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Selenium (Se) is an essential trace element for organisms. Se deficiency will cause diseases such as Keshan disease and Kashin-Beck in human being, and huge loss to animal husbandry. Currently available Se supplements have such problems as low Se content, poor bioavailability, and poor safety. Chlorella pyrenoidosa can produce bioavailable and safe organic Se under suitable conditions, which is thus a promising Se supplement. Therefore, in this study, we tried to improve the Se tolerance and accumulation of C. pyrenoidosa by directional adaptation. To be specific, we gradually increased the concentration of Na2SeO3 in medium to domesticate C. pyrenoidosa and optimized the adapting time and concentration gradient of Na2SeO3 during the adaptation. The results showed that the adapted C. pyrenoidosa was more tolerant to Se and had stronger Se enrichment ability. In 5 L fermenter, the adapted strains could tolerate 40 mg/L Na2SeO3 and the synthesis rate of organic Se was 175.6% higher. Then, Se addition method in the 5 L fermenter was optimized. The result demonstrated that addition of Na2SeO3 at 40 mg/L during heterotrophic culture achieved the final dry weight of C. pyrenoidosa cells at 106.4 g/L, content of organic Se at 1 227 mg/kg, and synthesis rate of organic Se at 1.36 mg/(L·h). Compared with the reported highest cell density of 75 g/L and the highest organic Se content of 560 mg/kg, the corresponding figures in this study were 41.9% and 119.1% higher, respectively. In conclusion, directional adaptation can remarkably improve the Se tolerance and enrichment of C. pyrenoidosa.
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Animals , Humans , Selenium/pharmacology , Chlorella , Heterotrophic ProcessesABSTRACT
Objective:To summarize the clinical characteristics of patients with coronavirus disease 2019 (COVID-19) infected with Delta variant, so as to provide further references for clinical diagnosis and treatment.Methods:A real-world study was conducted to analyze the characteristics of 166 COVID-19 patients infected with Delta variant at Guangzhou Eighth People’s Hospital, Guangzhou Medical University.Results:The study enrolled 5 asymptomatic cases, 123 non-severe cases (mild and moderate type), and 38 severe cases (severe and critical type). Among these patients, 69 (41.6%) were male and 97 (58.4%) were female, with a mean age of 47.0±23.5 years. Thirty-nine cases (23.5%) had received 1 or 2 doses of inactivated vaccine. The incidence of severe COVID-19 cases was 7.7% in 2-doses vaccinated patients, which was lower than that of 11.5% in 1-dose and 26.8% in unvaccinated patients. The proportion of severe cases in 2 dose-vaccinated patients was 7.7%, which was lower than that of 11.5% in 1-dose vaccinated patients and 26.8% in unvaccinated patients, but the difference was not significant ( P>0.05). The most common clinical symptom was fever (134 cases, 83.2%), and 39.1% of cases presented with high-grade fever (≥39 °C); other symptoms were cough, sputum, fatigue, and xerostomia. The proportion of fever in severe cases was significantly higher than that of non-severe cases (97.4% vs. 76.4%, P<0.01). Similarly, the proportion of severe cases with high peak temperature (≥39 ℃) () was also higher than that of non-severe cases (65.8% vs. 30.9%, P<0.01). The median minimal Cycle threshold (Ct) values of viral nucleic acid N gene and ORFlab gene were 20.3 and 21.5, respectively, and the minimum Ct values were 11.9 and 13.5, respectively. Within 48 h of admission, 9.0% of cases presented with decreased white blood cell counts, and 52.4% with decreased lymphocyte counts. The proportions of increased C-reactive protein, serum amyloid A, interleukin 6, and interleukin 10 were 32.5%, 57.4%, 65.3%, and 35.7%, respectively. The proportions of elevated C-reactive protein, serum amyloid A and interleukin-6 in severe cases were significantly higher than those in non-severe cases ( P<0.01). Logistic regression analysis showed that older age and higher peak temperature were associated with a higher likelihood of severe cases ( OR>3, 95% CI: 2-7, P<0.01). In terms of treatment, traditional Chinese medicine (TCM) was used in 97.6% of non-severe cases and 100% in severe cases. Other treatments included respiratory and nutritional support, immunotherapy (such as neutralizing antibodies and plasma of recovered patients). The median times from admission to progression to severe cases, of fever clearance, and of nucleic acid conversion were 5 days, 6 days and 19 days, respectively. No deaths were reported within 28 days. Conclusions:The symptoms of Delta variant infection in Guangzhou are characterized by a high proportion of fever, high peak temperature, long duration of fever, high viral load, a long time to nucleic acid conversion, and a high incidence of severe cases. The severe cases exhibit a higher percentage of elderly patients, a longer duration of fever and have a higher fever rate and a higher hyperthermia rate than non-severe cases. Age and hyperthermia are independent risk factors for progression to severe disease. The combination of TCM and Western medicine can control the progression of the disease effectively.
