asynchronous development
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2023 ◽  
Vol 83 ◽  
Author(s):  
G.R. Felicio ◽  
J.G. Cordeiro ◽  
B.P. Dutra-Costa ◽  
C. Maximino ◽  
G.S. Branco ◽  
...  

Abstract The knowledge of the testicular and ovarian morphology of a particular fish species is of paramount importance. Such analyze enables the development of studies and techniques aiming the improvement of their reproduction, management, commercialization and even their conservation. This study performed the ovarian and testicular characterization of the ornamental Amazon fish Serrapinnus kriegi. A total of three males and three females had their gonads analyzed by optical microscopy. Females present ovaries filled with oocytes in asynchronous development, indicating partial spawning in the species. Moreover, the micropyle and micropilar cell formation was observed in primary growing oocytes, representing a precocious oocyte development; and the zona radiata in the final vitellogenic oocytes is thicker than other related species, evidencing the development of a better protection to the embryos in function of the waters’ turbulence that characterize it spawning sites in the Amazonian streams. The male specimens’ present anastomosed tubular testes with unrestricted spermatogonia spread along the entire seminiferous tubules. The present data elucidate the dynamic of spermatogenesis and oogenesis of an ornamental Amazonian species, through the description of the male and female germ cells development.


2021 ◽  
pp. 65-73
Author(s):  
Alexander Strizoe

The article considers the main trends and features of the impact of social isolation measures in a global pandemic on the life of modern society. The author notes that the practice of implementing measures of social isolation distinguishes certain social strata, pushing others to the periphery of managerial attention and support; aggravates feelings of social inequality of opportunity, changes space and intensity of individual and social mobility; affects the authority of local and regional government and attitudes towards them. The article describes various aspects and difficulties of individual and social adaptation to the pandemic. The carried out comparative analysis of European and Russian sociocultural context, in which social challenges of the pandemic are manifested, shows their common features: aggravation of problems of social adaptation, different degrees of readiness for it, an asynchronous development of integration processes, an authoritarian-conservative turn in the mass consciousness. The characteristic of the main trends of changes in consciousness and behavior is given, in which the response of Russian society to the challenges of new living conditions and the pandemic reformatting of the social communications space is manifested. The attention to the multidirectional character of adaptation strategies of the population is drawn. The author expresses the opinion that the choice of the optimal variant of society's adaptation to global environmental, including pandemic, challenges is determined both by the elite's ability to transform social institutions and by a change in the dominant personality type. An atomized type of individual, focused on the values of early modernity, in whose subconsciousness authoritarian-paternalistic attitudes are preserved, should be replaced by a type of personality, with qualities and abilities corresponding to the imperatives of a complex and dynamically changing modern society.


2021 ◽  
Vol 937 (2) ◽  
pp. 022008
Author(s):  
O I Podurets ◽  
M A Osintseva

Abstract The relevance of the study is caused by the problem of the global anthropogenic transformation of natural landscapes in Kuzbass as a result of the development of mining. The rate of reclamation of disturbed lands lags behind the rate and scale of their formation, and most of the territory is self-recovering. This paper is aimed at studying the ecological conditions of the natural environment and technogenic factors affecting the dynamics of soil-forming processes and the formation of phytocenoses in disturbed territories, which differ in the way of formation at the technogenic stage. For the first time, some physicochemical parameters of technozems were obtained. Like ebriozems, they are formed in the post-technogenic phase of the development of a technogenic landscape under the conditions of its self-growth. The similarities and differences in the properties of technozems and ebriozems formed in the same natural and climatic conditions of the southern forest-steppe zone of Kuzbass have been revealed. It was found that the rate of their transformation, expressed in the formation of the soil profile, depends on the conditions of the relief and underlying rocks created at the technogenic stage. The presence of a preserved layer of potentially fertile rocks and the absence of slope surfaces led to the formation of the frontal soil and vegetation cover of the technozem; under other conditions, the formation of soils and plant groups occurs fragmentarily, which leads to the asynchronous development of the functions and modes of the technogenic landscape.


