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Biomedical subjects

S U Rehman

Publications and source records attributed to S U Rehman.

16 recordsLinked to original sources
PubMed2002

Sampling methods as abundance indices for adult Diaprepes abbreviatus (Coleoptera: Curculionidae) in citrus.

Beat sampling and two type of traps, cup traps and Tedders traps, were evaluated as sampling methods to detect and estimate population densities of adult Diaprepes abbreviatus L. weevils newly colonizing young citrus trees. The study was conducted over a 65-wk period across a 0.25-ha area of 80 citrus trees [Citrus sinensis (L.) Osbeck] (1.2-1.5 m tall). Beat samples were taken weekly to determine the number of trees infested and number of new adult weevils per tree. Sixteen of the 80 trees studied were each monitored weekly using one of the following trapping methods: cup traps in trees, cup traps on a stake in the ground within the tree drip line, cup traps on a stake in the ground outside of the drip line, Tedders traps on the ground within the drip line, and Tedders traps on the ground outside of the drip line. Weevils collected each week from trees and traps were removed from the study site. Based on the coefficients associated with Taylor's power law, the optimum numbers of trees to sample for an SEM equal to 25% of the mean estimate decreased from 50 trees at a mean of 0.5 new weevils per tree to 30 trees at a mean of 0.8 new weevils per tree. A significant relationship was found between the weekly mean number of new weevils per tree and the proportion of trees infested, a binomial relationship that could be further explored in the search for a sampling program for adult D. abbreviatus. Regression analyses indicated that three of the trapping methods served at least as weak indices of the presence and abundance of new weevils: cup traps in trees, Tedders traps inside the dripline and Tedders traps outside the dripline. Cup traps in trees and Tedders traps inside the dripline captured the most weevils and most frequently detected weevils. Although relatively inefficient as abundance indices of populations of new weevils, these two trapping methods appeared to have some value with respect to signaling when weevils first appeared in trees during the spring.

Animals↗
PubMed2001

Microbiological and biochemical characteristics of Canestrato Pugliese cheese made from raw milk, pasteurized milk or by heating the curd in hot whey.

Canestrato Pugliese cheeses were produced from raw ewes' milk (R and R(II) cheeses), pasteurized ewes' milk (P cheese) and by heating the curd in hot whey according to a traditional protocol (T cheese). R(II) differed from R cheese mainly by having been produced from raw milk with a higher number of somatic cells, 950.000 vs. 750.000 ml(-1), respectively. Compared to P and T cheeses, R and R(II) cheeses had a higher concentration (one or two orders of magnitude) of cheese-related bacteria such as adventitious mesophilic lactobacilli, enterococci and staphylococci. At the end of ripening, all cheeses contained less than 1.0 log cfu g(-1) of total and fecal coliforms, and Escherichia coli and Staphylococcus aureus were not detected. As shown by phenotypic identification and RAPD-PCR, R cheese contained the largest number of mesophilic lactobacilli species and the greatest diversity of strains within the Lactobacillus plantarum species. Primary proteolysis did not differ appreciably among the cheeses. On the contrary, both urea-PAGE and the RP-HPLC analyses of the water-soluble N fractions showed the more complex profiles in cheeses produced by raw milks. R and R(II) cheeses had the highest values of water-soluble N/total N (ca. 30%) and the highest concentration of total free amino acids (ca. 40 mg g(-1) which approached or exceeded those reported for Italian cheeses with very high level of proteolysis during ripening. The main differences between R-R(II) and P-T cheeses were the concentrations of aspartic acid, proline, alanine, isoleucine, histidine and lysine. The water-soluble extracts of R and R(II) cheeses contained levels of amino-, imino- and di-peptidase activities, which were about twice those found in P and T cheeses. Cheeses differed slightly in the concentration of total free fatty acids that ranged between 1673 and 1651 mg kg(-1) in R and R(II) cheeses, and 1397 and 1334 mg kg(-1) in P and T cheeses. Butyric, caproic, capric, palmitic, oleic and linoleic acids were found at the highest concentrations.

Animals↗
PubMed2000

Diaphragmatic rupture: A complication of violent cough.

The cough is a complex physiologic response designed to protect airways from unwanted secretions and foreign materials. Violent and paroxysmal coughs are associated with many complications. In this article, we will discuss a patient who sustained diaphragmatic rupture as a result of violent coughing. The possible mechanisms of this rare complication are explained.

Cough↗
PubMed1999

Intradialytic serial vascular access flow measurements.

