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Microorganisms not only contribute to the spoilage of food but can also cause illnesses through consumption. Consumer concerns and doubts about the shelf life of the products and the resulting enormous amounts of food waste have led to a demand for a rapid, robust, and non-destructive method for the detection of microorganisms, especially in the food sector. Therefore, a rapid and simple sampling method for the Raman- and infrared (IR)-microspectroscopic study of microorganisms associated with spoilage processes was developed. For subsequent evaluation pre-processing routines, as well as chemometric models for classification of spoilage microorganisms were developed. The microbiological samples are taken using a disinfectable sampling stamp and measured by microspectroscopy without the usual pre-treatments such as purification separation, washing, and centrifugation. The resulting complex multivariate data sets were pre-processed, reduced by principal component analysis, and classified by discriminant analysis. Classification of independent unlabeled test data showed that microorganisms could be classified at genus, species, and strain levels with an accuracy of 96.5 % (Raman) and 94.5 % (IR), respectively, despite large biological differences and novel sampling strategies. As bacteria are exposed to constantly changing conditions and their adaptation mechanisms may make them inaccessible to conventional measurement methods, the methods and models developed were investigated for their suitability for microorganisms exposed to stress. Compared to normal growth conditions, spectral changes in lipids, polysaccharides, nucleic acids, and proteins were observed in microorganisms exposed to stress. Models were developed to discriminate microorganisms, independent of the involvement of various stress factors and storage times. Classification of the investigated bacteria yielded accuracies of 97.6 % (Raman) and 96.6 % (IR), respectively, and a robust and meaningful model was developed to discriminate different microorganisms at the genus, species, and strain levels. The obtained results are very promising and show that the methods and models developed for the discrimination of microorganisms as well as the investigation of stress factors on microorganisms by means of Raman- and IR-microspectroscopy have the potential to be used, for example, in the food sector for the rapid determination of surface contamination.
One of the most common problems in Regenerative Medicine is the regeneration of damaged bone with the aim of repairing or replacing lost or damaged bone tissue by stimulating the natural regenerative process. Particularly in the fields of orthopedic, plastic, reconstructive, maxillofacial and craniofacial surgery there is need for successful methods to restore bone. From a regenerative point of view two different bone replacement problems can be distinguished: large bone defects and small bone defects. Currently, no perfect system exists for the treatment of large bone defects.
The Chemotype of Chromanones as a Privileged Scaffold for Multineurotarget Anti-Alzheimer Agents
(2022)
Ausführungsbeispiele schaffen eine Vorrichtung zur Desinfektion oder Sanitisierung zumindest eines Gegenstands. Die Vorrichtung umfasst einen Ozongenerator, der ausgebildet ist, um Ozon zu erzeugen und in einem Volumen freizusetzen. Ferner umfasst die Vorrichtung einen Ozonsensor, der ausgebildet ist, um eine Ozonkonzentration in dem Volumen zu messen. Ferner umfasst die Vorrichtung eine Steuereinrichtung, die konfiguriert ist, um den Ozongenerator anzusteuern Ozon zu erzeugen, so dass eine gemessene Ozonkonzentration für einen vorgegebenen Zeitraum bei einer vorgegebenen Ozonkonzentration oder innerhalb eines vorgegebenen Ozonkonzentrationsbereichs liegt, um in dem Volumen befindliche Gegenstände zu desinfizieren oder sanitisieren.
Sicherheit im Fährverkehr
(2012)
Asymmetric threats require powerful surveillance technology which helps to preserve the security. Security checks which focus on Improvised Explosive Devices (IED’s) or the identification of persons carrying hazardous substances are the major task of our research within the HAMLeT+ (Hazardous Material Localization and Person Tracking) project. Further on, there is a pressing need for assisting the security personnel, either civil or military, by extending the detection capabilities and to deliver efficient and reliable, real time decision support for their task to percept threats. Military camp protection with heterogeneous net-worked sensors and comprehensive sensor data fusion could be such an element. The technology developments concentrate on the integration of different sensor types (video, tracking sensors, CBRNE sensors) in order to get a better and comprehensive understanding in a defined entry area. Data fusion is used to combine kinematic data of persons (where, when) with additional attribute information of them (what) in order to identify that single person carrying the attributes and to classify the threat. The project was initiated as a Supporting Activity funded by the EU within the PASR 2006 scheme. With regards to the specific task for military camp protection it was extended and redesigned. In HAMLeT+ several chemical sensors for hydrocarbons like fuels, alcohols or solvents were used. Such chemicals are available in bigger amounts on the free market. Using them e.g. as fire accelerants they can cause a huge damage. Therefore their detection or the detection of persons carrying such substances or having contaminations on their clothes is of great interest. Sensitive devices for the detection of these analytes are e.g. metal oxide sensors [1]. Our presentation illustrates experimental data, which were gathered with the experimental system HAMLeT+ during the NATO “Defense Against Terrorism (DAT)” campaign „COMMON SHIELDS” in August and September 2008.
