U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Subject "ultrastructure" Remove constraint Subject: "ultrastructure"
Start Over

Search

8,091  Search Results

« Previous | 1 - 20 of 8,091 |
Number of results to display per page

Search Results

1. Comparative Ultrastructural Analysis to Seven Subgenera of Cassida Linnaeus, 1758 (Coleoptera: Chrysomelidae: Cassidinae) Based on Aedeagus of the Type Species and Its Taxonomic Significance

Author:
Hüseyin Özdikmen; Bal Neslihan; Damla Amutkan Mutlu; Zekiye Suludere
Source:
Transactions of the American Entomological Society 2022 v.148 no.1 pp. 65-112
ISSN:
0002-8320
Subject:
ultrastructure,   etc   ; Cassida; aedeagus; polyphyly; taxonomic keys;     Show all 5 Subjects
Abstract:
... Aedeagus of the type species of seven subgenera in the genus CassidaLinnaeus, 1758 have been studied and figured. Twenty aedeagal structures of these species of were evaluated in detail under both stereo microscope and Scanning Electron Microscope (SEM).Contrary of popular acceptance, it is demonstrated that the characteristics of the aedeagal structure, which can be obtained with SEM studies espe ...
DOI:
10.3157/061.148.0106

2. Ultrastructure of sensilla on the antennae and maxillary palpi of the human-biting black flies, Simulium nigrogilvum and Simulium umphangense, (Diptera: Simuliidae) in Thailand

Author:
Fan Huang; Wichai Srisuka; Kittipat Aupalee; Thippawan Yasanga; Rochana Phuackchantuck; Benjawan Pitasawat; Anuluck Junkum; Kwankamol Limsopatham; Sangob Sanit; Jassada Saingamsook; Hiroyuki Takaoka; Atiporn Saeung
Source:
Acta tropica 2022 v.232 pp. 106494
ISSN:
0001-706X
Subject:
ultrastructure,   etc   ; Simulium; adults; palps; sensilla; Thailand;     Show all 6 Subjects
Abstract:
... Antennae and maxillary palpi are the most important sensory organs involved in the behaviors of black flies. The ultrastructure of sensilla on these sensory appendages of two human-biting black fly species, Similium nigrogilvum and Simulium umphangense, was studied for the first time. Wild adult females of both species were collected in Umphang District, Tak Province, western Thailand. The morphol ...
DOI:
10.1016/j.actatropica.2022.106494

3. Ultrastructure and development of sporoderm in Andreaeobryum macrosporum Steere & B.M. Murray (Andreaeobryopsida)

Author:
Svetlana V. Polevova; Ulyana N. Spirina; Michael S. Ignatov
Source:
Review of palaeobotany and palynology 2022 v.300 pp. 104621
ISSN:
0034-6667
Subject:
ultrastructure,   etc   ; exine; intine; paleobotany; palynology; spores; sporopollenin;     Show all 7 Subjects
Abstract:
... Sporoderm development in Andreaeobryum is studied and confirned to be similar to that in Andreaea in having no lamellate structure in the exine. The formation of the outer layers of the spore wall, external to the intine, proceeds by the accumulation of sporopollenin granules originating within the special wall of the sporocyte. Despite the outermost sublayer having a pattern similar to the perine ...
DOI:
10.1016/j.revpalbo.2022.104621

4. The Morphology, Ultrastructure and Molecular Phylogeny of a New Soil-Dwelling Kinetoplastid Avlakibodo gracilis gen. et sp. nov. (Neobodonida; Kinetoplastea)

Author:
Artem O. Belyaev; Dmitriy G. Zagumyonnyi; Alexander P. Mylnikov; Denis V. Tikhonenkov
Source:
Protist 2022 pp. 125885
ISSN:
1434-4610
Subject:
ultrastructure,   etc   ; microtubules; new genus; new species; phylogeny; protists;     Show all 6 Subjects
Abstract:
... Kinetoplastids represent a stockpile of undiscovered protist diversity. Free-living members of this group have been studied less intensively compared to their important parasitic relatives. We have isolated a new soil-dwelling bacteriotrophic kinetoplastid, which is described here as a new genus and new species, Avlakibodo gracilis gen. et sp. nov. Phylogenetic analysis of 18S rRNA genes showed hi ...
DOI:
10.1016/j.protis.2022.125885

