SUMMARY
Floral patterns are unique to rice and contribute significantly to its reproductive success. SL1 encodes a C2H2 transcription factor that plays a critical role in flower development in rice, ...but the molecular mechanism regulated by it remains poorly understood. Here, we describe interactions of the SL1 with floral homeotic genes, SPW1, and DL in specifying floral organ identities and floral meristem fate. First, the sl1 spw1 double mutant exhibited a stamen‐to‐pistil transition similar to that of sl1, spw1, suggesting that SL1 and SPW1 may located in the same pathway regulating stamen development. Expression analysis revealed that SL1 is located upstream of SPW1 to maintain its high level of expression and that SPW1, in turn, activates the B‐class genes OsMADS2 and OsMADS4 to suppress DL expression indirectly. Secondly, sl1 dl displayed a severe loss of floral meristem determinacy and produced amorphous tissues in the third/fourth whorl. Expression analysis revealed that the meristem identity gene OSH1 was ectopically expressed in sl1 dl in the fourth whorl, suggesting that SL1 and DL synergistically terminate the floral meristem fate. Another meristem identity gene, FON1, was significantly decreased in expression in sl1 background mutants, suggesting that SL1 may directly activate its expression to regulate floral meristem fate. Finally, molecular evidence supported the direct genomic binding of SL1 to SPW1 and FON1 and the subsequent activation of their expression. In conclusion, we present a model to illustrate the roles of SL1, SPW1, and DL in floral organ specification and regulation of floral meristem fate in rice.
Significance Statement
The morphology of rice flowers is crucial for successful reproduction and grain yield. However, research on floral organ specification gene regulatory network (FOS‐GRN) in rice and other grass species is not as extensive as in Arabidopsis. In this study, we unveil the crucial role of the C2H2 zinc finger transcription factor SL1 in regulating flower organ development and floral meristem fate in rice. Our experimental evidence indicates that SL1 positively regulates the expression of SPW1, which, in turn, activates B‐class genes OsMADS2 and OsMADS4 to indirectly suppress DL expression, influencing the formation of floral organs. Additionally, we identify a cooperative role of SL1 and DL in terminating floral meristem fate.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
The repair effects of bone marrow mesenchymal stem cell transplantation on nervous system damage are not satisfactory. Propofol has been shown to protect against spinal cord injury. Therefore, this ...study sought to explore the therapeutic effects of their combination on spinal cord injury. Rat models of spinal cord injury were established using the weight drop method. Rats were subjected to bone marrow mesenchymal stem cell transplantationvia tail vein injection and/or propofol injectionvia tail vein using an infusion pump. Four weeks after cell transplan-tation and/or propofol treatment, the cavity within the spinal cord was reduced. The numbers of PKH-26-positive cells and horseradish peroxidase-positive nerve ifbers apparently increased in the spinal cord. Latencies of somatosensory evoked potentials and motor evoked potentials in the hindlimb were noticeably shortened, amplitude was increased and hindlimb motor function was obviously improved. Moreover, the combined effects were better than cell transplantation or propofol injection alone. The above data suggest that the combination of propofol injection and bone marrow mesenchymal stem cell transplantation can effectively improve hindlimb electro-physiological function, promote the recovery of motor funtion, and play a neuroprotective role in spinal cord injury in rats.
