[Progress in research of self-sampling for detection of genital chlamydia trachomatis and related factors in men who have sex with men]

Laboratory testing is a vital chain in the prevention and control of genital chlamydia trachomatis infection. The prevalence of genital chlamydia trachomatis infection is high, but the detection rate of the infection is low in men who have sex with men (MSM) in China. Self-sampling for genital chlamydia trachomatis detection by MSM is a new option to address this problem, which would play a significant role in expanding genital chlamydia trachomatis infection screening in this population. This paper summarizes the progress in research of self-sampling for the detection of genital chlamydia trachomatis and the related factors in MSM both at home and abroad to provide reference for the promotion of self-sampling for the detection of genital chlamydia trachomatis in this population.

Genome Sequence Resource of Fusarium proliferatum f. sp. malus domestica MR5, the Causative Agent of Apple Replant Disease

Apple replant disease (ARD) caused by the fungal pathogen Fusarium proliferatum f. sp. malus domestica (Fpmd) MR5 brings annual losses to apple production within China. However, the genomic information of the pathogen is not yet available. Here, we obtained the whole-genome sequence of the highly virulent Fpmd MR5 using the Illumina PE150 platform. The genome size was 42.76 Mb and consisted of 9,047 genes. The GC content was 48.80%, and several genes potentially associated with pathogenicity were identified, such as carbohydrate-active enzymes, secreted proteins, and secondary metabolite gene clusters. There were 260 specific virulence factor genes, mainly related to fungal vegetative growth and the production of cell wall-degrading enzymes. These data will aid future studies investigating host-pathogen interactions and help us develop suitable disease management strategies.

[Accuracy of pooling specimens from different individuals in the detection of genital Chlamydia trachomatis infection: a Meta analysis]

Objective: To determine the accuracy of pooled specimens from multiple individuals for detection of infection with Chlamydia trachomatis. Methods: By April 2022, PubMed and Embase searched relevant studies published in peer-reviewed journals. The QUADAS-2 scale of a quality assessment tool was used to assess the quality of the studies. A curve of summary receiver operating characteristic was applied as a comprehensive assessment of diagnosed accuracy. A bivariate mixed-effects model was used for overall value merging in sensitivity and specificity. In addition, the subgroup analyses regarding sample type, testing method, and the number of samples per pool were performed. Results: A total of 14 846 subjects were included in the analysis. Three studies were from the United States, three from Canada, three from Denmark, two from Lithuania, two from India, two from the Netherlands, and one from Australia, Russia, and Singapore. Compared with the individual specimens, the pooled specimens of multiple individuals had an overall sensitivity of 0.98 (95%CI: 0.97-0.99) and specificity of 1.00 (95%CI: 1.00-1.00) for the detection of Chlamydia trachomatis. Results from the subgroup showed that the overall sensitivity of ligase chain reaction was significantly higher than that of PCR in the diagnosis of pooled samples. Conclusion: It is concluded from the published studies that the pooled specimens were substantially consistent with the single specimens in detecting infection with Chlamydia trachomatis.

Discovery of Fusarium proliferatum f. sp. malus domestica Causing Apple Replant Disease in China

Apple replant disease (ARD) is the most serious threat facing the apple industry globally. ARD is mainly manifested as decreased plant growth, serious root rot disease, and considerable yield loss. Microbial factors are the dominant factors leading to the occurrence of ARD. Research on soil-borne pathogenic fungi leading to the occurrence of ARD in China is limited. In the present study, we selected 16 replanting orchards from the Northwest Loess region and around the Bohai Gulf. Diseased roots and rhizosphere soil from healthy apple trees and trees showing ARD symptoms were sampled at random. High-throughput sequencing was used to study the fungal communities in the rhizosphere soil, which showed that the composition of the rhizosphere soil fungal community of ARD-symptomatic and healthy apple trees was different. Nectriaceae at the family level and Fusarium at the genus level dominated the rhizosphere soil fungal community in the two regions, while for healthy apple trees, the relative abundance of Mortierella, Minimedusa, Tetracladium, and Chaetomium was higher. Tissue separation and serial dilution were used to separate fungi, and a total of 89 genera and 219 species were obtained, most of which were Fusarium. Fusarium was further confirmed to be the most abundant pathogen species leading to the occurrence of ARD in China through pathogenicity assays. A pathogenicity assay was carried out by the dip-and-cut technique using different host plants. It was found that Fusarium MR5 showed strong aggressiveness to apple rootstocks. Diseased seedlings specifically exhibited chlorosis of the leaves, browning from the edge of the leaf, followed by rolling and yellowing of the leaves, resulting in wilting and eventually death. Strain MR5 was preliminarily identified as F. proliferatum according to the morphological and cultural characteristics. A maximum likelihood analysis of identities based on six gene sequence (ITS, TUB2, IGS, mtSSU, RPB2, and the TEF gene) alignments between the MR5 strain and other strains showed 99 to 100% homology with F. proliferatum. Based on our test results, strain MR5 was identified as F. proliferatum f. sp. malus domestica, which is of great significance for finding new measures to control ARD in China.

[Long-term outcomes and failure patterns of definitive radiotherapy for cervical esophageal carcinoma]

Objective: To evaluate the long-term outcomes, failure patterns and prognostic factors of definitive radiotherapy in patients with cervical esophageal carcinoma (CEC). Methods: We retrospectively reviewed the clinical data of 148 CEC patients who treated with definitive radiotherapy in Cancer Hospital of Chinese Academy of Medical Sciences from January 2001 to December 2017. The median radiation dose was 66 Gy (59.4-70 Gy) and 33.1% of patients received concurrent chemotherapy. The Kaplan-Meier method was used to calculate survival rates. The log rank test was used for survival comparison and univariate prognostic analysis. The Cox model was used for multivariate prognostic analysis. Results: The median follow-up time was 102.6 months. The median survival time, 2- and 5-year overall survival (OS) were 22.7 months, 49.9% and 28.3%. The median, 2- and 5-year progression-free survival were 12.6 months, 35.8% and 25.8%. The 2- and 5-year locoregional recurrence-free survival were 59.1% and 50.8%. The 2- and 5-year distant metastases-free survival were 74.6% and 65.9%. Multivariate analysis showed that EQD(2)>66 Gy was the only independent prognostic indicator for OS (P=0.040). The median survival time and 5-year OS rate significantly improved in patients who received EQD(2)>66 Gy than those who received≤66 Gy (31.2 months vs. 19.2 months, 40.1% vs. 19.1%, P=0.027). A total of 87 patients (58.8%) developed tumor progression. There were 50 (33.8%), 23 (15.5%) and 39 (26.4%) patients developed local, regional recurrence and distant metastases, respectively. Eleven patients (7.4%) underwent salvage surgery, and the laryngeal preservation rate for entire group was 93.9%. Conclusions: Definitive radiotherapy is an effective treatment for cervical esophageal carcinoma with the advantage of larynx preservation. Local recurrence is the major failure pattern. EQD(2)>66 Gy is associated with the improved overall survival.

