Single Donor Research Articles

Aid Fragmentation and Corruption

Aid Fragmentation and Corruption

LA GREFFE DES CELLULES ADIPEUSES DANS LESTHETIQUE DE LA FACE: TECHNIQUE ET INDICATIONS

The objective of our study is to highlight the technique, the different indications, and the results of autologous fat grafting in facial aesthetics by reporting the experience of our department and through a literature review. This is a retrospective study involving 14 patients who underwent aesthetic and reparative facial fat grafting over a period of 2 years, from January 1, 2022, to January 1, 2024, at the Department of Plastic, Reconstructive, Aesthetic, and Burn Surgery of the Mohammed VI University Hospital Center in Marrakech. We collected 22 autologous facial fat grafts, with the mean age of our patients being 26.36 years, ranging from 11 to 58 years. A clear female predominance was noted (86.4%) with a female-to-male ratio of 6. The two main indications were atrophy and volume enhancement (72%) and contour refinement (28%). The procedures were performed under general anesthesia. The fat was harvested from a single donor site: the abdominal region. The mean volume harvested was 96.8 ml, ranging from 80 ml to 120 ml. All samples were centrifuged at a speed of 3,000 rpm for 3 minutes. The mean injected volume was 25.55 ml, ranging from 5 to 90 ml. 10% of the fat grafts were associated with a facelift. The average length of hospital stay was 1 day. None of our patients experienced immediate or late complications. 68% of patients underwent a single fat grafting session, 21% underwent 2 sessions, and only 11% required 3 sessions. The mean interval between sessions was 3 months. Subjective evaluation of satisfaction 3 months after the last intervention revealed a satisfaction rate of 90%. Adipose cell grafting is currently considered an ideal method for facial rejuvenation and reshaping due to its safety, simplicity, reproducibility, and the durable and natural results it achieves.

A tale of two kidneys, and the case for machine perfusion in South Africa.

Extended-criteria donors (ECDs) are seen as a means of addressing the shortfall in solid-organ availability for transplant. However, the use of ECD kidneys is associated with a greater risk of primary non-function compared with standard-criteria donor kidneys, and a higher discard rate has been described internationally. There seems to be a lack of consensus in the consideration of ECD kidneys for transplant, with reliance often placed on the subjective assessment of individual clinicians. The following case examines the difference in the institutional decision-making process applied to two kidneys from a single donor, and provides an argument for the use of hypothermic machine perfusion in low- to middle-income countries as an efficacious and objective means of assessing ECD kidney suitability.

Elaborate Modulating Binding Strength of Intermediates via Three-component Covalent Organic Frameworks for CO2 Reduction Reaction.

The catalytic performance for electrocatalytic CO2 reduction reaction (CO2RR) depends on the binding strength of the reactants and intermediates. Covalent organic frameworks (COFs) have been adopted to catalyze CO2RR, and their binding abilities are tuned via constructing donor-acceptor (DA) systems. However, most DA COFs have single donor and acceptor units, which caused wide-range but lacking accuracy in modulating the binding strength of intermediates. More elaborate regulation of the interactions with intermediates are necessary and challenge to construct high-efficiency catalysts. Herein, the three-component COF with D-A-A units was first constructed by introducing electron-rich diarylamine unit, electron-deficient benzothiazole and Co-porphyrin units. Compared with two-component COFs, the designed COF exhibit elevated electronic conductivity, enhanced reducibility, high efficiency charge transfer, further improving the electrocatalytic CO2RR performance with the faradic efficiency of 97.2 % at -0.8 V and high activity with the partial current density of 27.85 mA cm-2 at -1.0 V which exceed other two-component COFs. Theoretical calculations demonstrate that catalytic sites in three-component COF have suitable binding ability of the intermediates, which are benefit for formation of *COOH and desorption of *CO. This work offers valuable insights for the advancement of multi-component COFs, enabling modulated charge transfer to improve the CO2RR activity.

