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Articles 207601 - 207630 of 5206074

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Effect Of Cumulus Cell Co-Culture And Protein Supplement On Success Of In Vitro Fertilization And Development Of Pre-Implanted Embryos In Mice, Muhammad-Baqir M-R. Fakhrildin, Institute For Embryo Research And Infertility Treatment, University Of Baghdad, Baghdad, Iraq Apr 2025

Effect Of Cumulus Cell Co-Culture And Protein Supplement On Success Of In Vitro Fertilization And Development Of Pre-Implanted Embryos In Mice, Muhammad-Baqir M-R. Fakhrildin, Institute For Embryo Research And Infertility Treatment, University Of Baghdad, Baghdad, Iraq

Sultan Qaboos University Journal For Science

Successful oocyte fertilization and normal embryonic development of mice were considered the most important diagnostic criteria for the safety of materials and tools used for human in vitro fertilization and embryo transfer (IVF-ET). Therefore, we studied the influence of cumulus cells co-culture and protein supplement within culture medium on percentages of in vitro fertilization (IVF) and normal development of early stages of mouse embryo later. Oocytes were collected and treated with hyaluronidase to remove cumulus cells. Oocytes were divided into four groups namely: Group-1: Oocytes incubated within modified Earl’s medium (MEM) supplied with 10% inactivated bovine amniotic fluid as a …

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Circulating Hormone Levels In Hatchlings Of Green Turtle, Chelonia Mydas, From Ras Al-Hadd Reserve, Oman, A. Y. A. Alkindi Apr 2025

Circulating Hormone Levels In Hatchlings Of Green Turtle, Chelonia Mydas, From Ras Al-Hadd Reserve, Oman, A. Y. A. Alkindi

Sultan Qaboos University Journal For Science

Post-hatching levels of plasma estradiol (E2), Progesterone (Pro), testosterone (T), Luteinizing Hormone (LH), Follicle-Stimulating Hormone (FSH) and thyroxine (T4) were monitored in hatchlings of Green Turtle, Chelonia mydas immediately after emergence. Eggs were collected at random from 5 nests. The eggs were placed in incubators 16 hr after oviposition set at 26-27oC for male producing hatchlings and at 30-31oC for female producing hatchlings. Blood was collected after sacrifice. Chemiluminescence immunoassay was used for determination of plasma hormone levels, using Beckman Coulter Access-2-immunoassay and reagents (Beckman Coulter, Inc.). Sex was determined from histological examination of gonads. In males, plasma T levels …

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Conditional Fault-Diameter Of Torus Networks, Abderezak Touzene, Khaled Day Apr 2025

Conditional Fault-Diameter Of Torus Networks, Abderezak Touzene, Khaled Day

Sultan Qaboos University Journal For Science

We obtain the conditional fault-diameter of the square torus interconnection network under the condition of forbidden faulty sets (i.e. assuming that each non-faulty processor has at least one non-faulty neighbor). We show that under this condition, the square torus, whose connectivity is 4, can tolerate up to 5 faulty nodes without becoming disconnected. The conditional node connectivity is, therefore, 6. We also show that the conditional fault-diameter of the square torus is equal to the fault-free diameter plus two. With this result the torus joins a group of interconnection networks (including the hypercube and the star-graph) whose conditional fault-diameter has …

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The Conditional Fault-Diameter Of The K-Ary N-Cube, Khaled Day, Abderezak Touzene Apr 2025

The Conditional Fault-Diameter Of The K-Ary N-Cube, Khaled Day, Abderezak Touzene

Sultan Qaboos University Journal For Science

We obtain the conditional fault diameter of the k-ary n-cube interconnection network. It has been previously shown that under the condition of forbidden faulty sets (i.e. assuming each non-faulty node has at least one non-faulty neighbor), the k-ary n-cube, whose connectivity is 2n, can tolerate up to 4n-3 faulty nodes without becoming disconnected. We extend this result by showing that the conditional fault-diameter of the k-ary n-cube is equal to the fault-free diameter plus two. This means that if there are at most 4n-3 faulty nodes in the k-ary n-cube and if every non-faulty node has at least one non-faulty …

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Realization In Generalized State Space Form For 2-D Polynomial System Matrices, M.S. Boudellioua, B. Chentouf Apr 2025

Realization In Generalized State Space Form For 2-D Polynomial System Matrices, M.S. Boudellioua, B. Chentouf

Sultan Qaboos University Journal For Science

In this paper, a direct realization procedure is presented that brings a general 2-D polynomial system matrix to generalized state space (GSS) form, such that all the relevant properties including the zero structure of the system matrix are retained. It is shown that the transformation linking the original 2-D polynomial system matrix with its associated GSS form is zero coprime system equivalence. The exact nature of the resulting system matrix in GSS form and the transformation involved are established.