A major challenge modern society has to face is the increasing need for tissue regeneration due to degenerative diseases or tumors, but also accidents or warlike conflicts. There is great hope that stem cell-based therapies might improve current treatments of cardiovascular diseases, osteochondral defects or nerve injury due to the unique properties of stem cells such as their self-renewal and differentiation potential. Since embryonic stem cells raise severe ethical concerns and are prone to teratoma formation, adult stem cells are still in the focus of research. Emphasis is placed on cellular signaling within these cells and in between them for a better understanding of the complex processes regulating stem cell fate. One of the oldest signaling systems is based on nucleotides as ligands for purinergic receptors playing an important role in a huge variety of cellular processes such as proliferation, migration and differentiation. Besides their natural ligands, several artificial agonists and antagonists have been identified for P1 and P2 receptors and are already used as drugs. This review outlines purinergic receptor expression and signaling in stem cells metabolism. We will briefly describe current findings in embryonic and induced pluripotent stem cells as well as in cancer-, hematopoietic-, and neural crest-derived stem cells. The major focus will be placed on recent findings of purinergic signaling in mesenchymal stem cells addressed in in vitro and in vivo studies, since stem cell fate might be manipulated by this system guiding differentiation towards the desired lineage in the future.
Mesenchymal stem cells (MSCs) are an attractive cell source for Regenerative Dentistry in particular due to their ability to differentiate towards osteoblasts, among other lineages. Tooth and jaw bone loss are frequent sequelae of traumatic and pathological conditions in both the young and the elderly and must be met by appropriate prosthetic replacements. For successful osseointegration of the dental implant a sufficient bone level is necessary. Besides the utilization of bone autografts or synthetic biomaterials, medical research is more and more focused on the utilization of MSCs. Compared to cells obtained from liposuction material, ectomesenchymal stem cells derived from the head area e.g. out of dental follicles or particulate, non-vascularized bone chips show a higher differentiation potential towards osteoblasts.
Polymerase Chain Reaction
(2021)
DNA Sequencing
(2021)
After more than twenty years of research, the molecular events of apoptotic cell death can be succinctly stated; different pathways, activated by diverse signals, increase the activity of proteases called caspases that rapidly and irreversibly dismantle condemned cell by cleaving specific substrates. In this time the ideas that apoptosis protects us from tumourigenesis and that cancer chemotherapy works by inducing apoptosis also emerged. Currently, apoptosis research is shifting away from the intracellular events within the dying cell to focus on the effect of apoptotic cells on surrounding tissues. This is producing counterintuitive data showing that our understanding of the role of apoptosis in tumourigenesis and cancer therapy is too simple, with some interesting and provocative implications. Here, we will consider evidence supporting the idea that dying cells signal their presence to the surrounding tissue and, in doing so, elicit repair and regeneration that compensates for any loss of function caused by cell death. We will discuss evidence suggesting that cancer cell proliferation may be driven by inappropriate or corrupted tissue-repair programmes that are initiated by signals from apoptotic cells and show how this may dramatically modify how we view the role of apoptosis in both tumourigenesis and cancer therapy.
Modern PCR-based analytical techniques have reached sensitivity levels that allow for obtaining complete forensic DNA profiles from even tiny traces containing genomic DNA amounts as small as 125 pg. Yet these techniques have reached their limits when it comes to the analysis of traces such as fingerprints or single cells. One suggestion to overcome these limits has been the usage of whole genome amplification (WGA) methods. These methods aim at increasing the copy number of genomic DNA and by this means generate more template DNA for subsequent analyses. Their application in forensic contexts has so far remained mostly an academic exercise, and results have not shown significant improvements and even have raised additional analytical problems. Until very recently, based on these disappointments, the forensic application of WGA seems to have largely been abandoned. In the meantime, however, novel improved methods are pointing towards a perspective for WGA in specific forensic applications. This review article tries to summarize current knowledge about WGA in forensics and suggests the forensic analysis of single-donor bioparticles and of single cells as promising applications.
