Thematische Bibliographien / Teeth Growth Molecular aspects

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Auswahl der wissenschaftlichen Literatur zum Thema „Teeth Growth Molecular aspects“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 28. Januar 2023

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Zeitschriftenartikel zum Thema "Teeth Growth Molecular aspects"

About, Imad, und Thimios A. Mitsiadis. „Molecular Aspects of Tooth Pathogenesis and Repair: in vivo and in vitro Models“. Advances in Dental Research 15, Nr. 1 (August 2001): 59–62. http://dx.doi.org/10.1177/08959374010150011501.

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Several growth factors and extracellular matrix molecules, which are expressed during embryonic tooth development, are re-expressed in dental tissues under pathological conditions. Pathological conditions such as caries lesions and dental injuries are often lethal to the odontoblasts, which are then replaced by other pulp cells. These cells are able to differentiate into odontoblast-like cells and produce a reparative dentin. Here we demonstrate the in vivo distribution of several molecules in human permanent teeth under normal and pathological conditions. The intermediate filament protein nestin, which is a marker of young odontoblasts, is absent from old permanent teeth. Similarly, the Notch protein, which is involved in cell fate specification and is localized in the sub-odontoblastic cell layer during odontogenesis, is not detected in adult dental tissues. In carious and injured teeth, nestin is expressed in a selective manner in odontoblasts surrounding the injury site, while Notch is expressed in the sub-odontoblastic layer of cells. We reproduced this physiological event in an in vitro culture system. Pulp cells cultured in the presence of P-glycerophosphate formed mineralization nodules. As odontoblasts, pulp cells contributing to the nodule formation express type I collagen, osteonectin, dentin sialophosphoprotein, and nestin. In this in vitro assay system, nestin is up-regulated after local application of Bone Morphogenetic Protein 2 and 4. Fourier transform infrared microspectroscopy showed that both the organic and the mineral compositions of the nodules have the characteristics of human dentin and differ from those of enamel and bone. These findings show that both the molecular and the mineral characteristics of the human dentin matrix are respected in the in vitro culture conditions.

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Yang, Chao, Yu Chen, Liwu Zhong, Min You, Zhiling Yan, Maowen Luo, Bo Zhang, Benyanzi Yang und Qiang Chen. „Homogeneity and heterogeneity of biological characteristics in mesenchymal stem cells from human umbilical cords and exfoliated deciduous teeth“. Biochemistry and Cell Biology 98, Nr. 3 (Juni 2020): 415–25. http://dx.doi.org/10.1139/bcb-2019-0253.

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Mesenchymal stem cells (MSCs) have proven powerful potential for cell-based therapy both in regenerative medicine and disease treatment. Human umbilical cords and exfoliated deciduous teeth are the main sources of MSCs with no donor injury or ethical issues. The goal of this study was to investigate the differences in the biological characteristics of human umbilical cord mesenchymal stem cells (UCMSCs) and stem cells from human exfoliated deciduous teeth (SHEDs). UCMSCs and SHEDs were identified by flow cytometry. The proliferation, differentiation, migration, chemotaxis, paracrine, immunomodulatory, neurite growth-promoting capabilities, and acetaldehyde dehydrogenase (ALDH) activity were comparatively studied between these two MSCs in vitro. The results showed that both SHEDs and UCMSCs expressed cell surface markers characteristic of MSCs. Furthermore, SHEDs exhibited better capacity for proliferation, migration, promotion of neurite growth, and chondrogenic differentiation. Meanwhile, UCMSCs showed more outstanding adipogenic differentiation and chemotaxy. Additionally, there were no significant differences in osteogenic differentiation, immunomodulatory capacity, and the proportion of ALDHBright compartment. Our findings indicate that although both UCMSCs and SHEDs are mesenchymal stem cells and presented some similar biological characteristics, they also have differences in many aspects, which might be helpful for developing future clinical cellular therapies.

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Panaretto, BA. „Gene expression of potential morphogens during hair follicle and tooth formation: a review“. Reproduction, Fertility and Development 5, Nr. 4 (1993): 345. http://dx.doi.org/10.1071/rd9930345.

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Early work on the morphogenesis of hairs and teeth was largely descriptive histology and established the times and order of visible initiation of anlagen and their patterns of development. However, in the last 30 years, many growth factors have been discovered; more recently, their expression during morphogenesis has been determined and immunohistochemistry has enabled the visualization of structural elements of organs. This review is concerned primarily with aspects of these recent phases of research with respect to the formation of hairs and, to a lesser degree, teeth. The expression of several growth factors including bone morphogenetic proteins 2 and 4, the glycoprotein tenascin, the proteoglycan syndecan, and the expression of the mammalian homologue of Notch, cadherins and epimorphin is examined here during the early stages of organogenesis, primarily to review the type of research that should be extended to the organogenesis of wool fibres in Merino sheep. Signal transduction, the third and increasingly complex phase of research that is now rapidly developing, follows the establishment of ligand-receptor complexes during morphogenesis and is included here in a preliminary way.

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Uzun, Berna, Dilber Uzun Ozsahin, Hani Hamdan, Jinan Charafeddine, Gürkan Ünsal und Deniz Özyer. „Optimization of Dental Devices and Tools Used on Teeth“. BioMed Research International 2021 (06.08.2021): 1–6. http://dx.doi.org/10.1155/2021/9913788.

