear ceruminoma.

    Science.gov (United States)

    Schenk, Peter; Handisurya, Alessandra; Steurer, Martin

    2002-01-01

    The ultrastructural morphology of a ceruminous gland adenoma in the middle ear was examined electron microscopically. The epithelial tumor cells displayed apocrine caps, microvilli, cell junctions, secretory granules, vacuoles, lipid droplets and siderosomes, which are the characteristic ultrastructural features of apocrine glands. Concentric membranous bodies of the endoplasmic reticulum, phagocytic activity of the tumor cells, intracytoplasmic lumina, ciliated cells and also spiny collagen in the tumor stroma could be seen. The myoepithelial cells are an important tumor marker in the differential diagnosis between ceruminomas and adenomas of the middle ear. The ectopic origin in the modified apocrine ceruminous glands, the specific localization, the clinical features and the extremely rare occurrence of the ceruminoma makes this tumor a unique neoplastic entity. Copyright 2002 S. Karger AG, Basel

  8. ONTOGENY OF THE DIET IN ANURANS (AMPHIBIA COLLECTED AT LA VIEJA RIVER BASIN IN THE DEPARMENTO OF QUINDIO (COLOMBIA

    Directory of Open Access Journals (Sweden)

    SERGIO ENRIQUE MORENO-BARBOSA

    2014-12-01

    Full Text Available The diet of three anuran species, Rhinella marina (Bufonidae, Pristimantis achatinus (Strabomantidae and Dendropsophus columbianus (Hylidae, that inhabit agroecosystems at the Rio La Vieja Basin (Quindio, Colombia was examined. The goal of this study was to establish if there is an ontogenetic change in the diet of all species. Gastrointestinal contents were preserved in 70% ethanol and identified to the lowest possible taxonomic level. Identified prey portions were classified into 20 types. Hymenoptera, Coleoptera and Hemiptera were the most frequent preys. Considerable dietary overlap among three different body-size classes of all species show some differences. However the ANOVA analysis showed that there was no significant difference (P=0.05 in diets at different ontogenetic sizes.

  9. Sem studies of the inflammatory changes of the middle ear mucosa.

    Science.gov (United States)

    Shimooka, R; Yajin, K; Harada, Y

    1983-01-01

    Mucosal specimens of the middle ear from patients who had chronic otitis media were studied and compared with normal middle ear specimens using a scanning electron microscope. The epithelia in chronic otitis media were usually thick and those surface structures varied depending on the area in which the biopsy was taken. Moreover, the structure was not uniform even in the same specimen. Some areas showed a great number of secretory cells, while others demonstrated high population of ciliated cells. Areas with loss of the superficial layer were also observed in a few cases. There were less ciliated cells than we expected. They were not evenly distributed, except for the eustachian tube region. Morphologically, most of these ciliated cells seemed to be normal, and a few isolated atrophic ones were also observed. In cholesteatoma cases, squamous epithelia with desquamating, flat and keratinized cells were observed.

  10. Body lift, drag and power are relatively higher in large-eared than in small-eared bat species

    DEFF Research Database (Denmark)

    Håkansson, Jonas; Jakobsen, Lasse; Hedenström, Anders

    2017-01-01

    than previously assumed and that the large-eared species has a higher body drag coefficient, but also produces relatively more ear/body lift than the small-eared species, in line with prior studies on model bats. The measured aerodynamic power of P. auritus was higher than predicted from...... mitigate the cost by producing aerodynamic lift. Here we compare quantitative aerodynamic measures of flight efficiency of two bat species, one large-eared (Plecotus auritus) and one small-eared (Glossophaga soricina), flying freely in a wind tunnel. We find that the body drag of both species is higher...

  11. [Preoperative CT Scan in middle ear cholesteatoma].

    Science.gov (United States)

    Sethom, Anissa; Akkari, Khemaies; Dridi, Inès; Tmimi, S; Mardassi, Ali; Benzarti, Sonia; Miled, Imed; Chebbi, Mohamed Kamel

    2011-03-01

    To compare preoperative CT scan finding and per-operative lesions in patients operated for middle ear cholesteatoma, A retrospective study including 60 patients with cholesteatoma otitis diagnosed and treated within a period of 5 years, from 2001 to 2005, at ENT department of Military Hospital of Tunis. All patients had computed tomography of the middle and inner ear. High resolution CT scan imaging was performed using millimetric incidences (3 to 5 millimetres). All patients had surgical removal of their cholesteatoma using down wall technic. We evaluated sensitivity, specificity and predictive value of CT-scan comparing otitic damages and CT finding, in order to examine the real contribution of computed tomography in cholesteatoma otitis. CT scan analysis of middle ear bone structures shows satisfaction (with 83% of sensibility). The rate of sensibility decrease (63%) for the tympanic raff. Predictive value of CT scan for the diagnosis of cholesteatoma was low. However, we have noticed an excellent sensibility in the analysis of ossicular damages (90%). Comparative frontal incidence seems to be less sensible for the detection of facial nerve lesions (42%). But when evident on CT scan findings, lesions of facial nerve were usually observed preoperatively (spécificity 78%). Predictive value of computed tomography for the diagnosis of perilymphatic fistulae (FL) was low. In fact, CT scan imaging have showed FL only for four patients among eight. Best results can be obtained if using inframillimetric incidences with performed high resolution computed tomography. Preoperative computed tomography is necessary for the diagnosis and the evaluation of chronic middle ear cholesteatoma in order to show extending lesion and to detect complications. This CT analysis and surgical correlation have showed that sensibility, specificity and predictive value of CT-scan depend on the anatomic structure implicated in cholesteatoma damages.

  12. Mouse middle ear ion homeostasis channels and intercellular junctions.

    Directory of Open Access Journals (Sweden)

    Lisa M Morris

    Full Text Available The middle ear contains homeostatic mechanisms that control the movement of ions and fluids similar to those present in the inner ear, and are altered during inflammation.The normal middle ear cavity is fluid-free and air-filled to allow for effective sound transmission. Within the inner ear, the regulation of fluid and ion movement is essential for normal auditory and vestibular function. The same ion and fluid channels active in the inner ear may have similar roles with fluid regulation in the middle ear.Middle and inner ears from BALB/c mice were processed for immunohistochemistry of 10 specific ion homeostasis factors to determine if similar transport and barrier mechanisms are present in the tympanic cavity. Examination also was made of BALB/c mice middle ears after transtympanic injection with heat-killed Haemophilus influenza to determine if these channels are impacted by inflammation.The most prominent ion channels in the middle ear included aquaporins 1, 4 and 5, claudin 3, ENaC and Na(+,K(+-ATPase. Moderate staining was found for GJB2, KCNJ10 and KCNQ1. The inflamed middle ear epithelium showed increased staining due to expected cellular hypertrophy. Localization of ion channels was preserved within the inflamed middle ear epithelium.The middle ear epithelium is a dynamic environment with intrinsic mechanisms for the control of ion and water transport to keep the middle ear clear of fluids. Compromise of these processes during middle ear disease may underlie the accumulation of effusions and suggests they may be a therapeutic target for effusion control.

  13. Desiccation risk drives the spatial ecology of an invasive anuran (Rhinella marina) in the Australian semi-desert.

    Science.gov (United States)

    Tingley, Reid; Shine, Richard

    2011-01-01

    Some invasive species flourish in places that impose challenges very different from those faced in their native geographic ranges. Cane toads (Rhinella marina) are native to tropical and subtropical habitats of South and Central America, but have colonised extremely arid regions over the course of their Australian invasion. We radio-tracked 44 adult cane toads at a semi-arid invasion front to investigate how this invasive anuran has managed to expand its geographic range into arid areas that lie outside of its native climatic niche. As predicted from their low physiological control over rates of evaporative water loss, toads selected diurnal shelter sites that were consistently cooler and damper (and thus, conferred lower water loss rates) than nearby random sites. Desiccation risk also had a profound influence on rates of daily movement. Under wet conditions, toads that were far from water moved further between shelter sites than did conspecifics that remained close to water, presumably in an attempt to reach permanent water sources. However, this relationship was reversed under dry conditions, such that only toads that were close to permanent water bodies made substantial daily movements. Toads that were far from water bodies also travelled along straighter paths than did conspecifics that generally remained close to water. Thus, behavioural flexibility--in particular, an ability to exploit spatial and temporal heterogeneity in the availability of moist conditions--has allowed this invasive anuran to successfully colonize arid habitats in Australia. This finding illustrates that risk assessment protocols need to recognise that under some circumstances an introduced species may be able to thrive in conditions far removed from any that it experiences in its native range.

  14. Desiccation risk drives the spatial ecology of an invasive anuran (Rhinella marina in the Australian semi-desert.

    Directory of Open Access Journals (Sweden)

    Reid Tingley

    Full Text Available Some invasive species flourish in places that impose challenges very different from those faced in their native geographic ranges. Cane toads (Rhinella marina are native to tropical and subtropical habitats of South and Central America, but have colonised extremely arid regions over the course of their Australian invasion. We radio-tracked 44 adult cane toads at a semi-arid invasion front to investigate how this invasive anuran has managed to expand its geographic range into arid areas that lie outside of its native climatic niche. As predicted from their low physiological control over rates of evaporative water loss, toads selected diurnal shelter sites that were consistently cooler and damper (and thus, conferred lower water loss rates than nearby random sites. Desiccation risk also had a profound influence on rates of daily movement. Under wet conditions, toads that were far from water moved further between shelter sites than did conspecifics that remained close to water, presumably in an attempt to reach permanent water sources. However, this relationship was reversed under dry conditions, such that only toads that were close to permanent water bodies made substantial daily movements. Toads that were far from water bodies also travelled along straighter paths than did conspecifics that generally remained close to water. Thus, behavioural flexibility--in particular, an ability to exploit spatial and temporal heterogeneity in the availability of moist conditions--has allowed this invasive anuran to successfully colonize arid habitats in Australia. This finding illustrates that risk assessment protocols need to recognise that under some circumstances an introduced species may be able to thrive in conditions far removed from any that it experiences in its native range.

  15. The glue ear 'epidemic': a historical perspective.

    Science.gov (United States)

    Alderson, David

    2011-12-01

    This paper explores the historical context of the dramatic rise in surgery for glue ear in the mid-20th century, and questions the published assertion that this represented a manufactured 'epidemic'. In examining historical sources, the reader's theoretical viewpoint greatly influences their conclusions: the sustained rise in treatment for glue ear may be seen as the advance of science in a golden age or the resistance of insular professionals to reason in the light of new scientific study methods. Current views on the practice of medicine, consumerism, science and standardisation, rationing and the nature of 'truth' all affect the way that we see this period. Technological advances clearly allowed better diagnosis and more effective treatment, but these did not appear to drive an 'epidemic', rather they were developed to meet the pre-existing challenges of otological practice. The proposition that an 'epidemic' was created does not appear to have any solid grounding. Society's perception of what constitutes disease and what needs treatment may have evolved, but the prevalence of other important diseases changed dramatically over this time period, and a real change in the epidemiology of glue ear cannot be dismissed. In defining the case for and against surgical treatment, a solely positivist, quantitative worldview cannot give us a complete picture of benefit and risk to individuals, families and society at large.

  16. Why Do Elephants Flap Their Ears?

    Science.gov (United States)

    Koffi, Moise; Jiji, Latif; Andreopoulos, Yiannis

    2009-11-01

    It is estimated that a 4200 kg elephant generates as much as 5.12 kW of heat. How the elephant dissipates its metabolic heat and regulates its body temperature has been investigated during the past seven decades. Findings and conclusions differ sharply. The high rate of metabolic heat coupled with low surface area to volume ratio and the absence of sweat glands eliminate surface convection as the primary mechanism for heat removal. Noting that the elephant ears have high surface area to volume ratio and an extensive vascular network, ear flapping is thought to be the principal thermoregulatory mechanism. A computational and experimental program is carried out to examine flow and heat transfer characteristics. The ear is modeled as a uniformly heated oscillating rectangular plate. Our computational work involves a three-dimensional time dependent CFD code with heat transfer capabilities to obtain predictions of the flow field and surface temperature distributions. This information was used to design an experimental setup with a uniformly heated plate of size 0.2m x 0.3m oscillating at 1.6 cycles per second. Results show that surface temperature increases and reaches a steady periodic oscillation after a period of transient oscillation. The role of the vortices shed off the plate in heat transfer enhancement will be discussed.

  17. Middle ear mucosa in rats and humans.

    Science.gov (United States)

    Albiin, N; Hellström, S; Stenfors, L E; Cerne, A

    1986-01-01

    The purposes of the study were to review thoroughly the literature and summarize it in a standardized fashion; to study the mucosa, including the distribution of mast cells, in all parts of the middle ear cavity in rats; and to compare the experimental findings with those known in humans. Adult, healthy rats were studied by light, scanning electron, and transmission electron microscopic techniques. The ciliated and secretory cells of the rat tympanic cavity are confined to two tracts, one anterior and one inferoposterior to the promontory. The tracts connect the epitympanum with the eustachian tube. The pars flaccida exhibits the highest density of mast cells, but mast cells are also distributed in the subepithelial layer of the tracts and in the floor of the tympanic bulla. The structure of the rat mucosa shows striking similarities to that of humans. Thus, from a morphological point of view, the rat seems to be a suitable model for middle ear studies. However, to be able to compare results obtained in different species and/or different laboratories, the areas of the middle ear from which the specimens have been taken must be carefully defined and presented in a standardized manner.

  18. Effects of Carriers, Emulsifiers, and Biopesticides for Direct Silk Treatments on Caterpillar Feeding Damage and Ear Development in Sweet Corn.

    Science.gov (United States)

    Westgate, P J; Schultz, B B; Hazzard, R V

    2017-04-01

    In the northeastern United States, control of Lepidopteran pests of sweet corn, particularly corn earworm [Helicoverpa zea (Boddie)], is difficult using organic methods. The direct application of corn oil and Bacillus thuringiensis (Bt) to corn silk has been shown to reduce ear damage from corn earworm in past studies; these studies sought to optimize this method by evaluating additional carrier and biopesticide mixtures that comply with the United States Federal Insecticide, Fungicide, and Rodenticide Act and National Organic Standards. Carriers, which are liquids used to dissolve the biopesticide and deliver it into the tip of the ear, may have phytotoxic or insecticidal properties. Experiments conducted from 2001 to 2005 evaluated caterpillar damage and ear development effects from carriers (vegetable and paraffinic oils and carrageenan), biopesticides (Bt, spinsosad, and neem), and three emulsifiers in various combinations when applied directly to the tips of the ears 5-7 d after silk initiation. There were no effects of emulsifiers on ear quality, except for slight reduction in caterpillar damage in one of the two years. There were no differences among corn, soy, canola, and safflower oils in corn earworm control or tip development. The carrageenan carrier had the least effect upon ear development as measured by the length of nonpollinated kernels at the tip, compared to corn oil or paraffinic oil (JMS Stylet Oil), which caused the greatest tip damage as well as an oily discoloration. The carrier-pesticide combinations with the best ear quality overall were spinosad in carrageenan or corn oil, and Bt in carrageenan. © The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

  19. 42 CFR 423.578 - Exceptions process.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Exceptions process. 423.578 Section 423.578 Public..., Redeterminations, and Reconsiderations § 423.578 Exceptions process. (a) Requests for exceptions to a plan's tiered... sponsor may design its exception process so that very high cost or unique drugs are not eligible for a...

  20. Endoscopic Ear Surgery: Critical Review of Anatomy and Physiology of Normal and Reconstructive Middle Ear.

    Science.gov (United States)

    Udagatti, Vithal D; Dinesh Kumar, Rajendran

    2016-06-01

    Middle ear anatomy is complex hence it is difficult to study the microscopic vibration of tympanic membrane and ossicles. The basic research has been done in few centres. Our experience is based on clinical data. The lack of quantitative understanding of structural and functional relationship in the mechanical response of the normal and reconstructed middle ear is major factor in poor hearing results after surgery (Merchant et al. in J Laryngol Otol 112:715-731, 1998). The vibration pattern of tympanic membrane changes with different frequencies. It depends upon shape, position and tension of tympanic membrane. Sometimes reconstructed tympanic membrane loses its shape and tension and thus its vibratory response (Pusalkar and Steinbach in Transplants and implants in otology II, 1992). Then what should be the shape, position, tension of the tympanic membrane and the ossicles. In order to have a serviceable hearing, dry and safe ear, there is a necessity of answering all these queries by us.

  1. TOTAL EAR RECONSTRUCTION WITH MONOBLOCK CARTILAGE AND TEMPOROPARIETAL FASCIA

    Directory of Open Access Journals (Sweden)

    Rajendra Prasad

    2015-09-01

    Full Text Available BACKGROUND : Microtia is a congenital ear deformity with incidence of 1:6000. Anotia can be of traumatic origin also. It is one of the greatest challenges to the plastic surgeon to the reconstruct the ear from autologus material . Various developments have occurred in the ear reconstruction from the era of Tanzer. It can be done in a single stage or multiple stages. Single stage ear reconstruction require technical precision, avoids multiple admission of the patient. MATERIAL AND M ETHOD : Between 2007 to 2013 six cases of total ear reconstruction was done in two stage method using autologus coastal cartilage in the department of M.K.C.G medical college by a single surgeon. In the first stage lobule rotation, fabrication of the cartil aginous framework and its implantation were performed. In the second stage elevation of the auricle and formation of tragus was done. All of them underwent stage 1 procedure among them 2 had not turned up for staged 2 procedure. RESULT S: 4 were females and 2 were male. 4 had congenital microtia and two were traumatic amputation of the ear. All had unilateral microtia. The follow up was done for up to 1 year. CONCLUSION: One patient had lost follow up.5 patient had unacceptable ear. Though it is impossible t o reconstruct ear that appear exactly the same as opposite ear , the new ears which were made of correct size and in normal position

  2. Alterations in the Contra lateral Ear in Chronic Otitis Media

    Directory of Open Access Journals (Sweden)

    Mohammad Ali Damghani

    2013-03-01

    Full Text Available Introduction: Chronic otitis media (COM, a persistent and durable inflammation and infection of the middle ear, is a common disorder. Alterations in the contralateral ear in sufferers have been observed in recent years. Because only a few studies have been reported in this area, we performed this study in order to assess alterations in the contralateral ear of patients with COM.   Materials and Methods: Cross-sectional and descriptive methods were used in 100 patients with COM who were selected for surgical treatment and admitted to hospital. An information form was completed for all patients including demographic data, medical history of otoscopy and paraclinical examinations such as pure tone audiometry (PTA, tympanometry, Schuller radiography, and high resolution computed tomography (HRCT. All data were processed using SPSS (version 18 software and descriptive statistical tests.   Results: According to otoscopy, PTA, tympanometry and graphical analysis, 60% of patients experienced disorders of the contralateral ear. Otoscopy analysis showed 54% of patients had a disorder of the contralateral ear, with the most common disorder being perforation of the ear drum. PTA showed a 48% incidence of contralateral ear problems (85% conductive hearing impairment; 12.5% sensorineural hearing impairment; 1.2% mixed. A total of 73.2% of patients with conductive hearing loss had a problem across all frequencies, while half of the patients with sensorineural hearing impairment had problems at frequencies greater than 1000 Hz. According to tympanometry, 38% of patients had problem in the contralateral ear. HRCT and Schuller graphical analyses indicated 31.5% and 36% occurrence of contralateral ear disorders, respectively.   Conclusion:  More than 50% of patients with COM in one ear have a chance of also presenting with the disease in the other ear. Outcomes of this study and previous studies have shown that COM should not be perceived as a disease limited

  3. Light Stops at Exceptional Points

    Science.gov (United States)

    Goldzak, Tamar; Mailybaev, Alexei A.; Moiseyev, Nimrod

    2018-01-01

    Almost twenty years ago, light was slowed down to less than 10-7 of its vacuum speed in a cloud of ultracold atoms of sodium. Upon a sudden turn-off of the coupling laser, a slow light pulse can be imprinted on cold atoms such that it can be read out and converted into a photon again. In this process, the light is stopped by absorbing it and storing its shape within the atomic ensemble. Alternatively, the light can be stopped at the band edge in photonic-crystal waveguides, where the group speed vanishes. Here, we extend the phenomenon of stopped light to the new field of parity-time (P T ) symmetric systems. We show that zero group speed in P T symmetric optical waveguides can be achieved if the system is prepared at an exceptional point, where two optical modes coalesce. This effect can be tuned for optical pulses in a wide range of frequencies and bandwidths, as we demonstrate in a system of coupled waveguides with gain and loss.

  4. What Shapes the Phylogenetic Structure of Anuran Communities in a Seasonal Environment? The Influence of Determinism at Regional Scale to Stochasticity or Antagonistic Forces at Local Scale.

    Science.gov (United States)

    Martins, Clarissa de Araújo; Roque, Fabio de Oliveira; Santos, Bráulio A; Ferreira, Vanda Lúcia; Strüssmann, Christine; Tomas, Walfrido Moraes

    2015-01-01

    Ecological communities are structured by both deterministic and stochastic processes. We investigated phylogenetic patterns at regional and local scales to understand the influences of seasonal processes in shaping the structure of anuran communities in the southern Pantanal wetland, Brazil. We assessed the phylogenetic structure at different scales, using the Net Relatedness Index (NRI), the Nearest Taxon Index (NTI), and phylobetadiversity indexes, as well as a permutation test, to evaluate the effect of seasonality. The anuran community was represented by a non-random set of species with a high degree of phylogenetic relatedness at the regional scale. However, at the local scale the phylogenetic structure of the community was weakly related with the seasonality of the system, indicating that oriented stochastic processes (e.g. colonization, extinction and ecological drift) and/or antagonist forces drive the structure of such communities in the southern Pantanal.

  5. Ciliary activity of the middle ear lining in guinea pigs.

    Science.gov (United States)

    Ohashi, Y; Nakai, Y; Kihara, S

    1985-01-01

    Since the middle ear lining is an extension and a modification of the respiratory epithelium, it is conceivable that it has a mucociliary system and plays an important role in clearing the middle ear cavity. It has already been noted in morphological investigations that the middle ear mucosa has ciliated cells. To our knowledge, however, ciliary activity has never been observed directly. In our research, we used the photoelectric method to study ciliary activity of the middle ear mucosa directly and quantitatively. We made special reference to the frequency of ciliary beating at various sites within the middle ear cavity. Ciliary activity was found to exist in the eustachian tube and the middle ear, the same as in other respiratory organs, and this activity was stronger in cells distal to the eustachian tube.

  6. [Diagnostic value of high-resolution computed tomography imaging in congenital inner ear malformations].

    Science.gov (United States)

    Sun, Xiaowei; Ding, Yuanping; Zhang, Jianji; Chen, Ying; Xu, Anting; Dou, Fenfen; Zhang, Zihe

    2007-02-01

    To observe the inner ear structure with volume rendering (VR) reconstruction and to evaluate the role of high-resolution computed tomography (HRCT) in congenital inner ear malformations. HRCT scanning was performed in 10 patients (20 ears) without ear disease (control group) and 7 patients (11 ears) with inner ear malformations (IEM group) and the original data was processed with VR reconstruction. The inner ear osseous labyrinth structure in the images generated by these techniques was observed respectively in the normal ears and malformation ears. The inner ear osseous labyrinth structure and the relationship was displayed clearly in VR imaging in the control group,meanwhile, characters and degree of malformed structure were also displayed clearly in the IEA group. Of seven patients (11 ears) with congenital inner ear malformations, the axial, MPR and VR images can display the site and degree in 9 ears. VR images were superior to the axial images in displaying the malformations in 2 ears with the small lateral semicircular canal malformations. The malformations included Mondini deformity (7 ears), vestibular and semicircular canal malformations (3 ears), vestibular aqueduct dilate (7 ears, of which 6 ears accompanied by other malformations) , the internal auditory canal malformation (2 ears, all accompanied by other malformations). HRCT can display the normal structure of bone inner ear through high quality VR reconstructions. VR images can also display the site and degree of the malformations three-dimensionally and intuitively. HRCT is valuable in diagnosing the inner ear malformation.

  7. Reexamining the "Serbian exceptionalism" thesis

    Directory of Open Access Journals (Sweden)

    Vujačić Veljko

    2003-01-01

    Full Text Available Although former Yugoslavia constituted what was widely held to be the most "promising" communist country in terms of potentials for economic reform and political democratization, Serbia remained the only East European country in which the former communist elite managed to defeat its opponents in a series of elections and preserve important elements of institutional and ideological continuity with the old system. Moreover, its regime played a conspicuous role in Yugoslavia's violent collapse. In the specialist literature, the "Serbian exceptionalism" thesis has been elaborated in a number of forms. These are critically reviewed in the first part of the paper, classifying the paradigms according to whether they emphasize: 1 Serbian traditionalist, authoritarian, and collectivist political culture, 2 the affinity between traditional Serbian national populism, Russophile anti-Westernism, and communism, 3 the exclusivist and assimilating character of Serbian nationalism, or 4 the appeals of the contemporary Serbian political elite led by S. Milošević. In the second part of the paper an alternative explanation is presented that seeks to be both interpretively adequate and causally plausible. It rests on five basic factors: 1 historical legacy (the distinctive character of the Serbian collective historical experience and the relationship between Serbian and Yugoslav identities; 2 institutional analysis (the unintended consequences of communist federalism; 3 ideology (the revival of narratives of "Serbian victimization" by Serbian intellectuals; 4 leadership and social base (the peculiar nature of Milošević's appeals in the period of the terminal crisis of communism; and 5 the role of the Diaspora (the perceived ethnic threat among Serbs in Croatia and Bosnia. .

  8. Presbycusis: do we have a third ear?

    Science.gov (United States)

    Reis, Luis Roque; Escada, Pedro

    Age-related hearing changes are the most frequent cause of sensorineural hearing loss in adults. In the literature no studies exist concerning the importance of speechreading in individuals with presbycusis. Equally, no such studies have been carried out with speakers of the Portuguese (Portugal) language. To evaluate whether the intelligibility of words in presbycusis is improved by speechreading, in such a way that looking at the interlocutor's face while he is talking functions like a "third ear", and to determine the statistical relevance of the intelligibility improvement by speechreading. Eleven individuals (22 ears) with bilateral and symmetrical sensorineural hearing loss compatible with presbycusis were evaluated. The subjects were aged between 57 and 82 years, with an average of 70±11.51 years and median of 69.5 years. A complete medical and audiological profile of each patient was created and all patients were submitted to a vocal audiogram, without and with observation of the audiologist's face. A descriptive and analytical statistical analysis was performed (Shapiro-Wilk and t pairs tests) adopting the significance level of 0.05 (5%). We noticed better performance in intelligibility with speechreading. The p-value was zero (p<0.05), so we rejected the null hypothesis, showing that there was statistically significant difference with speechreading; the same conclusion was obtained by analysis of the confidence intervals. Individuals with presbycusis in this study, performed better on spoken word intelligibility when the hearing of those words was associated with speechreading. This phenomenon helps in such a way that observation of the interlocutor's face works like a "third ear". Copyright © 2016 Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial. Published by Elsevier Editora Ltda. All rights reserved.

  9. In vitro fertilization and artificial activation of eggs of the direct-developing anuran Eleutherodactylus coqui

    OpenAIRE

    Toro Esteban; Michael Scott F

    2004-01-01

    Abstract Although much is known about the reproductive biology of pond-breeding frogs, there is comparatively little information about terrestrial-breeding anurans, a highly successful and diverse group. This study investigates the activation and in vitro fertilization of eggs of the Puerto Rican coqui frog obtained by hormonally induced ovulation. We report that spontaneous activation occurs in 34% of eggs, probably in response to mechanical stress during oviposition. Artificial activation, ...

  10. A potential portal flow in the inner ear

    DEFF Research Database (Denmark)

    Friis, Morten; Qvortrup, Klaus

    2007-01-01

    . The endolymphatic sac has been implicated as a potential endocrine gland, which venules drain to the VVA. A reversal of the direction of flow in the VVA toward the inner ear could, through vestibular arteriovenous anastomosis, cause portal circulation in the inner ear. STUDY DESIGN: The authors conducted...... the endolymphatic sac may enter a portal circulation in the inner ear, which could cause disturbances in the endolymph homeostasis and potentially symptoms as seen in Meniere disease....

