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Obligate brood parasitism is a peculiar behaviour found in some bird species. The costs for their hosts can be high, generating selection for active defence strategies including foreign egg and chick rejection. Only one of these two rejection strategies seems to be expressed in any given host species, which in turn selects for mimicry in parasites only at one stage of the nesting cycle. Here, I review the cues used by hosts to recognise brood parasites in the nest and the behaviours to neutralise them, as well as counteradaptations found in parasites. Furthermore, I link these adaptations with theoretical and known processes of genetic transmission of the involved mimicry traits to the offspring. I suggest that the stage at which the parasite is recognised by the host can impose selection on the mating system of the parasite and increase the likelihood of speciation. When hosts discriminate against foreign eggs, interbreeding by male and female parasites reared by different hosts may impede speciation, but not the evolution of egg mimicry if inherited through the maternal line (via the W‐chromosome). When hosts discriminate against chicks, an effective mimetic phenotype requires autosomal (or Z‐chromosome) inheritance to allow expression in both male and female chicks, thus favouring assortative mating in the parasites, and potentially leading to speciation. To my knowledge, this review is the first to link host defence strategies with their potential consequences for speciation in brood parasites. I suggest future steps to fill knowledge gaps in brood parasitism. [ABSTRACT FROM AUTHOR]

Plant resistance (R) genes play a crucial role in the detection of effector proteins secreted by pathogens, either directly or indirectly, as well as in the subsequent activation of downstream defence mechanisms. However, little is known about how R genes regulate the defence responses of conifers, particularly Pinus massoniana, against the destructive pine wood nematode (PWN; Bursaphelenchus xylophilus). Here, we isolated and characterised PmHs1pro‐1, a nematode‐resistance gene of P. massoniana, using bioinformatics, molecular biology, histochemistry and transgenesis. Tissue‐specific expressional pattern and localisation of PmHs1pro‐1 suggested that it was a crucial positive regulator in response to PWN attack in resistant P. massoniana. Meanwhile, overexpression of PmHs1pro‐1 was found to activate reactive oxygen species (ROS) metabolism‐related enzymes and the expressional level of their key genes, including superoxide dismutase, peroxidase and catalase. In addition, we showed that PmHs1pro‐1 directly recognised the effector protein BxSCD1of PWN, and induced the ROS burst responding to PWN invasion in resistant P. massoniana. Our findings illustrated the molecular framework of R genes directly recognising the effector protein of pathology in pine, which offered a novel insight into the plant–pathogen arms race. Summary statement: We first identified and functionally characterised that PmHs1pro‐1 could directly recognise the effector protein BxSCD1, which consequently initiated the ROS burst to defend against pine wood nematode to prevent the withered appearance in the resistant Pinus massoniana. Our findings demonstrated the molecular framework of R genes directly recognising the effector protein of pathology in pines and offered a novel insight into the plant‐arm race of pathogens and plants. [ABSTRACT FROM AUTHOR]

While conflict pervades virtually every aspect of society, there have been relatively few crossovers between Regional Science and Peace Science. This paper pays tribute to Walter Isard, pioneer of peace science research, and Kieran Donaghy, who has contributed to research on arms race dynamics and macroeconomic stability. We review studies that examine the impact of (i) trade on conflict, (ii) the economy on militarized disputes, and (iii) conflict on economic development. The analysis develops a structural equation model (SEM) to test the hypotheses simultaneously using the Correlates of War project data. Consistent with the liberal proposition, we found that the pacifying effect of trade is robust across alternative SEM specifications. Controlling for standard explanatory variables, the SEM estimates reveal that the indirect impact of economic development on conflict mediated by trade is statistically significant at the 0.1-percent level. Trade is, therefore, a critical intervening variable that transforms conflict-inducing economic expansion into a pacifying influence on militarized disputes. The spatial version of the SEM confirms that democracies do not attack each other. While trade does not appear to have a local spillover effect on conflict, proximity to neighboring democracies does lead to fewer conflicts. The final hypothesis argues that conflict affects national economic performance, which Donaghy refuted in his 1995 Conflict Management and Peace Science paper. Consistent with Donaghy's finding, the estimates reject the claim that conflict disrupts economic stability. The conclusion section discusses the implications for Kieran Donaghy's larger body of work. [ABSTRACT FROM AUTHOR]

The paper presents evidence on the relationship concerning military spending among Southeast Mediterranean countries (Greece – Turkey, Israel – Egypt, Israel – Turkey) over the period 1962–2020. We account for the presence of nonlinearities in the bilateral relationships of defence spending by applying Threshold Autoregressive methodologies and utilize kink regression analysis to detect the existence of a country's military spending threshold that signals a threat to another country of the region. Our empirical results show: First, there is a nonlinear strategic interaction between the countries examined, in the sense that their defence spending policy is cointegrated. Second, there is no arms race among the countries examined, but only unilateral effects. Third, there is consistent evidence of a possible military spending equilibrium, in the absence of friction between the countries involved (peace threshold). Our findings have important policy implications as they indicate, first, that each country in the region should not determine its level of military spending considering only operational factors, but also considering the signaling of its military spending on its neighboring countries and, second, that there is space for peaceful solutions regarding disputes in the Southeast Mediterranean region. [ABSTRACT FROM AUTHOR]

