Determination of abamectin residues in fruits and vegetables by high-performance liquid chromatography.

A rapid and sensitive HPLC method has been developed and validated for the determination of abamectin residues (avermectin B1a and B1b, as well as the metabolite 8,9-Z-avermectin B1) in apples, pears and tomatoes. Residues are extracted with acetonitrile. The diluted extract is cleaned up on a C18 solid-phase extraction cartridge.

Simplified extraction and cleanup for multiresidue determination of pesticides in lanolin.

In the proposed method, a light petroleum solution of lanolin (wool fat) is adsorbed on diatomaceous earth in an Extrelut column, and the pesticides are eluted with acetonitrile saturated with light petroleum. After evaporation to a small volume, the extract is subjected to solid-phase extraction (SPE) on a C-18 column. The acetonitrile eluate is evaporated to dryness and the residue is taken up in light petroleum.

Crystals occurring in pulmonary cytology specimens. Association with Aspergillus infection.

Birefringent needlelike crystals in rosette or wheat-sheaf-like arrangements were found in pulmonary cytology specimens from 11 of 65 patients who had either sputum cultures positive for Aspergillus or histologically confirmed pulmonary aspergilloma. No crystals were found in specimens from 60 control patients with and without known fungal disease. The crystals were most often associated with A.

Superinfected actinomycotic abscess of the liver.

Isolated actinomycotic liver abscess is rare. We report a case with fulminant evolution, which was treated successfully with surgery and penicillin. In human actinomycosis, Actinomyces israeli is the main infective agent.

Chronic pancreatic pleural effusions and ascites.

The occurrence of pleural effusion or ascites, secondary to internal pancreatic fistula, is a rare clinical syndrome and diagnosis is, therefore, often missed. The fluid accumulation has been attributed to disruption of the pancreatic duct or to rupture of a pseudocyst. In a 20 year period, 106 patients were hospitalized in the department of surgery, CHUV, with a diagnosis of chronic or chronic relapsing pancreatitis, and 77 with that of pancreatic pseudocyst.

A long-term study of different types of experimental alkaline reflux and the effects of its suppression in dogs.

The gastric mucosa of 19 mongrel dogs was submitted to a bilio-pancreatic, isolated biliary or isolated pancreatic reflux. With an isolated biliary reflux, there is a more rapid and more severe hyperaemia and foveolar hyperplasia of the mucosa of the fundus than with an isolated pancreatic reflux. There was no significant change in the basal serum level of gastrin with any of these different types of alkaline reflux, but we observed a statistically significant increase in the level of histamine in the gastric mucosa.

Modifications of the gastric mucosal barrier induced by experimental duodenogastric reflux: an electron microscopy study.

The present study was undertaken to examine the ultrastructure of antral foveolar epithelium of dogs submitted to long term duodenogastric reflux. Minimal ultrastructural alterations (swelling of the cellular organelles, shortening of the microvilli, irregularity of the secretory granules) were observed. Total necrosis of isolated cells was rare.

A long-term study of experimental duodenogastric reflux on the vagotomized stomach in dogs.

The possibility has been explored in dogs that the effects of chronic enteral reflux on the gastric mucosa may be modified by highly selective vagotomy (HSV). In both the innervated and the vagotomized stomachs, Roux-en-Y duodenogastrostomy induced mucosal hyperaemia and foveolar hyperplasia; the mucosa regained normal morphology after the elimination of reflux. Duodenogastrostomy without HSV did not influence basal serum gastrin but resulted in a significant increase in mucosal histamine.

The gastric mucosa in experimental duodenogastric reflux. A scanning electron microscope study.

In the course of a long-lasting experiment on entero-gastric reflux in the dog, we examined with the SEM the gastric mucosal surface epithelium in 22 animals chronically exposed to any type of enteral diversion to the stomach, associated in one group to a highly selective vagotomy. Tissue samples were collected at the time of corrective surgery and at sacrifice in the survivors. The control group was composed of 4 dogs with Roux-en-Y loops.

Endoscopic noninvasive manometry of esophageal varices: prognostic significance.

Our study attempts to establish a relation between the pressure in the esophageal varices and the clinical outcome in 18 patients in whom sclerotherapy for bleeding esophageal varices was performed. The measured pressure was compared to the endoscopic findings. Before sclerotherapy, a noninvasive manometric measurement was performed on the varices using a spheric membrane manometer fixed at the tip of an endoscope.

[Gallbladder duplication and accessory gallbladders].

Double gallbladders represent a large spectrum of malformations; on an embryological base these anomalies are divided into true duplications and accessory gallbladders according to whether both cystic ducts are fused or separated to join the common bile duct. The authors have observed four cases one of which is discussed for diagnostic and therapeutic considerations.

[4 cases of potassium enteropathy].

The oral use of enteric-coated potassium chloride (and apparently of its slow-release form too) to compensate potassium loss during thiazide diuretic treatment may engender ischemic enteropathy. This iatrogenic condition is linked to the vaso-active properties of KCl, which act on blood vessels often damaged by hypertension or chronic heart failure. Four observations are presented involving stenosing ulceration or perforation of the small bowel following oral KCl treatment.