title: Manufacture of Casein from Milk Retentates

authors: Hills, Michael

subjects: Casein

abstract: Casein is the major protein component of cow’s milk and is extracted commercially for a wide range of applications. Before casein is precipitated from milk by acid, milk is commonly concentrated by ultrafiltration to increase throughput and partly recover lactose. The degree to which the milk can be concentrated is limited due to higher concentrations producing a tough rubbery curd that causes downstream processing difficulties, particularly when casein is washed to remove calcium, lactose, whey and other impurities. This thesis examines using milk protein concentrates, MPC70 and MPC85 retentates from ultrafiltration, to manufacture casein. MPC85 was used on a large scale process, and MPC70 was used on lab scale process. Lab scale casein production techniques were developed to produce a similar casein to process scale. Effects of dilution and pH were examined on casein properties and calcium and lactose removal. Diluting the retentates prior to acidification was effective at reducing the residual levels of calcium and lactose in the casein, and no increase in residual whey protein was found compared to conventional casein production. The optimal precipitation pH remained at 4.60, and the resulting casein was not found to have any reduction in its functional performance. Lowering precipitation pH increased casein losses due to fines being formed and difficulty in separating wash water from the curd. Use of milk retentate for casein manufacture allows greater recovery of lactose and may have positive implications for the economics of the process in reducing washing required to produce high quality casein.

text: Manufacture of Casein from Milk Retentates Casein is the major protein component of cow’s milk and is extracted commercially for a wide range of applications. Before casein is precipitated from milk by acid, milk is commonly concentrated by ultrafiltration to increase throughput and partly recover lactose. The degree to which the milk can be concentrated is limited due to higher concentrations producing a tough rubbery curd that causes downstream processing difficulties, particularly when casein is washed to remove calcium, lactose, whey and other impurities. This thesis examines using milk protein concentrates, MPC70 and MPC85 retentates from ultrafiltration, to manufacture casein. MPC85 was used on a large scale process, and MPC70 was used on lab scale process. Lab scale casein production techniques were developed to produce a similar casein to process scale. Effects of dilution and pH were examined on casein properties and calcium and lactose removal. Diluting the retentates prior to acidification was effective at reducing the residual levels of calcium and lactose in the casein, and no increase in residual whey protein was found compared to conventional casein production. The optimal precipitation pH remained at 4.60, and the resulting casein was not found to have any reduction in its functional performance. Lowering precipitation pH increased casein losses due to fines being formed and difficulty in separating wash water from the curd. Use of milk retentate for casein manufacture allows greater recovery of lactose and may have positive implications for the economics of the process in reducing washing required to produce high quality casein.

year: 2011

title: Investigating the effectiveness of an analogy activity in improving students’ conceptual change for solution chemistry concepts

authors: Çalik, Muammer

subjects: analogy

abstract: This paper reports on an investigation on the use of an analogy activity and seeks to provide evidence of whether the activity enables students to change alternative conceptions towards views more in accord with scientific views for aspects of solution chemistry. We were also interested in how robust any change was and whether these changes in conceptual thinking became embedded in the students’ long-term memory. The study has its theoretical basis in an interpretive paradigm, and used multiple methods to probe the issues in depth. Data collection consisted of two concept test items, one-on-one interviews, and student self-assessment. The sample consisted of 44 Grade 9 students selected from two intact classes (22 each), from Trabzon, Turkey. The interviews were conducted with six students selected because of evidence as to their significant conceptual change in solution chemistry. The research findings revealed statistically significant differences in pre-test and post-test scores, and pre-test and delayed post-test scores (p<0.05), but no differences between post-test and delayed test scores (p>0.05). This suggests that the analogy activity is helpful in enhancing students’ conceptual understanding of solution chemistry, and that these changes may be stored in the students’ long-term memory.

text: Investigating the effectiveness of an analogy activity in improving students’ conceptual change for solution chemistry concepts This paper reports on an investigation on the use of an analogy activity and seeks to provide evidence of whether the activity enables students to change alternative conceptions towards views more in accord with scientific views for aspects of solution chemistry. We were also interested in how robust any change was and whether these changes in conceptual thinking became embedded in the students’ long-term memory. The study has its theoretical basis in an interpretive paradigm, and used multiple methods to probe the issues in depth. Data collection consisted of two concept test items, one-on-one interviews, and student self-assessment. The sample consisted of 44 Grade 9 students selected from two intact classes (22 each), from Trabzon, Turkey. The interviews were conducted with six students selected because of evidence as to their significant conceptual change in solution chemistry. The research findings revealed statistically significant differences in pre-test and post-test scores, and pre-test and delayed post-test scores (p<0.05), but no differences between post-test and delayed test scores (p>0.05). This suggests that the analogy activity is helpful in enhancing students’ conceptual understanding of solution chemistry, and that these changes may be stored in the students’ long-term memory.

year: 2009

title: New Zealand army chaplains at war : 2 NZEF 1939 - 1945

authors: Glen, Frank

abstract: This thesis investigates the motivations to engage in, and the pastoral and sacramental work of, the 1939-45 World War Two chaplains of the Second New Zealand Expeditionary Force, and it explores the theological framework, and theology in which such chaplaincy was carried out. It concludes by noting significant factors and issues of concern to chaplains and their churches in respect of the transition from war to peace.

Historical models of military chaplaincy are found in Constantine’s Roman Empire of 312-337CE, the Christian Crusades of 1096-1291, and the later British Empire. Features of these models provide a tool for understanding and interpreting many aspects of the work and role of the military chaplains of this study. The impact of Christian pacifism is considered, as it is one of the influences which came to bear upon the decision of some clergy who enlisted as chaplains.

