Dispersed Form Research Articles

ИССЛЕДОВАНИЕ ФАРМАКОКИНЕТИКИ ТВЕРДОДИСПЕРСНОЙ И КРИСТАЛЛИЧЕСКОЙ ФОРМ АНТИВИРУЛЕНТНОГО СРЕДСТВА ФТОРТИАЗИНОН У КРЫС

Prevalent drug resistance of pathogenic bacteria is a major concern for healthcare. Decreased bacterial susceptibility to antibiotics reduces treatment efficiency, putting lives of patients at risk. To overcome this issue, a novel anti-virulence drug Fluorothiazinon (FT) was developed. The drug inhibits type three secretion system and flagella motility of many Gram-negative bacteria. It showed therapeutic activity against a number of pathogenic microorganisms, such as Pseudomonas aeruginosa, Acinetobacter baumannii, Chlamydia trachomatis and Salmonella enterica Typhimurium among others. To find appropriate form for subsequent drug development solid dispersion and crystalline forms of FT were manufactured. In this study we aimed to investigate pharmacokinetics of FT in two forms to find the formulation with higher bioavailability. For comparative pharmacokinetics study rats were allocated to receive a single oral dose 50 mg/kg of the drug in either solid dispersion or crystalline forms. Determination of FT and its metabolite was carried out by high-performance liquid chromatography – tandem mass-spectrometry analysis. Our results show that the solid dispersion form of Fluorothiazinon has a higher oral bioavailability of 235.4% compared to the crystalline form in rats. Therefore, solid dispersion form was demonstrated to be more suitable for dug development to have enhanced bioavailability, leading to increased absorption and possible improved therapeutic potential of the developed drug based on pharmacokinetics data.

Mucoadhesive pickering nanoemulsions via dynamic covalent chemistry

Hypothesis. Submicron oil droplets stabilized using aldehyde-functionalized nanoparticles should adhere to the primary amine groups present at the surface of sheep nasal mucosal tissue via Schiff base chemistry. Experiments. Well-defined sterically-stabilized diblock copolymer nanoparticles of 20 nm diameter were prepared in the form of concentrated aqueous dispersions via reversible addition-fragmentation chain transfer (RAFT) aqueous emulsion polymerization of 2,2,2-trifluoroethyl methacrylate (TFEMA) using a water-soluble methacrylic precursor bearing cis-diol groups. Some of these hydroxyl-functional nanoparticles were then selectively oxidized using an aqueous solution of sodium periodate to form a second batch of nanoparticles bearing pendent aldehyde groups within the steric stabilizer chains. Subjecting either hydroxyl- or aldehyde-functional nanoparticles to high-shear homogenization with a model oil (squalane) produced oil-in-water Pickering macroemulsions of 20–30 µm diameter. High-pressure microfluidization of such macroemulsions led to formation of the corresponding Pickering nanoemulsions with a mean droplet diameter of around 200 nm. Quartz crystal microbalance (QCM) experiments were used to examine adsorption of both nanoparticles and oil droplets onto a model planar substrate bearing primary amine groups, while a fluorescence microscopy-based mucoadhesion assay was developed to assess adsorption of the oil droplets onto sheep nasal mucosal tissue. Findings. Squalane droplets coated with aldehyde-functional nanoparticles adhered significantly more strongly to sheep nasal mucosal tissue than those coated with the corresponding hydroxyl-functional nanoparticles. This difference was attributed to the formation of surface imine bonds via Schiff base chemistry and was also observed for the two types of nanoparticles alone in QCM studies. Preliminary biocompatibility studies using planaria indicated only mild toxicity for these new mucoadhesive Pickering nanoemulsions, suggesting potential applications for the localized delivery of hydrophobic drugs.

Insights into SnO2 Nanoparticles Supported on Fibrous Mesoporous Silica for CO Catalytic Oxidation

A large surface area dendritic mesoporous silica material (KCC-1) was successfully synthesized and used as a support to confine SnO2 nanoparticles (NPs). Owing to the large specific surface area and abundant mesoporous structure of dendritic KCC-1, the SnO2 NPs were highly dispersed, resulting in significantly improved CO catalytic oxidation activity. The obtained Snx/KCC-1 catalysts (x represents the mass fraction of SnO2 loading) exhibited excellent CO catalytic activity, with the Sn7@KCC-1 catalyst achieving 90% CO conversion at about 175 °C. The SnO2 NPs on the KCC-1 surface in a highly dispersed amorphous form, as well as the excellent interaction between SnO2 NPs and KCC-1, positively contributed to the catalytic removal process of CO on the catalyst surface. The CO catalytic removal pathway was established through a combination of in situ diffuse reflectance infrared transform spectroscopy and density-functional theory calculations, revealing the sequential steps: ① CO → CO32−ads, ② CO32−ads → CO2free+SnOx−1, ③ SnOx−1+O2 → SnOx+1. This study provides valuable insights into the design of high-efficiency non-precious metal catalysts for CO catalytic oxidation catalysts with high efficiency.

