Antibacterial effect of low-temperature plasma on Enterococcus faecalis in dentinal tubules in vitro / 北京大学学报(医学版)

OBJECTIVE@#To construct a model of Enterococcus faecalis (E. faecalis) infection in dentinal tubules by gradient centrifugation and to evaluate the antibacterial effect of low-temperature plasma on E. faecalis in dentinal tubules.@*METHODS@#Standard dentin blocks of 4 mm×4 mm×2 mm size were prepared from single root canal isolated teeth without caries, placed in the E. faecalis bacterial solution, centrifuged in gradient and incubated for 24 h to establish the model of dentinal tubule infection with E. faecalis. The twenty dentin blocks of were divided into five groups, low-temperature plasma jet treatment for 0, 5 and 10 min, calcium hydroxide paste sealing for 7 d and 2% chlorhexidine gel sealing for 7 d. Scanning electron microscopy and confocal laser scanning microscope were used to assess the infection in the dentinal tubules and the antibacterial effect of low-temperature plasma.@*RESULTS@#The results of scanning electron microscopy and confocal laser scanning microscopy showed that after 24 h of incubation by gradient centrifugation, E. faecalis could fully enter the dentinal tubules to a depth of more than 600μm indicating that this method was time-saving and efficient and could successfully construct a model of E. faecalis infection in dentinal tubules. Low-temperature plasma could enter the dentinal tubules and play a role, the structure of E. faecalis was still intact after 5 min of low-temperature plasma treatment, with no obvious damage, and after 10 min of low-temperature plasma treatment, the surface morphology of E. faecalis was crumpled and deformed, the cell wall was seriously collapsed, and the normal physiological morphology was damaged indicating that the majority of E. faecalis was killed in the dentinal tubules. The antibacterial effect of low-temperature plasma treatment for 10 min exceeded that of the calcium hydroxide paste sealing for 7 d and the 2% chlorhexidine gel sealing for 7 d. These two chemicals had difficulty entering deep into the dentinal tubules, and therefore only had a few of antibacterial effect on the bacterial biofilm on the root canal wall, and there was also no significant damage to the E. faecalis bacterial structure.@*CONCLUSION@#Gradient centrifugation could establish the model of E. faecalis dentin infection successfully. Low-temperature plasma treatment for 10 min could kill E. faecalis in dentinal tubules effectively, which is superior to the calcium hydroxide paste sealing for 7 d and the 2% chlorhexidine gel sealing for 7 d.

Correlation between adhesion molecules on the surface of red blood cell membrane and red blood cell lifespan / 中国输血杂志

【Objective】 To explore the correlation between red blood cell lifespan and adhesion molecules on the surface of red blood cell membrane, in order to establish a method to detect the duration of red blood cell storage. 【Methods】 10 samples(10 mL each) of fresh red blood cell, collectedf rom 10 healthy voluntary blood donors, were divided into 5 age groups (layers) by Percoll density gradient centrifugation. The expression of CD47, CD44 and CD147 on the surface of red blood cell membrane in each layer was detected using flow cytometry. The variance of protein expression in each layer of red blood cells was analyzed by SPSS statistical software. 【Results】 The expression levels (%) of 3 adhesion molecules on the surface of red blood cell membranes from young to old were CD47: 14.44±2.61, 9.30±1.75, 7.84±1.49, 6.54±1.32 and 5.53±1.12 (P<0.01); CD44: 25.01±1.94, 19.22±1.52, 17.10±1.28, 15.18±1.11 and 13.56±1.08 (P<0.01); CD147: 33.46±1.99, 28.31±2.95, 23.83±1.59, 20.40±1.56 and 18.03±1.65 (P<0.01). 【Conclusion】 The expression levels of CD47, CD44 and CD147 on the surface of red blood cell membranes have showed a downward trend as the storage extended. These three protein adhesion molecules have showed a correlation with red blood cells lifespan, and could be used as detection markers of cell age.

