Consequently, by integrating items on response capability in surv

Consequently, by integrating items on response capability in survey instruments, participants with low capability can be identified. Similar analyses based on other and less selected populations are recommended.”
“Many clinicians have used glycolic acid (GA) peels for facial acne, scarring, and hyperpigmentation, mainly in lighter skin types. Salicylic-mandelic acid combination peels (SMPs) are a newer modality, and there have been no well-controlled studies comparing them with other conventional agents.

To compare the therapeutic efficacy

and tolerability of 35% GA peels and 20% salicylic-10% mandelic acid peels in active acne and post-acne scarring and hyperpigmentation.

Forty-four patients with facial acne and post-acne scarring and hyperpigmentation were divided into two groups, with one receiving GA peels and the other GDC-0994 in vitro SMPs at fortnightly intervals for six sessions. The treating physician performed objective evaluation of treatment outcomes. The patients, the treating physician, and an independent observer made subjective assessments. Side effects of both agents were also noted.

Both the agents

were effective, but SMPs had a higher efficacy for most active acne lesions (p <.001) and hyperpigmentation (p <.001). Side effects were also lesser with SMPs.

Both BEZ235 research buy the agents were effective and safe in Indian patients, with SMPs being better for active acne and post-acne hyperpigmentation.

Timpac Engineers, New Delhi, India, provided the NeoStrata salicylic-mandelic peel.”
“Background: The use of teams is a well-known approach in a variety of settings, including health care, in both developed and developing countries. Team performance is comprised of teamwork and task work, and ascertaining whether a team is performing as expected to achieve

the desired outcome has rarely been done SCH727965 mw in health care settings in resource-limited countries. Measuring teamwork requires identifying dimensions of teamwork or processes that comprise the teamwork construct, while taskwork requires identifying specific team functions. Since 2008 a community-based project in rural Zambia has teamed community health workers (CHWs) and traditional birth attendants (TBAs), supported by Neighborhood Health Committees (NHCs), to provide essential newborn and continuous curative care for children 0-59 months. This paper describes the process of developing a measure of teamwork and taskwork for community-based health teams in rural Zambia.

Methods: Six group discussions and pile-sorting sessions were conducted with three NHCs and three groups of CHW-TBA teams. Each session comprised six individuals.

Results: We selected 17 factors identified by participants as relevant for measuring teamwork in this rural setting. Participants endorsed seven functions as important to measure taskwork. To explain team performance, we assigned 20 factors into three sub-groups: personal, community-related and service-related.

Results Constant perfusion with carbachol elicited tonic and puls

Results Constant perfusion with carbachol elicited tonic and pulse stimulation with carbachol and oxytocin rhythmic contractions of smooth muscle in the ground reticulum. Under constant perfusion with relaxin the tonic contraction after carbachol was abolished.

ATM/ATR inhibitor Conclusions With the novel microperfusion system, isotonic contractions of smooth muscle in the USL can be recorded and quantified in the tissue microenvironment on the microscopic level. The USL smooth muscle is cholinergic, stimulated by oxytocin and modulated by relaxin. Neurourol. Urodynam. 31:12941299, 2012. (C) 2012 Wiley Periodicals, Inc.”
“Purpose of review

To determine the advances made in the genetics of scleroderma in candidate gene association studies.

Recent findings

Over the past 18 months, a number of candidate gene studies using large case-control.. series in scleroderma have been reported. The studies have identified multiple genes involved SNS-032 in immune regulation including BANK1, C8orf13-BLK, IL-23R, IRF5, STAT4, TBX21, and TNFSF4 as susceptibility genes for the development of SSc. Furthermore, gene-gene interaction studies suggest that IRF5, STAT4, and BANK1 as well as TBX21 and STAT4 interact with regard to scleroderma susceptibility. Many of the genetic variants associated with SSc susceptibility are shared among other autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus.

