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  • 1
    In: Journal of Plant Nutrition and Soil Science, Wiley, Vol. 167, No. 6 ( 2004-12), p. 685-692
    Abstract: Alkyl‐C und Hydrophobizität in B‐ und C‐Horizonten eines sauren Waldbodens In den Horizonten sandiger Unterböden kommt es zur Anreicherung aliphatischer Substanzen, die vermutlich estergebunden sind. Die hydrophobe Natur dieser Verbindungen könnte ihre Stabilisierung gegenüber mikrobiellem Abbau begünstigen. Das Ziel unserer Arbeiten war es, zu untersuchen, ob aliphatische Verbindungen die Hydrophobizität organischer Substanzen im Bodenprofil einer sauren Braunerde unter Buche erhöhen können. Hierzu wurde die Element‐ und Isotopenzusammensetzung von Bodenproben vor und nach Lipidextraktion sowie basischer Hydrolyse untersucht. Zusätzlich wurden Kontaktwinkelmessungen zur Quantifizierung der Hydrophobizität durchgeführt. Curie‐Punkt‐Pyrolyse‐GC/MS wurde angewandt, um die Zusammensetzung des Alkyl‐C zu charakterisieren. Eine Korrelation zwischen der 14 C‐Aktivität und dem Verhältnis der stabilen C‐Isotope (δ 13 C) zeigt, dass es während der C‐Stabilisierung zu einer Isotopenfraktionierung kommt. Freie Lipide machten weniger als 10 % des organischen C in den Unterbodenhorizonten aus. Die basische Hydrolyse zeigte hohe Anteile von Hydroxyalkansäuren in den B‐Horizonten des sauren Waldbodens. Die Hydrophobizität der organischen Substanz war nicht mit dem Gehalt an freien und/oder gebundenen Lipiden korreliert. Der Kontaktwinkel zeigte in allen Bodenhorizonten ähnliche Werte, so dass für die organische Substanz in den Unterbodenhorizonten mit ihren im Vergleich zu den A‐Horizonten sehr geringen C org. ‐Gehalten eine größere Hydrophobizität angenommen werden muss. Die Anzahl und chemische Zusammensetzung der Pyrolyseprodukte veränderte sich mit zunehmender Profiltiefe. Aliphatische Verbindungen konnten mit Curie‐Punkt‐Pyrolyse in den B‐ und C‐Horizonten nicht nachgewiesen werden.
    Type of Medium: Online Resource
    ISSN: 1436-8730 , 1522-2624
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2004
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  • 2
    Online Resource
    Online Resource
    Wiley ; 2021
    In:  The British Journal of Sociology Vol. 72, No. 5 ( 2021-12), p. 1430-1447
    In: The British Journal of Sociology, Wiley, Vol. 72, No. 5 ( 2021-12), p. 1430-1447
    Abstract: This article introduces the concept of “flexible reactivity” to describe and analyze a form of economic actors' response to multiple judgment devices. Using the example of government regulation in the Tuscan wine industry, we show that wineries can in part comply with the government's quality classifications system while, at the same time, also offering products outside the official classification system. Through this research, we provide novel insights into the role of judgment devices and contribute to a more nuanced understanding of organizational responses to institutional pressures. Extending prior institutional‐complexity research, our study illustrates that organizations' reactions to judgment devices are not limited to only the two options of either acquiescence or defiance. The third option—flexibile reactivity—encompasses an explicit combination of acquiescence and defiance at the actor level. Our findings shed new light on how organizations can cope with contradictory external demands such that contrasting logics compete for organizational resources and breed heterogeneous and continuously shifting product offerings.
