[Effect analysis on endoscopic transnasal resection of epidural cholesteatoma at paracentral skull base].

Objective: To indicate the clinical features of endoscopic transnasal resection of epidural cholesteatoma at paracentral skull base and to analyze its efficacy. Methods: The total excision rate, postoperative complications and postoperative curative effect of 7 patients (4 males and 3 females, aging from 32 to 63 years old) who underwent middle skull base surgery for epidural cholesteatoma resection under transnasal endoscope at Tianjin Huanhu Hospital between August 2017 and August 2020 were retrospectively reviewed. All patients were followed up for 6 to 36 months. The postoperative MRI, clinical symptoms and recurrence were reviewed. Descriptive statistical methods were used for analysis. Results: Among the 7 patients, there were total resection (complete resection of cyst contents and capsule) in 4 patients, near-total resection (complete resection of cyst contents, incomplete resection of cyst capsule) in 1 patient, and subtotal resection (incomplete resection of cyst contents and capsule) in 2 patients. The clinical symptoms of all patients were improved postoperatively with 1 patient who had no clinical symptoms. One case had postoperative cerebrospinal fluid rhinorrhea, which was cured after lumbar drainage and nasal iodoform gauge packing. Up to now, 7 patients (including patients with partial resection) had no recurrence. Conclusion: Endoscopic transnasal approaches may be effectively used for resection of epidural cholesteatoma in the paracentral skull base in carefully selected cases.

[Surgical treatment of Stanford type A aortic dissection after thoracic endovascular aortic repair].

Objective: To examine the surgical treatment of Stanford type A aortic dissection (type A dissection) after thoracic endovascular aortic repair (TEVAR). Methods: The data of 58 patients with reoccurrence of type A dissection after TEVAR admitted into the Department of Cardiovascular Surgery, Henan Chest Hospital from February 2012 to January 2020 were analyzed retrospectively. There were 40 males and 18 females, aged (57.0±6.7) years (range: 31 to 71 years). The time between recurrence of type A dissection and TEVAR (M(QR)) was 37 days (72.8 months) (range: 1 h to 14 years). Forty-eight cases underwent emergency operation, 9 cases underwent sub-emergency operation, and 1 case died of dissection rupture on the way to the operating room. All 57 patients underwent radical treatment. Fifty-four cases underwent the frozen elephant trunk technique under deep hypothermia circulatory arrest and selective cerebral perfusion, and 3 cases (>65 years old) underwent arch debranch anastomosis+ascending aorta replacement+descending arch covered stent implantation under mild hypothermia. Results: The operation time was (445±32) minutes (range: 382 to 485 minutes), the aortic crossclamp time was (103±19) minutes (range: 89 to 133 minutes), the cardiopulmonary bypass time was (189±27) minutes (range: 162 to 221 minutes), and the intraoperative blood loss was (665±343) ml (range: 450 to 1 750 ml). Postoperative ICU stay time was 5 (6) days (range: 2 to 27 days), and postoperative hospital stay was 14.0 (4.5) days (range: 2 to 36 days). Three cases died, including 2 cases with severe brain complications and 1 case with systemic multiple organ failure caused by severe liver insufficiency and gastrointestinal hemorrhage. Postoperative follow-up was 0.5 to 7.0 years, which showed that 1 case had left coronary artery anastomotic stoma fistula 3 months after operation and underwent reoperation, 2 cases underwent thoracoabdominal aortic replacement again, and the rest of patients had no anastomotic stoma fistula and incomplete stent distortion and expansion on CT angiography. Four cases died during follow-up, and 1 case died of sudden cerebral infarction 2 years after operation. Conclusion: The recurrent type A dissection after TEVAR is mostly related to stent graft, and the patients can undergo operation actively with good prognosis.

[Analysis on endoscopic endonasal approach combined with the frontotemporal orbitozygomatic approach under the microscope for skull base tumor with intra and extra-cranial involvement].