Chaplains were recruited from eight denominations and they demonstrated a common pastoral concern for all who were engaged in the various theatres of war. Through the introduction of the concept of ecumenical unit chaplaincy, the battalion became the padre’s parish where he conducted worship, exercised pastoral skills, read the liturgies and preached the Gospel. This became the corner-stone of an ecumenical chaplaincy which developed throughout the war years. Despite the exigencies of war a Bible Class network, church parades - both voluntary and compulsory - and a wide range of religious activities contributed to a spiritual programme which met the needs of a largely nominal Christian 2NZEF.

There emerged from the experience of worship within the 2NZEF a pragmatic ecumenical approach to many aspects of chaplaincy, including in particular the practice, at least for Protestants, of inter-communion. Roman Catholic practice and theological understanding of the Eucharist was enriched by a particular New Zealand contribution. The isolation of the Pacific theatre, coupled with the maturing of the Chaplain’s Department through the Middle East experiences, resulted in a heightening of ecumenical development within the 3rd Division chaplaincy.

The chaplain’s skills in pastoral matters were required to maintain morale, cope with death, wounding and captivity. They are defined first from a military perspective and then examined from a biblical viewpoint. It is primarily in reference to chaplains’ skills associated with the battlefield context, although other situations are included, that issues of pastoral ministry are identified and discussed. The Maori chaplains’ task is discussed in reference to the tohunga of pre-Christian times. Unlike their Pakeha (European) associates. Maori chaplains had access to individuals of influence within New Zealand Maori politics, a factor which was of particular significance.

Almost all chaplains had a belief in the natural justice of World War Two and this thesis will suggest they believed that not to have embarked upon war would have led to infinitely more serious problems for both civilization and the Christian Church. Throughout the war years there was an identified and distinct implicit theological framework which underwrote their attitudes and actions. Their opinions, theological framework and ideology, regarding the war arose both from the ministerial duties they performed and their battlefield experience of war itself.

The model of New Zealand chaplaincy is defined and compared with the classical models noted at the beginning of the thesis. At the end of the war, the 2NZEF Chaplains’ Department held a series of Leadership Schools. These Schools, involving laymen of all denominations. addressed a series of transitional religious and social issues, the outcomes of which were to develop over the decades following WW2. The concluding chapter summarizes a Theology of Chaplaincy which has developed from the foregoing study.

text: New Zealand army chaplains at war : 2 NZEF 1939 - 1945 This thesis investigates the motivations to engage in, and the pastoral and sacramental work of, the 1939-45 World War Two chaplains of the Second New Zealand Expeditionary Force, and it explores the theological framework, and theology in which such chaplaincy was carried out. It concludes by noting significant factors and issues of concern to chaplains and their churches in respect of the transition from war to peace.

Historical models of military chaplaincy are found in Constantine’s Roman Empire of 312-337CE, the Christian Crusades of 1096-1291, and the later British Empire. Features of these models provide a tool for understanding and interpreting many aspects of the work and role of the military chaplains of this study. The impact of Christian pacifism is considered, as it is one of the influences which came to bear upon the decision of some clergy who enlisted as chaplains.

Chaplains were recruited from eight denominations and they demonstrated a common pastoral concern for all who were engaged in the various theatres of war. Through the introduction of the concept of ecumenical unit chaplaincy, the battalion became the padre’s parish where he conducted worship, exercised pastoral skills, read the liturgies and preached the Gospel. This became the corner-stone of an ecumenical chaplaincy which developed throughout the war years. Despite the exigencies of war a Bible Class network, church parades - both voluntary and compulsory - and a wide range of religious activities contributed to a spiritual programme which met the needs of a largely nominal Christian 2NZEF.

There emerged from the experience of worship within the 2NZEF a pragmatic ecumenical approach to many aspects of chaplaincy, including in particular the practice, at least for Protestants, of inter-communion. Roman Catholic practice and theological understanding of the Eucharist was enriched by a particular New Zealand contribution. The isolation of the Pacific theatre, coupled with the maturing of the Chaplain’s Department through the Middle East experiences, resulted in a heightening of ecumenical development within the 3rd Division chaplaincy.

The chaplain’s skills in pastoral matters were required to maintain morale, cope with death, wounding and captivity. They are defined first from a military perspective and then examined from a biblical viewpoint. It is primarily in reference to chaplains’ skills associated with the battlefield context, although other situations are included, that issues of pastoral ministry are identified and discussed. The Maori chaplains’ task is discussed in reference to the tohunga of pre-Christian times. Unlike their Pakeha (European) associates. Maori chaplains had access to individuals of influence within New Zealand Maori politics, a factor which was of particular significance.

Almost all chaplains had a belief in the natural justice of World War Two and this thesis will suggest they believed that not to have embarked upon war would have led to infinitely more serious problems for both civilization and the Christian Church. Throughout the war years there was an identified and distinct implicit theological framework which underwrote their attitudes and actions. Their opinions, theological framework and ideology, regarding the war arose both from the ministerial duties they performed and their battlefield experience of war itself.

The model of New Zealand chaplaincy is defined and compared with the classical models noted at the beginning of the thesis. At the end of the war, the 2NZEF Chaplains’ Department held a series of Leadership Schools. These Schools, involving laymen of all denominations. addressed a series of transitional religious and social issues, the outcomes of which were to develop over the decades following WW2. The concluding chapter summarizes a Theology of Chaplaincy which has developed from the foregoing study.

year: 1996