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The Performance Of Step-Wise Group Screening Designs, M.M. Manene, Simwa Simwa Apr 2025

The Performance Of Step-Wise Group Screening Designs, M.M. Manene, Simwa Simwa

Sultan Qaboos University Journal For Science

In this paper we evaluate the performance of step-wise group screening designs in which group-factors contain an equal number of factors in the initial step. A usual assumption in group screening designs is that the directions of possible effects are known a-priori. In practice, however, this assumption is unreasonable. We shall examine step-wise group screening designs without errors in observations when this assumption is relaxed. We shall consider cancellations of effects within group-factors. The performance of step-wise group-screening designs shall then be compared with the performance of multistage group screening designs.

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Employment Of Some Parameters To Enhance Laser-Drilling Of Aluminum, Oday A. Hamadi Apr 2025

Employment Of Some Parameters To Enhance Laser-Drilling Of Aluminum, Oday A. Hamadi

Sultan Qaboos University Journal For Science

In this work, some parameters affecting drilling of aluminum samples by a pulsed Nd:YAG laser were studied. These parameters are multi-pulses irradiation, controlling sample temperature, low-pressure ambient and application of electric field on the sample. Results presented in this work explained that these parameters can enhance drilling process throughout increasing hole depth in aluminum samples at the same laser energy used for irradiation.

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Thermal Effects On The Body Mass, Transpiration Rate, Feeding And Food Conversion Of The Pillbug Armadillo Officinalis (Isopoda, Oniscidea) Fed On The Dry Leaf Of Punica Granatum, Abdelgader K. Youssef, Achuthan Nair Apr 2025

Thermal Effects On The Body Mass, Transpiration Rate, Feeding And Food Conversion Of The Pillbug Armadillo Officinalis (Isopoda, Oniscidea) Fed On The Dry Leaf Of Punica Granatum, Abdelgader K. Youssef, Achuthan Nair

Sultan Qaboos University Journal For Science

Observations were made on the body mass; transpiration rate; assimilation efficiency; gross and net production efficiencies; feeding, assimilation, conversion and metabolic rates of the pillbug Armadillo officinalis Dumeril acclimatized at 14º and 21 °C for 15 days and fed on the dry leaf of Punica granatum (Pomegranate). A brief description is given on the chemical composition of P. granatum leaf. The difference in body mass increments of A. officinalis between the acclimatized temperatures was not significant (t = 1.09; p>0.05). However, significant differences were discernible on the transpiration rate (t = 9.53; p<0.01), moisture (t = 9.01; p<0.01), assimilation efficiency (t = 5.16; p<0.01), feeding (t = 3.76; p<0.05) and conversion (t = 2.58; p<0.05) rates between the woodlice acclimatized at 14º and 21 °C. Better feeding of P. granatum leaf by these animals was observed at 21° C, but better assimilation efficiency at 14 °C. Only 3.21% assimilated food at 14° C and 6.30% at 21 °C were converted into the production of new tissues. The food consumption of A. officinalis at 14º and 21° C was 2.05% and 3.79% body mass/day respectively. The effect of temperature on the activity of A. officinalis in the field is discussed.

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Isolation Of Aristolochic Acids From Aristolochia Bracteolata And Studies Of Their Antioxidant Activities, Saleh Al-Busafi, Munir Al-Harthi, Bushra Al-Sabahi Apr 2025

Isolation Of Aristolochic Acids From Aristolochia Bracteolata And Studies Of Their Antioxidant Activities, Saleh Al-Busafi, Munir Al-Harthi, Bushra Al-Sabahi

Sultan Qaboos University Journal For Science

The isolation and structural elucidation of aristolochic acid-A and aristolochic acid-D from Omani Aristolochia bracteolata plant is reported. Antioxidant activities of these two natural products were evaluated for their capacity to reduce Mo(VI) to Mo(V). The study revealed that aristolochic acid-D is more active than vitamin C while aristolochic acid-A has activity similar to vitamin C.