Extraction and identification of human stem cells from the apical papilla derived-exosomes / 上海交通大学学报（医学版）

Objective: To obtain and identify the exosomes derived from human stem cells from the apical papilla (hSCAPs). Methods: hSCAPs were cultured by modified tissue adherence method and the phenotypes were analyzed with stem cell surface markers CD105, CD45, CD44, CD31, CD34 and CD29. The capability of multi-differentiation in hSCAPs was identified by osteogenic and adipogenic differentiation in vitro. Exosomes were isolated from hSCAPs culture supernatants using gradient centrifugation methods. The size of vesicle was assessed by nanoparticle size analyzer. The morphology of exosomes was observed by transmission electronic microscope (TEM), and the expression of exosome molecular markers CD81, CD9, CD63 and TSG101 was analyzed by Western blotting. Results: hSCAPs were positive for the mesenchyme stem cell markers, including CD105, CD44 and CD29 and negative for the hematopoietic markers CD45, CD31 and CD34. hSCAPs could differentiate into osteoblasts and adipocytes. hSCAPs secreted microvesicles which exhibited round vesicle structure with an intact membrane observed by the TEM. The results of nanoparticle size analyzer measurement showed that the diameters of vesicles were ranged from 30 to 100 nm, which were consistent with the results by TEM. Microvesicles could express the molecular markers for exosomes, i.e. CD81, CD9, CD63 and TSG101. Conclusion: The microvesicles were successfully isolated from hSCAPs and identified as exosomes.

A new method for separation of human pancreatic stellate cells / 中华肝胆外科杂志

Objective To explore a new method for the separation of human pancreatic stellate cells.Methods Single-cell suspension of normal pancreatic tissue and pancreatic cancer tissue was prepared by gentle MACSTM tissue processor-constant temperature shaking digestion.Human pancreatic stellate cells of quiescent and activated state were isolated by density gradient centrifugation.Results A new type of isolation method could obtain about (2.6 ± 0.7) × 106 quiescent pancreatic stellate cells in 1 g of human normal pancreatic tissue,with a viability of about 90.0％.The morphology of the cells were conformed to the representative for the quiescent state characteristics and transient blue-green autofluorescence was observed at the 328 nm excitation wavelength;1 g of human pancreatic cancer was able to obtain approximately (4.1 ± 1.1) × 106 activated PSCs with a viability of 92.0％,and all of the activated cells expressed α-SMA vimentin,FSP-1 and other characteristic markers.Conclusions The new separation method of this experiment is suitable for both human resting and activated human pancreatic stellate cells.At the same time,the purity is high and the separation time is greatly shortened,which is worth promoting.

The effect of semen optimization on the rate of sperm DNA fragmentation and its effect on pregnancy out-come of IVF-ET / 实用医学杂志

Objective To investigate the method of effectively density gradient centrifugation combined with swim-up improves sperm nuclear integrity and determine whether the sperm chromatin dispersion test of sperm DNA fragmentation in raw or DGC-swim-up treated semen can influence the outcome of IVF. Method The DNA integrity of spermatozoa from 120 patients underwent IVF were analyzed by SCD before and after DGC and swim-up. The predictive value of the SDFI for IVF outcomes were assessed in a cohort of 100 patients who were underwent new embryo transfer. Result In male infertility group,DGC combined with swim-up decreased the SDFI from 22.75(14.44,30.25)to 11.50(5.60,22.79),while the control group decreased the SDFI from 20.86(15.00,26.81) to 7.50(3.63,15.44),respectively(P<0.05);SDFI after optimization in clinical pregnancy group was significantly lower than that of non-pregnant group. The area under the receiver operating characteristic curve was 0.667. The patients with low sperm DFI had a higher implantation rate and pregnancy rate compared with patients with high sperm DFI. Conclusions DGC and swim-up treated Sperm DNA fragmentation can predict the outcome of IVF. The effect of semen optimization on the rate of sperm DNA fragmentation is limited,once exceed,pregnancy rate and birth rate are decreased although fertilization is normal.

The effect of semen optimization on the rate of sperm DNA fragmentation and its effect on pregnancy out-come of IVF-ET / 实用医学杂志

Objective To investigate the method of effectively density gradient centrifugation combined with swim-up improves sperm nuclear integrity and determine whether the sperm chromatin dispersion test of sperm DNA fragmentation in raw or DGC-swim-up treated semen can influence the outcome of IVF. Method The DNA integrity of spermatozoa from 120 patients underwent IVF were analyzed by SCD before and after DGC and swim-up. The predictive value of the SDFI for IVF outcomes were assessed in a cohort of 100 patients who were underwent new embryo transfer. Result In male infertility group,DGC combined with swim-up decreased the SDFI from 22.75(14.44,30.25)to 11.50(5.60,22.79),while the control group decreased the SDFI from 20.86(15.00,26.81) to 7.50(3.63,15.44),respectively(P<0.05);SDFI after optimization in clinical pregnancy group was significantly lower than that of non-pregnant group. The area under the receiver operating characteristic curve was 0.667. The patients with low sperm DFI had a higher implantation rate and pregnancy rate compared with patients with high sperm DFI. Conclusions DGC and swim-up treated Sperm DNA fragmentation can predict the outcome of IVF. The effect of semen optimization on the rate of sperm DNA fragmentation is limited,once exceed,pregnancy rate and birth rate are decreased although fertilization is normal.

