Base de dados : MEDLINE
Pesquisa : G13 [Categoria DeCS]
Referências encontradas : 8 [refinar]
Mostrando: 1 .. 8   no formato [Detalhado]

página 1 de 1

  1 / 8 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:26163583
[Au] Autor:Flynn PC; Kaufman WR
[Ad] Endereço:Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8 peter.flynn@ualberta.ca.
[Ti] Título:Mechanical properties of the cuticle of the tick Amblyomma hebraeum (Acari: Ixodidae).
[So] Source:J Exp Biol;218(Pt 17):2806-14, 2015 Sep.
[Is] ISSN:1477-9145
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Female ticks of the family Ixodidae increase their mass up to 100-fold during the 7-10 day feeding period. We determined the material properties of the alloscutal cuticle of female Amblyomma hebraeum from the time of moulting through to full engorgement. The material properties of the cuticle were evaluated by a Kelvin-Voigt analysis of compliance determined from the stretch of loops of cuticle under stress. There was a 3-fold increase in cuticle dry mass during the first 3 weeks post-moult, during which the ductility and stiffness of the cuticle increased substantially. Under stress, the cuticle displayed time-dependent stretch, with a plastic (non-recoverable) and viscoelastic (recoverable) component. Plastic deformation was reasonably constant in the range 10-15% over a wide range of induced stress above ∼ 0.6 MPa. The plastic component of tick alloscutal cuticle was about 5-10 times higher than that of unsclerotized insect cuticle. Tick cuticle is far more ductile than unsclerotized insect cuticle. Material properties of the cuticle did not change significantly as a function of cuticular water content over the normal range throughout the feeding cycle (13-37% wet mass). Injected dopamine (DA) reduced one measure of the viscosity of the cuticle by 38%. Plastic deformability of the cuticle was reduced by 70% after an in vitro stretch, but restored in fully engorged ticks, and in in vitro stretched loops by treatment with DA and reduced pH. Thinning of the cuticle by half during the rapid phase of engorgement requires plastic deformation (irreversible strain) in two orthogonal dimensions in excess of 40%. Treatment with DA increased plastic deformation and enabled extensibility (strain at the point of rupture) above 40%.
[Mh] Termos MeSH primário: Dopamina/farmacologia
Ixodidae/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Elasticidade
Comportamento Alimentar
Feminino
Concentração de Íons de Hidrogênio
Tegumento Comum/anatomia & histologia
Fenômenos Fisiológicos do Tegumento Comum
Ixodidae/efeitos dos fármacos
Ixodidae/fisiologia
Estresse Mecânico
Água
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
059QF0KO0R (Water); VTD58H1Z2X (Dopamine)
[Em] Mês de entrada:1607
[Cu] Atualização por classe:150903
[Lr] Data última revisão:
150903
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150712
[St] Status:MEDLINE
[do] DOI:10.1242/jeb.123919


  2 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:25975668
[Au] Autor:Retra K; deWalick S; Schmitz M; Yazdanbakhsh M; Tielens AG; Brouwers JF; van Hellemond JJ
[Ad] Endereço:Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands; Department of Parasitology, Leiden University Medical Center, Leiden, The Netherlands.
[Ti] Título:The tegumental surface membranes of Schistosoma mansoni are enriched in parasite-specific phospholipid species.
[So] Source:Int J Parasitol;45(9-10):629-36, 2015 Aug.
[Is] ISSN:1879-0135
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The complex surface structure of adult Schistosoma mansoni, the tegument, is essential for survival of the parasite. This tegument is syncytial and is covered by two closely-apposed lipid bilayers that form the interactive surface with the host. In order to identify parasite-specific phospholipids present in the tegument, the species compositions of the major glycerophospholipid classes, phosphatidylcholine, phosphatidylserine, phosphatidylethanolamine and phosphatidylinositol, including lysophospholipid species, were analysed in adult S. mansoni worms, isolated tegumental membranes and hamster blood cells. It was shown that there are large differences in species composition in all four phospholipid classes between the membranes of S. mansoni and those of the host blood cells. The species compositions of phosphatidylserine and phosphatidylcholine were strikingly different in the tegument compared with the whole worm. The tegumental membranes are especially enriched in lysophospholipids, predominantly eicosenoic acid (20:1)-containing lyso-phosphatidylserine and lyso-phosphatidylethanolamine species. Furthermore, the tegument was strongly enriched in phosphatidylcholine that contained 5-octadecenoic acid, an unusual fatty acid that is not present in the host. As we have shown previously that lysophospholipids from schistosomes affect the parasite-host interaction, excretion of these tegument-specific phospholipid species was examined in vitro and in vivo. Our experiments demonstrated that these lysophospholipids are not significantly secreted during in vitro incubations and are not detectable in peripheral blood of infected hosts. However, these analyses demonstrated a substantial decrease in PI content of blood plasma from schistosome-infected hamsters, which might indicate that schistosomes influence exosome formation by the host.
[Mh] Termos MeSH primário: Tegumento Comum
Fosfolipídeos/metabolismo
Schistosoma mansoni/metabolismo
Esquistossomose mansoni/metabolismo
[Mh] Termos MeSH secundário: Animais
Cricetinae
Fenômenos Fisiológicos do Tegumento Comum
Fosfolipídeos/química
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Phospholipids)
[Em] Mês de entrada:1603
[Cu] Atualização por classe:150630
[Lr] Data última revisão:
150630
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150516
[St] Status:MEDLINE