Author(s):  
A. K. Sharmagiy ◽  
S. P. Korsakova

In 2018-2020 phenological observations of Cydalima perspectalis Walker were carried out in two agroclimatic regions of the Crimea. The pest, both on the Southern Coast of the Crimea and in the central foothill zone, develops in three generations. The sum of effective temperatures required for the development of generations varies over the years in a wide range, which is due to the asynchronous development of the caterpillars of C. perspectalis . The beginning of summer of the adults of the overwintered generation over the years of research in both regions differed insignificantly and was noted with the accumulation of the sums of effective air temperatures above 10°С on the Southern Coast of the Crimea from 210 to 297 degree days, and in Simferopol - from 222 to 299 degree days. It was found that in the summer months in the central foothill zone of the Crimea, in terms of temperature indicators, more favorable conditions are created for the development of boxwood firewood than on the Southern Coast of the Crimea. The combination of hydrothermal conditions, in which air temperatures exceed 33-36°C, and the relative humidity drops below 19-49%, cause the death of up to 20-28% of Cydalima perspectalis egg embryos at an early stage of embryogenesis. From the embryos of eggs of later stages of embryogenesis, under these conditions, the hatching of caterpillars occurred by 100%.


PLoS Genetics ◽  
2021 ◽  
Vol 17 (11) ◽  
pp. e1009910
Author(s):  
Yalan Yang ◽  
Junyu Yan ◽  
Xinhao Fan ◽  
Jiaxing Chen ◽  
Zishuai Wang ◽  
...  

Natural and artificial directional selections have resulted in significantly genetic and phenotypic differences across breeds in domestic animals. However, the molecular regulation of skeletal muscle diversity remains largely unknown. Here, we conducted transcriptome profiling of skeletal muscle across 27 time points, and performed whole-genome re-sequencing in Landrace (lean-type) and Tongcheng (obese-type) pigs. The transcription activity decreased with development, and the high-resolution transcriptome precisely captured the characterizations of skeletal muscle with distinct biological events in four developmental phases: Embryonic, Fetal, Neonatal, and Adult. A divergence in the developmental timing and asynchronous development between the two breeds was observed; Landrace showed a developmental lag and stronger abilities of myoblast proliferation and cell migration, whereas Tongcheng had higher ATP synthase activity in postnatal periods. The miR-24-3p driven network targeting insulin signaling pathway regulated glucose metabolism. Notably, integrated analysis suggested SATB2 and XLOC_036765 contributed to skeletal muscle diversity via regulating the myoblast migration and proliferation, respectively. Overall, our results provide insights into the molecular regulation of skeletal muscle development and diversity in mammals.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Emma M. Briggs ◽  
Federico Rojas ◽  
Richard McCulloch ◽  
Keith R. Matthews ◽  
Thomas D. Otto

AbstractDevelopmental steps in the trypanosome life-cycle involve transition between replicative and non-replicative forms specialised for survival in, and transmission between, mammalian and tsetse fly hosts. Here, using oligopeptide-induced differentiation in vitro, we model the progressive development of replicative ‘slender’ to transmissible ‘stumpy’ bloodstream form Trypanosoma brucei and capture the transcriptomes of 8,599 parasites using single cell transcriptomics (scRNA-seq). Using this framework, we detail the relative order of biological events during asynchronous development, profile dynamic gene expression patterns and identify putative regulators. We additionally map the cell cycle of proliferating parasites and position stumpy cell-cycle exit at early G1 before progression to a distinct G0 state. A null mutant for one transiently elevated developmental regulator, ZC3H20 is further analysed by scRNA-seq, identifying its point of failure in the developmental atlas. This approach provides a paradigm for the dissection of differentiation events in parasites, relevant to diverse transitions in pathogen biology.


2021 ◽  
Author(s):  
Nina Fulga ◽  
◽  
Laurentia Ungureanu ◽  
Dumitru Bulat ◽  
Denis Bulat ◽  
...  

