Publications by authors named "Demain A"

Article Synopsis
  • The study investigates the effectiveness of cell-free DNA (cfDNA) testing for detecting fetal aneuploidies in women with triplet pregnancies, as current data is limited compared to singleton pregnancies.
  • The research involved a retrospective analysis of 255 women who underwent cfDNA testing between 2017 and 2020, focusing primarily on trisomy 21 (T21) and secondarily on trisomy 18 (T18) and trisomy 13 (T13).
  • Results indicated that cfDNA testing can serve as a primary screening tool for major fetal aneuploidies in triplet pregnancies, highlighting the importance of informed patient consent before proceeding with the test.
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Self-care behaviors are critical to manage the adverse impact of heart failure disease. However, engaging in self-care behaviors such as physical activity or daily weight-monitoring can be difficult due to lack of knowledge or motivation. Digital games can serve as an alternative to traditional patient education to provide information and motivate engagement in critical self-care behaviors.

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Microorganisms are remarkable producers of a wide diversity of natural products that significantly improve human health and well-being. Currently, these natural products comprise half of all the pharmaceuticals on the market. After the discovery of penicillin by Alexander Fleming 85 years ago, the search for and study of antibiotics began to gain relevance as drugs.

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Wilson's disease (WD), a rare genetic disorder responsible for copper accumulation in the body, is fatal if left untreated. Although there are effective treatments, adherence to treatment tends to be low. We evaluated the medication adherence of 139 patients using the Morisky scale.

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Article Synopsis
  • The study investigates how the COVID-19 pandemic affected self-care practices for older adults with heart failure (HF), emphasizing the challenges they faced in managing their health.
  • Researchers conducted phone interviews with 17 older adults in central Texas, revealing negative impacts on physical activity due to isolation, financial issues, and difficulties accessing essential medications and food.
  • The findings highlight the importance of recognizing vulnerabilities and implementing coping strategies, such as utilizing technology for social connections, to enhance health outcomes and quality of life for older adults with HF during crises like the pandemic.
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Article Synopsis
  • This study investigates the effectiveness of cell-free DNA (cfDNA) testing for detecting chromosomal abnormalities (trisomy 21, 18, and 13) in pregnant women with abnormal HCG and PAPP-A levels, indicating higher risks for complications.* -
  • The analysis involved 477 women and showed that cfDNA testing had a 100% sensitivity and specificity for identifying trisomy 21, with other trisomies detected as well, contributing to its reliability as a screening tool.* -
  • Additionally, the study aimed to assess cfDNA's role in predicting vascular complications during pregnancy, finding a few cases of hypertension among the participants.*
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In recent years, the number of pathogenic microorganisms resistant to antibiotics has increased alarmingly. For the next 10-20 years, health organizations forecast high human mortality caused by these microorganisms. Therefore, the search for new anti-infectives is quite necessary and urgent.

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Article Synopsis
  • - Recent studies hinted at a link between heparin treatment and non-reportable cell-free DNA (cfDNA) test results, but lacked solid methodology to prove this connection.
  • - Researchers conducted a retrospective analysis of pregnancies with non-reportable cfDNA results and found that heparin treatment was present in only a small percentage, suggesting other factors were more influential.
  • - In lab tests, heparin showed no effect on fetal DNA measurements, indicating it does not influence the accuracy of cfDNA screening for aneuploidies.
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One of the greatest sources of metabolic and enzymatic diversity are microorganisms. In recent years, emerging recombinant DNA and genomic techniques have facilitated the development of new efficient expression systems, modification of biosynthetic pathways leading to new metabolites by metabolic engineering, and enhancement of catalytic properties of enzymes by directed evolution. Complete sequencing of industrially important microbial genomes is taking place very rapidly, and there are already hundreds of genomes sequenced.