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Objective:To test the factor structure and psychometric properties of the Chinese version of the Connor Davidson Resilience Scale (CD-RISC) in schizophrenia patients. In order to provide resilience scale for schizophrenia patients in China.Methods:A convenient sampling method was used to select 503 inpatients with schizophrenia in Chifeng Anding hospital from December 2017 to December 2018. The Chinese version of CD-RISC was used to conduct a questionnaire survey. Data processing was performed using SPSS 23.0 statistical software and AMOS 24.0 software.Results:The item analysis showed that the Chinese version of CD-RISC could discriminate the high-score group from the low-score group ( P<0.01). Pearson correlation analysis and principal component analysis showed that the correlation between item 3 and the total amount was poor, and it was considered to be deleted. A total of 6 common factors were extracted from the revised exploratory factor analysis of the CD-RISC, and the cumulative variance contribution rate was 50.79%. The Cronbach α coefficient was 0.882, and the test-retest reliability was 0.912 after two weeks. Confirmatory factor analysis fitted index: χ2/ df was 1.057, RMSEA was 0.015, GFI was 0.926, CFI was 0.989, and IFI was 0.989. Conclusions:The revision 24-item CD-RISC has good psychometric properties, it could be used to assess resilience in Chinese patients with schizophrenia.
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Objective To explore the relationship between brain injury related symptom groups and acute stress disorder( ASD). Methods Totally 301 patients with brain injury hospitalized in the Affiliated Hospital of North China University of Technology from March 2017 to March 2018 were recruited. The pa-tients were assessed by Stanford Acute Stress Response Questionnaire ( SASRQ), Brain Trauma Subscale (BIS) and Pittsburgh Sleep Quality Index (PSQI). Results The prevalence of acute stress disorder pa-tients with brain injury was 46. 51% (140/301). The SASRQ score of all patients with brain injury was (70. 78±28. 00). Univariate analysis showed that there were significant differences in age (χ2= 4. 172,P=0. 041),personality type (χ2= 57. 281,P<0. 001),sleep quality ( χ2= 70. 785,P<0. 001),hospitalization frequency (χ2= 43. 547,P<0. 001),depression,obsessive-compulsive and hostile symptoms between pa-tients with and without ASD ( P<0. 05). The scores of depression and obsessive-compulsive symptoms were significantly correlated with SASRQ scores(P<0. 05). The scores of hostility symptoms were significantly cor-related with SASRQ scores except for patients who lost their temper uncontrollably ( r=0. 176-0. 698,P<0. 05). Personality ( OR=0. 243,95% CI=0. 142-0. 415),sleep disorders( OR=0. 072,95% CI=0. 029-0. 178),hospitalization times(OR=0. 129,95%CI=0. 054-0. 306),depressive symptoms( OR=1. 260,95% CI=1. 061-1. 497),obsessive-compulsive symptoms(OR=1. 419,95%CI=1. 239-1. 625) and hostile symp-toms(OR=1. 253,95%CI=1. 058-1. 482) were the influencing factors of ASD in patients with brain injury (P<0. 05). Conclusion The incidence of ASD is higher in patients with brain injury. Personality type,hos-pitalization,sleep quality,depressive symptoms,obsessive-compulsive symptoms and hostile symptoms are the influencing factors,which should be paid more attention.
