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992 result(s) for "Geiger, Daniel"
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Studies in Oberonia, 9: Lessons from excess names in Oberonia for Orchidaceae systematics, including a revision of the Oberonia Sect. Scytoxiphium
The reasons for excess names in microfloral orchids such as Oberonia Lindl. can be traced to poor scholarship (e.g., failure to review the literature, ignoring expert advice), typological thinking, and erroneous assumption of microendemism. Some extraordinarily poor descriptions, including some from the 21st century, can be termed “taxonomic vandalism”. The outdated reliance on drawings as opposed to z-stacked photographs and scanning electron micrographs poses further problems due to an abundance of demonstrable problems with drawings. The Oberonia sect. Scytoxiphium Schltr. with eight described species is reduced to one species, Oberonia heliophila Rchb.f.; it is illustrated by original drawings, live photographs and scanning electron microscope images. The distribution is extended from Java through Micronesia and Samoa. The species occurs predominantly from 0–500 m, less frequently to 900 m, and possibly to even 1900 m. It flowers throughout the year. Keywords/Palabras clave: Oberonia, Oberonia sect. Scytoxiphium, revision, revisión, synonymies, sinonimias, taxonomic vandalism, vandalismo taxonómico
Analysis of IBNR Liabilities with Interevent Times Depending on Claim Counts
We extend a recently proposed stochastic loss reserving model for liabilities from incurred but not reported (IBNR) micro-level claims. We propose viewing the number of claims from an event as a measure of catastrophic severity. This view covers catastrophes with arbitrarily many classes of magnitude. Our Markovian model allows the time between disasters to depend on the previous event’s level of severity. Simultaneously, we let the discount rate vary in the same manner. First, we find the moments of IBNR liabilities in our model. Then, we permit a later time horizon for IBNR claims when considered jointly with incurred and reported claims.
Hepatocellular carcinoma in cirrhotic patients: prospective comparison of US, CT and MR imaging
Objectives To prospectively compare the diagnostic performance of ultrasound (US), multidetector computed tomography (MDCT) and contrast-enhanced magnetic resonance imaging (MRI) in cirrhotic patients who were candidates for liver transplantation. Methods One hundred and forty consecutive patients with 163 hepatocellular carcinoma (HCC) nodules underwent US, MRI and MDCT. Diagnosis of HCC was based on pathological findings or substantial growth at 12-month follow-up. Four different image datasets were evaluated: US, MDCT, MRI unenhanced and dynamic phases, MRI unenhanced dynamic and hepatobiliary phase. Diagnostic accuracy, sensitivity, specificity, PPV and NPV, with corresponding 95 % confidence intervals, were determined. Statistical analysis was performed for all lesions and for three lesion subgroups (<1 cm, 1-2 cm, >2 cm). Results Significantly higher diagnostic accuracy, sensitivity and NPV was achieved on dynamic + hepatobiliary phase MRI compared with US, MDCT and dynamic phase MRI alone. The specificity and PPV of US was significantly lower than that of MDCT, dynamic phase MRI and dynamic + hepatobiliary phase MRI. Similar results were obtained for all sub-group analyses, with particular benefit for the diagnosis of smaller lesions between 1 and 2 cm. Conclusions Dynamic + hepatobiliary phase MRI improved detection and characterisation of HCC in cirrhotic patients. The greatest benefit is for diagnosing lesions between 1 and 2 cm. Key Points • US, CT and MRI can all identify HCC in cirrhotic patients • US has good sensitivity but suffers from false-positive findings • Dynamic CT and MR have similar diagnostic performance for diagnosing HCC • Dynamic + hepatobiliary phase MRI significantly improves detection and characterisation of HCC • The greatest benefit is for the diagnosis of lesions between 1 and 2 cm
Anticipatory Action in River Flooding Risk Management in Nigeria: An Assessment of Community‐Level Implementation
Across the world, communities face annual and increasingly extreme flood events, yet there is a widespread lack of proactive preparedness. This failure to anticipate and mitigate flood risks deepens the damages experienced, stalling development, undermining environmental sustainability, and driving many communities deeper into poverty. Anticipatory action has emerged as a proactive strategy in river flood risk management, aiming to reduce vulnerabilities and enhance community resilience before disasters strike. This study assesses the implementation of anticipatory action strategies in Nigeria by building on qualitative data to assess community vulnerabilities and capacities. Findings indicate that over 70% of the total number of respondents in the selected nine communities in Nigeria lacked access to timely early warnings, and more than half viewed floods as unavoidable, reducing their engagement in long‐term resilience planning. Communities demonstrated a stronger preference for short‐term relief over proactive preparedness for disasters. Findings reveal a convergence of structural and behavioral vulnerabilities within the population. This highlights the study's contribution by connecting behavioral insights with anticipatory frameworks in high‐risk communities. The study shows that there is a clear need for community‐driven approaches that combine anticipatory action with economic support, sustained engagement, and other adaptive measures. By closing both behavioral and structural gaps, more effective anticipatory action policies can be institutionalized.