Three types of plant-insect interactions are identified on seeds from the lower Permian (Asselian) Shanxi and lower Shihhotse formations of the Taiyuan district, North China. This enhances the relatively meagre fossil record of seed predation in global late Paleozoic floras, adding the earliest record of granivory from Cathaysia. The dispersed seeds cannot be attributed with confidence to any particular plant group, but associated fossil leaves belong to a broad spectrum of plants, including Medullosales, Cycadales, Noeggerathiales, Gigantopteridales, Cordaitales, and Voltziales. Among 85 analysed seeds, six showed evidence of predation, referable to three damage types: DT074 and two new damage types that will be added to the forthcoming version of the fossil damage guide (DT274, DT430). These damage features indicate novel strategies of seed exploitation in the earliest Permian of China. The causal agents of the seed herbivory are difficult to resolve with certainty, but possible culprits include representatives of Palaeodictyopteroidea, although we cannot exclude other groups, such as Dictyoptera, Odonatoptera, Archaeorthoptera, Hemipteroidea or early holometabolan insects. The presence of damage features, together with a range of probable defensive structures (hairs, spines, apical horns, and thick integuments), suggests that an active arms race involving insects and plant reproductive structures was already well established by the early Permian. [ABSTRACT FROM AUTHOR]

Antagonistic co-evolution can be asymmetric, where one species lags behind another. Asymmetry in a predator–prey context is expressed by the 'life–dinner principle', a classic informal model predicting that prey should be in some sense ahead in this arms race, since prey are running for their lives, while predators lag as they only run for their dinner. The model has undergone surprisingly little theoretical scrutiny. We derive analytical models that show coevolutionary outcomes do not always align with the life–dinner principle. Our results show that other important asymmetries can easily reverse the outcome, especially the rare-enemy principle: predators are usually outnumbered by their prey, sometimes substantially (trophic asymmetry), which can make selection on prey relatively weak. We additionally show that the antagonists typically exhibit different evolutionary responses to a situation where both predator and prey start out as equally fast runners. Although predators sometimes become so efficient that attacks always succeed, attack success often reaches a stable intermediate value. We conclude that the life–dinner principle has some validity as a metaphor, but its effect is of an 'all else being equal' type, which is surprisingly easily overridden by other features of the evolutionary dynamics. [ABSTRACT FROM AUTHOR]

Transposable elements (TEs) are mobile parasitic sequences that have expanded within the host genome. It has been hypothesized that host organisms have expanded the Krüppel-associated box-containing zinc finger proteins (KRAB-ZFPs), which epigenetically suppress TEs, to counteract disorderly TE transpositions. This process is referred to as the evolutionary arms race. However, the extent to which this evolutionary arms race occurred across various TE families remains unclear. In the present study, we systematically explored the evolutionary arms race between TE families and human KRAB-ZFPs using public ChIP-seq data. We discovered and characterized new instances of evolutionary arms races with KRAB-ZFPs in endogenous retroviruses. Furthermore, we found that the regulatory landscape shaped by this arms race contributed to the gene regulatory networks. In summary, our results provide insight into the impact of the evolutionary arms race on TE families, the KRAB-ZFP family, and host gene regulatory networks. [ABSTRACT FROM AUTHOR]

Holobionts are highly organized assemblages of eukaryotic hosts, cellular microbial symbionts, and viruses, whose interactions and evolution involve complex biological processes. It is largely unknown which specific determinants drive similarity or individuality in genetic diversity between holobionts. Here, we combine short- and long-read sequencing and DNA-proximity-linkage technologies to investigate intraspecific diversity of the microbiomes, including host-resolved viruses, in individuals of a model marine sponge. We find strong impacts of the sponge host and the cellular hosts of viruses on strain-level organization of the holobiont, whereas substantial overlap in nucleotide diversity between holobionts suggests frequent exchanges of microbial cells and viruses at intrastrain level in the local sponge population. Immune-evasive arms races likely restricted virus-host co-evolution at the intrastrain level, generated holobiont-specific genome variations, and linked virus-host genetics through recombination. Our work shows that a decoupling of strain- and intrastrain-level interactions is a key factor in the genetic diversification of holobionts. Marine host-associated microbiomes retain a tremendous pool of genetic diversity, which is key to the health of marine ecosystems. This study on reef sponges shows that genomic diversification of individual microbiomes follows different rules at strain- and intrastrain-levels. [ABSTRACT FROM AUTHOR]

Democracies in the Indo-Pacific are facing an increasingly competitive and securitized environment, as China turns more assertive and the US-China rivalry escalates. Disruptions include uncertainty about the global economic order, technological decoupling, an arms race amidst intense hot spots, an economic security spiral, and larger systemic risks around climate change, AI governance, etc. Countries such as Japan and Korea are actively responding to these risks through a strategic approach to economic security and increased defense spending, active alliance development, and parallel continued investment in global institutions and dialogue. Canada must be jolted out of its-business-as-usual approach and take a cue from its closest partners in Asia. This includes investing rapidly in its security (2% of defense over GDP) and the creation of an economic security council under the Prime Minister. Canada should also join its key partners in effectively investing in key global institutions in times of crisis. [ABSTRACT FROM AUTHOR]

