The impact of the pandemic, caused by SARS-CoV-2, on the management of malignancies has posed several challenges. Gestational trophoblastic diseases, being considered highly curative, are categorized as emergent cases which need immediate intervention with a level I priority for chemotherapy for its malignant spectrum. These guidelines have been drawn up to assist in decision-making and the implementation of such are dependent on the capabilities of each institution combined with their local experience.

Objective The physiological and biochemical changes were studied during the Panax notoginseng′s fruit development.Methods Dynamic changes of fruits size,fresh and dry weight,moisture content and soluble sugar,starch and protein contents were investigated.Results The moisture content was increased first and then dropped to 73.37% at maturity.The fresh and dry weight,starch and protein contents of P.notoginseng′s fruits were increased with the fruit development.The soluble sugar content was raised first,then decreased,and increased slightly at the lateral stage of fruit development.Conclusion The P.notoginseng′s fruits are mature at 80 d after peak anthesis;the decrease of moisture content is companied with the gradual increasing of fruit fresh and dry weight during the fruit development.The storage and utilization of nutrients in P.notoginseng′s fruits are closely related with the fruit development.

Objective To develop and verify a plaque method for detection of infectious titer of tick-borne encephalitis virus(TBEV)strain(PHKT strain for short)adapted to primary hamster kidney(PHK)cells.Methods PHK cells were infected with TBEV,a primary mouse brain adaption strain,and passed consecutively for 12 passages.The titer of PHKT was detected by plaque method(Monolayer BHK-21 cells were infected with PHKT of various passages at different dilution ratios,and the plaque number was calculated by neutral red staining)and challenge titration in mouse brain(Mice were challenged with PHKT of various passages at different dilution ratios through brain cavity,0.03 mL for each,observed continuously for 14 days,and calculated for the median lethal dose(LD50)by Reed-Muench method)respectively,and the correlation between the results of two methods was analyzed.The developed plaque method for the detection of TBEV titer was verified for specificity,repeatability and intermediate precision.Results The plaque titer of PHKT virus was up to8.9 lgPFU/mL;The correlation between the results of plaque method and mouse brain challenge titration method was good(r = 0.92);The specificity of plaque method for detecting infectious titer of PHKT virus was good,and the coefficients of variation(CVs)of repeatability and intermediate precision were both less than 5%.Conclusion A plaque method for detecting infectious titer of PHKT virus was developed,which may be used as an alternative method for challenge titration in mouse brain.

Objective To screen enterohemorrhagic Escherichia coli(EHEC) strain and declare it as a standard strain of China Medical Bacterial Species Conservation and Management Center(CMCC).On the base,to prepare strain reference and genomic DNA reference of EHECand declare them as national drug reference with independent intellectual property rights in our country.Methods According to GB4789.6-2016 National Food Safety Standards-Food Microbiology TestDiarrheagenic Escherichia coil Test,the EHEC strain was screened from 160 Escherichia coli strains from patients with diarrhea and declared as a standard strain of CMCC according to management regulations.EHEC bacterial solution and genomic DNA solution were prepared,and freeze-drying technology was used to prepare 600 strain(10~3 CFU/sample) and genomic DNA(20 ng/sample) samples respectively.20 strain and 20 genomic DNA samples were randomly selected for uniformity test.Samples storing at 25 ℃ and 37 ℃ for 1,3,5 and 7 d were taken respectively to test the transportation stability.Then the samples were tested for the short-term storage stability by storing at 4 ℃ for 7,14 and 28 d,and for the long-term storage stability by storing at 20 ℃ for 14,28 and 60 d.Three laboratories were organized for collaborative calibration.20 food products were chosen as the substrate to evaluate the application effect of strain samples.Results The one EHEC strain selected from 160 Escherichia coli strains from patients was finally declared as the CMCC(B) 43207standard strain.In the uniformity test,F_(strainsample)=0.662 0.05,and eae,stxl and stx2 of 20genomic samples were all positive.After storage at 25 and 37 ℃ for 7 d,-20 ℃ for 60 d and 4 ℃ for 28 d,the viable bacteria content of the strain samples was still 103 CFU/sample,and eae,stxl and stx2 of the genomic samples were positive.EHEC strains and genomic DNA samples selected randomly were identified as EHEC by three laboratories,the viable bacteria content was 10~3 CFU/sample,and eae, stxl and stx2 were all positive.It was detected in 20 kinds of food substrates after adding samples,but not in the background control.EHEC strain and the genomic DNA sample were included in drug standard materials in our country,numbered 80024 and 80056,respectively.Conclusion The prepared EHEC strain and genomic DNA standard materials with independent intellectual property rights can improve the timeliness of EHEC testing and make up for the gap in our country.