Improving the Dissolution rate of Mefenamic acid by preparing Solid Dispersions with Polyethylene glycol 4000

The low solubility of drugs is the main reason for the decrease in bioavailability and, consequently, the therapeutic effect. Solid dispersions prepared using water-soluble polymers are a promising approach to solving this problem while maintaining the hydrophobic nature of the drug and reducing the dose load. The aim of this study was to enhance the solubility and the dissolution rate of mefenamic acid by formulating it in the form of solid dispersions. The solid dispersions were prepared by kneading method using polyethylene glycol 4000 as a carrier in various proportions. The dissolution test was performed for two hours in phosphate buffer (pH=8) and the drug release kinetics were studied using several mathematical models. The results showed that polyethylene glycol enhanced the dissolution rate of mefenamic acid in prepared formulations, and the higher the ratio (carrier: drug), the faster the drug dissolved. The best fit to the kinetic model was observed with the Higuchi and Ritger-Peppas models, indicating drug release via Fickian diffusion.

Оценка эффективности и безопасности применения диспергируемой формы силденафила (50 мг) у мужчин с нарушением эректильной функции

Оценка эффективности и безопасности применения диспергируемой формы силденафила (50 мг) у мужчин с нарушением эректильной функции

Study on development and tissue permeation of different formulations of Fasudil.

The study is intended to formulate Fasudil loaded vesicular system for application in the management of angina. Fasudil was made into a complex with phospholipid, and other different formulations were made, including Fasudil solution, liposomal form, and Fasudil loaded into the gel. A drug characterization study was conducted and noted. Drug release was quantified and analyzed and, finally, inoculated in Sprague-Dawley rats. These rats underwent anginal induction, and each formulation's effect on angina was evaluated. Drug solution (F-Phos) and F-Phos-Lipo (liposomal dispersion form of the drug) have shown that more than half percent of them have been released within 1.5 hours, and the rapid release occurred from liposomal dispersion in the first hour. The study determined the viscosity of the different formulations, which was significantly (p<0.05) higher than the theoretical sum of the viscosity of each formulation. The study found that the F-Phos-Lipo+P-407HMS formulation is the most effective as its application has the minimum infarct area percentage compared to the other formulations and can also reduce creatine kinase levels significantly as compared to the different formulations (p<0.05). The study concluded that the typical gel formulation (liposomal Fasudil dispersed in hydroxypropyl methylcellulose solution, which is added to blank poloxamer 407) had been shown to have significantly anti-anginal properties, including easy administration, its application on the infarct area percentage and subsequently its pharmacological effect on the cardiac tissue.

Native Nickel–Iron Metals from Lonar Crater Impactites (India) and Regolith of the Moon

The Lonar crater (India) is the best preserved and most studied on Earth, formed in basalts, which makes it possible to conduct a comparative study with impact transformations of mineral matter on the Moon and other planets of the Solar System. Comparative studies have shown that impactor material, both on the Earth and on the Moon, is present in impactites not only in a geochemically dispersed form, as previously thought, but also in the form of individual submicron particles distributed in the molten target material. These are particles of native nickel, taenite, and high-nickel kamacite, which, apparently, are the transformed material of the impactor. High-nickel submicron metal inclusions are widespread in the impactites of the Lonar crater, as they were found in all studied preparations made from materials collected from different points along the rim of the crater. The high-nickel particles found in this study are an additional argument in favor of the previously stated assumption about the chondrite type of impactor.

