114 results on '"K. Ikuma"'
Search Results
2. Management of the lower uterine ligament in total laparoscopic hysterectomy: options for managing the uterine artery and cardinal ligament
- Author
-
H. Oku, K. Ikuma, A. Saeki, Takashi Matsumoto, Yoshiko Hashimoto, Atsushi Kuno, and Rihoko Kuramori
- Subjects
medicine.medical_specialty ,Ureter ,medicine.anatomical_structure ,business.industry ,Cardinal ligament ,medicine.artery ,Medicine ,Total laparoscopic hysterectomy ,business ,Uterine artery ,Uterine Ligament ,Surgery - Published
- 2010
3. Unsuspected uterine leiomyosarcoma: magnetic resonance imaging findings before and after focused ultrasound surgery
- Author
-
Yasushi Kaji, Kaoru Funaki, Riko Kitazawa, K. Ikuma, Kazuro Sugimura, Hidenobu Fukunishi, and Sohei Kitazawa
- Subjects
Adult ,Leiomyosarcoma ,medicine.medical_specialty ,Ultrasonic Therapy ,Laparoscopic myomectomy ,medicine ,Humans ,Laparoscopy ,medicine.diagnostic_test ,Meglumine ,Uterine leiomyosarcoma ,business.industry ,Obstetrics and Gynecology ,Magnetic resonance imaging ,Focused ultrasound surgery ,medicine.disease ,Magnetic Resonance Imaging ,body regions ,Leiomyoma ,Oncology ,Uterine Neoplasms ,Female ,Radiology ,business ,medicine.drug - Abstract
Uterine leiomyosarcoma, initially diagnosed as leiomyoma on magnetic resonance (MR) images, was disclosed after focused ultrasound surgery (FUS). The tumor did not display high signal intensity on either T1- or T2-weighted images on the patient's first visit. Four months thereafter, T2-weighted images revealed a high signal intensity area within the tumor, while T1-weighted images showed low signal intensity. Six months after FUS, the nonperfused volume calculated on meglumine gadoterate-enhanced T1-weighted images decreased markedly and an intermediate signal intensity in a circular area on T2-weighted images appeared to be atypically increasing in volume. After laparoscopic myomectomy, this tumor was diagnosed as uterine leiomyosarcoma coexistent with leiomyoma. The early stages of uterine leiomyosarcoma are clinically difficult to diagnose; therefore, both careful monitoring during FUS and close follow-up after the procedure are vital.
- Published
- 2007
4. Familial risk among Japanese patients with endometriosis
- Author
-
K. Tanaka, Katsunori Kashima, H. Suginami, K. Ikuma, T. Murakami, Tadayuki Ishimaru, Hitoshi Okamura, and M. Iwashita
- Subjects
Adult ,medicine.medical_specialty ,Adolescent ,Endometriosis ,Japan ,Risk Factors ,Surveys and Questionnaires ,Prevalence ,medicine ,Humans ,Genetic Predisposition to Disease ,Stage (cooking) ,Risk factor ,Sibling ,Family history ,Gynecology ,Obstetrics ,business.industry ,Siblings ,Case-control study ,Obstetrics and Gynecology ,General Medicine ,Middle Aged ,Familial risk ,medicine.disease ,Case-Control Studies ,Relative risk ,Female ,business - Abstract
Objectives: This study was designed to examine the prevalence of endometriosis among female siblings of patients with endometriosis in Japan. Methods: A total of 339 patients with endometriosis were questioned about endometriosis in their sisters. The control group consisted of 284 Japanese healthy fertile women with no history of endometriosis. Similarly, the controls were interviewed about their sisters. Results: We detected sisters with endometriosis in 8.8% of cases and 1.5% of the control population. The relative risk of endometriosis in female siblings was 5.7. However, a significant difference was not seen in age at diagnosis and clinical stage between patients with or without a family history of endometriosis. Conclusions: These data demonstrate a familial tendency for endometriosis and suggest that endometriosis has a genetic factor in the pathogenesis.
- Published
- 2003
5. A new approach for accessing retroperitoneal space using a 10-mm visual access cannula
- Author
-
M. Andou, K. Ikuma, A. Ternamian, and T. Yoshioka
- Subjects
medicine.medical_specialty ,business.industry ,Retroperitoneal Lymph Node ,Cancer therapy ,Laparoscopes ,Cannula ,Surgery ,medicine.anatomical_structure ,Blood loss ,Medicine ,Retroperitoneal space ,business ,Retroperitoneal approach ,Abdominal surgery - Abstract
Retroperitoneal lymph node evaluation is a very important step in planning cancer therapy. Traditional staging laparotomy is too invasive and causes considerable morbidity. However, laparoscopic access of the retroperitoneal space offers the onco-endoscopist a unique, noninvasive, and less dangerous method for assessing and managing women with gynecologic malignancies. The retroperitoneal approach is noninvasive and less dangerous way of accessing the paraaortic space. A new minimally invasive approach of accessing the retroperitoneal space using a 5-mm visual access cannula is introduced. A complete paraaortic and pelvic lymphadenectomy was possible for 60 patients with varied gynecologic malignancies using our retroperitoneal laparoscopic approach. Less blood loss and rapid recovery was observed, and no bowel complication was encountered. The use of the 5-mm visual access cannula offers a less invasive surgical procedure and provides cosmetic advantages.
- Published
- 2003
6. Novel technique for total laparoscopic myomectomy: The 'bottom-up suture'
- Author
-
K Ikuma, Yasuhito Tanase, and T Matsumoto
- Subjects
Novel technique ,medicine.medical_specialty ,Hysterectomy ,business.industry ,medicine.medical_treatment ,Treatment outcome ,Forceps ,Laparoscopic myomectomy ,Myoma ,General Medicine ,medicine.disease ,Surgery ,Suture (anatomy) ,Medicine ,business - Abstract
Introduction: As more women with symptomatic uterine myomas undergo laparoscopic management without hysterectomy, we increasingly encounter many difficult situations, such as of the need to extract large intramural myomas. Even for a skilled surgeon, laparoscopic myomectomy in such a situation is difficult. We have established a new technique for laparoscopic myomectomy to solve these issues called the “bottom-up suture” method. Materials and Surgical Technique: Before complete removal of the myoma, countertraction is applied by an assistant with a claw forceps, elevating the bed of the myoma to make suturing easy. The deep myometrium can be sutured while the myoma is still attached to the uterus. Discussion: This technique, the “bottom-up suture,” may improve the suturing of laparoscopic myomectomies. The advantages of this technique are that it is easy to control unexpected bleeding, and dead space formation can be prevented even when the myomas have grown deep into the uterine myometrium. This technique will become a reliable standard for laparoscopic myomectomy.
