This article discusses the characterization of a shell as labyrinthine in Theodoridas, Anth. Pal. 6.224 (= 3524–9 Gow–Page, HE). It contextualizes the description in relation to a myth about Daedalus on Sicily, Theodoridas’ probable homeland. It then reappraises the implications of the phrase for the aesthetics of the epigram.

Terrestrial gastropods can incorporate carbon from multiple sources, including 14C-depleted carbonate from limestone, known as the “Limestone Problem” (Goodfriend and Stipp 1983). This affects the reliability of 14C dating on terrestrial snails, and varies by species, habitat, and physiography, necessitating local validation studies. This study assessed whether two land snail taxa common in carbonate terrains of Florida (USA) accurately reflect atmospheric 14C concentration at the time of biomineralization, a necessary condition for accurate dating, or if they incorporate pre-aged carbon, leading to radiocarbon ages that are “too old.” Radiocarbon measurements were made on 11 modern, known-age specimens (collected 1967–2015) of the rosy wolfsnail (Euglandina rosea) and flatcoil (Polygyra spp.) snails, and results were compared to expected atmospheric values based on the Bomb21 NH2 calibration dataset (Hua et al. 2022). Specimens from carbonate terrains had significantly lower 14C activity than the contemporaneous atmosphere, while those from sandy terrains showed no such offsets. The magnitude of the offset varied by taxon. Flatcoils from carbonate terrains had the most unreliable dates, overestimated by 1350 ± 740 14C yr on average. Rosy wolfsnails from carbonate terrains had smaller offsets, overestimating by 270 ± 130 14C yr on average. The results suggest land snails from Florida will incorporate significant and variable amounts of pre-aged or “dead” carbonate in their shells if it is present in the landscape.

While divestments and decisions to exit commercial fossil fuel ventures are not new, the imperatives of the energy transition are catalysing such moves at a global industry-wide level, as oil companies position themselves for the future. The international normative framework for business and human rights provides clear guidance on how responsible divestment from fossil fuels should occur; however, in the absence of intergovernmental coordination and regulation, individual business divestment decisions create severe human rights risks. The case of Shell’s divestment from onshore Niger Delta oil production illustrates business and human rights issues relevant to the energy transition.

The complex tasks of air traffic control (ATC) and the various factors affecting its operation have shed light on the need to build a model to predict conflict detection and resolution (CDR) performance within a traffic situation. This study aimed at developing a fuzzy-hybrid framework for quantifying various aspects in ATC consisting of the software, hardware, environment, liveware and organisation (i.e. the SHELL model) to predict CDR performance. The proposed fuzzy-hybrid SHELL framework in this study was tested using metadata from 10 prior studies in ATC. The results showed a highly accurate prediction, as indicated by the RMSE and MAPE values of 0⋅09 and 5⋅36%, respectively, indicating a high consistency of 90⋅92% for predicting the CDR performance. This framework offers a promising approach for Air Navigation Service Providers (ANSPs) to maintain air traffic safety and improve ATC operations efficiency.

In many locations around the world, shell radiocarbon dates underpin archaeological research. The dating of shell brings the chronological relationship between the sample and target event (e.g., hunting and food preparation) into congruence, while shells are valuable geochemical proxies for understanding past climate dynamics and environments. However, this information can be lost as the shell, composites of biopolymers and carbonate minerals (mostly calcite and or aragonite), undergo diagenetic alteration. While studies into Pleistocene-age carbonates are common in the radiocarbon literature, there has been little research into the impact of alteration on Holocene-age shells used to interpret recent societal developments. The limits of our understanding of these diagenetic changes became evident when dating Placuna placenta (naturally calcitic) and Tegillarca granosa (naturally aragonitic) shells from the site of Thach Lac in Vietnam. These shells returned ages significantly younger than associated charcoal and terrestrial bone at the site, but standard tests for secondary recrystallization (XRD and staining techniques) did not indicate any alteration. Further investigation revealed that cryptic recrystallization (i.e., of the same crystal structure) had occurred in both the calcite and aragonite shells. This finding suggests recrystallization may have an undetected impact on some shell radiocarbon dates.

Many organisms living in the ocean create tests, shells, or related physical structures of calcium carbonate (CaCO3). As this is most often from dissolved inorganic carbon, using organisms that create calcium carbonate structures for climate research and dating purposes requires knowledge of the origin of carbon that is incorporated. Here, we give a short overview of research on marine carbonates over the last 60 years, especially that based on shell and coral samples. Both shells and corals exhibit annual growth patterns, like trees, and therefore offer possibilities for yearly resolution of past radiocarbon (14C) variations. We concentrate on their evolution in 14C dating including difficulties in determining reservoir ages as well as the possibilities they offer for archaeological dating, oceanography, calibration purposes as well as environmental research in general.

Foreign direct liability litigation against businesses is still a growing trend in European domestic courts, going on for over two decades.1 With absent effective remedies in host states, victims of human rights abuses committed by transnational corporations’ subsidiaries try to get access to remedy in the courts of the home states of the parent companies. A crucial factor for whether such cases can succeed, is the viability of the claims against the parent companies allegedly involved in the abuses. The principal legal route that victims have used to hold parent companies liable is through common law negligence claims.

