一类正规矩阵的反问题     

胡锡炎  周富照 《湖南农业大学学报(自然科学版)》1993,20(4)

In this paper, we consider the inverse problems for a kinds of normal matrices. Some necessary and sufficient conditions for existence of solution of these problems are given. The expression of the general solution is given.  相似文献   

Injection and sampling methods for drug residue study in calf muscle     

Y Takahashi  M Iida  Y Nishida  Y Kido 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1989,51(5):995-1001

Eight calves, weighing 50-150 kg, were given intramuscularly 5 ml of ampicillin (ABPC) aqueous suspensions (200 mg potency/ml) in their right and left gluteal and femoral regions. All calves were sacrificed one hour later to confirm the location of injected drug. The drug was found in a muscle layer when injected with a needle 15 mm long to the following positions, 1. the midpoint between the central position of the gluteal region (CG) and the tuber coxae (M-CTc), 2. the midpoint between CG and the tuber ossis ischii (M-CTo), 3. the central position of M. semimembranaceus in the femoral region (CF). Seven calves, weighing 130-150 kg, were given intramuscularly 5 ml of ABPC suspensions at M-CTo and CF and sacrificed one hour (4 calves) and 3 days (3 calves) later. ABPC diffused along the long axis of the muscle fibers but not to the radial direction. ABPC was detected only in the injected muscle layer even after 3 days indicating that the drug did not diffuse to the neighboring muscles. In the injected muscle layer, concentration of ABPC was remarkably different from part to part. From these results, sampling of the injected muscle for the drug residue study was proposed as follows: 1. isolate about 100 g of muscle just under the stick point marked on the skin considering the direction of drug diffusion, and 2. isolate separately about 200 g of the surrounding muscle to confirm if the sampling is appropriate.  相似文献   

两端不等弯矩作用下薄壁梁柱的弯扭屈曲     

周绪红  王世纪 《湖南农业大学学报(自然科学版)》1993,20(5)

本文采用Ｒａｙｌｅｉｇｈ－Ｒｉｔｚ法求解两端不等弯矩作用下单轴对称开口薄壁截面梁柱弯扭屈曲临界荷载，分析中考虑了三种常见的边界条件以及屈曲前变形的影响，将本文弯扭屈由临界荷载理论值与试验值比较，吻合较好。  相似文献   

Cellular injury and lipid peroxidation induced by hexavalent chromium in isolated rat hepatocytes   总被引：1，自引：0，他引：1  

S Ueno  N Susa  Y Furukawa  K Aikawa  I Itagaki 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1989,51(1):137-145

In order to elucidate the relationship between cellular injury and lipid peroxidation induced by hexavalent chromium (CrVI), isolated rat hepatocytes treated with any one of scavengers of active oxygen species, antioxidants or antichromium agent were incubated with K2Cr2O7 as CrVI (1 mM Cr). After the incubation, the development of lipid peroxidation was determined as thiobarbituric acid (TBA)-reacting materials in total lipid extracts from the incubated hepatocytes. Cellular injury was observed as a leakage of lactate dehydrogenase (LDH) from hepatocytes into incubation medium. The contents of reduced glutathione (GSH) in hepatocytes were also assessed. Results obtained were as follows: (1) CrVI facilitated lipid peroxidation in isolated hepatocytes after 20 min of incubation. On the other hand, the cellular injury induced by CrVI was barely observed even after 60 min of incubation. (2) The CrVI-induced lipid peroxidation was inhibited by catalase and mannitol as scavengers of active oxygen species, or N,N'-diphenyl-p-phenylenediamine and alpha-tocopherol as antioxidants. However the cytotoxicity of CrVI could not be prevented by these chemicals. (3) CrVI depleted the contents of intracellular GSH and diminished the activities of glutathione reductase (GR) and glutathione-S-transferase (GST) except glutathione peroxidase. (4) The scavengers of active oxygen species and the antioxidants could not prevent the depletion of intracellular GSH induced by CrVI. (6) Ascorbic acid, antichromium agent, prevented all of the lipid peroxidation, the cellular injury and intracellular GSH depletion induced by CrVI.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Distribution of Cytochrome P450-side Chain Cleavage in the Theca Interna Layers of Bovine Small Antral and Cystic Follicles   总被引：1，自引：0，他引：1  

N Isobe  T Nakao  Y Yoshimura 《Reproduction in domestic animals》2003,38(5):405-409

