[Hydrochemical Characteristics and Control Factors of Groundwater in the Northwest Salt Lake Basin].

Taking the Tugeligaole sub-basin of the Jilantai Salt Lake Basin in Inner Mongolia as the typical study area, the groundwater samples of 22 points were collected, and their main characteristic indexes were tested during the wet season and the dry season separately in 2021. Mathematical statistics, Piper triangular diagrams, a Gibbs plot, ionic relations, and factor analysis were used to analyze and discuss the hydrochemical characteristics and formation mechanism of groundwater in different periods. Based on the evaluation of the groundwater quality using the water quality index(WQI) method, the potential risks of groundwater Cr6+ and F- were evaluated using the health risk evaluation model. The results showed that the groundwater was overall weakly alkaline; the dominant anions and cations during the different periods were Cl- and Na+, and the water chemistry type was mainly Cl--Na+; the groundwater quality was generally good, and the difference in water quality between the wet season and the dry season was not significant; adults and children had higher carcinogenic health risks in the dry season than that in the wet season, and the health risks of children were significantly higher than those in adults. The maximum carcinogenic health risk of drinking water exposure to Cr6+ in adults and children was higher than the maximum acceptable risk level(5×10-5). The chemical evolution of groundwater was mainly affected by evaporative concentration, evaporative salt rock dissolution, and cation exchange, and the main control factors were evaporative concentration(contribution rate of 54.19%), native geological environment factors(contribution rate of 12.99%), and carbonate rock dissolution(contribution rate of 11.66%). The study results have significance to some degree to the sustainable exploitation and utilization of groundwater resources and environmental protection of the salt lake basin.

Recurrent abdominal pain due to small bowel volvulus after transabdominal preperitoneal hernioplasty: A case report and review of literature.

BACKGROUND: Compared with open mesh repair, transabdominal preperitoneal (TAPP) hernioplasty results in less chronic postoperative inguinal pain and faster postoperative recovery. However, it may still lead to rare but serious complications. Here we report a case of intestinal volvulus with recurrent abdominal pain as the only clinical symptom, which occurred 3 mo after TAPP repair for bilateral inguinal hernia. CASE SUMMARY: A 50-year-old male patient underwent laparoscopic TAPP for bilateral inguinal hernias. After the operation, he experienced recurring pain in his lower right abdomen around the surgical area, which was relieved after symptomatic treatment. Three months after the surgery, the abdominal pain became severe and was aggravated over time. The whirlpool sign of the mesentery was seen on contrast-enhanced computed tomography (CT). Laparoscopic exploration confirmed that a barb of the V-Loc™ suture penetrated the peritoneum, which caused the adhesion of the small intestinal wall to the site of peritoneal injury, forming intestinal volvulus. Since there was no closed-loop obstruction or intestinal ischemia, recurrent abdominal pain became the only clinical manifestation in this case. After laparoscopic lysis of adhesions and reduction of intestinal volvulus, the patient recovered and was discharged. CONCLUSION: The possibility of intestinal volvulus should be considered in patients who experience recurrent abdominal pain following TAPP surgery during which barbed V-Loc sutures are used for closing the peritoneum. Contrast-enhanced CT and active laparoscopic exploration can confirm the diagnosis and prevent serious complications.

[Community Composition of nirS-type Denitrifying Bacteria in the Waters of the Lower Reaches of the Fenhe River and Its Relationship with Inorganic Nitrogen].

In order to assess the waters of the lower reaches of the Fenhe River and the interaction with inorganic nitrogen, Illumina high-throughput sequencing technology was used to analyze samples based on the analysis of water quality indicators of nine rivers. The community structure and diversity of nirS-type denitrifying bacteria was diagnosed and statistical analysis was carried out to analyze the relationship between these communities and inorganic nitrogen content. The results show that the lower reaches of the Fenhe River are seriously polluted with inorganic nitrogen and the overall water quality standard was classified as V. The range of calculated Shannon index values was 3.36-7.54, indicating that the diversity of the denitrifying bacterial community is high in this basin. The relative abundance of the dominant genera represented 89.8% of the total community, which included Rhodobacter, Pseudomonas, and Thauera. The DO, pH, and inorganic nitrogen content were the main factors affecting the denitrifying bacterial community in the lower reaches of the Fenhe River. The dominant genus, Rhodobacter, and the genus Thauera were negatively correlated with NO3--N and NO2--N, and were positively correlated with NH4+-N. Pseudodomomas was the dominant genus in the Jishan and Hejin areas, and in the Fenhe River feeding into the Yellow River, and was negatively correlated with NO3--N and NO2--N but positively correlated with NH4+-N. The dominant genera of nirS-type denitrifying bacteria in the lower reaches of the Fenhe River promote denitrification and play a role in reducing the content of nitrate nitrogen in the water.

