Linearization signal conditioning circuit for tri-axial micro-grating MOEMS accelerometer.

This paper proposes what we believe to be a novel linearization signal conditioning circuit for a tri-axial micro-grating micro-opto-electro-mechanical systems (MOEMS) accelerometer. The output of a micro-grating accelerometer varies as a sine/cosine function of the acceleration. The proposed circuit utilizes a subdivision interpolation technique to process these nonlinear intensity variations and render a linear digital output across the full range. Such a linearization circuit was achieved through a 90-degree phase-shift circuit, high-precision DC bias-voltage and subdivision interpolation circuits to reduce the influence of phase, magnitude, and offset errors of the sine-cosine signals on the interpolation factor, improving the resolution and accuracy of acceleration detection. Experimental results demonstrated that the micro-grating MOEMS accelerometer achieves a resolution of sub-mg, cross-axis errors of 3.57%, 1.22% and 0.89% for x-, y- and z-aixs, respectively. The bias instabilities and velocity random walks for the vertical and lateral accelerometer are superior to 26 µg and 38.7 µg/√Hz. The tri-axial micro-grating MOEMS accelerometer exhibits significant potential for applications requiring high sensitivity and large operation ranges, including the automotive industry and military equipment.

High resistance risk of Phytophthora colocasiae to azoxystrobin in southeastern of China.

Quinone outside inhibitor (QoI) has been applied to manage taro leaf blight caused by Phytophthora colocasiae in southeastern of China for many years. The risk of P. colocasiae to QoI and the potential resistant mechanism remain unknown. In this study, the 74 P. colocasiae strains were sampled from southeastern of China. Sequence analysis of the QoI target Cytb showed one nucleotide variant in the fragment of this gene in this population, producing two haplotypes. The nucleotide variant leads to codon change at 142 (GGT to GCT) producing A142 (alanine) and G142 (glycine) in Hap_1 and Hap_2 strains, respectively. The sensitivity differentiation to azoxystrobin of two haplotypes were observed in vitro. The Hap_1 and Hap_2 strains were confirmed resistant and sensitive by control efficacy of label rate fungicide application, which was 3.0% and 88.8% treated with 500 µg/mL azoxystrobin, respectively. In addition, 10.0 µg/mL azoxystrobin plus 50 µg/mL salicylhydroxamic acid (SHAM) supplemented in PDA medium was identified as a discriminatory dose for differentiation of these two phenotype strains. The azoxystrobin resistant frequency reached 86.5%, indicating prevalence of QoI resistance in the field. Further fitness related features showed that no significant difference in temperature sensitivity, mycelial growth rate, sporangia production, zoospore release and aggressiveness between azoxystrobin-resistant and sensitive strains indicating no potential fitness cost for azoxystrobin resistance. Taken together, azoxystrobin resistance need to be taken into consideration to manage taro leaf blight in southeastern of China.

Antifungal Activity and Possible Mechanism of Streptomyces nojiriensis 9-13 Against Mycogone sp., Causing Wet Bubble Disease on Agaricus bisporus.

Wet bubble disease (WBD) in Agaricus bisporus caused by Mycogone species imposes a substantial economic loss to mushroom production in China. Currently, fungicide application is the main method to control WBD. However, excessive use of fungicides is challenged by the appearance of resistance and food safety. Therefore, it is necessary to explore safe and efficient strategies to control WBD. Strain 9-13, isolated from the rhizosphere soil of Taxus chinensis, showed strong inhibitory activity against three Mycogone species. According to morphological and biochemical characteristics and multilocus phylogenetic analysis, the strain was identified as Streptomyces nojiriensis. In addition, strain 9-13 extracts significantly inhibited mycelial growth and spore germination of M. perniciosa, M. rosea, and M. xinjiangensis in vitro. Strain 9-13 and its extracts also exhibited broad-spectrum antifungal activities against 12 selected plant pathogenic fungi. Scanning electron microscopic observations showed that the extracts destroyed mycelial structure, inducing mycelia to twist and shrink. Moreover, transmission electron microscopy revealed that the extracts resulted in severe plasmolysis, rupture of the cell membrane, and a decrease in cell inclusions, and the cell wall had a rough and uneven surface. Notably, the extracts obviously reduced disease severity and incidence of WBD by from 83.85 to 87.32% in fruiting bodies and 77.36% in mushroom beds and maintained fruiting time and color on harvested mushrooms. Collectively, these results clearly indicate that S. nojiriensis 9-13 is a promising biocontrol agent to control WBD on A. bisporus.