Nowadays, most available information on the degradative behaviour of feeds in ruminants is based on in situ incubation in the rumen, and it is adopted by many feed evaluation systems currently in use ...for ruminants. However, the outcome of.this technique might be affected by many factors such as sequence of nylon bags incubation in the rumen. The objective of current study was to investigate effects of sequence of nylon bag incubation on degradative behavior of dry matter （DM）, crude protein （CP）, neutral detergent fiber （NDF） and acid detergent fiber （ADF） in some feed ingredients commonly used in dairy rations, including alfalfa haylage, corn silage, corn grain and soybean meal. Four multiparous Holstein lactating cows fitted with permanent ruminal cannulas were used. The nylon bags containing feed samples either were placed in the rumen at once and removed at designated time intervals （all in-gradually out method; AG） or were placed in the rumen at designated time points and retrieved at once （gradually in-all out method; GA）. Fractional rate of degradation of potentially degradable fraction, lag time and effective rumen degradability （ED） of DM and CP were significantly higher in the AG compared to the GA method （P〈0.05）. Fractional rates of DM and CP degradation was higher in alfalfa haylage samples incubated in the rumen using the AG method compared to that using the GA method （0.138 h-1 vs. 0.073 h-1 and 0.002 h-1 vs. 0.1125 h-1, for DM and CP, respectively; P〈0.05）. Due to a higher fractional rate of degradation （Kd） of DM and CP, the ED of DM and CP at different fractional passage rates were higher in the AG than those in the GA method （P〈0.05）. Potentially degradable fraction and lag time of NDF were higher in the AG method compared to the GA method （P〈0.05）. Placing all bags in the rumen at once and removing them at designated time intervals compared with introduction of bags in reverse sequence and removing them all at once led to a lower undegradable fraction （U） of NDF in alfalfa （1.8% vs. 4.0%, respectively; P〈0.05） and corn silage （3.3% vs. 6.7%, respectively; P〈0.05） samples. Potentially degradable fraction of ADF was significantly higher in the AG method compared with the GA method （P〈0.05）. Bag incubation sequence had profound effects on kinetics of degradation of DM, CP and NDF in situ in the feed samples studied. The effects were more evident in the forages （especially alfalfa haylage） than in the concentrate ingredientsnamely corn grain and soybean meal..This experiment is the first time to investigate effects of two methods under the same experiment conditions, providing basic data for the determination of ED.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
A novel data association algorithm is developed basal on fuzzy genetic algorithms (FGAs). The static part of data association uses one FGA to determine both the lists of composite measurements and ...the solutions of m-best S-D assignment. In the dynamic part of data association, the results of the m-best S-D assignment are then used in turn, with a Kalman filter state estimator, in a multi-population FGA-based dynamic 2D assignment algorithm to estimate the states of the moving targets over time. Such an assignment-based data association algorithm is demonstrated on a simulated passive sensor track formation and maintenance problem. The simulation results show its feasibility in multi-sensor multi-target tracking. Moreover, algorithm development and real-time problems are briefly discussed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Application of PDCA cycle theory in the teaching of physical diagnostics XIAO Xin, WANG Wei, LI Xiao-kang, SHI Lei, ZHAO Zhi-jing, HUANG Ya-yu, LIANG Rong
Ji chu yi xue yu lin chuang = Jichu yixue yu linchuang = Basic medical sciences and clinics,
09/2020, Volume:
40, Issue:
9
Journal Article
Peer reviewed
Open access
Physical diagnostics functions as a bridge connecting basic medicine courses and clinical medicine courses, and is the basis of all clinical skills. Therefore, its teaching quality is of great ...significance. PDCA cycle is one of the currently acknowledged quality management methods, including four stages: plan, do, check and action, and continuously cycles in this order to manage the quality. This paper implements the concept of PDCA cycle into the teaching of physical diagnostics, formulates the teaching methods under the theory of PDCA and makes a specific analysis, in order to improve learning outcomes of physical diagnostics, enhance the quality of faculty and promote the management of standardized physical diagnostics training, thus providing a reference for optimization the training of physical diagnostics.
Two phenylethanoid glycosides, acteoside and forsythoside B, were first isolated from the traditional Chinese herb Callicarpa peii H.T. Chang. The interaction between the two phenylethanoid ...glycosides and bovine serum albumin （BSA） was investigated by fluorescence, UV vis absorbance and circular dichroism （CD）. The results showed that the quenching mechanism in the drug-BSA binary systems was a combination of static quenching and non- radiative energy transfer. Displacement experiments confirmed that the drug bound to the site I of BSA. UVvis and CD measurements indicated that the binding of the drug to BSA induced conformational changes in BSA.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Background Respiratory distress syndrome （RDS） is one of the most common causes of neonatal respiratory failure and neonatal death, however, its clinical characteristics are very different from ...premature RDS, and these characteristics have not been well documented as yet. This study was to investigate the pathogenesis, clinical characteristics and management strategies of RDS in full-term neonates, with the aim of developing a working protocol for improving the outcome in full-term neonates with RDS. Methods A total of 125 full-term infants with RDS were enrolled in this study. Their clinical and laboratory data were collected for analyzing the characteristics of full-term neonatal RDS. Results （1） The 125 cases included 94 male and 31 female infants, vaginal delivery occurred in 80 cases and cesarean section in 45 cases. （2） The onset time of RDS was （3.11±3.59） hours after birth. （3）The possible reasons included severe perinatal infections in 63 patients, elective cesarean section in 34 cases, severe birth asphyxia in 12 patients, meconium aspiration syndrome in 9 patients, pulmonary hemorrhage in 4 patients and maternal diabetes in 3 patients. （4） Complications included multiple organ system failure （MOSF） in 49 patients, persistent pulmonary hypertension of newborn （PPHN） in 25 patients, acute renal failure in 18 patients, severe hyperkalemia in 25 patients, severe metabolic acidosis in 6 cases, severe myocardial injury in 9 cases, pulmonary hemorrhage in 3 cases, disseminated intravascular coagulation in 14 patients and shock in 12 patients.（5） Four patients died, the mortality was therefore 3.2% with the main cause of septicemia complicating of MOSF, but their prognosis was improved while comprehensive treatment measures including early mechanical ventilation and broad spectrum antibiotics were taken into account. Conclusions RDS is not an uncommon disease in full-term infants and is associated with a higher mortality, its clinical characteristics are very different from premature RDS, and its onset is earlier and is more likely to develop into PPHN and/or MOSE The main cause of death is severe infection complicating of MOSF and most patients require prolonged mechanical ventilation. Comprehensive management strategies will help to improve patient＇s prognosis.