- Published
- 2011
7. Enhancement of dynamic range of fiber optic sensor using FBG Fabry-Perot interferometer with pulse-position modulation scheme
- Author
-
S. Tekuramori, K. Ikuma, M. Takeuchi, A. Wada, S. Tanaka, and N. Takahashi
- Subjects
PHOSFOS ,Materials science ,business.industry ,Astrophysics::Instrumentation and Methods for Astrophysics ,Physics::Optics ,Polarization-maintaining optical fiber ,Long-period fiber grating ,Graded-index fiber ,Optics ,Fiber Bragg grating ,Fiber optic sensor ,Dispersion-shifted fiber ,Plastic optical fiber ,business - Abstract
Dynamic-range enhancement of a fiber optic sensor, which consists of an in-fiber Fabry-Perot interferometer (FPI) with chirped fiber Bragg gratings as mirrors, is demonstrated using multiple FPI resonant peaks in the pulse-position modulation scheme.
- Published
- 2013
8. Novel technique for total laparoscopic myomectomy: the 'bottom-up suture'
- Author
-
Y, Tanase, K, Ikuma, and T, Matsumoto
- Subjects
Adult ,Treatment Outcome ,Leiomyoma ,Suture Techniques ,Uterine Neoplasms ,Myometrium ,Humans ,Female ,Laparoscopy - Abstract
As more women with symptomatic uterine myomas undergo laparoscopic management without hysterectomy, we increasingly encounter many difficult situations, such as of the need to extract large intramural myomas. Even for a skilled surgeon, laparoscopic myomectomy in such a situation is difficult. We have established a new technique for laparoscopic myomectomy to solve these issues called the "bottom-up suture" method.Before complete removal of the myoma, countertraction is applied by an assistant with a claw forceps, elevating the bed of the myoma to make suturing easy. The deep myometrium can be sutured while the myoma is still attached to the uterus.This technique, the "bottom-up suture," may improve the suturing of laparoscopic myomectomies. The advantages of this technique are that it is easy to control unexpected bleeding, and dead space formation can be prevented even when the myomas have grown deep into the uterine myometrium. This technique will become a reliable standard for laparoscopic myomectomy.
- Published
- 2012
9. Laparoscopic surgery for colpopoiesis with the pelvic peritoneum: first report in Japan
- Author
-
K, Ikuma and S, Ohashi
- Abstract
Several methods have been developed for colpopoiesis in patients with vaginal agenesis. Nonetheless, various problems remain, including technical difficulty, invasiveness, operative stress, and poor cosmetic results, as well as the insufficient naturalness of the vagina itself. We have successfully completed colpopoiesis using the pelvic peritoneum in a laparoscopic surgery for Rokitansky-Küster-Hauser syndrome (RKH).
- Published
- 2011
10. Development of Extrusion Molded Nd-Fe-B Magnets
- Author
-
K. Ikuma, K. McAloon, M. Sakata, T. Iwasa, R. Watanabe, and H. Miyadera
- Subjects
Extrusion moulding ,Materials science ,business.product_category ,Metallurgy ,Demagnetizing field ,Epoxy ,Molding (process) ,Magnetic anisotropy ,visual_art ,Magnet ,visual_art.visual_art_medium ,Die (manufacturing) ,Extrusion ,business - Abstract
A new manufacturing process for extrusion molded magnets, composed of isotropic Nd-Fe-B powder and NyIon-12, has been developed. This newly developed extrusion molding process has several interesting features. First, the extruded product contains 72% by volume magnetic powder and yields a (BH) max of 8.0 MGOe. Second, through the addition of an anti-oxidant, the viscosity of the magnetic powder-nylon compound remains almost constant during molding. Third, by means of a specially cooled outlet, which is separated from the heated die by a thermal insulator, an optimized temperature profile is obtained which yields uniformly smooth extrusion molded magnets. Both long thin-walled magnets and small arc-shaped ("kawala") magnets are easily molded by this new process.
- Published
- 1993
11. The vasopressin injection technique for laparoscopic excision of ovarian endometrioma: a technique to reduce the use of coagulation
- Author
-
Yasuhito Tanase, K. Ikuma, A. Saeki, Fujiyuki Inaba, Atsushi Kuno, H. Oku, and Takashi Matsumoto
- Subjects
Adult ,medicine.medical_specialty ,Ovarian Cortex ,Vasopressins ,medicine.medical_treatment ,Endometriosis ,Injections, Intralesional ,Hemostatics ,Cystectomy ,medicine ,Humans ,Ovarian Diseases ,Prospective Studies ,Ovarian reserve ,Laparoscopy ,Prospective cohort study ,medicine.diagnostic_test ,business.industry ,Dissection ,Obstetrics and Gynecology ,medicine.disease ,Hemostasis, Surgical ,Surgery ,Treatment Outcome ,Hemostasis ,Ovarian Endometriosis ,Female ,business - Abstract
Study Objective To estimate the efficacy of the vasopressin injection technique for laparoscopic cystectomy of ovarian endometriomas with regard to operative time and coagulation events. Design Prospective study (Canadian Task Force Classification II-1) Setting Osaka Central Hospital in Osaka, Japan Patients Fifteen women with single lobular similarly-sized ovarian endometrioma. Interventions Women who planned to undergo laparoscopic cystectomy of endometrioma were allocated randomly to 3 groups: (1) ordinary laparoscopic cystectomy without injection, (2) laparoscopic cystectomy with the injection of saline solution, and (3) laparoscopic cystectomy with the vasopressin injection technique. Measurements and Main Results Reviewing the video, we counted the number of pinpoint bipolar coagulations on the normal ovarian cortex that were required from the beginning of stripping until hemostasis had been achieved, as well as the times required to achieve hemostasis. The group with the vasopressin injection technique required significantly fewer coagulation events (p=.041) to achieve hemostasis, as compared with the group receiving an ordinary cystectomy. Conclusion The vasopressin injection technique reduces the use of coagulation, in such a way as to suggest the possibility to protect ovarian reserves.
- Published
- 2009
12. A new approach for accessing retroperitoneal space using a 5-mm [corrected] visual access cannula
- Author
-
M, Andou, T, Yoshioka, K, Ikuma, and A, Ternamian
- Subjects
Adult ,Genital Neoplasms, Female ,Humans ,Female ,Equipment Design ,Retroperitoneal Space ,Middle Aged ,Laparoscopes ,Aged ,Catheterization - Abstract
Retroperitoneal lymph node evaluation is a very important step in planning cancer therapy. Traditional staging laparotomy is too invasive and causes considerable morbidity. However, laparoscopic access of the retroperitoneal space offers the onco-endoscopist a unique, noninvasive, and less dangerous method for assessing and managing women with gynecologic malignancies. The retroperitoneal approach is noninvasive and less dangerous way of accessing the paraaortic space. A new minimally invasive approach of accessing the retroperitoneal space using a 5-mm visual access cannula is introduced. A complete paraaortic and pelvic lymphadenectomy was possible for 60 patients with varied gynecologic malignancies using our retroperitoneal laparoscopic approach. Less blood loss and rapid recovery was observed, and no bowel complication was encountered. The use of the 5-mm visual access cannula offers a less invasive surgical procedure and provides cosmetic advantages.
