Quality of life one year after bariatric surgery: the moderator role of spirituality

Background: This study aimed to assess quality of life in obese patients 1 year after bariatric surgery taking into consideration the influence of socio-demographic, clinical, and psychological variables. Methods: A sample of 90 patients undergoing bariatric surgery was assessed in two moments: before surgery and 1 year after surgery. Results: Social support, problem-focused coping strategies, and quality of life increased after surgery, while eating disorder behaviour and impulsiveness decreased. The presence of eating disorder behaviour predicted worse physical and mental quality of life and higher satisfaction with social support predicted better physical and mental quality of life. In addition, higher impulsiveness predicted worse mental quality of life. Spirituality moderated the relationship between impulsiveness and mental/physical quality of life. Conclusions: Interventions should focus on promoting social support and coping strategies particularly spirituality since it played an important role in quality of life

Rapid Experimental Evolution of Pesticide Resistance in C. elegans Entails No Costs and Affects the Mating System

Pesticide resistance is a major concern in natural populations and a model trait to study adaptation. Despite the importance of this trait, the dynamics of its evolution and of its ecological consequences remain largely unstudied. To fill this gap, we performed experimental evolution with replicated populations of Caenorhabditis elegans exposed to the pesticide Levamisole during 20 generations. Exposure to Levamisole resulted in decreased survival, fecundity and male frequency, which declined from 30% to zero. This was not due to differential susceptibility of males. Rather, the drug affected mobility, resulting in fewer encounters, probably leading to reduced outcrossing rates. Adaptation, i.e., increased survival and fecundity, occurred within 10 and 20 generations, respectively. Male frequency also increased by generation 20. Adaptation costs were undetected in the ancestral environment and in presence of Ivermectin, another widely-used pesticide with an opposite physiological effect. Our results demonstrate that pesticide resistance can evolve at an extremely rapid pace. Furthermore, we unravel the effects of behaviour on life-history traits and test the environmental dependence of adaptation costs. This study establishes experimental evolution as a powerful tool to tackle pesticide resistance, and paves the way to further investigations manipulating environmental and/or genetic factors underlying adaptation to pesticides

Sequential injection determination of nitrate in vegetables by spectrophotometry with inline cadmium reduction

A sequential injection system for the determination of nitrate (NO3 2) in vegetables was developed to automate this determination, allowing for substantially reduced reagent consumption and generated waste using low-cost equipment. After extraction with water and filtration, the extracted nitrate is reduced inline to nitrite in a copperized cadmium (Cd) column and determined as nitrite. According to the Griess–Ilosvay reaction, nitrate is diazotized with sulfanilamide and coupled with N-(1-naphtyl)-ethylenediamine dihydrochloride to form a purple-red azo dye monitored at 538 nm. Nitrate can be determined within a range of 1.35–50.0 mg L21 of NO3 2 (corresponding to 0.270–10.0 g of NO3 2 per kg of vegetable), with a conversion rate of nitrate to nitrite of 99.1+0.8%. The results obtained for 15 vegetable extracts compare well with those provided by the classical procedure, with a sampling throughput of 24 determinations per hour and relative standard deviations better than 1.2%

Colonization patterns of Nosema ceranae in the Azores archipelago

Nosema ceranae and Nosema apis are pathogens of honey bees that cause nosemosis, a disease implicated in colony losses worldwide. They are obligate intracellular pathogens infecting the midgut epithelial cells of adult honey bees. Although N. ceranae was originally a pathogen specific of Apis cerana, currently, it is found in Apis mellifera throughout most of the world. Due to their confined environments, which limited pathogen transmission and dissemination, islands are unique places for epidemiological studies. There are only a few Varroa destructor-free and possibly even fewer N. ceranae-free honey bee sanctuaries in the world, with the Azores being one. Even though with the exception of Santa Maria and Flores, nosemosis has been present in the Azores since 2008, the causal species has yet to be identified. Hence, this study aimed to determine the prevalence and infection levels of Nosema spp. in the Azorean honey bees. In 2014/2015, 474 colonies were sampled on Faial, Flores, Pico, Graciosa, São Jorge, São Miguel, Santa Maria, and Terceira. Additionally, São Jorge, Santa Maria, Faial, and Terceira were re-sampled in 2020 with a total of 91 colonies. DNA was extracted, and the diagnosis and Nosema spp. loads were obtained by multiplex PCR and RT-qPCR. The findings indicate that N. ceranae appears to be the dominant species in the Azores. N. apis was only detected in 2014/2015 with a very low prevalence (5.1%). N. ceranae prevalence varied between 2.7%, on São Jorge, and 50.7%, on Pico. In 2020, N. ceranae positive colonies increased significantly on Terceira (57.1%) and São Jorge (50.0%). N. ceranae was not detected on Santa Maria in both periods. Average infection levels in positive N. ceranae colonies were usually medium to high (>10-7 ng/μl), with São Jorge colonies displaying the greatest infection intensity (>10-5 ng/ μl). This study highlights the Azores archipelago as a unique place for beekeeping, with islands free of N. ceranae and V. destructor, which are two important stressors that afflict honey bees in the world.Financial support was provided by Portuguese funds through FCT (Fundação para a Ciência e a Tecnologia) in the framework of the project BeeHappy (POCI-01-0145-FEDER-029871). ARL was supported by a PhD scholarship (SFRH/BD/143627/2019) from the FCT. FCT provided financial support by national funds (FCT/MCTES) to CIMO (UIDB/00690/2020).info:eu-repo/semantics/publishedVersio