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Xanthotoxin And Other Furanocoumarins As Phytoalexins In Pastinaca Sativa L. Roots, Fatma M. Al-Barwani, Elsadig A. Eltayeb Apr 2025

Xanthotoxin And Other Furanocoumarins As Phytoalexins In Pastinaca Sativa L. Roots, Fatma M. Al-Barwani, Elsadig A. Eltayeb

Sultan Qaboos University Journal For Science

Our results confirm the presence of the furanocoumarins psoralen, xanthotoxin, isopimpinellin, angelicin and bergapten as normal constituents of Pastinaca sativa roots. However, the amounts of these compounds were increased in induced roots. The amount of increase in the induced roots varied depending on the inducing agent and time of incubation. In addition the results show for the first time the presence of pimpinellin and isobergapten as constitutive antifungal compounds in P. sativa roots.

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Solution Of A Nonlinear Functional Equation, Valery C. Covachev, H. Ali Yurtsever Apr 2025

Solution Of A Nonlinear Functional Equation, Valery C. Covachev, H. Ali Yurtsever

Sultan Qaboos University Journal For Science

In the present paper a generalization of a theorem of I.B. Risteski (2004) concerning the solution of a nonlinear functional equation is given. The proof is based on a parametric approach by introducing a parameter in an arbitrary set , and on a matrix method for solving linear functional equations.

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Optimal Control Of Switching Linear Systems, Ali Benmerzouga Apr 2025

Optimal Control Of Switching Linear Systems, Ali Benmerzouga

Sultan Qaboos University Journal For Science

A solution to the control of switching linear systems with input constraints was given in Benmerzouga (1997) for both the conventional enumeration approach and the new approach. The solution given there turned out to be not unique. The main objective in this work is to determine the optimal control sequences {Ui(k) , i = 1,..., M ; k = 0, 1, ..., N -1} which transfer the system from a given initial state X0 to a specific target state XT (or to be as close as possible) by using the same discrete time solution obtained in Benmerzouga (1997) and minimizing …

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A New Approach To The Stabilization Of The Wave Equation With Boundary Damping Control, Boumediène Chentouf, Mohamed S. Boudellioua Apr 2025

A New Approach To The Stabilization Of The Wave Equation With Boundary Damping Control, Boumediène Chentouf, Mohamed S. Boudellioua

Sultan Qaboos University Journal For Science

This paper deals with boundary feedback stabilization of a system, which consists of a wave equation in a bounded domain of , with Neumann boundary conditions. To stabilize the system, we propose a boundary feedback law involving only a damping term. Then using a new energy function, we show that the solutions of the system asymptotically converge to a stationary position, which depends on the initial data. Similar results were announced without proof in (Chentouf and Boudellioua, 2004).

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On Regression Estimators Using Extreme Ranked Set Samples, Hani M. Samawi, Ahmed Y.A. Al-Samarraie, Obaid M. Al-Saidy Apr 2025

On Regression Estimators Using Extreme Ranked Set Samples, Hani M. Samawi, Ahmed Y.A. Al-Samarraie, Obaid M. Al-Saidy

Sultan Qaboos University Journal For Science

Regression is used to estimate the population mean of the response variable, , in the two cases where the population mean of the concomitant (auxiliary) variable, , is known and where it is unknown. In the latter case, a double sampling method is used to estimate the population mean of the concomitant variable. We invesitagate the performance of the two methods using extreme ranked set sampling (ERSS), as discussed by Samawi et al. (1996). Theoretical and Monte Carlo evaluation results as well as an illustration using actual data are presented. The results show that if the underlying joint distribution of …

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Recursive Estimation Of A Discrete-Time Lotka-Volterra Predator-Prey Model, Lakhdar Aggoun Apr 2025

Recursive Estimation Of A Discrete-Time Lotka-Volterra Predator-Prey Model, Lakhdar Aggoun

Sultan Qaboos University Journal For Science

In this paper, using hidden Markov models, we estimate the number of individuals in a two-species (predator-prey) animal population using partial information provided by the so-called capture-recapture technique. Random samples of individuals are captured, tagged in some way and released. After some time other random samples are taken and the marked individuals are observed. Using this information, we estimate (recursively) the sizes of the two populations. Also, using the Expectation Maximization (EM) algorithm, the parameters of the model are updated.