Elaborate Modulating Binding Strength of Intermediates via Three‐component Covalent Organic Frameworks for CO2 Reduction Reaction

AbstractThe catalytic performance for electrocatalytic CO2 reduction reaction (CO2RR) depends on the binding strength of the reactants and intermediates. Covalent organic frameworks (COFs) have been adopted to catalyze CO2RR, and their binding abilities are tuned via constructing donor‐acceptor (DA) systems. However, most DA COFs have single donor and acceptor units, which caused wide‐range but lacking accuracy in modulating the binding strength of intermediates. More elaborate regulation of the interactions with intermediates are necessary and challenge to construct high‐efficiency catalysts. Herein, the three‐component COF with D‐A‐A units was first constructed by introducing electron‐rich diarylamine unit, electron‐deficient benzothiazole and Co‐porphyrin units. Compared with two‐component COFs, the designed COF exhibit elevated electronic conductivity, enhanced reducibility, high efficiency charge transfer, further improving the electrocatalytic CO2RR performance with the faradic efficiency of 97.2 % at −0.8 V and high activity with the partial current density of 27.85 mA cm−2 at −1.0 V which exceed other two‐component COFs. Theoretical calculations demonstrate that catalytic sites in three‐component COF have suitable binding ability of the intermediates, which are benefit for formation of *COOH and desorption of *CO. This work offers valuable insights for the advancement of multi‐component COFs, enabling modulated charge transfer to improve the CO2RR activity.

Understanding the limitations of your assay using EQA data with serum creatinine as an example.

Laboratories need to take into consideration the specificity and imprecision of assays not only in verification, but also of quality assessment. This study investigates the composition of serum used in EQA materials by comparing material from a single and multiple donors (pooled material), across multiple methods, using creatinine as an example. Sixteen different serum matrices were distributed as 36 specimens through the UK NEQAS for Acute and Chronic Kidney Disease Scheme from March 2022 to March 2023. Male-only and female-only serum was used as single donations, pooled donations, unmanipulated or with addedexogenous creatinine. Specimens were distributed to primarily UK participants (approximately n=500) for creatinine analysis. Data has been reviewed by method compared to the enzymatic creatinine method principle mean. From the 16 different matrices, only the enzymatic creatinine assay systems from Roche Cobas and Siemens Atellica met the minimum acceptable bias goal, from biological data, of 5.6 %, in all specimens. Pooled material showed less variation in bias across all methods. Since Laboratories invest a lot of time and money in quality management, they need to know the limitations of their assays so that they are not investigating 'apparent' EQA/IQC problems which are purely due to non-specific, imprecise assay, rather than an analytical issuein their laboratory. When large numbers of individual donations are combined, interferents are essentially diluted out. Therefore, if EQA material is of this type it will be very difficult to determine the actual assay's bias and variability.

Descemet Stripping endothelial keratoplasty donor graft dissection following bowman-stromal Inlay preparation

This article outlines the dissection of donor grafts in descemet’s stripping endothelial keratoplasty (DSEK) after Bowman–Stromal inlay (BSI) tissue preparation. Following the femtosecond (FS) laser-assisted BSI for stromal augmentation in keratoconus, the donor cornea is transitioned to an artificial anterior chamber. The dissection of the DSEK graft is meticulously performed using blunt dissectors, considering the varying tissue thickness (thinner at the center and gradually thickening toward the periphery). This approach was successfully employed in three corneal donor tissues, facilitating six surgeries—three BSI and three DSEK. The intraoperative and postoperative courses were uneventful. This technique demonstrates the feasibility of utilizing a single donor tissue for both stromal augmentation and posterior lamellar keratoplasty (DSEK). Notably, the endothelial integrity of the donor tissue appears to remain unaltered following FS laser and subsequent manipulation by blunt dissectors. This holds promise in optimizing the utility of donor corneas for multiple therapeutic interventions.

Origin of discrete donor–acceptor pair transitions in 2D Ruddlesden–Popper perovskites

Two-dimensional (2D) van der Waals nanomaterials have attracted considerable attention for potential use in photonic and light–matter applications at the nanoscale. Thanks to their excitonic properties, 2D perovskites are also promising active materials to be included in devices working at room temperature. In this work, we study the presence of very narrow and spatially localized optical transitions in 2D lead halide perovskites by μ-photoluminescence and time-decay measurements. These discrete optical transitions are characterized by sub-millielectronvolt linewidths (≃120μeV) and long decay times (5–8 ns). X-ray photoemission and density-functional theory calculations have been employed to investigate the chemical origin of electronic states responsible of these transitions. The association of phenethylammonium with methylammonium cations into 2D Ruddlesden–Popper perovskites, (PEA)2(MA)n−1PbnI3n+1, particularly in phases with n≥2, has been identified as a mechanism of donor–acceptor pair (DAP) formation, corresponding to the displacement of lead atoms and their replacement by methylammonium. Ionized DAP recombination is identified as the most likely physical source of the observed discrete optical emission lines. The analysis of the experimental data with a simple model, which evaluates the Coulombic interaction between ionized acceptors and donors, returns a donor in Bohr radius of the order of ≃10 nm. The analysis of the spectral and electronic characteristics of these single donor–acceptor states in 2D perovskites is of particular importance both from the point of view of fundamental research, as well as to be able to link the emission of these states with new optoelectronic applications that require long-range optically controllable interactions.