Summary

Candidate

gene association studies have substantially advanced our

understanding of the pathogenesis of SSc and demonstrate that SSc is a polygenic, autoimmune disease.”
“Aims MLN4924 solubility dmso The uterosacral ligament (USL) contains prominent vessels, the function of which is unknown. Here we study the relationship between smooth muscle of the USL and the vascular bundles. Methods Native samples of arteries and vascular bundles were mounted in a perfusion chamber under the stereomicroscope. The effects of noradrenalin, carbachol, oxytocin, and relaxin were monitored by digital time-lapse video and quantified by image processing. Results Arteries were adrenergic and the smooth muscle in the adventitia cholinergic. Relaxin-2 shifted the dose response curve of noradrenalin to the right and widened the arterial lumen within 30?min. Oxytocin induced contraction of the adventitial smooth muscle leading to a slow opening of the artery. In a vascular bundle the differential pattern of both reactivities was demonstrated. Conclusions In the USL the smooth muscle extends into the adventitial layer of blood vessels and forms a functional unit with the vascular plexus, which is regulated by relaxin and oxytocin. Neurourol. Urodynam. 31:13001306, 2012. (C) 2012 Wiley Periodicals, Inc.”
“Purpose of review

Osteoarthritis is the most common form of arthritis in the elderly and is influenced by both genetic and environmental risk factors.

03% ophthalmic solution applied to the eyebrows in a randomized,

03% ophthalmic solution applied to the eyebrows in a randomized, double-blind, vehicle-controlled study.

Methods Subjects (n=20) with mild to moderate eyebrow hypotrichosis enrolled in the study. One group (Bim) applied bimatoprost to each eyebrow daily for 9months, and another applied vehicle nightly to each eyebrow for 5months. Subjects in the latter group were re-randomized to apply 3-deazaneplanocin A bimatoprost (Veh-Bim Group) or vehicle (Veh Group) daily to each eyebrow for 4months. The primary end point was investigator-assessed eyebrow

appearance; secondary end points were subject-reported outcomes.

Results Investigator assessments showed significant improvements from baseline to 6 (p=.002) and 7 (p=.005) months for the eyebrows treated with bimatoprost. p-Values for the Veh-Bim and Veh groups were not significant at any time point. End-of-study subject satisfaction with eyebrow fullness or thickness and darkness or color was greater in the Bim group than in the Veh group. Adverse effects were not observed.

Conclusion Bimatoprost 0.03% ophthalmic solution applied daily for 9months improves the appearance of eyebrows noticeably more than vehicle, without side effects.”
“BACKGROUND: Identification of modifiable psychosocial characteristics related to survival of heart transplant (HTx) candidates is needed to prevent clinical deterioration

and improve prognosis.

METHODS: A multi-site, prospective study was conducted with 318 HTx candidates (18% female, 82% male; 53 I I years of age) newly listed at 17 hospitals in Germany and Austria. Baseline demographic and psychosocial characteristics were assessed by questionnaires. Indicators check details of disease severity (Heart Failure Survival Score, creatinine, cardiac index) and 12-month outcomes (death, high-urgency HTx, elective HTx, de-listing due to deterioration or improvement) were provided by Eurotransplant.

RESULTS: By 12 months, 33 patients

died, 83 received an urgent HTx, 30 underwent an elective HTx, and 9 were de-listed due to clinical deterioration and 17 due to improvement. All measures of disease severity predicted outcomes. Controlling for disease severity, the number of social contacts contributed significantly to outcomes, favoring those Bcl-2 inhibitor who improved. Comparing socially isolated patients (<4 social contacts/month) who also had depression scores in the clinical range (high psychosocial risk group; n = 37) to those with >10 social contacts/month without depression (low psychosocial risk group; n = 47) revealed significant differences in the distribution of outcome frequencies (chi-square = 11.2, df = 4, p < 0.04). The high psychosocial risk group was more likely to have died/deteriorated and less likely to have improved than the low psychosocial risk group.

CONCLUSIONS: Regardless of disease severity, socially isolated HTx candidates who are also depressed may be at increased risk for clinical deterioration and mortality, indicating a need for psychosocial intervention.

Recent successful clinical trials in tissue engineering of the tr

Recent successful clinical trials in tissue engineering of the trachea have highlighted the importance of a functional epithelium for long-term success and survival of tissue replacements.