Resistance risk and resistance-related point mutations in cytochrome b of florylpicoxamid in Colletotrichum scovillei.

Anthracnose caused by Colletotrichum scovillei is one of the most destructive diseases of chili worldwide. Florylpicoxamid is a new quinone inside inhibitor (QiI) fungicide, which shows intensively inhibitory activity against C. scovillei. Currently, florylpicoxamid is in the registration process to control chili anthracnose in China. This study investigated the risk of resistance and resistance genetic mechanism of C. scovillei to florylpicoxamid. Baseline sensitivity of 141C. scovillei isolates to florylpicoxamid was established with an average EC50 value of 0.2328 ± 0.0876 µg/mL. A total of seven stable florylpicoxamid-resistant mutants were obtained with resistance factors ranging from 41 to 276. The mutants showed similar or weaker traits in mycelial growth, sporulation, conidial germination and pathogenicity than their parental isolates. Generally, the resistance risk of C. scovillei to florylpicoxamid would be moderate. In addition, there was no cross-resistance between florylpicoxamid and the commercially available fungicides tested. A37V and S207L mutations in the cytochrome b protein were detected in four high-resistance and three moderate-resistance mutants, respectively, of which, S207L is a new mutation. Molecular docking showed that the two mutations conferred different resistance levels to florylpicoxamid. These results provide a new perspective for QiI fungicide-resistance mechanism and may help in the reasonable use of florylpicoxamid against chili anthracnose in the future.

Analysis of the Difenoconazole-Resistance Risk and Its Molecular Basis in Colletotrichum truncatum from Soybean.

Anthracnose disease, caused by Colletotrichum truncatum, is a destructive fungal disease in soybean worldwide, and some demethylation inhibitor fungicides are used to manage it. In this study, the sensitivity of C. truncatum to difenoconazole was determined, and the risk for resistance development of C. truncatum to difenoconazole was also assessed. The results showed that the mean EC50 value was 0.9313 µg/ml, and the frequency of sensitivity formed a unimodal distribution. Six stable mutants with a mutation frequency of 8.33 × 10-5 were generated, and resistance factors ranged from 3.00 to 5.81 after 10 successive culture transfers. All mutants exhibited fitness penalties in reduced mycelial growth rate, sporulation, and pathogenicity, except for the Ct2-3-5 mutant. Positive cross-resistance was observed between difenoconazole and propiconazole but not between difenoconazole and prochloraz, pyraclostrobin, or fluazinam. One point mutation I463V in CYP51A was found in five resistant mutants. Surprisingly, the homologous I463V mutation has not been observed in other plant pathogens. CYP51A and CYP51B expression increased slightly in the resistant mutants as compared to wild-types when exposed to difenoconazole but not in the CtR61-2-3f and CtR61-2-4a mutants. In general, a new point mutation, I463V in CYP51A, could be associated with low resistance to difenoconazole in C. truncatum. In the greenhouse assay, control efficacy of difenoconazole on both parental isolates and the mutants increased in a dose-dependent manner. Collectively, the resistance risk of C. truncatum to difenoconazole is regarded to be low to moderate, suggesting that difenoconazole can still be reasonably used to control soybean anthracnose.

The Role of SUMO E3 Ligases in Signaling Pathway of Cancer Cells.

