Objective To select excellent tomato mutants by space treatment and to cultivate directly new varieties for production application and good seed resource.Methods Seeds of tomato cultivar were carried into space by scientific experiment recoverable satellite.The main agricultural characters of tomato mutant were observed and analyzed.Results Seeds of determinate growth habit tomato cultivar T10-3-2 were carried into space in 2002 by a recoverable satellite(Shenzhou 4).After cultivation and selection,two tomato variants(H1 and H2) and their offspring populations were obtained in SP2.Variations included quantitative character variations such as maturity,fruit characters and fruit trait,as well as genetic character variations such as changes from determinate growth to indeterminate growth of plant growth habits,and from the no shoulders to the green shoulders of fruits.These two kinds of changes were dominant mutations,and could inherit stably.The research also indicated that variations(amplitude,standard deviation and coefficient of variation) of each generation of two mutants,reduced along with generation increasing.It was showed these characters to be easily stable.Conclusion Tomato seeds loaded on spacecraft can truly form the tomato character variation,and the variation character may be stably inherited.

Objective To evaluate the indeterminate growth mutant of tomato derived by space mutagenesis to provide the basis for selecting and cultivating the molecular markers of tomato growth habit. Methods Fifty 10-mer randomly amplified polymorphic DNA(RAPD) primers were used to examine the polymorphism of M1 and 10-3-2. Their polymorphic fragments were cloned, and then were transferred to SCAR markers. Results Of all the 50 10-mer RAPD primers, 44 primers amplified polymerase chain reaction(PCR) products and 2 primers (S165 and S168) amplified stable reproducible polymorphic products. The molecular weight of the specific amplified products were 300 bp and 1 500 bp respectively, therefore they were named as TRS165300 and TRS1681500 temporarily. And TRS1681500 was transferred into stable sequence characterized amplified region(SCAR) marker and this marker could be a specific genetic marker of this indeterminate growth habit mutant. Conclusion Space mutation can produce mutants at DNA level from the loaded materials. The indeterminate growth mutant of tomato is derived by space mutagenesis which can provide a valuable material for studying the regulation and control of tomato growth habit.

Objective To select excellent tomato mutants by space treatment and to cultivate directively new varieties for production application.Method Growth dynamics and change of agricultural characters of the mutant of indeterminate growth habit was observed.And the enzymogram and activity of two kinds of main isoenzyme were analyzed.Result An indeterminate growth habit mutant(M1) which derived from a determinate growth habit cultivar(10-3-2) was obtained from the 1st generation after space treatment(SP_1).Being an inherited character,the indeterminate growth habit of the mutant can be expressed from generation to generation.The plant height of M1 was 145 cm,42.0 cm higher than that of the background one(increased by 29.6%),when the background plant height was determined.The main stem diameter of the mutant was 1.22 cm,0.34 cm thicker than that of background parent.However,there were no visible difference in the fruit size and fruit set percentage between them.The biological characters of M1 and its progenies were studied,and the results showed that the indeterminate growth have no side effects on the agronomic characters and fruit quality,and the mutant had a potentiality of higher yield if the condition is suitable.The activity of two enzymes,SOD and POD,was assayed and there were no obvious difference of SOD activities and enzymograms between the mutant and its background parent,but POD activity was much lower in mutant than that in its background parent.Conclusion After observation through 3 generations,it is found that indetermination growth habit is inheritable and stable.

Taking 5 modes of large-scale X-ray apparatus as examples including GE TX-Ⅲ 500mA, Shimadzu ED125L 500 mA, GE VR 500 mA, Siemens Tridoros 5S 1 000 mA, Siemens Heliophos 5S 500 mA, the replacement techniques are introduced in such aspects as the preparation of rooms and tools before replacement, disassembly, transport, reinstallation, electrifying and test. Cooperation of personnel is an important factor to smoothly complete the task.

