МАТЕМАТИКА И ЕСТЕСТВЕННЫЕ НАУКИ

The fauna and ecology of bumblebees in the European North are quite well-studied. However, there is a scarcity of information about the distribution and ecology of certain species of bumblebees, especially for the territory of Northern Russia. In this study, we summarised materials concerning Bombus (Pyrobombus) jonellus (Kirby, 1802), which is typical bumblebee species for the north-western portion of the Russian Plain and surrounding areas. The studied territory includes the Arkhangelsk Region and the western part of the Nenets Autonomous District, i.e. a wide strip from taiga to tundra ecosystems. Due to the studies of materials that were collected over a period 17 years, we established that B. jonellus is widely distributed and the northern border of its range within the studied region reaches the northern part of the Kanin Peninsula. In the north-western Russian Plain, B. jonellus has been found in various types of habitats, the most common being coniferous and birch forests, secondary meadows and ruderal patches. In the Solovetsky Islands, White Sea, Russia, B. jonellus is typical on coastal heathlands. In the northern part of the studied region, B. jonellus has a tendency to forage in open habitats and visits a wide range of entomophilous plants, mostly of the family Ericaceae. Our findings highlight that the territory of the north-western Russian Plain and surrounding areas is where B. jonellus is widely distributed and abundant, being recorded in different types of habitats.

Blood chemistry values are reported for the bearded seal species (Erignathus barbatus barbatus Erxleben, 1777) from the White Sea. 27 blood plasma indices are used to describe the state of the metabolism of proteins, carbohydrates, lipids, minerals (total protein, albumin, α-, β-, γ-globulins, urea, creatinine, uric acid, glucose, lactic acid, total lipids, triglycerides, cholesterol, calcium, phosphorus, sodium, potassium, magnesium, iron, copper, chlorides, aspartate aminotransferase, alanine aminotransferase, γ-glutamyl transferase, creatine kinase, alkaline phosphatase, lactate dehydrogenase) in 3-, 5- and 10-year-old seals. The values of the studied parameters are similar to published data for bearded seal populations in other Arctic regions, as well as being in close agreement with indicators of other pinniped species of the same age. The plasma content of total protein, albumin, α-, β-, γ-globulins, urea, uric acid, total lipids, calcium, magnesium, sodium, and chlorides is invariable in animals of the studied ages. In common with other pinnipeds and land-based mammals, age-related changes in metabolic rates in the studied animal groups are most pronounced in the activity level of key metabolism enzymes. While aspartate aminotransferase, alanine aminotransferase and γ-glutamyl transferase activity is higher in adult seals than in immature animals, alkaline phosphatase, creatine kinase and lactate dehydrogenase activity is lower. Changes in biochemical parameters of bearded seal blood at the ages of 3, 5 and 10 years indicate a catabolic orientation in metabolism at all studied development stages. Although more research is needed to investigate the biological significance of a number of blood indices, the data presented in this study provide initial baseline blood chemistry parameters for use in assessing the condition of individual seals, as well as informing monitoring and management efforts for wild seal populations.

A nuclear facility in Iran before and after an explosion, a village in Pakistan before and after a drone attack, a Cambodian river valley before and after a flood. The before-and-after image has become the tool of choice for analysing events. Satellite photography allows us to scrutinise the impact of war or climate change, from the safe distance of orbit. But one thing is rarely captured: the event itself. All we can read is its effect on a space, and that's where the architectural expert is required, to fill the gap with a narrative. In this groundbreaking essay, Eyal and Ines Weizman explore the history of the before-and-after image, from its origins in 19th-century Paris to today's satellite surveillance. State militaries monitor us and humanitarian organisations monitor them. But who can see in higher resolution? Who controls the size of the pixels? Interpreting these images is never straightforward.

In this paper, the maximum likelihood and the Bayes estimators under symmetric and asymmetric loss functions are derived for sample from the Kumaraswamy distribution in the presence of outliers, using Newton-Raphson method and Lindley's approximation (L-approximation). These estimators are compared empirically using Monte Carlo simulation, when all the parameters are unknown.

In this paper, we obtain Bayesian and non-Bayesian estimators for the scale parameter, reliability and failure rate functions of the Rayleigh distribution in the cases of progressively type II censored samples. The Bayes estimators are obtained using symmetric and asymmetric loss functions. Comparisons are made between these estimators using Monte Carlo simulation study..

В статье описана информационная система (http://botany-collection.bio.msu.ru), объединяющая данные по трем коллекциям (палинологической, карпологической и коллекции по анатомии древесины), созданным на кафедре высших растений биологического факультета МГУ за последние 70 лет. Цифровая база данных включает изображения объектов и их краткие морфологические описания. Система имеет общий интерактивный каталог всех введенных в систему образцов с функцией поиска по названиям видов, родов, семейств и жизненным формам. Кроме того, каждая коллекция имеет отдельный каталог образцов с функциями поиска по различным параметрам в зависимости от особенностей материала. Полные каталоги всех коллекций размещены на сайте в виде файлов Exсel.

Пособие предназначено для занятий по курсу профессионально- ориентированного английского языка в области биотехнологий. Содержит практические задания, тексты для домашнего чтения и глоссарий. Направлено на формирование умений и навыков чтения научно-технических текстов по специальности с целью извлечения нужной информации, аннотирования и реферирования изучаемой литературы, а также развития навыков устной речи по данной специальности.