Search

All 32 Brazilian species of Parodia Speg (Cactaceae) occurring in Rio Grande do Sul State are considered threatened, according to the IUCN criteria. Until 2021, Parodia rechensis (CR) was known by only two small populations. However, a new population with over 400 individuals was discovered in 2021, prompting the study of its reproductive biology as a way to promote its conservation. Anthesis, breeding system, and natural pollination were studied in the field. The breeding system was studied by applying controlled pollination treatments to plants excluded from pollinators (bagged). Germination features were studied at the Seed Bank of the Porto Alegre Botanical Garden under controlled temperatures (20, 25, and 30 °C). The anthesis is diurnal and lasts for up to four days. The flowers offer pollen as the sole resource to the pollinators. The study species is unable to set fruit and seed without the agency of pollinators and has self-incompatible (unable to set fruit and seeds when pollinated with pollen of the same individual) characteristics that can considerably restrict its reproduction. Native bees of Halictidae and Apidae (Hymenoptera) are the main pollinators, with a smaller contribution of Melyridae (Coleoptera) and Syrphidae (Diptera). Natural fruit set is moderate (≤64%, per individual), but the species presents vegetative growth, producing several branches from the mother plant. Seeds showed the optimum germination rate at 20 °C and an inhibition of 75% in germinability at 30 °C. Our findings suggest the need to manage the species' habitat to guarantee the permanency of the plants and healthy populations of pollinators as well. Our findings raise concerns about the germination and establishment of new individuals in the context of rising temperatures caused by climate change. Suggestions for the possible management of the extant populations are made. [ABSTRACT FROM AUTHOR]

Introduction: This study aimed to compare the effectiveness of two methods for non-invasive mechanical ventilation in patients with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) – using a helmet interface with a flow meter and positive end-expiratory pressure valve versus a traditional mechanical ventilator. Material and methods: We conducted a single-center randomized clinical trial involving 100 adult SARS-CoV-2 patients in a specialized private hospital. Participants were randomly assigned to two groups: one using the helmet interface with a flow meter and positive end-expiratory pressure valve and the other employing conventional mechanical ventilation. Our study included participant selection, blood gas analysis, assessment of respiratory rate, peripheral oxygen saturation, modified Borg scale scores, and a visual analog scale. Results: The study showed no significant difference in intubation rates between the mechanical ventilation (54.3%) and helmet interface with flow meter and positive end-expiratory pressure valve (46.8%) groups (p = 0.37). Additionally, the helmet group had a shorter average duration of use (3.4 ±1.6 days) compared to the mechanical ventilation group (4.0 ±1.9 days). The helmet group also had a shorter average hospitalization duration (15.9 ±7.9 days) compared to the mechanical ventilation group (17.1 ±9.5 days). Conclusions: This single-center randomized clinical trial found no statistically significant differences between the two methods of non-invasive ventilation. Implications for clinical practice: using the helmet interface with the flow meter and positive end-expiratory pressure valve can simplify device installation, potentially reducing the need for intubation, making it a valuable tool for nurses and physiotherapists in daily clinical practice. [ABSTRACT FROM AUTHOR]

The search for greater productivity due to the growing demand for food can lead to arduous work, with exhausting and inadequate conditions. Thus, the aim of the study was to carry out a postural evaluation in five different activities in an agroindustrial company, as well as to measure the environmental and organizational conditions of the site. The postural analysis was performed through images of the postures used in the work environment and the required forces, using the RULA method and Ergolandia 6.0 software, associated to a questionnaire evaluating the biomechanical conditions of the work station, applied to the employees. For the environmental factors, the noise analysis (NBR 10152 and NR 17), temperature (NR 17) and illumination (NBR ISSO / CIE 8995-1) were performed. Among the five activities analyzed, two presented a need for immediate postural intervention and modifications in the work environment. Also, when analyzing the biomechanical conditions of the environment, only two workstations presented good condition. Regarding the environmental factors, only one of the workstations was in accordance with the noise standard and all were inadequate for temperature and lightness checks. [ABSTRACT FROM AUTHOR]

Copyright of Tecno-Lógica is the property of Tecno-Logica 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 objective of this study was to evaluate the operating performance of crop residue cutting discs with distinct cutting edges in the no-tillage system, in relation to the travel speed of the tractor/tool holder set. The experiment was carried out in an experimental area, the soil classified as Paleudalf. The experiment consisted in a factorial arrangement of 4×4, totaling 16 combinations of treatments and three replications, composed by the interaction of the factors: crop residue cutting discs (plain flat disc, wavy disc, rippled disc, and helical wavy disc coulter) and travel speed (1.11, 1.67, 2.22 and 2.78 m s-1). It was used a mobile tool holder structure for the coupling of the active organs, which was pulled by a farm tractor. For the collection of data on traction force and hourly fuel consumption, it was used electronic instrumentation; as for the measurement of the soil mobilization variables, it was used a microprofilometer. The cutting disc factor showed significant influence on all the variables. The travel speed factor only did not provide significant difference for mobilized soil area. The average requirement of traction demand for the wavy disc, rippled disc, helical wavy disc coulter and plain flat disc was 1.35, 1.27, 1.25 and 1.15 kN, respectively, being increased with the increase in speed. The use of discs with edges that provide larger contact area with the soil, in addition to increasing the traction force demand, makes the process more sensitive to sudden increases in speed, possibly caused by soil impositions. The wavy cutting disc showed the highest hourly fuel consumption. As for the mobilized soil area, it was proven the greater mobilization 42.84 cm2 for the wavy disc and the lowest 20.62 cm2 for the plain flat disc. For all the variables in the study, the highest values were obtained when using the wavy cutting disc and the lowest values when the plain flat disc was used. [ABSTRACT FROM AUTHOR]

Copyright of Tecno-Lógica is the property of Tecno-Logica 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 Tecno-Lógica is the property of Tecno-Logica 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.)