[Treatment and prognosis analysis of perineural invasion on sinonasal adenoid cystic carcinoma]

Objective: To analyze the efficacy of sinonasal adenoid cystic carcinoma (ACC) with perineural invasion (PNI), and explore the prognostic value of PNI on sinonasal adenoid cystic carcinoma. Methods: The clinical data of 105 patients with sinonasal ACC admitted to Cancer Hospital, Chinese Academy of Medical Sciences from January 2000 to December 2016 were retrospectively reviewed. All patients were restaged according to American Joint Committee on Cancer 8th edition. Follow-up visits were conducted to obtain information of treatment failure and survival outcome. The Log rank test was used for univariate analysis of prognostic factors, and Cox regression model was used for multivariate prognostic analysis. Results: The maxillary sinus (n=59) was the most common primary site, followed by the nasal cavity (n=38). There were 93 patients with stage Ⅲ-Ⅳ. The treatment modalities included surgery alone (n=14), radiotherapy alone (n=13), preoperative radiotherapy plus surgery (n=10), and surgery plus postoperative radiotherapy (n=68). The median follow-up time was 91.8 months, the 5-year local control (LC), distant metastasis-free survival (DMFS), progression-free survival (PFS), and overall survival (OS) rates were 72.6%, 73.0%, 52.9% and 78.0%, respectively. There were 33 patients (31.4%) with PNI-positive. The 5-year DMFS, PFS, and OS rates of PNI-positive group were 53.7%, 29.4% and 56.5%, respectively, which were significantly inferior to those of PNI-negative group (80.8%, 63.0% and 86.8%, respectively, P<0.05), while there was no significant difference in the 5-year LC rate between both groups (64.5% vs 76.5%, P=0.273). The multivariate Cox regression analysis showed PNI was one of the poor prognostic factors of DMFS (HR=3.514, 95%CI: 1.557-7.932), PFS (HR=2.562, 95%CI: 1.349-4.866) and OS (HR=2.605, 95%CI: 1.169-5.806). Among patients with PNI-positive, the 5-year LC, PFS and OS rates of patients received surgery combined with radiotherapy were 84.9%, 41.3% and 72.7%, respectively, which were significantly higher than 23.3%, 10.0% and 26.7% of patients receiving surgery or radiotherapy alone (P<0.05). Conclusion: The presence of PNI increases the risk of distant metastasis in patients with sinonasal ACC. Compared with patients with PNI-negative, the prognosis of patients with PNI-positive is relatively poor, and surgery combined with radiotherapy for PNI-positive sinonasal ACC results in good clinical outcomes.

Impact of the Result of Continued Thrombolysis After Stenting Following Pharmacomechanical Thrombectomy for Iliofemoral Deep Vein Thrombosis-A Retrospective Study

Objective

The aim of this study is to compare the procedure and treatment outcomes of using either direct stenting alone following pharmacomechanical thrombectomy or continued catheter-directed thrombolysis after stenting for treatment of acute left iliofemoral deep vein thrombosis while clot removal degree achieved grade III.

Methods

From March 2018 to May 2019, 82 patients who underwent iliac venous stenting for treatment of acute left iliofemoral deep vein thrombosis with iliac vein stenosis after pharmacomechanical thrombectomy therapy using the AngioJet system while Clot removal degree achieved grade III were divided into two groups: Direct stenting alone group (n = 39) and continued catheter-directed thrombolysis after stenting group (n = 43). Comparisons were made regarding the treatment outcomes, stent patency rate, and Villalta scale between these two groups.

Results

No serious perioperative complications occurred. The mean urokinase dose and hospitalization time in the stenting alone group and continued catheter-directed thrombolysis after the stenting group were 0.30 million U versus 1.76 ± 0.54 million U and 4.85 ± 0.93 days versus 6.33 ± 1.02 days, (P < .001). In the first 30 days after the operation, there were 3 recurrent episodes of deep vein thrombosis in the stenting alone group (P = 0.064). Each patient has completed at least one year of follow-up, the mean follow-up was 15.95 ± 3.44 months. Overall cumulative stent patency rates were 87.2% in stenting alone group and 97.7% in continued catheter-directed thrombolysis after stenting group at 12months (P = 0.037). The Villalta scores at 12 months had a significant difference between the two groups. The mean Villalta scores in the stenting alone group and continued catheter-directed thrombolysis after the stenting group were 4.44 ± 1.63 and 1.63 ± 1.29, respectively (P < 0.001).

Conclusion

When the clot removal degree of pharmacomechanical thrombectomy thrombectomy reaches grade III, both stenting alone and continued catheter-directed thrombolysis after stenting are effective treatment modalities. For young patients with low bleeding risk, continued catheter-directed thrombolysis after stenting has a better patency rate and a lower 1-year post-thrombotic syndrome risk and does not increase major bleeding events. However, it may increase the time and costs of hospitalization accordingly.

Protective effects of lycopene on mitochondrial oxidative injury and dysfunction in the liver of aflatoxin B1-exposed broilers

This study was conducted to investigate the effects of lycopene (LYC) on mitochondrial oxidative injury and dysfunction in the liver of aflatoxin B₁ (AFB₁)-exposed broilers. A total of 192 healthy 1-day-old male broilers were randomly divided into 3 groups with 8 replicates of 8 birds each. Birds in the 3 groups were fed basal diet (control), basal diet with 100 µg/kg AFB₁, and basal diet with 100 µg/kg AFB₁ and 200 mg/kg LYC, respectively. The experiment lasted 42 d. The results showed that AFB₁ decreased average daily body weight gain (ADG), average daily feed intake, and gain to feed ratio (G :F) compared to the control group, the LYC supplementation increased ADG and G/F compared to AFB₁ group (P < 0.05). Broilers in the AFB₁ group had lower mitochondrial glutathione (mGSH) concentration and glutathione peroxidase (GSH-Px), manganese superoxide dismutase (MnSOD), and thioredoxin reductase activities, and higher hydrogen peroxide (H₂O₂) and reactive oxygen species (ROS) concentrations than the control group (P < 0.05). The LYC increased mGSH concentration and GSH-Px and MnSOD activities, and decreased H₂O₂ and ROS concentrations compared to AFB₁ group (P < 0.05). Broilers fed the AFB₁ diet showed increased mitochondrial swelling and decreased adenosine triphosphate concentration than the control group, and LYC had opposite effects (P < 0.05). The AFB₁ decreased the activities of mitochondrial electron transfer chain (ETC) complexes I, II, III, and V, downregulated the mRNA expression levels of hepatic MnSOD, thioredoxin 2, thioredoxin reductase, peroxiredoxin-3, peroxisome proliferator-activated receptor γ coactivator 1α, nuclear respiratory factor 1, and mitochondrial transcription factor A compared with the control group (P < 0.05), and LYC increased activities of mitochondrial ETC complexes III and V, and upregulated mRNA expression levels of these genes in comparison to AFB₁ group (P < 0.05). In conclusion, the LYC protected broilers from AFB₁-induced liver mitochondrial oxidative injury and dysfunction by stimulating mitochondrial antioxidant capacity and maintaining mitochondrial biogenesis.

[The characteristics and citation analysis of the publications in National Medical Journal of China during 2016]

Objective: To analyze the characteristics and citations of articles in National Medical Journal of China (NMJC) during 2016, and to discuss the academic level and quality of the journal. Methods: All the literature published in NMJC during 2016 were retrieved through the Chinese Medical Citation index, and the citation frequency data in China's core journals of science and technology from January 2017 to December 2018 was obtained through Institute of Scientific and Technical Information of China. The citation status of articles published in NMJC was statistically analyzed by the method of literature metrology. The main indicators included the citation rate of articles published in each year, the citation frequency of all articles, the citation status of individual papers and authors, the regional and high-yield institution distribution of cited authors, and the main citation journals. Results: In 2016, a total of 962 articles were published in 22 columns of NMJC. The total number of published pages was 3 940, and the average number of articles was 4.09 pages. A total of 28 key topics have been published. The total citation was 2 077 times, with 2.16 times per paper. Among them, 322 papers were not cited, accounting for 33.47%. The maximum citation frequency of a single paper was 66 times. There were good citations in the columns of Guidelines, Epidemiology, New technology and methods, Clinical research and Editorial. Oncology, neurology/psychiatry, imaging/ultrasound/radiology, respiratory medicine and orthopedics accounted for a large part [40.43% (389 articles)]. Articles in neurosurgery, respiratory medicine, preventive medicine and gastrointestinal surgery were all cited with high frequency (all ≥2.75 times/article). A total of 483(50.21%) articles had obtained fund support, and the rate (68.12%) of them cited was slightly higher than that of articles without fund support (64.93%). A total of 23 articles were cited ≥10 times, and 16 first authors were cited ≥10 times. In addation, 26 corresponding authors were cited ≥10 times and 10 institutions were cited more than 15 times. The authors of the cited papers were distributed in 29 provinces (autonomous regions, municipalities directly under the central government), and there were more articles and higher total citation frequency in Beijing, Shanghai, Jiangsu and Tianjin. From 2017 to 2018, papers published in NMJC were cited 2 077 times by a total of 490 journals. Conclusions: The guidelines published in NMJC is highly cited. The editorial department should adjust the column setting timely, strengthen the planning of key topic selection and the solicitation and publicity of excellent papers, and further improve the influence of the magazine.