Generation of cellulose from Saccharum officinarum pseudostem bagasse and its application as solubility enhancer in albendazole solid formulation

Formulations of poorly aqueous soluble drugs in different polymers based on solid dispersion method have been used to improve its solubility and drug bioavailability. The aim of this study was to formulate albendazole solid dispersion utilising cellulose obtained from saccharum officinarum pseudostem bagasse and characterised. Herein, a 32 factorial design was used to factor out 9 combinations of the generated cellulose (GC) and lactose. In each case, the combination was blended with albendazole, processed using solvent-evaporation technique and adjuvant into a solid dispersion form (SD). The SD was granulated with starch and lubricated with magnesium stearate. Thermal analysis based on differential scanning calorimetry (DSC) and Fourier transmission infrared spectrophotometer (FT-IR) were carried out on the cellulose, drug and the granules. The micromeritic properties of the granules, and drug entrapment efficacy and dispersion-number of aqueous constitution of the granules were determined. The DSC result showed amorphous GC and granules. FT-IR analysis showed no compatibility or interaction problem based on the functional peaks observed. The granules exhibited micromeritics properties (p &gt; 0.05); rate of consolidation &lt; 0.43 and Carr’s indices &lt; 23.53, drug entrapment efficacy &gt; 93 % and dispersion-number &lt; 4.33. The granules dissolution rates after 10 and 60 mins were &gt; 94.11 % and &gt; 68.52 % respectively. These granules properties peaked with the GC and lactose combination at 20 % each. Albendazole formulation based on the cellulose obtained from sugarcane showed a promised alternative for improved dissolution and possible bioavailability enhancement.

The extent of reaction traced by determination of N2 content for synthesised cationic biodegradable polymer flocculant

AbstractBiodegradable “green” and safe substitutes to minimize environmental and health risks are drawing extensive attention for research interest. This research aims to create a water‐soluble cationic starch‐grafted biodegradable polymer that can be used as a flocculant. As polymers are strong molecules that carry charges, they are effective flocculants. Saturated polymer chains do not change the pH value on adding to wastewater. The reactive groups of the starch, i.e., hydroxyls, form a complex with cations present in the reagent. According to the proposed strategy outlined in the research, the mechanism of free radical graft copolymerization of ethyl monomers onto starch should proceed as expected. In presence of molecular nitrogen, H+ may be replaced by reactive group R, i.e., CH2CH2N (Et3) (triethylamine) in a highly alkaline medium. During the work, it was observed that starch‐based flocculant exhibits a high degree of cationic charge. Developed cationic flocculant performs well in a liquid dispersion form, is fast‐acting and effective, and is suitable for treating industrial wastewater. It combines low sludge formation with cost‐effectiveness. The paper will discuss important practical considerations to increase the %N2 by changing the reaction parameters of the polymer produced and its effect on flocculation efficiency.

Comparative Study of the U(VI) Adsorption by Hybrid Silica-Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels.

Two different silica conformations (xerogels and nanoparticles), both formed by the mediation of dendritic poly (ethylene imine), were tested at low pHs for problematic uranyl cation sorption. The effect of crucial factors, i.e., temperature, electrostatic forces, adsorbent composition, accessibility of the pollutant to the dendritic cavities, and MW of the organic matrix, was investigated to determine the optimum formulation for water purification under these conditions. This was attained with the aid of UV-visible and FTIR spectroscopy, dynamic light scattering (DLS), ζ-potential, liquid nitrogen (LN2) porosimetry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Results highlighted that both adsorbents have extraordinary sorption capacities. Xerogels are cost-effective since they approximate the performance of nanoparticles with much less organic content. Both adsorbents could be used in the form of dispersions. The xerogels, though, are more practicable materials since they may penetrate the pores of a metal or ceramic solid substrate in the form of a precursor gel-forming solution, producing composite purification devices.

Awareness of testicular cancer and testicular self-examination in young adults, and the efficacy of education-based media.

e17022 Background: The prevalence of testicular cancer in adolescents and young adults creates a unique opportunity for education through social media. We investigated this populations’ baseline knowledge of testicular cancer (TC) and testicular self-examination (TSE) and identified the efficacy of various forms of media in educating young individuals. Methods: A survey was designed to assess participants’ baseline knowledge of TC and TSE. Participants were randomly shown one of three forms of educational media created by the Testicular Cancer Society and the National Cancer Institute. These were an infographic, a short (60 second) and a long (6 minute) video. Participants were then asked to correctly identify facts regarding TC and TSE. Baseline knowledge was analyzed by age (&lt; 24 vs. &gt; 25), and post-media knowledge was analyzed to determine the efficacy of each media form. Results: Responses from 328 participants were analyzed, with a mean age of 24.3 years, 40.9% male, 72.0% white, and 70.7% graduated college or a graduate program. Only 30.7% of participants reported being educated about TC, 25.9% correctly identified the 15-35 age group as having the highest prevalence of TC, and 26.3% correctly identified the TC survival rate as being 75-100%. The &gt; 25-year-old group were significantly more likely to have heard of TSE (p &lt; 0.001), performed a TSE if male (p = 0.043), encouraged males to perform TSE if female (p &lt; 0.001) and correctly identify TC survival rate (p = 0.006) and treatability (p = 0.007). Long video viewers were significantly less likely to watch it in its entirety compared to infographic and short video viewers, and they were less likely to report an understanding of TSE compared to infographic viewers. Short video viewers were less likely to have properly identified the TC survival rate compared to both infographic (P &lt; 0.001) and long video viewers (p = 0.001). Conclusions: Overall there is poor awareness and education regarding TC and TSE, with adolescents performing significantly worse than young adults. The infographic performed the best overall in completion and education about TC and TSE, with the short video performing similarly well, and the long video performing the worst. This suggests that easily dispersed and viewable forms of media may be the most effective tool for educating young people.[Table: see text]