[Analysis of Nitrate Pollution Sources in the Rainy Season of the Lower Fenhe River].

Through the application of multi-isotope tracing, IsoSource model calculation, and microbial detection, the source of nitrate pollution in the lower reaches of the Fenhe River was screened, and the contribution rate of each source was calculated. The results showed that the main forms of nitrogen-containing substances in the lower reaches of the Fenhe River are NO3--N and NH4+-N and that the NO3--N content in 77.8% of the samples exceed the national drinking water standard. The abundance of denitrifying microorganisms in Jishan, Hejin, and the Fenhe River into the Yellow River is high, and many dominant bacteria participate in denitrification, resulting in nitrogen fractionation. The contents of δ15N-NO3- and δ18O-NO3- in the isotopes ranged from 5.30‰ to 12.90‰ and from 1.3‰ to 1.8‰, respectively. Manure and sewage were the main sources of nitrate in the Linfen section, accounting for 68% of the total nitrate source. In the Xiangfen section, the main sources of nitrate in the river were manure and sewage, at 37.5%, and agricultural fertilizer, at 37%. Agrochemicals are the main sources of nitrate in the Hejin section of the river, with a contribution ratio of 49.3%.

The clinical significance of CDK1 expression in oral squamous cell carcinoma.

OBJECTIVES: To evaluate the clinical significance of cyclin-dependent kinase 1 (CDK1) in 77 oral squamous cell carcinomas (OSCC) using immunohistochemical methods. STUDY DESIGN: Immunohistochemical expression of CDK1 was compared with various clinicopathological features in 77 OSCC and 60 controlled epithelia adjacent to the tumours. In addition, correlation of CDK1 expression and prognostic and the 5-year accumulative survival rate of OSCC were investigated. RESULTS: The CDK1 protein was expressed in 52 cases of 77 tumor tissues (67.5%), compared with 21 cases of 60 controlled (35.0%). The expression of CDK1 was significantly correlated with the histological grade of OSCC (P<0.05). The CDK1 protein was over-expressed in recurrent tumors or in those with lymph node metastasis. Statistical analysis showed a significant reduction in the 5-year accumulative survival rate in CDK1 positive cases compared with CDK1 negative cases (P<0.05). Namely, the CDK1 positive patients had poor prognosis. CONCLUSIONS: The expression of CDK1 might serve as malignant degree and prognostic markers for the survival of OSCC.

[A survey on cerebral infarction/transient ischemic attack inpatients compliance with secondary stroke prevention and follow-up 90 days].

OBJECTIVE: Poor compliance with evidence-based-medicine guidelines could significantly influence the effect of stroke prevention strategies. The objectives of this survey are to investigate the current status in Beijing of cerebral infarction/TIA (transient ischemic attack) inpatients' adherence to the evidence-based-medicine secondary prevention and behavior modifications both at the discharge and at 90-day follow up. METHODS: The survey included cerebral infarction/TIA patients successively admitted from 1, Oct 2006 to 1, May 2007, used ACEI/ARB, Statin, anti-platelet agents therapy, accepted carotid endarterctomy or angioplasty or stent, and modified behaviors to stop smoking and control weight. Data of patients during hospitalization were obtained from the medical documents in the inpatient department of 7 centers. The detailed information included the medicine therapy, lifestyle modifications, patients' social demographic background (age, sex, education and way of payment), major risk factors for stroke, and ischemic event subtypes (TIA or cerebral infarction). Above information of part of patients were collected through telephone interview at 90-day follow-up if the patients were not able to visit the clinic. RESULTS: 708 cerebral infarction/TIA inpatients who didn't have contraindications were included. Among them, the patents who haven't used anti-platelet agents, nor taken statin, nor accepted ACEI/ARB were about 0.4%, 41.8% and 63.6% respectively. Neither 27% of the patients have accepted the instructions on stop smoking. While about 588 patients suitable to drug therapy were followed up at 90 days, but the percentage of these patients who haven't compliance on anti-platelet agents, statin, ACEI/ARB was 26.9%, 52.6% and 59.4% respectively. Only 66.9% of the smoking patients have received the doctor instructions on smoking cessation. CONCLUSION: Stroke recurrence rate in China is higher than that of average figures in western countries. One of the key reasons of high recurrence of stroke in China is the poor adherence to stroke secondary prevention guidelines. Thus, investigate current status of secondary prevention among hospitals in capital of China and promote strategies to enhance the adherence to the guidelines and fill the gap between the clinical practice and evidence-based medicine in China, which is able to lower the stroke recurrence and save lives are urgently needed. Physician should take great care of the patient's compliances on the evidenced-based-medicine secondary prevents and behavior modifications, and take effective measures to improve the compliances.