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Han XX, Li J, Sun RY, Li SH, Li J, Xu X. [Meta analysis of the prevalence and influencing factors of WMSDs among dentists in China]. Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi 2023; 41:358-363. [PMID: 37248082 DOI: 10.3760/cma.j.cn121094-20220801-00385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Objective: To explore the relevant factors of work-related musculoskeletal disorders (WMSDs) among dentists through Meta analysis, providing a basis for the prevention and control of WMSDs among dentists. Methods: In April 2022, cross-sectional research literatures on the prevalence correlation of WMSDs among Chinese dentists were searched in databases such as China National Knowledge Infrastructure, Wanfang, VIP, PubMed, Web of Science, and Em Base database. The search was conducted from the establishment of the database until April 2022, literatures were selected using keywords such as musculoskeletal disorders and dentists. To extract gender, age, length of service, disease classification and other related influencing factors as indicator, and prevalence was selected as the outcome indicator. After evaluating the quality of the literatures, RevMan 5.3 software was used to calculate the combined RD (95%CI) values of the included literatures. Results: A total of 15 articles were included, with a total sample size of 3646 people. Meta analysis results showed that the prevalence of WMSDs among dentists in China was 80%, and the top three parts of the incidence rates were 65% of the waist, 58% of the neck, and 50% of the back. Gender, age, length of service, region and disease classification all increased the risk of WMSDs, and the combined effect size were 75%, 78%, 71%, 77% and 82% respectively (P<0.05) . Conclusion: The occurrence of WMSDs among dentists in China is related to multiple factors such as gender, age, length of service and disease classification. The above risk factors should be taken into account in the workplace and preventive measures should be actively implemented to prolong the working life of dentists.
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Affiliation(s)
- X X Han
- Department of Stomatology, School of Stomatology, Weifang Medical College, Weifang 261053, China
| | - J Li
- Weifang People's Hospital Stomatological Clinic, Weifang 261000, China
| | - R Y Sun
- Department of Stomatology, School of Stomatology, Weifang Medical College, Weifang 261053, China
| | - S H Li
- Department of Stomatology, School of Stomatology, Weifang Medical College, Weifang 261053, China
| | - J Li
- Department of Preventive Medicine, School of Public Health, Weifang Medical College, Weifang 261053, China
| | - X Xu
- Department of Stomatology, School of Stomatology, Weifang Medical College, Weifang 261053, China
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Wang WN, Liang H, Wang AL, Chen T, Zhang SE, Sun RY. Effect of pH and Zn(2+) on subcultured muscle cells from Macrobrachium nipponense. Methods Cell Sci 2002; 22:277-84. [PMID: 11549940 DOI: 10.1023/a:1017962429862] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A cell culture system was devised for muscle cell of Macrobrachium nipponense in the study. The juvenile and adult shrimps were held in laboratory aquaria with penicillin 1000 IU/ml and streptomycin 1000 microg/ml for 12-24 hours. Cell cultures were established in medium 199 supplemented with 20% fetal bovine serum, 1 g/L glucose, 5.2 g/L NaCl, 1.43 g/L CaCl(2), 0.05 g/L MgCl(2), 100 IU/mL penicillin and 100 microg/ml streptomycin. Fibroblast-like cells were passaged up to three times and survived for 54 days. The results showed the optimum for subculture in vitro was in medium 199 with pH 7.6. Moreover, basal medium supplemented with Zn(2+) 60 microg/L could enhance the growth of the muscle cells. It was found that better results for cell culture would be obtained more easily with juvenile shrimps caught in spring than adults in summer or autumn; and shrimps caught within 12 hours after ecdysis could grow much better than the intermoult shrimps.
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Affiliation(s)
- W N Wang
- College of Life Sciences, Hebei University, 1. Hezuo Road, Boading, Hebei 071002, P. R. China.