Sperm DNA fragmentation and sex chromosome aneuploidy after swim-up versus density gradient centrifugation / 대한생식의학회지

OBJECTIVE: The aim of this study was to compare the efficacy of swim-up and density gradient centrifugation (DGC) for reducing the amount of sperm with fragmented DNA, sex chromosome aneuploidy, and abnormal chromatin structure. METHODS: Semen samples were obtained from 18 healthy male partners who attended infertility clinics for infertility investigations and were processed with swim-up and DGC. The percentages of sperm cells with fragmented DNA measured by the sperm chromatin dispersion test, normal sex chromosomes assessed by fluorescence in situ hybridization, and abnormal chromatin structure identified by toluidine blue staining were examined. RESULTS: The percentage of sperm cells with fragmented DNA was significantly lower in the swim-up fraction (9.7%, p=0.001) than in the unprocessed fraction (27.0%), but not in the DGC fraction (27.8%, p=0.098). The percentage of sperm cells with normal X or Y chromosomes was comparable in the three fractions. The percentage of sperm cells with abnormal chromatin structure significantly decreased after DGC (from 15.7% to 10.3%, p=0.002). The swim-up method also tended to reduce the percentage of sperm cells with abnormal chromatin structure, but the difference was not significant (from 15.7% to 11.6%, p=0.316). CONCLUSION: The swim-up method is superior for enriching genetically competent sperm.

Progress in the isolation and purification methods of adipose-derived stem cells / 中国比较医学杂志

Adipose-derived stem cells ( ASCs ) as potential seeded cells have been widely used in tissue engineering.Thus to obtain enough, high activity, high purity adipose-derived stem cells is the particular important premise of the application in tissue engineering.In this paper, the isolation and purification methods of ASCs were reviewed and the merit and demerit of different methods were compared in order to provide theoretical basis for safe and high-effective isolation and purification of ASCs.

A comparative study of tumor-associated macrophages isolation in colorectal carcinoma by Ficoll-Hy-paque density gradient centrifugation and Percoll density gradient centrifugation / 实用医学杂志

Objective Percoll density gradient centrifugation and Ficoll-Hypaque density gradient cen-trifugation, which are frequently-used methods for separation of tumor-associated macrophages (TAMs) from solid carcinoma were compared, in order to find an effective way to separate TAMs from colorectal carcinoma (CRC). Furthermore, we studied the best adherence time of separating macrophage among mononuclear cells. Methods specimens were collected from CRC patients , after digesting into single cells , TAMs were separated from the same specimen by 100% Ficoll, 35% percoll and 25% combined with 65% percoll respectively. After these pre-liminary separation, the collected cells were purified a second time by adherence separation. The purity of TAMs were detected by immunofluorescence. Results TAMs purity from Ficoll-Hypaque density gradient centrifugation was 80.18%, statistically higher than that from Percoll density gradient centrifugations (54.33% and 10.93% re-spectively). Conclusion Compared to Percoll density gradient centrifugation, Ficoll-Hypaque density gradient centrifugation is a more effective and simple way to isolate TAMs from colorectal carcinoma , suggesting it can be wildly used in clinical and basic medical research. 2-4 hours is the best adherence time for isolating macrophage.

An optimized extraction protocol of prefrontal cortical and striatal synaptosomes from SHR rat / 中国比较医学杂志

Objective To introduce an improved extraction method of prefrontal cortical and striatal synaptosomes from SHR rat. Methods Synaptosomes were prepared from SHR rat brain tissue by Percoll density gradient centrifugation.Transmission electron microscopy was used to assess the morphology and structural integrity of the synaptosomes.Results The obtained synaptosomes showed oval structures surrounded by an intact membrane.Presynaptic components contained one or more mitochondria and a large number of synaptic vesicles.The synaptic clefts were clearly visible, and prominent part of the characteristic compact structure was clear, complete and with higher electron-density. The synaptosome presynaptic membrane, synaptic cleft, and postsynaptic membrane were well preserved, and the synaptosomes were densely distributed, showing typical morphological characteristics of synaptosomes.Conclusions The results of our study improved the traditional preparation method and provide a less time-consuming, highly productive protocol for preparation of structurally typical and intact synaptosomes, suitable for further research on neuroscience and neurological diseases.

