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Article ; Online: Sub-Micro Organosolv Lignin as Bio-Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive.

Pappa, Christina P / Torofias, Stylianos / Triantafyllidis, Konstantinos S

ChemSusChem

2023 Volume 16, Issue 13, Page(s) e202300076

Abstract: Sub-micro organosolv lignin (OBs) isolated from beechwood biomass, comprising of sub-micro sized particles (570 nm) with low molecular weight and dispersity and relatively high total phenolic -OH content, is utilized for the production of bio-based epoxy ...

Abstract	Sub-micro organosolv lignin (OBs) isolated from beechwood biomass, comprising of sub-micro sized particles (570 nm) with low molecular weight and dispersity and relatively high total phenolic -OH content, is utilized for the production of bio-based epoxy polymer composites. OBs lignin is incorporated into the glassy epoxy system based on diglycidyl ether of bisphenol A (DGEBA) and aliphatic polyoxypropylene α,ω-diamine (Jeffamine D-230), being utilized both as a curing agent, partially replacing D-230, and as an additive, substituting part of both petroleum-derived components. Up to 12 wt % replacement of D-230 by OBs lignin is achieved, whereas approximately 17 wt % of OBs effectively replaces the conventional epoxy polymer. The incorporation of OBs lignin in the polymeric matrix is achieved without the use of any solvent or previous functionalization. Enhanced properties are obtained, with substantial increases in tensile strength, strain, stiffness, glass transition temperature, antioxidant activity, and resistance to solvents.
MeSH term(s)	Lignin ; Temperature ; Polymers ; Tensile Strength ; Solvents ; Epoxy Resins
Chemical Substances	Lignin (9005-53-2) ; Polymers ; Solvents ; Epoxy Resins
Language	English
Publishing date	2023-05-02
Publishing country	Germany
Document type	Journal Article
ISSN	1864-564X
ISSN (online)	1864-564X
DOI	10.1002/cssc.202300076
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Kraft (Nano)Lignin as Reactive Additive in Epoxy Polymer Bio-Composites.

Pappa, Christina P / Cailotto, Simone / Gigli, Matteo / Crestini, Claudia / Triantafyllidis, Konstantinos S

Polymers

2024 Volume 16, Issue 4

Abstract: The demand for high-performance bio-based materials towards achieving more sustainable manufacturing and circular economy models is growing significantly. Kraft lignin (KL) is an abundant and highly functional aromatic/phenolic biopolymer, being the main ...

Abstract	The demand for high-performance bio-based materials towards achieving more sustainable manufacturing and circular economy models is growing significantly. Kraft lignin (KL) is an abundant and highly functional aromatic/phenolic biopolymer, being the main side product of the pulp and paper industry, as well as of the more recent 2nd generation biorefineries. In this study, KL was incorporated into a glassy epoxy system based on the diglycidyl ether of bisphenol A (DGEBA) and an amine curing agent (Jeffamine D-230), being utilized as partial replacement of the curing agent and the DGEBA prepolymer or as a reactive additive. A D-230 replacement by pristine (unmodified) KL of up to 14 wt.% was achieved while KL-epoxy composites with up to 30 wt.% KL exhibited similar thermo-mechanical properties and substantially enhanced antioxidant properties compared to the neat epoxy polymer. Additionally, the effect of the KL particle size was investigated. Ball-milled kraft lignin (BMKL, 10 μm) and nano-lignin (NLH, 220 nm) were, respectively, obtained after ball milling and ultrasonication and were studied as additives in the same epoxy system. Significantly improved dispersion and thermo-mechanical properties were obtained, mainly with nano-lignin, which exhibited fully transparent lignin-epoxy composites with higher tensile strength, storage modulus and glass transition temperature, even at 30 wt.% loadings. Lastly, KL lignin was glycidylized (GKL) and utilized as a bio-based epoxy prepolymer, achieving up to 38 wt.% replacement of fossil-based DGEBA. The GKL composites exhibited improved thermo-mechanical properties and transparency. All lignins were extensively characterized using NMR, TGA, GPC, and DLS techniques to correlate and justify the epoxy polymer characterization results.
Language	English
Publishing date	2024-02-18
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym16040553
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Article: The Effect of Nanobubbles on Transdermal Applications.

Mitropoulos, Athanasios Ch / Pappa, Christina / Kosheleva, Ramonna I / Kyzas, George Z

Nanomaterials (Basel, Switzerland)

2023 Volume 13, Issue 18

Abstract: In the present work, a new method for dermal delivery using nanobubbles (NBs) is investigated. Oxygen NBs are generated in deionized water and used to produce cosmetic formulations with hyaluronic acid as an active ingredient. Nanobubbles result in the ... ...

