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The fundamental biology of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleocapsid protein (Ncap), its use in diagnostic assays and its potential application as a vaccine component have received considerable attention since the outbreak of the Covid19 pandemic in late 2019. Here we report the scalable expression and purification of soluble, immunologically active, SARS-CoV-2 Ncap in Escherichia coli. Codon-optimised synthetic genes encoding the original Ncap sequence and four common variants with an N-terminal 6His affinity tag (sequence MHHHHHHG) were cloned into an inducible expression vector carrying a regulated bacteriophage T5 synthetic promoter controlled by lac operator binding sites. The constructs were used to express Ncap proteins and protocols developed which allow efficient production of purified Ncap with yields of over 200 mg per litre of culture media. These proteins were deployed in ELISA assays to allow comparison of their responses to human sera. Our results suggest that there was no detectable difference between the 6His-tagged and untagged original Ncap proteins but there may be a slight loss of sensitivity of sera to other Ncap isolates., (© 2024 The Author(s).)

Oxygenase and peroxygenase enzymes generate intermediates at their active sites which bring about the controlled functionalization of inert C-H bonds in substrates, such as in the enzymatic conversion of methane to methanol. To be viable catalysts, however, these enzymes must also prevent oxidative damage to essential active site residues, which can occur during both coupled and uncoupled turnover. Herein, we use a combination of stopped-flow spectroscopy, targeted mutagenesis, TD-DFT calculations, high-energy resolution fluorescence detection X-ray absorption spectroscopy, and electron paramagnetic resonance spectroscopy to study two transient intermediates that together form a protective pathway built into the active sites of copper-dependent lytic polysaccharide monooxygenases (LPMOs). First, a transient high-valent species is generated at the copper histidine brace active site following treatment of the LPMO with either hydrogen peroxide or peroxyacids in the absence of substrate. This intermediate, which we propose to be a Cu II -(histidyl radical), then reacts with a nearby tyrosine residue in an intersystem-crossing reaction to give a ferromagnetically coupled ( S = 1) Cu II -tyrosyl radical pair, thereby restoring the histidine brace active site to its resting state and allowing it to re-enter the catalytic cycle through reduction. This process gives the enzyme the capacity to minimize damage to the active site histidine residues "on the fly" to increase the total turnover number prior to enzyme deactivation, highlighting how oxidative enzymes are evolved to protect themselves from deleterious side reactions during uncoupled turnover.

To examine the culturally embedded nature of religious practices, we conducted a mixed-methods study in which Muslim American adolescents described how and why their religious practices had changed in recent years (see Etengoff & Daiute, 2013, J. Adolesc. Res., 28, 690). Participants included 201 Muslim adolescents (ages 13-19) from predominantly immigrant families; all were contestants in a Muslim Inter-Scholastic Tournament regional competition. Participants completed surveys including an item regarding whether their religious practices had changed, and for those who answered affirmatively, open-ended questions about the change. Additional measures assessed ethnic identity and perceived discrimination. As hypothesized, the 60% of participants who reported a change in religious practices described this shift as a response to new contexts, people, and religious knowledge. Those who reported a change also reported higher levels of ethnic identity exploration and perceived discrimination. Overall, Muslim American adolescents' descriptions portrayed religious practices as developing through reciprocal interactions with culture. More generally, participants' descriptions point to the viability of a model in which religious practices change and in turn are changed by cultural contexts. Statement of contribution What is already known on this subject? Religious development is viewed as taking place in relational systems with reciprocity between individuals and surrounding contexts. Variations in contexts predict variations in religious development, but mechanisms of development are not well understood. Muslim Americans, including adolescents, show high levels of religious involvement and experience unique cultural and religious contexts. Muslim American emerging adults describe their religious practices as responsive to sociocultural contexts. What does the study add? This study focuses on Muslim American adolescents, a group that has received little research attention, especially in regard to religious development. Participants reported a wide array of changes in religious practices, and they described these changes as responses to social and cultural influences. Participants' descriptions of changing practices can be understood through a Vygotskian framework in which religious practices are cultural tools that both respond to and shape surrounding cultural contexts., (© 2017 The British Psychological Society.)

Distinguishing between fantasy and reality is an important developmental milestone, achieved in the preschool years, that has been linked to children's cognitive capabilities and emotional knowledge. The authors examined the influence of both trait and prime fearfulness on preschoolers' ability to differentiate between fantastic and real situations. Forty 3-5-year-old preschoolers were administered a fearfulness assessment, a standard theory-of-mind task, and a fantasy-reality discrimination task (with or without a fear prime). When primed to experience fear, participants who were high in trait fearfulness made more mistakes distinguishing between fantastic and real events than did participants who were low in trait fearfulness. In the absence of a fear prime there was no difference in performance between these two groups. These findings were independent of participants' age, gender, and theory of mind abilities and suggest that preschoolers who are high in trait fearfulness are more prone to difficulty in discriminating between fantasy and reality when actively experiencing fear. This study illuminates important factors that contribute to the errors in fantasy-reality judgments frequently seen in preschoolers.

Objective: To describe the development of an easily accessible online biologic exposure algorithm to guide postexposure medical evaluation and treatment of medical research personnel and health care workers in a Midwest medical center campus., Methods: We describe the steps involved in the creation of a biologic exposure algorithm from design through implementation., Results: One point of contact allows phone evaluation and immediate triage, providing effective and timely medical care for exposed employees as well as important guidance for clinicians. The algorithm and exposure response system achieved the goal of integrating clinical and research laboratory exposure response., Conclusions: Development of an integrated clinical and research exposure protocol may be an efficient way to maximize biosafety for workers.

A cost analysis of combining a tuberculin skin test (TST) and the QuantiFERON-TB Gold test (QFT-GT) to detect latent tuberculosis in newly hired health care workers was performed. An approximately 50% reduction in the cost of additional care was realized when workers with positive TST results were subsequently screened using the QFT-GT.

Two studies examined children's thought patterns in relation to their responses to social challenge. In Study 1, 4th and 5th graders tried out for a pen pal club under either a performance goal (stressing the evaluative nature of the tryout) or a learning goal (emphasizing the potential learning opportunities). In their behavior and attributions following rejection, children who were focused on a performance goal reacted with more helplessness, whereas children given a learning goal displayed a more mastery-oriented response. Study 2 found that in response to hypothetical socially challenging situations, 4th, 5th, and 6th graders who believed personality was nonmalleable (entity theorists) vs. malleable (incremental theorists) were more likely to endorse performance goals. Together, these studies indicate that children's goals in social situations are associated with their responses to social failure and are predicted by their implicit theories about their personality.

Motivational helplessness, linked to conceptions of intelligence, has been well documented in older children. While some researchers have reported that children just starting school are motivationally invulnerable, others have found evidence of helplessness when these children encounter failure. The present study seeks to determine whether the reactions associated with helplessness can be identified in a new context, that of criticism, and whether any such responses are related to the child's conceptions of goodness. Subjects were 107 5- and 6-year-old children who enacted achievement situations in which teacher criticism was presented. The 39% of children whose own assessments were undermined by criticism exhibited the affect, task choices, and nonconstructive problem-solving strategies characteristic of helplessness. They were also more likely to make global negative self-judgments following criticism, including negative judgments of their goodness. Finally, these children were more likely to endorse stable and global beliefs about goodness.