  3 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:24762236
[Au] Autor:Arnold P; Fischer MS; Nyakatura JA
[Ad] Endereço:Institut für Spezielle Zoologie und Evolutionsbiologie mit Phyletischem Museum, Friedrich-Schiller-Universität, Jena, Germany.
[Ti] Título:Soft tissue influence on ex vivo mobility in the hip of Iguana: comparison with in vivo movement and its bearing on joint motion of fossil sprawling tetrapods.
[So] Source:J Anat;225(1):31-41, 2014 Jul.
[Is] ISSN:1469-7580
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The reconstruction of a joint's maximum range of mobility (ROM) often is a first step when trying to understand the locomotion of fossil tetrapods. But previous studies suggest that the ROM of a joint is restricted by soft tissues surrounding the joint. To expand the limited informative value of ROM studies for the reconstruction of a fossil species' locomotor characteristics, it is moreover necessary to better understand the relationship of ex vivo ROM with the actual in vivo joint movement. To gain insight into the relationship between ex vivo mobility and in vivo movement, we systematically tested for the influence of soft tissues on joint ROM in the hip of the modern lizard Iguana iguana. Then, we compared the ex vivo mobility to in vivo kinematics of the hip joint in the same specimens using X-ray sequences of steady-state treadmill locomotion previously recorded. With stepwise removal of soft tissues and a repeated-measurement protocol, we show that soft tissues surrounding the hip joint considerably limit ROM, highlighting the problems when joint ROM is deduced from bare bones only. We found the integument to have the largest effect on the range of long-axis rotation, pro- and retraction. Importantly, during locomotion the iguana used only a fragment of the ROM that was measured in our least restrictive dissection situation (i.e. pelvis and femur only conjoined by ligaments), demonstrating the discrepancy between hip joint ROM and actual in vivo movement. Our study emphasizes the necessity for caution when attempting to reconstruct joint ROM or even locomotor kinematics from fossil bones only, as actual in vivo movement cannot be deduced directly from any condition of cadaver mobility in Iguana and likely in other tetrapods.
[Mh] Termos MeSH primário: Articulação do Quadril/fisiologia
Iguanas/fisiologia
Músculo Esquelético/fisiologia
Amplitude de Movimento Articular/fisiologia
Tendões/fisiologia
Caminhada/fisiologia
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos/fisiologia
Feminino
Fósseis
Fenômenos Fisiológicos do Tegumento Comum/fisiologia
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1502
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140426
[St] Status:MEDLINE
[do] DOI:10.1111/joa.12187


  4 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:23829213
[Au] Autor:Yamanaka M; Ishizaki Y; Nakagawa T; Taoka A; Fukumori Y
[Ad] Endereço:Division of Life Sciences, Graduate school of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
[Ti] Título:Purification and characterization of coacervate-forming cuticular proteins from Papilio xuthus pupae.
[So] Source:Zoolog Sci;30(7):534-42, 2013 Jul.
[Is] ISSN:0289-0003
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:The Papilio xuthus (Lepidoptera: Papilionidae) pupa expresses novel soluble proteins that undergo reversible temperature-dependent coacervate-formation. We purified two coacervate-forming proteins, PX-1 and PX-4, from the wings of pharate adults. PX-1 and PX-4 form coacervates upon warming. Transmission electron microscopy analysis revealed that these proteins assemble ordered bead-like ultrastructures. We cloned and sequenced PX-1 and PX-4 cDNAs. The PX-1 and PX-4 amino acid sequences contain many hydrophobic residues and show homologies to insect cuticular proteins. Moreover, when recombinant PX-1 and PX-4 were overexpressed in Escherichia coli, both recombinant proteins exhibited temperature-dependent coacervation. Furthermore, analyses of truncated mutants of PX-1 suggest that both the Val/Pro-rich region and Gly/lle-rich regions of PX-1 are involved in such coacervation.
[Mh] Termos MeSH primário: Borboletas/metabolismo
Regulação da Expressão Gênica/fisiologia
Proteínas de Insetos/metabolismo
Fenômenos Fisiológicos do Tegumento Comum
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Animais
Clonagem Molecular
Proteínas de Insetos/genética
Dados de Sequência Molecular
Mutação
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Insect Proteins)
[Em] Mês de entrada:1308
[Cu] Atualização por classe:130708
[Lr] Data última revisão:
130708
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130709
[St] Status:MEDLINE
[do] DOI:10.2108/zsj.30.534