Preliminary Study on the Development of Caffeine Oral Solid Form 3D Printed by Semi-Solid Extrusion for Application in Neonates.

Apnea of prematurity can be treated with a body-weight-adjusted dosage of caffeine. Semi-solid extrusion (SSE) 3D printing represents an interesting approach to finely tailor personalized doses of active ingredients. To improve compliance and ensure the right dose in infants, drug delivery systems such as oral solid forms (orodispersible film, dispersive form, and mucoadhesive form) can be considered. The aim of this work was to obtain a flexible-dose system of caffeine by SSE 3D printing by testing different excipients and printing parameters. Gelling agents (sodium alginate (SA) and hydroxypropylmethyl cellulose (HPMC)) were used to obtain a drug-loaded hydrogel matrix. Disintegrants (sodium croscarmellose (SC) and crospovidone (CP)) were tested for get rapid release of caffeine. The 3D models were patterned by computer-aided design with variable thickness, diameter, infill densities, and infill patterns. The oral forms produced from the formulation containing 35% caffeine, 8.2% SA, 4.8% HPMC, and 52% SC (w/w) were found to have good printability, achieving doses approaching to those used in neonatology (between 3 and 10mg of caffeine for infants weighing approximately between 1 and 4kg). However, disintegrants, especially SC, acted more as binder/filler, showing interesting properties to maintain the shape after extrusion and enhance printability without a significant effect on caffeine release.

Acute bacterial sinusitis: current concepts in antibiotic therapy

Acute rhinosinusitis is a widespread pathology faced by both outpatient doctors and otorhinolaryngologists in hospitals. At the same time, only understanding of the principles for diagnosing various forms of sinusitis, in particular, the criteria for bacterial sinusitis, provides the adequate treatment decisions. Antibacterial therapy plays a key role in the treatment of patients with acute bacterial sinusitis. Additionally, there is an increasing frequency of the antibiotic resistance of the main bacterial pathogens in the respiratory group of diseases. Both in Russian and foreign clinical guidelines, the so-called lines of antibacterial therapy are clearly identified. Strict adherence to the national recommendations and a thorough analysis of clinical and anamnestic data allows a rational approach to the choice of an antibacterial drug. There is an increase in the rate of uncontrolled and inadequate antibacterial therapy, particularly using of penicillins and short course of macrolides, over the last decade. Such trend is dangerous due to the increased risks for the development of the antibiotic resistance to those groups of antibiotics. Use of dispersible forms is one of the key point of the strategies to overcome the antibiotic resistance. The most important features of dispersible forms of antibiotics are prevented destruction in the stomach and maximal absorption in the upper parts of small intestine. It allows to increase the bioavailability of the drug and to minimize the impact on the intestinal microbiome, which reduces the incidence of common adverse reactions from the gastrointestinal tract. According to literature, oral administration of dispersible forms of drugs allows to reach the plasma concentrations similar to those in parenteral administration.

Optimization of migraine attacks relief

On December 24, 2022, in Moscow an interdisciplinary Council of Headache Experts, held under the auspice of the interregional public organization “Russian Society for the Study of Headache”, discussed the key problems of effective treatment of a migraine attack and the possibilities of a specific drug Kaporiza® (rizatriptan). Despite the development of strategies for the relief of migraine attacks and the effectiveness of triptans as first-line therapy, the choice of a specific drug in accordance with the individual clinical profile of the patient is difficult due to the existence of drugs in various forms (standard tablets, oral dispersible forms, injections, nasal sprays, rectal suppositories). Rizatriptan in the form of an orally dispersible tablet (ODT) has a number of advantages: high bioavailability, fast onset of action, and ease of use. Therefore, Kaporiza® (rizatriptan ODT) may be recommended as a priority therapy for all migraine patients who prefer the dispersible tablet form and who experience symptoms of nausea and vomiting, as well as for patients who have experience of poor efficacy and/or poor tolerability of other triptans. The Expert Council recommends to include rizatriptan ODT in the next edition of the clinical guidelines for the diagnosis and treatment of migraine as a first-line agent with Level A evidence.