The development of whole-genome amplification (WGA) techniques has opened up new avenues for genetic analysis and genome research, in particular by facilitating the genome-wide analysis of few or even single copies of genomic DNA, such as from single cells (prokaryotic or eukaryotic) or virions. Using WGA, the few copies of genomic DNA obtained from such entities are unspecifically amplified using PCR or PCR-related processes in order to obtain higher DNA quantities that can then be successfully analysed further.
Discrimination and classification of eight strains related to meat spoilage microorganisms commonly found in poultry meat were successfully carried out using two dispersive Raman spectrometers (Microscope and Portable Fiber-Optic systems) in combination with chemometric methods. Principal Components Analysis (PCA) and Multi-Class Support Vector Machines (MC-SVM) were applied to develop discrimination and classification models. These models were certified using validation data sets which were successfully assigned to the correct bacterial genera and even to the right strain. The discrimination of bacteria down to the strain level was performed for the pre-processed spectral data using a 3-stage model based on PCA. The spectral features and differences among the species on which the discrimination was based were clarified through PCA loadings. In MC-SVM the pre-processed spectral data was subjected to PCA and utilized to build a classification model. When using the first two components, the accuracy of the MC-SVM model was 97.64% and 93.23% for the validation data collected by the Raman Microscope and the Portable Fiber-Optic Raman system, respectively. The accuracy reached 100% for the validation data by using the first eight and ten PC’s from the data collected by Raman Microscope and by Portable Fiber-Optic Raman system, respectively. The results reflect the strong discriminative power and the high performance of the developed models, the suitability of the pre-processing method used in this study and that the low accuracy of the Portable Fiber-Optic Raman system does not adversely affect the discriminative power of the developed models.
Mobiles Laser-Schneidsystem zur Unterstützung der USBV-Entschärfung und Beweissicherung (mobiLaS)
(2022)
Als rohstoffarme und exportorientierte Wirtschaftsnation ist die Bundesrepublik in ho- hem Maß auf die Sicherung und Sicherheit der Logistikketten im grenzüberschreiten- den Verkehr angewiesen. Angesichts der komplexen Transportstrukturen bei grenz- überschreitenden Transporten kommt den eingesetzten Kontroll- und Prüfverfahren besondere Bedeutung zu: Einerseits müssen Kostenbelastungen, Unterbrechungen und Verzögerungen in der Transportkette minimiert, andererseits besonders illegale Einfuhren, Transporte und Substanzen unterbunden werden. Von besonderer Bedeu- tung für Verdachts- bzw. Stichprobenkontrollen ist der Einsatz speziell trainierter Spür- hunde. Als besonders leistungsfähige ‚lebende Sensoren‘ sind sie in der Lage, eine Vielzahl von Stoffen zu detektieren. Der Einsatz von Spürhunden unterliegt allerdings engen Grenzen: Hoher Trainingsaufwand, eng begrenzte Einsatzdauer, begrenzte Verfügbarkeit. Die Entwicklung neuer, optimierter Einsatzverfahren für Spürhunde z. B. mit höheren Durchsatzraten und überprüfbarer Verlässlichkeit durch Einbindung technischer Systeme ist daher ein wichtiger Beitrag für die Sicherung und Sicherheit der Logistikketten.
In der Regel werden für die Hundeausbildung lose Explosivstoffe im Grammbereich eingesetzt. Deren Umgang unterliegt jedoch aufgrund des Gefährdungspotenzials und aus rechtlichen Gründen sehr strikten Regeln. Diese können nur mit Schwierigkeiten mit den Erfordernissen der Hundeausbildung in Einklang gebracht werden. Der Umgang mit hoch-brisanten Zündstoffen und Selbstlaboraten (z.B. TATP und HMTD) stellt aufgrund der nochmals erhöhten Gefährlichkeit und zusätzlicher gesetzlicher Regelungen eine spezielle Herausforderung dar. Das Poster beschreibt die EMPK® (Echtstoff-Mikromengen-Prüfkörper), die eine sichere Alternative als Trainingshilfsmittel für Sprengstoffspürhunde darstellen.
Telogene Einzelhaare sind häufig vorkommende Spurentypen an Tatorten. Derzeit werden sie zumeist von der STR-Typisierung ausgeschlossen, weil ihre STR-Profile aufgrund geringer DNA-Mengen und starker DNA-Degradierung in vielen Fällen unvollständig und schwierig zu interpretieren sind. In der vorliegenden Arbeit wurde eine systematische Vorgehensweise angewandt, um Korrelationen zwischen der DNA-Menge und DNA-Degradierung zu dem Erfolg der STR-Typisierung aufzuweisen und darauf basierend den Typisierungs-Erfolg von DNA aus Haaren vorhersagen zu können.
