BIOS Instant Notes in Animal Biology

Jurd, Richard D.

doi:10.1201/9780203427545

Cited by 3 publications

(9 citation statements)

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“…610, 632;Mathews, 1986, pp. 24-5, 30-1;Gilbert & Raunio, 1997;Jurd, 2004;Lee, 2008, pp. 192, 214, 217;Nielsen, 2012;Leadbeater, 2015, p. 61).…”

Section: C Cell Division: Palintomyunclassified

“…The palintomy that is observed in Appendisphaera grandis, Mengeosphaera bellula and Tianzhushania spinosa is evident in cysts of the same size that contain one or four to multiple, and in Tianzhushania thousands of, identical cells (Figs 2a-c and 3a, b, e, f). Palintomic division is observed during sporogenesis in algae as well as in protistan holozoans and metazoans (Margulis et al 1989;Van den Hoek et al 1995;Jurd, 2004;Butterfield, 2011;Huldtgren et al 2011). However, in algae and protistan holozoans, this process leads to formation of morphologically identical offspring cells (which may be very numerous; Margulis et al 1989;Van den Hoek et al 1995;Lee et al 2000;Graham et al 2009;Leadbeater, 2015).…”

Section: C Cell Division: Palintomymentioning

confidence: 99%

“…In progressing cell divisions, the cells are differentiated in shape and size, oriented into poles, asymmetrically segregated and aligned and grow into tissues. In animal embryos, cell differentiation, their orientation and polarization begin from the stage of 16 cells and after the third round of cell divisions (Anderson, 1973;Kessel & Shih, 1974;Mathews, 1986;Gilbert & Raunio, 1997;Jurd, 2004;Gilbert, 2010;Nielsen, 2012;Shilo, 2014;Gross et al 2015). Even in tardigrades, which may not have obvious blastocoel and in which the sterroblastula is a ball of cells, the cells are differentiated in shape (Gross et al 2015;Levin et al 2016).…”

Section: C Cell Division: Palintomymentioning

confidence: 99%

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Ediacaran algal cysts from the Doushantuo Formation, South China

Moczydłowska

2021

Geol. Mag.

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Early-middle Ediacaran organic-walled microfossils from the Doushantuo Formation studied in several sections in the Yangtze Gorges area, South China, show ornamented cyst-like vesicles of very high diversity. These microfossils are diagenetically permineralized and observed in petrographic thin-sections of chert nodules. Exquisitely preserved specimens belonging to seven species of Appendisphaera, Mengeosphaera, Tanarium, Urasphaera and Tianzhushania contain either single or multiple spheroidal internal bodies inside the vesicles. These structures indicate reproductive stages, endocyst and dividing cells, respectively, and are preserved at early to late ontogenetic stages in the same taxa. This new evidence supports the algal affiliations for the studied taxa and refutes previous suggestions of Tianzhushania being animal embryo or holozoan. The first record of a late developmental stage of a completely preserved specimen of T. spinosa observed in thin-section demonstrates the interior of vesicles with clusters of identical cells but without any cavity that is diagnostic for recognizing algal cysts vs animal diapause cysts. Various lines of evidence to infer biological affinities of these microfossils – morphology, reproductive characters, spatial arrangement of cells, and biochemical properties of the vesicle wall – are collectively characteristic of algal clades. Recognizing the biological affinities of these microfossils is key to understanding whether animals capable of producing such morphologically complex diapause cysts had an early Ediacaran fossil record (633–610 Ma), or the microfossils were non-animal holozoans or algae as argued herein for Tianzhushania spinosa and other studied microfossils.

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“…610, 632;Mathews, 1986, pp. 24-5, 30-1;Gilbert & Raunio, 1997;Jurd, 2004;Lee, 2008, pp. 192, 214, 217;Nielsen, 2012;Leadbeater, 2015, p. 61).…”

Section: C Cell Division: Palintomyunclassified

Section: C Cell Division: Palintomymentioning

confidence: 99%

Section: C Cell Division: Palintomymentioning

confidence: 99%

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Ediacaran algal cysts from the Doushantuo Formation, South China

Moczydłowska

2021

Geol. Mag.