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Article Synopsis
  • Cell-free DNA (cfDNA) screening shows promising results compared to maternal serum screening (MSS), especially for pregnancies from assisted reproduction technologies (ART).
  • In a study with 794 pregnancies, cfDNA had a false-positive rate of 0% and a positive predictive value of 100%, while MSS had higher false-positive rates, particularly in ART pregnancies.
  • The findings indicate that cfDNA is more effective than MSS and could reduce the need for invasive procedures in all types of pregnancies, suggesting it should be the preferred primary screening method.
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Fermentative production of amino acids is an important goal of modern biotechnology. Through fermentation, micro-organisms growing on inexpensive carbon and nitrogen sources can produce a wide array of valuable products including amino acids. The amino acid market is $8 billion and mainly impacts the food, pharmaceutical and cosmetics industries.

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Streptomyces platensis MA7327 is a bacterium producing interesting antibiotics, which act by the novel mechanism of inhibiting fatty acid biosynthesis. The antibiotics produced by this actinomycete are platensimycin and platencin plus some minor related antibiotics. Platensimycin and platencin have activity against antibiotic-resistant bacteria such as methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus; they also lack toxicity in animal models.

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Beginning with the discovery of penicillin by Alexander Fleming in the late 1920s, antibiotics have revolutionized the field of medicine. They have saved millions of lives each year, alleviated pain and suffering, and have even been used prophylactically for the prevention of infectious diseases. However, we have now reached a crisis where many antibiotics are no longer effective against even the simplest infections.

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Objective: To describe the relation between gaze and posture/gait control in Parkinson disease (PD) and to determine the role of the mesencephalic locomotor region (MLR) and cortex-MLR connection in saccadic behavior because this structure is a major area involved in both gait/postural control and gaze control networks.

Methods: We recruited 30 patients with PD with or without altered postural control and 25 age-matched healthy controls (HCs). We assessed gait, balance, and neuropsychological status and separately recorded gait initiation and eye movements (visually guided saccades and volitional antisaccades).

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We are pleased to dedicate this paper to Dr Julian E Davies. Julian is a giant among microbial biochemists. He began his professional career as an organic chemistry PhD student at Nottingham University, moved on to a postdoctoral fellowship at Columbia University, then became a lecturer at the University of Manchester, followed by a fellowship in microbial biochemistry at Harvard Medical School.

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This review aims at comparing some historical data with the current situation in the study of biogenesis of natural compounds, antibiotics in the first place. Biogenesis of tetracyclines and cycloheximide and related compounds serves as example. Examples of molecular biological and bioinformatics methods used in the study of antibiotic biogenesis are described both in terms of its historical aspects and the current knowledge.

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Modern research has focused on the microbial transformation of a huge variety of organic compounds to obtain compounds of therapeutic and/or industrial interest. Microbial transformation is a useful tool for producing new compounds, as a consequence of the variety of reactions for natural products. This article describes the production of many important compounds by biotransformation.

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Gait and balance disorders are the major source of motor disabilities in advanced forms of Parkinson's disease (PD). Low-frequency stimulation of the pedunculopontine nucleus area (PPNa-DBS) has been recently proposed to treat these symptoms with variable clinical results. To further understand the effects of PPNa-DBS on resistant gait and balance disorders, we performed a randomised double-blind cross-over study in six PD patients.

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Microbial enzymes are of great importance in the development of industrial bioprocesses. Current applications are focused on many different markets including pulp and paper, leather, detergents and textiles, pharmaceuticals, chemical, food and beverages, biofuels, animal feed and personal care, among others. Today there is a need for new, improved or/and more versatile enzymes in order to develop more novel, sustainable and economically competitive production processes.

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The pathophysiology of gait and balance disorders in elderly people with 'higher level gait disorders' (HLGD) is poorly understood. In this study, we aimed to identify the brain networks involved in this disorder. Standardised clinical scores, biomechanical parameters of gait initiation and brain imaging data, including deep white matter lesions (DWML) and brain voxel-based morphometry analyses, were assessed in 20 HLGD patients in comparison to 20 age-matched controls.

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The actinomycete Streptomyces platensis produces two compounds that display antibacterial activity: platensimycin and platencin. These compounds were discovered by the Merck Research Laboratories, and a complex insoluble production medium was reported. We have used this medium as our starting point in our studies.

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Microbes are the leading producers of useful natural products. Natural products from microbes and plants make excellent drugs. Significant portions of the microbial genomes are devoted to production of these useful secondary metabolites.

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