Flávia Lb do Amaral

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This study looked at how the removal of the pineal gland, which causes a lack of melatonin, affects sleep patterns in 17 patients who had treatment for pineal tumors. The researchers found that although the patients experienced some mild sleep issues at night, they still maintained a regular sleep/wake cycle and did not have disorders related to their circadian rhythms. This is important because it shows that other factors besides melatonin can help regulate sleep patterns. Who this helps: This helps patients who have had pineal gland removal and their healthcare providers.

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This study looked at how melatonin, a hormone produced at night, affects specific molecules called microRNAs in the sperm and brain of rats after their pineal gland was removed. The researchers found that without melatonin, the levels of certain microRNAs in sperm increased, and giving melatonin back normalized these levels. This is important because microRNAs can influence embryonic development and could be linked to conditions like autism. Who this helps: This helps researchers and healthcare professionals understand the role of melatonin and microRNAs in reproductive health and developmental issues.

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This study looked at a specific gene related to melatonin and its link to kidney problems in people with type 1 diabetes. Researchers found that those who experienced a decline in kidney function (by at least 5 mL/min per 1.73 m² per year) had a higher occurrence of a specific genetic variant, known as rs4862705, compared to those whose kidney function remained stable. This matters because identifying genetic factors can help better predict and manage kidney decline in individuals with diabetes. Who this helps: Patients with type 1 diabetes and their doctors.

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This research studied how getting outdoor daylight affects people's mood and mental health. It found that people who were exposed to daylight regularly, especially for more than four hours a day or in the morning, reported better well-being and fewer depressive symptoms. Specifically, daily exposure improved well-being scores by about 4 points and reduced depression scores by nearly 4 points compared to those with little exposure. Who this helps: This helps patients, particularly those experiencing mood disorders or depression.

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This research examines how melatonin, a hormone that regulates sleep cycles, interacts with female reproductive hormones during pregnancy and menopause. The study found that melatonin levels vary during these life stages, potentially influencing reproductive hormone secretion and affecting overall health. Understanding this relationship is important because it may lead to better management of symptoms related to pregnancy and menopause. Who this helps: This helps patients going through pregnancy or menopause.

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This study looked at how different polishing methods affect the roughness and color stability of two types of dental materials: bis-acryl composites and chemically activated acrylics. The researchers found that the acrylic materials were smoother and maintained their color better than the bis-acryl materials after being polished. Specifically, the finished acrylic showed less roughness and better color retention, even after being placed in coffee and red wine. Who this helps: This benefits dentists and patients who rely on durable and aesthetically pleasing temporary dental restorations.

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This study examined how adding different amounts of titanium dioxide (TiO) to a hydrogen peroxide-based whitening agent affects the effectiveness of teeth bleaching, both with and without the use of polywave LED light. The researchers found that a 5% concentration of TiO resulted in the best color change of teeth after the second bleaching session, and using the LED light further improved the results. This matters because it suggests a more effective way to achieve whiter teeth in less time. Who this helps: Patients seeking effective teeth whitening solutions.

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This study looked at how a wet-bonding technique using ethanol affects the bonding strength of dental adhesives to dentin, especially when using a universal adhesive system. The researchers found that using ethanol significantly reduced the activity of enzymes that can break down the bond between the tooth and the adhesive. Specifically, they noted that the wet-bonding technique with ethanol led to a lower level of enzyme activity in crucial areas near the bond. This is important because it could lead to longer-lasting dental repairs. Who this helps: This benefits dentists and patients needing dental restorations, by improving the durability of dental adhesives.

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This study looked at how the absence of melatonin affects the growth of facial and dental structures in baby rats. Researchers found that pups born to mothers without melatonin had smaller jaw bones and teeth, with changes in important growth markers. This is important because it suggests that a lack of melatonin during pregnancy might hinder normal facial and tooth development, which could have implications for understanding similar issues in humans. Who this helps: This research may benefit doctors and healthcare providers monitoring fetal development in pregnant women.

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This study looked at how an extract from the Libidibia ferrea plant affects the strength of dental bonds over time and the natural enzyme activity in teeth. They found that using this extract with certain adhesive systems helped maintain strong bonds after 12 months, with the resin-dentin bond staying stable when using the "self-etch" method. Specifically, the self-etch groups had better durability and less enzyme activity compared to those using the traditional technique combined with the extract. Who this helps: This benefits dentists and patients needing long-lasting dental treatments.