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Zheng QS, Wang XW, Gui CQ, Sun RY. Quantitative design of optimal analgesic combination of acetaminophen, caffeine, and butalbital. Acta Pharmacol Sin 2001; 22:691-6. [PMID: 11749839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
AIM To quantitatively seek an optimal analgesic combination of acetaminophen (Ace), butalbital (Bul), and caffeine (Caf), and to characterize the pharmacodynamics of interaction among the three drugs. METHODS The models of acute inflammatory pain in carrageenin-injected rats were applied to measure the vocalization threshold to paw pressure. Six groups with different ratios and doses were set to seek an optimal combination of Ace, Caf, and Bul, analyzed by the weighted modification method. Based on the ratio and doses in the optimal combination, four continuous doses were set to analyze the interactions of therapeutic effects by the reflection method. The interaction of the acute toxicity was evaluated by the parameter method. RESULTS According to the degree of importance to the combined analgesic effect, Ace > Caf > Bul; Ace showed a significant dose-response relationship, whereas in Caf and Bul, this relationship was not apparent. A new combination was obtained by the theoretical analysis and confirmed further by experimentation. Namely, at a ratio of 8.6:1:1.5 Ace + Caf + Bul (240 + 28 + 42 mg/kg, ig) was an optimal combination. Both Caf and Bul had a synergism to Ace, but Caf was a stronger synergist in contrast to Bul. Such synergism increased the therapeutic effects in the range of Ace 153.6 - 300 mg/kg combined with Caf 17.9 - 35 mg/kg and Bul 26.8 -5 2.5 mg/kg (8.6:1:1.5). However, the dose of Ace + Caf + Bul at 300 + 35 + 52.5 mg/kg resulted in sedation in rats. The peak latency was approximately 1 h for all four continuous doses, but the peak amplitude was dose-related, and the duration of the therapeutic effect was less than 2 h. The acute toxicity of the three drugs in combination remained the same. CONCLUSION Ace + Caf + Bul at a dose of (240 + 28 + 42) mg/kg (ig) results in an optimal combination. The therapeutic window of the combination is located in the range of Ace (153.6 - 240 mg/kg)+Caf (17.9 - 28 mg/kg)+Bul (26.8 - 42 mg/kg) (8.6:1:1.5). Caf has a stronger synergism with Ace than Bul.
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Affiliation(s)
- Q S Zheng
- Laboratory of Structure Biology, School of Life Science, University of Science and Technology of China, Hefei 230021, China.
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Ma YM, Cheng NN, Li SP, Sun RY. [Effect of enterogastric circulation of diazepam on its CNS inhibitory action in mice]. Yao Xue Xue Bao 2001; 32:90-3. [PMID: 11243206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
The present study was designed to examine whether disturbance of the enterogastric circulation of diazepam would obviously affect its inhibitory action on CNS. Intragastric administration of acidic liquid (pH 1) elicited a marked increase in the amount of diazepam in the gastric juice of mice 1 h after i.v. diazepam, as measured by HPLC method. The effects of ig acidic charcoal (2 g.kg-1, pH 1), neutral charcoal and normal saline on diazepam-induced CNS depression were compared by studying the duration of hypnotic action, inhibition of spontaneous activity, dropping rate in rotating rod test and mortality after i.v. diazepam (10-40 mg.kg-1) in mice. The results showed that the animals receiving ig acidic charcoal recovered more rapidly from CNS depression and exhibited lower mortality than the animals in neutral charcoal group and normal saline group.
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Affiliation(s)
- Y M Ma
- Department of Pharmacology, Wannan Medical College, Wuhu 241001
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Zhou XQ, Sun RY, Niu CJ. [The effect of vitamin E on immune functions]. Sheng Li Ke Xue Jin Zhan 2000; 31:163-5. [PMID: 12545739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/28/2023]
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Zheng QS, Sun RY. Analysis of drug interactions in combined drug therapy by reflection method. Acta Pharmacol Sin 2000; 21:183-7. [PMID: 11263269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023] Open
Abstract
AIM To set up a new method to analyze multidrug interaction in combined drug therapy. METHODS Based on a dose-effect curve of the combined drugs and the equieffective test, a new mathematical model was set as Q = (Eo - Et)/L (-1 < Q < 1 addition, Q < or = 1 antagonism, Q > or = 1 synergism) where Eo = an observed value (or its fitted value) of combined effect, Et = an expected value of combined effect, and L = an equieffective cutoff between Eo and Et, decided by the equieffective criterion of a special field, the number of data points, and the experimental error. The different types of experimental data were analyzed by the new model. RESULTS This reflection method could deal with data in combined drug therapy, unnecessary to distinguish between independent and similar action, or exclusive and non-exclusive case among drugs. The number of drugs for combination did not need to be limited. But the experimental data should be enough to fit a dose-effect curve of drugs in combination. If every dose-effect curve of drugs for combination was made, a series of Q values was obtained from all levels of dose-effect for a systematic analysis. To large animal or human experiment, the points of dose-effect of each drug used alone could be reduced to even 1 point. The results of analysis took the criterion of a special field and laboratory error into account in this method. CONCLUSION The reflection method is an effective method for analysis of multidrug interaction in combined drug therapy.
