Responses of nickel bioavailability and toxicity of Prorocentrum Donghaienses to dissolved organic matter (DOM) fractions incubated in urea.

Urea, nickel (Ni) and dissolved organic matter (DOM) from land varied with different sources have a great impact on the offshore ecosystem. The heterogeneity of Ni bioavailability and toxicity of Prorocentrum donghaiense influenced by DOM fractions incubated in urea was investigated in this study. On the occasion, chlorophyll (Chl a) concentration, growth rate, and photosynthesis parameters were monitored to track changes occurring in the test organism. Chl a concentration and photosynthesis parameters in the treatment of hydrophilic DOM (HPI) with Ni-free was significantly higher than that in the control treatment, and similar data were shown in the treatment of hydrophobic DOM（HPO）with the low Ni environment (0.17µmol L-1). However, the opposite phenomena were observed in the treatments of HPO with the higher Ni environment (over 170µmol L-1). Moreover, the EC50 of Ni for P.donghaiense incubated in HPO was relatively lower than that in HPI and control treatment, which implied that HPO elevated the toxicity of Ni. Therefore, the varied DOM compositions because of different origins, as a chelating agent and potential nutrient source in coastal waters, shows the significantly different bioavailability and toxicity of Ni with the increasing inputs of urea, which in turn influences the dynamics of phytoplankton.

Characteristics and surgical invervention of ovarian torsion in pregnant compared with nonpregnant women.

The aim of our study was to compare the clinical and surgical characteristics of pregnant and nonpregnant women with surgically verified ovarian torsion, as well as the differences among 3 trimesters during pregnancy.We conducted a retrospective study of patients diagnosed with surgically proven ovarian torsion in our hospital from January 2012 to June 2018. The clinical characteristics, surgical procedure, pathologic outcomes, and trimesters of pregnancy were analyzed.Thirty-three pregnant and 72 nonpregnant patients diagnosed with surgically proven ovarian torsion were assessed during the study period. The most common presenting symptom in both groups was abdominal pain (90.2% and 99.0%, respectively). The median time from admission to surgery was shorter in pregnant patients than nonpregnant patients (5.3 compared with 47.7 hours, P < .001). Pregnant patients had a higher number of twists than nonpregnant patients (median of 2 compared with 1, P < .01). Benign cyst was the most common cyst causing ovarian torsion in both groups, and luteum cyst was more common in the pregnant group. The mean size of ovarian cyst in pregnant patients was much smaller in the third trimester than the first and the second trimesters (6.6 ±â€Š2.0, 8.4 ±â€Š2.1and 8.1 ±â€Š1.5 cm, respectively; P = .097). Cystectomy performed in the third trimester was more frequent compared with the other 2 trimesters (77.8%, 26.7%, and 22.2%, respectively; P = .021).Abdominal pain is the most common feature of ovarian torsion. Clinical presentation of ovarian torsion is relatively similar between pregnant and nonpregnant women, and among different trimesters. The tumor size was smaller in the third trimester of pregnancy than the other 2 trimesters of pregnancy. Cystectomy performed in pregnant patients is more during the third trimester compared with the other 2 trimesters.

[Response of Microcystis aeruginosa Growth to Arsenate Under Different Phosphorus Regimes].

To better understand and then to predict the ecological risk of arsenic influenced by phosphorus regimes in freshwater environment, the growth differences of Microcystis aeruginosa (M. aeruginosa) as well as its responses to the toxic stress of arsenate [As(Ⅴ)]were investigated under orthophosphate (DIP) and dissolved organic phosphorous (DOP) [adenosine triphosphate (ATP-P) and ß-sodium glycerophosphate (ß-P)] culture conditions. The results showed that M. aeruginosa grew and proliferated without any differences under DOP and DIP conditions during the first 5 days, while slower growth rates were observed in DOP conditions. Herein, the cell optical density (D) of M. aeruginosa in ß-P and ATP-P conditions was 78.0% and 75.4% of that under DIP condition respectively on the 7th day. The negative correlations between actual quantum yield (Yield) and Chlorophyll a (Chl-a) and D indicated that Yield should not be used as a stable index to reflect the nutrition conditions of algae. However, Yield was a sensitive index to exactly represent the responses of M. aeruginosa to As(Ⅴ) toxicity, which showed significant differences under different phosphorus regimes. Obtained by D, Yield and Chl-a, the 96h EC50 was in the order of DIP > ß-P > ATP-P. The similar toxic tolerant abilities to As(Ⅴ) of M. aeruginosa under ß-P and ATP-P conditions were lower than that of EC50 under DIP conditions by one to five orders of magnitude.

Sinonasal intravascular papillary endothelial hyperplasia successfully treated by endoscopic excision: a case report and review of the literature.

BACKGROUND: Intravascular papillary endothelial hyperplasia (IPEH) is an abundant, usually intravascular, benign endothelial proliferation that may mimic angiosarcoma clinically and histopathologically. Its occurrence in the sinonasal cavity is extremely rare. To the best of our knowledge, we present the first case with the most extensive IPEH ever found within the sinonasal cavity. METHODS: A 42-year-old man of intravascular papillary endothelial hyperplasia in the sinonasal cavity was reported. He complained of a 1-year history of left-sided nasal obstruction accompanied by unilateral rhinorrhea, repeated epistaxes and frontal headache. Anterior rhinoscopy demonstrated a smooth-surfaced reddish mass occupying the left nasal cavity. Endoscopic surgery was used to clear this uncommon tumor in the sinonasal cavity. A review of the pertinent literature was also presented. CONCLUSIONS: IPEH may be mistaken for an angiosarcoma clinically and histopathologically. Complete endoscope-guided surgical excision is the best choice of therapy for patients with IPEH and is both diagnostic and curative. Awareness of this lesion will prevent incorrect diagnosis and overly aggressive treatment.