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Papers by Mohammad Salehi

Research paper thumbnail of Fibroepithelial congenital polyp of prostatic urethra in an adult man

Urology journal, 2009

Received October 2008 Accepted February 2009 INTRODUCTION Fibroepithelial polyps (FEPs) of the ur... more Received October 2008 Accepted February 2009 INTRODUCTION Fibroepithelial polyps (FEPs) of the urethra are rare lesions in adults and are most frequently seen in men during the first decade of life.(1) These lesions are benign and congenital, usually discovered in infants and children, and have rarely been reported in adults.(2,3) Solitary polyps are called different names, such as prostatic urethral polyps, FEPs of the urethra, or benign urethral polyps.(4) Because of their location, as they achieve larger size, they can produce a variety of urinary symptoms including dysuria, hematuria, urinary tract infections, and obstructive symptoms, which may progress to urinary retention.(5) We report a case of benign FEP of the prostatic urethra in a 20-year-old man who presented with obstructive urinary symptoms and urinary retention.

Research paper thumbnail of Inverse Adaptive Cluster Sampling with Unequal Selection Probabilities: Case Studies on Crab Holes and Arsenic Pollution

Australian & New Zealand Journal of Statistics, 2015

Adaptive cluster sampling is an efficient method of estimating the parameters of rare and cluster... more Adaptive cluster sampling is an efficient method of estimating the parameters of rare and clustered populations. The method mimics how biologists would like to collect data in the field by targeting survey effort to localised areas where the rare population occurs. Another popular sampling design is inverse sampling. Inverse sampling was developed so as to be able to obtain a sample of rare events having a predetermined size. Ideally, in inverse sampling, the resultant sample set will be sufficiently large to ensure reliable estimation of population parameters. In an effort to combine the good properties of these two designs, adaptive cluster sampling and inverse sampling, we introduce inverse adaptive cluster sampling with unequal selection probabilities. We develop an unbiased estimator of the population total that is applicable to data obtained from such designs. We also develop numerical approximations to this estimator. The efficiency of the estimators that we introduce is investigated through simulation studies based on two real populations: crabs in Al Khor, Qatar and arsenic pollution in Kurdistan, Iran. The simulation results show that our estimators are efficient.

Research paper thumbnail of Design and synthesis of Raman reporter molecules for tissue imaging by immuno-SERS microscopy

Journal of biophotonics, 2011

The design and synthesis of Raman reporter molecules comprising olefin or alkyne moieties with st... more The design and synthesis of Raman reporter molecules comprising olefin or alkyne moieties with strong and characteristic vibrational Raman bands is presented. Chemisorption onto the surface of colloidal Au/Ag shells yields a self-assembled monolayer. Hydrophilic stabilization of such SERS labels can be achieved by short terminal ethylene glycol units attached to the Raman reporter. Encapsulation by silica with subsequent functionalization of the glass surface allows the conjugation to biomolecules such as antibodies. We demonstrate the use of SERS-labeled antibodies for tissue imaging of the tumor suppressor p63 in prostate biopsies.

Research paper thumbnail of Is Ureteral Stenting Necessary After Uncomplicated Ureteroscopy Lithotripsy for Small Middle and Distal Ureteral Stones?

UroToday International Journal, 2009

Research paper thumbnail of 3D Self-Assembled Plasmonic Superstructures of Gold Nanospheres: Synthesis and Characterization at the Single-Particle Level

Research paper thumbnail of Complete allocation sampling: an efficient and easily implemented adaptive sampling design

Population Ecology, 2010

Adaptive sampling designs are becoming increasingly popular in environmental science particularly... more Adaptive sampling designs are becoming increasingly popular in environmental science particularly for surveying rare and aggregated populations. There are many different adaptive survey designs that can be used to estimate animal and plant abundances. The appealing feature of adaptive designs is that the field biologist gets to do what innately seems sensible when working with rare and aggregated populations-field effort is targeted around where the species is observed in the first wave of the survey. However there are logistical challenges of applying this principle of targeted field-effort whilst remaining in the framework of probability-based sampling. We propose a simplified adaptive survey design where entire strata are sampled. This design incorporates both ideas of targeting field effort and being logistically feasible. We show with a case study population of rockfish that complete allocation stratified sampling is very efficient design.

