Introduction: Sugarcane cultivation has been revived in Khuzestan province of Iran since the 1960s and due to good results, it gradually began to grow from north to south of this region. Currently, sugarcane is cultivated in more than 100, 000 hectares of the provinceand almost 25% of the country needs for sugar arebeing produced in this region. Sugarcane fields of Khuzestan province are mainly rich in lime percentage and poor in organic matter and phosphorus. Soil pH in this region of the country also is about 8-8. 5 and phosphorus uptake by plants and phosphorus fertilizer efficiency in these soils (alkaline and calcareous soils) are expected to be low. The optimum use of phosphorus fertilizer and proper phosphorus uptake is essential for the quantitative and qualitative function of sugarcane plants. Due to the very low mobility of phosphorus in the soil, its uptake by plants such as sugar cane is affected by number of soil and plant factors (especially plant root characteristics). Changes in these factors can lead to a reduction or increase of P uptake by the crop. Materials and Methods: Because of the role of organic compounds in the improvement of mobility and phosphorus uptake, the use of organic material has been considered in many types of research. Organic compounds can play a direct and indirect role in plant factors and in phosphorous uptake improvement. In this regard, a greenhouse pot experiment was conducted in 2016-2017 at Farabi Agro Industry Co, 35 km south of Ahvaz, Iran (48º 36' E, 30º 59' N). This research carried out by using three levels of humic acid (immersion of settes in three concentrations of 0, 0. 3 and 0. 5% of humic acid) as well as three levels of phosphorus fertilizer (triple super phosphate) 0, 50 % and 100% of the recommended amount in the region (250 kg/ha) in two different harvesting periods (45 and 90 days after planting). The experiment set up as a factorial, based on complete randomized design with three replicates. In this experiment, the effects of different levels of phosphorous fertilizers and humic acid on aerial part (shoot height, shoot dry weight), underground part (root length, root dry weight and root hair length), and also root CEC of sugar cane plant in two harvest times were studied. Finally, uptake and influx of phosphorus in different treatments were investigated. Results and Discussion: As the results show, although the range of the changes was different, the use of humic acid can improve almost all of these factors. Shoot height, shoot dry weight in humic acid treatments showed a significant increase in both harvests compared to non-used humic acid treatments and also in phosphorus fertilizer treatments as the fertilizer levels rose. These results show that humic acid can increase the uptake of phosphorus from the soil reservoir (treatments without phosphorus fertilizer) and source of soil and phosphorus fertilizer (phosphorus fertilizer treatments). The underground plant parts have also shown similar results. Root length and root dry weights have also been shown positive results in humic acid treatments. Therefore, an increase in phosphorus uptake in nonuse phosphorous fertilizer treatments or phosphorous fertilizer treatments, along with humic acid, relative to nonhumic acid treatments could be explained. The humic acid application seems to increase the uptake capacity of phosphorus from soil and fertilizer sources by increasing root length and root dry weight. In addition, the use of humic acid in alkaline soil can increase the solubility of phosphorus in water and therefore the phosphorus uptake by the roots of the plant could be increased. Based on the results, using humic acid due to improved phosphorus fertilizer use efficiency, phosphorous uptake by plant is expected to be increased and hence the fertilizer use would be reduced. Phosphorus influx results had not the same direction with uptake and application of phosphorus fertilizer. P influx results showed an inverse relationship with root length. In other words, phosphorus uptake was more dependent on the root growth. Conclusion: This study showed that it is possible to use humic acid in the practical form during the cultivating of sugarcane setts, but it seems that further research is needed to examine other important points such as the use of humic acid during plant growth season and other its application forms, such as spraying or application in irrigation water.

Plant species differ in their ability to grow at low available P soils in other words, plant species differ in P use efficiency at low P supply. This ability can be investigated by comparing P uptake efficiency of plants and relative effective factors. A pot experiment was carried out in the growth chamber and sugar beet, maize and groundnut were grown in a low available P soil in a completely randomized design with three P fertilizer levels of low, medium and high. Three harvests were performed at two different growth periods. The results showed that at low P supply, sugar beet was the most efficient plant among three species as it showed the highest relative yield. The higher P use efficiency of sugar beet was due to a higher P uptake efficiency. Phosphorus uptake for sugar beet was 29 mg P plant-1 while those for maize and groundnut were 19 and 0.8 mg P plant-1, respectively. The main reason for higher P uptake efficiency of sugar beet was its higher P influx as compared to maize and groundnut. Under low P supply during the first growing period, P influx of sugar beet was higher than that of maize and groundnut by factor 4 and 22, respectively. Finally, the higher P use efficiency of sugar beet was due to a higher P uptake efficiency which in turn was due to a high P influx.

One of the strategies of using low-soluble P farctions in the soil is selection and cultivation of plants and varieties with high P uptake efficiency. According to the necessity of P uptake efficiency and effective mechanisms in commercial varieties of sugarcane knowledge, a pot experiment was carried out in greenhouse condition in Hakim Farabi Agro-Industry CO.. The treatments were P fertilizer (including: blank (P0), 125 (P50) and 250 (P100) kg ha-1 as triple superphosphate) and varieties of sugarcane (including: CP57-614, CP69-1062 and CP48-103) in three sampling times (including: 45, 90 and 130 days after planting) with three replications in factorial based on completely randomized design. In this study, P uptake, root length, specific root length, root to shoot ratio and P influx were evaluated at each sampling time. In low available P condition, the CP48 and the CP57 varieties able to uptake more P and then considered as efficient P varieties. However, CP69 has less ability to uptake of P in this condition. In this condition, CP48 variety, P uptake was increased by 13% and 45% compared to CP57 and CP69 varieties respectively. However, CP57 showed enhancement of P uptake up to 29% compared to CP69 variety. Phosphorus influx decreased in CP57 and CP69 varieties by 53% and 67% respectively with aging of sugarcane that the greatest decrease of influx was observed in CP69 variety. In the CP48 variety, P influx increased up to 66%, which can be an effective factor in more P uptake. Therefore, these differences in the ability of P uptake in sugarcane varieties and mechanisms affecting P uptake can improve the management of P fertilizer consumption especially in ratoon.