Endovascular treatment for long segment iliac artery occlusion involving the iliac artery opening

OBJECTIVE

This retrospective nonrandomized study investigated the outcomes of endovascular therapy for long-segment iliac artery occlusion involving the iliac artery opening.

METHODS

During a 5-year period (from Mar 2012 to Mar 2017), 32 patients (two women and 30 men; mean age, 69.0 years; range, 51-90 years) received endovascular therapy, with or without catheter-directed thrombolysis (CDT), for long-segment iliac artery occlusion (mean lesion length, 129.8 mm; range, 74.7-189.3 mm).

RESULTS

The technical success rate was 90.6% (29 of 32). The major complication rate was 3.5%, but no in-hospital mortality was recorded. The access site complication rate was 10.3%. The clinical symptoms of 29 patients were significantly improved. All 29 patients were followed up for 6-40 months, with an average of 16.7 ± 10.9 months. The primary patency rates were 96.6 ± 3.4% at 6 months, 86.6 ± 7.3% at 12 months, 79.4 ± 9.6% at 24 months, and 66.2 ± 14.5% at 36 months.

CONCLUSIONS

Depending on the characteristics of the disease, endovascular treatment with an individualized, rational choice of approach and with fine-tuning of the operation is a safe and effective treatment for long-term iliac artery occlusion involving the opening of the iliac arteries. Customization of the treatment is also the key to a successful operation and to ensuring good postoperative efficacy.

[Factor analysis of diagnosis and surgical treatment of local regional recurrence in breast cancer patients]

Objective: To analyze the association between clinicopathological factors and clinical diagnosis, treatment and surgery of local regional recurrence (LRR) in breast cancer. Methods: A retrospective study was done to evaluate consecutive 7 823 breast cancer LRR cases between January 2009 and August 2018 at Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong University School of Medicine. A total of 108 LRR patients were enrolled: 35 cases (32.4%) with ipsilateral breast tumor recurrence (IBTR) after breast conserving surgery, 40 cases (37.0%) of chest wall recurrence (CR), and 33 cases (30.6%) with regional lymph node recurrence (LNR). All patients were female, aged from 26 to 83 years with a mean of 49 years. Clinicopathological factor and its relationship with different sites of LRR and following surgical choice were analyzed by χ(2) test, rank-sum test and Logistic regression. Survival analysis were performed between different LRR patterns and whether undergoing second surgery. Kaplan-Meier survival curves and Log-rank tests demonstrated the distribution of overall survival. Results: Both univariate analysis and multivariate analysis found that axillary lymph nodes (ALN) status (OR=7.27, 95% CI: 1.30 to 40.53, P=0.042) and disease-free interval (OR=0.18, 95% CI: 0.06 to 0.60, P=0.013) were related to different site of LRR. Compared with patients with IBTR, LNR and CR patients had a higher rate of ALN metastasis and a shorter disease-free interval. A total of 36 LRR patients underwent following surgery. In univariate analysis, initial ALN surgery (χ(2)=16.705, P=0.001), pathological type (χ(2)=7.047, P=0.03), ALN status (χ(2)=10.812, P=0.002), disease-free interval (χ(2)=6.118, P=0.023) and LRR site(χ(2)=19.328, P=0.000) were associated with surgical treatment for LRR patients. Multivariate analysis demonstrated that only site of LRR was independently associated with surgery (OR=0.17, 95% CI: 0.05 to 0.65, P=0.024). The 5-year overall survival was 100% and 60.1% (P=0.018) for LRR patients treated with surgery or not. Furthermore, CR patients had significantly worse overall survival than LNR and IBTR patients, with 5-year overall survival 53.1%, 73.5%, and 100% respectively (P=0.021). Conclusions: Initial lymph nodes metastasis and disease-free interval are associated with different site of LRR. LRR site significantly influenced following surgery choice after LRR, which are both related with overall survival after LRR.

[Strategies of surgical and comprehensive management of breast cancer patients with local regional recurrence]

Breast conserving surgery and sentinel lymph node biopsy are widely used in early breast cancer treatment. Right now, the mode of local regional recurrence (LRR) has significantly changed and the rate of ipsilateral breast tumor recurrence and axillary lymph node recurrence are steadily increasing. Due to its relatively low incidence of LRR compared with distant metastasis, inconsistent of pre-recurrence treatment, difficulty in surgical treatment, and few prospective clinical studies, there are rising new challenges for clinical management of LRR patients. In this article, based on new theory of LRR, clinical diagnosis and treatment progress, and our own clinical practice experience for LRR breast cancer patients, we propose that we should make pathological diagnosis and do systemic evaluation for LRR disease, then considering it as a curable disease, and integrating local and systemic comprehensive treatment for LRR patients, thus to improve their disease outcome.

Transcriptome analysis of hepatic gene expression and DNA methylation in methionine- and betaine-supplemented geese (Anser cygnoides domesticus)

Dietary methionine (Met) restriction produces a coordinated series of transcriptional responses in the liver that limits growth performance and amino acid metabolism. Methyl donor supplementation with betaine (Bet) may protect against this disturbance and affect the molecular basis of gene regulation. However, a lack of genetic information remains an obstacle to understand the mechanisms underlying the relationship between Met and Bet supplementation and its effects on genetic mechanisms. The goal of this study was to identify the effects of dietary supplementation of Met and Bet on growth performance, transcriptomic gene expression, and epigenetic mechanisms in geese on a Met-deficient diet. One hundred and fifty 21-day-old healthy male Yangzhou geese of similar body weight were randomly distributed into 3 groups with 5 replicates per treatment and 10 geese per replicate: Met-deficient diet (Control), Control+1.2 g/kg of Met (Met), and Control+0.6 g/kg of Bet (Bet). All geese had free access to the diet and water throughout rearing. Our results indicated that supplementation of 1.2 g/kg of Met in Met-deficient feed increased growth performance and plasma homocysteine (HCY) levels, indicating increased transsulfuration flux in the liver. Supplementation of 0.6 g/kg Bet had no apparent sparing effect on Met needs for growth performance in growing geese. The expression of many genes critical for Met metabolism is increased in Met supplementation group. In the Bet-supplemented group, genes involved in energy production and conversion were up-regulated. Dietary supplementation with Bet and Met also altered DNA methylation. We observed changes in the methylation of the LOC106032502 promoter and corresponding changes in mRNA expression. In conclusion, Met and Bet supplementation in geese affects the transcriptional regulatory network and alters the hepatic DNA methylation of LOC106032502.

Next-gen sequencing identifies non-coding variation disrupting miRNA-binding sites in neurological disorders

Understanding the genetic factors underlying neurodevelopmental and neuropsychiatric disorders is a major challenge given their prevalence and potential severity for quality of life. While large-scale genomic screens have made major advances in this area, for many disorders the genetic underpinnings are complex and poorly understood. To date the field has focused predominantly on protein coding variation, but given the importance of tightly controlled gene expression for normal brain development and disorder, variation that affects non-coding regulatory regions of the genome is likely to play an important role in these phenotypes. Herein we show the importance of 3 prime untranslated region (3'UTR) non-coding regulatory variants across neurodevelopmental and neuropsychiatric disorders. We devised a pipeline for identifying and functionally validating putatively pathogenic variants from next generation sequencing (NGS) data. We applied this pipeline to a cohort of children with severe specific language impairment (SLI) and identified a functional, SLI-associated variant affecting gene regulation in cells and post-mortem human brain. This variant and the affected gene (ARHGEF39) represent new putative risk factors for SLI. Furthermore, we identified 3'UTR regulatory variants across autism, schizophrenia and bipolar disorder NGS cohorts demonstrating their impact on neurodevelopmental and neuropsychiatric disorders. Our findings show the importance of investigating non-coding regulatory variants when determining risk factors contributing to neurodevelopmental and neuropsychiatric disorders. In the future, integration of such regulatory variation with protein coding changes will be essential for uncovering the genetic causes of complex neurological disorders and the fundamental mechanisms underlying health and disease.

