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Dec 2023 DOI 10.14302/issn.2690-4829.jen-23-4799
Gartner PatriziaCorresponding author
Polymer electrolyte membrane (PEM) technologies hold promise for sustainable energy solutions, yet pinhole-related challenges persist. Our research introduces a novel biohybrid approach to self-healing, enhancing multiple healing cycles with minimal membrane disruption. Initial steps involve immobilizing enzymes on a polymeric membrane. This study establishes the immobilization process and analytical framework through enzyme immobilization on polypropylene. Applicability and stability are investigated, laying groundwork for potential Nafion™ applications and advancing climate neutral energy. Qualitative analysis employs colorimetric p-NPA assay on polypropylene-immobilized lipase from Candida rugosa (CRL) and Lipase B from Candida antarctica (CALB). Both enzymes hold their temperature optimum at 50°C which is increased by 10°C via immobilization. Diisopropylcarbodiimide (DIC) is optimal for immobilization. Synchronous enzyme and DIC addition is advantageous. After 8 reuse cycles, immobilized enzymes retain 54.3% residual activity. Immobilizates exposed to PEM fuel cell conditions show better stability due to covalent immobilization than free CRL. Yet, declines occur under stressors like 60 °C and concentrated alcohol. Immobilizates remain resilient at pH 3 and under oxidizing as well as reducing conditions constituted by varied gas atmospheres. Considering PEM fuel cells' operational range, in-depth investigations across conditions are vital. Future studies target long-term PEM fuel cell lifespans, focusing on extremophilic enzymes or modifications for high-temperature stability. Subsequently, the transferability of the immobilization method to Nafion™ shall be deliberated based on the outcomes.
May 2015 DOI 10.14302/issn.2372-6601.jhor-14-493
Prunier1 ECorresponding author
In autologous hematopoietic stem cell transplantation patients for whom granulocyte-colony stimulating factor fails to mobilize a sufficient number of peripheral blood stem cells, plerixafor proposes an option for successful rescue mobilization. This paper evaluates the efficacy of plerixafor to mobilize peripheral blood stem cells (PBSCs) in patients who failed previous mobilization with G-CSF alone, by retrospectively analysing the PBSC results from lymphoma and myeloma (MM) patients between 2006 and 2011. Patients were classified according to the CD34+ cells/kg yield collected by apheresis: < 2 x 106 CD34+ cells/kg was considered collection failure, whereas ≥ 5 x 106 CD34+ cells/kg was considered good mobilization. 797 patients underwent one or more apheresis. The first mobilization success rate was 82%; 140 patients proved to be poor mobilizers. Suboptimal first mobilization was significantly associated with age >50 years (p=0.005) and the absence of chemotherapy in prior PBSCs stimulation (p=0.04). 149 rescue protocols were used in the 140 poor mobilizers, and 71 patients received plerixafor. In univariate analysis the remobilization rate without plerixafor was 42% and increased to 65% when plerixafor was added. In multivariate analysis, plerixafor administration reduced the PBSC remobilization failure risk by a half (OR=0.47). The median value of CD34+ cells/kg in transplants increased from 1.43 (range, 014.03) without plerixafor to 3.85 (range, 0–18.25; p=1 x 10-4) with plerixafor. There were more good mobilizers after plerixafor use (35% with plerixafor versus 15% without plerixafor; p=0.005). Plerixafor efficacy was similar for lymphoma (60% remobilization) and MM (80%; p=0.12). These data show that plerixafor was effective in poor mobilizers and that it synergized with G-CSF to improve the quantity of collected PBSCs. Plerixafor also increased transplant feasibility by 23%. While the clinical results of this study are promising, economic data were not taken into account and there is a need for real work concerning the cost-effectiveness of this treatment. We propose a subsequent study in which the economic efficacy of plerixafor’s use is evaluated based on the financial aspects of the treatments received by the cohort evaluated in this paper.
