Qualitative and Quantitative Analysis of Chemical Constituents in Liu Junzitang by UPLC-Q-TOF-MS/MS and UPLC / 中国实验方剂学杂志

ObjectiveTo establish a qualitative and quantitative analysis method for chemical constituents in Liu Junzitang（LJZT）， and to clarify its material basis. MethodThe chemical constituents in LJZT were analyzed by ultra performance liquid chromatography-quadrupole-time-of-flight mass spectrometry（UPLC-Q-TOF-MS/MS）， and the resulting compounds were identified by using databases， such as MassBank， PubChem， ChemSpider， Traditional Chinese Medicine Systems Pharmacology Database and Analytical Platform（TCMSP）， and by combining with relevant literature. UPLC was used to establish a quantitative method for analysis of 9 compounds in LJZT， including liquiritin， hesperidin， lobetyolin， liquiritigenin， glycyrrhizic acid， nobiletin， tangeretin， atractylenolide Ⅱ and Ⅰ. ResultBy combining the relevant literature， database and MS information， a total of 79 compounds were identified from LJZT， including 31 flavonoids， 15 terpenoids， 14 nitrogen-containing compounds， 6 phenylpropanoids， 6 organic acids and 7 other compounds. The established quantitative analytical method for the nine representative components showed good linearity within their respective linear ranges， and the precision， stability， reproducibility and recovery were in accordance with the requirements. The quantitative results showed that the contents of liquiritin， hesperidin， lobetyolin， liquiritigenin， glycyrrhizic acid， nobiletin， tangeretin， atractylenolide Ⅱ and Ⅰ in LJZT were 0.376 5， 2.602 1， 0.082 6， 0.128 1， 1.778 6， 0.015 7， 0.006 7， 0.030 4， 0.003 2 mg·g-1， respectively. ConclusionThe established method can quickly， sensitively and accurately analyze the chemical constituents in LJZT， clarify that the material basis of LJZT is mainly flavonoids， terpenoids and nitrogen-containing compounds， and simultaneously determine the contents of the 9 components， which can lay a foundation for the research on quality control， mechanism and clinical application of LJZT.

Delivery of spike-RBD by bacterial type three secretion system for SARS-CoV-2 vaccine development.

COVID-19 pandemic continues to spread throughout the world with an urgent demand for a safe and protective vaccine to effectuate herd protection and control the spread of SARS-CoV-2. Here, we report the development of a bacterial vector COVID-19 vaccine (aPA-RBD) that carries the gene for the receptor-binding domain (RBD) of the SARS-CoV-2 spike protein. Live-attenuated strains of Pseudomonas aeruginosa (aPA) were constructed which express the recombinant RBD and effectively deliver RBD protein into various antigen presenting cells through bacterial type 3 secretion system (T3SS) in vitro. In mice, two-dose of intranasal aPA-RBD vaccinations elicited the development of RBD-specific serum IgG and IgM. Importantly, the sera from the immunized mice were able to neutralize host cell infections by SARS-CoV-2 pseudovirus as well as the authentic virus variants potently. T-cell responses of immunized mice were assessed by enzyme-linked immunospot (ELISPOT) and intracellular cytokine staining (ICS) assays. aPA-RBD vaccinations can elicit RBD-specific CD4+and CD8+T cell responses. T3SS-based RBD intracellular delivery heightens the efficiency of antigen presentation and enables the aPA-RBD vaccine to elicit CD8+T cell response. Thus, aPA vector has the potential as an inexpensive, readily manufactured, and respiratory tract vaccination route vaccine platform for other pathogens.

Regulatory and structural mechanisms of PvrA-mediated regulation of the PQS quorum-sensing system and PHA biosynthesis in Pseudomonas aeruginosa.