Objective To explore mechanical property changes of methyl vinyl silicone rubber modified by ferric nanoparticles and its dispersed phase.Methods Mechanical properties such as Shore A hardness,tensile strength,elongation at break,tearing rate of permanent deformation and tearing strength of pre-prepared ironic nanoparticle enhanced silicone rubber and carbon-coated ferric particle reinforced silicone rubber were tested according to national standards.A thermal field emission scanning electron microscope (TFE-SEM) was used to investigate the morphology of both surface and fracture of the composite materials and to observe the dispersion of ferric nanoparticles in them.Results Mean values of Shore A hardness,tensile strength,elongation at break,tearing permanent deformation rate and tear strength of modified composites increased with the increasing amounts of ferric nanoparticles,however,when the quota of ironic nanoparticles in the composite formula were greater than 17 phr,carbon-coated ferric nanoparticles more than 19 phr,the mean values of tensile strength of two composites stopped increasing and presented the declining trend.When the quota of ferric nanoparticles in the formula exceeding 15 phr,the mean values of elongation at break and tear strength began to decrease in the formula ratio of silicone rubber/ferric nanoparticles up to 85:15,while the Shore A hardness of samples increased all the way.Ferric nanoparticles dispersed evenly on the surface of composites.Nanopowder aggregation in the fracture surface of both composites could be observed at the formula ratio of 85:15 of silicone rubber/iron nanoparticle and 87:13 of silicone rubber/carbon-coated iron specimen.Conclusion Effect of iron nanapareticles and carbon-coated ferric nanoparticles on the mechanical properties of the reinforced methyl vinyl silicone rubber depends on the nanoparticle size,additive amount and agglomeration.

Abstract] Objective To analyze the molecular characteristics of the full-length genome of a new-ly isolated genotypeⅤJapanese encephalitis virus (JEV) strain (XZ0934) in China and the first genotypeⅤJEV strain ( Muar) isolated in Malaya 60 years ago.Methods Several softwares including ClustalX 2.0.9, DNAStar 7.1, Bioedit 7.2.5 and MEGA6.06 were used to conduct sequence alignments and phylo-genetic analysis.Results The full-length genomes of XZ0934 strain (isolated in Tibet, China in 2009) and Muar strain (isolated in Malaya in 1952) were composed of 10 983 and 10 988 nucleotides, respective-ly.The XZ0934 strain was highly similar with the Muar strain showing the homology of 90.6%in nucleotide (nt) and 98.3%in amino acid (aa).The open reading frame (ORF) of the two genotype Ⅴ JEV strains encoded 3433 aa while the ORF of other four genotypes (Ⅰ-Ⅳ) (10 299 nt) encoded 3432 aa.Compared with JEV strains of other genotypes, a serine were inserted into the NS4A gene of JEV strains genotype Ⅴand 10-14 nucleotides were inserted into the downstream of the ORF stop codon in 3′-untranslated region. Phylogenetic analysis of E sequences of all JEV strains genotypedⅠ-Ⅴrevealed that in the cluster of geno-typeⅤ, XZ0934 and 10-1827 ( isolated from mosquitoes in South Korea, 2010) stains formed a branch and were divergent from that of Muar strain indicating that there were molecular genetic differences among geno-typeⅤJEV strains after a 60 years hiatus.Conclusion The two genotypeⅤJEV strains showed high lev-els of identity in nucleotide sequences and amino acid sequences with serine insertion in the NS4A gene. However, there were molecular genetic differences between genotypeⅤJEV strains isolated after a 60 years hiatus.

Objective It is important to precisely determinate the single nucleotide polymorphisms (SNPs) in many genes in‐cluding genes related with base excision repair (BER) pathway .This research is conducted to evaluate the role of polymerase chain reaction with confronting two‐pair primers (PCR‐CTPP) in analyzing the SNPs of BER pathway .Methods Four common SNPs of BER pathway (OGG1 Ser326Cys ,XRCC1 Arg399Gln ,APE1 Asp148Glu and‐141T/G in the promoter region) was detected with PCR‐CTPP .10 of the products were sent for genotype sequencing .Compare the results of PCR and sequencing to evaluate the accu‐racy of PCR‐CTPP .Results The genotypes were exactly the same as the sequencing .Conclusion The PCR‐CTPP was a reliable and rapid detective technology for SNPs genotyping .Its broadest application would be great help for gene variant analysis .