Introduction: the adhesive dentistry had its beginning in the enamel etching. With the rapid development of new products, in vitro tests have become valuable to compare the UK adhesives to enamel, dentin and other substrates - in immediate or long-term analyzes to evaluate the bond durability. Objective: to evaluate the shear bond strength (SBS) of all-in-one adhesives on different substrates after a week storage in distilled water. Methodology: seventy five bovine incisors were used and obtained 25 samples of uncut enamel/UE; 25 of cut enamel/CE; 25 of dentin/DE; more 25 of Filtek Z350XT/ XT. Five adhesives were applied, and divided into 5 groups (n=5): [1]37% phosphoric acid + Single Bond 2/SB adhesive control; [2] BeautiBond/BB; [3]Bond Force/BF; [4]One SE/SE; [5]Single Bond Universal/UN. Four Tygon tubings were positioned on the substrates and filled in with Filtek Z350 XT Flow. After 20s VLC, the tubes were removed to expose 4 specimens for each sample (20 cylinders per group). After a week in distilled water 37°C, the specimens were tested in an universal testing machine. The tensile load resulting in shear was performed on the basis of the cylinder at a speed of 0.5 mm/min. The results were expressed in MPa and analyzed by Anova (p<0,001) and Tukey test (p<0.05). Results: comparing each substrate, there was no difference for the UE and the CE. To dentin, the SE and the UN resulted in higher SBS. For the composite substrate, the higher SBS was observed in UN. Comparing the substrates, the SBS was lower to some adhesives in UE and DE. Conclusion: the all-in-one adhesives are substrate-dependents. The highest SBS was obtained for the UN in the composite substrate, and lowest SBS mean to BF in dentin substrate. The SBS in CE and XT was more stable, when compared to other substrates. [ABSTRACT FROM AUTHOR]

The Caatinga is an exclusively Brazilian biome, and is the largest and most biodiverse Seasonal Tropical Dry Forest in the world. Despite that, the mammalian fauna, especially small mammals, is the least studied of all Brazilian biomes. In order to fill gaps and provide detailed information on small mammals (Didelphimorphia, Rodentia) in the Caatinga biome, we compiled reliable records focusing on richness, composition and some biometric data. These records came from mammal collections, papers, theses, books, and unpublished data, prioritizing records with vouchers housed in scientific collections. We compiled a total of 3133 records from 816 locations, resulting in a richness of 47 native species (12 marsupials and 35 rodents, plus three exotic rodents, Rattus rattus, Rattus norvegicus, and Mus musculus). This dataset includes records of three new species for the biome and its transition zone: the rodents Calomys mattevii, Holochilus oxe, and Nectomys squamipes. Of the total number of records, 1808 (57.71%) are from consulting activities, 95 (3.03%) are from zoonoses studies and 104 (3.32%) are from the National Plague Service (SNP). All nine Brazilian states with territory in the Caatinga have sampling data for small mammals, but the number of records and localities are unevenly distributed, with the state of Rio Grande do Norte having the lowest number of records and locations sampled. Our dataset is the first of its kind for the Caatinga biome and has considerable potential value for studies of habitat use, landscape ecology, macroecology, biogeography, and conservation. There are no copyright restrictions on the data. Please cite this data paper when the data are used in publications. We also request that researchers and teachers inform us of how they are using the data., (© 2022 The Ecological Society of America.)

Objective: The present study was designed to answer several concerns disclosed by systematic reviews indicating no evidence to support the use of computed tomography angiography (CTA) in the diagnosis of brain death (BD). Therefore, the aim of this study was to assess the effectiveness of CTA for the diagnosis of BD and to define the optimal tomographic criteria of intracranial circulatory arrest., Methods: A unicenter, prospective, observational case-control study was undertaken. Comatose patients (Glasgow Coma Scale score ≤ 5), even those presenting with the first signs of BD, were included. CTA scanning of arterial and venous vasculature and transcranial Doppler (TCD) were performed. A neurological determination of BD and consequently determination of case (BD group) or control (no-BD group) was conducted. All personnel involved with assessing patients were blinded to further tests results. Accuracy of BD diagnosis determined by using CTA was calculated based on the criteria of bilateral absence of visualization of the internal cerebral veins and the distal middle cerebral arteries, the 4-point score (4PS), and an exclusive criterion of absence of deep brain venous drainage as indicated by the absence of deep venous opacification on CTA, the venous score (VS), which considers only the internal cerebral veins bilaterally., Results: A total of 106 patients were enrolled in this study; 52 patients did not have BD, and none of these patients had circulatory arrest observed by CTA or TCD (100% specificity). Of the 54 patients with a clinical diagnosis of BD, 33 met the 4PS (61.1% sensitivity), whereas 47 met the VS (87% sensitivity). The accuracy of CTA was time related, with greater accuracy when scanning was performed less than 12 hours prior to the neurological assessment, reaching 95.5% sensitivity with the VS., Conclusions: CTA can reliably support a diagnosis of BD. The criterion of the absence of deep venous opacification, which can be assessed by use of the VS criteria investigated in this study, can confirm the occurrence of cerebral circulatory arrest.Clinical trial registration no.: 12500913400000068 (clinicaltrials.gov).