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Journal articles on the topic 'Velamen structure'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Mr., Sabu V.U, and Raji R. Dr. "Anatomical Insights into Orchid Roots: Adaptive Mechanisms in Polystachya concreta, Liparis viridiflora, & Coelogyne nervosa." International Journal of Environmental and Agriculture Research 10, no. 12 (2024): 06–11. https://doi.org/10.5281/zenodo.14575031.

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<strong>Abstract:</strong> Orchids exhibit remarkable anatomical adaptations in their roots, enabling them to thrive in diverse ecological conditions. This study investigates the root anatomical features of three orchid species: Polystachya concreta, Liparis viridiflora, and Coelogyne nervosa. Specimens were collected from the Eunoia Orchid Garden, Ambalavayal, and analyzed using histological techniques. Observations revealed significant variations in root structures, including velamen layers, cortical organization, vascular bundle arrangements, and pith characteristics. Polystachya concreta e

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Roth-Nebelsick, Anita, Mike Thiv, Yaron Malkowsky, Rena Schott, and Arnd Heyer. "Structure and functional anatomy of the gas exchange apparatus of leafless orchids: evidence for a control mechanism?" Botanical Journal of the Linnean Society 197, no. 2 (2021): 249–62. http://dx.doi.org/10.1093/botlinnean/boab021.

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Abstract It is assumed that special structures in aerial roots of leafless orchids, aeration units, are involved in gas exchange regulation. In this study, the structure of aeration units in three leafless taxa (Microcoelia exilis, M. aphylla, Dendrophylax funalis) and a leaf-bearing species (Campylocentrum micranthum) are investigated to obtain more evidence of a possible mechanism for gas exchange control in aerial orchid roots. Extensive analyses of the anatomy of the velamen radicum, exodermis and cortex were performed using light and electron microscopy and µCT. In all considered leafless

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3

Joca, Thais Arruda Costa, Denis Coelho de Oliveira, Gerhard Zotz, Uwe Winkler, and Ana Silvia Franco Pinheiro Moreira. "The velamen of epiphytic orchids: Variation in structure and correlations with nutrient absorption." Flora 230 (May 2017): 66–74. http://dx.doi.org/10.1016/j.flora.2017.03.009.

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Pedroso-de-Moraes, Cristiano, Thiago de Souza-Leal, Rafael L. Brescansin, Adarilda Pettini-Benelli, and Maria das Graças Sajo. "Radicular anatomy of twelve representatives of the Catasetinae subtribe (Orchidaceae: Cymbidieae)." Anais da Academia Brasileira de Ciências 84, no. 2 (2012): 455–68. http://dx.doi.org/10.1590/s0001-37652012005000028.

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Considering that the root structure of the Brazilian genera belonging to the Catasetinae subtribe is poorly known, we describe the roots of twelve representatives from this subtribe. For anatomical analysis, the roots were fixed in FAA 50, preserved in ethanol 70% and sectioned at its medium region using razor blades. The sections were stained with 0.05% astra blue and safranin and mounted in glycerin. For the identification of starch we used Lugol's solution; for lignin, floroglucin chloridric; for lipids, Sudan III, and for flavanoids, potassium hydroxide. The relevant aspects were registere

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Carvalho, José L., Adriana H. Hayashi, Shoey Kanashiro, and Armando R. Tavares. "Anatomy and function of the root system of bromeliad Nidularium minutum." Australian Journal of Botany 65, no. 7 (2017): 550. http://dx.doi.org/10.1071/bt17121.

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The root anatomy of bromeliad Nidularium minutum Mez was studied and the efficiency of root system in contributing to the growth, development and mineral uptake of the species evaluated. To accomplish this analysis, four treatments were applied as follows: (i) control plants with 5 mL H2O on substrate and 5 mL H2O into tank; (ii) plants supplied with nutrients to the tank with 5 mL H2O on substrate and 5 mL Hoagland and Arnon solution into tank; (iii) plants supplied with nutrients to the roots with 5 mL HA on substrate and 5 mL H2O into tank; and (iv) plants supplied with nutrients to the tan

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Joca, Thais Arruda Costa, Denis Coelho de Oliveira, Gerhard Zotz, Uwe Winkler, and Ana Silvia Franco Pinheiro Moreira. "Corrigendum to “The velamen of epiphytic orchids: Variation in structure and correlations with nutrient absorption” [Flora 230 (2017) 66–74]." Flora 235 (October 2017): 92–93. http://dx.doi.org/10.1016/j.flora.2017.08.008.