  11. An abbreviated history of the ear: from Renaissance to present.

    OpenAIRE

    Hachmeister, Jorge E.

    2003-01-01

    In this article we discuss important discoveries in relation to the anatomy and physiology of the ear from Renaissance to present. Before the Renaissance, there was a paucity of knowledge of the anatomy of the ear, because of the relative inaccessibility of the temporal bone and the general perception that human dissections should not be conducted. It was not until the sixteenth century that the middle ear was described with detail. Further progress would be made between the sixteenth and eig...

  12. Penetration of ceftibuten into middle ear fluid.

    OpenAIRE

    Lin, C; Kumari, P; Perrotta, R J; Reidenberg, B E

    1996-01-01

    The penetration of ceftibuten, an extended-spectrum oral cephalosporin, into middle ear fluid (MEF) was evaluated in pediatric patients during a course of daily oral doses of 9 mg/kg of body weight for 10 days. Plasma and MEF collected at 2, 4, 6, or 12 h after at least 3 days of dosing were analyzed for ceftibuten by a high-pressure liquid chromatography method, and the data were used to calculate pharmacokinetic parameters. Plasma and MEF had almost identical maximum concentrations (Cmax) o...

  13. Autoimmune Inner Ear Disease- A Clinical Viewpoint

    Directory of Open Access Journals (Sweden)

    Amirala Khalessi

    2010-10-01

    Full Text Available Recent developments in medicine have given us a better insight into a group of disorders known as autoimmune diseases. In particular, advances have occurred in our understanding of the Autoimmune Inner Ear Disease (AIED. In this article, the authors review the different postulated theories in the pathogenesis of this disease. The clinical presentation, the available para-clinical diagnostic tools, and the important differential diagnoses will be summarized. The management methods, including steroid therapy, immunosuppressive medications, other biological agents and intra-tympanic injections, will be addressed. Cochlear implantation as a final solution to the advanced stages of the disease, causing total deafness, will also be discussed.

  14. Treating common ear problems in pregnancy: what is safe?

    Science.gov (United States)

    Vlastarakos, Petros V; Nikolopoulos, Thomas P; Manolopoulos, Leonidas; Ferekidis, Eleftherios; Kreatsas, George

    2008-02-01

    In everyday practise, more than 80% of pregnant women receive one at least medication, often for ENT causes. The aim of the present paper is to review the literature on safety and administration of medical treatment for ear diseases, in pregnant women. The literature review includes Medline and database sources. Electronic links, related books and written guidelines were also included. The study selection was as follows: controlled clinical trials, prospective trials, case-control studies, laboratory studies, clinical reviews, systematic reviews, metanalyses, and case reports. The following drugs are considered relatively safe: beta-lactam antibiotics (with dose adjustment), macrolides (although the use of erythromycin and clarithromycin carries a certain risk), and acyclovir. Non-selective NSAIDs (until the 32nd week), nasal decongestants (with caution and up to 7 days), intranasal corticosteroids, with budesonide as the treatment of choice, first generation antihistamines, or cetirizine (third trimester) and loratadine (second and third trimester) from the second generation, H2 receptor antagonists (except nizatidine) and proton pump inhibitors (except omeprazole), can be used to relieve patients from the related symptoms. Meclizine and dimenhydrinate, as antiemetics in vertigo attacks; metoclopramide, vitamin B6 and ginger rhizome, alternatively. Low-dose diazepam and diuretics in severe cases of Meniere's disease (with caution). Systemic administration of prednisone and prednisolone can be considered in selected cases. By contrast, selective COX-2 inhibitors, betahistine and vasodilating agents are contraindicated in pregnancy. Since otologic and neurotologic manifestations during pregnancy tend to seriously affect the quality of life of the expectant mothers, ENT surgeons should familiarise themselves with the basic guidelines and safety precautions for any related medication, in order to provide appropriate treatment.

  15. Dissecting the frog inner ear with Gaussian noise .2. Temperature dependence of inner ear function

    NARCIS (Netherlands)

    vanDijk, P; Wit, HP; Segenhout, JM

    1997-01-01

    The temperature dependence of the response of single primary auditory nerve fibers (n = 31) was investigated in the European edible frog, Rana esculenta (seven ears). Nerve fiber responses were analyzed with Wiener kernel analysis and polynomial correlation. The responses were described with a

  16. The source, discharge, and chemical characteristics of selected springs, and the abundance and health of associated endemic anuran species in the Mojave network parks

    Science.gov (United States)

    Schroeder, Roy A.; Smith, Gregory A.; Martin, Peter; Flint, Alan L.; Gallegos, Elizabeth; Fisher, Robert N.; Martin, Peter; Schroeder, Roy A.

    2015-01-01

    Hydrological and biological investigations were done during 2005 and 2006 in cooperation with the U.S. National Park Service to investigate the source, discharge, and chemical characteristics of selected springs and the abundance and health of endemic anuran (frog and toad) species at Darwin Falls in Death Valley National Park, Piute Spring in Mojave National Preserve, and Fortynine Palms Oasis in Joshua Tree National Park. Discharge from the springs at these sites sustains isolated riparian habitats in the normally dry Mojave Desert. Data were collected on water quantity (discharge) and quality, air and water temperature, and abundance and health of endemic anuran species. In addition, a single survey of the abundance and health of endemic anuran species was completed at Rattlesnake Canyon in Joshua Tree National Park. Results from this study were compared to limited historical data, where they exist, and can provide a baseline for future hydrological and biological investigations to evaluate the health and sustainability of the resource and its response to changing climate and increasing human use.

  17. Southeast regional and state trends in anuran occupancy from calling survey data (2001-2013) from the North American Amphibian Monitoring Program

    Science.gov (United States)

    Villena Carpio, Oswaldo; Royle, J. Andrew; Weir, Linda; Foreman, Tasha M.; Gazenski, Kimberly D.; Campbell Grant, Evan H.

    2016-01-01

    We present the first regional trends in anuran occupancy for eight states of the southeastern United States, based on 13 y (2001–2013) of North American Amphibian Monitoring Program (NAAMP) data. The NAAMP is a longterm monitoring program in which observers collect anuran calling observation data at fixed locations along random roadside routes. We assessed occupancy trends for 14 species. We found weak evidence for a general regional pattern of decline in calling anurans within breeding habitats along roads in the southeastern USA over the last 13 y. Two species had positive regional trends with 95% posterior intervals that did not include zero (Hyla cinerea and Pseudacris crucifer). Five other species also showed an increasing trend, while eight species showed a declining trend, although 95% posterior intervals included zero. We also assessed state level trends for 107 species/state combinations. Of these, 14 showed a significant decline and 12 showed a significant increase in occupancy (i.e., credible intervals did not include zero for these 26 trends).

  18. Breeding under unpredictable conditions: Annual variation in gonadal maturation, energetic reserves and plasma levels of androgens and corticosterone in anurans from the Brazilian semi-arid.

    Science.gov (United States)

    Madelaire, Carla Bonetti; Gomes, Fernando Ribeiro

    2016-03-01

    Anurans living in arid and semi-arid habitats are subjected to unpredictable rain patterns. Consequently, they should be prepared to reproduce at the onset of rain events. We investigated the covariation between calling behavior, testicular maturation, abdominal fat body index (FBI), plasma levels of androgens (T-DHT) and corticosterone (CORT) of males from three species of anurans in the Brazilian semi-arid during the reproductive period and drought. One of these species aestivates during the drought, while the other two species remain foraging. Although the three species display different behavioral strategies during the dry period, they present the same general reproductive patterns. T-DHT levels on the plasma and germinative cyst diameters were higher during the reproductive and breeding period compared to the drought. Additionally, the germinative cysts had all cell stages including sperm bundles during the dry season, however, it was only during the breeding event that free spermatozoa were found in the cyst lumen. These results suggest that these species present the reproductive pattern typical of desert anurans, consisting of opportunistic breeders that reproduce when triggered by a rain stimulus. Rhinella jimi and Pleurodema diplolister had higher CORT when males were calling. Moreover, Rhinella granulosa and P. diplolister showed lower FBI during breeding event, when males were calling. The high levels of CORT and lower FBI during reproductive period are associated, indicating that CORT modulates the recruitment of energy stores to prepare and maintain reproduction, particularly the expensive calling effort. Copyright © 2016 Elsevier Inc. All rights reserved.

  19. New probe microphone for investigating the acoustics of the ear

    DEFF Research Database (Denmark)

    Lauridsen, Ole; Günthersen, Carsten

    1981-01-01

    A new probe microphone employing a soft tube and a compensation network for the tube response is described. Because of the soft tube, this microphone is especially suited for investigating the acoustics of the outer ear and the ear canal, and some such measurements are given.......A new probe microphone employing a soft tube and a compensation network for the tube response is described. Because of the soft tube, this microphone is especially suited for investigating the acoustics of the outer ear and the ear canal, and some such measurements are given....

  20. Concha headphones and their coupling to the ear

    DEFF Research Database (Denmark)

    Blanchard, Lola Justine Kydia Olivia; Agerkvist, Finn T.

    2009-01-01

    The purpose of the study is to obtain a better understanding of concha headphone. Concha headphones are the small types of earpiece that are placed in the concha. They are not sealed to the ear and therefore, there is a leak between the earpiece and the ear. This leak is the reason why there is a...... there is a significant lack of bass when using such headphones. This paper investigates the coupling between the headphone and the ear, by means of measurement in artificial ears and models. The influence of the back volume is taken into account....

  1. Towards making HCS ear detection robust against rotation

    DEFF Research Database (Denmark)

    Pflug, Anika; Back, Philip Michael; Busch, Christoph

    2012-01-01

    pattern recognition techniques have been applied to ear images but similarly to face recognition, rotation and pose still pose problems to ear recognition systems. One solution for this is 3D ear imaging. the segmentation of the ear, prior to the actual feature extraction step, however, remains...... to rotation by using a rotation symmetric, circular detection window. Shape index histograms are extracted at different radii in order to get overlapping subsets within the circle. The detection performance of the modified HCS detector is evaluated on two different datasets, one of them containing images n...

  2. Ear replanatation: a case report and literature review

    Directory of Open Access Journals (Sweden)

    Krešimir Božikov

    2013-10-01

    Full Text Available Background: Total ear amputation is a rare accident. The most common causes are traffic accidents (33 %, followed by fights (28 %. In 1980, Pennington et al. reported the first successful microsurgical ear replantation in a 29-year old man.Methods: An English literature review of trauma cases of total ear amputation showed only 13 successful replantations with arterial and venous microanastomoses. We present a case report of successful total ear replantation with arterial and vein microanastomoses in a 17-year old boy.Results: Our ear replantation with both arterial and venous anastomoses performed was successful and we achieved an excellent aesthetic outcome.Conclusion: The reason for such a low number of successful ear replantations is technical challenge due to small vessel diameter, difficult vessel identification, vessel approach and concomitant avulsion injury. The best aesthetic result in ear reconstruction is achieved by microsurgical replantation. The surgical technique depends on the intraoperative findings. Since ear replantation is a very challenging procedure, a microsurgeon needs to discuss with the patient the risk of partial/total necrosis of the replanted ear and the possibilities of other reconstructive options.

  3. Histopathologic Changes of the Inner ear in Rhesus Monkeys After Intratympanic Gentamicin Injection and Vestibular Prosthesis Electrode Array Implantation.

    Science.gov (United States)

    Sun, Daniel Q; Lehar, Mohamed; Dai, Chenkai; Swarthout, Lani; Lauer, Amanda M; Carey, John P; Mitchell, Diana E; Cullen, Kathleen E; Della Santina, Charles C

    2015-06-01

    otolith end organs except in a single case of saccular injury due to over-insertion of the posterior SCC electrode. While implanted electrodes reached to within 50-760 μm of the target cristae and were usually ensheathed in a thin fibrotic capsule, dense fibrotic reaction and osteoneogenesis were each observed in only one of six electrode tracts examined. Consistent with physiologic studies that have demonstrated directionally appropriate vestibulo-ocular reflex responses to MVP electrical stimulation years after implantation in these animals, histologic findings in the present study indicate that although intralabyrinthine MVP implantation causes some inner ear trauma, it can be accomplished without destroying the distal afferent fibers an MVP is designed to excite.

  4. Comparison of Carina active middle-ear implant with conventional hearing aids for mixed hearing loss.

    Science.gov (United States)

    Savaş, V A; Gündüz, B; Karamert, R; Cevizci, R; Düzlü, M; Tutar, H; Bayazit, Y A

    2016-04-01

    To compare the auditory outcomes of Carina middle-ear implants with those of conventional hearing aids in patients with moderate-to-severe mixed hearing loss. The study comprised nine patients (six males, three females) who underwent middle-ear implantation with Carina fully implantable active middle-ear implants to treat bilateral moderate-to-severe mixed hearing loss. The patients initially used conventional hearing aids and subsequently received the Carina implants. The hearing thresholds with implants and hearing aids were compared. There were no significant differences between: the pre-operative and post-operative air and bone conduction thresholds (p > 0.05), the thresholds with hearing aids and Carina implants (p > 0.05), or the pre-operative (mean, 72.8 ± 19 per cent) and post-operative (mean, 69.9 ± 24 per cent) speech discrimination scores (p > 0.05). One of the patients suffered total sensorineural hearing loss three months following implantation despite an initial 38 dB functional gain. All except one patient showed clinical improvements after implantation according to quality of life questionnaire (Glasgow Benefit Inventory) scores. Acceptance of Carina implants is better than with conventional hearing aids in patients with mixed hearing loss, although both yield similar hearing amplification. Cosmetic reasons appear to be critical for patient acceptance.

  5. Wearable ear EEG for brain interfacing

    Science.gov (United States)

    Schroeder, Eric D.; Walker, Nicholas; Danko, Amanda S.

    2017-02-01

    Brain-computer interfaces (BCIs) measuring electrical activity via electroencephalogram (EEG) have evolved beyond clinical applications to become wireless consumer products. Typically marketed for meditation and neu- rotherapy, these devices are limited in scope and currently too obtrusive to be a ubiquitous wearable. Stemming from recent advancements made in hearing aid technology, wearables have been shrinking to the point that the necessary sensors, circuitry, and batteries can be fit into a small in-ear wearable device. In this work, an ear-EEG device is created with a novel system for artifact removal and signal interpretation. The small, compact, cost-effective, and discreet device is demonstrated against existing consumer electronics in this space for its signal quality, comfort, and usability. A custom mobile application is developed to process raw EEG from each device and display interpreted data to the user. Artifact removal and signal classification is accomplished via a combination of support matrix machines (SMMs) and soft thresholding of relevant statistical properties.

  6. Social Factors Contributing to Exceptional Navajo Children

    Science.gov (United States)

    Leslie, Ernest

    1977-01-01

    Factors leading to exceptionality in Navajo children are explored, reactions of Navajo families to exceptionality and mental retardation are considered, and problems in providing special education services to this population are pointed out. (SBH)

  7. Ear-to-Ear On-Body Channel Fading in the ISM-band for Tangentially-Polarized Antennas

    DEFF Research Database (Denmark)

    Kvist, Søren Helstrup; Thaysen, Jesper; Jakobsen, Kaj Bjarne

    2011-01-01

    The ear-to-ear on-body channel fading has been studied in the ISM-band. The ear-to-ear path gain was measured on six persons in an indoor environment for a duration of 200 s. The channel fading has been characterized in terms of empirical cumulative distribution functions (CDF), average fade dura...... duration (AFD), and level crossing rate (LCR) for each of the six persons. Seven probability distributions, including Rician and Nakagamim were fitted by the use of maximum likelihood estimation (MLE). The distributions are ranked by their goodness-of-fit to the empirical CDFs....

  8. Improvement of the ear-to-ear path gain at 2.45 GHz using parasitic antenna element

    DEFF Research Database (Denmark)

    Kvist, Søren Helstrup; Ôzden, Sinasi; Thaysen, Jesper

    2012-01-01

    Two antenna configurations are considered for ear-to-ear on-body communications at 2.45 GHz. Both consist of monopole antennas operated on small ground planes that are placed next to the human head. Their performances are compared in terms of maximum path gain (|S21|) and obtainable bandwidth...... of the antenna structures. It is found that the bandwidth, as well as the ear-to-ear path gain can be improved by the addition of a parasitic monopole antenna element. The parasitic antenna element affects the electric current distribution on the ground plane, which has a favorable impact on the on-body antenna...

  9. Effects of a commonly used glyphosate-based herbicide formulation on early developmental stages of two anuran species.

    Science.gov (United States)

    Wagner, Norman; Müller, Hendrik; Viertel, Bruno

    2017-01-01

    Environmental contamination, especially due to the increasing use of pesticides, is suggested to be one out of six main reasons for the global amphibian decline. Adverse effects of glyphosate-based herbicides on amphibians have been already discussed in several studies with different conclusions, especially regarding sublethal effects at environmentally relevant concentrations. Therefore, we studied the acute toxic effects (mortality, growth, and morphological changes) of the commonly used glyphosate-based herbicide formulation Roundup® UltraMax on early aquatic developmental stages of two anuran species with different larval types (obligate vs. facultative filtrating suspension feeders), the African clawed frog (Xenopus laevis) and the Mediterranean painted frog (Discoglossus pictus). While X. laevis is an established anuran model organism in amphibian toxicological studies, we aim to establish D. pictus as another model for species with facultative filtrating larvae. A special focus of the present study lies on malformations in X. laevis embryos, which were investigated using histological preparations. In general, embryos and larvae of X. laevis reacted more sensitive concerning lethal effects compared to early developmental stages of D. pictus. It was suggested, that especially the different morphology of their filter apparatus and the higher volume of water pumped through the buccopharynx of X. laevis larvae lead to higher exposure to the formulation. The test substance induced similar lethal effects in D. pictus larvae as it does in the teleost standard test organism used in pesticide approval, the rainbow trout (Oncorhynchus mykiss), whereas embryos of both species are apparently more tolerant and, conversely, X. laevis larvae about two times more sensitive. In both species, early larvae always reacted significantly more sensitive than embryos. Exposure to the test substance increased malformation rates in embryos of both species in a concentration

  10. Adapting American Policymaking to Overcome American Exceptionalism

    Science.gov (United States)

    2015-04-13

    permission of the author 14. ABSTRACT the thesis begins with the etymology of American exceptionalism and the way in which its connotation has changed...Author. ABSTRACT The thesis begins with the etymology of American exceptionalism and the way in which its connotation has changed throughout American...impact. CONTENTS CHAPTER 1: INTRODUCTION I The Etymology and History of American Exceptionalism 3 CHAPTER 2: AMERICAN EXCEPTIONALISM, THE EARLY YEARS 7

  11. A transactional model for automatic exception handling

    OpenAIRE

    Cabral, Bruno Miguel Brás

    2009-01-01

    Tese de doutoramento em Engenharia Informática apresentada à Fac. de Ciências e Tecnologia da Univ. de Coimbra Exception handling mechanisms have been around for more than 30 years. Although modern exceptions systems are not very different from the early models, the large majority of modern programming languages rely on exception handling constructs for dealing with errors and abnormal situations. Exceptions have several advantages over other error handling mechanisms, such as the return o...

  12. Evaluation of fungal flora in normal and diseased canine ears.

    Science.gov (United States)

    Campbell, Jacquelyn J; Coyner, Kimberly S; Rankin, Shelley C; Lewis, Thomas P; Schick, Anthea E; Shumaker, Amy K

    2010-12-01

    This study was undertaken to characterize otic fungal flora encountered in normal dogs, atopic dogs with no clinical or cytological evidence of otitis and dogs with otitis externa. Forty-two normal dogs, 23 atopic dogs and 32 dogs with otitis were included in the study. Samples for otic fungal culture and cytology were obtained from all animals, for a total of 194 ears. Sixty-seven ear samples (34%) were culture positive for saprophytic fungal organisms, as follows: 43 (64%) Penicillium species, 13 (19%) Aspergillus species and the remaining 17% comprised of various other saprophytic fungal organisms. Cytological evidence of saprophytic fungal colonization or infection was not found in any animal. There was no relationship between positive saprophytic fungal culture and any study group. Thirty-three ear samples (17%) were positive for Malassezia pachydermatis. Cytological findings of Malassezia were significantly associated with positive culture for Malassezia (P = 0.006 left ear; P = 0.019 right ear). Furthermore, increased numbers of Malassezia led to a higher chance of positive culture (P = 0.003 left ear; P = 0.008 right ear; McNemar's test). Malassezia pachydermatis was more likely to be cultured from ears with increased cerumen. Ear type (erect or pendulous) was not significantly associated with positive culture for Malassezia or saprophytic fungal organisms. There was no relationship between positive Malassezia culture and any study group; however, Malassezia was more likely to be cultured from individual dogs in the atopic or otitis groups that also had other dermatological signs consistent with allergic dermatitis and/or pyoderma (P = 0.031 left ear; P = 0.005 right ear). © 2010 The Authors. Journal compilation © 2010 ESVD and ACVD.

  13. Probing the Xenopus laevis inner ear transcriptome for biological function

    Directory of Open Access Journals (Sweden)

    Powers TuShun R

    2012-06-01

    Full Text Available Abstract Background The senses of hearing and balance depend upon mechanoreception, a process that originates in the inner ear and shares features across species. Amphibians have been widely used for physiological studies of mechanotransduction by sensory hair cells. In contrast, much less is known of the genetic basis of auditory and vestibular function in this class of animals. Among amphibians, the genus Xenopus is a well-characterized genetic and developmental model that offers unique opportunities for inner ear research because of the amphibian capacity for tissue and organ regeneration. For these reasons, we implemented a functional genomics approach as a means to undertake a large-scale analysis of the Xenopus laevis inner ear transcriptome through microarray analysis. Results Microarray analysis uncovered genes within the X. laevis inner ear transcriptome associated with inner ear function and impairment in other organisms, thereby supporting the inclusion of Xenopus in cross-species genetic studies of the inner ear. The use of gene categories (inner ear tissue; deafness; ion channels; ion transporters; transcription factors facilitated the assignment of functional significance to probe set identifiers. We enhanced the biological relevance of our microarray data by using a variety of curation approaches to increase the annotation of the Affymetrix GeneChip® Xenopus laevis Genome array. In addition, annotation analysis revealed the prevalence of inner ear transcripts represented by probe set identifiers that lack functional characterization. Conclusions We identified an abundance of targets for genetic analysis of auditory and vestibular function. The orthologues to human genes with known inner ear function and the highly expressed transcripts that lack annotation are particularly interesting candidates for future analyses. We used informatics approaches to impart biologically relevant information to the Xenopus inner ear transcriptome

  14. Analysis of the microcirculation after soft tissue reconstruction of the outer ear with burns in patients with severe burn injuries.

    Science.gov (United States)

    Medved, Fabian; Medesan, Raluca; Rothenberger, Jens Martin; Schaller, Hans-Eberhard; Schoeller, Thomas; Manoli, Theodora; Weitgasser, Lennart; Naumann, Aline; Weitgasser, Laurenz

    2016-07-01

    Reconstruction of soft tissue defects of the ear with burns remains one of the most difficult tasks for the reconstructive surgeon. Although numerous reconstructive options are available, the results are often unpredictable and worse than expected. Besides full and split skin grafting, local random pattern flaps and pedicled flaps are frequently utilized to cover soft tissue defects of the outer auricle. Because of the difficulty and unpredictable nature of outer ear reconstruction after burn injury, a case-control study was conducted to determine the best reconstructive approach. The microcirculatory properties of different types of soft tissue reconstruction of the outer ear with burns in six severely burned Caucasian patients (three men and three women; mean age, 46 years (range, 22-70)) were compared to those in the healthy tissue of the outer ear using the O2C device (Oxygen to See; LEA Medizintechnik, Gießen, Germany). The results of this study revealed that the investigated microcirculation parameters such as the median values of blood flow (control group: 126 AU), relative amount of hemoglobin (control group: 59.5 AU), and tissue oxygen saturation (control group: 73%) are most similar to those of normal ear tissue when pedicled flaps based on the superficial temporal artery were used. These findings suggest that this type of reconstruction is superior for soft tissue reconstruction of the outer ear with burns in contrast to random pattern flaps and full skin grafts regarding the microcirculatory aspects. These findings may improve the knowledge on soft tissue viability and facilitate the exceptional and delicate process of planning the reconstruction of the auricle with burns. Copyright © 2016 British Association of Plastic, Reconstructive and Aesthetic Surgeons. Published by Elsevier Ltd. All rights reserved.

  15. CAULIFLOWER EAR AND SKIN INFECTIONS AMONG WRESTLERS IN TEHRAN

    Directory of Open Access Journals (Sweden)

    Ramin Kordi

    2007-10-01

    Full Text Available The purpose of the study was to describe the magnitude of the selected sports medicine problems (i.e. cauliflower ear and skin infections among wrestlers in Tehran. A number of 411 wrestlers were randomly selected from wrestling clubs in Tehran employing cluster sample setting method. The participants were interviewed using a specially designed and validated questionnaire. Nearly half of the participants (44% had "cauliflower ears". Only 23% of these participants had received any kind of treatment for their acute ear haematomas that are known to result in "cauliflower ears". The prevalence of reported hearing loss among participants with cauliflower ears (11.5%, 95%CI: 6.9 to 16.2 was significantly more than this prevalence among those participants without cauliflower ears (1.8%, 95%CI: 0.1 to 3.5 (p < 0.05. More than half of the participants (52% had skin infection diagnosed by a physician during the previous year. This study has identified evidence of an increase in hearing loss as a possible side effect of either cauliflower ear or ear injury in wrestling in Iran. There has been an outbreak of ringworm and there is a significant potential for an outbreak of impetigo among wrestlers in Tehran

  16. Ear-related problems among children attending the paediatric and ...

    African Journals Online (AJOL)

    2006-08-31

    Aug 31, 2006 ... Abstract. Background: Ear related diseases are commonly seen in clinics worldwide especially among children. They are associated with significant morbidity and frequent hospital visits. Limited data exists regarding the burden of ear disease among Nigerian children. Objective: To determine the ...

  17. Coupling of earphones to human ear and to coupler

    Science.gov (United States)

    Ciric, Dejan; Hammershoi, Dorte

    2004-05-01

    The use of a standardized acoustical coupler should enable a calibration of audiometric earphones which ensures that the thresholds determined in the audiometry will be independent of the earphone type. This requires that the coupler approximates the average human ear closely. Nevertheless, the differences among earphones as well as between human ears and the coupler affect the results of audiometric measurements inducing uncertainty. The influence of these differences is examined by investigating the coupling of different earphones to human ears and to the standardized coupler. This is done by measurement of the transfer functions from input voltage of the earphone terminals to the entrance of the ear canal in two situations: (1) open, and (2) blocked. Similar measurements were carried out with the coupler, but since the ``ear-canal entrance'' is not well-defined for the coupler, the mentioned measurements were done at different depths in the coupler. The earphone's coupling to (i) human ears and to (ii) the coupler, described in terms of the pressure division at the entrance of the ear canal, were compared. The results indicate that the coupling to the human ear and the coupling to the standardized coupler differ.

  18. Clinical evidence in the management of swimmer's ear

    African Journals Online (AJOL)

    be used, which are normally freshly prepared by a pharmacist. These formulations include 1% acetic acid in distilled water, 1%. “Swimmer's ear” or acute otitis externa is a common condition involving the exterior part of the ear, including the ear canal and the pinna. Inflammation and pain are the main features, with bacterial ...

  19. Ad Hoc Constitution of Topical Antibiotics Solution for Ear Dressing ...

    African Journals Online (AJOL)

    Background/ Purpose: In the management of chronic suppurative otitis media and otitis externa there are few cases where although an organism is cultured and isolated from the ear, there are either no antibiotic sensitive to the microbiological flora or the sensitive antibiotic is not available in the form of an ear drop, limiting ...

  20. In-the-Ear Spiral Monopole Antenna for Hearing Instruments

    DEFF Research Database (Denmark)

    Kammersgaard, Nikolaj Peter Iversen; Kvist, Søren Helstrup; Thaysen, Jesper

    2014-01-01

    A novel in-the-ear (ITE) antenna solution for hearing instruments that operates at 2.45 GHz is presented. The antenna consists of a quarter wave monopole and a ground plane that are placed in the ear. The simulated path gain | S 21 |is − 86 dB and the measured path gain is − 80 dB. Simulations...

