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Papers by hande akbas

Research paper thumbnail of Elektrokoagülasyon yöntemi ile renk gideriminin incelenmesi

Research paper thumbnail of Dye removal from synthetic and dye bath wastewater by electrocoagulation method and isotherms

MANAS journal of engineering, Dec 21, 2020

In this study, treatment of wastewaters containing Setazol Black TNN, which is a reactive diazo d... more In this study, treatment of wastewaters containing Setazol Black TNN, which is a reactive diazo dyestuff that is prevalently used in dyeing natural fibers in the textile industry, by the electrocoagulation method was examined. Experiments investigating the effectiveness of Al and Fe electrodes in treatment of real wastewaters collected from the dye bath of a yard dyeing facility and synthetic wastewaters prepared with Setazol Black TNN used in this bath were carried out by determining the optimum treatment conditions. The optimum current, pH and initial dye concentration in the synthetic wastewaters for the Al electrodes were 8 ampere (A), 7.57 and 50 mg/L, respectively, while these for the Fe electrodes were 8A, 9 and 100 mg/L, respectively. The optimum current, pH and thinning rate were seen in the dye bath wastewaters for the Al electrodes as 8A, 8 and 1/60 and for the Fe electrodes as 8A, 9 and 1/30, respectively. While carrying out the experiments using these experimental conditions, color and Chemical Oxygen Demand (COD) removal from the synthetic wastewaters and the dye bath wastewaters with long-running treatments was investigated. As a result of the treatment experiments, removal efficiencies of 96% and 57% respectively for color and COD for the Al electrodes and 99% and 61% for the Fe electrodes in the synthetic wastewaters, 87% and 55% for the Al electrodes and 89% and 55% for the Fe electrodes in the dye bath wastewaters were obtained. With this study, it was aimed to reveal not only the position and effectiveness of the treatment process for wastewaters containing intense color but also the effects of chemicals used in dye baths on removal efficiency. Moreover, it was determined that the Langmuir isotherm model was more convenient for the experimental data in the process. In the last part of the study, a correlation analysis was carried out between the color and COD removal efficiencies. Besides, the efficiencies for the use of Al and Fe electrodes respectively for both color and COD removal were compared, and comments were made for different groups by one-way ANOVA..

Research paper thumbnail of Comparison of transvaginal sonography, saline infusion sonography and hysteroscopy in the evaluation of uterine cavity pathologies

Australian & New Zealand Journal of Obstetrics & Gynaecology, 2005

To determine whether performing transvaginal sonography (TVS) and saline infusion sonography (SIS... more To determine whether performing transvaginal sonography (TVS) and saline infusion sonography (SIS) before hysteroscopy could reduce the number of diagnostic hysteroscopies performed for the evaluation of uterine cavity abnormalities.

Research paper thumbnail of Outcome of assisted reproduction treatment in patients with endometrial thickness less than 7 mm

Reproductive Biomedicine Online, 2009

Endometrial thickness is one of the parameters contributing to the outcome of assisted reproducti... more Endometrial thickness is one of the parameters contributing to the outcome of assisted reproduction treatment. The aim of the current study was to investigate the pregnancy rate and the outcome when the endometrial thickness was <7 mm during a treatment cycle. Treatments conducted between January 2000 and December 2004 at the German Hospital in Istanbul were reviewed retrospectively. A total of 175 embryo transfer cycles with an endometrial thickness of <7 mm on the day of oocyte retrieval were assessed. The 175 oocyte retrieval-embryo transfer cycles resulted in 53 pregnancies (30%), of which 11% were biochemical pregnancies, 26% were miscarriages and 58% were delivered. The clinical pregnancy rate was 26%, miscarriage rate was 31% and live birth rate was 17%. However, the results were quite good when the patient age was <35 years or the number of oocytes retrieved was over five or the number of available embryos to transfer was three or more. In conclusion, when the endometrial thickness is <7 mm during an treatment cycle, the couple should be informed about the chance of pregnancy and the outcome. In a young normoresponder woman with at least three embryos available for transfer, transfer could be carried out, otherwise embryo freezing should be recommended.

Research paper thumbnail of Ovarian stimulation in women with high and low body mass index: GnRH agonist versus GnRH antagonist

Reproductive Biomedicine Online, 2010

B Kumbak).

Research paper thumbnail of 5.006 Clinical pregnancy and live birth rates in women ≥38 years old undergoing IVF with and without PGD

Reproductive Biomedicine Online, 2008

have demonstrated a statistically significant difference if we check them with PGD results. Concl... more have demonstrated a statistically significant difference if we check them with PGD results. Conclusion: Morphological embryo selection allows the choice of the best embryos for transferring in recurrent miscarriage couples.