Objective: To evaluate the application of combination use of endoscopic endonasal approach combined with the frontotemporal orbitozygomatic approach microscopically in skull base tumor with intra and extra-cranial involvement. Methods: A total of 7 patients (4 males and 3 females, aging from 27 to 65 years old, with a medium age of 48) undergone complicated skull base surgeries via endoscopic endonasal approach combined with the frontotemporal orbitozygomatic approach microscopically from May 2016 to January 2018 were reviewed respectively. The patients included 2 cases of recurrent invasive pituitary adenoma, 3 cases of basal skull meningiomas, 1 case of clivus chondrosarcoma, and 1 case of recurrent nasopharyngeal carcinoma. The lesion extensively infiltrated nasal cavity, extending to the paranasal sinus, bilateral cavernous sinus, sellar region, suprasellar, superior clivus, temporal lobe, pterygopalatine fossa, infratemporal fossa and important intracranial vessels. All the 7 patients were treated under general anesthesia by endoscopic endonasal approach combined with frontotemporal orbitozygomatic approach under the microscope. Total excision rate, intraoperative and postoperative complications and postoperative curative effect were observed. All of them were followed up for 6 to 12 months. The Glasgow Outcome Scale (GOS) was used to evaluate the prognosis. Result: Total tumor removal was performed in 5 cases, subtotal removel in 2 cases. There was no complication during the operation. Postoperative severe complications occurred in 2 cases, including 1 case of cerebrospinal fluid rhinorrhea and intracranial infection, which was cured by lumbar cistern drainage and intrathecal injection; 1 case occurred oculomotor nerve paralysis, which recovered during follow-up. Postoperative complications occurred in 1 case of trochlear nerve dysfunction, 2 cases of facial numbness, and 1 case of tinnitus. During follow-up, all patients recovered to varying degrees. There was no bleeding and death after the operation. No tumor recurred during the follow-up period. All patients were recovered well with GOS grade Ⅳ-Ⅴ. Conclusions: Endoscopic transnasal approach combined with microscopic frontotemporal orbitozygomatic approach can remove tumors in one stage, reduce surgical complications and improve surgical effect. It has good application prospects and is suitable for excising complex intracranial and extracranial communicating tumors of widely involving sellar, clivus and petrous apex area.

Long noncoding RNA SNHG14 exerts oncogenic functions in lung adenocarcinoma through acting as a sponge to miR-613.

Since this article has been suspected of research misconduct and the corresponding authors did not respond to our request to prove originality of data and figures, "Long noncoding RNA SNHG14 exerts oncogenic functions in lung adenocarcinoma through acting as a sponge to miR-613, by Z.-N. Xu, Z.-X. Wang, L. Xu, H.-X. Yu, K. Chao, L.-L. Yang, X.-L. Han, H.-B. Sun, published in Eur Rev Med Pharmacol Sci 2019; 23 (24): 10810-10817-DOI: 10.26355/eurrev_201912_19784-PMID: 31858549" has been withdrawn. The Publisher apologizes for any inconvenience this may cause. https://www.europeanreview.org/article/19784.

Long noncoding RNA SNHG14 exerts oncogenic functions in lung adenocarcinoma through acting as a sponge to miR-613.

OBJECTIVE: Lung adenocarcinoma is one of the most ordinary malignant tumors. Recent researches have proved that long noncoding RNAs (lncRNAs) are vital factors in many diseases. In this work, lncRNA SNHG14 was studied to identify its function in the development of lung adenocarcinoma. PATIENTS AND METHODS: Real Time-quantitative Polymerase Chain Reaction (RT-qPCR) was utilized to detect SNHG14 expression in paired lung adenocarcinoma patients' tissue samples and cells. Then, the function of SNHG14 was detected through MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay, colony formation assay, and transwell assay in vitro. Besides, mechanism assays and the interaction between SNHG14 and miR-613 were conducted. RESULTS: SNHG14 was remarkably higher-expressed in lung adenocarcinoma tissues than in adjacent samples. Moreover, cell proliferation and invasion of lung adenocarcinoma were promoted via overexpression of SNHG14, while cell proliferation and invasion of lung adenocarcinoma were inhibited via silence of SNHG14. Moreover, RT-qPCR results revealed that miR-613 was downregulated via overexpression of SNHG14, while miR-613 was upregulated via knockdown of SNHG14. Further experiments showed that miR-613 was also a direct target of SNHG14 in lung adenocarcinoma. CONCLUSIONS: Our study suggests that SNHG14 enhances lung adenocarcinoma cell proliferation and invasion via targeting miR-613, which indicates that SNHG14 may be a potential therapeutic target in lung adenocarcinoma.

[Clinical analysis of brain abscess after endoscopic repairment of cerebrospinal fluid rhinorrhea].