Abstract	In the present work, a new method for dermal delivery using nanobubbles (NBs) is investigated. Oxygen NBs are generated in deionized water and used to produce cosmetic formulations with hyaluronic acid as an active ingredient. Nanobubbles result in the improvement of the effect and penetration of the active ingredient through Strat-M, a synthetic membrane that resembles human skin. Experiments conducted with the Franz Cell device confirm the greater penetration of the active ingredient into Strat-M due to NBs, compared to cosmetic formulations that do not contain NBs. The effect of NBs was further examined by measuring UV-Vis and FTIR spectra. A possible mechanism was outlined, too. It was also found that NBs do not change the pH or the FTIR spectrum of the cosmetic serum indicating non-toxicity.
Language	English
Publishing date	2023-09-20
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano13182600
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Article ; Online: Late presentation during the COVID-19 pandemic of severe procidentia: a high-grade poorly differentiated sarcoma of unknown origin.

Pappa, Christina / Smyth, Sarah Louise / Soleymani Majd, Hooman

BMJ case reports

2022 Volume 15, Issue 2

Abstract: High-grade poorly differentiated sarcomas of unknown primary origin constitute a rare entity and are characterised by wide histopathological diversity and atypical presentations. We present such an unusual case attending with severe procidentia in a 68- ... ...

Abstract	High-grade poorly differentiated sarcomas of unknown primary origin constitute a rare entity and are characterised by wide histopathological diversity and atypical presentations. We present such an unusual case attending with severe procidentia in a 68-year-old postmenopausal female. On review of the literature, there are no similar cases reported. Herein, we present this case as in view of its rare clinical appearance combined with the advanced and histologically uncertain nature of the tumour, which raised significant challenges regarding diagnosis and surgical management in considerations of oncological hygiene and risk of tumour spillage. This was further potentiated by delay in diagnosis and treatment due to the COVID-19 pandemic.
MeSH term(s)	Aged ; COVID-19 ; Female ; Humans ; Pandemics ; SARS-CoV-2 ; Sarcoma/diagnosis
Language	English
Publishing date	2022-02-09
Publishing country	England
Document type	Case Reports ; Journal Article
ISSN	1757-790X
ISSN (online)	1757-790X
DOI	10.1136/bcr-2021-246710
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Book ; Online ; Thesis: Evolving Technology Education in Primary Schools: A Two-Decade Journey Through a Systematic Review and Teacher Insights

Pappa, Christina Ioanna Verfasser] / [Pittich, Daniel [Akademischer Betreuer] / Riedl, Alfred Gutachter] / [Pittich, Daniel [Gutachter] / Georgiou, Despoina [Gutachter]

2024

Author's details	Christina Ioanna Pappa ; Gutachter: Alfred Riedl, Daniel Pittich, Despoina Georgiou ; Betreuer: Daniel Pittich
Keywords	Erziehung, Schul- und Bildungswesen ; Education
Subject code	sg370
Language	English
Publisher	Universitätsbibliothek der TU München
Publishing place	München
Document type	Book ; Online ; Thesis
Database	Digital theses on the web

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Article ; Online: Augmented oxidative stress, accumulation of DNA damage and impaired DNA repair mechanisms in thrombotic primary antiphospholipid syndrome.

Pappa, Maria / Ntouros, Panagiotis A / Papanikolaou, Christina / Sfikakis, Petros P / Souliotis, Vassilis L / Tektonidou, Maria G

Clinical immunology (Orlando, Fla.)

2023 Volume 254, Page(s) 109693

Abstract: Antiphospholipid syndrome (APS) is a rare autoimmune disorder with complex pathogenesis. Studies have shown that oxidative stress may contribute to APS pathophysiology. In peripheral blood mononuclear cells (PBMCs) from thrombotic Primary APS (thrPAPS) ... ...