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This study examined how different coatings made of tiny particles called nanoparticles affect the friction and surface texture of orthodontic wires used in braces. The researchers found that wires coated with silica dioxide (SiO) had significantly lower friction compared to those coated with titanium dioxide (TiO) and control wires, helping to reduce friction by a notable margin, with p-values less than .001 indicating strong results. This is important because lower friction in braces can lead to more effective treatment and less discomfort for patients. Who this helps: Patients undergoing orthodontic treatment.

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This study looked at whether special desensitizing agents used during professional teeth whitening could reduce tooth sensitivity. It involved 75 patients who were either given bleaching treatments alone or with desensitizing gels or pastes. The results showed that while the desensitizing agents were acceptable to patients, they did not significantly decrease sensitivity, though one group experienced slightly less sensitivity after a certain treatment (24 hours after the second session), with no impact on color change. Who this helps: Patients experiencing tooth sensitivity during whitening procedures.

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This study looked at how different types of connectors (abutments) used with dental implants perform under repeated stress and temperature changes. They tested 40 implants and found that those connected with completely cast abutments had a greater misfit and weaker strength under stress compared to those with overcast abutments. Specifically, completely cast abutments showed a misfit that was four times worse when thermomechanical cycling was applied. Who this helps: This information benefits dentists and dental technicians by guiding them in choosing better materials and techniques for implant fittings.

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This research focused on how certain enzymes involved in making melatonin function in the body. The study looked at how various factors, like drugs and health conditions, affect these enzymes' activity. They found that different substances can significantly change how well these enzymes work, which is important because melatonin plays a crucial role in regulating sleep and other bodily functions. Who this helps: This helps patients with sleep disorders and healthcare providers working to manage those conditions.

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This study focused on a surgical procedure called pinealectomy, which involves removing the pineal gland in rats. The researchers outlined the steps for this procedure to better understand how removing this gland affects the animals' sleep patterns and other bodily functions. They emphasize that this technique is essential for studying the role of melatonin and circadian rhythms in animals. Who this helps: This helps researchers studying sleep disorders and circadian rhythms.

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This study focuses on a method called pineal microdialysis, which measures substances like melatonin and other compounds released by the pineal gland in real time over 24 hours. The researchers detailed how to create the tools needed for this method, how to surgically place them, and how to gather the samples for analysis. Understanding how the pineal gland works and what it releases is important for improving our knowledge of sleep, mood, and overall health. Who this helps: This helps researchers and doctors studying sleep disorders and related health issues.

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This study looked at how the pineal gland, which produces the sleep hormone melatonin, works when kept alive in a lab setting. Researchers found that certain chemicals, like norepinephrine, can significantly boost melatonin production. They also explored how different factors, including insulin and specific drugs, affect this process, which is important for understanding sleep regulation, especially in conditions like diabetes. Who this helps: This benefits patients who struggle with sleep disorders, as well as doctors looking for new treatment options.

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This study looked at the effectiveness and safety of essential oils from four plants native to the Brazilian Amazon in killing Aedes aegypti mosquito larvae, which spread dangerous diseases like Dengue and Zika. The researchers found that the essential oils had promising larvicidal effects, killing larvae at concentrations between 41.7 and 275.8 micrograms per milliliter. However, these oils were also harmful to other organisms, indicating that they might not be safe for broader ecological use. Who this helps: This benefits public health officials and researchers working to control mosquito populations and reduce disease transmission.

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This study examined how certain bacteria in the soil help cereal plants grow by providing nitrogen and improving nutrient absorption. Researchers found that these bacteria also influence plant hormones and can help protect plants from diseases. Understanding how these bacteria work can lead to better agriculture practices, potentially enhancing crop yields and sustainability. Who this helps: This helps farmers and agricultural scientists looking to improve crop production.

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This study looked at two methods for fixing the upper jawbone in people with significant bone loss: the all-on-four technique and using long implants that go through the maxillary sinus. Researchers created models to test how well each method held up under pressure, applying a force similar to what a person would experience when biting. They found that both methods showed similar support for the bone, with stress levels being slightly lower in the method using long implants, meaning it could be a safer option for rebuilding the jawbone. Who this helps: This benefits patients with significant jawbone loss who need dental implants.