Pseudomonas aeruginosa is capable of causing acute and chronic infections in various host tissues, which depends on its abilities to effectively utilize host-derived nutrients and produce protein virulence factors and toxic compounds. However, the regulatory mechanisms that direct metabolic intermediates towards production of toxic compounds are poorly understood. We previously identified a regulatory protein PvrA that controls genes involved in fatty acid catabolism by binding to palmitoyl-coenzyme A (CoA). In this study, transcriptomic analyses revealed that PvrA activates the Pseudomonas quinolone signal (PQS) synthesis genes, while suppressing genes for production of polyhydroxyalkanoates (PHAs). When palmitic acid was the sole carbon source, mutation of pvrA reduced production of pyocyanin and rhamnolipids due to defective PQS synthesis, but increased PHA production. We further solved the co-crystal structure of PvrA with palmitoyl-CoA and identified palmitoyl-CoA-binding residues. By using pvrA mutants, we verified the roles of the key palmitoyl-CoA-binding residues in gene regulation in response to palmitic acid. Since the PQS signal molecules, rhamnolipids and PHA synthesis pathways are interconnected by common metabolic intermediates, our results revealed a regulatory mechanism that directs carbon flux from carbon/energy storage to virulence factor production, which might be crucial for the pathogenesis.

Research Progress of Indocyanine Green Fluorescence Laparoscopic Technique in Clinical Application / 中国医疗器械杂志

Indocyanine green (ICG) is the most commonly used near-infrared fluorescent (NIRF) dye in clinical practice, and its mediated near-infrared fluorescence imaging technology is gradually applied in clinical practice. It has shown great potential in invasive surgery (MIS) and is expected to become the standard technology for surgical diagnosis and treatment of diseases. The clinical application of ICG fluorescence laparoscopy is reviewed here.

High-Level Expression of Cell-Surface Signaling System Hxu Enhances Pseudomonas aeruginosa Bloodstream Infection.

Bloodstream infections (BSIs) caused by Pseudomonas aeruginosa are associated with a high mortality rate in the clinic. However, the fitness mechanisms responsible for the evolution of virulence factors that facilitate the dissemination of P. aeruginosa to the bloodstream are poorly understood. In this study, a transcriptomic analysis of the BSI-associated P. aeruginosa clinical isolates showed a high-level expression of cell-surface signaling (CSS) system Hxu. Whole-genome sequencing and comparative genomics of these isolates showed that a mutation in rnfE gene was responsible for the elevated expression of the Hxu-CSS pathway. Most importantly, deletion of the hxuIRA gene cluster in a laboratory strain PAO1 reduced its BSI capability while overexpression of the HxuIRA pathway promoted BSI in a murine sepsis model. We further demonstrated that multiple components in the blood plasma, including heme, hemoglobin, the heme-scavenging proteins haptoglobin, and hemopexin, as well as the iron-delivery protein transferrin, could activate the Hxu system. Together, these studies suggested that the Hxu-CSS system was an important signal transduction pathway contributing to the adaptive pathogenesis of P. aeruginosa in BSI.

ECF Sigma Factor HxuI Is Critical for In Vivo Fitness of Pseudomonas aeruginosa during Infection.

The opportunistic pathogen Pseudomonas aeruginosa often adapts to its host environment and causes recurrent nosocomial infections. The extracytoplasmic function (ECF) sigma factor enables bacteria to alter their gene expression in response to host environmental stimuli. Here, we report an ECF sigma factor, HxuI, which is rapidly induced once P. aeruginosa encounters the host. Host stresses such as iron limitation, oxidative stress, low oxygen, and nitric oxide induce the expression of hxuI. By combining RNA-seq and promoter-lacZ reporter fusion analysis, we reveal that HxuI can activate the expression of diverse metabolic and virulence pathways which are critical to P. aeruginosa infections, including iron acquisition, denitrification, pyocyanin synthesis, and bacteriocin production. Most importantly, overexpression of the hxuI in the laboratory strain PAO1 promotes its colonization in both murine lung and subcutaneous infections. Together, our findings show that HxuI, a key player in host stress-response, controls the in vivo adaptability and virulence of P. aeruginosa during infection. IMPORTANCE P. aeruginosa has a strong ability to adapt to diverse environments, making it capable of causing recurrent and multisite infections in clinics. Understanding host adaptive mechanisms plays an important guiding role in the development of new anti-infective agents. Here, we demonstrate that an ECFσ factor of P. aeruginosa response to the host-inflicted stresses, which promotes the bacterial in vivo fitness and pathogenicity. Furthermore, our findings may help explain the emergence of highly transmissible strains of P. aeruginosa and the acute exacerbations during chronic infections.