MICROINVERTEBRATES FROM SEDIMENT SAMPLES
Deep-sea microinvertebrates are even less well understood than their larger counterparts, as they frequently fall through collection nets. Seventeen sediment samples were collected with scoop, core, or slurp, yielding 26 quart jars of material. Some larger specimens of special interest to Santa Barbara Museum of Natural History researchers were also gathered, including three lots of Brachiopoda, larger snails (Bathybembix bairdii, Neptunea amianta, Calliostoma variegatum), large clams (Acesta sphonii), and a mystery brachiopod/bivalve specimen, unidentifiable from video footage, that turned out to be the clam Dimya californiana.
Narratives in knowledge sharing: challenging validity
Purpose - This paper aims at extending research on narrative knowledge sharing in organizations. Current literature often assumes that narratives can provide orientation and guidance in complex task environments by conveying embedded actionable problem-solving knowledge or practices. In this paper an empirical example of narrative-based knowledge sharing is used as a starting point to explore knowledge sharing via narratives in more detail. It turns out to be a much more ambiguous and problematic exercise than previous studies assume.Design methodology approach - The paper is a conceptual paper but uses a case vignette from Shell to exemplify the problem of narrative-based knowledge sharing discussed in the paper.Findings - A possible model shall be outlined showing how inconsistent and questionable narratives could be handled in order to provide orientation. It concludes with stressing the importance of reflecting on narratives and suggests a generative interplay between narrative and argumentative modes of communication in knowledge sharing.Originality value - The paper is actually the first which deals systematically with the shortcomings of a narrative mode of knowledge sharing. It explores the potential problems and outlines some suggestions of how these problems could be addressed theoretically and practically.
Biosynthetic approach to combine the first steps of cardenolide formation in Saccharomyces cerevisiae
A yeast expression plasmid was constructed containing a cardenolide biosynthetic module, referred to as CARD II, using the AssemblX toolkit, which enables the assembly of large DNA constructs. The genes cloned into the vector were (a) a Δ5‐3β‐hydroxysteroid dehydrogenase gene from Digitalis lanata, (b) a steroid Δ5‐isomerase gene from Comamonas testosteronii, (c) a mutated steroid‐5β‐reductase gene from Arabidopsis thaliana, and (d) a steroid 21‐hydroxylase gene from Mus musculus. A second plasmid bearing an ADR/ADX fusion gene from Bos taurus was also constructed. A Saccharomyces cerevisiae strain bearing these two plasmids was generated. This strain, termed “CARD II yeast”, was capable of producing 5β‐pregnane‐3β,21‐diol‐20‐one, a central intermediate in 5β‐cardenolide biosynthesis, starting from pregnenolone which was added to the culture medium. Using this approach, five consecutive steps in cardenolide biosynthesis were realized in baker's yeast. We describe the construction of a novel yeast strain capable to reconstitute an important part of the cardenolide pathway in Digitalis plants. The intermediates are synthesized from a simple steroid in correct stereospecific manner with the help of five heterologously expressed genes from different bacteria, plants, and mammals.
