bluuebunny/crossref_metadata_2025 huggingface dataset:
The Periodontal Examination Profile of General Dentists in Nova Scotia, Canada
Authors: Ghiabi Edmond , Weerasinghe Swarna
Published: July 2010

Background: In this cross‐sectional study we investigate the extent to which general dentists in Nova Scotia carry out periodontal examinations of their patients. In addition, factors that significantly influence performing a periodontal examination by a dentist are identified.

Methods: A survey questionnaire was mailed to all 443 general dentists practicing in the province of Nova Scotia in the summer of 2009. The survey included questions on demographics and the various components of the periodontal examination. Simple and multiple logistic regression tests were used to analyze the results.

Results: Of the 279 (63%) responses received, 272 (61%) responses were eligible to be included in the analyses. The majority of responders (94.8%) reported performing periodontal examinations of their patients. However, only 37.8% and 43.3% of the dentists reported performing full‐mouth and selective probing depth measurements, respectively. Dentists who practiced in urban locations (P = 0.05), dentists whose practices were situated <5 km from a periodontist (P = 0.08), and dentists who planned to take a continuing education course in periodontal plastic surgery in the next 2 years (P = 0.07) were more likely to perform a periodontal examination.

Conclusions: Although the majority of dentists in our study report performing periodontal examinations of their patients, only a small portion report recording complete probing depth measurements or using appropriate radiographs in their examinations. These practices could lead to an underestimation of diagnosis and treatment of periodontal disease.
Biochar and the Nitrogen Cycle: Introduction
Authors: Clough Tim J. , Condron Leo M.
Published: July 2010

Nitrogen (N) is an essential nutrient, and research to date shows that biochar potentially has the ability to manipulate the rates of N cycling in soil systems by influencing nitrification rates and adsorption of ammonia and increasing NH4+ storage by enhancing cation exchange capacity in soils. Its influence on these processes may have further implications in terms of reducing gaseous N losses such as N2O and nitrate leaching. However, further detailed research is required to fully understand the transformation mechanisms and fate of N when associated with biochar treated soils. The three research papers that comprise this special collection of papers on biochar and the nitrogen cycle focus on biochar's diverse ability to influence N cycling processes. These papers show for the first time (i) how microbial nitrification communities and function differ with exposure to biochar, (ii) how the length of time the soil has been in contact with biochar influences N transformation and how this can vary with soil type, and (iii) how composting of organic materials with biochar can reduce N losses and enhance the nutrient status of the composted product. Considerable knowledge gaps still exist in terms of understanding the precise mechanisms through which biochar influences soil N transformations, and how biochar affects both plant and microbial N supply. The general direction that research on biochar should focus on with respect to the N cycle is the effect(s) that biochar has on N transformation in soils, both chemical and biological mechanisms, and the fate of N applied to biochar treated soils. This research needs to be performed at both field plot and microbial scales.
Erectile Dysfunction, Obesity, Insulin Resistance, and Their Relationship With Testosterone Levels in Eugonadal Patients in an Andrology Clinic Setting
Authors: Knoblovits Pablo , Costanzo Pablo R. , Valzacchi Gastón J. Rey , Gueglio Guillermo , Layus Alberto O. , Kozak Andrea E. , Balzaretti Marta I. , Litwak León E.
Published: July 2010

ABSTRACT: Erectile dysfunction (ED) is associated with metabolic and endocrine diseases including obesity, metabolic syndrome (MS), and type 2 diabetes mellitus (DM2). Insulin resistance (IR), present in patients with obesity, MS, and DM2, causes disturbances in the signaling pathways required for nitric oxide production, with subsequent endothelial dysfunction. In addition, IR appears to alter testosterone production. We evaluated in eugonadal patients with ED: 1) the presence of obesity and IR, 2) testosterone levels and their association with obesity and IR, and 3) the degree of ED according to the presence of IR. In a prospective study, 78 eugonadal patients with ED (group P) were recruited and compared with 17 men without ED as a control group (group C). Erectile function was evaluated according to the International Index of Erectile Function 5 (IIEF‐5). IR was measured by homeostasis model assessment (HOMA). IR was defined as HOMA of 3 or greater. Patients with ED had significantly higher body mass index (BMI), waist circumference (WC), HOMA values, and prevalence of IR when compared with group C. Total (TT) and bioavailable testosterone (BT) levels were lower in group P compared with group C. There was a significant negative correlation between HOMA and IIEF‐5, HOMA and TT, WC and IIEF‐5, WC and TT, and WC and BT. Group P patients with IR had higher WCs and lower IIEF‐5 scores when compared with patients in group P without IR. In conclusion, patients with ED showed a higher BMI, WC, and HOMA and lower levels of TT and BT. There is a negative correlation between erectile function and IR and abdominal obesity. The TT levels are lower in patients with increased BMI, WC, and IR. However, a negative correlation was shown only between BT (biologically active fraction) and abdominal obesity.
Salvaging Penile Venous Stripping Surgery
Authors: Hsu Geng‐Long , Chen Heng‐Shuen , Hsieh Cheng‐Hsing , Lee Wen‐Yuan , Chen Kuo‐Liang , Chang Chao‐Hsiang
Published: July 2010