Hence, using the trachea as a model tissue in clinical use, we describe the optimal structure of an artificial epithelium as well as challenges of obtaining a fully functional epithelium in macroscale. One of the possible remedies to address such challenges is the use of bottom-up fabrication methods to obtain a functional epithelium. Modular approaches for the learn more generation of functional epithelial layers are reviewed and other emerging applications of microscale epithelial tissue models for studying epithelial/mesenchymal interactions in healthy and diseased (e.g., cancer) tissues are described. These models can elucidate the epithelial/mesenchymal tissue interactions at the microscale and provide https://www.selleckchem.com/products/sis3.html the necessary tools for the next generation of multicellular engineered tissues and organ-on-a-chip systems.”
“Brain tumors are the most common childhood solid malignancy and the leading cause of cancer-related death in children. Medulloblastoma, ependymoma,

supratentorial primitive neuroectodermal tumors, and pilocytic astrocytoma are the most prevalent types, all of which are clinically, histologically, and genetically heterogeneous. Despite an incomplete molecular understanding of these tumors, we have made significant headway in the past 5 years in identifying and classifying important genetic alterations and pathways central to the disease process. This review summarizes our current state of knowledge, emphasizes recent seminal findings in the field, and proposes future research efforts needed to further characterize the genetic basis of pediatric brain tumors.”
“Cooling towers provide a favorable environment for the proliferation of microorganisms. Cooling towers generate a biofilm and often aerosolize contaminated water, thereby increasing the risk of microorganism dissemination by human

inhalation. This pathogen dissemination was first revealed by the epidemics of Legionnaires’ Tipifarnib clinical trial disease that were directly related to the presence of cooling towers, and since then, the ecology of Legionella pneumophila has been well studied. Each country has specific standards regarding the acceptable amount of microorganisms in cooling tower systems. However, those standards typically only concern L pneumophila, even though many other microorganisms can also be isolated from cooling towers, including protozoa, bacteria and viruses. Microbiological control of the cooling tower system can be principally achieved by chemical treatments and also by improving the system’s construction.

05) ATWE induced proliferation was blocked by the addition of th

05). ATWE induced proliferation was blocked by the addition of the estrogen antagonist ICI 182,780 (p<0.05). Moreover, ATWE treatment caused a significant

GDC-0973 in vivo increase in mRNA expression of estrogen-responsive genes (pS2, PR, and cathepsin D; p<0.05). These results indicate that A. triphylla has estrogen-like activity and could be used to improve estrogen deficiency-related menopausal symptoms or diseases in postmenopausal women.”
“Percutaneous device closure in patients with an atrial septal defect (ASD) or patent foramen ovale (PFO) has gained popularity because of the short learning curve, cosmetic advantage and relative safety compared with surgery. Device complications may include device embolism, erosion, pericardial tamponade or thrombus formation, and most complications occur early. Herein we describe the previously unreported finding of a late thrombus on a Helex device after

PFO closure in a patient with cystic fibrosis and double-lung transplantation. J Heart Lung Transplant 2010;29:814-6 (C) 2010 International Society learn more for Heart and Lung Transplantation. All rights reserved.”
“Character evolution that affects ecological community interactions often occurs contemporaneously with temporal changes in population size, potentially altering the very nature of those dynamics. Such eco-evolutionary processes may be most readily explored in systems with short generations and simple genetics. Asexual and cyclically parthenogenetic organisms such as microalgae, cladocerans and rotifers, which frequently dominate freshwater plankton communities, meet these requirements. Multiple clonal lines can coexist within each species over extended periods, until either fixation occurs or a sexual phase reshuffles the genetic material. When clones differ in traits affecting interspecific interactions, within-species clonal dynamics can have major effects on the population dynamics. We first

consider a simple predator-prey system with two prey genotypes, parametrized with data from a well-studied https://www.selleckchem.com/products/ulixertinib-bvd-523-vrt752271.html experimental system, and explore how the extent of differences in defence against predation within the prey population determine dynamic stability versus instability of the system. We then explore how increased potential for evolution affects the community dynamics in a more general community model with multiple predator and multiple prey genotypes. These examples illustrate how microevolutionary ‘details’ that enhance or limit the potential for heritable phenotypic change can have significant effects on contemporaneous community-level dynamics and the persistence and coexistence of species.”
“Study Design. Randomized controlled trial with 1-year follow-up.

Objective. To analyze the effects of an exercise program or routine follow-up on patients with chronic low back pain who have completed functional multidisciplinary rehabilitation. The short-and long-term outcome in terms of symptoms and physical and social functioning was compared.