  1. EAR motif-mediated transcriptional repression in plants

    Science.gov (United States)

    Kagale, Sateesh

    2011-01-01

    Ethylene-responsive element binding factor-associated amphiphilic repression (EAR) motif-mediated transcriptional repression is emerging as one of the principal mechanisms of plant gene regulation. The EAR motif, defined by the consensus sequence patterns of either LxLxL or DLN xxP, is the most predominant form of transcriptional repression motif so far identified in plants. Additionally, this active repression motif is highly conserved in transcriptional regulators known to function as negative regulators in a broad range of developmental and physiological processes across evolutionarily diverse plant species. Recent discoveries of co-repressors interacting with EAR motifs, such as TO PLESS (TPL) and AtSA P18, have begun to unravel the mechanisms of EAR motif-mediated repression. The demonstration of genetic interaction between mutants of TPL and AtHDA 19, co-complex formation between TPL-related 1 (TPR1) and AtHDA 19, as well as direct physical interaction between AtSA P18 and AtHDA 19 support a model where EAR repressors, via recruitment of chromatin remodeling factors, facilitate epigenetic regulation of gene expression. Here, we discuss the biological significance of EAR -mediated gene regulation in the broader context of plant biology and present literature evidence in support of a model for EAR motif-mediated repression via the recruitment and action of chromatin modifiers. Additionally, we discuss the possible influences of phosphorylation and ubiquitination on the function and turnover of EAR repressors. PMID:20935498

  2. The acoustical significance of age-dependent ear elongation

    DEFF Research Database (Denmark)

    Christensen, Flemming

    2015-01-01

    , corresponding to what is reported in the literature. For female ears, virtually no acoustical effect was found. For male ears directional dependent effects in the range up to 5 dB on average was found for certain directions and frequencies. Implications on age dependent hearing loss (presbycusis...

  3. Profile of Ear Diseases among Elderly Patients in Sagamu, South ...

    African Journals Online (AJOL)

    The importance of screening for hearing impairment in the elderly patients was also stressed. KEYWORDS: Cerumen, Ear disease, Elderly, Otitis, Presbycusis. Erratum Note: Olusola AS on the article “Profile of Ear Diseases among Elderly Patients in Sagamu, South-Western Nigeria” on Page Nig. J. Med 2013. 143-147.

  4. Pattern of ear diseases among older people | Afolabi | East and ...

    African Journals Online (AJOL)

    The commonest ear disease was impacted cerumen with bilateral less than unilateral hearing loss (Presbycusis) in 93 (18.2%) of the patients. Among cases with infective ear diseases, chronic suppurative otitis media was diagnozed in 33 (6.5%) of which 26 (78.8%) were unilateral and 7 (21.2%) were bilateral.

  5. Why do elephants flap their ears? | Wright | African Zoology

    African Journals Online (AJOL)

    The blood flow in the ear of the African elephant Loxodonta africana was measured In anaesthetized animals using the dye dilution technique at the same time as the arterio-venous temperature difference. The calculated heat loss from the ear is shown to be a substantial proportion of the total metabolic heat-loss ...

  6. Behmel syndrome with bilateral posterior ear lobule creases

    African Journals Online (AJOL)

    Rabah M. Shawky

    2013-09-08

    Sep 8, 2013 ... accessory nipples, hepatomegaly, and congenital heart. The patients have bilateral anterior helical ear pits, and characteristic posterior ear lobule creases. The older one has severe mental retardation and died at the age of 13 months with bronchopneumonia, and the younger one is 7 months old.

  7. 14 CFR 67.305 - Ear, nose, throat, and equilibrium.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Ear, nose, throat, and equilibrium. 67.305..., nose, throat, and equilibrium. Ear, nose, throat, and equilibrium standards for a third-class airman... by, or that may reasonably be expected to be manifested by, vertigo or a disturbance of equilibrium. ...

  8. 14 CFR 67.105 - Ear, nose, throat, and equilibrium.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Ear, nose, throat, and equilibrium. 67.105..., nose, throat, and equilibrium. Ear, nose, throat, and equilibrium standards for a first-class airman... may reasonably be expected to be manifested by, vertigo or a disturbance of equilibrium. ...

  9. 14 CFR 67.205 - Ear, nose, throat, and equilibrium.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 2 2010-01-01 2010-01-01 false Ear, nose, throat, and equilibrium. 67.205..., nose, throat, and equilibrium. Ear, nose, throat, and equilibrium standards for a second-class airman..., vertigo or a disturbance of equilibrium. ...

  10. The maize rachis affects Aspergillus flavus movement during ear development

    Science.gov (United States)

    Aspergillus flavus expressing green fluorescent protein (GFP) was used to follow infection in ears of maize hybrids resistant and susceptible to the fungus. Developing ears were needle-inoculated with GFP-transformed A. flavus 20 days after silk emergence, and GFP fluorescence in the pith was evalu...

  11. Comparison of Microbiological Flora in the External Auditory Canal of Normal Ear and an Ear with Acute Otitis Externa

    Science.gov (United States)

    Ghanpur, Asheesh Dora; Nayak, Dipak Ranjan; Chawla, Kiran; Shashidhar, V

    2017-01-01

    Introduction Acute Otitis Externa (AOE) is also known as swimmer’s ear. Investigations initiated during World War II firmly established the role of bacteria in the aetiology of Acute Otitis Externa. Aim To culture the microbiological flora of the normal ear and compare it with the flora causing AOE and to know the role of normal ear canal flora and anaerobes in the aetiology. Materials and Methods A prospective observational study was conducted on 64 patients clinically diagnosed with unilateral AOE. Ear swabs were taken from both the ears. Microbiological flora was studied considering diseased ear as test ear and the normal ear as the control. Aerobic and anaerobic cultures were done. Severity of the disease was assessed by subjective and objective scores. Effect of topical treatment with ichthammol glycerine pack was assessed after 48 hours and scores were calculated again. Patients with scores < 4 after pack removal were started on systemic antibiotics and were assessed after seven days of antibiotics course. Data was analysed using Paired t-test, Wilcoxon signed ranks test and Chi-square test. A p-value < 0.05 was considered significant. Results Pseudomonas aeruginosa (33%) was the most common bacteria cultured from the ear followed by Methicillin Resistant Staphylococcus aureus (MRSA) (18%). Patients with anaerobic organism in the test ear had severe symptoms and needed systemic antibiotic therapy. Conclusion Most of the cases may respond to empirical antibiotic therapy. In cases with severe symptoms and the ones refractory to empirical treatment, a culture from the ear canal will not be a tax on the patient. This helps in giving a better understanding about the disease, causative organisms and helps in avoiding the use of inappropriate antibiotics that usually result in developing resistant strains of bacteria. PMID:29207743

  12. Expression pattern of glycoconjugates in the integument of Bufo ictericus (Anuran, Bufonidae): biochemical and histochemical (lectin) profiles.

    Science.gov (United States)

    de Brito Gitirana, Lycia; Azevedo, Rodrigo Alves; Pelli, Adriana Alves

    2007-12-01

    Mucous consists of glycoproteins and proteoglycans produced by specific secretory cells (mucocytes). In anurans the cutaneous mucous is produced by intradermal glands and displays both mechanical and chemical protection functions. Indeed, mucous maintains the integument moist and facilitates gas exchange (cutaneous respiration). In this work, the carbohydrate moiety distribution was investigated in the integument of Bufo ictericus using conventional and lectin histochemistry to describe the pattern of cutaneous glycoconjugate expression, including both secretory and structural proteoglycans. As a preliminary step, the descendent chromatography in Whatmann 1MM paper was undertaken to prepare the histochemical trials involving the lectins. In B. ictericus, the integument exhibits the basic morphological structure found in lower terrestrial vertebrates: the epidermis is a keratinized squamous stratified epithelium supported by spongious and compact layers. The spongy dermis contain secretory portion of both mucous and serous (or poison) glands. The paper chromatography identified galactose, fucose and mannose as characteristic sugar residues. The secretory cells of the mucous gland in the dermis, as well as the interstice between the stratum corneum and the subjacent stratum spinosum in the epidermis exhibit alpha-l-fucose and alpha-galactose residues. The serous glands give no reaction. The alpha-mannose residue was detected in the extracellular matrix of spongious dermis, but not in the dermal glands. The different glycoconjugate location reflects in two glycoconjugates categories: the secretory which participate in the water flow regulation, and the structural which is involved in the dermal maintenance.

  13. Molecular evidence that Langeronia macrocirra and Langeronia cf. parva (Trematoda: Pleurogenidae) parasites of anurans from Mexico are conspecific.

    Science.gov (United States)

    Martínez-Salazar, Elizabeth A; León-Règagnon, Virginia

    2010-12-01

    The genus Langeronia parasitizing the intestine of several species of anurans is distributed from North to Central America. We identified Langeronia macrocirra and Langeronia cf. parva from the same host and localities, and present here new data not applicable about their tegumental surface by scanning electron microscopy. We compared sequences of the rDNA ITS2 region and mtDNA cox1 gene for the two morphotypes. ITS2 exhibited a high degree of conservation. Phylogenetic reconstruction using cox1 revealed three clades (I, II, and III), which did not correspond to a previous identification or host. Little divergence was found within clades: sequences were identical in clade I, whereas clade II had 0.27% and clade III had 1.08%. Inter-clade divergence reached 8.69% (I vs. III). This pattern of genetic divergence indicated that both taxa probably belong to the same species, so we posit that the morphological changes could be correlated with development. Increasing sample size and geographical coverage will contribute to the taxonomy of the genus based on morphological and molecular evidence, and will open tracks toward the use of DNA barcodes to the genus in Mexico.

  14. Wetland Reserve Program enhances site occupancy and species richness in assemblages of anuran amphibians in the Mississippi Alluvial Valley, USA

    Science.gov (United States)

    Walls, Susan C.; Waddle, J. Hardin; Faulkner, Stephen P.

    2014-01-01

    We measured amphibian habitat use to quantify the effectiveness of conservation practices implemented under the Wetland Reserve Program (WRP), an initiative of the U.S. Department of Agriculture’s Natural Resources Conservation Service. From February to June 2007, we quantified calling male anurans in cultivated cropland, former cultivated cropland restored through the WRP, and mature bottomland hardwood forest. Sites were located in two watersheds within the Mississippi Alluvial Valley of Arkansas and Louisiana, USA. We estimated detection probability and site occupancy within each land use category using a Bayesian hierarchical model of community species occurrence, and derived an estimate of species richness at each site. Relative to sites in cultivated cropland, nine of 1 l species detected were significantly more likely to occur at WRP sites and six were more likely to occur at forested sites. Species richness estimates were also higher for WRP and forested sites, compared to those in cultivated cropland. Almost half (45 %) of the species responded positively to both WRP and forested sites, indicating that patches undergoing restoration may be important transitional habitats. Wetland Reserve Program conservation practices are successful in restoring suitable habitat and reducing the impact of cultivation-induced habitat loss on amphibians in the Mississippi Alluvial Valley.

  15. The effects of the amphibian chytrid fungus, insecticide exposure, and temperature on larval anuran development and survival.

    Science.gov (United States)

    Rumschlag, Samantha L; Boone, Michelle D; Fellers, Gary

    2014-11-01

    Chytridiomycosis, a disease caused by Batrachochytrium dendrobatidis (Bd), has been implicated as a cause of amphibian declines. Susceptibility may be influenced by environmental factors that suppress the immune response. The authors conducted a laboratory study to examine the effect of temperature, insecticide exposure, and Bd exposure during larval anuran development. The authors examined the consequences of exposure to Bd, an insecticide (carbaryl or malathion), and static or fluctuating temperature (15 °C, 20 °C, 25 °C, or 15 °C to 25 °C 72-h flux) on larval development through metamorphosis of the Pacific treefrog (Pseudacris regilla). High and fluctuating temperature had negative effects on survival in the presence of Bd. Insecticides inhibited the effects of Bd; time to tail resorption of Pacific treefrogs decreased when tadpoles were exposed to carbaryl. The present study indicates that abiotic factors may play a role in the host-pathogen interactions in this system. © 2014 SETAC.

  16. Standardize or Diversify Experimental Conditions in Ecotoxicology? A Case Study on Herbicide Toxicity to Larvae of Two Anuran Amphibians.

    Science.gov (United States)

    Mikó, Zsanett; Ujszegi, János; Gál, Zoltán; Hettyey, Attila

    2017-11-01

    Despite a steeply increasing number of ecotoxicological studies on the effects of pesticides on nontarget organisms, studies assessing the adequacy and reliability of different experimental approaches have remained scarce. We scrutinized effects of a glyphosate-based herbicide on larvae of two European anuran amphibians by estimating species-specific LC50 values, assessing how an additional stress factor may influence outcomes, and investigating whether replicate experiments yielded qualitatively the same results. We exposed Rana dalmatina and Bufo bufo tadpoles to two predator treatments (no predator vs. predator chemical cues) combined with varying herbicide concentrations, repeated the experiment with a subset of the experimental treatments and partly with slight modifications 1 week later and assessed survival. Our results indicated that the herbicide was moderately toxic to tadpoles. The presence of predator chemical cues did not affect the lethality of the herbicide in either species. The estimated sensitivity of R. dalmatina tadpoles varied considerably across experiments, whereas in case of B. bufo LC50 values remained very similar. Our results suggest that differences in the experimental setup may often have no influence on the measured effects of pesticides, whereas replicated experiments can deliver widely differing results in other cases, perhaps depending on the studied species, the population origin of the tested individuals, or the test conditions. This draws attention to the suggestion that strict standardization may not deliver widely applicable insights into the toxicity of contaminants and, instead, intentionally introducing variation into the design of ecotoxicological experiments and replicating entire experiments may prove highly beneficial.

  17. Mating signals indicating sexual receptiveness induce unique spatio-temporal EEG theta patterns in an anuran species.

    Directory of Open Access Journals (Sweden)

    Guangzhan Fang

    Full Text Available Female mate choice is of importance for individual fitness as well as a determining factor in genetic diversity and speciation. Nevertheless relatively little is known about how females process information acquired from males during mate selection. In the Emei music frog, Babina daunchina, males normally call from hidden burrows and females in the reproductive stage prefer male calls produced from inside burrows compared with ones from outside burrows. The present study evaluated changes in electroencephalogram (EEG power output in four frequency bands induced by male courtship vocalizations on both sides of the telencephalon and mesencephalon in females. The results show that (1 both the values of left hemispheric theta relative power and global lateralization in the theta band are modulated by the sexual attractiveness of the acoustic stimulus in the reproductive stage, suggesting the theta oscillation is closely correlated with processing information associated with mate choice; (2 mean relative power in the beta band is significantly greater in the mesencephalon than the left telencephalon, regardless of reproductive status or the biological significance of signals, indicating it is associated with processing acoustic features and (3 relative power in the delta and alpha bands are not affected by reproductive status or acoustic stimuli. The results imply that EEG power in the theta and beta bands reflect different information processing mechanisms related to vocal recognition and auditory perception in anurans.

  18. Inner ear symptoms and disease: Pathophysiological understanding and therapeutic options

    Science.gov (United States)

    Ciuman, Raphael R.

    2013-01-01

    In recent years, huge advances have taken place in understanding of inner ear pathophysiology causing sensorineural hearing loss, tinnitus, and vertigo. Advances in understanding comprise biochemical and physiological research of stimulus perception and conduction, inner ear homeostasis, and hereditary diseases with underlying genetics. This review describes and tabulates the various causes of inner ear disease and defines inner ear and non-inner ear causes of hearing loss, tinnitus, and vertigo. The aim of this review was to comprehensively breakdown this field of otorhinolaryngology for specialists and non-specialists and to discuss current therapeutic options in distinct diseases and promising research for future therapies, especially pharmaceutic, genetic, or stem cell therapy. PMID:24362017

  19. Segmentation algorithms for ear image data towards biomechanical studies.

    Science.gov (United States)

    Ferreira, Ana; Gentil, Fernanda; Tavares, João Manuel R S

    2014-01-01

    In recent years, the segmentation, i.e. the identification, of ear structures in video-otoscopy, computerised tomography (CT) and magnetic resonance (MR) image data, has gained significant importance in the medical imaging area, particularly those in CT and MR imaging. Segmentation is the fundamental step of any automated technique for supporting the medical diagnosis and, in particular, in biomechanics studies, for building realistic geometric models of ear structures. In this paper, a review of the algorithms used in ear segmentation is presented. The review includes an introduction to the usually biomechanical modelling approaches and also to the common imaging modalities. Afterwards, several segmentation algorithms for ear image data are described, and their specificities and difficulties as well as their advantages and disadvantages are identified and analysed using experimental examples. Finally, the conclusions are presented as well as a discussion about possible trends for future research concerning the ear segmentation.

  20. Magnetic resonance imaging in inflammatory lesions of the middle ear

    Energy Technology Data Exchange (ETDEWEB)

    Tono, Tetsuya; Saku, Kazuaki; Miyanaga, Satoshi; Kano, Kiyo; Morimitsu, Tamotsu; Suzuki, Yukiko.

    1988-05-01

    Eighteen patients with chronic otitis media, middle ear cholesteatoma, and postoperative inflammatory diseases of the middle ear underwent high resolution computerized tomography (CT) and magnetic resonance imaging (MRI) before surgical exploration of the middle ear. Results showed that CT provides higher detail resolution in middle ear structures, but provides limited density resolution in displaying inflammatory soft tissue lesions. By contrast, MRI differentiates among soft tissue lesions such as fluid-filled spaces, granulation tissues, and cholesteatomatous debris. Cholesterin granulomas show a particularly characteristic signal pattern with a very high intensity area in both T1 and T2 weighted images. It is concluded that MRI is useful in differentiating soft tissue density masses when used in conjunction with CT in middle ear inflammatory diseases.

  1. Pinna fillet flap after advanced external ear tumor resection

    Directory of Open Access Journals (Sweden)

    L. Esposito

    2016-06-01

    Full Text Available Reconstruction after excision of infiltrating basal cell carcinomas (BCCs of the upper pole of the ear can be achieved with different techniques. The concept of spare-part surgery, which allows the surgeon to perform primary reconstruction of a defect without harvesting tissue from the adjacent areas, has been applied to the ear anatomy. We describe our experience with the use of a fillet flap from the residual external ear in two patients out of a series of six, undergoing reconstruction of ear defects after infiltrating BCC resection between January 2011 and December 2014. Reconstruction with the fillet of pinna flap was proven to be an easy surgical technique with good functional and cosmetic outcomes. Our technique, not previously reported, enhances the versatility of ear reconstruction.

  2. Aberrant internal carotid artery in the middle ear

    Energy Technology Data Exchange (ETDEWEB)

    Roh, Keun Tak; Kang, Hyun Koo [Dept. of Radiology, Seoul Veterans Hospital, Seoul (Korea, Republic of)

    2014-10-15

    The knowledge about the aberrant internal carotid artery (ICA) in the middle ear is essential for clinicians, because a misdiagnosis of the aberrant ICA could have serious consequences such as excessive aural bleeding during a middle ear surgery. A 38-year-old woman presented with tinnitus and hearing difficulties of the left ear that had started 5 years ago. During otoscopy, an anteroinferior bluish mass was seen in the tympanic space. Computed tomography and magnetic resonance imaging demonstrated a left-side aberrant ICA with bony dehiscence of the carotid canal in the middle ear and a reduced diameter of the tympanic ICA. Herein we report a case of an aberrant ICA in the middle ear. We also review the literature regarding this important vascular anomaly of the temporal bone which may lead to disastrous surgical complications.

  3. Hearables: Multimodal physiological in-ear sensing

    CERN Document Server

    Goverdovsky, Valentin; Nakamura, Takashi; Looney, David; Sharp, David J; Papavassiliou, Christos; Morrell, Mary J; Mandic, Danilo P

    2016-01-01

    Future health systems require the means to assess and track the neural and physiological function of a user over long periods of time and in the community. Human body responses are manifested through multiple modalities, such as the mechanical, electrical and chemical; yet current physiological monitors (actigraphy, heart rate) largely lack in both the desired cross-modal and non-stigmatizing aspects. We address these challenges through an inconspicuous and comfortable earpiece, equipped with miniature multimodal sensors, which benefits from the relatively stable position of the ear canal with respect to vital organs to robustly measure the brain, cardiac and respiratory functions. Comprehensive experiments validate each modality within the proposed earpiece, while its potential in health monitoring is illustrated through case studies. We further demonstrate how combining data from multiple sensors within such an integrated wearable device improves both the accuracy of measurements and the ability to deal wit...

  4. Ear reconstruction with porous polyethylene implants.

    Science.gov (United States)

    Berghaus, Alexander; Stelter, Klaus; Naumann, Andreas; Hempel, John Martin

    2010-01-01

    This article describes a surgical technique using porous polyethylene as the framework material for ear reconstruction. In comparison to the use of rib cartilage, porous polyethylene - first described by Berghaus in 1982 - provides better definition and projection as well as congruency with the opposite side. Hospitalization time is significantly shorter. There are less surgical interventions than with traditional microtia operations that use rib cartilage, and the patient is spared the additional procedure needed to remove the rib cartilage, with all the associated complications as well as the resulting thorax scar. Also, reconstruction can take place at an earlier age, which is advantageous for those concerned. Using porous polyethylene as the frame material, a temporoparietal flap and full-thickness skin cover, we have been able to achieve very convincing results over recent years. Copyright 2010 S. Karger AG, Basel.

  5. Analysis of Earing in Deep Drawn Cups

    Science.gov (United States)

    Aretz, Holger; Aegerter, Johannes; Engler, Olaf

    2010-06-01

    The cup-drawing of a strongly anisotropic sheet metal is simulated using a commercial finite element software along with a user material subroutine. In order to accurately describe the plastic anisotropy of the material the well-known recent yield function `Yld2004-18p' is extended. Regarding the experimental characterization of the considered material the occurrence of dynamic strain aging lead to an oscillating signal of the width change of the tensile samples, which prevented a reliable determination of plastic strain ratios (r-values). Thus, an improved measurement concept was developed that leads to a very robust and reproducible determination of r-values. Furthermore, a novel plane-strain tensile test sample is presented which is used for the characterization of the plastic anisotropy in biaxial loading states. A quantitative comparison with measured earing profiles of deep drawn cups illustrates the predictive capabilities of the numerical simulation.

  6. Mozart Ear Deformity: a Rare Diagnosis in the Ear Reconstruction Clinic.

    Science.gov (United States)

    Telich-Tarriba, Jose E; Victor-Baldin, Andre; Apellaniz-Campo, Armando

    2017-07-01

    Mozart ear is a rare auricular deformity; clinically the auricle is characterized by the bulging appearance of the anterosuperior portion of the auricle due to fusion of the crura of the antihelix, an inversion in the normal form of the cavum conchae resulting in its convexity and a slit-like narrowing of the orifice of the external auditory meatus.A retrospective review of clinical and photographic records of patients attended at the ear reconstruction clinic of our hospital between June of 2010 and May 2016 was performed; out of 576 consecutive patients only 3 fulfilled the inclusion criteria, with a prevalence of 0.5%. The authors present these patients.Surgical interventions mainly focus on the correction of the convex concha; however, the procedure should be tailored to the severity of the deformity and the wishes of the patient.

  7. Presbycusis: do we have a third ear?

    Directory of Open Access Journals (Sweden)

    Luis Roque Reis

    Full Text Available Abstract Introduction: Age-related hearing changes are the most frequent cause of sensorineural hearing loss in adults. In the literature no studies exist concerning the importance of speechreading in individuals with presbycusis. Equally, no such studies have been carried out with speakers of the Portuguese (Portugal language. Objectives: To evaluate whether the intelligibility of words in presbycusis is improved by speechreading, in such a way that looking at the interlocutor's face while he is talking functions like a “third ear”, and to determine the statistical relevance of the intelligibility improvement by speechreading. Methods: Eleven individuals (22 ears with bilateral and symmetrical sensorineural hearing loss compatible with presbycusis were evaluated. The subjects were aged between 57 and 82 years, with an average of 70 ± 11.51 years and median of 69.5 years. A complete medical and audiological profile of each patient was created and all patients were submitted to a vocal audiogram, without and with observation of the audiologist's face. A descriptive and analytical statistical analysis was performed (Shapiro-Wilk and t pairs tests adopting the significance level of 0.05 (5%. Results: We noticed better performance in intelligibility with speechreading. The p-value was zero (p < 0.05, so we rejected the null hypothesis, showing that there was statistically significant difference with speechreading; the same conclusion was obtained by analysis of the confidence intervals. Conclusions: Individuals with presbycusis in this study, performed better on spoken word intelligibility when the hearing of those words was associated with speechreading. This phenomenon helps in such a way that observation of the interlocutor's face works like a "third ear".

  8. "Play It by Ear"--Teachers' Responses to Ear-Playing Tasks during One-to-One Instrumental Lessons

    Science.gov (United States)

    Varvarigou, Maria

    2014-01-01

    This paper reports findings from the Ear-Playing Project in relation to the teaching strategies that 15 instrumental teachers adopted during one-to-one instrumental lessons whilst helping their students to copy music by ear from a recording. Overall, the teachers used a variety of strategies including singing and humming along with or without the…

  9. Characterization of Treponema spp. isolates from pigs with ear necrosis and shoulder ulcers.

    Science.gov (United States)

    Svartström, Olov; Karlsson, Frida; Fellström, Claes; Pringle, Märit

    2013-10-25

    Ear necrosis and shoulder ulcers in pigs are animal welfare problems and ethical issues that can cause economic losses for producers. Spirochetes have been observed microscopically in scrapings from pig ulcers since the early 1900s, but have until recently not been cultured and therefore not characterized. In this study, 12 Treponema spp. isolates were acquired from porcine ear necrosis, shoulder ulcers and gingiva. DNA analysis of the 16S rRNA-tRNA(Ile) intergenic spacer region (ISR2) or the 16S rRNA gene revealed relatedness to oral treponemes found in dogs and humans. All isolates except one aligned into two clusters, Treponema pedis and Treponema sp. OMZ 840-like. The 16S rRNA gene of the remaining isolate shared 99% nucleotide identity with Treponema parvum. Genetic fingerprinting of the isolates was performed through random amplification of polymorphic DNA (RAPD). In addition, the isolates were characterized by biochemical tests, including api(®)ZYM, tryptophanase and hippuricase activity, and by testing the antimicrobial susceptibility to tiamulin, valnemulin, tylosin, tylvalosin, lincomycin and doxycycline using broth dilution. All isolates except two showed unique RAPD fingerprints, whereas metabolic activity tests could not differentiate between the isolates. The MICs of all antimicrobial agents tested were low. Copyright © 2013 Elsevier B.V. All rights reserved.

  10. Statistical Shape Analysis of the Human Ear Canal with Application to In-the-Ear Hearing Aid Design

    DEFF Research Database (Denmark)

    Paulsen, Rasmus Reinhold

    2004-01-01

    This thesis is about the statistical shape analysis of the human ear canal with application to the mechanical design of in-the-ear hearing aids. Initially, it is described how a statistical shape model of the human ear canal is built based on a training set of laser-scanned ear impressions. A thin...... plate spline based approach creates a dense correspondence between the shapes in training set. In addition, a new flexible, non-rigid registration framework is proposed and used to optimise the correspondence ¯eld. The framework is based on Markov Random Field regularisation and is motivated by prior...... work on image restoration. It is shown how the method significantly improves the shape model. In the second part of the thesis, the shape model is used in software tools that mimic the skills of the expert hearing aid makers. The first result is that it is possible to learn an algorithm to cut an ear...