Neonatal Blood Transfusion in Africa; Towards Optimizing Scarce Resource

Neonatal transfusion is a common practice in Africa, where many infants are born with low birth weight and require blood transfusions. The use of paediatric packs for neonatal blood transfusions has been recommended. However, the optimal use of these packs in Africa is not clearly understood by some healthcare practitioners. This review aims to provide insights into the optimal use of paediatric packs in neonatal transfusion in Africa.The World Health Organization (WHO) recommends restrictive transfusion practices for paediatric patients, including neonates, based on expert opinion. Transfusion triggers in neonates are controversial and mainly based on expert clinical opinion, although recent randomized controlled trials of ‘liberal’ versus ‘restrictive’ red cell transfusion policies in very low birth weight preterm babies are starting to influence clinical guidelines. Many neonatal red cell transfusions are given to replace losses from frequent blood sampling. This can be reduced by avoiding non-essential tests, using low-volume sample tubes, validated near patient testing, micro-techniques in the laboratory, and non-invasive monitoring where possible.The use of CMV-seronegative blood products for transfusion in low birth weight neonates is not deemed necessary. The primary rationale is that the risk of transfusion-transmitted infections should be reduced by stringent screening of donors, restrictive transfusion practice and certain interventions like irradiation of blood units before transfusion. A recent international survey of transfusion practices for extremely premature infants showed that factors considered “very important” regarding the need to administer blood transfusions included degree of oxygen requirement and need for respiratory support. Donor exposure can also be reduced by allocating single donor units, split into paedipacks, to babies predicted to need more than one transfusion episode within the expiry date of the donation. Implementing a program to improve compliance with neonatal intensive care unit transfusion guidelines was accompanied by a reduction in transfusion rate. The implementation of guidelines to improve compliance with neonatal intensive care unit transfusion guidelines can also reduce the transfusion rate.

Green emissive Tb(III) complexes based on photosensitizing antenna: Synthesis and optoelectronic analysis

Mononuclear octacoordinated ternary Tb(III) complexes involving 1,1,1-trifluoroacteylacetone (tfaa) as main ligand and monodentate or bidentate moieties as secondary ligand, were prepared. Tri-n-octyl phosphine oxide (TOPO) serves as a monodentate ligand with a single donor site (–O), while 1,10-phenanthroline and its derivatives function as bidentate ligands with –N as the donor atoms. The molecular stoichiometry and bonding environment about Tb(III) ion in synthesized samples were confirmed with the help of elemental analysis and the spectroscopic studies of FTIR and proton NMR, respectively. The octacoordinated arrangement around trivalent lanthanides was the outcome of their interactions occurs with oxygen donor sites in T1 and nitrogen sites in T2-T4. The optical investigation was concentrated on examining the absorption, excitation, emission and lifetime spectral data of the complexes. The dominating peak in Tb(III) complexes observed at around 545 nm is accountable for their green color. Thermogravimetric analysis demonstrates the stability of the complexes up to 150–250 °C. The synthesized complexes exhibit significant opto-electronic characteristics and large thermal stability, making them potentially suitable for lighting applications.

Assessment of Faecal Microbiota Transplant Stability in Deep-Freeze Conditions: A 12-Month ExVivo Viability Analysis.

Faecal microbiota transplantation (FMT) is an established treatment for Clostridioides difficile infection and is under investigation for other conditions. The availability of suitable donors and the logistics of fresh stool preparation present challenges, making frozen, biobanked stools an attractive alternative. This study aimed to evaluate the long-term viability of bacterial populations in faecal samples stored at -80°C for up to 12 months, supporting the feasibility of using frozen grafts for FMT. Fifteen faecal samples from nine healthy donors were processed, mixed with cryoprotectants and stored at -80°C. Samples were assessed at baseline and after 3, 6 and 12 months using quantitative culturing methods to determine the concentration of live bacteria. Quantitative analysis showed no significant decrease in bacterial viability over the 12-month period for both aerobic and anaerobic cultures (p = 0.09). At all timepoints, the coefficients of variability in colony-forming unit (CFU) counts were greater between samples (102 ± 21% and 100 ± 13% for aerobic and anaerobic cultures, respectively) than the variability between measurements of the same sample (30 ± 22% and 30 ± 19%). The study confirmed that faecal microbiota can be preserved with high viability in deep-freeze storage for up to a year, making allogenic FMT from biobanked samples a viable and safer option for patients. However, a multidonor approach may be beneficial to mitigate the risk of viability loss in any single donor sample.