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7

Mukhtubayeva, S., A. Khalymbetova, A. Myrzagaliyeva, S. Kubentayev, M. Zhumagul, and S. Abiyev. "Study of anatomical structure of Dactylorhiza fuchsii (Orchidaceae) growing in the Karkaraly Mountains (Central Kazakhstan)." Fundamental and Experimental Biology 11830, no. 2 (2025): 127–35. https://doi.org/10.31489/2025feb2/127-135.

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The study of plant structure peculiarities plays an important role in understanding the ecology and habitat conditions of species, as well as for the identification of characteristic features in confirming the species identity of plant raw materials. This article presented the results of microscopic structure of above-ground and underground organs of Dactylorhiza fuchsii growing in the Karkaraly Mountains (Central Kazakhstan). The results showed that the leaf preparation is characterized by the presence of polygonal epidermal cells, stomata of tetracytic type, predominantly localized on the lo

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Oliveira, Rafael S., Todd E. Dawson, and Stephen S. O. Burgess. "Evidence for direct water absorption by the shoot of the desiccation-tolerant plant Vellozia flavicans in the savannas of central Brazil." Journal of Tropical Ecology 21, no. 5 (2005): 585–88. http://dx.doi.org/10.1017/s0266467405002658.

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Our common view on water uptake by terrestrial plants is that it occurs via absorption by roots from the soil substrate. However, it has long been known that plants exhibit alternative water-absorption strategies, particularly in drought-prone environments. Examples include many tropical epiphytic orchids which use a specialized structure called velamen radicum around their aerial roots for moisture absorption directly from the air (Capesius & Barthlott 1975), specialized trichomes in bromeliads (Andrade 2003, Benzing 1990), uptake by hydathodes into leaves of species inhabiting dry desert

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9

Castillo-Pérez, Luis J., Juan J. Maldonado-Miranda, Ángel J. Alonso-Castro, and Candy Carranza-Álvarez. "Efecto de 6-bencilaminopurina y nitrato de potasio sobre la micropropagación in vitro de Laelia anceps subsp. anceps (Orchidaceae)//Effect of 6-benzylaminopurine and potassium nitrate on the in vitro micropropagation of Laelia anceps subsp. anceps (Orchidaceae)." Biotecnia 22, no. 1 (2019): 32–38. http://dx.doi.org/10.18633/biotecnia.v22i1.1122.

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Laelia anceps subsp. anceps es una especie de la familia Orchidaceae que presenta altas tasas de extracción y comercio ilegal en diversos estados de la República Mexicana, además requiere de condiciones nutricionales específicas debido a sus características de desarrollo y distribución. Por lo cual, el objetivo de la presente investigación fue establecer un protocolo de micropropagación in vitro comparando el efecto de la citocinina 6-bencilaminopurina (BAP) y el nitrato de potasio (KNO3). Para ello, se cultivaron semillas estériles en medio MS sin reguladores de crecimiento vegetal. Posterior

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Santos, Igor Soares dos, and Marcos José da Silva. "Anatomy and Histochemistry of the Vegetative System of Brachystele guayanensis (Lindl.) Schltr. (Orchidaceae), a Potential Medicinal Species." Plants 12, no. 14 (2023): 2635. http://dx.doi.org/10.3390/plants12142635.

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The orchid genus Brachystele Schltr. (Orchidoideae, Cranichideae, Spiranthinae) comprises 20 species distributed from Mexico to Argentina, with 10 species found in Brazil. Anatomical studies of Orchidoideae Lindl. have been scarce, and the anatomy and histochemistry of Brachystele are still largely unknown. In this study, we conducted a characterization of the vegetative organs of B. guayanensis (Lindl.) Schltr. using standard anatomical and histochemical microtechniques. In this study, we provide the first information about the anatomy and histochemistry of Brachystele. The studied species wa

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Mr., Sabu V.U. "Exploring Orchid Nutrition: Fungal Associations, Atmospheric Absorption, and Root Western Ghats in Wayanad, India." International Journal of Environmental & Agriculture Research (IJOEAR) 11, no. 1 (2025): 70–73. https://doi.org/10.5281/zenodo.14807545.

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<strong>Abstract</strong><strong>—</strong> Orchids (Orchidaceae) are a diverse plant family known for their unique nutritional adaptations, allowing them to thrive in a variety of ecosystems. This five-year study explores the intricate nutrient acquisition strategies of orchids in the Western Ghats, particularly in the Wayanad region, a biodiversity hotspot with a rich diversity of epiphytic and terrestrial orchid species. The research investigates five primary nutritional pathways: mycorrhizal symbiosis, atmospheric nutrient absorption, rainwater uptake, organic matter decomposition, a

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12

CHITLARU, Theodor, Chanoch KRONMAN, Baruch VELAN, and Avigdor SHAFFERMAN. "Overloading and removal of N-glycosylation targets on human acetylcholinesterase: effects on glycan composition and circulatory residence time." Biochemical Journal 363, no. 3 (2002): 619–31. http://dx.doi.org/10.1042/bj3630619.