Copyright of University of Sharjah Journal of Law Sciences (JLS) is the property of University of Sharjah - Scientific Publishing Unit and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The United States emerged as a naval competitor of Great Britain after the First World War. American naval ambitions exasperated Winston Churchill, who saw this challenge threatening Britain's position as the world's leading sea power. Faced by America's growing economy and navy, Churchill lamented Britain's decline as a world power. He confided to his wife Clementine: 'Poor old England – she is being slowly but surely forced into the shade'. Despite America's undoubted economic strength, Churchill was determined that Britain stay ahead of the United States in the naval arms race. My article examines Churchill's views about America's growing naval power and Britain's ability to compete against the United States. Examining Churchill's views in this period provides an opportunity to explore the question of how the leading world power responded to a rising international great-power challenger. [ABSTRACT FROM AUTHOR]

As the resident Foreign Office expert on air disarmament during the World Disarmament Conference, Allen Leeper was at the forefront of a campaign for the elimination of military aircraft as a radical bid to address German claims to equality and French demands for security. His motivations derived from a deep-seated fear that legitimising a German air force posed an unacceptable risk to European stability by provoking an all-out arms race, heightening continental tensions and raising the spectre of war. But Leeper's sweeping solution for military aircraft, with its intertwined repercussions for civil aviation, fell victim to an increasingly truculent government in Berlin that refused to delay equality, claimed substantial increases in German military strength and boosted defence spending while surreptitiously rearming behind the scenes. In these altered circumstances, Leeper abandoned disarmament as a diplomatic tool for treating the Franco-German question and, instead, resorted to other traditional methods for ensuring continental stability. In doing so, he displayed the strengths of the 'world leadership' school of foreign-policy making that placed a premium on Britain's active engagement in great power politics to uphold its position as the pre-eminent global power. [ABSTRACT FROM AUTHOR]

The New Arms Race encapsulates a dynamic geopolitical competition characterized by escalating military capabilities and strategic posturing between the U.S and China. Amidst the intensifying Sino-US arms race, the objective of this research is to examine the trends and patterns of Sino-US defense spending's (2010-2022) to analyze the evolving military competition's strategic, economic and social implications, contributing to the discourse on global security and stability. Data from reputable sources like SIPRI, IISS, plus official budget reports and defense White-Paper's inform the analysis. Using a mix-method approach, quantitative data is descriptively presented to highlight trends, patterns, and significant changes over time. Plus, qualitative analysis is conducted to interpret the implications of these expenses, drawing on International Relation's theories and expert opinions to assess how shifts in military spending influences power dynamics, alliances, and conflicts? The results show that, the global military expenditures surpassed $2240 billion. China's defense spending has seen a 29-year consecutive increase, while the US maintains its top spender status, propelled by ongoing modernization efforts and diverse geopolitical strategies. This study is Grounded in the "Security Dilemma" framework, assumes that potential enemies would view a country's attempts to strengthen its security as a threat, setting off a cycle of action and reaction that deepens mutual suspicions and contributes to the potential for an arms race. Due to the Sino-US ongoing military modernization plans and diverse geopolitical strategies, it is suggested that this tendency will persist in the foreseeable future. [ABSTRACT FROM AUTHOR]

Copyright of Marmara University Journal of Political Science / Marmara Üniversitesi Siyasal Bilimler Dergisi is the property of Marmara University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of International Interactions is the property of Routledge and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

There is an ongoing arms race intensifying today between Algeria and Morocco. The article examines the root causes of this arms race, namely, its links to the Western Sahara Conflict. The article focuses not only on the strains this conflict has caused in the diplomatic relations between the two neighbouring Maghrebi states but also on the increase in arms expenditures by both states. One key point the article addresses regards the authoritarian politics in both Algeria and Morocco that the arms race and the Western Sahara conflict have caused. [ABSTRACT FROM AUTHOR]

Heterochromatin is a gene-poor and repeat-rich genomic compartment universally found in eukaryotes. Despite its low transcriptional activity, heterochromatin plays important roles in maintaining genome stability, organizing chromosomes, and suppressing transposable elements. Given the importance of these functions, it is expected that genes involved in heterochromatin regulation would be highly conserved. Yet, a handful of these genes were found to evolve rapidly. To investigate whether these previous findings are anecdotal or general to genes modulating heterochromatin, we compile an exhaustive list of 106 candidate genes involved in heterochromatin functions and investigate their evolution over short and long evolutionary time scales in Drosophila. Our analyses find that these genes exhibit significantly more frequent evolutionary changes, both in the forms of amino acid substitutions and gene copy number change, when compared to genes involved in Polycomb-based repressive chromatin. While positive selection drives amino acid changes within both structured domains with diverse functions and intrinsically disordered regions, purifying selection may have maintained the proportions of intrinsically disordered regions of these proteins. Together with the observed negative associations between the evolutionary rate of these genes and the genomic abundance of transposable elements, we propose an evolutionary model where the fast evolution of genes involved in heterochromatin functions is an inevitable outcome of the unique functional roles of heterochromatin, while the rapid evolution of transposable elements may be an effect rather than cause. Our study provides an important global view of the evolution of genes involved in this critical cellular domain and provides insights into the factors driving the distinctive evolution of heterochromatin. [ABSTRACT FROM AUTHOR]

