ORCID Profile
0000-0002-7534-7741
Current Organisation
Jordan University of Science and Technology
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Publisher: Springer Science and Business Media LLC
Date: 12-2001
Abstract: We investigated whether the food quality of tree foliage for African savanna browsers varies across the feeding height range of the guild. This was to address the question of why giraffes (Giraffa camelopardalis) generally feed at a higher level in the canopy than is accessible to all other browsers. We defined a giraffe browse unit (GBU) as the length of twig corresponding to the average "bite" taken by giraffes from two staple browse plants: Acacia nigrescens and Boscia albitrunca. We s led at three study sites in South Africa in the late dry season, at each site clipping GBUs at three heights above ground: 0.5 m, 1.5 m and 2.5 m these representing the levels typically browsed by small, medium and large-bodied browsing ungulates respectively. For each GBU we measured leaf dry mass, total N, neutral detergent fibre and condensed tannin, using near-infrared spectroscopy calibrated by conventional laboratory analyses. We found no differences between height levels with regard to leaf chemistry concentrations, but leaf biomass per GBU was significantly higher at the 1.5-m and 2.5-m levels than at the 0.5-m level. The larger browsers thus gain a bite-size advantage by browsing above the reach of the smaller species. A likely reason for the reduced leaf biomass per GBU at the low browsing level is the tendency for small browsers to pluck in idual leaves from shoots, while large browsers prune off whole shoots. We contend that our findings are analogous to those from parallel studies on the grazing guild, and are consistent with the hypothesis that the smaller members of ungulate guilds competitively displace the larger ones from shared feeding sites when resources become restricted. A prediction of this hypothesis is that the smaller members of each guild drive the grazing succession from behind and maintain browsing height stratification from below.
Publisher: Wiley
Date: 03-2001
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 11-2020
Publisher: CSIRO Publishing
Date: 2002
DOI: 10.1071/WR00050
Abstract: Near-infrared spectroscopy (NIRS) was used to predict the nutritive value of forage species available to the critically endangered northern hairy-nosed wombat (Lasiorhinus krefftii). Nutritive attributes of the forage successfully estimated included total nitrogen concentration, fibre (including neutral detergent fibre, acid detergent fibre and acid lignin), organic matter, water soluble carbohydrates and in vitro dry matter digestibility. The reported results demonstrate the seasonal variability of the forage resource available to L. krefftii in its tropical savanna habitat. Multivariate modelling of the spectra enabled the nutritive value of forage s les to be estimated with coefficients of determination (r2) of 0.770–0.995 and standard errors of the cross-validation of 0.070–2.850 using a modified partial least-squares analysis technique. The standard error of the laboratory was 0.02–1.42. This study demonstrates that broad-based NIRS predictive equations can be used to predict the nutritive value of a number of plant types available to a herbivore over time. By using NIRS the analyst can rapidly analyse large numbers of s les with limited reduction of precision, thereby enabling large-scale ecological applications that may have previously been impeded by time and costs.
Publisher: Authorea, Inc.
Date: 21-10-2020
Publisher: CSIRO Publishing
Date: 1999
DOI: 10.1071/AM00257
Abstract: na
Publisher: Hindawi Limited
Date: 14-02-2022
DOI: 10.1155/2022/7474121
Abstract: Purpose. Oxytocin has been suggested to play a vital role in modulating maternal behavior and stress-related disorders. However, the relationship between antenatal oxytocin and postpartum depression is not well established. We aim to investigate the association between serum oxytocin level in the late third-trimester and early-onset postpartum depression symptoms. Materials and Methods. A total of 172 healthy pregnant women participated in this cross-sectional descriptive study. The serum oxytocin level was measured between 34 and 37 weeks. A validated Edinburgh Postnatal Depression Scale (EPDS) was used to assess symptoms of depression four to six weeks postpartum. Participants who scored more than 12 on the EPDS were considered having depressive symptoms. Independent s le t -test and Pearson r were used to examine differences in depression scores. The level of significance was set at α = 0.05 . Results. 30.8% of the participants experienced depressive symptoms. There was no association between EPDS scores and oxytocin level r 170 = 0.10 , p = 0.23 . The association also did not exist even among women with a lifetime history of depression r 43 = − 0.13 , p = 0.37 . Participants with low education, low income, previous history of depression, positive family history of depression, positive family issues, and absent emotional family support have scored significantly higher on EPDS scores than their counterparts. The strongest association was with previous lifetime history of depression t 170 = − 4.40 , p 0.001 . Conclusions. Postpartum depression is a major public health problem in Jordan. Late trimester serum oxytocin level has no association with early-onset postpartum depression.
