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A patient with perforated appendicitis developed progressive vasodilatory shock which was complicated by perioperative acute myocardial infarction. Cardiovascular support included dopamine infusion, and later, intra-aortic balloon counterpulsation balloon pump and noradrenaline and dobutamine infusion. Vasopressin was introduced as a final attempt to reverse the refractory shock and was associated with recovery. The experience with this case suggests that vasopressin may be a valuable adjunct to the treatment of catecholamine-resistant vasodilatory shock.

Isolation and nitrogenase activity of Burkholderia vietnamiensis, a nitrogen-fixing bacterium associated with rice (Oryza sativa L) on a sulphate acid soil of Vietnam. To study the dominant diazotrophs associated with rice in Vietnam, young rice plants were grown on a Vietnamese sulphate acid soil in a phytotron; under these conditions, a maximum nitrogenase activity (estimated with acetylene reduction activity technique) of ca 360 nmol C2H4h-1plant-1, was measured on day 8. At this stage, N2-fixing bacteria were counted and isolated, using the 'spermosphere model' technique, in which exudates of an aseptically grown rice plantlet are the only C source for bacteria. The contribution of N2-fixing bacteria to the microflora (total bacteria, 6.5 x 108colony forming units g-1soil) was shown to be close to 40% in the initial rhizosphere soil. Twelve representative isolates were further studied and proved to be Burkholderia vietnamiensis. They exhibited a low pH-adapted nitrogenase activity. Four of them were selected for comparison with six other strains of Azospirillum lipoferum, A brasilense and Enterobacter cloacae for their nitrogenase activities in the presence of axenically grown rice plantlets. Strain TVV75 of B vietnamiensis was more efficient (1 900 nmol C2H4tube-1day-1) than the others, with the exception of strain MRB16 of A lipoferum (from Bangladesh). Consequently, strain TVV75 of B vietnamiensis has been retained for subsequent inoculation trials in Vietnam where yield increases were obtained. L'?tude de la microflore bact?rienne fixatrice d'azote dominante associ?e au riz a ?t? men?e sur un sol sulfat? acide du Vi?t-Nam. Une premi?re exp?rience a montr? que l'activit? nitrog?nasique (estim?e par mesure de l'activit? r?ductrice d'ac?tyl?ne) du syst?me sol-plante intact ?tait maximale apr?s huit jours de croissance, en chambre climatis?e (360 nmoles de C2H4h-1plante-1). Dans une deuxi?me exp?rience, le comptage et l'isolement des bact?ries fixatrices d'azote les plus abondantes de la rhizosph?re apr?s 8 jours de culture, ont ?t? r?alis?s ? l'aide du mod?le spermosph?re. Dans ce syst?me les exsudats d'une plante ax?nique de riz constituent l'unique source de carbone pour la croissance des bact?ries. Le peuplement des bact?ries fixatrices d'azote a ?t? ?valu? dans le sol de d?part ? 40 % de la microflore totale cultivable qui atteint 6,5 108UFC (unit?s formant colonies) par gramme de sol sec. Douze souches fixatrices parmi les plus abondantes ont ?t? particuli?rement ?tudi?es. Ces souches appartiennent ? la nouvelle esp?ce Burkholderia vietnamiensis. Elles ont une fixation d'azote adapt?e aux bas pH. Le mod?le spermosph?re a ?t? utilis? pour comparer l'activit? nitrog?nasique de quatre isolats de B vietnamiensis et de six souches de collection appartenant aux genres Azospirillum et Enterobacter, isol?es d'autres sols. La souche B vietnamiensis TVV75 s'est av?r?e plus efficiente que toutes les autres souches test?es (1 900 nmoles de C2H4tube-1jour-1) exception faite de la souche MRB16 d'A lipoferum (isol?e au Bangladesh). La souche TVV75 de B vietnamiensis avait ?t? retenue sur ce crit?re pour inoculer le riz au Vi?t-nam dans des essais montrant des augmentations de r?colte.

Recent uniaxial compression experiments on FCC metallic micro-crystals revealed their unique deformation behaviour as compared to the bulk situation. The distinctive behaviour includes size-dependent proof strength, intermittent plasticity during loading and creep, low steady-state creep rate, heterogeneous slip, limited dislocation accumulation, etc. This paper reviews the key experimental observations as well as modelling efforts for the underlying mechanisms.

The dioxadiphosphetane (II) is synthesized from the diazaphospholidine derivative (I).