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| Registros recuperados: 19 | |
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| Delbón,Natalia; Cosa,María Teresa; Dottori,Nilda; Stiefkens,Laura. |
| En el presente estudio se examinaron y compararon cuantitativamente las epidermis foliares de Flourensia campestris Griseb. y F. oolepis S. F. Blake, especies endémicas que crecen en las sierras de Córdoba, Argentina. Para ello, se seleccionaron cinco variables: número de células epidérmicas propiamente dichas, estomas, tricomas glandulares y eglandulares e índice estomático. Los resultados obtenidos se evaluaron por métodos estadísticos; ellos indican que hay diferencias significativas entre ambas especies en las variables frecuencia de estomas, de células propiamente dichas, de tricomas glandulares e índice estomático. Estos datos podrían ser de interés para su reconocimiento cuando se dispone de muestras pequeñas o fragmentos. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Flourensia; Epidermis; Análisis de varianza. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722007000200011 |
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| Ciciarelli,María De Las Mercedes; Passarelli,Lilian M; Rolleri,Cristina H. |
| Se llevó a cabo un estudio con microscopía de luz y electrónica de barrido (MEB) de los caracteres de la epidermis y de la ontogenia de los estomas en especies neotropicales de Canna (Cannaceae). Se estudiaron la presencia y tipos de indumento, el contorno foliar, los tipos de cera epicuticular, los modelos epidérmicos, el ordenamiento celular típico de epifilos e hipofilos, el espesor de la pared externa de las células epidérmicas y los caracteres de los estomas adultos paracíticos en ejemplares de C. ascendens, C. glauca, C. indica, C. lineata, C. paniculata, C. tandilensis y C. variegatifolia. Los caracteres se correlacionaron con el hábitat de las plantas. La ontogenia estomática se analizó en dos especies: C. coccinea y C. glauca; se encontraron... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canna; Cannaceae; Hábitat; Epidermis; Ceras; Estrías; Ontogenia de estomas. |
| Ano: 2017 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722017000100008 |
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| Souza,L. A.; Moscheta,I. S.; Oliveira,J. H. G.. |
| The genera and species of Piperaceae show a considerable structural diversity of leaves and especially stems. This paper presents a comparative morphological and anatomical study of the leaves and stems of three common Brazilian species of this family (Peperomia dahlstedtii C.DC., Ottonia martiana Miq. and Piper diospyrifolium Kunth), the vegetative organs of which have previously been little studied. The collected plant material was fixed in FAA, cut freehand and stained in safranin and astra blue. P. dahlstedtii is an epiphyte and has a herbaceous stem with whorled leaves phyllotaxis and a polystelic structure, a multiseriate adaxial leaf epidermis and calcium oxalate monocrystals in parenchyma and collenchyma petiole cells. O. martiana and P.... |
| Tipo: Journal article |
Palavras-chave: Crystal cells; Epidermis; Stele; Petiole. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100002 |
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| Tang, M.-S.; Yang, Y.-P.; Sheue, C.-R.. |
| A comparative anatomical study on the leaves of nine out of 29 species of the genus Daphniphyllum was performed to seek support for the present infrageneric classification. Daphniphyllum is composed of two sections, Lunata (with one subsection Lunata) and Daphniphyllum (with two subsections, Daphniphyllum and Staminodia). The glabrous leaves with brachyparacytic stomata appear in all species in this study; hemiparacytic, laterocytic or anomocytic stomata occur in some taxa. Two (out of three) species of section Lunata show irregular epidermal cells with undulate anticlinal walls on both surfaces and hemiparacytic stomata. Of section Daphniphyllum seven (out of 26) species were sampled; they have curved, straight or undulate anticlinal cell walls and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Daphniphyllaceae; Daphniphyllum; Epidermis; Leaf anatomy; Lunata; Stomata. |
| Ano: 2009 |
URL: http://www.repository.naturalis.nl/record/524761 |
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| Meruane,Manuel; Rojas,Mariana. |
| La Piel y sus estructuras asociadas permiten a los seres vivos subsistir en los diferentes ambientes ecológicos. El desarrollo de la piel y sus anexos en diferentes especies repite patrones comunes. De suma importancia es la interacción epitelio-mesénquima como regulador inicial de este desarrollo. El evento crucial en la formación de anexos, es la aparición de una placoda ectodérmica, a la cual se le asocia una condensación de células dérmicas, expresándose proteínas como Sonic Hedgehog (SHH) y la proteína morfogenética del hueso (BMP) para luego dar forma al anexo de cada especie. En esta revisión describiremos las etapas sucesivas que transcurren en la formación de la dermis, epidermis y anexos, con énfasis en las proteínas que dirigen el proceso. |
| Tipo: Journal article |
Palavras-chave: Piel; Dermis; Epidermis; Anexos. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400025 |
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| Fuentes Pérez, Mireya. |