Design: We estimated the increase in ferritin associated with inf

Design: We estimated the increase in ferritin associated with inflammation (ie, CRP >5 mg/L and/or AGP >1 g/L). The 32 studies

comprised infants (5 studies), children (7 studies), men (4 studies), and women (16 studies) (n = 8796 subjects). In 2-group analyses (either CRP or AGP), we compared the ratios of log ferritin with or without inflammation in 30 studies. In addition, in 22 studies, the data allowed a comparison of ratios of log ferritin between 4 subgroups: reference (no elevated APP), incubation (elevated CRP only), early convalescence (both APP and CRP elevated), and late convalescence (elevated AGP only).

Results: In the 2-group analysis, inflammation SB203580 solubility dmso increased ferritin by 49.6% (CRP)

or 38.2% (AGP; both P <0.001). Elevated AGP was more common than CRP in young persons than in adults. In the 4-group analysis, ferritin was 30%, 90%, and 36% (all P < 0.001) higher in the incubation, early convalescence, and late convalescence subgroups, respectively, with corresponding correction factors of 0.77, 0.53, and 0.75. Overall, inflammation increased ferritin by approximate to 30% and was associated with a 14% (CI: 7%, 21%) underestimation of ID.

Conclusions: Measures AZD8055 ic50 of both APP and CRP are needed to estimate the full effect of inflammation learn more and can be used to correct ferritin concentrations. Few differences were observed between age and sex subgroups. Am J Clin Nutr 2010;92:546-55.”
“The poly(poly(ethylene glycol) methyl ether methacrylate)-(PPEGMA)-grafted bamboo fiber (BF) (BF@PPEGMA) was successfully synthesized via the esterification and atom transfer radical polymerization (ATRP) methods. The poly(butylenes succinate) (PBS) matrix-based

composites including BF and BF@PPEGMA were prepared by a twin-screw extruder. The structure, morphology, as well as the properties of BF@PPEGMA and composites was investigated. The results indicated that PPEGMA was successfully grafted onto the BF surfaces, making BF surfaces rough and less thermally stable. The BF@PPEGMA showed of stronger interactions with PBS matrix than pristine BF, leading to the improvement of tensile modulus, tensile strength, and elongation at break of the composites. The PBS/BF@PPEGMA composites absorbed less water than PBS/BF composites due to the existence of less content of hydroxyl groups after surface modification. Incorporation of BF and BF@PPEGMA facilitated the crystallization of PBS at higher temperatures, leading to formation of regular spherulites without appearance of transcrystallization. (C) 2011 Wiley Periodicals, Inc.

In the first (forward) stage reflectance spectra corresponding to

In the first (forward) stage reflectance spectra corresponding to given instances of the parameter values were computed using Monte Carlo simulation of photon propagation through a multi-layered tissue. In the second (inversion) stage the parameter values were obtained via optimization using an iterated conditional modes algorithm based on Discrete Markov Random Fields. The method was validated on computer generated data contaminated with noise giving a mean normalized root mean square deviation (NRMSD) of 2.04. Validation on ex vivo images demonstrated

that parametric maps show gross correspondence with histological features of mucosa characteristic of cancerous, precancerous and noncancerous colon lesions. The key signs of abnormality were shown to be the increase in the blood volume fraction and NU7441 DNA Damage inhibitor decrease in the density of scattering particles.”
“This study was undertaken to investigate the herbicidal activity of mango (Mangifera indica L.) leaves against parthenium weed (Parthenium hysterophorus L.). The aqueous leaf extract at 15% concentration (on fresh weight basis) significantly

reduced germination, shoot length and the shoot and root biomasses of parthenium seedlings. In a leaf residue incorporation pot trial, 2% residue incorporation treatment significantly suppressed the root and shoot biomasses of parthenium, while a 5% residue treatment completely stopped the growth of the weed. Five flavonoids, namely this website (-)-epicatechin-3-O–glucopyranoside (1), 5-hydroxy-3-(4-hydroxyphenyl)pyrano[3,2-g]chromene-4(8H)-one (2), 6-(p-hydroxybenzyl)taxifolin-7-O–D-glucoside (tricuspid) (3), quercetin-3-O–glucopyranosyl-(1 2)–D-glucopyranoside (4) and (-)-epicatechin(2-(3,4-dihydroxyphenyl)-3,4-dihydro-2H chromene-3,5,7-triol (5) were isolated from mango leaves. In a laboratory bioassay, 50 ppm solution of compounds 3 and 4 caused yellowing of the parthenium seedlings. A 250 ppm solution of compound 4 also significantly reduced germination and the root and buy CT99021 shoot lengths of parthenium seedlings. This study concludes that compound 4 exhibits herbicidal activity against parthenium