Acetylation of the CspA family protein CspC controls the type III secretion system through translational regulation of exsA in Pseudomonas aeruginosa.

The ability to fine tune global gene expression in response to host environment is critical for the virulence of pathogenic bacteria. The host temperature is exploited by the bacteria as a cue for triggering virulence gene expression. However, little is known about the mechanism employed by Pseudomonas aeruginosa to response to host body temperature. CspA family proteins are RNA chaperones that modulate gene expression. Here we explored the functions of P. aeruginosa CspA family proteins and found that CspC (PA0456) controls the bacterial virulence. Combining transcriptomic analyses, RNA-immunoprecipitation and high-throughput sequencing (RIP-Seq), we demonstrated that CspC represses the type III secretion system (T3SS) by binding to the 5' untranslated region of the mRNA of exsA, which encodes the T3SS master regulatory protein. We further demonstrated that acetylation at K41 of the CspC reduces its affinity to nucleic acids. Shifting the culture temperature from 25°C to 37°C or infection of mouse lung increased the CspC acetylation, which derepressed the expression of the T3SS genes, resulting in elevated virulence. Overall, our results identified the regulatory targets of CspC and revealed a regulatory mechanism of the T3SS in response to temperature shift and host in vivo environment.

Evolution of Resistance to Phenazine Antibiotics in Staphylococcus aureus and Its Role During Coinfection with Pseudomonas aeruginosa.

In the niches that Staphylococcus aureus and Pseudomonas aeruginosa coinhabit, the later pathogen produces phenazine antibiotics to inhibit the growth of S. aureus. Recently, a group of halogenated phenazines (HPs) has been shown to have potent antimicrobial activities against Staphylococci; however, no HP-resistant mutant has been reported. Here, we demonstrate that S. aureus develops HP-resistance via single amino acid change (Arg116Cys) in a transcriptional repressor TetR21. RNA-seq analysis showed that the TetR21R116C variation caused drastic up-regulation of an adjacent gene hprS (halogenated phenazine resistance protein of S. aureus). Deletion of the hprS in the TetR21R116C background restored bacterial susceptibility to HP, while hprS overexpression in S. aureus conferred HP-resistance. The expression of HprS is under tight transcriptional control of the TetR21 via direct binding to the promoter region of hprS. The R116C mutation in TetR21 significantly reduced its DNA binding affinity. Moreover, natural phenazine antibiotics (phenazine-1-carboxylic acid and pyocyanin) and a HP analog (HP-22) are ligands for the TetR21, regulating its repressor activity. Combining homology analysis and LC-MS/MS assay we demonstrated that HprS is a phenazine efflux pump. To the best of our knowledge, we provide the first report of phenazine efflux pump in S. aureus. Interestingly, the TetR21R116C variation has been found in some clinical S. aureus isolates, and a laboratory strain of S. aureus with TetR21R116C variation showed enhanced growth competitiveness toward P. aeruginosa and promoted coinfection with P. aeruginosa in the host environment, demonstrating significance of the mutation in host infections.