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Objective To study the risk factors for perioperative heart failure in the elderly patients with femoral intertrochanteric fracture so as to provide guide information for prevention of the perioperative heart failure.Methods Included in this retrospective study were 175 elderly patients with femoral intertrochanteric fracture who had undergone closed reduction and intramedullary nail fixation in our hospital from May 2013 to August 2016.They were divided into 2 groups.In the heart failure group of 31 cases,there were 12 males and 19 females,with an age of 73.5 ± 7.8 years;in the non heart failure group of 144 cases,there were 61 males and 83 females,with an age of 69.8 ± 6.9 years.The 2 groups were compared in terms of age,early surgery,hypertension history,respiratory disease history,heart disease history,disturbance of consciousness,preoperative renal function,operation time,anesthesia method,operation time,perioperative fluid volume difference,perioperative pain score,and postoperative hemoglobin.After univariate analysis of these factors,the risk factors were determined through the multivariate regression analysis.Results The univariate analysis showed that age,heart disease history,perioperative fluid volume difference and perioperative pain score were statistically different between the 2 groups (P ＜ 0.05).By the multivariate analysis,the risk factors for perioperative heart failure were age [P =0.014,OR =1.063 (1.012,1.116)],heart disease history [P =0.008,OR =4.977 (1.526,16.230)],perioperative fluid volume difference [P =0.025,OR=2.421 (1.117,5.249)],and perioperativepain score [P=0.040,OR=2.292(1.040,5.050)].Conclusions Age,heart disease history,perioperative fluid volume difference and perioperative pain score may be the risk factors for perioperative heart failure in elderly patients with femoral intertrochanteric fracture.We should pay attention to these factors and evaluate their influences on the patient so as to take appropriate perioperative prevention and treatment measures to reduce the incidence of perioperative heart failure.
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Objective To investigate the status quo of the cerebral injury in patients with acute stress disorder (ASD) and the impact of family function,mental toughness,and the characteristics of brain lesions on it.Methods A total of 349 patients were enrolled from North China University of Science and Technology affiliated hospital neurology department and neurosurgery department from May 2016 to November 2016 and they were tested with Stanford Acute Stress Reaction Questionnaire (SASRQ),the family function assessment scale (APGAR),Chinese version of mental toughness scale (CD-RISC).Results 349 cases of patients with SASRQ score (57.21±44.97),8 to 39 160 people (45.8％),40 to 56 85 people (24.4％),57 to 150 104 people (29.8％).The results showed that whether the hemiplegia (β=-0.030),family function (β=-0.032),mental toughness (β=0.886),disturbing degree (β=0.052),bad days (β=0.060)were picked in the regression equation (P＜0.05).Conclusion There were obvious acute stress symptoms in patients with brain injury.The individuals who have family dysfunction,the worse the psychological resilience and the higher the disturbance degree of the patients with hemiplegia,may be likely to get acute stress disorder.
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Objective To investigate the burden status quo of caregivers in stroke patients with home enteral nutrition and to analyze the factors influencing the caregivers burden.Methods A total of 202 direct caregivers in stroke patients with enteral nutrition treatment during hospitalization period in this hospital and continued home enteral nutrition after discharge from hospital were collected as the study subjects.The Caregiver Burden Inventory,Self—Rating Anxiety Scale,Self—Rating Depression Scale,patients and caregivers general condition questionnaire were adopted to conduct the survey.The burden level status of caregivers and its related influencing factors were statistically analyzed.Results The results showed that the burden total score in 202 caregivers receiving the investigation was (50.17± 9.75) points.The univariate analysis results showed that that the age of caregivers,family income per capita level,whether caregivers having negative emotions (anxiety or depression),care time,NIHSS scores of patients and feeding mode burden score had statistical differences (P＜0.05).The multivariate analysis results showed that the care time of caregivers,feeding mode,accompanying anxietyor depression in caregivers,NIHSS scores of patients were the main influencing factors of caregivers burden(P＜0.05).Conclusion The caregivers have a great burden in caring the patients,which should arouse attention.