ABSTRACT: Disappointing functional outcome and penile deformity are major concerns of penile venous surgery. Consequently, it has been abandoned by most urologists. To explore whether penile deformity is correctable and erectile function can be improved, we report our experience in patients who had undergone surgery elsewhere. From 1986 to 2008, 16 consecutive patients sought our assistance because of poorer erectile capability or/and penile deformity from previous venous surgery elsewhere. The abridged 5‐item version of the International Index of Erectile Function (IIEF‐5) was used to score the patients when it became available in 1998. Accordingly, 3 and 13 patients were categorized into the non‐IIEF and IIEF groups, respectively. A median longitudinal pubic incision and a circumferential or semicircumcision were made to relieve the fibrotic tissues for accessing the deep dorsal veins, which were stripped thoroughly and ligated with 6‐0 nylon sutures. The cavernosal veins were managed in a similar manner. The paraarterial veins were ligated only segmentally. Finally, the wound was approximated while an assistant consistently stretched the penile shaft. The operation time was 5.2 to 8.5 hours. The follow‐up period ranged from 0.6 to 23.0 years. Overall, all patients reported satisfactory penile morphology postoperatively. In the IIEF group, the difference in preoperative and postoperative scores was significant (P < .001). In the non‐IIEF group, 2 of the 3 patients reported natural coitus. This series of salvaging venous surgeries, although technically challenging, are helpful in correcting penile deformity and restoring erectile function in some patients who had poorer outcomes from prior venous surgeries.
Hereditary Behavior of Varicocele
Authors: Gökçe Ahmet , Davarci Mürsel , Yalçinkaya Fatih Rüştü , Güven Eşref Oğuz , Kaya Yusuf Selim , Helvaci Mehmet Rami , Balbay Mevlana Derya
Published: July 2010

ABSTRACT: The inheritance of varicoceles and the potential transmission to first‐degree relatives has rarely been investigated. In the present study, we examined the first‐degree relatives of men with known varicocele to reveal the familial risk for varicocele. Of the patients with clinical varicocele who presented with infertility, testicular pain, or asymmetrical swelling of the scrotum between June 1, 2008 and May 31, 2009, 49 agreed to have their available first‐degree relatives contacted for screening of varicoceles (n = 66). A cohort of 100 consecutive men who applied to the department of internal medicine between 2008 and 2009 for checkup procedure without a history of subfertility or a varicocele were used as a control population. Of the 92 first‐degree relatives contacted, 66 (71.7%) decided to participate in this study. Of these 66 men, 21 (33.9%) had a palpable varicocele on physical examination. Compared with a control population (12%), the prevalence of palpable varicocele in the first‐degree relatives of patients with known varicocele (33.9%) was approximately 3‐fold greater (P < .005). Among the first‐degree relatives, 4 (21.1%) of 19 fathers and 17 (36.2%) of 47 brothers had palpable varicocele. As a conclusion, a significant increase in varicocele prevalence is present in the first‐degree relatives of men with known varicoceles. Patients should be counseled about this increased risk in male relatives of patients.
The roles of p38mAPK and caspase-3 in dads-induced apoptosis in human HepG2 cells
Authors: Chunxiao Ji , Heng Ma , Ren Fenglian
Published: July 2010

The roles of p38MAPK and caspase-3 in DADS-induced apoptosis in human HepG2 cells were investigated. After the human HepG2 cells were treated with DADS, the cell viability, apoptosis and the activity changes of p38MAPK and caspase-3 were measured. The results indicated that DADS can activate p38MAPK and caspase-3. The results showed that p38MAPK and caspase-3 are involved in the process of DADS-induced apoptosis in human HepG2 cells and interact with each other.
Early and late tamoxifen resistance in breast cancer
Authors: Abu Rabi , Markicevic M. , Vujasinovic Tijana , Lukic Silvana , Stamatovic Ljiljana , Nikolic-Vukosavljevic Dragica
Published: July 2010

In our study we investigated the role of the estrogen receptor (ER), progesterone receptor (PR) and clinicohistological parameters in breast cancer patients treated with tamoxifen during the early (2.5 years) vs. late (2.5-5 years) follow-up. The negative status of both ER and PR and tumors equal to or bigger than 2 cm defined the phenotypes and consequently the groups of patients with the worst clinical course of the disease: ER-negative PR-negative, ER-negative pT2 and PR-negative pT2. These high-risk subgroups were related to early follow-up indicating de novo resistance. It is relevant to point out that examined predictive indicators did not show significant importance in the late follow-up study.
Pro12Ala gene polymorphism in the peroxisome proliferator-activated receptor gamma as a risk factor for the onset of type 2 diabetes mellitus in the Serbian population
Authors: Soskic Sanja , Stankovic Aleksandra , Djuric Tamara , Zivkovic Maja , Ristic P. , Andjelkovic Z. , Sumarac-Dumanovic Mirjana , Alavantic D.
Published: July 2010

The peroxisome proliferator-activated receptor gamma (PPAR?) is a gene candidate for the onset of type 2 diabetes mellitus (T2DM). We investigated the association of the PPAR? Pro12Ala gene with the onset of T2DM for the first time in the Serbian population. The study population consisted of 197 controls and 163 T2DM patients. The 12Ala allele tended to be more frequent in the group of T2DM patients (0.11) compared to the control subjects (0.09). The results from this study indicate that the PPAR?2 12Ala allele presents a non-significant risk factor for T2DM development in the Serbian population.
On the appendage regeneration of Eupolybothrus transsylvanicus (Latzel) (Chilopoda: Lithobiidae)
Authors: Mitic B.M. , Tomic V.T. , Makarov S.E. , Ilic B.S. , Curcic B.P.M.
Published: July 2010