Objective Root structure modification is associated with the efficient water uptake and the nutrient utilization. It also provides structural support for the anchoring in soil. Genetic engineering for the improvement of plant root structure may help to maintain higher yields under drought conditions. The aim of this study was to modify the root structure of rice in order to improve drought tolerance and the efficiency of nutrient uptake. For this purpose, simultaneous transformation of Deeper Rooting1 or OsDRO1 gene, which is involved in the regulation of growth angle of the root in order to adapt to drought conditions, and Phosphorus-Starvation Tolerance1 or OsPSTOL1 gene, which is effective in increasing phosphorus uptake and improving root structure, were considered for rice root structure modification. Materials and methods The OsDRO1 and OsPSTOL1 genes derived from the wild rice cultivars were cloned together in a single construct under the control of the root specific and the ubiquitin promoters, respectively. The resulting construct, pUhrDroPstol is transformed into the Agrobacterium tumefactions strain EHA105 and used for the gene transformation into Hashemi cultivar. Putative transgenic plants, survived on 50 mg/L Hygromycin during tissue culture steps, are transplanted into the Yoshida solution and then into the pots until they set seeds. Construct specific and gene specific PCR analysis are used to confirm the transgenic plants. Results In this study, 12 putative transgenic rice events were obtained, of which 10 showed the presence of both OsDRO1 and OsPSTOL1 genes in the PCR analysis. Transgenic plants show stronger root structure compared to the non-transgenic ones. Molecular analysis in the T1 and T2 generations determined the homozygous events. Conclusions In this study, two candidate genes affecting root structure, nutrient uptake and drought tolerance were transferred to the Hashemi rice using genetic engineering. So far, simultaneous transfer of these two candidate genes have not been reported. Transgenic plants present better root system compared to the control plants. The mentioned construct can be used for the transformation of other crops to improve their root structure, nutrient uptake and their drought tolerance. It is hoped that the production of the transgenic rice with modified root structure and efficient phosphorus uptake increases its drought tolerance and reduce water consumption in rice cultivation.

Nowadays, UnderBalanced Drilling (UBD) technology is widely applicable in the petroleum industry due to its advantages to an overbalanced drilling operation. UBD success depends on maintaining the drilling fluid circulating pressure below the reservoir pore pressure during operations. One of the main prerequisites of a successful UBD operation is the correct estimation of the pressure profile. In this investigation, the pressure profile was obtained with consideration of the influx to the wellbore. A spreadsheet was developed to obtain the pressure profile using an analytical solution for aerated mud in UBD operation. Moreover, a numerical simulation was employed to simulate the three-phase flow in annulus through the UBD operation and the transient Eulerian model flow via the turbulence k-ε model. The effects of solid particle size and rotation of the inner pipe were considered on the pressure drop. It was observed that pressure drop was significantly increased with increasing solid particle size while it remained almost constant with increasing of the inner pipe rotation. The analytical and numerical results were compared with published experimental results and showed a good agreement.

Proposing the theory of influx, Francisco Suárez argued that each of the four causes “inflows” its being into the effect. This theory takes the concept of four causes, especially the final cause, to be similar to the efficient cause. By this move, Suárez can account for God’s purposeless and free will as well as His purposeful action through nature. Influenced by Suárez’s theory, Descartes excluded the final cause from his philosophy, which paved the way for the mechanical explanation of nature. It was thus possible for a theory developed with theological objectives to provide the basis for the scientific explanation of nature. In this study, we examine the differences and similarities between Descartes’s and Suárez’s natural teleology. Comparing these two metaphysical systems reveals how two theories may be influenced by the same principles but produce contradictory results. Thus, we will first analyze the concept of the theory of influx. Following that, we present textual evidence to highlight the impact of influx theory on Descartes and Suárez’s natural teleology. Subsequently, we examine how Descartes took causal (viz. efficient) necessity as the only good in nature by developing Suárez’s theory of causality.  

Objective: In this study quantitative expression of MDR1 and hOCT1 genes in CML patients and normal people were measured using Real-Time PCR.Materials and Methods: To study quantitative expression of these genes by real-time PCR, master-mix with syber green was used. Peripheral blood samples from 30 CML patients and 27 normal persons were harvested. Real-time PCR results were analyzed with relative quantification method.Result: This study showed that in the patients group who were under treatment with Imatib, MDR1 gene expression was increased which was statistically significant. This increase has a direct relation with disease progress. Gene expression in AP and BP patients was also higher than CP patients. In contrast, hOCT1 expression in patients group in comparison with normal group was not statistically significant.Conclusion: MDR1 increase in leukemic cell membrane results in the reduction of intra-cellular drug concentration. Thus, optimal concentration of drug for inhibition of BCR-ABL tyrosine kinase is not achieved which culminated in disease progression to AP and BP phases. Moreover changes in hOCT1 gene expression as an influx transporter of Imatib could affect intracellular concentration of drug and finally determine therapy outcome. However, in this study hOCT1 gene expression was variable and was not statistically significant.