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Objective To compare the biomechanical stability of different fixation methods for unstable pelvic fractures, so as to provide references for clinical treatment. Methods An unstable pelvic fracture model (Tile C) with the sacroiliac joint dislocation at one side and the pubic rami fracture was constructed via three-dimensional finite element method. In the front of the pelvis, the fracture models were fixed with anterior pelvic Stoppa approach (ASA),subcutaneous anterior pelvic approach (APA), anterior pelvic ilioinguinal approach (AIA) and anterior pelvic external fixation (AEF),and the rear was fixed with sacroiliac joint screw (SIJS）and posterior tension-band plate (PTP). The Von Mises stress and strain distributions of fracture models fixed by different combinations of fixation approaches were analyzed under simulated standing conditions. Results After the models were applied with 500 N vertical load, the maximum stresses at the fracture sites were all reduced, which were smaller than 10 MPa in the front of the pelvis. The maximum stress at the anterior and posterior part of implants in sequence was ASA＜AIA＜AEF＜APA, and the average displacement under the same stress in sequence was ASA＜AIA＜AEF＜APA. Meanwhile, the maximum stresses at the sacroiliac joint and the posterior part of implants in PTP group were significant smaller than those in SIJS group, and the maximum total displacement and vertical displacement in PTP group were also smaller than those in SIJS group. Conclusions Unstable pelvic fractures could be significantly improved when the fracture was fixed by implants in eight combined methods. However, the overall biomechanical properties of the AIA groups were superior to those of the AEF groups and the APA groups. The stability of PTP groups in the treatment of posterior injury was better than that of SIJS groups.
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Objective To explore the effect of mindfulness-based music therapy (MBMT) on sleep-wakefulness behavior in patients with acute stress disorder (ASD) coexisting sleep disorder with cerebral hemorrhage. Methods A total of 70 patients with cerebral hemorrhage and ASD coexisting sleep disorders were randomly divided into two groups (n=35 each group). The study group was treated with mindfulness and soothing music training on the basis of routine treatment for 28 consecutive days. The control group only received routine treatment. Polysomnography (PSG) was used to compare sleep-wake behavior before and after intervention. Results After the intervention, the numbers of awakenings, awakenings greater than 5 min, micro awakenings, NREM micro awakenings, micro awakenings in phase 1, micro awakenings in phase 2, and REM awakenings were decreased in both groups (P<0.05). The degree of reduction of those parameters were greater and the proportion of total sleep time to recording time was longer in the study group than in the control group (P<0.05). Conclusion Music therapy based on mindfulness can effectively improve the sleep-wakeful behavior of ASD patients with cerebral hemorrhage, change the sleep process, and improve their sleep quality.
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Photoautotrophic cultivation with heterotrophic cells as seeds (heterotrophic cells/photoautotrophic cultivation) is an effective way for the development of microalgal biofuel, but its development potential from the point of process optimization has not been investigated in literatures. To evaluate this, the optimizations of medium and culture conditions for Chlorella ellipsoidea were studied. In the heterotrophic stage, the biomass concentration reached 11.04 g/L with the optimized medium in flask, which were 28.0% higher than that with the original medium, and the biomass concentration reached 73.89 g/L in 5-L fermenter. In the photoautotrophic stage, the culture medium and conditions were studied in a 2-L column photobioreactor. The maximum biomass concentration, lipid content and lipid productivity reached 1.62 g/L, 36.34% and 6.1 mg/(L·h) under the optimal photoautotrophic conditions. The lipids were mainly composed of C16-C18 fatty acids, which were raw material suitable for biodiesel. After optimization, heterotrophic cells/photoautotrophic cultivation can significantly improve the capacity of biofuel production by Chlorella ellipsoidea, this method is also expected to be an efficient way for the cultivation of other microalgae that can grow heterotrophically.
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Biofuels , Biomass , Cell Culture Techniques , Chlorella , Metabolism , Culture Media , Fatty Acids , Heterotrophic Processes , Lipids , PhotobioreactorsABSTRACT
As a new type of carbon nanomaterials, fluorescent carbon dots (fluorescent CDs) have many advantages when compared with the traditional fluorescent probes. They are photoluminescence stable and resistance to photo bleaching. Moreover, they are excellent in biocompatibility, low-toxic and easy to modify. All these above make them a promising optical image material as a probe in optical image. This article reviews structure, the common carbon sources, the preparation methods, and the light-emitting principles of the carbon dots. We also introduce the research progress of fluorescent carbon dots in biomedicine, and the problems need to be resolved in the study of fluorescent CDs.
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Objective To explore the outcome of monoclonal gammopathy of undetermined significance (MGUS). Methods The data from 14 MGUS patients in our hospital including clinical features, outcome and change of M protein concentration were analyzed retrospectively. Results The MGUS didn't have the clinical manifestations of multiple myeloma (MM), the time of outcome from MGUS to MM was about 4-20 years (mean time, 10 years). The most types of MM were IgA and IgG, 6 cases were IgA type, 6 cases were IgG type and 2 cases were light chain type. The concentration of immune globulin in general showed an upward trend year by year. A few showed fold lines ascend. Conclusions The elevated monoclonal immunoglobulin may develop into MM after many years. We must follow up frequently to avoid error diagnosis and missed diagnosis.