Abstract	Antiphospholipid syndrome (APS) is a rare autoimmune disorder with complex pathogenesis. Studies have shown that oxidative stress may contribute to APS pathophysiology. In peripheral blood mononuclear cells (PBMCs) from thrombotic Primary APS (thrPAPS) patients and age/sex-matched healthy controls (HC), as well as a control group of asymptomatic antiphospholipid antibody (aPL) positive individuals without APS (aPL+/non-APS), we examined oxidative stress, abasic (apurinic/apyrimidinic) sites, and DNA damage response (DDR)-associated parameters, including endogenous DNA damage (single- and double-strand breaks) and DNA repair mechanisms, namely nucleotide excision repair (NER) and double-strand breaks repair (DSB/R). We found that thrPAPS patients exhibited significantly higher levels of endogenous DNA damage, increased oxidative stress and abasic sites, as well as lower NER and DSB/R capacities versus HC (all P < 0.001) and versus aPL+/non-APS subjects (all P < 0.05). Our findings demonstrate that oxidative stress and decreased DNA repair mechanisms contribute to the accumulation of endogenous DNA damage in PBMCs from thrPAPS patients and, if further validated, may be exploited as therapeutic targets and potential biomarkers.
MeSH term(s)	Humans ; Antiphospholipid Syndrome ; Leukocytes, Mononuclear ; DNA Repair ; Oxidative Stress ; Thrombosis/etiology ; DNA Damage
Language	English
Publishing date	2023-07-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	1459903-x
ISSN	1521-7035 ; 1521-6616
ISSN (online)	1521-7035
ISSN	1521-6616
DOI	10.1016/j.clim.2023.109693
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Article ; Online: Effect of fixed-dose combination of insulin degludec and liraglutide on apoB-containing lipoprotein subclasses and HDL lipidome in type 2 diabetes.

Pappa, Eleni / Kostara, Christina / Bairaktari, Eleni / Arvaniti, Eleni / Tsimihodimos, Vasilis

Journal of diabetes and its complications

2022 Volume 36, Issue 10, Page(s) 108286

Abstract: Aims: Administration of insulin degludec and liraglutide (IDegLira) correlates to fasting lipid profile changes of diabetic patients, while data concerning apoB-containing lipoprotein subclasses and HDL lipidome are scarce. We evaluated its effect on ... ...

Abstract	Aims: Administration of insulin degludec and liraglutide (IDegLira) correlates to fasting lipid profile changes of diabetic patients, while data concerning apoB-containing lipoprotein subclasses and HDL lipidome are scarce. We evaluated its effect on fasting lipid parameters, apolipoproteins, apoB-containing lipoprotein subclasses and HDL lipidome in patients with type 2 diabetes. Methods: Sixty three patients with HbA1c > 7 % on oral glucose-lowering drugs received either IDegLira or insulin degludec for 3 months. Lipoprotein subfraction profile was determined through Lipoprint method, whereas HDL lipid composition via Results: Compared to insulin degludec, IDegLira administration resulted in significantly greater reduction of total and LDL-cholesterol. On the other hand, the effect of the two drugs on apolipoprotein-B-containing lipoprotein subfractions concentration was minimal and did not differ between the 2 interventions. IDegLira, but not insulin degludec, induced an atheroprotective shift in HDL's fatty acid composition and particle core depletion in triglycerides. Conclusions: IDegLira administration is accompanied by total and LDL-cholesterol reduction, while sdLDL concentration only reduced in patients experiencing triglyceride reduction. IDegLira induced compositional changes of HDL particles. These changes may contribute to the cardioprotective properties of liraglutide.
MeSH term(s)	Apolipoproteins B ; Blood Glucose ; Cholesterol, LDL ; Diabetes Mellitus, Type 2/drug therapy ; Fatty Acids ; Glucose ; Glycated Hemoglobin A/analysis ; Humans ; Hypoglycemic Agents/therapeutic use ; Insulin, Long-Acting ; Lipidomics ; Lipoproteins ; Liraglutide/adverse effects ; Triglycerides
Chemical Substances	Apolipoproteins B ; Blood Glucose ; Cholesterol, LDL ; Fatty Acids ; Glycated Hemoglobin A ; Hypoglycemic Agents ; Insulin, Long-Acting ; Lipoproteins ; Triglycerides ; insulin degludec (54Q18076QB) ; Liraglutide (839I73S42A) ; Glucose (IY9XDZ35W2)
Language	English
Publishing date	2022-08-18
Publishing country	United States
Document type	Journal Article
ZDB-ID	1105840-7
ISSN	1873-460X ; 1056-8727
ISSN (online)	1873-460X
ISSN	1056-8727
DOI	10.1016/j.jdiacomp.2022.108286
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Article ; Conference proceedings: Gestational diabetes mellitus is associated with activation of circulating innate lymphoid cells

Schlickeiser, Stephan / Sbierski-Kind, Julia / Semeia, Lorenzo / Ferrari, Uta / Harada, Saori / Pappa, Eleni / Gar, Christina / Lechner, Andreas / Seissler, Jochen

Diabetologie und Stoffwechsel

(Diabetes Kongress 2024 – 58. Jahrestagung der DDG)

2024 Volume 19, Issue S 01

Event/congress	Diabetes. Umwelt. Leben. Perspektiven aus allen Blickwinkeln, CityCube Berlin, 2024-05-08
Series title	Diabetes Kongress 2024 – 58. Jahrestagung der DDG
Language	German
Publishing date	2024-04-01
Publisher	Georg Thieme Verlag KG
Publishing place	Stuttgart ; New York
Document type	Article ; Conference proceedings
ZDB-ID	2222993-0
ISSN	1861-9010 ; 1861-9002
ISSN (online)	1861-9010
ISSN	1861-9002
DOI	10.1055/s-0044-1785247
Database	Thieme publisher's database

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Article ; Online: Ultrasonography of the scrotum: Revisiting a classic technique.

