Evaluation of nitrogen fixation by bacteria in association with roots of tropical grasses

[This corrects the article on p. 494 in vol. 44.][This corrects the article on p. 496 in vol. 44.][This corrects the article on p. 498 in vol. 44.][This corrects the article on p. 499 in vol. 44.][This corrects the article on p. 503 in vol. 44.][This corrects the article on p. 506 in vol. 44.][This corrects the article on p. 507 in vol. 44.][This corrects the article on p. 512 in vol. 44.][This corrects the article on p. 513 in vol. 44.][This corrects the article on p. 517 in vol. 44.].     

Comparison of protein-synthesis rate of alveolar macrophages in vivo and in vitro.

This paper describes and validates a novel method for measuring rates of protein synthesis of rabbit alveolar macrophages in vivo. A rate of 9.3%/day was obtained, compared with 48.9%/day measured in vitro. This study suggests that the procedures involved in the isolation of alveolar macrophages for study in vitro may themselves activate the cell.     

厦门地区涉台引进园林植物的评价

本文回顾近十几年来厦门地区涉台("闽台通道")引进园林植物的概况,调查、总结和评价经"闽台通道"引入厦门地区栽培及应用的77种园林植物,并提出加强涉台园林植物引种工作的若干建议。     

The significance of peroxisomes in methanol metabolism in methylotrophic yeast

The capacity to use methanol as sole source of carbon and energy is restricted to relatively few yeast species. This may be related to the low efficiency of methanol metabolism in yeast, relative to that of prokaryotes. This contribution describes the details of methanol metabolism in yeast and focuses on the significance of compartmentalization of this metabolic pathway in peroxisomes.     

棉花离体培养纤维的研究进展

从试管棉纤维的诱导条件、影响试管棉纤维分化和伸长的因子以及其发育机制等方面进行了综述.试管棉纤维主要是通过胚珠及愈伤组织诱导形成,其影响因子主要是植物生长调节物质及外界环境.同时总结了目前棉花离体培养纤维中存在问题,并展望了棉花离体培养的前景和应用价值.     

棉花离体培养纤维的研究进展

从试管棉纤维的诱导条件、影响试管棉纤维分化和伸长的因子以及其发育机制等方面进行了综述。试管棉纤维主要是通过胚珠及愈伤组织诱导形成, 其影响因子主要是植物生长调节物质及外界环境。同时总结了目前棉花离体培养纤维中存在问题, 并展望了棉花离体培养的前景和应用价值。     

Rapid radiometric method for detection of salmonella in foods

[This corrects the article on p. 223 in vol. 40.][This corrects the article on p. 225 in vol. 40.][This corrects the article on p. 226 in vol. 40.][This corrects the article on p. 229 in vol. 40.].     

Age-dependent changes in the morphology of brown adipose tissue in mice.

The multocular fat cells of brown adipose tissue of the mouse show an age-dependent change to the unilocular fat cell type. This change starts immediately after birth and continues throughout life. This morphological change can be correlated with the animal's age-dependent decrease in tolerance to a cold environment.     

Experience in the application of Java Technologies in telemedicine

Java language has been demonstrated to be an effective tool in supporting medical image viewing in Russia. This evaluation was completed by obtaining a maximum of 20 images, depending on the client's computer workstation from one patient using a commercially available computer tomography (CT) scanner. The images were compared against standard CT images that were viewed at the site of capture. There was no appreciable difference. The client side is a lightweight component that provides an intuitive interface for end users. Each image is loaded in its own thread and the user can begin work after the first image has been loaded. This feature is especially useful on slow connection speed, 9.6 Kbps for example. The server side, which is implemented by the Java Servlet Engine works more effective than common gateway interface (CGI) programs do. Advantages of the Java Technology place this program on the next level of application development. This paper presents a unique application of Java in telemedicine.     