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Some Aspects Of The Anatomy And Histology Of Digestive Tracts In Two Sympatric Species Of Freshwater Fishes, Taher Ba-Omar, Reginald Victor, Daniel Tobias Apr 2025

Some Aspects Of The Anatomy And Histology Of Digestive Tracts In Two Sympatric Species Of Freshwater Fishes, Taher Ba-Omar, Reginald Victor, Daniel Tobias

Sultan Qaboos University Journal For Science

Comparative anatomy and histology of the digestive tracts of two sympatric species of freshwater fish, Aphanius dispar (Cyprinodontidae) and Garra barreimiae (Cyprinidae) are studied. Morphometric measurements of alimentary canal such as length and the number and height of rugae in sections have been made for both species. Relationships between these morphometric characters and the total length of fish have been evaluated. The ratio between the length of alimentary canal and total length of fish in both species reflects their feeding habits. Histology of the ‘stomach’ and ‘intestine’ of these two species as shown by light microscopy has been described and …

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Effect Of Mechanical Injury And Low Temperature Storage On The Accumulation Of Glycoalkaloids In The Tubers Of 7 Varieties Of Potato (Solanum Tuberosum L.) Grown In Oman, Elsadig A. Eltayeb, Sana Salem Al-Sinani, I. A. Khan Apr 2025

Effect Of Mechanical Injury And Low Temperature Storage On The Accumulation Of Glycoalkaloids In The Tubers Of 7 Varieties Of Potato (Solanum Tuberosum L.) Grown In Oman, Elsadig A. Eltayeb, Sana Salem Al-Sinani, I. A. Khan

Sultan Qaboos University Journal For Science

Tubers from 7 potato varieties were analyzed for their rates of glycoalkaloid accumulation in response to stresses of three types of mechanical injury and low temperature storage. Mechanical injuries were found to greatly stimulate glycoalkaloid accumulation in both peel and flesh of tubers. The extent of glycoalkaloid accumulation appears to depend on variety, type of mechanical injury, and storage period. Most of the injury-stimulated glycoalkaloid accumulation occurred within 7 and 14 days after treatment. Cutting the tubers resulted in the highest content of glycoalkaloids both in flesh and peel up to levels that exceeded the upper safety limit of 200 …

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Realization Of A Simplified Controllability Computation Procedure: A Matlab- Simulink Based Tool, Ali Al-Lawati, Afaq Ahmed Apr 2025

Realization Of A Simplified Controllability Computation Procedure: A Matlab- Simulink Based Tool, Ali Al-Lawati, Afaq Ahmed

Sultan Qaboos University Journal For Science

With the use of MATLAB-SIMULINK a simple tool has been developed to compute the controllabilities of nodes as well as branches of digital system networks. The primary advantage of this tool may be for such conditions where the study of controllability analysis of a system with different possible designs is required to give an optimal design solution. The ease of network simulation procedures together with the simple methodologies for inputting the different assigned parameters to the respective elements of the system in dynamic environments, are additional attributes of this tool.

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Solvent Extraction Of Thorium(Iv) By Didodecylphoric Acid, Fawwaz I. Khalili, Khaled M. Mousa, Ehsan I. Soudani Apr 2025

Solvent Extraction Of Thorium(Iv) By Didodecylphoric Acid, Fawwaz I. Khalili, Khaled M. Mousa, Ehsan I. Soudani

Sultan Qaboos University Journal For Science

Solvent extraction of Thorium (VI) ion from perchlorate solution using didodecylphosphoric acid, DDPA, in chloroform diluent was studied. The effects of stripping hydrochloric acid concentration, stripping time, extraction time, DDPA concentration, pH, ionic strength, supporting electrolyte and temperature on the extraction processes have been studied. From the distribution coefficient values at different temperatures,the enthalpy, the free energy and the entropy changes associated with the extraction processes were determined. The composition of the complex formed was established to be Th(ClO4)4-nRn(HR)5-n where, n=1 or 2 and (HR)2 represents the dimer of DDPA.

