ObjectivePhotoacoustic pump-probe imaging can effectively eliminate the interference of blood background signal in traditional photoacoustic imaging, and realize the imaging of weak phosphorescence molecules and their triplet lifetimes in deep tissues. However, background differential noise in photoacoustic pump-probe imaging often leads to large fitting results of phosphorescent molecule concentration and triplet lifetime. Therefore, this paper proposes a novel triplet lifetime fitting method for photoacoustic pump-probe imaging. By extracting the phase of the triplet differential signal and the background noise, the fitting bias caused by the background noise can be effectively corrected. MethodsThe advantages and feasibility of the proposed algorithm are verified by numerical simulation, phantom and in vivo experiments, respectively. ResultsIn the numerical simulation, under the condition of noise intensity being 10% of the signal amplitude, the new method can optimize the fitting deviation from 48.5% to about 5%, and has a higher exclusion coefficient (0.88>0.79), which greatly improves the fitting accuracy. The high specificity imaging ability of photoacoustic pump imaging for phosphorescent molecules has been demonstrated by phantom experiments. In vivo experiments have verified the feasibility of the new fitting method proposed in this paper for fitting phosphoometric lifetime to monitor oxygen partial pressure content during photodynamic therapy of tumors in nude mice. ConclusionThis work will play an important role in promoting the application of photoacoustic pump-probe imaging in biomedicine.

Isoliquiritigenin (ISL) is a chalcone compound isolated from licorice, known for its anti-diabetic, anti-cancer, and antioxidant properties. Our previous study has demonstrated that ISL effectively lowers blood glucose levels in type 2 diabetes mellitus (T2DM) mice and improves disturbances in glucolipid and energy metabolism induced by T2DM. This study aims to further investigate the effects of ISL on alleviating abnormal endoplasmic reticulum stress (ERS) caused by T2DM and to elucidate its molecular mechanisms. In vivo experiments were conducted using 8-week-old SPF male C57BL/6J mice. The T2DM animal model was established by high-fat and high-sugar diet combined with intraperitoneal injections of streptozotocin (STZ), in compliance with the ethical guidelines set by the Animal Welfare Committee of Beijing University of Chinese Medicine (approval number: BUCM-2022021503-1134). In vitro experiments employed human liver cancer HepG2 cells, which were induced with tunicamycin (TM) to establish the ERS cell model. Transcriptomic sequencing was used to analyze changes in gene expression in the liver samples of T2DM mice following ISL treatment. Real-time quantitative polymerase chain reaction (RT-qPCR) was employed to assess the regulatory effects of ISL on key ERS genes. Enzyme-linked immunosorbent assay (ELISA), Western blot (WB), and immunofluorescence techniques were used to evaluate ISL's effects on ERS-related proteins. Results indicate that ISL significantly downregulates the expression of ERS-related genes, reduces the level of glucose-regulated protein 78 (GRP78), and inhibits the phosphorylation of protein kinase RNA-like endoplasmic reticulum kinase (PERK), thereby alleviating abnormal ERS induced by T2DM. Additionally, ISL increases the protein levels of insulin receptor substrate (IRS) 1 and IRS2 and enhances the phosphorylation of protein kinase B (Akt), thereby improving insulin sensitivity. In conclusion, ISL is able to alleviate T2DM associated symptoms by improving abnormal ERS and enhancing insulin sensitivity.