Small ubiquitin-like modifier (SUMO)ylation is a reversible post-translational modification that plays a crucial role in numerous aspects of cell physiology, including cell cycle regulation, DNA damage repair, and protein trafficking and turnover, which are of importance for cell homeostasis. Mechanistically, SUMOylation is a sequential multi-enzymatic process where SUMO E3 ligases recruit substrates and accelerate the transfer of SUMO onto targets, modulating their interactions, localization, activity, or stability. Accumulating evidence highlights the critical role of dysregulated SUMO E3 ligases in processes associated with the occurrence and development of cancers. In the present review, we summarize the SUMO E3 ligases, in particular, the novel ones recently identified, and discuss their regulatory roles in cancer pathogenesis.

Three Mycogone Species, Including a New Species, Cause Wet Bubble Disease of Agaricus bisporus in China.

White button mushroom, Agaricus bisporus (Lange) Imbach, is the most extensively cultivated and edible mushroom worldwide. The production of A. bisporus is commonly affected by wet bubble disease (WBD), imposing a significant economic burden in China. Although studies have shown that this disease is caused by fungi of the Mycogone genus, the pathogen has not been fully characterized. In this study, 802 samples of diseased fruiting bodies of A. bisporus were collected from nine major mushroom-cultivating provinces in China, yielding a total of 586 Mycogone isolates. The morphologic characteristics of these isolates were observed and compared, and multilocus phylogenetic analyses (internal transcribed spacer [ITS], ACT, TEF1-α, TUB, RPB2, and large ribosomal subunit [LSU]) were performed on the selected representative isolates. Three Mycogone species were identified: a new species, M. xinjiangensis; M. perniciosa; and M. rosea. Mycogone rosea was the first ever reported in China. Furthermore, M. rosea was found to be the most prevalent species (54.95% of all isolates) in all the sampled areas, except in Hubei and Xinjiang, followed by M. perniciosa (39.93%) and M. xinjiangensis (5.12%). Pathogenicity tests on the fruiting body and mushroom bed substantiated Koch's postulates by the development of mildly different symptoms after inoculation with each species. This study, therefore, enhances our knowledge of the species associated with WBD in A. bisporus and provides useful insights for preventing WBD and allied diseases.

Evaluating the Sensitivities and Efficacies of Fungicides with Different Modes of Action Against Phomopsis asparagi.

Asparagus stem blight caused by Phomopsis asparagi is a major hindrance to asparagus production worldwide. Currently, fungicides are used to manage the disease in commercial production, but resistance to common fungicides has emerged in the wild population. In the present study, 132 isolates of P. asparagi collected from different provinces in China were tested for sensitivities to pyraclostrobin, tebuconazole, and fluazinam. We also determined the efficacies of six fungicides against P. asparagi. The frequency distributions of EC50 values of the isolates tested were unimodal, but the curves for pyraclostrobin and tebuconazole had long right-hand tails. The mean EC50 values for pyraclostrobin, tebuconazole, and fluazinam were 0.0426 ± 0.0029, 0.6041 ± 0.0416, and 0.0314 ± 0.0013 µg/ml, respectively. In addition, the EC50 values for pyraclostrobin were very similar with or without salicylhydroxamic acid (SHAM), 20 µg/ml, indicating that SHAM is not needed to determine the sensitivity of P. asparagi to pyraclostrobin when using the mycelial growth inhibition assay. In greenhouse assays, Merivon (42.4% fluxapyroxad plus pyraclostrobin SC), Frown-cide (500 g/liter fluazinam SC), Cabrio (250 g/liter pyraclostrobin EC), and Nativo (75% trifloxystrobin plus tebuconazole WG) showed excellent preventive efficacy against P. asparagi. And these fungicides were more effective before inoculation than when they were applied after inoculation (P < 0.05). Therefore, these fungicides should be applied prior to infection to control stem blight. In field trials, Frown-cide, Merivon, Nativo, and Cabrio also performed good control effects, ranging from 75.2 to 86.0% in 2017 and 75.4 to 87.1% in 2018. We demonstrated that Frown-cide, Merivon, Nativo, and Cabrio had considerable potential to manage asparagus stem blight. In addition, rotations of these fungicides are essential for precluding or delaying the development of resistance and for controlling the disease.