| Se estudio la anatomía floral de 13 especies que representan a ocho clados de la subfamilia Opuntioideae K.Schum. (Cactaceae) y a Mahuienia de la subfamilia Maihuenioideae con el objetivo de describir y comparar su anatomía floral y reconocer posibles caracteres apomórficos que apoyen dichos clados. Dos o más botones florales se procesaron con la microtecnia convencional de inclusión en parafina. Entre los resultados más relevantes se observó que los tépalos externos presentan estomas, pero son raros en los internos. Maihueniopsis es el único género con haces vasculares de tipo anficribal en ambos tépalos. Las características anatómicas del pericarpelo son semejantes a las de los tallos vegetativos; interpretándose que los géneros que presentan... |
| Tipo: Tesis |
Palavras-chave: Anatomía floral; Opuntioideae; Epidermis; Estilo; Néctar; Lóbulo; Maestría; Botánica; Floral anatomy; Epiderm; Style; Nectar; Locules. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1280 |
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| Garro,M.L.; Barbeito,C.; Mario,R. C.; Galarza,B. C.; Cantera,C. S. |
| La industria curtidora genera una variedad de desechos potencialmente tóxicos que dependen del proceso de depilado utilizado. Para atenuar esta contaminación, se desarrollaron sistemas alternativos de depilado, entre ellos el enzimático. En la epidermis, a nivel del estrato corneo, se ubican lípidos que ocupan casi por completo el espacio intercelular entre los queratinocitos y desempeñan un importante papel como barrera hidrofóbica. Esta barrera debe transformarse para permitir el paso de las enzimas depilatorias hacia sus sitios de acción: folículo piloso/pelo y membrana basal. Las estructuras mencionadas deben eliminarse sin dañar el colágeno, proteína determinante de la calidad del cuero. Sobre trozos de piel bovina fueron analizados los efectos de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Enzimas depilatorias; Histología; Epidermis. |
| Ano: 2008 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1668-34982008000200005 |
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| Moreno-Gómez,Freddy; Duque,Tania; Fierro,Leonardo; Arango,Juan; Peckham,Xiomara; Asencio-Santofimio,Helberg. |
| The mechanisms to obtain and store skin toxins in frogs in of the family Dendrobatidae are not completely understood. In order to contribute to understand how toxins are stored, we provide a histological description of the cutaneous glands of the species Phyllobates bicolor. The skin of two adult frogs was examined through three histological staining techniques (hematoxilin-eosin, PAS and Masson Trichrome) using conventional optic microscopy. The skin of Phyllobates bicolor contains two types of exocrine glands: mucous and serous, which empty their products to the epidermal surface through an intra-epithelial duct that leads to a stoma. The mucous and serous glands and the intercalated ducts are surrounded by a discontinuous sheath of myoepithelial cells,... |
| Tipo: Journal article |
Palavras-chave: Amphibians; Phyllobates bicolor; Integument; Epidermis; Dermis; Mucous glands; Serous glands; Chemical defenses; Bioaccumulation. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300022 |
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| Yagueddú,Cristina; Comparatore,Viviana; Paoletti,Gilda. |
| The microhistological analysis quantifies the botanical composition of herbivore diets by the identification of the epidermal characters of ingested species. Many Papilionaceae form part of herbivore diets due to their high nutritive quality. Different species of this family are sometimes grouped together due to the difficulty to recognize them. In this study, the epidermis of Lotus tenuis, Medicago arabica, Medicago lupulina, Melilotus albus, Trifolium pratense and Trifolium repens was analysed. Also, it was tested if such descriptions could be useful to identify fragments of these species in hand-composed mixtures and then quantified by microanalysis. Descriptions and drawings are presented. Regressions were significant (p<0.05) for Lotus tenuis,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Epidermis; Microhistological analysis; Herbivore diet; Fabaceae; Leguminosae; Lotus; Medicago; Melilotus; Trifolium. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722009000200007 |
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| REIS,L.A.C.; CARVALHO,F.P.; FRANÇA,A.C.; FRANCINO,D.M.T.; PINTO,N.A.V.D.; FREITAS,A.F.. |
| ABSTRACT: The most widely used herbicide in coffee crop is glyphosate, it inhibits the biosynthesis of secondary metabolites, responsible for structures and substances of plant defense. This work aimed to evaluate the morphoanatomy, total phenols, flavonoids and caffeine in leaves of Arabica coffee submitted to different sub-doses of glyphosate. The treatments were combinations of three coffee cultivars (MGS Travessia, Oeiras MG 6851 and Catuaí IAC 144) and five sub-doses of glyphosate (0.0, 57.6, 115.2, 230.4 and 460.8 g a.e. ha-1). The total thickness of the leaf blade, thickness of adaxial and abaxial epidermis, palisade and spongy parenchyma, in addition to the total phenol, total flavonoids and caffeine were evaluated 30 days after spraying. Catuaí... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide drift; Coffea arabica; Epidermis; Parenchyma; Caffeine; Flavonoid. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100336 |