A derivatizaton method combined with gas chromatography-mass spectrometry(GC-MS)was established for detection of isobutyl chloroformate(IBCF)residue in active pharmaceutical ingredient of agatroban.The extraction and derivatization reagents,derivatization time,qualitative and quantitative ions were selected and optimized,respectively.The possible mechanism of derivatization and characteristic fragment ions fragmentation were speculated.The agatroban samples were dissolved and extracted by methanol,and the residual IBCF was derived with methanol to generate methyl isobutyl carbonate(MIBCB).After 24 h static derivatization at room temperature,IBCF was completely transformed into MIBCB,which could be used to indirectly detect IBCF accurately.The results showed that the linearity of this method was good in the range of 25-500 ng/mL(R2=0.9999).The limit of detection(LOD,S/N=3)was 0.75 μg/g,and the limit of quantification(LOQ,S/N=10)was 2.50 μg/g.Good recoveries(95.2%-97.8%)and relative standard deviations(RSDs)less than 3.1%(n=6)were obtained from agatroban samples at three spiked levels of IBCF(2.50,25.00,50.00 μg/g),which showed good accuracy of this method.Good precision of detection results was obtained by different laboratory technicians at different times,the mean value of spiked sample solution(25.00 μg/g)was 24.28 μg/g,and the RSD was 2.1%(n=12).The durability was good,minor changes of detection conditions had little effect on the results.Under the original condition and conditions with initial column temperature±5℃,heating rate±2℃/min,column flow rate±0.1 mL/min,the IBCF content of spiked sample solution(25.00 μg/g)was detected,the mean value of detection results was 24.16 μg/g,and the RSD was 2.2%(n=7).Eight batches of agatroban samples from two manufacturers were detected using the established method,and the results showed that no IBCF residue was detected in any of these samples.The agatroban samples could be dissolved by methanol,and then the IBCF residue could be simultaneously extracted and derived with methanol as well.This detection method had the advantages of simple operation,high sensitivity,low matrix effect and accurate quantification,which provided a new effective method for detection of IBCF residue in agatroban.

AIM To evaluate the quality of Beidougen Formula Granules.METHODS Fifteen batches of standard decoctions and three batches of formula granules were prepared,after which paste rate and contents,transfer rates of magnoflorine,daurisoline,dauricine were determined.HPLC specific chromatograms were established,and cluster analysis was adopted in chemical pattern recognition.RESULTS For three batches of formula granules,the paste rates were 15.1%-16.6%,the contents of magnoflorine,daurisoline,dauricine were 18.93-19.39,9.42-9.60,6.79-6.85 mg/g with the transfer rates of 34.42%-35.25%,43.81%-44.65%,27.27%-27.51%from decoction pieces to formula granules,respectively,and there were seven characteristic peaks in the specific chromatograms with the similarities of more than 0.95,which demonstrated good consistence with those of standard decoctions and accorded with related limit requirements.Fifteen batches of standard decoctions were clustered into two types,and the medicinal materials produced from Jilin,Hebei,Shangdong could be used for the preparation of formula granules.CONCLUSION This reasonable and reliable method can provide references for the quality control and clinical application of Beidougen Formula Granules.

Humans ; Aged ; Lung Diseases ; Pneumonia/drug therapy* ; Adrenal Cortex Hormones/therapeutic use* ; Pulmonary Disease, Chronic Obstructive/drug therapy* ; Administration, Inhalation ; Community-Acquired Infections/drug therapy*

This paper analyzes the pathogenesis, clinical characteristics, treatment measures and prognosis of a case of methemoglobin and hemolytic anemia caused by acute nitrogen trifluoride poisoning. The patient with occupational exposure to nitrogen trifluoride was treated immediately after the onset of illness, methemoglobin was monitored and a comprehensive examination was conducted. After comprehensive analysis, it was considered that acute nitrogen trifluoride poisoning could cause methemoglobinemia, hemolytic anemia and liver injury. The patient was disengaged and given symptomatic treatment such as oxygen therapy, methylene blue, low-dose methylpredrone, vitamin C and reduced glutathione. The prognosis of the patient is good, which provides a reference for the clinical treatment and occupational health examination of nitrogen trifluoride poisoning.