Over the years, international elite sport has developed into an 'arms race' with the success of national elite sport systems becoming a symbol of regime superiority. During the Cold War, the Eastern and Western Blocs battled for success in various sports disciplines. The former nations were dominating in terms of medals, symbolising the force of the socialist autocratic system. However, because of the fall of the Iron Curtain in 1989, Western liberal democracies had the opportunity to gain more strength. In this paper, we aim to test whether this has happened by analysing the association between political regime type and international sporting success at the Winter and Summer Olympic Games in the post-Cold War Period. We do this by deploying data on the political regime types to a set of regression models, finding that democratic nations have taken over the international sporting arms race at the Summer Olympic Games. For the Winter Games, our results indicate that less democratic countries (anocracies) are in the lead. Our results add to existing research by suggesting that political regime type still matters to international sporting success. Implications for stakeholders, sports managers, and politicians are that they must decide to what extent they want to be part of this game in the coming years. [ABSTRACT FROM AUTHOR]

Coevolution is often found in parasite–host interactions, but has not yet been described for hemiparasitic plants and their hosts. Root hemiparasites like Rhinanthus alectorolophus perform photosynthesis but also parasitize other plant species, some of which (e.g. Plantago lanceolata) may defend themselves against parasite attack by blocking the haustoria of the parasites. We grew seedlings of the hemiparasite R. alectorolophus and the potential host P. lanceolata from seven grassland sites in a factorial design. To detect differences in host defence, we also included hosts from two 'naïve' populations from regions where the parasite does not occur. R. alectorolophus grew consistently larger and had higher fitness with sympatric than with allopatric hosts, suggesting parasite adaptation to local host populations. Moreover, R. alectorolophus remained smallest with allopatric hosts from the same region and reached intermediate sizes with allopatric hosts from other regions or naïve hosts, suggesting host adaptation to parasites at the regional scale. Parasite presence reduced the size of the host plants already after four weeks, but only that of hosts with 'experience' of the parasite, suggesting an early host response. Follow‐up experiments confirmed that parasites attach to hosts already after four weeks and hosts respond by changing belowground allocation patterns. However, parasite roots did not preferentially grow towards sympatric hosts. Our results suggest that local adaptation to hosts can occur even in generalist parasites and does not require specialization on individual hosts. We discuss the role of potential mechanisms, including variation in chemical signalling (early) and in host defence (late effects). [ABSTRACT FROM AUTHOR]

Structural Maintenance of Chromosomes (SMC) complexes are an evolutionary conserved protein family. In most eukaryotes, three SMC complexes have been characterized, as follows: cohesin, condensin, and SMC5/6 complexes. These complexes are involved in a plethora of functions, and defects in SMC genes can lead to an increased risk of chromosomal abnormalities, infertility, and cancer. To investigate the evolution of SMC complex genes in mammals, we analyzed their selective patterns in an extended phylogeny. Signals of positive selection were identified for condensin NCAPG, for two SMC5/6 complex genes (SMC5 and NSMCE4A), and for all cohesin genes with almost exclusive meiotic expression (RAD21L1, REC8, SMC1B, and STAG3). For the latter, evolutionary rates correlate with expression during female meiosis, and most positively selected sites fall in intrinsically disordered regions (IDRs). Our results support growing evidence that IDRs are fast evolving, and that they most likely contribute to adaptation through modulation of phase separation. We suggest that the natural selection signals identified in SMC complexes may be the result of different selective pressures: a host-pathogen arms race in the condensin and SMC5/6 complexes, and an intragenomic conflict for meiotic cohesin genes that is similar to that described for centromeres and telomeres. [ABSTRACT FROM AUTHOR]

Mutualisms constitute a diverse class of ecologically important interactions, yet their ecological and evolutionary stability remain topics of debate in coevolutionary theory. Recent theoretical and empirical work has suggested that coevolutionary arms races may be involved in the maintenance of mutualistic interactions, sustaining mutually beneficial outcomes for interacting species while producing exaggerated traits. Here we present an individual-based model that evaluates how asynchronous life histories—that is, partners with different average lifespans—change the dynamics of trait coevolution, the expected fitness outcomes for species involved, and the dynamics of selection differentials across time for each species. Results indicate that a longer-lived mutualist will consistently "lose" an otherwise balanced coevolutionary arms race, being outpaced in both the mean trait value and fitness outcome compared with a shorter-lived partner. Furthermore, linear selection differentials on mutualistic traits become increasingly divergent as life histories become increasingly asynchronous, with the longer-lived species experiencing persistent directional selection and the shorter-lived species experiencing weaker, more inconsistent selection. These results suggest that asynchronous life histories can complicate the maintenance of mutualistic interactions via coevolutionary arms races and that detecting coevolution via selection differentials may be difficult when life histories are sufficiently divergent. [ABSTRACT FROM AUTHOR]

