[Mechanism of Inorganic Nitrogen Transformation and Identification of Nitrogen Sources in Water and Soil].

Nitrogen plays a vital role in biological activities as the basic element of organic molecules and the main nutrient of soil. In the study of nitrogen pollution, the first step is to understand the transformation mechanism of various nitrogen forms. Based on the transformation process and the mechanism of nitrogen in the ecosystem, this review summarizes the research methods of nitrogen source analysis and nitrogen isotope fractionation in soil and water, and categorically reviews the applications of nitrogen source identification in surface water and groundwater.

Upregulation of RND3 Affects Trophoblast Proliferation, Apoptosis, and Migration at the Maternal-Fetal Interface.

Trophoblasts as the particular cells of the placenta play an important role in implantation and formation of the maternal-fetal interface. RND3 (also known as RhoE) is a unique member of the Rnd subfamily of small GTP-binding proteins. However, its function in cytotrophoblasts (CTBs) at the maternal-fetal interface is poorly understood.

Ulcerative colitis complicated with colonic necrosis, septic shock and venous thromboembolism: A case report.

Background: Severe total colonic necrosis, septic shock and venous thromboembolism secondary to ulcerative colitis (UC) are rare and life-threatening. No such severe complications have been reported in the literature.

Case Summary: We report a 36-year-old woman who developed total colonic necrosis and septic shock secondary to UC.

Tumour necrosis factor-α gene -308 G > A and -238 G > A polymorphisms are associated with susceptibility to irritable bowel syndrome and drug efficacy in children.

What Is Known And Objective: An imbalance in the genetically controlled pro- and anti-inflammatory cytokine production could potentially promote ongoing low-grade inflammation following an episode of acute gastroenteritis and, subsequently, could result in irritable bowel syndrome (IBS; post-infectious IBS, PI-IBS). Since there is very little known on the impact of pro-inflammatory cytokines such as tumour necrosis factor-α (TNF-α) on IBS, we conducted the present study with aims of determining the correlation between TNF-α gene polymorphisms (-308 G > A and -238 G > A) and susceptibility to IBS and drug efficacy in children.

Methods: Diarrhoea-predominant IBS patients and healthy subjects were recruited for DNA extraction.

LncRNA SLC8A1-AS1 protects against myocardial damage through activation of cGMP-PKG signaling pathway by inhibiting SLC8A1 in mice models of myocardial infarction.

Extensive investigations into long noncoding RNAs (lncRNAs) in various diseases and cancers, including acute myocardial infarction (AMI) have been conducted. The current study aimed to investigate the role of lncRNA solute carrier family 8 member A1 antisense RNA 1 (SLC8A1-AS1) in myocardial damage by targeting solute carrier family 8 member A1 (SLC8A1) via cyclic guanosine 3',5'-monophosphate-protein kinase G (cGMP-PKG) signaling pathway in AMI mouse models. Differentially expressed lncRNA in AMI were initially screened and target relationship between lncRNA SLC8A1-AS1 and SLC8A1 was then verified.

Effects of MicroRNA-592-5p on Hippocampal Neuron Injury Following Hypoxic-Ischemic Brain Damage in Neonatal Mice - Involvement of PGD2/DP and PTGDR.

Background/aims: This study aimed to explore the effect of microRNA-592-5p (miR-592-5p) on hypoxic-ischemic brain damage (HIBD)-induced hippocampal neuronal injury in a neonatal mouse model relative to the involvement of one target gene, PTGDR, and the PGD2/ DP signaling pathway.

Methods: A total of 30 neonatal mice aged 7 days were randomly selected to establish an HIBD mouse model. Hippocampal neuronal cells were transfected into a control group, a blank group, a negative control (NC) group, an miR-592-5p mimics group, an miR-592-5p inhibitors group, an siRNA-PTGDR group and an miR-592-5p inhibitors + siRNA-PTGDR group.

Elevated serum levels of ghrelin and TNF-α in patients with cyanotic and acyanotic congenital heart disease.

Background: The levels of ghrelin and tumor necrosis factor alpha (TNF-α) are considered biological markers of congenital heart diseases (CHD). The present meta-analysis was conducted to investigate the clinical significance of serum levels of ghrelin and TNF-α in children with (CHD).

Methods: Chinese and English scientific literature databases were searched to retrieve published studies relevant to ghrelin, TNF-α and CHD.

Electro-optical equivalent calibration technology for high-energy laser energy meters.

Electro-optical equivalent calibration with high calibration power and high equivalence is particularly well-suited to the calibration of high-energy laser energy meters. A large amount of energy is reserved during this process, however, which continues to radiate after power-off. This study measured the radiation efficiency of a halogen tungsten lamp during power-on and after power-off in order to calculate the total energy irradiated by a lamp until the high-energy laser energy meter reaches thermal equilibrium.

Generalized design of a zero-geometric-loss, astigmatism-free, modified four-objective multipass matrix system.

