Exploring the use of the perceived stress scale for children as an instrument for measuring stress among children and adolescents: a scoping review.

This review examines the application and findings related to the Perceived Stress Scale for Children (PSS-C) since its development by B. White in 2014. The PSS-C is designed to assess children's perceived stress, focusing on their subjective experience rather than objective stressors.

Playing Online as Preparation for Mathematics: The Cultural-Historical Approach as an Alternative to Constructivism.

Background: While the traditional method of teaching consists of repetition and memorization, the constructivist theory proposes independent discovery and free play. The cultural-historical approach, on the other hand, does not insist on the early introduction of formal mathematics as implicit or explicit knowledge. According to this outlook, important psychological developmental is necessary for the child before he/she can learn mathematics in primary school.

Corrigendum: The program for introduction of basic mathematical knowledge: the effects in six years old Mexican children.

[This corrects the article DOI: 10.3389/fpsyg.2023.

The program for introduction of basic mathematical knowledge: the effects in six years old Mexican children.

Introduction: The process of teaching and learning mathematics in primary school represents an obstacle for both teachers and pupils. According to the historical-cultural conception of development and education, the way how intellectual concepts are initially introduced may radically affect a student's success in learning. The historical-cultural conception of development, together with activity theory, may serve as the basis for creating a novel methodology for pedagogical work on mathematical concepts with pre-school and school children.

Effectiveness of Different Teaching Resources for Forming the Concept of Magnitude in Older Preschoolers with Varied Levels of Executive Functions.

Background: Studies have shown the great importance of early mathematical development as a predictor of subsequent success, which poses the question of how to organize preschool mathematical education with a view to the children's age characteristics, including their cognitive development. In other words, mathematical concepts and actions should be formed with the help of teaching resources appropriate to the child's development.

Objective: To determine the effectiveness of three teaching resources (examples, models, and symbols) in formation of the concept of magnitude in older preschoolers (ages 6-7) with different levels of executive function.

Adaptations of data mining methodologies: a systematic literature review.

The use of end-to-end data mining methodologies such as CRISP-DM, KDD process, and SEMMA has grown substantially over the past decade. However, little is known as to how these methodologies are used in practice. In particular, the question of whether data mining methodologies are used 'as-is' or adapted for specific purposes, has not been thoroughly investigated.

Modern epidemiology of hepatitis A in the north-western region of the Russian Federation.

The epidemiological features of hepatitis A virus (HAV) infection were studied in eleven territories located in the north-western region of the Russian Federation. The dynamics of HAV infection in Russia and in the region were evaluated during a 17-year period. The age-specific incidence was calculated and 229 305 patients with acute HAV were identified.

Hepatitis B in St Petersburg, Russia (1994-1999): incidence, prevalence and force of infection.

Hepatitis B (HB) is thought to be an expanding health problem in Russia. The incidence of infection was estimated from mandatorily reported HB cases in St Petersburg. The two-sided t-test for independent samples and the LOESS (locally-weighted regression) smoother were used to compare the age at infection for symptomatic, asymptomatic and chronic infections, by gender.

Shift in predominating subtype of HCV from 1b to 3a in St. Petersburg mediated by increase in injecting drug use.

The genotypes of 149 HCV strains from St. Petersburg were determined by limited sequencing and phylogenetic analysis within the NS5B region. One hundred two strains derived from patients that attended infectious disease clinics, of whom 48 admitted injecting drug use, and 47 derived from dialysis patients.

[Characteristics of the manifest and latent components of the hepatitis A epidemic process in cities of Russia].

Seroepidemiological study of hepatitis A (HA) morbidity was carried out in three Russian cities, with different levels of HA morbidity. The study included the analysis of HA morbidity for 22 years, the determination of antibodies to HA virus (anti-HAV) in 2,958 healthy persons aged 0-12 months to 40 years and older. In one of the cities 7 isolates of HA virus were obtained from unrelated sources and the genotypes of the virus were determined.

[Effect of immobilization on yeast metabolism].

Respiratory quotients and enzyme activity were determined in yeast cultures of Saccharomyces cerevisiae and Kluyveromyces sp., both suspended and immobilized on acrylonitrile fibers. Immobilization induced changes in the cell metabolism resulting in activation of the basic metabolic pathway of the given type of yeast cells.

[An evaluation of the quality of tetanus anatoxins by gel electrophoresis].

The study of tetanus toxoids obtained from different manufacturers in the USSR has shown that these preparations exhibit molecular heterogeneity. The method of gel filtration has made it possible to find out that tetanus toxoids from different manufacturers differ in the degree of their purification. The preparations produced by the manufacturing enterprises in Perm and Ufa have been found to contain considerably less ballast substances than the preparations produced in Moscow.

Experimental substantiation of allogenic tendon tissue transplantation.

Substantiation of transplantation of tendon allografts treated with a new solution showing both sterilizing and preservatory effects was provided in experiments on 84 dogs. The solution prepared on the basis of 0.1% formaldehyde with the addition of dimethyl sulphoxide, monomycin and prednisolone (FDMP) shows a high antimicrobial activity, preserves the structure of the tendons and their elasticity.

[Methods of sterilizing and preserving tendon transplants].

The authors describe three methods for making tendon transplants by using chemical sterilizing and preserving means having no unfavorable effect on their biological and plasty properties. The methods are simple, reliable and fairly suitable for a wide supply of clinical institutions with tendon transplants.