Monitoring ClimecoVent-systeem in de praktijk - Technisch, teeltkundig en economisch onderzoek naar een energiezuinige kas bij kwekerij Grenspaal B.V.

De tomatentelers Noud en Roy Steegh zijn in januari 2009 op kwekerij Grenspaal te Wellerlooi (L) gestart met een nieuwe kas, voorzien van het ClimecoVent-systeem. Met het ClimecoVent-systeem wordt beoogd zodanig energie te besparen dat de warmtevraag bij een tomatenteelt neerkomt op een aardgasverbruik van 25 tot 30 m3/m2. De productiedoelen liggen gelijk aan die van een standaard tomatenteelt. Gezien het innovatieve en energiezuinige karakter van het ClimecoVent-systeem, heeft Wageningen UR in samenwerking met Climeco het systeem bij kwekerij Grenspaal over een tijdsspanne van ruim een jaar gemonitord in opdracht van het programma “Kas als Energiebron”. Doordat minder gas is gebruikt voor de verwarming van de kas is ook minder CO2 beschikbaar. In combinatie met de schaduwwerking van het extra scherm zou hiermee mogen worden verwacht dat het productieniveau achterblijft, maar dat is niet gebleken

Het Nieuwe Telen Courgette: Effecten van een nieuw teeltconcept op kasklimaat en energiegebruik

Voor courgette kunnen verschillende onderdelen van Het Nieuwe Telen worden toegepast om te besparen op de warmtevraag. Een beweegbaar scherm is al snel rendabel, en bij vroege teelten is daarnaast ook een vast folie aan te raden. Doordat courgette relatief tolerant is voor een hoge luchtvochtigheid, is een installatie die droge buitenlucht inblaast hier nauwelijks rendabel

Future observational and modelling needs identified on the basis of the existing shelf data

NOWESP has compiled a vast quantity of existing data from the North-West European Shelf. Such a focused task is without precedence. It is now highly recommended that one, or a few national and international data centres or agencies should be chosen and properly supported by the EU, where all available observational data, including the NOWESP data, are collected, stored, regularly updated by the providers of the data, and made available to the researchers. International agreement must be reached on the quality control procedures and quality standards for data to be stored in these data bases. Proper arrangements should be made to preserve the economic value of the data for their "owners" without compromising use of the data by researchers or duplicating data collecting efforts. The continental shelf data needed are concentration fields of temperature, salinity, nutrients, suspended matter and chlorophyll, which can be called "climatological" fields. For this purpose at least one monthly survey on the whole European shelf is needed at least during five years, with a proper spatial resolution e.g. 1 degree by 1 degree, and at least in those areas where climatological data are now totally lacking. From the modelling point of view an alternative would be the availability of data from sufficiently representative fixed stations on the shelf, with weekly sampling for several years

Assessing behavioural changes in ALS: cross-validation of ALS-specific measures

Objective: The Beaumont Behavioural Inventory (BBI) is a behavioural proxy report for the assessment of behavioural changes in ALS. This tool has been validated against the FrSBe, a non-ALS specific behavioural assessment, and further comparison of the BBI against a disease-specific tool was considered. This study cross-validates the BBI against the ALS-FTD-Q. Methods: 60 ALS patients, 8% also meeting criteria for FTD, were recruited. All patients were evaluated using the BBI and the ALS-FTD-Q, completed by a carer. Correlational analysis was performed to assess construct validity. Precision, sensitivity, specificity and overall accuracy of the BBI, when compared to the ALS-FTD-Q, were obtained. Results: The mean score of the whole sample on the BBI was 11.45±13.06. ALS-FTD patients scored significantly higher than non-demented ALS patients (31.6±14.64, 9.62±11.38; p<.0001). A significant large positive correlation between the BBI and the ALS-FTD-Q was observed (r=.807, p<.0001), and no significant correlations between the BBI and other clinical/demographic characteristics, indicating good convergent and discriminant validity, respectively. 72% of overall concordance was observed. Precision, sensitivity and specificity for the classification of severely impaired patients were adequate. However, lower concordance in the classification of mild behavioural changes was observed, with higher sensitivity using the BBI, most likely secondary to BBI items which endorsed behavioural aspects not measured by the ALS-FTD-Q. Discussion: Good construct validity has been further confirmed when the BBI is compared to an ALS-specific tool. Furthermore, the BBI is a more comprehensive behavioural assessment for ALS, as it measures the whole behavioural spectrum in this condition

Histological Chages of Testis and Caput Epididymis in the Goat after Cannulation of the Rete Testis