Application effect of magnetic service concept in clinical nursing for patients with acute gastroenteritis / 中国实用护理杂志

Objective:To explore the application effect of magnetic service concept in clinical nursing for patients with acute gastroenteritis.Methods:A total of 101 patients with acute gastroenteritis undergoing magnetic service concept intervention in gastroenterology department of Lishui Central Hospital were selected as study group from January 2019 to January 2020, other 97 patients with acute gastroenteritis undergoing routine nursing intervention were enrolled as control group from January to December 2018. The scores of Hamilton Anxiety Scale (HAMA), Hamilton Depression Scale (HAMD), self-care ability and quality of life before and after intervention were observed and compared between the two groups. The scores of nursing satisfaction were recorded and compared between the two groups.Results:After nursing, HAMA and HAMD scores in study group were (13.39 ± 4.56) and (17.89 ± 6.63) points, which were significantly lower than those in control group (18.60 ± 6.79) and (21.51 ± 6.03) ( t values were 6.36 and 4.11, P<0.05). After nursing, scores of self-concept, self-responsibility, self-care skills and health awareness in study group were (79.12 ± 4.98), (79.85 ± 5.47), (80.22 ± 3.89) and (76.25 ± 5.98) points, which were higher than those in control group (52.08 ± 3.63), (58.88 ± 7.25), (57.65 ± 3.62), (54.12 ± 5.06) points (t values were 23.06-43.41, P<0.05). After nursing, scores of physiology, mentality, emotion and social contact in study group were (69.14 ± 4.21), (82.13 ± 6.12), (71.25 ± 5.28) and (82.95 ± 7.22) points, which were higher than those in control group (60.41 ± 3.26), (69.57 ± 4.26), (57.13 ± 3.21), (68.07 ± 5.14) points (t values were 16.27-33.63, P<0.05). The scores of satisfaction with life care, regular wards inspections, bell calling, service attitudes and health education in study group were (90.40 ± 6.80), (91.38 ± 6.82), (90.22 ± 4.96), (90.88 ± 5.56) and (92.46 ± 6.38) points, which were higher than those in control group (81.22 ± 5.83), (80.44 ± 4.25), (82.12 ± 4.65), (83.24 ± 4.56), (82.06 ± 3.55) points (t values were 10.18-14.09, P<0.05). Conclusions:The magnetic service concept can improve psychological status and quality of life in patients with acute gastroenteritis, enhance self-care ability and nursing satisfaction.

Wastewater Analysis of SARS-CoV-2 as a Predictive Metric of Positivity Rate for a Major Metropolis

Wastewater monitoring for SARS-CoV-2 has been suggested as an epidemiological indicator of community infection dynamics and disease prevalence. We report wastewater viral RNA levels of SARS-CoV-2 in a major metropolis serving over 3.6 million people geographically spread over 39 distinct sampling sites. Viral RNA levels were followed weekly for 22 weeks, both before, during, and after a major surge in cases, and simultaneously by two independent laboratories. We found SARS-CoV-2 RNA wastewater levels were a strong predictive indicator of trends in the nasal positivity rate two-weeks in advance. Furthermore, wastewater viral RNA loads demonstrated robust tracking of positivity rate for populations served by individual treatment plants, findings which were used in real-time to make public health interventions, including deployment of testing and education strike teams.

Exploring potential affected site for the inhibition of Aβ42 polymerization based on Asn27 deamidation modification / 药学学报

One of pathological features of Alzheimer's disease (AD) is extracelluar aggregation of amyloid-β protein (Aβ) forming senile plaques. Investigation on inhibition of Aβ aggregation can be crucial for designing effective drugs against AD. Previous studies have demonstrated that the deamidation at Asn27, a type of post translation modification, significantly prevented the polymerization of Aβ monomers. But the underlying mechanism is still unclear. Therefore, we investigated the possible effect of Asn27 deamidation on structure and aggregation of Aβ42 monomer using molecular dynamics simulation. The results showed that the deamidation of Asn27 can directly disrupt the salt bridge formed between D23 and K28, and effectively decrease the content of β-sheet that is important for aggregation of Aβ. Moreover, the inability at C-terminal region (CTR) and N-terminal region (NTR) to form antiparallel β-sheets further weakens the intra-peptide interaction of Aβ42 monomer. These changes caused by Asn27 deamidation lead to the decline of the aggregated trend of Aβ42 monomer, which is consistent with the experimental observation. According to these results, the salt bridge formed between D23 and K28 plays an important role in promoting the polymerization process between Aβ42 monomers, and disrupting this interaction may be a potential direction for further designing drugs to inhibit aggregation of Aβ42. In summary, this study shows a potential affected site that can efficiently inhibit aggregation of Aβ42.

