The fossil record of medusozoan cnidarians is relatively sparse and, in some cases, contentious. Here, we describe a new genus and species of a well-preserved, soft-bodied, tubicolous polyp, Paleocanna tentaculum n. gen. n. sp., from the Upper Ordovician (Katian) Neuville Formation in Québec. These fossils, preserved as carbonaceous compressions, were found in association with typical shelly assemblages. Fifteen slabs of shaly limestone containing ~ 135 specimens of Paleocanna tentaculum n. gen. n. sp. were examined. Individual polyps occupied upright tubes, which occur either solitarily or in clusters. Some tubes exhibit a striated periderm near their base. The polyp is elongated, with a rounded aboral end and a consistent ring of tentacles protruding distally from the tube. A phylogenetic analysis of 69 taxa and 236 discrete morphological characters indicated that the species is more closely related to the crown clade including Staurozoa, Cubozoa, Scyphozoa than to other fossil medusozoans, e.g., conulariids and carinachitids. The uniform orientation of specimens on single slabs suggests rapid burial. Paleocanna tentaculum n. gen. n. sp. represents an exceptionally preserved member of an Ordovician deposit exhibiting Burgess Shale-type soft-tissue preservation.

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Vitamin A deficiency (VAD) is common among pregnant women (PW) and has been associated with anaemia and adverse birth outcomes. However, in the Free State Province of South Africa, evidence regarding this is limited. Hence, this cross-sectional study investigated the vitamin A (vitA) intake and status of PW in Bloemfontein and its association with anaemia, iron status and birth outcomes. Blood was taken from 427 PW to assess the status of vitA (retinol-binding protein 4 (RBP4)), iron (ferritin, soluble transferrin receptor (sTfR)) and anaemia (Hb). Sociodemographic, HIV, birth outcomes (birthweight and gestational age) and dietary vitA intake data were obtained using a questionnaire in an interview and medical records. Descriptive statistics and linear regression were used to describe variables and the association between vitA and iron status and birth outcomes. Median vitA intake was 1007 µgRAE/d with 19 % of participants’ intake below the estimated average requirement of 550 µgRAE/d. Median (IQR) RBP4 was 1·51 (0·78) µmol/l. Insufficient vitA status and VAD prevalence were 12·2 % and 1·2 %, respectively. VitA intake was positively associated with RBP4 (β = 0·068; 95 % CI 0·020, 0·116; P = 0·006). RBP4 was positively associated with Hb (β = 0·363; 95 % CI 0·186, 0·539; P < 0·001) and ferritin (β = 0·359; 95 % CI 0·139, 0·579; P = 0·001) but negatively with sTfR (β = −0·125; 95 % CI −0·246, −0·005; P = 0·041). No significant association between plasma RBP4 and birth weight, as well as preterm birth, was observed. There was a low prevalence of VAD in the study population. Nonetheless, the positive association between RBP4 and Hb and ferritin highlights the importance of optimal vitA status in preventing anaemia in pregnancy.

We compute the Galois groups of the reductions modulo a prime number p of the generating series of Apéry numbers, Domb numbers and Almkvist–Zudilin numbers. We observe in particular that their behaviour is governed by congruence conditions on p.

The notion of $\theta $-congruent numbers generalises the classical congruent number problem. A positive integer n is $\theta $-congruent if it is the area of a rational triangle with an angle $\theta $ whose cosine is rational. Das and Saikia [‘On $\theta $-congruent numbers over real number fields’, Bull. Aust. Math. Soc. 103(2) (2021), 218–229] established criteria for numbers to be $\theta $-congruent over certain real number fields and concluded their work by posing four open questions regarding the relationship between $\theta $-congruent and properly $\theta $-congruent numbers. In this work, we provide complete answers to those questions. Indeed, we remove a technical assumption from their result on fields with degrees coprime to six, provide a definitive answer for real cubic fields without congruence restrictions, extend the analysis to fields of degree six and examine the exceptional cases $n=1, 2, 3$ and $6$.

The set of sums of two squares plays a significant role in number theory. We establish the existence of several rich monochromatic configurations in the natural numbers by exploiting algebraic structures induced by the set of sums of two squares. The proofs rely on algebraic properties arising from the induced structures on the Stone–Čech compactification of the natural numbers.

