Биология

In 1949 S. S. Khokhlov (one of the founders of the Russian scientifi c school on the problem of apomixes) proved the original conception of the progressive evolutionary role of apomixis. He contended that the basic direction of the reproductive system evolution in angiosperms is a gradual failure of sex reproduction and transition to apomixis. This hypothesis was heavily criticized and called a “scientist’s fantasy”.

Data on the study of morphometric parameters of medicinal plants such as Hyssopus offi cinalis L. and Nepeta pannonica L., which are part of the collection of medicinal plants of the Botanical Garden of the Orеnburg State University, are presented. It was found that the studied species successfully adapt to new growing conditions, since the parameters of morphometry vary within the medium to very high levels of variability. However, Nepeta pannonica L.

In the conditions of the Moscow region, 10 samples of representatives of the genus Allium L. were studied, including: A. altaicum Pall., A. fi stulosum L., A. galanthum Kar. & Kir., A. oschaninii O. Fedtsch., A. pskemense B. Fedtsch from the section Cepa (Mill.) Prokh.; A. altyncolicum N. Friesen, A. ledebourianumSchult. & Schult. f., A. oliganthum Kar. & Kir., A. schoenoprasum L. from the section Schoenoprasum Dum.; A. komarovianum Vved. from the section Sacculiferum P. P. Gritz.

A large number of synthetic pesticides have been developed to combat phytopathogenic bacteria and fungi, but their use is economically unprofi table and harms the environment. The aim of this study was to evaluate the antagonistic properties of Bacillus velezensis HR13 bacteria in relation to cultures of phytopathogenic bacteria and fungi, as well as the ability to produce cyclic lipopeptides, which have antimicrobial activity. It is shown that strain B.

The formation of the elemental composition of plants is a dynamic process, which is aff ected by a large number of concurrent genetic and environmental factors, and their signifi cance varies according to the conditions and the state of the environment. The goal of the work was to study the characteristics of the accumulation of 8 chemical elements in Scots pine wood under the infl uence of seasonal and ecological variability.

Antimicrobial phototherapy is an alternative method for combating clinically signifi cant microorganisms associated with lesions of the skin, mucous membranes of the oral cavity, respiratory, gastrointestinal and urogenital tracts. The method uses non-toxic dyes called photosensitizers, molecules that can be excited by harmless visible light to form reactive oxygen species.

Проанализированы рост и развитие междоузлий на примере сорта Саратовская 36. Среди сортов яровой мягкой пшеницы саратовской селекции установлены различия по абсолютной и относительной длине междоузлий.

Важную роль при устранении токсического действия тяжелых металлов на растения играют почвенные микроорганизмы. Известно, что ризосферные ассоциативные микроорганизмы рода Azospirillum активно взаимодействуют с растениями и могут оказывать различные воздействия на их морфологические и биохимические параметры.

Coming to the Earth a flux of solar radiation is calculated using of modern numerical methods of celestial mechanics over a time interval of about 6000 years with the sampling interval of one year. The luminosity of the Sun was assumed constant. In the power spectrum of the insolation time series detected harmonic of the synodic period of the Mars, as well as harmonics of the combination frequencies of synodic periods of the planets Venus, Jupiter and Saturn, and the frequency corresponding to the sidereal year.