Rates Of Growth Processes Research Articles

НЕКОТОРЫЕ АСПЕКТЫ СОЗДАНИЯ ОЗДОРОВЛЕНЫХ КОЛЛЕКЦИЙ ВИНОГРАДА АБОРИГЕННЫХ ДОНСКИХ СОРТОВ В КУЛЬТУРЕ IN VITRO

The article discusses some aspects of improving the elements of technology for creating of healthy collection of indigenous grape varieties in vitro. To recover from phytoplasma infec-tion, a chemotherapy method using the antibi-otic Cefotaxime has been developed. At high concentrations of the antibiotic, intoxication of plants and deterioration in their quality charac-teristics were noted. Plants of Makhrovatchik variety showed an improvement in survival rate at antibiotic concentrations of 100 and 200 mg/l: 64.3 and 60.7%, respectively. For long-term cultivation without replantings, the effectiveness of slowing down growth process-es by increasing the density of the nutrient me-dium was studied. The study was carried out on the varieties Makhrovatchik, Tsimlyansky Sergienko. Studied concentrations of agar-agar were (6, 8, 10, 12, 13 and 15 g/l). A decrease in the rate of growth processes was noted in all studied varieties, but the rate of the decrease was different.

СТИМУЛЯЦИЯ РОСТОВЫХ ПРОЦЕССОВ У РАСТЕНИЙ КУЛЬТУРЫ БАКЛАЖАН, ВЫРАЩИВАЕМЫХ В УСЛОВИЯХ ХАБАРОВСКОГО КРАЯ

The article presents the results of studies for 2019. The aim of the study was to identify the effectiveness of growth regulators Prorotok and HB-101 in stimulating growth processes in seeds and seedlings of eggplant culture grown in the Khabarovsk Territory. The objectives of the study were to study the growth-stimulating effect of the studied drugs based on the analysis of data on the energy of germination and germination of seeds, as well as morphological parameters of seedlings of the eggplant culture grown in the territory of the village. Dzhonka of the Nanay district of the Khabarovsk Territory. The research was carried out on two varieties of eggplant Boyarin F1 and Mishutka. The experiment was carried out in three replicates in accordance with the agricultural technology generally accepted for the territory of the Khabarovsk Territory. As a result of the studies carried out, inhibition of growth processes was revealed in the variants of the experiment with pre-sowing seed treatment with Prorostk and HB-101 in the form of soaking them for two hours in working solutions of preparations with a concentration of 0.25, 0.5, 1% compared to the control a variant in which the seeds were soaked in water. Analysis of the morphological parameters of eggplant seedlings revealed the following. In the variants of the experiment with the concentration of the Prorostka working solution of 0.25%, the plants of varieties Mishutka and Boyarin F1 showed an increase in the length of the leaf blade by 8 and 13%, the length of the stem by 7 and 17%, respectively, compared with the control. In the variants of the experiment, in which the plants were treated with the Germination solution with a concentration of 0.5%, a significant increase in the length of the leaf blade by 6 and 11%, and the length of the stem by 8 and 15%, respectively, was revealed. The analysis of the efficiency of HB-101 showed a growth-stimulating effect at the stage from seed germination to the formation of the first two true leaves in plants of the Mishutka variety in the variant with a working solution concentration of 0.25%. The increase in the length of the leaf in this case was up to 35%, the length of the stem up to 20% in comparison with the control variant. In the period from two true leaves to planting seedlings in open ground, a high rate of growth processes was noted in variants with working solutions HB-101 0.25 and 0.5%. The use of the HB-101 preparation at the stage of presowing treatment, as well as during the cultivation of seedlings of plants of the Boyarin F1 variety, is not advisable, since a decrease in the rate of growth processes was revealed in the plantings of this variety in comparison with the control option.