  11. THE IDENTIFICATION OF EAR PRINTS USING COMPLEX GABOR FILTERS

    Directory of Open Access Journals (Sweden)

    Alexander A S Gunawan

    2012-05-01

    Full Text Available Biometrics is a method used to recognize humans based on one or a few characteristicsphysical or behavioral traits that are unique such as DNA, face, fingerprints, gait, iris, palm, retina,signature and sound. Although the facts that ear prints are found in 15% of crime scenes, ear printsresearch has been very limited since the success of fingerprints modality. The advantage of the useof ear prints, as forensic evidence, are it relatively unchanged due to increased age and have fewervariations than faces with expression variation and orientation. In this research, complex Gaborfilters is used to extract the ear prints feature based on texture segmentation. Principal componentanalysis (PCA is then used for dimensionality-reduction where variation in the dataset ispreserved. The classification is done in a lower dimension space defined by principal componentsbased on Euclidean distance. In experiments, it is used left and right ear prints of ten respondentsand in average, the successful recognition rate is 78%. Based on the experiment results, it isconcluded that ear prints is suitable as forensic evidence mainly when combined with otherbiometric modalities.Keywords: Biometrics; Ear prints; Complex Gabor filters; Principal component analysis;Euclidean distance

  12. An in vitro model of murine middle ear epithelium

    Directory of Open Access Journals (Sweden)

    Apoorva Mulay

    2016-11-01

    Full Text Available Otitis media (OM, or middle ear inflammation, is the most common paediatric disease and leads to significant morbidity. Although understanding of underlying disease mechanisms is hampered by complex pathophysiology it is clear that epithelial abnormalities underpin the disease. There is currently a lack of a well-characterised in vitro model of the middle ear (ME epithelium that replicates the complex cellular composition of the middle ear. Here, we report the development of a novel in vitro model of mouse middle ear epithelial cells (mMECs at an air–liquid interface (ALI that recapitulates the characteristics of the native murine ME epithelium. We demonstrate that mMECs undergo differentiation into the varied cell populations seen within the native middle ear. Proteomic analysis confirmed that the cultures secrete a multitude of innate defence proteins from their apical surface. We showed that the mMECs supported the growth of the otopathogen, nontypeable Haemophilus influenzae (NTHi, suggesting that the model can be successfully utilised to study host–pathogen interactions in the middle ear. Overall, our mMEC culture system can help to better understand the cell biology of the middle ear and improve our understanding of the pathophysiology of OM. The model also has the potential to serve as a platform for validation of treatments designed to reverse aspects of epithelial remodelling that underpin OM development.

  13. A DESCRIPTIVE STUDY OF FUNGAL INFECTIONS IN CHRONICALLY DISCHARGING EARS

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    Sujatha

    2015-08-01

    Full Text Available BACKGROUND : Chronic Suppurative Otitis Media (CSOM is a disease of multiple aetiology and well known for its persis tence and recurrence inspite of treatment and are the bearbug of otologist, paediatrician and general practitioner. One of the reason s for the refractoriness to treatment and chronicity is coexist ing fungal infection of the ear. OBJECTIVES: Are to find out the prevalence of fungal infections in chronic discharging ears and to identify and isolate the type of fungus prevalent in these ears . MATERIALS AND METHOD S: Tertiary care hospital level descrip tive study was conducted in 50 cases of CSOM with actively discharging ears for a period of one year starting from February 2013. For all the cases aural swabs were collected from the diseased ear and were used for direct microscopic examination in potassi um hydroxide wet mount. Ear swab was cultured on Sabouraud’s dextrose agar plate for fungal cultures. The patient characteristics were prospectively recorded and results were analysed. CONCLUSION : There is high prevalence of coexisting fungal infection in actively discharging ears of CSOM patients

  14. 3D visualization of middle ear structures

    Science.gov (United States)

    Vogel, Uwe; Schmitt, Thomas

    1998-06-01

    The achievement of volume geometry data from middle ear structures and surrounding components performs a necessary supposition for the finite element simulation of the vibrational and transfer characteristics of the ossicular chain. So far those models base on generalized figures and size data from anatomy textbooks or particular manual and one- or two-dimensional distance measurements of single ossicles, mostly obtained by light microscopy, respectively. Therefore the goal of this study is to create a procedure for complete three-dimensional imaging of real middle ear structures (tympanic membrane, ossicles, ligaments) in vitro or even in vivo. The main problems are their microscopic size with relevant structures from 10 micrometer to 5 mm, representing various tissue properties (bone, soft tissue). Additionally, these structures are surrounded by the temporal bone, the most solid bone of the human body. Generally there exist several established diagnostic tools for medical imaging that could be used for geometry data acquisition, e.g., X-ray computed tomography and magnetic resonance imaging. Basically they image different tissue parameters, either bony structures (ossicles), or soft tissue (tympanic membrane, ligaments). But considering this application those standard techniques allow low spatial resolution only, usually in the 0.5 - 1mm range, at least in one spatial direction. Thus particular structures of the middle ear region could even be missed completely because of their spatial location. In vitro there is a way out by collecting three complete data sets, each distinguished by 90 degree rotation of a cube-shaped temporal bone specimen. That allows high-resolution imaging in three orthogonal planes, which essentially supports the three-dimensional interpolation of the unknown elements, starting from the regularly set elements of the cubic grid with an edge extension given by the original two-dimensional matrix. A different approach represents the

  15. The ear and its malformations: strange beliefs and misconceptions.

    Science.gov (United States)

    Gamatsi, Irene E; Nikolopoulos, Thomas P; Lioumi, Dimitra E

    2003-06-01

    To explore the strange beliefs and misconceptions related to the ear and its malformations, and how these have changed from ancient times until today. Ancient documents, journal articles, and history books were studied to research ancient and current beliefs and misconceptions with regard to the ear and its malformations. The ear has been the centre of various beliefs and misconceptions through human history. Discoveries in the area of Assyria and Babylonia have revealed that the inhabitants of these countries not only had documented various congenital dysplasias of the ear but also they believed that these malformations had prophetical meaning and implied hereditary disorders. These observations and prophecies may very well have their origin to the 4th millennium BC. Egyptian and Greek-Roman medicine had suggested strange connections of the ear with close or remote parts of the human body and similar beliefs can be found through the later centuries. Hebrew and Greek-Byzantine conceptions of the perfect appearance that priests or kings should have, led to exclusion of people who had congenital ear malformations and even to mutilation (cutting off the ears) as a method of punishment. The present study illustrates the wide variety and the long history of misconceptions related to children born with congenital malformations of the pinna and the external ear canal. These misconceptions may have led to a conscious and subconscious anxiety and pressure from parents and patients to ENT and plastic surgeons to correct the ear malformations as soon as possible in order to avoid psychological and social problems.

  16. 3D ear identification based on sparse representation.

    Directory of Open Access Journals (Sweden)

    Lin Zhang

    Full Text Available Biometrics based personal authentication is an effective way for automatically recognizing, with a high confidence, a person's identity. Recently, 3D ear shape has attracted tremendous interests in research field due to its richness of feature and ease of acquisition. However, the existing ICP (Iterative Closet Point-based 3D ear matching methods prevalent in the literature are not quite efficient to cope with the one-to-many identification case. In this paper, we aim to fill this gap by proposing a novel effective fully automatic 3D ear identification system. We at first propose an accurate and efficient template-based ear detection method. By utilizing such a method, the extracted ear regions are represented in a common canonical coordinate system determined by the ear contour template, which facilitates much the following stages of feature extraction and classification. For each extracted 3D ear, a feature vector is generated as its representation by making use of a PCA-based local feature descriptor. At the stage of classification, we resort to the sparse representation based classification approach, which actually solves an l1-minimization problem. To the best of our knowledge, this is the first work introducing the sparse representation framework into the field of 3D ear identification. Extensive experiments conducted on a benchmark dataset corroborate the effectiveness and efficiency of the proposed approach. The associated Matlab source code and the evaluation results have been made publicly online available at http://sse.tongji.edu.cn/linzhang/ear/srcear/srcear.htm.

  17. Trends and complications of ear piercing among selected Nigerian population

    Directory of Open Access Journals (Sweden)

    Olajide Toye Gabriel

    2017-01-01

    Full Text Available Background: The reported health and socioeconomic consequences of ear piercing, especially in modern day society, underscore the need to further research into this subject. In this study, we determine the trends and complications of ear piercing among selected Nigerian population. Aim and Objectives: The aim and objective of this study was to draw attention to the trends and complications of ear piercing with a view to prevent its associated complications. Methodology: It is a descriptive cross-sectional study carried out between February and May 2015 among selected Nigerian population from two of its six geo-political zones. A self-administered semi-structured questionnaire which had been pretested was used to collect data from 458 respondents who consented using multistage sampling technique. Results: Of 480 respondents enumerated, 458 completed the questionnaires and gave their biodata. The male:female ratio was 1:6.2. Their ages ranged from 18 to 75 years with a mean of 35.56 ± 10.16. About 35.4% of the respondents were within the age group of 31–40 years. Majority of the respondents, i.e.,79.3% practiced ear piercing on their children. Most of them (86.8% preferred single piercing. Ear piercing was performed within the 1st week of birth in 37.2% of the respondents. Large percentage (93.2% of the respondents will not encourage ear piercing in male children. Nearly 20.5% of the respondents observed complications. Conclusion: Ear piercing remained a common practice in Nigeria, with respondents preferring it on females. Majority of the piercings are done in childhood and by untrained personnel. Keloid formation was the notable complication observed by the respondents. There is a need to increase awareness about the hazards of ear piercings and to enact laws that regulate ear piercings particularly in children which is hereby stretched.

  18. Inner-ear decompression sickness in nine trimix recreational divers.

    Science.gov (United States)

    Guenzani, Silvia; Mereu, Diego; Messersmith, Mark; Olivari, Diego; Arena, Mario; Spanò, Andrea

    2016-06-01

    Recreational technical diving, including the use of helium-based mixes (trimix) and the experimentation of new decompression algorithms, has become increasingly popular. Inner-ear decompression sickness (DCS) can occur as an isolated clinical entity or as part of a multi-organ presentation in this population. Physiological characteristics of the inner ear make it selectively vulnerable to DCS. The inner ear has a slower gas washout than the brain thus potentially making it more vulnerable to deleterious effects of any bubbles that cross a persistent foramen ovale (PFO) and enter the basilar artery, whilst the inner ear remains supersaturated but the brain does not. A questionnaire was made widely available to divers to analyse the incidence of inner-ear DCS after technical dives. One-hundred-and-twenty-six divers submitted completed questionnaires, and we studied each incident in detail. Nine (7.1%) of the 126 responders reported to have had at least one episode of inner-ear DCS, of which seven occurred without having omitted planned decompression stops. Of these seven, four suffered from DCS affecting just the inner ear, while three also had skin, joint and bladder involvement. Five of the nine divers affected were found to have a PFO. All affected divers suffered from vestibular symptoms, while two also reported cochlear symptoms. Three divers reported to have balance problems long after the accident. This small study is consistent with a high prevalence of PFO among divers suffering inner-ear DCS after trimix dives, and the pathophysiological characteristics of the inner ear could contribute to this pathology, as described previously. After an episode of DCS, vestibular and cochlear injury should always be examined for.

  19. Improving biodiversity assessment of anuran amphibians using DNA barcoding of tadpoles. Case studies from Southeast Asia.

    Science.gov (United States)

    Grosjean, Stéphane; Ohler, Annemarie; Chuaynkern, Yodchaiy; Cruaud, Corinne; Hassanin, Alexandre

    2015-05-01

    Amphibian populations are dramatically declining, while their inventory is far from being achieved. Tadpoles are usually overlooked from biodiversity survey, whereas their consideration will optimize species counts and knowledge of their ecological and developmental requirements is essential in conservation planning. Two mitochondrial markers, 16S (397 new sequences obtained) and COI (343 new sequences obtained), are used to test DNA barcoding on a set of larval and adult Asian amphibians represented by 83 recognized species from 65 sites. The advantages and drawbacks of each marker are assessed, COI barcoding being advocated for global DNA barcoding, whereas 16S suits for taxonomically or geographically restricted DNA barcoding. About half of the collected tadpoles were badly identified or incompletely named in the field. All tadpole sequences (except one case of probable introgressive hybridization) were correctly assigned to their respective species. Finally six clusters of tadpole sequences without conspecific adults were revealed, stressing the importance of collecting and taking into account tadpoles in biodiversity survey and conservation planning. Copyright © 2015 Académie des sciences. Published by Elsevier SAS. All rights reserved.

  20. Shape and Deformation Analysis of the Human Ear Canal

    DEFF Research Database (Denmark)

    Darkner, Sune

    is on the extraction and analysis of the shape and deformation of the ear canal due to movements of the mandible, leaning over, and turning of the head. Methods for surface registration with focus on non-rigid registration are presented, as well as a wide range of statistical methods used for analyzing the shapes...... and deformation fields. The results show that the ear canal changes shape significantly in all subjects and that the deformation is more complicated than previously described in the literature. It is shown that the deformation at specific locations in the ear is significantly correlated to comfort issues reported...

  1. Acute effects of irradiation on middle ear mucosa

    Energy Technology Data Exchange (ETDEWEB)

    Ohashi, Y.; Nakai, Y.; Esaki, Y.; Ikeoka, H.; Koshimo, H.; Onoyama, Y.

    1988-03-01

    Single field, fixed irradiation of bilateral tympanic cavities using 200-kV x-rays was administered to five guinea pigs. The irradiation dose was 30 Gy. They were killed immediately after irradiation, and bilateral middle ear mucosa was examined for ciliary activity and epithelial structure. Significant deterioration of the ciliary activity in the middle ear mucosa was observed, proximal as well as distal to the eustachian tube. Electron microscopy showed various changes in the irradiated middle ear mucosa. The most conspicuous findings were hyperreactivity in secretion, vacuolation of ciliated cells, and stomal edema.

  2. Magnetostratigraphy of the Moenkopi Formation at Bears Ears, Utah

    Science.gov (United States)

    Lienert, Barry R.; Helsley, C. E.

    1980-03-01

    We have performed a paleomagnetic study on over 200 oriented samples collected from the Lower Triassic Moenkopi Formation at Bears Ears in southeastern Utah. Seven intervals of normal and reversed magnetic polarities are present at the Bears Ears site. We have correlated these magnetozones to a similar set established in the same formation 130 km to the northeast. At Bears Ears, magnetozone boundaries occur in different lithologic members of the Moenkopi Formation than corresponding magnetozone boundaries present in the section to the northeast. We conclude that contemporaneous lateral variations of sediment type and environement are a characteristic feature of the Moenkopi Formation.

  3. COMPARISON OF DIET AND USE OF BROMELIADS BETWEEN A BROMELICOLOUS AND A BROMELIGENOUS ANURAN AT AN INSELBERG IN THE SOUTHEASTERN OF BRAZIL

    Directory of Open Access Journals (Sweden)

    PERTEL WESLEI

    2010-06-01

    Full Text Available Anurans from an inselberg in southeastern Brazil were studied using a sample ofsixty tank of bromeliads Alcantharea sp. We found 153 tadpoles of S. arduous, 21adults of S. arduous, 30 adults of T. miliaris, and two adults of Scinax x-signatus,which were not considered in our analyses. Tadpoles of S. arduous were present in35% of the analyzed plants. Adults of S. arduous (bromeligeneous occurred in 25%of analyzed plants, while adults of T. miliaris (bromelicolous occurred in 30%.Apparently the presence of toe pads in S. arduous allow them to occupy the centerportion of bromeliads, while T. miliaris, which lack pads on their toes, were foundon the base of the plant axils. The number of anuran species and the abundance ofindividuals found were low. This may be a result of the high altitude of our studiedsite or a restriction imposed by the saxicolous environment, such as high temperaturesand low humidity during the day. Both species can be considered generalist feedersdue to their wide variety of ingested prey. Formicidae was their main prey but wasabsent segregation in the bromeliads. Blattodea was very common inside the bromeliadaxils and represented the most signifi cant prey by weight in both frog species. Weconclude that both anurans forage inside and outside of bromeliads. Trophic nichebreadth in S. arduous was larger than in T. miliaris. Even both species being commoninhabitants of the same environment, they demonstrated a marked spatial segregationin the bromeliads. Based on their diet, however, there may be disputes for territoryoutside of the bromeliads.

  4. Audio-Tutorial Programming with Exceptional Children

    Science.gov (United States)

    Hofmeister, Alan

    1973-01-01

    The findings from the application of audio-tutorial programing in three curriculum areas with three groups of exceptional children are reported. The findings suggest that audio-tutorial programing has qualities capable of meeting some of the instructional needs of exceptional children. (Author)

  5. Ghrelin receptor in two species of anuran amphibian, bullfrog (Rana catesbeiana and Japanese tree frog (Hyla japonica

    Directory of Open Access Journals (Sweden)

    Hiroyuki eKaiya

    2011-09-01

    Full Text Available We identified cDNA encoding a functional growth hormone secretagogue-receptor 1a (GHS-R1a, ghrelin receptor in two species of anuran amphibian, bullfrog (Rana catesbeiana and Japanese tree frog (Hyla japonica. Deduced receptor protein for bullfrog and Japanese tree frog (tree frog was comprised of 374- and 371-amino acids, respectively. The two receptors showed 86% identity with each other, and phylogenetic analysis revealed that the two receptors belong to the same category with tetrapods. In functional analyses, ghrelin and GHS-R1a agonists increased intracellular Ca2+ concentration in HEK293 cell that transfected each receptor cDNA, but ligand selectivity of ghrelin with Ser3 and Thr3 was not observed between the two receptors. Bullfrog GHS-R1a mRNA was mainly expressed in the brain, stomach and testis. In the brain, the gene expression was detected in the diencephalon and mesencephalon, but not in the pituitary. Tree frog GHS-R1a mRNA was predominantly expressed in the gastrointestinal tract and ovary, but not detected in the pituitary. In bullfrog stomach, GHS-R1a mRNA expression increased at 10 days after fasting, but not in the brain. In tree frog, GHS-R1a mRNA expression increased in the brain, stomach and ventral skin by 10-days fasting, and in the stomach and ventral skin by a dehydration treatment. Intracerebroventricular injection of ghrelin in dehydrated tree frog did not affect water absorption from the ventral skin. These results suggest that ghrelin is involved in energy homeostasis and possibly in osmoregulation in frogs.

  6. Morphological and life-history responses of anurans to predation by an invasive crayfish: an integrative approach.

    Science.gov (United States)

    Nunes, Ana L; Orizaola, Germán; Laurila, Anssi; Rebelo, Rui

    2014-04-01

    Predator-induced phenotypic plasticity has been widely documented in response to native predators, but studies examining the extent to which prey can respond to exotic invasive predators are scarce. As native prey often do not share a long evolutionary history with invasive predators, they may lack defenses against them. This can lead to population declines and even extinctions, making exotic predators a serious threat to biodiversity. Here, in a community-wide study, we examined the morphological and life-history responses of anuran larvae reared with the invasive red swamp crayfish, Procambarus clarkii, feeding on conspecific tadpoles. We reared tadpoles of nine species until metamorphosis and examined responses in terms of larval morphology, growth, and development, as well as their degree of phenotypic integration. These responses were compared with the ones developed in the presence of a native predator, the larval dragonfly Aeshna sp., also feeding on tadpoles. Eight of the nine species altered their morphology or life history when reared with the fed dragonfly, but only four when reared with the fed crayfish, suggesting among-species variation in the ability to respond to a novel predator. While morphological defenses were generally similar across species (deeper tails) and almost exclusively elicited in the presence of the fed dragonfly, life-history responses were very variable and commonly elicited in the presence of the invasive crayfish. Phenotypes induced in the presence of dragonfly were more integrated than in crayfish presence. The lack of response to the presence of the fed crayfish in five of the study species suggests higher risk of local extinction and ultimately reduced diversity of the invaded amphibian communities. Understanding how native prey species vary in their responses to invasive predators is important in predicting the impacts caused by newly established predator-prey interactions following biological invasions.

  7. Effects of Grazing Management and Cattle on Aquatic Habitat Use by the Anuran Pseudopaludicola mystacalis in Agro-Savannah Landscapes.

    Directory of Open Access Journals (Sweden)

    Rodolfo M Pelinson

    Full Text Available Because of their strong dependence on the environment, the spatial distribution of pond-breeding amphibians can be greatly influenced by anthropogenic habitat alteration. In some agricultural landscapes in Brazil, the anuran Pseudopaludicola mystacalis appears to be highly influenced by land use. Because adult males and tadpoles of this species are usually found in marshy areas with cattle hoof prints, we hypothesized that P. mystacalis preferentially occupies aquatic habitats with marshy areas that are trampled by cattle. To test our hypothesis, we assessed whether the occurrence of P. mystacalis is associated with the presence of cattle and trampled marshy areas, and which environmental features best explain the spatial distribution and abundance of P. mystacalis. To do so, we sampled 38 aquatic habitats in an area intensely used for livestock in southeastern Brazil. We found that the presence of cattle and trampled marshy areas in aquatic habitats are positively associated to P. mystacalis occurrence. Additionally, the abundance of calling males is better predicted by variables of landscape and local habitat structure. Specifically, the size of trampled marshy areas and the proportion of herbaceous vegetation within the aquatic habitat are positively associated with abundance, while distance to nearest aquatic habitat are negatively associated with abundance of calling males. All three of these variables can be directly or indirectly linked to the presence of cattle or grazing management. Therefore, this work shows evidence that Pseudopaludicola mystacalis is positively influenced by grazing management with cattle, and draws attention to other unknown potential consequences of different land use to fresh water diversity.

  8. North American Amphibian Monitoring Program (NAAMP) anuran detection data from the eastern and central United States (1994-2015)

    Science.gov (United States)

    Foreman, Tasha M.; Grant, Evan H. Campbell; Weir, Linda A.

    2017-01-01

    The North American Amphibian Monitoring Program (NAAMP) was a collaborative citizen science effort between the US Geological Survey (USGS) and 26 Partners (state agencies, universities, and nonprofits) for monitoring calling amphibian populations over much of the eastern and central United States. Initiated in 1997 in response to needs set forth by the Declining Amphibian Populations Task Force in 1994 regarding increased anecdotal observations of global amphibian declines, NAAMP was designed to provide scientifically and statistically defensible, long-term distribution and trends data for calling amphibian populations at the state and regional level in the United States. The USGS discontinued coordination of the program at the conclusion of the 2015 field season. Modeled after the USGS Breeding Bird Survey, NAAMP used a network of random and state-requested non-random roadside routes with listening stops near wetlands to collect frog and toad occupancy and environmental data in predominantly unprotected lands. Data collection and verification under a unified protocol began in 2001 and continued through 2015 with the addition of observer assessment scores in 2006. The USGS utilized verified 2001-2015 data from random routes to produce occupancy trend reports for anuran species of the Northeast, Southeast, and Midwest regions and states of the United States. This dataset includes all raw, verified NAAMP data from 1997 through 2015 and also raw, verified data from Partner States that precede the program (1994-1996). Data preceding 2001 followed variations of the unified protocol. Please refer to metadata for additional information regarding protocol and a list of the represented states and see the Species.csv file for the list of 58 represented species.

  9. Pelvic function in anuran jumping: Interspecific differences in the kinematics and motor control of the iliosacral articulation during take-off and landing.

    Science.gov (United States)

    Reilly, Steve M; Montuelle, Stephane J; Schmidt, Andre; Krause, Cornelia; Naylor, Emily; Jorgensen, Michael E; Essner, Richard L

    2016-12-01

    Although the anuran pelvis is thought to be adapted for jumping, the function of the iliosacral joint has seen little direct study. Previous work has contrasted the basal "lateral-bender" pelvis from the "rod-like" pelvis of crown taxa hypothesized to function as a sagittal hinge to align the trunk with take-off forces. We compared iliosacral movements and pelvic motor patterns during jumping in the two pelvic types. Pelvic muscle activity patterns, iliosacral anteroposterior (AP) movements and sagittal bending of the pelvis during the take-off and landing phases were quantified in lateral bender taxa Ascaphus (Leiopelmatidae) and Rhinella (Bufonidae) and the rod-like Lithobates (Ranidae). All three species exhibit sagittal extension during take-off, therefore, both pelvic types employ a sagittal hinge. However, trunk elevation occurs significantly earlier in the anuran rod-like pelvis. Motor patterns confirm that the piriformis muscles depress the urostyle while the longissimus dorsi muscles elevate the trunk during take-off. However, the coccygeoiliacus muscles also produce anterior translation of the sacrum on the ilia. A new model illustrates how AP translation facilitates trunk extension in the lateral-bender anurans that have long been thought to have limited sagittal bending. During landing, AP translation patterns are similar because impact forces slide the sacrum from its posterior to anterior limits. Sagittal flexion during landing differs among the three taxa depending on the way the species land. AP translation during landing may dampen impact forces especially in Rhinella in which pelvic function is tuned to forelimb-landing dynamics. The flexibility of the lateral-bender pelvis to function in sagittal bending and AP translation helps to explain the retention of this basal configuration in many anurans. The novel function of the rod-like pelvis may be to increase the rate of trunk elevation relative to faster rates of energy release from the hindlimbs

  10. More invaders do not result in heavier impacts: The effects of non-native bullfrogs on native anurans are mitigated by high densities of non-native crayfish.

    Science.gov (United States)

    Liu, Xuan; Wang, Supen; Ke, Zunwei; Cheng, Chaoyuan; Wang, Yihua; Zhang, Fang; Xu, Feng; Li, Xianping; Gao, Xu; Jin, Changnan; Zhu, Wei; Yan, Shaofei; Li, Yiming

    2017-12-28

    With accelerating species introductions in an era of globalization, co-occurring alien species have become increasingly common. Understanding the combined ecological impacts of multiple invaders is not only crucial for wildlife managers attempting to ameliorate biodiversity loss, but also provides key insights into invasion success and species coexistence mechanisms in natural ecosystems. Compared with much attentions given to single-invader impacts, little is known about the impacts of multiple co-occurring invaders. The American bullfrog (Lithobates catesbeianus = Rana catesbeiana) and the red swamp crayfish (Procambarus clarkii) are two aquatic invasive species in many different areas of the globe. They coexist with native anurans in a variety of permanent lentic waters, which provide an ideal model system to explore the combined effects of multiple invaders from different trophic levels on native species. Based on a global diet analysis covering 34 native and invasive bullfrog populations, and data from 10-year field surveys across 157 water bodies in the Zhoushan Archipelago, China, we observed a reduced impact of bullfrogs on native anurans at high crayfish densities when the two invaders co-occurred. The global diet analysis showed that crayfish occurrence reduced the number of native anuran prey consumed by bullfrogs in both native and invasive populations. After accounting for pseudoreplication of different observations among water bodies, islands, and survey time, model averaging analyses based on GLMMs showed a negative relationship between bullfrog density and native anuran densities for field observations of invasive bullfrogs alone and co-invaded observations with low crayfish density. However, this negative relationship disappeared when the two invaders co-occurred with high crayfish density. Structural equation modelling (SEM) analyses further validated that the impacts of bullfrogs on native frogs were mitigated by the negative interactions

  11. Penetration of ceftibuten into middle ear fluid.

    Science.gov (United States)

    Lin, C; Kumari, P; Perrotta, R J; Reidenberg, B E

    1996-06-01

    The penetration of ceftibuten, an extended-spectrum oral cephalosporin, into middle ear fluid (MEF) was evaluated in pediatric patients during a course of daily oral doses of 9 mg/kg of body weight for 10 days. Plasma and MEF collected at 2, 4, 6, or 12 h after at least 3 days of dosing were analyzed for ceftibuten by a high-pressure liquid chromatography method, and the data were used to calculate pharmacokinetic parameters. Plasma and MEF had almost identical maximum concentrations (Cmax) of ceftibuten (14 micrograms/ml). These Cmax values in MEF during acute otitis media were well in excess of the MIC for 90% of the isolates of each of four major pathogens in this disease. The time to Cmax was longer in MEF (4 h) than in plasma (2 h). Excellent penetration (71%) of ceftibuten into MEF was observed on the basis of the area under the curve ratio (MEF/plasma). These data clearly indicate that ceftibuten penetrated well into the MEF to yield clinically effective concentrations.

  12. Blackbody for metrological control of ear thermometers

    Science.gov (United States)

    Cárdenas-García, D.; Méndez-Lango, E.

    2013-09-01

    Body temperature is an important parameter in medical practice, and most of health diagnoses are made based upon measured temperature values. Non-contact measurements are attractive to both patients and physicians, and ear thermometers (ET) are part of the set of infrared thermometers for medical applications. ETs sense the tympanic membrane temperature which best represents body temperature. They take advantage of the natural high effective emissivity cavity that is formed as radiation source. To calibrate or to check the performance of ETs, we designed a high-emissivity spherical cavity as a blackbody source which can be placed in a dry block oven. Although the blackbody cavity can have any shape, we decided to build it spherical because its effective emissivity can be easily calculated in a closed form. The cavity is made of Aluminum to take advantage of its high thermal conductivity while its inner side is covered with a black paint to increase the cavity effective emissivity. Based on paint emissivity measurements and the geometrical shape, we calculated that the cavity has an effective emissivity higher than 0.999. Blackbody temperature is measured with a calibrated contact thermometer placed inside the bottom wall of the cavity. We present the design of the cavity, the experimental setup, and results of three commercial ETs compared with this cavity.

