Microplastics pollution in the Yellow River basin: current status and control strategy / 生物工程学报

Microplastics pollution has attracted worldwide attention. Compared with the status quo of microplastics pollution in marine environment and other major rivers and lakes, the relevant data of the Yellow River basin is relatively inadequate. The abundance, types, and spatial distribution characteristics of microplastic pollution in the sediments and surface water of the Yellow River basin were reviewed. Meanwhile, the status of microplastic pollution in the national central city and Yellow River Delta wetland was discussed, and the corresponding prevention and control measures were put forward. The results showed that the spatial distribution of microplastics pollution in sediments and surface water of the Yellow River basin increased from upstream to downstream, especially in the Yellow River Delta wetland. There are obvious differences between the types of microplastics in sediment and surface water in the Yellow River basin, which is mainly related to the materials of microplastics. Compared with similar regions in China, the microplastics pollution levels in national key cities and national wetland parks in the Yellow River basin are in the medium to high degree, which should be taken seriously. Plastics exposure through various ways will cause serious impact on aquaculture and human health in the Yellow River beach area. To control microplastic pollution in the Yellow River basin, it is necessary to improve the relevant production standards, laws and regulations, and improve the capacity of biodegradable microplastics and the degradation capacity of plastic wastes.

Experience of diagnosis and treatment for 89 patients with Marjolin's ulcers in lower limbs / 中南大学学报(医学版)

To summarize the clinical features of Marjolin's ulcers in lower limbs and the diagnosis and treatment methods for it.
 Methods: The clinical data of 89 patients with lower limbs Marjolin's ulcers, who were treated in Xiangya Hospital, Central South University from Jan 1998 to Dec 2017, were retrospectively analyzed, including demographics, injury factors, length of cancer incubation period, lesion location, ulcer area, pathological type, bone invasion, lymph node metastasis, surgical methods, repair methods and prognosis.
 Results: There were 70 males and 19 females among 89 patients with lower limbs Marjolin's ulcers. The most common injuries were flame burn (42 cases), trauma (19 cases), and burns (12 cases). The lesions were most common in the lower leg (31 cases), followed by the thigh (11 cases) and the heel (11 cases). The ulcer area was 1.5-600.0 cm2. There were 80 cases of squamous cell carcinoma, 8 cases of verrucous carcinoma, and 1 case of sarcoma. Before operation, 78 cases of inguinal lymphadenectasis were found, 49 cases of inguinal lymph node dissection, 29 cases of simple lymph node biopsy and resection, and 9 cases of lymph node metastasis and 8 cases of bone invasion were observed; 24 cases of amputation, 53 cases of extended resection and skin grafts, and 12 patients of extensive resection and flap transplantation were performed. Sixty-five cases were followed up, and 8 cases recurred, including 2 cases of amputation patients and 6 cases of extended resection patients. There was no relationship between recurrence of tumors and surgical methods (P>0.05).
 Conclusion: The recurrence and metastasis rate of Marjolin's ulcers in lower limbs is high, requiring early detection, early diagnosis, early surgical treatment and regular follow-up. Lnguinal lymphadenectasis is more common and requires lymph node biopsy and lymphadenectomy, or lymph node dissection. Extended local resection, skin graft or flap repair is the main treatment methods. However, amputation can be considered if the cancer is big, the invasion is deep, and the lower extremity scar is extensive and combined with severe deformity.