Research paper thumbnail of The effect of a fall in the serum estradiol level prior to egg retrieval on the outcome of assisted reproductive treatment in poor responder women

Fertility and Sterility, 2009

Research paper thumbnail of Assisted reproductive treatment outcome in a large cohort of women with serum FSH above 15 IU/L

Fertility and Sterility, 2009

When controlled for GA, RDS was more significant in the ART group (p¼ .002) compared to the SPON ... more When controlled for GA, RDS was more significant in the ART group (p¼ .002) compared to the SPON group. BPD was more significant in the OVI group (p¼ .027) when compared to the SPON group. Neonates in the IUI (p¼ .003) and OVI (p¼ .000) groups had significantly increased BW when compared to those conceived spontaneously. All other neonatal outcomes including PDA, IVH, NEC, sepsis, LOS, DOV, and mortality were not significant.

Research paper thumbnail of Early clinical pregnancy loss rate in poor responder patients does not change compared to age-matched normoresponders

Fertility and Sterility, 2009

Objective: To investigate the early clinical pregnancy loss rate (ECPLR) of singleton gestations ... more Objective: To investigate the early clinical pregnancy loss rate (ECPLR) of singleton gestations in poor responder (PR) patients. Design: A retrospective study. Setting: Private assisted reproductive technology center. Patient(s): A total of 2,157 singleton clinical pregnancies were identified, 195 from PR and 1,962 from normoresponder (NR) patients. Poor response was accepted as retrieval of four or fewer oocytes. Patients who yielded more than five oocytes were accepted as NR control group. Intervention(s): Patients were age stratified as %35, 36-39, and R40 years. Main Outcome Measure(s): Comparative evaluation of ECPLR in PR and NR patients according to age. Results: Out of 195 singleton clinical pregnancies achieved in poor responders, 31% resulted in early clinical pregnancy loss; ECPLR were 22%, 32%, and 59% in the %35, 36-39, and R40 year age groups, respectively. When ECPLR in singleton gestations of PR patients was compared with that of NR patients according to age, no significant differences were found for all age groups. Conclusion(s): Early clinical pregnancy loss rate was not found to differ significantly between PR and NR patients at all age groups. Therefore, PR patients should be counseled about their lower probability of clinical pregnancy but similar ECPLR compared with their age-matched NR counterparts. (Fertil Steril Ò 2009;91:106-9.

Research paper thumbnail of Elektrokoagülasyon yöntemi ile renk gideriminin incelenmesi

Research paper thumbnail of Dye removal from synthetic and dye bath wastewater by electrocoagulation method and isotherms

MANAS journal of engineering, Dec 21, 2020

In this study, treatment of wastewaters containing Setazol Black TNN, which is a reactive diazo d... more In this study, treatment of wastewaters containing Setazol Black TNN, which is a reactive diazo dyestuff that is prevalently used in dyeing natural fibers in the textile industry, by the electrocoagulation method was examined. Experiments investigating the effectiveness of Al and Fe electrodes in treatment of real wastewaters collected from the dye bath of a yard dyeing facility and synthetic wastewaters prepared with Setazol Black TNN used in this bath were carried out by determining the optimum treatment conditions. The optimum current, pH and initial dye concentration in the synthetic wastewaters for the Al electrodes were 8 ampere (A), 7.57 and 50 mg/L, respectively, while these for the Fe electrodes were 8A, 9 and 100 mg/L, respectively. The optimum current, pH and thinning rate were seen in the dye bath wastewaters for the Al electrodes as 8A, 8 and 1/60 and for the Fe electrodes as 8A, 9 and 1/30, respectively. While carrying out the experiments using these experimental conditions, color and Chemical Oxygen Demand (COD) removal from the synthetic wastewaters and the dye bath wastewaters with long-running treatments was investigated. As a result of the treatment experiments, removal efficiencies of 96% and 57% respectively for color and COD for the Al electrodes and 99% and 61% for the Fe electrodes in the synthetic wastewaters, 87% and 55% for the Al electrodes and 89% and 55% for the Fe electrodes in the dye bath wastewaters were obtained. With this study, it was aimed to reveal not only the position and effectiveness of the treatment process for wastewaters containing intense color but also the effects of chemicals used in dye baths on removal efficiency. Moreover, it was determined that the Langmuir isotherm model was more convenient for the experimental data in the process. In the last part of the study, a correlation analysis was carried out between the color and COD removal efficiencies. Besides, the efficiencies for the use of Al and Fe electrodes respectively for both color and COD removal were compared, and comments were made for different groups by one-way ANOVA..