5. Antidepressant-like effect of ginsenoside Rb1 on potentiating synaptic plasticity via the miR-134–mediated BDNF signaling pathway in a mouse model of chronic stress-induced depression

Author:
Guoli Wang; Tianyue An; Cong Lei; Xiaofeng Zhu; Li Yang; Lianxue Zhang; Ronghua Zhang
Source:
Journal of Ginseng Research 2022 v.46 no.3 pp. 376-386
ISSN:
1226-8453
Subject:
ultrastructure,   etc   ; Panax; ginsenosides; hippocampus; mice; microRNA; neuroplasticity; pathogenesis; research;     Show all 9 Subjects
Abstract:
... Brain-derived neurotrophic factor (BDNF)–tropomyosin-related kinase B (TrkB) plays a critical role in the pathogenesis of depression by modulating synaptic structural remodeling and functional transmission. Previously, we have demonstrated that the ginsenoside Rb1 (Rb1) presents a novel antidepressant-like effect via BDNF–TrkB signaling in the hippocampus of chronic unpredictable mild stress (CUMS ...
DOI:
10.1016/j.jgr.2021.03.005

6. Cotton genes GhMML1 and GhMML2 control trichome branching when ectopically expressed in tobacco

Author:
Li Ye; Yali Chen; Kun Chen; Duofeng Yang; Linyun Ding; Qinli Yang; Chenyu Xu; Jiedan Chen; Tianzhen Zhang; Yan Hu
Source:
Gene 2022 v.820 pp. 146308
ISSN:
0378-1119
Subject:
ultrastructure,   etc   ; Arabidopsis; cotton; genes; leaves; secretion; tobacco; transactivators; trichomes;     Show all 9 Subjects
Abstract:
... Trichomes exhibit extraordinary diversity in shape, ultrastructure, distribution, secretion capability, biological functions, and morphological differences, which are strongly associated with their multifunction. Previous researches showed MIXTA-like transcription factors involved in regulating trichome initiation and patterning via forming MYB-bHLH-WD40 transcriptional activator complex to induce ...
DOI:
10.1016/j.gene.2022.146308

7. Evolution of the ultrastructure and polysaccharide composition of flax fibres over time: When history meets science

Author:
Alessia Melelli; Frédéric Jamme; Johnny Beaugrand; Alain Bourmaud
Source:
Carbohydrate polymers 2022 v.291 pp. 119584
ISSN:
0144-8617
Subject:
ultrastructure,   etc   ; cultural heritage; flax; humans; polysaccharides; Europe; Middle East;     Show all 7 Subjects
Abstract:
... Flax fibres have been used by humans for approximately 10,000 years. With time, the geographic area of production and cultivation has changed, as have the applications of flax fibres; from clothing to sails and paintings from antiquity, to automotive, fashion, and design applications in the contemporary era. The degradation process of flax fibres is the same for both ancient and modern objects mad ...
DOI:
10.1016/j.carbpol.2022.119584

8. Emma E. van Nieuwkoop (1933–2022)

Author:
Pieter Baas
Source:
IAWA journal 2022 v.43 no.1-2 pp. 216
ISSN:
0928-1541
Subject:
ultrastructure,   etc   ; cell walls; computer software; flora; magnetism; old and fossil wood;     Show all 6 Subjects
Abstract:
... Emma van Nieuwkoop (for friends Emmy) passed away at her home in Oegstgeest on 12 January 2022 at the age of 88. Emma’s role in the IAWA cannot be overestimated. It started in 1977 when the IAWA Office had moved from Syracuse, NY, USA to Leiden, and the IAWA Bulletin had to be produced in-house in the Rijksherbarium, the new hosting institution. Emma, a secretary of the Flora Maelesiana Foundation ...
DOI:
10.1163/22941932-00002200