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| Lajús,Cristiano Reschke; Miranda,Mário; Basso,Simone Meredith Scheffer; Carneiro,Cercí Maria; Escosteguy,Pedro Alexandre Varella. |
| This study aimed to evaluate the chemical and anatomical attributes of leaves of giant missionary grass to application of 0, 62, 124, 186, 248 and 310m³ ha-1 of pig slurry. At 83 days after the last application of fertilizer, the leaf blades were collected, fixed in FAA 70%, sectioned, stained, photographed and digitalized. The transversal section of leaf blades were evaluated for proportion of epidermis, lignified vascular tissue + sclerenchyma, non-lignified vascular tissue and parenchyma with an image-processing system calibrated to 1mm pixel-1. Leaf samples were analyzed for crude protein, acid detergent fiber, neutral detergent fiber and hemicellulose content by near infrared reflectance spectroscopy. The pig slurry application up to 310m³ ha-1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crude protein; Epidermis; Fiber; Lignified vascular tissue + sclerenchyma; Parenchyma. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000200013 |
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| Alper,M.; Kavak,A.; Parlak,A.H.; Demirci,R.; Belenli,I.; Yesildal,N.. |
| The aim of the present study was to measure full epidermal thickness, stratum corneum thickness, rete length, dermal papilla widening and suprapapillary epidermal thickness in psoriasis patients using a light microscope and computer-supported image analysis. The data obtained were analyzed in terms of patient age, type of psoriasis, total body surface area involvement, scalp and nail involvement, duration of psoriasis, and family history of the disease. The study was conducted on 64 patients and 57 controls whose skin biopsies were examined by light microscopy. The acquired microscopic images were transferred to a computer and measurements were made using image analysis. The skin biopsies, taken from different body areas, were examined for different... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psoriasis; Epidermis; Thickness; Computer-supported image analysis. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000100015 |
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| Lavalle,María del Carmen; Prada,Carmen. |
| Se revisó la morfología del esporófito y se estudió por primera vez el desarrollo y la morfología del gametófito de Asplenium dareoides, a partir de esporas cultivadas en un medio nutritivo solidificado con agar. Las esporas germinaron a partir de los 10 días en un porcentaje muy bajo (1 al 5%). La fase filamentosa se inició a los 15 días. Los gametófitos siguieron un modelo de desarrollo de tipo Aspidium, y en la madurez presentaron pelos marginales y superficiales, cilíndricos y algo ensanchados en el ápice. El estudio morfológico del esporófito se basó en la arquitectura foliar, el indumento, el modelo epidérmico de las pínnulas y de los indusios, y en la morfología y el tamaño de las esporas (longitud media de 28,9 a 39,7 µm). El estudio de la meiosis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asplenium; Epidermis; Esporas; Desarrollo; Gametófito; Sudamérica. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932007000100002 |
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| MA,CHANG M. |
| In higher vertebrates, from amphibians to humans, epidemial maturation is a conserved developmental process. Using adult epidemial tissue and an established keratinocyte cell line, the mouse Nkx-2.3 homeobox gene was demonstrated, for the first time, to be expressed in mouse epidermal keratinocytes. Under the normal culture condition, the spontaneous aggregation phenomenon, a common initiation step of ES cell differentiation, and the induction of mouse adult K1 keratin, a marker of mature epidermal keratinocytes, were both observed in vitro when the Xenopus Nkx-2.3 gene was stably transfected into a mouse pluripotent P19 EC cell line. The induction of mouse K1 keratin by using its Xenopus orthologous gene in the mouse P19 cell implies that Nkx-2.3 may play... |
| Tipo: Journal article |
Palavras-chave: Nkx-2.3; Epidermis; Homeobox gene; Skin maturation; Differentiation. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300001 |
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| Forni,Maria F; Trombetta-Lima,Marina; Sogayar,Mari C. |
| The skin is a complex stratified organ which acts not only as a permeability barrier and defense against external agents, but also has essential thermoregulatory, sensory and metabolic functions. Due to its high versatility and activity, the skin undergoes continuous self-renewal to repair damaged tissue and replace old cells. Consequently, the skin is a reservoir for adult stem cells of different embryonic origins. Skin stem cell populations reside in the adult hair follicle, sebaceous gland, dermis and epidermis. However, the origin of most of the stem cell populations found in the adult epidermis is still unknown. Far more unknown is the embryonic origin of other stem cells that populate the other layers of this tissue. In this review we attempt to... |
| Tipo: Journal article |
Palavras-chave: Skin development; Embryonic skin; Epidermis; Dermis; Sebaceous Gland; Hair follicle. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000300003 |
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| Registros recuperados: 19 | |
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