Regulatory Effect of Guben Fangxiao Decoction on Expression of TLR4 and TLR7 in Mice with Asthma Remission / 中国实验方剂学杂志

Objective:To observe the regulatory effect of Guben Fangxiao decoction on Toll-like receptor (TLR)4, TLR7, nuclear factor-kappa B p65 (NF-κB p65) and NF-κB inhibitor protein alpha (IκBα) in mice with asthma remission, in order to explore the mechanism of Guben Fangxiao decoction in treating asthma remission. Method:Respiratory syncytial virus (RSV) combined with chicken ovalbumin (OVA) was used to build asthma remission model in 3-week-old BALB/c mice. Sixty mice were divided into blank group, model group, dexamethasone group (0.001 g·kg-1), low,medium and high-dose Guben Fangxiao decoction group (6.5,13,26 g·kg-1), respectively. Intervention was given once a day for 28 days. After administration, the mice were put to death. Hematoxylin-eosin (HE) staining was used to observe the pathological changes of lung tissue and score the pulmonary inflammation. Western blot was used to detect the expressions of TLR4, TLR7, IκBα and nuclear NF-κB p65 in lung tissue of mice. Immunofluorescence was used to observe the expression of NF-κB p65 in cellnucleuses. Result:Compared with blank group, the lung tissue of model group showed obvious inflammatory cell infiltration (PκB p65 increased significantly (PκBα proteins increased significantly (PPκB p65 (PκB p65 (PκBα proteins (PConclusion:Guben Fangxiao decoction can alleviate airway inflammation, and its therapeutic effect may be achieved by regulating TLR4, TLR7, NF-κB p65 and IκBα.

Improvement research on amniotic fluid cell in situ culture and karyotype preparation methods / 医学研究生学报

Objective　Amniotic fluid chromosome karyotype analysis is the golden standard for prenatal diagnosis of chromosome diseases, but its success rate is low due to many factors affecting amniotic fluid culture. The research aimed to investigate the relevant factors influencing the success rate of amniotic fluid cell in situ culture and explore the condition of karyotype preparation in order to establish a stable method to prepare amniotic fluid cell chromosome with high success rate.　Methods　Cell culture was done in amniotic fluid obtained from 435 pregnant women with prenatal diagnosis indications by amniocentesis. Statistical analysis was done on the relationship between the amount of amniotic fluid after centrifugal precipitation, the material of operation apparatus and the culture result, as well as the relationship between ambient temperature and humidity and karyotype dispersion degree.　Results　Successful culture was obtain in 406 cases out of 435 cases, with the success rate being 93.3%. According to the culture result, compared with white cell mass group, the culture success rates were significantly reduced in mass brown cell group and mass fresh red cell group (P<0.01). Compared with mass fresh red cell group, the culture success rate was significantly reduced in small fresh red cell group (P<0.01). Compared with the plastic group, the culture success rate was significantly increased in glass group (P<0.01). Compared with the plastic injector and other glass group, the culture success rate was significantly improved in glass group (P<0.05). The score of the karyotype dispersion degree showed slides made at 28℃of room temperature and 50% humidity were significantly better than those made at room temperature and humidity, 28℃ of room temperature and room humidity, room temperature and 50% humidity (P<0.01). Slides made at room temperature and 50% humidity were significantly better than those at room temperature and humidity, and 28℃ of room temperature and room humidity (P<0.01).　Conclusion　The methods including improving the technological level of amniocentesis, handling bloody amniotic fluid timely and correctly, and the application of glass injectors and other apparatus, can effectively improve the success rate of amniotic fluid cell culture. Controlling the environmental temperature and humidity (28℃,50%) in dispersion course contributes to qualified slides for karyotype analysis, providing safeguard for prenatal diagnosis.

