广义对角占优矩阵的充分条件

给出了广义对角占优矩阵的若干充分条件，改进了文（1）的相应结果。     

用药的误区及其理论分析

使用药物是我们日常生活的一个重要部分。但是，人们对药物的使用普遍存在着误区，这些误区导致临床上产生许多药源性的疾病和不可逆的脏器损害。此文章通过对这些误区的分析，给人们正确、合理使用药物提供科学的理论依据。     

中华绒螯蟹Eriocheir sinensis幼体丝状细菌的扫描电镜观察

应用扫描电间对中华绒螯蟹幼体附着的丝状细菌进行了详细的观察，结果表明，丝状细菌只附生于幼体表面，没有明显伸入体内的结构，丝状细菌行裂殖生殖，生长繁殖所需营养直接摄取自水环境，并对其危害性以及防治等方面进行了探讨。     

红假单胞菌的分离及菌种保存试验研究

从不同来源的样品中分离出四株光合细菌 ,经鉴定均属于红假单胞菌 ,同时分别采用液体种自然条件下、液体种蜡封、穿刺物蜡封、砂土管等方法对其菌种进行了保存试验研究 ,最后得出两种最佳保存方法 :蜡封液体试管种法和试管穿刺蜡封法     

一株磷细菌发酵条件的研究

对一株磷细菌的发酵条件进行了研究。其中，单因素发酵试验表明，碳源以2％的淀粉最佳，氮源以0．1％的NH4CI最好。最适培养温度为37℃，最适初始pH为7．0，最佳振荡频率为200r/min，装液量为30／250mL，并进行了中试罐发酵分析，测定了罐发酵过程中的菌量、pH、还原糖及总氮的变化情况。     

光合细菌中类胡萝卜素的提取及性质的研究

确立了光合细菌ＰＳＢ－Ｈ 的最佳提取工艺条件为：以７∶２ 的丙酮－甲醇液为溶剂，用量２５ｍ Ｌ／４０ｍ Ｌ发酵液，２ ｈ，一次浸提，再经进一步的分离和纯化，得到类胡萝卜素纯品。并对提取后的类胡萝卜素的性质进行了进一步的探讨：具有双键烯烃的一般性质，耐热性较好，需置于暗处保存，在紫外防护试验中，当其质量浓度达到０．１ ｍ ｇ／Ｌ时，就有显著的防护作用     

Bacterial nonspecific acid phosphohydrolases: physiology, evolution and use as tools in microbial biotechnology

Bacterial nonspecific acid phosphohydrolases (NSAPs) are secreted enzymes, produced as soluble periplasmic proteins or as membrane-bound lipoproteins, that are usually able to dephosphorylate a broad array of structurally unrelated substrates and exhibit optimal catalytic activity at acidic to neutral pH values. Bacterial NSAPs are monomeric or oligomeric proteins containing polypeptide components with an M _r of 25 – 30 kDa. On the basis of amino acid sequence relatedness, three different molecular families of NSAPs can be distinguished, indicated as molecular class A, B and C, respectively. Members of each class share some common biophysical and functional features, but may also exhibit functional differences. NSAPs have been detected in several microbial taxa, and enzymes of different classes can be produced by the same bacterial species. Structural and phyletic relationships exist among the various bacterial NSAPs and some other bacterial and eucaryotic phosphohydrolases. Current knowledge on bacterial NSAPs is reviewed, together with analytical tools that may be useful for their characterization. An overview is also presented concerning the use of bacterial NSAPs in biotechnology. Received 21 November 1997; received after revision 10 March 1998; accepted 10 March 1998     

Preliminary observations of a bacteriophage infectingXenorhabdus luminescens (Enterobacteriaceae)

A bacteriophage infective toXenorhabdus luminescens, a bacterial symbiont of heterorhabditid nematodes, was recovered from insects that supported poor nematode development. Plaque tests showed the phage particles to be infective only to primary and not secondary colonies ofX. luminescens. The phage was not infective toX. nenatophilus primaries or secondaries. The bacteriophage particles ranged 80–90 nm in length, with the head ranging from 40 to 50 nm in diameter. Restriction analysis was performed on isolated bacteriophage DNA. This first report of a bacteriophage fromXenorhabdus species has pratical implications since it could be detrimental to cultures ofHeterorhabditis nematodes that are being produced throughout the world for the biological control of insects.     

关于矩阵共轭特征值的若干估计

给出了矩阵共轭特征值的Gerschgorin型估计式,得到了最小下界的某些估计.