- Published
- 2004
13. Laparoscopic ovarian cystectomy using double balloon catheter: a new technical application
- Author
-
K, Ikuma, Y, Koyasu, Y, Yamada, S, Ohashi, and M, Haque
- Abstract
In the present study, a modified application of the surgical instrument with double balloon is described in the ovarian cystectomy procedure. This technique has been proved effective and safe especially in removing chocolate-like cystoma. This new instrument, which we originally designed, has two balloons at the tip of the catheter. After a cyst is punctured, the inner and outer balloons are inflated to fix the cyst well. After fixing the cyst with two balloons, the internal needle of the instrument can be removed. This catheter, named the SAND balloon catheter, is advantageous in laparoscopic ovarian cystectomy.
- Published
- 2003
14. Structure of Boc-Phe-D-Leu-OMe
- Author
-
Masatoshi Inoue, Mitsunobu Doi, Toshimasa Ishida, Y. In, and K. Ikuma
- Subjects
Crystal ,chemistry.chemical_compound ,Dipeptide ,chemistry ,Stereochemistry ,Hydrogen bond ,X-ray crystallography ,Side chain ,Sheet structure ,Molecule ,General Medicine ,Crystal structure ,General Biochemistry, Genetics and Molecular Biology - Abstract
The X-ray crystal structure analysis of tertbutoxycarbonyl-L-phenylalanyl-D-leucine methyl ester showed two crystallographically independent molecules, each of them taking a similar open conformation in which the tert-butoxycarbonyl group and D-leucine isobutyl side chain are located facing parallel to each other. In the crystal, these molecules are piled up alternately along the b axis and form an infinite sheet structure through four independent NH...O-C hydrogen bonds
- Published
- 1993
15. Laparoscopic surgery assisted by a transvaginal approach
- Author
-
E, Taniguchi, S, Ohashi, S, Takiguchi, H, Kanno, T, Oriyama, K, Ikuma, and T, Taguchi
- Subjects
Adult ,Aged, 80 and over ,Rectal Diseases ,Stomach Neoplasms ,Vagina ,Endometriosis ,Humans ,Female ,Laparoscopy ,Aged - Abstract
We used laparoscopic surgery assisted by a transvaginal approach for gastrointestinal diseases. In the first case, a huge submucosal tumor enucleated laparoscopically from the minor curvature of the stomach was extracted through the vagina. In the second case, partial resection of the rectum to treat rectal endometriosis was performed laparoscopically with the assistance of manual handling inserted transvaginally. Although it can be applied only to female patients, especially to multipara, the vagina as an access point to the abdominal cavity can be widely used for various purposes in laparoscopic surgery.
- Published
- 1999
16. Laparoscopic colpopoiesis using sigmoid colon
- Author
-
K, Ikuma, S, Ohashi, Y, Koyasu, K, Tei, and S M, Haque
- Subjects
Adult ,Colon, Sigmoid ,Vagina ,Humans ,Female ,Laparoscopy - Abstract
A new technique for colpopoiesis using sigmoid colon autograft by a laparoscopic surgery is introduced for the first time. This technique requires advanced skills perform and may be the choice in respect to naturalness and permanency of the neovagina with minimum invasion.
- Published
- 1997
17. [Laparoscopically assisted colpopoesis using sigmoid colon]
- Author
-
K, Ikuma, Y, Koyasu, Y, Yamada, and T, Hayashi
- Subjects
Adult ,Colon, Sigmoid ,Vagina ,Humans ,Female ,Laparoscopy - Published
- 1996
18. Laparoscopic ovarian cystectomy: extraperitoneal method
- Author
-
K, Ikuma, Y, Koyasu, Y, Yamada, and T, Hayashi
- Abstract
A laparoscopic method for resecting benign ovarian cysts has been devised and involves excising the cyst wall extraperitoneally after aspirating the cystic fluid. In this report, the technique and clinical results are described and mini-laparotomy which is used in this technique is discussed. A total of 104patients were treated by this method. The diagnosis was simple cyst in 46,dermoid cyst in 33,and chocolate cyst in 25. The method was successful in 90 patients (87%).The remaining 14(14%)were converted to open surgery, 9 be- cause of severe adhesions. The remaining 5 patients had various complications: malignancy, bladder injury, dermoid content too solid to aspirate, and bleeding. We found endometrioid adenocarcinoma in 1 patient whose chocolate cyst could be removed completely.
- Published
- 1996
19. [Application of the laparoscopic surgery: colpopoiesis using peritoneum for the agenesis of the vagina]
- Author
-
K, Ikuma, T, Hayashi, Y, Koyasu, and Y, Yamada
- Subjects
Adolescent ,Vagina ,Humans ,Female ,Laparoscopy ,Peritoneum - Published
- 1994
20. Bottom-Up Suture in Laparoscopic Myomectomy
- Author
-
K. Ikuma, H. Chien, Y. Kawamata, Takashi Matsumoto, A. Saeki, H. Oku, and A. Onogi
- Subjects
medicine.medical_specialty ,Suture (anatomy) ,business.industry ,Obstetrics and Gynecology ,Medicine ,Laparoscopic myomectomy ,business ,Surgery - Published
- 2011
21. Fertility after Laparoscopically Assisted Segmental Bowel Resection for Rectal Endometoriosis
- Author
-
A. Oonogi, Takashi Matsumoto, K. Ikuma, H. Chien, H. Oku, Y. Kawamata, and A. Saeki
- Subjects
medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,media_common.quotation_subject ,Obstetrics and Gynecology ,Medicine ,Fertility ,Bowel resection ,business ,Surgery ,media_common - Published
- 2011
22. [Laparoscopic resection of ovarian cysts: precautions and improvements in the procedure and application of the mini-laparotomy]
- Author
-
K, Ikuma, T, Shiotani, and H, Shibahara
- Subjects
Ovarian Neoplasms ,Pregnancy Complications ,Ovarian Cysts ,Pregnancy ,Humans ,Female ,Laparoscopy ,Carcinoma, Endometrioid ,Dermoid Cyst - Abstract
We previously devised and reported a laparoscopic resection of benign ovarian cysts. In the present paper, we report precautions and improvements in the procedure and the application of the mini-laparotomy. 1. The subjects consisted of a total of 41 cases with preoperatively diagnosed cysts. These were 17 cases with simple cysts, 15 cases with dermoid cysts, and nine cases with chocolate cysts. The present surgical procedure was performed on 34 (83%) cases. 2. One case, preoperatively diagnosed as a chocolate cyst, was diagnosed as an endometrioid adenocarcinoma. 3. Laparotomy was required in 7 cases; in four as a result of hard adhesions, in one because it was impossible to withdraw fluid, in one due to a damaged urinary bladder and in one due to endometrioid adenocarcinoma. 4. It became essential to classify the ovarian cysts into three groups according to size. 5. Mini-laparotomy was performed for two giant ovarian cysts and five ovarian cysts in pregnant women. In this procedure the goal is minimal, simple, safe and reliable surgery with results equal to those of standard laparotomy.