  13. Primary culture of chinchilla middle ear epithelium.

    Science.gov (United States)

    Nakamura, A; DeMaria, T F; Lim, D J; van Blitterswijk, C A

    1991-09-01

    Chinchilla middle ear epithelium was successfully cultured in medium containing Dulbecco's modified Eagle's medium, Ham's F12 mixture, and fetal bovine serum. After 3 to 5 days, the explants produced outgrowths of primarily flat polygonal and ciliated cells that persisted for up to 10 days in culture. These cells in the outgrowth often formed a "dome" indicating the presence of functional polarization and fluid transportation capability. The ciliated cells were more frequently found near the explant, and were fewer in number in the area distant from the explant. This finding suggests that the ciliated cells in the outgrowth are migrated ciliated cells deriving from the explant. That secretory cells were not identified in the outgrowth indicated that the present culture technique did not support secretory activity. Using the present culture technique, we were able to maintain the explants and primary cultured cells for up to 14 days in a majority of cases; hence, these techniques appear to be applicable to a number of in vitro studies.

  14. Ear-body lift and a novel thrust generating mechanism revealed by the complex wake of brown long-eared bats (Plecotus auritus)

    DEFF Research Database (Denmark)

    Johansson, L Christoffer; Håkansson, Jonas; Jakobsen, Lasse

    2016-01-01

    Large ears enhance perception of echolocation and prey generated sounds in bats. However, external ears likely impair aerodynamic performance of bats compared to birds. But large ears may generate lift on their own, mitigating the negative effects. We studied flying brown long-eared bats, using...... high resolution, time resolved particle image velocimetry, to determine the aerodynamics of flying with large ears. We show that the ears and body generate lift at medium to cruising speeds (3-5 m/s), but at the cost of an interaction with the wing root vortices, likely reducing inner wing performance...

  15. Decline in Kids' Ear Infections Linked to Pneumococcal Vaccine

    Science.gov (United States)

    ... Decline in Kids' Ear Infections Linked to Pneumococcal Vaccine The shots are effective in killing the main ... compared to the 1980s, largely due to pneumococcal vaccines that protect against one type of bacteria that ...

  16. Chronic inflammatory middle ear disease: Postoperative CT and MRI findings

    Directory of Open Access Journals (Sweden)

    Nivan Hany Khater

    2015-09-01

    Conclusion: CT and MRI are both safe non-invasive diagnostic methods. Both procedures can provide radiologists a confident diagnosis of postoperative middle ear complications, assisting otologists with a provisional diagnosis for a better management.

  17. Revision Stapedectomy in a Female Patient with Inner Ear Malformation

    Directory of Open Access Journals (Sweden)

    Tirth R. Patel

    2016-01-01

    Full Text Available Objectives. We describe an unusual case of surgical management of congenital mixed hearing loss in a female patient with inner ear malformation. This report outlines the role of temporal bone imaging and previous surgical history in evaluating a patient’s risk of perilymph gusher during stapes surgery. Methods. A 68-year-old female patient with a history of profound bilateral mixed hearing loss due to ossicular and cochlear malformation presented to our otology clinic. She had undergone multiple unsuccessful previous ear surgeries. Computed tomography revealed bilateral inner ear malformations. She elected to proceed with revision stapedectomy. Results. The patient received modest benefit to hearing, and no operative complications occurred. Conclusions. Although stapedectomy has been shown to improve hearing in patients with stapes fixation, there is risk of perilymph gusher in patients with inner ear abnormalities. Evaluation and counseling of the risk of gusher during stapes surgery should be done on a case-by-case basis.

  18. [Reconstruction of the ear in the burns patient].

    Science.gov (United States)

    Carrillo-Córdova, Jorge Raúl; Jiménez Murat, Yusef; Apellaniz-Campo, Armando; Bracho-Olvera, Hazel; Carrillo Esper, Raúl

    Face burns are a singular pathology with great functional and psychological impact in the patients suffering them. The ears play a fundamental role in personal interactions and damage to this organ results in physical and emotional distress. The reconstructive treatment of the burned ear is a challenge. Multiple procedures have been described to achieve success in the reconstruction of the burned ear; immediate reconstruction with autologous rib cartilage, secondary reconstruction, alloplastic material reconstruction, tissue expansion, skin grafts and also microvascular flaps are some of the most common procedures used in this patients. All these techniques focus on giving a natural appearance to the patient. Burns to the ears affect 30% of the patients with facial burns, they require an excellent treatment given by a multidisciplinary team. Copyright © 2017 Academia Mexicana de Cirugía A.C. Publicado por Masson Doyma México S.A. All rights reserved.

  19. Detection of Combat Sounds by the Human Ear

    Science.gov (United States)

    1976-01-01

    frequency analysis every 20 msec, com- bined the results into critical bands, Integrated for 200 msec, and then searched to find the 200 msec period...arrives. To allow for this variable in the detection model, pure tone thresholds were measured for each ear. Audiometry was conducted for each ear with...product-moment correla- tion coefficient was calculated for each sound. RESULTS AND DISCUSSION Spectra of the Test Sounds Examples of the sound spectra

  20. Prevalence of external ear disorders in Belgian stray cats.

    Science.gov (United States)

    Bollez, Anouck; de Rooster, Hilde; Furcas, Alessandra; Vandenabeele, Sophie

    2017-04-01

    Objectives Feline otitis externa is a multifactorial dermatological disorder about which very little is known. The objective of this study was to map the prevalence of external ear canal disorders and the pathogens causing otitis externa in stray cats roaming around the region of Ghent, Belgium. Methods One hundred and thirty stray cats were randomly selected during a local trap-neuter-return programme. All cats were European Shorthairs. This study included clinical, otoscopic and cytological evaluation of both external ears of each cat. Prospective data used as parameters in this study included the sex, age and body condition score of each cat, as well as the presence of nasal and/or ocular discharge, and the results of feline immunodeficiency virus (FIV) and feline leukaemia virus (FeLV) Snap tests. Results Remarkably, very few (sub)clinical problems of the external ear canal were found in the stray cat population. Malassezia species was by far the most common organism found in the external ear canals of the 130 stray cats. A total of 96/130 (74%) cats were found to have Malassezia species organisms present in one or both ears based on the cytological examination. No correlation was found between the parameters of sex, age, body condition score, the presence of nasal and/or ocular discharge and FIV and FeLV status, and the presence of parasites, bacteria or yeasts. Conclusions and relevance This study provides more information about the normal state of the external ear canal of stray cats. The ears of most stray cats are relatively healthy. The presence of Malassezia species organisms in the external ear canal is not rare among stray cats.

  1. Melanoacanthoma of external ear: Report of two cases

    Directory of Open Access Journals (Sweden)

    Rashmi Patnayak

    2013-01-01

    Full Text Available Melanoacanthoma is a rare lesion. Melanoacanthoma of external ear is still rarer . We present two cases of melanoacanthoma of external ear in adults which presented as pigmented growths and clinically were suspected as malignant lesions. Histopathology was diagnostic as it demonstrated the characteristic elevated lesion with abundant melanin pigment. No recurrence of the lesion was reported after four years of initial diagnosis. These cases have been presented because of their uncommon location, highlighting the differential diagnoses.

  2. Middle ear vibrations with SMA prosthesis. Experimental research

    Directory of Open Access Journals (Sweden)

    Rusinek Rafal

    2018-01-01

    Full Text Available The paper focuses on experimental research of a middle ear prosthesis made of shape memory alloy. The prosthesis provides better adjustment to individual patient than classical prosthesis. The shape memory prosthesis is implemented to a fresh temporal bone and vibrations of the round window are recorded by means of the Laser Doppler Vibrometer. Finally, the results are presented in the form of transfer function and compared to the intact and damaged middle ear.

  3. Exceptional Cosmetic surgeries on $S^3$

    OpenAIRE

    Ravelomanana, Huygens C.

    2015-01-01

    This paper concerns the truly or purely cosmetic surgery conjecture. We give a survey on exceptional surgeries and cosmetic surgeries. We prove that the slope of an exceptional truly cosmetic surgery on a hyperbolic knot in $S^3$ must be $\\pm 1$ and the surgery must be toroidal but not Seifert fibred. As consequence we show that there are no exceptional truly cosmetic surgeries on certain types of hyperbolic knot in $S^3$. We also give some properties of Heegaard Floer correction terms and to...

  4. Evaluation of the incidence of bacteremia following middle ear operations

    Directory of Open Access Journals (Sweden)

    Mohammad Naeimi

    2009-01-01

    Full Text Available Introduction: Bacteremia following middle ear surgeries occurs in a significant number of patients. The aim of this study is to investigate the incidence of bacteremia following middle ear surgeries. Materials and Methods: Sixty two patients who where candidates for middle ear operation were enrolled in this study. Blood samples were obtained from each patient immediately before and after operation for bacteriologic analysis. Demographic and middle ear disease characteristics were also recorded for each patient. Results: In 2 culture samples obtained before the operation and in 15 culture samples obtained after the operation, blood cultures were positive. One postoperative sample was excluded from the study due to probability of contamination. Of 14 postoperative cultures, staphylococcus epidermidis and streptococcus pyogenes were positive in 8 and 4 cases, respectively. There were no significant correlations between positive culture and age, otorrhea (duration and odor, surgical approach, type of surgery and pathological condition of patients. Conclusion: Risk of bacteremia following middle ear operations should be considered especially in patients who are high risk for postoperative endocarditis. Considering the serious complications of bacteremia, prophylactic measures are necessary in middle ear operations in this group of patients.    

  5. Prevalence of middle ear disorders in coal miners

    Energy Technology Data Exchange (ETDEWEB)

    Lempert, B.L.; Hopkinson, N.T.; Keith, R.W.; Motl, M.L.; Horine, J.

    1981-06-01

    Results are presented from a study of the prevalence of middle and external ear disorders in coal miners who work underground. The study followed from an earlier NIOSH report (1976) that indicated a possibly large number of otoscopic abnormalities in this population of workers. Otoscopic examinations, pure tone air- and bone-conduction audiometry tests, and impedance tests were administered to 350 underground miners and 150 industrial workers not associated with mining. The study was conducted completely within a hospital otolaryngology/audiology clinic setting. Results of the investigation showed a highly similar prevalence of middle ear and ear canal abnormalities in the miner group and the control group (19 percent). Middle ear abnormalities observed in the miners were judged by the examining otolaryngologists to have preceded their experience in the mines and were not related solely to underground noise exposure or coal dust. Nearly half of the subjects who had an air-bone gap had no middle ear abnormality observable by otoscopic examination. There was substantial agreement between the finding of abnormal otoscopy and abnormal tympanometry. By itself, acoustic reflex was not useful in identifying middle ear disorders, since this reflex may be absent for other reasons, including presence of severe sensorineural hearing loss.

  6. Minnesota wolf ear lengths as possible indicators of taxonomic differences

    Science.gov (United States)

    Mech, L. David

    2011-01-01

    Genetic findings suggest that 2 types of wolves, Canis lupus (Gray Wolf) and C. lycaon (Eastern Wolf), and/or their hybrids occupy Minnesota (MN), and this study examines adult wolf ear lengths as a possible distinguisher between these two. Photographic evidence suggested that the Eastern Wolf possesses proportionately longer ears than Gray Wolves. Ear lengths from 22 northwestern MN wolves from the early 1970s and 22 Alaskan wolves were used to represent Gray Wolves, and the greatest length of the sample (12.8 cm) was used as the least length to demarcate Eastern Wolf from Gray Wolf influence in the samples. Twenty-three percent of 112 adult wolves from Algonquin Park in eastern Ontario and 30% of 106 recent adult wolves in northeastern MN possessed ears >12.8 cm. The northeastern MN sample differed significantly from that of current and past northwestern MN wolves. Ear-lengths of wolves in the eastern half of the northeastern MN wolf population were significantly longer than those in the western half of that study area, even though the mean distance between the 2 areas was only 40 km, and the mean length of my 2004–2009 sample was significantly longer than that of 1999–2003. These findings support the hypothesis that Eastern Wolves tend to possess longer ears than do Gray Wolves and suggest a dynamic hybridization process is still underway in MN.

  7. Culture and characterization of rat middle-ear epithelium.

    Science.gov (United States)

    van Blitterswijk, C A; Ponec, M; van Muijen, G N; Wijsman, M C; Koerten, H K; Grote, J J

    1986-01-01

    This study was performed to design a method for the culture of rat middle-ear epithelium and to apply the method to investigate the characteristics of this epithelium. Culture of explants of middle-ear epithelium in the presence of the epidermal growth factor was successful, whereas serial cultivation required 3T3 feeder cells in addition to the epidermal growth factor. Cultured middle-ear epithelium was studied by phase-contrast microscopy, transmission and scanning electron microscopy, and combined light and scanning electron microscopy (LM/SEM). These techniques showed similarity between the cultured and the natural middle-ear epithelium. Explants and outgrowths showed both flat polygonal and ciliated epithelial cells. In serial cultivation, however, only the first of these cell types was observed. Frequently, a single primary cilium was found on the cell surface. Transmission electron microscopy showed cross-linked envelopes whose formation was promoted by ionophore X537A. Cytokeratin was demonstrated by immunoblotting, immunofluorescence, and immunoperoxidase methods, using an anti-cytokeratin monoclonal antibody. The model described here permits study of the differentiation of middle-ear epithelium in vitro and may be of future value for the study of chronic middle-ear diseases.

  8. Epithelial differentiation in developing murine eustachian tube and middle ear.

    Science.gov (United States)

    Park, K; Lee, Y D; Park, H J; Chun, Y M

    2000-06-01

    Detailed information on how an epithelial differentiation occurred in the developing eustachian tube and middle ear would be helpful in understanding both normal physiology and pathology of the tubotympanum. This study was undertaken to establish patterns of laminin and E-cadherin in the embryonic mouse eustachian tube and middle ear by use of immunohistochemistry at a stage when epithelial differentiation is taking place. This study was also designed to clarify the role of the middle ear mesenchyme. During the development of the eustachian tube, relatively high immunoreactivity to laminin was observed in the epithelium at gestational days 16 and 17, when the developments of ciliated and secretory cells were first observed. At the time of birth, in contrast to epithelium of the eustachian tube, epithelium of the middle ear cavity showed predominant expression of laminin and E-cadherin. These findings suggest that the expressions of laminin and E-cadherin may be correlated with maturation of the epithelium in the eustachian tube and middle ear and that the epithelial differentiation of the developing murine eustachian tube and middle ear may be controlled by epithelial-mesenchymal interaction and cell-to-cell interaction.

  9. The ear in fetal MRI: what can we really see?

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Nuno Canto [Neuroradiology Section C., Campos Costa, Fragosela, Viseu (Portugal); Uppsala University, Department of Radiology, Uppsala (Sweden); Teixeira, Joao [Department of Neuroradiology, Porto (Portugal); Raininko, Raili; Wikstrom, Johan [Uppsala University, Department of Radiology, Uppsala (Sweden)

    2011-12-15

    The aim of this study was to investigate the ability to depict the components of the ear on brain-oriented fetal MRI studies. Retrospective evaluation of the ear in MRI studies was performed post-mortem in 16 fetuses ranging from 15 to 22 gestation weeks (GW), and in 122 examinations in vivo of fetuses ranging from 20 to 38 GW. The cochlea, vestibular apparatus, middle ear, and external auditory canal were separately graded according to the components that were delineated. The components of the inner and middle ear were fully delineated in 100% of the post-mortem examinations, but the external auditory canals were only seen in only 25%. In the in vivo group, the imaging detail was much lower. Cochlear turns could be identified in 75% of the fetuses, the vestibule and the lateral semicircular canals in 72% andossicles in 70%. Before 25 GW, the ability to identify these individual parts was 50%, 30%, and 33%, respectively, and above it was 89%, 93%, and 90%. In most cases, the external auditory canals could only be seen after 29 GW. In fetal MRI studies in vivo, it is possible to depict the components of the ear in the majority of the fetuses, in such a manner as to exclude major malformations. However, MRI might not provide enough detail to rule out pathology of the ear before 25 GW, this being a critical age for pregnancy management in many countries. (orig.)

  10. Lumped parametric model of the human ear for sound transmission.

    Science.gov (United States)

    Feng, Bin; Gan, Rong Z

    2004-09-01

    A lumped parametric model of the human auditoria peripherals consisting of six masses suspended with six springs and ten dashpots was proposed. This model will provide the quantitative basis for the construction of a physical model of the human middle ear. The lumped model parameters were first identified using published anatomical data, and then determined through a parameter optimization process. The transfer function of the middle ear obtained from human temporal bone experiments with laser Doppler interferometers was used for creating the target function during the optimization process. It was found that, among 14 spring and dashpot parameters, there were five parameters which had pronounced effects on the dynamic behaviors of the model. The detailed discussion on the sensitivity of those parameters was provided with appropriate applications for sound transmission in the ear. We expect that the methods for characterizing the lumped model of the human ear and the model parameters will be useful for theoretical modeling of the ear function and construction of the ear physical model.

  11. Cognitive function in families with exceptional survival

    DEFF Research Database (Denmark)

    Barral, Sandra; Cosentino, Stephanie; Costa, Rosann

    2012-01-01

    members in the offspring generation demonstrate significantly better performance on multiple tasks requiring attention, working memory, and semantic processing when compared with individuals without a family history of exceptional survival, suggesting that cognitive performance may serve as an important...

  12. 48 CFR 8.605 - Exceptions.

    Science.gov (United States)

    2010-10-01

    ... REQUIRED SOURCES OF SUPPLIES AND SERVICES Acquisition From Federal Prison Industries, Inc. 8.605 Exceptions... determination that the FPI item of supply is not comparable to supplies available from the private sector that...

  13. 7 CFR 1944.75 - Exception authority.

    Science.gov (United States)

    2010-01-01

    ...) PROGRAM REGULATIONS (CONTINUED) HOUSING Housing Application Packaging Grants § 1944.75 Exception authority... supported with documentation to explain the adverse effect on the Government's interest and/or impact on the...

  14. Real ear unaided gain and its relation with the equivalent volume of the external and middle ear.

    Science.gov (United States)

    Bastos, Bárbara Guimarães; Ferrari, Deborah Viviane; Blasc, Wanderléia Quinhoneiro

    2012-07-01

     Old age is associated with changes in the characteristics of the middle ear transmission system and in external ear resonance, and these carry implications for the hearing aid (HA) verification process for which targets and measures of the real ear insertion gain (REIG) are used.  To compare the real ear unaided gain (REUG) and the equivalent volumes of the external ear (VeqEE) and the middle ear (VeqME) between elderly and adult patients.  This is a retrospective study in which the medical records of 28 elderly patients (aged between 61 and 102 years, average hearing thresholds between 38.75 and 85 dB HL) and 23 adult patients (aged 20-59, mean hearing thresholds between 31.25 and 116.25 dB HL) with bilateral sensorineural hearing loss and no history of middle ear abnormalities were analyzed. Immittance measurements (VeqEE, VeqME, and pressure of the peak of maximum compliance) and the REUG (frequency and amplitude of the primary peak) were recovered for a total of 40 ears. These data were compared between elderly and adults as well as between men and women, using Student's t test. Correlations (Pearson) between immittance and REUG data were also verified.  No statistically significant differences (p < 0.01) were found for immittance and REUG data between elderly and adults, or between men and women. A negative and weak but significant correlation was observed between the REUG primary peak and VeqEE.  Hearing aid verification can be performed with target and measures of the REIG in the elderly population.

  15. Real ear unaided gain and its relation with the equivalent volume of the external and middle ear

    Directory of Open Access Journals (Sweden)

    Bastos, Bárbara Guimarães

    2012-01-01

    Full Text Available Introduction: Old age is associated with changes in the characteristics of the middle ear transmission system and in external ear resonance, and these carry implications for the hearing aid (HA verification process for which targets and measures of the real ear insertion gain (REIG are used. Aim: To compare the real ear unaided gain (REUG and the equivalent volumes of the external ear (VeqEE and the middle ear (VeqME between elderly and adult patients. Methods: This is a retrospective study in which the medical records of 28 elderly patients (aged between 61 and 102 years, average hearing thresholds between 38.75 and 85 dB HL and 23 adult patients (aged 20-59, mean hearing thresholds between 31.25 and 116.25 dB HL with bilateral sensorineural hearing loss and no history of middle ear abnormalities were analyzed. Immittance measurements (VeqEE, VeqME, and pressure of the peak of maximum compliance and the REUG (frequency and amplitude of the primary peak were recovered for a total of 40 ears. These data were compared between elderly and adults as well as between men and women, using Student's t test. Correlations (Pearson between immittance and REUG data were also verified. Results: No statistically significant differences (p < 0.01 were found for immittance and REUG data between elderly and adults, or between men and women. A negative and weak but significant correlation was observed between the REUG primary peak and VeqEE. Conclusion: Hearing aid verification can be performed with target and measures of the REIG in the elderly population.

  16. Exceptional cosmetic surgeries on homology spheres

    OpenAIRE

    Ravelomanana, Huygens C.

    2016-01-01

    The cosmetic surgery conjecture is a longstanding conjecture in 3-manifold theory. We present a theorem about exceptional cosmetic surgery for homology spheres. Along the way we prove that if the surgery is not a small seifert $\\mathbb{Z}/2\\mathbb{Z}$-homology sphere or a toroidal irreducible non-Seifert surgery then there is at most one pair of exceptional truly cosmetic slope. We also prove that toroidal truly cosmetic surgeries on integer homology spheres must be integer homology spheres.

  17. Differential regulation of Hes/Hey genes during inner ear development.

    Science.gov (United States)

    Petrovic, Jelena; Gálvez, Hector; Neves, Joana; Abelló, Gina; Giraldez, Fernando

    2015-07-01

    Notch signaling plays a crucial role during inner ear development and regeneration. Hes/Hey genes encode for bHLH transcription factors identified as Notch targets. We have studied the expression and regulation of Hes/Hey genes during inner ear development in the chicken embryo. Among several Hes/Hey genes examined, only Hey1 and Hes5 map to the sensory regions, although with salient differences. Hey1 expression follows Jag1 expression except at early prosensory stages while Hes5 expression corresponds well to Dl1 expression throughout otic development. Although Hey1 and Hes5 are direct Notch downstream targets, they differ in the level of Notch required for activation. Moreover, they also differ in mRNA stability, showing different temporal decays after Notch blockade. In addition, Bmp, Wnt and Fgf pathways also modify Hey1 and Hes5 expression in the inner ear. Particularly, the Wnt pathway modulates Hey1 and Jag1 expression. Finally, gain of function experiments show that Hey1 and Hes5 cross-regulate each other in a complex manner. Both Hey1 and Hes5 repress Dl1 and Hes5 expression, suggesting that they prevent the transition to differentiation stages, probably by preventing Atoh1 expression. In spite of its association with Jag1, Hey1 does not seem to be instrumental for lateral induction as it does not promote Jag1 expression. We suggest that, besides being both targets of Notch, Hey1 and Hes5 are subject to a rather complex regulation that includes the stability of their transcripts, cross regulation and other signaling pathways. © 2014 Wiley Periodicals, Inc.

  18. The role of phytophysiognomies and seasonality on the structure of ground-dwelling anuran (Amphibia) in the Pampa biome, Southern Brazil.

    Science.gov (United States)

    Maragno, Franciéle P; Santos, Tiago G; Cechin, Sonia Z

    2013-09-01

    Considering that habitat use by amphibians is related both with climate and environmental features, we tested the hypothesis that anuran assemblages found in different phytophysiognomies and in different seasons vary in structure. Additionally, we searched for species which can be indicators of habitat and seasons. The study was conducted in the Pampa biome, southern Brazil. Sampling was done through pitfall traps placed in three phytophysiognomies: grassland, ecotone grassland/forest; and forest. The seasonality factor was created by grouping months in warn and cold seasons. Sixteen species were found and the assemblages were influenced both by phytophysiognomies and climatic seasonality. In a paired comparison, the three phytophysiognomies differed in structure of assemblage from each other. Physalaemus henselii, P. riograndensis, Pseudopaludicola falcipes and Pseudis minuta were indicators of ecotone. Leptodactylus gracilis and Physalaemus biligonigerus were indicators of grassland. None species was indicator of forest. Most of the species were indicators of warm season: Elachistocleis bicolor, Leptodactylus fuscus, L. gracilis, L. latinasus, L. latrans, L. mystacinus, Physalaemus biligonigerus, P. cuvieri and Pseudis minuta. None species was indicator of cold season. We found that even for species of open areas, as Pampa, heterogeneous phytophysiognomies are important for maintaining abundance and constancy of populations of anuran.

  19. Origin of inner ear hair cells: morphological and functional differentiation from ciliary cells into hair cells in zebrafish inner ear.

    Science.gov (United States)

    Tanimoto, Masashi; Ota, Yukiko; Inoue, Maya; Oda, Yoichi

    2011-03-09

    Auditory and vestibular functions in vertebrates depend on the transduction of sound vibration or head acceleration into electrical responses in inner ear hair cells. Mechanoelectrical transduction occurs at the tip of stereocilia, which are polarized to form an orientational arrangement that determines directional sensitivity. It remains to be clarified when and how premature hair cells acquire their specialized structure and function in living animals. The developmental origin of inner ear hair cells has been studied in vivo in zebrafish embryos. Tether cells, a small number of ciliated cells associated with an "ear stone" (or otolith) in the embryonic zebrafish inner ear, are believed to be precocious hair cells. However, whether or not tether cells acquire hair bundles and mechanosensitivity remains unknown. In the present study, we investigated the morphological and functional development of tether cells. Immunohistochemical examination revealed that stereocilia appeared on the tether cell apex in a polarized arrangement at 22 h postfertilization (hpf). Labeling with FM1-43, a marker of functional mechanotransduction channels, and the in vivo electrophysiological recording of mechanotransducer responses in the developing inner ear demonstrated that tether cells acquired direction-selective mechanosensitivity at 23 hpf. These results revealed that tether cells begin to function as hair cells within an hour after the appearance of a polarized array of stereociliary bundles. Thus, the ciliary cells morphologically and functionally differentiate into the first sensory hair cells in the inner ear of the zebrafish.

  20. Morphological variation among the inner ears of extinct and extant baleen whales (Cetacea: Mysticeti).

    Science.gov (United States)

    Ekdale, Eric G

    2016-12-01

    Living mysticetes (baleen whales) and odontocetes (toothed whales) differ significantly in auditory function in that toothed whales are sensitive to high-frequency and ultrasonic sound vibrations and mysticetes to low-frequency and infrasonic noises. Our knowledge of the evolution and phylogeny of cetaceans, and mysticetes in particular, is at a point at which we can explore morphological and physiological changes within the baleen whale inner ear. Traditional comparative anatomy and landmark-based 3D-geometric morphometric analyses were performed to investigate the anatomical diversity of the inner ears of extinct and extant mysticetes in comparison with other cetaceans. Principal component analyses (PCAs) show that the cochlear morphospace of odontocetes is tangential to that of mysticetes, but odontocetes are completely separated from mysticetes when semicircular canal landmarks are combined with the cochlear data. The cochlea of the archaeocete Zygorhiza kochii and early diverging extinct mysticetes plot within the morphospace of crown mysticetes, suggesting that mysticetes possess ancestral cochlear morphology and physiology. The PCA results indicate variation among mysticete species, although no major patterns are recovered to suggest separate hearing or locomotor regimes. Phylogenetic signal was detected for several clades, including crown Cetacea and crown Mysticeti, with the most clades expressing phylogenetic signal in the semicircular canal dataset. Brownian motion could not be excluded as an explanation for the signal, except for analyses combining cochlea and semicircular canal datasets for Balaenopteridae. J. Morphol. 277:1599-1615, 2016. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  1. Genetic structure, spatial organization, and dispersal in two populations of bat-eared foxes.