Objective To analyze the expression characteristics of chemotherapeutic related genes (ERCC1 ,BRCA1 ,APE1 , RRM1 ,TUBB3 and TS) in non-small cell lung cancer(NSCLC) and their associations with the pathological types to provide the ex-perimental evidences for clinical individual chemotherapy .Methods The immunohistochemical SP method was used to determine the expression of ERCC1 ,BRCA1 ,APE1 ,RRM1 ,TUBB3 and TS genes in 733 patients with NSCLC .Chi-square test was performed to analyze the gene expression characteristics among different pathological types .Spearman relationship was conducted to evaluate the associations among the six genes and different pathological types .Results The expression of BRCA1 ,TUBB3 and TS had sta-tistical differences among three pathological types (P<0 .01);and these three genes showed a relationship with the pathological type (r=0 .107 ,-0 .229 and 0 .168 ,respectively ,P<0 .01) .ERCC1 vs .BRCA1 ,ERCC1 vs .APE1 and APE1 vs .RRM1 showed the pos-itive correlation(r=0 .214 ,0 .316 and 0 .222 ,respectively ,P<0 .01) .Conclusion The chemotherapeutic related gene expressions of NSCLC are related with the clinical pathological types .And the expressions of multiple markers are associated with each other .The combined detection of the chemotherapeutic related markers and the pathological types would be helpful to the decision making of individual chemotherapy in clinic .

Objective To construct a structural equation model to analyze the effect of various factors on the quality of life in stroke patients.Methods In this cross-sectional study,a total of 657 stroke patients from 2 ter-tiary A hospitals in Shanghai were enrolled as investigation subjects via convenience sampling methodology.General information questionnaire,Sense of Coherence Scale-13,Perceived Social Support Scale,Medical Coping Modes Questionnaire,National Institutes of Health Stroke Scale,Self-Esteem Scale and Stroke-Specific Quality of Life were utilized as the investigating tools;Mplus 7.4 was used to construct a structural equation model.Results The aver age score of quality of life in stroke patients was(178.30±30.30);neurological status,self-esteem were negatively cor-related with quality of life(P＜0.05);sense of coherence,social support,coping style were positively correlated with quality of life(P＜0.05);sense of coherence,taking a confrontational approach for coping,yielding and neurological status had a direct impact on quality of life(path coefficients were 0.471,0.169、0.135,-0.089,P＜0.05);social sup-port,self-esteem,sense of coherence and neurological status had an indirect impact on quality of life(path coefficients were 0.232,0.108,0.058,-0.058,P＜0.001).Conclusion The quality of life in stroke patients is influenced by multi-ple factors interactively,and sense of coherence is an important factor affecting the quality of life;adopting a confron-tational approach as coping styles,good social support and high self-esteem can improve the level of quality of life.

Objective To analyze the occurrence characteristics of adverse events following immunization (AEFI) of 23-valent pneumococcal polysaccharide vaccine (PPSV-23) in Hebei Province and to evaluate the safety of the vaccine. Methods AEFI cases related to vaccination of PPSV-23 in Hebei Province from January 1, 2020 to December 31, 2022 were collected through the AEFI surveillance module of Chinese Center for Disease Control and Prevention Information System. The incidence of reported AEFI cases were then analyzed and compared. Results The reported incidence rate of AEFI of PPSV-23 was 56.12 /100,000 doses, and the incidence rate of adverse reactions was 55.50 /100 000 doses. The incidence rate of common adverse reactions was 53.94/100 000 doses, and the incidence rate of rare adverse reactions was 1.56/100 000 doses. Most of the reported AEFI cases caused by PPSV-23 were common adverse reactions, which occurred mainly within one day after vaccination, and the overall regression was positive. Conclusion The 23-valent pneumococcal polysaccharide vaccine used in Hebei Province is safe，but its safety monitoring still needs to be strengthened.