Metabolic shift toward ketosis in asocial cavefish increases social-like affinity.

BACKGROUND: Social affinity and collective behavior are nearly ubiquitous in the animal kingdom, but many lineages feature evolutionarily asocial species. These solitary species may have evolved to conserve energy in food-sparse environments. However, the mechanism by which metabolic shifts regulate social affinity is not well investigated. RESULTS: In this study, we used the Mexican tetra (Astyanax mexicanus), which features riverine sighted surface (surface fish) and cave-dwelling populations (cavefish), to address the impact of metabolic shifts on asociality and other cave-associated behaviors in cavefish, including repetitive turning, sleeplessness, swimming longer distances, and enhanced foraging behavior. After 1 month of ketosis-inducing ketogenic diet feeding, asocial cavefish exhibited significantly higher social affinity, whereas social affinity regressed in cavefish fed the standard diet. The ketogenic diet also reduced repetitive turning and swimming in cavefish. No major behavioral shifts were found regarding sleeplessness and foraging behavior, suggesting that other evolved behaviors are not largely regulated by ketosis. We further examined the effects of the ketogenic diet via supplementation with exogenous ketone bodies, revealing that ketone bodies are pivotal molecules positively associated with social affinity. CONCLUSIONS: Our study indicated that fish that evolved to be asocial remain capable of exhibiting social affinity under ketosis, possibly linking the seasonal food availability and sociality.

Simultaneous Hydrogen Bonds with Different Binding Modes: The Acceptor "Rules" but the Donor "Chooses".

Invited for the cover of this issue is the group of Cristina Trujillo at Trinity College Dublin and the University of Manchester. The image depicts a market run by hydrogen bond acceptors in which hydrogen-bond-donor "customers" are choosing their preferred binding mode "vegetable". Read the full text of the article at 10.1002/chem.202203577.

Simultaneous Hydrogen Bonds with Different Binding Modes: The Acceptor "Rules" but the Donor "Chooses".

This computational work studies the different hydrogen bond (HB) binding modes that can be established between neighbouring HB donors and acceptors in structures with relevance in catalysis and biology. To analyse the electronic effect on the σ-hole, unsubstituted HB donors and ones with two different substituents, an electron withdrawing (EWG), and an electron donating (EDG) group, were studied. Upon complexation, three different binding modes were observed: bifurcated, parallel, and zigzag. It was found that, as a general trend, HBs within a parallel pattern are the strongest followed by those within bifurcated and zigzag binding modes, leading to a "competition" between the last two. Similar patterns and trends have been found in experimental structures found in a search within the CSD. In conclusion, even though the HB acceptors "rule" the pattern and strength of the HB interactions within the dimers, when there is an option for different binding modes within a particular dimer, the HB donors "choose" the type of binding established.

COVID-19 Containment Ship Model: A Case Study for Pacific Island Response.

The Republic of the Marshall Islands, American Samoa, the Federated States of Micronesia, and the Republic of Palau have been without any COVID-19 community transmission since the beginning of the global pandemic. The Commonwealth of the Northern Mariana Islands has experienced modest community transmission, and Guam has had significant COVID-19 community transmission and morbidity. Although several of these United States Affiliated Pacific Island jurisdictions made difficult strategic choices to prevent the spread of COVID-19 which have been largely successful, the built environment and the population density in the urban areas of the Pacific remain inherently conducive to rapid COVID-19 transmission. Rapid transmission could result in devastating health and economic consequences in the absence of continued vigilance and long-term strategic measures. The unique COVID-19 vulnerability of islands in the Pacific can be modeled through examination of recent outbreaks onboard several United States Naval ships and other marine vessels. The environmental characteristics that pose challenges to infection control on an isolated naval ship are analogous to the environmental characteristics of these Pacific island communities. Considering a collection of case studies of COVID-19 transmission on ships and applying to Pacific Island environments, provides a heuristic, easily accessible epidemiologic framework to identify methods for interventions that are practical and reliable towards COVID-19 containment, prevention, and control. Using accessible evidence based public health policies, infection risk can be decreased with the objective of maintaining in-country health and social stability. These case studies have also been examined for their relevance to current discussions of health care infrastructure and policy in the Pacific Islands, especially that of vaccination and repatriation of citizens marooned in other countries. The need for aggressive preparation on the parts of territories and nations not yet heavily exposed to the virus is critical to avoid a rapid "burn-through" of disease across the islands, which would likely result in catastrophic consequences.

First case of human latrodectism in Venezuela.

The first case of envenoming by Latrodectus geometricus in Venezuela is described. The accident occurred at the victims home, in Aragua de Barcelona, Anzoátegui State. The 31-year-old female victim was bitten twice on the left scapular region, in quick succession (within seconds). She developed a hyperactive state of the central, autonomic and peripheral nervous systems with minor local symptoms.

First case of human latrodectism in Venezuela / Primeiro caso de latrodectismo humano na Venezuela

The first case of envenoming by Latrodectus geometricus in Venezuela is described. The accident occurred at the victim’s home, in Aragua de Barcelona, Anzoátegui State. The 31-year-old female victim was bitten twice on the left scapular region, in quick succession (within seconds). She developed a hyperactive state of the central, autonomic and peripheral nervous systems with minor local symptoms.

Descreve-se o primeiro caso de envenenamento por Latrodectus geometricus na Venezuela. O acidente ocorreu na residência, em Aragua de Barcelona, Estado Anzoátegui. A paciente de 31 anos de idade foi picada, consecutivamente duas vezes, em segundos, na região escapular esquerda. Ela desenvolveu um quadro de hiperatividade do sistema nervoso central, autonômico e periférico com escassa sintomatologia local.

Outbreak of Shiga toxin-producing Escherichia coli O111:H8 infections among attendees of a high school cheerleading camp.

Few US clinical laboratories screen stool specimens for Shiga toxin-producing Escherichia coli (STEC) other than E. coli O157. An outbreak of STEC O111:H8 infections indistinguishable from E. coli O157:H7 at a youth camp highlights the need to improve non-O157 STEC surveillance. Interviews of 521 (80%) of 650 attendees revealed 55 (11%) were ill; 2 developed hemolytic-uremic syndrome. Illness was associated with consuming salad during the camp's first lunch meal (hazard ratio [HR], 4.68; P<.01), consuming ice provided in barrels on the camp's final day (HR, 3.41; P<.01), eating cob corn (HR, 3.22; P<.01), and eating a dinner roll (HR, 2.82; P<.01). Cultures of 2 of 11 stools yielded E. coli O111:H8. Results of serologic testing and additional stool cultures demonstrated no evidence of infection with other bacterial pathogens, including E. coli O157, and supported infection with E. coli O111. Clinical laboratories should routinely screen suspect specimens for non-O157 STEC and should serotype and report Shiga-positive isolates.