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  • 1
    In: Diagnostics, MDPI AG, Vol. 11, No. 7 ( 2021-07-08), p. 1231-
    Abstract: Neck management in patients with early-stage, clinically node-negative oral squamous cell carcinoma (OSCC) remains a matter of discussion. Sentinel lymph node biopsy (SLNB) represents a treatment alternative to avoid elective neck dissection (END) in this cohort and different protocols and tracers exist. Here we present the clinical outcome of SLNB using 99mTc-tilmanocept in a two-day protocol in patients suffering from early-stage OSCC. A total of 13 patients (males: 6; females: 7; mean age: 65.7 years, ranging from 47 to 89 years) were included in this study. Most of the patients suffered from an OSCC of the floor of mouth (n = 6), followed by tongue (n = 5) and upper alveolar crest/hard palate (n = 2). Sentinel lymph nodes (SLNs) were successfully identified in all cases (range: 1–7). The average length of hospital stay was 4.7 days (range: 3–8 days) and mean duration of surgical intervention was 121 min (range: 74–233 min). One patient who suffered from an OSCC of the tongue was sentinel lymph node positive (SLN+). The mean follow-up for all sentinel lymph node negative (SLN-) patients (n = 12) was 20.3 months (range: 10–28 months). No local or nodal recurrences were observed within the observation period. In our patient cohort, SLNB using 99mTc-tilmanocept in a two-day protocol proved to be a reliable and safe staging method for patients suffering from early-stage, clinically node-negative OSCC. These results and their possible superiority to colloid tracers have to be confirmed in a prospective randomized controlled study.
    Type of Medium: Online Resource
    ISSN: 2075-4418
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2662336-5
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  • 2
    Online Resource
    Online Resource
    MDPI AG ; 2018
    In:  Geosciences Vol. 8, No. 10 ( 2018-09-20), p. 356-
    In: Geosciences, MDPI AG, Vol. 8, No. 10 ( 2018-09-20), p. 356-
    Abstract: The effects of compaction on soil shrinkage behavior need to be considered for engineering long-term durable mineral liners of landfill capping systems. For this purpose, a new three-dimensional laser scanning device was coupled with a mathematical-empirical model to simultaneously determine the shrinkage behavior of a boulder marl (bm) and a marsh clay (mc). Therefore, both materials were precompacted in 200 soil cores (100 cm3) on the basis of the Proctor test results with five different degrees of compaction (bm1-bm5; mc1-mc5). Thus, the shrinkage behavior, intensity, and tendency were determined during a standardized drying experiment. The volume shrinkage index was used to describe the pore size dependent shrinkage tendency and was classified as high to very high (11.3–17.7%) for the marsh clay and medium (5.3–9.2%) for the boulder marl. Additionally, only the boulder marl (bm2), compacted up to 88% of Proctor density, could be installed as landfill bottom liner in drier locations if the local matric potentials did not exceed the previously highest observed drying range (i.e. values below −300 hPa), to avoid crack formation and generation.
    Type of Medium: Online Resource
    ISSN: 2076-3263
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2655946-8
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  • 3
    Online Resource
    Online Resource
    MDPI AG ; 2018
    In:  Geosciences Vol. 8, No. 10 ( 2018-10-10), p. 372-
    In: Geosciences, MDPI AG, Vol. 8, No. 10 ( 2018-10-10), p. 372-
    Abstract: Mineral temporary capping systems of landfills are required to accomplish the long-term coverage prerequisites or to use them as a basis layer prior to later permanent sealing. Such a capping system for a municipal waste landfill in Rastorf (Northern Germany) was developed and tested for its sealing capability on the basis of observed and simulated water balance components for the period between 2008 and 2015, considering observed local weather data and complemented by the Hydraulic Evaluation of Landfill Performance (HELP 3.95 D) model. The modeling results of this case study could be improved by the correction of previously used global solar radiation data due to the consideration of exposure and inclination angle of landfill surface areas. The model could positively be validated by comparing observed and simulated outflow (surface runoff and lateral drainage) data with R2 values ranging between 0.95 and 0.99, as well as for the leachate rates with R2 values of 0.78–0.87. The statistical-empirical HELP model was found useful in predicting the leachate generation of a temporary landfill capping system for specific soil and site conditions, even if only a restricted set of observed data was available.