weed.”
“Ligularia achyrotricha (Diels) Ling has been used as a traditional Tibetan herbal medicine. Ligulachyroine A (1), a new twelve-membered macrocyclic pyrrolizidine alkaloid with a ketonic group located at C-3 and an hydroxy group linked at C-8, was isolated from the roots of L. achyrotricha. It is particularly noteworthy that the structure of 1 rarely appears in any other naturally occurring twelve-membered macrocyclic pyrrolizidine alkaloid reported to date. Three known lignans (2-4) and eight known coniferyl and sinapyl alcohol derivatives (5-12) were also obtained in this species. Their structures were elucidated through a careful analysis of their IR, MS, and NMR spectra. Compound 1 exhibited moderate activity against HL-60 and SMMC-7721 cells.

Historically, 2-year survival after VAD implant has been sub-opti

Historically, 2-year survival after VAD implant has been sub-optimal, and no patient management algorithms have been formally tested to determine their effect on 2-year survival.

METHODS: The study comprised 76 patients, of whom 26 had a VAD as destination

therapy (DT) and 50 as a bridge to transplant (BIT), from July 1, 2003, to June 30, 2008. Survival before and after initiation of ISP was compared. A parametric hazard multivariable analysis, with a time-varying Selleckchem BIX 01294 covariable for implementation of ISP, was used to evaluate of other factors affecting survival.

RESULTS: Survival at 16 months was 100% for DT patients who received a VAD after August 1, 2006 vs 64% for the earlier era (p = 0.06). For BIT, 16- month survival was 71% vs 43% (p = 0.03). Predicted 2-year survival before and after implementation of the ISP improved from 30% to 87% for DT (p = 0.02) and from 20% to 61% for BIT patients (p = 0.01). Predictors of midterm survival by multivariable analysis included ISP (p = 0.004), younger age (p = 0.03), non-emergent implant (p < 0.0001), and isolated left ventricular VAD (p < 0.0001). CHIR-99021 After adjustment for covariables, the ISP was associated with a 70% reduction in the hazard for death for the entire cohort (p = 0.004). The effect of ISP was also significant in the patients who

received the HeartMate XVE (Thoratec, Pleasanton, CA), which spanned both eras of the study.

CONCLUSIONS: Survival improved for DT and BIT VAD patients after implementation of the ISP, with a dramatic decrease in hazard for death. Although the transition from pulsatile

to axial flow technology occurred during the study period and likely contributed to improved outcomes, the institution of the ISP provided an important and selleck screening library significant contribution to improved survival through a proactive approach to patient management, allowing earlier identification of potential adverse events. For optimal outcomes, VAD patients require intensive follow-up surveillance protocols that have previously become standard in the care of heart transplant patients. J Heart Lung Transplant 2011;30:879-87 (C) 2011 International Society for Heart and Lung Transplantation. All rights reserved.”
“The transient electric current of surfactants dissolved in a nonpolar solvent is investigated both experimentally and theoretically in the parallel-plate geometry. Due to a low concentration of free charges the cell can be completely polarized by an external voltage of several volts. In this state, all the charged micelles are compacted against the electrodes. After the voltage is set to zero the reverse current features a sharp discharge spike and a broad peak. This shape and its variation with the compacting voltage are reproduced in a one-dimensional drift-diffusion model.

First, new phosphoproteome data on yeast cells were obtained by M

First, new phosphoproteome data on yeast cells were obtained by MS-based proteomics and unified with publicly available yeast phosphoproteome data. This revealed that nearly 60% of similar to 6,000 yeast genes encode phosphoproteins. We mapped these unified phosphoproteome data on a yeast protein-protein interaction (PPI)

network with other yeast multi-omics datasets containing information about PF-04929113 mw proteome abundance, proteome disorders, literature-derived signaling reactomes, and in vitro substratomes of kinases. In the phospho-PPI, phosphoproteins had more interacting partners than nonphosphoproteins, implying that a large fraction of intracellular protein interaction patterns (including those of protein complex formation) is affected by reversible and alternative phosphorylation reactions. Although highly abundant or unstructured proteins have a high chance of both interacting with other proteins and being phosphorylated within cells, the difference between the number counts of interacting partners of phosphoproteins and nonphosphoproteins was significant independently of protein abundance and disorder level. Moreover, analysis of the phospho-PPI and yeast signaling reactome data suggested that co-phosphorylation of interacting proteins by single kinases is common within cells. These multi-omics analyses

