scholarly journals Research Progress of Porcine Reproductive and Respiratory Syndrome

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Xueqi Liao
Keyword(s):  
Genetic Diversity ◽  
Genetic Variation ◽  
Immune Suppression ◽  
Persistent Infection ◽  
The Body ◽  
Research Progress ◽  
Respiratory Syndrome Virus ◽  
Control Technology ◽  
Reproductive Disorder ◽  
And Control

Porcine Reproductive and Respiratory Syndrome (PRRS) is caused by Porcine Reproductive and Respiratory Syndrome Virus (PRRSV), which is characterized by sow reproductive disorder and piglet respiratory syndrome. The complex pathogenesis of PPRS includes antibody-dependent enhancement, immune suppression and persistent infection in the body and viral genetic diversity. In order to have a better understanding of the occurrence and prevalence of porcine reproductive and respiratory syndrome in China. The review of PRRS etiology, epidemiology, pathogenesis, genetic variation, diagnosis and control technology and other aspects of the progress were carried out.

scholarly journals Porcine Reproductive and Respiratory Syndrome Virus: Description of Persistence in Individual Pigs upon Experimental Infection

2000 ◽  
Vol 74 (22) ◽  
pp. 10834-10837 ◽  
Author(s):  
R. Allende ◽  
W. W. Laegreid ◽  
G. F. Kutish ◽  
J. A. Galeota ◽  
R. W. Wills ◽  
...  
Keyword(s):  
Steady State ◽  
Viral Replication ◽  
Experimental Infection ◽  
Persistent Infection ◽  
Genetic Stability ◽  
The Body ◽  
M Protein ◽  
Envelope Glycoproteins ◽  
Respiratory Syndrome Virus

ABSTRACT We studied the persistence of porcine reproductive and respiratory syndrome virus (PRRSV) in individual experimentally infected pigs, during a period of up to 150 days postinfection (dpi). The results of this study suggest that the persistence of PRRSV involves continuous viral replication but that it is not a true steady-state persistent infection. The virus eventually clears the body and seems to do it in most of the animals by 150 dpi or shortly thereafter. High genetic stability was seen for several regions of the persistent PRRSV's genome, although some consistent mutations in the genes of envelope glycoproteins and M protein were also observed.

scholarly journals Research Status of Pathogenesis of Pneumoconiosis and Dust Control Technology in Mine—A Review

2021 ◽  
Vol 11 (21) ◽  
pp. 10313
Author(s):  
Guoming Liu ◽  
Qianqian Xu ◽  
Jipeng Zhao ◽  
Wen Nie ◽  
Qingkun Guo ◽  
...  
Keyword(s):  
Occupational Health ◽  
Prevention And Control ◽  
Dust Control ◽  
Dust Removal ◽  
Research Progress ◽  
Control Technology ◽  
Dust Suppression ◽  
Efficient Treatment ◽  
Mine Dust ◽  
And Control

Pneumoconiosis has become one of the biggest threats to the occupational health and life safety of mining workers in China. The number of pneumoconiosis cases has continued to rise in recent years. The main task of occupational health development is to study the pathogenesis of pneumoconiosis and to develop mine dust prevention and control technology. Therefore, this paper summarizes the research progress of coal worker pneumoconiosis and dust prevention and control in mines. Firstly, the research progress of coal worker pneumoconiosis is analyzed from the aspects of pathogenesis, animal model and pathological changes of coal worker pneumoconiosis. Then, the existing basic theory and technology of dust prevention are described, including ventilation and dust removal, spray and dust suppression, and chemical dust suppression methods. Finally, based on the dust removal theory of wet shotcrete, the progress of shotcrete dust control technology and equipment used for shotcrete is summarized from the aspects of shotcrete technology process and shotcrete materials. At the same time, in view of the shortcomings of the existing research, the next research prospect is given in the pathogenesis of pneumoconiosis, intelligent dust prevention, jet spraying dust removal and so on. This paper provides theoretical support for realizing the separate source and efficient treatment of mine dust control and helps to improve the clean production level of mine, control and prevent pneumoconiosis.

scholarly journals Analysis of Genetic Variation of Two NADC30-like Strains of Porcine Reproductive and Respiratory Syndrome Virus in China

2017 ◽  
Vol 11 (1) ◽  
pp. 90-97
Author(s):  
Zhi Zhou ◽  
Jiajun Wu ◽  
Shuo Zhang ◽  
Bo Hou ◽  
Tao Han ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Amino Acids ◽  
Phylogenetic Analysis ◽  
Genetic Variation ◽  
North America ◽  
Untranslated Region ◽  
Respiratory Syndrome Virus ◽  
Nucleotide Deletion ◽  
Complete Genomes ◽  
Swine Herds