Characterization of Natural Isolates of Bipolaris maydis Associated with Mating Types, Genetic Diversity, and Pathogenicity in Fujian Province, China.

Due to the natural destructiveness and persistence of the southern corn leaf blight (SCLB) fungus Bipolaris maydis (Nisikado et Miyake) Shoem, the characterization of B. maydis field isolates is essential to guide the rational distribution of resistant materials in corn-growing regions. In the present study, 102 field isolates collected from seven locations covering the entire region of Fujian Province, China, were assessed for mating type distribution, genetic diversity, and pathogenicity toward local sweet corn cultivars. Mating type detection via polymerase chain reaction indicated that 36.3 and 63.7% of isolates were MAT1-1 and MAT1-2, respectively; more than 80% of these isolates were confirmed using cross assays with known mating type isolates. Thirteen intersimple sequence repeat (ISSR) markers within and among two mating type populations revealed a high level of DNA polymorphism for all combined isolates and between MAT1-1 and MAT1-2 populations. The MAT1-2 population was more diverse based on DNA polymorphism than the MAT1-1 population. The value of GST was 0.0070, ranging from 0.0399 to 0.3044 based on analysis of combined isolates and individual regional populations, respectively, suggesting the presence of genetic differentiation in the two mating type populations from different locations. Pathogenicity assays revealed that both MAT1-1 and MAT1-2 populations were pathogenic to all 11 local sweet corn cultivars tested in this study. The potential of sexual reproduction, existence of genetic diversity in the two mating type populations, and pathogenicity suggest that B. maydis populations have independently clonally adapted under natural field conditions during corn cultivation.

Pseudoperonospora cubensis in China: Its sensitivity to and control by oxathiapiprolin.

The novel fungicide oxathiapiprolin has potential for the control of downy mildew of cucumber, which is caused by Pseudoperonospora cubensis. In this study, an in vitro bioassay with detached leaves was used to determine the baseline sensitivity to oxathiapiprolin for 77 Ps. cubensis isolates from 11 provinces in China. The baseline sensitivity curve was continuous, and the average EC50 value was 2.23 × 10-4 µg ml-1. In field trials, the control of downy mildew of cucumber was greater with oxathiapiprolin at 20 or 30 g a.i. ha-1 than with dimethomorph at 262.5 g a.i. ha-1. Oxathiapiprolin was taken up by cucumber roots and transported upwards to stems and leaves. The full length of PscORP1, the gene that encodes the target protein of oxathiapiprolin in Ps. cubensis, was sequenced for the first time. Our results suggested that oxathiapiprolin will be an excellent alternative fungicide for control of cucumber downy mildew. However, as Ps. cubensis is a high-risk pathogen, resistance development to oxathiapiprolin should be monitored and managed.

Effects of Illness Perception and Coping Style on Self-Management in Peritoneal Dialysis Patients: A Cross-Sectional Study.

Aim: Chronic disease self-management is critical to disease prognosis and patient quality of life. Several psychological factors influence this process of self-management. In this background, the present study investigated the impact of illness perceptions and coping style on self-management in people with peritoneal dialysis (PD). Methods: The study is a cross-sectional study. From May 2022 to January 2023, a convenience sampling method was used to recruit 246 peritoneal dialysis patients. General information questionnaire, brief illness perception questionnaire, medical coping style modes questionnaire and the self-management scale for peritoneal dialysis patients were used in this study. We used SPSS 24.0 to analyze the data, and the statistical methods included descriptive analysis, single factor analysis, Pearson correlation analysis and multiple linear regression analysis. Results: A total of 246 patients were included in this study (93.89% response rate). Cognitive representations and emotional representations were 30.40, 14.18, respectively. However, illness comprehensibility was 2.87. Illness perceptions were negative significantly correlated with self-management. With regard to coping style, our patients were more likely to adopt avoidance and resignation coping style. Confrontation and avoidance were positively related to self-management, while acceptance-resignation was negatively related. Conclusion: Self-management of peritoneal dialysis patients needs to be improved. Age, female sex, monthly income, illness perceptions and coping style were independently associated with self-management. Impact: These findings suggest that interventions that improve illness perceptions and coping style should be explored to ultimately improve their self-management. For example, patients can be provided with psychological counseling so that they can face the disease correctly, and we should pay attention to the positive role of social support.

