The common nodulation genes of Astragalus sinicus rhizobia are conserved despite chromosomal diversity.

The nodulation genes of Mesorhizobium sp. (Astragalus sinicus) strain 7653R were cloned by functional complementation of Sinorhizobium meliloti nod mutants. The common nod genes, nodD, nodA, and nodBC, were identified by heterologous hybridization and sequence analysis. The nodA gene was found to be separated from nodBC by approximately 22 kb and was divergently transcribed. The 2. 0-kb nodDBC region was amplified by PCR from 24 rhizobial strains nodulating A. sinicus, which represented different chromosomal genotypes and geographic origins. No polymorphism was found in the size of PCR products, suggesting that the separation of nodA from nodBC is a common feature of A. sinicus rhizobia. Sequence analysis of the PCR-amplified nodA gene indicated that seven strains representing different 16S and 23S ribosomal DNA genotypes had identical nodA sequences. These data indicate that, whereas microsymbionts of A. sinicus exhibit chromosomal diversity, their nodulation genes are conserved, supporting the hypothesis of horizontal transfer of nod genes among diverse recipient bacteria.

Locally advanced (stage III and IV) head and neck cancer: Westmead Hospital experience.

Two hundred and fifty-one patients with Stage III and IV (UICC staging system) squamous cell cancers of the oral cavity, oropharynx, hypopharynx and larynx were assessed between January 1980 and December 1988 at Westmead Hospital. Of these, 50 patients received palliative treatment or were not treated and the remaining 201 patients received treatment with curative intent by various combinations of radiotherapy, surgery and chemotherapy. Thirty-nine operable cases were entered into a multimodality protocol initiated in April 1985, which consisted of induction chemotherapy (cisplatin 100 mg/m2 i.v. day 1, 5-fluorouracil 1000 mg/m2 per 24 h i.v. days 1-5, q3w x 2) followed by surgery and postoperative radiotherapy. The median follow-up for all 251 patients was 57 months. Actuarial 3-year survival rate for all 201 patients receiving radical treatment was 48% (Stage III 66%, Stage IV 36%; P less than 0.001). Overall actuarial local and nodal control rates at 3 years were 67% and 69%. Thirty-two of 201 patients (16%) developed distant metastases at a median time of 11 months. Twenty-one patients (10%) had a previous or subsequent second primary cancer. In the group of 39 protocol patients, overall actuarial survival, local and nodal control rates are 68%, 77% and 73% at 3 years. A group of 22 'protocol' patients was compared with a group of 22 patients treated prior to commencement of the protocol, matched as closely as possible on the basis of site, stage, age, sex and ECOG status.(ABSTRACT TRUNCATED AT 250 WORDS)

Neurotransmitter effects on body temperature are modified with increasing age.

This study reports effects on body temperature, in two different age groups of Sprague Dawley rats, of intracerebroventricular (ICV) administration of prostaglandin E2, noradrenaline, serotonin, dopamine, and carbachol. Young animals (3-5 months) developed fevers in response to administration of prostaglandin E2 (+ 1.02 +/- 0.26 degrees C), while no significant changes in colonic temperature were observed in the older (15-18 months) group of rats. Noradrenaline (10.0 micrograms), caused a decrease in colonic temperature in the younger group of animals (-2.02 +/- 0.70 degrees C), but had no significant effects on the body temperature of the older group. Similarly, differences between the temperature responses of the young as compared with the older group of animals were observed following ICV administration of carbachol, dopamine and serotonin. These data suggest that the roles of these substances in the hypothalamic control of body temperature may be modified with increasing age.

Cerasee, a traditional treatment for diabetes. Studies in normal and streptozotocin diabetic mice.

Cerasee, a wild variety of Momordica charantia is traditionally prepared as a tea for the treatment of diabetes mellitus in the West Indies and Central America. To investigate a possible hypoglycaemic effect, concentrated aqueous extracts of cerasee were administered to normal and streptozotocin diabetic mice. In normal mice, intraperitoneal administration of cerasee improved glucose tolerance after 8 hr, and in streptozotocin diabetic mice the level of hyperglycaemia was reduced by 50% after 5 hr. Chronic oral administration of cerasee to normal mice for 13 days improved glucose tolerance. The cerasee extracts did not significantly alter plasma insulin concentrations, suggesting that cerasee may exert an extrapancreatic effect to promote glucose disposal.