The integration of phenotypic, genomic and pedigree data into a single-step model for predicting genomically enhanced estimated breeding values (GEBVs) has become crucial for the accurate genetic evaluation of dairy cattle. This study compared two widely used software implementations, MiXBLUP and BLUPF90IOD3, for the prediction of breeding values using the single-step G-BLUP model based on data from the Polish national evaluation for stature. Four core animal sets were tested, which differed in the selection of bulls and cows. The GEBVs were predicted and validated using different subsets of the population. Both software packages resulted in high correlations (0.89 and 0.97) between full and truncated dataset predictions and similar validation performance, with MiXBLUP exhibiting slightly greater consistency across different sets of core animals. The ranking of the top 50 bulls remained stable across the implementations. This study concludes that both software implementations provide comparable GEBV predictions, suggesting that software choice should consider computational efficiency, cost and modeling flexibility, with MiXBLUP offering additional options for GEBV estimation.

We report a new species of stem ibis (Threskiornithidae) from the early Eocene Fossil Butte Member of the Green River Formation. Rhynchaeites mcfaddeni n. sp. is represented by an articulated partial skeleton and was a diminutive species, with an estimated body mass of under 300 g. The holotype specimen is preserved in an unusual manner, leaving the skull, presacral vertebral column, wings, and feet in approximate life position despite the loss of the trunk, pelvis, tail, and upper legs. This peculiar mode of preservation may represent a case of the “stick ‘n’ peel” model of preservation, by which a portion of a carcass becomes firmly adhered to the sediment by substances released during decay. Like other members of the stem ibis genus Rhynchaeites, Rhynchaeites mcfaddeni n. sp. lacks the dense pitting of the bill tip associated with abundant Herbst corpuscles, which is developed in extant ibises. However, the new species differs from all stem and crown ibises in possessing a sharply tapering beak tip, which suggests a unique mode of foraging, possibly including prying mollusks from their shells. Given that Rhynchaeites messelensis Wittich, 1898 is one of the most common birds in the prolific Messel deposits but Rhynchaeites mcfaddeni n. sp. is represented by a single specimen after more than 50 years of intense collecting in the Green River Formation, it is likely the two species had divergent foraging strategies, with the former perhaps feeding closer to the lake margin and the latter in streams.

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We report an exceptionally early diagnosis of a Kommerell diverticulum on the first day of life, distinguished by unusual mid-ductal aneurysmal dilatation of the patent ductus arteriosus. Serial echocardiography documented the serial evolution of spontaneous ductal closure and thrombosis formation. CT confirmed a right aortic arch with a retroesophageal Kommerell diverticulum. The infant remains asymptomatic under close surveillance. This case represents one of the youngest reported cases with serial imaging documentation, providing unique insights into the early natural history and highlighting management challenges in asymptomatic neonatal patients.

This study investigated changes in serum folate and B12, and associations with endurance performance and bone outcomes, in women during military training. Women (n 137) had serum folate and B12, haematological markers and endurance performance (2·4 km run) measured at the start (week 1) and end (week 13) of British Army basic training. Whole-body areal bone mineral density and markers of bone metabolism were measured at week 1. Training decreased serum folate (mean change (95 % CI), −2·3 (−3·0, −1·6) nmol ∙ l−1, P < 0·001), B12 (−16 (−32, 0) pmol ∙ l−1, P = 0·042), Hb (−0·7 (−0·9, −0·5) g ∙ dl−1, P < 0·001) and erythrocyte count (−0·2 (−0·3, −0·2) × 10^9 ∙ l−1, P < 0·001), but had no effect on mean corpuscular volume (P = 0·438) or erythrocyte distribution width (P = 0·088). There was no association between serum folate, serum B12, Hb or erythrocyte count with run time (P ≥ 0·518). Serum B12 was not associated with areal bone mineral density or bone metabolism at week 1 (P ≥ 0·152). Higher serum folate was associated with lower plasma c-telopeptide cross-links of type I collagen (standardised β (95 % CI) = −0·31 (−0·48, −0·15), P < 0·001), but not whole-body bone mineral density or plasma procollagen type I N-terminal propeptide (P ≥ 0·152). Serum folate and B12 decreased after military training in women, resulting in a high prevalence of folate deficiencies at the end of training. Low serum folate may contribute to increased bone resorption, the implications of which are unclear.

