Energy on-site coverage by PV-gain for non-residential buildings - An advancement of the DIN-approach by standardized temperature-dependent load profiles
BAUPHYSIK
Authors: Jedek, Christoph
Abstract
The rising importance of renewable energy production challenges both, execution in reality and legal calculation methods. Regarding the production of electrical energy via photovoltaics (PV), the current German national standard DIN V 18599 provides yet a simplified calculation approach within the monthly balance procedure of the energy consumption calculation. But the calculated internal use of PV-gains according to DIN is much higher than can be expected in real operation. Hence an alternative approach was developed, with the aim of a more realistic calculation of the internal usable PV-gains in non-residential buildings. Therefore, the developed calculation method considers the concurrency of electricity generation and electricity need on an hourly time scale by use of solar radiation profiles (SSP), standard load profiles (SLP), and temperature-dependent load profiles (TLP). Analytical investigations of the developed method for a sample building, using the TEK-Tool from Institute for Housing and Environment (IWU), confirmed a distinct overestimation of the calculated internal use of PV-incomes within the energy consumption calculation after DIN V 18599. The differentiated calculation of internal useable PV-gains in addition with the ability to consider battery storage devices for an increased internal use represents an expedient enhancement of the DIN method.
FadP affects the virulence of Ralstonia pseudosolanacearum by altering nitrogen metabolism processes and reducing motility, cellulase, and extracellular polysaccharide production
JOURNAL OF PLANT PATHOLOGY
Authors: Wu, Jia-chun; Zhong, Min; Li, Xing-wei; Yu, Cheng-peng; Liu, Qiong-guang
Abstract
Ralstonia pseudosolanacearum, the causative agent of bacterial wilt disease, is a significant pathogen of economically-important agricultural crops. FadP is a transcriptional regulator of fatty acid degradation; however, its function remains unknown in R. pseudosolanacearum. Herein, a R. pseudosolanacearum fadP deletion mutant (Delta fadP) was constructed to examine the role of FadP. Compared with wild-type strain Tm1401 and fadP complementation strain R-Delta fadP, Delta fadP showed reduced motility and cellulase and extracellular polysaccharide production, along with decreased resistance to tetracycline and virulence on tomato plants. Further, the mutant strain induced only a weak hypersensitive response in tobacco plants. To further understand the underlying virulence mechanisms, RNA-Seq technology was used to compare the transcriptomes of the wild-type and mutant strains. Analysis revealed 848 differentially-expressed genes, amongst which 505 were up-regulated and 343 were down-regulated in Delta fadP. Both flagella and chemotaxis genes were up-regulated, while genes coding for extracellular hydrolytic enzymes, cytochrome c oxidase, and carbon and nitrogen metabolism proteins were down-regulated. Two-step reverse-transcription polymerase chain reaction analysis targeting 13 genes confirmed that the expression of egl, rsl, pehC, pme, cspD3, narH, norB, ccoP, tek, and xpsR was significantly decreased. Our results suggest that FadP affects the virulence of R. pseudosolanacearum by altering nitrogen metabolism processes, reducing bacterial motility and extracellular polysaccharide and cellulase production, and affecting protein-carbohydrate interactions involved in host recognition, attachment, and invasion.