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This study compared two types of dental materials—low-viscosity and high-viscosity bulk-fill composites—to see how strong they are and how well they bond to teeth when used for filling cavities in molars. The researchers found that both types of materials had similar hardness and strength. Specifically, the low-viscosity composite had fewer instances of breaking away from the tooth but did not significantly outperform the high-viscosity composite in overall strength. This matters because it helps dentists choose materials that can effectively restore molars without compromising quality. Who this helps: Patients with dental restorations.

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This study focused on creating a reliable method to measure the amount of beneficial compounds called phenolics in açaí seed extracts, which are known to contain high levels of tannins. Researchers adapted an existing method and confirmed it worked well, achieving a measurement accuracy of 99.18-101.43% and determining that there are 38 grams of phenolic compounds per 100 grams of açaí seed extract. This is important because it allows for better understanding and potential use of açaí seeds in health-related products. Who this helps: Patients and consumers interested in health supplements from natural sources.

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This study looked at how well different types of resin cements bond with core build-up materials used in dental restorations, both right after they're applied and after being stored in water for nine months. It found that after two days, bonding was strongest with a conventional resin composite, but after nine months, the bond strength decreased for all cement types. However, the core build-up materials maintained stable bonding over time, indicating they work well with cements. Who this helps: Patients needing dental restorations can benefit from more reliable and durable treatments.

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This study looked at how different environments affect the way certain bird species evolve in the tropical mountains of Brazil. Researchers found that birds in these tropical areas have less movement between their populations and show more genetic differences based on the complex environments they live in, compared to birds in subtropical regions. These findings illustrate how small changes in the environment can lead to significant differences in biodiversity, helping us understand why tropical areas are so rich in species. Who this helps: This research benefits conservationists and environmentalists working to protect bird species in tropical ecosystems.

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This study looked at how the thickness of dental filling materials and how they were applied affect the gaps formed inside teeth after temperature changes, simulating conditions inside the mouth. Researchers found that high-viscosity fillings applied in layers created the smallest gaps (about 15 micrometers) before and after temperature changes, while low-viscosity, bulk-fill materials had the largest gaps (up to 45 micrometers) after temperature changes. Understanding these differences helps improve dental filling techniques, ensuring longer-lasting restorations for patients. Who this helps: This helps patients receiving dental fillings.

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This study tested how different whitening toothpastes affect the color, roughness, and hardness of dental enamel. The researchers found that whitening toothpastes made teeth whiter and reduced yellow and red tones significantly more than regular toothpaste. They also discovered that these whitening pastes did not harm the hardness of the enamel and only slightly increased its roughness. Who this helps: This helps patients looking for effective whitening options for their teeth.

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This study examined how a specific microorganism, which helps plants grow by improving nitrogen absorption, reacts to different nitrogen levels. Researchers found that both the normal and mutant versions of this microorganism showed changes in their proteins and metabolites when grown with high or low nitrogen. Specifically, they identified new targets influenced by a key protein called NtrC, which helps the bacteria survive challenging conditions, including oxidative stress, which can damage cells. Who this helps: This benefits farmers and agricultural scientists looking to improve crop yields through better nitrogen use.

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Researchers studied how certain strains of sorghum and sugarcane respond to diseases caused by specific pathogens. Out of 63 sorghum varieties tested, 59 showed symptoms of red stripe disease, and analysis identified several genetic markers related to resistance. The study found that certain genes are activated when the plants were infected, and treating sorghum leaves with specific molecules helped protect them, indicating that these molecules boost the plants' natural defenses. Who this helps: This benefits farmers and agricultural scientists working to improve crop resistance to disease.

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This study looked at the sleep patterns of people with Fabry's disease compared to healthy individuals. Researchers found that those with Fabry's disease took longer daytime naps, averaging 42 minutes more than the control group. This matters because poorer sleep can affect the quality of life for patients, indicating potential behavioral changes linked to melatonin levels. Who this helps: This helps patients with Fabry's disease and their healthcare providers.

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This research looked at how climate change and landscape features affect the genetic differences among certain bird species living in the southern Atlantic Forest mountains. The study found that birds in more dynamic southern areas expanded their populations significantly—by six times—compared to those in the northern areas, which stayed the same. This is important because it shows how birds adapt genetically to changing habitats, which could help with conservation efforts in these regions. Who this helps: This helps conservationists and environmental scientists working to protect bird populations and their habitats.