S-1 chemotherapy and intensity-modulated radiotherapy after D1/D2 lymph node dissection in patients with node-positive gastric cancer: a phase I/II study

BACKGROUND

This phase I/II clinical trial investigated S-1 administered with intensity-modulated radiotherapy (IMRT) as adjuvant therapy for node-positive gastric cancer. Patients had undergone radical resection and D1/D2 lymph node dissection.

METHODS

In phase I, patients received adjuvant chemoradiotherapy of IMRT (45 Gy in 25 fractions) with concurrent S-1 administered on a dose-escalation schedule to determine the recommended dose (RD). In phase II, the safety and efficacy of the RD of S-1 combined with IMRT were assessed.

RESULTS

We consecutively enrolled 73 patients (56 men; median age, 53 years; range, 29-73 years) and the phase I portion of the study included 27 patients. The RD of S-1 administered concomitantly with IMRT was 80 mg m^-2 day^-1 orally, twice daily. The phase II analysis included 52 patients (46 new patients plus 6 from phase I). 8 patients (15.4%) developed grade 3 or 4 toxicities. There were 21 recurrence events and 15 deaths (1 bowel obstruction, 14 gastric cancer). Three-year disease-free survival and overall survival were 62.2% (95% confidence interval (CI), 48.5-75.9) and 70.0% (95% CI, 56.3-83.7), respectively. The median time to recurrence was 17.5 months (range, 3.8-42.0). The median time from recurrence to death was 7.0 months (range, 1.5-28.7).

CONCLUSIONS

S-1 combined with IMRT adjuvant chemoradiotherapy is safe and efficacious for advanced gastric cancer.

Cooperative polariton dynamics in feedback-coupled cavities

The emerging field of cavity spintronics utilizes the cavity magnon polariton (CMP) induced by magnon Rabi oscillations. In contrast to a single-spin quantum system, such a cooperative spin dynamics in the linear regime is governed by the classical physics of harmonic oscillators. It makes the magnon Rabi frequency independent of the photon Fock state occupation, and thereby restricts the quantum application of CMP. Here we show that a feedback cavity architecture breaks the harmonic-oscillator restriction. By increasing the feedback photon number, we observe an increase in the Rabi frequency, accompanied with the evolution of CMP to a cavity magnon triplet and a cavity magnon quintuplet. We present a theory that explains these features. Our results reveal the physics of cooperative polariton dynamics in feedback-coupled cavities, and open up new avenues for exploiting the light-matter interactions.

[Clinical utility study of 21-gene assay in 927 Chinese patients with early breast cancer]

Objective: To investigate the distribution patterns of 21-gene assay and its influencing factors in Chinese patients with early breast cancer. Methods: Nine hundred and twenty-seven early breast cancer patients were retrospectively recruited from January 2009 to December 2015 at Ruijin Hospital, Shanghai Jiaotong University School of Medicine. The 21-gene reverse transcriptase-polymerase chain reaction(RT-PCR) assay were conducted in paraffin-embedded tumor tissues to calculate the Recurrence Score(RS). Immunohistochemistry(IHC) assay was used to measure the expression levels of estrogen receptor(ER), progesterone receptor(PR) and Ki-67. Concordances of RT-PCR and IHC results were assessed. Correlations of RS and classical clinicopathological factors were evaluated, and logistic regression were applied to determine independent predictive factors for RS. Results: The median RS of 927 patients was 23(range: 0~90), and the proportions of patients categorized as having a low, intermediate, or high risk were 26.5%, 47.7% and 25.8%, respectively. The distribution of RS varied significantly according to different tumor grade, T stage, PR status, Ki-67 index and molecular subtypes(P<0.05 for all). Grade, PR status and Ki-67 index were independent predictive factors for RS. ER, PR status and Ki-67 index showed significantly correlation between RT-PCR and IHC assays, and the concordance rates for ER and PR status were 98.7% and 87.8%, respectively. Conclusions: RS significantly correlated with tumor grade, T stage, PR status, Ki-67 index and subtypes. Grade, PR status and Ki-67 index can independently predict RS. Remarkable concordances of ER, PR status and Ki-67 index are found between RT-PCR and IHC assays.

[Surgical treatment and prognosis of ductal carcinoma in situ: 526 cases analysis]

Objective: To evaluate the choice of surgical treatment of ductal carcinoma in situ (DCIS) and its impact on long-term outcomes. Methods: A retrospective analysis of the clinicopathological features and treatment protocol of DCIS patients who underwent surgical treatment in Comprehensive Breast Health Center, Ruijin Hospital, Shanghai Jiaotong University School of Medicine from January 2009 to August 2016 was done. The factors which could affect surgical treatment were analyzed by χ(2) test and Logistic regression. Survival analysis were performed between different surgical approaches. Kaplan-Meier survival curves and Log-rank tests demonstrated the distribution of disease free survival and overall survival. Results: A total of 526 patients were enrolled in this study, 405 cases (77.0%) underwent mastectomy, 121 cases (23.0%) underwent breast-conserving surgery, of which 88 cases received radiotherapy after breast-conserving surgery. It was shown by univariate and multivariate analysis that age>50 years (OR=0.631, 95% CI: 0.413 to 0.965, P=0.034), first symptom of nipple discharge (OR=0.316, 95% CI: 0.120 to 0.834, P=0.020), excision biopsy (OR=1.831, 95% CI: 1.182 to 2.835, P=0.007) and tumor size >3 cm (OR=0.422, 95% CI: 0.206 to 0.864, P=0.018) were significantly correlated with choice of surgical treatment for breast lesions. Axillary lymph node dissection was performed for 118 cases (22.4%), with sentinel lymph node biopsy for 327 cases (62.2%), and none for 81 cases (15.4%). There was significant statistical difference in the choice of axillary lymph node management in patients of different age (χ(2)=8.124, P=0.017), biopsy type (χ(2)=35.567, P=0.000), breast operation type (χ(2)=149.118, P=0.000) and tumor size (χ(2)=13.394, P=0.010). The 5-year disease free survival rates was 95.7%, 89.6% and 100%, respectively, for mastectomy group, breast-conserving surgery group and breast-conserving surgery plus radiotherapy group. And the 5-year overall survival rates for three groups were 99.0%, 100% and 100%. The differences were not statistically significant (P=0.427, 0.777). Conclusions: For DCIS patients, age, first symptom and tumor size are independent predictors of breast surgery. The choice of axillary lymph node surgery is influenced by age, biopsy, operation type, and tumor size. Different surgical treatment options has no significant effect on disease-free survival and overall survival in DCIS patients.

[Effect of 21-gene recurrence score on chemotherapy decisions for patients with estrogen receptor-positive, epidermal growth factor receptor 2-negative and lymph node-negative early stage-breast cancer]

Objective: To investigate the effect of 21-gene recurrence score on adjuvant chemotherapy decisions for patients with estrogen receptor (ER)-positive, epidermal growth factor receptor 2 (HER-2)-negative and lymph node (LN)-negative early stage-breast cancer. Methods: One hundred and forty-eight patients with ER+ , HER-2- and LN- early stage breast cancer were recruited in the Ruijin hospital, Shanghai Jiao Tong University School of Medicine. The 21-gene recurrence score (RS)assay was performed and systemic therapeutic decisions were made before and after knowing the RS results under multidisciplinary discussion. The effects of RS assay and the other influential factors on adjuvant chemotherapy decision were further analyzed. Results: After knowing the RS results, treatment decisions were changed in 26 out of 148 patients(17.6%). Among them, 9 out of 26 patients were not recommended for chemotherapy; 16 of 26 had treatment recommendation changed to chemotherapy, and chemotherapy regimen was changed in the last one patient. Multivariate analysis showed that RS, age and histological grade were independent factors of decision-making for adjuvant chemotherapy. Conclusion: Our results suggest that 21-gene recurrence score significantly influences decision making for adjuvant chemotherapy in patients with ER+ , HER-2- and LN- early stage breast cancer.