- Published
- 1993
23. [Laparoscopy-assisted vaginal hysterectomy]
- Author
-
K, Ikuma, T, Shiotani, and H, Shibahara
- Subjects
Adult ,Hysterectomy, Vaginal ,Humans ,Female ,Laparoscopy ,Middle Aged ,Aged - Published
- 1993
24. Laparoscopic Excision of Endometrioma Using the Vasopressin Injection Technique: Some Suggestions for Quality Operation
- Author
-
R. Kuramori, A. Saeki, Y. Akashi, H.W. Chen, H. Oku, K. Ikuma, Y. Hashimoto, and Takashi Matsumoto
- Subjects
medicine.medical_specialty ,Vasopressin ,Endocrinology ,business.industry ,Internal medicine ,media_common.quotation_subject ,medicine ,Obstetrics and Gynecology ,Quality (business) ,Laparoscopic excision ,business ,Surgery ,media_common - Published
- 2010
25. [Laparoscopy-guided extraperitoneal resection of ovarian cysts: surgical procedure, indications and limitations]
- Author
-
K, Ikuma, T, Shiotani, and H, Shibahara
- Subjects
Adult ,Aged, 80 and over ,Ovarian Cysts ,Adolescent ,Surgical Procedures, Operative ,Humans ,Female ,Laparoscopy ,Middle Aged ,Aged - Abstract
We designed a new surgical method for the treatment of benign ovarian cysts. We have previously reported that, with our laparoscopy-guided method, the cyst wall is pulled outside the abdominal cavity after evacuation of the cyst contents, and resection is performed by the same method as during laparotomy. The preoperative assessment and surgical findings were investigated in 16 subjects, 5 with simple cysts, 2 with para-ovarian cysts, 2 with chocolate cysts, 5 with dermoid cysts and 2 with mucinous cysts. This surgical method was applicable in 11 of the 14 patients. Laparotomy was required in the other 3, because 2 of the patients had strong adhesions and in 1 evacuation was impossible. The patients were classified into 3 grades of difficulty before surgery: Grade I; operable, Grade II; operable with special care, Grade III; laparotomy required. During surgery, the feasibility of continuing the procedure was also assessed. In this surgical procedure, through a small incision in the abdominal wall, the entire resection of an ovarian cyst is done extra-peritoneally. However, the eligibility of patients for this method needs to be very carefully examined preoperatively and reviewed throughout the procedure.
- Published
- 1992
26. [Laparoscopy-guided cystectomy of the ovarian cyst]
- Author
-
K, Ikuma, H, Shibahara, T, Shiotani, and I, Okada
- Subjects
Adult ,Aged, 80 and over ,Ovarian Cysts ,Adolescent ,Methods ,Humans ,Female ,Laparoscopy ,Aged - Published
- 1992
27. [Invasive hydatidiform mole in the fallopian tube: report of a case]
- Author
-
K, Ikuma, I, Okada, T, Shiotani, H, Shibahara, and T, Takemura
- Subjects
Adult ,Pregnancy ,Fallopian Tube Neoplasms ,Humans ,Female ,Hydatidiform Mole - Published
- 1992
28. [Serous surface papillary carcinoma of the peritoneum: a case report]
- Author
-
K, Ikuma, K, Yamada, H, Yamasaki, and T, Takemura
- Subjects
Humans ,Female ,Middle Aged ,Tomography, X-Ray Computed ,Carcinoma, Papillary ,Peritoneal Neoplasms ,Ultrasonography - Published
- 1992
29. Total Laparoscopic Vaginal Reconstruction Using Sigmoid Colon in a Case of Rokitansky-Kuster-Hauser Syndrome
- Author
-
Y. Tanase, K. Ikuma, Atsushi Kuno, A. Saeki, Takashi Matsumoto, and H. Oku
- Subjects
medicine.medical_specialty ,medicine.anatomical_structure ,Vaginal reconstruction ,business.industry ,medicine ,Obstetrics and Gynecology ,Sigmoid colon ,business ,Rokitansky Kuster Hauser syndrome ,Surgery - Published
- 2008
30. A Case of Successful Laparoscopic Treatment of Bladder Endometriosis
- Author
-
H. Oku, A. Saeki, Takashi Matsumoto, Y. Tanase, K. Ikuma, and Atsushi Kuno
- Subjects
medicine.medical_specialty ,business.industry ,medicine ,Obstetrics and Gynecology ,business ,Bladder endometriosis ,Laparoscopic treatment ,Surgery - Published
- 2008
31. 245: The Vasopressin Injection Technique for Ovarian Endometrioma
- Author
-
A. Saeki, Takashi Matsumoto, and K. Ikuma
- Subjects
Ovarian Endometrioma ,medicine.medical_specialty ,Vasopressin ,business.industry ,Urology ,medicine ,Obstetrics and Gynecology ,business - Published
- 2007
32. 375: A Novel Technique of Laparoscopic Myomectomy
- Author
-
Takashi Matsumoto, K. Ikuma, Y. Tanase, and Atsushi Kuno
- Subjects
Novel technique ,medicine.medical_specialty ,business.industry ,medicine ,Obstetrics and Gynecology ,Laparoscopic myomectomy ,business ,Surgery - Published
- 2007
33. 425: 'Full Course' Endometriosis Surgery for Focal Adenomyosis with Severe Endometriosis
- Author
-
H. Oku, K. Ikuma, and Takashi Matsumoto
- Subjects
medicine.medical_specialty ,business.industry ,medicine ,Severe endometriosis ,Endometriosis surgery ,Obstetrics and Gynecology ,Adenomyosis ,medicine.disease ,business ,Surgery - Published
- 2007
34. A new approach for accessing retroperitoneal space using a 5-mm visual access cannula
- Author
-
K. Ikuma, A. Ternamian, M. Andou, and T. Yoshioka
- Subjects
Surgery - Published
- 2003
35. Conformational characteristics of receptor-selective opioid peptides. 1H n.m.r. and c.d. spectroscopic studies of δ-kephalin and [Val4]morphiceptin
- Author
-
Kunihiro Kitamura, K Ikuma, Masayuki Tanaka, Masatoshi Inoue, M Nabae, Mitsunobu Doi, and Toshimasa Ishida
- Subjects
Morphiceptin ,Magnetic Resonance Spectroscopy ,Protein Conformation ,Stereochemistry ,Chemistry ,Hydrogen bond ,Circular Dichroism ,Temperature ,Enkephalins ,Cell Biology ,Biochemistry ,Solvent ,chemistry.chemical_compound ,Intramolecular force ,Amide ,Receptors, Opioid ,Solvents ,Endorphins ,Opioid peptide ,Receptor ,Oligopeptides ,Molecular Biology ,Vicinal ,Research Article - Abstract
An investigation on the conformations of highly receptor-selective opioid peptides was carried out to gain further understanding of the structure-activity relationship of endogenous enkephalins. The preferred conformations of a highly mu-selective [Val4]morphiceptin and a highly delta-selective delta-kephalin have been probed by 1H n.m.r. solvent-, concentration- and temperature-dependences of amide protons to take the folded conformations stabilized by an intramolecular hydrogen bond and the anti-parallely extended dimeric structures respectively. Their possible stereo-conformations were proposed, based on the analyses of the vicinal coupling constants (JHNC alpha H). The conformational difference between the mu- and delta-selective opioid peptides was further ascertained by the c.d. measurements. The c.d. spectra of the mu-selective peptides show negative bands in the range of 210-230 nm, while those of the delta-selective ones show the opposite positive bands. A correlation between c.d. spectra and receptor-selectivity was possible.
