industrial production
Recently Published Documents


TOTAL DOCUMENTS

3211
(FIVE YEARS 985)

H-INDEX

66
(FIVE YEARS 8)

2022 ◽  
Author(s):  
Olga L. Meshcheryakova ◽  
Galina P. Shuvaeva ◽  
Tatyana V. Sviridova ◽  
Anna A. Tolkacheva ◽  
Olga S. Korneeva

The researchers of this study investigated the biosynthesis of squalene by the yeast S. cerevisiae VGSH-2 through the activity of squalene epoxidase, which is a key enzyme in the conversion of squalene to ergosterol. It has been established that under aerobic conditions the antimycotic drug terbinafine promotes the switching of ergosterol formation to squalene synthesis. This switch occurs through specific inhibition of the squalene epoxidase of the yeast S. cerevisiae VGSH-2, thus increasing the biosynthetic ability of the yeast towards squalene. According to the results of this study, the optimal concentration of terbinofine in the nutrient medium was 0.3 μmol / cm3 . This concentration led to a 5-fold decrease in squalene epoxidase activity and a 7-8 times increase in squalene synthesis. The results obtained can be used to develop a competitive technology for the industrial production of squalene by microbial synthesis. Keywords: squalene, yeast, biosynthesis, inhibition of activity, terbinafine, squalene epoxidase, Saccharomices cerevisiae VGSH-2


Author(s):  
Doan Thi Oanh ◽  
Duong Thi Thuy ◽  
Nguyen Thi Nhu Huong ◽  
Hoang Thi Quynh ◽  
Phung Duc Hieu ◽  
...  

Microplastics (particles with a size of less than 5 mm) are a rising environmental problem. Microplastics can disseminate in the air and accumulate in sediments as well as in microorganisms and humans, due to their small size. Sediment is considered to be the major repository of microplastics, particularly those of the PE type. Microplastics in massive amounts accumulated in sediments, perhaps as a result of point sources or diffuse contamination. Microplastic contamination can spread from industrial production facilities, urban areas, agricultural areas, or the air. The current study was carried out to explore the occurrence of MPs in sediments at discharge sources by evaluating 27 sediment samples taken from 9 distinct waste sources from industrial activity locations to determine the amount of microplastic contamination in sediments at discharge sources. Microplastics with relatively high density were found in all sediment samples in this research, ranging from 2,900 to 238,200 particles/kg dw. The most prevalent microplastics detected in sediment samples at these sites were fibers and fragments, accounting for 59-94% and 6-41%, respectively. Fiber microplastics ranged in size from 1000 to 9,000 µm, whereas fragment microplastics ranged from 200,000 to 2,100,000 µm2. Microplastics with < 1000 µm and 1000-2000 µm sizes accounted for a significant portion of the total, reaching 21.05-37.84% and 39.74-61.17%, respectively. The hue of microplastic particles in sediment samples obtained was highly varied.


2022 ◽  
pp. 37-41
Author(s):  
Максим Валерьевич Марченок ◽  
Егор Олегович Рочин ◽  
Марина Всеволодовна Палагина ◽  
Людмила Александровна Текутьева

Проведен анализ информационных источников по существующим технологиям получения витаминов B и B. Кратко описаны преимущества и недостатки известных технологий с использованием различных штаммов-продуцентов, а также технологий с использованием химического синтеза. Предложена принципиальная схема разрабатываемых технологий синтеза данных витаминов, определены наиболее продуктивные штаммы-продуценты и необходимые компоненты питательных сред. Обоснован и представлен перечень продуктов, предназначенных для обогащения витаминами группы В, которые будут получены по разрабатываемым технологиям. The analysis of information sources on existing technologies for obtaining vitamins B and B has been carried out. The advantages and disadvantages of known technologies using various producer strains, as well as technologies using chemical synthesis, are briefly described. A schematic diagram of the developed technologies for the synthesis of these vitamins is proposed, the most productive strains - producers and necessary components of nutrient media are identified. The list of products intended for enrichment with B vitamins, which will be obtained by the developed technologies, has been substantiated and presented.


2022 ◽  
Vol 10 (01) ◽  
pp. 2881-2887
Author(s):  
Stamatis Kontsas ◽  
Stavros Kalogiannidis

Global GDP is really important for trade, since the larger the global economy, the more goods and services available for trade. Global GDP grew by around two-thirds in real terms between 2000 and 2020 – or 2.6% per year on average.2020 saw some of the largest trade reductions and output volumes for both industrial production and goods trade since WWII. The year 2020 was marked by some of the largest reductions in trade and output volumes since WWII. The declines in both world industrial production and goods trade in the first half of 2020 were of similar depth to those at the trough of the Global Financial Crisis (GFC). In addition, trade and production impacts across specific goods, services and trade partners were highly varied. Initial pandemic-era expectations for a double-digit decline in world merchandise trade in 2020 did not materialise. Global trade turned out to recover from the shock at an extraordinarily fast pace from around mid-2020.


Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 97
Author(s):  
Monica Billio ◽  
Lorenzo Frattarolo ◽  
Dominique Guégan

We use a recently proposed fast test of copula radial symmetry based on multiplier bootstrap and obtain an equivalent randomization test. The literature shows the statistical superiority of the randomization approach in the bivariate case. We extend the comparison of statistical performance focusing on the high-dimensional regime in a simulation study. We document radial asymmetry in the joint distribution of the percentage changes of sectorial industrial production indices of the European Union.


Author(s):  
Liangliang Wang ◽  
Qi Yao ◽  
Jun Yue ◽  
Xirui Jiang ◽  
Fangfang Li

2022 ◽  
Author(s):  
Mian Ahmad Jan

Abstract In industrial production, defect detection is one of the key methods to control the quality of mechanical design products. Although defect detection algorithms based on traditional machine learning can greatly improve detection efficiency, manual feature extraction is required and the design process is complicated. With the rapid development of CNN, major breakthroughs have been made in computer vision. Therefore, building a surface defect detection algorithm for mechanical design products based on DCNNs plays a very important role in improving industrial production efficiency. This paper studies the surface defect detection algorithm of mechanical products based on deep convolutional neural network, focusing on solving two types of problems: defect recognition and defect segmentation. Aiming at the problem of defect recognition, this paper studies a defect recognition algorithm based on fully convolutional block detection. This algorithm introduces the idea of block detection into the ResNet fully convolutional neural network. While realizing the local discrimination mechanism, it overcomes the shortcomings of the traditional block detection receptive field. Compared with the original ResNet image classification algorithm, this algorithm has stronger generalization ability and detection ability of small defects. Aiming at the problem of defect segmentation, this paper studies a defect segmentation algorithm based on improved Deeplabv3+.


Author(s):  
Jianan Yin ◽  
Guohe Huang ◽  
Chunjiang An ◽  
Renfei Feng

The widespread cellulose nanomaterials from industrial production and natural plant degradation inevitably lead to the accumulation of nanocellulose in aquatic environment. However, the effect of nanocellulose on the fate, transport...


Sign in / Sign up

Export Citation Format

Share Document