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排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
AH Bosworth MK Williams KA Albrecht R Kwiatkowski J Beynon TR Hankinson CW Ronson F Cannon TJ Wacek EW Triplett 《Canadian Metallurgical Quarterly》1994,60(10):3815-3832
The construction of rhizobial strains which increase plant biomass under controlled conditions has been previously reported. However, there is no evidence that these newly constructed strains increase legume yield under agricultural conditions. This work tested the hypothesis that carefully manipulating expression of additional copies of nifA and dctABD in strains of Rhizobium meliloti would increase alfalfa yield in the field. The rationale for this hypothesis is based on the positive regulatory role that nifA plays in the expression of the nif regulon and the fact that a supply of dicarboxylic acids from the plant is required as a carbon and energy source for nitrogen fixation by the Rhizobium bacteroids in the nodule. These recombinant strains, as well as the wild-type strains from which they were derived, are ideal tools to examine the effects of modifying or increasing the expression of these genes on alfalfa biomass. The experimental design comprised seven recombinant strains, two wild-type strains, and an uninoculated control. Each treatment was replicated eight times and was conducted at four field sites in Wisconsin. Recombinant strain RMBPC-2, which has an additional copy of both nifA and dctABD, increased alfalfa biomass by 12.9% compared with the yield with the wild-type strain RMBPC and 17.9% over that in the uninoculated control plot at the site where soil nitrogen and organic matter content was lowest. These increases were statistically significant at the 5% confidence interval for each of the three harvests made during the growing season. Strain RMBPC-2 did increase alfalfa biomass at the Hancock site; however, no other significant increases or decreases in alfalfa biomass were observed with the seven other recombinant strains at that site. At three sites where this experiment was conducted, either native rhizobial populations or soil nitrogen concentrations were high. At these sites, none of the recombinant strains affected yield. We conclude that RMBPC -2 can increase alfalfa yields under field conditions of nitrogen limitation, low endogenous rhizobial competitors, and sufficient moisture. 相似文献
992.
F Buntinx HJ Schouten JA Knottnerus HF Crebolder GG Essed 《Canadian Metallurgical Quarterly》1993,46(4):367-370
The present study was carried out to investigate the biochemical and morphological changes in the liver after ligation of the hepatic artery (HA) in the presence and in the absence of extrahepatic cholestasis (EHC). The study was conducted on 100 rats divided into four groups of 25 animals each: group 1, sham operation; group 2, hepatic artery ligation (HAL); group 3, bile duct ligation (BDL); and group 4, HAL plus BDL. All animals were sacrificed 7 days after surgery when total bilirubin and fractions, alkaline phosphatase (AP), alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were measured in serum and on the inner hepatocyte mitochondrial membrane (IHMM); the incidence of necrosis and the volume fractions of vessels, bile ducts and hepatocytes in the liver were also determined. HAL reduces the relative volumes of bile ducts, with no changes in levels of bilirubin and fractions, AP, ALT, AST and IHMM, but HAL associated with EHC reduces duct proliferation and the liver becomes more vulnerable to necrosis. In conclusion, the normal liver depends on HA flow and this dependence is more evident in the presence of EHC. 相似文献
993.
Anmar W. Sabri Zainab H. Ali Serwan F. Shawkat Lamia A. Thejar Thaer I. Kassim Khalid A. Rasheed 《河流研究与利用》1993,8(3):237-250
The influences of the Samarra impoundment on the ecology of the downstream sector of the river Tigris are investigated. Zooplankton were collected monthly from July 1987 to July 1988. It was found that zooplankton were most abundant during high river discharges in March. During the month of low river discharge, September, the zooplankton population was greatly reduced immediately below the barrage and remained so to the last downstream station. Several factors seem to explain such differences. The high discharge from the impoundment was found to be the dominating factor and may flush the small backwaters in which zooplankton were abundant, thus increasing the population in the river. Zooplankton species vary in their ability to sustain populations in the river, variations which are due mainly to species-specific characteristics. 相似文献
994.
995.