- Published
- 1988
36. Application of the quantitative sperm immobilization test for follow-up study of sperm-immobilizing antibody in the sera of sterile women
- Author
-
K, Koyama, K, Kubota, K, Ikuma, M, Shigeta, and S, Isojima
- Subjects
Adult ,Immunoassay ,Male ,Sperm Motility ,Humans ,Female ,Infertility, Female ,Spermatozoa ,Antibodies - Abstract
For quantitative estimation of sperm immobilizing antibody, a new assay method was developed and applied to a follow-up study of antibody titers in the sera of sterile women. The 50% sperm immobilization units (SI50) estimated by the quantitative method ranged from 1.2 to 97.3 in the sera from 16 sterile women who showed relatively high antibody activities in the previous semiquantitative sperm immobilization test. When the quantitative antibody titers, SI50, were followed over 3 years in sterile women with the sperm immobilizing antibody, the antibody titers were found to be unstable, and undulated over a period of several months. Therapy consisting of use of a condom seemed to be ineffective in decreasing the antibody titers.
- Published
- 1988
37. [Role of sperm passage through cervical mucus: fertilizing capacity tested by in vitro fertilization with zona-free hamster eggs]
- Author
-
K, Ikuma, S, Suno, A, Hasegawa, K, Koyama, and S, Isojima
- Subjects
Male ,Sperm-Ovum Interactions ,Cricetinae ,Cervix Mucus ,Animals ,Humans ,Female ,Fertilization in Vitro ,Sperm Capacitation ,Spermatozoa ,Zona Pellucida - Abstract
The effect of sperm passage through cervical mucus (CM) on the fertilizing capacity of human spermatozoa was examined in the in vitro fertilization system of zona-free hamster eggs. Each drop of ejaculated semen and BWW culture medium was connected by a small capillary tube filled with preovulatory CM, egg white or BWW medium under liquid paraffin oil in a plastic petri dish. After 2 hours, zona-free hamster eggs were added to the drop of BWW culture medium containing spermatozoa which had passed through the capillary tube and the mixture was incubated for various lengths of time at 37 degrees C under 5% CO2 in air. Human spermatozoa, which were washed and preincubated for 2 hours in BWW medium, were capable of fertilizing zona-free hamster eggs but needed a longer incubation time than spermatozoa which had passed through CM. Fertilization rates of spermatozoa which had passed through CM and egg white were very similar, but no fertilization occurred in the drop containing spermatozoa which had passed through BWW medium, presumably because of the contamination with seminal plasma. These results indicate that the most important role of CM may be to separate motile spermatozoa from seminal plasma components hostile to fertilization.
- Published
- 1989
38. [Bovine cervical mucus as a substitute of human cervical mucus]
- Author
-
K, Ikuma, Y, Saito, M, Takeda, K, Koyama, and S, Isojima
- Subjects
Male ,Sperm-Ovum Interactions ,Cervix Mucus ,Animals ,Humans ,Cattle ,Female ,Oligospermia ,Sperm Transport - Abstract
The sperm penetration test (SPT) in cervical mucus (CM) is an important test in screening for sperm-CM incompatibility. For a routine SPT, a sufficient amount of preovulatory CM is necessary, but the amount of human CM is often inadequate. We examined estrous bovine CM as a substitute for human CM in the SPT. Preovulatory human CM and estrous bovine CM were collected and stored frozen at -20 degrees C until use. After being thawed at room temperature, the two CM samples were compared as to their pH, spinnbarkeit and ferning patterns, and it was found that they are quite similar. In Kremer's method of SPT, sperm penetration distance, density and motility were similar in human and bovine CM for 12 hours, but thereafter sperm motility became much lower in bovine CM than in human CM. The results of SPT with spermatozoa from patients with oligozoospermia were quite similar in both CMs. When spermatozoa pretreated with antisperm antibody were used for SPT, sperm penetration was completely blocked in human CM, but no inhibition was seen in bovine CM. From these results, we conclude that bovine CM can be substituted for human CM for some, but not all, purposes.
- Published
- 1988
39. [Production and characterization of a monoclonal sperm immobilizing antibody to seminal plasma antigens]
- Author
-
M, Shigeta, Y, Takada, K, Ikuma, K, Kubota, K, Koyama, and S, Isojima
- Subjects
Male ,Hybridomas ,Antibodies, Monoclonal ,Chromosome Mapping ,Cell Differentiation ,Rats ,Cell Fusion ,Mice ,Immunoglobulin M ,Antibody Specificity ,Semen ,Sperm Motility ,Animals ,Humans ,Cells, Cultured ,Spleen - Abstract
Rat spleen cells immunized to human azoospermic semen were fused with mouse myeloma cells (P3 X 63Ag8Ul) to obtain hybridomas which produce monoclonal sperm immobilizing antibodies. Of 114 hybrid clones obtained, 10 were found to produce antibodies with sperm immobilizing activity with complement. One clone (1C4) producing the highest antibody titer was chosen for further characterization. Chromosome analysis showed that 1C4 hybridoma cells contained two types of chromosomes which were derived from rat and mouse. Rat Ig was detected in both the cytoplasma and the culture medium of the cells by direct immunofluorescent test and immunodiffusion test, respectively. Gammaglobulin fractions from the culture medium had a strong sperm immobilizing activity and showed a common single precipitin line against human seminal plasma and human milk proteins. It was proved that the monoclonal antibody was produced to No. 7 antigen and not to No. 3 antigen (lactoferrin) in human seminal plasma, both of which have a common antigenicity to human milk proteins and compose the sperm coating antigens.