9. Histological and electron microscopic analysis of germinal material in miracidia of Schistosoma mansoni

Author:
A. S. Tokmakova; G. L. Ataev
Source:
Parasitology research 2022 v.121 no.1 pp. 465-469
ISSN:
0932-0113
Subject:
ultrastructure,   etc   ; Schistosoma mansoni; electron microscopy; histology; metamorphosis; miracidia; parasitology; reproduction; research;     Show all 9 Subjects
Abstract:
... We performed histological and electron microscopic analysis of miracidia of Schistosoma mansoni in order to examine their germinal elements. In total, about 20 germinal cells at different stages of maturation were found. We described their ultrastructure and proposed a scheme of reproduction of mother sporocysts of S. mansoni based on our data and literature information. According to this scheme, ...
DOI:
10.1007/s00436-021-07353-y

10. Nucleolar RNA in action: Ultrastructure revealed during protein translation through a terpyridyl manganese(II) complex

Author:
Jiejie Liu; Qiumei Gu; Wei Du; Zhihui Feng; Qiong Zhang; Yupeng Tian; Kui Luo; Qiyong Gong; Xiaohe Tian
Source:
Biosensors & bioelectronics 2022 v.203 pp. 114058
ISSN:
0956-5663
Subject:
ultrastructure,   etc   ; biosensors; cell nucleolus; electron microscopy; interphase; manganese; protein synthesis; ribosomes;     Show all 8 Subjects
Abstract:
... Nucleolar RNA stored within the interphase nucleus offers a targetable site for processing ribosomal RNAs that can significantly impact the synthesis of cytosolic protein. Nevertheless, information regarding nucleolus ultrastructure is still largely limited to observations from electron microscopy, while its interior information including the correlation between nucleolar RNA and ribosomes remains ...
DOI:
10.1016/j.bios.2022.114058

11. Fine Structure of the Visual System of Arge similis (Hymenoptera, Argidae)

Author:
Chao Wen; Zijian Pan; Shiping Liang; Liming Shen; Xiujun Wen; Cai Wang
Source:
Insects 2022 v.13 no.2 pp. -
ISSN:
2075-4450
Subject:
ultrastructure,   etc   ; Arge; compound eyes; cornea; light intensity; light microscopy; transmission electron microscopy;     Show all 7 Subjects
Abstract:
... External morphology and ultrastructure of the visual system of Arge similis (Vollenhoven, 1860) adults were investigated by light microscopy, scanning electron microscopy, and transmission electron microscopy. Each compound eye contains 2022 ± 89 (mean ± SE) facets in males and 2223 ± 52 facets in females. Arge similis has an apposition kind of compound eye composed of a cornea, a crystalline cone ...
DOI:
10.3390/insects13020152

12. Species delimitation within the colonial flagellates Uroglena, Uroglenopsis and Urostipulosphaera (Chrysophyceae)

Author:
Martin Pusztai; Pavel Škaloud
Source:
European journal of phycology 2022 v.57 no.1 pp. 79-95
ISSN:
1469-4433
Subject:
ultrastructure,   etc   ; Uroglena; Uroglenopsis; algology; ecology; new species; phylogeny; taxonomic keys; taxonomic revisions;     Show all 9 Subjects
Abstract:
... Until recently, there was no agreement on species delimitation within the morphologically similar chrysophycean genera Uroglena, Uroglenopsis and Urostipulosphaera. In this study, we aimed at a modern taxonomic revision based on the combination of morphological characters (ultrastructure of cysts, cell and colony features) and a multigene phylogeny (SSU, ITS rDNA and rbcL sequences), with ecology ...
DOI:
10.1080/09670262.2021.1892196