[Analysis of the factors influencing adjuvant chemotherapy decisions for triple negative breast cancer]

Objective: To analyze adjuvant chemotherapy decisions for triple negative breast cancer (TNBC), and explore the influencing factors in the multidisciplinary treatment (MDT) modality. Methods: A retrospective analysis was performed. The cases with invasive TNBC who underwent surgery and MDT discussion for adjuvant treatment in Ruijin Hospital, from April 2013 to June 2015, were recruited. The patients' clinicopathological characteristics were analyzed and adjuvant treatment suggestions from MDT were obtained. Here the chemotherapy decision alteration was defined as a disagreement in chemotherapy or not, or inconsistence in regimens between the attending doctor and the multidisciplinary team. Results: A total of 194 patients aged ≤70 years old were enrolled in the multidisciplinary discussion, and 187 patients (96.4%) were suggested to receive chemotherapy. When compared the opinions of the attending doctor to suggestions of the multidisciplinary team, we found that the percentage of chemotherapy decision alteration reached 22.7% (39/172), of which 94.9% (37/39) were inconsistence in chemotherapy regimens. There were 119 patients who were recommended to receive epirubicin plus cyclophosphamide (EC) followed by docetaxel (T) or weekly paclitaxel (wP) regimens. Before the announcement of results for the E1199 trial, EC-T accounted for 62.5% (55/88), and EC-wP accounted for 37.5% (33/88) for this group of patients. After that, the proportion of EC-T was decreased to 22.6% (7/31) and proportion of EC-wP increased to 77.4%(24/31) (P<0.001). In addition, a total of 20 patients were suggested to receive platinum based chemotherapy. The proportions were 9.3% in cases with invasive ductal carcinoma, and 33.3% in cases with metaplastic carcinoma, respectively (P=0.016). Conclusions: The adjuvant chemotherapy decision for TNBC patients is altered in 22.7% of the patients after MDT discussion. After the announcement of SABCS E1199 results, more patients are suggested to receive EC followed by weekly paclitaxel. There is a lack of detailed evidence for platinum based adjuvant chemotherapy for TNBC, and more patients with metaplastic carcinoma receive platinum based adjuvant chemotherapy.

Zigzag C2N nanoribbons with edge modifications as multi-functional spin devices

Recently, a holey two-dimensional (2D) C₂N crystal with a wide band gap has been successfully synthesized. However, its non-magnetic property largely limits real applications in spintronics. Here we find that edge magnetism can be introduced by tailoring the holey 2D C₂N crystal into nanoribbons with zigzag edges. When edge N atoms are bare or passivated by H atoms, the device can be used to design high-performance thermospin devices and thermal rectifiers. This is ascribed to the emergence of a spin semiconducting property with a wide band gap. Moreover, if the edge N atoms are passivated by O atoms, the device shows a half-metallic property; meanwhile an obvious spin Seebeck effect can also be observed when a temperature difference is applied across the device.

Endovascular Repair of a Large Abdominal Aortic Aneurysm in a Patient Presenting with Lower Extremity Edema as a Result of Inferior Vena Cava Thrombosis

PURPOSE

Abdominal aortic aneurysm (AAA) can present with symptoms because of aneurysmal compression of adjacent organ systems. This condition has always been treated by open surgical repair. Here, we report a case of an AAA complicated by inferior vena cava (IVC) thrombosis and deep venous thrombosis (DVT) due to IVC compression by aneurysm successfully treated by endovascular aneurysm repair (EVAR).

CASE REPORT

A 50-year-old man was presented with 3-day right lower extremity edema. He was diagnosed with acute DVT and IVC thrombosis initially. Anticoagulation therapy and catheter-directed thrombolysis under the protection of IVC filter were performed. Subsequent imaging revealed a 9.5-cm infrarenal AAA compressing the IVC. The patient was transferred to our hospital and underwent EVAR successfully.

CONCLUSIONS

EVAR is a viable treatment option for patients with an AAA complicated by IVC thrombosis and DVT due to IVC compression by aneurysm.

[Multi-gene assay profiling testing and individualized therapy in breast cancer]

Breast cancer is a heterogenetic disease. Multi-gene assay profiling can classify breast cancer into several molecular subtypes, which is better to predict disease prognosis and treatment response. Two prospective clinical trials validated the prognosis predictive value of 21 gene recurrence score and MammaPrint in early breast cancer, than to decrease the prescription of adjuvant chemotherapy and avoid side effect of chemotherapy. New multi-gene assay profiling integrating clinic-pathological factors or reflecting disease development and metastasis can help us predict disease outcome better, thus to achieve individualized therapy in breast cancer.

Construction of a genetic linkage map and identification of QTL associated with growth traits in Malus sieversii

110 F(1) individuals of apple were obtained by crossing between a good quality cultivar'Red Fuji'ofMalus domestica and an accession'Hongrou Apple'ofMalus sieversi. Using Joinmap3.0, a molecular genetic linkage map of Malus sieversii was constructed by 175 SSR and 105 SRAP markers which were integrated into 17 linkage groups and spanned 1299.67cM in genome with an average distance of 4.6cM between the markers. By using interval mapping method,17 QTLs for eight growth traits of Malus sieversii were detected, including 2 QTLs for tree height on cl and c16, 2 QTLs for stem height on c7, 2 QTLs for stem thickness on c3, 2 QTLs for new shoot length on c15 and c16, 2 QTLs for new shoot diameter on c2, 3 QTLs for internode number on c1, c2 and c2, 2 QTLs for internode length on c 1 and c2, 2 QTLs for lenticel density on c17, respectively. The phenotypic variations explained by each QTL ranged from 10.15% to 41.66%, and their LOD values varied from 2.54 to 4.53, of which five QTLs were major effect genes (LOD≥3.5).

Carbon-based molecular devices: Fano effects controlled by the molecule length and the gate voltage

Fano effect is an important quantum phenomenon in mesoscopic systems, which arises from an interference between the localized state and the extended state. Here we observe an obvious Fano effect near the Fermi level in an all-carbon molecular device consisting of an acene molecule sandwiched between two zigzag graphene nanoribbon (ZGNR) electrodes. By increasing the length of the molecule, an extended state gradually evolves into a localized state. With the aid of the nearby extended state, a Fano effect is achieved. Using a gate voltage, we can easily tune the Fano effect induced by the single-transmission channel. When the spin degree of freedom is involved, the all-carbon device can show a half-metallic property with positive or negative 100% spin polarization at the Fermi level under the gate voltage; meanwhile the spin thermoelectric effect can also be enhanced.

Scaled Particle Theory for Multicomponent Hard Sphere Fluids Confined in Random Porous Media

The formulation of scaled particle theory (SPT) is presented for a quite general model of fluids confined in a random porous media, i.e., a multicomponent hard sphere (HS) fluid in a multicomponent hard sphere or a multicomponent overlapping hard sphere (OHS) matrix. The analytical expressions for pressure, Helmholtz free energy, and chemical potential are derived. The thermodynamic consistency of the proposed theory is established. Moreover, we show that there is an isomorphism between the SPT for a multicomponent system and that for a one-component system. Results from grand canonical ensemble Monte Carlo simulations are also presented for a binary HS mixture in a one-component HS or a one-component OHS matrix. The accuracy of various variants derived from the basic SPT formulation is appraised against the simulation results. Scaled particle theory, initially formulated for a bulk HS fluid, has not only provided an analytical tool for calculating thermodynamic properties of HS fluid but also helped to gain very useful insight for elaborating other theoretical approaches such as the fundamental measure theory (FMT). We expect that the general SPT for multicomponent systems developed in this work can contribute to the study of confined fluids in a similar way.

[Factors related to adjuvant ovarian function suppression in premenopausal breast cancer patients]

OBJECTIVE

To analyze the applied condition of ovary function suppression (OFS) before and after joint analysis of TEXT and SOFT trials and SOFT trial, and to identify the relevant factors of OFS usage.

