Fast development of mariculture in the world leads to increasing of the load on natural habitats, especially due to organic enrichment. There are a few investigations concerning the effect of ...additional organic loading on the Arctic benthic communities. The main goal of our research was to ascertain the impact of mussel farm on the benthic community in the White Sea and its following recovery after mussel farm removal. We performed annual observations from 1988 to 2011. During the mussel farm functioning, two stages of organic enrichment impact on community structure were recorded: in the first 2 years, diversity and proportion of deposit feeders increased but later all studied characteristics of the benthic community decreased significantly. After the mussel farm removal, the benthic community started to restore and we distinguished several stages of recovery succession. Native structure of benthic community began to recover 8 years after organic loading had ceased, when selective deposit feeding bivalves Portlandia arctica Gray appeared in the benthos. 4-6 years later it became the only dominating species in the studied benthic community. Therefore, in the White Sea, native structure recovery of the Arctic benthic community after the severe disturbance took about 15 years.
Results are provided for recording transitional processes in a turbogenerator obtained by means of a phase chronometric system. Experimental data are compared with results of mathematical ...modelling.PUBLICATION ABSTRACT
Transient recordings are considered for the shutdown of a turbine generator functioning under the conditions of a heat and electricity generating station. Photoelectric systems are used for precision ...chronometric recording (absolute error 1·10^sup -7^ sec) of the rotating shaft to provide for detecting effects not accessible to the standard equipment of power stations. It is proposed using this approach in computerized forecasting of turbine generator state.PUBLICATION ABSTRACT
The characteristics of callogenesis and regeneration during in vitro culturing of anthers of fruit and berry plants are revealed. The optimal culturing conditions are determined and the combinations ...of phytohormones in nutrient media providing a high percentage yield of calli and production of regenerant plants are found.
This review is the first one dealing specifically with a class of peroxisomal disorders that remain virtually unfamiliar to Russian medical genetic consultants and pediatricians. Data are presented ...that concern classification, genetics, characterization of clinical and biochemical phenotype, prevention, and therapy of 18 nosological units included in the class of peroxisomal disorders. Problems of general biological significance are reviewed, which can be solved using peroxisomal disorders as a valuable experimental model.
This paper is the first in a series devoted to the investigation of the possible effect of maternal genotype on the levels of fetal alpha-fetoprotein (AFP) and human chorionic gonadotrophin (HCG) ...entering maternal blood. We studied the possible association between the maternal haptoglobin system and levels of maternal AFP and HCG, which are markers of fetal pathology. Haptoglobin types were determined in groups of pregnant women with different levels of serum markers. Distribution of haptoglobin types differed from the theoretically expected in one out of five groups tested. In the group with low AFP level, a significant decrease in frequency of the Hp*2 allele was found. A statistically significant decrease of the mean haptoglobin concentration in the group with low levels of AFP and elevated levels of HCG was observed. A reduction in serum haptoglobin concentration was shown to be accompanied by a decrease of serum iron concentration. The possible mechanism underlying the influence of maternal genotype on the levels of AFP and HCG in maternal blood are discussed.
The phenotypes of the rhesus system in pregnant females were studied for impact on maternal blood chorionic gonadotropin (CGT) levels in the second trimester. The polymorphism of the rhesus system ...was determined in the groups of pregnant females (n = 1591) having different blood CGT levels. There was a significant increase in the frequency of the Rh(d) phenotype (p < 0.01) among the pregnant women with lower chorionic gonadotropin levels. There was also an evident bimodality in the distribution among RH(d) pregnant females.