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This study looked at how a plant extract called Arrabidaea chica (AC) affects the strength of the bond between dental adhesive and tooth dentin over time. The researchers found that adhesive products containing AC had lower bond strength compared to those without it, particularly when AC was mixed into the primer; the bond strength reduced over six months but stabilized by twelve months. These findings are important because they suggest that while some treatments may enhance certain aspects, they can also weaken the bond, potentially affecting the durability of dental repairs. Who this helps: This information benefits dentists and dental patients who need reliable long-lasting dental bonds.

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This study looked at how a natural compound called (+)-α-pinene can work alongside common antibiotics to fight a tough-to-treat bacteria known as Escherichia coli. The researchers found that combining (+)-α-pinene with antibiotics like ceftazidime and amoxicillin improved their effectiveness in stopping bacterial growth. However, they also discovered that using (+)-α-pinene could lead E. coli to resist certain antibiotics, highlighting the need for careful use of these combinations. Who this helps: This research benefits doctors and healthcare professionals focused on treating antibiotic-resistant bacterial infections.

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This study looked at how different types of light (like LED and fluorescent) affect the growth of shoots from a plant called Cedrela fissilis, which is endangered. Researchers found that shoots grown under specific LED light conditions (WBR LED) grew longer and healthier compared to those grown under fluorescent lights, with over 600 proteins identified that changed in response to the light. This is important because it helps scientists understand how to better cultivate this valuable plant species, which has ecological and economic significance. Who this helps: This helps researchers, conservationists, and plant growers focused on endangered species.

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This study looked at how a lack of melatonin affects a type of fat called brown adipose tissue (BAT) in rats, which is important for burning energy. Researchers found that rats without melatonin had a lower ability to increase BAT activity when exposed to cold, showing a 43% decrease in BAT response compared to rats that either had their melatonin replaced or were not affected by the removal. This research matters because it highlights the role of melatonin in regulating energy use and may open the door to new ways to study metabolism in both animals and humans without invasive procedures. Who this helps: This helps patients looking for weight loss solutions and researchers studying metabolic health.

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This study looked at how a light therapy called photobiomodulation can help heal skin wounds by attracting special cells called pericytes, which are important for tissue repair. The researchers found that wounds treated with light had much higher blood flow and more of these healing pericytes compared to untreated wounds. Overall, light therapy sped up the healing process and improved blood supply to the area. Who this helps: This helps patients with skin injuries seeking faster recovery.

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This study examined how certain beneficial bacteria attach to plant roots and promote their growth. Researchers identified around 100 important genes for two types of bacteria, with some related to how the bacteria take in nutrients and others related to movement. Understanding these processes can help enhance the use of these bacteria in agriculture, leading to more sustainable farming practices. Who this helps: This benefits farmers and agricultural scientists looking to improve crop yield and sustainability.

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This study looked at how beneficial bacteria that live inside plant roots affect the plants’ metabolism. The researchers found that plants with bacteria that can fix nitrogen showed higher levels of certain compounds important for growth than those that didn’t. Specifically, metabolites linked to vital growth pathways were increased in plants with the helpful bacteria, while those without them had lower levels of compounds related to nitrogen and energy storage, indicating a struggle for nutrients. Who this helps: This benefits farmers looking for sustainable ways to improve crop yields.

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This study examined how a substance called angiotensin IV (Ang IV) affects melatonin production in the pineal gland of rats. Researchers found that Ang IV significantly boosted melatonin production when cells were stimulated by norepinephrine, similar to the effects of angiotensin II. Additionally, Ang IV appears to work by increasing calcium levels within the cells, while decreasing activity of the insulin-regulated aminopeptidase, which is also present in the pineal gland. Who this helps: This benefits patients who rely on melatonin for sleep and potential treatments for related disorders.

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This study looked at how melatonin affects brown fat tissue in rats, focusing on its role in regulating energy balance and temperature. Researchers found that rats without melatonin production struggled to respond to changes in diet and cold temperatures, showing a decrease in key genes needed for burning fat. When melatonin was given to these rats, their ability to generate heat improved, suggesting that melatonin is important for maintaining healthy metabolism and energy regulation. Who this helps: This research helps patients with metabolic disorders and obesity, as it highlights the potential role of melatonin in improving energy balance.

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Researchers compared two surgical methods—Bristow and Latarjet—for transferring a bone from the shoulder to reduce repeated shoulder dislocations. They reviewed 63 studies including 3,395 shoulders, finding that the Bristow method had a lower rate of dislocation recurrence (1%) compared to the Latarjet method (2.13%). Though both methods effectively reduce dislocations, the Bristow technique may be more effective, as shown by the difference in dislocation rates. Who this helps: This helps patients suffering from shoulder instability.