STUDY OF THE EFFECT OF PRECURSORS ON THE STRUCTURAL CHARACTERISTICS OF SYNTHETIZED ZnO NANOPARTICLES

In this work, zinc oxide (ZnO) nanoparticles were obtained by direct precipitation method in aqueous solution using two different precursors — zinc acetate dihydrate and zinc chloride — under the same synthesis conditions. The effect of the selected precursors on the structural parameters of each synthesized sample was evaluated using X-ray diffraction (XRD) analysis. The results of the analysis demonstrate the synthesized ZnO phase with a hexagonal wurtzite structure and the average crystallite size of 28 nm for both studied samples. Based on the XRD data, the interplanar spacing, crystallite size, dislocation density, and micro strain were determined for different crystallographic planes. Analysis of the obtained values shows slight differences in the formed crystalline materials depending on the used precursor. The calculated structural parameters of the synthesized ZnO nanoparticles are in good agreement with the standard reported data (JCPDS 36-1451). The effect of selected precursors on the lattice constants, unit cell volume, Zn–O bond length, and crystallinity of synthesized ZnO samples was studied. It was established that the sample obtained from the zinc acetate dihydrate precursor is characterized by the absence of impurities and higher crystallinity (93%) compared to the sample synthesized from zinc chloride, the crystallinity of which is 86%. The results are of practical value for simple synthesis of nano dispersed forms of ZnO and its possible application in textile finishing.

Frequency-Selective Surface Based on Negative-Group-Delay Bismuth–Mica Medium

Negative group delay may be observed in dispersive media with anomalous dispersion in a certain frequency range. The fact that an outgoing wave packet precedes an incoming one does not violate the causality principle but is only a consequence of a waveform reshaping. This effect is observed in media such as photonic crystals, hyperbolic and epsilon-near-zero metamaterials, undersized waveguides, subwavelength apertures, side-by-side prisms, and resonant circuits at various frequencies. The current work is devoted to the design of a simple negative-group-delay medium with tunable properties in the THz frequency range. This medium consists of a bismuth-based frequency-selective surface on a dielectric substrate and may be tuned both statically and dynamically. While a geometry variation defines a main form of an effective permittivity dispersion and group delay/group velocity spectra, an external voltage allows one to adjust them with high precision. For the configuration proposed in this work, all frequency regions with noticeable change in group delay/group velocity lie within atmospheric transparency windows, which are to be used in 6G communications. This medium may be applied to THz photonics for a tunable phase-shift compensation, dispersion management in systems of THz signal modulation, and for encoding in next-generation wireless communication systems.

Repertoires of sanctuary: building a network of safety at the French–Italian border

ABSTRACT Sanctuary cities have experienced a strong political and theoretical revival in the last decade. However, the focus on cities and their policies restricts the idea of sanctuary to its urban, legal and – to a certain extent – North American enactments, leaving dispersed and rural forms of sanctuary understudied. In this paper, I examine the sanctuary spaces and practices in the Roya Valley, at the border between Italy and France, and more particularly the journey of its most well-known activist, the farmer Cédric Herrou. Although Herrou’s first actions could be best described as humanitarian and hospitable help towards migrants, they gradually evolved into more structured solidarity actions. These led to a decision by the Constitutional Council that strengthened the French constitutional value of fraternity to better distinguish disinterested support from human smuggling motivated by profit. I argue that these three concepts of fraternity, hospitality and solidarity identify different repertoires of sanctuary that respectively fulfil functions of signalling, protecting and community-building. These different functions, when articulated together, constitute a sanctuary or network of safety. By reconstructing this series of practices and justifications, I aim to clarify the conceptual vocabulary and normative appeal of sanctuary.