In this study, the author examines the foreign policy of Y.V. Andropov and assesses the impact of his personal position on the Soviet-US and Sino-Soviet relations during his tenure as the leader of the Soviet Union. The author was guided by the principles of historicism, scientific objectivity, and reliance on sources. It is proved that Y.V. Andropov adopted the foreign policy of the USSR from the position of the “hawks” in the Soviet leadership, which were represented by D.F. Ustinov. According to such a position, foreign policy should be absolutely subordinated to the interests of national security, which can only be guaranteed by the superiority of both nuclear and conventional forces over potential adversaries. Military power should be at the forefront of foreign policy decisions. Therefore, no matter on the issue of Intermediate-Range Nuclear Forces (INF) in Europe, or on the issue of the armed forces on the Sino-Soviet and Sino-Mongolian borders, regardless of the objective changes in the situation, Y.V. Andropov always maintained a tough position. Author proves that the Soviet leader persistently rejected the reasonable proposals of diplomats and was unwilling to make any concessions that contradicted the ideas of military supremacy. This primarily concerned the issue of the INF deployment on the territory of Eastern Europe, which was a key topic of discussion at the Geneva negotiations. As a result, the Soviet Union could not avoid being drawn into the new round of the arms race provoked by the U.S. President Ronald Reagan, one of the results of which was the deployment of the American INF in Western Europe. In the East, he missed the opportunity to improve relations with China, which had begun to reorient itself away from confrontation with the USSR to building a balance in relations with the United States and the Soviet Union and continued a pointless confrontation with it. The foreign policy heritage that Y.V. Andropov left to his successors was an isolated and tense external environment in which there was few freedom of action. In addition, the growth of military expenditures caused by his tough line on foreign affairs aggravated the stagnation and crisis in the social-economic development of the USSR.

The relationship between the nuclear arms race and strategic stability has been important for scholars, politicians, and journalists who have shown keen interest in what causes a state to augment its military power and its effects on its rivalries with other states. As emerging technologies continue to change the security calculus of the states, the arms race is on for investing in the development and acquisition of offensive and defensive technologies in South Asia. The Indian strategic cooperation with the technologically advanced countries and the increase in the defense budget confirm its military modernization while upsetting the delicacies of the conventional military balance in South Asia. This study gives a substantive background to the developments and technological advancements in the post overt nuclearization era (1998) in the context of complications posed by India's persistent animus dominandi to outpace Pakistan in an anarchic structure vis-à-vis its impact on strategic instability in South Asia by making a comprehensive analysis of an unending arms race for the maintenance of credible minimum deterrence. [ABSTRACT FROM AUTHOR]

The amenity arms race among post-secondary institutions is driving the new development or expansion of campus recreation facilities. However, investing in new and larger campus recreation facilities may not necessarily translate into usage and ultimately provide the associated benefits to students. This study explored whether human resource capacity and program capacity are mechanisms that help explain the conditions under which facility capacity translates into facility usage. Secondary data were obtained from NIRSA's research and assessment initiative from post-secondary institutions in the United States (n = 103) that contained measures of relevance to this study. Regression analyses with bootstrapping were conducted to examine the hypothesized relationships including mediation. Results identified that an indirect only mediation model (full mediation) was present, such that greater facility capacity translates into increased facility usage through human resource capacity and program capacity. Therefore, recreation professionals and programs are indicated as pivotal to making the most of facility capacity. [ABSTRACT FROM AUTHOR]

The United States is in a developing military confrontation with China over Taiwan. China has built long-distance precision strike missiles to prevent US Navy task forces from participating effectively. The early Cold War confrontation between the Soviet Union and United States over West Berlin provides a relevant precedent. There is a significant probability a war between China and the United States could escalate to nuclear threats or even use. Recently, China has launched a major buildup of its nuclear forces. It is urgent that the two countries launch talks on nuclear arms control, both to prevent a nuclear arms race and to reassure each other that both want to avoid a nuclear conflict. Citizens should reengage with their governments to urge alternatives to a new nuclear arms race, and US scientists should brainstorm with their Chinese counterparts about nuclear risks and risk reduction. [ABSTRACT FROM AUTHOR]

Strategic documents of the European Union (EU) in the space sphere are analyzed in this Article. It is concluded that despite the active use of the “space doctrine” concept in the EU, regulating public legal relations through the establishment and adoption of the corresponding branch doctrine it is not an ongoing practice. The author substantiates the view that the “space doctrine” concept is not sufficiently studied today. Despite the claim that the term “doctrine” is of military origin, security and defense doctrine can be a tool of command, of education, or transformation. The dialectic-materialistic method of cognition was used as a general scientific method, which enabled to carry out a comprehensive scientific analysis of doctrinal provisions in the development of the concept of the EU space doctrine, which is proposed to be used as a unifying term for the latest European acts in the field of space security and defense.

Coevolution between predator and prey plays a central role in shaping the pelagic realm and may have significant implications for marine ecosystems and nutrient cycling dynamics. The siliceous diatom frustule is often assumed to have coevolved with the silica-lined teeth of copepods, but empirical evidence of how this relationship drives natural selection and evolution is still lacking. Here, we show that feeding on diatoms causes significant wear and tear on copepod teeth and that this leads to copepods becoming selective feeders. Teeth from copepods feeding on thick-shelled diatoms were more likely to be broken or cracked than those feeding on a dinoflagellate. When fed a large diatom, all analyzed teeth had visible wear. Our results underscore the importance of the predator-prey arms race as a driving force in planktonic evolution and diversity. [ABSTRACT FROM AUTHOR]

Transposable elements (TEs) are genomic parasites found in nearly all eukaryotes, including humans. This evolutionary success of TEs is due to their replicative activity, involving insertion into new genomic locations. TE activity varies at multiple levels, from between taxa to within individuals. The rapidly accumulating evidence of the influence of TE activity on human health, as well as the rapid growth of new tools to study it, motivated an evaluation of what we know about TE activity thus far. Here, we discuss why TE activity varies, and the consequences of this variation, from an evolutionary perspective. By studying TE activity in nonhuman organisms in the context of evolutionary theories, we can shed light on the factors that affect TE activity. While the consequences of TE activity are usually deleterious, some have lasting evolutionary impacts by conferring benefits on the host or affecting other evolutionary processes. [ABSTRACT FROM AUTHOR]