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With the dwindling of fossil fuels supply and the urgent need for the development of low-carbon economy, microalgae bioenergy, both renewable and environmentally friendly, has become one of the worldwide focuses. Given its benefit to the security of national energy supply, microalgae energy is particularly significant for China, with more than 50% crude oil imported and limited arable land for grain and edible oil production. In this article, both the advantages of microalgae bioenergy and the challenges of its development are addressed, which involves fundamental research and technology development as well as commercial production. Furthermore, strategies are proposed for China's microalgae bioenergy development, and its prospects are projected.
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Biofuels , Biotechnology , Methods , Conservation of Energy Resources , Methods , Microalgae , MetabolismABSTRACT
Objective To provide an anatomic evidence for the double-bundle posterior cruciate ligament (PCL) reconstruction, the sizes and locations of the attachments of the PCL to the tibia and the femur were measured. Methods We studied 30 cadaveric knees. PCLs were divided into anterolateral and posteromedial bundles to the insertion footprint, and those locations were measured and described. Results The distances from the center of the femoral insertions of the anterolateral and posteromedial bundles to the anterior margin of the medial femoral condyle were (8.52±1.81)mm and (11.63±1.81)mm. The vertical distances from the center of the femoral insertions of the double-bundle to the intercondylar roof were (4.67±0.55)mm and (10.32±1.23) mm. The vertical distances from the tibial insertion of the center of the double-bundle to the plane of the tibial articular surface were (8.43±1.21)mm and (14.52±2.31)mm. The distances from the medial margin of the articular cartilage of the tibial plateau to the center of the tibial insertions of double-bundle were (47.44±6.23)mm and (45.95±6.32)mm. The areas of the insertions of the anterolateral and posteromedial bundles on the femur were (107.12±15.25)mm~2 and (65.35±10.27)mm~2. The areas of the insertions of the double-bundle on the tibia were (50.07±11.33)mm~2and (51.08±10.22)mm~2. Conclusion The anatomic characteristic of the attachment of the anterolateral and posteromedial bundles was revealed, providing anatomical bases for surgery.
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Objective To explore the isometry of grafts in PCL(posterior cruciate ligament)double-bundle re-construction under femoral tunnel shifting condition.Method Knee specimens from ten fresh frozen cadavers were used.PCL were divided into anterolateral bundles(ALB)and posteromedial bundles(PMB)to the inser-tion footorint.The anterior,postedor,proximal,distal and central points of the two bundles'femoral attachment site were respectivelyanchored to the middle of the PCL's tibial attachment site by the trial wires.Changes in length of the intra-articular part of the wires were recorded while the knee was flexed from 0°to 120°.Result The length changes in every point were compared.All of the maximal length changes of ALB's proximal,pos-todor points and PMB's proximal points were not greater than 2mm.No significant difference between the length changes of ALB's proximal point and posterior(P=0.864>0.05)was found.Conclusions The femo-ral tunnel for the PCL double-bundle reconstruction should be located as follows:ALB should be at the middle point of upper edge of femoral attachment site(proximal point),while PIVIB at the middle point of femoral attachment site(proximal point).
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AIM: To determine the mycoplasma infection and the drug resistance in outpatients with NGU. METHODS: Mycoplasma culture, identification and drug sensitivity assay were carried out with samples of 472 NGU patients by using one complex mycoplasma kit. RESULTS: 153 in 472 cases showed mycoplasma positive. The total positive rate was 32.4%. The positive cases of Uu, Mh and mixed both infection were 112( 23.7%), 11( 2.3%), and 30( 6.4%), respectively. The female positive rate was found significantly higher than that of male (? 2= 4.157,P
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ObjectiveThe aim of this study was to evaluate the measurement of plasma D-dimer level in the diagnosis of acute and chronic deep venous thrombosis(DVT) of the lower limbs. Methods Gold colloids immunofiltration assay(GIA) was used to detect D-dimer in the plasma in 121 patients with DVT of the lower limbs confirmed by continuous wave Dopper ultrasound and B-mode ultrasound (normal value