The relation between the expression of P130Cas, PTEN and EMT of skin scar carcinoma / 中国医师杂志

Objective To study the relation between the expression of P130 Crk-associated substrate (P130Cas),phosphatase and tensin homolog (PTEN)and the epithelial-mesenchymal transition (EMT) of skin scar carcinoma.Methods Tissues of skin scar carcinoma,scar and normal skin were collected from 8 patients who were pathologically diagnosed as skin scar carcinoma with high differentiated squamous cell carcinoma.The expression of PTEN,P130Cas,E-cadherin and Vimentin in normal skin,skin scar and skin scar carcinoma tissues were detected by immunohistochemical method of S-P.Results The expression of PTEN,P130Cas and E-cadherin in normal skin,scar and skin scar carcinoma tissues were all significantly different (P ＜ 0.05).The expression of Vimentin in skin scar carcinoma tissues were significantly increased than that in normal skin and skin scar tissues,but there was no statistically significance difference between skin scar tissues and normal skin (P ＞ 0.05).The expression of PTEN in skin scar carcinoma tissues was negatively correlated with P130Cas (r =-0.78,P =0.023) and positively correlated with E-cadherin (r =0.83,P =0.011),but there were no correlation between PTEN and Vimentin (P ＞ 0.05);The expressions of P130Cas in skin scar carcinoma tissues was negatively correlated with Ecadherin (r =-0.74,P =0.035),but there were no statistically significant correlation between P130Cas and Vimentin (P＞0.05).Conclusions Both PTEN and P130Cas involved in the EMT process of skin scar carcinoma and may be an important mechanism in scar carcinogenesis.

Analysis of clinical characteristics of 187 patients with Marjolin's ulcers / 中华烧伤杂志

<p><b>OBJECTIVE</b>To analyze the etiology and clinical characteristics of Marjolin's ulcer, and to explore its prevention and treatment.</p><p><b>METHODS</b>Medical records of 187 patients with Marjolin's ulcers admitted to the Department of Burns and Reconstructive Surgery of Xiangya Hospital of Central South University from January 1998 to May 2015 were retrospectively analyzed, including gender, age of onset of initial injury or primary disease, age of onset of Marjolin's ulcer, initial injury or primary disease, length of latency, lengths of pre- and post-ulceration periods, lesion site, lesion type, lesion area, local scar tension, histopathological type, degree of carcinoma cell differentiation, bone invasion and lymphadenopathy, treatment, and prognosis. The relationships between the age of onset of initial injury or primary disease and the length of latency, and the length of pre-ulceration period and the length of post-ulceration period were assessed by Spearman correlation analysis. The recurrence rates were processed with Fisher's exact test.</p><p><b>RESULTS</b>(1) Among the patients, the ratio of male to female was nearly 1.6:1.0. The age of onset of initial injury or primary disease was 0.17-78.00 (17±18) years, and the age of onset of Marjolin's ulcers was 18-84 (49±14) years. (2) The most common initial injury among the patients was flame burn. The length of latency was 0.25-74.00 (32±16) years, and the lengths of pre- and post-ulceration periods were 0-73.00 (26±19) years and 0.08-59.00 (6±11) years respectively. The common lesion sites were the lower limbs and head and face. The rodent ulcer was the most common lesion type, and the lesion area was 1-625 (69±110) cm(2). There were obviously negative correlations between the age of onset of initial injury or primary disease and the length of latency, as well as the length of pre-ulceration period and the length of post-ulceration period (with r values respectively -0.71 and -0.50, P values below 0.01). The pathological scars of strong tension around lesions were seen in 176 cases. (3) The major histopathological type was squamous cell carcinoma, with high cell differentiation in most cases. (4) Bone invasion of carcinoma cells was observed in 59 cases. Lymph node enlargement was observed in 100 cases, and lymph node metastasis was observed in 18 cases. (5) Twenty patients did not receive any surgery, while 167 patients were treated by surgery with lesion extended resection as the main method. According to the condition of wound after the lesion extended resection, the wounds were mainly repaired by skin grafting and transplantation of local skin flap. The majority of wounds in 139 patients who underwent lesion extended resection were repaired in one surgery. Twenty-eight patients out of 104 followed-up cases had recurrence after surgery, mainly seen on head and face, upper limb, lower limb, and buttock, and there was no significant difference among them (P>0.05). The recurrence time of most patients was longer than 6 months after cure.</p><p><b>CONCLUSIONS</b>Patients with Marjolin's ulcers in younger age of onset of initial injury or primary disease tend to have longer latency, during which the shorter the pre-ulceration period is, the longer the post-ulceration period will be. Marjolin's ulcers are prone to occur in scar sites with large tension. Early treatment of high tension scar and scar ulcer is important in prevention, and surgery is the optimal treatment for Marjolin's ulcers. Regular follow-up should be carried out owning to recurrence rate in certain degree after surgery.</p>