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“…The survival of fish species in a particular environment is dependent on the body's ability to cope with environmental salinity at different stages of life (Varsamos et al 2002). Osmoregulation is a process that controls electrolyte concentrations and dissolved organic substances in body fluids and maintains the balance of salt and water (Jurd 2000). Gills are the most important osmoregulatory organs in euryhaline teleost fishes, and the gill epithelium is essential for the uptake and excretion of salt in fresh water and salt water, respectively (Evans et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Cytological comparison of gill chloride cells and blood serum ion concentrations in kutum (Rutilus frisii kutum) spawners from brackish (Caspian Sea) and fresh water (Khoshkrood River) environments

Ghahremanzadeh

Namin

Bani

et al. 2014

Archives of Polish Fisheries

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The size and number of chloride cells and serum ion concentrations in kutum, Rutillus frisii kutum Nordman, from brackish (Caspian Sea) and fresh water (Khoshkrood River) environments were studied to gain a better understanding of osmoregulation in this species. Twenty mature kutum specimens were collected from the Caspian Sea (Anzali coasts, 8.49 ppt salinity and 12.4°C temperature) and 20 specimens from Khoshkrood River (0.18 ppt salinity and 18°C temperature). Gill samples were analyzed histologically and concentrations of Na+, Cl- , K+, and Mg2+ ions were determined in the blood serum. Concentrations of Na+, Cl- , K+, and Mg2+ ions and osmotic pressure in mature kutum from brackish water were significantly higher than in specimens from fresh water. The average size and number of chloride cells in the fish from seawater were considerably larger than those from fresh water. The mean size of chloride cells was 6.89 ± 1.16 μm in brackish water samples and 5.1 ± 0.81 μm in river samples. The average number of chloride cells in brackish and river water samples were 16.92 and 6.57, respectively. The density and size of chloride cells increased with increases in salinity

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“…Estudo realizado com Hirundo rustica mostrou que a AF encontrada nas penas da cauda é negativamente correlacionada com o sucesso de acasalamento (Rasmuson 2002). A AF em asas de aves exerce um papel importante sobre o desempenho aerodinâmico do vôo (Jurd 2004). Espécies de aves que despendem maior tempo em vôo podem apresentar asas mais assimétricas que outras, demonstrando a dependência da AF com o hábito e a importância funcional do caracter para a ave (Balmford et al 1993).…”

Section: Capítulounclassified

Aves como biomonitoras da qualidade ambiental em fragmentos florestais do cerrado

Baesse¹

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Com mais uma etapa concluída da minha vida, tenho muito a agradecer a todas as pessoas que estiveram ao meu lado, com o apoio de vocês consegui finalizar este trabalho. Primeiramente, agradeço a Deus porque sem ele nada disso seria possível.Aos familiares, pelo apoio e carinho em todas as horas. Especialmente aos meus pais, José Ricardo e Tânia, e à minha irmã, Isadora, agradeço por acreditarem e confiarem no meu potencial, por terem me apoiado sempre e por fazer minha vida tão feliz. Amo vocês! Ao meu namorado Vitor, que me ajudou e ajuda em todos os momentos, você foi fundamental no desenvolvimento desta dissertação. Muito obrigada por me completar, você é essencial na minha vida. Amo você! À Profa. Dra. Celine de Melo, pela orientação, por todo o ensinamento que me foi passado, agradeço acima de tudo pela amizade, paciência e confiança. Muito obrigada por ser uma das maiores responsáveis pelo meu amadurecimento e crescimento profissional.Agradeço aos amigos que conquistei durante a graduação e mestrado e, especialmente, àqueles que sempre estiveram ao meu lado.A todos do GEECA, pelos ensinamentos, viagens, reuniões e muita diversão. Em especial, à equipe fixa de anilhamento pela ajuda no intenso esforço de campo e também por transformar os campos em dias agradáveis com muitas risadas. À FAPEMIG, pela bolsa concedida e ao Programa de Pós-Graduação em Ecologia e Conservação dos Recursos Naturais da Universidade Federal de Uberlândia pelo apoio financeiro, FAPEMIG (APQ 01654/12)pelo financiamento deste projeto.Aos professores e funcionários do Programa, em especial à Maria Angélica pela dedicação e paciência. Ao Prof. Dr. Júlio César Nepomuceno, pelo suporte na identificação inicial dos micronúcleos; à Profa. Dra. Rute M. Brito e à doutoranda Luana Pereira dos Santos pela ajuda e disponibilização do laboratório de citogenética. À banca examinadora, Profa. Dra. Luciana Vieira de Paiva, Profa. Dra. Sandra Morelli e o Prof. Dr. Júlio César Nepomuceno, pelas contribuições que certamente enriquecerão este trabalho.

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BIOS Instant Notes in Animal Biology

Cited by 3 publications

References 0 publications

Ediacaran algal cysts from the Doushantuo Formation, South China

Ediacaran algal cysts from the Doushantuo Formation, South China

Cytological comparison of gill chloride cells and blood serum ion concentrations in kutum (Rutilus frisii kutum) spawners from brackish (Caspian Sea) and fresh water (Khoshkrood River) environments

Aves como biomonitoras da qualidade ambiental em fragmentos florestais do cerrado

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