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Optimization of post-translational modifications was shown to affect the ability of recombinant human acetylcholinesterase (rHuAChE) produced in HEK-293 cells to be retained in the circulation for prolonged periods of time [Kronman, Velan, Marcus, Ordentlich, Reuveny and Shafferman (1995) Biochem. J. 311, 959–967; Chitlaru, Kronman, Zeevi, Kam, Harel, Ordentlich, Velan and Shafferman (1998) Biochem. J. 336, 647–658; Chitlaru, Kronman, Velan and Shafferman (2001) Biochem. J. 354, 613–625]. To evaluate the possible contribution of the number of appended N-glycans in determining the pharmacokinet

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13

Sancassiani, Federica, Alessio Cocco, Giulia Cossu, et al. "“VelaMente?!” - Sailin in a Crew to Improve Self-Efficacy in People with Psychosocial Disabilities: A Randomized Controlled Trial." Clinical Practice & Epidemiology in Mental Health 13, no. 1 (2017): 200–212. http://dx.doi.org/10.2174/1745017901713010200.

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Introduction:It has been proposed that sailing can improve quality of life, personal and social skills of people with severe psychosocial disabilities. This study aimed to assess the efficacy of a psychosocial rehabilitative intervention focused on sailing on quality of life, self-efficacy and sense of coherence in people with severe psychosocial disabilities.Methods:The study was a randomized, with parallel groups, waiting-list controlled trial. Participants were 51 people with severe psychosocial disabilities. The intervention was a structured course to learn sailing in a crew lasting three

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14

COHEN, Ofer, Chanoch KRONMAN, Baruch VELAN, and Avigdor SHAFFERMAN. "Amino acid domains control the circulatory residence time of primate acetylcholinesterases in rhesus macaques (Macaca mulatta)." Biochemical Journal 378, no. 1 (2004): 117–28. http://dx.doi.org/10.1042/bj20031305.

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An array of 13 biochemically well defined molecular forms of bovine, human and newly cloned rhesus macaque (Macaca mulatta) AChEs (acetylcholinesterases) differing in glycosylation and subunit assembly status were subjected to comparative pharmacokinetic studies in mice and rhesus macaques. The circulatory lifetimes of recombinant bovine, macaque and human AChEs in mice were governed by previously determined hierarchical rules; the longest circulatory residence time was obtained when AChE was fully sialylated and tetramerized [Kronman, Chitlaru, Elhanany, Velan and Shafferman (2000) J. Biol. C

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15

MENDELSON, Itai, Chanoch KRONMAN, Naomi ARIEL, Avigdor SHAFFERMAN, and Baruch VELAN. "Bovine acetylcholinesterase: cloning, expression and characterization." Biochemical Journal 334, no. 1 (1998): 251–59. http://dx.doi.org/10.1042/bj3340251.

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The bovine acetylcholinesterase (BoAChE) gene was cloned from genomic DNA and its structure was determined. Five exons coding for the AChE T-subunit and the alternative H-subunit were identified and their organization suggests high conservation of structure in mammalian AChE genes. The deduced amino acid sequence of the bovine T-subunit is highly similar to the human sequence, showing differences at 34 positions only. However, the cloned BoAChE sequence differs from the published amino acid sequence of AChE isolated from fetal bovine serum (FBS) by: (1) 13 amino acids, 12 of which are conserve

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16

ப., பாலமுருகன் /. P. Balamurugan. "பதினெண் கீழ்க்கணக்கு அக நூல்களில் தமிழர் கலாச்சாரம் / Tamil Culture in the Pathinen Keelkanakku Agam Books". IJTLLS 7, SPL 1 (2024): 291–301. https://doi.org/10.5281/zenodo.15129652.

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<em>India is the only country in the world that continues to uphold its cultural heritage and traditions from the past to this day. This is why the world admires India due to its rich cultural roots. Among the Indian states, the people of the Tamil region have excelled in preserving and practising their cultural traditions. A major factor contributing to this cultural continuity is Tamil literature. Sangam Tamil poets created literary works that introduced the world to Tamil culture and values. Sangam texts provide a vivid portrayal of the lives, customs and traditions of the ancient Tamil peo

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17

Hauber, Frank, Wilfried Konrad, and Anita Roth-Nebelsick. "Aerial roots of orchids: the velamen radicum as a porous material for efficient imbibition of water." Applied Physics A 126, no. 11 (2020). http://dx.doi.org/10.1007/s00339-020-04047-7.