The phylum Nucleocytoviricota comprises a diverse group of double-stranded DNA viruses that display a wide range of gene repertoires. Although these gene repertoires determine the characteristics of individual viruses, the evolutionary processes that have shaped the gene repertoires of extant viruses since their common ancestor are poorly characterized. In this study, we aimed to address this gap in knowledge by using amalgamated likelihood estimation, a probabilistic tree reconciliation method that infers evolutionary scenarios by distinguishing origination, gene duplications, virus-to-virus horizontal gene transfer (vHGT), and gene losses. We analyzed over 4,700 gene families from 195 genomes spanning all known viral orders. The evolutionary reconstruction suggests a history of extensive gene gains and losses during the evolution of these viruses, notably with vHGT contributing to gene gains at a comparable level to duplications and originations. The vHGT frequently occurred between phylogenetically closely related viruses, as well as between distantly related viruses with an overlapping host range. We observed a pattern of massive gene duplications that followed vHGTs for gene families that was potentially related to host range control and virus–host arms race. These results suggest that vHGT represents a previously overlooked, yet important, evolutionary force that integrates the evolutionary paths of multiple viruses and affects shaping of Nucleocytoviricota virus gene repertoires. [ABSTRACT FROM AUTHOR]

The Congressional Commission on the Strategic Posture of the United States has urged Washington to adopt new measures to maintain a credible nuclear deterrent against Russia and China in a deteriorating security environment. Any effort by the United States to match its two nuclear peers warhead for warhead, delivery system for delivery system, would be costly folly, potentially reprising the Cold War arms race. A qualitative rather than quantitative response may well be more effective. Developing nuclear-capable hypersonic glide vehicles and cruise missiles, though challenging, would improve Washington's ability to shape an opponent's decision calculus and reduce its capacity to pursue deterrence by denial. These systems would also enhance the United States' ability to hold at risk multiple high-value, well-defended targets and reinforce planners' confidence in retaliatory strikes. Finally, a qualitative focus would enable the US to argue more credibly for quantitative limitations at levels similar to or lower than those existing today. [ABSTRACT FROM AUTHOR]

The coevolution of bacteria and bacteriophages has created a great diversity of mechanisms by which bacteria fight phage infection, and an equivalent diversity of mechanisms by which phages subvert bacterial immunity. Effective and continuous evolution by phages is necessary to deal with coevolving bacteria. In this study, to better understand the connection between phage genes and host range, we examine the isolation and genomic characterization of two bacteriophages, JNUWH1 and JNUWD, capable of infecting Escherichia coli. Sourced from factory fermentation pollutants, these phages were classified within the Siphoviridae family through TEM and comparative genomic analysis. Notably, the phages exhibited a viral burst size of 500 and 1,000 PFU/cell, with latent periods of 15 and 20 min, respectively. They displayed stability over a pH range of 5 to 10, with optimal activity at 37°C. The complete genomes of JNUWH1 and JNUWD were 44,785 bp and 43,818 bp, respectively. Phylogenetic analysis revealed their close genetic relationship to each other. Antibacterial assays demonstrated the phages' ability to inhibit E. coli growth for up to 24 h. Finally, through laboratory-driven adaptive evolution, we successfully identified strains for both JNUWH1 and JNUWD with mutations in receptors specifically targeting lipopolysaccharides (LPS) and the lptD gene. Overall, these phages hold promise as additives in fermentation products to counter E. coli, offering potential solutions in the context of evolving bacterial resistance. [ABSTRACT FROM AUTHOR]

We argue that attempting to quantify open-endedness misses the point: The nature of open-endedness is such that an open-ended system will eventually move outside its current model of behavior, and hence outside any measure based on that model. This presents a challenge for analyzing Artificial Life systems, leading us to conclude that the focus should be on understanding the mechanisms underlying open-endedness, not simply on attempting to quantify it. To demonstrate this, we apply several measures to eight long experimental runs of the spatial version of the Stringmol automata chemistry. These experiments were originally designed to examine the hypothesis that spatial structure provides a defense against parasites. The runs successfully show this defense, but also show a range of innovative, and possibly open-ended, behaviors involved in countering a parasitic arms race. Commencing with system-generic measures, we develop and use a variety of measures dedicated to analyzing some of these innovations. We argue that a process of analysis, starting with system-generic measures but going on to system-specific measures, will be needed wherever the phenomenon of open-endedness is involved. [ABSTRACT FROM AUTHOR]

This paper focuses on the actors in the new emerging Cold War. In the last century, the world was experiencing a phase of geopolitical rivalry between two major powers, commonly referred to as the Cold War. After surviving fifty years of proxy warfare, sanctions, arms race, and security concerns between the two dominant worldwide factions, the struggle finally came to an end. The USA exerted significant influence over the western bloc, while the Soviet Union dominated the eastern bloc. The global geopolitical scenario has seen substantial transformations in the twenty-first century. The global landscape has shifted towards a multipolar configuration, resulting in conflicts that have highly unorthodox characteristics. China, being a major player, actively engages in world politics and is enjoying a fair share in a market economy and the development of infrastructure. Amid the ongoing global quest for dominance, Europe is experiencing an emergence of new dynamics, each with its unique alliances and ideas. This article aims to analyze the potential for collaboration and conflict between the major players in the emerging global power transition during the early stages of this Cold War. [ABSTRACT FROM AUTHOR]

