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- Abstract：To investigate the relationship between expression of PTEN and VEGF and clinicopathological features in ca-nine mammary gland tumor,the expression levels of PTEN and VEGF protein were assessed in32cases of canine mam-mary gland tumors tissues and6cases of normal mammary gland tissues using SP immunohistochemical method.The over-expression rate of PTEN protein was100% in normal and well-differentiated mammary gland tissues and67% in breast cancer cases respectively with a significant difference between the two groups(P<0.01).Expression of PTEN was not related to age and tumor size,but closely correlated with lymph node metastasis(P< 0.01).The over-ex-pression rate of VEGF protein was33.3% in normal mammary gland tissues,and78% in canine mammary gland tumors with a significant difference between the two groups(P<0.01).Expression of VEGF was not related to age or tumor size,but closely correlated with lymph node metastasis and clinical stage(P<0.05).Therefore,the combined detec-tion of PTEN and VEGF could serve as an important index to estimate the biological behavior and prognosis of canine mammary gland tumors.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The changes in distribution and number of acetylcholinesterase(AchE) and nitric oxide synthase(NOS) posi-tive neurons were studied in enteric nervous system of goat small intestine at15days,4months and12months of age using by using histochemistry.The results showed that1) a lot of AchE-positive neurons were observed in submucosa and myenteric plexuses.These neurons gathered in ganglia and formed a net.2) The NOS-positive neurons were main-ly located in the myentrric plexus,but very few NOS-positive neurons were observed in the submucou plexus.3) In myentrric plexus,the total number of AchE and NOS positive neurons was increased163% and137% in12months of age than that of15days of age,respectively.However,the neuron density decreased by39%(AchE) and40%(NOS) in12months of age comparing with that of15days of age.4) The total numbers of AchE and NOS positive neu-rons were the largest in the jejunum,whereas the neuron density was the highest in the ileum,compared with that in other sections of small intestine.In addituion,the number of cholinergic neurons was more than those of NO neurons in the submucou plexus.In the duration of small intestine development,the increase in the cholinergic and NO neurons was accompanied by the decline of NO neuron,while the density.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The objective of this study was to investigate effects of magnesium on susceptibility of erythrocyte toin vitro oxidative stress and membrane fluidity in broiler chickens.Ninety six-1day-old male Abor Acre broiler chicks were ran-domly allocated into low-magnesium and control groups,each group had6replicates of8male birds each,fed either control or low magnesium diets containing about1.2g/kg or2.4g/kg of diet respectively.The erythrocyte from low-magnesium group exhibited higher MDA production inin vitrooxidative stress reaction system than that from control(P<0.05).The anisotropy parameter of erythrocyte membranes was increased by low magnesium diet(P< 0.05).Glutathione(GSH) content of erythrocyte decreased by17%(P<0.05) while malondialdehyde(MDA) concentration increased by19% in low-magnesium group(P<0.05).Magnesium content of erythrocyte membrane from low-magne-sium group was reduced by14%(P<0.05).Feeding low-magnesium diet for21days resulted in a smaller but signifi-cant increase in cholesterol content of erythrocyte membrane(P< 0.05) and in higher cholesterol/phospholipids ratio(P<0.01).These results suggest that low magnesium diet impaired antioxidant capacity of erythrocyte and then in-creased susceptibility of erythrocyte toin vitrooxidative stress.Increased MDA content and altered cholesterol compo-sition of erythrocyte membrane should be contributing factors to the decrease of erythrocyte membrane fluidity.2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The effects of dietary L-carnitine and CoQ10supplementation on cardiomyocyte apoptosis were investigated in broil-ers with ascites.The factors included L-carnitine supplementation(100mg/kg feed),CoQ10supplementation(40mg/kg feed) and2temperature treatments.The results showed that CoQ10supplementation alone can significantly decrease packed cell volume(PCV) of36days old broilers(0.41vs.0.31)(P<0.05);L-carnitine supplementation alone can significantly de-crease ascites heart index(AHI) of42days old broilers(0.31vs.0.21)(P<0.05).Dietary L-carnitine and CoQ10supple-mentation alone and in combination significantly reduced the ascites mortality(P<0.05).A large amount of cytochrome C was released from cytosol only when H2O2was added to the cardiomyoctyes of normal broilers to induce apoptosis.The cytochrome C release was observed in cardiomyocytes of ascites broilers with or without H2O2.Caspase-3activity was not altered signifi-cantly among groups.L-carnitine and CoQ10supplementation alone and in combination can significantly increase the level of GSH in cardiomyocytes of ascites broilers as well as the anti-reactive oxygen capability(A-RC).There was insufficient evi-dence to enunciate the necessary relationship between ascites and cardiomyocyte apoptosis,but dietary L-carnitine and CoQ10 supplementation alone and in combination reduced ascites mortality of broilers.1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the relation of carbohydrate metabolism with the growth and development of gladiolus cormels,we monitored the changes of soluble sugar,sucrose,reduced sugar and amylase during cormel development of bothRose Supreme and Advanced Red.The results indicated that there were two stages of morphologization and ex-pansion during cormel development.The contents of soluble sugar,sucrose,reduced sugar and amylase were about 50,30,16mg/g,3mg/(g.min),and90,46,30mg/g,0.7mg/(g.min) at the two stages respectively.Carbohy-drate metabolism slowed down with withering.Both varieties of gladiolus had a similar pattern of carbohydrate metabolism although their courses of growth and development were different.It is therefore suggested that the level of carbohydrate metabolism is closely related with the growth and development of gladiolus cormels.