Second issue

We would not have been able to present to you with the second issue of the Danish Journal of Obstetrics and Gynaecology (DJOG) without the support of our patrons, FYGO and DSOG. Their commitment has been instrumental in bringing this journal to fruition, and we extend our appreciation for their continued partnership. We still hope to provide researchers within the specialty of gynecology and obstetrics with a platform to disseminate their findings in our not-for-profit open-access journal. We believe in the power of knowledge sharing and collaboration to drive progress in healthcare, and it is our privilege to facilitate the exchange of ideas and discoveries within our community. We are grateful for the researchers who have entrusted DJOG with their invaluable contributions. We are honored to amplify your voices through our publication. Furthermore, we extend our deepest appreciation to the peer-reviewers who have dedicated their time and expertise to meticulously evaluate the submissions and provide constructive feedback. Your rigorous assessment has played a pivotal role in maintaining the quality and integrity of DJOG, ensuring that each published paper meets the high standards we and our editorial board aspire to. While we continue to work towards our goal of getting DJOG indexed by PubMed, we are committed to ensuring that our papers are discoverable through other means. All papers can be found on Google Scholar and are fully citable through CrossRef. Additionally, authors with free profiles on ResearchGate and ORCID have the opportunity to make their contributions visible there. In this issue, we are delighted to showcase a diverse selection of research articles that encompass the breadth and depth of gynecological practice. From interesting case studies within obstetrics, to a cohort study of hypertensive disorders in pregnancies comparing single and double gamete donation, epidemiological study of fertility outcomes after myomectomies, a prospective study of the effects of vaginal laser therapy for urogenital symptoms, study of sugar-dating among teenagers, and an insightful review exploring CIN or cancer after HPV vaccination, each paper holds relevance for readers interested in learning more about women’s health. Please enjoy all of these articles and more, including the invited editorial regarding sexual favors as merchandise among young teenagers, by our esteemed college Charlotte Wilken-Jensen.

High-throughput homogenous assay for the direct detection of Listeria monocytogenes DNA

The Amplified Luminescent Proximity Homogenous Assay-linked Immunosorbent Assay (AlphaLISA) is known for detecting various protein targets; however, its ability to detect nucleic acid sequences is not well established. Here, the capabilities of the AlphaLISA technology were expanded to include direct detection of DNA (aka: oligo-Alpha) and was applied to the detection of Listeria monocytogenes. Parameters were defined that allowed the newly developed oligo-Alpha to differentiate L. monocytogenes from other Listeria species through the use of only a single nucleotide polymorphism within the 16S rDNA region. Investigations into the applicability of this assay with different matrices demonstrated its utility in both milk and juice. One remarkable feature of the oligo-Alpha is that greater sensitivity could be achieved through the use of multiple acceptor oligos compared to only a single acceptor oligo, even when only a single donor oligo was employed. Additional acceptor oligos were easily incorporated into the assay and a tenfold change in the detection limit was readily achieved, with detection limits of 250 attomole of target being recorded. In summary, replacement of antibodies with oligonucleotides allows us to take advantage of genotypic difference(s), which both expands its repertoire of biological markers and furthers its use as a diagnostic tool.

Abstract 5334: Humanization of NOG mice and next-generation NOG strains to induce lineage-specific differentiation of immune cells for assessment of novel immune cell therapies, check point inhibitors, and immune cell engagers for translational immuno-oncology research