Authoritarian regimes have increasingly leveraged foreign media to project influence within democracies, yet evidence of these co-opted outlets’ actual effects remains scarce. This study presents findings from a field experiment conducted during Taiwan’s 2020 general election, assessing the impact of The China Times, a Beijing-backed media conglomerate, on voter behavior and attitudes. The experiment incentivized participants to engage in sustained consumption of real-time news from this outlet in the weeks leading up to the election. Results from a panel survey linked to individual-level web-tracking data reveal that exposure to The China Times sways voters in favor of the People’s Republic of China (PRC). These effects, however, are primarily driven by nonpartisan and PRC-friendly voters. To the extent that I find effects among PRC-skeptics, they show evidence of backfiring. As Beijing’s media co-optation extends beyond Taiwan, my findings have broader implications for understanding the effectiveness and limitations of authoritarian influence operations.

Dilute Temperley–Lieb algebras are variants of Temperley–Lieb algebras arising in statistical mechanics in the study of solvable lattice models. In this article, we prove that the (co)homology of dilute Temperley–Lieb algebras vanishes in all positive degrees.

Though critic Paul Scudo predicted in 1850 that the French romance would be ‘more respected by posterity than many weighty scores’, the once-ubiquitous song genre has all but disappeared from modern recitals and musicological histories. While the reasons for this erasure are undoubtedly multifaceted, I argue that the loss of the vocal performance practices that animated the genre played a significant role. Specifically, French singers in the domestic sphere – commonly labelled ‘romance singers’ and exemplified by figures like the tenor Richelmi – cultivated an entirely different vocal production than the one popularzied by Gilbert Duprez and typically heard in classical singing today. This technique, known as the timbre clair (clear timbre), was produced using a rising larynx and a lowering soft palate, resulting in a bright, thin, delicate, and even slightly nasal sound that became a hallmark of early and mid-nineteenth-century French singing. Moreover, composers and audiences expected singers to adopt a declamatory approach when performing romances, to constantly vary the colour of their voices for expressive effect. By so doing, performers imbued these seemingly simple songs with a sophistication and nuanced meaning not readily apparent in the scores themselves. This study of timbral aesthetics – which, I suggest, ought to be more seriously explored in modern performance contexts – undercuts conceptions of the genre as vacuous or meaningless and sheds light on an essential aspect of the nineteenth-century French sound world.

Traced monoidal categories model processes that can feed their outputs back to their own inputs, abstracting iteration. The category of finite-dimensional Hilbert spaces with the direct sum tensor is not traced. But surprisingly, in 2014, Bartha showed that the monoidal subcategory of isometries is traced. The same holds for coisometries, unitary maps, and contractions. This suggests the possibility of feeding outputs of quantum processes back to their own inputs, analogous to iteration. In this paper, we show that Bartha’s result is not specifically tied to Hilbert spaces, but works in any dagger additive category with Moore–Penrose pseudoinverses (a natural dagger-categorical generalization of inverses).

This article examines the institutional evolution and professionalization of the state police in Prague during the final decades of the Habsburg monarchy, arguing that the transformation of the Prague State Police between 1893 and 1910 represents a proactive effort in modern state-building. Drawing on reports from the Prague Police Directorate and the Bohemian Governor’s Office, it analyzes how recurring episodes of mass violence—specifically the unrest of the early 1890s, the riots of December 1897, and the nationalist disturbances of 1908—exposed the structural vulnerabilities of a security apparatus designed for routine policing rather than mass politics.

The article highlights a significant shift in administrative strategy: the movement away from a reliance on military intervention, which was increasingly viewed by civil authorities as a “double defeat” that undermined the legitimacy of the constitutional state. Instead, police directors such as Georg Dörfl and Karel Křikava successfully advocated for a robust, civilian-controlled force characterized by increased manpower, modernized equipment, and the establishment of a dedicated reserve for professional training. By 1910, the Prague Guard had largely expanded, reflecting a fundamental reconceptualization of urban order where protest was accepted as an unavoidable feature of political life to be contained by professional civilian forces rather than crushed by the army.

We study the classical relationship between a firm’s investment and q, for which an unobserved persistent shock is an important factor in the investment decision. In our setting, besides the potential measurement problem of q, controlling for the unobserved shock becomes a new challenge. We develop an estimation method that addresses both econometric issues given timing and information set assumptions. Using 16,256 unique public firms in the United States from 1975 to 2021, we find that q remains a significant factor of investment even after controlling for the unobserved shock and measurement error.