Zu diesem Zweck wurde ein human- (RiboD) und ein canin-spezifischer (RiboDog) qPCR-basierter Assay zur Messung der DNA-Menge und Bewertung der DNA-Integrität mittels eines Degradierungswerts (D-Wert) entwickelt. Aufgrund der Lage der genutzten Primer, welche auf ubiquitär vorkommende ribosomale DNA-Sequenzen abzielen, ist das Funktionsprinzip schnell und kostengünstig auf unterschiedliche Spezies anzuwenden. Die Funktionsweise der Assays wurde mittels seriell degradierter DNA bestätigt und der humane Assay wurde im Vergleich zum kommerziellen Quantifiler? Trio DNA Quantification Kit validiert. Schließlich wurde mit den Assays an DNA aus telogenen und katagenen Einzelhaaren von Menschen und Hunden der Zusammenhang zwischen DNA-Menge und DNA-Integrität zu der Vollständigkeit der STR-Allele (Allel Recovery) von DNA-Profilen untersucht, die mittels kapillarelektrophoretischer (CE) STR-Kits erhaltenen wurde. Es zeigte sich, dass bei humanen Einzelhaaren die Allel-Recovery sowohl von der DNA-Menge als auch der DNA-Integrität abhängt. Dagegen war die DNA-Degradierung bei einzelnen Hundehaaren durchweg geringer und die Allel-Recovery hing allein von der extrahierten DNA-Menge ab.
Um die STR-Analytik degradierter humaner DNA-Proben weiter zu verbessern, wurde ein neuartiger NGS-basierter Assay (maSTR, Mini-Amplikon-STR) etabliert, der die 16 forensischen STR-Loci des European Standard Sets und Amelogenin als sehr kurze Amplikons (76-296 bp) parallel amplifiziert. Mit intakter DNA generierte der maSTR-Assay im Mengenbereich von 200 pg eingesetzter DNA reproduzierbare, vollständige Profile ohne Allelic Drop-ins. Bei niedrigeren DNA-Mengen traten vereinzelt Allelic Drop-ins auf, wobei unter Verwendung von mindestens 43 pg DNA vollständige Profile erhalten wurden.
Die kombinierte Strategie aus RiboD-Messungen der DNA-Menge und -Integrität und daraus resultierendem STR-Typisierungserfolg des maSTR-Assays wurde an degradierter DNA validiert. Anschließend wurde die Strategie auf DNA aus telogenen und katagenen Einzelhaaren angewandt und mit den Ergebnissen des CE-basierten PowerPlex? ESX 17-Kits verglichen, das dasselbe STR-Marker-Set analysiert. Dabei zeigte sich, dass der Erfolg der STR-Typisierung beider STR-Assays sowohl von der optimalen Menge der Template-DNA als auch von der DNA-Integrität abhängt. Mit dem maSTR-Assay wurden vollständige Profile mit ungefähr 50 pg Input-DNA für leicht degradierte DNA aus Einzelhaaren nachgewiesen, sowie mit ungefähr 500 pg stark degradierter DNA. Aufgrund der geringen DNA-Mengen von telogenen Einzelhaaren schwankte die Reproduzierbarkeit der maSTR-Ergebnisse, war jedoch stets dem PowerPlex? ESX 17-Kit in Bezug auf die Allel-Recovery überlegen.
Ein Vergleich mit zwei, hinsichtlich der Längenverteilung der Amplikons komplementären CE-basierten STR-Kits (PowerPlex? ESX 17 und ESI 17 Fast), sowie mit einem kommerziellen NGS-Kit (ForenSeq? DNA Signature Prep) ergab, dass nicht die Technik der NGS, sondern die Kürze der Amplikons der wichtigste Faktor zur Typisierung degradierter DNA ist. Der maSTR-Assay wies in allen Vergleichen mit den genutzten kommerziellen Kits jedoch eine höhere Anzahl an Allelic Drop-ins auf. Diese traten umso häufiger auf, je geringer die verwendete DNA-Menge und je stärker degradiert diese war.
Weil Profile mit Allelic Drop-ins Mischprofilen entsprechen, wurden die per maSTR-Assay generierten STR-Profile mit Verfahren zur Interpretation von Mischspuren untersucht. Bei der Composite-Interpretation werden alle vorkommenden Allele von Replikaten gezählt, bei der Consensus-Interpretation lediglich die reproduzierbaren Allele. Dabei stellte sich heraus, dass im Fall von wenigen Allelic Drop-ins (PowerPlex? ESX 17-generierte Profile) die Composite-Interpretation und bei Allelic Drop-in-haltigen Profilen (maSTR-generierte Profile) die Consensus-Interpretation am besten geeignet ist.