- Published
- 1985
40. [Successful application of in vitro fertilization and embryo replacement in the treatment of infertile women with sperm immobilizing antibody]
- Author
-
Y, Sugimoto, A, Hasegawa, K, Yokoyama, Y, Ikeda, T, Bessho, M, Shigeta, K, Ikuma, S, Taira, K, Koyama, and S, Isojima
- Subjects
Adult ,Male ,Sperm Motility ,Humans ,Female ,Fertilization in Vitro ,Embryo Transfer ,Infertility, Female ,Spermatozoa ,Antibodies - Abstract
Thirteen infertile patients (18 cycles) with sperm immobilizing antibodies were subjected to in vitro fertilization and embryo replacement (IVF-ER) therapy during 12 months from January to December 1985. Four patients became pregnant, two of them delivered healthy babies at term and 2 had abortions at 5 weeks and 12 weeks of gestation, respectively. In the same duration, 24 patients (28 cycles) with tubal factor and 4 patients (5 cycles) with male factor for infertility were subjected to IVF-ER, and two patients with tubal factor became pregnant and delivered healthy babies at term. In the patients with immunological factor, fertilization and cleavage rates per mature oocyte were 85.9% (55 fertilized/64 oocytes) and 81.3% (52 cleaved/64 oocytes) respectively, while the fertilization rates in patients with tubal factor and male factor were 70.5% (62 fertilized/88 oocytes) and 50.0% (6 fertilized/12 oocytes) respectively and all fertilized eggs in these patients developed to the cleavage stage. Thus fertilization and cleavage rates for mature oocytes from the patients with the immunological factor were slightly better than those with the tubal factor and much better than those with the male factor. The antisperm antibody titers (SI50) in sera determined by the quantitative sperm immobilization test ranged from 20 to 243 units while those in follicular fluids ranged from 21 to 160 units in the patients with the immunological factor. The follicular sperm immobilizing antibodies could be detected in any patient who had the antibodies in the serum. Immunoglobulin (IgG, IgA, IgM) concentrations in follicular fluids were not significantly different from each other in the patients with immunological, tubal and male factor for infertility.
- Published
- 1987
41. [Role of complement for the sensitivity of sperm immobilization test (author's transl)]
- Author
-
T, Kamata, K, Ikuma, K, Kubota, K, Koyama, and S, Isojima
- Subjects
Male ,Mice ,Guinea Pigs ,Sperm Motility ,Animals ,Humans ,Female ,Complement System Proteins ,Rabbits ,Spermatozoa ,Rats - Abstract
For detecting the sperm immobilizing antibody in the sera of infertile women with unknown cause, Isojima's sperm immobilization test was widely used, but there was great difference on the percentage of positive results among several laboratories. For analysis of factors influencing the sensitivity of the test, source and amount of complement were studied, and the following results were obtained. 1. Guinea pig serum which contained more than 200 CH50 as hemolytic titer was best for this test. 2. Rat and rabbit sera which contained much lower CH50 than guinea pig indicated relatively good sensitivity for the test. 3. Human serum which contained 34.9 CH50/ml and mouse serum which contained less than 5 CH50/ml, both could not work on sperm immobilization test. The human serum (AB) which was concentrated to the level of guinea pigs serum as CH50 did not work well on sperm immobilization test as guinea pig serum. 4. When the complement from same source was used, the positive correlation between CH50 (hemolytic titer) and 50% sperm immobilization titer (SI50) was present, but if the complement source was different, there was no correlation between CH50 and SI50. 5. It was proved that more than 10 CH50 of guinea pig serum was necessary for sperm immobilization test to obtain the most sensitive results.
- Published
- 1981
42. [Comparative studies on doses of complement for detection of sperm immobilizing antibody in serum, cervical mucus and seminal plasma (author's transl)]
- Author
-
T, Kamata, Y, Takada, K, Ikuma, K, Kubota, K, Koyama, and S, Isojima
- Subjects
Male ,Semen ,Guinea Pigs ,Cervix Mucus ,Sperm Motility ,Animals ,Humans ,Female ,Complement System Proteins ,Spermatozoa ,Antibodies - Abstract
In Isojima's sperm immobilization test, the complement is one of the most important factors which influence on sensitivity of the test. Previously we reported that more than 10 CH50 of guinea pig serum complement was necessary in the reaction to obtain the best result for measuring the sperm immobilizing antibody in the serum. This time, the influences of various test specimens on complement activities for the sperm immobilization test were studied and the necessary amounts of complement to detect the sperm immobilizing antibody in serum, cervical mucus and seminal plasma were compared. In the sperm immobilization test, the following results were obtained: 1. The amount of complement (guinea pig serum) added was 11.9 CH50, and after 60 minutes incubation at 32 degrees C in veronal buffer (VB2+), 2.0 +/- 0.3 (M +/- SD) of CH50 was consumed. 2. When human serum, cervical mucus and seminal plasma were added to the reaction as specimens, the complement consumptions (M +/- SD) were more 0.2 +/- 0.3 CH50, 0.2 +/- 0.2 CH50 and 3.3 +/- 0.8 CH50 than that of VB2+ buffer respectively. 3. When the washed human spermatozoa were added, the consumed amounts of complement (M +/- SD) were dose dependent; 3.5 +/- 0.7 CH50 for 100 X 10(4) spermatozoa, 7.3 +/- 0.3 CH50 for 200 X 10(4) spermatozoa and 15.7 +/- 2.2 CH50 for 400 X 10(4) spermatozoa. 4. In our sperm immobilization test, the net consumptions of complement (M +/- SD) were 5.0 +/- 0.7 CH50 for specimen of serum, 4.9 +/- 0.8 CH50 for specimen of cervical mucus and 11.1 +/- 1.2 CH50 for specimen of seminal plasma. 5. Complement doses necessary to obtain the most sensitive sperm immobilization tests were 10 CH50 for both serum and cervical mucus specimens, and 15 CH50 for seminal plasma specimen.
