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Publications
Publications (38)
Duckweed is gaining attention in animal nutrition and is considered as a potential alternative protein source for broiler chickens. In order to evaluate the nutritional value of duckweed, three individual batches were investigated. They consisted of a mixture of Lemna minuta and Lemna minor (A, 17.5% crude protein), Spirodela polyrhiza (B, 24.6% cr...
Peppermint (Mentha x piperita) is a species with inhibitory allelopathic properties due to its high amounts of terpenes. Recent studies have disclosed dosage dependent growth promotion or defense reactions in plants when facing appropriate amounts of Mentha bouquet terpenes. These positive effects could be of interest for agricultural applications....
Duckweeds are fast-growing and nutritious plants, which are gaining increased attention in different fields of application. Especially for animal nutrition, alternative protein sources are needed to substitute soybean meal. The current bottleneck is the standardized production of biomass, which yields stable quantities of a defined product quality....
In order to produce protein-rich duckweed for human and animal consumption, a stable cultivation process, including an optimal nutrient supply for each species, must be implemented. Modified nutrient media, based on the N-medium for duckweed cultivation, were tested on the relative growth rate (RGR) and crude protein content (CPC) of Lemna minor an...
White cabbage was grown in glasshouses with two Mentha x piperita varieties in randomly designed arrangements during spring and autumn 2011/12. The plots were supplemented with one or four Mentha plants of the same variety possessing three main shoots of 7 nodes. Compared to the controls, most pronounced differences were found when the leaves were...
White cabbage (Brassica oleracea convar. capitata var. alba cv LENNOX F1)
were grown with two Mentha x piperita varieties, “Englische Minze cv Micham”
and “Multimentha” in randomly designed arrangements in greenhouses during
spring (set 1) and autumn (set 2). The single plots were exposed to one or four
Mentha plants of the same variety, each with...
Depending on the dosage, volatile compounds of aromatic plants can have
beneficial or harmful effects on neighbored plants. Low concentrations of some
monoterpenes can promote plant growth whereas higher ones inhibit the
growth, affects the cytoskeleton, alter gene expressions, lead to permanent
stomata opening and desiccation of receiver plants. I...
Light curtain arrays (LC), a recently introduced phenotyping method, yield a binary data matrix from which a shoot silhouette is reconstructed. We addressed the accuracy and applicability of LC in assessing leaf area and maximum height (base to the highest leaf tip) in a phenotyping platform. LC were integrated to an automated routine for positioni...
In the era of rapid expansion of herbicide resistance allelopathy is a fast growing field. However, its application in agriculture is still restricted to organic farming, mostly in context with environmentally friendly weed control, although growth stimulations by allelochemicals are also known. Two representative examples, one for selective inhibi...
Light is an important growth factor in greenhouses. The choice of a covering material strongly influences the light transmittance of a greenhouse. For low energy greenhouses double and even triple covering materials are available. Also covering materials with higher light transmittances than conventional float glass are available. When these materi...
Beginning in the 1950s greenhouse horticulture expandedrapidly fromtemperate
climate zones to the subtropics and tropics. As a result of the tremendous
diversification of application fields for greenhouses, the diversity of greenhouse
covering materials has increased dramatically. The current number of new
products entering the markets is growing c...
A combination of anti-reflection coated glass and ethylene tetrafluoroethylene film is introduced as a novel glazing system for greenhouses and similar buildings. It combines the advantages of the individual materials (durability/low weight; favourable condensation behaviour/self-cleaning) and of single and double layer systems (light transmission/...
Light is an important growth factor in greenhouses. The choice of a covering material strongly influences the light transmittance of a greenhouse. For low energy greenhouses double and even triple covering materials are available. Also covering materials with higher light transmittances than conventional float glass are available. When these materi...
Beginning in the 1950s greenhouse horticulture expandedrapidly fromtemperate
climate zones to the subtropics and tropics. As a result of the tremendous
diversification of application fields for greenhouses, the diversity of greenhouse
covering materials has increased dramatically. The current number of new
products entering the markets is growing c...
Plants protect themselves against potentially harmful UV-B radiation mainly by epidermal accumulation of UV-B shielding phenolic compounds and repair of cellular damage. The capacity and necessity for these protection mechanisms alter with the stage of plant and leaf development, which might be crucial for horticultural hardening techniques aiming...
In Europe, lettuce (Lactuca sativa L., Asteraceae) is commonly raised in greenhouses and transplanted to the field at the age of two to four weeks in order to prolong the growing season. The sudden exposure to outdoor conditions including altered temperature, radiation levels and rainfall events is extremely stressful for non-acclimated seedlings....
