12 research outputs found
The First Mathematical Book in the Golden Horde State: A Masterpiece of Computational Mathematics (“et-Tuhfe fî ilmi’l-hisâb”) (1)
No full textThe author of this article represents the first example of the scientific activity in the Golden Horde, which began before Janibeg khan and during the reign of his father, Uzbek khan. The composition entitled “Masterpieces in Computational Science” (“et-Tuhfe fî ilmi’l-hisâb”), written in the Golden Horde on a mathematical topic, occupies a special place because of the information contained therein. This treatise, the contents of which will be described below, shows us the following: scientific activity in the Golden Horde, which began with the adoption of Islam, brought results in a short time and laid the foundations for the “breakthrough” during the reign of Janibeg khan.
In the future, the author plans to explore and learn the value of the text for the mathematical sciences from a historical point of view: the computational book “et-Tuhfe fî ilmi’l-hisâb”, whose author is unknown, was handed to the Crimean Governor and right hand’s bey, Ebul-Muzaffer Giyaseddin Tuluktemir bey, during the reign of Uzbek khan (1313–1342). After mentioning the distinguishing features of the work, the author will focus on the definition of numbers, which is attributed to Muhammad b. Musa Al-Khwarizmi, and which, at the moment, is not recorded in any other sources. The author will test ability to understand the evidence used in the calculation, surveying, and algebra, and will consider definitions regarding the theory of numbers. Subsequently, the author will analyze the formula of approximate values of square and cube roots of irrational numbers, proposed by Mohammed al-Khwarizmi, Abdulkadir al-Baghdadi, and a teacher of the author, Saduruddin al-Farazi.
In the first chapter, “Scientific and Philosophical Life in the Golden Horde State” (discussed in detail in this article), the author presents a brief description of the political, economic, and social life in the ulus of Jochi, to proceed to the consideration of the progress of scientific life developed in close connection with Islamic culture since the time of the formation of the Golden Horde. The author presents the writing under consideration in the context of this broad topic, briefly describing its contents. The purpose of this paper is to define scientific environment, which made possible the writing of the “et-Tuhfe fî ilmi’l-hisâb”
Re: Totally tubeless percutaneous nephrolithotomy: a prospective randomized controlled study
No full textPatient’s quality of life following open surgery and percutaneous nephrolithotomy for renal calculi: Short form-36 study
Get PDFIntroduction: The aim of the study is to evaluate and compare the long-term quality of life in patients operated for kidneystones with either open stone surgery or percutaneous nephrolithotomy (PNL). Materials and Methods: Sixty patients (30open surgery and 30 PNL) who have been operated were included in the study. Healthy group of 30 people was included asthe control group. Quality of life evaluation was done using the short form-36. Linear regression analysis, Chi-square test,and ANOVA tests were used for the analysis of the data. Results: The mean age of patients was 48.9, 48.6, and 49.1 yearsconsecutively in patients who underwent open renal stone surgery, PNL, and the control group (P > 0.05). Female to male ratiowas 13/17 in both the open surgery group and PNL while this ratio was 12/18 in the control group (P > 0.05). Quality of life scoreswas statistically found to be similar in the open surgery group and PNL group (P > 0.05). A decrease in all scores except mentalhealth with older ages was observed in patients who underwent either open or PNL surgery. The general health (GH) scorewas significantly less in the open surgery and PNL group when compared to the healthy control group. A significantly lowerphysical functioning, social role functioning, and role functioning score was observed in females. Conclusion: PNL and openstone surgery have similar long-term quality of life outcomes. Both of these surgical interventions cause a similar significantdecrease in the GH perception in patients
Ureteroscopy and pneumatic lithotripsy, followed by extracorporeal shock wave lithotripsy for the treatment of distal ureteral stones
No full textThe Effect of Varicocele Repair on Experimental Varicocele‐Induced Testicular Germ Cell Apoptosis