Research paper thumbnail of Comparison of transvaginal sonography, saline infusion sonography and hysteroscopy in the evaluation of uterine cavity pathologies

Australian & New Zealand Journal of Obstetrics & Gynaecology, 2005

To determine whether performing transvaginal sonography (TVS) and saline infusion sonography (SIS... more To determine whether performing transvaginal sonography (TVS) and saline infusion sonography (SIS) before hysteroscopy could reduce the number of diagnostic hysteroscopies performed for the evaluation of uterine cavity abnormalities.

Research paper thumbnail of Outcome of assisted reproduction treatment in patients with endometrial thickness less than 7 mm

Reproductive Biomedicine Online, 2009

Endometrial thickness is one of the parameters contributing to the outcome of assisted reproducti... more Endometrial thickness is one of the parameters contributing to the outcome of assisted reproduction treatment. The aim of the current study was to investigate the pregnancy rate and the outcome when the endometrial thickness was <7 mm during a treatment cycle. Treatments conducted between January 2000 and December 2004 at the German Hospital in Istanbul were reviewed retrospectively. A total of 175 embryo transfer cycles with an endometrial thickness of <7 mm on the day of oocyte retrieval were assessed. The 175 oocyte retrieval-embryo transfer cycles resulted in 53 pregnancies (30%), of which 11% were biochemical pregnancies, 26% were miscarriages and 58% were delivered. The clinical pregnancy rate was 26%, miscarriage rate was 31% and live birth rate was 17%. However, the results were quite good when the patient age was <35 years or the number of oocytes retrieved was over five or the number of available embryos to transfer was three or more. In conclusion, when the endometrial thickness is <7 mm during an treatment cycle, the couple should be informed about the chance of pregnancy and the outcome. In a young normoresponder woman with at least three embryos available for transfer, transfer could be carried out, otherwise embryo freezing should be recommended.

Research paper thumbnail of Ovarian stimulation in women with high and low body mass index: GnRH agonist versus GnRH antagonist

Reproductive Biomedicine Online, 2010

B Kumbak).

Research paper thumbnail of 5.006 Clinical pregnancy and live birth rates in women ≥38 years old undergoing IVF with and without PGD

Reproductive Biomedicine Online, 2008

have demonstrated a statistically significant difference if we check them with PGD results. Concl... more have demonstrated a statistically significant difference if we check them with PGD results. Conclusion: Morphological embryo selection allows the choice of the best embryos for transferring in recurrent miscarriage couples.

Research paper thumbnail of The effect of a fall in the serum estradiol level prior to egg retrieval on the outcome of assisted reproductive treatment in poor responder women

Fertility and Sterility, 2009

Research paper thumbnail of Assisted reproductive treatment outcome in a large cohort of women with serum FSH above 15 IU/L

Fertility and Sterility, 2009

When controlled for GA, RDS was more significant in the ART group (p¼ .002) compared to the SPON ... more When controlled for GA, RDS was more significant in the ART group (p¼ .002) compared to the SPON group. BPD was more significant in the OVI group (p¼ .027) when compared to the SPON group. Neonates in the IUI (p¼ .003) and OVI (p¼ .000) groups had significantly increased BW when compared to those conceived spontaneously. All other neonatal outcomes including PDA, IVH, NEC, sepsis, LOS, DOV, and mortality were not significant.

Research paper thumbnail of Early clinical pregnancy loss rate in poor responder patients does not change compared to age-matched normoresponders

Fertility and Sterility, 2009

Objective: To investigate the early clinical pregnancy loss rate (ECPLR) of singleton gestations ... more Objective: To investigate the early clinical pregnancy loss rate (ECPLR) of singleton gestations in poor responder (PR) patients. Design: A retrospective study. Setting: Private assisted reproductive technology center. Patient(s): A total of 2,157 singleton clinical pregnancies were identified, 195 from PR and 1,962 from normoresponder (NR) patients. Poor response was accepted as retrieval of four or fewer oocytes. Patients who yielded more than five oocytes were accepted as NR control group. Intervention(s): Patients were age stratified as %35, 36-39, and R40 years. Main Outcome Measure(s): Comparative evaluation of ECPLR in PR and NR patients according to age. Results: Out of 195 singleton clinical pregnancies achieved in poor responders, 31% resulted in early clinical pregnancy loss; ECPLR were 22%, 32%, and 59% in the %35, 36-39, and R40 year age groups, respectively. When ECPLR in singleton gestations of PR patients was compared with that of NR patients according to age, no significant differences were found for all age groups. Conclusion(s): Early clinical pregnancy loss rate was not found to differ significantly between PR and NR patients at all age groups. Therefore, PR patients should be counseled about their lower probability of clinical pregnancy but similar ECPLR compared with their age-matched NR counterparts. (Fertil Steril Ò 2009;91:106-9.