13. Ultrastructure of the larval eyes of the hangingfly Terrobittacus implicatus (Mecoptera: Bittacidae)

Author:
Ying-Ying Zheng; Qing-Xiao Chen; Qi Yi; Bao-Zhen Hua
Source:
Micron 2022 v.152 pp. 103176
ISSN:
0968-4328
Subject:
ultrastructure,   etc   ; Bittacidae; Panorpidae; cornea; cytoplasm; evolution; larvae; ommatidia; photoreceptors; transmission electron microscopy;     Show all 10 Subjects
Abstract:
... The fine structure of the larval eyes of the hangingfly Terrobittacus implicatus (Huang & Hua) was investigated using scanning and transmission electron microscopy. The results show that the larval eyes of T. implicatus each consist of seven spaced ommatidia. Each ommatidium is composed of a corneal lens with about 45 lamellae, a tetrapartite eucone type of crystalline cone, eight retinula cells, ...
DOI:
10.1016/j.micron.2021.103176

14. Application of titanium regulates the functional components of photosynthetic apparatus in grafted seedlings of Carya cathayensis Sarg. under shade

Author:
Daoliang Yan; Feng Song; Zhen Li; Anket Sharma; Xiaoting Xie; Tingting Wu; Xiaofei Wang; Yi He; Jiabao Chen; Qiaoyu Huang; Lu Zhao; Rongling Wu; Shihui Niu; Huwei Yuan; Bingsong Zheng
Source:
Chemosphere 2022 v.290 pp. 133301
ISSN:
0045-6535
Subject:
ultrastructure,   etc   ; Carya cathayensis; chlorophyll; chloroplasts; photosynthesis; ribulose-bisphosphate carboxylase; specific leaf weight; titanium;     Show all 8 Subjects
Abstract:
... Light acts as a key environmental factor for normal growth and development of plants. Carya cathayensis Sarg. (hickory) faces low light conditions, especially those caused by cloudy or rainy days during the rapid growth period, which has caused adverse effects on its growth. In the current investigation, to alleviate the adverse effects of insufficient light on the cultivation of hickory, anti-hyd ...
DOI:
10.1016/j.chemosphere.2021.133301

15. The decreased PG content of pgp1 inhibits PSI photochemistry and limits reaction center and light-harvesting polypeptide accumulation in response to cold acclimation

Author:
Alexander G. Ivanov; Marianna Krol; Leonid V. Savitch; Beth Szyszka-Mroz; Jessica Roche; D. P. Sprott; Eva Selstam; Kenneth W. Wilson; Richard Gardiner; Gunnar Öquist; Vaughan M. Hurry; Norman P. A. Hüner
Source:
Planta 2022 v.255 no.2 pp. 36
ISSN:
0032-0935
Subject:
ultrastructure,   etc   ; Arabidopsis; acclimation; cold; energy; immunoblotting; mutants; phenotype; photochemistry; photosystem II; polypeptides; temperature; thylakoids;     Show all 13 Subjects
Abstract:
... MAIN CONCLUSION: Decreased PG constrains PSI activity due to inhibition of transcript and polypeptide abundance of light-harvesting and reaction center polypeptides generating a reversible, yellow phenotype during cold acclimation of pgp1. Cold acclimation of the Arabidopsis pgp1 mutant at 5 °C resulted in a pale-yellow phenotype with abnormal chloroplast ultrastructure compared to its green pheno ...
DOI:
10.1007/s00425-022-03819-0

16. Application of X-ray diffraction to assess the microfibril angle of green and dry Eucalyptus grandis wood

Author:
Naiara Conceição Marques de Souza; José Tarcísio Lima; Bruno Charles Dias Soares
Source:
Trees 2022 v.36 no.1 pp. 191-197
ISSN:
0931-1890
Subject:
ultrastructure,   etc   ; Eucalyptus grandis; X-ray diffraction; cell walls; cellulose microfibrils; models; polarized light microscopy; wood;     Show all 8 Subjects
Abstract:
... KEY MESSAGE: X-ray diffraction allows indirect measurement of the microfibril angle (MFA) in green and dry wood, revealing that there are statistical differences between the MFAs of these woods. Wood drying is essential for most wood uses; however, the removal of water from wood can lead to defects. Although it is consolidated that water removal to below the fibers saturation point causes a decrea ...
DOI:
10.1007/s00468-021-02194-9