Influence of humidification or non-humidification on oxygen humidity during low-mid volume oxygen inhalation through nasal cannula / 中国实用护理杂志

Objective To discuss influence of the humidification or non-humidification on oxygen humidity during low-mid volume oxygen inhalation through nasal cannula.Methods A total of 160 patients with low-mid volume oxygen inhalation through nasal cannula for≥12 hours were randomly assigned to the humidified group and the un-humidified group with 80 patients in each.Recording the chases of oxygen humidity from the humidifying bottles.at the same time the indoor air humidity was also observed.Influence of the humidification or non-humidification on oxygen humidity during low-mid volume oxygen inhalation through nasal cannula was observed.Results There was not significant difference in oxygen humidity between the two groups.Conclusions Routine humidifying is not necessary in low-mid volume oxygen inhalation through nasal cannula.

Determination of kirenol in Herba Siegesbeckiae Preparata by high performance liquid chromatography / 中国中药杂志

<p><b>OBJECTIVE</b>To establish a high performance liquid chromatographic method for the determination of kirenol in Herba Siegesbeckiae Praeparata.</p><p><b>METHOD</b>The analysis was carried out on a Boston Crest ODS column (4.6 mm x 250 mm, 5 microm) with gradient elution using acetonitrile-water as mobile phases. The flow rate was 1.0 mL x min(-1) and the detection wavelength was at 215 nm.</p><p><b>RESULT</b>The calibration curve was linear over the range of 0.0202-20.02 microg for kirenol. The correlation coefficient of the calibration curve was 0.99975. The average recovery was 99.62% with relative standard derivation (RSD) of 2.0%.</p><p><b>CONCLUSION</b>The results showed that the method is simple, accurate and repeatable and it is suitable for the determination of kirenol in Herba Siegesbeckiae Praeparata.</p>

A comparison study on the respiratory symptoms between patients receiving low-to-mid flow humidified and dry oxygen by nasal cannula / 中华护理杂志

Objective To explore the effect of humidification of oxygen delivered by nasal cannula on the respiratory symptoms. Method A total of 540 patients receiving low-to-mid flow oxygen therapy (<4L/min) by nasal cannula for more than 12 hours were assigned to receive humidified (n=235) or dry (n=305)oxygen. While 226 patients receiving a low-to-mid flow oxygen therapy for more than 24 hours received humidified or dry oxygen respectively. The patients' respiratory symptoms were observed and recorded. Results Dryness over naso-pharyngeal region was the only symptom reported by patients in this study. There was no significant difference on the rate of dryness over naso-pharyngeal region between patients receiving humidified oxygen and patients receiving dry oxygen (P>0.05) either in the same patients when receiving dry and humidified oxygen (P>0.05). Conclusion Routine humidification is not necessary in low-to-mid flow oxygen therapy by nasal cannula.

Effect of DNA methyltransferase 5-aza-2'-deoxycytidine on proliferation of human esophageal squamous cancer cell line Eca109 in vitro / 中华检验医学杂志