Objective: To explore the clinical characteristics of the complication of brain abscesses after cerebrospinal fluid rhinorrhea repairment. Methods: A retrospective analysis was conducted on 149 patients undergone endoscopic repairment of cerebrospinal fluid rhinorrhea from October 2007 to October 2017 in Department of Otorhinolaryngology Head and Neck Surgery, Tianjin HuanHu Hospital. The clinical characteristics and treating methods of 3 brain abscess cases were analyzed. Results: Of the 149 patients accepted the endoscopic repairment of cerebrospinal fluid rhinorrhea, 3 cases were complicated with postoperative brain abscesses, which showed as frontal lobe abscess by strengthened head MRI. The incidence of abscess was 2.0%. Abscess formation time was within 10 d after surgery. One case was treated with antibiotic and reducing intracranial pressure, while other 2 cases were treated with puncture drainage. After following-up of 1 to 24 months, these 3 cases had no recurrence of cerebrospinal fluid rhinorrhea or abscess. Conclusions: The complication of brain abscess formation after endoscopic repairment of cerebrospinal fluid rhinorrhea is more common in frontal lobe, which may take place within 7-10 d postoperatively. Conservative treatment is the first choice. Under the condition of obvious symptoms and pus cavity fusion, puncture drainage can be performed.

MiR-608 exerts tumor suppressive function in lung adenocarcinoma by directly targeting MIF.

OBJECTIVE: Lung adenocarcinoma (LA) is considered as a highly aggressive disease with heterogeneous prognosis. The molecular mechanisms of LA progression remain elusive. Recent studies have shown that dysregulation of microRNAs (miRNAs) is prevalent in LA, playing a significant role in tumor progression. The present work aims to analyze the expression and function of miR-608 in LA. PATIENTS AND METHODS: Quantitative Real-time polymerase chain reaction (qRT­PCR) assay and Western blot were performed to detect expressions of miR-608 and migration inhibitory factor (MIF). Luciferase reporter assays were carried out to investigate the regulatory effect of miR-608 on MIF. The cell invasion and the migration capabilities were detected by transwell assay. RESULTS: QRT-PCR indicated that miR-608 expressions in LA tissues were markedly reduced than that of the normal tissues. Moreover, the expression of MIF, a potential target gene of miR-608, was inversely associated with miR-608 expression in LA. Furthermore, miR-608 overexpression could inhibit LA invasion and migration, which was reversed by MIF knockdown. CONCLUSIONS: Our study revealed the mechanisms that miR-608 suppressed LA invasion and migration by targeting MIF, suggesting that miR-608/MIF axis could be used as a potential prognostic biomarker and therapeutic target for LA.

[The fMRI research of vestibular migraine neural pathways].

Objective:To investigate the abnormal functional response of neural pathways of vestibular migraine (VM) patients, located the functional area, and inferred the possible mechanism. Method:Twenty patients of VM, 20 of migraine without aura (MwoA), and 20 of healthy controls (HC), underwent whole-brain blood oxygen level-dependent (BOLD) fMRI during ear irrigation with cold water. We chose the stimulation image and the diapause stimulation image. Analyses explored functional area with BOLD signal change of the three groups. Result:We observed task-positive BOLD signal change in cortical and subcortical pattern in response to ear irrigation of all participants. Such as parietal lobe, temporal lobe, insular lobe, cingulate gyrus, thalamus, caudate nucleus, optic radiation, precuneus. VM patients showed a significantly task-negative in thalamic and fusiform gyrus in comparison with the other groups (P<0.05). Conclusion:fMRI could response the respective functional area objectively. We inferred the possible mechanism of VM was abnormal activation of thalamus and fusiform gyrus, produced crossing between the vestibular sensory pathway conduction and the pain conduction.

Development of SCAR Markers and an SYBR Green Assay to Detect Puccinia striiformis f. sp. tritici in Infected Wheat Leaves.