Research paper thumbnail of Complete Supine Percutaneous Nephrolithotripsy Comparison with the Prone Standard Technique

Journal of Endourology, 2008

Purpose: PCNL (percutaneous nephrolithotripsy) is usually performed in the prone position. The su... more Purpose: PCNL (percutaneous nephrolithotripsy) is usually performed in the prone position. The supine position has potential advantages comparing with the prone position. Our objective is comparison between the outcome of PCNL in the complete supine position and the standard prone position. Material and Methods: A total of 80 patients who underwent PCNL from February 2008 to June 2008 evaluated in a prospective manner, were randomly divided into two groups: 40 patients underwent prone PCNL and 40 patients underwent complete supine PCNL. We performed complete supine PCNL with no rolled towel under the flank and no change in leg position. Results in both positions were compared regarding technical aspects, operative time, stone free rate, complications and hospital stay, and were analyzed using t-test and chi-square. We considered P Ͻ 0.05 as significant. Results: Regardless the position, the pelvicaliceal system could be successfully approached in all patients. Mean operative time in supine group was 74.7 Ϯ 25.1 min and less than prone group (106.87 Ϯ 17.5) with a significant statistical difference (P Ͻ 0.0001). Stone free rate was 80% and 77.5% in prone and supine position respectively. Mean hospital stay was similar in both groups. Bleeding requiring transfusion in two groups had not significant statistical difference. We had not colon injury. Conclusion: PCNL in supine position is safe, effective and suitable for the patients. It offers the potential advantages of better urethral access, less patient handling, needing drape only once, ability to perform simultaneous PCNL and ureteroscopic procedures, better control of the airway during procedures, thus reducing overall operative time compared to traditional prone position and performing PCNL while the surgeon is sitting. It may be considered for most patients requiring PCNL.

Research paper thumbnail of Hydrophilically stabilized gold nanostars as SERS labels for tissue imaging of the tumor suppressor p63 by immuno-SERS microscopy

Chemical Communications, 2011

A biocompatible, seed-mediated synthesis of monodisperse ~60 nm gold nanostars, followed by hydro... more A biocompatible, seed-mediated synthesis of monodisperse ~60 nm gold nanostars, followed by hydrophilic stabilization with ethylene glycol-modified Raman reporter molecules, is presented. Their application as SERS labels for imaging of the tumor suppressor p63 in prostate biopsies by immuno-SERS microscopy is demonstrated.

Research paper thumbnail of Fibroepithelial congenital polyp of prostatic urethra in an adult man

Urology journal, 2009

Received October 2008 Accepted February 2009 INTRODUCTION Fibroepithelial polyps (FEPs) of the ur... more Received October 2008 Accepted February 2009 INTRODUCTION Fibroepithelial polyps (FEPs) of the urethra are rare lesions in adults and are most frequently seen in men during the first decade of life.(1) These lesions are benign and congenital, usually discovered in infants and children, and have rarely been reported in adults.(2,3) Solitary polyps are called different names, such as prostatic urethral polyps, FEPs of the urethra, or benign urethral polyps.(4) Because of their location, as they achieve larger size, they can produce a variety of urinary symptoms including dysuria, hematuria, urinary tract infections, and obstructive symptoms, which may progress to urinary retention.(5) We report a case of benign FEP of the prostatic urethra in a 20-year-old man who presented with obstructive urinary symptoms and urinary retention.

Research paper thumbnail of Inverse Adaptive Cluster Sampling with Unequal Selection Probabilities: Case Studies on Crab Holes and Arsenic Pollution

Australian & New Zealand Journal of Statistics, 2015

Adaptive cluster sampling is an efficient method of estimating the parameters of rare and cluster... more Adaptive cluster sampling is an efficient method of estimating the parameters of rare and clustered populations. The method mimics how biologists would like to collect data in the field by targeting survey effort to localised areas where the rare population occurs. Another popular sampling design is inverse sampling. Inverse sampling was developed so as to be able to obtain a sample of rare events having a predetermined size. Ideally, in inverse sampling, the resultant sample set will be sufficiently large to ensure reliable estimation of population parameters. In an effort to combine the good properties of these two designs, adaptive cluster sampling and inverse sampling, we introduce inverse adaptive cluster sampling with unequal selection probabilities. We develop an unbiased estimator of the population total that is applicable to data obtained from such designs. We also develop numerical approximations to this estimator. The efficiency of the estimators that we introduce is investigated through simulation studies based on two real populations: crabs in Al Khor, Qatar and arsenic pollution in Kurdistan, Iran. The simulation results show that our estimators are efficient.

