Izvestiya of Saratov University.
ISSN 1816-9775 (Print)
ISSN 2541-8971 (Online)


Биология

Сравнительная характеристика записывающих устройств для вибрационных сигналов на примере Heterocerus fenestratus (Thunberg, 1784) (Coleoptera: Heteroceridae)

В русскоязычной литературе достаточно широко известны работы по вибрационной коммуникации для Orthoptera и Hemiptera. В основном для записи данной коммуникации используют пьезоэлектрический адаптер ГЗК-661 или электромагнитный преобразователь ГЗМ-105. Использование данных устройств не дают удовлетворительных результатов при записи насекомых меньше 1 см.

THE FORMATION OF "PATERNAL-CHILDISH" LINKS AMONG SAIGA

The authors analyzes the formation of «Paternal-childish» links among Saigas. In this woks the author describes the first female saiga licking her half-born calf. As a result, due to licking establishes contact and enhance the ties between mother and newborn calf. The author concludes that female saiga could be attributed to the active mother type as well as female eland antelope.

THE COMPARATIVE CHARACTERISTIC OF ANTIBACTERIAL ACTIVITY OF SELENOORGANIC COMPOUNDS ON CLINICAL STRAINS OF STAPHYLOCOCCUS AUREUS

Antibacterial activity of diacetophenonylselinide (a compound 1) and its nitroderivative (a compound 2) on ten clinical strains of Staphylococcus aureus is studied. Much higher antibacterial activity of the compound 2 which in concentration of 0,01 mg/ml at various time of influence causes destruction of 10,6-69,2 % of bacterial cells in comparison with the control is found out.

FREQUENCY OF APOMIXIS BEI SOME ARTEMISIA SPECIES FROM SARATOV REGION (ASTERACEAE)

We have studied the characteristics of seed reproduction Artemisia 14 species from various parts of the Saratov region. It is shown that a population of five of them (A. vulgaris, A. salsaloides, A. dracunculus, A. glauca, A. austriaca) are characterized by high (at least 20-30%) frequency of gametophytic apomixis in plants, and three species (A. abrotanum, A. absinthium, A. armenica) have lower (10-15%) frequency of gametophytic apomixis.

ANALYSIS OF STRESS-INDUCED CHANGES IN THE DYNAMICS OF BLOOD PRESSURE IN WHITE RATS ON THE BASIS OF MULTIFRACTAL CONCEPT

We revealed that females compared with males demonstrated more favorable pattern of cardiovascular responses to stress. Actually, in females the chronotropic effects of stress were more pronounced, while the pressor effects were weakened compared with males. Hemodynamic parameters in females returned to normal more rapidly than in males. In addition to physiological characteristics, applications of multifractal analysis allowed us to reveal both, individual and gender distinctions in the stress-induced reactions of the cardiovascular system.

CYTOLOGICAL MECHANISMS OF THE CELLS NUMBER REDUCTION IN EMBRYO SACS OF THE TOBACCO MUTANT

Megaspore- and megagametophytogenesis in tobacco mutant with reduced cells number in embryo sacs were studied. It is established, that the mutation causes a disturbance of one pair of homologous chromosomes conjugation in meiosis. Consequently alongside with the haploid (24-chromosomal) spores aneuploid (23-chromosomal) spores forms which are developed into abnormal embryo sacs. At cenocyte stage of megagametophytes development falling out of 1-2 mitoses and/or their abnormal course were observed, as well as abnormalities in embryo sacs polarization.

REGIONAL INTEGRATION DATA BASE AS A FOUNDATION OF MONITORING AND RESERVATION RARE PLANT SPECIES IN SARATOV PROVINCE

The data base of condition rare plants species in Saratov province has been composed for the first time for region. The structure of base and patterns of presenting data in various levels are considered. Keywords: DATA BASE, RARE SPECIES OF PLANTS, MONITORING, SARATOV PROVINCE

ВЛИЯНИЕ ЗАСОЛЕНИЯ НА МОРФОГЕНЕЗ ПРОРОСТКОВ ИНТРОГРЕССИВНЫХ ЛИНИЙ МЯГКОЙ ПШЕНИЦЫ С ГЕНЕТИЧЕСКИМ МАТЕРИАЛОМ AEGILOPS COLUMNARIS

Внесение генетического материала дикорастущих видов в геном культурных растений позволяет существенно расширить разнообразие селекционного материала. Для эффективного использования интрогрессивных растений необходимо изучение их хозяйственно-ценных признаков и адаптационных возможностей. Цель работы – изучение влияния двух типов засоления на морфогенез проростков интрогрессивных линий мягкой пшеницы, содержащих генетический материал Аegilops columnaris Zhuk.

Samples of Thymus (Lamiaceae) from the central part of the Russian Caucasus, stored in the Herbarium of the Institute of Ecology of the Volga river basin of the Russian Academy of Science (PVB)

As a result of the revision of herbarium samples of Thymus (Lamiaceae) collected in the central part of the Russian Caucasus (Kabardino-Balkarian Republic, Karachay-Cherkess Republic, Republic of North Ossetia-Alania, Stavropol Territory) and transferred to the Herbarium of the Institute of Ecology of the Volga river basin of the Russian Academy of Sciences (PVB), 17 species of the genus Thymus were identifi ed: T. buschianus Klokov et Des.-Shost., T. caucasicus Willd. ex Ronniger, T. daghestanicus Klokov et Des.-Shost., T. elisabethae Klokov et Des.-Shost., T.

Optimization of the technique for maize protoplast isolation and their nativity after electroporation

We optimizes the composition and concentration of the enzymes, the time for enzymatic treatment and the volume of the enzyme mixture. We also optimized the concentration osmotic of agent, the centrifugation mode, and fi lter pore size for protoplasts isolating from epidermal cells of maize roots (Zea mays L.) of the Brown Marker (BM) line. It was found that 150 minutes is the optimal time for 150 mg root tissue maceration.

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