Schließlich wurde mittels der GenoProof Mixture 3-Software untersucht, inwieweit semi- und vollständig kontinuierliche probabilistische Verfahren bei der biostatistischen Bewertung der DNA-Profile aus Einzelhaaren geeignet sind. Dabei zeigte sich, dass der maSTR-Assay aufgrund der hohen Anzahl an Allelic Drop-ins den CE-basierten Methoden nur in Fällen von DNA leicht überlegen ist, die in ausreichender Menge und gering degradiert vorliegt. In diesem Bereich gelingt die Zuordnung des Profils aus Haaren zum Referenzprofil jedoch ebenfalls mittels CE-basierten Methoden.
Aus allen Ergebnissen wurde eine Empfehlung für die Handhabung von DNA aus ausgefallenen Einzelhaaren abgeleitet, die auf dem DNA-Degradierungsgrad in Kombination mit der DNA-Menge basiert. Die vorliegende Arbeit schafft somit eine Grundlage, um ausgefallene Einzelhaare in der Routine-Arbeit von kriminaltechnischen Ermittlungen nutzbar zu machen, sowie gegebenenfalls auf andere Spurentypen mit degradierter DNA geringer Menge anzuwenden. Dadurch könnte die Nutzbarkeit solcher Spurentypen für die forensische Kriminalistik erhöht werden, insbesondere wenn die standardmäßig verwendeten CE-basierten Methoden versagen. Perspektivisch ist die Technik der NGS aufgrund der großen Multiplexierbarkeit uniformer, kurzer Marker generell der CE-basierten Technik bei der Typisierung degradierter DNA überlegen.
Space exposure experiments from the last 15 years have unexpectedly shown that several terrestrial organisms, including some multi-cellular species, are able to survive in open space without protection. The robustness of bdelloid rotifers suggests that these tiny creatures can possibly be added to the still restricted list of animals that can deal with the exposure to harsh condition of space. Bdelloids are one of the smallest animals on Earth. Living all over the world, mostly in semi-terrestrial environments, they appear to be extremely stress tolerant. Their desiccation tolerance at any stage of their life cycle is known to confer tolerance to a variety of stresses including high doses of radiation and freezing. In addition, they constitute a major scandal in evolutionary biology due to the putative absence of sexual reproduction for at least 60 million years. Adineta vaga, with its unique characteristics and a draft genome available, was selected by ESA (European Space Agency) as a model system to study extreme resistance of organisms exposed to space environment. In this manuscript, we documented the resistance of desiccated A. vaga individuals exposed to increasing doses of X-ray, protons and Fe ions. Consequences of exposure to different sources of radiation were investigated in regard to the cellular type including somatic (survival assay) and germinal cells (fertility assay). Then, the capacity of A. vaga individuals to repair DNA DSB induced by different source of radiation was investigated. Bdelloid rotifers represent a promising model in order to investigate damage induced by high or low LET radiation. The possibility of exposure both on hydrated or desiccated specimens may help to decipher contribution of direct and indirect radiation damage on biological processes. Results achieved through this study consolidate our knowledge about the radioresistance of A. vaga and improve our capacity to compare extreme resistance against radiation among living organisms including metazoan.
This volume of the series Springer Briefs in Space Life Sciences explains the physics and biology of radiation in space, defines various forms of cosmic radiation and their dosimetry, and presents a range of exposure scenarios. It also discusses the effects of radiation on human health and describes the molecular mechanisms of heavy charged particles’ deleterious effects in the body. Lastly, it discusses countermeasures and addresses the vital question: Are we ready for launch?
Written for researchers in the space life sciences and space biomedicine, and for master’s students in biology, physics, and medicine, the book will also benefit all non-experts endeavoring to understand and enter space.
Dieses Buch ganz besonders dazu geeignet, Studierenden in den ersten Semestern den Zugang zur Technischen Mechanik zu öffnen und ihnen dabei zu helfen, diese gefürchtete Prüfung des Maschinenbaustudiums erfolgreich zu bestehen. Mit rund 120 Beispielen und Aufgaben mit detaillierten Lösungen sowie Fallstudien zu interessanten mechanischen Fragen.