- Published
- 1981
43. [Detection of early pregnancy factor in the sera of conceived women before nidation]
- Author
-
T, Bessho, S, Taira, K, Ikuma, M, Shigeta, K, Koyama, and S, Isojima
- Subjects
Rosette Formation ,Pregnancy Tests ,Pregnancy Proteins ,Diagnosis, Differential ,Contraception ,Pregnancy ,Chaperonin 10 ,Suppressor Factors, Immunologic ,Humans ,Female ,Embryo Implantation ,Peptides ,Infertility, Female ,Immunosuppressive Agents - Abstract
In order to apply the early pregnancy factor (EPF) to early diagnosis of fertilization, the establishment of optimal conditions for assay of EPF was attempted, and then EPF in the sera of contracepted and conceived women 4 to 6 days after ovulation were measured. For assay of EPF, 0.25 ml of 1:2 step diluted anti-human lymphocyte serum (ALS), 0.05ml of guinea pig serum as complement and 0.1ml of lymphocytes suspension (1 X 10(7)/ml) pretreated with test serum were mixed and then incubated at 37 degrees C for 90 min. To this mixture 0.1ml of sheep red blood cell suspension (2 X 10(9)/ml) was added and the rosette formation was counted after centrifugation. The rosette inhibition titer (RIT) was expressed as reciprocal of ALS dilutions which resulted in less than 75% of rosette formation as compared with the control. RITs of the conceived women who were assayed on the 5 th day after ovulation were in the range from 16 to 32 X 10(3), while that of the control contraceptive women who were assayed on the same day was in the range from 2 to 4 X 10(3). The sterile women who received AIH but failed to conceive all showed less than 4 X 10(3) as RIT. These results suggest that the assay of EPF is valuable in detecting the early stage of fertilization and possibly may help to differentiate the impairment of embryo implantation from non-fertilization of the ovum as a cause of sterility.
- Published
- 1984
44. RNA-modifying enzyme Alkbh8 is involved in mouse embryonic development.
- Author
-
Nakai M, Hase H, Zhao Y, Okawa K, Honda K, Ikuma K, Kitae K, and Tsujikawa K
- Abstract
RNAs undergo more than 300 modifications after transcription. Aberrations in RNA modifications can lead to diseases; their involvement in fetal development has been suggested. This study explored the RNA modifications related to fetal development in mice. We quantified changes in RNA modifications present in mouse embryos at each stage: Metaphase II (MII) oocyte; pronucleus; 2-cell; morula; blastocyst; embryonic days (E)10.5, 13.5, 16.5, and 19.5; and newborn (post-natal day [P]0) using ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Our results confirm that many RNAs undergo dynamic modifications. In particular, 5-methoxycarbonylmethyluridine (mcm5U) modification was distinctive and increased during the fetal period. In Alkbh8 -knockout (KO) mice, the tRNA protein translation efficiency was reduced. Proteome analysis revealed that the factors downregulated in Alkbh8 -KO mice were associated with red blood cell and protoporphyrin metabolism. Our results suggest that ALKBH8 facilitates changes in tRNA balance in conjunction with mcm5U, which are essential for normal red blood cell differentiation and embryogenesis in mice., Competing Interests: The authors declare no competing interests., (© 2024 The Author(s).)
- Published
- 2024
- Full Text
- View/download PDF
45. Global survey of hgcA-carrying genomes in marine and freshwater sediments: Insights into mercury methylation processes.
- Author
-
Wang YL, Ikuma K, Brown AMV, and Deonarine A
- Subjects
- Methylation, Methylmercury Compounds metabolism, Seawater chemistry, Seawater microbiology, Bacteria genetics, Bacteria metabolism, Metagenome, Geologic Sediments chemistry, Geologic Sediments microbiology, Mercury metabolism, Water Pollutants, Chemical metabolism, Fresh Water
- Abstract
Mercury (Hg) methylation is a microbially mediated process that produces methylmercury (MeHg), a bioaccumulative neurotoxin. A highly conserved gene pair, hgcAB, is required for Hg methylation, which provides a basis for identifying Hg methylators and evaluating their genomic composition. In this study, we conducted a large-scale omics analysis in which 281 metagenomic freshwater and marine sediment samples from 46 geographic locations across the globe were queried. Specific objectives were to examine the prevalence of Hg methylators, to identify horizontal gene transfer (HGT) events involving hgcAB within Hg methylator communities, and to identify associations between hgcAB and microbial biochemical functions/genes. Hg methylators from the phyla Desulfobacterota and Bacteroidota were dominant in both freshwater and marine sediments while Firmicutes and methanogens belonging to Euryarchaeota were identified only in freshwater sediments. Novel Hg methylators were found in the Phycisphaerae and Planctomycetia classes within the phylum Planctomycetota, including potential hgcA-carrying anammox metagenome-assembled genomes (MAGs) from Candidatus Brocadiia. HGT of hgcA and hgcB were identified in both freshwater and marine methylator communities. Spearman's correlation analysis of methylator genomes suggested that in addition to sulfide, thiosulfate, sulfite, and ammonia may be important parameters for Hg methylation processes in sediments. Overall, our results indicated that the biochemical drivers of Hg methylation vary between marine and freshwater sites, lending insight into the influence of environmental perturbances, such as a changing climate, on Hg methylation processes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
46. Unified control of diverse actions in a wastewater treatment activated sludge system using reinforcement learning for multi-objective optimization.
- Author
-
Croll HC, Ikuma K, Ong SK, and Sarkar S
- Subjects
- Wastewater, Models, Theoretical, Water Purification methods, Sewage, Waste Disposal, Fluid methods
- Abstract
The operation of modern wastewater treatment facilities is a balancing act in which a multitude of variables are controlled to achieve a wide range of objectives, many of which are conflicting. This is especially true within secondary activated sludge systems, where significant research and industry effort has been devoted to advance control optimization strategies, both domain-driven and data-driven. Among data-driven control strategies, reinforcement learning (RL) stands out for its ability to achieve better than human performance in complex environments. While RL has been applied to activated sludge process optimization in existing literature, these applications are typically limited in scope, and never for the control of more than three actions. Expanding the scope of RL control has the potential to increase the optimization potential while concurrently reducing the number of control systems that must be tuned and maintained by operations staff. This study examined several facets of the implementation of multi-action, multi-objective RL agents, namely how many actions a single agent could successfully control and what extent of environment data was necessary to train such agents. This study observed improved control optimization with increasing action scope, though control of waste activated sludge remains a challenge. Furthermore, agents were able to maintain a high level of performance under decreased observation scope, up to a point. When compared to baseline control of the Benchmark Simulation Model No. 1 (BSM1), an RL agent controlling seven individual actions improved the average BSM1 performance metric by 8.3 %, equivalent to an annual cost savings of $40,200 after accounting for the cost of additional sensors., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Henry Croll reports financial support was provided by Iowa Water Environment Association. Henry Croll reports financial support was provided by Iowa Wastewater and Waste-to-Energy Research Program. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
47. Non-mercury methylating microbial taxa are integral to understanding links between mercury methylation and elemental cycles in marine and freshwater sediments.