Research paper thumbnail of Design and synthesis of Raman reporter molecules for tissue imaging by immuno-SERS microscopy

Journal of biophotonics, 2011

The design and synthesis of Raman reporter molecules comprising olefin or alkyne moieties with st... more The design and synthesis of Raman reporter molecules comprising olefin or alkyne moieties with strong and characteristic vibrational Raman bands is presented. Chemisorption onto the surface of colloidal Au/Ag shells yields a self-assembled monolayer. Hydrophilic stabilization of such SERS labels can be achieved by short terminal ethylene glycol units attached to the Raman reporter. Encapsulation by silica with subsequent functionalization of the glass surface allows the conjugation to biomolecules such as antibodies. We demonstrate the use of SERS-labeled antibodies for tissue imaging of the tumor suppressor p63 in prostate biopsies.

Research paper thumbnail of Is Ureteral Stenting Necessary After Uncomplicated Ureteroscopy Lithotripsy for Small Middle and Distal Ureteral Stones?

UroToday International Journal, 2009

Research paper thumbnail of 3D Self-Assembled Plasmonic Superstructures of Gold Nanospheres: Synthesis and Characterization at the Single-Particle Level

Research paper thumbnail of Complete allocation sampling: an efficient and easily implemented adaptive sampling design

Population Ecology, 2010

Adaptive sampling designs are becoming increasingly popular in environmental science particularly... more Adaptive sampling designs are becoming increasingly popular in environmental science particularly for surveying rare and aggregated populations. There are many different adaptive survey designs that can be used to estimate animal and plant abundances. The appealing feature of adaptive designs is that the field biologist gets to do what innately seems sensible when working with rare and aggregated populations-field effort is targeted around where the species is observed in the first wave of the survey. However there are logistical challenges of applying this principle of targeted field-effort whilst remaining in the framework of probability-based sampling. We propose a simplified adaptive survey design where entire strata are sampled. This design incorporates both ideas of targeting field effort and being logistically feasible. We show with a case study population of rockfish that complete allocation stratified sampling is very efficient design.

Research paper thumbnail of Complete Supine Percutaneous Nephrolithotripsy Comparison with the Prone Standard Technique

Journal of Endourology, 2008

Purpose: PCNL (percutaneous nephrolithotripsy) is usually performed in the prone position. The su... more Purpose: PCNL (percutaneous nephrolithotripsy) is usually performed in the prone position. The supine position has potential advantages comparing with the prone position. Our objective is comparison between the outcome of PCNL in the complete supine position and the standard prone position. Material and Methods: A total of 80 patients who underwent PCNL from February 2008 to June 2008 evaluated in a prospective manner, were randomly divided into two groups: 40 patients underwent prone PCNL and 40 patients underwent complete supine PCNL. We performed complete supine PCNL with no rolled towel under the flank and no change in leg position. Results in both positions were compared regarding technical aspects, operative time, stone free rate, complications and hospital stay, and were analyzed using t-test and chi-square. We considered P Ͻ 0.05 as significant. Results: Regardless the position, the pelvicaliceal system could be successfully approached in all patients. Mean operative time in supine group was 74.7 Ϯ 25.1 min and less than prone group (106.87 Ϯ 17.5) with a significant statistical difference (P Ͻ 0.0001). Stone free rate was 80% and 77.5% in prone and supine position respectively. Mean hospital stay was similar in both groups. Bleeding requiring transfusion in two groups had not significant statistical difference. We had not colon injury. Conclusion: PCNL in supine position is safe, effective and suitable for the patients. It offers the potential advantages of better urethral access, less patient handling, needing drape only once, ability to perform simultaneous PCNL and ureteroscopic procedures, better control of the airway during procedures, thus reducing overall operative time compared to traditional prone position and performing PCNL while the surgeon is sitting. It may be considered for most patients requiring PCNL.

Research paper thumbnail of Hydrophilically stabilized gold nanostars as SERS labels for tissue imaging of the tumor suppressor p63 by immuno-SERS microscopy

Chemical Communications, 2011

A biocompatible, seed-mediated synthesis of monodisperse ~60 nm gold nanostars, followed by hydro... more A biocompatible, seed-mediated synthesis of monodisperse ~60 nm gold nanostars, followed by hydrophilic stabilization with ethylene glycol-modified Raman reporter molecules, is presented. Their application as SERS labels for imaging of the tumor suppressor p63 in prostate biopsies by immuno-SERS microscopy is demonstrated.