We have analyzed and discussed the indirect evidence of regeneration of the forcipular telopodites and the walking legs (reduced in size or abnormal characteristics such as atypical morphology and a reduced number of articles) in wild populations of the lithobiomorph centipede Eupolybothrus transsylvanicus (Latzel). In our opinion, these morphological defects can be interpreted as a result of incomplete regeneration. In some cases, the full segmentation of the regenerating appendages will be completed later in ontogeny through an anamorphic schedule of post-embryonic segment addition.
Lithium modulates the chronic stress-induced effect on blood glucose level of male rats
Authors: Popovic Natasa , Pajovic Snezana
Published: July 2010

In the present study we examined gross changes in the mass of whole adrenal glands and that of the adrenal cortex, as well as the serum corticosterone and glucose level of mature male Wistar rats subjected to three different treatments: animals subjected to chronic restraint-stress, animals injected with lithium (Li) and chronically stressed rats treated with Li. Under all three conditions we observed hypertrophy of whole adrenals, as well as the adrenal cortices. Chronic restraint stress, solely or in combination with Li treatment, significantly elevated the corticosterone level, but did not change the blood glucose level. Animals treated only with Li exhibited an elevated serum corticosterone level and blood glucose level. The aim of our study was to investigate the modulation of the chronic stress-induced effect on the blood glucose level by lithium, as a possible mechanism of avoiding the damage caused by chronic stress. Our results showed that lithium is an agent of choice which may help to reduce stress-elevated corticosterone and replenish exhausted glucose storages in an organism.
Gibberellin influence on the morphogenesis of the moss Bryum argenteum Hedw. in in vitro conditions
Authors: Sabovljevic Aneta , Sabovljevic Marko , Grubisic D.
Published: July 2010

The moss Bryum argenteum Hedw. was treated with gibberellins as well as some inhibitors of gibberellin biosynthesis in order to investigate their influence on B. argenteum morphogenesis. Generally, gibberellins have not been chemically identified in bryophytes, while other groups of classical phytohormones (auxins, cytokinins, abscisic acid and ethylene) have been chemically identified in these plants. The in vitro culture of the moss Bryum argenteum was established from sterilized spores. The apical shoots of untreated gametophytes grown in vitro were used to investigate the influence of different substances on secondary protonema and on the growth and multiplication of the gametophytes. B. argenteum reacts differently to the growth regulators applied. Both gibberellins applied in vitro (GA3 and GA7) have a positive effect on B. argenteum morphogenesis. Shoot multiplication was negatively affected by three tested growth retardants (ancymidol, BX-112 and chlorocholine chloride), while these substances did not have such strong effects on the moss protonema development.
Bioactivity of Rumex obtusifolius (Polygonaceae)
Authors: Harshaw Diane , Nahar Lutfun , Vadla Brahmachari , Saif-E-Naser Gadria , Sarker Satyajit
Published: July 2010

Rumex obtusifolius L. (Polygonaceae), commonly known as 'broad-leaf dock', is one of the most common Irish wayside weeds, and it also occurs in silage fields, on river banks, in ditches and on waste grounds. The ethnobotanical uses of this species include its use as an antidote to nettle, depurative, astringent, laxative, and tonic, and in the treatment of sores, blisters, burns, cancer and tumors. The bioactivities of n-hexane, dichloromethane (DCM) and methanol (MeOH) extracts of the leaves of R. obtusifolius were assessed using the 2,2-Diphenyl-1-picrylhydrazyl (DPPH) assay, the newly developed micro-titer-based antimicrobial assay incorporating resazurin as an indicator of cell growth, and the brine shrimp lethality assay. The most potent free radical scavenging activity was displayed by the MeOH extract with a RC50 value of 7.80 x 10-2 mg/mL. Among the fractions obtained from solid-phase extraction (SPE) of the MeOH extract, the 50% aqueous methanolic SPE fraction exhibited the highest levels of free radical scavenging property (RC50 = 1.05 x 10-2 mg/mL). While the n-hexane extract did not show any antibacterial activity at test concentrations, the DCM extract was active only against Escherichia coli. However, the MeOH extract as well as the 50% and 80% SPE fractions of the MeOH extract showed significant antibacterial property against all bacterial strains tested. None of the extracts or fractions exhibited any significant toxicity towards brine shrimps.
Screening of some Malay medicated oils for antimicrobial activity
Authors: Khalid Khalisanni , Kiong Hung
Published: July 2010

Oils from six Malay medicated oils, used traditionally in the treatment of infectious and septic diseases in humans, were tested for their antimicrobial property. The aim was to evaluate the antimicrobial properties of six Malay medicated oils against certain microbial isolates. Locally available Malay medicated oils were checked for their antimicrobial activities using six species of bacteria: E. coli, Salmonella spp., Klebsiella pneumoniae, Staphylococcus aureus, Streptococcus, Bacillus subtilis and 2 fungi with 1 yeast (Aspergillus niger, Penicillum spp. and Candida albicans). Clove oil showed the highest antibacterial activity followed, respectively, by 'bunga merah', cajaput, nutmeg, lemon grass and 'gamat' oil. Clove oil and lemon grass showed anticandidal activity. The Malay medicated oil studies did not show any antifungal activity. The study shows that Malay medicated oils, like antibiotics, have antimicrobial activities against some microorganisms.
Male genitalia of the species of the subfamily Agathidinae (Hymenoptera: Braconidae) and their importance in taxonomy
Authors: Brajkovic M. , Stanisavljevic L. , Nikolic Z. , Curcic S.B. , Zivic Ivana , Stojanovic D.
Published: July 2010