METHODS

The analysis was performed in premenopausal women with hormone receptor (HR) positive breast cancer receiving surgical treatment from Apr 2013 to Oct 2015 in Ruijin Hospital, Shanghai Jiaotong University School of Medicine. Adjuvant treatment strategy was made in the multidisciplinary team (MDT) meetings. We analyzed the applied condition of OFS before and after joint analysis, SOFT trial and its relevant factors.

RESULTS

Among 454 patients, 114 (25.1%) patients received OFS. Before the results of joint analysis came out, all the patients (38/38) received OFS together with tamoxifen (TAM); after the results came out, clinicians began to put OFS with exemestane into practice, among 76 patients, 41(53.9%) patients received OFS with exemestane while 35 (46.1%) patients received OFS together with TAM. Before the results of SOFT trial came out, 71 out of 310 (22.9%) patients received OFS while 43 out of 144 (29.9%) patients received OFS after that. No significant difference was found between the proportion of patients receiving OFS before and after the results of SOFT trial came out (P=0.112). Age, histological grade, pN status, Ki-67 status, molecular subtype and acceptance of chemotherapy were correlated with OFS treatment (P<0.05). Age, tumor grade and pN were independent significant predictors of OFS usage.

CONCLUSIONS

After the results of joint analysis came out, clinicians began to apply OFS with exemestane to premenopausal women with HR positive breast cancer. There is no significant difference between the proportion of patients receiving OFS before and after SOFT trial. Age, tumor grade and pN status are independent significant predictors of OFS treatment. Patients younger than 40, with histological grade Ⅱ or Ⅲ tumor and with pN1 or pN2 status are prone to receive OFS.

Evaluation in vivo of autologous cell derived vein grafts based on tissue engineering concept

AIM

Aim of the study was to construct and evaluate of autologous cell derived vein grafts based on tissue engineering concept.

METHODS

In this study, we constructed venous grafts (VGs) in 12 days based on tissue engineering concept. We draw out 8-12 mL of bone marrow from the intended recipient canines (N.=8) to culture and expand endothelial progenitor cells (EPCs). After having been labeled with PKH26-GL, the cells were seeded onto the luminal surface of decellularized scaffolds (DSs) with single, rotative method for 4 hours. Following static culture for 24-72 hours, the hybrids were implanted to recipient canine inferior vena cava. Non-seeded DSs (N.=4) were performed as control.

RESULTS

Angiography disclosed that patent number of test (control) group were 7/7 (2/4), 6/6 (2/2) and 4/4 (1/2) at postoperative 10 days, 4 weeks and 12 weeks, respectively. At 12 weeks, confluenced endothelial cells which covered the whole inner luminal surface of the explants were detected. Meanwhile, fibroblasts and α-actin positive cells in the matrices were found. PKH26-GL labeled EPCs sustained on the luminal surface accompanied by newly formed endothelial cells. However, the explants in both groups showed partial stenosis.

CONCLUSION

These results indicate that such constructed VGs based on autologous bone marrow-derived EPCs and porcine DSs are promising and deserve to further improvement and testing.

Molecular cloning and characterization, and prokaryotic expression of the GnRH1 gene obtained from Jinghai yellow chicken

The gonadotropin-releasing hormone (GnRH) plays an important role in the control of reproductive functions. Recent studies have reported the occurrence of GnRH molecular variants in numerous species. In this study, the GnRH1 gene from Jinghai yellow chicken was cloned by reverse transcriptase-polymerase chain reaction and transformed into BL21 (DE3) competent cells. The GnRH1 gene and amino acid sequences were subjected to bioinformatic analyses. The GnRH1 gene nucleotide sequence was discovered to be 352 bp long, containing a coding, promoter, and section of the 3'-regions. The GnRH1 gene shared 93, 81, 54, 58, 61, 76, 76, 59, 76, and 66% sequence identity with Meleagris gallopavo, Columba livia, Homo sapiens, Bos taurus, swines, Capra hircus, Ovis aries, Pantholops hodgsonii, Equus caballus, and Rattus norvegicus, respectively. The GnRH1 gene showed conserved domains. The GnRH1 protein was a secreted protein comprising 92 amino acids, with a molecular weight of 10205.6 Da and a theoretical pI of 5.67. Most of the amino acid residues were observed to be hydrophilic, indicating water solubility. The predicted secondary structures of proteins included α-helices (h; 23.08%), β-extensions (e; 10.92%), and random coils (c; 66.0%). The successful construction of prokaryotic expression vector pET32a-GnRH1 was confirmed by restriction and sequence analysis. SDS-PAGE analysis showed the successful expression of recombinant plasmid in Escherichia coli BL21 (molecular weight = 25-28 kDa). Larger quantities of protein were expressed in supernatant, indicating greater expression in soluble form. Western blot analysis confirmed the expression of the target protein.

Current noise in three-terminal hybrid quantum point contacts

We investigate the current noise of three-terminal hybrid structures at arbitrary bias voltages. Our results indicate that the noise can be a useful tool to extract dynamical information in multi-terminal hybrid structures. The zero-frequency noise is sensitive to the coupling with a normal lead. As a result, the characteristic multiple-step structure of the noise Fano factor due to multiple Andreev reflection will be suppressed as we increase this coupling. In addition, the internal dynamics due to processes of Andreev reflection and multiple Andreev reflection raises rich features in the noise spectrum corresponding to the energy differences of various dynamical processes.

Ground penetrating detection using miniaturized radar system based on solid state microwave sensor

We propose a solid-state-sensor-based miniaturized microwave radar technique, which allows a rapid microwave phase detection for continuous wave operation using a lock-in amplifier rather than using expensive and complicated instruments such as vector network analyzers. To demonstrate the capability of this sensor-based imaging technique, the miniaturized system has been used to detect embedded targets in sand by measuring the reflection for broadband microwaves. Using the reconstruction algorithm, the imaging of the embedded target with a diameter less than 5 cm buried in the sands with a depth of 5 cm or greater is clearly detected. Therefore, the sensor-based approach emerges as an innovative and cost-effective way for ground penetrating detection.

The role of smoking status and collagen IX polymorphisms in the susceptibility to cervical spondylotic myelopathy

We investigated a possible association of collagen IX tryptophan (Trp) alleles (Trp2 and Trp3) and smoking with cervical spondylotic myelopathy (CSM) in 172 Chinese patients and 176 age- and gender-matched controls. The smoking status was evaluated by smoking index (SI). The CSM cases had a significantly higher prevalence of Trp2 alleles (Trp2+) than controls (19.8 vs 6.2%, P = 0.002), but the prevalence of Trp3 alleles (Trp3+) was similar between the two groups (23.3 vs 21.6%, P = 0.713). Logistic regression analyses showed that the subjects with Trp2+ had a higher risk for CSM. We thus analyzed whether smoking status influenced the association between Trp2 alleles and CSM risk. Among Trp2+ subjects with an SI less than 100, the smoking status did not influence the effect of risk for SCM [odds ratio (OR) = 1.34, 95% confidential interval (95%CI) = 0.85-2.18, P > 0.05]. When SI increased from 101 to 300, the OR for CSM reached 3.34 (95%CI = 2.11-5.67, P = 0.011); when SI was more than 300, the OR for CSM reached 5.56 (95%CI = 3.62-7.36, P < 0.001). Among Trp2- subjects with SI more than 300, the OR for CSM increased 2.14 (95%CI = 1.15-4.07, P = 0.024). We found a significant association between the Trp2 alleles and CSM risk and smoking amplifies this risk, suggesting that smoking abstinence is important for reducing CSM occurrence in subjects with high genetic risk.

Observation of electron-antineutrino disappearance at Daya Bay

The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle θ(13) with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GWth reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With a 43,000 ton-GWth-day live-time exposure in 55 days, 10,416 (80,376) electron-antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R=0.940±0.011(stat.)±0.004(syst.). A rate-only analysis finds sin(2)2θ(13)=0.092±0.016(stat.)±0.005(syst.) in a three-neutrino framework.