Combined Steam and CO2 Reforming of Methane over Ni-Based CeO2-MgO Catalysts: Impacts of Preparation Mode and Pd Addition

The sol–gel template technique makes it possible to synthesize a stable and efficient nickel catalyst based on magnesium-modified cerium oxide Ce0.5Mg0.5O1.5 for the combined steam and CO2 reforming of methane. To stabilize dispersed forms of the active component in the matrix of the support, the catalysts were synthesized by changing the support precursor (cerium acetate and chloride), the active component composition (Ni, NiPd) and the method of introducing nanoparticles. The relationship was established between the physicochemical and catalytic characteristics of the samples. The use of cerium acetate as a support precursor provided smaller pore and crystallite sizes of the support, a stabilization of the dispersed forms of the active component, and excellent catalytic characteristics. The introduction of Pd into the Ni nanoparticles (Pd/Ni = 0.03) increased the resistance of the active component to sintering during the reaction, ensuring stable operation for 25 h of operation. The increased stability was due to a higher concentration of defective oxygen, a higher dispersion of bimetallic NiPd nanoparticles, and the Ni clusters strongly interacting with the NiO-MgO solid solution. An efficient and stable Ni0.194Pd0.006Ce0.4Mg0.4O1.4 catalyst for the conversion of CO2 into important chemicals was developed. With the optimal composition and synthesis conditions of the catalyst, the yield of the target products was more than 75%.

The influence of explicit local dynamics on range expansions driven by long-range dispersal.

Range expansions are common in natural populations. They can take such forms as an invasive species spreading into a new habitat or a virus spreading from host to host during a pandemic. When the expanding species is capable of dispersing offspring over long distances, population growth is driven by rare but consequential long-range dispersal events that seed satellite colonies far from the densely occupied core of the population. These satellites accelerate growth by accessing unoccupied territory, and also act as reservoirs for maintaining neutral genetic variation present in the originating population, which would ordinarily be lost to drift. Prior theoretical studies of dispersal-driven expansions have shown that the sequential establishment of satellites causes initial genetic diversity to be either lost or maintained to a level determined by the breadth of the distribution of dispersal distances. If the tail of the distribution falls off faster than a critical threshold, diversity is steadily eroded over time; by contrast, broader distributions with a slower falloff allow some initial diversity to be maintained for arbitrarily long times. However, these studies used lattice-based models and assumed an instantaneous saturation of the local carrying capacity after the arrival of a founder. Real-world populations expand in continuous space with complex local dynamics, which potentially allow multiple pioneers to arrive and establish within the same local region. Here, we evaluate the impact of local dynamics on the population growth and the evolution of neutral diversity using a computational model of range expansions with long-range dispersal in continuous space, with explicit local dynamics that can be controlled by altering the mix of local and long-range dispersal events. We found that many qualitative features of population growth and neutral genetic diversity observed in lattice-based models are preserved under more complex local dynamics, but quantitative aspects such as the rate of population growth, the level of maintained diversity, and the rate of decay of diversity all depend strongly on the local dynamics. Besides identifying situations in which modeling the explicit local population dynamics becomes necessary to understand the population structure of jump-driven range expansions, our results show that local dynamics affects different features of the population in distinct ways, and can be more or less consequential depending on the degree and form of long-range dispersal as well as the scale at which the population structure is measured.

The using of data on the moult progress in the study of migration periods of the annual cycle of passerines

Using trapping and ringing of birds for studying the ecology and the demographic parameters of populations is necessary to determine as accurately as possible in which period of the annual cycle each individual was caught. The first-year passerine birds undergo juvenile migration (usually in form of postfledging dispersal) and postmoulting (autumn) migration in summer-autumn period. These stages of annual cycle are difficult to identify in trapping birds by calendar dates because the timing of migration seasons can significantly overlap in the same location. The study of moult at the Ladoga Ornithological Station made it possible to determine the states of plumage that mark juvenile and postmoulting migrations in first-year birds. The article presents two examples of the use of moult progress in the study of bird migrations. The first one is an analysis of the ratio of the terms of departure and passage in three long-distant and three short-distant migrants of passerines. It has been shown that the timing of the departure of local birds is earlier than the timing of the passage of other populations in all studied species, while the last local individuals in long-distance migrants are recorded long before the end of the passage of the species, and in short-distance migrants they can be found until its end. As another example, an analysis of long-term trends in the timing of summer-autumn movements in the Garden Warbler was performed. It is shown that for almost a fifty-year observation period, neither the timing of juvenile migration nor the timing of postmoulting migration of first-year birds has changed. At the same time, the timing of the spring passage of the species shifted to earlier. As a result, the duration of stay of the Garden Warbler in the Ladoga region has increased.