Tsili, Athina C / Bougia, Christina K / Pappa, Ourania / Argyropoulou, Maria I

European journal of radiology

2021 Volume 145, Page(s) 110000

Abstract: Conventional US is the primary imaging modality for the evaluation of the scrotum, due to its high resolution, availability, cost-effectiveness and absence of ionizing radiation. Grayscale and color Doppler US provide a comprehensive assessment of ... ...

Abstract	Conventional US is the primary imaging modality for the evaluation of the scrotum, due to its high resolution, availability, cost-effectiveness and absence of ionizing radiation. Grayscale and color Doppler US provide a comprehensive assessment of scrotal diseases. The technique represents the mainstay for imaging of acute scrotum. US is highly accurate in the detection, localization and characterization of scrotal masses. Multiparametric US, including conventional US, contrast-enhanced US and tissue elastography has improved the diagnostic performance of the technique in the assessment of testicular diseases. MRI represents a valuable supplemental imaging tool for the investigation of scrotal pathology, mainly recommended in cases of indeterminate US findings. Recommendations recently issued by the European Society of Urogenital Radiology Scrotal and Penile Imaging Working Group (ESUR-SPIWG) refer to the use of scrotal sonography for the evaluation of pathologic entities, including testicular microlithiasis, small, non-palpable incidentally detected testicular masses, varicocele and scrotal trauma. In this review, the technical specifications for scrotal US and the normal sonographic findings are presented. Grayscale and color Doppler US findings of common acute scrotal diseases and scrotal masses are discussed. The complimentary role of multiparametric US and scrotal MRI is addressed. ESUR-SPIWG's guidelines are also reviewed.
MeSH term(s)	Genital Diseases, Male ; Humans ; Magnetic Resonance Imaging ; Male ; Penis/diagnostic imaging ; Scrotum/diagnostic imaging ; Ultrasonography
Language	English
Publishing date	2021-10-23
Publishing country	Ireland
Document type	Journal Article ; Review
ZDB-ID	138815-0
ISSN	1872-7727 ; 0720-048X
ISSN (online)	1872-7727
ISSN	0720-048X
DOI	10.1016/j.ejrad.2021.110000
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Article: An Overview of the Role of Multiparametric MRI in the Investigation of Testicular Tumors.

Tsili, Athina C / Sofikitis, Nikolaos / Pappa, Ourania / Bougia, Christina K / Argyropoulou, Maria I

Cancers

2022 Volume 14, Issue 16

Abstract: Conventional ultrasonography represents the mainstay of testis imaging. In cases in which ultrasonography is inconclusive, scrotal MRI using a multiparametric protocol may be used as a useful problem-solving tool. MRI of the scrotum is primarily ... ...

Abstract	Conventional ultrasonography represents the mainstay of testis imaging. In cases in which ultrasonography is inconclusive, scrotal MRI using a multiparametric protocol may be used as a useful problem-solving tool. MRI of the scrotum is primarily recommended for differentiating between benign and malignant testicular masses when sonographic findings are ambiguous. This technique is also accurate in the preoperative local staging of testicular tumors and, therefore, is recommended in patients scheduled for testis-sparing surgery. In addition, MRI may provide valuable information regarding the histological characterization of testicular germ-cell tumors, in selected cases. Scrotal MRI may also help in the differentiation between testicular germ-cell neoplasms and non-germ-cell neoplasms. Axial T1-weighted imaging, axial and coronal T2-weighted imaging, axial diffusion-weighted imaging, and coronal subtracted dynamic contrast-enhanced imaging are the minimum requirements for scrotal MRI. A variety of MRI techniques-including diffusion tensor imaging, magnetization transfer imaging, proton MR spectroscopy, volumetric apparent diffusion coefficient histogram analysis, and MRI-based radiomics-are being investigated for testicular mass characterization, providing valuable supplementary diagnostic information. In the present review, we aim to discuss clinical indications for scrotal MRI in cases of testicular tumors, along with MRI findings of common testicular malignancies.
Language	English
Publishing date	2022-08-13
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2527080-1
ISSN	2072-6694
ISSN	2072-6694
DOI	10.3390/cancers14163912
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