In the lower Dniester, polyploid females of the hybrid complex Cobitis taenia are a portion spawning species with asynchronous development of germ cells during the entire breeding period. The spawning season in this water basin begins in the second decade of May and ends in July. In the population, in parallel with females, hermaphrodite individuals are also present, in which the ovary zone is functional, and the testis zone is sterile. A decrease in the relative mass of the gonads of subsequent generations was noted, which leads to a consistent decrease in the value of the gonadosomatic index, in females, before the second and third spawning.


2021 ◽  
pp. 1-11
Author(s):  
Zachary S. Balzer ◽  
Arthur R. Davis

Abstract Stylops advarians Pierce (Strepsiptera: Stylopidae) is a prevalent parasite of adult Andrena milwaukeensis Graenicher (Hymenoptera: Andrenidae) in Saskatoon, Saskatchewan, Canada. By dissecting adult bees and examining histological sections, we sought to determine how neotenic females of S. advarians impact female hosts of A. milwaukeensis anatomically. Adult bees with 1–3 females of S. advarians within their gasters were compared to nonstylopised bees (control). The presence of a single female parasite inhibited development of the host’s ovaries. The bee’s foregut shifted laterally when one parasite occupied the gaster and ventrally when two or three were present, thereby reducing the crop’s expandable capacity and the amount of nectar and pollen that stylopised bees can ingest. The midgut and hindgut were less significantly affected by stylopisation. Female parasites typically occupied the host’s gaster dorsolaterally, where each was supported by one of the host’s air sacs. If a third female parasite was present, she resided dorsally along the midline of the host’s gaster, mostly supported by the two female parasites to either side. Asynchronous development within neotenic female parasites was demonstrated, wherein mature first-instar larvae occupied the cephalothorax and abdomen at the same time that the adult female was still supporting multiple embryos.


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mei Yu ◽  
Tongran Liu ◽  
Fangfang Shangguan ◽  
Jingxin Sui ◽  
Jiannong Shi

AbstractChildren are found to exhibit high degrees of delay discounting compared with adults in many delay discounting studies, which might be due to the asynchronous development of “bottom-up” and “top-down” neural systems. However, the temporal dynamics associated with the two systems in the development of delay discounting processes are not well known. In this study, we chose two age groups of participants and adopted event-related potential (ERP) techniques to investigate the neural dynamic differences between children and adults during delay discounting processes. Behavioral findings showed that children discounted more than adults and chose more immediate choices. Electrophysiological findings revealed that children exhibited longer neural processing (longer P2 latency) than adults during the early detection and identification phase. Children showed less cognitive control (smaller N2 amplitude) than adults over the middle frontal areas, and they devoted more neural effort (larger P3 amplitudes) to making final choices than adults. The factors of reward amount and time delay could influence the development of delay discounting in children.


Author(s):  
Илья Владимирович Тишин

Статья нацелена на выявление особенностей современного института государственного внутреннего долга регионов Российской Федерации, а именно - на подтверждение факта цикличности и асинхронности современных долговых отношений в России. Научная новизна работы представлена анализом современных тенденций в области объемов государственных долговых обязательств регионов России, а также установлением эмпирической взаимосвязи между основными формами долга. По результатам работы представлен желаемый сценарий дальнейшего развития одной из ключевых форм государственных долговых отношений - бюджетного кредитования, а также проработаны вопросы адаптации модели антицикличности Джона Мейнорда Кейнса The article is aimed at identifying the features of the modern state internal debt system in the regions of the Russian Federation. The main idea is to confirm the cyclical and asynchronous nature of modern debt relations in Russia. The scientific novelty of the work is the analysis of modern trends in the volume of public debt, as well as the establishment of an empirical relationship between the main forms of debt in Russia. As a result of the work, the desired scenario for the further development of budget credit in Russia is presented. Besides, in this article we consider the approach of John Maynard Keynes in a cyclical economy.


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