GATA4 regulates the transcription of MMP9 to suppress the invasion and migration of breast cancer cells via HDAC1-mediated p65 deacetylation.

GATA-binding protein 4 (GATA4) is recognized for its significant roles in embryogenesis and various cancers. Through bioinformatics and clinical data, it appears that GATA4 plays a role in breast cancer development. Yet, the specific roles and mechanisms of GATA4 in breast cancer progression remain elusive. In this study, we identify GATA4 as a tumor suppressor in the invasion and migration of breast cancer. Functionally, GATA4 significantly reduces the transcription of MMP9. On a mechanistic level, GATA4 diminishes MMP9 transcription by interacting with p65 at the NF-κB binding site on the MMP9 promoter. Additionally, GATA4 promotes the recruitment of HDAC1, amplifying the bond between p65 and HDAC1. This leads to decreased acetylation of p65, thus inhibiting p65's transcriptional activity on the MMP9 promoter. Moreover, GATA4 hampers the metastasis of breast cancer in vivo mouse model. In summary, our research unveils a novel mechanism wherein GATA4 curtails breast cancer cell metastasis by downregulating MMP9 expression, suggesting a potential therapeutic avenue for breast cancer metastasis.

Quantitative evaluation of traditional Chinese medicine development policy: A PMC index model approach.

Background: Traditional Chinese medicine development policies (TCMDPs) are essential in improving the sustainable development of TCM undertakings, of which transmissions of policy information are closely related to the actual policy effectiveness. However, the inherent components of TCMDPs had not been explored from the structural dimension of policy design. Methods: Based on the policy modeling consistency (PMC) index model, we constructed a comprehensive evaluation system, including ten first-level and 40 second-level indicators, and focused on the TCMDPs released by the Chinese central government in the past 42 years (1980-2022) to conduct multi-dimensional inspections to TCMDPs by analyzing the overall policy quality, individual scoring performance, and indicators distribution characteristics. Results: This study pointed out that four policies were rated as "perfect," 35 were rated as "superb," 50 were rated as "excellent," 28 were rated as "good," and four were rated as "acceptable," with total mean values of the PMC index being 7.530 ± 0.835. Although most TCMDPs had appropriate policy structure and consistency, the potential weaknesses in the design of TCMDPs also needed our attention through careful checks on the outlier policy samples. Besides, the existing TCMDPs had room for improvement regarding policy areas, guarantees and incentives, objects included, and issuing agencies. Conclusions: We emphasized that the policy evaluation method used in this current study, the PMC index model, is scarce in the TCMDPs. These findings are helpful for fully understanding the strengths and weaknesses of TCMDPs and provide theoretical references for further studies optimizing TCMDPs.

Analysis of the prochloraz-Mn resistance risk and its molecular basis in Mycogone rosea from Agaricus bisporus.

BACKGROUND: Wet bubble disease (WBD), caused by Mycogone rosea, is one of the most serious diseases of white button mushroom (Agaricus bisporus) in China. Prochloraz-Mn is the main fungicide used in the management of WBD. To provide essential references for early warning of prochloraz-Mn resistance and management of WBD, this study was performed to assess the resistance risk to prochloraz-Mn in M. rosea, as well as its underlying resistance mechanism. RESULTS: Eight stable prochloraz-Mn-resistant mutants with a mutation frequency of 1.3 × 10-4 were generated and resistance factors ranged from 2.57 to 7.80 after 10 successive culture transfers. All eight resistant mutants exhibited fitness penalties in decreased sporulation and pathogenicity. Positive cross-resistance was observed between prochloraz-Mn and prochloraz or imazalil, but not between prochloraz-Mn and diniconazole, fenbuconazole, thiabendazole or picoxystrobin. The point mutation F511I in MrCYP51 protein was found in six mutants and the point mutation G464S occurred only in the SDW2-2-1M mutant. The up-regulated expression of MrCYP51 in all mutants was less than that in their parental isolates when exposed to prochloraz-Mn. Without prochloraz-Mn treatment, MrCYP51 expression was up-regulated in GX203-3-1M and FJ58-2-1M mutants, whereas it was down-regulated in other mutants compared to their respective parental isolates. CONCLUSION: Genotypes with two separate point mutations, F511I and G464S in MrCYP51, may be associated with resistance to prochloraz-Mn in M. rosea. The resistance risk of M. rosea to prochloraz-Mn is likely to be low to moderate, indicating that prochloraz-Mn can still be used reasonably to control WBD. © 2021 Society of Chemical Industry.