Cystic follicle is anovulatory follicular structure that is caused by an endocrine imbalance. The activity of cytochrome P450‐side chain cleavage (P450scc) is essential for the initiation of steroidogenesis in the follicle. The present study was designed to compare the frequency of cells containing P450scc between healthy and atretic small antral follicles, and among several types (I, II and III, classified based on the presence of granulosa layer) of cystic follicles. Paraffin sections of healthy (2–5 mm in diameter), atretic (2–5 mm) and cystic follicles (>25 mm) were immunohistochemically stained with rabbit polyclonal antibody to bovine P450scc. The P450scc‐positive cells were counted in four different regions of the follicles from the apical to the basal side. In small antral follicles and cystic follicles, P450scc‐positive cells were localized in the theca interna layers but not granulosa layers. The P450scc‐positive cell populations decreased in the late atretic follicles compared with the early and advanced atretic follicles at all the regions of follicle. Type III cystic follicles showed significantly lower frequencies of P450scc‐positive cells than those in the types I and II cystic follicles. These results suggest that in both small and cystic follicles in cows, total loss of granulosa cells may be associated with the reduction of frequency of P450scc‐positive cells in theca interna layer.  相似文献   

牛腔前卵泡的简易机械分离方法   总被引：9，自引：0，他引：9  

高志花  周虚  高庆华 《中国草食动物》2003,23(4):3-5

采用两种机械法分离牛腔前卵泡。方法一 (M -1) ,皮肤移植刀切割、剪碎、过滤镜下直接捡卵法。方法二 (M -2 ) ,皮质片剪碎、离心、悬浮、过滤镜下捡卵法。M -1平均每卵巢采卵数为 46 9个± 18 2个 ,M -2为 6 8 4个± 12 5个 ;处理时间M -1为 2 5 4min± 6 7min ,M -2为 46 3min± 16 8min ,两种方法采集腔前卵泡数量及处理时间均存在显著差异。平均每小时采集卵泡数分别为 99 5和 87 2个 ,M -1多于M -2。两种方法获得腔前卵泡大小分布规律也有明显差异 ,M -1采集腔前卵泡直径为 6 0～ 15 0 μm ,绝大部分是次级卵泡 ,而M -2获取腔前卵泡则偏小。总的看来 ,M -1处理时间短 ,回收效率高 ,方法简便 ,且分离卵泡直径较大 ,适于体外培养 ,是机械分离牛腔前卵泡的一种理想方法。  相似文献   

THE TREATMENT OF EXTREME CASES OF "SNIFFLES" IN THE RAT WITH SULFAPYRIDINE     

Billingslea FY 《Science (New York, N.Y.)》1940,91(2349):19

  相似文献   

Intra‐uterine Infection with Babesia bovis in a 2‐day‐old Calf     

I. Yeruham  Y. Avidar  I. Aroch  A. Hadani 《Zoonoses and public health》2003,50(2):60-62

Infection with Babesia bovis was diagnosed in a 2‐day‐old female calf apparently transmitted in utero. The calf was born as the second calving to a cross‐bred beef cow permanently on pasture. Diagnosis was based upon identification of B. bovis in peripheral blood smears and clinical signs which included fever, jaundice, pale mucous membranes and convulsions. Anaemia, leucocytosis, thrombocytopenia and lymphocytosis were noted at the febrile acute stage of the disease. The blood smears revealed evidence of regeneration of toxic neutrophils with a left shift, severe spherocytosis and high degree of basophilic stippling. Elevated concentration of aspartate aminotransferase, lactate dehydrogenase, and creatine kinase were also noted, and were probably the result of haemolysis, dehydration and muscle damage because of recumbancy. Elevated total bilirubin concentration following haemolysis resulted in jaundice. The neurological symptoms observed were probably caused by sludging of parasitized erythrocytes in the brain capillaries. The calf recovered following treatment with diminazene aceturate and the recovery was followed up clinically, haematologically and biochemically.  相似文献   

森林航空消防洒水扑火技术探讨     

周万书  陈宏刚  史磊 《森林防火》2009,(3):56-59

对航空洒水扑火机型、性能、洒水技术进行了介绍,并与地面用水扑救效果作了对比,指出了航空洒水扑火技术的方向.  相似文献   

新疆湿地保护管理学习考察体会     

冯宁  周灵国 《陕西林业》2009,(2):28-28

为提高我省湿地保护管理工作者的业务水平，应广大湿地保护管理人员的要求，根据省厅2008年工作计划的安排，组织了这次湿地保护管理考察学习。通过考察学习，使参与湿地保护管理的工作人员对湿地有了充分的认识，学习新疆林业厅在各湿地保护区工作中的经验，将学到的经验在陕西各地进行推广，推动湿地保护管理工作迈上新的台阶。  相似文献