  5 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
[PMID]:23599123
[Au] Autor:Scherfer C; Han VC; Wang Y; Anderson AE; Galko MJ
[Ad] Endereço:Department of Biochemistry and Molecular Biology, The University of Texas MD Anderson Cancer Center, Unit 1000, Houston, TX 77030, USA.
[Ti] Título:Autophagy drives epidermal deterioration in a Drosophila model of tissue aging.
[So] Source:Aging (Albany NY);5(4):276-87, 2013 Apr.
[Is] ISSN:1945-4589
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Organismal lifespan has been the primary readout in aging research. However, how longevity genes control tissue-specific aging remains an open question. To examine the crosstalk between longevity programs and specific tissues during aging, biomarkers of organ-specific aging are urgently needed. Since the earliest signs of aging occur in the skin, we sought to examine skin aging in a genetically tractable model. Here we introduce a Drosophila model of skin aging. The epidermis undergoes a dramatic morphological deterioration with age that includes membrane and nuclear loss. These changes were decelerated in a long-lived mutant and accelerated in a short-lived mutant. An increase in autophagy markers correlated with epidermal aging. Finally, the epidermis of Atg7 mutants retained younger characteristics, suggesting that autophagy is a critical driver of epidermal aging. This is surprising given that autophagy is generally viewed as protective during aging. Since Atg7 mutants are short-lived, the deceleration of epidermal aging in this mutant suggests that in the epidermis healthspan can be uncoupled from longevity. Because the aging readout we introduce here has an early onset and is easily visualized, genetic dissection using our model should identify other novel mechanisms by which lifespan genes feed into tissue-specific aging.
[Mh] Termos MeSH primário: Envelhecimento/fisiologia
Autofagia/fisiologia
Drosophila/fisiologia
Fenômenos Fisiológicos do Tegumento Comum
[Mh] Termos MeSH secundário: Animais
Proteína 7 Relacionada à Autofagia
Biomarcadores
Proteínas de Drosophila/genética
Proteínas de Drosophila/metabolismo
Regulação da Expressão Gênica/fisiologia
Mutação
Vertebrados/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, AMERICAN RECOVERY AND REINVESTMENT ACT; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Atg7 protein, Drosophila); 0 (Biomarkers); 0 (Drosophila Proteins); EC 6.2.1.45 (Autophagy-Related Protein 7)
[Em] Mês de entrada:1310
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130420
[St] Status:MEDLINE


  6 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:22766521
[Au] Autor:Klass KD; Matushkina NA
[Ad] Endereço:Senckenberg Natural History Collections Dresden, Museum of Zoology, Dresden, Germany. klaus.klass@senckenberg.de
[Ti] Título:The exoskeleton of the female genitalic region in Petrobiellus takunagae (Insecta: Archaeognatha): insect-wide terminology, homologies, and functional interpretations.
[So] Source:Arthropod Struct Dev;41(6):575-91, 2012 Nov.
[Is] ISSN:1873-5495
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The exoskeleton of the female genitalic region (abdominal venters 7-9) in Petrobiellus takunagae (Machilidae-Petrobiellinae) is studied using light microscopy and SEM. Sclerites are distinguished from membrane by the degree of cuticular flexibility. However, the microsculpture of the cuticle is shown to be useful in characterising the heterogeneity of the cuticle and in detecting weak sclerotisations. The morphology of Petrobiellus is compared with that in Trigoniophthalmus alternatus (Machilidae-Machilinae) described previously. While venter 7 is similar, venters 8 and 9 show many differences in the presence/absence or fusion/separation of particular sclerites. This suggests female genitalic morphology to be a valuable character system for phylogenetic and taxonomic work in Archaeognatha. Comparison with other insect orders is aimed at detecting homologous structures and conditions. Important points are: (1) Petrobiellus has a sclerotised genital lobe posteriorly on venter 7, similar to Zygentoma and Dictyoptera; it bears the gonopore. (2) Petrobiellus has a posterior sclerite on venter 9 that is very similar to a sclerite of Odonata. (3) The morphology of the coxal lobes of venter 9 (gonoplacs) suggests their function as a sheath of the ovipositor. From female genitalic morphology we deduce the process of oviposition, describing an external egg transportation tract.
[Mh] Termos MeSH primário: Insetos/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Feminino
Genitália Feminina/anatomia & histologia
Insetos/fisiologia
Tegumento Comum/anatomia & histologia
Fenômenos Fisiológicos do Tegumento Comum
Microscopia Eletrônica de Varredura
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1305
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:120707
[St] Status:MEDLINE