Quantitative 3D ultrashort time-to-echo (UTE) MRI and micro-CT (μCT) evaluation of the temporomandibular joint (TMJ) condylar morphology
Objective Temporomandibular dysfunction involves osteoarthritis of the TMJ, including degeneration and morphologic changes of the mandibular condyle. The purpose of this study was to determine the accuracy of novel 3D-UTE MRI versus micro-CT (μCT) for quantitative evaluation of mandibular condyle morphology. Materials and methods Nine TMJ condyle specimens were harvested from cadavers (2 M, 3 F; age 85 ± 10 years, mean ± SD). 3D-UTE MRI (TR = 50 ms, TE = 0.05 ms, 104-μm isotropic-voxel) was performed using a 3-T MR scanner and μCT (18-μm isotropic-voxel) was also performed. MR datasets were spatially registered with a μCT dataset. Two observers segmented bony contours of the condyles. Fibrocartilage was segmented on the MR dataset. Using a custom program, bone and fibrocartilage surface coordinates, Gaussian curvature, volume of segmented regions, and fibrocartilage thickness were determined for quantitative evaluation of joint morphology. Agreement between techniques (MRI vs. μCT) and observers (MRI vs. MRI) for Gaussian curvature, mean curvature, and segmented volume of the bone were determined using intraclass correlation coefficient (ICC) analysis. Results Between MRI and μCT, the average deviation of surface coordinates was 0.19 ± 0.15 mm, slightly higher than the spatial resolution of MRI. Average deviation of the Gaussian curvature and volume of segmented regions, from MRI to μCT, was 5.7 ± 6.5 % and 6.6 ± 6.2 %, respectively. ICC coefficients (MRI vs. μCT) for Gaussian curvature, mean curvature, and segmented volumes were 0.892, 0.893, and 0.972, respectively. Between observers (MRI vs. MRI), the ICC coefficients were 0.998, 0.999, and 0.997, respectively. Fibrocartilage thickness was 0.55 ± 0.11 mm, as previously described in the literature for grossly normal TMJ samples. Conclusions 3D-UTE MR quantitative evaluation of TMJ condyle morphology ex-vivo, including surface, curvature, and segmented volume, shows high correlation against μCT and between observers. In addition, UTE MRI allows quantitative evaluation of the fibrocartilaginous condylar component.
Getting Ahead of Time—Performing Temporal Boundaries to Coordinate Routines under Temporal Uncertainty
In this ethnographic study of firefighters we explore how routines are coordinated under high levels of temporal uncertainty—when the timing of critical events cannot be known in advance and temporal misalignment creates substantial risks. Such conditions render time-consuming incremental and situated forms of temporal structuring—the focus of previous research on temporal coordination—unfeasible. Our findings show that firefighters focused their efforts on enacting temporal autonomy or, as they called it, \"getting ahead of time.\" They gained temporal autonomy—the capacity to temporally uncouple from the unfolding situation to preserve the ability to adapt to autonomously selected events—by relying on rhythms they developed during training in performing individual routines and by opening up to the evolving situation only when transitioning between routines. Our study contributes to literature on temporal structuring by introducing temporal autonomy as a novel strategy for dealing with temporal contingencies. We also contribute to research on routine dynamics by introducing the performance of temporal boundaries as a previously unrecognized form of coordination within and among routines. Finally, we contribute to process research a method that allows analyzing complex temporal patterns and thus provides a novel way of visualizing processes.
Unravelling the Motor of Patterning Work: Toward an Understanding of the Microlevel Dynamics of Standardization and Flexibility
This paper examines how routine patterns are recognized as either stable or flexible and which mechanisms are enacted to maintain this patterning work. We address this question through an ethnographic case study analyzing how a catastrophe management organization enacts routines in a highly dynamic setting. Our findings first of all reveal that patterns described by the participants as either stable or flexible were nevertheless both performed differently in each iteration of the routine. Our microlevel analysis shows that to enact patterns that participants perceive as stable, participants had to carry out specific aligning and prioritizing activities that lock-stepped performances. In contrast, participants perceive patterns as flexible when they enact specific selecting and recombining activities. Building on these observations, we add to extant routine literature by (1) differentiating between stability, standardization, flexibility, and change of routines and by (2) providing new insights on mindfulness in accounting for the microlevel activities enacted to orient toward a pattern that enhances standardization or flexibility in dynamic contexts. Moreover, (3) our insights point to the centrality of knowing for the enactment and recognition of patterning work.