Objective To screen and optimize the formulation and technology of human recombinant neutrophil inhibitory factor and hirulog hybrid(TNHH)for injection,and investigate its stability.Methods Based on the results of the single factor experiment,with the pH range,mannitol dosage and povidone K30 dosage as independent variables,and the content of high molecular protein as response value,the response surface design(CCF)test was used to analyze the effects of the respective variables and their interaction on the content of high molecular protein in TNHH for injection to screen out the optimal formulation. In order to facilitate the operation,the optimal formulation was adjusted to prepare three batches of samples in pilot scale,which were placed at 40 ℃,75% relative humidity(RH)for 2,4 weeks and 2 ～ 8 ℃ for 3,6 months,respectively. The samples were taken and the appearance,pH,purity of reversed phase-high performance liquid chromatography(RP-HPLC)and purity of size exclusion chromatography-high performance liquid chromatography(SECHPLC)were detected to verify the stability of this formulation and process.Results The optimal formulation was pH 4. 982 6,mannitol 7. 986 4% and povidone K30 1. 902 7%,which was finally adjusted to pH 5. 0,mannitol 8. 0% and povidone K302. 0%. The TNHH preparation for injection prepared by the optimized prescription and process were stable in quality and met the clinical medication requirements.Conclusion The optimum formulation of TNHH preparation for injection is reasonable in the process and suitable for industrial production.

The electrocardiograph is used to record the bioelectric signals generated by the activation of myocardium when the heart is active. It is a commonly used medical electronic instrument for clinical diagnosis and first-aid. However, electrocardiograph adopts a lead wire connection method in existing technology, which is prone to interweaving of wires during movement. It will not only break and wear the lead wire, but also delay the treatment time due to the cleaning of the lead wire. In addition, because the battery capacity is small, it needs to be charged frequently after use, which affects the speed of the instrument use and first-aid. Moreover, the original adsorbed chest lead electrode has a small contact surface with the skin, leading to less comfort and easy to fall off. In order to solve the above problems, an electrocardiograph without lead wire for first-aid was designed by medical staff of Tianjin First Central Hospital, and the National Utility Model Patent of China was obtained (Patent No.: ZL 2019 2 2267837.3). The electrocardiograph adopts the method of wirelessly connecting electrodes, avoids entanglement of lead wire, and increases the portable power source, which prolongs the battery endurance time, improves the contact electrode performance of chest lead and increases the contact surface, the above improvements optimize the medical process operated by medical staff, which is more conducive to clinical first-aid and routine examination, and has the advantages of easy to use, easy to carry and strong safety.

Normal cell cycle includes cell division,differentiation,apoptosis or pyroptosis,which are regulated by many regulatory proteins. Epigenetic mechanisms such as DNA methylation and histone modification in specific genes or the whole genome,as well as non-coding RNAs(ncRNAs),play an important role in the cell cycle. The changes of these mechanisms lead to cell cycle imbalance,cell growth disorder,epigenetic modification abnormality,and the possibility of normal cells developing into tumor cells,which is one of the important causes for human tumor occurrence. In this paper,the epigenetic regulation in cell cycle,abnormal epigenetic mechanism and cell cycle regulation in tumors,and the therapeutic targets of epigenetic regulation related to tumor cell cycle have been reviewed,so as to provide new ideas for further exploring the correlation between epigenetic mechanism and cell cycle regulation,as well as the mechanism of tumorigenesis.

Tumor microenvironment(TME) is the product of the interaction of different cell types, which plays a crucial role in the occurrence and development of tumors. Therefore, it is an essential intrinsic part in the regulation of the occurrence,development, invasion and metastasis of hepatocellular carcinoma(HCC). Competing endogenous RNAs(ceRNAs), as an emerging component of tumor-host interaction, can participate in the infiltration and differentiation of immune cells by regulating the interactions between different types of RNAs. However, the regulatory mechanism between ceRNA network and TME in HCC is complex and uncertain. In this review, we focus on how the ceRNA network in TME promotes HCC,including tumor invasion and metastasis, angiogenesis, immune regulation and fibrosis, so as to clarify the specific role of ceRNA in the development of HCC.

Protein tyrosine kinase 6(PTK6)is a non-receptor tyrosine kinase,which plays a key role in the genesis and progression of various tumors and shows a dual role.MicroRNAs(miRNAs)are small non-coding RNAs that regulate the expression of post-transcriptional genes.In recent years,more and more studies have shown that the regulation of PTK6 by miRNA plays an important role in tumor.This paper illustrates the effect of miRNA on PTK6 expression in various cancers so as to provide theoretical basis for cancer treatment.

Objective Seek countermeasures against the debt risk in universities. Methods Taking the debts of Kunming Chenggong universities construction as an example, analyze the reasons and countermeasures for the debts of universities in Yunnan province. Results Due to the enrollment expansion policy, the higher education in Yunnan province has been transformed from the elite education into mass education. The universities in Kunming have gained unprecedented development opportunities,especially with the completion of the Kunming Chenggong University Town. However, loan funds for the new campus construction mostly came from banks. So,the huge debt stress from banks has been brought with the development of the universities. Conclusion The sustainable development of universities requires the moderate debt. The government, universities and society need to work together to control the scale of debt effectively and avoid the debt crisis.