Analysis of audiological characteristics and genetic background in patients with nonsyndromic deafness and mitochondrial DNA 1555A>G mutation / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To analyze the audiological features and genetic background of patients carrying mitochondrial DNA(mtDNA) 1555A>G mutation and factors which may influence the extent of nonsyndromic hearing loss associated with the mutation.</p><p><b>METHODS</b>A literature search was carried out on databases including PubMed, CNKI, Wanfang, and VIP. Combined with author's data, the clinical features of the patients, in particular audiological characteristics, were summarized.</p><p><b>RESULTS</b>A total of 857 effective cases were collected and analyzed. A significantly correlation was identified between history of aminoglycosides exposure and extent of hearing loss, in addition with a negative correlation between the age of onset and extent of hearing-impairment. Drug exposure was corelated with the age of onset but independent to the loss of high-frequency hearing loss. Heteroplasmies had a reverse correlation with the degree of hearing loss. Among the haplotypes of mitochondrial DNA, haplotype D was the most common one, while haplotype B had the highest penetrance.</p><p><b>CONCLUSION</b>Nonsyndromic hearing loss associated with mitochondrial DNA 1555A>G mutation is influenced by factors such as aminoglycosides exposure, age, proportion of mutation, and haplotype of the mitochondrial DNA. Analysis of clinical cases is critical for identifying individuals carrying deafness susceptibility mutations and is the first step for early diagnosis.</p>

A Torso Simulator Design for Implantable Nerve Stimulator Test / 中国医疗器械杂志

This paper introduces ISO 14708-3:2017, the new edition of the international standard for implantable neurostimulator, and emphasizes the new requirements in the clause of protection from RF electromagnetic interference. To meet this new requirements, this paper presents a design of torso simulator for the testing of implantable neurostimulator. The design includes volume conductor, electrodes and grids, which can simulate the actual operating environment of implantable neurostimulator in RF electromagnetic interference testing. The torso simulator is verified by performance in the last part of the paper.

Aroma compounds and characteristics of noble-rot wines of Chardonnay grapes artificially botrytized in the vineyard.

Aroma characteristics and their impact volatile components of noble-rot wines elaborated from artificial botrytized Chardonnay grapes, obtained by spraying Botrytis cinerea suspension in Yuquan vineyard, Ningxia, China, were explored in this work. Dry white wine made from normal-harvested grapes and sweet wine produced from delay-harvested grapes were compared. Wine aromas were analysed by trained sensory panelists, and aroma compounds were determined by SPME-GC-MS. Results indicated that esters, fatty acids, thiols, lactones, volatile phenols and 2-nonanone increased markedly in noble-rot wines. In addition to typical aromas of noble-rot wines, artificial noble-rot wines were found to contain significant cream and dry apricot attributes. Partial Least-Squares Regression models of aroma characteristics against aroma components revealed that non-fermentative odorants were the primary contributor to dry apricot attribute, especially, thiols, C13-norisoprenoids, lactones, terpenols and phenolic acid derivatives, while cream attribute was dependent on both fermentative and non-fermentative volatile components.

The toxic effect of a mixture of melamine and cyanuric acid on the gastrointestinal tract and liver in mice.

The aim of this study was to investigate the effects of a mixture of melamine (MA) and cyanuric acid (CA) on the gastrointestinal tract and liver in mice. Kunming mice were given 0, 10, 100, or 200mg/kg.bw/day MA and CA mixture (MC, each compound) in corn oil by gavage for 7 consecutive days. Autopsy showed severe renal injury in all MC-treated mice and histopathological examination revealed dose-related lesions in the gastrointestinal tract and liver other than the kidneys. Subsequently, Kunming mice were given 0, 0.3, 1.5, or 7.5mg/kg · bw/day MC (each compound) in corn oil by gavage for 28 consecutive days. The results showed that higher doses of MC caused mortality and alteration on the body weights, relative liver weights, and blood chemistry parameters related to treatment. Histopathologically, the liver revealed scattered hepatic necrosis and apoptosis. Villous height and villus-to-crypt depth ratios were decreased in the duodenum and jejunum, with marked expression of proliferating cell nuclear antigen in the epithelium compared with controls. In conclusion, MC mixture could cause toxic effects in the gastrointestinal tract and liver in mice during acute and sub-acute toxicity study.

