ObjectiveTo carry out an epidemiological analysis on an outbreak of Mycoplasma pneumoniae infection at a welfare institution to provide a theoretical basis for the corresponding prevention and control measures. MethodsUsing the method of field epidemiological investigation， special field treatment was carried out in September 2022. Serum samples from cases and close contacts in the same ward area were collected for detection of nine respiratory tract infection pathogens （Mycoplasma pneumoniae， chlamydia， influenza， human metapneumosis， respiratory syncytial， human boca， parainfluenza type 1‒4 virus， and Middle East respiratory syndrome， severe acute respiratory syndrome coronavirus） by immunofluorescence immunoglobulin M （IgM） antibody test. ResultsA total of 14 Mycoplasma pneumoniae cases were identified， all of whom were residents of the welfare institution. The first case occurred on September 4， while the last case was reported on September 13. The incidence rate of the fifth ward area where the first case reported was 12.82% （10/78）， and it was 3.57% （3/84） in the third ward area and 1.20% （1/83） in the first ward area. There was a significant difference in incidence rates between ward areas （χ²=8.90， P<0.05）， but no significant difference was observed in age distribution and length of hospitalization. Thirty-three samples were collected for detection of nine kinds of IgM antibodies against respiratory pathogens. The results showed that the Mycoplasma pneumoniae IgM antibody was weakly positive in the 14 cases. ConclusionBased on the epidemiological history， clinical symptoms and laboratory tests， it was concluded that it was an outbreak of Mycoplasma pneumoniae infection within the welfare institution. Welfare institutions should continue to control the occurrence and outbreak of infection through effective routine hygiene， ventilation， and disinfection so as to ensure the health and safety of their clients.

Objective: To under the prevalence of malnutrition and its associated factors in school aged children with cerebral palsy, so as to provide a basis for relevant departments to formulate targeted policies. Methods: From July to August 2023, the researchers selected 333 children with cerebral palsy and 960 children with other diseases aged 6-18 years who were residents of a social welfare institution in Guangzhou, China. Their height and weight were measured and a nutritional status analysis was carried out using a cluster sampling method. Multivariate Logistic analysis was performed to analyze the relative factors and malnutrition status of school aged children with cerebral palsy. Results: The prevalence of growth retardation among school aged children with cerebral palsy was 74.5%, with rates of stunting, normal nutrition status, and overweight/obesity being 17.7%, 7.2%, and 0.6%, respectively. The results of the univariate analysis revealed statistically significant differences in the detection rate of malnutrition among school aged children with cerebral palsy based on gender, gross motor function classification system (GMFCS) grading, and the presence of swallowing disorders ( χ 2=6.02, 15.23, 32.16, P <0.05). The results of the multivariate Logistic regression analysis showed that gender ( OR=0.37, 95%CI =0.15-0.91), dysphagia (OR=4.10, 95%CI =1.39-12.12), and GMFCS classification ( OR=1.45, 95%CI =1.04-3.01) were influencing factors of malnutrition ( P <0.05). Conclusions The detection rate of malnutrition among children and adolescents with cerebral palsy in welfare institutions was found to be relatively high, and influenced by various factors. Corresponding nutritional interventions should be developed and implemented based on the risk factors of malnutrition in school aged children with cerebral palsy to improve their nutritional status.