Abstract Background: The preclinical evaluation of novel immune therapies requires humanized immune system (HIS) mouse models. In previous studies we have demonstrated that either peripheral blood mononuclear cells (PBMC), subsets of PBMCs like T and NK cells or CD34+ hematopoietic stem cells (HSC) can be used to establish a HIS model. With the development of next-generation NOG mice, lineage-specific differentiation of immune cell sub-populations of interest can be supported. Transplantation of cell line-derived (CDX) or patient-derived (PDX) tumor xenografts on HIS mice provides a full model for human tumors for the investigation of checkpoint inhibitors (CPI), as well as novel cell therapies and immune cell engagers. Methods: HSC-humanized mice were generated by i.v. transplantation of CD34+ stem cells to immunodeficient mice. For humanization, NOG mice and next-generation NOG strains were used: NOG, NOG-EXL, hIL-2 NOG, hIL-6 NOG and FcResolv™ NOG mice were compared to each other for lineage-specific differentiation using single donors or a mixed HSC donor pool. Engraftment of immune cells was monitored by FACS analysis of blood every four weeks. In humanized NOG mice, CDX and PDX from different entities were s.c. transplanted and used to evaluate CPI. Results: Humanized hIL-2 NOG mice showed significantly decreased survival after HSC transplantation in comparison to the other mouse strains and had to be sacrificed within the first 6-8 weeks after HSC transplantation. In the other mouse strains, transplanted HSCs engrafted and differentiated mainly into B and T cells. NOG-EXL mice displayed the highest engraftment, with up to 80% of human cells in the blood, including a higher portion of myeloid cells. In humanized hIL-6 NOG mice a higher portion of monocytes could be determined. FcResolv™ NOG mice lack murine Fc gamma receptors in order to reduce confounding interactions between residual murine immune cells and antibody-based therapies, and they engraft and differentiate human HSCs similarly to the parent NOG strain. In humanized NOG mice, selected CDX and PDX tumors successfully engrafted without significant differences in tumor growth compared to non-humanized mice. CPI treatments induced tumor growth delay in selected models. Conclusions: Next-generation NOG mouse strains are characterized by a lineage-specific differentiation of immune cells depending on integrated human cytokines. Furthermore, we established a human tumor-immune-cell model for NOG mice using different entities of CDX or PDX in combination with CPI. Our human tumor-immune cell models allow preclinical translational studies on tumor immune biology as well as evaluation of new therapies, drug combinations and biomarker identification and validation. Citation Format: Maria Stecklum, Louise Baskin, Jens Hoffmann. Humanization of NOG mice and next-generation NOG strains to induce lineage-specific differentiation of immune cells for assessment of novel immune cell therapies, check point inhibitors, and immune cell engagers for translational immuno-oncology research [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 5334.

A study of the relationship of the dynamics of development and characteristics of chimerism with manifestations of graft-vs.-host disease in the organs of mice after allogeneic transplantation of whole bone marrow

In the сlinical practice, allogeneiс bone marrow transplantation (BMT) is often cause of the graft-versus-host disease (GvHD). GvHD is explained by the fact that T-lymphocytes, which are administered simultaneously with hematopoietic cells during transplantation and after then formed and matured in the timus of the recipient from donor progenitor cells, recognize and attack the cells of the host. However, a complete explanation of the phenomenon of the GvHD does not exists, and the chimerization of the recipient’s organism as a possible cause of damage of its organs is not taken into account. Therefore, the aim of this work was the modeling of allogeneic transplantation of the whole bone marrow (BM, experiment) and comparing its results with syngeneic transplantation (control) basing on the investigation of engraftment of cells of donor origin in the main GvHD target organs. Bone marrow (BM) donors were Tg(ACTB-EGFP)1Osb/J mice carrying a green fluorescent protein gene (EGFP), recipients were the animal of CBA and C57BL/6 inbred strains with age 2–10 months. 1 day before BMT (1.5×107 cells per mouse) all recipients were irradiated at a dose of 6.5 Gy (LD 50/30). After 1, 3, 5, 7, 11, 14, 21, 28, 35 and 55 days the development of chimerism in the liver, skin and colon of animals was examined using a fluorescent microscope. Already in 1 day, single fibroblast-like donor cells were found in the colon, in 7 days – in the skin and liver. 14–28 days after BMT, with donor cells mainly stroma in the liver, in the skin fibroblasts and keratinocytes were formed, in the colon villous cells and also stromal and parenchymal cells of Peyer’s patches which were died off after irradiation were substituted. Unlike control, in the experimental groups GFP+ giant fibroblasts about 30 mkm in length were found in the stroma of the liver, in the skin and in the colon; in the liver there was a lot of GFP+-bulkheads and fibroblast-like Ito’s cells of a very intricate configuration. To 35–55 days after allogeneic BMT cells of the donor origin in the liver and in the villi of the colon began to destroy, the villi became overgrown with GFP+-connective tissue cells and warped, wall of the colon became thin and the skin was fully substituted with a new one (all these things were never observed in the conrol groups). We propose a hypothesis that beside with GvHD traits like thinning of the colon wall and plenty of roundish GFP+-cells on inner surface of the skin, other signs of the studied after allogeneic BMT organs suggest that the cells of the organs which are formed from mesenchymal stem cells of the whole bone marrow become target for the recipient’s T-cells, i.e. suggest existence of host-versus-graft (HVG) reaction. Obvious manifestation of immune reactions after BMT directly coincides with the term of massive engraftment of the studied organs with cells of donor origin and restoration of the host’s own immune system, i.e. the development of chimerism determines the development of organ damage. This explains the events of GvHD from medical practice – atrophy of the mucous membranes, excess production of collagen, sclerosis of the bile ducts, skin damage, colitis – and the timing of its manifestation.