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Taking decisions is important in every aspect of life. Decision-making has become a difficult problem in any situation where there are multiple criteria. The application of multicriteria decision-making methods that can bring mathematical and logical solutions to the problem from an analytical perspective has experienced considerable growth recently. It provides great benefits in solution and subsequent stages. Medical equipment selection is also a challenging, complex, and difficult problem for the decision-maker, due to the requirements of conflicting criteria, which must be taken into account simultaneously. In this context, the aim of this study implicates the principle of multicriteria decision-making theories on various types of instruments used in dentistry. Since the data used in this study are not numeric but linguistic, the Fuzzy PROMETHEE decision-making method is used. In this research, six dental tools most commonly used by professionals to perform operations on patients are compared and evaluated. Fuzzy PROMETHEE decision-making method investigations show that the dental mirror is the most effective tool among all compared tools, followed by dental suction, dental air abrasion, dental handpiece, dental laser, and dental X-ray, consequently, basing on the selected criteria and the importance weight given to each criterion. Using this technique, one can obtain more specific ranking results based on a specific preference level.

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Sánchez-Villagra, Marcelo R. „Developmental palaeontology in synapsids: the fossil record of ontogeny in mammals and their closest relatives“. Proceedings of the Royal Society B: Biological Sciences 277, Nr. 1685 (13.01.2010): 1139–47. http://dx.doi.org/10.1098/rspb.2009.2005.

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The study of fossilized ontogenies in mammals is mostly restricted to postnatal and late stages of growth, but nevertheless can deliver great insights into life history and evolutionary mechanisms affecting all aspects of development. Fossils provide evidence of developmental plasticity determined by ecological factors, as when allometric relations are modified in species which invaded a new space with a very different selection regime. This is the case of dwarfing and gigantism evolution in islands. Skeletochronological studies are restricted to the examination of growth marks mostly in the cement and dentine of teeth and can provide absolute age estimates. These, together with dental replacement data considered in a phylogenetic context, provide life-history information such as maturation time and longevity. Palaeohistology and dental replacement data document the more or less gradual but also convergent evolution of mammalian growth features during early synapsid evolution. Adult phenotypes of extinct mammals can inform developmental processes by showing a combination of features or levels of integration unrecorded in living species. Some adult features such as vertebral number, easily recorded in fossils, provide indirect information about somitogenesis and hox-gene expression boundaries. Developmental palaeontology is relevant for the discourse of ecological developmental biology, an area of research where features of growth and variation are fundamental and accessible among fossil mammals.

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Lacruz, Rodrigo S., Stefan Habelitz, J. Timothy Wright und Michael L. Paine. „Dental Enamel Formation and Implications for Oral Health and Disease“. Physiological Reviews 97, Nr. 3 (01.07.2017): 939–93. http://dx.doi.org/10.1152/physrev.00030.2016.

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Dental enamel is the hardest and most mineralized tissue in extinct and extant vertebrate species and provides maximum durability that allows teeth to function as weapons and/or tools as well as for food processing. Enamel development and mineralization is an intricate process tightly regulated by cells of the enamel organ called ameloblasts. These heavily polarized cells form a monolayer around the developing enamel tissue and move as a single forming front in specified directions as they lay down a proteinaceous matrix that serves as a template for crystal growth. Ameloblasts maintain intercellular connections creating a semi-permeable barrier that at one end (basal/proximal) receives nutrients and ions from blood vessels, and at the opposite end (secretory/apical/distal) forms extracellular crystals within specified pH conditions. In this unique environment, ameloblasts orchestrate crystal growth via multiple cellular activities including modulating the transport of minerals and ions, pH regulation, proteolysis, and endocytosis. In many vertebrates, the bulk of the enamel tissue volume is first formed and subsequently mineralized by these same cells as they retransform their morphology and function. Cell death by apoptosis and regression are the fates of many ameloblasts following enamel maturation, and what cells remain of the enamel organ are shed during tooth eruption, or are incorporated into the tooth’s epithelial attachment to the oral gingiva. In this review, we examine key aspects of dental enamel formation, from its developmental genesis to the ever-increasing wealth of data on the mechanisms mediating ionic transport, as well as the clinical outcomes resulting from abnormal ameloblast function.

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Sillen, Andrew, und Vincent Balter. „Strontium isotopic aspects of Paranthropus robustus teeth; implications for habitat, residence, and growth“. Journal of Human Evolution 114 (Januar 2018): 118–30. http://dx.doi.org/10.1016/j.jhevol.2017.09.009.

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Stojanovic, Ljiljana. „Etiological aspects of anterior open bite“. Medical review 60, Nr. 3-4 (2007): 151–55. http://dx.doi.org/10.2298/mpns0704151s.

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Introduction. Open bite is a multifactorial phenomenon and no single factor can account for open-bite. Etiology plays an important role in diagnosis. Heredity, unfavorable growth patterns, incorrect jaw postoure, are the characteristics of skeletal open bite. Digit sucking. Depending on where the thumb is placed, a number of different types of dental problems can develop. Malocclusions of the late mixed or permanent dentitions, caused by thumb sucking are not self corrected and orthodontic treatment is necessary for their correction. Lymphatic tissue. In order to produce oral respiration, the mandible is postured inferiorly with the tongue protruded and resting against the oral floor. This postural alteration induces dental and skeletal modifications similar to those caused by thumb sucking. This may cause excessive eruption of the posterior teeth, leading to an increase in the vertical dimension of the face and result in development of anterior open bite. Tongue thrust. Tongue habits cause an anterior open bite or they develop secondarily to thumb sucking. In skeletal open bite the tongue habit acts as a secondary factor which helps to maintain or exacerbate the condition. Many orthodontists have had a discouraging experience of completing dental treatment, with what appeared to be good results, only to discover that the case had relapsed because the patient had a tongue thrust swallowing pattern. Conclusion. Dentoalveolar or habitual open bite is caused by habits, which influence the growth and development of dentoalveolar processes and contribute to occlusal disharmonies. Prior to eruption of adult dentition, open bite related to oral habits is usually not a concern as when the habits stop, because the erupting dentition tends to improve spontaneously. Treatment is usually not necessary until permanent teeth erupt (~6 years old). .

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Alves da Silva, Adinan, Cíntia Oliveira Silva, Vanessa do Rosario Rosa, Michel Filiphy Silva Santos, Kacilda Naomi Kuki, Maximiller Dal-Bianco, Rafael Delmond Bueno et al. „Metabolic adjustment and regulation of gene expression are essential for increased resistance to severe water deficit and resilience post-stress in soybean“. PeerJ 10 (18.03.2022): e13118. http://dx.doi.org/10.7717/peerj.13118.

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Background Soybean is the main oilseed crop grown in the world; however, drought stress affects its growth and physiology, reducing its yield. The objective of this study was to characterize the physiological, metabolic, and genetic aspects that determine differential resistance to water deficit in soybean genotypes. Methods Three soybean genotypes were used in this study, two lineages (L11644 and L13241), and one cultivar (EMBRAPA 48-C48). Plants were grown in pots containing 8 kg of a mixture of soil and sand (2:1) in a greenhouse under sunlight. Soil moisture in the pots was maintained at field capacity until the plants reached the stage of development V4 (third fully expanded leaf). At this time, plants were subjected to three water treatments: Well-Watered (WW) (plants kept under daily irrigation); Water Deficit (WD) (withholding irrigation until plants reached the leaf water potential at predawn of −1.5 ± 0.2 MPa); Rewatered (RW) (plants rehydrated for three days after reached the water deficit). The WW and WD water treatments were evaluated on the eighth day for genotypes L11644 and C48, and on the tenth day for L13241, after interruption of irrigation. For the three genotypes, the treatment RW was evaluated after three days of resumption of irrigation. Physiological, metabolic and gene expression analyses were performed. Results Water deficit inhibited growth and gas exchange in all genotypes. The accumulation of osmolytes and the concentrations of chlorophylls and abscisic acid (ABA) were higher in L13241 under stress. The metabolic adjustment of lineages in response to WD occurred in order to accumulate amino acids, carbohydrates, and polyamines in leaves. The expression of genes involved in drought resistance responses was more strongly induced in L13241. In general, rehydration provided recovery of plants to similar conditions of control treatment. Although the C48 and L11644 genotypes have shown some tolerance and resilience responses to severe water deficit, greater efficiency was observed in the L13241 genotype through adjustments in morphological, physiological, genetic and metabolic characteristics that are combined in the same plant. This study contributes to the advancement in the knowledge about the resistance to drought in cultivated plants and provides bases for the genetic improvement of the soybean culture.

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Ebendal, T. „Molecular aspects of nerve growth factor expression“. Acta Neurologica Scandinavica 79, Nr. 3 (März 1989): 252–53. http://dx.doi.org/10.1111/j.1600-0404.1989.tb03752.x.

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Dissertationen zum Thema "Teeth Growth Molecular aspects"

Dempsey, Paula Jane. „Genetic and environmental contributions to morphological variation in the human permanent dentition : a study of Australian twins“. Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phd389.pdf.

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Bibliography: leaves 348-366. Elucidates the nature and extent of genetic and environmental contributions to variation in permanent tooth crown size. Sibling correlations are compared to find evidence of sex-linked genes contributing to crown size. This hypothesis was tested by comparing mean tooth size in female-male opposite-sex twins with same-sex twins, and singletons.

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De, Angelis Daniel. „Syndecan-1 expression during postnatal tooth and oral mucosa development in 2 day to 6 week old rats“. Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09DM/09dmd284.pdf.

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Includes bibliographical references (leaves 68-76) Aims to observe changes in the expression of syndecan-1 in both the developing epithelium of the rat oral mucosa, and in epithelial cell rests of Malassez in the developing periodontium of normal rat molars, from late crown development through to early eruption.

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Josephson, Anna. „Spinal cord injury: mechanical and molecular aspects /“. Stockholm, 2002. http://diss.kib.ki.se/2002/91-7349-235-3/.

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Devine, R. L. S. „Some kinetic and thermodynamic aspects of molecular beam epitaxy“. Thesis, University of Glasgow, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378055.

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Zhang, Youjun, und 张有君. „Growth promoting effects of AtPAP2 in potato and camelina“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46476945.

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Pinkerton, Mark Neil, und n/a. „The molecular basis of orthodontic tooth movement : cytokine signaling by PDL cells in tension an in vitro study“. University of Otago. School of Dentistry, 2007. http://adt.otago.ac.nz./public/adt-NZDU20071207.161056.

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The pressure-tension hypothesis is the governing dogma of orthodontic tooth movement. This theory proposes that the application of loads to the crown of a tooth during orthodontic mechano-therapy results in differential site-specific reactionary strains in the para-dental tissues. Briefly, following the application of orthodontic load the bone and periodontal ligament (PDL) on one side of the tooth is placed in compression favoring bone resorption, while on the other side of the tooth they are placed in tension favoring osteogenesis The present in vitro model provides a surrogate for the PDL on the tension side of the tooth during orthodontic tooth movement and aims to identify mechanically induced changes in the expression of osteo-regulatory cytokines in human PDL cell cultures in response to tensile mechanical strain. Materials and Methods: PDL explants were obtained from pathology free bicuspids of two human subjects following extraction of the teeth for orthodontic purposes. Following serial passage, cells were plated on Uniflex� plates and consigned to either the experimental or control groups. Experimental cells were exposed to a cyclic uniaxial tensile mechanical strain for 6,12 or 24 hours using the Flexercell FX 4000 strain unit. Total RNA was extracted using a two-step procedure and samples were analysed using real-time RT-PCR assays for a range of osteo-regulatory cytokines. Results: Human PDL cells expressed mRNA for a range of cytokines of known significance to osteogenesis and osteoclastogenesis in response to mechanical stimulation. Conclusions: The production of osteo-regulatory cytokines by PDL cells in response to mechanical strain suggests that these cells have the potential to contribute to the osseous modeling of orthodontic tooth movement. The presence of osteogenic signalling drive in response to tensile strain tends to support the basic assertions of the pressure-tension hypothesis.

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Dai, Zhijie, und 戴志洁. „The role of sodium/myo-inositol cotransporter 1 and myo-inositol in osteogenesis and bone formation“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43783533.

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Conley, Travis B. „Growth response to resistance exercise : influence of exercise device“. Virtual Press, 2008. http://liblink.bsu.edu/uhtbin/catkey/1395457.

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The purpose of this study was to compare the growth response elicited by an acute bout of resistance exercise (RE) conducted on a traditional weight stack device (WS) and a flywheel device (FW). Eight recreationally trained males (25 ± 9 y, 77 ± 27 kg) performed 4 sets of 7 repetitions of bilateral knee extension on each exercise device separated by 7 days. Muscle biopsies were obtained from the vastus lateralis at rest and 4 hrs post-exercise to examine the expression of selected myogenic and proteolytic genes. RE increased (P < 0.05) mRNA expression of Myogenin (3.6 vs. 3.6 fold), and MyoD (2.2 vs. 2.0 fold) and decreased (P < 0.05) expression of Myostatin (1.4 vs. 1.5 fold) to a similar degree on both exercise devices. There was no change in the expression of Atrogin-1, MuRF-1 or MRF4 following RE on either device. The only device mediated difference in the expression of the selected genes was observed in Atrogin-1 which was lower following RE on the FW versus the WS device. The current data shows that in the initial hrs following RE, use of the FW is as effective as the traditional resistance training devices (WS) in promoting the induction of genes involved with muscle remodeling and growth.
School of Physical Education, Sport, and Exercise Science

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Limbach, Christoph. „Molecular, cellular, and functional aspects of gravity sensing and gravity-oriented tip growth“. [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978930010.

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Chan, Cheuk-wing Wilson, und 陳卓榮. „ER stress in the pathogenesis of osteochondrodysplasia“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085192.

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Bücher zum Thema "Teeth Growth Molecular aspects"

Lyngstadaas, Stale Petter. On the molecular biology of tooth formation: Biomineralization, structure, evolution and genetics of calcified dental tissues : a thesis. Oslo: Department of Oral Biology, Faculty of Dentistry and Biotechnology Centre of Oslo, University of Oslo, 1995.

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B, Ferguson D., Hrsg. Aspects of oral molecular biology. Basel: Karger, 1991.

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Dietz, Georg. Calcium hydroxide and bone regeneration: Odontological aspects of induced osteogenesis in experiment and clinical practice. München: G. Dietz, 1998.

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1941-, Hall Brian Keith, und Newman Stuart, Hrsg. Cartilage: Molecular aspects. Boca Raton, Fla: CRC Press, 1991.

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1945-, LeRoith Derek, Hrsg. Insulin-like growth factors: Molecular and cellular aspects. Boca Raton: CRC Press, 1991.

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E, Maragoudakis Michael, Gullino Pietro M, Lelkes Peter I, North Atlantic Treaty Organization. Scientific Affairs Division. und NATO Advanced Study Institute on Angiogenesis: Molecular Biology, Clinical Aspects (1993 : Rhodes, Greece), Hrsg. Angiogenesis: Molecular biology, clinical aspects. New York: Plenum Press, 1994.

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Plant growth and development: A molecular approach. San Diego: Academic Press, 1994.

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Alfredo, Gorio, American Society for Neurochemistry, International Society for Neurochemistry, National Science Foundation (U.S.) und North Atlantic Treaty Organization. Scientific Affairs Division., Hrsg. Neural development and regeneration: Cellular and molecular aspects. Berlin: Springer-Verlag, 1988.

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R, Barton Paul J., Hrsg. Molecular biology of cardiac development and growth. Austin: R.G. Landes Co., 1995.

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Institute of Developmental Neuroscience & Aging. Conference (2nd 1988 Athens, Greece). Molecular aspects of development and aging of the nervous system. New York: Plenum Press, 1989.

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Buchteile zum Thema "Teeth Growth Molecular aspects"

Pchelyakov, O. P., Yu B. Bolkhovityanov, A. I. Nikiforov, B. Z. Olshanetsky, L. V. Sokolov, S. A. Teys und B. Voigtländer. „Atomistic Aspects of Sige Nanostructure Formation by Molecular-Beam Epitaxy“. In Atomistic Aspects of Epitaxial Growth, 371–81. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0391-9_28.

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Ferrara, Napoleone. „The Biology of Vascular Endothelial Growth Factor“. In Molecular, Cellular, and Clinical Aspects of Angiogenesis, 73–83. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0389-3_7.

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Schippers, Bob, Peter A. H. M. Bakker, Albert W. Bakker, Gerard A. J. M. van der Hofstad, Joey D. Marugg, Letty A. de Weger, Jan G. Lamers, Wiel P. M. Hoekstra, Ben J. Lugtenberg und Peter J. Weisbeek. „Molecular Aspects of Plant Growth Affecting Pseudomonas Species“. In Recognition in Microbe-Plant Symbiotic and Pathogenic Interactions, 395–404. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-71652-2_38.

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Ferrara, N. „Vascular Endothelial Growth Factor: Molecular and Biological Aspects“. In Current Topics in Microbiology and Immunology, 1–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59953-8_1.

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Bass, Kathryn E., Donald W. Morrish, Iris Roth, Damyanti Bhardwaj, Robert N. Taylor und Susan J. Fisher. „Epidermal Growth Factor Up-Regulates Human Cytotrophoblast Invasion“. In Molecular and Cellular Aspects of Periimplantation Processes, 303–17. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4612-2548-5_20.

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Lekka, Ch E., G. A. Evangelakis, N. I. Papanicolaou und D. A. Papaconstantopoulos. „Vibrational and Structural Properties of the Nb (001) Surface With and Without a Nb Adatom by Tight-Binding Molecular Dynamics“. In Atomistic Aspects of Epitaxial Growth, 43–49. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0391-9_4.

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Gospodarowicz, Denis. „Molecular and Developmental Biology Aspects of Fibroblast Growth Factor“. In Advances in Experimental Medicine and Biology, 23–39. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4757-1980-2_3.

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Misko, T. P., M. J. Radeke und E. M. Shooter. „Molecular Aspects of the Rat Nerve Growth Factor Receptor“. In Neural Development and Regeneration, 257–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73148-8_23.

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Hoffman, B., D. A. Liebermann, M. Selvakumaran und H. Q. Nguyen. „Role of c-myc in Myeloid Differentiation, Growth Arrest and Apoptosis“. In Molecular Aspects of Myeloid Stem Cell Development, 17–27. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-85232-9_3.

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Threadgill, David W., Della Yee, Christian Thompson und Terry Magnuson. „Epidermal Growth Factor Receptor Deficiency Results in Periimplantation Lethality in Mouse“. In Molecular and Cellular Aspects of Periimplantation Processes, 231–35. New York, NY: Springer New York, 1995. http://dx.doi.org/10.1007/978-1-4612-2548-5_14.

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Konferenzberichte zum Thema "Teeth Growth Molecular aspects"

Silva, Tarcisio Rubens da, Marina Monteiro Navarro, Mylena Mendes Hóstio und Catherine Sonaly Ferreira Martins. „Case report - Ataxia-telangiectasia: innate error of immunity and neurological aspects“. In XIII Congresso Paulista de Neurologia. Zeppelini Editorial e Comunicação, 2021. http://dx.doi.org/10.5327/1516-3180.233.

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Introduction: Among more than 350 immunological deficiencies, 25% have neurological manifestations. Thus, Ataxia-telangiectasia stands out, being considered a combined immunodeficiency. In childhood, cerebellar motor findings and recurrent sinopulmonary infections, signaling early cerebellar degeneration and deficit in the combined immune response. It has an autosomal recessive inheritance pattern. Case report: She describes herself as a female patient, 9 years old, daughter of consanguineous parents and born in Sousa, Paraíba. In the child’s neuropsychomotor development, she sat down at 5 months, verbalized loose words at 12 months and started the process of ambulation at 13 months of life. While walking, the mother noticed strange walking and frequent hospitalizations due to recurrent pneumonia. From 7 years of age, there is worsening of gait and telangiectasias in the conjunctiva are evident. Subsequently, the molecular examination in order to demonstrate the possible mutation. Therefore, a mutation described as c.7913G> A (p.Trp2638 *) was found in homozygosity in exon 53 of the ATM gene. Findings: typical onset of early childhood when walking, swallowing problems with solid and liquid foods and the growth disorder. Regarding the immune system: low levels of immunoglobulins, but without lymphopenia and the worrying presence of adenomegaly, making it necessary to always pay attention to neoplasms such as leukemias and lymphomas. In disagreement, there are no: myoclonus, the highest IgM levels, cutaneous granulomas and bone deformities. Conclusions: The case presents aspects that are very consistent with the scientific findings consolidated in Ataxia-telangiectasia, but the late molecular diagnosis.

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Khan, Hanif Muhammad, und Sung-Gaun Kim. „High Strain Rate Induced Phenomenon in Thin Nickel Films“. In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30631.

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Molecular dynamics study has been performed to investigate the effect of extreme dynamic loading condition on thin Nickel films. Due to the novel aspects of thin films, it has attracted attention over the years for Nano-electro-mechanical systems design. This would be helpful for the analysis of ultra short pulse laser induced fabrication or machining of thin films. Uniaxial high tensile strain namely 109 and 1010 s−1 has been used on a Nickel thin film. The Embedded-atom method (EAM) potential function for Nickel has been used for the interaction of the atoms. We have observed ductile failure mechanism on both the cases. With the increase of strain rate, not only high strength has been found but also the elastic modulus has been affected less. Random non spherical void growth and their coalescence have been also observed during higher loading condition which leads to a ductile failure mechanism.

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Hegab, H., J. Palmer und S. Napper. „Development of a Nanosystems Engineering Degree“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79572.

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Nanotechnology is science at the molecular level. Like biotechnology and information technology, it has tremendous potential to greatly change the world in which we live. Nanosystems engineering can be considered the branch of engineering that deals with materials and devices smaller than 100 nanometers (1 nanometer is a billionth of a meter), especially with the manipulation of individual molecules. Student interest and industry growth in this field highlight the need for a baccalaureate program in this area. The College of Engineering and Science at Louisiana Tech University has developed a new undergraduate degree in nanosystems engineering. The main objectives of this program are (a) to train undergraduate students in experimental, theoretical, and computational aspects of engineering and science as applied to the development and use of nanotechnology; and (b) renovate and revitalize traditional engineering curricula such as mechanical engineering or materials science/ engineering through new nanosystems courses and instructional modules. We describe a new undergraduate Bachelor of Science in Nanosystems Engineering curriculum which has a strong interdisciplinary emphasis. The Nanosystems Engineering Program draws on the strengths of all the basic sciences (chemistry, physics, and biology) and existing integrated engineering and science programs within the college at the freshman and sophomore levels. Graduates with a nanosystems engineering degree will have many opportunities at the boundaries of traditional engineering due to the cross-disciplinary nature of their degree. We expect many of the graduates of this program may choose to pursue research-based careers by moving on to graduate study or working at government laboratories and/or research centers. Graduates who wish to work in a commercial environment will find ever expanding opportunities in the many new nanotechnology companies that are emerging.

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Breica Borozan, Aurica, Despina-Maria Bordean, Gabriel Bujanca, Delia Dumbrava und Sorina Popescu. „CONTROL OF PLANTS OF LOTUS CORNICULATUS L. ON AEROBIC AND ANAEROBIC FREE NITROGEN-FIXING BACTERIA“. In GEOLINKS International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/geolinks2020/b1/v2/07.

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The free nitrogen fixing bacteria are able to mobilize important soil nutrients, transforming through biological processes the unusable molecular nitrogen into an active form and to improve soil fertility, influence many aspects of plant health and ensure their growth, showing interest for the scientific world and farmers. But, on the other hand, this bacterial segment may be influenced by the edaphic factors and the interconnection with the plants, the growth phase, the physiological state and the root system of the plant, by the root exudates, which demonstrates the importance of the bacterial community monitoring from the area of plants influence throughout the growing periods The aim of this study was to evaluate the influence of the age of the plants used as biofertilizer and soil moisture on the free nitrogen fixing bacterial communities (the genera Azotobacter and Clostridium) associated with the roots of the perennial plants of Lotus corniculatus L. There were two zones of interest, namely the area of influence of the roots of the plants (rhizosphere) but also the more distant area (edaphosphere). For the study of aerobic and anaerobic free nitrogen fixing bacteria soil samples were taken together with adjacent plants of Lotus corniculatus L. The experimental variants were located in the western part of Romania, the plants being cultivated on the same soil type, but on different plots, that were in the I-IV years of culture. The influence of Lotus corniculatus L. plants on the free nitrogen fixing bacteria has been reported in control experimental variants. Isolation and study of this bacterial group from the 8 experimental variants was performed on a specific mineral medium, favorable for the growth of the two bacterial genera. The results were evaluated after 5 and 10 days of incubation. Between the two assesments there were no noticeable differences in the nitrogen fixing bacterial community, except for the stimulatory effect observed in the control vatiant and rhizosphere of the first year culture. The plants influence on aerobic and anaerobic free nitrogen fixing bacteria was obvious in the II and IV years of the Lotus corniculatus L. culture, compared to the 76 control variants and varies substantially depending on the age of the plant. In most analyzed soil samples, both bacterial genera, Azotobacter and Clostridium were present, confirming the known ecological relation of unilateral advantage or passive stimulation of the aerobic bacteria compared to the anaerobic clostridia. Exceptions were the samples from the cultures of the first year (rhizosphere and control), but also the rhizosphere from the culture of the year II, where only anaerobic nitrogen fixing bacteria were detected. Our results suggested that plant-soil interactions exert control over the bacteria being studied.

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Ferreira, Nancy, Darley Ferreira und Thais Ferreira. „GENETIC EVALUATION OF MICROCALCIFICATIONS AS A PROGNOSTIC FACTOR“. In Abstracts from the Brazilian Breast Cancer Symposium - BBCS 2021. Mastology, 2021. http://dx.doi.org/10.29289/259453942021v31s2101.