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Analysis Of Fire Data In Oman, K.S. Al-Jabri, A.W. Hago, A.S. Alnuaimi, S. Al-Mahrooqi Apr 2025

Analysis Of Fire Data In Oman, K.S. Al-Jabri, A.W. Hago, A.S. Alnuaimi, S. Al-Mahrooqi

Sultan Qaboos University Journal For Science

The aim of this study is to illustrate the problem of fire accidents in the Sultanate of Oman and their causes in order to find out how the existing data could be used as a base to improve fire resistance, to detect the weak points (vulnerability to fire) in existing structures, and to minimize fire occurrences in places where it is high. This will also provide useful recommendations with regard to fire safety including causes, people’s awareness and education, etc. Fire data in Oman were collected from two sources: The Directorate General of Civil Defence (Public Relations Department) and Sultan …

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Synthesis And Crystal Structure Of Overcrowded Non-Photochromic Organometallic Fulgide, Shar Saad Al-Shihry Apr 2025

Synthesis And Crystal Structure Of Overcrowded Non-Photochromic Organometallic Fulgide, Shar Saad Al-Shihry

Sultan Qaboos University Journal For Science

Pure E-isomer overcrowded organometallic fulgide 1 was obtained by using successive Stobbe condensations between ketones and succinate diester. Upon irradiation with UV light at (366 nm) it did not cyclise photochemically to the 1,8a-dihydronaphthalene derivative (1,8a-DHN) 8. The structure of 7 was confirmed by X-ray crystallographic analysis.

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On Group Codes Over Elementary Abelian Groups, Adnan A. Zain Apr 2025

On Group Codes Over Elementary Abelian Groups, Adnan A. Zain

Sultan Qaboos University Journal For Science

For group codes over elementary Abelian groups we present definitions of the generator and the parity check matrices, which are matrices over the ring of endomorphism of the group. We also lift the theorem that relates the parity check and the generator matrices of linear codes over finite fields to group codes over elementary Abelian groups. Some new codes that are MDS, self-dual, and cyclic over the Abelian group with four elements are given.

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Step-Wise Group Screening Designs With Unequal A-Priori Probabilities And Errors In Observations, M.M. Manene Apr 2025

Step-Wise Group Screening Designs With Unequal A-Priori Probabilities And Errors In Observations, M.M. Manene

Sultan Qaboos University Journal For Science

The performance of step-wise group screening with unequal a-priori probabilities in terms of the expected number of runs and the expected maximum number of incorrect decisions is considered. A method of obtaining optimal step-wise designs with unequal a-priori probabilities is presented for the case in which the direction of each defective factor is assumed to be known a -priori and observations are subject to error. An appropriate cost function is introduced and the value of the group size which minimizes the expected total cost is obtained.

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Effect Of Cold And Hot Temperature On Behavioral And Selected Physiological Measures Of Uromastyx Aegyptius (Agamidae), A.A. El-Banna, A.M. Al-Johany Apr 2025

Effect Of Cold And Hot Temperature On Behavioral And Selected Physiological Measures Of Uromastyx Aegyptius (Agamidae), A.A. El-Banna, A.M. Al-Johany

Sultan Qaboos University Journal For Science

The behavioral, physiological and biochemical response to low (2°C) and high (45°C) temperatures was studied in Uromastyx aegyptius. Twelve animals were divided into two experimental groups. A third control group was kept at 22 °C. All animals in the cooling, warming, and control groups were allowed a period of 24 hours for adjustments at 22 °C. Blood samples were collected from each animal when body temperature reached the corresponding levels. The results showed a significant (P<0.05) decrease in blood glucose and cholesterol levels during cooling (2°C). This reduction in extracellular fluid substrates reflects an increase in cellular uptake of these substrates. Warming (45°C) resulted in a significant (P< 0.05) increase in total proteins, urea, and uric acid. These later changes could be attributed to an increase in the evaporative water loss, particularly due to the increased observed panting, and the associated reduction in plasma volume. There were no significant (P>0.05) changes in T3 and T4, during cooling nor during warming. The results of this study suggest augmentation of anaerobic metabolism of the U.aegyptius …

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Efficient Synthesis Of The Plant Growth Regulator Ancymidol, Heiko Patzelt Apr 2025

Efficient Synthesis Of The Plant Growth Regulator Ancymidol, Heiko Patzelt

Sultan Qaboos University Journal For Science

The important cytochrome P450 inhibitor ancymidol is used as a plant growth retardant and has potential for various medicinal applications. However its high price sets economic limits to large-scale applications. Here a short and high-yielding synthesis is reported, providing ancymidol in substantial amounts in a cost- and time-efficient way.