Role of cell wall of groundnut roots in solubilizing sparingly soluble phosphorus in soil

Groundnut showed a superior ability to take up P from a soil with low P fertility compared with sorghum and soybean. This ability was not related to its better root development or production of root exudates capable of solubilizing iron-and aluminum-bound P. In efforts to determine the role of roots per se, we found that root cell walls from groundnut showed a higher P-solubilizing activity than those from soybean or sorghum. This finding corresponds well with observations in field and pot experiments using a soil with low P availability. The reaction site of P-solubilizing activity is stable against heating and enzyme digestion by cellulase and pectinase. This is probably the first evidence to demonstrate that cell walls of plant roots are involved in P-solubilizing activity. ei]Section editor: H Marschner (deceased 21 September 1996)     

Demonstration of pectin-lyase in Bacillus subtilis

After a screening performed on pectinolytic micro-organisms, a strain of B. subtilis was isolated. This strain has a pectic enzyme capable of beta-elimination on highly methylated pectin (degree of esterification = 85%), without the action of a pectinesterase. This activity corresponds to that of a pectin-lyase.     

被子植物未受精胚珠与子房离体培养的研究进展

介绍被子植物未受精胚珠与子房离体培养诱导单倍体植株的研究进展。迄今已有9个科21种植物用这一方法诱导出单倍体植株,植物的基因型、外植体的发育程度、接种前的预处理、培养基和培养条件等均能影响诱导率的高低。胚胎学观察揭示大孢子与胚囊内的卵细胞、助细胞和反足细胞均有可能在培养中启动分裂,通过胚状体或愈伤组织形成单倍体植株。本项技术在植物单倍体育种中可发挥重要作用。     

Studies in the biology of metals

Conclusions Lead is absorbed by actively growing roots. This tissue is therefore permeable to the lead ion.The lead absorbed is in large part localized by deposition in the regions of growth by cell division. This suggests that the chemical conditions incident to mitosis produce substances in predominant degree which react with lead in a selective manner.     

Role of antibiosis in competition of erwinia strains in potato infection courts

[This corrects the article on p. 1225 in vol. 54.].     

Role of the epididymis in reabsorption of inhibin in the rat.

The effects of efferent duct ligation, orchidectomy and orchido-epididymectomy were compared at 36 h. This showed that the rat epididymis is capable of maintaining a negative feedback control of FSH secretion. Epididymal extracts contained a substance of tubular origin capable of reducing FSH secretion. This substance is a protein and is found in the caput region but not in the caudal region of the epididymis. A new role can be assigned to the head of the epididymis: that of reabsorbing, together with testis fluid, the inhibin produced by the seminiferous tubules, which thus passes into the bloodstream and provides a feedback regulation of plasma FSH.     

Detection of a new chloroperoxidase in Pseudomonas pyrrocinia

A new chloroperoxidase could be detected in Pseudomonas pyrrocinia ATCC 15,958, a bacterium that produces the antifungal antibiotic pyrrolnitrin. This enzyme was separated from a ferriprotoporphyrin IX containing bromoperoxidase which was also produced by this bacterium. The enzyme is capable of catalyzing the chorination of indole to 7-chloroindole. This procaryotic chloroperoxidase requires the presence of H2O2 and can also brominate monochlorodimedone, but cannot catalyze its chlorination. This enzyme is the first chloroperoxidase described from procaryotic sources.     

Variations in the effect of clonidine on arterial pressure in rats in the presence of various anesthetics]

The central hypotensive agent, clonidine (30 microgram/kg i.v.) has been injected in normotensive rats anesthetized with various agents. This dose of clonidine elicits usually a biphasic blood pressure response, i.e. a transient increase due to peripheral vasoconstriction, followed by a long lasting decrease. This has been observed in the animals anesthetized with pentobarbitone as well as with urethane. The hypotensive effect is abolished during chloralose, ketamine or Alfatésine anesthesia. These data emphasize that some anesthetics mays particularly modify the effects of centrally acting cardiovascular drugs.     

Orbital hydatid cyst of Echinococcus oligarthrus in a human in Venezuela

This study reports the first known case of human hydatid disease caused by the larval stage of Echinococcus oligarthrus. The patient, a native Venezuelan female, presented a single cyst localized intraorbitally behind the left eye (retroocular), which was discovered by computed tomography. The cyst was removed by surgery, and after parasitological studies it was identified as an E. oligarthrus hydatid cyst. This is also the first case of intraorbital hydatid cyst in humans in Venezuela.