  7 / 8 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:22155007
[Au] Autor:Blahó M; Egri A; Hegedüs R; Jósvai J; Tóth M; Kertész K; Biró LP; Kriska G; Horváth G
[Ad] Endereço:Environmental Optics Laboratory, Department of Biological Physics, Physical Institute, Eötvös University, H-1117 Budapest, Pázmány sétány 1, Hungary.
[Ti] Título:No evidence for behavioral responses to circularly polarized light in four scarab beetle species with circularly polarizing exocuticle.
[So] Source:Physiol Behav;105(4):1067-75, 2012 Feb 28.
[Is] ISSN:1873-507X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The strongest known circular polarization of biotic origin is the left-circularly polarized (LCP) light reflected from the metallic shiny exocuticle of certain beetles of the family Scarabaeidae. This phenomenon has been discovered by Michelson in 1911. Although since 1955 it has been known that the human eye perceives a visual illusion when stimulated by circularly polarized (CP) light, it was discovered only recently that a stomatopod shrimp is able to perceive circular polarization. It is pertinent to suppose that scarab beetles reflecting LCP light in an optical environment (vegetation) being deficient in CP signals may also perceive circular polarization and use it to find each other (mate/conspecifics) as until now it has been believed. We tested this hypothesis in six choice experiments with several hundred individuals of four scarab species: Anomala dubia, Anomala vitis (Coleoptera, Scarabaeidae, Rutelinae), and Cetonia aurata, Potosia cuprea (Coleoptera, Scarabaeidae, Cetoniinae), all possessing left-circularly polarizing exocuticle. From the results of our experiments we conclude that the studied four scarab species are not attracted to CP light when feeding or looking for mate or conspecifics. We demonstrated that the light reflected by host plants of the investigated scarabs is circularly unpolarized. Our results finally solve a puzzle raised over one hundred years ago, when Michaelson discovered that scarab beetles reflect circularly polarized light.
[Mh] Termos MeSH primário: Comportamento de Escolha/fisiologia
Coleópteros/fisiologia
Fenômenos Fisiológicos do Tegumento Comum/fisiologia
Luz
Estimulação Luminosa/métodos
[Mh] Termos MeSH secundário: Animais
Percepção Visual/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1205
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:111214
[St] Status:MEDLINE
[do] DOI:10.1016/j.physbeh.2011.11.020


  8 / 8 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:19706276
[Au] Autor:Merrill RM; Jiggins CD
[Ad] Endereço:Department of Zoology, Downing Street, Cambridge CB2 3EJ, UK.
[Ti] Título:Müllerian mimicry: sharing the load reduces the legwork.
[So] Source:Curr Biol;19(16):R687-9, 2009 Aug 25.
[Is] ISSN:1879-0445
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Color pattern mimicry has long been held up as a powerful example of natural selection. A recent study supports the theory by describing Müllerian mimicry rings in Appalachian millipedes that are analogous to those observed in tropical butterflies.
[Mh] Termos MeSH primário: Adaptação Fisiológica
Artrópodes/fisiologia
Fenômenos Fisiológicos do Tegumento Comum
Modelos Biológicos
Seleção Genética
[Mh] Termos MeSH secundário: Animais
Anuros/anatomia & histologia
Anuros/fisiologia
Artrópodes/anatomia & histologia
Borboletas/anatomia & histologia
Borboletas/fisiologia
Cor
Meio Ambiente
Reconhecimento Visual de Modelos
Filogenia
Comportamento Predatório
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:0912
[Cu] Atualização por classe:090826
[Lr] Data última revisão:
090826
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:090827
[St] Status:MEDLINE
[do] DOI:10.1016/j.cub.2009.07.008



página 1 de 1
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde