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Tytuł:
Isolation and expression pattern of RGS21 gene, a novel RGS member
Autorzy:
Li, Xin
Chen, Lei
Ji, Chaoneng
Liu, Bing
Gu, Jiefeng
Xu, Jian
Zou, Xianqiong
Gu, Shaohua
Mao, Yumin
Powiązania:
https://bibliotekanauki.pl/articles/1041351.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
RGS21
G-protein signaling pathway
G-protein α subunit (Gα)
Opis:
Regulators of G-protein signaling (RGS) proteins are known for the RGS domain that is composed of a conserved stretch of 120 amino acids, which binds directly to activated G-protein α subunits and acts as a GTPase-activating protein (GAP), leading to their deactivation and termination of downstream signals. In this study, a novel human RGS cDNA (RGS21), 1795 bp long and encoding a 152-amino acid polypeptide, was isolated by large-scale sequencing analysis of a human fetal brain cDNA library. Unlike other RGS family members, RGS21 gene has no additional domain/motif and may represent the smallest known member of RGS family. It may belong to the B/R4 subfamily, which suggests that it may serve exclusively as a negative regulator of αi/o family members and/or αq/11. PCR analysis showed that RGS21 mRNA was expressed ubiquitously in the 16 tissues examined, implying general physiological roles.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 943-946
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
G protein-coupled receptors - recent advances
Autorzy:
Latek, Dorota
Modzelewska, Anna
Trzaskowski, Bartosz
Palczewski, Krzysztof
Filipek, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1039641.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
G protein-coupled receptors
chemokine receptors
β-adrenergic receptors
rhodopsin
arrestin.
G protein
Opis:
The years 2000 and 2007 witnessed milestones in current understanding of G protein-coupled receptor (GPCR) structural biology. In 2000 the first GPCR, bovine rhodopsin, was crystallized and the structure was solved, while in 2007 the structure of β2-adrenergic receptor, the first GPCR with diffusible ligands, was determined owing to advances in microcrystallization and an insertion of the fast-folding lysozyme into the receptor. In parallel with those crystallographic studies, the biological and biochemical characterization of GPCRs has advanced considerably because those receptors are molecular targets for many of currently used drugs. Therefore, the mechanisms of activation and signal transduction to the cell interior deduced from known GPCRs structures are of the highest importance for drug discovery. These proteins are the most diversified membrane receptors encoded by hundreds of genes in our genome. They participate in processes responsible for vision, smell, taste and neuronal transmission in response to photons or binding of ions, hormones, peptides, chemokines and other factors. Although the GPCRs share a common seven-transmembrane α-helical bundle structure their binding sites can accommodate thousands of different ligands. The ligands, including agonists, antagonists or inverse agonists change the structure of the receptor. With bound agonists they can form a complex with a suitable G protein, be phosphorylated by kinases or bind arrestin. The discovered signaling cascades invoked by arrestin independently of G proteins makes the GPCR activating scheme more complex such that a ligand acting as an antagonist for G protein signaling can also act as an agonist in arrestin-dependent signaling. Additionally, the existence of multiple ligand-dependent partial activation states as well as dimerization of GPCRs result in a 'microprocessor-like' action of these receptors rather than an 'on-off' switch as was commonly believed only a decade ago.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 515-529
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel approach to computer modeling of seven-helical transmembrane proteins: Current progress in the test case of bacteriorhodopsin.
Autorzy:
Nikiforovich, Gregory
Galaktionov, Stan
Balodis, Juris
Marshall, Garland
Powiązania:
https://bibliotekanauki.pl/articles/1044163.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
G-protein coupled receptors
bacteriorhodopsin
computer modeling
Opis:
G-protein coupled receptors (GPCRs) are thought to be proteins with 7-membered transmembrane helical bundles (7TM proteins). Recently, the X-ray structures have been solved for two such proteins, namely for bacteriorhodopsin (BR) and rhodopsin (Rh), the latter being a GPCR. Despite similarities, the structures are different enough to suggest that 3D models for different GPCRs cannot be obtained directly employing 3D structures of BR or Rh as a unique template. The approach to computer modeling of 7TM proteins developed in this work was capable of reproducing the experimental X-ray structure of BR with great accuracy. A combination of helical packing and low-energy conformers for loops most close to the X-ray structure possesses the r.m.s.d. value of 3.13 Å. Such a level of accuracy for the 3D-structure prediction for a 216-residue protein has not been achieved, so far, by any available ab initio procedure of protein folding. The approach may produce also other energetically consistent combinations of helical bundles and loop conformers, creating a variety of possible templates for 3D structures of 7TM proteins, including GPCRs. These templates may provide experimentalists with various plausible options for 3D structure of a given GPCR; in our view, only experiments will determine the final choice of the most reasonable 3D template.
Źródło:
Acta Biochimica Polonica; 2001, 48, 1; 53-64
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interaction of class A G protein-coupled receptors with G protein.
Autorzy:
Ślusarz, Rafał
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1043328.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
GPCR class A
GPCR activation
G protein
Opis:
A model for interaction of class A G protein-coupled receptor with the G protein Gα subunit is proposed using the rhodopsin-transducin (RD/Gt) prototype. The model combines the resolved interactions/distances, essential in the active RD*/Gt system, with the structure of Gtα C-terminal peptide bound to RD* while stabilizing it. Assuming the interactions involve conserved parts of the partners, the model specifies the conserved Helix 2 non-polar X- - -X, Helix 3 DRY and Helix 7/8 NP- -Y- - F RD* motifs interacting with the Gtα C-terminal peptide, in compliance with the structure of the latter. A concomitant role of Gtα and Gtγ>C-termini in stabilizing RD* could possibly be resolved assuming a receptor dimer as requisite for G protein activation.
Źródło:
Acta Biochimica Polonica; 2004, 51, 1; 129-136
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protein modeling with reduced representation: statistical potentials and protein folding mechanism
Autorzy:
Ekonomiuk, Dariusz
Kielbasinski, Marcin
Kolinski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1041306.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
B1 domain of protein G
statistical potentials
folding mechanism
Monte Carlo simulations
high resolution lattice proteins
protein folding
Opis:
A high resolution reduced model of proteins is used in Monte Carlo dynamics studies of the folding mechanism of a small globular protein, the B1 immunoglobulin-binding domain of streptococcal protein G. It is shown that in order to reproduce the physics of the folding transition, the united atom based model requires a set of knowledge-based potentials mimicking the short-range conformational propensities and protein-like chain stiffness, a model of directional and cooperative hydrogen bonds, and properly designed knowledge-based potentials of the long-range interactions between the side groups. The folding of the model protein is cooperative and very fast. In a single trajectory, a number of folding/unfolding cycles were observed. Typically, the folding process is initiated by assembly of a native-like structure of the C-terminal hairpin. In the next stage the rest of the four-ribbon β-sheet folds. The slowest step of this pathway is the assembly of the central helix on the scaffold of the β-sheet.
Źródło:
Acta Biochimica Polonica; 2005, 52, 4; 741-748
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physiopathological Implications of 7TM Receptors
Autorzy:
Cygankiewicz, Adam I.
Powiązania:
https://bibliotekanauki.pl/articles/764827.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Seven-transmembrane receptors
G protein coupled receptors
pathology
cancer
Opis:
Seven-transmembrane (7TM) receptors are one of the most important proteins involved in perception of extracellular stimuli and regulation of variety of intracellular signaling pathways. Divergence of receptor types, their ligands and signaling pathways makes 7TM receptors important factors in pathology of many diseases. This review focused on the main diseases in which involvement of 7TM receptors was established e.g., retinitis pigmentosa, severe obesity, and dwarfism. Recent findings of aberrant expression of 7TM receptors in development of cancer were also summarized.
Źródło:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica; 2010, 6; 33-47
1730-2366
2083-8484
Pojawia się w:
Acta Universitatis Lodziensis. Folia Biologica et Oecologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A brief overview of the process of the elucidation of GnRH structure (1971)
Autorzy:
Kochman, K.
Powiązania:
https://bibliotekanauki.pl/articles/80024.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
luteinizing hormone
follicle stimulating hormone
receptor protein
protein G
cell membrane
hypothalamic peptide
adrenocorticotrophin
radioimmunoassay
central nervous system
gonadotrophin releasing hormone
receptor
neuroendocrinology
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2012, 93, 4
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arabidopsis thaliana Nudix hydrolase AtNUDT7 forms complexes with the regulatory RACK1A protein and Ggamma subunits of the signal transducing heterotrimeric G protein
Autorzy:
Olejnik, Kamil
Bucholc, Maria
Anielska-Mazur, Anna
Lipko, Agata
Kujawa, Martyna
Modzelan, Marta
Augustyn, Agnieszka
Kraszewska, Elzbieta
Powiązania:
https://bibliotekanauki.pl/articles/1039863.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein complexes
Nudix
AtNUDT7
Arabidopsis thaliana
heterotrimeric G protein
RACK1A
Opis:
Arabidopsis thaliana AtNUDT7 Nudix pyrophosphatase hydrolyzes NADH and ADP-ribose in vitro and is an important factor in the cellular response to diverse biotic and abiotic stresses. Several studies have shown that loss-of-function Atnudt7 mutant plants display many profound phenotypes. However the molecular mechanism of AtNUDT7 function remains elusive. To gain a better understanding of this hydrolase cellular role, proteins interacting with AtNUDT7 were identified. Using AtNUDT7 as a bait in an in vitro binding assay of proteins derived from cultured Arabidopsis cell extracts we identified the regulatory protein RACK1A as an AtNUDT7-interactor. RACK1A-AtNUDT7 interaction was confirmed in a yeast two-hybrid assay and in a pull-down assay and in Bimolecular Fluorescence Complementation (BiFC) analysis of the proteins transiently expressed in Arabidopsis protoplasts. However, no influence of RACK1A on AtNUDT7 hydrolase catalytic activity was observed. In vitro interaction between RACK1A and the AGG1 and AGG2 gamma subunits of the signal transducing heterotrimeric G protein was also detected and confirmed in BiFC assays. Moreover, association between AtNUDT7 and both AGG1 and AGG2 subunits was observed in Arabidopsis protoplasts, although binding of these proteins could not be detected in vitro. Based on the observed interactions we conclude that the AtNUDT7 Nudix hydrolase forms complexes in vitro and in vivo with regulatory proteins involved in signal transduction. Moreover, we provide the initial evidence that both signal transducing gamma subunits bind the regulatory RACK1A protein.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 609-616
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of small G proteins and their regulators.
Autorzy:
Paduch, Marcin
Jeleń, Filip
Otlewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1043851.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
small G protein
GAP
protein-protein interaction
GTPase
GDI
Rho
Ras
protein tertiary structure
GEF
Opis:
In recent years small G proteins have become an intensively studied group of regulatory GTP hydrolases involved in cell signaling. More than 100 small G proteins have been identified in eucaryotes from protozoan to human. The small G protein superfamily includes Ras, Rho Rab, Rac, Sar1/Arf and Ran homologs, which take part in numerous and diverse cellular processes, such as gene expression, cytoskeleton reorganization, microtubule organization, and vesicular and nuclear transport. These proteins share a common structural core, described as the G domain, and significant sequence similarity. In this paper we review the available data on G domain structure, together with a detailed analysis of the mechanism of action. We also present small G protein regulators: GTPase activating proteins that bind to a catalytic G domain and increase its low intrinsic hydrolase activity, GTPase dissociation inhibitors that stabilize the GDP-bound, inactive state of G proteins, and guanine nucleotide exchange factors that accelerate nucleotide exchange in response to cellular signals. Additionally, in this paper we describe some aspects of small G protein interactions with downstream effectors.
Źródło:
Acta Biochimica Polonica; 2001, 48, 4; 829-850
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypothetical orchestrated cooperation between dopaminergic and kinin receptors for the regulation of common functions
Autorzy:
Guevara-Lora, Ibeth
Niewiarowska-Sendo, Anna
Polit, Agnieszka
Kozik, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1038753.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
kinin receptors
dopamine receptors
G protein-coupled receptors
oligomerization
signaling pathways
Opis:
The G protein-coupled receptors (GPCRs), one of the largest protein families, are essential components of the most commonly used signal-transduction systems in cells. These receptors, often using common pathways, may cooperate in the regulation of signal transmission to the cell nucleus. Recent scientific interests increasingly focus on the cooperation between these receptors, particularly in a context of their oligomerization, e.g. the formation of dimers that are able to change characteristic signaling of each receptor. Numerous studies on kinin and dopamine receptors which belong to this family of receptors have shown new facts demonstrating their direct interactions with other GPCRs. In this review, current knowledge on signaling pathways and oligomerization of these receptors has been summarized. Owing to the fact that kinin and dopamine receptors are widely expressed in cell membranes where they act as mediators of numerous common physiological processes, the information presented here sheds new light on a putative crosstalk of these receptors and provides more comprehensive understanding of possible direct interactions that may change their functions. The determination of such interactions may be useful for the development of new targeted therapeutic strategies against many disorders in which kinin and dopamine receptors are involved.
Źródło:
Acta Biochimica Polonica; 2016, 63, 3; 387-396
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lysophosphatidic acids, cyclic phosphatidic acids and autotaxin as promissing targets in therapies of cancer and other diseases
Autorzy:
Gendaszewska-Darmach, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/1040734.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
autotaxin/NPP2
lysophosphatidic acid
cyclic phosphatidic acid
G protein-coupled receptors
Opis:
Lysophospholipids have long been recognized as membrane phospholipid metabolites, but only recently lysophosphatidic acids (LPA) have been demonstrated to act on specific G protein-coupled receptors. The widespread expression of LPA receptors and coupling to several classes of G proteins allow LPA-dependent regulation of numerous processes, such as vascular development, neurogenesis, wound healing, immunity, and cancerogenesis. Lysophosphatidic acids have been found to induce many of the hallmarks of cancer including cellular processes such as proliferation, survival, migration, invasion, and neovascularization. Furthermore, autotaxin (ATX), the main enzyme converting lysophosphatidylcholine into LPA was identified as a tumor cell autocrine motility factor. On the other hand, cyclic phosphatidic acids (naturally occurring analogs of LPA generated by ATX) have anti-proliferative activity and inhibit tumor cell invasion and metastasis. Research achievements of the past decade suggest implementation of preclinical and clinical evaluation of LPA and its analogs, LPA receptors, as well as autotaxin as potential therapeutic targets.
Źródło:
Acta Biochimica Polonica; 2008, 55, 2; 227-240
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guanylin and related peptides
Autorzy:
Beltowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/69588.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Fizjologiczne
Tematy:
gastrointestinal tract
lymphoguanylin
uroguanylin
peptide
guanylin
Escherichia coli
cystic fibrosis
protein kinase G
enterotoxin
diarrhea
Źródło:
Journal of Physiology and Pharmacology; 2001, 52, 3
0867-5910
Pojawia się w:
Journal of Physiology and Pharmacology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Targets for majority of drugs: G protein-coupled receptors - their structure and interaction with bioligands
Autorzy:
Ciarkowski, J.
Czaplewski, C.
Pasenkiewicz-Gierula, M.
Powiązania:
https://bibliotekanauki.pl/articles/1953953.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
G protein-coupled receptor
molecular modelling
GPCR/bioligand interaction
molecular dynamics
membrane
Opis:
G protein-coupled receptors (GPCRs) are the most frequent targets for many drugs. They form the largest superfamily of integral membrane proteins, of which more than 1000 members have the following common features: (i) All GPCRs form 7 hydrophobic a-helices of length ~38A (25 amino acids, 7 turns) along a single chain. The consecutive helices alternatively cross the membrane, starting from the extracellular side, so that they form a heptahelical transmembrane domain interwoven with 6 loops, of which the even ones plus the N-terminus create the receptor's extracellular domain while the odd ones plus the C-terminus form its intracellular domain. (ii) All GPCRs are stimulated by diverse extracellular (primary) signals. (iii) Stimulated GPCRs convey the primary signals via their transmembrane and intracellular domains to the cytosolic peripheral heterotrimeric GTP-binding proteins (G proteins), mediating the signal's further transduction to various cellular second messenger systems. A current status of structural studies on GPCRs, consisting of low ~7.5A resolution experimental structures and supplementary molecular modeling, is outlined. Subsequently, some results of authors' own work on studying essential interactions of the V2 vasopressin renal receptor (V2R) with its agonist [Arg8]Vasopressin (AVP) and selected antagonists are presented, as well as their possible impact on the biological signal transduction is discussed. Finally, perspectives for future developments are sketched.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 4; 583-599
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Receptory związane z białkami G w odporności wrodzonej bezkręgowców
G-protein-coupled receptors in invertebrate innate immunity
Autorzy:
Andrejko, Mariola
Mizerska-Kowalska, Magdalena
Zdzisińska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/1033991.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Przyrodników im. Kopernika
Tematy:
G-protein-coupled receptors (GPCRs)
innate immunity
invertebrate
bezkręgowce
odporność wrodzona
receptory związane z białkami G (GPCRs)
Opis:
Receptory związane z białkami G (GPCRs) stanowią najliczniejszą i bardzo zróżnicowaną grupę receptorów błonowych odpowiedzialnych za przekazywanie sygnałów ze środowiska zewnętrznego do wnętrza komórki. GPCRs uczestniczą niemal w każdym aspekcie życia organizmów, regulując m. in. mechanizmy związane z odpowiedzią immunologiczną, zarówno u kręgowców, jak i bezkręgowców. W pracy opisano ogólną budowę i klasyfikację GPCRs, mechanizmy aktywacji i przekazywania sygnału przez te receptory oraz sposoby regulacji ich aktywności. Ponadto zamieszczono podstawowe informacje na temat mechanizmów rozpoznawania patogenów przez bezkręgowce. W zasadniczej części pracy zaprezentowano wyniki najnowszych badań dotyczące zaangażowania GPCRs w reakcje obronne bezkręgowców, na przykładzie wybranych organizmów modelowych, tj. skrzypłocza atlantyckiego (Limulus polyphemus), muszki owocowej (Drosophila melanogaster) oraz nicienia (Caenorhabditis elegans).
The G-protein-coupled receptors (GPCRs) form the largest and most diverse group of membrane receptors engaged in extracellular signals transduction. GPCRs are involved in almost all aspects of vertebrates and invertebrates' life, including regulation of the immune response mechanisms. The paper describes the general structure and classification of GPCRs. Moreover, it presents the mechanisms of GPCR activation and signal transduction as well as the regulation of GPCR activity. Furthermore, basic information about the mechanisms of pathogen recognition by invertebrates is included. The main part of this review shows the most recent data about the involvement of GPCRs in defense mechanisms of invertebrates such as the horseshoe crab (Limulus polyphemus), fruit fly (Drosophila melanogaster), and nematode (Caenorhabditis elegans).
Źródło:
Kosmos; 2017, 66, 4; 553-562
0023-4249
Pojawia się w:
Kosmos
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polypharmacology – a challenge for current drug design approaches
Autorzy:
Podlewska, Sabina
Kurczab, Rafał
Powiązania:
https://bibliotekanauki.pl/articles/93192.pdf
Data publikacji:
2019
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
G protein-coupled receptor
polypharmacology
serotonin receptor
dopamine receptor
antipsychotic profile
ligand
receptor sprzężony z białkiem G
polifarmakologia
receptor serotoninowy
receptor dopaminowy
profil przeciwpsychotyczny
Opis:
Drug design process faces many challenges, and the most important ones are connected with side effects. Finding compounds that possess affinity towards target of interest is relatively simple; however, an approach one disease-one target is now making space for the search of polypharmacological ligands, where activity towards several proteins is considered at one time. Such proteins are not always the target ones, but very often such panels include also anti-targets, interaction with which is not desired, due to the side effects that may occur upon such contact. In the study, we examined ligands of four G protein-coupled receptors, forming antipsychotic profile: dopamine receptor D2, serotonin receptors 5-HT2A, 5-HT2C (anti-target), and 5-HT6. Number of ligands belonging to particular activity groups, as well as the selected compound structures are examined in detail. Also compound similarity between sets of different activity groups is analysed, giving a picture of difficulty of constructing molecular modeling methodologies that can help in the search of compounds with desired activity profile.
Źródło:
Science, Technology and Innovation; 2019, 6, 3; 19-23
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
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