    Science.gov (United States)

    Kamler, Jan F; Gray, Melissa M; Oh, Annie; Macdonald, David W

    2013-09-01

    We incorporated radio-telemetry data with genetic analysis of bat-eared foxes (Otocyon megalotis) from individuals in 32 different groups to examine relatedness and spatial organization in two populations in South Africa that differed in density, home-range sizes, and group sizes. Kin clustering occurred only for female dyads in the high-density population. Relatedness was negatively correlated with distance only for female dyads in the high-density population, and for male and mixed-sex dyads in the low-density population. Home-range overlap of neighboring female dyads was significantly greater in the high compared to low-density population, whereas overlap within other dyads was similar between populations. Amount of home-range overlap between neighbors was positively correlated with genetic relatedness for all dyad-site combinations, except for female and male dyads in the low-density population. Foxes from all age and sex classes dispersed, although females (mostly adults) dispersed farther than males. Yearlings dispersed later in the high-density population, and overall exhibited a male-biased dispersal pattern. Our results indicated that genetic structure within populations of bat-eared foxes was sex-biased, and was interrelated to density and group sizes, as well as sex-biases in philopatry and dispersal distances. We conclude that a combination of male-biased dispersal rates, adult dispersals, and sex-biased dispersal distances likely helped to facilitate inbreeding avoidance in this evolutionarily unique species of Canidae.

  2. Otoacoustic emissions from insect ears: evidence of active hearing?

    Science.gov (United States)

    Kössl, Manfred; Möckel, Doreen; Weber, Melanie; Seyfarth, Ernst-August

    2008-07-01

    Sensitive hearing organs often employ nonlinear mechanical sound processing which generates distortion-product otoacoustic emissions (DPOAE). Such emissions are also recordable from tympanal organs of insects. In vertebrates (including humans), otoacoustic emissions are considered by-products of active sound amplification through specialized sensory receptor cells in the inner ear. Force generated by these cells primarily augments the displacement amplitude of the basilar membrane and thus increases auditory sensitivity. As in vertebrates, the emissions from insect ears are based on nonlinear mechanical properties of the sense organ. Apparently, to achieve maximum sensitivity, convergent evolutionary principles have been realized in the micromechanics of these hearing organs-although vertebrates and insects possess quite different types of receptor cells in their ears. Just as in vertebrates, otoacoustic emissions from insects ears are vulnerable and depend on an intact metabolism, but so far in tympanal organs, it is not clear if auditory nonlinearity is achieved by active motility of the sensory neurons or if passive cellular characteristics cause the nonlinear behavior. In the antennal ears of flies and mosquitoes, however, active vibrations of the flagellum have been demonstrated. Our review concentrates on experiments studying the tympanal organs of grasshoppers and moths; we show that their otoacoustic emissions are produced in a frequency-specific way and can be modified by electrical stimulation of the sensory cells. Even the simple ears of notodontid moths produce distinct emissions, although they have just one auditory neuron. At present it is still uncertain, both in vertebrates and in insects, if the nonlinear amplification so essential for sensitive sound processing is primarily due to motility of the somata of specialized sensory cells or to active movement of their (stereo-)cilia. We anticipate that further experiments with the relatively simple ears

  3. Stimulus-dependent effects on right ear advantage in schizophrenia

    Directory of Open Access Journals (Sweden)

    Smucny J

    2012-09-01

    Full Text Available Jason Smucny,1,3 Korey Wylie,3 Jason Tregellas1–31Neuroscience Program, University of Colorado Anschutz Medical Campus, 2Research Science, Denver VA Medical, Center, 3Department of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USABackground: When presented with different sounds in each ear (dichotic listening, healthy subjects typically show a preference for stimuli heard in the right ear, an effect termed "right ear advantage". Previous studies examining right ear advantage in schizophrenia have been inconsistent, showing either decreased or increased advantage relative to comparison subjects. Given evidence for enhanced semantic processing in schizophrenia, some of this inconsistency may be due to the type of stimuli presented (words or syllables. The present study examined right ear advantage in patients and controls using both words and syllables as stimuli.Methods: Right ear advantage was compared between 20 patients with schizophrenia and 17 healthy controls. Two versions of the task were used, ie, a consonant-vowel pairing task and a fused rhymed words task.Results: A significant group × task interaction was observed. Relative to healthy controls, patients showed a greater difference on the syllable-based task compared with the word-based task. The number of distractors marked during the syllable-based task was inversely correlated with score on the Global Assessment of Function Scale.Conclusion: The findings are consistent with a left hemisphere dysfunction in schizophrenia, but also suggest that differences may be stimulus-specific, with a relative sparing of the deficit in the context of word stimuli. Performance may be related to measures of social, occupational, and psychological function.Keywords: schizophrenia, right ear advantage, dichotic, distraction

  4. Automatic sleep stage classification using ear-EEG.

    Science.gov (United States)

    Stochholm, Andreas; Mikkelsen, Kaare; Kidmose, Preben

    2016-08-01

    Sleep assessment is of great importance in the diagnosis and treatment of sleep disorders. In clinical practice this is typically performed based on polysomnography recordings and manual sleep staging by experts. This procedure has the disadvantages that the measurements are cumbersome, may have a negative influence on the sleep, and the clinical assessment is labor intensive. Addressing the latter, there has recently been encouraging progress in the field of automatic sleep staging [1]. Furthermore, a minimally obtrusive method for recording EEG from electrodes in the ear (ear-EEG) has recently been proposed [2]. The objective of this study was to investigate the feasibility of automatic sleep stage classification based on ear-EEG. This paper presents a preliminary study based on recordings from a total of 18 subjects. Sleep scoring was performed by a clinical expert based on frontal, central and occipital region EEG, as well as EOG and EMG. 5 subjects were excluded from the study because of alpha wave contamination. In one subject the standard polysomnography was supplemented by ear-EEG. A single EEG channel sleep stage classifier was implemented using the same features and the same classifier as proposed in [1]. The performance of the single channel sleep classifier based on the scalp recordings showed an 85.7 % agreement with the manual expert scoring through 10-fold inter-subject cross validation, while the performance of the ear-EEG recordings was based on a 10-fold intra-subject cross validation and showed an 82 % agreement with the manual scoring. These results suggest that automatic sleep stage classification based on ear-EEG recordings may provide similar performance as compared to single channel scalp EEG sleep stage classification. Thereby ear-EEG may be a feasible technology for future minimal intrusive sleep stage classification.

  5. Tail Docking and Ear Cropping Dogs: Public Awareness and Perceptions.

    Science.gov (United States)

    Mills, Katelyn E; Robbins, Jesse; von Keyserlingk, Marina A G

    2016-01-01

    Tail docking and ear cropping are two surgical procedures commonly performed on many dog breeds. These procedures are classified as medically unnecessary surgeries whose purpose is primarily cosmetic. Available attitude research surrounding these controversial practices has been limited to surveys of veterinarians and dog breeders familiar with both practices. The aim of this project was to: 1) assess public awareness of tail docking and ear cropping, 2) determine whether physical alteration of a dog affects how the dog, and 3) owner are perceived. In Experiment 1 awareness was measured using a combination of both explicit and implicit measures. We found that 42% of participants (n = 810) were unable to correctly explain the reason why tail docked and ear cropped dogs had short ears and tails. Similarly, an implicit measure of awareness ('nature vs nurture task'), found that the majority of participants believed short tails and erect ears were a consequence of genetics rather than something the owner or breeder had done. The results obtained in Experiment 2 (n = 392) provide evidence that ear cropped and tail docked dogs are perceived differently than an identical dog in its 'natural' state. Modified dogs were perceived as being more aggressive, more dominant, less playful and less attractive than natural dogs. Experiment 3 (n = 410) is the first evidence that owners of modified dogs are perceived as being more aggressive, more narcissistic, less playful, less talkative and less warm compared to owners of natural dogs. Taken together, these results suggest that although a significant proportion of subjects appear unaware of the practices of tail docking and ear cropping in dogs, these procedures have significant impacts on how modified dogs and their owners are perceived by others.

  6. Tail Docking and Ear Cropping Dogs: Public Awareness and Perceptions.

    Directory of Open Access Journals (Sweden)

    Katelyn E Mills

    Full Text Available Tail docking and ear cropping are two surgical procedures commonly performed on many dog breeds. These procedures are classified as medically unnecessary surgeries whose purpose is primarily cosmetic. Available attitude research surrounding these controversial practices has been limited to surveys of veterinarians and dog breeders familiar with both practices. The aim of this project was to: 1 assess public awareness of tail docking and ear cropping, 2 determine whether physical alteration of a dog affects how the dog, and 3 owner are perceived. In Experiment 1 awareness was measured using a combination of both explicit and implicit measures. We found that 42% of participants (n = 810 were unable to correctly explain the reason why tail docked and ear cropped dogs had short ears and tails. Similarly, an implicit measure of awareness ('nature vs nurture task', found that the majority of participants believed short tails and erect ears were a consequence of genetics rather than something the owner or breeder had done. The results obtained in Experiment 2 (n = 392 provide evidence that ear cropped and tail docked dogs are perceived differently than an identical dog in its 'natural' state. Modified dogs were perceived as being more aggressive, more dominant, less playful and less attractive than natural dogs. Experiment 3 (n = 410 is the first evidence that owners of modified dogs are perceived as being more aggressive, more narcissistic, less playful, less talkative and less warm compared to owners of natural dogs. Taken together, these results suggest that although a significant proportion of subjects appear unaware of the practices of tail docking and ear cropping in dogs, these procedures have significant impacts on how modified dogs and their owners are perceived by others.

  7. Tympanoplasty without use of gelfoam in the middle ear

    Directory of Open Access Journals (Sweden)

    Samad Ghiasi

    2008-07-01

    Full Text Available Introduction:  In usual technique of tympanoplasty almost all of otologic surgeons use gelfoam in the middle ear for support of graft against margin of tympanic membrane perforation. In this study we use technique that we did not use gelfoam in the middle ear. We compared results of graft taking rate in two techniques. Materials and Methods: In a clinical trial study during 2 years 181 patients with COM underwent tympanoplasty with underlay grafting. In 83 patients used gelfoam in the middle ear for tympanoplasty or tympanomastoidectomy (CCTM, OCTM. In 98 patients we did not use gelfoam in the middle ear. Results: In 83 patients with use of gelfoam, graft taking rate in 59 (71.1% cases with tympanoplasty and CCTM was 54 (91% and in 24 (28.9% cases with OCTM was 20 (83%. In 98 patients without use of gelfoam, graft taking rate in 61 (62.2% cases with tympanoplasty and CCTM was 54 (89% and in 37 (37.8% cases with OCTM were 31 (84%. Conclusion: In this study, results of graft taking rate were similar in 2 groups. On the other hand, gelfoam entirely reabsorbed during 45 to 54 days in the middle ear and immune system react by a round cell response. This sponge encourages the formation of the fibrous tissue at a higher rate than naturally occurs in the ear. In our technique we had not these problems. Another advantage of this technique is rapid improvement of patient hearing after removing of the external ear canal rosebud. We think this technique could be used in tympanoplasty and tympanomastoidectoy routinely. ‍‍‍

  8. Statistical tests to compare motif count exceptionalities

    Directory of Open Access Journals (Sweden)

    Vandewalle Vincent

    2007-03-01

    Full Text Available Abstract Background Finding over- or under-represented motifs in biological sequences is now a common task in genomics. Thanks to p-value calculation for motif counts, exceptional motifs are identified and represent candidate functional motifs. The present work addresses the related question of comparing the exceptionality of one motif in two different sequences. Just comparing the motif count p-values in each sequence is indeed not sufficient to decide if this motif is significantly more exceptional in one sequence compared to the other one. A statistical test is required. Results We develop and analyze two statistical tests, an exact binomial one and an asymptotic likelihood ratio test, to decide whether the exceptionality of a given motif is equivalent or significantly different in two sequences of interest. For that purpose, motif occurrences are modeled by Poisson processes, with a special care for overlapping motifs. Both tests can take the sequence compositions into account. As an illustration, we compare the octamer exceptionalities in the Escherichia coli K-12 backbone versus variable strain-specific loops. Conclusion The exact binomial test is particularly adapted for small counts. For large counts, we advise to use the likelihood ratio test which is asymptotic but strongly correlated with the exact binomial test and very simple to use.

  9. Preliminary observations on isotretinoin-induced ear malformations and pattern formation of the external ear.

    Science.gov (United States)

    Lammer, E

    1991-01-01

    Retinoic acid is a morphogenic substance capable of inducing a variety of limb malformations, including duplications and reduction-type defects. Whether retinoic acid plays a similar role in controlling pattern formation of other vertebrate structures is unclear. Many fetuses and infants exposed to isotretinoin (13-cis-retinoic acid) in utero have a characteristic pattern of anomalies, chiefly involving brain, craniofacial, and thymic morphogenesis. Among the craniofacial anomalies, external ear malformations are common and the specific types of auricular malformations include partial duplications, and tissue reductions and displacements. These similarities to the types of limb malformations that retinoic acid can induce suggest that retinoic acid may play an important role in controlling pattern formation of facial structures.

  10. Human ear detection in the thermal infrared spectrum

    Science.gov (United States)

    Abaza, Ayman; Bourlai, Thirimachos

    2012-06-01

    In this paper the problem of human ear detection in the thermal infrared (IR) spectrum is studied in order to illustrate the advantages and limitations of the most important steps of ear-based biometrics that can operate in day and night time environments. The main contributions of this work are two-fold: First, a dual-band database is assembled that consists of visible and thermal profile face images. The thermal data was collected using a high definition middle-wave infrared (3-5 microns) camera that is capable of acquiring thermal imprints of human skin. Second, a fully automated, thermal imaging based ear detection method is developed for real-time segmentation of human ears in either day or night time environments. The proposed method is based on Haar features forming a cascaded AdaBoost classifier (our modified version of the original Viola-Jones approach1 that was designed to be applied mainly in visible band images). The main advantage of the proposed method, applied on our profile face image data set collected in the thermal-band, is that it is designed to reduce the learning time required by the original Viola-Jones method from several weeks to several hours. Unlike other approaches reported in the literature, which have been tested but not designed to operate in the thermal band, our method yields a high detection accuracy that reaches ~ 91.5%. Further analysis on our data set yielded that: (a) photometric normalization techniques do not directly improve ear detection performance. However, when using a certain photometric normalization technique (CLAHE) on falsely detected images, the detection rate improved by ~ 4%; (b) the high detection accuracy of our method did not degrade when we lowered down the original spatial resolution of thermal ear images. For example, even after using one third of the original spatial resolution (i.e. ~ 20% of the original computational time) of the thermal profile face images, the high ear detection accuracy of our method

  11. Within-ear and across-ear interference in a dichotic cocktail party listening task: Effects of masker uncertainty

    Science.gov (United States)

    Brungart, Douglas S.; Simpson, Brian D.

    2004-01-01

    Increases in masker variability have been shown to increase the effects of informational masking in non-speech listening tasks, but relatively little is known about the influence that masker uncertainty has on the informational components of speech-on-speech masking. In this experiment, listeners were asked to extract information from a target phrase that was presented in their right ear while ignoring masking phrases that were presented in the same ear as the target phrase and in the ear opposite the target phrase. The level of masker uncertainty was varied by holding constant or ``freezing'' the talkers speaking the masking phrases, the semantic content used in the masking phrases, or both the talkers and the semantic content in the masking phrases within each block of 120 trials. The results showed that freezing the semantic content of the masking phrase in the target ear was the only reduction in masker uncertainty that ever resulted in a significant improvement in performance. Providing feedback after each trial improved performance overall, but did not prevent the listeners from making incorrect responses that matched the content of the frozen target-ear masking phrase. However, removing the target-ear contents corresponding to the masking phrase from the response set resulted in a dramatic improvement in performance. This suggests that the listeners were generally able to understand both of the phrases presented to the target ear, and that their incorrect responses in the task were almost entirely a result of their inability to determine which words were spoken by the target talker.

  12. [Is the middle ear the first filter of frequency selectivity?].

    Science.gov (United States)

    Vallejo, Luis Angel; Hidalgo, Antonio; Lobo, Fernando; Tesorero, María Antonia; Gil-Carcedo, Elisa; Sánchez, Elena; Gil-Carcedo, Luis M

    2010-01-01

    The cochlea has traditionally been considered as the first frequency selection filter in the auditory pathway due to the contraction of its external ciliated cells. Yet, much evidence has emerged from work carried out during experiments with animals, some of which is anatomical (connections between the auditory pathway and motor nuclei of the middle ear muscles) and other physiological, which indicates that the middle ear might be the first filter through which specific sounds from noisy environments may initially be isolated. In cooperation with the Department of Mechanical Engineering of the Technical School of Industrial Engineering at the University of Valladolid (UVa) we have developed and refined a new admittance meter capable of evaluating changes in impedance that occur in the human middle ear depending on frequency. Using this device we have measured variation in impedance in 7 otologically healthy volunteers submitted to a varied range of sound environments. We have found that hearing impedance is not constant but rather that the attention offered by the examined subjects when following a conversation in a noisy environment leads to variations in hearing impedance at high frequencies. In the light of these findings we feel that the middle ear does not play a merely passive role in hearing but rather that the contraction of the endotympanic muscles makes possible variations in impedance such that the resonance frequency of the ear shifts towards higher frequencies, thus enhancing sound discrimination in noisy environments. Copyright 2009 Elsevier España, S.L. All rights reserved.

  13. Post-exceptionalism in public policy

    DEFF Research Database (Denmark)

    Daugbjerg, Carsten; Feindt, Peter H.

    2017-01-01

    Framing the special issue on the transformation of Food and Agricultural Policy, this article introduces the concept of post-exceptionalism in public policies. The analysis of change in agri-food policy serves as a generative example to conceptualize current transformations in sectoral policy......, institutions, interest constellations and policy instruments. It reflects the more complex, open, contested and fluid nature of contemporary policy fields that nevertheless still maintain their policy heritage. Discussing stability, the authors distinguish between complementary and tense post-exceptionalism....

  14. Session-based Choreography with Exceptions

    DEFF Research Database (Denmark)

    Carbone, Marco

    2009-01-01

    Choreography has recently emerged as a pragmatic and concise way of describing communication-based systems such as web services and financial protocols. Recent studies have investigated the transition from the design stage of a system to its implementation providing an automatic way of mapping...... a choreograhy into executable code. In this work, we focus on an extension of choreography with a communication-based (interactional) exception mechanism by giving its formal semantics. In particular, we discuss through some examples how interactional exceptions at choreography level can be implemented into end...

  15. Comparison of Gastrografin to barium sulfate as a gastrointestinal contrast agent in red-eared slider turtles (Trachemys scripta elegans).

    Science.gov (United States)

    Long, Charles Tyler; Page, Richard B; Howard, Antwain M; McKeon, Gabriel P; Felt, Stephen A

    2010-01-01

    Red-eared slider turtles (Trachemys scripta elegans) commonly develop intestinal obstruction. The gastrointestinal transit time in turtles tends to be longer than in other animals, making a rapid diagnosis of obstruction difficult. Fifteen red-eared sliders were given either Gastrografin or 30% w/v barium sulfate orally to compare ease of administration, transit time, and image quality. Each contrast medium was easy to administer but barium sulfate had to be administered more slowly (mean = 40s) than Gastrografin (mean = 20s) to prevent regurgitation. The mean transit and emptying time of Gastrografin was at least 9 h faster than barium sulfate at all time points except gastric transit. Both contrast media had a smooth, uniform appearance that outlined the mucosa with well-defined margins within the stomach and proximal small intestine. Dilution of Gastrografin occurred as it progressed through the intestines, resulting in decreased opacity in the distal small intestine and colon. Pre-administration packed cell volume and total serum protein levels of four turtles receiving Gastrografin were compared with levels at 24-, 96-, and 168-hours postadministration as well as to four control turtles not receiving contrast medium. Packed cell volume and total serum protein levels did not significantly differ among the Gastrografin and control group. From a clinical perspective, administration of Gastrografin allows for quicker results with only minor hematologic changes in red-eared sliders, but visualization of this contrast medium in the lower gastrointestinal tract may be insufficient for an accurate diagnosis.

  16. Spatiotemporal patterns of Musashi1 expression during inner ear development.

    Science.gov (United States)

    Sakaguchi, Hirofumi; Yaoi, Takeshi; Suzuki, Toshihiro; Okano, Hideyuki; Hisa, Yasuo; Fushiki, Shinji

    2004-04-29

    Musashi1 (Msi 1) is an RNA binding protein associated with asymmetric cell divisions in neural progenitor cells. To investigate the involvement of Msi1 in the inner ear development, we studied the expression of Msi1 in mouse inner ears with RT-PCR and immunohistochemistry. Immunohistochemistry revealed that Msi1 was expressed in all otocyst cells at embryonic day (E) 10 and 12. Msi1 immunoreactivity became lost in hair cells after E14 in vestibule and after E16 in cochlea, whereas it persisted in supporting cells until adulthood. The subcellular localization of Msi1 changed from "cytoplasmic predominance" to "nuclear predominance" during the first 2 weeks after birth. The present data suggested that Msi may play a role in inner ear development.

  17. Differential diagnosis of middle ear inflammatory diseases by MRI findings

    Energy Technology Data Exchange (ETDEWEB)

    Muneta, Yuki; Yamamoto, Etsuo; Ohmura, Masaki; Mizukami, Chikashi; Oiki, Hiroyuki; Tsuji, Jun; Tanabe, Makito; Funabiki, Kazuo; Saiwai, Shigeo (Kobe City General Hospital (Japan))

    1992-09-01

    Although computed tomography can reveal a soft tissue mass in middle ear diseases as an area of increased density, it cannot differentiate cholesteatoma from other inflammatory tissue. We prospectively studied 30 patients with various middle ear inflammatory diseases, including inflammatory granulation tissue, cholesteatoma and cholesterin granuloma with magnetic resonance imaging (MRI) with or without Gd-DTPA enhancement. Cholesteatoma and inflammatory granulation tissue showed intensity ranging from low to high on T1-weighted images and from high to very high on T2-weighted images. However, cholesteatoma showed either no enhancement or ring enhancement on MR imagings with Gd-DTPA, and it could be differentiated from the Gd-DTPA-enhanced inflammatory granulation tissue. Cholesterin granuloma showed very high intensity on both T1 and T2-weighted images. Therefore, MRI with Gd-DTPA is considered to be useful in the differential diagnosis of these middle ear diseases. (auhtor).

  18. Human Action Recognition Using Wireless Wearable In-Ear Microphone

    Science.gov (United States)

    Nishimura, Jun; Kuroda, Tadahiro

    To realize the ubiquitous eating habits monitoring, we proposed the use of sounds sensed by an in-ear placed wireless wearable microphone. A prototype of wireless wearable in-ear microphone was developed by utilizing a common Bluetooth headset. We proposed a robust chewing action recognition algorithm which consists of two recognition stages: “chew-like” signal detection and chewing sound verification stages. We also provide empirical results on other action recognition using in-ear sound including swallowing, cough, belch, and etc. The average chewing number counting error rate of 1.93% is achieved. Lastly, chewing sound mapping is proposed as a new prototypical approach to provide an additional intuitive feedback on food groups to be able to infer the eating habits in their daily life context.

  19. Multimodal recognition based on face and ear using local feature

    Science.gov (United States)

    Yang, Ruyin; Mu, Zhichun; Chen, Long; Fan, Tingyu

    2017-06-01

    The pose issue which may cause loss of useful information has always been a bottleneck in face and ear recognition. To address this problem, we propose a multimodal recognition approach based on face and ear using local feature, which is robust to large facial pose variations in the unconstrained scene. Deep learning method is used for facial pose estimation, and the method of a well-trained Faster R-CNN is used to detect and segment the region of face and ear. Then we propose a weighted region-based recognition method to deal with the local feature. The proposed method has achieved state-of-the-art recognition performance especially when the images are affected by pose variations and random occlusion in unconstrained scene.

  20. [Scanning electron microscopic study on newborn middle ear mucosa].

    Science.gov (United States)

    Li, Y

    1992-01-01

    Scanning electron microscopic studies were made on the mucosa of newborn middle ear. The results were: 1. The epithelial surface was found to contain four types of cell: the ciliated cell, the nonciliated cell without secretory granules (SG), the nonciliated cell with secretory granules (SG) and the flat cell. 2. The ciliated cell population appeared in the following order (from dense to sparse): eustachian tube, hypotympanum, antetympanum, epitympanum, promontory and post-tympanum. 3. The density of nonciliated cell without SG population was gradually increasing from anterior to posterior part of middle ear. 4. The population of nonciliated cell with SG was fewer and they were always found near the ciliated cells. 5. The flat cells were only seen on the flaccid part of tympanic membrane. This paper suggests that the ciliary system is basically mature and the development of mucus secreting members still is not perfect in newborn middle ear mucosa.

  1. Aerodigestive and Ear Foreign Bodies at Lumbini Medical College

    Directory of Open Access Journals (Sweden)

    Anup Acharya

    2013-06-01

    methods using SPSS version 17.0.   Result: There were total of 74 cases of ENT foreign body. Male predominance was noted (61%. Foreign body of ear was found to be most frequent (43% followed by throat (37% and nose (20%. Foreign body of nose was almost limited in paediatrics population (14 out of 15 whereas in the elderly group foreign body of throat was only found. Seeds, meat bolus or bone or both, insects and cotton bud were the most common foreign bodies. There was significant relation between the type of foreign body and age (p <0.05 and the living foreign body and ear.   Conclusion: Foreign bodies of nose, ear and throat are common in ENT department. They should be timely managed to prevent potential complications.

  2. The middle ear immune defense changes with age

    DEFF Research Database (Denmark)

    Nielsen, Michelle Christine; Friis, Morten; Martin-Bertelsen, Tomas

    2016-01-01

    of this study was to analyze the relationship between age and the mucosal immune system in the middle ear. It is hypothesized that genes involved in the middle ear immune system will change with age. A comprehensive assessment of these genetic differences using the techniques of complementary DNA has not been......-chain T-cell receptor-associated protein kinase and linker of activated T-cells, were upregulated in the adult. This study concludes that the normal middle ear immune system changes with age. Genes related to the innate immune system are upregulated in young rats, whereas genes related to the adaptive......Otitis media is a common disease in childhood. In adults, the disease is relatively rare, but more frequently associated with complications. Possible reasons for this discrepancy are age-related differences in pathogen exposure, anatomy of the Eustachian tube and immune system. The objective...

  3. Validation of methods for prediction of clinical output levels of active middle ear implants from measurements in human cadaveric ears.

    Science.gov (United States)

    Grossöhmichen, Martin; Waldmann, Bernd; Salcher, Rolf; Prenzler, Nils; Lenarz, Thomas; Maier, Hannes

    2017-11-20

    Today, the standard method to predict output levels of active middle ear implants (AMEIs) before clinical data are available is stapes vibration measurement in human cadaveric ears, according to ASTM standard F2504-05. Although this procedure is well established, the validity of the predicted output levels has never been demonstrated clinically. Furthermore, this procedure requires a mobile and visually accessible stapes and an AMEI stimulating the ossicular chain. Thus, an alternative method is needed to quantify the output level of AMEIs in all other stimulation modes, e.g. reverse stimulation of the round window. Intracochlear pressure difference (ICPD) is a good candidate for such a method as it correlates with evoked potentials in animals and it is measurable in cadaveric ears. To validate this method we correlated AMEI output levels calculated from ICPD and from stapes vibration in cadaveric ears with outputs levels determined from clinical data. Output levels calculated from ICPD were similar to output levels calculated from stapes vibration and almost identical to clinical data. Our results demonstrate that both ICPD and stapes vibration can be used as a measure to predict AMEI clinical output levels in cadaveric ears and that ICPD as reference provided even more accurate results.

  4. Learning Disabilities - Programs: Exceptional Child Bibliography Series.

    Science.gov (United States)

    Council for Exceptional Children, Reston, VA. Information Center on Exceptional Children.

    One in a series of over 50 similar selected listings relating to handicapped and gifted children, the bibliography contains 96 references selected from Exceptional Child Education Abstracts concerning programing for children with learning disabilities. References include conference papers, journal articles, texts for parents and teachers, and…

  5. Post-exceptionalism in public policy

    NARCIS (Netherlands)

    Daugbjerg, Carsten; Feindt, Peter H.