Holzfahrrad im Eigenbau
(2007)
Bei Thymian (Thymus vulgaris) handelt es sich um eine sehr varietätenreiche Art, die aufgrund ihres Gehaltes an therapeutisch wirksamen Inhaltsstoffen als Arzneipflanze monographiert ist. Insbesondere das ätherische Öl mit dem Hauptbestandteil Thymol (ca. 50%) hat eine hohe antioxidative Wirkung. Ziel ist es, dieses Potential als nachhaltig produzierte Additive zu nutzen. Hierfür eignen sich antioxidativ bzw. antimikrobiell wirksame sowie UV-absorbierende Substanzen, die das Produkt bei Zusatz vor oxidativem Stress, mikrobiellem Abbau und Qualitätsverlust schützen.
Hierzu werden zunächst sechs Varianten auf verschiedene Parameter analysiert, um die potenteste Variante auszuwählen. Auf diese Variante wird sich die weitere Forschung konzentrieren.
Daher wird das ätherische Öl durch azeotrope Destillation extrahiert und mittels GCMS analysiert. In Extrakten werden zudem das AP und Absorptionsverhalten bestimmt. Auch die chemische Zusammensetzung des Extrakts sowie die flüchtigen Stoffe des Thymians werden untersucht. Generell gibt es wenig qualitative, teilweise jedoch quantitative Unterschiede: Eine Variante weist u.a. einen deutlich höheren Thymolgehalt im Öl (ca. 65 %) und ein hohes hydrophiles AP auf. Somit ist eine vielversprechende Variante für die weitere Entwicklung und Optimierung bioaktiver Additive gefunden.
Background: Coniferous woods (Abies nordmanniana (Stev.) Spach, Abies procera Rehd, Picea abies (L.) H.Karst, and Picea pungens Engelm.) could contain useful secondary metabolites to produce sustainable packaging materials, e.g., by substitution of harmful petrol-based additives in plastic packaging. This study aims to characterise the antioxidant and light-absorbing properties and ingredients of different coniferous wood extracts with regard to different plant fragments and drying conditions. Furthermore, the valorisation of used Christmas trees is evaluated. Methods: Different drying and extraction techniques were applied with the extracts being characterised by determining the total phenolic content (TPC), total antioxidant capacity (TAC), and absorbance in the ultraviolet range (UV). Gas chromatography coupled with mass spectrometry (GC-MS) and an acid–butanol assay (ABA) were used to characterise the extract constituents. Results: All the extracts show a considerably high UV absorbance while interspecies differences did occur. All the fresh and some of the dried biomass extracts reached utilisable TAC and TPC values. A simplified extraction setup for industrial application is evaluated; comparable TAC results could be reached with modifications. Conclusion: Coniferous woods are a promising renewable resource for preparation of sustainable antioxidants and photostabilisers. This particularly applies to Christmas trees used for up to 12 days. After extraction, the biomass can be fully valorised by incorporation in paper packaging.
Different analyses and feasibility studies have been conducted on the plant extracts of thyme (Thymus vulgaris), European horse chestnut (Aesculus hippocastanum), Nordmann fir (Abies nordmanniana), and snowdrop (Galanthus elwesii) to evaluate bio‐based alternatives to common petrol‐based stabilisers. For this purpose, in this study, plant extracts were incorporated into poly‐lactic acid films (PLA) at different concentrations. The films’ UV absorbance and migration into packed food was analysed via photometric assays (ABTS radical cation scavenging capacity assay, β‐carotene assay) and GC–MS analysis. Furthermore, the synergistic antioxidant effects of various combinations of extracts and isolated active compounds were determined. This way, antioxidant effects can be increased, allowing for a highly effective use of resources. All extracts were successfully incorporated into PLA films and showed notable photoabsorbing effects, while no migration risk was observed. Depending on extract combinations, high synergistic effects of up to 726% can be utilised to improve the effectiveness of bio‐based extracts. This applies particularly to tomato paste and Aesculus hippocastanum extracts, which overall show high synergistic and antioxidant effects in combination with each other and with isolated active compounds. The study shows that it is possible to create safe bio‐based antioxidant films which show even improved properties when using highlighted target combinations.