A morphological analysis of the male genitalia of 24 species of the subfamily Agathidinae from 10 genera is presented. Detailed descriptions of important morphological features of all the species are given. Their value in the identification of the species was assessed. It was found that the morphology of male genitalia could be used for identification of the genera, while it was of limited value at the species level, except for those belonging to multispecific genera.
Morphological changes of the ovipositor in species of Cheloninae (Hymenoptera: Braconidae) in the course of adaptation to egg-larval parasitism
Authors: Brajkovic M. , Nikolic Z. , Curcic S.B. , Zivic Ivana , Stojanovic D.
Published: July 2010

Adaptation to the parasitic way of life in braconids has led to a number of consequences in the morphology of the ovipositor of females. As a derivative of the paired appendages of the eighth and ninth abdominal segments, the ovipositor is a complex morphological structure of gonapophysal origin whose muscular system makes possible highly complex movements during the act of egg-laying. In some groups of braconids, imaginal and egg-larval forms of parasitism have developed in the course of evolution. In adapting to these two forms of parasitism, the ovipositor underwent significant changes, while still remaining a successful structure for the paralyzation and laying of eggs in the host. This paper presents a survey of the ovipository apparatus structure in the species of the genera Ascogaster Wesmael, Leptodrepana Shaw, Chelonus Panzer, Microchelonus Szepligeti, and Phanerotoma Wesmael, and gives a review of the changes in structure of the ovipositor during adaptation to egg-larval parasitism.
Survival probabilities of first and second clutches of blackbird (Turdus merula) in an urban environment
Authors: Kurucz Kornelia , Kallenberger Helena , Szigeti Csilla , Purger J.J.
Published: July 2010

The breeding success of blackbirds was investigated in April and June 2008 and 2009 in the Botanical Garden of the University of Pecs, with a total of 50 artificial nests at each of the four sessions (with 1 quail egg and 1 plasticine egg placed in every nest). In all four study periods of the two years, 2 nests (4%) were destroyed by predators. Six nests (12%, of the nests) were not discovered in either of the cases. The survival probability of artificial nests was greater in April than in June (both years), but the difference was significant only in 2008. Nests placed into a curtain of ivy (Hedera helix) on a wall were located higher up than those in bushes, yet their predation rates were quite similar. The predation values of quail vs. plasticine eggs did not differ in 2008. In the year 2009, however, significantly more quail eggs were discovered (mostly removed), than plasticine eggs. Marks that were left on plasticine eggs originated mostly from small mammals and small-bodied birds, but the disappearance of a large number of quail and plasticine eggs was probably caused by larger birds, primarily jays.
Chthonius (Chthonius) onaei n. sp. (Chthoniidae, pseudoscorpiones), a new epigean species from Croatia
Authors: Curcic B.P.M. , Dimitrijevic R.N. , Radja T. , Curcic Nina , Milincic M.
Published: July 2010

A new epigean pseudoscorpion, Chthonius (Chthonius) onaei n. sp. is erected from Podaspilje, nr. Omis, Mt. Omiska Dinara, Dalmatia, Croatia. Its interrelations with two close congeners, Chthonius (C.) litoralis Hadzi, 1933 and Chthonius (C.) dalmatinus Hadzi, 1930 are briefly discussed.
On Roncus almissae n. sp., R. krupanjensis n. sp., and R. radji n. sp., three new pseudoscorpions (Pseudoscorpiones, Neobisiidae) from Croatia and Serbia, respectively
Authors: Curcic B.P.M. , Radja T. , Curcic S.B. , Curcic Nina
Published: July 2010

Three new species of the pseudoscorpion genus Roncus L. Koch (Neobisiidae) are described from Croatia (from nr. Omis, Dalmatia: R. almissae n. sp.) and Serbia (near the town of Krupanj, north-western Serbia, Lukica Pecina Cave and nr. Izvor: R. krupanjensis n. sp., and R. radji n. sp.), and their diagnostic characteristics are illustrated. Their interrelations with phenetically close congeners are analyzed; in addition, the presence/absence of microsetae proximal to the trichobothria eb and esb is established as an important taxonomic characteristic.
Variations of PM10 mass concentrations and correlations with other pollutants in Belgrade urban area
Authors: Joksic Jasminka , Radenkovic Mirjana , Cvetkovic Anka , Matic-Besarabic Snezana , Jovasevic-Stojanovic Milena , Bartonova Alena , Yttri Espen
Published: July 2010