Comparison of the effect of different media on the clinical outcomes of the density-gradient centrifugation/swim-up and swim-up methods / 대한생식의학회지

OBJECTIVE: Sperm must be properly prepared in in vitro fertilization (IVF)-embryo transfer (ET) programs in order to control the fertilization rate and ensure that embryos are of high quality and have appropriate developmental abilities. The objective of this study was to determine the most optimal sperm preparation method for IVF. METHODS: Patients less than 40 years of age who participated in a fresh IVF-ET cycle from November 2012 to March 2013 were included in this study. Poor responders with less than three mature oocytes were excluded. Ham's F-10 medium or sperm-washing medium (SWM) was used in combination with the density-gradient centrifugation/swim-up (DGC-SUP) or SUP methods for sperm preparation. A total of 429 fresh IVF-ET cycles were grouped according to the media and methods used for sperm preparation and retrospectively analyzed (DGC-SUP/Ham's F-10, n=82; DGC-SUP/SWM, n=43; SUP/Ham's F-10, n=181; SUP/SWM, n=123). RESULTS: There were no significant differences among these four groups with respect to the mean age of the female partners, duration of infertility, number of previous IVF cycles, and retrieved oocytes. We determined that both the DGC-SUP and SUP methods for sperm preparation from whole semen, using either Ham's F-10 or SWM media, result in comparable clinical outcomes, including fertilization and pregnancy rates. CONCLUSION: We suggest that both media and both methods for sperm preparation can be used for selecting high-quality sperm for assistive reproductive technology programs.

Detection and clinical significance of circulating tumor cells in pa-tients with gastric cancer / 中国肿瘤临床

Objective: To detect circulating tumor cells (CTCs) in patients with gastric cancer and evaluate the relationship among CTCs, clinico-pathological characteristics, and prognosis of gastric cancer. Methods: Peripheral blood samples (10 mL in EDTA) were obtained from 45 patients with gastric cancer. CTCs were detected using density-gradient centrifugation and immunofluo-rescence staining. The clinical significance of the two methods were also compared and investigated. Results:CTC-positive case was defined by the presence of at least one CK19 (+)-CTC per 10 mL of the sample. CTCs were found in 27 of the 45 patients with gastric cancer. The presence of CTCs was significantly correlated with lymph node metastasis, distant metastasis, and recurrence (P=0.007, 0.035, 0.035, respectively). However, CTCs were not significantly correlated with sex, age, tumor location, TNM staging, and tumor differentiation (P>0.05). Conclusion:CTCs were associated with poor prognosis of gastric cancer.

The comparison among extraction methods of exosomes from T cells of rats / 重庆医学

Objective The purification methods of the exosomes derived form T cells were established in order to get high quan-tity exosomes .Methods Exosomes from T cells culture supernatants were purified by ExoQuick Precipitation ,ultrafiltration and sucrose gradient centrifugation ,differential ultracentrifugation ,and confirmed via using transmission electron microscopy .The pro-tein expression of the exosomes were analyzed by SDS-PAGE electrophoresis .Western blotting was used to test the expression of IL-2 .Results The protein concentration of the exosomes purified through ExoQuick Precipitation ,ultrafiltration and sucrose gradi-ent centrifugation were higher than through differential ultracentrifugation (P<0 .05) .SDS-PAGE displayed the difference among the exosome purified by three methods .Three kinds of exosomes all expressed IL-2 .Conclusion ExoQuick Precipitation ,ultrafiltra-tion and sucrose gradient centrifugation technique can obtain high purity and complete exosome sample .

Assessment of swim-up and discontinuous density gradient in sperm sex preselection for bovine embryo production / Avaliação do swim-up e do gradiente descontinuo de densidade na pré-seleção do sexo de espermatozoides na produção de embriões bovinos

The purpose of this work was to associate the modified swim-up method with centrifugation in density gradient for the separation of X-bearing spermatozoa. Sperm viability and integrity were evaluated through the Trypan Blue/Giemsa staining method. Quality control of centrifuged spermatozoa was performed in in vitro produced embryos. The results were validated by the sex ratio of in vitro produced embryos using PCR by Y- specific sequences present in bovine male genomic DNA. After determining genetic sex of in vitro produced embryos, the results showed difference (P<0.05) in deviation of sex ratio when comparing the control group (45.2% females) with the other spermatozoa selection procedures (60.6% females) (P<0.05). The sperm selection methods are capable of selecting X-bearing spermatozoa without compromising the spermatozoa fertility (cleavage and blastocyst rates, 70% and 26%, respectively) and were considered relevant methods to be introduced in bovine in vitro produced embryo programs.