雄ヤギ5頭を用い, 精巣網カテーテル装着手術後の精巣および精巣上体頭の組織構造を観察するとともに精巣静脈血中のテストステロン濃度を調べた。カテーテル装着手術後の精巣は, いずれも萎縮し, 正常な精子形成過程が観察される精細管は少なかった。また, ライディヒ細胞の形態や染色性には異常は認められなかった。一方, 精巣上体頭では, 精巣上体管が萎縮し, 主細胞の高さは無傷のものよりも有意に減少した。同様の組織構造の変化は, 精巣輸出管を切除した場合の精巣および精巣上体頭でも認められた。精巣静脈血中のテストステロン濃度は無傷の場合94.4ng/mlであり, カテーテル装着手術後では86.5&acd;342.8ng/mlであった。 / The testis and caput epididymis of the goat after cannulation of the rete testis or efferentiectomy were examined histologically. The concentration of testosterone in testicular venous blood collected from the same animals was also measured by radioimmunoassay. After cannulation, seminiferous tubules showed a sign of degeneration, although no morphological change of Leydig cells was observed. Epididymal ducts were severely atrophied and the height of principal epithelial cells was significantly decreased. A similar damage was observed in the testis and epididymis after efferentiectomy. When the efferent duct bundle had been incompletely ligated at cannulation, or rete testis catheter was kept in place until sampling time, damages in the testis were less severe. And in the former case the epididymis was impaired less severely. The concentration of testosterone in testicular venous blood collected from an intact animal was 94.4ng/ml, while that obtained after cannulation was 86.5-342.8ng/ml. These results suggest that degeneration of germ cells in seminiferous tubules observed after cannulation of the rete testis or efferentiectomy may be caused by stagnation of rete testicular fluid in the tubules, and that testosterone in the fluid plays important roles in the maintenance of morphology and function of the principal cells in the caput epididymis

Thermal Enhancement of Cellular Radiation Damage: A Review of Complementary and Synergistic Effects

Hyperthermia treatment can kill mammalian cells in a time and temperature dependent manner. Thermal sensitivity varies extensively among various cell lines in culture and cellular molecular and ultrastructural studies have not resolved which cellular mechanisms underlie thermal cell killing and radiosensitization. The response of cells to heat and radiation are complementary under certain conditions found in human tumors, such as hypoxia, low pH, low nutrient and the S-phase of the cell cycle. Thus, hyperthermia can be used as a complementary treatment modality in the radiotherapy of human cancer. Further studies show that heat treatment causes radiosensitization which is in part associated with the inhibition of repair of radiation damage and is strongly dependent on temperature and on the sequencing. In addition, the conditions such as pH and oxygenation during treatment sequencing can influence the degree of recovery of cells. These factors may be exploited in optimizing therapeutic gain in clinical cancer therapy. Data are shown that transformation from the normal to the tumorigenic state causes random small changes in radiosensitivity and heat sensitivity. Also, treatments combining heat and radiation can lead to increased or decreased transformation in cells depending on the treatment sequence

The frontotemporal syndrome of ALS is associated with poor survival

Thirty percent of ALS patients have a frontotemporal syndrome (FS), defined as behavioral changes or cognitive impairment. Despite previous studies, there are no firm conclusions on the effect of the FS on survival and the use of non-invasive ventilation (NIV) in ALS. We examined the effect of the FS on survival and the start and duration of NIV in ALS. Behavioral changes were defined as >22 points on the ALS-Frontotemporal-Dementia-Questionnaire or ≥3 points on ≥2 items of the Neuropsychiatric Inventory. Cognitive impairment was defined as below the fifth percentile on ≥2 tests of executive function, memory or language. Classic ALS was defined as ALS without the frontotemporal syndrome. We performed survival analyses from symptom ons

Usage of TCRAV and TCRBV gene families in human fetal and adult TCR rearrangements

We have investigated fetal and adult T-cell receptor (TCR) A and B V-gene repertoires both by fluorescence-activated cell sorter (FACS) analysis with the avialable TCR V region-specific mAbs and by the polymerase chain reaction (PRC) with TRC V gene family-specific oligonucleotides. Among the low number of CD3+ T cells, most of the TRC V region tested for could be detected by FACS analysis in liver, bone marrow, and spleen derived from a 14-week-old fetus and two 15-weeks-old fetuses. Similarly, the PCR analysis showed that the majority of the TCRAV and TCRBV families were expressed in the peripheral organs of the 13-week-old fetus, although an apparent absence of particular TCR V families was found in liver and bone marrow. This was most probably the consequence of the low number of CD3+ T cells in these organs. In 17-week-old week-old fetal thymi the level of expression of some TCRAV and TCRBV gene families, in particular those that contain single member, was lower compared to post-partum thymi and adult peripheral blood mononuclear cells. The combined data of FACS and PCR analysis demonstrate that TCR genes belonging to the majority of TCR V gene families can be used in TCR α and β chain rearrngements during early human fetal life. Our data also suggest that the expression levels of some of the single member TCR V gene families may be influenced by the development stage

Belichting bij sla : economische haalbaarheidsstudie

PT nummer 12521-0