Hemodialysis vascular access failure represents a major source of morbidity and mortality in chronic hemodialysis (CHD) patients. Serial vascular access blood flow (VABF) measurements are being used as a screening method at an increasing rate. There are limited data on the changes in VABF throughout the hemodialysis session, which may potentially affect the validity of VABF measurement. This study is performed to evaluate the trend in VABF during a given hemodialysis session by serial VABF measurements, along with potential factors that may affect VABF. Thirty-two CHD patients had serial VABF measurements performed during a hemodialysis session. Each patient had three serial VABF measurements during a hemodiaysis treatment (within 30, 90, and 150 minutes from the start of hemodialysis). Mean arterial blood pressure (MAP), ultrafiltration rate, and patient symptoms were recorded simultaneously. The mean VABF was 1,344 +/- 486 mL/min within 30 minutes of hemodialysis and decreased to 1,308 +/- 532 and 1,250 +/- 552 mL/min after 90 and 150 minutes, respectively. This trend was statistically significant (P = 0.03). There was a strong correlation between VABF measurements and MAP, which was more pronounced after 90 minutes of initiation of hemodialysis (r = 0.68; P < 0.001). Using multivariate analysis, it can be predicted that after 90 minutes of hemodialysis, each 10% decrease in MAP would result in an expected decrease of 8% in VABF. There was no effect of type of vascular access, baseline VABF, or amount of ultrafiltration on VABF changes. In conclusion, VABF measurements can be performed up to 2 to 2(1/2) hours from the start of hemodialysis in the majority of patients. The major determinant of VABF changes is MAP. In a subset of patients with a decrease MAP greater than 15%, it is advisable to perform VABF measurement either at the first 90 minutes of hemodialysis or postpone it to another treatment session, when MAP is more stable.

Adult↗
PubMed1998

Reversible dementia due to dural arteriovenous fistula: a simple surgical option.

Dural AVMs can produce a wide variety of symptoms related to raised intracranial pressure, venous congestion, and cerebral ischaemia. We present a unique case of reversible dementia, due to venous hypertension. The cerebral ischaemia was caused by extensive bilateral arteriovenous malformations of the external carotid system, which drained into the superior sagittal and transverse sinuses and resulted in venous hypertension. Although partial occlusion by endovascular embolization and ligation procedures had some effect, only 'scalping and silastic implantation' gave satisfactory amelioration of symptoms.

Aged↗
PubMed1992

Traumatic extradural hematoma of delayed onset is not a rarity.

During a 4.5-year period, 73 patients with traumatic extradural hematoma (EDH) were admitted to the neurosurgical unit of the same hospital and managed with surgical evacuation. Of these consecutive admissions, 22 patients with delayed EDH are reported. The incidence of this condition (30%; 22 of 73) contrasts with reports in the literature of 0 to 10%. This may be related to the availability of computed tomography and its liberal and early use in all head injuries. The overall mortality of traumatic EDH (5%; 4 of 73) was related to cases of delayed onset EDH. In addition to a high index of suspicion, early diagnosis of delayed EDH can be facilitated by liberal use of intracranial pressure monitoring and serial computed tomography.

Adult↗
PubMed1982

Zinc, copper and lead levels in blood, spinal cord and different parts of the brain in rabbit: effect of zinc-intoxication.

The effect of zinc (8 mg/kg body weight, intraperitoneally) administration daily for 7 consecutive days was studied on the levels of Zn++, Cu++ and Pb++ in the blood, spinal cord and different regions of the brain in rabbits. It was found that with increase in Zn++ concentration there was a decrease in copper levels and an increase in lead levels in almost all parts of the brain. In the blood, both copper and lead levels were significantly decreased. No definite mechanism for the changes can be postulated. The study suggests that changes of Zn++ concentration beyond physiological limits can affect the concentration of other essential and non-essential metal ions.

Animals↗
PubMedDate not supplied

Hepatic resection at a community hospital.

Hepatic resection remains the "gold standard" in the primary management of primary and metastatic tumors to the liver. Advanced surgical techniques along with more modern and sophisticated equipment have led to an increasing number of hepatic resections being performed with a concomitant decrease in morbidity and mortality. We followed prospectively 18 consecutive hepatic resections performed over a period of approximately 2.5 years. The setting was a community teaching hospital with a low volume of referrals for hepatic resection. Sixteen (88%) had metastatic disease and two had primary liver disease. There were four trisegmentectomies, four lobectomies, four segmentectomies, and six large wedge re-sections. Average estimated blood loss was 608 ml. Seven patients required transfusions. Complications occurred in five patients (27%). In-hospital mortality was 0%. Our experience suggests that liver resections in a low-volume community hospital can be performed safely provided an experienced surgical team with familiarity of advanced surgical techniques and sophisticated equipment used in hepatic resection is readily available.

Adult↗