No full textThe purpose of this study was to evaluate the variance of apoptosis in rats in which experimental varicocele was induced and then treated by varicocelectomy. Forty adult male Wistar albino rats were used in this experimental study. Experimental varicocele was created in 30 rats. A total of 5 rats underwent a sham operation, and the remaining 5 rats were the control group. A total of 5 rats from the varicocele group were sacrificed on the 14th postoperative day, and 5 more were sacrificed on the 28th postoperative day to document the level of apoptosis due to varicocele. Varicocelectomy was performed on 20 rats with varicocele on the 14th postoperative day. These 20 rats were divided into 4 groups to evaluate the level of apoptosis in their testis after varicocelectomy. They were sacrificed on days 7, 14, 21, and 28 after varicocelectomy. The testes were fixated by perfusion with 10% formaldehyde and then placed in paraffin blocks. From each testis, 2 samples were stained with hematoxylin and eosin, and 2 samples were stained using the TUNEL method. In each specimen, apoptotic germ cells stained by TUNEL were counted in the cross section of 100 seminiferous tubules. The apoptotic index was defined by calculating the number of apoptotic cells per seminiferous tubule. Apoptotic index = total apoptotic germ cell count / 100. In the adult rats on which experimental varicocele was performed, both in the second and fourth week, apoptosis in both left and right testes were significantly higher compared with the control group (with varicocele day 14:0.25-0.26, with varicocele day 28:0.28-0.32, control: 0.11-0.13). After varicocelectomy on the 7th and 14th days, the slight increase in the level of apoptosis continued (day 7 left testis: 0.30, day 7 right testis: 028; day 14 left testis: 0.25, day 14 right testis: 0.31). After varicocelectomy, apoptosis decreased significantly on day 21 (left testis: 0.16, right testis: 0,22), and on day 28 it was almost equal to the level of the control group (left testis: 0.14, right testis: 0.16). After the creation of unilateral varicocele, the level of apoptosis increased in both the left and right testes. Apoptosis in both testes decreased after surgical treatment
The effect of smoking on spontaneous passage of distal ureteral stones
No full textBackground: Animal studies have shown that nicotine affects the peristalsis of the ureter. The aim of the study is to analyze the effect of smoking on spontaneous passage of distal ureteral stones. Methods: 88 patients in whom distal ureteral stone below 10 mm diameter diagnosed with helical computerized tomography enhanced images were reviewed. Patients were grouped as either smokers (n:33) or non smokers (n:50). Follow-up for spontaneous passage of stones was limited with 4 weeks. Patients did not receive any additional medical treatment other than non-steroid anti inflamatory drugs only during painful renal colic episodes. Two groups were compared with the chi-square test in terms of passing the stone or not. Stone passage was confirmed with either the patient collecting the stone during urination or by helical CT. Results: Smoking habits was present in 30(34%) patients and the frequency in both groups were similar (smokers: 23(76%) vs non-smokers: 46(79%)). Spontaneous passage of the stone was observed in 69(78%) patients. The two groups were comparable in terms of patien age, male to female ratio and stone size. Stone passage decreased as stone diameter increased. Total stone passage rates were similar in both groups (smokers: 76% vs. non-smokers: 79%) (p > 0.05). Passage of stones > 4 mm was observed in 46% and 67% of smokers and non-smokers respectively. However passage of stones with a diameter 0.05). Conclusion: Smoking has neither a favorable nor un-favorable effect on spontaneous passage of distal ureteral stones. However, spontaneous passage rates in patients with a stone diameter > 4 mm was lower in smokers. These results should be further confirmed with studies including larger numbers of patients
Urinary undiversion transforming an ileal conduit into an orthotopic continent neobladder: First case in our country
No full textSemirigid ureteroscopy: the effect of previous ipsilateral intraureteral manipulations on stone clearance
No full textWe investigated whether previous intraureteral manipulations had an effect on the stone-free rates (SFR) after semi-rigid ureteroscopy (URS) with pneumatic lithotripsy. A retrospective review of all patients who were treated for ureteral stones at two different institutions from June 2003 through January 2010 was performed. Data of 161 URS procedures were analyzed. Stone size, location (distal, mid and proximal) and number (single and multiple), patient demographics and previous intraureteral manipulations were recorded. Patients were grouped as having undergone a previous ipsilateral intraureteral manipulation (Group 1) or not (Group 2). Stone location and number, stone clearance and ancillary procedures were compared. There were no significant differences between Group 1 versus Group 2 for age (p > 0.05), gender (p > 0.05), stone site (p > 0.05) and stone size (p > 0.05). Stones with multiple locations were more frequent in Group 1 (18.5%); however, the difference did not reach statistical significance between the two groups. Similarly, the frequency of multiple stones was also higher in Group 1 (29.6%). Stone site, diameter and gender were comparable in both groups. Stone-free rate of all patients was 84.6% after the first intervention. This rate increased to 98.1% after secondary procedures. Univariate analysis revealed that SFR after URS were low in patients who underwent previous intraureteral manipulations (Group 1:55.6% vs. Group 2:89.1%). SFR after the first intervention were related with stone size, location and number. Additionally, multiple logistic regression analysis indicated a relationship between previous intraureteral manipulations and initial stone clearance rates. Spontaneous passage of stone fragments after URS was associated with stone burden, location, number and previous intraureteral manipulations. Further multiple logistic regression analysis showed that only previous intraureteral manipulations were associated with the expulsion of the stones left for passage