γ-aminobutyric acid can be produced by a one-step enzymatic reaction catalyzed by glutamic acid decarboxylase. The reaction system is simple and environmentally friendly. However, the majority of GAD enzymes catalyze the reaction under acidic pH at a relatively narrow range. Thus, inorganic salts are usually needed to maintain the optimal catalytic environment, which adds additional components to the reaction system. In addition, the pH of solution will gradually rise along with the production of γ-aminobutyric acid, which is not conducive for GAD to function continuously. In this study, we cloned the glutamate decarboxylase LpGAD from a Lactobacillus plantarum capable of efficiently producing γ-aminobutyric acid, and rationally engineered the catalytic pH range of LpGAD based on surface charge. A triple point mutant LpGAD^{S24R/D88R/Y309K} was obtained from different combinations of 9 point mutations. The enzyme activity at pH 6.0 was 1.68 times of that of the wild type, suggesting the catalytic pH range of the mutant was widened, and the possible mechanism underpinning this increase was discussed through kinetic simulation. Furthermore, we overexpressed the Lpgad and Lpgad^{S24R/D88R/Y309K} genes in Corynebacterium glutamicum E01 and optimized the transformation conditions. An optimized whole cell transformation process was conducted under 40 ℃, cell mass (OD₆₀₀) 20, 100 g/L l-glutamic acid substrate and 100 μmol/L pyridoxal 5-phosphate. The γ-aminobutyric acid titer of the recombinant strain reached 402.8 g/L in a fed-batch reaction carried out in a 5 L fermenter without adjusting pH, which was 1.63 times higher than that of the control. This study expanded the catalytic pH range of and increased the enzyme activity of LpGAD. The improved production efficiency of γ-aminobutyric acid may facilitate its large-scale production.
Glutamate Decarboxylase/genetics* ; Lactobacillus plantarum/genetics* ; Catalysis ; gamma-Aminobutyric Acid ; Hydrogen-Ion Concentration ; Glutamic Acid

Background::Parkinson’s disease (PD) is the second most common neurodegenerative disease after Alzheimer’s dementia. Mitochondrial dysfunction is involved in the pathology of PD. Coiled-coil-helix-coiled-coil-helix domain-containing 2 (CHCHD2) was identified as associated with autosomal dominant PD. However, the mechanism of CHCHD2 in PD remains unclear.Methods::Short hairpin RNA (ShRNA)-mediated CHCHD2 knockdown or lentivirus-mediated CHCHD2 overexpression was performed to investigate the impact of CHCHD2 on mitochondrial morphology and function in neuronal tumor cell lines represented with human neuroblastoma (SHSY5Y) and HeLa cells. Blue-native polyacrylamide gel electrophoresis (PAGE) and two-dimensional sodium dodecyl sulfate-PAGE analysis were used to illustrate the role of CHCHD2 in mitochondrial contact site and cristae organizing system (MICOS). Co-immunoprecipitation and immunoblotting were used to address the interaction between CHCHD2 and Mic10. Serotype injection of adeno-associated vector-mediated CHCHD2 and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) administration were used to examine the influence of CHCHD2 in vivo.Results::We found that the overexpression of CHCHD2 can protect against methyl-4-phenylpyridinium (MPP+)-induced mitochondrial dysfunction and inhibit the loss of dopaminergic neurons in the MPTP-induced mouse model. Furthermore, we identified that CHCHD2 interacted with Mic10, and overexpression of CHCHD2 can protect against MPP +-induced MICOS impairment, while knockdown of CHCHD2 impaired the stability of MICOS. Conclusion::This study indicated that CHCHD2 could interact with Mic10 and maintain the stability of the MICOS complex, which contributes to protecting mitochondrial function in PD.

Objective: To explore the effect of long term aerobic exercise on microcirculation function and VO 2max of college students, and to explore the relationship between microcirculation function and VO 2max . Methods: Seventy sports major college students were selected as the exercise group, 70 sedentary non sports major students were selected as the control group. PF6000 dual channel laser Doppler blood flow detector was used to assess the skin microcirculation function on the quadriceps femoris muscle of the subjects right lower limbs.The PFT Ergo cardiopulmonary function test system and the equipped power bicycle were used to measure the VO 2max of the subjects. Results: The baseline value of MBP in the exercise group was significantly lower than that in the control group (6.5±1.8 vs. 8.1±2.5), but the microvascular reactivity(1 666.3±588.6 vs. 1 165.2±407.1) was significantly higher than that in the control group(t =-3.42，4.46， P <0.01). The absolute value of VO 2max (2 684.8±451.1 vs. 2 474.4±423.5) and relative value (42.7±4.3 vs. 35.1±4.8) in exercise group were significantly higher than those in control group( t =2.16，3.25， P < 0.01 ). Multiple regression showed that there was a positive correlation between microvascular reactivity and VO 2max (relative value) ( β = 0.40 , P =0.03), but no significant correlation between percutaneous oxygen partial pressure and VO 2max (relative value) ( β= 0.23 , P =0.19). Conclusion Long term physical exercise can decrease microcirculation perfusion volume, improve microvascular reactivity, percutaneous oxygen partial pressure among college students. Improvement of the microvascular reactivity may be a sport improving VO 2max (relative) one of the most important peripheral physiological mechanism.