One hundred and twenty-four patients over the age of 75 years were assessed for the cause of their macrocytosis (MCV > 95 fl). A definitive diagnosis was reached in 75/124 (60%) by non-invasive techniques. The remainder underwent a bone marrow biopsy yielding a definitive diagnosis in a further six patients who had an identifiable myelodysplastic syndrome (MDS). A high proportion of the remainder had morphological abnormalities which fitted with no recognized pathological entity. It is suggested that these may represent MDS in evolution. 相似文献
996.
G Flamini G Curigliano C Ratto A Astone G Ferretti P Nucera L Sofo A Sgambato A Boninsegna F Crucitti A Cittadini 《Canadian Metallurgical Quarterly》1996,24(5):802-806
Early reconstruction of the thumb carpometacarpal (CMC) joint after traumatic dislocation, when instability is present, may decrease the incidence of recurrent instability and post-traumatic joint degeneration. We report two retrospective cohort groups of patients who had sustained a traumatic thumb CMC joint dislocation. The first 8 patients, group A, were treated with closed reduction and pinning. Because the results were unsatisfactory with 4 patients, requiring revision surgery for recurrent instability in 3 and degenerative arthritis in 1, the treatment plan was changed to open reduction with a flexor carpi radialis weave, group B. The 9 patients in group B underwent early (an average of 7 days after injury) ligamentous reconstruction to decrease the incidence of joint damage from recurrent instability and improve long-term functional results. For patients in group B with a minimum follow-up period of 2 years, pain was not a major problem, and range of motion and grip strength were essentially preserved. The functional variables affected most in both groups were thumb abduction, which was decreased by 10%, and pinch strength, which was decreased by 13%, in group B, as compared to 20% and 19%, respectively, for the patients in group A. Radiographically, the joint space was slightly narrowed (Eaton stage II) in 3 cases in group B; however, these were asymptomatic. In group A, 5 patients demonstrated degenerative changes of the CMC joint (3 Eaton stage II, 2 stage III), and 3 patients were symptomatic after treatment. 相似文献
997.
MI Matee EF Lyamuya E Simon EC Mbena C Kagoma LP Samaranayake F Scheutz 《Canadian Metallurgical Quarterly》1996,73(5):292-294
The present study, based on 158 HIV seropositives and 167 HIV seronegatives, demonstrates that saliva collected with the Omni-SAL device and tested with GACELISA (an IgG antibody capture ELISA) is an effective non-invasive alternative to serum for anti-HIV IgG antibody screening. The study also shows that a conventional serum Western blot kit can be used, with slight modifications, for confirmatory testing of saliva specimens. Collecting saliva with the Omni-SAL device had a very good acceptance rate among Tanzanian subjects, and although this diagnostic method is not yet known by the general public, 65% of the study participants preferred to give saliva instead of blood for HIV testing. 相似文献
998.
In recent years the measurement of mold spore concentrations in working environments where workers spend long periods of time has acquired considerable importance because of the diffusion of diseases caused by fungi. On this basis, the aim of the research was to evaluate the level of environmental fungal pollution and contamination by mites in three factories producing seasoned foods, i.e., hams, sausages and cheeses. We also studied the occurrence of fungal species in the upper respiratory tract of workers operating in the washing and brushing areas, which was compared with the environmental concentrations in these areas, where contamination with fungal spores was visibly high. The results showed high and widespread fungal pollution in most of the working environments sampled and a significant presence of the same species in the upper respiratory tract of the workers. The data obtained indicate that the environments sampled can constitute a possible health risk factor for workers. 相似文献
999.
In this article, synchronous reluctance motors with multiple-segment rotor structures are considered. The presence of stator slots is taken into account, with respect to torque ripple. An analytical model is presented, based on magnetic interaction between the d and q axes, due to stator toothing. The effect of skewing is also considered, showing its partial effect on torque ripple reduction, due to the rotor anisotropy. A closed expression for the torque is obtained, giving the torque ripple as a function of design parameters. Experimental verification of the proposed model is given, from measurements on prototype motors 相似文献
1000.