Objective To explore the effect of the DNA methyltransferase 5-aza-2'-deoxycytidine (5-aza-CdR)on human esophageal squamous cancer Ecal09 cells.nethods Human esophageal squamous cell cancer(ESCC)Eca109 cells were treated by 5-aza-CdR with 10-7,10-6,1O-5,10-4,0 mol/L. Respectively.Consequently,the growth rate of the cells was detected by MTT assay and morphological structure Was observed.Meanwhile,cell apoptosis and cell cycle were analyzed by flow cytometry method. (FCM).ResulIs The proliferation of Eea109 cells Was inhibited by 5-aza-CdR from 10-7 to 10-4 mol/L Moreover,the inhibition rate showed time-and-concentration-dependent manner(24～96 h,F=160.06,P=0.000,10-7～10-4 mol/L,F:60.95,P:0.000).The maximum rate of inhibitory was reached up to(15.70±0.75)% in the group treated by 10-4 mol/L 5-aza-CdR after 96 hours.An apoptosis peak appeared before diploid peak.The proportion of Go/G1 phase cells Was significantly increased(F=6479.46, P=0.000),especially up to(89.70±0.91)% in the group treated by 10-4 mo/L 5-aza-CdR after 96 h. However,the proportion of S phase cells Was obviously decreased(F=4222.26,P=0.000),especially down to(9.10±0.48)% in the group treated bv 10-4mol/L 5-aza-CdR after 96 h.Conclusions The proliferation of Eca109 cells is inhibited bv 5-aza-CdR in a time-and-concentration-dependent manner.Moreover,the 5-aza-CdR can inhibit cell growth by regulation of DNA cycle and apoptosis.

Screening of target genes in esophageal squamous cell cancer in Kazakh by oligonucleotide microarray / 中华消化外科杂志

Objective To screen the differentially expressed genes in esophageal squamous cell cancer (ESCC) and normal tissue of esophageal mucosa in Kazakh. Methods RNA was extracted from the ESCC sections in Kazakh patients, and was amplified to obtain cRNA. The gene expression profiles in ESCC and normal tissue of esophageal mucosa were detected by HG-U133 Plus 2.0 gene chip. The results were analyzed by bioinfor-matics. Results One hundred and seventy differentially expressed genes in ESCC and normal tissue of esophageal mucosa were found, with a difference of more than 10 times in expression levels. Of the 170 genes, 39 were up-regulated (signal log ratio > 3 ) and 131 down-regulated (signal log ratio < - 3). These factors such as cell cycle regulation, apoptosis, cytoskeleton; extracellular matrix, intracellular signal transduction, protein translation and synthesis, and immunological functions were correlated with the genes with abnormal expression. Conclusion The use of oligonucleotide microarray accurately and efficiently screen the 170 target genes in ESCC in Kazakh. It is suggested that these genes may be related to the carcinogenesis and development of ESCC in Kazakh.

Target therapy of gefitinib in advanced adenocarcinoma of the lung / 中国肺癌杂志

<p><b>BACKGROUND</b>Gefitinib is an epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor which is used to treat advanced non-small cell lung cancer, especially adenocarcinoma. The aim of this study is to evaluate the efficacy, side effects and prognostic factors of gefitinib in adenocarcinoma of the lung.</p><p><b>METHODS</b>A total of 26 patients with advanced adenocarcinoma of the lung were enrolled in the study. Gefitinib was orally administered 250mg once daily until disease progression or the occurrence of intolerable toxicity. They were evaluated regularly and their survival was analyzed.</p><p><b>RESULTS</b>In 26 patients, there was 1 with complete regression (3.8%), 11 with partial response (42.3%), 9 with stable disease (34.6%) and 5 with progression of disease (19.2%). The objective response rate was 46.2% and the disease control rate was 80.8%. The median progression-free survival time was 8.2 months and the median overall survival time was 10.4 months. The 1-year survival rate was 31.6%. Age ( < 70 years old), skin rash and CEA decrease were significantly related to longer survival, however, times of prior chemotherapy and gefitinib treatment stage did not influence the survival. Mean PS (ECOG) was 3.0 before treatment, and 1.8 after treatment. Mean symptom relief time was 5.2 days.</p><p><b>CONCLUSIONS</b>Gefitinib is an effective target drug with slight side effect. It can significantly improve quality of life of patients with adenocarcinoma. It can be used as first-line therapy to patients who are not suitable for chemotherapy.</p>