Preservation of the gene pool of plants under permafrost conditions: State, advantages, and prospects

The effect of long-term storage of seeds of three leguminous species (Pisum sativum, Lens culinaris, and Cicer arietinum) on physiological (germination rate) and cytological (mitotic index) parameters of the seeds and seedlings derived therefrom has been studied. It has been found that, after nearly 35 years of storage in permafrost (temperature from −5.5 to −6.0°C) without replanting, the germination of seeds of varieties of the species studied remains at the same or a slightly lower level than in reference samples (seeds of the same varieties harvested in 2007–2009), without a significant difference in root growth rate. The observed number of chromosomal aberrations in root meristem cells does not increase except for in the case of P. sativum cv. Latores and L. culinaris cv. k-2330, and in these cases neither the laboratory germination rate nor the rates of growth processes decrease. Thus, long-term storage of seeds under permafrost conditions favors the preservation of their viability (germination ability) and can be suggested as a promising method of seed storage.

EFFECT OF MOTHER’S PATHOLOGIC GESTATION COURSE ON PHYSICAL DEVELOPMENT OF CHILDREN AT BIRTH, AT AGE 1 YEAR AND 7-8 YEARS

The study retrospectively investigated the percolation characteristics of the perinatal period and during the first year of study at school - especially physical development of 919 first-formers from 17 schools in the city of Kirov. It has been established that the perinatal period pathology exerted different influence on the components of physical development of the children. Late preeclampsia in the history had no effect on anthropometric indices at birth and at the age 1 year, but reduced them at the age 7-8 years. Anemia and placental insufficiency in anamnesis influenced the anthropometric parameters at birth, but was not manifested at the age 1 year and 7-8 years. The value of the circumference of the chest and the Rohrer index, the value of vital capacity, speed of growth processes and harmonious physical development were most vulnerable to the pathologies of the perinatal period and continued up to the age 7-8 years. Among the studied pathologies, late gestosis (reduced anthropometric parameters and affects on the cardiovascular system) and fetoplacental insufficiency (reduced rate of growth processes and harmonious physical development) exerted the most negative influence at the age 7-8 years.

REGULATION OF GROWTH PROCESSES DURING THE CELL CYCLE OF THE CHLOROCOCCAL ALGA SCENEDESMUS QUADRICAUDA UNDER A DNA REPLICATION BLOCK

ABSTRACT The kinetics of two growth parameters (total RNA and total protein accumulation) was followed in synchronized cultures of the chlorococcal alga Scenedesmus quadricauda (Turp.) Bréb. under conditions of inhibited DNA replication in the presence of 5‐fluorodeoxyuridine (25 mg.L‐1). In the control culture, growth processes occurred in several steps with a decreasing rate of accumulation of RNA and protein amount approximately at each doubled value of the preceding step. Oscillations in the rate of growth processes in the control culture were temporally related to the initiation of individual reproductive steps. At each doubling, the cell became committed to triggering a sequence of reproductive processes, starting with DNA replication and ending with protoplast fission. Three commitment points were attained in the control culture and, consequently, three replication rounds of DNA followed by three nuclear divisions and three protoplast fissions occurred during one cell cycle. If 5‐fluorodeoxyuridine (FdUrd) was added at the beginning of the cell cycle, no reproductive processes occurred, and the cells remained uninuclear with one genome and did not divide. RNA accumulation did not seem to be affected by the presence of FdUrd for at least one cell cycle, and three or four doublings in the amount of RNA occurred during this period. Protein accumulation was even more independent of reproductive processes in the cell and continued for a period of about two or three cell cycles, attaining six doublings at the end of this period. Therefore, oscillations in the rate of protein or RNA accumulation remained even if reproductive processes were inhibited.

Universal finite-size effects in the rate of growth processes

Kinetic roughening of the growing surface generates universal finite-size corrections in the growth rate of films and crystals. For thin films the correction scales with the film thickness h as h- alpha perpendicular to ; for thick films it scales with the substrate size L as L- alpha //, where a/sub ///=2(1- zeta ) and alpha perpendicular to =2(1- zeta )/z in terms of the kinetic roughening exponents zeta and z. For ballistic deposits this implies a similar correction in the density. The coefficient of the correction is proportional to the KPZ coupling constant lambda . For one-dimensional substrates alpha /sub ///=1 and alpha perpendicular to =2/3. These predictions are corroborated by computer simulations of growth and deposition on one- and two-dimensional substrates, and by exact results for one-dimensional models. Different exponents apply in the weak results for one-dimensional models. Different exponents apply in the weak coupling regime and at kinetic roughening transitions.