Background: To protect renewable packaging materials against autoxidation and decomposition when substituting harmful synthetic stabilizers with bioactive and bio-based compounds, extracts from Aesculus hippocastanum L. seeds were evaluated. The study objectives were to determine the antioxidant efficacy of bioactive compounds in horse chestnut seeds with regard to different seed fractions, improve their extraction, and to evaluate waste reuse. Methods: Different extraction techniques for field samples were evaluated and compared with extracts of industrial waste samples based on total phenolic content and total antioxidant capacity (2,2’-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS)). The molecular weight distribution and absorbance in ultraviolet range (UV) of seed coat extracts were determined, and the possibility of extracts containing proanthocyanidins was examined. Results: Seed coat extracts show a remarkable antioxidant activity and a high UV absorbance. Passive extractions are efficient and much less laborious. Applying waste product seed coats leads to a reduced antioxidant activity, total phenolic content, and UV absorbance compared to the field sample counterparts. In contrast to peeled seed extracts, all seed coat extracts contain proanthocyanidins. Discussion: Seed coats are a potential source of bioactive compounds, particularly regarding sustainable production and waste reuse. With minimum effort, highly bioactive extracts with high potential as additives can be prepared.
Typically, plastic packaging materials are produced using additives, like e.g. stabilisers, to introduce specific desired properties into the material or, in case of stabilisers, to prolong the shelf life of such packaging materials. However, those stabilisers are typically fossil-based and can pose risks to both environmental and human health. Therefore, the present study presents more sustainable alternatives based on regional renewable resources which show the relevant antioxidant, antimicrobial and UV absorbing properties to successfully serve as a plastic stabiliser. In the study, all plants are extracted and characterised with regard to not only antioxidant, antimicrobial and UV absorbing effects, but also with regard to additional relevant information like chemical constituents, molar mass distribution, absorbance in the visible range et cetera. The extraction process is furthermore optimised and, where applicable, reasonable opportunities for waste valorisation are explored and analysed. Furthermore, interactions between analysed plant extracts are described and model films based on Poly-Lactic Acid are prepared, incorporating analysed plant extracts. Based on those model films, formulation tests and migration analysis according to EU legislation is conducted.
The well-known aromatic and medicinal plant thyme (Thymus vulgaris L.) includes phenolic terpenoids like thymol and carvacrol which have strong antioxidant, antimicrobial and UV absorbing effects. Analyses show that those effects can be used in both lipophilic and hydrophilic surroundings, that the variant Varico 3 is a more potent cultivar than other analysed thyme variants, and that a passive extraction setup can be used for extract preparation while distillation of the Essential Oils can be a more efficient approach.
Macromolecular antioxidant polyphenols, particularly proanthocyanidins, have been found in the seed coats of the European horse chestnut (Aesculus hippocastanum L.) which are regularly discarded in phytopharmaceutical industry. In this study, such effects and compounds have been reported for the first time while a valorisation of waste materials has been analysed successfully. Furthermore, a passive extraction setup for waste materials and whole seeds has been developed. In extracts of snowdrops, precisely Galanthus elwesii HOOK.F., high concentrations of tocopherol have been found which promote a particularly high antioxidant capacity in lipophilic surroundings. Different coniferous woods (Abies div., Picea div.) which are in use as Christmas trees are extracted after separating the biomass in leafs and wood parts before being analysed regarding extraction optimisation and drought resistance of active substances. Antioxidant and UV absorbing proanthocyanidins are found even in dried biomasses, allowing the circular use of already used Christmas trees as bio-based stabilisers and the production of sustainable paper as a byproduct.
Cysticfibrosis (CF) arises from mutations in the CF transmembrane conductance regulator (CFTR) gene, resulting in progressiveand life-limiting respiratory disease. R751L is a rare CFTR mutation that is poorly characterized. Our aims were to describe theclinical and molecular phenotypes associated with R751L. Relevant clinical data were collected from three heterozygote individu-als harboring R751L (2 patients with G551D/R751L and 1 with F508del/R751L). Assessment of R751L-CFTR function was made inprimary human bronchial epithelial cultures (HBEs) andXenopusoocytes. Molecular properties of R751L-CFTR were investigatedin the presence of known CFTR modulators. Although sweat chloride was elevated in all three patients, the clinical phenotypeassociated with R751L was mild. Chloride secretion in F508del/R751L HBEs was reduced compared with non-CF HBEs and asso-ciated with a reduction in sodium absorption by the epithelial sodium channel (ENaC). However, R751L-CFTR function inXenopusoocytes, together with folding and cell surface transport of R751L-CFTR, was not different from wild-type CFTR. Overall,R751L-CFTR was associated with reduced sodium chloride absorption but had functional properties similar to wild-type CFTR.This is thefirst report of R751L-CFTR that combines clinical phenotype with characterization of functional and biological proper-ties of the mutant channel. Our work will build upon existing knowledge of mutations within this region of CFTR and, importantly,inform approaches for clinical management. Elevated sweat chloride and reduced chloride secretion in HBEs may be due to al-ternative non-CFTR factors, which require further investigation.