    Type of Medium: Online Resource
    ISSN: 0007-1315 , 1468-4446
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 1491378-1
    detail.hit.zdb_id: 2984-1
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  • 3
    In: Allergy, Wiley, Vol. 75, No. 4 ( 2020-04), p. 746-760
    Type of Medium: Online Resource
    ISSN: 0105-4538 , 1398-9995
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2003114-2
    detail.hit.zdb_id: 391933-X
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  • 4
    In: The FEBS Journal, Wiley, Vol. 273, No. 21 ( 2006-11), p. 4817-4830
    Abstract: The Rieske [2Fe−2S] protein (ISP) is an essential subunit of cytochrome  bc 1 complexes in mitochondrial and bacterial respiratory chains. Based on the presence of two consecutive arginines, it was argued that the ISP of Paracoccus denitrificans , a Gram‐negative soil bacterium, is inserted into the cytoplasmic membrane via the twin‐arginine translocation (Tat) pathway. Here, we provide experimental evidence that membrane integration of the bacterial ISP indeed relies on the Tat translocon. We show that targeting of the ISP depends on the twin‐arginine motif. A strict requirement is established particularly for the second arginine residue (R16); conservative replacement of the first arginine (R15K) still permits substantial ISP transport. Comparative sequence analysis reveals characteristics common to Tat signal peptides in several bacterial ISPs; however, there are distinctive features relating to the fact that the presumed ISP Tat signal simultaneously serves as a membrane anchor. These differences include an elevated hydrophobicity of the h‐region compared with generic Tat signals and the absence of an otherwise well‐conserved ‘+5’‐consensus motif lysine residue. Substitution of the +5 lysine (Y20K) compromises ISP export and/or cytochrome  bc 1 stability to some extent and points to a specific role for this deviation from the canonical Tat motif. EPR spectroscopy confirms cytosolic insertion of the [2Fe−2S] cofactor. Mutation of an essential cofactor binding residue (C152S) decreases the ISP membrane levels, possibly indicating that cofactor insertion is a prerequisite for efficient translocation along the Tat pathway.
    Type of Medium: Online Resource
    ISSN: 1742-464X , 1742-4658
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2006
    detail.hit.zdb_id: 2173655-8
    detail.hit.zdb_id: 2172518-4
    SSG: 12
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  • 5
    In: The FASEB Journal, Wiley, Vol. 27, No. S1 ( 2013-04)
    Abstract: Duodenal mucosa needs efficient defence strategies against gastric acidity, while colonic mucosa counteracts damage by pathogens through the build‐up of an adherent mucus layer. Aim This study delineates the significance of the electroneutral Na + HCO 3 − cotransporter NBCn1 (Slc4a7) for duodenal defence against acid and for colonic mucus release. Methods and Results NBCn1 was localised to the basolateral membrane of duodenal villous enterocytes and of colonic crypt cells. Duodenal villous enterocyte pH i was studied before and during a luminal acid load by two‐photon microscopy in exteriorised, vascularly perfused, pH indicator‐loaded duodenum of anaesthetised mice. Acid‐induced HCO 3 − secretion was measured in vivo by single‐pass perfusion and pH‐stat titration. After a luminal acid load, NBCn1‐deficient duodenocytes were unable to rapidly recover from intracellular acidification and could not adequately respond with a protective HCO 3 − secretory response. Colonic mucus layer build‐up was delayed, and a decreased thickness of the adherent mucus layer was observed, suggesting that basolateral HCO 3 − uptake is essential for optimal colonic mucus release. Conclusions The electroneutral Na + HCO 3 − cotransporter NBCn1 is essential for intestinal mucosal protective functions, such as pH i ‐recovery and HCO 3 − secretion after an acid load in the duodenum, as well as mucus secretion in the colon.
    Type of Medium: Online Resource
    ISSN: 0892-6638 , 1530-6860
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2013
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    detail.hit.zdb_id: 639186-2
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  • 6
    In: Journal of Plant Nutrition and Soil Science, Wiley, Vol. 179, No. 6 ( 2016-12), p. 799-808
    Abstract: The drying process of volcanic ash soils often results in the formation of shrinkage cracks with consequences for their physical properties ( i.e ., decrease of water retention capacity) and land use management. This study presents the soil water characteristics and shrinkage behaviour (shrinkage phases in terms of void and moisture ratio), the shrinkage potential (COLE index), and the pore shrinkage capacity (PSI) for 5 and 20 cm depth of a Haplic Arenosol (tephric) and two Silandic Andosols under pasture management along a soil gradient from the Andean mountains to the coastal range in southern Chile. The main focus of the presented study is on the effect of soil development in conjunction with the weathering of volcanic ash soils on the shrinkage properties. The water retention and shrinkage curves were continuously determined for undisturbed soil samples (100 cm 3 ) during a drying process under laboratory conditions. In addition, the shrinkage curve data were modelled to distinguish different shrinkage zones. The results suggest that the investigated soil properties vary depending on soil development. The more developed Andosols had higher total porosities (up to 70 cm 3 cm −3 ) than the less developed Arenosol. The shrinkage behaviour of the Haplic Arenosol showed a wide structural shrinkage phase, whereas the Silandic Andosols revealed a more pronounced proportional shrinkage phase, which is related to the pore size distribution. In addition, wide and narrow coarse pores of the Haplic Arenosol and medium and fine pores of the Silandic Andosols determine the shrinkage potential (COLE) and the pore shrinkage capacity, respectively. The finer‐grained and organic matter‐rich Andosols indicate a higher COLE index ( 〉 0.03–0.09) compared to the Arenosol (≤ 0.03). The pore shrinkage index (PSI) of the total pores (TP) varied significantly ( P 〈 0.05) with values of 0.042–0.149 in 5 cm depth and 0.04–0.091 in 20 cm depth of sites 1–3, respectively.In summary, the shrinkage potential and pore shrinkage capacity are positively correlated to the organic carbon content and decrease with increasing dry bulk density. The study points out a higher risk of soil degradation due to irreversible drying processes for the more clayey and allophane containing Andosols than the Arenosol.