Stripe rust, caused by the pathogenic fungus Puccinia striiformis f. sp. tritici, is an important disease of wheat worldwide. A rapid and reliable detection of the pathogen in latent infected wheat leaves is useful for accurate and early forecast of outbreaks and timely application of fungicides for managing the disease. Using the previously reported primer pair Bt2a/Bt2b, a 362-bp amplicon was obtained from P. striiformis f. sp. tritici and a 486-bp amplicon was obtained from both P. triticina (the leaf rust pathogen) and P. graminis f. sp. tritici (the stem rust pathogen). Based on the sequence of the 362-bp fragment, two pairs of sequence characterized amplified region (SCAR) primers were designed. PSTF117/PSTR363 produced a 274-bp amplicon and TF114/TR323 produced a 180-bp amplicon from P. striiformis f. sp. tritici, whereas they did not produce any amplicon from P. triticina, P. graminis f. sp. tritici, or any other wheat-infecting fungi. The detection limit of PSTF117/PSTR363 was 1 pg/µl and TF114/TR323 was 100 fg/µl. Both SCAR markers could be detected in wheat leaves 9 h post inoculation. An SYBR Green RT-PCR method was also developed to detect P. striiformis f. sp. tritici in infected leaves with the detection limit of 1.0 fg DNA from asymptomatic leaf samples of 6 h after inoculation. These methods should be useful for rapid diagnosis and accurate detection of P. striiformis f. sp. tritici in infected wheat leaves for timely control of the disease.

[Prognosis analysis of multidisciplinary treatment on nasal mucosa malignant melanoma].

Objective:The aim of this study is to investigate the facters affecting prognosis of primary sinonasal mucosal malignant melanoma and analyze the optimal therapeutic strategies.Method:Among the 33 patients with sinonasal mucosal malignant melanoma,twenty-six patients received surgical treatment,nineteen patients accepted radiotherapy,and twenty-one patients had the biotherapy.The Kaplan-Meier and log-rank methods was used to assess the prognosis of different treatment.Result:the patient's 3-year-survival rate was 48.3% and 5-year-survival rate was 30.3%.Surgical treatment is the important factor for the 5-year-survival rate(P <0.05),while the chemotherapy and biotherapy had no effect on overall survival rate(P>0.05).Conclusion:The surgical treatment is the preferred method of treatment,and endoscopic surgery has the satisfactory effect.Adjuvant radiotherapy can improve local tumor control rates.Immunotherapy is the development direction of treatment for nasal mucosal malignant melanoma.

Endovascular revascularization for carotid artery occlusion in patients with Takayasu arteritis.

OBJECTIVES: Type I Takayasu arteritis is a progressive inflammatory disease involving the aortic arch and its main branches. If untreated, patients may develop a variety of serious conditions ranging from hemiplegia to death. Whilst there is a relatively strong evidence base for the outcome of surgical techniques, few reports have focused on revascularization using an endovascular technique in patients with Takayasu arteritis. METHODS: From May 2007 to March 2013, 11 consecutive patients with Takayasu arteritis presenting with severe cerebral ischemia symptoms caused by occlusive lesion in carotid artery underwent elective revascularization, 10 on the left carotid artery and 1 on the right. All patients received immunosuppressive treatment pre-and post-operation. Contraindications to open surgery included: ESR >40 mm/h; ipsilateral cerebral infarction of <2 weeks duration and sufficient poor health whereby the patient cannot tolerate general anesthesia. Quality of life was analyzed using the EQ-5D questionnaire before and after surgery. RESULTS: Patients were followed for a mean of 31.6±27.4 months. Seven cases of total occlusion and 2 cases of severe stenosis were recanalized successfully and experienced clinical remission. Recanalization failed in 2 patients, both of whom had occlusion of a long segment of the artery. Initial endovascularization comprised small diameter, low pressure dilatation only to allow time for the reopened arteries to respond. If clinically indicated, repeat angioplasty with a larger diameter balloon was performed 1-3 months later. Major complications occurred in 2 patients. Eight of the recanalized carotid arteries were patent at the end of follow-up and patients had satisfactory quality of life CONCLUSIONS: In patients with Takayasu arteritis, carotid artery recanalization via endovascular surgery combined with immunosuppressive therapy is effective and can be performed safely and repeatedly. The improvement in carotid artery blood flow supplying the central nervous system relieves symptoms of cerebral ischemia and is associated with an improved quality of life.

CXCR7 stimulates MAPK signaling to regulate hepatocellular carcinoma progression.