In this paper, we present the PM10 levels measured at an urban residential background site in New Belgrade, in Omladinskih Brigada Street, at 15 m height (roof). The aerosol samples were collected using European standard sampler, in four seasonal campaigns conducted in autumn: Nov 13-Dec 03, 2007, winter: Feb 07-28, 2008, spring: May 06-28, 2008 and summer: July 17- August 15, 2008. The results were compared with PM10 mass concentrations measured with Horiba automatic station at street level, at the same sampling site and at three more sites within Belgrade municipal monitoring network. The results show that PM10 values in Belgrade urban area were high during autumn and winter campaigns (heating season) with a number of samples exceeding the 24-hr limit value of 50 mg m-3. On the roof station, maximum daily value was 209 mg m-3 measured in the autumn campaign, with 14 values out of 20 measurements exceeding the 24hr limit. In winter, 14 out of 19 measurements exceeded the limit, with maximum value 196 mg m-3. During the spring campaign, number of exceedances was three out of 22. All values during summer campaign were below 50 mg m-3. The roof station equipped with the European Standard instrument showed systematically higher values than the street-level automatic monitor. PM10 values at all sites followed the same trend. The highest concentrations at all monitoring sites were observed during the autumn, Nov 20-Nov 25, 2007 and winter, Feb 19-Feb 23, 2008.
Detour index of a class of unicyclic graphs
Authors: Xuli Qi , Zhou Bo
Published: July 2010

The detour index of a connected graph is defined as the sum of detour distances between all unordered pairs of vertices. We determine the n-vertex unicyclic graphs whose vertices on its unique cycle all have degree at least three with the first, the second and the third smallest and largest detour indices respectively for n ? 7. 2010 Mathematics Subject Classifications. 05C12, 05C35, 05C90. .
Quasiconformal harmonic mappings and close-to-convex domains
Authors: Kalaj David
Published: July 2010

Let f = h + ? be a univalent sense preserving harmonic mapping of the unit disk U onto a convex domain ?. It is proved that: for every a such that |a| < 1 (resp. |a| = 1) the mapping ?a = h + a? is an |a| quasiconformal (a univalent) close-to-convex harmonic mapping. This gives an answer to a question posed by Chuaqui and Hern?ndez (J. Math. Anal. Appl. (2007)). 2010 Mathematics Subject Classifications. Primary 30C55, Secondary 31C05. .
Subordination and superordination results for the family of Jung-Kim-Srivastava integral operators
Authors: Sun Yong , Kuang Wei-Ping , Liu Zhi-Hong
Published: July 2010

In this paper, we derive some subordination and superordination results associated with the family of Jung-Kim-Srivastava integral operators defined on the space of meromorphic functions. Several sandwich-type results are also obtained. 2010 Mathematics Subject Classifications. Primary 30C45; Secondary 30C80. .
Warped product CR-submanifolds of LP-cosymplectic manifolds
Authors: Uddin Siraj
Published: July 2010

In this paper, we study warped product CR-submanifolds of LP-cosymplectic manifolds. We have shown that the warped product of the type M = NT ? fN? does not exist, where NT and N? are invariant and anti-invariant submanifolds of an LP-cosymplectic manifold M?, respectively. Also, we have obtained a characterization result for a CR-submanifold to be locally a CR-warped product. 2010 Mathematics Subject Classifications. 53C15, 53C40, 53C42. .
(I , γ)-generalized semi-closed sets in topological spaces
Authors: Devi R. , Selvakumar A. , Vigneshwaran M.
Published: July 2010

In this paper we introduce (I , ?)-generalized semi-closed sets in topological spaces and also introduce ?S - TI-spaces and investigate some of their properties. 2010 Mathematics Subject Classifications. 54B05, 54C08, 54D05. .
Moment decay rates of stochastic differential equations with time-varying delay
Authors: Jankovic Svetlana , Pavlovic Gorica
Published: July 2010

One of the most important questions, especially in applications, is how to choose a decay function in the study of stability for a concrete equation. Motivated by the fact that the coefficients of the considered equation mainly suggest the choice of the decay function, the point of analysis in the paper is to carry out the Lyapunov function approach and to state coercivity conditions dependent on decay in the study of the pth moment stability with a general decay rate for a certain stochastic differential equation with variable time delay. Some criteria including the usual exponential decay are discussed, particularly the ones with a concave decay, special cases of which are polynomial and logarithmic decays. Some consequences and examples are given to illustrate the theory. 2010 Mathematics Subject Classification. 60H10, 60H35. .
New bounds for the Cebysev functional of two functions of selfadjoint operators in Hilbert spaces
Authors: Dragomir S.S.
Published: July 2010

Some new inequalities for the Cebysev functional of two functions of selfadjoint linear operators in Hilbert spaces, under suitable assumptions for the involved functions and operators, are given. 2010 Mathematics Subject Classifications. 47A63; 47A99. .
On compact operators on some spaces related to matrix B(r, s)
Authors: Djolovic Ivana
Published: July 2010

Many sequence spaces arise from different concepts of summability. Recent results obtained by Altay, Ba?ar and Malkowsky [2] are related to strong Cesaro summability and boundedness. They determined ?-duals of the new sequence spaces and characterized some classes of matrix transformations on them. Here, we will present new results supplementing their research with the characterization of classes of compact operators on those spaces. 2010 Mathematics Subject Classifications. 46B15, 46B45, 46B50. .
On stochastic integrodifferential equations via non-linear integral contractors II
Authors: Jovanovic Miljana , Jankovic Svetlana
Published: July 2010