Arms race dynamics are a common outcome of host–parasite coevolution. While they can theoretically be maintained indefinitely, realistic arms races are expected to be finite. Once an arms race has ended, for example due to the evolution of a generalist-resistant host, the system may transition into coevolutionary dynamics that favour long-term diversity. In microbial experiments, host–parasite arms races often transition into a stable coexistence of generalist-resistant hosts, (semi-)susceptible hosts, and parasites. While long-term host diversity is implicit in these cases, parasite diversity is usually overlooked. In this study, we examined parasite diversity after the end of an experimental arms race between a unicellular alga (Chlorella variabilis) and its lytic virus (PBCV-1). First, we isolated virus genotypes from multiple time points from two replicate microcosms. A time-shift experiment confirmed that the virus isolates had escalating host ranges, i.e., that arms races had occurred. We then examined the phenotypic and genetic diversity of virus isolates from the post-arms race phase. Post-arms race virus isolates had diverse host ranges, survival probabilities, and growth rates; they also clustered into distinct genetic groups. Importantly, host range diversity was maintained throughout the post-arms race phase, and the frequency of host range phenotypes fluctuated over time. We hypothesize that this dynamic polymorphism was maintained by a combination of fluctuating selection and demographic stochasticity. Together with previous work in prokaryotic systems, our results link experimental observations of arms races to natural observations of long-term host and parasite diversity. Graphical Abstract [ABSTRACT FROM AUTHOR]

Host immune responses are tightly controlled by various immune factors during infection, and protozoan parasites also manipulate the immune system to evade surveillance, leading to an evolutionary arms race in host‒pathogen interactions; however, the underlying mechanisms are not fully understood. We observed that the level of superoxide dismutase 3 (SOD3) was significantly elevated in both Plasmodium falciparum malaria patients and mice infected with four parasite species. SOD3-deficient mice had a substantially longer survival time and lower parasitemia than control mice after infection, whereas SOD3-overexpressing mice were much more vulnerable to parasite infection. We revealed that SOD3, secreted from activated neutrophils, bound to T cells, suppressed the interleukin-2 expression and concomitant interferon-gamma responses crucial for parasite clearance. Overall, our findings expose active fronts in the arms race between the parasites and host immune system and provide insights into the roles of SOD3 in shaping host innate immune responses to parasite infection. Superoxide dismutase 3 is elevated in patients and animals infected by protozoan parasites such as Plasmodium. Here, Li et al. show that SOD3 expression is associated with experimental cerebral malaria and inhibition of host immune responses. [ABSTRACT FROM AUTHOR]

The study examines the proliferation of small arms and light weapons (SALW) and the susceptible factors responsible for illicit SALW infiltration in Nigeria. The study investigates the implications of illegal acquisition of SALW on Nigeria's security architecture and the institutional efforts to mitigate the influence of illicit SALWs on Nigerian soil. The study adopts descriptive survey research for rigorous analysis of the implication of the illegal proliferation of SALW on Nigeria's security architecture. The study found several measures have been rolled out to salvage the country from the imbroglio. Still, the efforts yielded little results because they cut the problem from the edge instead of uprooting it. Finally, collective security theory was used to analyse the subject matter; providing economic and cultural security was suggested to tackle the precarious country's insecurity challenges orchestrated by the proliferation of SALWs. [ABSTRACT FROM AUTHOR]

This article examines the interactions between deep-sea cephalopods and toothed whales, focusing on the strategies cephalopods use to avoid predation and the echolocation abilities of toothed whales. The authors propose four hypotheses to further investigate these interactions and emphasize the need for direct observation to better understand the dynamics of deep-sea predator-prey systems. The article provides valuable insights into the unique selective pressures and adaptations in the deep-sea environment and calls for further research in this area. [Extracted from the article]

National power has been an important discriminative signal for the evolution of great power competition and international patterns in recent years, not only in terms of the relative resource scale of the state but also in terms of the efficiency of resource use. Based on the two levels of national resources and conversion mechanisms, this article uses the entropy method to establish national power comprehensive assessment index systems covering 144 countries and 38 indicators from 1990–2020. At the same time, based on power transition theory (PTT), this article uses quadratic assignment procedures to verify the relevance and interpretation of international bilateral relations in the national power gap. The conclusion is that technology and economic elements are especially important for national power, and the conversion mechanism is icing on the cake rather than a decisive factor. The competition among great powers is transformed into nontraditional competition rather than an arms race; the international pattern has gradually developed from one superpower to a multipolar trend, and the global economic and geopolitical center has transitioned to Asia. The rise of China and the recession in the U.S. are factual; as the gap between the two countries' power narrows, their international relations become increasingly tense, confirming power transition theory. [ABSTRACT FROM AUTHOR]