Monoterpenes at high atmospheric concentrations are strong growth inhibitors in allelopathic interactions. Effects depend on dose, molecular structure of the monoterpene and on the species of the receiver plant. Stomata are among the first targets affected by camphor and menthol. Previously, it could be demonstrated that the compounds induce swelli...
Solar radiation is a key environmental signal in regulation of plant secondary metabolism. Since metabolic responses to light and ultraviolet (UV) radiation exposure are known to depend on the ratio of spectral ranges (e.g., UV-B/PAR), we examined effects of different UV-B radiation (280-315 nm) and photosynthetically active radiation (PAR, 400-700...
Exposure to the allelopathic monoterpenes camphor (100 mg/10 L) and menthol (50 mg/10 L) for 24 h enhanced transpiration of Arabidopsis thaliana fully developed rosette leaves similar to de-waxing. As ascertained by ESEM analyses the leaf surfaces were spotted with platelet like structures which seem to be partly mixed with the lipophilic epicuticu...
VisualRDK is a high-level programming language for prototyping pervasive applications. Context is tightly integrated into the language itself, so developers can attach functionality to locations, persons, or situations instead of the device. Pervasive computing appliances range from consumer devices over embedded sensor boards to PCs and large-scal...
Our homes and lives are as individual as ourselves. Many aspects, such as technical equipment, furniture, and usage patterns in these surroundings differ. Thus, personalization of applications that operate in such environments is required. The challenge for tools and programming paradigms is to provide a powerful but yet easy-to-use platform. In th...
Most research in the area of publish/subscribe systems has not considered fault-tolerance as a central design issues. However, faults do obviously occur and masking all faults is at least expensive if not impossible. A potential alternative (or sensible supplementation) to fault masking is self-stabilization which allows a system to recover from ar...
The wide-spread availability of programmable network-enabled embedded devices, such as smart phones, electronic toys, home entertainment systems, and even sensor networks provides an opportunity for many new and exciting applications. However, such environments impose a software engineering challenge due to their inherent heterogeneity and distribu...
Asynchronous event-based communication facilitates loose coupling and eases the integration of autonomous, heterogeneous components
into complex systems. Many middleware platforms for event-based communication follow the publish/subscribe paradigm. Despite
the usefulness of such systems, their programming support is currently limited. Usually, publ...
Quality of service (QoS) management has become an important requirement for middleware platforms and distributed applications. Early QoS engineering attempts focused on single-category extensions to standard middleware. In recent years generic middleware frameworks have been proposed in order to facilitate multicategory QoS management. Our experien...
Providing an up-to-date view on dynamically changing data presents difficulties. While several different data-dissemination platforms address the problem, client mobility is still a major challenge. Volatile wireless connections and resource limitations void the attempt to apply the same mechanisms that work in fixed-wired networks. The Rebeca publ...
The Object Management Group's Model Driven Architecture (www.omg.org/mda) is a novel approach to separating business logic from the underlying platform technology. Using MDA, developers create a platform-independent model. A platform-specific model is derived from the PIM to target a specific technology such as Corba, Enterprise JavaBeans, or NET....
In this paper we present a model-driven approach to the composition of QoS mechanisms. The support of multiple QoS categories as well as runtime adaptation requires the ability to change the message path of a middleware on the fly This leads to a new set of problems regarding the composition of individual mechanisms to a functioning message path. E...
The concern for non-functional properties of software components and distributed applications has increased significantly in recent years. Non-functional properties are often subsumed under the term Quality of Service (QoS). It refers to quality aspects of a software component or service such as real-time response guarantees, availability and fault...
The concern for Quality of Service (QoS) management in middleware has been an area of active research for many years. We present a novel QoS management framework for .NET, called DotQoS, which adds generic QoS management to .NET in an architecturally conforming way. It is shown how built-in .NET features such as reflection, interception, and custom...
Zusammenfassung Wir stellen einen Software-Entwicklungsprozess fur komponenten-basierte verteilte Anwendungen vor, der Mehr- kategorie-Dienstgute wahrend des Designs, der Implementierung und zur Laufzeit berucksichtigt. Fur das Design haben wir die UML um Konzepte zur Dienstgute-Modellierung erweitert. Das Modell wird fur die Imple- mentierung weit...
Das Erbringen von Dienstg¨ ute (Quality of Service) ist heute eine wichtige Forderung an verteilte Infrastrukturen. In den letzten Jahren wurden verschiedene Ans ¨ atze unter- sucht, Dienstg¨ uteerbringung in Verteilungsplattformen - in- besondere in objekt-orientierte Middleware - zu integrie- ren. Dabei erwies sich die Integration als problematis...