    2017-01-01

    Framing the special issue on the transformation of Food and Agricultural Policy, this article introduces the concept of post-exceptionalism in public policies. The analysis of change in agri-food policy serves as a generative example to conceptualize current transformations in sectoral policy

  6. 7 CFR 774.24 - Exception.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 7 2010-01-01 2010-01-01 false Exception. 774.24 Section 774.24 Agriculture Regulations of the Department of Agriculture (Continued) FARM SERVICE AGENCY, DEPARTMENT OF AGRICULTURE... interest of the Government and not inconsistent with the authorizing statute or other applicable law. ...

  7. 7 CFR 773.23 - Exception.

    Science.gov (United States)

    2010-01-01

    ... 7 Agriculture 7 2010-01-01 2010-01-01 false Exception. 773.23 Section 773.23 Agriculture Regulations of the Department of Agriculture (Continued) FARM SERVICE AGENCY, DEPARTMENT OF AGRICULTURE... Government and not inconsistent with the authorizing statute or other applicable law. ...

  8. FAPE Model of Exceptional Student Education Leadership

    Science.gov (United States)

    Dubberly, Russell G.

    2012-01-01

    The FAPE Model of Exceptional Education Leadership is defined as facilitative, affiliative, praising and rewarding, and experiential and empirical. The FAPE administrator uses a facilitative approach that guides and coaches to help employees find a pathway to success. This leader works to build emotional capacity between all members of the…

  9. Leiomyosarcoma of the Penis, an Exceptional Entity

    Directory of Open Access Journals (Sweden)

    Edwin Javier Romero Gonzalez

    2015-05-01

    Full Text Available In tumors of the penis, mesenchymal tumors are extremely rare and within them, sarcomas are exceptional. We report a patient with a sarcomatous lesion treated with conservative surgery with good surgical outcome and the review of the literature, to present the latest advances in the treatment of this unusual entity.

  10. Seeing and Supporting Twice-Exceptional Learners

    Science.gov (United States)

    Lee, Chin-Wen; Ritchotte, Jennifer A.

    2018-01-01

    Through a four-part discussion, this essay advocates for seeing the characteristics and special needs of gifted students with disabilities and using best practices to support their learning. Part 1 delineates the evolution of the legislative acts and professional initiatives regarding twice exceptionality. Part 2 discusses the educational rights…

  11. Transition and Students with Twice Exceptionality

    Science.gov (United States)

    Prior, Susan

    2013-01-01

    "Twice exceptional" is one of the terms used to describe students who have giftedness and a disability. This is a small heterogeneous population of individual learners who are underserved in special, gifted, and mainstream education settings. Despite the availability of research on transition for students with disabilities, there is…

  12. 32 CFR 811.1 - Exceptions.

    Science.gov (United States)

    2010-07-01

    ... Department of Defense (Continued) DEPARTMENT OF THE AIR FORCE SALES AND SERVICES RELEASE, DISSEMINATION, AND SALE OF VISUAL INFORMATION MATERIALS § 811.1 Exceptions. The regulations in this part do not apply to: (a) Visual information (VI) materials made for the Air Force Office of Special Investigations for use...

  13. 12 CFR 229.13 - Exceptions.

    Science.gov (United States)

    2010-01-01

    ...) Redeposited checks. Sections 229.10(c) and 229.12 do not apply to a check that has been returned unpaid and redeposited by the customer or the depositary bank. This exception does not apply— (1) To a check that has... doubt collectibility—(1) In general. Sections 229.10(c) and 229.12 do not apply to a check deposited in...

  14. 31 CFR 211.3 - Exceptions.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 2 2010-07-01 2010-07-01 false Exceptions. 211.3 Section 211.3 Money and Finance: Treasury Regulations Relating to Money and Finance (Continued) FISCAL SERVICE, DEPARTMENT OF THE TREASURY FINANCIAL MANAGEMENT SERVICE DELIVERY OF CHECKS AND WARRANTS TO ADDRESSES OUTSIDE THE...

  15. 31 CFR 101.7 - Exceptions.

    Science.gov (United States)

    2010-07-01

    ... 31 Money and Finance: Treasury 1 2010-07-01 2010-07-01 false Exceptions. 101.7 Section 101.7 Money and Finance: Treasury Regulations Relating to Money and Finance MITIGATION OF FORFEITURE OF... smelting the gold coins exceeds the value of the gold bullion to be returned. ...

  16. Working with Navajo Parents of Exceptional Children.

    Science.gov (United States)

    Jones, Doris; And Others

    Undergraduate students at Northern Arizona University interviewed and surveyed 20 staff members at Kayenta Unified School District (KUSD) on the Navajo Reservation and 14 parents of exceptional Navajo children enrolled in KUSD. Both groups were asked to identify challenges affecting the working relationship between parents and school on a rural…

  17. Sound source localization and segregation with internally coupled ears

    DEFF Research Database (Denmark)

    Bee, Mark A; Christensen-Dalsgaard, Jakob

    2016-01-01

    to their correct sources (sound source segregation). Here, we review anatomical, biophysical, neurophysiological, and behavioral studies aimed at identifying how the internally coupled ears of frogs contribute to sound source localization and segregation. Our review focuses on treefrogs in the genus Hyla......, as they are the most thoroughly studied frogs in terms of sound source localization and segregation. They also represent promising model systems for future work aimed at understanding better how internally coupled ears contribute to sound source localization and segregation. We conclude our review by enumerating...

  18. To Have an Ear: Music and the Otological Experience.

    Science.gov (United States)

    Sattar, Atia

    2016-09-01

    This essay analyzes the historical development of otology in relation to music. It illustrates the integral role of music perception and appreciation in the study of hearing, where hearing operates not simply as a scientific phenomenon but signifies particular meaningful experiences in society. The four historical moments considered-Helmholtz's piano-keyed cochlea, the ear phonautograph, the hearing aid, and the cochlear implant-show how the sounds, perceptions, and instruments of music have mediated and continue to mediate our relationships with hearing. To have an ear, one does not just bear a physiological hearing mechanism; one experiences the aesthetics of musical sound.

  19. Cutaneous Squamous Cell Carcinoma with Invasion through Ear Cartilage

    Directory of Open Access Journals (Sweden)

    Julie Boisen

    2016-01-01

    Full Text Available Cutaneous squamous cell carcinoma of the ear represents a high-risk tumor location with an increased risk of metastasis and local tissue invasion. However, it is uncommon for these cancers to invade through nearby cartilage. Cartilage invasion is facilitated by matrix metalloproteases, specifically collagenase 3. We present the unusual case of a 76-year-old man with an auricular squamous cell carcinoma that exhibited full-thickness perforation of the scapha cartilage. Permanent sections through the eroded cartilage confirmed tumor invasion extending to the posterior ear skin.

  20. An assessment of individualized technical ear training for audio production.

    Science.gov (United States)

    Kim, Sungyoung

    2015-07-01

    An individualized technical ear training method is compared to a non-individualized method. The efficacy of the individualized method is assessed using a standardized test conducted before and after the training period. Participants who received individualized training improved better than the control group on the test. Results indicate the importance of individualized training for acquisition of spectrum-identification and spectrum-matching skills. Individualized training, therefore, should be implemented by default into technical ear training programs used in audio production industry and education.

  1. Reliability of real ear insertion gain in behind-the-ear hearing aids with different coupling systems to the ear canal.

    Science.gov (United States)

    Jespersen, Charlotte Thunberg; Møller, Kimi Nina

    2013-03-01

    The last decade has offered a multitude of instant fit coupling systems to be fitted with behind-the-ear (BTE) hearing aids. The impact of these designs on the reliability of real ear measurements (REMs) has not been reported. The purpose of this study was to obtain REM reliability data for instant fit coupling systems. REM reliability data was obtained for four different instant-fit coupling systems and for standard size 13 tubing and custom earmolds. REMs were performed for all five coupling systems two times and by two examiners. Ten normal-hearing individuals (20 ears) served as participants. The REM test-retest reliability is high for the four instant fit coupling systems as well as for the custom earmolds. The REM inter-examiner reliability is high for three of the four instant fit coupling systems. Carrying out REMs with instant fit coupling systems appears to be fundamentally no different than performing REMs with conventional hearing aids. For either, care should be taken in probe tube placement in terms of insertion depth and maintaining the probe tube placement, and other best practices regarding test environment and test setup should be observed.

  2. Is There Muslim Exceptionalism in Democracy Research?

    DEFF Research Database (Denmark)

    Hariri, Jacob Gerner

    , also, to alternative theories of the causes and correlates of democracy. This paper presents evidence against the notion of Muslim exceptionalism in democracy research. Thus, outside the European continent, territories that were governed earlier and more consistently by state organizations up......Casual observation suggests a negative association between Islam and democratic rule, as very few Muslim countries can be considered democracies. Recent research has conrmed this observation by documenting that the negative association is robust to dierent democracy indices, different samples, and...

  3. Discover Aggregates Exceptions over Hidden Web Databases

    OpenAIRE

    Suhaim, Saad Bin; Liu, Weimo; Zhang, Nan

    2016-01-01

    Nowadays, many web databases "hidden" behind their restrictive search interfaces (e.g., Amazon, eBay) contain rich and valuable information that is of significant interests to various third parties. Recent studies have demonstrated the possibility of estimating/tracking certain aggregate queries over dynamic hidden web databases. Nonetheless, tracking all possible aggregate query answers to report interesting findings (i.e., exceptions), while still adhering to the stringent query-count limit...

  4. Water Penetration into Middle Ear Through Ventilation Tubes in Children While Swimming

    Directory of Open Access Journals (Sweden)

    Mao-Che Wang

    2009-02-01

    Conclusion: Water penetration into the middle ear through ventilation tubes and middle ear infection are not likely when surface swimming. Children with ventilation tubes can enjoy swimming without protection in clean chlorinated swimming pools.

  5. Expression of macrophage migration inhibitory factor and CD74 in the inner ear and middle ear in lipopolysaccharide-induced otitis media.

    Science.gov (United States)

    Ishihara, Hisashi; Kariya, Shin; Okano, Mitsuhiro; Zhao, Pengfei; Maeda, Yukihide; Nishizaki, Kazunori

    2016-10-01

    Significant expression of macrophage migration inhibitory factor and its receptor (CD74) was observed in both the middle ear and inner ear in experimental otitis media in mice. Modulation of macrophage migration inhibitory factor and its signaling pathway might be useful in the management of inner ear inflammation due to otitis media. Inner ear dysfunction secondary to otitis media has been reported. However, the specific mechanisms involved are not clearly understood. The aim of this study is to investigate the expression of macrophage migration inhibitory factor and CD74 in the middle ear and inner ear in lipopolysaccharide-induced otitis media. BALB/c mice received a transtympanic injection of either lipopolysaccharide or phosphate-buffered saline (PBS). The mice were sacrificed 24 h after injection, and temporal bones were processed for polymerase chain reaction (PCR) analysis, histologic examination, and immunohistochemistry. PCR examination revealed that the lipopolysaccharide-injected mice showed a significant up-regulation of macrophage migration inhibitory factor in both the middle ear and inner ear as compared with the PBS-injected control mice. The immunohistochemical study showed positive reactions for macrophage migration inhibitory factor and CD74 in infiltrating inflammatory cells, middle ear mucosa, and inner ear in the lipopolysaccharide-injected mice.

  6. Measuring directional characteristics of in-ear recording devices

    DEFF Research Database (Denmark)

    Christensen, Flemming; Hoffmann, Pablo F.; Hammershøi, Dorte

    2013-01-01

    . The pinna and thereby also the natural sound transmission are altered by the inserted device. This paper presents a methodology for accurately measuring the directional dependent transfer functions of such in-ear devices. Pilot measurements on a commercial available device are presented and possibilities...

  7. Middle Ear Disorders and Hearing Loss in Native Hawaiian Preschoolers.

    Science.gov (United States)

    Pang-Ching, Glenn; And Others

    1995-01-01

    Native Hawaiian preschoolers (n=172) received a battery of tests that included pure-tone audiometry, tympanometry, acoustic reflectometry, and pneumatic otoscopy. Approximately 15% of children failed a majority of the tests. Results are discussed in comparison to other indigenous groups at risk for middle ear disorders and hearing loss.…

  8. Ear-EEG from generic earpieces: A feasibility study

    DEFF Research Database (Denmark)

    Kidmose, Preben; Looney, D; Jochumsen, Lars

    2013-01-01

    The use of brain monitoring based on EEG, in natural environments and over long time periods, is hindered by the limited portability of current wearable systems, and the invasiveness of implanted systems. To that end, we introduce an ear-EEG recording device based on generic earpieces which meets...

  9. Pathogenic Microbiological Flora Recovered From Ear, Nose And ...

    African Journals Online (AJOL)

    Background: to investigate the recovery of pathogenic bacteria, fungi and parasites isolated from ear, nose and throat specimens in large population group in a ... from nose specimens the most often isolated pathogenic bacteria is Staphylococcus aureus in 52.4%, Streptococcus spp. in 16% and Branhamella in 13% of ...

  10. Acute Phase Reactants in Immune-Related Inner Ear Disease ...

    African Journals Online (AJOL)

    In this study, the clinical profile of patients with immune-related inner ear disease (IRIED) was correlated with the laboratory results of acute phase reactants and quantitative immunoglobulin as ... The predisposing factor was presumed to be autoimmune in 7(48%), allergy in 6(40%) and one patient had trauma in addition.

  11. Ear care: Knowledge, attitude and practice amongst health ...

    African Journals Online (AJOL)

    Objective: Our study aims to ascertain the knowledge, attitude and practice of ear care amongst health care givers in our hospital in this cross-sectional study. Methods: In this cross-sectional study, validated questionnaires were filled by health professionals in our Teaching Hospital and analyzed. Results: There were 94 ...

  12. Investigation of the Chest-Ear Radio Propagation Channel

    DEFF Research Database (Denmark)

    Kvist, Søren Helstrup; Jakobsen, Kaj Bjarne

    2010-01-01

    The path gain (|S21|) between antennas on the chest and at the ear is presented as a function of the position of the antenna on the chest. A monopole antenna and a printed Inverted-F Antenna (IFA) are considered for placement on the chest. The path gain is found by HFSS simulations as well...

  13. Diagnosis and treatment of ear disease among children in the ...

    African Journals Online (AJOL)

    Audiologists and ENT registrars examined 2 036 children aged 10 years or younger by means of pure-tone audiometry, tympanometry and otoscopic examinations. Twenty per cent of these children had ear pathology and 7,5% had impaired hearing. Forty-three pus swabs taken from patients with suppurative otitis media ...

  14. Usefulness of CT in preoperative examinations for middle ear surgery

    Energy Technology Data Exchange (ETDEWEB)

    Kobayashi, Toshimitsu; Okitsu, Takuji; Sakurai, Tokio; Ikeda, Katsuhisa; Taniguchi, Kazuhiko; Takahashi, Kuniaki; Kusakari, Jun

    1985-02-01

    The usefulness of CT in preoperative examinations for middle ear surgery was evaluated on the basis of whether or not it can provide a surgon with useful information not available from the other preoperative examinations, such as microscopic examination, pure tone audiometry, impedance audiometry, equilibrium tests, conventional X-ray films, etc. The findings of CT were compared with those obatained during operations and the following conclusions were reached: CT is especially useful for the three purposes indicated below. (1) to determine the patency of the attic air route to the mastoid antrum. (2) to make differential diagnoses of middle ear diseases in the presence of obstructive pathology of the external auditory meatus. (3) to make a rough estimate of the extent of cholesteatoma growth in the middle ear cleft, and to diagnose labyrinthine fistulae. CT proved less effective or useless for the following three purposes. (1) to secure detailed information on the status of the ossicular chain. (2) to determine the precise extent of the growth of cholesteatoma. (3) to evaluate the postoperative status of the ear. (author).

  15. External ear anomalies and hearing impairment in Noonan Syndrome

    NARCIS (Netherlands)

    Trier, D.C. van; Nierop, J. van; Draaisma, J.M.T.; Burgt, I. van der; Kunst, H.P.; Croonen, E.A.; Admiraal, R.J.C.

    2015-01-01

    OBJECTIVE: This is the first cohort in which hearing impairment and external ear anomalies in Noonan Syndrome are described extensively. METHODS: Retrospective analysis of the otorhinolaryngological and clinical genetic data from 97 Noonan Syndrome (NS) patients. Forty-four NS patients were seen by

  16. Imaging evaluation of middle ear cholesteatoma: iconographic essay

    Energy Technology Data Exchange (ETDEWEB)

    Avila, Ana Flavia Assis de; Aburjeli, Bruna de Oliveira Melim; Moreira, Wanderval; Motta, Emilia Guerra Pinto Coelho; Ribeiro, Marcelo Almeida; Diniz, Renata Lopes Furletti Caldeira, E-mail: fauassis@hotmail.com [Hospital Mater Dei, Belo Horizonte, MG (Brazil)

    2013-06-15

    Middle ear cholesteatoma is a relevant and relatively common disease that may have severe consequences. In the present pictorial essay, the authors have selected illustrative examples of multislice computed tomography and magnetic resonance imaging depicting the main presentations of cholesteatomas, and describing their characteristics, locations, and major complications. (author)

  17. Dumbbell-shaped neurofibroma over the external ear

    Directory of Open Access Journals (Sweden)

    S S Shirol

    2015-01-01

    To the best of our knowledge, this is the first ever case to be reported of a dumbbell-shaped neurofibroma over the external ear and only the fourth case of neurofibromatosis type 1 (NF1 to be associated with Hashimoto thyroiditis.

  18. Bone-anchored hearing aids in unilateral inner ear deafness.

    NARCIS (Netherlands)

    Bosman, A.J.; Hol, M.K.S.; Snik, A.F.M.; Mylanus, E.A.M.; Cremers, C.W.R.J.

    2003-01-01

    In nine patients with unilateral deafness and normal hearing in the contralateral ear, measurements of sound localization and speech perception were obtained before intervention, with a conventional contralateral routing of sound (CROS) hearing aid and later with a bone-anchored hearing aid (BAHA)

  19. Microbiological Assessment of Bacterial Isolates from Ear, Nose And ...

    African Journals Online (AJOL)

    One hundred (100) from both male and female patients comprising 55 ear swabs, 30 and 15 throat and nose swabs respectively were screened between February and April 2014 and the samples were analysed using culture technique, direct microscopy and identification of bacteria (using API 20E strip). Finding from the ...

  20. [Ear prosthesis anchored on osseointegrated implants. Experience with 9 cases].

    Science.gov (United States)

    Charles, X; Piller, P; Hemar, P; Herman, D; Kennel, P; Riedinger, A M; Conraux, C

    1995-01-01

    The use of osseointegrated titanium implants has improved the quality of auricle prosthesis fixation. Between december 1993 and july 1994, twenty two titanium fixtures have been surgically implanted in nine patients in the Ear Nose Throat department of the university hospital of Strasbourg. This method of auricle amputation repair achieves a good esthetic result with a low rate of postoperative complications.

  1. MicroRNAs in sensorineural diseases of the ear

    Directory of Open Access Journals (Sweden)

    Kathy eUshakov

    2013-12-01

    Full Text Available Non-coding microRNAs have a fundamental role in gene regulation and expression in almost every multicellular organism. Only discovered in the last decade, microRNAs are already known to play a leading role in many aspects of disease. In the vertebrate inner ear, microRNAs are essential for controlling development and survival of hair cells. Moreover, dysregulation of microRNAs has been implicated in sensorineural hearing impairment, as well as in other ear diseases such as cholesteatomas, vestibular schwannomas and otitis media. Due to the inaccessibility of the ear in humans, animal models have provided the optimal tools to study microRNA expression and function, in particular mice and zebrafish. A major focus of current research has been to discover the targets of the microRNAs expressed in the inner ear, in order to determine the regulatory pathways of the auditory and vestibular systems. The potential for microRNA manipulation in development of therapeutic tools for hearing impairment is as yet unexplored, paving the way for future work in the field.

  2. Rehabilitation with ear prosthesis linked to osseointegrated implants.

    Science.gov (United States)

    Goiato, Marcelo C; dos Santos, Daniela M; Haddad, Marcela F; Moreno, Amália

    2012-06-01

    The absence of an ear, which can be the result of a congenital malformation, surgical tumour resection or traumatic injury, is a significant aesthetic problem. Attachment of ear prostheses with adhesives can cause local irritation for the wearer and affect the colour of the prostheses. Use of implants in craniofacial reconstruction can improve the retention and stability of prostheses giving to patient greater comfort and security relative to adhesive attachment. The aim of this report was to present a clinical case of a mutilated patient who was rehabilitated by means of installing an ear prosthesis fixed through osseointegrated implants. The patient had two implants installed in the mastoid region that were linked by a bar, and a clip-type system was used. The ear prosthesis was constructed from medical-use silicone, pigmented to match the patient's skin colour and linked to the retention system. The patient's rehabilitation was satisfactory from both a functional and an aesthetic point of view, making it possible for the patient to return to a normal social life and regain lost self-esteem. © 2012 The Gerodontology Society and John Wiley & Sons A/S.

  3. Middle Ear Infection (Chronic Otitis Media) and Hearing Loss

    Science.gov (United States)

    ... loss Conductive hearing loss is a form of hearing impairment due to a lesion in the external auditory ... in the ear, which is more prevalent in adults and characterized by formation of soft, vascular bone leading to progressive conductive hearing loss. It occurs due to fixation of the ...

  4. Genetic loci mapping for ear axis weight using recombinant inbred ...

    African Journals Online (AJOL)

    Ear axis weight (EAW) is one of the important agronomic traits in maize (Zea mays L.), related to yield. To understand its genetic basis, a recombinant inbred line (RIL) population, derived from the cross Mo17 × Huangzao4, was used for quantitative trait locus mapping (QTL) for EAW under high and low nitrogen (N) regimes.

  5. Imaging evaluation of middle ear cholesteatoma: iconographic essay

    Directory of Open Access Journals (Sweden)

    Ana Flavia Assis de Avila

    2013-07-01

    Full Text Available Middle ear cholesteatoma is a relevant and relatively common disease that may have severe consequences. In the present pictorial essay, the authors have selected illustrative examples of multislice computed tomography and magnetic resonance imaging depicting the main presentations of cholesteatomas, and describing their characteristics, locations, and major complications.

  6. Components of genetic variability of ear length of silage maize

    Directory of Open Access Journals (Sweden)

    Sečanski Mile

    2006-01-01

    Full Text Available The objective of this study was to evaluate following parameters of the ear length of silage maize: variability of inbred lines and their diallel hybrids, superior-parent heterosis and genetic components of variability and habitability on the basis of a diallel set. The analysis of genetic variance shows that the additive component (D was lower than the dominant (H1 and H2 genetic variances, while the frequency of dominant genes (u for this trait was greater than the frequency of recessive genes (v Furthermore, this is also confirmed by the dominant to recessive genes ratio in parental inbreeds for the ear length (Kd/Kr> 1, which is greater than unity during both investigation years. The calculated value of the average degree of dominance √H1/D is greater than unity, pointing out to superdominance in inheritance of this trait in both years of investigation, which is also confirmed by the results of Vr/Wr regression analysis of inheritance of the ear length. As a presence of the non-allelic interaction was established it is necessary to study effects of epitasis as it can have a greater significance in certain hybrids. A greater value of dominant than additive variance resulted in high broad-sense habitability for ear length in both investigation years.

  7. [Cutaneous tuberculosis of the ear due to Mycobacterium bovis].

    Science.gov (United States)

    Lhote, R; Raskine, L; Gottlieb, J; Mougari, F; Lafaurie, M; Vignon-Pennamen, M-D; Bagot, M; Petit, A; Cordoliani, F

    2016-10-01

    Isolated cutaneous tuberculosis is uncommon, accounting for only 0.14 to 5% of Mycobacterium tuberculosis infections. We report a rare case of ear cutaneous tuberculosis due to Mycobacterium bovis in an immunocompetent woman. A 59-year-old woman presented an erythematous and scaly lesion of the ear present for two years. The histological findings were compatible with a diagnosis of sarcoidosis, with non-necrotic granuloma. After failure of dermal corticosteroid therapy, a further biopsy identified M. bovis; the patient was cured following anti-tubercular treatment. Ear lesions are predominantly associated with tumors, fungal infections, chondritis, lupus and sarcoidosis. The ear, like the face in general, is a classic localization of lupus vulgaris, a chronic form of confined tuberculosis infection with progressive evolution. The paucibacillary nature of these lesions is the reason why their diagnosis is based in some cases on clinical, histological and immunological findings without bacteriological evidence. However, given the potential therapeutic implications, it is important to push the microbiological analysis as far as possible. In our case, culture and identification provided evidence of M. bovis infection, enabling suitable and effective therapy to be given. Copyright © 2016 Elsevier Masson SAS. All rights reserved.

  8. Comparison of blackbodies for calibration of infrared ear thermometers

    DEFF Research Database (Denmark)

    Pusnik, Igor; Clausen, Sønnik; Favreau, Jacques-Olivier

    2010-01-01

    this is the standard EN 12470-5, which is a harmonised standard and supports the Medical Device Directive (MDD). Other standards are ASTM standard, Designation E 1965 – 98 and the draft of Japan Industrial Standard JIS T 4207, 2005: Japanese Industrial Standard: “infrared ear thermometers.”. The International...

  9. Antimicrobial activity of moringa on ear, nose and throat associated ...

    African Journals Online (AJOL)

    This study was aimed at evaluating the antimicrobial activity of Moringa on ear, nose and throat associated fungi and vancomycin resistant cocci. The plant material was extracted with methanol and petroleum ethe and screened for phytochemical contents. The microbial isolates were obtained from females and males ...

  10. Comparison of Blackbodies for Calibration of Infrared Ear Thermometers

    DEFF Research Database (Denmark)

    Pušnik, Igor; Clausen, Sønnik; Favreau, Jacques-Olivier

    2011-01-01

    The article presents the results of the EURAMET Project No. 927 “Comparison of blackbodies for calibration of infrared ear thermometers (IRETs)”. The objective of the comparison was to determine the agreement of blackbodies used for the calibration of IRETs among European national laboratories...

  11. Middle ear effusion from metastatic carcinoma of the breast | Okpala ...

    African Journals Online (AJOL)

    Carcinoma of the breast can metastasise to many organs. Metastasis to the temporal bone is rare and even when it does, it would usually spread to other parts of the body. This is a report of isolated metastasis to the temporal bone with middle ear effusion.

  12. Sub-clinical middle ear malfunctions in elderly patients; prevalence ...

    African Journals Online (AJOL)

    Sub-clinical middle ear malfunctions in elderly patients; prevalence, pattern and predictors. ... Mean age was 70.1 ± 6.2 years, 77.7% were married. Prevalence of S-MEM ... Independent clinical predictors of S-MEM included previous head injury, diabetes, history of osteoarthritis of knee joints, and absent acoustic reflex.

  13. Treatment of age-related hearing loss in dogs with the vibrant soundbridge middle ear implant: short-term results in 3 dogs.

    Science.gov (United States)

    Ter Haar, G; Mulder, J J; Venker-van Haagen, A J; van Sluijs, F J; Snik, A F; Smoorenburg, G F

    2010-01-01

    Age-related hearing loss (ARHL), or presbycusis, is the most common form of acquired hearing loss in dogs. Middle ear implants have been used successfully in people with ARHL who cannot benefit from conventional hearing aids. Audibility improves in dogs with ARHL after implantation of the Vibrant Soundbridge (VSB) middle ear implant. Three Beagle dogs with ARHL, mean age 11.1 years. The dogs were assessed pre- and postoperatively by brainstem-evoked response audiometry (BERA), otoscopy, and computed tomography scans of the ears. A VSB middle ear implant was implanted unilaterally. Three months later the functionality of the implants was assessed by auditory steady-state responses (ASSRs), after which the dogs were euthanized for histopathological examination. The VSB was implanted successfully in all dogs. Recovery from surgery was uneventful, except for transient facial nerve paralysis in 2 dogs. ASSRs showed that hearing improved after activation of the implants with a mean of 20.7, 13, and 16.3 dB at 1, 2, and 4 kHz, respectively. The implantation procedure did not affect residual hearing (with inactive implants) as measured by BERA. Implantation of the VSB resulted in lower ASSR thresholds, but only at the higher gain settings of the audioprocessor. As in humans, a more powerful audioprocessor is required to treat sensorineural hearing loss exceeding 20 dB in dogs. A substantial improvement in patient-owner communication will have to be demonstrated in future studies before the procedure can be recommended in clinical practice.