Snakes in the family Elapidae largely produce venoms rich in three-finger toxins (3FTx) that bind to the α 1 subunit of nicotinic acetylcholine receptors (nAChRs), impeding ion channel activity. These neurotoxins immobilize the prey by disrupting muscle contraction. Coral snakes of the genus Micrurus are specialist predators who produce many 3FTx, making them an interesting system for examining the coevolution of these toxins and their targets in prey animals. We used a bio-layer interferometry technique to measure the binding interaction between 15 Micrurus venoms and 12 taxon-specific mimotopes designed to resemble the orthosteric binding region of the muscular nAChR subunit. We found that Micrurus venoms vary greatly in their potency on this assay and that this variation follows phylogenetic patterns rather than previously reported patterns of venom composition. The long-tailed Micrurus tend to have greater binding to nAChR orthosteric sites than their short-tailed relatives and we conclude this is the likely ancestral state. The repeated loss of this activity may be due to the evolution of 3FTx that bind to other regions of the nAChR. We also observed variations in the potency of the venoms depending on the taxon of the target mimotope. Rather than a pattern of prey-specificity, we found that mimotopes modeled after snake nAChRs are less susceptible to Micrurus venoms and that this resistance is partly due to a characteristic tryptophan → serine mutation within the orthosteric site in all snake mimotopes. This resistance may be part of a Red Queen arms race between coral snakes and their prey. [ABSTRACT FROM AUTHOR]

While network attacks play a critical role in many advanced persistent threat (APT) campaigns, an arms race exists between the network defenders and the adversary: to make APT campaigns stealthy, the adversary is strongly motivated to evade the detection system. However, new studies have shown that neural network is likely a game-changer in the arms race: neural network could be applied to achieve accurate, signature-free, and low-false-alarm-rate detection. In this work, we investigate whether the adversary could fight back during the next phase of the arms race. In particular, noticing that none of the existing adversarial example generation methods could generate malicious packets (and sessions) that can simultaneously compromise the target machine and evade the neural network detection model, we propose a novel attack method to achieve this goal. We have designed and implemented the new attack. We have also used Address Resolution Protocol (ARP) Poisoning and Domain Name System (DNS) Cache Poisoning as the case study to demonstrate the effectiveness of the proposed attack. [ABSTRACT FROM AUTHOR]

Since the 1980s, most reforms in major arms-producing countries focus on keeping costs under control by either promoting competition between suppliers or by reducing information asymmetry through audits and controls. Indeed, cost escalation represents a challenge but, in fact, these reforms try to adjust the functioning of defence market rather than questioning the institutional features of this latter. The success of defence acquisition structures also explains their limits. The current organisation of defence market was perfectly adapted to the geostrategic context of Cold War and a technological momentum that favours symmetrical arms race between the United States and the Soviet Union. Even if these structures still help deliver advanced capabilities, they can be considered as not sufficient to cover all the operational needs of armed forces. The conception of capabilities needs to go beyond a long-term planning while industrial approaches open the way to more agile development and manufacturing. An alternative defence industrial policy is necessary to complement the existing one. More modular architectures for complex systems provide the opportunity to increase the reactiveness of capability deliveries and to foster both innovation and competition. [ABSTRACT FROM AUTHOR]

Obligate brood parasitism is a peculiar behaviour found in some bird species. The costs for their hosts can be high, generating selection for active defence strategies including foreign egg and chick rejection. Only one of these two rejection strategies seems to be expressed in any given host species, which in turn selects for mimicry in parasites only at one stage of the nesting cycle. Here, I review the cues used by hosts to recognise brood parasites in the nest and the behaviours to neutralise them, as well as counteradaptations found in parasites. Furthermore, I link these adaptations with theoretical and known processes of genetic transmission of the involved mimicry traits to the offspring. I suggest that the stage at which the parasite is recognised by the host can impose selection on the mating system of the parasite and increase the likelihood of speciation. When hosts discriminate against foreign eggs, interbreeding by male and female parasites reared by different hosts may impede speciation, but not the evolution of egg mimicry if inherited through the maternal line (via the W‐chromosome). When hosts discriminate against chicks, an effective mimetic phenotype requires autosomal (or Z‐chromosome) inheritance to allow expression in both male and female chicks, thus favouring assortative mating in the parasites, and potentially leading to speciation. To my knowledge, this review is the first to link host defence strategies with their potential consequences for speciation in brood parasites. I suggest future steps to fill knowledge gaps in brood parasitism.

Key message: Plant‐virus‐host interaction is a complex process involving several players. A constant arms race between the hosts and viruses has led to their co‐evolution. Reactive oxygen species (ROS) are important signaling molecules that regulate plant growth, development, and stress responses. Barley yellow dwarf virus (BYDV) has a wide host range and infects several plant species such as barley, rice, oats, wheat, etc. A recent study by Tian et al. (2024) has highlighted that the movement protein (MP) of BYDV is involved in manipulation of the host ROS pathway to promote viral multiplication as well as transmission. The findings display the multifaceted role of a viral protein that is otherwise involved in movement. The limited coding ability of viruses is compensated by their proteins having multiple roles in the modulation of several different host molecular pathways. This is one of the key reasons for viruses being successful pathogens despite their limited coding ability. [ABSTRACT FROM AUTHOR]

Would it be possible to monitor new missile arms limits in Europe in an environment of deep mistrust? We argue that so-called "active tags," attached to dual-capable missiles, could help states to monitor remotely defined geographical arms limits without having to rely on resource-intensive human inspections. Such a novel approach could build on already existing technologies. We clarify what technologies are available, which options states could choose from for setting up a remote monitoring scheme, and what the technical and political implications are. Verifying geographical arms limits through remote monitoring could not only help to avert a new arms race with Russia; the approach could also be applicable to other conflict regions and different weapon types. [ABSTRACT FROM AUTHOR]