With the development of science and technology, great changes have taken place in medical education, making it increasingly complicated and diversified. For medical students who have just finished ...basic medicine courses and are preparing for their hospital internships, it is difficult to gain experience performing direct physical examinations on patients. Currently, residents＇ clinical skills are assessed very strictly; simply taking notes and reciting facts will not suffice. Because considerable attention is being paid to medical students＂ clinical skills on a national level,
Food restriction （FR） and refeeding （Re） have been suggested to impair body mass regulation and thereby making it easier to regain the lost weight and develop over-weight when FR ends. However, it is ...unclear if this is the case in small mammals showing seasonal forging behaviors. In the present study, energy budget, body fat and serum leptin level were measured in striped hamsters that were exposed to FR-Re. The effects of leptin on food intake, body fat and genes expressions of several hypothalamus neuropeptides were determined. Body mass, fat content and serum leptin level decreased during FR and then increased during Re. Leptin supplement significantly attenuated the increase in food intake during Re, decreased genes expressions of neuropepetide Y （NPY） and agouti-related protein （AgRP） of hypothalamus and leptin of white adipose tissue （WAT）. Hormone-sensitive lipase （HSL） gene expression of WAT increased in leptin-treated hamsters that were fed ad libitum, but decreased in FR-Re hamsters. This indicates that the adaptive regulation of WAT HSL gene expression may be involved in the mobilization of fat storage during Re, which partly contributes to the resistance to FR-Re-induced overweight. Leptin may be involved in the down regulations of hypothalamus orexigenic peptides gene expression and consequently plays a crucial role in controlling food intake when FR ends.
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FFLJ, NUK, ODKLJ, UL, UM, UPUK
Background Several studies suggest that cyclooxygenase-2 （COX-2） contributes to the delayed progression of ischemic brain damage. This study was designed to investigate whether COX-2 inhibition with ...parecoxib reduces focal cerebral ischemia/eperfusion injury in rats. Methods Ninety male Sprague-Dawley rats were randomly assigned to three groups： the sham group, ischemia/reperfusion （I/R） group and parecoxib group. The parecoxib group received 4 mg/kg of parecoxib intravenously via the vena dorsalis penis 15 minutes before ischemia and again at 12 hours after ischemia. The neurological deficit scores （NDSs） were evaluated at 24 and 72 hours after reperfusion. The rats then were euthanized. Brains were removed and processed for hematoxylin and eosin staining, Nissl staining, and measurements of high mobility group Box 1 protein （HMGB1） and tumor necrosis factor-α （TNF-α） levels. Infarct volume was assessed with 2,3,5-triphenyltetrazolium chloride （TTC） staining. Results The rats in the I/R group had lower NDSs （P 〈0.05）, larger infarct volume （P 〈0.05）, lower HMGB1 levels （P 〈0.05）, and higher TNF-α levels （P 〈0.05） compared with those in the sham group. Parecoxib administration significantly improved NDSs, reduced infarct volume, and decreased HMGB1 and TNF-α levels （P 〈0.05）. Conclusions Pretreatment with intravenous parecoxib was neuroprotective. Its effects may be associated with the attenuation of inflammatory reaction and the inhibition of inflammatory mediators.
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