The CXCL12/CXCR4 axis has been posited widely to have significant roles in many primary tumors and metastases. It is known that CXCR7 can also be engaged by CXCL12, but the exact function of CXCR7 is controversial. This prompted us to investigate the expression, specific function and signal transduction of CXCR7 in hepatocellular carcinoma (HCC). In this study, CXCR7 and CXCR4 were differentially expressed in nine cell lines of HCC, and that elevated expression of both CXCR7 and CXCL4 were correlated with highly metastatic ability of HCC cells. Moreover, CXCR7 expression was significantly upregulated in metastatic HCC samples compared with the non-metastatic ones by staining of high-density tissue microarrays constructed from a cohort of 48 human HCC specimens. CXCR7 overexpression enhanced cell growth and invasiveness in vitro, and tumorigenicity and lung metastasis in vivo. By contrast, CXCR7 stable knockdown markedly reduced these malignant behaviors. In addition, it was observed that alterations in CXCR7 expression were positively correlated with the phosphorylation levels of mitogen-activated protein kinase (MAPK) pathway proteins. Targeting extracellular regulated kinase pathway by using U0126 inhibitor or using CCX771, a selective CXCR7 antagonist, drastically reduced CXCR7-mediated cell proliferation. Importantly, by using human biotin-based antibody arrays, several differentially expressed proteins were identified in CXCR7-overexpression and depletion groups. Comparative analysis indicated that upstream regulators including TP53 and IL-6 were involved in CXCR7 signal transduction. CXCR7 expression was further proved to regulate expression of vascular endothelial growth factor A and galectin-3, which may contribute to tumor angiogenesis and invasiveness. Consequently, elevated expression of CXCR7 contributes to HCC growth and invasiveness via activation of MAPK and angiogenesis signaling pathways. Targeting CXCR7 may prevent metastasis and provide a potential therapeutic strategy for HCC.

Leucine markedly regulates pancreatic exocrine secretion in goats.

Four goats (30.1 ± 1.3 kg) with common bile duct re-entrant catheter and duodenal catheter were used to evaluate the effects of duodenal leucine infusion on pancreatic exocrine secretion and plasma parameters with two 4 × 4 Latin square design experiments. In the long-term infusion experiment, goats were fed twice daily [700 g/day, dry matter (DM) basis] at 8:00 and 18:00 hours and were duodenally infused with 0, 3, 6, 9 g/day leucine for 14 days. Pancreatic juice and jugular blood samples were collected over 1-h intervals for 6 h daily from d 11 to 14 days to encompass a 24-h day. In the short-term experiment, goats were infused leucine for 10 h continuously at the same infusion rate with Experiment 1 after feed deprivation for 24 h repeated every 10 days. Pancreatic juice and blood samples were collected at 0, 1, 2, 4, 6, 8 and 10 h of infusion. The results showed that the long-term leucine infusion did not affect pancreatic juice secretion, protein output, trypsin and lipase secretion and plasma insulin concentration, but linearly increased α-amylase secretion. No changes in pancreatic protein and lipase secretion were observed in the short-term infusion. Pancreatic juice and α-amylase secretion responded quadratically, with the greatest values observed in the 3 and 6 g/day leucine respectively. Trypsin secretion linearly decreased, while plasma insulin concentration increased linearly with increased leucine infusion. The results demonstrated that duodenal leucine infusion dose and time dependently regulated pancreatic enzyme secretion not associated with the change in plasma insulin concentration.

Exploring the binding features of polybrominated diphenyl ethers as estrogen receptor antagonists: docking studies.

The polybrominated diphenyl ethers (PBDEs) accumulating in nature are known to be endocrine-disrupting compounds. Of first concern are those interacting with and altering activity of the human estrogen receptor alpha (hERalpha). In this study a docking study was carried out to explore the binding modes of PBDE compounds as hERalpha antagonists. It was found that some of the PBDE compounds with antiestrogenic activity extended into the channel of the estrogen receptor (ER), which is usually occupied by the alkylamine side chain of the ER antagonists raloxifene (RAL) and 4-hydroxytamoxifen (OHT), while most PBDE compounds without antiestrogenic activity adopted binding modes similar to that of ER agonist 17beta-estradiol (E2), located in the binding cavity and which did not protrude into the channel. The present study suggests that pose comparison based on docking is useful for discriminating whether or not PBDE compounds have antiestrogenic activity. Knowing the binding modes of compounds in hERalpha can help to screen out antiestrogenic compounds and further develop descriptive and predictive models in ecotoxicology.

Three-dimensional quantitative structure activity relationship (3D-QSAR) analysis for in vitro toxicity of chlorophenols to HepG2 cells.