Feb 2026 DOI 10.14302/issn.2689-4602.jes-25-5926
Easttom ChuckCorresponding author
The impact of ionizing radiation on genetic change is well established, yet the extent to which naturally occurring radiation fields have influenced evolutionary trajectories remains incompletely understood. This study examined correlations between microbial evolution and the radiation and geochemical environments associated with natural fission reactors, with emphasis on the Oklo–Bangombé system in present-day Gabon, Africa. The current paper compares plausible doserate regimes adjacent to reactor zones with published observations of radiationinduced phenotypes, geneexpression changes, and repair strategies in model organisms and complex biotas. This study further considers indirect mechanisms (e.g., water radiolysis, redox restructuring, tracemetal mobilization) by which natural reactors could have modulated ecological selection pressures over long timescales. The synthesis supports the plausibility of three interacting pathways: (i) increased mutation supply under low, chronic dose rates; (ii) selection in oxidantrich, redoxstratified niches; and (iii) metabolic subsidies (e.g., H₂) from radiolysis that support chemotrophic guilds. Although temporal–spatial associations exist between reactor activity and biological innovations preserved in Paleoproterozoic strata of Gabon, current evidence remains correlational rather than demonstrably causal. The study further outlines testable predictions and experimental designs capable of discriminating among these mechanisms.
Oct 2021 DOI 10.14302/issn.2641-7669.ject-21-3970
Dias Toledo Arruda-Neto JoaoCorresponding author
Linear Accelerator Laboratory, Physics Institute, University of Sao Paulo, São Paulo-SP, Brazil
Microcystins (MCs) are toxins profusely synthesized by cyanobacteria, causing livestock poisonings and endangering human health. We design and execute an experiment to investigate the attenuation (degradation) of microcystins by exposing them to gamma radiation and electron beams at doses of 0 (control), 3, 5, 10 and 15 kGy. The experimental conditions simulate microcystin contamination of aquatic environments; we thus consider (1) microcystins inside whole cells and extracellular dissolved in water, simulated by non-sonicated and sonicated cells, respectively, and (2) two acute microcystin concentrations within water. Toxicity tests of Microcystis aeruginosa detected immobilization (i.e., paralysis) of Ceriodaphniasilvestrii exposed to aqueous crude extracts of irradiated and non-irradiated M. aeruginosa (NPLJ-4 strain) at concentrations of 45 and 90 mg.L-1 (mg dry weight of freeze-dried material), and the results were analyzed using the Trimmed Spearman-Karber statistical program to obtain 48-h EC50, the average effective concentration causing immobility in 50% of organisms after 48 hours. We conclude that electron beams are effective physical agents for toxin attenuation (degradation) and reach 100% effectiveness at 5 kGy and above; their efficiency is two orders of magnitude greater than that of gamma radiation. This new body of information contributes to (1) remediating environmental water sources; (2) designing water/wastewater treatment facilities; (3) combatting chronic microcystin environmental contamination; and (4) inspiring further studies to promote the use of biomonitors (e.g., Cladocerans) to detect and evaluate microalgae contamination.