The present paper represents a continuation of paper [4], in which the existence and uniqueness problems for a general Ito-Volterra integrodifferential equation are investigated by using the concept of a non-linear random integral contractor. Since the Lipschitz condition and the random integral contractor for the coefficients of the considered equation, in general, cannot be compared, the notions of the modified Lipschitz condition and modified integral contractor are introduced on some function spaces, as well as the conditions of their equivalence. Some existence and uniqueness theorems are also given. 2010 Mathematics Subject Classifications. 60H20. .
Asymptotic curvature bounds for conformally flat metrics on the plane
Authors: Mateljevic Miodrag , Anic Ivan , Taylor Stephen
Published: July 2010

The decay rate of the Gauss curvature of conformally flat planer surfaces of strictly negative curvature is studied. It is show that generically there is an asymptotic sequence that decays faster than quadratically in the distance from the origin. In the case that the conformal factor is of finite order, it is shown that one can improve this decay rate. 2010 Mathematics Subject Classifications. 53C21, 31A05. .
Some generalizations of the Jacobsthal numbers
Authors: Djordjevic Gospava
Published: July 2010

The main object of this paper is to introduce and investigate some proper- ties and relations involving sequences of numbers Fn,m(r), for m = 2, 3, 4, and r is some real number. These sequences are generalizations of the Jacobsthal and Jacobsthal Lucas numbers. 2010 Mathematics Subject Classifications. 33C45, 33C47. .
EAF slag in self-compacting concretes
Authors: Tomasiello Stefania , Felitti Matteo
Published: July 2010

Self-compacting concrete (SCC) captures a growing interest because of its several advantages in technical, economic and environmental terms. Especially the attention for the environmental aspects moves the research towards recycling industrial by-products, as fly ash and steel slag. In particular, there are few experimental works about the use of EAF slag in SCC. This paper summarizes the first results of an ongoing experimental work to investigate the use of EAF slag in SCC as medium aggregate.
Durability design of concrete structures, Part 2: Modelling and structural assessment
Authors: Folic Radomir , Zenunovic Damir
Published: July 2010

This paper is a sequel to [19] where the theoretical foundations were given for the analysis of durability of concrete structures. An overview of some approaches to modeling the durability of RC structures is given in the paper. Experiences resulting from experimental and numerical research of some influential parameters leading to corrosion of the reinforcement, cracks and delaminating of the surrounding concrete, which leads to the decrease of service life of the RC structure's elements, are described in details. Methodologies of structure evaluation presented in this paper are based on assessment of critical influential parameters and represent a methodology of reasonable maintenance of an engineering construction, i.e. reasonable service life of the structure. The methods are based on analysis of conditions and performance (Condition Rating Method and Performance Rating Method). The results of ratings of concrete structures in the industrial zone of the city of Tuzla are presented in the final part of the paper.
Mathematical modeling of materially nonlinear problems in structural analyses, Part I: Theoretical fundamentals
Authors: Bonic Zoran , Prolovic Verka , Mladenovic Biljana
Published: July 2010

Material models describe the way they behave when loaded. The paper presents the development of the model beginning with the simplest linear-elastic and rigid-plastic ones. The basic data in the plasticity theory have been defined, such as criterion and yield (failure) surface, hardening law, plastic yield law and normality condition. Yield criteria of Tresca, Von Mises, Mohr-Coulomb and Drucker-Prager were given separately.
Influence of crushed stone aggregate type on concrete consistency
Authors: Toplicic-Curcic Gordana , Grdic Zoran , Despotovic Iva , Ristic Nenad
Published: July 2010

The main reason for usage of crushed stone mineral aggregate is need for concrete construction building with care about environmental protection, water resources, etc. Influence of crushed stone mineral aggregate on concrete consistency is considered in this paper. River aggregate is used as a benchmark, and from crushed aggregates: limestone, andesite, diabase and basalt. The drawn conclusion is that fine crushed aggregate has an important influence on concrete consistency because it decreases concrete's workability and placing. Replacement with river aggregate improves concrete consistency. Coarse aggregate type also has an influence on consistency. Further investigations should be based on possibility of fine crushed aggregate usage for SCC production.
A comparative theoretical-experimental analysis of settlements of shallow foundations on granular soil
Authors: Davidovic Nebojsa , Bonic Zoran , Prolovic Verka , Mladenovic Biljana , Stojic Dragoslav
Published: July 2010

The paper presents a brief description of experiment within the research project 'Theoretical and experimental analysis of interaction of shallow reinforced concrete foundations and soil for the purpose of improvement of national regulations and implementaation of Eurocode system' where in situ tests of a series of reinforced concrete foundation footing were performed, by loading until failure. As a rule, methods for calculation of shallow foundations settlement on granular soils overestimate the expected settlement, and underestimate soil bearing capacity, which results in a conservative foundation design. In order to test accuracy and reliability of the different settlements prediction methods, a comparative analysis of settlements calculated using these methods and those measured during experiment, was performed.
Frost resistance of concrete with crushed brick as aggregate
Authors: Jankovic Ksenija , Bojovic Dragan , Nikolic Dragan , Loncar Ljiljana , Romakov Zoran
Published: July 2010