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Introduction: Breast cancer is the most recurring type of cancer among women, with reduced mortality at an initial stage of lesion. From a radiological perspective, perceived microcalcifications may be associated with histological findings such as proliferative injuries with or without atypical features and ductal carcinoma in situ. Currently, percutaneous and vacuum biopsies allow for the correlation between anatomoradiological and identification of previous lesions and those that offer the risk of cancer. No biomarker has been established to predict the risk of cancer in women diagnosed with benign mammary disease. Doing so could strengthen the possibility of stratifying the individual risk of benign injuries for cancer. The platelet-derived growth factor receptor A (PDGFRA) plays its part in tumor oncogenesis, angiogenesis, and metastasis, and its activation is found in some kinds of cancer. In contrast, DNA methylation standards are initial changes to the development of cancer and may be helpful in its early identification, being regulated by a family of enzymes called DNMTs (DNA methyltransferase). Methods: The aim of this study was to evaluate the profile of BI-RADS® 4 and 5 mammary microcalcification women carriers and determine the level of the gene expression of possible molecular markers in 37 patients with mammary microcalcification (paraffin blocks) and 26 patients with breast cancer (fresh in RNA later tissue) cared for at the Hospital Barão de Lucena’s Mastology Ambulatory. Anatomoradiological aspects along with clinical findings have been evaluated , and percentage rates have been calculated. The PDGFRA and DNMTs (DMNT3a) gene expressions have been established using quantitative polymerase chain reaction (qPCR), with the use of β-actin as reference gene. Discussion: In the patients with mammary microcalcification, the average age was 55.9; predominantly whiteskinned subjects (p<0.014). Most of them were mothers (p<0.001), and the average menarche age was 13. The subgroups that presented greater significance were patients classified BI-RADS® in category IV (67.6%) and histological findings of nonproliferative lesion (p<0.001). Lesions of the ductal carcinoma in situ type (100%) presented positive estrogen and progesterone receptors, and 94.6% have undergone sectorectomy surgery by prior needling (p<0.001). The most damaged breast was the left one (62.2%), and the most affected quadrant was the top lateral one (59.5%) (p<0.001). There was no family history in 83.8% of the cases. In the tested microcalcification samples, it was not possible to observe the expression of PDGFRA. Nevertheless, 15 out of 37 patients with microcalcification showed an increase in the gene expression of DMNT3a, most of them greater than Luminal and triple-negative cancer types. Conclusion: The data presented here highlight the improvement on the description of BI-RADS® 4 subclassification in order to better conduct the clinical decision and also demonstrated the potential of DNMTs evaluation in microcalcification samples as a strategy to access the understanding about the role of these molecules in the breast cancer development.

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Berichte der Organisationen zum Thema "Teeth Growth Molecular aspects"

Madhukar, A. Kinetic Aspects of Lattice Mismatch in Molecular Beam Epitaxial Growth on Planar and Patterned Substrates. Fort Belvoir, VA: Defense Technical Information Center, November 1990. http://dx.doi.org/10.21236/ada231636.

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Israel, Alvaro, und John Merrill. Production of Seed Stocks for Sustainable Tank Cultivation of the Red Edible Seaweed Porphyra. United States Department of Agriculture, 2006. http://dx.doi.org/10.32747/2006.7696527.bard.

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Porphyra species (commonly known as ‘nori’ or ‘purple laver’) are edible red seaweeds rich in proteins, vitamins and other highly valued biogenic compounds. For years Porphyra has been cultured using seeded nets extended in the open sea, and its biomass consumed primarily in the Far East. While demands for international markets have increased steadily at an average of 20% per year, supplies are on the verge and not expected to meet future demands. Alternatively, land-based cultivation of seaweed has become attractive in the mariculture industry since (1) important growth parameters can be controlled, (2) is environmentally friendly and (3) perfectly matches with integrated aquaculture leading to sustainable, high quality products. During the last few years a tank cultivation technology for Porphyra has been developed at the Israeli institution. This technology is based on indoor production of asexual spores and their subsequent growth to 1-2 mm seedlings. The seedlings are then transferred to outdoor tanks and ponds when seawater temperatures drop to 20 °C, or below, and days become shorter during winter time. However, the current technology efficiently serves only about 100 m2 of ponds during one growth season. In order to produce seedlings in sufficient amounts, it is critical to address both technical and biological aspects of seedling production, securing optimal up-scale to commercial-size cultivation farms. We hypothesize that massive production of spores is related to thalli origin, thalli age and sporulation triggers, and that seedling survival and their subsequent growth potential is determined by the seawater quality and overall indoor growth conditions imposed. A series of bio-reactors were constructed and tested in which spore release and spore growth were separately studied. The main assessment criteria for optimal viability of the seedlings will be by determining their electron transport rate using PAM fluorometry and by subsequent growth and biomass yields in outdoor ponds. Altogether the project showed (1), controlled sporulation is possible in big outdoor/growth chamber settings provided initial stock material (small frozen seedlings) is at hand, (2), contamination problems can be almost completely avoided if stock material is properly handled (clean as possible and partially dehydrated prior to freezing), (3), spore release can significantly be enhance using high nutrient levels during thawing for P. yezoensis and P. haitanensis, but not for P. rosengurttii, (4), PAM fluorometry is an efficient tool to estimate growth capacity in both seedlings and juvenile thalli. The BARD funding also served to explore other aspects of Porphyra biology and cultivation. For example, the taxonomical status of Porphyra strains used in this study was defined (see appendix), and the potential use of this seaweed in bioremediation was well substantiated. In addition, BARD funding supported a number of opportunities and activities in the Israeli lab, direct or indirectly related to the initial objectives of the project such as: additional molecular work in other seaweeds, description of at least 2 new species for the Israeli Mediterranean, and continuous support for the writing of a book on Global Change and applied aspects of seaweeds. The technology for Porphyra cultivation in land-based ponds is readily available. This study corroborated previous know-how of Porphyra growth in tanks and ponds, and yet offers important improvements regarding seedling production and their handling for successful cultivation. This study supported various other activities opening additional important issues in the biology/cultivation/use of Porphyra and other seaweeds.