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：An opener that can plant two rows of wheat and one row of fertilizer in one operation was developed to solve residue blockage problems of no-tillage planter in the area of two crops a year.At the same time this planter realizes planting wheat in different row width by machine.The experimental comparison of an ordinary narrow-point opener with the combined fertilizing-seeding opener operated at two seeding tube spaces of8cm and10cm,respectively,was made.Results showed that the wheat-planter with the combined fertilizing-seeding opener was better than the ordinary narrow-point one in passing ability on the same average row width;the variance coefficients of planting depth and row width were7.3% and5.6%,respectively,from the combined fertilizing-seeding opener with10cm seeding tube space that was the lowest one in three openers;the opener with8cm seeding tube space has the minimum variance coefficients of draught resistance and fertilizing depth,459.2N and3.5%,respectively.The experiments indicate that the optimized average row width is20cm in wide-narrow row planting.A no-tillage planter with the combined fertilizing-seeding opener could meet the requirements of agricultural technology and solve the residue blockage problems effec-tively.3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to compare the performances of a motor-knap-sprayer,which is a new plant protect machine in Chi-na,with two traditional handled-knap-sprayers,the volume distributions,the uniformities of pesticide droplet,the de-positions of pesticide and the body exposures of these three types of sprayers were experimentally studied in this work.The variation coefficient of volume distribution of the new machine is11.09%,and that of droplet deposit was 20.27%,which is6% less than that of the conventional machine.When the spray volumes are225L/hm2and300L/ hm2for the elongation rice,the chemical depositions are25.9% and27.4%,which are enhanced by7.8% and5.8%,respectively.However,the chemical depositions on body decreased by70% and50%,respectively,at that volume.With uniform distributions of droplet and high chemical deposition,the new machine is better for farmer used in small fields.1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to simulate the crop fruit and make the virtual crop environment more realistic, an approach for modeling the virtual crop fruit based on loop subdivision scheme is proposed. It creates models of fruit by constructing control mesh according to the features of the configuration of the fruit and defining proper subdivision rules. New rules are added to the existing ones to solve the problem of simulating non-smooth features of the fruit. The modeling of wheat fruit and corn fruit is realized by Java3D API. The experimental results show that this method used for modeling crop fruit gives a verisimilitude solution, which can meet the needs of a virtual crop environment.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the phenomena of current Telco service network system overload caused by service differences and strong burst,a technology of service gateway of the next generation network-Parlay and its overload control mecha-nisms are presented in this paper.A service overload control model based on service policy was established with con-sideration of operating features of a Parlay Gateway.Telco services were classified and modeled by QoS,and the overload control algorithm was analyzed in detail.Based on the simulation results,we concluded that the algorithm could be used for controlling system overload based on service policy effectively and faired.2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：An embedded terminator based on CAN bus-mastering system was developed for the control system in a greenhouse.A S3C2410microprocessor with an operating system of ARM-Linux was employed.The terminator could collect data from sensors and send commands manipulated by applications through the CAN bus port.The CAN-bus nodes include the I/O modules and the sensor modules to transmit data as well as to execute the control functions.The stabilization and the control functions of this system performed well in the experiment.The system was developed at a low cost and has a great potential application and extension after being industrialized.2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The stability and load-carrying ability of a tubular steel derrick are the main parameters determining the safe-ty of a steel derrick.A finite element computing model based on the non-linear beam element was built.The stability of the tubular steel derrick was computed by computer.Furthermore,some methods for strengthening the stability of a derrick were analyzed.Results indicated that the stability factor of whole derrick is only65% as that of the single pole;the height of the derrick,amount of the poling and the distance between the tie wall rods have significant effect on load-carrying ability of a tubular steel derrick.In practice,by increasing the number of tie wall rod and decreasing the dis-tance between rails will strengthen the stability and load-carrying ability of a tubular steel derrick,thus the working height of a derrick will be increased.0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