The investigation included concrete made by using recycled brick as aggregate. Experimental work included several types of concrete made with the same cement content (385 kg/m3), and same consistency (slump about 1 cm). Recycled brick and combination of natural river aggregate and recycled brick were used as aggregates. The influence of percentage and grain size of crushed brick aggregate on concrete compressive strength, water absorption and frost resistance were observed. On the basis of the results obtained during experimental research, a general conclusion can be drawn that the application of recycled concrete as aggregate can lead to new composites with satisfactory physical-mechanical properties.
Comparison of some empirical equations for estimating daily reference evapotranspiration
Authors: Trajkovic Slavisa , Gocic Milan
Published: July 2010

In this paper, results of certain empirical equations for estimating the daily reference evapotranspiration for the area of southern Italy have been given. Evaluation of the daily values of evapotranspiration of Policoro was conducted by the following equations: FAO-56Penman-Monteith (FAOPM), FAO-24 Penman (FAOPn), FAO-24 Blaney-Criddle (FAOBC), FAO-24 Radiation (FAOR), FAO-24 Pan, Priestley-Tailor (PT) and Hargreaves (HARG). The results strongly support the use of the FAO-24 pan and FAO-56 Penman-Monteith equations for the calculation of daily reference evapotranspiration at the location of Policoro.
Theoretical-experimental static and dynamic analysis of double layered catenary
Authors: Vlajic Ljubomir , Kostic Dragan
Published: July 2010

The paper presents the results of static and dynamic tests of double layered catenary of the swimming pool building roof in Leskovac. By the comparison of measured and calculated values, a potential was created to correct the mathematical model, and to verify it. Only then, the calculation model for all sorts of static and dynamic load was able to simulate the realistic behavior of the structure. In this paper, the authors presented the basic recommendations in terms of what initial tensile force should be adopted in order to control the stability of such very cost-effective girders.
Methodology for assessing probability of extreme hydrologic events coincidence
Authors: Prohaska Stevan , Blagojevic Borislava , Ilic Aleksandra
Published: July 2010

The aim of the presented research is improvement of methodology for probability calculation of coinciding occurrence of historic floods and droughts in the same year. The original procedure was developed in order to determine the occurrence probability of such an extreme historic event. There are two phases in calculation procedure for assessment of both extreme drought and flood occurrence probability in the same year. In the first phase outliers are detected as indicators of extreme events, their return periods are calculated and series' statistics adjusted. In the second phase conditional probabilities are calculated: empirical points are plotted, and both extreme drought and flood occurrence probability in the same year is assessed based on the plot. Outlier detection is performed for the territory of Serbia. Results are shown as maps of regions (basins) prone to floods, hydrologic drought, or both. Step-by-step numeric example is given for assessing conditional probability of occurrence of flood and drought for GS Raska on the river Raska. Results of assessment of conditional probability in two more cases are given for combination of extreme flood and 30 day minimum flow.
Redistribution of the influences in systems with semi-rigid joints on elastic foundations
Authors: Zlatkov Dragan , Zdravkovic Slavko , Mijalkovic Marina , Mladenovic Biljana , Igic Tomislav
Published: July 2010

Most often, in the case of typefied prefabricated systems, foundations are designed and constructed as prefabricated elements as well. When the structure is exposed to high intensity loading and founded on a weak soil, beam foundations are often used instead of pad foundations. Beam foundations, stiffening girders, as well as beams which support the fa?ade elements or partition walls, are treated as beams on elastic foundations, while joint of these girders to pad foundations or vertical support elements of a precast structure can be treated as semi-rigid. Modeling of systems with semi-rigid joints on elastic foundations, for different levels of rigidity of connections, is illustrated by an example of a frame under static loading. On the basis of the results of the calculation carried out in this paper, it is evident that taking into account the elastic foundations of the member and the corresponding degree of fixation of the member on this foundations significantly affects the magnitude of the forces in the cross-sections of the member, and on the redistribution of influences in the entire structure. Yet, the foundations-and-soil interaction exerted the highest influence on the magnitude of the stress in the foundation structure itself.
Designing of support zones of concrete bridges to withstand action of static and dynamic load
Authors: Gligorijevic Milan , Zdravkovic Slavko , Spasojevic-Surdilovic Marija
Published: July 2010

In the paper are presented some of the acquired experiences in designing and construction of bridge structures in several countries, with a special attention to the analysis of support zones and expansion joints behavior of a number of road bridges. During destruction or damage of bridges, there is a small probability, but still there, that the human lives might be endangered (Kobe, Japan 17th January 1995); what is likely, however, is that it will be very difficult to help the injured in the region. Considering that the characteristics of removal of supports has a great influence on the behavior of the entire bridge structure, the design of support joints and connections must be paid due attention. In the recent decades, efforts are made to enhance research of all engineering structure, and thus the bridge structures and their weak points.
Stability design of structures with semi-rigid connections
Authors: Igic Tomislav , Zdravkovic Slavko , Zlatkov Dragan , Zivkovic Srdjan , Stojic Nikola
Published: July 2010

The paper points out to the differences of the First order theory and Second order theory and of the significance in practical calculations. The paper presents theoretical foundations and expressions of calculations of impacts on the stability of structure, that is, review of the Second order theory in a bridge with members semi-rigid connections in joints. In the real structures in general and the especially in the prefabricated structures the connection of members in the nodes can be partially rigid which can be very significant for the changes in tension and deformation. If the influence of the normal forces is significant and the structure is slender then it is necessary to carry out a calculation according to the Second order theory because the balance between internal and external forces really established on the deformed configuration and displacements in strict formation are also unreal. The importance and significance of the calculations and distribution of impact according to the Second order theory were presented in numerical examples as well as the calculation of critical load as well as the buckling length of members with semi-rigid connections in joint.
Second life as technological narrative: Dandellion/@ Kimban: A story of a virtual world
Authors: Petkovska Sanja
Published: July 2010