Lignin ist bereits ein intensives Gebiet der Forschung, allerdings werden Verknüpfungen zwischen Quelle, Aufschlussmethode und Einsatz in der Literatur kaum beschrieben. In der vorliegenden Arbeit werden Lignine von verschiedenen Quellen (Weizenstroh, Buche, Nadelholz) und Aufschlussmethoden (AFEX, Wasserdampfaufschluss, Organosolv, Saure Hydrolyse) analytisch erfasst und hinsichtlich ihres Einsatzes in polymeren Materialien charakterisiert. Eine breite Auswahl an Methoden wurden eingesetzt, FT-IR- Spektroskopie, UV-Vis, 31P-NMR, GPC, Pyrolyse-GC/MS, sowie HPLC zur Bestimmung der Reinheit gemäß des NREL-Standard-Protokolls. Thermische Analysen, wie TGA und DSC zeigten Glasübergangstemperaturen um 120°C, sowie Zersetzungstemperaturen zwischen 340°C und 380°C. Die Ergebnisse weisen für das Organosolv-Buchenholz-Lignin hochreine Fraktionen auf, die bis dato noch nicht erreicht wurden. Die Ergebnisse dieser Arbeit identifizien die Organosolv-Buchenholz-Lignine als ein verwertbares Produkt im Hinblick auf die Anwendung in Polyurethanen sowie Phenol-Formaldehydharzen.
The simultaneous operation of multiple different semiconducting metal oxide (MOX) gas sensors is demanding for the readout circuitry. The challenge results from the strongly varying signal intensities of the various sensor types to the target gas. While some sensors change their resistance only slightly, other types can react with a resistive change over a range of several decades. Therefore, a suitable readout circuit has to be able to capture all these resistive variations, requiring it to have a very large dynamic range. This work presents a compact embedded system that provides a full, high range input interface (readout and heater management) for MOX sensor operation. The system is modular and consists of a central mainboard that holds up to eight sensor-modules, each capable of supporting up to two MOX sensors, therefore supporting a total maximum of 16 different sensors. Its wide input range is archived using the resistance-to-time measurement method. The system is solely built with commercial off-the-shelf components and tested over a range spanning from 100Ω to 5 GΩ (9.7 decades) with an average measurement error of 0.27% and a maximum error of 2.11%. The heater management uses a well-tested power-circuit and supports multiple modes of operation, hence enabling the system to be used in highly automated measurement applications. The experimental part of this work presents the results of an exemplary screening of 16 sensors, which was performed to evaluate the system’s performance.
The following work presents algorithms for semi-automatic validation, feature extraction and ranking of time series measurements acquired from MOX gas sensors. Semi-automatic measurement validation is accomplished by extending established curve similarity algorithms with a slope-based signature calculation. Furthermore, a feature-based ranking metric is introduced. It allows for individual prioritization of each feature and can be used to find the best performing sensors regarding multiple research questions. Finally, the functionality of the algorithms, as well as the developed software suite, are demonstrated with an exemplary scenario, illustrating how to find the most power-efficient MOX gas sensor in a data set collected during an extensive screening consisting of 16,320 measurements, all taken with different sensors at various temperatures and analytes.
During the last 50 years, a broad range of visible light curing resin based composites (VLC RBC) was developed for restorative applications in dentistry. Correspondingly, the technologies of light curing units (LCU) have changed from UV to visible blue light, and there from quartz tungsten halogen over plasma arc to LED LCUs increasing their light intensity significantly. In this thesis, the influence of the curing conditions in terms of irradiance, exposure time and irradiance distribution of LCU on reaction kinetics as well as corresponding mechanical and viscoelastic properties were investigated.
Bioinspired stem cell-based hard tissue engineering includes numerous aspects: The synthesis and fabrication of appropriate scaffold materials, their analytical characterization, and guided osteogenesis using the sustained release of osteoinducing and/or osteoconducting drugs for mesenchymal stem cell differentiation, growth, and proliferation. Here, the effect of silicon- and silicate-containing materials on osteogenesis at the molecular level has been a particular focus within the last decade. This review summarizes recently published scientific results, including material developments and analysis, with a special focus on silicon hybrid bone composites. First, the sources, bioavailability, and functions of silicon on various tissues are discussed. The second focus is on the effects of calcium-silicate biomineralization and corresponding analytical methods in investigating osteogenesis and bone formation. Finally, recent developments in the manufacturing of Si-containing scaffolds are discussed, including in vitro and in vivo studies, as well as recently filed patents that focus on the influence of silicon on hard tissue formation.