Radiolabeled albumin through S_NAr of cysteines as a potential pretargeting theranostic agent

Human serum albumin (HSA) has been shown to be a promising tumor targeting vector and target for generating theranostics by bioconjugation. Unstable chemical conjugation to HSA via a cysteine (Cys34) by reversible Michael additions is most commonly applied for this purpose. Herein, we describe utilization of our recently developed site-selective irreversible S(N)Ar conjugation to Cys34 using perfluorobenzene sulfonyl derivatives to introduce a trans-cyclooctene (TCO) handle. The TCO could then be bioorthogonally ligated within minutes through an inverse-electron demand Diels–Alder reaction (IEDDA) to tetrazines (Tzs) containing a radionuclide. The methodology opens up a wide range of chemistries including pretargeting, ‘click-to-release’ tumor selective drug delivery or ultra-fast and complete conjugation of any drug. The proof-of-principle study demonstrated that the conjugation chemistry is feasible, robust and easy to carry out, being promising for pretargeted imaging and therapy studies as well as selective drug delivery using HSA

Release of IL-1β via IL-1β-Converting Enzyme in a Skin Dendritic Cell Line Exposed to 2,4-Dinitrofluorobenzene

We used a mouse fetal skin dendritic cell line (FSDC) to study the effect of the strong allergen 2,4-dinitrofluorobenzene (DNFB) on interleukin (IL)-1β release and IL-1β receptor immunoreactivity. Stimulation with DNFB (30 minutes) increased IL-1β release without changing the mRNA levels of the protein. Furthermore, DNFB increased transiently the interleukin-1β-converting enzyme (ICE) activity, as measured with its fluorogenic substrate Z-Tyr-Val-Ala-Asp-AFC. The ICE inhibitor Z-YVAD-FMK prevented the release of IL-1β evoked by DNFB. Incubation of the cells with DNFB (30 minutes) strongly increased IL-1β receptor immunoreactivity. The rapid effect of DNFB on the release of mature IL-1β, without inducing an increase of IL-1β mRNA in FSDC, suggests a posttranslational modification of pro-IL-1β by ICE activity

Bubbles moving in blood flow in a microchannel network: the effect on the local hematocrit

Air inside of blood vessels is a phenomenon known as gas embolism. During the past years, studies have been performed to assess the influence of air bubbles in microcirculation. In this study, we investigated the flow of bubbles in a microchannel network with several bifurcations, mimicking part of a capillary system. Thus, two working fluids were used, composed by sheep red blood cells (RBCs) suspended in a Dextran 40 solution with different hematocrits (5% and 10%). The experiments were carried out in a polydimethylsiloxane (PDMS) microchannel network fabricated by a soft lithography. A high-speed video microscopy system was used to obtain the results for a blood flow rate of 10 µL/min. This system enables the visualization of bubble formation and flow along the network. The results showed that the passage of air bubbles strongly influences the cell’s local concentration, since a higher concentration of cells was observed upstream of the bubble, whereas a lower local hematocrit was visualized at the region downstream of the bubble. In bifurcations, bubbles may split asymmetrically, leading to an uneven distribution of RBCs between the outflow branches.This research was funded by Portuguese national funds of FCT/MCTES (PIDDAC) through the base funding from the following research units: UIDB/00532/2020 (Transport Phenomena Research Center—CEFT). UIDB/04077/2020 (Research Center (Mechanical Engineering and Resource Sustainability Center—MEtRICs). The authors are also grateful for the partial funding of FCT through the projects PTDC/SAU-ENB/116929/2010, POCI-01-0145-FEDER-016861 (ref: PTDC/QEQ-FTT/4287/2014), NORTE-01-0145-FEDER-029394 and NORTE-01-0145-FEDER-030171 funded by COMPETE2020, NORTE2020. PORTUGAL2020 and FEDER. D. Bento acknowledges the PhD scholarship SFRH/BD/91192/2012 granted by FCT