Adenylate Nucleotides and 2,3-Biphosphoglycerate Concentration in Erythrocytes of Growing Wielkopolska Stallions

The aim of this study was to examine the relationships between the concentrations of adenylate nucleotides (ATP, ADP, AMP), total nucleotide pool (TAN), adenylate energy charge (AEC) and 2,3-biphosphoglycerate (2,3-BPG) in the erythrocytes of young horses in the period of their rapid growth and development. The studies were conducted on 10 young Wielkopolska breed stallions for two years; Group A: 1-month-old, Group B: 3-month-old, Group C: 6-month-old, Group D: 1-year-old, and Group E: 2-year-old. ATP, ADP and AMP concentrations in the erythrocytes were determined by HPLC. 2,3-BPG was determined using the Calbiochem USA kit. We observed that erythrocyte ATP, ADP, AMP and TAN concentrations significantly decreased with age (p p < 0.05). A significant correlation was also found between ATP concentration and AEC values (except 12 month-old stallions). Moreover, an age-dependent negative correlation between ATP and 2,3-BPG (r = -0.81) was found. The conclusion is that the adenylate energy charge and erythrocyte 2,3-BPG variables in the Wielkopolska stallions mainly depend on age, thus warranting the use of specific age-related reference values for this breed's foals

Транссиб: путешествие во времени

[For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version)].ABSTRACT The Organization for Cooperation between Railways (OSJD) in every possible way promotes the exchange of experience and study tours for representatives of participating countries and affiliated enterprises. Broad international contacts allow developing mutual understanding, strengthening business ties, transferring knowledge, maintaining historical continuity in the field of railway traffic. At the end of July last year a group of Polish railway workers returned from the Trans-Siberian Railway journey. Judging by the published notes, they had the opportunity to satisfy not only professional interest, but also got acquainted with the history of the Trans-Baikal Territory, the past of the Buryat and Mongolian people. The modern locomotive, unwillingly, became a «time machine» for travelers. Keywords: Trans-Siberian Railway, TransSib, Trans-Baikal, retrospective, OSJD.Текст аннотации на англ. языке и полный текст статьи на англ. языке находится в прилагаемом файле ПДФ (англ. версия следует после русской версии).Организация сотрудничества железных дорог (ОСЖД) всячески содействует популяризации обмена опытом и ознакомительных поездок для представителей стран-участниц и присоединённых предприятий. Широкие международные контакты позволяют развивать взаимопонимание, укреплять деловые связи, передавать знания, блюсти историческую преемственность в сфере железнодорожных сообщений. В конце июля минувшего года из поездки по Транссибу возвратилась группа польских железнодорожников. Судя по публикуемым заметкам, они имели возможность удовлетворить не только профессиональный интерес, но и познакомились с историей Забайкальского края, прошлым бурятского и монгольского народов. Современный локомотив поневоле стал для путешественников «машиной времени»

Effect of competition on diameter growth of European beech (Fagus sylvatica L.) and Scots pine (Pinus sylvestris L.) in two-storeyed beech-pine stands

The studies were based on the empirical material collected from 88 sample plots located in 78 beech−pine stands and 10 pine stands with beech undergrowth. The effect of the competition of beech trees from the understorey and pine trees on the radial increment (Δr) and basal area increment (Δg) was investigated. The strength of the competition was determined using distance−independent indices, which did not take into account the position of a tree in the stand. The effect of the competition on the basal area growth of both beech and pine trees was found to be greater than on the radial growth

Procent miąższości kory w drzewostanach buka karpackiego

The paper provides results from the study on calculating the percent bark volume for two beech stands from Stuposiany and from Dynów and Sucha−Beskidzka Forest Districts. The percent bark volume can be best determined using a percent bark thickness method. The percent bark volume of stands from Dynów and Sucha−Beskidzka can be also determined on the basis of their mean dbh, height, age or volume while PVk of stands in Stuposiany can be determined only on the basis of percent bark thickness, the remaining characteristics do not ensure the desired accuracy

Model of the percentage of the stem section volume in the total stem volume for the mountain and lowland beech

The paper presents research results concerning the development of equations being the model of the share of the stem section volume in the total stem volume. The equations were developed separately for the mountain and lowland beech. The equations were the basis to construct the model of stem longitudinal section and then to calculate the volume of any section of the stem

Analysis of height growth phases for beech growing in the lower storey of beech-pine stands

The study focused primarily on the analysis of the periodic annual and mean annual increment and on the recognition of the growth phases for beech growing in the lower storey of beech−pine stands. The empirical material collected from 12 beech−pine stands located in the territory of the Miłomłyn and Stare Jabłonki Forest Districts was used for the study. The height increment of the beech trees from the second storey of beech−pine stands under study culminated earlier than the height increment of the beech trees from pure, one−storied stands. The beech trees growing in the second storey are also characterised by a shorter juvenile phase

Height growth model for shelterwood regeneration of beech

The studies were based on the empirical material collected in 23 stands located in the territory of the Miłomłyn, Stare Jabłonki and Kudypy forest districts. Height growth model for beech was developed on the basis of measurements of 115 trees growing in the regeneration layer in pine stands. The developed function can be useful, inter alia, for building a 'network of site indices' for shelterwood regeneration. The studies on the height growth rate allow estimating the age at which undergrowth reaches the lower layer of a stand

Empirical equations for determination dbh form factors for the lowland beech stands

The paper presents the results of studies, which have led to the development of empirical equations for determining various kinds of dbh form factors. The studies concerned beech stands growing in the north of Poland. Dbh form factors for stand can be determined using the said equations on the basis of the average dbh or average stand height. The same set of empirical equations was also developed to determine form factors for trees

Breast height diameter growth model for European beech (Fagus sylvatica L.) growing in the understorey of the beech-pine stand

The study was based on the empirical material collected from 78 beech−pine stands located in the territory of the Miłomłyn (46 plots) and Stare Jabłonki (32 plots) Forest Districts. On the basis of the collected material, a breast height diameter growth model has been developed for the beech growing in the understorey of pine−beech stands. The developed function is an integral part of the growth model for mixed beech−pine stands