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Affiliation(s)
- Q S Zheng
- Institute of Clinical Pharmacology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China.
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Zheng QS, Sun RY. Quantitative design of drug compatibility by weighted modification method. Zhongguo Yao Li Xue Bao 1999; 20:1043-51. [PMID: 11270973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
AIM To set up a new method for designing and quantitatively analyzing drug compatibility. METHODS Drugs for compatibility were divided into 6 dose levels which were evenly distributed to 6 compound groups according to a fixed design. A new mathematical model was set up to fit the dose-effect data of 6 groups. The coefficients, obtained from the model, reflected the dose-effect relationship and the important degree of every drug in combination. According to the coefficients, the drugs in compatibility could be distinguished into principal drug, synergist, inferior, antagonist, and assistant. Because compatibility in the maximal effect group was nearly (or was) an optimal one in 6 groups, the doses in the group were taken as a base for further modification which considered interaction among drugs. The results of the modification were demonstrated by further experiment. This method was applied to design and to quantitatively analyze the compatibility of allantoin, metronidazole, and dexamethasone sodium phosphate by 2 effect indices in mice. RESULTS This new method was able to effectively determine important degree of drugs in combination, and to optimize their doses for designing compatibility. CONCLUSION This weighted modification method is a highly efficient, accurate, and practical means for designing and quantitatively analyzing drug compatibility.
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Affiliation(s)
- Q S Zheng
- Institute of Clinical Pharmacology, Yijishan Hospital, Wannan Medical College, Wuhu 241001, China
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Liu XT, Lin QS, Li QF, Huang CX, Sun RY. Uncoupling protein mRNA, mitochondrial GTP-binding, and T4 5'-deiodinase activity of brown adipose tissue in Daurian ground squirrel during hibernation and arousal. Comp Biochem Physiol A Mol Integr Physiol 1998; 120:745-52. [PMID: 10400495 DOI: 10.1016/s1095-6433(98)10095-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The mRNA level of uncoupling protein (UCP) specific for brown adipose tissue (BAT) in Daurian ground squirrel, was detected by using a [32P]-labeled oligonucleotide probe. The UCP concentration in mitochondria was indirectly determined by titration with its specific ligand [H3]-labeled GTP. Type II T4 5'-deiodinase of BAT was assayed concomitantly. We found two species of mRNA for UCP with lengths of about 1.9 and 1.5 kb, respectively, both occurring in almost the same concentration. UCP mRNA content was elevated significantly during hibernation, but the UCP concentration did not change compared with that of nonhibernating controls kept at room temperature. When hibernating squirrels were aroused, the UCP mRNA remained at the elevated level as during hibernation, but the UCP concentration increased in comparison with that of nonhibernating controls or during hibernating. Changes in T4 5'-deiodinase activity in BAT were similar to the variations of the UCP mRNA level. These results suggest that the activation of T4 5'-deiodinase in BAT may be an important factor for the up-regulation and maintenance of UCP mRNA content needed for the synthesis of sufficient UCP to acquire the thermogenic capacity for arousal from hibernation.
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Affiliation(s)
- X T Liu
- Department of Biology, Beijing Normal University, People's Republic of China
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Zheng QS, Sun RY. Analysis of multidrug effects by parameter method. Zhongguo Yao Li Xue Bao 1998; 19:232-7. [PMID: 10375732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
AIM To set up a new analytic method for multidrug effects. METHODS Based on the principles of the target site kinetics and the equieffective test, a new mathematical model was set as Q = (Eo-Ee)/magnitude of Ee x W-sx x T (-1 < Q < 1 addition, Q < or = -1 antagonism, Q > or = 1 synergism) where Eo = a fitted value of the observed effect of a combination, Ee = an expected value of combined effect, W = an equieffective criterion decided by a special field, sx = a common standard error of Eo and Ee, and T = a value of one-sided t0.05. All the calculations were completed with computer. Dose-effect data from different types of experiments were fitted by the new model and the results were compared with those of other methods. RESULTS This parameter method dealt with different types of data well fitted with the Hill equation, and was not limited to analyze receptor interaction of drugs, or the number of combined drugs. A series of Q values was obtained from all levels of dose-effect for a systematic analysis. The analysis took the criterion of a special field and laboratory error into account. CONCLUSION This parameter method can effectively analyze the multidrug effects.