O objetivo do presente trabalho foi associar o método de swim-up modificado à centrifugação em gradiente de densidade para a separação de espermatozoides portadores do cromossomo X. A viabilidade e a integridade espermática foram avaliadas pelo método de coloração Azul de Tripan e Giemsa. O controle de qualidade dos espermatozoides centrifugados foi realizado por meio da produção in vitro de embriões bovinos. Os resultados foram validados pela técnica de PCR para verificar a proporção sexual dos embriões produzidos in vitro, com o uso de sequências Y especificas presente no DNA genômico de machos bovinos. Após determinar o sexo genético dos embriões produzidos in vitro, os resultados não mostraram diferença (P<0,05) no desvio da proporção do sexo quando comparou o grupo controle (45,2% de fêmeas) com os outros processos de seleção de espermatozoides (60,6% de fêmeas) (P<0,05). Os métodos de seleção de espermatozoides são capazes de selecionar espermatozoides portadores do cromossomo X sem comprometer a fertilidade, medida pelas taxas de clivagem e blastocisto de 70% e 26%, respectivamente, e foram considerados métodos de relevância para serem introduzidos nos programas de produção in vitro de embriões bovinos.

Subpopulation of Rabbit Articular Chondrocytes Separated by Percoll Density Gradient / 대한정형외과연구학회지

Articular chondrocytes have been known to have heterogeneity in articular cartilage. Four layers are generally recognized from the articular surface to the subchondral bone. We have used Percoll density gradients to separate chondrocytes from articular cartilage into distinct subpopulations. Non-fibrillated articular cartilage was obtained from rabbit knee. The cells were carefully layered on the top of the preformed gradient and spun. After centrifugation, we obtained four fractions: Fraction A referred boundary between 0% and 10%, fraction B from between 10% and 20%, fraction C from between 20% and 30%, and fraction D from between 40% and 50%. In the A fraction, cells are relatively larger and round in shape, while their nuclei are relatively smaller. In the cytoplasm many lipid droplets were found and rough endoplasmic reticulum were disrupted. In the D fraction, chondrocyte is small, with large nucleus which surrounded by well-developed rough endoplasmic reticulum. The type II collagen proteins were expressed strongly and more proteoglycans synthesized in fractions A and B. And chondrocytes from the fraction D divided more slowly than those from the fractions A, B, and C. We have succeeded in separating chondrocytes from articular cartilage into distinct subpopulations by Percoll density gradients, as well as characterized growth rate, histological appearances and phenotypic expression. This study is the first report about the Percoll density gradients to separate articular chondrocytes.

Improvement of Amplification Method for Cryptosporidium parvum Oocysts from Mice / 中国寄生虫学与寄生虫病杂志

Objective To establish a simplified amplification method for obtaining a large number of purified Cryptosporidium parvum oocysts from infected C57BL/6N mice. Methods All mice in the experimental groups were immunosuppressed by given different concentrations of dexamethasone phosphate added in drinking water throughout the experiment. The recovery and purity of the oocysts obtained using different purification methods was compared. The infectivity of the oocysts obtained from the same origin but different animals and different purification methods in a bovine fallopian tube epithelial cell culture system was studied. Results 4.16?10 9 oocysts were obtained in 30 mice in the 3rd group with dexamethasone of 20 ?g/ml in drinking water. No significant difference in the oocyst recovery, purity and infectivity was found between methods using saturated saline floatation and sucrose density gradient centrifugation. The infectivity of the oocysts obtained from the same origin but different animals was similar. Conclusion A simplified amplification method for obtaining a large number of purified Cryptosporidium parvum oocysts from the infected mice was established.