Circ_ANKIB1 stabilizes the regulation of miR-19b on SOCS3/STAT3 pathway to promote osteosarcoma cell growth and invasion.

Osteosarcoma is a highly malignant tumor. The molecular mechanism of its occurrence and development has not yet been clarified. Current studies have found that noncoding RNAs, such as circular RNAs (circRNAs) and microRNAs (miRNAs), play important regulatory roles in the progression of diseases. Our previous studies have shown that miR-19b is an oncogene in osteosarcoma. Further studies have shown that circ_ANKIB1 has binding sites for miR-19b, and both molecules were generally upregulated in osteosarcoma cells. RIP assay, RNA pull down, and dual-luciferase reporter gene assay showed that circ_ANKIB1 could directly bind to miR-19b and act as an miR-19b sponge in osteosarcoma cells. Circ_ANKIB1 promoted miR-19b expression, inhibited the expression of the downstream target gene SOCS3, and then activated the STAT3 pathway. When cotransfected with circ_ANKIB1 siRNA, and miR-19b mimics, the expression of SOCS3 and the phosphorylation level of STAT3 did not change significantly. Continuous detection of cell growth and invasion showed that the downregulation of circ_ANKIB1 or miR-19b significantly inhibited cell proliferation and invasion, but increased the apoptotic level. When cotransfected with circ_ANKIB1 siRNA and miR-19b mimics or SOCS3 siRNA, the cell proliferation, apoptosis, and invasion levels did not change significantly, suggesting that circ_ANKIB1 could affect the STAT3 pathway and osteosarcoma cell growth and invasion by enhancing the regulation of miR-19b on the downstream target gene SOCS3. These findings suggest that circRNAs stabilize miRNA functions, and further studies on this new function of circRNAs will provide a meaningful reference for the diagnosis and treatment of tumors and other diseases.

[Biological effects of root exudates from resistant and susceptible banana varieties on Fusaiurm oxysporum f. sp. cubense and Bacillus subtilis]. / 香蕉抗(感)ç— å“ç§æ ¹ç³»åˆ†æ³Œç‰©å¯¹æž¯èŽç— èŒå’Œæž¯è‰èŠ½å­¢æ†èŒçš„ç”Ÿç‰©æ•ˆåº”.

Root exudates of banana resistant variety ('Nantianhuang') and susceptible variety ('Guijiao No. 6') to Fusarium wilt were collected in vitro by bathing root system to examine the biological effects of root exudates from banana varieties on Fusaiurm oxysporum f. sp. cubense and Bacillus subtilis. We explored the effects of root exudates of different banana varieties on the abundance of soil microorganisms and the growth of F. oxysporum f. sp. cubense and B. subtilis. The results showed that root exudates from resistant variety could significantly reduce the abundance of soil fungi and inhibit the spore germination of F. oxysporum f. sp. cubense. Root exudates from susceptible variety could significantly stimulate mycelia growth and spores germination, whereas root exudates from the tested banana varieties could significantly increase the growth and biofilm formation of B. subtilis. By dealing with the root exudates of resistant and susceptible varieties, the growth rate of mycelia were 11.28 and 12.28 mm·d-1, and the germination rate of spores were 34.6% and 79.5%, respectively. After culturing for 12 h, the growth rates of B. subtilis (OD600) were 1.27 and 1.14, and the biofilm formation (OD570) were 1.11 and 1.30 after static culturing 72 h, respectively. There were significant differences between the values of resistant and susceptible varieties. The colonization amount of B. subtilis in the rhizosphere of susceptible variety was significantly higher than that of resistant variety. The contents of free amino acids and organic acid in root exudates of the resistant variety were higher than that of susceptible variety. The content ratio of acetic acid and proline in the root exudates of resistant variety were 3.7 times and 2.4 times of that of susceptible variety. In conclusion, root exudates of banana resistant variety could inhibit the growth of F. oxysporum f. sp. cubense. Root exudates from susceptible variety could promote the growth of F. oxysporum f. sp. cubense,while that from the tested banana varieties could all significantly enhance growth, biofilm formation and colonization ability of B. subtilis.