Objective To explore the clinical curative effects of non-weight-bearing area osteotomy of anterior lateral tibial condyle in treating posterior-lateral condyle fracture of tibial plateau.Methods A retrospective analysis was carried out on 24 cases of posterior-lateral condyle fracture of tibial plateau treated by osteotomy of anterior lateral tibial condyle in this hospital from December 2012 to December 2015,including 15 males and 9 females,aged 26-59 years old with an average age of 42.2 years old.Fracture Schatker classification:type Ⅱ in 16 cases,type Ⅴ in 3 cases and type Ⅵ in 5 cases.All 24 cases adopted surgical treatment via the approach of anterior lateral tibial condyle.During operation,the non-bearing area of lateral tibial condyle was cut to expose and reset the posterior-lateral fractured condyle and fix it with lateral raft steel plate.At the time of last follow-up,the recovery of the knee joint function was evaluated according to the knee scoring system of Hospital for Special Surgery (HSS) in USA.Results Twenty-four patients were postoperatively followed up for 12-24 months,with an average of 13.1 months.The Rasmussen score for the postoperative immediate fracture reduction quality averaged (17.3 ± 0.8)points;there were 19 cases of excellent results and 5 cases of good results,with the excellent and good rate of 100 ％.Twenty-four cases had no incision infection,no internal fixation loosening or breakage.The X ray film showed that the fracture got healing,and the average healing time was (13.1 ± 1.1) weeks(12-15 weeks).No surgery related complications including blood vessel and nerve damage occurred;2 cases appeared small area of superficial necrosis at the edge of the posterior incision,which was healed after dressing.At the last follow-up,the HSS knee score was(93.0±6.4) points,excellent in 19 cases,good in 4 cases,and fair in 1 case,with the excellent and good rate of 95.8％.Conclusion For the patients with posterior-lateral condyle fracture of tibial platform,non-weight-bearing area osteotomy approach of lateral tibial condyle allows enough space to directly expose the fracture area and carry out operation;combined with lateral raft locking steel plate fixation is more reliableto fixthe fractured bone,with convenient operation positioning,good postoperative functional recovery,fewer complications,and satisfied curative effects.

Objective To investigate the prevalence of iron deficiency(ID)and iron deficiency anemia (IDA) in pregnant women in urban areas of China. Methods The study was a national cross-sectional survey conducted from September 19th, 2016 to November 20th, 2016. According to the classification of the National Bureau of Statistics, all survey sites were set up in 6 regions of the country. Pregnant women were continuously selected using multistage stratified sampling. A total of 12 403 pregnant women were collected and examined for serum ferritin and hemoglobin levels. Results The median serum ferritin level during pregnancy was 20.60 μg/L(11.78-36.98 μg/L), the hemoglobin level was(118±12)g/L. With the progress of pregnancy, the levels of serum ferritin and hemoglobin decreased gradually. The median serum ferritin levels in the first, second trimester and third trimester were 54.30 μg/L(34.48-94.01 μg/L), 28.60 μg/L(16.40-50.52 μg/L), and 16.70 μg/L(10.20-27.00 μg/L)respectively(P<0.01). The mean hemoglobin levels were(127 ± 10)g/L,(119 ± 11)g/L and(117 ± 11)g/L respectively(P<0.01). The prevalence of ID in urban pregnant women was 48.16%(5 973/12 403), and IDA prevalence was 13.87% (1 720/12 403). The prevalence of IDA in the first, second trimester and third trimester were 1.96% (20/1 019), 8.40%(293/3 487)and 17.82%(1 407/7 897), respectively(P<0.01). The prevalence of standardized ID and IDA were significantly different in various regions of China(P<0.01). The standardized prevalence of ID were relatively higher in East China and Northeast China, 57.37% and 53.41% respectively, while it was the lowest in Southwest China, 30.51%. The standardized prevalence of IDA in South Central, Northwest, and East China were relatively high, 21.30%, 16.97% and 17.53% respectively, and the standardized prevalence of IDA in Southwest China was the lowest, 5.44%,the differents in various regions were significant(all P<0.01). Conclusion The current phenomenon of ID and IDA in pregnant women is still very common,and nutrition and health care during pregnancy should be strengthened.

