In this paper, an alignment-free bioinformatics technique, termed the 20D-Dynamic Representation of Protein Sequences, is utilized to investigate the similarity/dissimilarity between Baculovirus and Echinococcus multilocularis genome sequences. In this method, amino acid sequences are depicted as 20D-dynamic graphs, comprising sets of “material points” in a 20-dimensional space. The spatial distribution of these material points is indicative of the sequence characteristics and is quantitatively described by sequence descriptors akin to those employed in dynamics, such as coordinates of the center of mass of the 20D-dynamic graph and the tensor of the moment of inertia of the graph (defined as a symmetric matrix). Each descriptor unveils distinct features of similarity and is employed to establish similarity relations among the examined sequences, manifested either as a symmetric distance matrix (“similarity matrix”), a classification map, or a phylogenetic tree. The classification maps are introduced as a new way of visualizing the similarity relations obtained using the 20D-Dynamic Representation of Protein Sequences. Some classification maps are obtained using the Principal Component Analysis (PCA) for the center of mass coordinates and normalized moments of inertia of 20D-dynamic graphs as input data. Although the method operates in a multidimensional space, we also apply some visualization techniques, including the projection of 20D-dynamic graphs onto a 2D plane. Studies on model sequences indicate that the method is of high quality, both graphically and numerically. Despite the high similarity observed among the sequences of E. multilocularis, subtle discrepancies can be discerned on the 2D graphs. Employing this approach has led to the discovery of numerous new similarity relations compared to our prior study conducted at the DNA level, using the 4D-Dynamic Representation of DNA/RNA Sequences, another alignment-free bioinformatics method also introduced by us.

Unbalanced accelerations occurring during tram travel have a significant impact on passenger comfort and safety, as well as on the rate of wear and tear on infrastructure and rolling stock. Ideally, these dynamic forces should be monitored continuously in real-time; however, traditional systems require high-precision accelerometers and proprietary software—investments often beyond the reach of municipally funded tram operators. To this end, as part of the research project “Accelerometer Measurements in Rail Passenger Transport Vehicles”, pilot measurement campaigns were conducted in Poland on tram lines in Gdańsk, Toruń, Bydgoszcz, and Olsztyn. Off-the-shelf smartphones equipped with MEMS accelerometers and GPS modules, running the Physics Toolbox Sensor Suite Pro app, were used. Although the research employs widely known methods, this paper addresses part of the gap in affordable real-time monitoring by demonstrating that, in the future, equipment equipped solely with consumer-grade MEMS accelerometers can deliver sufficiently accurate data in applications where high precision is not critical. This paper presents an analysis of a subset of results from the Gdańsk tram network. Lateral (x) and vertical (z) accelerations were recorded at three fixed points inside two tram models (Pesa 128NG Jazz Duo and Düwag N8C), while longitudinal accelerations were deliberately omitted at this stage due to their strong dependence on driver behavior. Raw data were exported as CSV files, processed and analyzed in R version 4.2.2, and then mapped spatially using ArcGIS cartograms. Vehicle speed was calculated both via the haversine formula—accounting for Earth’s curvature—and via a Cartesian approximation. Over the ~7 km route, both methods yielded virtually identical results, validating the simpler approach for short distances. Acceleration histograms approximated Gaussian distributions, with most values between 0.05 and 0.15 m/s², and extreme values approaching 1 m/s². The results demonstrate that low-cost mobile devices, after future calibration against certified accelerometers, can provide sufficiently rich data for ride-comfort assessment and show promise for cost-effective condition monitoring of both track and rolling stock. Future work will focus on optimizing the app’s data collection pipeline, refining standard-based analysis algorithms, and validating smartphone measurements against benchmark sensors.

Background/Objectives: Optimal surgical margin management in penile squamous cell carcinoma remains debated because organ-preserving surgery must balance oncological control with functional preservation. Historically, wide excision margins have been recommended; however, subsequent evidence has challenged this threshold, shifting practice towards narrower margins without a demonstrated increase in local recurrence. We evaluated whether invasive positive surgical margins and minimal negative margin widths were associated with local recurrence and survival after surgery for penile squamous cell carcinoma. Methods: We retrospectively analysed 157 consecutive men who underwent surgical treatment at a single centre between 2011 and 2024. Time-to-event analyses were performed in 131 patients with invasive non-metastatic disease after excluding those with penile intraepithelial neoplasia (PeIN)-only lesions (n = 23) and distant metastases (n = 3) at diagnosis. The margins were classified as either invasive-negative or invasive-positive. Among histologically negative-margin cases, minimal margin width was grouped a priori as 5 mm. Results: The median follow-up was 25 months (interquartile range [IQR], 10–52). In the invasive (M0) cohort, 101/131 patients had invasive-negative margins and 30/131 had invasive-positive margins; local recurrence occurred in 42/131 patients. Margin status was not independently associated with recurrence-free, overall, or cancer-specific survival rates. Non-sparing surgery was associated with a lower hazard of local recurrence, whereas grade 3 (G3) histology independently predicted worse recurrence-free, overall, and cancer-specific survival. Advanced stage according to the Tumour, Node, Metastasis (TNM) classification independently predicted worse cancer-specific survival. Conclusions: Among patients with histologically negative margins, outcomes did not differ significantly across the predefined margin-width categories. These findings support tissue-preserving surgery aimed at histologically negative margins within a structured surveillance framework.

Background/Objectives: Histopathology-correlated evidence for preoperative magnetic resonance imaging (MRI) in penile cancer remains limited. We evaluated multiparametric MRI with artificially induced erection for local and nodal staging in surgically treated penile cancer. Methods: This prospective, single-centre diagnostic accuracy study included consecutive patients who underwent preoperative multiparametric MRI between 2017 and 2024, with postoperative histopathology as the reference standard. The primary endpoint was binary local T-staging (≤T1 vs. ≥T2). Secondary endpoints were three-category T-staging (≤T1/T2/≥T3) and binary nodal staging (N0 vs. N+) in patients with pathological nodal verification. Two radiologists independently reassessed all 38 examinations in a post hoc reproducibility analysis. Results: Thirty-eight patients were included; all tumours were glans-based and treated with organ-sparing surgery. Binary local staging showed 68.4% accuracy (95% CI, 52.5–80.9%), 88.2% sensitivity, 52.4% specificity, 60.0% positive predictive value, 84.6% negative predictive value, and balanced accuracy of 0.703 (95% CI, 0.568–0.838). Overstaging predominated (10 false-positive vs. 2 false-negative classifications; p = 0.043). Three-category exact agreement was 52.6% (κ = 0.257). In the pathologically verified nodal subset (n = 30), accuracy was 83.3% (95% CI, 66.4–92.7%), sensitivity 78.6%, specificity 87.5%, and balanced accuracy 0.830 (95% CI, 0.691–0.970). Inter-reader agreement was 92.1% for binary T staging (κ = 0.837) and 97.4% for binary N staging (κ = 0.943). Conclusions: mpMRI was sensitive but insufficiently specific for ≥T2 disease and should not independently trigger treatment escalation. Nodal performance was encouraging but arose from a guideline-selected verified subset. These findings apply primarily to glans-based, organ-preserving cohorts and do not establish an incremental benefit of erection induction.