- Author
-
Wang YL, Ikuma K, Brooks SC, Varonka MS, and Deonarine A
- Subjects
- Geologic Sediments chemistry, Fresh Water, Methylation, Carbon, Sulfur, Sulfates analysis, Mercury analysis, Methylmercury Compounds analysis, Water Pollutants, Chemical analysis
- Abstract
The goal of this study was to explore the role of non-mercury (Hg) methylating taxa in mercury methylation and to identify potential links between elemental cycles and Hg methylation. Statistical approaches were utilized to investigate the microbial community and biochemical functions in relation to methylmercury (MeHg) concentrations in marine and freshwater sediments. Sediments were collected from the methylation zone (top 15 cm) in four Hg-contaminated sites. Both abiotic (e.g., sulfate, sulfide, iron, salinity, total organic matter, etc.) and biotic factors (e.g., hgcA, abundances of methylating and non-methylating taxa) were quantified. Random forest and stepwise regression were performed to assess whether non-methylating taxa were significantly associated with MeHg concentration. Co-occurrence and functional network analyses were constructed to explore associations between taxa by examining microbial community structure, composition, and biochemical functions across sites. Regression analysis showed that approximately 80% of the variability in sediment MeHg concentration was predicted by total mercury concentration, the abundances of Hg methylating taxa, and the abundances of the non-Hg methylating taxa. The co-occurrence networks identified Paludibacteraceae and Syntrophorhabdaceae as keystone non Hg methylating taxa in multiple sites, indicating the potential for syntrophic interactions with Hg methylators. Strong associations were also observed between methanogens and sulfate-reducing bacteria, which were likely symbiotic associations. The functional network results suggested that non-Hg methylating taxa play important roles in sulfur respiration, nitrogen respiration, and the carbon metabolism-related functions methylotrophy, methanotrophy, and chemoheterotrophy. Interestingly, keystone functions varied by site and did not involve carbon- and sulfur-related functions only. Our findings highlight associations between methylating and non-methylating taxa and sulfur, carbon, and nitrogen cycles in sediment methylation zones, with implications for predicting and understanding the impact of climate and land/sea use changes on Hg methylation., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
48. Continuous co-treatment of mine drainage with municipal wastewater.
- Author
-
Spellman CD, Burton ZT, Ikuma K, Strosnider WHJ, Tasker TL, Roman B, and Goodwill JE
- Subjects
- Waste Disposal, Fluid, Phosphates, Bioreactors, Wastewater, Sewage chemistry
- Abstract
Acid mine drainage (AMD) and municipal wastewater (MWW) are commonly co-occurring waste streams in mining regions. Co-treating AMD at existing wastewater facilities represents an innovative solution for simultaneous AMD reclamation and improved MWW treatment. However, unknowns related to biological processes and continuous treatment performance block full-scale use. The overarching goal of this work was to address questions related to efficacy and performance of continuous processing of AMD in a biological MWW treatment system. Synthetic AMD was co-treated with synthetic MWW in a continuously-operating bench-scale sequencing batch reactor (SBR). SBRs treated MWW with two strengths of AMD (91 and 720 mg/L as CaCO
3 Acidity) to capture the variations of coal AMD chemistry and strength observed in the field. Each co-treatment phases lasted 40+ days, during which clarified effluent and settled sludge quality was routinely monitored to determine impacts of co-treatment relative to conventional MWW treatment performance. Co-treatment produced effluent that met key standards for secondary treatment including biochemical oxygen demand (BOD) < 5 mg/L, total suspended solids (TSS) < 20 mg/L, and pH ∼7.0. Addition of AMD also improved treatment performance, increasing Phosphate (PO4 ) removal by >60% and pathogen removal by an order of magnitude. Furthermore, AMD co-treatment did not exhibit any major impacts on the overall diversity of the wastewater microbial community. Co-treatment sludge had slightly higher settleability and a lower bound water content, but notable changes in sludge morphology was observed. This study demonstrates co-treatment allows for continuous mitigation of AMD without adversely impacting MWW treatment performance in conventional biological MWW processes., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
49. Three dimensional printed biofilms: Fabrication, design and future biomedical and environmental applications.
- Author
-
Lazarus E, Meyer AS, Ikuma K, and Rivero IV
- Subjects
- Animals, Tissue Engineering, Printing, Three-Dimensional, Biofilms, Biodegradation, Environmental, Mammals, Bioprinting methods
- Abstract
Three dimensional printing has emerged as a widely acceptable strategy for the fabrication of mammalian cell laden constructs with complex microenvironments for tissue engineering and regenerative medicine. More recently 3D printed living materials containing microorganisms have been developed and matured into living biofilms. The potential for engineered 3D biofilms as in vitro models for biomedical applications, such as antimicrobial susceptibility testing, and environmental applications, such as bioleaching, bioremediation, and wastewater purification, is extensive but the need for an in-depth understanding of the structure-function relationship between the complex construct and the microorganism response still exists. This review discusses 3D printing fabrication methods for engineered biofilms with specific structural features. Next, it highlights the importance of bioink compositions and 3D bioarchitecture design. Finally, a brief overview of current and potential applications of 3D printed biofilms in environmental and biomedical fields is discussed., (© 2023 The Authors. Microbial Biotechnology published by Applied Microbiology International and John Wiley & Sons Ltd.)
- Published
- 2024
- Full Text
- View/download PDF
50. One-Week-Ahead Prediction of Cyanobacterial Harmful Algal Blooms in Iowa Lakes.
- Author
-
Villanueva P, Yang J, Radmer L, Liang X, Leung T, Ikuma K, Swanner ED, Howe A, and Lee J
- Subjects
- Lakes microbiology, Iowa, Harmful Algal Bloom, Cyanobacteria
- Abstract
Cyanobacterial harmful algal blooms (CyanoHABs) pose serious risks to inland water resources. Despite advancements in our understanding of associated environmental factors and modeling efforts, predicting CyanoHABs remains challenging. Leveraging an integrated water quality data collection effort in Iowa lakes, this study aimed to identify factors associated with hazardous microcystin levels and develop one-week-ahead predictive classification models. Using water samples from 38 Iowa lakes collected between 2018 and 2021, feature selection was conducted considering both linear and nonlinear properties. Subsequently, we developed three model types (Neural Network, XGBoost, and Logistic Regression) with different sampling strategies using the nine selected variables (mcyA_M, TKN, % hay/pasture, pH, mcyA_M:16S, % developed, DOC, dewpoint temperature, and ortho -P). Evaluation metrics demonstrated the strong performance of the Neural Network with oversampling (ROC-AUC 0.940, accuracy 0.861, sensitivity 0.857, specificity 0.857, LR+ 5.993, and 1/LR- 5.993), as well as the XGBoost with downsampling (ROC-AUC 0.944, accuracy 0.831, sensitivity 0.928, specificity 0.833, LR+ 5.557, and 1/LR- 11.569). This study exhibited the intricacies of modeling with limited data and class imbalances, underscoring the importance of continuous monitoring and data collection to improve predictive accuracy. Also, the methodologies employed can serve as meaningful references for researchers tackling similar challenges in diverse environments.
- Published
- 2023
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.