Publisher: CSIRO Publishing
Date: 2000
DOI: 10.1071/WR99053
Abstract: The northern hairy-nosed wombat, Lasiorhinus krefftii, is a critically endangered grazing herbivore, restricted to a single population of just 65 in iduals in the savanna of central Queensland. Lasiorhinus krefftii shares its habitat with another grazing herbivore of similar body size, the eastern grey kangaroo, Macropus giganteus. This study investigated the potential for M. giganteus to compete with L. krefftii for food. Analysis of faecal residues demonstrated that both herbivores consumed grass almost exclusively, with the exception of small quantities of sedges and dicotyledons. Dietary overlap between M. giganteus and L. krefftii was high, both in the consumption of plant species (90%) and plant parts (99%), suggesting that there is potential for dietary competition. Using the distribution of faecal deposits for both herbivores, analysis of habitat usage by multiple linear regression techniques indicated that M. giganteus exhibits clear associations with some habitat features but proved inconclusive for L. krefftii because of their use of defecation in social marking. However, an examination of the population dynamics of M. giganteus suggested that the densities reported in this study, although highly seasonal, are sufficiently low that competition with L. krefftii for food is currently negligible.
Publisher: Ovid Technologies (Wolters Kluwer Health)
Date: 07-2020
Publisher: Informa UK Limited
Date: 12-2020
DOI: 10.2147/IJWH.S279426
Publisher: Springer Science and Business Media LLC
Date: 09-2022
DOI: 10.1186/S13256-022-03565-7
Abstract: Alport syndrome is a rare inherited disorder affecting the glomerular basement membrane, manifested by hematuria and proteinuria that is commonly associated with ocular and hearing defects. There is limited information about the maternal and fetal outcomes of Alport syndrome in pregnancy. We describe a smooth course of pregnancy, a good maternal outcome, and a good fetal outcome in three consecutive pregnancies for a 35-year-old Mediterranean woman with Alport syndrome over a 10-year duration. Although there was a nephrotic range of progressive proteinuria in all her pregnancies, there was a prompt drop in proteinuria within 2 weeks of her deliveries. She has constantly shown a normal serum creatinine level and a normal serum protein level in all her pregnancies. Apart from a single episode of asymptomatic hypertension in her second pregnancy at 34 weeks of gestation that returned to a normal range immediately after delivery, she was normotensive antenatally and postnatally. She gave birth by cesarean section to three healthy newborns. A normal prepregnancy creatinine level and a mild range of proteinuria in a patient with normotension, who is not on any medication, are associated with good maternal and fetal outcomes. Furthermore, successful pregnancy that is followed by a normal renal function test might suggest a favorable outcome for any future pregnancy.
Publisher: Springer Science and Business Media LLC
Date: 03-09-1998
Abstract: Many ecological studies rely heavily on chemical analysis of plant and animal tissues. Often, there is limited time and money to perform all the required analyses and this can result in less than ideal s ling schemes and poor levels of replication. Near infrared reflectance spectroscopy (NIRS) can relieve these constraints because it can provide quick, non-destructive and quantitative analyses of an enormous range of organic constituents of plant and animal tissues. Near infrared spectra depend on the number and type of C[Formula: see text]H, N[Formula: see text]H and O[Formula: see text]H bonds in the material being analyzed. The spectral features are then combined with reliable compositional or functional analyses of the material in a predictive statistical model. This model is then used to predict the composition of new or unknown s les. NIRS can be used to analyze some specific elements (indirectly - e.g., N as protein) or well-defined compounds (e.g., starch) or more complex, poorly defined attributes of substances (e.g., fiber, animal food intake) have also been successfully modeled with NIRS technology. The accuracy and precision of the reference values for the calibration data set in part determines the quality of the predictions made by NIRS. However, NIRS analyses are often more precise than standard laboratory assays. The use of NIRS is not restricted to the simple determination of quantities of known compounds, but can also be used to discriminate between complex mixtures and to identify important compounds affecting attributes of interest. Near infrared reflectance spectroscopy is widely accepted for compositional and functional analyses in agriculture and manufacturing but its utility has not yet been recognized by the majority of ecologists conducting similar analyses. This paper aims to stimulate interest in NIRS and to illustrate some of the enormous variety of uses to which it can be put. We emphasize that care must be taken in the calibration stage to prevent propagation of poor analytical work through NIRS, but, used properly, NIRS offers ecologists enormous analytical power.