Single sevoflurane exposure decreases neuronal nitric oxide synthase levels in the hippocampus of developing rats

BACKGROUND

The use of general anaesthetics in young children and infants has raised concerns regarding the adverse effects of these drugs on brain development. Sevoflurane might have harmful effects on the developing brain; however, these effects have not been well investigated.

METHODS

Postnatal day 7 (P7) Sprague-Dawley rats were continuously exposed to 2.3% sevoflurane for 6 h. We used the Fox battery test and Morris water maze (MWM) to examine subsequent neurobehavioural performance. Cleaved caspase-3 and neuronal nitric oxide synthase (nNOS) were quantified by immunoblotting, and the Nissl staining was used to observe the histopathological changes in the hippocampus.

RESULTS

A single 6 h sevoflurane exposure at P7 rats resulted in increased cleaved caspase-3 expression and decreased nNOS levels in the hippocampus, and induced the loss of pyramidal neurones in the CA1 and CA3 subfields of the hippocampus at P7-8. These changes were accompanied by temporal retardation of sensorimotor reflexes. However, neither the Fox battery test at P1-21 nor the MWM test at P28-32 showed differences between the air- and sevoflurane-treated groups.

CONCLUSIONS

Although early exposure to sevoflurane increases activated caspase-3 expression and neuronal loss and decreases nNOS in the neonatal hippocampus, it does not affect subsequent neurobehavioural performances in juvenile rats.

Ferromagnetism in semihydrogenated graphene sheet

Single layer of graphite (graphene) was predicted and later experimentally confirmed to undergo metal-semiconductor transition when fully hydrogenated (graphane). Using density functional theory we show that when half of the hydrogen in this graphane sheet is removed, the resulting semihydrogenated graphene (which we refer to as graphone) becomes a ferromagnetic semiconductor with a small indirect gap. Half-hydrogenation breaks the delocalized pi bonding network of graphene, leaving the electrons in the unhydrogenated carbon atoms localized and unpaired. The magnetic moments at these sites couple ferromagnetically with an estimated Curie temperature between 278 and 417 K, giving rise to an infinite magnetic sheet with structural integrity and magnetic homogeneity. This is very different from the widely studied finite graphene nanostrucures such as one-dimensional nanoribbons and two-dimensional nanoholes, where zigzag edges are necessary for magnetism. From graphene to graphane and to graphone, the system evolves from metallic to semiconducting and from nonmagnetic to magnetic. Hydrogenation provides a novel way to tune the properties with unprecedented potentials for applications.

Primary molecular features of self-incompatible and self-compatible F(1) seedling from apricot (Prunus armeniaca L.) Katy x Xinshiji

Expression of the S-RNase genes in the self-compatible (SC) apricot (Prunus armeniaca L.) cultivar Katy, the self-incompatible (SI) cultivar Xinshiji and their F(1) seedling was examined in this study. Three S-genotypes, S(9)Sc (Sc, self-compatibility S-gene absent from the style), S(8)S(9), and S(8)S(10), were obtained. Seedlings with S-RNase that migrated as a single band in gel electrophoresis were SC, despite high transcript abundance, and those with S-RNase that migrated as two bands were SI with high transcript abundance or SC with low transcript expression. S(8)-RNase was induced in SI cultivars only 24 h after self-pollination, indicating post-transcriptional regulation of S(8)-RNase in SI apricots. A Proteomic study showed that 35 protein spots were synthesized differently between SC and SI pistils. Fifteen of the 35 protein spots were identified; nine proteins, including receptor protein kinase-like protein, reversibly glycosylated polypeptide-2, and isoflavone reductase-like protein, were detected only in the SC pistils; while nine proteins, including actin 7, a putative serine/threonine kinase, and S-RNase, were detected only in the SI pistils. A mitochondrial NAD-dependent malate dehydrogenase and a probable elongation factor G were up-regulated, while heat shock cognate 70 was down-regulated in the SC pistils compared to those in the SI pistils. The results suggest that the proteins responsible for self-compatibility and self-incompatibility may be different.

[Simple analysis on professor ZHANG Dao-Zong's academic thought of dredging the Governor Vessel and regulating mentality]

Introduce Professor Zhang Dao-zong's studies on the Governor Vessel and its academic thought of dredging the Governor Vessel and regulating mentality, and clinical experiences of dredging the Governor Vessel and regulating mentality therapy for apoplexy, epilepsy, vertigo, ankynosing spondylitis, traumatic paraplegia, child Tourette's disease, etc....

Thermodynamic pressure of a fluid confined in a random porous medium

Up to now, none of the previously derived expressions is usable in simulations for the practical calculation of the thermodynamic pressure of a fluid adsorbed in a random porous medium. A bona fide virial expression of this pressure is presented. Contrary to what was believed, we show that this pressure is a measurable quantity and propose an experimental procedure for its measurement.

Nonuniversal finite-size scaling in anisotropic systems

We study the bulk and finite-size critical behavior of the O(n) symmetric phi4 theory with spatially anisotropic interactions of noncubic symmetry in d<4 dimensions. In such systems of a given (d,n) universality class, two-scale factor universality is absent in bulk correlation functions, and finite-size scaling functions including the Privman-Fisher scaling form of the free energy, the Binder cumulant ratio, and the Casimir amplitude are shown to be nonuniversal. In particular it is shown that, for anisotropic confined systems, isotropy cannot be restored by an anisotropic scale transformation.

Scaling and nonscaling finite-size effects in the Gaussian and the mean spherical model with free boundary conditions

We calculate finite-size effects of the Gaussian model in a Lx(d-1) box geometry with free boundary conditions in one direction and periodic boundary conditions in d-1 directions for 2<d<4. We also consider film geometry (L--> infinity ). Finite-size scaling is found to be valid for d<3 and d>3 but logarithmic deviations from finite-size scaling are found for the free energy and energy density at the Gaussian upper borderline dimension d*=3. The logarithms are related to the vanishing critical exponent 1-alpha-nu=(d-3)/2 of the Gaussian surface energy density. The latter has a cusplike singularity in d>3 dimensions. We show that these properties are the origin of nonscaling finite-size effects in the mean spherical model with free boundary conditions in d > or =3 dimensions. At bulk T(c), in d=3 dimensions we find an unexpected nonlogarithmic violation of finite-size scaling for the susceptibility chi approximately L3 of the mean spherical model in film geometry, whereas only a logarithmic deviation chi approximately L2 ln L exists for box geometry. The result for film geometry is explained by the existence of the lower borderline dimension d(l)=3, as implied by the Mermin-Wagner theorem, that coincides with the Gaussian upper borderline dimension d*=3. For 3<d<4 we find a power-law violation of scaling chi approximately L(d-1) at bulk T(c) for box geometry and a nonscaling temperature dependence chi(surface) approximately xi(d) of the surface susceptibility above T(c). For 2<d<3 dimensions we show the validity of universal finite-size scaling for the susceptibility of the mean spherical model with free boundary conditions for both box and film geometry and calculate the corresponding universal scaling functions for T > or =T(c).

Nonuniversal size dependence of the free energy of confined systems near criticality

The singular part of the finite-size free-energy density f(s) of the O(n) symmetric phi(4) field theory is calculated for confined geometries of linear size L with periodic boundary conditions in the large-n limit and with Dirichlet boundary conditions in one-loop order. We find that both a sharp cutoff and a subleading long-range interaction cause a leading nonuniversal L dependence of f(s) near T(c). This implies a significant restriction for the validity of universal finite-size scaling for model systems and real systems. For film geometry we predict a leading nonuniversal contribution to the critical Casimir force above the superfluid transition of (4)He.

Topical application of penciclovir cream for the treatment of herpes simplex facialis/labialis: a randomized, double-blind, multicentre, aciclovir-controlled trial

BACKGROUND

Herpes simplex facialis/labialis (HSFL) is a common infectious skin disorder, caused mainly by herpes simplex virus (HSV) type 1, for which the topical application of a cream containing an antiviral agent for treatment of the disease has been widely utilized.