Three point-mutations in cytochrome b confer resistance to trifloxystrobin in Magnaporthe oryzae.

BACKGROUND: Rice blast, caused by Magnaporthe oryzae, is the most devastating disease in rice. Recently, trifloxystrobin was registered for the control of M. oryzae in China. The resistance profile and mechanism of M. oryzae to trifloxystrobin were investigated in the present study, providing important data for the recommended use of trifloxystrobin. RESULTS: The baseline sensitivity was established at a half maximal effective concentration (EC50 ) of 0.024 µg mL-1 . Nine stable trifloxystrobin-resistant mutants were generated with EC50 values ranging from 12.75 to 171.49 µg mL-1 . The mutants exhibited strong adaptive traits in sporulation, conidial germination, and pathogenicity. Positive cross-resistance was only observed between trifloxystrobin and azoxystrobin, but not between trifloxystrobin and carbendazim, isoprothiolane, prochloraz, or chlorothalonil. The point mutation G143S in cytochrome b (cyt b) protein was found in eight high-resistance mutants with resistant factor ranging from 2295.16 to 13 200.00; and the double mutation G137R/M296V only occurred in Mg117-1 with resistance factor ≈ 900. The G143S mutation weakened hydrogen bond interactions, and G137R/M296V changed the conformation of trifloxystrobin in the cyt b binding pocket. A molecular detection method was established for the rapid detection of G143S mutants in M. oryzae. CONCLUSION: The resistance risk of M. oryzae to trifloxystrobin could be moderate to high. Two genotypes with three point-mutations G143S, G137R, and M296V conferred resistance to trifloxystrobin in M. oryzae. © 2020 Society of Chemical Industry.

Development of a dendrimer PAMAM­based gold biochip for rapid and sensitive detection of endogenous IFN­Î³ and anti­IFN­Î³ IgG in patients with hemophagocytic lymphohistiocytosis.

Hemophagocytic lymphohistiocytosis (HLH) is a rare but severe disease characterized by immune hyperactivation and cytokine storm. Given the high mortality rate of HLH, there is a need for more effective diagnostic tools and treatments. The present study developed a dendrimer­based protein biochip for rapid, sensitive and simultaneous detection of serum interferon (IFN)­Î³ and endogenous anti­IFN­Î³ antibody (Ab) in patients with HLH. A gold biochip was modified with 1, 4­phenylene diisothiocyanate (PDITC), polyamidoamine (PAMAM) or PDITC­activated PAMAM. The optimal immobilization concentration for Ab capture and the reaction concentration for detecting Ab on the PDITC­activated PAMAM­modified biochip were 6.25 and 3.12 µg/ml, respectively; the limit of detection of IFN­Î³ protein was 50 pg/ml. The efficiency of the protein­probed biochip in detecting IFN­Î³ and anti­IFN­Î³ Ab in serum samples from 77 patients with HLH was evaluated; the positive rates for IFN­Î³ and anti­IFN­Î³ IgG Ab were 63.6% (49/77) and 61.0% (47/77), respectively. The present results demonstrated that the PDITC­activated PAMAM­modified biochip might be a sensitive tool for the specific detection of IFN­Î³ and anti­IFN­Î³ Ab in serum, and might have clinical applicability for the diagnosis of HLH.