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Physiological And Behavioral Adjustments Relative To Catecholamine Levels During Nesting In Olive Ridley (Lepidochelys Olivacea) And Hawksbill (Eretmochelys Imbricata) Sea Turtles In Masirah Island, Oman., A.Y.A Alkindi, I.Y. Mahmoud, Fatma Al-Siyabi Apr 2025

Physiological And Behavioral Adjustments Relative To Catecholamine Levels During Nesting In Olive Ridley (Lepidochelys Olivacea) And Hawksbill (Eretmochelys Imbricata) Sea Turtles In Masirah Island, Oman., A.Y.A Alkindi, I.Y. Mahmoud, Fatma Al-Siyabi

Sultan Qaboos University Journal For Science

Plasma adrenaline (ADR) and noradrenaline (NA) levels were measured for the first time in natural populations of hawksbill (Eretmochelys imbricata) and olive ridley (Lipedochelys olivacea) in Masirah Island, Arabian Sea; one of the few protected nesting grounds remaining in the world for these two endangered species. Plasma ADR and NA levels were assessed in individuals after they oviposited eggs and completed nesting exercises, and in individuals which were still searching for suitable nesting sites. Blood samples were taken from the cervical sinuses from two groups (oviposited and non-oviposited), which spent at least 1.5 h on the nesting grounds. The duration …

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Performance Evaluation Of Database Systems Using Colored Petri Nets, A.B. Mnaouer, K. Day, M. Al-Towaiq, F.A. Masoud Apr 2025

Performance Evaluation Of Database Systems Using Colored Petri Nets, A.B. Mnaouer, K. Day, M. Al-Towaiq, F.A. Masoud

Sultan Qaboos University Journal For Science

We propose Colored Petri Net (CPN) models for replicated and centralized database systems and conduct a comparative study of their performance. The designed CPN models capture the dynamics of the studied database systems and estimate their expected performance with an appropriate level of abstraction. A number of simulation experiments were performed under various load conditions of varying parameters such as server speed, network speed, and read/write ratio. The simulation results show that under similar operation conditions, replicated systems exhibit higher performance than centralized systems in terms of query response time and system saturation levels. However, centralized systems become more competitive …

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On The Computation Of The Maximum Uncertainty Volume Of Stable Polynomials, F.M. Al-Sunni Apr 2025

On The Computation Of The Maximum Uncertainty Volume Of Stable Polynomials, F.M. Al-Sunni

Sultan Qaboos University Journal For Science

In this paper we propose a non-linear optimization based approach for the computation of the stability region for uncertain polynomials. Both box of polynomials and diamond of polynomials are addressed. Examples are presented as an illustration.

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A Monte Carlo Method For Low Pressure Radio Frequency Discharges, Lahouaria Settaouti, Abderrahmane Settaouti Apr 2025

A Monte Carlo Method For Low Pressure Radio Frequency Discharges, Lahouaria Settaouti, Abderrahmane Settaouti

Sultan Qaboos University Journal For Science

There is increasing interest in glow discharges because of their importance to a large number of application fields, like the microelectronics industry, flat plasma display panel technology, the laser and light industry and analytical spectrochemistry. To improve the capabilities of rf glow discharges, a good understanding of the discharge physics is highly desirable. The typical calculated results include the radio frequency (rf) voltage, the electrical field distribution, the density of argon ions and electrons, the electron energy distribution function and information about the collision processes of the electrons with the Monte Carlo model. These results are presented throughout the discharge …

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Characterizations Of K- Semimetric Spaces, Abdul M. Mohamad Apr 2025

Characterizations Of K- Semimetric Spaces, Abdul M. Mohamad

Sultan Qaboos University Journal For Science

In this paper, we prove, for a space X, the following are equivalent:1. X is a D1 space with a regular-Gδ-diagonal,2. X is a D2 space with a regular-Gδ-diagonal, 3. X is a semi-developable space with Gδ (3) -diagonal, 4. X is a D1-space with a Gδ(3)-diagonal, 5. X is a D2 -space with a Gδ(3)-diagonal, 6. X is a q, -space with a G*δ (2)-diagonal, 7. X is a semi-developable space with G*δ (2)-diagonal, 8. X is a semimetrizable, c-stratifiable space, 9. X is a c-Nagata -space, 10. X is a K-semimetrizable.

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