Background: NADC30-like strains of porcine reproductive and respiratory syndrome virus first appeared in Chinese swine herds in 2012. Objective and Method: To explore the possible genetic diversity of these strains, we sequenced and analyzed the complete genomes of two NADC30-like strains. These isolates shared 95.4% homology with NADC30. Result: The two strains displayed a discontinuous deletion of 131 amino acids in NSP2, mutations of amino acids in GP3 and GP5, and a 3-nucleotide deletion in the 3′ untranslated region. Phylogenetic analysis showed that the two isolates formed a new branch and clustered in a subgroup with NADC30 isolates from North America. Conclusion: We conclude that the above two NADC30-like strains may have been introduced from North America to China, where they acquired new genetic diversity.

scholarly journals Advanced Research in Porcine Reproductive and Respiratory Syndrome Virus Co-infection With Other Pathogens in Swine

2021 ◽  
Vol 8 ◽  
Author(s):  
Dengshuai Zhao ◽  
Bo Yang ◽  
Xingguo Yuan ◽  
Chaochao Shen ◽  
Dajun Zhang ◽  
...  
Keyword(s):  
Persistent Infection ◽  
Prevention And Control ◽  
Secondary Infection ◽  
Respiratory Syndrome Virus ◽  
The World ◽  
And Control

The porcine reproductive and respiratory syndrome virus (PRRSV) is the pathogen causing epidemics of porcine reproductive and respiratory syndrome (PRRS), and is present in every major swine-farming country in the world. Previous studies have demonstrated that PRRSV infection leads to a range of consequences, such as persistent infection, secondary infection, and co-infection, and is common among pigs in the field. In recent years, coinfection of PRRSV and other porcine pathogens has occurred often, making it more difficult to define and diagnose PRRSV-related diseases. The study of coinfections may be extremely suitable for the current prevention and control in the field. However, there is a limited understanding of coinfection. Therefore, in this review, we have focused on the epidemiology of PRRSV coinfection with other pathogens in swine, both in vivo and in vitro.

The Design and Control of the Humanoid Walking Robot

2013 ◽  
Vol 380-384 ◽  
pp. 328-331
Author(s):  
Ze Fu Bao ◽  
Peng Zang ◽  
Jiang Ping Wang
Keyword(s):  
Dynamic Characteristics ◽  
Human Body ◽  
Humanoid Robot ◽  
Tai Chi ◽  
The Body ◽  
Control Technology ◽  
Walking Robot ◽  
Development Platform ◽  
And Control ◽  
Full Body

The paper focuses on researching the biped humanoid walking robot about its dynamic characteristics and the control technology. The humanoid robot adopts the structure of a human body. There are a total of 19 DOF full body which results in a high balanced capacity and easily controlled arms and legs. In this way, the robot can make all kinds of imitation of human actions, such as tai chi, dancing and so on. My robot can serve as a development platform. By installing different modules of sensors to change or expand the functions of the body, the robot can satisfy the users demand in an economical way.

Perbandingan Efek Suplementasi Tablet Tambah Darah Dengan Dan Tanpa Vitamin C Terhadap Kadar Hemoglobin Pada Ibu Hamil Dengan Usiakehamilan 16-32 Minggu Di Desa Keniten Kecamatan Mojo Kabupaten Kediri

2017 ◽  
Vol 3 (1) ◽  
pp. 76
Author(s):  
Siti Asiyah ◽  
Dwi Estuning Rahayu ◽  
Wiranti Dwi Novita Isnaeni
Keyword(s):  
Treatment Group ◽  
Vitamin C ◽  
Gestational Age ◽  
Group Treatment ◽  
Sampling Technique ◽  
Hemoglobin Level ◽  
The Body ◽  
Control Group ◽  
Fetal Organ ◽  
And Control

The needed of Iron Tablet in pregnancy was increase than mother who not pregnant.  That  cause of  high metabolism at the pregnancy for formed of  fetal organ and energy. One of effort for prevent anemia in mother pregnant with giving the Iron tablet and vitamin c. The reason of  this research in 4 June – 11 July 2014 is for compare the effect of  iron tablet suplementation with and without vitamin C toward Hemoglobin level in mother pregnant With Gestational Age Of 16-32 Weeks In Desa Keniten Kecamatan Mojo Kabupaten Kediri. This research method using comparative analytical.  Research design type of Quasy Eksperiment that have treatment group and control group. Treatment group will giving by Iron tablet and 100 mg vitamin C, and control group just giving by iron tablet during 21 days. Population in this research are all of mother pregnant with Gestational Age Of 16-32 Weeks with Sampling technique is  cluster random sampling is 29 mother pregnant. Comparison analysis of  iron tablet suplementation effect with and without vitamin C toward Hemoglobin level in mother pregnant With Gestational Age Of 16-32 Weeks, data analysis using Mann Whitney U-test and the calculated U value (44,5) less than U-table (51). So there was difference of iron tablet suplementation effect with and without vitamin C toward Hemoglobin level in mother pregnant With Gestational Age Of 16-32 Weeks Therefore, the addition of vitamin C on iron intake is needed to increase the uptake of iron tablets. When the amount of iron uptake increases, the reserves of iron in the body will also increase, so as to prevent anemia in pregnant women; Keywords : Iron Tablet (Fe), Vitamin C, Hemoglobin level, Mother Pregnant

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