Evaluation and post-transplant management of children after multi-organ-with-kidney transplantation.

Multi-organ transplantation involves the transplant of two or more organs from a single donor into a single recipient; in most cases, one of these organs is a kidney. Multi-organ transplantation is uncommon in pediatric transplantation but can be life-saving or significantly life-improving for children with rare diseases, including primary heart, liver, pancreas, or intestinal failure with secondary kidney failure, metabolic disorders, and genetic conditions causing multi-organ dysfunction. This manuscript reviews the current state of pediatric multi-organ transplantation that includes a kidney, with a focus on indications, evaluation, and key differences in management compared to kidney-alone transplantation. Guidelines and consensus statements for pediatric multi-organ transplantation are nonexistent; this review condenses reported statistics and peer-reviewed expert opinion while highlighting areas in need of further research.

In platelet single donor apheresis, platelet factor 4 levels correlated with donor's age and decreased during storage.

The human population is ageing worldwide. The World Health Organization estimated that the world's population of people aged60years and older will increase to at least 30%, coinciding with a growing frequency of cognitive and cardiovascular disease. Recently, in preclinical studies platelet Factor 4 (PF4) was presented as a pro-cognitive factor. This molecule is released by platelets in the circulation and could be present in blood products destined for transfusion. We wondered if PF4 levels are correlated to the age of the blood donor or to the storage time of platelet concentrates (PCs) intended for transfusion? We observed higher levels of PF4 in PCs from elderly donors compared to younger donors, while PC storage time did not determine PF4 levels expression.

Abstract A103: Improved cell phenotyping of ovarian cancer tumor microenvironment

Abstract Introduction: Multiplexed imaging at single-cell resolution is becoming widely used to decipher the role of the cellular microenvironment in cancer and other complex diseases. To identify spatial patterns of single cells on a tissue, accurate cell-type phenotyping is a crucial step. We present Tribus, an interactive, semi-supervised classifier that avoids thresholds and manual labeling, with user-friendly visualization of the results and automated quality control reports. Materials and Methods: We developed Tribus, an open-source Python 3 software utilizing self-organizing maps for data clustering with an integrated Napari plug-in for fast visualization. It assigns the cell phenotypes based on user-defined label description tables and median marker expressions, following a hierarchical structure to minimize overspill bias. It has a modular architecture and can be run via command line, Jupyter Notebook, or the Napari interface. For exploring the Tribus performance, we used 1) manually expert annotated datasets with different tissue origins 2) dataset with cluster-based annotation 3) previously unpublished dataset. To ensure usability, we utilized datasets generated by using different multiplexed imaging technologies, and of variable size including large tissue microarrays and whole-slide images. Results: Using Tribus we accurately annotated the cell phenotypes in an expert-labeled Co-detection by indexing (CODEX) dataset, consisting of 8 regions of tissue samples from a single donor, including both healthy colon and small bowel sections. Tribus analysis of a high-grade ovarian cancer (HGSC) tumor microarray dataset generated by tCyCIF revealed a subset of lymphoid cells previously mislabelled using a cluster annotation approach. Finally, we utilized Tribus for deep cell phenotyping on a large whole-slide image tCyCIF dataset consisting of over a million cells from five matched HGSC samples collected before and after neoadjuvant chemotherapy (NACT). In the paired samples we successfully identified cell subtypes crucial for immune surveillance. Our analysis accurately differentiated M1 and M2 macrophage subpopulations. In addition, the analyzed post-NACT samples showed a higher proportion of tumor-infiltrating CD8+ T-cells, interestingly displaying occasional spatial clusters by the tumor borders. Therefore, Tribus has shown a great potential to study the spatial patterns and cell-cell interactions of relevant immune cells in response to neoadjuvant chemotherapy treatment. Conclusion: Overall, Tribus is an accurate, fast and efficient way to analyze different sizes of datasets across different technologies, resulting in accelerated analysis of the spatial tumor microenvironment (TME). The accurate cell-type phenotyping with Tribus uncovered high-resolution cellular phenotypes and their spatial patterns in the TME in ovarian cancer after neoadjuvant chemotherapy. Citation Format: Ziqi Kang, Teodora Farago, Angela Szabo, Inga-Maria Launonen, Fernando Perez, Ella Anttila, Kevin Elias, Julia Casado, Peter Sorger, Anniina Färkkilä. Improved cell phenotyping of ovarian cancer tumor microenvironment [abstract]. In: Proceedings of the AACR Special Conference on Ovarian Cancer; 2023 Oct 5-7; Boston, Massachusetts. Philadelphia (PA): AACR; Cancer Res 2024;84(5 Suppl_2):Abstract nr A103.