OBJECTIVE

To explore the efficacy of the topical application of 1% penciclovir cream in the treatment of HSFL, and to compare its efficacy and safety with 3% aciclovir cream.

METHODS

A total of 248 patients with a diagnosis of HSFL were randomly allocated to one of the two treatment groups (n = 124 each), using stratified randomization based on a table of random numbers. Before treatment (day 0) and at every visit (days 3, 5 and 7) during the study, the sign and symptom scores were recorded by the same doctor.

RESULTS

Excluding 23 patients (10 in the penciclovir and 13 in the aciclovir groups), 225 completed the study, and no severe adverse events were noted with any of the treatment regimens. Results show that an encouraging improvement in the clinical course was found simultaneously for patients with each episode type and each treatment assignment. There were no significant differences in terms of efficacy endpoint, clinical cure rate, and safety between the two treatment arms, but there was a trend towards a shorter time to resolution of all symptoms, cessation of new blisters, and loss of crust (p <or= 0.08) in penciclovir-treated primary patients. In addition, the clinical scores in penciclovir-treated primary patients were significantly lower than those in the respective aciclovir-treated patients on treatment day 5 (p < 0.01) and day 7 (p < 0.05).

CONCLUSION

Topical 1% penciclovir cream is as convenient and as effective as 3% aciclovir cream for the treatment of HSFL. Penciclovir cream may provide a good topical alternative to other types of therapy in the future.

Epitope mapping using the X-ray crystallographic structure of complement receptor type 2 (CR2)/CD21: identification of a highly inhibitory monoclonal antibody that directly recognizes the CR2-C3d interface

Complement receptor type 2 (CR2)/CD21 is a B lymphocyte cell membrane C3d/iC3b receptor that plays a central role in the immune response. Human CR2 is also the receptor for the EBV viral membrane glycoprotein gp350/220. Both C3d and gp350/220 bind CR2 within the first two of 15-16 repetitive domains that have been designated short consensus/complement repeats. Many mAbs react with human CR2; however, only one currently available mAb is known to block both C3d/iC3b and gp350/220 binding. We have used a recombinant form of human CR2 containing the short consensus/complement repeat 1-2 ligand-binding fragment to immunize Cr2(-/-) mice. Following fusion, we identified and further characterized four new anti-CR2 mAbs that recognize this fragment. Three of these inhibited binding of CR2 to C3d and gp350/220 in different forms. We have determined the relative inhibitory ability of the four mAbs to block ligand binding, and we have used overlapping peptide-based approaches to identify linear epitopes recognized by the inhibitory mAbs. Placement of these epitopes on the recently solved crystal structure of the CR2-C3d complex reveals that each inhibitory mAb recognizes a site either within or adjacent to the CR2-C3d contact site. One new mAb, designated 171, blocks CR2 receptor-ligand interactions with the greatest efficiency and recognizes a portion of the C3d contact site on CR2. Thus, we have created an anti-human CR2 mAb that blocks the C3d ligand by direct contact with its interaction site, and we have provided confirmatory evidence that the C3d binding site seen in its crystal structure exists in solution.

Studies on mode of detection of leprosy in China during the years 1981-1998

Along with the nationwide economic reform initiated in the early 1980s and the rapid decrease of leprosy endemic after the implementation of multi-drug therapy (MDT), the leprosy programme changed from 'vertical' to 'horizontal'. An evolution in the mode of detection of leprosy cases has consequently taken place. Based on the nationwide registration of newly detected cases, the profile of patients at detection has been studied. The proportions of cases corrected significantly with calendar years in detection by dermatological clinics, contact checks, 'clue survey' and mass survey, showing a significant increase in percentage of cases detected through dermatological clinics and contact checks, and decreases through 'clue survey' and mass survey. Detection of cases through dermatological clinics and voluntary reporting have become the main modes of case-finding during 1997-1998, accounting for 37.3% and 28.6%, respectively, where contact check accounts for only 9.1%. In areas with good dermatological services, a significantly higher proportion (75.9%) of cases was detected through dermatological clinics, where voluntary reporting and 'clue survey' were the main modes of detection in endemic areas. As regards confirmation of diagnosis, the great majority of cases were confirmed by leprosy units, even though they were detected in various other situations. Only 6.5% of leprosy cases were detected and subsequently confirmed by doctors in dermatologic clinics. The present modes of detection and their relation to demographical, epidemiological, clinical factors and health services are discussed. This study emphasizes the cardinal importance of the dermatological clinics in the detection of leprosy cases in China at the present time and hence the need to strengthen the training of doctors in these clinics, while continuously encourage their involvement in leprosy control.

Evaluation of diagnostic criteria for atopic dermatitis: validity of the criteria of Williams et al. in a hospital-based setting

BACKGROUND

Surveys of the prevalence of atopic dermatitis (AD) have been carried out world-wide, but the results vary widely. The differences probably result from the use of different diagnostic criteria. Williams et al. proposed minimum, simplified, diagnostic criteria that require no invasive test and are easy to use. Pilot studies in European countries showed their suitability for implementation both in hospitals and in the community, and their high sensitivity and specificity.

OBJECTIVES

To evaluate the potential practical value of the criteria of Williams et al. in the Chinese population.

METHODS

The criteria of Hanifin and Rajka (gold standard), Williams et al. and Kang and Tian were applied and compared in 111 patients with AD and 121 control subjects with other skin diseases in three out-patient centres in China.

RESULTS

The criteria of Williams et al. showed a similar diagnostic efficiency to that of the gold standard, with the sensitivity, specificity and kappa value reaching 95.50%, 97.52% and 0.93, respectively. No significant difference was found between the criteria of Williams et al. and those of Kang and Tian (chi2 = 0.69, P > 0.05). 'Onset under the age of 2 years', a criterion of Williams et al. could be used in subjects of any age.

CONCLUSIONS

The diagnostic efficiency of the criteria of Williams et al. was basically similar to those of Hanifin and Rajka and of Kang and Tian in our out-patient settings. However, those of Williams et al. were easier to apply and required no invasive tests.

[Role of STAT1 on the regulation the human hsp90 alpha gene expression]

OBJECTIVE

To investigate the role of STAT1 on the regulation of human hsp90 alpha gene expression.

METHODS

We first transfected Jurkat cells with the STAT1 expression construct and analyzed the expression of hsp90 alpha gene expression via quantitative RT-PCR system. Then we co-transfected the STAT1 expression construct and the CAT reporter gene driven by different length of 5' flanking sequence of hsp90 alpha gene. Western blot was carried out to detect the level of tyrosine phosphorylation in Jurkat cells with and without heat shock treatment (42 degrees C 1 h). By electrophoretic mobility shift assays (EMSA), we evaluated the DNA binding activity of a STAT1 responsible element located in the regulatory region of hsp90 alpha gene in Jurkat cell nuclear extracts.

RESULTS

The mRNA level of hsp90 alpha gene in Jurkat cells was decreased when transfected by STAT1 expression construct, over-expression of STAT1 down-regulates the expression of CAT reporter gene with the present of a distal fragment from -1756 to -1463 within the 5' flanking regulatory sequences of hsp90 alpha gene. The tyrosine phosphorylation of STAT1 was detectable in Jurkat cells and increased when subjected to heat shock. Electrophoretic mobility shift assays (EMSA) results showed that STAT1 could bind to its responsible element in the regulatory region of hsp90 alpha gene.

CONCLUSION

STAT1 could negatively regulate the human hsp90 alpha gene expression.

Strange quark polarization of the nucleon: a parameter-independent prediction of the chiral potential model

We perform a one-loop calculation of the strange quark polarization (Deltas) of the nucleon in an SU(3) chiral potential model. We find that if the intermediate quark excited states are summed over in a proper way, i.e., summed up to a given energy instead of given radial and orbital quantum numbers, Deltas turns out to be almost independent of all the model parameters: quark masses and potential strengths. The contribution from the quark-antiquark pair creation and annihilation " Z" diagrams is found to be significant. Our numerical results agree quite reasonably with experiments and lattice QCD calculations.