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Affiliation(s)
- Q S Zheng
- Institute of Clinical Pharmacology, Yijishan Hospital, Wannan Medical College, Wuhu, China
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Liu XT, LI QF, Huang CX, Sun RY. Effects of thyroid status on cold-adaptive thermogenesis in Brandt's vole, Microtus brandti. Physiol Zool 1997; 70:352-361. [PMID: 9231409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Hyper- and hypothyroidism were induced by subcutaneous injection of thyroxine and by oral administration of methimazol in Brandt's voles. The effects of the two treatments on metabolic thermogenesis at 25 degrees C and 4 degrees C were investigated. The level of resting metabolic rate was closely related to thyroid status: high in the hyperthyroid case and low in the hypothyroid case. However, no increase in resting metabolic rate occurred in either case during further cold acclimation. Hyperthyroidism resulted in an increased nonshivering thermogenesis, which was much enhanced by lower temperature, but hypothyroidism led to a suppressed nonshivering thermogenesis in the cold. The state-4 and state-3 respirations and the activities of cytochrome-c oxidase of liver mitochondria were elevated in hyperthyroid animals but attenuated in hypothyroid ones. However, these levels were scarcely changed after further cold acclimation. Both hyperthyroidism and cold acclimation induced the recruitment of brown adipose tissue, but brown adipose tissue was different biochemically in the two cases: in hyperthyroidism, the total protein was reduced, while fat content increased; in cold acclimation, the total and mitochondrial proteins were increased. However, in hypothyroid voles, the normal adaptive changes in brown adipose tissue were impaired in further cold acclimation. The activity of cytochromec oxidase in brown adipose tissue was increased by hyperthyroidism and enhanced in further cold. In contrast, its activity was inhibited in hypothyroid animals, though activated to some extent in cold. These results demonstrate that normal thyroid function is essential for the cold-induced increase of resting metabolic rate and nonshivering thermogenesis and that there is a synergism between thyroid hormone and cold acclimation in the regulation of nonshivering thermogenesis in Brandt's vole. In addition, the blunted response of brown adipocytes to the cold may be the cytological mechanism for the suppressed nonshivering thermogenesis found with hypothyroidism.
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Affiliation(s)
- X T Liu
- Department of Biology, Beijing Normal University, People's Republic of China
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Wang ZK, Li QF, Sun RY. [Thermoregulation mechanisms of brown adipose tissue]. Sheng Li Ke Xue Jin Zhan 1996; 27:353-5. [PMID: 9772391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Dai DZ, An LF, Huang DY, Sun RY. Orthogonal analysis of aggravating effects of alpha-, beta-agonists and leukocytes on reperfusion-induced arrhythmias and ventricular fibrillation in Langendorff's rat heart. Zhongguo Yao Li Xue Bao 1996; 17:145-8. [PMID: 9772665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
AIM To study the effect of leukocyte (Leu), alpha-agonist (alpha-Ago), and beta-agonist (beta-Ago) on the arrhythmias induced by ischemia and reperfusion to determine which of the 3 factors was the most important one in exacerbating arrhythmias. METHODS Arrhythmias were induced by the reduction and subsequent resumption of perfused flow in Langendorff's perfused rat hearts. Ventricular tachycardia (VT) and ventricular fibrillation (VF) were recorded on ECG, and the results were orthogonally analyzed. RESULTS When Leu was present, the incidence of VF induced by ischemia-reperfusion was 80%. The incidence in Leu-depleted hearts was 20%, alpha-Ago and beta-Ago elevated it to 60% and 100%, respectively. The results by orthogonal analysis demonstrated Leu or alpha-Ago+ beta-Ago increased VF incidence. With regard to arrhythmias, arrhythmia score was remarkedly increased by all of 3 factors and various combinations except beta-Ago + Leu. CONCLUSION Among these 3 factors, Leu was the most important one in facilitating reperfusion-induced arrhythmias.