Objective A simple,sensitive and rapid ultra high performance liquid chromatography tandem mass spectrometry(UPLC-MS/MS)method was developed and validated for the determination of ertapenem in human plasma.Methods Using ertapenem-D4 as internal standard,the protein in plasma was precipitated with acetonitrile;chromatographic column:ACQUITY HSS T3(2.1 mm × 50.0 mm,1.8 μm);the mobile phase was 0.1％formic acid aqueous solution(containing 2 mmol·L-1 ammonium formate)-acetonitrile(0.1％formic acid),using a gradient elution;flow rate:0.4 mL·min-1,injection volume:1 μL,column temperature:45 ℃,the analysis time was 4.5 min,the scanning mode is positive ion selective reaction monitoring mode(SRM)with an electric spray ion source(ESI).The specificity,standard curve and lower limit of quantification,precision and recovery,matrix effect,dilution effect and stability were investigated.Results Ertapenem had a good linearity within 0.5-80.0μg·mL-1,and the standard curve was y=4.25 × 10-1x-2.64× 10-2(r2=0.999 0),the lower limit of quantification was 0.5 μg·mL-1,the relative standard deviation within and between batches is 1.39％-4.15％.The extraction recovery rate was 58.36％-64.57％,and the relative standard deviation of dilution effect was 3.30％,and the matrix effect was 99.71％-103.23％.The relative standard deviation of room temperature,repeated freeze-thaw,4 ℃,and long-term stability are all less than 10％.Conclusion The method is sensitive,rapid and specific,which is suitable for clinical monitoring of Ertapenem.

Objective To evalucate in vitro activity of cefcapene against clinical isolated pathogenic bacteria in recent three years in China.Methods The clinical isolates were collected and the minimal inhibitory concentrations(MICs)were determined by the microbroth dilution method.Results A total of 308 pathogenic bacteria over the period 2021-2023 were studied.Cefcapene exhibited excellent antibacterial activity against Streptococci and methicillin susceptible Staphylococcus aureus(MSSA),which was similar to penicillin and cefpodoxime,and better than cefuroxime,cefaclor and cefixime.Against gram-negative bacteria,cefcapene also showed better antibacterial activity,especially against non-extended spectrum β-lactamases(ESBLs)Escherichia coli,Haemophilus influenzae and Moraxella catarrhalis,were comparable to cefixime and cefpodoxime,better than cefuroxime and cefaclor.Conclusion Cefcapene showed excellent antibacterial activity against clinical isolates from community-acquired pneumonia,include streptococcus pneumonia,MSSA,Haemophilus influenzae and Moraxella catarrhalis in recent years in China,which identical with those reported in literature ten years ago in China and foreign.It is a highly effective oral cephalosporin suitable for adults and children with respiratory tract infection,otitis media,sinusitis,urinary tract infection and other outpatient infections.

Objective:To investigate the distribution and primary drainage sites of the venous drainage system in the pedicled nasal septal mucosal flap, as well as to examine protective measures for the venous system of the nasal septal mucosal flap and its application in repairing the nasal skull base through the anatomical study of the nasal septum mucosal venous system in cadavers.Methods:Gross anatomy dissections were performed on 13 sides perfused fresh frozen cadaveric head specimens. The nasal septum mucosal flap was separated along the perichondrium and subperiosteum, then passed across the vomer, anterior wall of sphenoid sinus, clivus, and towards the anterior edge of vertical plate of palatine bone. Detailed documentation, including photographs, was made to record the morphology, distribution and drainage location of veins of the nasal septum mucosal flap and its pedicle, along with number of sphenopalatine veins. Furthermore, venous injuries resulting from obtaining a pedicled nasal septal mucosa flap were observed. From March 2023 to March 2024, a retrospective analysis was conducted on patients with nasopharyngeal lesions who underwent surgical repair using a modified pedicled nasal septum mucosal flap for venous system protection in the ENT institute and Department of Otorhinolaryngology at the Eye & ENT Hospital of Fudan University. The postoperative endoscopy was employed to assess the viability of the mucosal flap.Results:The veins of the nasal septum mucosa were primarily located in the posterior region, including the vomerine region, anterior wall of the sphenoid sinus, clivus region, and posterolateral wall of the nasal cavity, in a reticular pattern. Perforating veins draining into these bony structures could be observed, although their quantity and morphology varied. Notably, no prominent sphenopalatine veins were identified in 10 specimens examined, while 3 specimens exhibited sphenopalatine veins: one with a small single branch and two with venous bundles. Preservation of the nasal septal vein was possible when dissection was limited to the anterior edge of the wing of vomer. A wider range of dissection increased the risk of veinous injury. In cases where only vascular pedicles at the sphenopalatine foramen were preserved, three cadaveric head specimens retained intact sphenopalatine veins, while drainage veins were completely destroyed in ten other specimens. Fifteen patients with unilateral lesions (8 with recurrent nasopharyngeal carcinoma and 7 with nasopharyngeal radionecrosis) were included in this study. The postoperative reconstructions were carried out using contralateral pedicled nasal septal mucosal flaps. The average follow-up time was 7 months (ranging from 3 to 12 months), and all the nasal septal mucosal flaps survived.Conclusions:The primary location of the drainage vein within the nasal septum mucosa is situated in its posterior region, where it penetrates into adjacent bone structures. Very few sphenopalatine veins pass through the sphenopalatine foramen. Extensive dissection of the pedicled nasal septal mucosal flap may potentially impair the venous system and adversely affect flap survival rates, necessitating further clinical exploration.