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AbstractAerial roots of orchids are able to absorb atmospheric water (e.g. rain, mist, dew) and to conduct it to the root interior. The water is absorbed by imbibition into a biological porous material, the velamen radicum, which envelops the aerial root and comprises one or two to several layers. The velamen radicum consists of walls of dead cells and shows an intricate structure. In this contribution, the imbibition process was studied in more detail using mathematical principles and by experimental observation of eight orchid species. The process of absorption can be subdivided into two sta

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18

Tian, Jili, Weiwei Jiang, Jinping Si, Zhigang Han, Cong Li, and Donghong Chen. "Developmental Characteristics and Auxin Response of Epiphytic Root in Dendrobium catenatum." Frontiers in Plant Science 13 (June 23, 2022). http://dx.doi.org/10.3389/fpls.2022.935540.

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Dendrobium catenatum, a traditional precious Chinese herbal medicine, belongs to epiphytic orchids. Its special life mode leads to the specialization of roots, but there is a lack of systematic research. The aerial root in D. catenatum displays diverse unique biological characteristics, and it initially originates from the opposite pole of the shoot meristem within the protocorm. The root development of D. catenatum is not only regulated by internal cues but also adjusts accordingly with the change in growth environments. D. catenatum root is highly tolerant to auxin, which may be closely rela

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19

Tay, Jessica Y. L., Gerhard Zotz, Stanislav N. Gorb, and Helena J. R. Einzmann. "Getting a Grip on the Adhesion Mechanism of Epiphytic Orchids – Evidence From Histology and Cryo-Scanning Electron Microscopy." Frontiers in Forests and Global Change 4 (November 10, 2021). http://dx.doi.org/10.3389/ffgc.2021.764357.

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Plants and animals evolve different attachment structures and strategies for reversible or permanent adhesion to different substrate types. For vascular epiphytes, having the ability to permanently attach to their host plants is essential for establishment and survival. Unlike mistletoe roots, roots of vascular epiphytes do not penetrate the host tissues but instead achieve attachment by growing in close contact to the surface of the substrate. However, the fundamental understanding of the attachment functions of epiphytic roots remains scarce, where majority of studies focused on the general

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20

Cantó-Pastor, Alex, Concepcion Manzano, and Siobhán M. Brady. "A Way to Interact with the World: Complex and Diverse Spatiotemporal Cell Wall Thickenings in Plant Roots." Annual Review of Plant Biology, January 2, 2025. https://doi.org/10.1146/annurev-arplant-102820-112451.

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Plant cells are defined by their walls, which, in addition to providing structural support and shape, are an integral component of the nonliving extracellular space called the apoplast. Cell wall thickenings are present in many different root cell types. They come in a variety of simple and more complex structures with varying composition of lignin and suberin and can change in response to environmental stressors. The majority of these root cell wall thickenings and cell types that contain them are absent in the model plant Arabidopsis thaliana despite being present in most plant species. As a

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21

De Bock, Katrijn, Hans Jacquemyn, Nhora H. Ospina-Calderón, Nicola S. Flanagan, and Agustina Ventre-Lespiaucq. "Variation in root functional traits of Neotropical epiphytic and terrestrial orchids along an elevational gradient." Botanical Journal of the Linnean Society, July 13, 2024. http://dx.doi.org/10.1093/botlinnean/boae040.

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Abstract Assessing variation in root functional traits may offer novel insights into plant adaptations to changing environmental conditions. However, such studies, particularly on epiphytic species in tropical ecosystems, are still limited. Previous research has suggested that precipitation has a major impact on epiphyte survival and thus can be considered a candidate driver of epiphytic root trait variation, though compelling evidence is lacking. In this study, we investigated variation in 19 root functional traits in 43 epiphytic (36 species) and 14 terrestrial (7 species) orchids along an e

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Montaldi, Massimo. "Anthropology applied to the analysis of social deviances and the effects of uprooting on individual trans-generational behavior / Antropologia applicata all’analisi delle devianze sociali e gli effetti dello sradicamento sul comportamento individuale trans generazionale / Antropología aplicada al análisis de las desviaciones sociales y de los efectos del desarraigo en el comportamiento transgeneracional individual." Rivista di Psicopatologia Forense, Medicina Legale, Criminologia, October 8, 2019. http://dx.doi.org/10.4081/psyco.2019.64.

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This article aims to clarify some points of view and aspects on the relationship between multiculturalism and migration, and the relationship between minor and major normative jurisprudences, against the dynamic background of historical and anthropological processes, in a criminological perspective, and using some theories that argue why the phenomena of deviance are associated with intercultural and ethnic contexts. The interaction between outgroup and ingroup, while modern societies are engaged in solving problems related to the management and control of regulatory deviance, seems to bring o

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