Early intervention impact on neurodevelopmental outcome of very preterm infants and VLBW infants at 1 year corrected age / 国际儿科学杂志

Objective To evaluate neurodevelopmental outcome of very preterm(gestational age ＜ 32 weeks) and very low birth weight infant (VLBWI) (weight ＜ 1 500 g) and to examine the effectiveness of an early intervention program till 12 months corrected age.Methods Seventy followed-up very preterms and VLB-WI in Jinan Maternity and Childcare Hospital were enrolled in this study from January 2012 to and were divided into two groups by birth weight.All infants received 20 items of behavioral neurological assessment at 1 to 12 months corrected age and tested mental and psychomotor development with the use of CDCC at 6,12 months corrected age.The preterms who were abnomal in the 20 items of behavioral neurological assessment would receive early intervention (including kinesitherapy, physiotherapy, cereal circulation therapeutic equipment) by physiotherapists and their parents who received an intervention program training and were strongly encouraged to participate in the intervention sessions.The intervention method was adjusted according to the neurological assessment.The SPSS statistical software package for Windows, version 15.0, was used to run Fisher's exact test and t-test on the data presented,and P value of less than 0.05 was regarded as statistically significant.Results The average gestational age of infants was (30.4 ± 1.8) weeks,and average birth weight (1 463.7 ± 307.5) g.The incidence of extrauterine growth restriction was 57.1％ at first follow-up.The incidence of neurodevelpmental impairment NDI) and cerebral palsy tendency at 6 corrected months were 14.3％ ,8.6％ respectively.At 12 months corrected age,the incidence of NDI decreased to 2.9％ and cerebral palsy to 2.9％.There was significant difference in the incidence of NDI between 6 and 12 corrected months.There was no significant difference in the incidence of psychomotor developmental index ＜ 70, mental developmental index ＜ 70, NDI and cerebral palsy between the two groups.Conclusion The early intervention program can improve VLBWI neurodevelopmental outcomes at 12 months' corrected age and reduce the incidence of cerebral palsy.

Advices on Improving the Classification Method of Medical Devices / 中国医疗器械杂志

This article introduces the classifications of medical devices by FDA and EU and compares them with the situation in China. Towards the problems found, several reasonable advices are put forward.

Effects of bisphenol A on the development of central immune organs of specific-pathogen-free chick embryos.

Bisphenol A (BPA) is a chemical estrogen widely used in the food packaging industry, especially in baby bottles. Its toxicity for the fetus has become a great concern in recent years. In the present study, the effects of BPA on the development of central immune organs in chick embryos were investigated. A total of 30 specific-pathogen-free (SPF) chick embryos were divided into BPA, control, and vehicle group. Chick embryos were exposed to BPA (250 µg per egg), saline (control), or corn oil (vehicle) on embryonic day 9 (ED9) by injection into the allantoic cavity. Thymuses and bursae of Fabricius were collected on ED22. The microscopic examination of tissue structure and ultrastructure was carried out for histopathological changes of thymus and the bursa of Fabricius morphology under light and scanning electron microscopes (SEM). In the BPA group, the weight index of the bursae of Fabricius was significantly reduced (p < 0.01); the number of lymphatic follicles in the bursae of Fabricius was remarkably decreased (p < 0.01); and the thickness of the thymus cortex and medulla was reduced (p < 0.01). Light microscope and SEM examinations further showed that the lymphatic follicles and epithelial cells of the bursa of Fabricius and thymus were damaged by BPA. Our study confirms a direct toxicity of BPA at a very low-dose level on the development of the central immune organs of SPF chick embryos. However, more studies are necessary to elucidate the underlying mechanisms.