Does an Optimal Working Capital Exist? The Role of Financial Constraints

The aim of the present study is to examine the linkage between working capital management, financial constraints, and profitability of the listed textile firms of Pakistan during 2005-2014. The outcomes of panel models reveal that more (less) financially constrained firms to have smaller (longer) net trade cycle. Moreover, the study found an inverted U-shaped relationship between investment in working capital and firm performance. Based on the empirical results of this study it is suggested that financial managers should try to maintain an optimal level of working capital to optimize the profit performance of the firm, as an investment in working capital above that optimal point will negatively affect the corporate profitability. Keywords: Working Capital, Firm Performance, Financial Constraints, Pakistan

Coupled coincidence point results for a generalized compatible pair with applications

In this paper, employing a new concept of generalized compatibility of a pair of mappings defined on a product space, certain coupled coincidence point results of mappings involved herein are obtained. We also deduce certain coupled fixed point results without mixed monotone property of F. Our results generalize some recent comparable results in the literature. Moreover, some examples and an application to integral equations are given here to illustrate the usability of the obtained results.Deanship of Scientific Research (DSR), King Abdulaziz University, Jeddah.http://link.springer.com/journal/11784hb201

A study illustrating the risk factors, clinical presentation and management of ectopic pregnancy in a secondary hospital in Bahrain

Background: Assess the risk factors, clinical presentation and type of intervention indicated in ectopic pregnancies at American mission hospital in Bahrain. Methods: This is a retrospective cohort study conducted from August 2021 to April 2022 at American mission hospital in Bahrain. All patients (n=205) who attended the hospital from January 2017 to June 2021 with a presentation suggestive of ectopic pregnancy were extracted from the electronic medical record database and reviewed. Data was recorded on Microsoft Excel version 16.61.1 and numerical data was extrapolated into graphs and tables via IBM SPSS Statistics version 28.0.0.0 (190). Data was subjected to descriptive and stratification analysis. Results: The leading risk factor for ectopic pregnancy was previous pelvic surgery (40.4%). The most reported symptom was amenorrhea (65.9%). Risk of rupture was tripled when serum B-hCG level was elevated, rendering it the strongest predictor of rupture according to our data (95% CI=1.25, 7.19; p-value 0.0139). Majority of patients (56.4%) were treated with methotrexate with a success rate of 88.7% and 8.5% of cases were managed expectantly. Those who failed medical management or presented with rupture were treated surgically.Conclusions: Our study found B-hCG levels to be the most sensitive predictor of rupture and need for surgical intervention. Therefore, management was largely, but not exclusively, based on B-hCG levels. Majority of cases were treated medically and patients undergoing expectant management experienced no complications.

On Multivalued Hybrid Contractions with Applications

Recently, a notion of b-hybrid contraction for single-valued mappings in the framework of b-metric spaces which unify and improve several significant existing results in the corresponding literature was introduced. This paper presents a multivalued generalization for such contraction. Moreover, one of our obtained results is applied to analyze some solvability conditions of Fredholm-type integral inclusions. Nontrivial examples are also provided to support the assertions of our theorems

Green tea polyphenols induce p53-dependent and p53-independent apoptosis in prostate cancer cells through two distinct mechanisms.

Inactivation of the tumor suppressor gene p53 is commonly observed in human prostate cancer and is associated with therapeutic resistance. We have previously demonstrated that green tea polyphenols (GTP) induce apoptosis in prostate cancer cells irrespective of p53 status. However, the molecular mechanisms underlying these observations remain elusive. Here we investigated the mechanisms of GTP-induced apoptosis in human prostate cancer LNCaP cells stably-transfected with short hairpin-RNA against p53 (LNCaPshp53) and control vector (LNCaPshV). GTP treatment induced p53 stabilization and activation of downstream targets p21/waf1 and Bax in a dose-dependent manner specifically in LNCaPshV cells. However, GTP-induced FAS upregulation through activation of c-jun-N-terminal kinase resulted in FADD phosphorylation, caspase-8 activation and truncation of BID, leading to apoptosis in both LNCaPshV and LNCaPshp53 cells. In parallel, treatment of cells with GTP resulted in inhibition of survival pathway, mediated by Akt deactivation and loss of BAD phosphorylation more prominently in LNCaPshp53 cells. These distinct routes of cell death converged to a common pathway, leading to loss of mitochondrial transmembrane potential, cytochrome c release and activation of terminal caspases, resulting in PARP-cleavage. GTP-induced apoptosis was attenuated with JNK inhibitor, SP600125 in both cell lines; whereas PI3K-Akt inhibitor, LY294002 resulted in increased cell death prominently in LNCaPshp53 cells, establishing the role of two distinct pathways of GTP-mediated apoptosis. Furthermore, GTP exposure resulted in inhibition of class I HDAC protein, accumulation of acetylated histone-H3 in total cellular chromatin, resulting in increased accessibility of transcription factors to bind with the promoter sequences of p21/waf1 and Bax, regardless of the p53 status of cells, consistent with effects elicited by an HDAC inhibitor, trichostatin A. These results demonstrate that GTP induces prostate cancer cell death by two distinct mechanisms regardless of p53 status, thus identifying specific well-defined molecular mechanisms that may be targeted by chemopreventive and/or therapeutic strategies

Oxidative Stress and Antioxidant Status in High-Risk Prostate Cancer Subjects

The oxidant/antioxidant balance has been implicated in the pathophysiology of prostate cancer. We investigated oxidative damage and antioxidant status in high-risk prostate cancer subjects. Reduced glutathione (GSH) levels were measured in erythrocytes, 8-hydroxydeoxyguanosine (8-OHdG) in leukocytes and plasma levels of catalase (CAT), glutathione peroxidase (GSH-Px), glutathione reductase (GSH-R), glutathione S-transferase (GST), superoxide dismutase (SOD), and lipid peroxide products were measured in high-risk and age-matched healthy subjects. Serum PSA levels were significantly higher (p < 0.0001) in high-risk subjects, whereas GST (p < 0.0001) and GSH (p < 0.002) were higher in healthy controls. Levels of 8-OHdG, an oxidized nucleoside of DNA, were significantly increased (p < 0.0001) in high-risk subjects. No marked difference in the levels of CAT (p = 0.237), GSH-Px (p = 0.74), GSH-R (p = 0.344), SOD (p = 0.109), and lipid peroxide products (p = 0129) were observed between two groups. Pearson’s correlation between GST and PSA (r = −0.69 (p < 0.0001)), GST and 8-OHdG (r = −0.62 (p < 0.0004)), GSH and 8-OHdG (r= −0.39 (p = 0.038)), and CAT and GSH-Px (r= −0.33 (p = 0.04)) were found to be negatively correlated, whereas 8-OHdG and PSA were positively associated (r= 0.57 (p < 0.002). These results indicate a significant role of oxidative damage in prostate carcinogenesis, particularly during the early stages of development. In conclusion, our data support the importance of antioxidant defense as a valuable diagnostic and/or prognostic marker in prostate cancer