Microhabitat associations and seedling bank dynamics in a neotropical forest

We conducted a rigorous test of tropical tree seedling microhabitat differentiation by examining microhabitat associations, survival and growth of established seedlings of ten tropical tree species representing a four-factor gradient in seed size. Eight microhabitat variables describing soil and light conditions were measured directly adjacent to each of 588 seedlings within twelve 10×100 m belt transects at Paracou, French Guiana, and at 264 reference points along the transects. From these measurements, we defined three principal components describing soil richness, soil softness and canopy openness. Six of ten species (in 9 of 30 total cases) were distributed non-randomly with respect to microhabitat along at least one principal component. However, few species demonstrated clear microhabitat specialization. All shifts in distribution relative to reference points were in the same direction (richer, softer soil). Furthermore, of 135 pairwise comparisons among the species, only 7 were significantly different. More than three-fourths of all seedlings (75.3%) survived over the 2-year monitoring period, but survival rates varied widely among species. In no case was the probability of survival influenced by any microhabitat parameter. Relative height growth rates for the seedlings over 2 years varied from −0.031 cm cm −1  year −1 ( Dicorynia guianensis , Caesalpiniaceae) to 0.088 cm cm −1  year −1 ( Virola michelii , Myristicaceae). In only 4 of 30 cases was height growth significantly associated with one of the three principal components. Because the conditions in this study were designed to maximize the chance of finding microhabitat differentiation among a group of species differing greatly in life history traits, the lack of microhabitat specialization it uncovered suggests that microhabitat partitioning among tropical tree species at the established seedling stage is unlikely to contribute greatly to coexistence among these species.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47708/1/442_2004_Article_1691.pd

Clinical and Proctosigmoidoscopic findings in Patients with Anorectal Sepsis in a Private Health Facility in Lagos, Nigeria

Background: Anorectal sepsis is a distressing condition which is sometimes inadequately treated.Objectives: To determine the clinical and prostosigmoidoscopic findings in patients with anorectal sepsis seen by the authors over a 5 year period as well as identifying the commonly performed procedures.Method: A review of all the records of patients seen by the authors over a 5 year period was carried out. The demographic pattern was determined including the age, sex, mode of presentation, and associated co-morbidities. The detailed perianal and protosigmoidoscopic findings were also notedResults: 45 males and 10 females were seen during the study period. The mean age incidence was 43.4 years. The commonest mode of presentation was perianal discharge and pain in over 85% of the patients seen. The low anal fistula was the commonest pathology on proctosigmoidoscopy while abscesses and external haemorrhoids were the other commonly occurring lesions found. Fistulotomy was the most commonly perfomed procedure while diabetes was the most common comorbidity.Conclusion: Anorectal sepsis most commonly affects males in the fifth decade of life. Thorough evaluation and adequate operative treatment appear to result in satisfactory early outcome.KeyWords: Anorectal sepsis, fistula in ano, proctosigmoidoscop

Feasibility of Early Diagnosis and Treatment of Acute Chest Syndrome in Sickle Cell Anaemia- A Case Report

Acute chest syndrome is a serious complication and one of the causes of mortality in sickle cell disease. Twenty eight year old male was admitted in our hospital with fever, severe chest pain and haemolytic crisis. He was treated with intravenous antibiotics, fluids, parenteral analgesics and blood transfusion. Severe hypoxemia developed after 72 hours of hospitalization. The patient was transferred to the intensive care unit of our hospital. Oxygen therapy and ionotropic support were initiated. Vital parameters and organ functions returned to normal after treatment.KEYWORDS: Acute chest syndrome, Sickle cell anaemi

Can renal oncocytoma be distinguished from chromophobe renal cell carcinoma by the presence of fibrous capsule?

The most important differential diagnosis of chromophobe renal cell carcinoma (CRCC) is renal oncocytoma. Due to overlapping morphological characteristics of renal oncocytoma and CRCC, particularly its eosinophilic variant, making a correct diagnosis can be challenging. To date, no data are available on the presence of the tumor fibrous capsule as a diagnostic feature in differentiating these tumors. The main purpose of this study was to establish the presence and compare the thickness of the tumor fibrous capsule between two tumor groups. A total of 37 tumors--18 cases of CRCC (three eosinophilic and 15 classic) and 19 cases of renal oncocytoma--were analyzed. Four slides of each tumor stained with hematoxylin and eosin were first scanned at low-power magnification (x40) to assess the presence of the capsule. If present, the capsule was measured in three different thickest areas at higher magnification (x200). The mean value of capsule thickness was calculated and taken into consideration. The capsule was present in 12 (66.7%) cases of CRCCs and in only two (10.5%) cases of renal oncocytomas. Statistical analysis showed significant difference between the presence of fibrous capsule in these two observed tumor groups (P = 0.001). Average thickness of capsule in CRCCs was 337.7 microm, and 115.4 microm in renal oncocytomas, but the median was not statistically significant (P = 0.198). Studies with a larger number of cases are needed to conclude if this characteristic could be a low-cost, reliable microscopic feature in differentiating between CRCC and renal oncocytoma