    Type of Medium: Online Resource
    ISSN: 1436-8730 , 1522-2624
    URL: Issue
    RVK:
    Language: English
    Publisher: Wiley
    Publication Date: 2016
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    detail.hit.zdb_id: 1470765-2
    SSG: 12
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  • 7
    In: Journal of Surgical Oncology, Wiley, Vol. 111, No. 3 ( 2015-03), p. 316-323
    Abstract: Cyclin D1 is an important regulator protein for the G1‐S cell cycle phase transition. The aim of this trial was to evaluate the impact of the CCND1 polymorphism G870A and corresponding protein expression and CCND1 amplification on the survival of the patients. Methods 425 patients with ductal pancreatic adenocarcinoma who underwent resection were included after histopathological confirmation. DNA was analyzed for Cyclin D1 polymorphisms, immunhistochemical examination and fluorescence in situ hybridization analysis of the tumor were performed. Results Overall, the mean survival was 22.9 months (20.5–25.3). The survival in patients with Cyclin D1 G870A polymorphism Adenine/Adenine was 15.1 months (95% CI 11.3–18.9), 21.5 months (17.4–25.6) for Adenine/Guanine, and 29.4 months (95% CI 23.8–35.0) for Guanine/Guanine ( P  = 0.003). A shorter survival was associated with strong/moderate protein expression in immunohistochemistry (IHC) compared to weak/no expression ( P  = 0.028). Additionally, a significant coherency between unfavourable polymorphism (AA/AG) and increased protein expression was detected ( P  = 0.005). Conclusions A strong impact on survival of Cyclin D1 G870A polymorphism and the detected corresponding protein expression was found. The biological mechanism of CCND1 in carcinogenesis has not been fully examined; but at present Cyclin D1 seems to be an interesting biomarker for the prognosis of ductal adenocarcinoma. J. Surg. Oncol. 2015 111:316–323 . © 2014 Wiley Periodicals, Inc.
    Type of Medium: Online Resource
    ISSN: 0022-4790 , 1096-9098
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2015
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    detail.hit.zdb_id: 1475314-5
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  • 8
    In: Journal of Magnetic Resonance Imaging, Wiley, Vol. 16, No. 2 ( 2002-08), p. 190-195
    Abstract: To determine the diagnostic value of a new ultrasmall superparamagnetic iron oxide Clariscan®, (NC100150) for the evaluation of renal perfusion in an animal model using a 3D‐FFE‐EPI sequence. Materials and Methods Four groups of four rabbits each were imaged after bolus injection of NC100150, using a 1.5 T MR system (Gyroscan ACS‐NT). T2*w MR images in the coronal plane were acquired over 60 seconds with an echo‐shifted 3D‐FFE‐EPI sequence (TR/TE/α = 18/25 msec/8°). Data were transferred to a workstation and converted into concentration curves. Based on the fitted concentration time curves, parameter maps were calculated pixelwise: bolus arrival time (T0), time‐to‐peak (TTP), mean transit time (MTT), and relative bolus volume (rBV). Maximum signal decrease was determined with respect to the baseline value. Results Mean MTT increased from 4.2 seconds at a dose of 0.25 mg to 5.9 seconds at 1.0 mg ( P 〈 .0001). The maximum signal decrease was observed at 0.75 mg, corresponding to 85% of the baseline value. Transit times of the contrast bolus were accurately calculated for the cortex and the outer medulla, but at the level of the inner medulla no arterial flow profile was identified. No significant difference between the cortex and the outer medulla was found for either T0 or rBV, but medullar TTP and MTT were prolonged with regard to cortical TTP and MTT (6.3 seconds vs. 5.7 seconds, P 〈 .001; 5.7 seconds vs. 4.2 seconds, P 〈 .0001). Conclusion The employed intravascular contrast agent is well suited to assess renal perfusion. By the use of a T2*w3D perfusion sequence, cortical and medullar transit times can be quantified and physiologic information on regional perfusion differences can be obtained. J. Magn. Reson. Imaging 2002;16:190–195. © 2002 Wiley‐Liss, Inc.