17. Prenatal Low-Protein Diet Affects Mitochondrial Structure and Function in the Skeletal Muscle of Adult Female Offspring

Author:
Vipin A. Vidyadharan; Ancizar Betancourt; Craig Smith; Chandrasekhar Yallampalli; Chellakkan S. Blesson
Source:
Nutrients 2022 v.14 no.6 pp. -
ISSN:
2072-6643
Subject:
ultrastructure,   etc   ; adults; females; glucose; insulin resistance; low protein diet; metabolism; mitochondria; pregnancy; progeny; skeletal muscle;     Show all 11 Subjects
Abstract:
... Gestational low-protein (LP) diet leads to glucose intolerance and insulin resistance in adult offspring. We had earlier demonstrated that LP programming affects glucose disposal in females. Mitochondrial health is crucial for normal glucose metabolism in skeletal muscle. In this study, we sought to analyze mitochondrial structure, function, and associated genes in skeletal muscles to explore the ...
DOI:
10.3390/nu14061158

18. The alleviation of lignin inhibition on enzymatic hydrolysis of cellulose by changing its ultrastructure

Author:
Xindong Chen; Hailong Li; Shimiao Yao; Can Wang; Xuefang Chen; Haijun Guo; Lian Xiong; Hairong Zhang; Xinde Chen
Source:
Industrial crops and products 2022 pp. 115108
ISSN:
0926-6690
Subject:
ultrastructure,   etc   ; 2-naphthol; acid treatment; cellulose; enzymatic hydrolysis; hot water treatment; hydrolysis; lignin; phosphoric acid;     Show all 9 Subjects
Abstract:
... Lignin is regarded as the primary factor that inhibits enzymatic hydrolysis of cellulose. However, the impact of cellulose ultrastructure on the inhibition of lignin during enzymatic hydrolysis is still unclear. In this work, the addition of lignin during enzymatic hydrolysis of cellulose with different ultrastructure was investigated. Furthermore, the influences of changing cellulose ultrastructu ...
DOI:
10.1016/j.indcrop.2022.115108

19. Comparative Ultrastructural Analysis of Six Subgenera of Cassida Linnaeus, 1758 (Coleoptera: Chrysomelidae: Cassidinae) Based on Spermatheca of the Type Species and Its Taxonomic Significance

Author:
Hüseyin Özdikmen; Neslihan Bal; Damla Amutkan Mutlu; Zekiye Suludere
Source:
Transactions of the American Entomological Society 2021 v.147 no.1 pp. 67-99
ISSN:
0002-8320
Subject:
ultrastructure,   etc   ; Cassida; monophyly; polyphyly; spermatheca;     Show all 5 Subjects
Abstract:
... Spermathecae of the type species of six subgenera in the genus CassidaLinnaeus, 1758 have been studied and figured. Spermathecal structures of these species on the base of 24 specified characters were evaluated in detail under both stereo microscope and Scanning Electron Microscope (SEM). It is demonstrated that the characteristics of the spermathecal structure obtained particularly with SEM studi ...
DOI:
10.3157/061.147.0106

20. Porous or non-porous? The challenge of studying unusual placoid sensilla of Megaphragma wasps (Hymenoptera, Trichogrammatidae) with electron microscopy

Author:
Anna V. Diakova; Alexey A. Polilov
Source:
Journal of Hymenoptera research 2021 v.84 pp. 69-73
ISSN:
1314-2607
Subject:
ultrastructure,   etc   ; Trichogrammatidae; research; sensilla; smell;     Show all 5 Subjects
Abstract:
... Extreme miniaturization implies a high degree of optimization, rendering the retention of non-functional organs almost impossible. Two unique non-porous placoid sensilla on the antennae of females of Megaphragma were described in the literature. Placoid sensilla in Hymenoptera have an olfactory function and always bear pores; the apparent absence of pores therefore raises the questions whether suc ...
DOI:
10.3897/jhr.84.68707