During this study we constructed a generalized parametric modified four-objective multipass matrix system (MMS). We used an optical system comprising four asymmetrical spherical mirrors to improve the alignment process. The use of a paraxial equation for the design of the front transfer optics yielded the initial condition for modeling our MMS.

Technology for radiation efficiency measurement of high-power halogen tungsten lamp used in calibration of high-energy laser energy meter.

The calibration method using a high-power halogen tungsten lamp as a calibration source has many advantages such as strong equivalence and high power, so it is very fit for the calibration of high-energy laser energy meters. However, high-power halogen tungsten lamps after power-off still reserve much residual energy and continually radiate energy, which is difficult to be measured. Two measuring systems were found to solve the problems.

Toxic effects of ionic liquid 1-octyl-3-methylimidazolium bromide on the antioxidant defense system of freshwater planarian, Dugesia japonica.

The activities of antioxidant enzymes and the levels of glutathione (GSH) and malondialdehyde (MDA) were determined when freshwater planarian Dugesia japonica was exposed to different concentrations of 1-octyl-3-methylimidazolium bromide ([C8mim]Br) for one, three, and five days. The results showed that superoxide dismutase (SOD) activity began to increase in all treated groups after three days of exposure, while catalase (CAT) activity was inhibited after the first day, but increased notably on the fifth day except for the lowest concentration group. The activity of glutathione peroxidase (GPX) was induced from the first day of exposure and increased significantly after five days in all treated groups.

Cardioprotective Effect of MicroRNA-21 in Murine Myocardial Infarction.

Introduction: To investigate the cardioprotective effect of MicroRNA-21 (miR-21) in murine myocardial infarction (MI).

Methods: Forty C57BL/6 male mice were divided into sham group, MI group, LV-GFP group, and miR-21 group. Mice in the MI group, LV-GFP group, and miR-21 group were subjected to MI by left anterior descending artery (LAD) ligation, while chest was opened/closed without ligation in sham group.

Research on temperature measurement technology for graphite-cone-absorption-cavity absolute calorimeter.

The nonlinear effect of materials and sensors in high-energy laser calorimeters is especially obvious-due to the steep temperature gradients of their absorbers. Significant measurement errors occur when traditional integral temperature sensors and methods are utilized. In an effort to remedy this, a method is proposed in this paper in which an absorption cavity is divided into many parts and multiple discrete thermocouple sensors are used to measure the temperature rise of the absorbers.

The complete mitochondrial genome of Leizhou goat Capra hircus (Bovidae; Caprinae).

Leizhou goat (Capra hircus) is one of the famous native goat breed in China. In this study, the 16,651 bp complete nucleotide sequence of Leizhou goat mitochondrial genome was sequenced for the first time. It contained 22 tRNA genes, 2 ribosomal RNA genes, 13 protein-coding genes.

[Depth selectivity by using polarization-controlled spectral technique].

A continuous depth selectivity is examined by changing the state of polarization of the signal light, based on the orthogonal polarization spectral (OPS) microcirculation imaging system. Unlike the traditional OPS system, which could only rend a two dimensional image of a certain cross-section, the elliptically polarized light controlled by the polarizer unit and the analyzer unit could do the microscopy refocusing without mechanically scanning the sample, as a result, the tissue information at different depths could be obtained. Because the proposed system matches the emission spectrum of the light source with the absorption spectrum of the erythrocyte, it has relatively high signal-to-noise ratio, and could be used to detect microcirculation.

[Simulated study of algal fatty acid degradation in hypoxia seawater-sediment interface along China coastal area].

Series of laboratory incubation experiments were conducted to simulate degradation of organic matter in sediment-seawater interface in hypoxia enviroments along China coastal area. Under four different redox conditions (oxygen saturation: 100%, 50%, 25% and 0%), degradations of seveal biomarkers originated from Skeletonema costatum, a typical red tide alage along China coastal area were tracked. By analyzing concentrations of four fatty acid biomarkers [14:0, 16:0, 16:1(7) and 20:5] obtained at various sampling time, results showed that their concentrations decreased significantly after 2-3 weeks' incubation.

Modified physiological and operative score for the enumeration of mortality and morbidity risk assessment model in general surgery.

Aim: To establish a scoring system for predicting the incidence of postoperative complications and mortality in general surgery based on the physiological and operative severity score for the enumeration of mortality and morbidity (POSSUM), and to evaluate its efficacy.

Methods: Eighty-four patients with postoperative complications or death and 172 patients without postoperative complications, who underwent surgery in our department during the previous 2 years, were retrospectively analyzed by logistic regression. Fifteen indexes were investigated including age, cardiovascular function, respiratory function, blood test results, endocrine function, central nervous system function, hepatic function, renal function, nutritional status, extent of operative trauma, and course of anesthesia.

[A study on individual mandibular prostheses according to 3D reconstruction of CT images and CNC simulation method].

The new method of manufacturing individual mandibular prostheses, in combination with CT data and CNC technique, can duplicate bone tissues accurately, and can have the individual mandibular prosthesis made to order, and repair the mandibular defect (especially the lager mandibular segmental defect).