Publisher: Springer Science and Business Media LLC
Date: 18-02-2021
DOI: 10.1186/S10397-021-01082-X
Abstract: Emergency peripartum hysterectomy is a major operation performed when conservative measures fail to stop life-threatening postpartum hemorrhage. It is associated with a high rate of maternal morbidity among survivors. This work aims to evaluate the incidence, indication, and complications of peripartum hysterectomy at King Abdulla University Hospital over 15 years. A retrospective cohort study of emergency peripartum hysterectomy. The incidence was calculated. Risk factors for abnormally adherent placenta were explored. A comparison between total and subtotal hysterectomy in terms of morbidity outcomes was conducted. The chi-square test, Fisher’s exact, and independent s le T test were used for analysis. Statistical significance was declared at α 0.05. The incidence of peripartum hysterectomy was 1.38 per 1000 births. Fifty-nine were performed after cesarean section and three were performed after vaginal delivery ( P .001). Abnormally adherent placenta (accreta, increta, and percreta) was the main indication (44.06%). The strongest risk factor for abnormally adherent placenta was placenta previa with previous cesarean section ( P =0.001, OR 16.25, 95% CI 1.95-135.01). One maternal and three neonatal deaths were recorded. Urinary bladder injury was the most frequent complication (27.11%). No difference in morbidity was noted between total and subtotal hysterectomy. The incidence of emergency peripartum hysterectomy is increasing steadily over the last two decades in the north of Jordan. Abnormally adherent placenta is the most common indication for emergency peripartum hysterectomy. There is no significant difference between total and subtotal hysterectomy in terms of complications’ development, admission to the intensive care unit, and estimated blood loss. The morbidity associated with emergency peripartum hysterectomy is significant.
Publisher: Informa UK Limited
Date: 07-2021
DOI: 10.2147/RMHP.S306124
Publisher: Research Square Platform LLC
Date: 19-10-2020
DOI: 10.21203/RS.3.RS-87375/V1
Abstract: Background Emergency Peripartum hysterectomy is a major operation performed when conservative measures fail to stop life-threatening postpartum haemorrhage. It is associated with a high rate of maternal morbidity among survivors. The aim of this work is to evaluate the incidence, indication, and complications of peripartum hysterectomy at King Abdulla University Hospital over a 15-year period. Methods A retrospective cohort study of emergency peripartum hysterectomy. The incidence was calculated. Risk factors for abnormal placentation were explored. A comparison between total and subtotal hysterectomy in terms of morbidity outcomes was conducted. The Chi-square test, Fisher’s exact and Independent S le T-Test were used for analysis. Statistical significance was declared at α 0.05. Results The incidence of peripartum hysterectomy was 1.46 per 1000 births. Sixty-three were performed after caesarean section and three were performed after vaginal delivery ( P 0.001). Abnormal placentation (accreta, increta and percreta) was the main indication (46.03%). The strongest risk factor for abnormal placentation was placenta previa with previous caesarean section ( P 0.001, OR 17.33, 95% CI 2.09–143.14). One maternal and three neonatal deaths were recorded. Urinary bladder injury was the most frequent complication (26.98%). No difference in morbidity noted between total and subtotal hysterectomy. Conclusions The incidence of emergency peripartum hysterectomy in increasing steadily over the last two decades in the north of Jordan. Abnormal placentation is the commonest indication for emergency peripartum hysterectomy. There is no significant difference between total and subtotal hysterectomy in terms of complications` development, admission to the ICU, and estimated blood loss. The morbidity associated with emergency peripartum hysterectomy is significant.
Location: Jordan
No related grants have been discovered for Hasan Rawashdeh.