  14. DIAGNOSIS AND TREATMENT OF COMBAT INJURIES OF THE EAR

    Directory of Open Access Journals (Sweden)

    V. I. Egorov

    2016-01-01

    Full Text Available The authors  discuss specifics of the  wound  process in modern  combat  injury of the  ear, significance  and  specifics of diagnosis  of gunshot ear injury related to individual characteristics of gunshot  wounds  with consideration of the  accepted anatomical classification of the injured zones. Typical complications of ear injuries are described that  can result in death. The authors  analyze an approach  to  surgical treatment of traumatic  ear injuries based on their own experience, including non-conventional choice  of the  type  of surgery. They proposed an algorithm to assess the auditory and  vestibular  analyzers in the  injured based  on their analysis of date obtained from 772 patients, determine types of pure-tone audiograms  typical for acoustic  and  barotrauma,  and  underline  the informative  value  of optokinetic  nystagmus   assessment. Various types of conservative  management of the sequelae of the mine-blast ear trauma are discussed  aimed at potential  minimization of the  post-traumatic reactions  of the  auditory  and vestibular  analyzers.  The  authors  draw attention to the importance of early treatment, the highest effectiveness of combination therapy and plasmapheresis. They propose  their  experience  of care for the above mentioned traumatic injuries to improve treatment efficacy.

  15. Salvage of Ear Framework Exposure in Total Auricular Reconstruction.

    Science.gov (United States)

    Kim, Young Soo; Yun, In Sik; Chung, Seum

    2017-02-01

    One of the most common complications of total auricular reconstruction is delayed wound healing, which results in skin necrosis and exposure of the ear framework. Various options exist for salvage of the exposed ear framework. From January 2009 to May 2014, 149 patients underwent total auricular reconstruction using an autogenous cartilage framework or porous polyethylene framework (Medpor; Stryker, USA). An autogenous cartilage framework was used in 48 patients, and a Medpor framework was used in 101 cases. Three cases of framework exposure (3/48, 6.3%) were observed among the patients treated with an autogenous cartilage framework. In contrast, framework exposure took place in 11 patients who were treated with a Medpor framework (11/101, 10.9%). Depending on the method of total ear reconstruction and the location of exposure, the authors used local skin flaps, temporoparietal fascia flaps, deep temporal fascia (DTF) flaps, or mastoid fascia (MF) flaps with skin grafting. Among the 11 patients who experienced framework exposure after being treated with a Medpor framework, a DTF flap with skin grafting was used in 6 patients and an MF flap with skin grafting in 6 patients; 1 patient was treated with both a DTF flap and an MF flap. All 3 cases of cartilage framework exposure were salvaged using a temporoparietal fascia flap with skin grafting, and a local skin flap was used in 1 case. In all 3 cases, the exposed framework was completely covered with the flap, and the reconstructed ears showed well-defined convolutions. Salvage of framework exposure remains a challenging issue in total auricular reconstruction. However, appropriate wound management using various flaps allows the reconstructed ear to be safely preserved.

  16. Monitoring inner ear pressure changes in normal guinea pigs induced by the Meniett (R) 20

    NARCIS (Netherlands)

    Feijen, RA; Segenhout, JM; Wit, HP; Albers, FWJ

    2000-01-01

    The inner ear fluid pressure of guinea pigs was measured during a series of complex escalating middle ear pressure changes induced by the Meniett(R)20 (Pascal Medical, Sweden), a possible therapeutic pressure generator to be used by patients with Meniere's disease. Middle ear pressure changes were

  17. Forward and reverse middle ear frequency responses with various terminal loads

    CSIR Research Space (South Africa)

    Thejane, T

    2012-09-01

    Full Text Available . The cochlear loads used are an open circuit, a resistive load and an RCL load. The outer ear loads used are an open circuit, a outer ear transmission line model having a constant auditory canal radius and an outer ear transmission line model having a varying...

  18. A Case with Mega Cisterna Magna Renal and Ear Anomalies: Is This a New Syndrome?

    Directory of Open Access Journals (Sweden)

    Çapan Konca

    2013-01-01

    Full Text Available Background. Extrarenal pathologies may be associated with renal position and fusion anomalies. According to the literature, our patient is the first horseshoe kidney case that had mega cisterna magna, arachnodactyly, and mild mental retardation. Case Report. A 9-year-old boy admitted because of the myoclonic jerks. He had a dysmorphic face, low-set and cup-shaped ears, arachnodactyly, and mild mental retardation. The patient’s laboratory findings were normal except for a mild leucocytosis and hypochromic microcytic anemia. His cerebrospinal fluid was cytologically and biochemically normal. Cranial MRI revealed 1.5 cm diametered mega cisterna magna in the retrocerebellar region. Although there were no significant epileptical discharges in the electroencephalography, there were slow wave discharges arising from the anterior regions of both hemispheres. Because he had stomachache, abdominal ultrasonography was performed, and horseshoe kidney was determined. Abdominal CT did not reveal any abnormalities except the horseshoe kidney. There were not any cardiac pathologies in echocardiography. He had normal 46XY karyotype and there were no repeated chromosomal derangements, but we could not evaluate for molecular and submicroscopic somatic changes. He was treated with valproic acid and myoclonic jerks did not repeat. Conclusion. We suggest that the presence of these novel findings may represent a newly recognized, separate syndrome.

  19. Exceptional Points in three-dimensional Nanostructures

    CERN Document Server

    Kodigala, Ashok; Kanté, Boubacar

    2016-01-01

    Exceptional points (EPs) are degeneracies in open wave systems where at least two energy levels and their corresponding eigenstates coalesce. We report evidence of the existence of EPs in 3D plasmonic nanostructures. The systems are composed of coupled plasmonic nanoresonators and can be judiciously and systematically driven to EPs by controlling symmetry-compatible modes via their near-field and far-field interactions. The proposed platform opens the way to the investigation of EPs for enhanced light-matter interactions and applications in communication, sensing and imaging.

  20. Exceptional Family Transitional Training Program (EFTTP)

    Science.gov (United States)

    2009-01-01

    Stilwell Drive Fort Monroe, VA 23651 O: 1-757-788-3535 F: 1-757-788-3713 FORT MYER, VA ACS-EFMP 201 Custer Road Fort Myer, VA 22211 O: 1-703-696-8467 F...1895-61-6323 US NSGA RAF MENWITH HILL Commanding Officer US NSGA RAF Menwith Hill PSC 45 Unit 8470 APO AE 09468 O: 011-44-1423-846717 DSN: 314-262-6717...Program 151 Bernard Road Fort Monroe, VA 23651 Telephone: 757-788-3878 Army Community Service Exceptional Family Member Program Building 201, Custer

  1. Exceptional Points and Dynamical Phase Transitions

    Directory of Open Access Journals (Sweden)

    I. Rotter

    2010-01-01

    Full Text Available In the framework of non-Hermitian quantum physics, the relation between exceptional points,dynamical phase transitions and the counter intuitive behavior of quantum systems at high level density is considered. The theoretical results obtained for open quantum systems and proven experimentally some years ago on a microwave cavity, may explain environmentally induce deffects (including dynamical phase transitions, which have been observed in various experimental studies. They also agree(qualitatively with the experimental results reported recently in PT symmetric optical lattices.

  2. Nonlinear processing of a multicomponent communication signal by combination-sensitive neurons in the anuran inferior colliculus.

    Science.gov (United States)

    Lee, Norman; Schrode, Katrina M; Bee, Mark A

    2017-09-01

    Diverse animals communicate using multicomponent signals. How a receiver's central nervous system integrates multiple signal components remains largely unknown. We investigated how female green treefrogs (Hyla cinerea) integrate the multiple spectral components present in male advertisement calls. Typical calls have a bimodal spectrum consisting of formant-like low-frequency (~0.9 kHz) and high-frequency (~2.7 kHz) components that are transduced by different sensory organs in the inner ear. In behavioral experiments, only bimodal calls reliably elicited phonotaxis in no-choice tests, and they were selectively chosen over unimodal calls in two-alternative choice tests. Single neurons in the inferior colliculus of awake, passively listening subjects were classified as combination-insensitive units (27.9%) or combination-sensitive units (72.1%) based on patterns of relative responses to the same bimodal and unimodal calls. Combination-insensitive units responded similarly to the bimodal call and one or both unimodal calls. In contrast, combination-sensitive units exhibited both linear responses (i.e., linear summation) and, more commonly, nonlinear responses (e.g., facilitation, compressive summation, or suppression) to the spectral combination in the bimodal call. These results are consistent with the hypothesis that nonlinearities play potentially critical roles in spectral integration and in the neural processing of multicomponent communication signals.

  3. [Diagnostic significance of multi-slice computed tomography imaging in congenital inner ear malformations].

    Science.gov (United States)

    Ma, Hui; Han, Ping; Liang, Bo; Liu, Fang; Tian, Zhi-Liang; Lei, Zi-Qiao; Li, You-Lin; Kong, Wei-Jia

    2005-04-01

    To evaluate the feasibility and usability of multi-slice computed tomography (MSCT) in congenital inner ear malformations. Fourty-four patients with sensorineural hearing loss (SNHL) were examined by a Somatom Sensation 16 (siemens, Germany) CT scanner with following parameters: 120 kV, 100 mAs, 0.75 mm collimation, 1 mm reconstruction increment, a pitch factor of 1 and a field of view of 100 mm. The axial images of interested ears were reconstructed with 0.1 mm reconstruction increment, and a field of view of 50 mm. The 3D reconstructions were done with volume rendering technique (VRT) on the workstation (3D Virtuoso and Wizard,siemens). Twenty-five patients were normal and 19 patients (36 ears) were congenital inner ear malformations among 44 patients scanned with MSCT. Of the malformations, all the axial, MPR and VRT images can display the site and degree in 33 ears. VRT images were superior to the axial images in displaying the malformations in 3 ears with the small lateral semicircular canal malformations. The malformations were Michel deformity (1 ear), common cavity deformity (3 ears), incomplete partition I (3 ears), incomplete partition II (Mondini deformity, 5 ears), vestibular and semicircular canal malformations( 14 ears), vestibular aqueduct dilate( 16 ears, of which 6 ears accompanied by other malformations), the internal auditory canal malformation(8 ears, all accompanied by other malformations). MSCT allows a comprehensively assessing various congenital ear malformations through high quality MPR and VRT reconstructions. VRT images can display the site and degree of the malformations three-dimensionally and intuitionisticly. It is very useful to the cochlear implantation.

  4. Evidence for a Right-Ear Advantage in Newborn Hearing Screening Results.

    Science.gov (United States)

    Ari-Even Roth, Daphne; Hildesheimer, Minka; Roziner, Ilan; Henkin, Yael

    2016-12-06

    The aim of the present study was to investigate the effect of ear asymmetry, order of testing, and gender on transient-evoked otoacoustic emission (TEOAE) pass rates and response levels in newborn hearing screening. The screening results of 879 newborns, of whom 387 (study group) passed screening successfully in only one ear in the first TEOAE screening, but passed screening successfully in both ears thereafter, and 492 (control group) who passed screening successfully in both ears in the first TEOAE, were retrospectively examined for pass rates and TEOAE characteristics. Results indicated a right-ear advantage, as manifested by significantly higher pass rates in the right ear (61% and 39% for right and left ears, respectively) in the study group, and in 1.75 dB greater TEOAE response amplitudes in the control group. The right-ear advantage was enhanced when the first tested ear was the right ear (76%). When the left ear was tested first, pass rates were comparable in both ears. The right-ear advantage in pass rates was similar in females versus males, but manifested in 1.5 dB higher response amplitudes in females compared with males, regardless of the tested ear and order of testing in both study and control groups. The study provides further evidence for the functional lateralization of the auditory system at the cochlear level already apparent soon after birth in both males and females. While order of testing plays a significant role in the asymmetry in pass rates, the innate right-ear advantage seems to be a more dominant contributor. © The Author(s) 2016.

  5. Ear acupoint detection before and after hysteroscopy: is it possible to clarify the representation of the uterus on the outer ear?

    Science.gov (United States)

    Romoli, Marco; Allais, Gianni; Bellu, Daniela; De Ramundo, Biagina; Gabellari, Ilaria Castagnoli; Giommi, Andrea; Benedetto, Chiara

    2010-12-01

    In the auricular maps introduced over the past 50 years by the French and Chinese schools, most organs and systems overlap consistently. One exception is the reproductive system, which shows a markedly different somatotopic representation-for example, for the uterus and the ovary. To identify the distribution of points with increased tenderness to pressure or with reduced electrical resistance, on the outer ear of a group of women undergoing hysteroscopy. For diagnostic purposes the auricles of 78 women were examined before and after hysteroscopy using a pain-pressure test and electrical skin resistance test. The points identified were transcribed onto a graphic system called Sectogram. Spatial cluster analysis was used to identify the statistically significant clusters of sectors with a higher concentration of points appearing after hysteroscopy. The points identified after hysteroscopy tend to be concentrated in specific areas not previously recognised and which only partially overlap with the French and Chinese representation of the uterus. When auricular acupuncture is applied to reduce discomfort during hysteroscopy, particular attention must be paid when choosing the points/areas to be stimulated, which are not only those indicated in the Chinese or French maps.

  6. On the Scalar Manifold of Exceptional Supergravity

    CERN Document Server

    Cacciatori, Sergio L; Marrani, Alessio

    2012-01-01

    We construct two parametrizations of the non compact exceptional Lie group G=E7(-25), based on a fibration which has the maximal compact subgroup K=(E6 x U(1))/Z_3 as a fiber. It is well known that G plays an important role in the N=2 d=4 magic exceptional supergravity, where it describes the U-duality of the theory and where the symmetric space M=G/K gives the vector multiplets' scalar manifold. First, by making use of the exponential map, we compute a realization of G/K, that is based on the E6 invariant d-tensor, and hence exhibits the maximal possible manifest [(E6 x U(1))/Z_3]-covariance. This provides a basis for the corresponding supergravity theory, which is the analogue of the Calabi-Vesentini coordinates. Then we study the Iwasawa decomposition. Its main feature is that it is SO(8)-covariant and therefore it highlights the role of triality. Along the way we analyze the relevant chain of maximal embeddings which leads to SO(8). It is worth noticing that being based on the properties of a "mixed" Freu...

  7. Bone Signaling in Middle Ear Development: A Genome‐Wide Differential Expression Analysis

    DEFF Research Database (Denmark)

    Nielsen, Michelle Christine; Bertelsen, Tomas Martin; Friis, Morten

    2014-01-01

    Common middle ear diseases may affect bone behavior in the middle ear air cell system. To understand this pathologic pneumatization, the normal development of bone in the middle ear should be investigated. The objective of this study was to analyze gene expression of bone‐related signaling factors...... sets may also play important roles during pathologic pneumatization of the middle ear air cell system in common middle ear diseases. In addition, this study suggests that the control of growth rate and wall thickness from resorptive as well as formative signals all originate from the inner lining cells...

  8. Challenges in fitting a hearing aid to a severely collapsed ear canal and mixed hearing loss.

    Science.gov (United States)

    Oeding, Kristi; Valente, Michael; Chole, Richard

    2012-04-01

    Collapsed ear canals typically occur when an outside force, such as a headset for audiometric testing, is present. However, when a collapsed ear canal occurs without external pressure, this creates a challenge not only for performing audiometric testing but also for coupling a hearing aid to the ear canal. This case report highlights the challenges associated with fitting a hearing aid on a patient with a severe anterior-posterior collapsed ear canal with a mixed hearing loss. A 67-yr-old female originally presented to Washington University in St. Louis School of Medicine in 1996 with a long-standing history of bilateral otosclerosis. She had chronic ear infections in the right ear and a severely collapsed ear canal in the left ear and was fit with a bone anchored hearing aid (BAHA®) on the right side in 2003. However, benefit from the BAHA started to decrease due to changes in hearing, and a different hearing solution was needed. It was proposed that a hearing aid be fit to her collapsed left ear canal; however, trying to couple a hearing aid to the collapsed ear canal required unique noncustom earmold solutions. This case study highlights some of the obstacles and potential solutions for coupling a hearing aid to a severely collapsed ear canal. American Academy of Audiology.

  9. High Intensity Pressure Noise Transmission in Human Ear: A Three Dimensional Simulation Study

    Science.gov (United States)

    Hawa, Takumi; Gan, Rong; Leckness, Kegan

    2015-03-01

    High intensity pressure noise generated by explosions and jet engines causes auditory damage and hearing loss of the military service personals, which are the most common disabilities in the veterans. Authors have investigated the high intensity pressure noise transmission from the ear canal to middle ear cavity. A fluid-structure interaction with a viscoelastic model for the tympanic membrane (TM) as well as the ossicular chain has been considered in the study. For the high intensity pressure simulation the geometry of the ear was based on a 3D finite element (FE) model of the human ear reported by Gan et al. (Ann Biomed Eng 2004). The model consists of the ear canal, TM, ossicular chain, and the middle ear cavity. The numerical approach includes two steps: 1) FE based finite-volume method simulation to compute pressure distributions in the ear canal and the middle ear cavity using CFX; and 2) FE modeling of TM and middle ear ossicles in response to high intensity sound using multi-physics analysis in ANSYS. The simulations provide the displacement of the TM/ossicular chain and the pressure fields in the ear canal and the middle ear cavity. These results are compared with human temporal bone experimental data obtained in our group. This work was supported by DOD W81XWH-14-1-0228.

  10. Notas sobre predação em uma taxocenose de anfíbios anuros no sudeste do Brasil Predation notes in an anuran amphibians assemblage from southeastern Brazil

    Directory of Open Access Journals (Sweden)

    José P. Pombal Jr

    2007-01-01

    Full Text Available Anfíbios anuros são predados por todos os grupos de vertebrados e muitos invertebrados. Todavia os estudos sobre predação em anfíbios anuros ainda são esparsos e anedóticos. Neste estudo são fornecidas informações sobre predação de anuros de uma assembléia no sudeste do Brasil. Invertebrados (aranhas e barata d’agua, a rã Leptodactylus cf. ocellatus e cinco espécies serpentes (quatro Colubridae e um Viperidae predaram espécies ou indivíduos de pequeno porte.Anuran amphibians are preyer by all vertebrate groups and several invertebrates. However, predation studies on amphibians are still occasional and anecdotic. Herein, informations on predation of an anuran assemblage of southeastern Brazil are provided. Invertebrates (spiders and water bugs, the frog Leptodactylus cf. ocellatus, and five snake species (four Colubridae and one Viperidae preyer on small individuals or small anuran species.

  11. Do helmets worn for hurling fail to protect the ear? Identification of an emerging injury pattern.

    LENUS (Irish Health Repository)

    Martin-Smith, James D

    2012-12-01

    Hurling is an Irish national game of stick and ball known for its ferocity, played by 190 000 players. Facial injuries were common but have been significantly reduced by legislation enforcing compulsory helmet wearing. Current standard helmets worn by hurlers do not offer protection to the external ear. Here we describe an emerging pattern of ear injuries and demonstrate the risk of external ear injuries in hurlers complying with current helmet safety standards. A 6-month retrospective analysis was carried out of patients attending Cork University Hospital (CUH) with ear lacerations sustained while hurling. Patient notes were reviewed and helmet manufacturers were interviewed. Seven patients were identified, all of whom sustained complex through ear lacerations while wearing helmets complying with current safety standards. Current helmet design fails to protect the external ear placing it at an increased risk of injury, a potential solution is to include ear protection in the helmet design.

  12. Modeling Analysis of Biomechanical Changes of Middle Ear and Cochlea in Otitis Media

    Science.gov (United States)

    Gan, Rong Z.; Zhang, Xiangming; Guan, Xiying

    2011-11-01

    A comprehensive finite element (FE) model of the human ear including the ear canal, middle ear, and spiral cochlea was developed using histological sections of human temporal bone. The cochlea was modeled with three chambers separated by the basilar membrane and Reissner's membrane and filled with perilymphatic fluid. The viscoelastic material behavior was applied to middle ear soft tissues based on dynamic measurements of tissues in our lab. The model was validated using the experimental data obtained in human temporal bones and then used to simulate various stages of otitis media (OM) including the changes of morphology, mechanical properties, pressure, and fluid level in the middle ear. Function alterations of the middle ear and cochlea in OM were derived from the model and compared with the measurements from temporal bones. This study indicates that OM can be simulated in the FE model to predict the hearing loss induced by biomechanical changes of the middle ear and cochlea.

  13. Short communication: QTL mapping for ear tip-barrenness in maize

    Energy Technology Data Exchange (ETDEWEB)

    Ding, J.; Ma, J.; Chen, J.; Ai, T.; Li, Z.; Tian, Z.; Wu, S.; Chen, W.; Wu, J.

    2016-11-01

    Barren tip on corn ear is an important agronomic trait in maize, which is highly associated with grain yield. Understanding the genetic basis of tip-barrenness may help to reduce the ear tip-barrenness in breeding programs. In this study, ear tip-barrenness was evaluated in two environments in a F2:3 population, and it showed significant genotypic variation for ear tip-barrenness in both environments. Using mixed-model composite interval mapping method, three additive effects quantitative trait loci (QTL) for ear tip-barrenness were mapped on chromosomes 2, 3 and 6, respectively. They explained 16.6% of the phenotypic variation, and no significant QTL × Environment interactions and digenic interactions were detected. The results indicated that additive effect was the main genetic basis for ear tip-barrenness in maize. This is the first report of QTL mapped for ear tip-barrenness in maize. (Author)

  14. The external and middle ear of the striped dolphin Stenella coeruleoalba (Meyen 1833).

    Science.gov (United States)

    Sassu, R; Cozzi, B

    2007-06-01

    The ear of cetaceans, and especially the middle ear, is very different from that of terrestrial mammals and shows specific adaptations to diving. Our research, performed on six Striped dolphins (Stenella coeruleoalba) stranded along the Italian coasts of the Mediterranean Sea, concentrated on the morphology of the external and middle ear of this species. We report the findings using a proper Veterinary Anatomical Nomenclature and describe the characteristics of the auditory meatus of the external ear and the presence and morphology of the erectile tissue in the middle ear. Our anatomical and histological data highlight the structure and possible functions of the corpus cavernosum located in the middle ear of the Striped dolphin, and suggest a possible role for this structure in relation to pressure regulation during diving. Many of our observations indicate the existence of an internal regulatory system able to prevent barotraumas by regulating pressure and volume inside the middle ear cavity.

  15. Luc Besson : entre exception culturelle et Hollywood

    OpenAIRE

    Warczinski, Anne

    2013-01-01

    « L’exception culturelle franco-française est morte » (cité dans L’Express 19.11.2009). C’est ce que Jean-Marie Messier, président et directeur général de Vivendi (Altman 2002), a déclaré lors de la fusion de son entreprise avec la société de production américaine Universal en 2001 à New York (Vidal/Ministère de la culture et de la communication 2002). Cette déclaration a provoqué l’outrage aussi bien dans le gouvernement français que parmi les professionnels du cinéma, d’autant plus que Mess...

  16. Transporting "exceptional cargo" on the CERN sites

    CERN Multimedia

    EN Department

    2012-01-01

    When the Transport Service is managing "exceptional cargo", the driver and the escort are often in charge of an operation involving equipment worth many hundred thousand francs. Equipment that may well be irreplaceable for a facility or an experiment.   The members of the Transport Service who carry out these tasks are very professional and are – needless to say – highly concentrated on the job. They count on your understanding and support in the traffic on site. Their convoys are – for good reasons – moving slowly. Kindly do not overtake, do not cut in in front of them and do not drive too closely. Respect the escort and do not position yourself between the truck and the escort vehicles. The EN department counts on your courtesy on the road.  

  17. Exceptionally elevated triglyceride in severe lipemia retinalis.

    Science.gov (United States)

    Yin, Han Y; Warman, Roberto; Suh, Edward H; Cheng, Anny Ms

    2016-01-01

    To report a case of successful treatment for severe lipemia retinalis with extreme severe hypertriglyceridemia (sHTG). Observational case report. A 6-week-old infant with severe lipemia retinalis manifested diffuse creamy retinal vessels complicated with vulvar xanthomas. Extreme sHTG with 185-folds of the normal level was reported. Chromosome microarray and lipid gene sequencing confirmed a homozygous lipoprotein lipase gene coding mutation. Under strict adherence to a high medium-chain triglycerides formula and discontinuation of breast milk, the lipemia retinalis and vulval lesions resolved along with a stable plasma lipid level throughout the follow-up period of 6 months. Strict adherence to a low-fat diet without breast milk appears to be effective in treating infants with severe lipemia retinalis associated with exceptionally high triglycerides.

  18. Air-leak effects on ear-canal acoustic absorbance.

    Science.gov (United States)

    Groon, Katherine A; Rasetshwane, Daniel M; Kopun, Judy G; Gorga, Michael P; Neely, Stephen T

    2015-01-01

    Accurate ear-canal acoustic measurements, such as wideband acoustic admittance, absorbance, and otoacoustic emissions, require that the measurement probe be tightly sealed in the ear canal. Air leaks can compromise the validity of the measurements, interfere with calibrations, and increase variability. There are no established procedures for determining the presence of air leaks or criteria for what size leak would affect the accuracy of ear-canal acoustic measurements. The purpose of this study was to determine ways to quantify the effects of air leaks and to develop objective criteria to detect their presence. Air leaks were simulated by modifying the foam tips that are used with the measurement probe through insertion of thin plastic tubing. To analyze the effect of air leaks, acoustic measurements were taken with both modified and unmodified foam tips in brass-tube cavities and human ear canals. Measurements were initially made in cavities to determine the range of critical leaks. Subsequently, data were collected in ears of 21 adults with normal hearing and normal middle-ear function. Four acoustic metrics were used for predicting the presence of air leaks and for quantifying these leaks: (1) low-frequency admittance phase (averaged over 0.1-0.2 kHz), (2) low-frequency absorbance, (3) the ratio of compliance volume to physical volume (CV/PV), and (4) the air-leak resonance frequency. The outcome variable in this analysis was the absorbance change (Δabsorbance), which was calculated in eight frequency bands. The trends were similar for both the brass cavities and the ear canals. ΔAbsorbance generally increased with air-leak size and was largest for the lower frequency bands (0.1-0.2 and 0.2-0.5 kHz). Air-leak effects were observed in frequencies up to 10 kHz, but their effects above 1 kHz were unpredictable. These high-frequency air leaks were larger in brass cavities than in ear canals. Each of the four predictor variables exhibited consistent dependence on

  19. Tick in the outer ear canal: Two case reports

    Directory of Open Access Journals (Sweden)

    Özalkan Özkan

    2013-01-01

    Full Text Available Serious systemic diseases such as Crimean Congo Hemorrhagic Fever, Lyme Disease, tularemia, typhus and Q fever can be transmitted by ticks. An 8-year-old boy and a 34-year-old woman were brought to our clinic with ear pains. No symptoms such as fever, headache or lethargy to suggest CCHF were present. The patients both lived in rural areas and were engaged in farming. Full blood count, liver and kidney function tests and serum electrolytes were within normal limits at laboratory tests. Prothrombin time, partial thromboplastin time and INR were normal. The tick was grasped with alligator forceps and removed from the outer ear in one piece with the help of 0-degree rigid otoendoscopy.

  20. Congenital cholesteatoma of the middle ear - uncommon clinical presentation

    Directory of Open Access Journals (Sweden)

    Bukurov Bojana

    2014-01-01

    Full Text Available Introduction. Congenital cholesteatoma of the middle ear is un uncommon and yet not well-defined disease. Only few cases of cholesteatoma in the fossa ovalis with unusual clinical presentation have been reported in medical literature. Case report. We reported a 16-year-old girl with congenital cholesteatoma in the fossa ovalis with minimal clinical presentation. A small mass was found occluding the fossa ovalis and mimicking otosclerotic process within tympanic cavity. The operation started as stapedotomy, and when the process was confirmed it converted to mastoidectomy via the retroauricular approach. Conclusion. The diagnosis of congenital cholesteatoma in children should always be considered, even if the clinical symptoms imitate other ear disorders, in our case otosclerosis. [Projekat Ministarstva nauke Republike Srbije, br. 179055: Cochlear implantation impact on education of deaf and hearing-impaired