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This study looked at how melatonin supplementation affects brown fat tissue in patients who have low melatonin levels due to medical treatments. After three months of taking 3 mg of melatonin daily, all four patients showed an increase in brown fat volume and activity, along with improved cholesterol and triglyceride levels. These findings are important because they suggest that melatonin might play a role in managing body fat and cholesterol levels in patients with melatonin deficiency. Who this helps: Patients with melatonin deficiency, especially those undergoing specific medical treatments.

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This study examined how staining substances like coffee and cola affect tooth enamel's color, hardness, and roughness during dental whitening treatments, both done at home and in a dental office. Researchers tested 135 tooth enamel samples from volunteers and found that when cola was used, the enamel became less hard and rougher compared to coffee and the control group. Essentially, tooth whitening worked better without exposure to staining beverages, achieving a brighter color during in-office treatments. Who this helps: This benefits dental patients looking to achieve and maintain whiter teeth.

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This research studied how to create better metal alloys by mixing powdered metals like iron, chromium, and nickel and then heating them in a process called sintering. The researchers developed a new method that helps determine the best conditions for this process, leading to better mixing and improved properties of the resulting alloy. They found that they could achieve good metal mixing and a suitable microstructure by carefully controlling the sintering time and conditions. Who this helps: This benefits metal manufacturers and engineers working with alloy production.

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This study looked at how people with Smith-Magenis syndrome (SMS) respond to light and how this might affect their sleep. Researchers tested five SMS patients and four healthy individuals and found that SMS patients had normal responses to red light, but their response to blue light was altered, leading to quicker recovery times. This suggests that their ability to produce melatonin, a hormone that helps regulate sleep, is impaired, possibly causing their sleep problems. Who this helps: This helps patients with Smith-Magenis syndrome and their doctors by providing insight into their sleep disturbances.

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The study looked at how a lack of melatonin in mother rats during pregnancy and breastfeeding affects the growth and brain development of their baby rats. The researchers found that the baby male rats experienced delays in physical milestones and were worse at tasks requiring memory and learning, but replacing melatonin in the mothers reversed these problems. This matters because it highlights the potential risks for babies if their mothers don't have enough melatonin, particularly for those born to night shift working mothers. Who this helps: Patients, especially mothers and their babies.

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This study focused on a bacterium called Azoarcus olearius DQS-4, found in oil-contaminated soil, and compared its genetic material to another well-known bacterium, Azoarcus sp. BH72. The researchers discovered that DQS-4 shares 98.98% of its genetic makeup with BH72, which indicates that it can also help plants grow by fixing nitrogen and attaching to their roots. This is significant because it shows that even bacteria from challenging environments can be beneficial for agriculture and plant health. Who this helps: This research benefits farmers and agricultural scientists looking for natural ways to enhance crop growth.

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This study looked at how well a dental adhesive bonds to different layers of tooth material when treated with varying concentrations of titanium tetrafluoride (TiF). The research found that the adhesive worked better on the surface layer of teeth compared to the deeper layer, with bond strength values at the surface being significantly higher. Specifically, they reported that the bond strength was better after both 24 hours and 180 days, demonstrating that TiF treatment did not impact the adhesive's effectiveness, and the adhesives maintained their stability over time. Who this helps: This benefits dentists and their patients, particularly those needing dental restorations.

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This study looked at how the daily light and dark cycles affect the communities of bacteria in the soil around plants, specifically focusing on Arabidopsis thaliana. The researchers found that these bacterial communities changed significantly between day and night, with 13% of the bacteria showing these daily fluctuations, especially in families like Burkholderiaceae and Rhodospirillaceae. This is important because it indicates that the bacteria's activity aligns with the plants' daily rhythms, which can influence how well plants grow and use carbon from the soil. Who this helps: This benefits researchers and farmers who are trying to improve plant health and productivity.

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This study looked at how dental bleaching with ozone affects the color and hardness of tooth enamel. The researchers found that all bleaching treatments, including ozone, changed the color of the enamel significantly, but they also caused a decrease in enamel hardness. Importantly, the microhardness dropped significantly after treatments, which raises concerns about the long-term health of the enamel. Who this helps: This information is useful for dentists and patients considering dental bleaching options.