Objective To evaluate the clinical efficacy and safety of nanoparticle albumin-bound paclitaxel (Nab-P) in the treatment of advanced non-small cell lung cancer (NSCLC). Methods Fifty-six over 65 years old patients with advanced NSCLC treated with Nab-P monotherapy in department of chemotherapy of the People's Hospital of Zhongshan City from January 2014 to January 2017 were analyzed retrospectively. The chemotherapy regimen was Nab-P 260 mg/m2, on d1 or d1 + d8, every 21 day for a cycle, imaging examination was made for efficacy evaluation after every 2 cycles. Results All 56 patients had been evaluated for efficacy, and received a total of 186 cycles of chemotherapy. All patients had been completed 2 cycles or more than 2 cycles of chemotherapy, and the median number of chemotherapy cycles was 3. The treatment response rate (RR) was 25.0 ％ and the disease control rate (DCR) was 76.8 ％. The median progression free survival (PFS) time was 4.7 months. The main adverse reactions were neutropenia, nausea and vomiting, fatigue and peripheral nerve toxicity. However, the vast majorities of adverse reactions were grade 1-2, and can be improved after treatment. Conclusions Nab-P is effective in the treatment of advanced NSCLC in elderly patients. The adverse reactions are mild and tolerant, and it is worthy to be popularized.

This study was aimed to investigate the antitussive,expectorant,antiasthmatic and anti-inflammatory effect of Ju-Hong Tan-Ke (JHTK) liquid.The methods of cough induced by ammonia in mice and cough induced by citric acid in guinea pigs were used to observe the antitussive effects.The mouse phenolsulfonphthalein excretion method,rat capillary expectoration method and the rabbit tracheal cilia movement influence experiment were used to observe the expectorant effect.An experiment of allergen induced rats' asthma was used to observe the antiasthmatic effects.The anti-inflammatory effect was observed by mouse peritoneal capillary permeability test and xylene induced ear swelling in mice.The results showed that JHTK liquid could inhibit cough induced by ammonia in mice,decrease the frequency of cough induced by citric acid in guinea pig and prolong the latent period of cough.The medicine could also obviously increase phenol red output of trachea in mice,promote expectoration in rats,accelerate the movement of cilium of tracheal transparently and prolong the latent period of asthma induced by allergens in rats,inhibit capillary permeability and lighten ear edema in mouse model.It was concluded that JHTK liquid could inhibit the reflex cough caused by hypersensitivity of airway sensor.It is peripheral antitussive rather than central antitussive,which has significant antitussive,expectorant,antiasthmatic and anti-inflammatory effects.Its efficacy is superior or equivalent to positive chemical control medicine.

Objective To study the effect of litchi saponin and flavones on glycometabolism in insulin resistance model of HepG2 cells .Methods Using high insulin in HepG2 cells to establish a cell model of insulin resistance .Cell model was treated by litchi saponin ,litchi flavones and rosiglitazone ,respectively .Glucose concentration of cell culture supernatant was detected by glucose oxidase method .Results In the concentration of 10-6 mol/L insulin for 24 hours ,HepG2 reached the highest level of resistant to insulin ,which means a successful insulin resistance cell model was established .However ,no significant decrease in glucose concentration of cell culture supernatant was observed with litchi saponin and flavones .Conclusion This study sug-gests that litchi saponin and flavones have no effect to improve insulin resistance .