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Affiliation(s)
- D Z Dai
- Research Division of Pharmacology, China Pharmaceutical University, Nanjing, China
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Ma YM, Sun RY. Second peak of plasma diazepam concentration and enterogastric circulation. Zhongguo Yao Li Xue Bao 1993; 14:218-21. [PMID: 8237395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Intragastric food administration caused a pronounced second peak of plasma diazepam concentration in rabbits after iv diazepam 5 mg.kg-1. The second peak disappeared after gastrostomy and choledochostomy. A large amount of diazepam was found in the gastric juice while its content in bile remained at a much lower level during the whole experiment. These results suggested that diazepam may undergo an enterogastric circulation in addition to its enterohepatic circulation, with the former mainly contributing to the appearance of the second peak.
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Affiliation(s)
- Y M Ma
- Department of Pharmacology, Wannan Medical College, Wuhu, China
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Sun RY. [Effect of activated leukocytes on pulmonary arterial pressure]. Zhonghua Jie He He Hu Xi Za Zhi 1991; 14:269-70, 318. [PMID: 1819376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Shock model was established by intravenous injection of E Coli endotoxin with a dosage of 5 mg/kg wt in dog. An immediate fall in systemic arterial pressure (SAP) was found after injection, while an increase in pulmonary arterial pressure (PAP) and a markedly leukopenia in circulatory blood were also found. Rats lung was perfused with warm (37 degrees C) krebs solution in constant flow rate. There was an obviously increase in PAP when activated leukocytes had been added to the perfusion solution. The results suggested that activated leukocytes in the lung blood vessels may play an important role in the pathogenesis of pulmonary hypertension.
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Affiliation(s)
- R Y Sun
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing
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Sun RY. [Site of endotoxic pulmonary vasoconstriction and the effect of anisodamine]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1989; 11:438-41. [PMID: 2534581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Using arterial and venous occlusion techniques in an in situ, isolated left goat lung preparation, the total arteriovenous pressure drop across the lung was partitioned vertically into pressure drops across the relatively indistensable arteries (delta Pa) and veins (delta Pv) and the middle distensible vessels (delta Pm). Endotoxin primarily increased delta Pv and Pc. Anisodamine only showed a slight effect on pressure drops in different segment under normal conditions. It could attenuate the endotoxin effect however. Serotonin mainly increased delta Pa and showed no effect on delta Pv and delta Pm. Norepinephrine and histamine increased delta Pv and Pc while it showed almost no effect on delta Pa. It is possible that the norepinephrine and histamine mediate the pulmonary hypertension caused by endotoxin.
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Sun RY, Yan YZ, Zhang H, Li CC. Role of beta-receptor in the radix Angelicae sinensis attenuated hypoxic pulmonary hypertension in rats. Chin Med J (Engl) 1989; 102:1-6. [PMID: 2569962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Acute pulmonary hypertension was caused by inhalation of 5% O2 in rats. Pulmonary vascular resistance (PVR) increased, but heart rate (HR), cardiac output (CO) and carotid arterial pressure (CAP) were not obviously changed. After an intravenous administration of Radix Angelicae sinensis, the acute pulmonary hypertension induced by inhalation of 5% O2 could be attenuated, but this effect disappeared if propranolol was given before Radix Angelicae sinensis. In chronic experiments, the same results were obtained, but the protective effect of Radix Angelicae sinensis on heart function was not influenced by propranolol. It is suggested that Radix Angelicae sinensis might play a role by stimulating the beta 2-receptor in the prevention of acute and chronic hypoxic pulmonary hypertension. However, prevention of hypertrophy of the right ventricle and enhancement of heart function in chronic hypoxic rats might not be attributed to the beta 1-receptor in the heart.