Jun 2021 DOI 10.14302/issn.2692-1537.ijcv-21-3758
Hewageegana NS RajapaksaCorresponding author
National Consultant Health System Enhancement Project Sri Lanka
“Health Promoting Village” concept named as “Happy Villages” started in 2007 in Badulla District in Uva Province was a community mobilization process through which village communities have been empowered to look after their community health. The areas included were Early Childhood Care and Development (ECCD), Non-Communicable Diseases (NCD) prevention , Alcohol and drug abuse. Gender Based Violence. The programmed used many interactive tools as “Mood Chart” or “Happiness Calendar” which was giving a visualizing effect. Continuous assessments done from 2009 to 2013 showed that the Health promotion strategies used in the Happy Village concept in the Uva Province can effectively and efficiently be utilized for improvement of nutrition and achievement of milestones in children. From 2017 a National program is launched named “Happy Villages”. During the Covid 19 outbreak health promotion approaches were initiated to change in lay communities successfully. Villagers had actively engaged, collectively acted in responsible manner, and identified measures to prevent COVID-19 transmission in their households, neighbourhood and community. The use of village empowerment had become a fruitful source to face the Covid pandemic in Sri Lanka. Almost 300 “Happy Villages” around the country have made facing the Covid epidemic their chief task. Many innovative ideas and practices in facing Covid 19 pandemic at village level including a visualizing calendar to identify the risk behaviours of the family members as well as the Happiness calendar to identify the family stress levels are among them. Health promotion concept is getting rooted around the country with active participation of the villages with a multisectoral support. Continuous monitoring and evaluation and sharing best practices will show the world the effectiveness of Health Promotion and the ability of empowered people in facing pandemic situations
Jan 2019 DOI 10.14302/issn.2470-5020.jnrt-18-2555
Ya. Abdullaiev RizvanCorresponding author
Kharkiv Medical Academy of Postgraduate Education, Department of Ultrasound Diagnostics, Ukraine
Introduction: Tension-type headache (TTH) is very common, with a lifetime prevalence in the general population ranging in different studies between 30% and 78%. TTH, divided into episodic and chronic types, introduced in the manual "International Classification of Headache Disorders"(ICHD-I), is of practical importance. Infrequent episodic headaches (no more than once a month) may not require drug therapy, but, on the contrary, frequent forms may require expensive treatment. Objective: To study the state of cerebral hemodynamics and cerebrovascular reactivity in patients with Tension-type headache and evaluate the efficacy of treatment with Phenibite using Doppler ultrasound. Materials and Methods: A retrospective analysis of the results of ultrasound dopplerography of the anterior, middle and posterior cerebral arteries (ACA, MCA and PCA), Vertebral and Basal (VA, BA) arteries was performed in 188 patients with TTH. Among them are infrequent episodic TTH - 68 (36,2%) patients, frequent episodic TTH - 64 (34,0%) patients, chronic TTH - 56 (29,8%) patients. The age of the subjects was 18-45 years, among them 85 (45.2%) men and 103 (54.8%) women. The maximum systolic velocity (Vs), the end diastolic velocity (Vd), the resistance and pulsativity indexes (RI, PI) in all vessels were determined. Patients were given consent to participate in the study. Results: Infrequent episodic (IFE) TTH were recorded in 86.4% of cases, frequent episodic (FE) — in 88.9%, and chronic (Ch) TTH — in 81.6% of cases. Bilateral TTH was noted in 39.2%, frontal localization - in 35.6%, in the occipital region - in 25–7% of cases. The asymmetry of the maximum systolic blood flow velocity (Vs) in the paired arteries within 20-30% was considered a violation of cerebral hemodynamics, which was detected in 38.7% of patients. An increase in Vs was noted in all cerebral vessels, especially in patients with FE TTH and chronic Ch TTH compared with the control group. In patients with IFE TTH the average value of RcFMt was 1.24±0.03, in patients with FE TTH - 1.25±0.02, in patients with Ch TTH - 1.27±0.03. In patients with TTH, hyper-responsiveness to hypercapnic test was detected: RcCO2 was 1.43±0.05 in the group with FE TTH; 1.39±0.07 in the group of Ch TTH and 1.37±0.04 in the group of IFE TTH, which indicates a tendency for the tension of the vasodilator regulation mechanism even in clinically insignificant forms of TTH. In the study of reactivity to the O2-test, a hyporeactive response was observed in the groups with FE TTH and Ch TTH (0.38±0.04 and 0.35±0.05, respectively. The treatment with Phenibut carried out in a step-by-step manner - during the first week the drug was applied at a dose of 250 mg 2 times a day, over the next 6 weeks the dose increased to 500 mg 2 times a day, then the dose was reduced back to 250 mg 2 times a day. Among patients with FE TTH, the frequency of headache decreased from 5.7±2.3 to 3.6±2.1 days/month, and in patients with Ch TTH - from 22.8±1.7 to 17.7±1,3 days/month (P<0,05). Influence of the drug was manifested at the initially increased RcFMt and RcCO2. A decrease in initially elevated RcCO2 was noted in all (FE TTH, ChTTH, IFETTH) clinical groups. However, this decrease was not statistically significant. Conclusion: In patients with TTH, an increase in the Vs is more often recorded, their asymmetry in the middle cerebral artery. Hyperreactivity on CO2-load is typical for patients with chronic TTH, and reflects the mobilization of metabolic regulation of cerebral blood flow. Conducting FMt was the most informative method for detecting autoregulatory disorders mainly in patients with IFE TTH. FE TTH in patients is characterized by the presence of a hyperactive reaction to hypercapnic and orthostatic tests, probably due to mobilization of humoral-metabolic and neurogenic links of regulation. In the group of patients with chronic TTH prevails hyporeactivity for hyperventilation test, reflecting the depletion of vasoconstriction reserve. The use of Phenibut(Noophen® (JSC Olainfarm Latvia in the treatment of TTH is accompanied by a decrease in the frequency of pain, and of pericranial muscle tone, most pronounced in patients with FE TTH. It's effectiveness is evident in the normalization of the coefficients of cerebrovascular reactivity in a patients with chronic TTH. The minimal statistical significance was observed on the dynamics of blood flow only in the VA.
