[Assessment of the lagging effect of vegetation response and loss probability in the Pearl River basin under drought stress]. / å¹²æ—±èƒè¿«ä¸‹ç æ±ŸæµåŸŸæ¤è¢«å“åº”çš„æ»žåŽæ•ˆåº”åŠæŸå¤±æ¦‚çŽ‡è¯„ä¼°.

We quantified the lag time of vegetation response to drought in the Pearl River basin (PRB) based on the standardized precipitation evapotranspiration index (SPEI) and normalized difference vegetation index (NDVI), and constructed a vegetation loss probability model under drought stress based on the Bayesian theory and two-dimensional joint distribution. We further quantitatively evaluated the spatial variations of loss probability of four vegetation types (evergreen broadleaf forest, mixed forest, grassland, and cropland) under different drought intensities. The results showed that the drought risk in eastern West River, the upper reaches of North River and East River, and southern Pearl River Delta was obviously higher than that in other regions during 1982-2020. The response time of vegetation to drought in high-altitude areas in the upper reaches of PRB (mostly<3 month) was generally shorter than that in low altitude areas (>8 month). Drought exacerbated the probability of vegetation loss, with higher vulnerability of mixed forest than the other three vegetation types. The loss probability of vegetation was lower in northwestern PRB than that in central PRB.

A metabolomic approach to study triptolide-induced ovarian damage in rats.

Triptolide (TP) is the major active ingredient of Tripterygium wilfordii Hook, a traditional Chinese herb that possesses various pharmacological activities and has been used to treat autoimmune and inflammatory diseases for thousands of years. However, the clinical application of TP is limited due to its multiorgan toxicity, and in particular, its negative impact on female fertility. To date, the specific toxic mechanisms on reproduction induced by TP remain unclear. In the current study, an LC-MS/MS-based metabolomic approach was adopted to study TP-induced reproductive toxicity and its mechanism. Histopathological examination of the ovaries showed that TP significantly induced follicular atresia and decreased the numbers of corpus luteum in rats, as well as reducing the gonadal index and destroying the microstructure of the ovary. Immunohistochemical staining revealed that TP significantly induced apoptosis of rat follicle cells. Metabolomics analysis revealed that 67 and 74 small molecule metabolites in the ovaries and serum, respectively (fold-changes > 1.5, p < 0.05), were significantly different in TP-treated rats compared to CON group rats. Target profiling identified the metabolites arachidonic acid, prostaglandin D2, prostaglandin H2 and prostaglandin E2 as potential serum biomarkers for TP-induced ovary damage.

Can Priming Legal Consequences and the Concept of Honesty Decrease Cheating During Examinations?

Cheating on exams is a very common phenomenon that causes great harm. Various measures, such as chastisement and direct punishment, have been employed to reduce cheating. Previous studies have found that increasing punishment and activating "self-concept maintenance" can reduce this behavior. This study employed a priming paradigm to investigate whether priming legal consequences and the concept of honesty would reduce cheating in examination situations. In experiment 1, a total of 402 freshmen from 17 classes were included in this study. The 185 students in experimental condition were primed for legal consequences. The cheating behaviors and employed analysts were defined to count the number of cheaters. The results show that the number of students cheating in the primed group did not decrease compared to those in the controlled condition. In experiment 2, a total of 386 freshmen from 16 classes participated in this experiment. The 171 students in experimental condition were primed for the concept of honesty. The results also show that the number of students cheating in the primed group did not decrease. This study shows that priming legal consequence and the concept of honesty were not significant in certain situations, such as during examinations. It is suggested that some psychological manipulations in decreasing dishonesty behaviors should be further tested in ecological situations.