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Sun RY. [Effect of propranolol on attenuation of rat hypoxic pulmonary hypertension due to radix angelicae sinensis]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1988; 10:335-9. [PMID: 2855410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Sun RY. [Experimental study on the influence of radix Angelicae sinensis upon pulmonary circulation in rats]. Zhonghua Jie He He Hu Xi Za Zhi 1988; 11:163-6, 192. [PMID: 2851392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Sun RY. [The changes in the angiotensin-converting enzyme in patients with obliterative pulmonary hypertension]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1988; 10:36-9. [PMID: 2838190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Sun RY, Nieman GF, Hakim TS, Chang KK. [Effects of lung volume and alveolar surface tension on pulmonary vascular resistance]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1987; 9:439-4. [PMID: 2966007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
Utilizing the arterial and venous occlusion technique, the effects of lung inflation and deflation on the resistance of alveolar and extraalveolar vessels were measured in the dog in an isolated left lower lobe preparation. The lobe was inflated and deflated slowly (45 s) at constant speed. Two volumes at equal alveolar pressure (Palv = 9.9 +/- 0.6 mmHg) and two pressures (13.8 +/- 0.8 mmHg, inflation; 4.8 +/- 0.5 mmHg, deflation) at equal volumes during inflation and deflation were studied. The total vascular pressure drop was divided into three segments: arterial (delta Pa), middle (delta Pm), and venous (delta Pv). During inflation and deflation the changes in pulmonary arterial pressure were primarily due to changes in the resistance of the alveolar vessels. At equal Palv (9.9 mmHg), delta Pm was 10.3 +/- 1.2 mmHg during deflation compared with 6.8 +/- 1.1 mmHg during inflation. At equal lung volume, delta Pm was 10.2 +/- 1.5 mmHg during inflation (Palv = 13.8 mmHg) and 5.0 +/- 0.7 mmHg during deflation (Palv = 4.8 mmHg). These measurements suggest that the alveolar pressure was transmitted more effectively to the alveolar vessels during deflation due to a lower alveolar surface tension. It was estimated that at midlung volume, the perimicrovascular pressure was 3.5-3.8 mmHg greater during deflation than during inflation.
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Song JG, Sun RY. [Pharmacokinetics of double-bottle intravenous infusion]. Yao Xue Xue Bao 1983; 18:732-40. [PMID: 6677028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Guo HY, Sun RY, Xiao DM, Zhu GJ, Wang LR. [Hemodynamic patterns and certain humoral responses in dogs with endotoxin shock]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1982; 4:341-6. [PMID: 6303611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Guo HY, Sun RY. Experimental investigations on canine endotoxic shock: changes in hemodynamics and involvement of some humoral factors. Chin Med J (Engl) 1982; 95:613-21. [PMID: 6291873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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Sun RY. [Effects of anisodamine on pulmonary circulation and function of the dog in shock]. Zhonghua Yi Xue Za Zhi 1982; 62:458-60. [PMID: 6816425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Liu XJ, Yao MH, Fang TH, Song YY, Wu BY, Sun RY. [Some cardiovascular effects of cyclovirobuxine-D (author's transl)]. Zhongguo Yao Li Xue Bao 1982; 3:101-4. [PMID: 6214141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Sun RY, Guo HY, Yan YZ. [Correlation between changes in pulmonary rheography and pulmonary arterial pressure or pulmonary artery-left atrium pressure gradient (author's transl)]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1982; 4:40-4. [PMID: 6461431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Sun RY, Song JG. [Empirical formula for calculation of t value (author's transl)]. Zhonghua Yi Xue Za Zhi 1981; 61:426-7. [PMID: 6805905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Sun RY, Wang HX, Guo HY, Chen XY, Yan YZ. [Effect of Yiqi-Huoxue injections on acute pulmonary hypertension]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1981; 3 Suppl 1:17-22. [PMID: 6459872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Sun RY, Chen XY, Guo HY, Wang HX, Yan YZ. [A method for repeated measurements of canine pulmonary circulatory pressure]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1981; 3 Suppl 1:31-5. [PMID: 6459873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Abstract
Two squash methods, a quick examination method and a Feulgen stain method, were used to prepare specimens of apterous female aphids for examination of somatic chromosomes. In 50 species, chromosome counts varied through 2n numbers of 4, 6, 8, 10, 12, 14, 16, 18, and 20, with the greatest number of species (15) having 8 chromosomes. Diploid numbers are listed for all 50 species, and their possible value in the interpretation of the evolution, or in the systematics of, the Aphidoidea is discussed.
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