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Rajarajan, Kunasekaran, Alka Bharati, Hirdayesh Anuragi, Arun Kumar Handa, Kishor Gaikwad, Nagendra Kumar Singh, Kamal Prasad Mohapatra et al. Status of perennial tree germplasm resources in India and their utilization in the context of global genome sequencing efforts. World Agroforestry, 2020. http://dx.doi.org/10.5716/wp20050.pdf.

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Tree species are characterized by their perennial growth habit, woody morphology, long juvenile period phase, mostly outcrossing behaviour, highly heterozygosity genetic makeup, and relatively high genetic diversity. The economically important trees have been an integral part of the human life system due to their provision of timber, fruit, fodder, and medicinal and/or health benefits. Despite its widespread application in agriculture, industrial and medicinal values, the molecular aspects of key economic traits of many tree species remain largely unexplored. Over the past two decades, research on forest tree genomics has generally lagged behind that of other agronomic crops. Genomic research on trees is motivated by the need to support genetic improvement programmes mostly for food trees and timber, and develop diagnostic tools to assist in recommendation for optimum conservation, restoration and management of natural populations. Research on long-lived woody perennials is extending our molecular knowledge and understanding of complex life histories and adaptations to the environment, enriching a field that has traditionally drawn its biological inference from a few short-lived herbaceous species. These concerns have fostered research aimed at deciphering the genomic basis of complex traits that are related to the adaptive value of trees. This review summarizes the highlights of tree genomics and offers some priorities for accelerating progress in the next decade.

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Ostersetzer-Biran, Oren, und Jeffrey Mower. Novel strategies to induce male sterility and restore fertility in Brassicaceae crops. United States Department of Agriculture, Januar 2016. http://dx.doi.org/10.32747/2016.7604267.bard.

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Abstract Mitochondria are the site of respiration and numerous other metabolic processes required for plant growth and development. Increased demands for metabolic energy are observed during different stages in the plants life cycle, but are particularly ample during germination and reproductive organ development. These activities are dependent upon the tight regulation of the expression and accumulation of various organellar proteins. Plant mitochondria contain their own genomes (mtDNA), which encode for rRNAs, tRNAs and some mitochondrial proteins. Although all mitochondria have probably evolved from a common alpha-proteobacterial ancestor, notable genomic reorganizations have occurred in the mtDNAs of different eukaryotic lineages. Plant mtDNAs are notably larger and more variable in size (ranging from 70~11,000 kbp in size) than the mrDNAs in higher animals (16~19 kbp). Another unique feature of plant mitochondria includes the presence of both circular and linear DNA fragments, which undergo intra- and intermolecular recombination. DNA-seq data indicate that such recombination events result with diverged mitochondrial genome configurations, even within a single plant species. One common plant phenotype that emerges as a consequence of altered mtDNA configuration is cytoplasmic male sterility CMS (i.e. reduced production of functional pollen). The maternally-inherited male sterility phenotype is highly valuable agriculturally. CMS forces the production of F1 hybrids, particularly in predominantly self-pollinating crops, resulting in enhanced crop growth and productivity through heterosis (i.e. hybrid vigor or outbreeding enhancement). CMS lines have been implemented in some cereal and vegetables, but most crops still lack a CMS system. This work focuses on the analysis of the molecular basis of CMS. We also aim to induce nuclear or organellar induced male-sterility in plants, and to develop a novel approach for fertility restoration. Our work focuses on Brassicaceae, a large family of flowering plants that includes Arabidopsis thaliana, a key model organism in plant sciences, as well as many crops of major economic importance (e.g., broccoli, cauliflower, cabbage, and various seeds for oil production). In spite of the genomic rearrangements in the mtDNAs of plants, the number of genes and the coding sequences are conserved among different mtDNAs in angiosperms (i.e. ~60 genes encoding different tRNAs, rRNAs, ribosomal proteins and subunits of the respiratory system). Yet, in addition to the known genes, plant mtDNAs also harbor numerous ORFs, most of which are not conserved among species and are currently of unknown function. Remarkably, and relevant to our study, CMS in plants is primarily associated with the expression of novel chimericORFs, which likely derive from recombination events within the mtDNAs. Whereas the CMS loci are localized to the mtDNAs, the factors that restore fertility (Rfs) are identified as nuclear-encoded RNA-binding proteins. Interestingly, nearly all of the Rf’s are identified as pentatricopeptide repeat (PPR) proteins, a large family of modular RNA-binding proteins that mediate several aspects of gene expression primarily in plant organelles. In this project we proposed to develop a system to test the ability of mtORFs in plants, which are closely related to known CMS factors. We will induce male fertility in various species of Brassicaceae, and test whether a down-relation in the expression of the recombinantCMS-genes restores fertility, using synthetically designed PPR proteins.

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