In the present paper, comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA) were applied to investigate two 3D-QSAR models for the cytotoxicity of chlorophenols. These models have evaluated the intensity of chlorophenols' toxicity on HepG2 cells in vitro. The CoMFA model has both high consistency and predictability. The contribution of the electrostatic field to biological activity is greater than that of the steric field. The CoMSIA model used in this study includes two fields, one is hydrophobic field, and the other is electrostatic field. The relative contribution of them is 0.789:0.211. Consisted with the CoMFA model, the CoMSIA electrostatic filed also plays a dominant role. The CoMFA and CoMSIA contour maps significantly elucidated that the electrostatic field is more important than the other fields and might be one of the reasons resulting in potential reactive mechanism involved in cell proliferation inhibition.

A11 Tetramer-assisted characterization of Rta-specific CD8+ T-cell responses in healthy virus carriers.

HLA Class I-restricted CD8(+) T-cell responses are believed to play an important role in controlling Epstein-Barr virus (EBV) infection, which has been consistently associated with nasopharyngeal carcinoma (NPC). Immediate early transactivator Rta of EBV has been shown to be associated with the reactivation of EBV from latency and drive the lytic cascade of EBV and comprise an important target for EBV-specific cellular cytotoxicity. Furthermore, BRLF1 is specifically expressed in NPC tumor cells. The protein product of BRLF1, Rta, could then be considered as a NPC tumor antigen. Therefore, cellular immunity against Rta represents a very important part of the immunity against NPC, as they should prevent the replication of EBV. In the present study, Rta-specific CD8(+) T-cell responses in healthy virus carriers were characterized by using A1101 tetramer containing the known Rta epitope ATIGTAMYK (134-142). We clearly showed A1101/ATIGTAMYK tetramer-reactive CD8(+) T cells in the circulation of healthy virus carriers, ranging from 2.13 to 9.03%. We then studied the expression of perforin and interferon-gamma (IFN-gamma) secretion in these Rta-specific T cells. Our study demonstrated that Rta-specific T cells are capable of IFN-gamma production and nearly 90% of the Rta-specific CD8(+) T cells expressed perforin. Presumably, these are the cells that play an important role in determining the initiation of the lytic cycle or the clearance of EBV.

Associations of HLA microsatellites with rheumatoid arthritis in Singaporean Chinese.

Rheumatoid arthritis in Singaporean Chinese has previously been shown to be associated with the DRB1*0405, DRB1*1001 haplotypes and to the DRB1*0901 haplotype when the former two were removed. The present paper focused on eight HLA associated microsatellite markers (TNFa, TNFd, D6S273, TAP1CA, DQCAR, DQCARII, D6S2222, D6S2223) and their allelic associations with Chinese RA. 60 RA patients and 75 healthy controls were studied. It appeared that DQCARII*194/DRB1*0405/TNFa*117 was part of the extended haplotype predisposed to RA, whereas DRB1*0901/D6S273*128 contributed to susceptibility to RA to a lesser degree in Singaporean Chinese. Additionally, a negative association with DQCAR*186/DRB1*0301/D6S273*122/TNFd*124 was observed. No association with disease development was observed in this study.

Development of quantitative structure activity relationships in toxicity prediction of complex mixtures.

AIM: To predict the toxicity of mixtures of halogenated benzenes (narcotics). METHODS: Acute toxicity test of single chemicals and mixtures was performed using Photobacterium phosphoreum. Partition coefficients of mixtures were calculated by a special equation. Quantitative structure-activity relationship (QSAR) studies were carried out based on results of toxicity tests, n-octanol/water partition coefficient (Kow), and partition coefficient of mixtures (Kmix). RESULTS: 1) There was a good relationship between toxicity and lgKow for single compounds. 2) QSAR analysis showed a perfect correlation between the calculated Kmix and the mixture toxicity for binary mixtures. 3) Using the QSAR model of binary mixtures, the toxicity of other related mixtures containing different composition and fraction was predicted very well. CONCLUSION: The toxicity of halogenated benzene mixtures (narcotics) was predicted by QSAR. This kind of study is helpful for assessing the toxicity of narcotic mixtures.

[Isolation and cytological identification of a desynaptic variant in rice].

A sterile variant was found from the population of a japonica rice variety Lunhui 422. Cytological investigation was conducted in meiosis. It is showed that the sterility was caused by desynapsis. As there were 8.69 bivalents in average occurred to be desynaptic, moreover, the most number of the desynaptic bivalents reached 12 at post diakinsis. It can be considered that the desynaptic variation is a complete desynapsis found in rice so far.