The spaces of virtual world contain mythological contents from different social and cultural-historical periods, creating a new way of existing and acting of contemporary individual and society, as well as a way to interpret them. The world created in three dimensions called Second Life is crawled both by mythological symbols and postmodern fluidity, generating a special social and psychological sphere. In this survey we will give a short presentation of the Second Life phenomenology, starting with its structure, and then explaining its relation to the real world and to the mode in which traditional cultural elements are presented there. The case study of dandellion/@ Kimban will be used as an illustration of this digital imitation of life given in three-dimensional online role plays and of object modulation.
The Medial Amygdalar Nucleus: A Novel Glucose-Sensing Region That Modulates the Counterregulatory Response to Hypoglycemia
Authors: Zhou Ligang , Podolsky Nina , Sang Zhen , Ding Yuyan , Fan Xiaoning , Tong Qingchun , Levin Barry E. , McCrimmon Rory J.
Published: July 2010

OBJECTIVE

To determine whether the medial amygdalar nucleus (MAN) represents a novel brain glucose-sensing region involved in the detection of hypoglycemia and generation of a counterregulatory hormone response.

RESEARCH DESIGN AND METHODS

Fura-2 calcium imaging was used to assess glucose responsivity in neurons isolated from the MAN and single-cell real-time reverse transcription PCR used to examine gene expression within glucose-responsive neurons. In vivo studies with local MAN perfusion of the glucoprivic agent, 2-deoxyglucose (2-DG), under normal and hypoglycemic conditions and also after MAN lesioning with ibotenic acid, were used to examine the functional role of MAN glucose sensors. In addition, retrograde neuronal tracer studies were used to examine reciprocal pathways between the MAN and the ventromedial hypothalamus (VMH).

RESULTS

The MAN contains a population of glucose-sensing neurons (13.5%), which express glucokinase, and the selective urocortin 3 (UCN3) receptor CRH-R2, but not UCN3 itself. Lesioning the MAN suppressed, whereas 2-DG infusion amplified, the counterregulatory response to hyperinsulinemic hypoglycemia in vivo. However, 2-DG infusion to the MAN or VMH under normoglycemic conditions had no systemic effect. The VMH is innervated by UCN3 neurons that arise mainly from the MAN, and ∼1/3 of MAN UCN3 neurons are active during mild hypoglycemia.

CONCLUSIONS

The MAN represents a novel limbic glucose-sensing region that contains characteristic glucokinase-expressing glucose-sensing neurons that respond directly to manipulations of glucose availability both in vitro and in vivo. Moreover, UCN3 neurons may provide feedback inhibitory regulation of the counterregulatory response through actions within the VMH and the MAN.
Calcium Dobesilate Inhibits the Alterations in Tight Junction Proteins and Leukocyte Adhesion to Retinal Endothelial Cells Induced by Diabetes
Authors: Leal Ermelindo C. , Martins João , Voabil Paula , Liberal Joana , Chiavaroli Carlo , Bauer Jacques , Cunha-Vaz José , Ambrósio António F.
Published: July 2010

OBJECTIVE

Calcium dobesilate (CaD) has been used in the treatment of diabetic retinopathy in the last decades, but its mechanisms of action are not elucidated. CaD is able to correct the excessive vascular permeability in the retina of diabetic patients and in experimental diabetes. We investigated the molecular and cellular mechanisms underlying the protective effects of CaD against the increase in blood–retinal barrier (BRB) permeability induced by diabetes.

RESEARCH DESIGN AND METHODS

Wistar rats were divided into three groups: controls, streptozotocin-induced diabetic rats, and diabetic rats treated with CaD. The BRB breakdown was evaluated using Evans blue. The content or distribution of tight junction proteins (occludin, claudin-5, and zonula occluden-1 [ZO-1]), intercellular adhesion molecule-1 (ICAM-1), and p38 mitogen-activated protein kinase (p38 MAPK) was evaluated by Western blotting and immunohistochemistry. Leukocyte adhesion was evaluated in retinal vessels and in vitro. Oxidative stress was evaluated by the detection of oxidized carbonyls and tyrosine nitration. NF-κB activation was measured by enzyme-linked immunosorbent assay.

RESULTS

Diabetes increased the BRB permeability and retinal thickness. Diabetes also decreased occludin and claudin-5 levels and altered the distribution of ZO-1 and occludin in retinal vessels. These changes were inhibited by CaD treatment. CaD also inhibited the increase in leukocyte adhesion to retinal vessels or endothelial cells and in ICAM-1 levels, induced by diabetes or elevated glucose. Moreover, CaD decreased oxidative stress and p38 MAPK and NF-κB activation caused by diabetes.

CONCLUSIONS

CaD prevents the BRB breakdown induced by diabetes, by restoring tight junction protein levels and organization and decreasing leukocyte adhesion to retinal vessels. The protective effects of CaD are likely to involve the inhibition of p38 MAPK and NF-κB activation, possibly through the inhibition of oxidative/nitrosative stress.