RecruitNet : A global database of plant recruitment networks
Get PDFPlant recruitment interactions (i.e., what recruits under what) shape the composition, diversity, and structure of plant communities. Despite the huge body of knowledge on the mechanisms underlying recruitment interactions among species, we still know little about the structure of the recruitment networks emerging in ecological communities. Modeling and analyzing the community-level structure of plant recruitment interactions as a complex network can provide relevant information on ecological and evolutionary processes acting both at the species and ecosystem levels. We report a data set containing 143 plant recruitment networks in 23 countries across five continents, including temperate and tropical ecosystems. Each network identifies the species under which another species recruits. All networks report the number of recruits (i.e., individuals) per species. The data set includes >850,000 recruiting individuals involved in 118,411 paired interactions among 3318 vascular plant species across the globe. The cover of canopy species and open ground is also provided. Three sampling protocols were used: (1) The Recruitment Network (RN) protocol (106 networks) focuses on interactions among established plants (“canopy species”) and plants in their early stages of recruitment (“recruit species”). A series of plots was delimited within a locality, and all the individuals recruiting and their canopy species were identified; (2) The paired Canopy-Open (pCO) protocol (26 networks) consists in locating a potential canopy plant and identifying recruiting individuals under the canopy and in a nearby open space of the same area; (3) The Georeferenced plot (GP) protocol (11 networks) consists in using information from georeferenced individual plants in large plots to infer canopy-recruit interactions. Some networks incorporate data for both herbs and woody species, whereas others focus exclusively on woody species. The location of each study site, geographical coordinates, country, locality, responsible author, sampling dates, sampling method, and life habits of both canopy and recruit species are provided. This database will allow researchers to test ecological, biogeographical, and evolutionary hypotheses related to plant recruitment interactions. There are no copyright restrictions on the data set; please cite this data paper when using these data in publications
Verdú et al.'s datasets on plant recruitment networks
No full textPlant recruitment interactions (i.e., who recruits under whom) shape the composition, diversity and structure of plant communities. Despite the huge body of knowledge on the mechanisms underlying recruitment interactions between species, we still know little about the structure of the recruitment networks emerging in ecological communities. Modeling and analyzing the community-level structure of plant recruitment interactions as a complex network can provide relevant information on ecological and evolutionary processes acting both at the species and ecosystem levels. We report a data set containing 143 plant recruitment networks in 23 countries across five continents, including temperate and tropical ecosystems. Each network identifies the species under which another species recruits. All networks report the number of recruits (i.e., individuals) per species. The data set includes >850,000 recruiting individuals involved in 118,411 paired interactions between 3,318 vascular plant species across the globe. The cover of canopy species and open ground is also provided as a separated file. Three sampling protocols were used: 1) The Recruitment Network (RN) protocol (106 networks) focuses on interactions between established plants (“canopy species”) and plants in their early stages of recruitment (”recruit species”). A series of plots are delimited within a locality and all the individuals recruiting and their canopy species are identified; 2) The paired Canopy-Open (pCO) protocol (26 networks) consists in locating a potential canopy plant and identifying recruiting individuals under the canopy and in a nearby open space of the same area; 3) The Georeferenced plot (GP) protocol (11 networks) consists in using information from georeferenced individual plants in large plots to infer canopy-recruit interactions. Some networks incorporate data for both herbs and woody species, while others focus exclusively on woody species. The location of each study site, geographical coordinates, country, locality, responsible author, sampling dates, sampling method and life habit of both canopy and recruit species are provided. This database will allow researchers to test ecological, biogeographical and evolutionary hypotheses related to plant recruitment interactions