[Effect of minimally invasive plate osteosynthesis through two approaches on bone metabolic activity and radial nerve injury in patients with humeral midshaft fracture].

OBJECTIVE: To compare application of minimally invasive plate osteosynthesis (MIPO) through two approaches for patients with humeral midshaft fracture, and analyzes the effect on bone metabolic activity and radial nerve injury. METHODS: From April 2014 to May 2017, 76 patients with humeral midshaft fracture treated by MIPO were selected and randomly divided into group A (anterior approache group) and group B (lateral approach group) according to random number stable. In group A, there were 38 patients including 22 males and 16 females, aged from 18 to 74 years old with an average age of(48.21±5.79) years old; 24 patients were caused by traffic accidents, 6 patients were caused by heavy object crushing, 8 patients were caused by falling down; 20 patient were on the right side, 18 patients were on the left side; 15 patients were type A, 17 patients were type B, 6 patients were type C according to AO classification; the patients were treated by MIPO through anterior approach. In group B, there were 38 patients including 23 males and 15 females, aged from 20 to 73 years old with an average age of(48.40±5.81) years old; 26 patients were caused by traffic accidents, 5 patients were caused by heavy object crushing, 7 patients were caused by falling down; 17 patients were on the right side, 21 patients were on the left side; 15 patients were type A, 18 cases were type B, 5 cases were type C according to AO classification; the patients were treated by MIPO through lateral approach. Intraoperative blood loss, operative time, hospital stays, fracture healing time between two groups were compared. Bone gla protein (BGP), collagen C-terminal peptide (CTX) and osteoprotegerin (OPG) were tested before and after operation. The incidence of radial nerve injury after operation was observed. RESULTS: All patients were followed-up from 12 to 18 months with an average of (15.4±2.1) months. There were no statistical differences in operative time, intraoperative blood loss between two groups. Hospital stays, fracture healing time in group A were(6.52±1.81) d, (13.27±3.01) weeks respectively, while in group B were(9.61±1.99) d, (14.83±3.08) weeks; and had differences between two groups. There were no differences in BGP, OPG and CTX, BGP between two groups and OPG in group A at 1 month after operation were(7.10±0.58) ng/ml, (173.67±9.12) pg/ml and higher than that of group B(6.63±0.62) ng/ml, (152.80±9.23) pg/ml; while CTX in group A (224.52±12.67) µg/ml was lower than that of group B(259.13±13.54) µg/ml(P<0.05). No patient occurred radial nerve injury in group A, 4 patients occurred radial nerve injury in group B, and had statistical differences between two groups(χ²=4.220, P<0.05). CONCLUSIONS: Compared with lateral approach, anterior approach has much more effective in minimally invasive MIPO for humeral shaft fractures, which could improve bone metabolism and reduce risk of radial nerve injury.

Succinyl-ß-cyclodextrin modified gold biochip improved seroimmunological detection sensitivity for Lyme disease.

Cyclodextrin (CD) is a kind of cyclic oligosaccharides, which forms host-guest interactions with hydrophobic molecules and is widely applied in capillary electrophoresis and pharmaceutical engineering. In this study, we established a succinyl-ß-CD modified gold biochip for improvement of seroimmunological detection sensitivity of Lyme disease. We found that the CD modified biochip platform presented a stronger affinity property for VlsE protein in conjugation with >0.000475 µg/mL of antigen immobilization concentration, which was sensitive enough for fluorescence based assay. Detection limit for anti-VlsE IgG antibody was 0.39 µg/mL. Specificity of VlsE assay on the succinyl-ß-CD modified biochip was successfully confirmed by an immunological block assay. Furthermore, the correlation coefficient (R2) between the fluorescence values by the biochip and the OD values by ELISA assay was 0.904, indicating this biochip-based immunological assay might be a potential substitute with the ELISA-based approach. This biochip platform would be not suitable for loading of flagellin and OspC.