    Type of Medium: Online Resource
    ISSN: 2076-3263
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2655946-8
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  • 4
    Online Resource
    Online Resource
    MDPI AG ; 2018
    In:  Sustainability Vol. 10, No. 11 ( 2018-11-02), p. 4025-
    In: Sustainability, MDPI AG, Vol. 10, No. 11 ( 2018-11-02), p. 4025-
    Abstract: The soil shrinkage behavior of mineral substrates needs to be considered for engineering long-term durable mineral liners of landfill capping systems. For this purpose, a novel three-dimensional laser scanning device was coupled with (a) a mathematical-empirical model and (b) in-situ tensiometer measurements as a combined approach to simultaneously determine the shrinkage behavior of a boulder marl, installed as top and bottom liner material at the Rastorf landfill (Northern Germany). The shrinkage behavior, intensity, and geometry were determined during a drying experiment with undisturbed soil cores (100 cm3) from two soil pits; the actual in-situ shrinkage was also determined in 0.2, 0.5, 0.8, and 1.0 m depth by pressure transducer tensiometer measurements during a four-year period. The volume shrinkage index was used to describe the pore size dependent shrinkage tendency and it was classified as low (4.9%) for the bottom liner. The in-situ matric potentials in the bottom liner ranged between −100 and −150 hPa, even during drier periods, thus, the previously highest observed drying range (pre-shrinkage stress) with values below −500 hPa and −1000 hPa was not exceeded. Therefore, the hydraulic stability of the bottom liner was given.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2518383-7
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  • 5
    In: Current Oncology, MDPI AG, Vol. 29, No. 2 ( 2022-02-10), p. 969-980
    Abstract: The number of patients under the age of 45 diagnosed with head and neck squamous cell carcinomas (HNSCC) is increasing, probably due to the incidence of oropharyngeal cancers. Comparisons of HNSCC in young and old patients regarding tumor site and survival in sample sizes of relevance are rarely published. The aim of the study was to analyze the differences in survival between age groups dependent on tumor site and the influence of oropharyngeal cancers on the rising rates of HNSCC in the young. The records of 4466 patients diagnosed with HNSCC were reviewed retrospectively. Patients younger than 45 years were divided further into four subgroups for specific age differences in the young. The influences of patient and clinicopathological characteristics on survival were assessed using Kaplan–Meier analyses. Among the patient cohort, 4.8% were younger than 45 years. Overall survival (OS) in these patients was better, with a 5-year OS of 66.1% (vs. 46.4%), while relapse-free survival (RFS) was better in the older patient population, with a 5-year RFS of 74.9% (vs. 68.1%). Decreased RFS in the young was found for advanced tumor stages and tumor sited at the larynx. Hypopharynx and advanced stages were independent risk factors for OS under 45 years. Overall, 44.4% of all HNSCC in patients under 30 years were nasopharyngeal cancers, and incidence decreased with age. The incidence of oropharyngeal cancers increased significantly with age. Better OS in the young may be explained by lower tumor and disease stages, whereas oropharyngeal tumors and HPV were not found to cause rising rates of HNSCC. Laryngeal malignancies in young patients might be related to an increased malignant potential and should, consequently, be treated as such.
    Type of Medium: Online Resource
    ISSN: 1718-7729
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2270777-3
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  • 6
    Online Resource
    Online Resource
    MDPI AG ; 2018
    In:  Geosciences Vol. 9, No. 1 ( 2018-12-20), p. 1-
    In: Geosciences, MDPI AG, Vol. 9, No. 1 ( 2018-12-20), p. 1-
    Abstract: Mineral landfill liners require legally-fixed standards including a sufficiently-high available water capacity (AWC) and relatively low saturated hydraulic conductivity values (Ks). For testing locally available and potentially suitable materials with respect to these requirements, the soil hydraulic properties of boulder marl (bm) and marsh clay (mc) were investigated considering a defined compaction according to Proctor densities. Both materials were pre-compacted in 20 soil cores (100 cm3) each on the basis of the Proctor test results at five degrees of compaction (bm1–bm5; mc1–mc5) ranging between 1.67–2.07 g/cm3 for bm and 1.09–1.34 g/cm3 for mc. Additionally, unimodal and bimodal models were used to fit the soil water retention curve near saturation and changes in the pore size distribution (PSD). The structural peak of the PSD in the fraction of pore volume between −30 and −60 hPa was more pronounced on the dry side (bm1–2, mc1–2) than on the wet side of the Proctor curve (bm4–5, mc4–5). Therefore, the loss in structural pores can be attributed to an increasing dry bulk density for bm and an increasing gravimetric moisture content during Proctor test for mc. While the mc fulfils the legal standards with AWC values between 0.244–0.271 cm3/cm3, the Ks values for bm between 1.6 × 10−6 m/s and 3.8 × 10−7 m/s and for mc between 7.4 × 10−7 m/s and 1.2 × 10−7 m/s were up to two orders of magnitude higher than required. These results suggest that the suitability of both materials as landfill liner is restricted.
    Type of Medium: Online Resource
    ISSN: 2076-3263
    Language: English
    Publisher: MDPI AG
    Publication Date: 2018
    detail.hit.zdb_id: 2655946-8
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