Design and Exploration by Quantum Chemical Analysis of Photosensitizers Having [D-π-π-A]- and [D-D-triad-A]-Type Molecular Structure Models for DSSC.

Density functional theory (DFT) calculations are performed on the newly developed and designed photosensitizers having [D-D-triad-A]- and [D-π-π-A]-type structural models for near-infrared absorption dye-sensitized solar cells (DSSCs). For this purpose, three novel molecules are designed, which are named as follows: [naphthalene-anthracene-thiophene-furan-benzonitrile] as dye S1, [coronene-anthracene-thiophene-furan-benzonitrile] as dye S2, and [fluorene-thiophene-furan-benzonitrile] as dye S3. In all three systems, benzonitrile is the acceptor moiety, while thiophene and furan are bridging moieties. Naphthalene and anthracene are donor moieties in S1, whereas coronene and anthracene are donor moieties in S2, and fluorene is the only single donor moiety used for designing the dye complex S3. All three dye complexes are optimized under the DFT framework by using the B3LYP hybrid functional with 6-31G(d,p) basis set on Gaussian 16W software. The absorption spectra are calculated utilizing time-dependent density functional theory (TD-DFT) with the CAM-B3LYP/6-31G(d,p) basis set. The calculated absorption maxima of S1 and S2 are 749.45 and 750.04 nm, respectively, while for S3, it is reported to be at 337.35 nm, which suggests that the designed molecular structure having a double-donor moiety is suitable for high absorption wavelength. Further, the analysis of frontier molecular orbital energy gap suggests that the molecular systems S1, S2, and S3 have values 2.17, 2.13, and 3.618 eV, respectively, which lie in the semiconducting region. The other parameters calculated for the photovoltaic performance are exciton binding energy, change in free energy of charge regeneration, change in free energy of charge injection, oscillator strength, light harvesting efficiency, and open-circuit voltage.

Comparative Analysis of Dental Stem Cells from a Single Donor: Differences in Adipogenic Differentiation and Protein Profile

Dental stem cells (DSCs) are multipotent cells with high proliferation capacity and multilineage differentiation. Few studies have compared the cellular characteristics and adipogenic differentiation potential of DSCs derived from tissues of the same individual. The objective of this work was to evaluate the differences in growth characteristics, expression of mesenchymal stem cells (MSCs)-specific markers,
 and the proteomic profile in response to adipogenic differentiation, of dental pulp and periodontal ligament cells obtained from a single donor. Dental cells were isolated from the third molar of a single donor using the outgrowth method. To obtain the proliferation curve of the cells was evaluated by trypan blue analysis. After the cells were cultured in adipogenic medium, morphological changes were monitored by oil red O staining, as well as adipogenic markers PPARγ and adiponectin by RT-qPCR. Finally, a two-dimensional electrophoresis of the proteins isolated from these cells was performed to analyze the proteomic profile. The two types of DSCs share similar cellular characteristics; however, their capacity for adipogenic differentiation is different. Based on the protein profiling results, we identified five differentially expressed proteins between both types of stem cells. Our findings showed that dental pulp and periodontal ligament stem cells from a single donor have similar cellular characteristics but a different response to adipogenesis, which would explain the differences in the expression of their proteins.