Biogeochemical analyses of eastern oysters (Crassostrea virginica) are frequently included in environmental monitoring and paleoecological studies because their shells and soft tissues record environmental and dietary signals. Carbon isotopes in the mineral phase of the shell are derived from ambient bicarbonate and dissolved inorganic carbon (DIC), while organic carbon present in soft tissue is of dietary origin. Mineral-bound organic matter within the carbonate shell matrix (“conchiolin”) is studied less frequently. The purpose of this study was to compare carbon isotope composition (δ13C and Δ14C) of conchiolin to those of shell carbonates and soft tissues in eastern oysters and assess the extent to which conchiolin can provide insight into paleoecological records. Eleven oyster specimens were live-collected from Apalachicola Bay, USA, as well as a set of environmental samples (water, sediment, and terrestrial plants). Overall, the δ13C values in all studied oyster tissue types record environmental signals related to carbon sources, with conchiolin being enriched in 13C by an average of 2.3‰ relative to bulk soft tissues. Δ14C values in oyster shell carbonates generally reflect the marine versus riverine source of DIC, while conchiolin Δ14C values are impacted by variable relative contributions of young and old organic matter. Environmental samples indicate a significantly large difference in Δ14C among sources, from –127‰ in particulate organic matter to approximately +15‰ in DIC. Conchiolin is significantly depleted in 14C relative to other tissue types, by as much as 56.6‰, posing a major obstacle to the use of conchiolin as an alternative material for radiocarbon dating.

English common law and United Kingdom legislation provide various – overall liberal – jurisdictional grounds for hearing foreign tort claims. The article examines these grounds with reference to recent and ongoing oil pollution nuisance litigation involving Royal Dutch Shell Plc and its Nigerian subsidiary operating in the Niger Delta. Particular attention is given to the factors taken into account by the court in exercising its discretion to allow service out of the jurisdiction in cases of pollution taking place abroad under the principle of forum non conveniens. Following the widely commented decision of the United States Supreme Court in Kiobel v. Royal Dutch Petroleum Corporation, which ruled against the extraterritorial application of the Alien Tort Statute, it is easy to forget that the rules of jurisdiction vary from country to country and that different legal systems apply similar concepts in often radically different ways. Attention is also given to the future development of English jurisdictional law and practice in the context of environmental nuisance.

The generalized differential quadrature (GDQ) method is used to investigate the transient response of magnetostrictive functionally graded material (FGM) circular cylindrical shells. The effects of control gain value, thermal load temperature and power-law index on transient responses of dominant normal displacement and thermal stress are analyzed. With velocity feedback and suitable product values of coil constant by control gain in the magnetostrictive FGM shells can reduce the transient amplitude of displacement into a smaller value.

The hen's egg, in the form of table eggs and egg products, forms a staple part of the world's total protein consumption. In the last century, there has been considerable research effort focusing on ways of improving egg production and enhancing the quality of eggs. More recently, and with the development and application of new molecular technologies, our understanding and knowledge of how an egg is formed, what it actually consists of, in terms of its major versus minor components, and what the functional roles of each of these components might be, have been greatly enhanced. For example, new previously unknown molecules with specific activity or functional properties have been discovered in the egg albumen and yolk, some of which have potential uses in pharmaceutical and other food related applications. This review paper, which is the collaborative effort of members of Working Group 4 - Quality of Eggs and Egg Products - of the European Federation of WPSA, describes the scientific research behind a number of these major advances and provides some insight to the focus of current research in this area.

The overall legal framework for transnational petroleum development projects is arguably a conjunction between international investment law and several other fields of international law, notably environmental law and human rights. However, the relationship between these applicable fields of international law is uncertain. In particular, prospects for the application of environmental law within such projects appear to depend on the balance in political and economic power between the host State and any multinational/transnational oil companies involved in the project. This balance is usually in favour of investment protection for the economic actors involved but the enduring role of the host State as the sovereign regulatory power within the relevant jurisdiction cannot be denied. The general issues raised in this debate will be examined within the specific context of the Sakhalin II project in the Russian Far East, where the host government has intervened on the ostensible basis of ensuring environmental protection but arguably at the expense of investment protection.

‘Phalanx’ and ‘guerrilla’ phenotypes have been characterized as distinct, adaptive growth strategies exhibited by marine encrusting taxa, as well as a variety of other colonial taxa, that differ in patterns of colonial growth and areal expansion. Phalanx morphs exhibit compact growth, expanding outward concentrically and generating radially symmetric colony shapes, whereas guerrillas exhibit diffuse growth and typically elongate, asymmetric colony shapes. Several species in the colonial hydroid genus Hydractinia display inter-genotypic morphological variation in early developmental growth, although it is unclear if and how this growth form variation is tied to colony symmetry. Here I show that the phalanx versus guerrilla distinction does not adequately characterize genetic variation in Hydractinia growth form. Genotypes characterized by extreme mat and stoloniferous growth exhibited high levels of symmetry while genotypes generating growth forms intermediate between these two extremes were more asymmetric. Asymmetric growth is tied to reduced field fitness as a result of slower growth, reduced investment in future reproduction, and increased susceptibility to abiotic environmental stress. Asymmetric, guerrilla-like growth may be the morphological symptom of maladaptive growth early in colony development. This notion contrasts greatly with the traditional view of guerrilla growth as an adaptive strategy. Several hypotheses are proposed to address why asymmetric, guerrilla-like growth may be maladaptive in this and similar systems.

The larval shell morphology of 10 bivalve species of the family Mytilidae (Adula falcatoides, Crenella decussata, Crenomytilus grayanus, Modiolus kurilensis, Musculista senhousia, Mytilus coruscus, Mytilus galloprovincialis, Mytilus trossulus and Septifer keenae, and an unidentified species Mytilidae indeterminate) from the Sea of Japan is described. The following morphological features were comparatively examined: larval shell outlines including shape and size of umbones, and anterior, posterior and ventral margins, hinge morphology, ligament location, sculpture, colour, and eye-spot outlines. Some dimensional parameters of larval shells are given. The time interval of occurrence of larvae in the plankton, water temperature in this period, and shell length of competent larvae are presented. It is demonstrated that, in spite of sometimes similar external morphological characters, identification of mytilid larvae creates no difficulties if all distinguishing characters are used.