Human Sperm Morphology Comparison after Pre-and Post Percoll Gradient Centrifugation / 대한산부인과학회잡지

In order to assess the efficiency of Percoll gradient centrifugation(PGC) as a method of sperm selection, we have examined morphological characteristics of spermatozoa from 40 teratozoospermic patients attending the Infertility Clinic of Inchon Gil Gerneral Hospital. Patients were divided into three groups according to percentage normal morphology in the fresh sample : group A(n=5), 14% normal morphology. Morphology slides were perpared using Diff-Quik staining techniques and evaulated by Kruger strict criteria, under oil immersion at a magnification of X 1000, specific defects, head, neck and tail were assesed individualy. The results were as follows. 1. Following PGC, sperm samples with enhanced morphology were recovered for all groups. 2. For group A, PGC did not select a sample with significantly improved morphological characteristics. 3. Usually, sperm defects affected by PGC was head and neck. No significant difference was found for tail abnormality. In conclusion, Percoll gradient centrifugation is an efficient sperm preparation technique when the semen sample exhibits teratozoospermia, especially head or neck abnormality. However, in sample with < 5% normal form or tail abnormality, There is not significant improvement following PGC.

Purification of treponema pallidum from rabbit testicular tissue / 대한피부과학회지

There are several different methods of purifying Treponema pallidum(TP) from rabbit testicular tissue. Among them, we compared the use of differential centrifugation, which has been most widely used, to Percoll density gradient centrifugatian, a newly applied method, in purifying TP from rabbit testicular tissue by checking the protein concentration of the TP suspension, hemagglutination assay using sheep erythrocytes sensitized by TP, IgM-TP-enzyme-linked immunosorhent, assay(IgM-TP-ELISA) and eJect,ron microscopic observation. The protein concent,ration af TP antigen suspension (2x10(8)TP/ml) purified by Percoll density gradient centrifugation (lower band) was the lowest (129.0pg/ml) when compared to those purified by differential centrifugation (324.0pg/ml) and Percoll density gradient centrifugatian (upper band) (560.2pg/ml). Sheep erythrocytes sensitized by TP purified by Percoll density gradient centrifugation(lower band) showed the same resiilts as those using a commercii1 TPHA kit when tested with positive and negative control sera. The sensitivity and specificity of the IgM-TP-ELISA were 88.5%(23/26') and 86.4%(19/2Z) respectively using TP as an antigen purified by differential centrifugation. The rates were 96.29% (25/26) and 95.5%(2l/22) using TP purified by Percoll density gradient centrifugation. As shown by the electron microscopy, T. pizllida purified by clifferential centritugation and Percoll density gradient centrifugatiori were structurally unaltered, and Percoll-purified TP contained much less tissue debris than TP prepared by differ ential centrifugation. Therefor e, Percoll density gradient centrifugation is considered to be a better method of purifying TP from rabbit testicular tissue when compared to differential centrifugatian, as a matter of fact, Perrol1 density gradient centrifugation has been applieci successfully in the study of the physiology, recombinant DNA techniques, and antigenic structure of TP and to the preparation of the antigen for the FTA-ARS and TP-ELISA

Study on Methods for Isolation and Purification of Cryptosporidium parvum Oocysts from Mouse Feces / 中国寄生虫学与寄生虫病杂志

Objective To explore an applicable method for isolation and purification of Cryptosporidium parvum oocysts with high purity, recovery and vigor from mouse feces. Methods Four techniques were used for isolating and purifying C.parvum oocysts from mouse feces: modified saturated saline flotation, percoll gradient centrifugation, CsCl gradient centrifugation and the classical discontinuous sucrose gradient centrifugation. Oocysts received from the methods were used respectively to infect in vitro bovine fallopian tube epithelial cells (BFTE) and the development of the oocysts was examined under microscope after 48 h and 72 h cultivation. Results The number of oocysts received by the classical discontinuous sucrose gradient centrifugation [(2.86?0.08)?107] was significantly higher than that of percoll gradient centrifugation [(1.52?0.08)?107] (P0.05). Oocysts received from CsCl gradient centrifugation showed higher purity than those by discontinuous sucrose gradient centrifugation. Conclusion In comparison to the classical discontinuous sucrose gradient centrifugation, operation of the modified saturated saline flotation is easier and faster, and the purity of oocysts isolated by CsCl gradient centrifugation is higher.

IsoIation and 2-DE analysis of mitochondria of cultured hepatoma cells / 重庆医科大学学报

Objective:To make the isolation and 2-DE analysis of mitochondria,in order to prepare the following proteomic study on mitochondria of hepatoma-cell. Methods:Mitochondria was separated from cell homogenate by means of density gradient centrifugation,and 2-DE was conducted to examine the protein profile of mitochondrial preparations.Results:The increase in purity of mitochondria was found to be 12 times by density gradient centrifugation.Mitochondrial proteins were displayed well in the 2-DE pattern after purification.Conclusion:The isolation procedure is practicable,which provides a basis for the following proteomic study on mitochondria.