Apr 2018 DOI 10.14302/issn.2578-8590.ipj-18-2018
Hinzpeter JaimeCorresponding author
Medical Doctor, University of Chile, Clinical Hospital, Santiago Chile
Objective: The purpose of this study is to evaluate the use of paralytic shellfish poisoning toxin in a patient with arthrofibrosis of the knee. Arthrofibrosis is a common complication of knee surgery that tends to manifest itself as a limitation of the musculoskeletal ranges. Paralytic shellfish poisoning toxin has been proposed as an alternative treatment for painful musculoskeletal pathologies. Subjects: Use of paralytic shellfish poisoning toxin in arthroscopic menisectomy. Case report. Methods: Three doses of paralytic shellfish poisoning toxin were administered in an intra-articular manner on different days. Functionality, musculoskeletal ranges, pain at rest and pain during motion were evaluated. Results: The current alternatives for management of arthrofibrosis include the use of oral steroids, physiotherapy, mobilization under anesthesia and the liberation of arthroscopic debris. This case is the first report of the use of paralytic shellfish poisoning toxin. The adverse effects the patient presented coincided with those described in the literature but without the presence of severe reactions. Improvement in functional tests, progress in musculoskeletal ranges and a decrease in the level of pain were achieved. Adverse effects included parenthesia and a feeling of weightlessness.
Feb 2017 DOI 10.14302/issn.2476-1710.jdt-16-1346
D. Deiko RomanCorresponding author
Post-graduate student of the department of pharmacology of National University of Pharmacy
Theaim of study is to evaluate antidepressant-like activity of the new peptidergic neuroprotectoracetyl-(D-Lys)-Lys-Arg-Arg-amide, homologous of ACTH15-18 primary amino acids sequence, that demonstrates nootropic and neuroprotective properties. Using Porsolt swimming test (PST) efficacy of tetrapeptide neuroprotector KK-1 at a single dose of 0.02 mg/kg was investigated on 16 white random bred male rats (body mass equaled 180-220 grams). Imipramine (15 mg/kg i.p.) was used as a reference drug. Then depression was induced in these rats by reserpine (4 mg/kg, i.p.). The KK-1 (intranasally, i.n.) and imipramine were administered once a day during 3 days until the reserpine-induced depression was reproduced. The indices of rats behavior under the conditions of open-field test (OFT) and PST were evaluated. The influence of both drugs on specific reserpine-induced depressions symptoms (hypothermia and blepharoptosis) was also registered. The results were processed statistically. The tetrapeptide neuroprotector KK-1 reduced immobilization time of rats at PST (statistically significant differences compared with control group), exceeding efficacy of reference drug imipramine. Normalizing of locomotor and exploratory activity in the OFT, decreasing indices of rats helplessness behavior in PST by tetrapeptide neuroprotector KK-1 demonstrates its antagonism with depressive action of reserpine. The tetrapeptide KK-1 showed antidepressant-like action both in intact rats and in rats with the model of reserpine-induced depression. It reduced specific symptoms of depression – hypothermia and blepharoptosis, exceeding the activity of reference drug imipramine.