illuminate how wide-ranging intracellular phosphorylation events and the diversity AR-13324 ic50 of physical protein Small molecule library interactions are largely affected by each other.”
“Background: Response to cardiac resynchronization therapy (CRT) is reduced in patients with posterolateral scar. Multipolar pacing leads offer the ability to select desirable pacing sites and/or stimulate from multiple pacing sites concurrently using a single lead position. Despite this potential, the clinical evaluation and identification of metrics for optimization of multisite CRT (MCRT) has not been performed.

Methods: The efficacy of MCRT via a quadripolar lead with two left ventricular (LV) pacing sites in conjunction with right ventricular pacing

was compared with single-site LV pacing using a coupled electromechanical biophysical model of the human heart with no, mild, or severe scar in the LV posterolateral wall.

Result: The maximum dP/dt(max) improvement from baseline was 21%, 23%, and 21% for standard CRT versus 22%, 24%, and 25% for MCRT for no, mild, and severe scar, respectively. In the presence of severe scar, there was an incremental benefit of multisite versus standard CRT (25% vs 21%, 19% relative improvement in response). Minimizing total activation time (analogous to QRS duration) or minimizing the activation time of short-axis slices of the heart did not correlate with CRT response. The peak electrical activation wave area in the LV corresponded with CRT response with an R-2 value between 0.42 and 0.75.

Dietary SID Leu and Val were set to 1 05 and 0 66% For the 42-d

Dietary SID Leu and Val were set to 1.05 and 0.66%. For the 42-d period, ADG, ADFI, and G: F increased linearly (P < 0.01) and quadratically (P < 0.01) with increasing SID Ile: Lys. Estimated optimal SID Ile: Lys ratios were 54, 54, and 49 for ADG, ADFI, and G: F, respectively. These experiments suggest that the optimal SID Ile: Lys ratio depends on diet composition. In Exp. 1, AA imbalances because of increased Leu contents may have led to increased Ile nutritional needs. For ADG and ADFI, an optimum SID Ile: Lys ratio of 54% was estimated for 8- to 25-kg pigs in diets without Leu

excess.”
“An attempt was made to toughen diglycidyl ether of bisphenol A (DGEBA) type epoxy resin with liquid natural rubber possessing hydroxyl functionality (HTLNR). Epon 250 epoxy monomer is cured using nadic methyl anhydride as hardener in presence of N, N dimethyl benzyl amine as accelerator. click here HTLNR of different concentrations up to 20 wt % is used learn more as modifier for epoxy resin. The addition HTLNR to an anhydride hardener/epoxy monomer mixture has given rise to the formation of phase-separated structure, consisting of small spherical liquid natural rubber particles bonded to the surrounding epoxy matrix. The particle size increased with increase in rubber content. The viscoelastic properties of the blends were analyzed using dynamic mechanical thermal analysis. The Tg corresponding to epoxy rich

phase was evident from the dynamic mechanical spectrum, while the Tg of the rubber phase was overlapped by the beta relaxation of epoxy phase. Glass transition of the epoxy phase decreased linearly as a function of the amount of rubber. The mechanical properties such as impact HKI-272 research buy and fracture toughness were also carefully examined. The impact and fracture toughness increase with HTLNR content. A threefold increase in impact strength was observed with 15 wt % HTLNR/epoxy blend. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012″
“Leakiness (phi), the proportion of

carbon fixed by phosphoenolpyruvate carboxylation that leaks out of the bundle-sheath cells, determines C-4 photosynthetic efficiency. Large increases in phi have been described at low irradiance. The underlying mechanisms for this increase remain uncertain, but changes in photorespiration or the energy partitioning between the C-4 and C-3 cycles have been suggested. Additionally, values of phi at low light could be magnified from assumptions made when comparing measured photosynthetic discrimination against C-13 (Delta) with the theoretical formulation for Delta. For example, several simplifications are often made when modelling Delta to predict phi including: (i) negligible fractionation during photorespiration and dark respiration; (ii) infinite mesophyll conductance; and (iii) CO2 inside bundle-sheath cells (C-s) is much larger than values in mesophyll cells (C-m).