Statistical analysis was conducted on the quantity of Chinese medicine material and sliced herbal medicine,the species types and medicinal parts of Chinese medicine material and sliced herbal medicine,and the quantity and composition of Chinese patent medicines and single-herb preparations in Chinese Pharmacopoeia of the 2020 edition.The statistical results are available on the web site(http://itcm.hzau.edu.cn/yd/zgyd.htm)for reference.The analysis results showed that:(1)Chinese Pharmacopoeia(Part I)contained a total of 616 kinds of Chinese medicine material and sliced herbal medicine and 47 kinds of plant oils and extracts.The 616 kinds of Chinese medicine material and sliced herbal medicine originated from plants,animals,minerals,microorganisms,artificial or synthetic raw materials,human-sourced products,and products having the origin of both animal and plants.Of the 47 kinds of plant oils and extracts,46 were made from plant sources,and the remaining one,i.e.Cornu Bubali concentrated powder,was made from the animal sources.(2)A total of 421(73.60%)from the 616 kinds of Chinese medicine material and sliced herbal medicine originated from the single species,96(16.78%)originated from 2 kinds of species,40(6.99%)originated from 3 kinds of species,11(1.92%)originated from 4 kinds of species,2(0.35%)originated from 5 kinds of species,and 2(0.35%)originated from 6 kinds of species.Of the 47 kinds of plant oils and extracts,34 originated from the single species,5 originated from 2 kinds of species and 5 originated from 3 kinds of species.(3)The Chinese Pharmacopoeia(Part I)contained a total of 1 605 Chinese patent medicines and single-herb preparations.Except that the composition of Yunnan Baiyao Powder and Yunnan Baiyao Capsules was not issued,the remaining 1 603 types of Chinese patent medicines and single-herb preparations involved a total of 14 329 kinds of medicinal materials.The Chinese medicines with the leading 20 frequency used in the Chinese patent medicines and single-herb preparations recorded in the Chinese Pharmacopoeia of 2020 edition were Glycyrrhizae Radix et Rhizoma,Angelicae Sinensis Radix,Poria,Chuanxiong Rhizoma,Scutellariae Radix,Paeoniae Radix Alba,Astragali Radix,Citri Reticulatae Pericarpium,Rehmanniae Radix,Atractylodis Macrocephalae Rhizoma,Salviae Miltiorrhizae Radix et Rhizoma,Borneolum Syntheticum,Platycodonis Radix,Rhei Radix et Rhizoma,Rehmanniae Radix Preparata,Aucklandiae Radix,Carthami Flos,Ophiopogonis Radix,Codonopsis Radix and Angelicae Dahuricae Radix.The results suggest that there were still problems existing in Chinese Pharmacopoeia of the 2020 edition,i.e.,some of the drugs of Chinese patent medicines were not listed in the Chinese medicine material and sliced herbal medicine,and some of the prepared drugs of Chinese patent medicines were not listed in the Chinese medicine material and sliced herbal medicine,either.The systemic analysis of the general information of Chinese medicinal materials as well as their correlation with Chinese patent medicines in Chinese Pharmacopoeia will provide a reference for further research on the production of Chinese medicine material and sliced herbal medicine and the complete list of drugs in Chinese patent medicines.