    Type of Medium: Online Resource
    ISSN: 1053-1807 , 1522-2586
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2002
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    detail.hit.zdb_id: 1497154-9
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  • 9
    In: BJU International, Wiley, Vol. 96, No. 2 ( 2005-08), p. 217-222
    Abstract: Bladder cancer is a frequent disease and represents the second most common genitourinary neoplasm. Although many aspects of the management of superficial bladder cancer are now well established, significant challenges remain, which influences patient outcome. Early detection and treatment of recurrent disease is required to optimize bladder preservation, reduce patient morbidity, and increase quality of life and survival. Fluorescence endoscopy, often referred to as ‘photodynamic diagnosis’ (PDD), with intravesical application of photosensitizing agents, has been developed to enhance the early detection of bladder cancer. There is growing evidence that PDD using 5‐aminolaevulinic acid (ALA), hexyl‐ALA ester or hypericin enhances the detection of bladder cancer, particularly of high‐grade flat lesions. Furthermore, transurethral resection of bladder tumour under fluorescence guidance reduces the risk of recurrent tumours. However, the impact on the progression of disease remains unclear and must be investigated in prospective randomized trials.
    Type of Medium: Online Resource
    ISSN: 1464-4096 , 1464-410X
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2005
    detail.hit.zdb_id: 1462191-5
    detail.hit.zdb_id: 2019983-1
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  • 10
    In: BJU International, Wiley, Vol. 102, No. 10 ( 2008-11), p. 1432-1439
    Abstract: To evaluate the intermediate‐term clinical efficacy and the rate of complications in 80 W photoselective vaporization of the prostate (PVP) with the potassium‐titanyl‐phosphate laser (Greenlight TM , (AMS, Minnetonka, MN, USA) compared with transurethral resection of the prostate (TURP) in a prospective non‐randomised two‐centre study. PATIENTS AND METHODS From December 2003 to August 2006, 396 patients (PVP 269, TURP 127) with lower urinary tract symptoms secondary to benign prostatic hyperplasia were included in the study. There was a significant difference in mean age (72 years for PVP vs 68 for TURP, P  = 0.001). Patients were therefore stratified in age categories ( 〈 70, 70–80, 〉 80 years) and compared for perioperative variables, functional outcome and complications, with a follow‐up of up to 24 months. RESULTS The mean prostate size was greater (overall, 62 vs 48 mL, P   〈  0.001) and mean operative duration longer (overall 72 vs 53 min; P  = 0.001) for PVP in all age categories. The rate of intraoperative bleeding (3% vs 11%), blood transfusions (0% vs 5.5%) and capsule perforations (0.4% vs 6.3%), and early postoperative clot retention (0.4% vs 3.9%) was significantly lower for PVP. Hospitalization time was significantly shorter in the PVP group for patients aged 〈 70 years (3.0 vs 4.7 days) and 70–80 years (4.0 vs 5.0 days; P  = 0.001). The improvement of peak urinary flow rate was higher after TURP for any age category. The International Prostate Symptom Score and postvoid residual volume during the follow‐up showed no significant difference. After 12 months the overall prostate size reduction was 63% (−30 mL) after TURP and 44% (−27 mL) after PVP. The rate of repeat TURP/PVP was higher in the PVP group (6.7% vs 3.9%, not significant) within the follow‐up of up to 2 years. The incidence of urethral and bladder neck strictures was comparable. CONCLUSIONS PVP was more favourable in terms of perioperative safety. Although patients assigned for PVP were older and had larger prostates, PVP resulted in a similar functional outcome. Further follow‐up is needed to draw final conclusions about the long‐term efficacy of PVP.
    Type of Medium: Online Resource
    ISSN: 1464-4096 , 1464-410X
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2008
    detail.hit.zdb_id: 1462191-5
    detail.hit.zdb_id: 2019983-1
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